[2725] | 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 | #include "libbb.h"
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| 16 | #include <linux/sockios.h>
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| 17 | #include <net/if.h>
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| 18 |
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| 19 | #ifndef SIOCBRADDBR
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| 20 | # define SIOCBRADDBR BRCTL_ADD_BRIDGE
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| 21 | #endif
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| 22 | #ifndef SIOCBRDELBR
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| 23 | # define SIOCBRDELBR BRCTL_DEL_BRIDGE
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| 24 | #endif
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| 25 | #ifndef SIOCBRADDIF
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| 26 | # define SIOCBRADDIF BRCTL_ADD_IF
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| 27 | #endif
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| 28 | #ifndef SIOCBRDELIF
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| 29 | # define SIOCBRDELIF BRCTL_DEL_IF
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| 30 | #endif
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| 31 |
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| 32 |
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| 33 | /* Maximum number of ports supported per bridge interface. */
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| 34 | #ifndef MAX_PORTS
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| 35 | # define MAX_PORTS 32
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| 36 | #endif
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| 37 |
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| 38 | /* Use internal number parsing and not the "exact" conversion. */
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| 39 | /* #define BRCTL_USE_INTERNAL 0 */ /* use exact conversion */
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| 40 | #define BRCTL_USE_INTERNAL 1
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| 41 |
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| 42 | #if ENABLE_FEATURE_BRCTL_FANCY
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| 43 | # include <linux/if_bridge.h>
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| 44 |
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| 45 | /* FIXME: These 4 funcs are not really clean and could be improved */
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| 46 | static ALWAYS_INLINE void strtotimeval(struct timeval *tv,
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| 47 | const char *time_str)
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| 48 | {
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| 49 | double secs;
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| 50 | # if BRCTL_USE_INTERNAL
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| 51 | char *endptr;
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| 52 | secs = /*bb_*/strtod(time_str, &endptr);
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| 53 | if (endptr == time_str)
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| 54 | # else
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| 55 | if (sscanf(time_str, "%lf", &secs) != 1)
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| 56 | # endif
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| 57 | bb_error_msg_and_die(bb_msg_invalid_arg, time_str, "timespec");
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| 58 | tv->tv_sec = secs;
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| 59 | tv->tv_usec = 1000000 * (secs - tv->tv_sec);
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| 60 | }
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| 61 |
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| 62 | static ALWAYS_INLINE unsigned long tv_to_jiffies(const struct timeval *tv)
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| 63 | {
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| 64 | unsigned long long jif;
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| 65 |
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| 66 | jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
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| 67 |
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| 68 | return jif/10000;
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| 69 | }
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| 70 | # if 0
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| 71 | static void jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
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| 72 | {
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| 73 | unsigned long long tvusec;
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| 74 |
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| 75 | tvusec = 10000ULL*jiffies;
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| 76 | tv->tv_sec = tvusec/1000000;
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| 77 | tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
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| 78 | }
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| 79 | # endif
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| 80 | static unsigned long str_to_jiffies(const char *time_str)
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| 81 | {
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| 82 | struct timeval tv;
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| 83 | strtotimeval(&tv, time_str);
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| 84 | return tv_to_jiffies(&tv);
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| 85 | }
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| 86 |
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| 87 | static void arm_ioctl(unsigned long *args,
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| 88 | unsigned long arg0, unsigned long arg1, unsigned long arg2)
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| 89 | {
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| 90 | args[0] = arg0;
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| 91 | args[1] = arg1;
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| 92 | args[2] = arg2;
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| 93 | args[3] = 0;
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| 94 | }
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| 95 | #endif
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| 96 |
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| 97 |
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| 98 | int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 99 | int brctl_main(int argc UNUSED_PARAM, char **argv)
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| 100 | {
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| 101 | static const char keywords[] ALIGN1 =
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| 102 | "addbr\0" "delbr\0" "addif\0" "delif\0"
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| 103 | IF_FEATURE_BRCTL_FANCY(
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| 104 | "stp\0"
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| 105 | "setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
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| 106 | "setpathcost\0" "setportprio\0" "setbridgeprio\0"
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| 107 | )
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| 108 | IF_FEATURE_BRCTL_SHOW("showmacs\0" "show\0");
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| 109 |
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| 110 | enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
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| 111 | IF_FEATURE_BRCTL_FANCY(,
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| 112 | ARG_stp,
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| 113 | ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
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| 114 | ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio
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| 115 | )
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| 116 | IF_FEATURE_BRCTL_SHOW(, ARG_showmacs, ARG_show)
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| 117 | };
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| 118 |
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| 119 | int fd;
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| 120 | smallint key;
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| 121 | struct ifreq ifr;
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| 122 | char *br, *brif;
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| 123 |
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| 124 | argv++;
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| 125 | while (*argv) {
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| 126 | #if ENABLE_FEATURE_BRCTL_FANCY
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| 127 | int ifidx[MAX_PORTS];
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| 128 | unsigned long args[4];
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| 129 | ifr.ifr_data = (char *) &args;
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| 130 | #endif
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| 131 |
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| 132 | key = index_in_strings(keywords, *argv);
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| 133 | if (key == -1) /* no match found in keywords array, bail out. */
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| 134 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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| 135 | argv++;
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| 136 | fd = xsocket(AF_INET, SOCK_STREAM, 0);
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| 137 |
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| 138 | #if ENABLE_FEATURE_BRCTL_SHOW
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| 139 | if (key == ARG_show) { /* show */
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| 140 | char brname[IFNAMSIZ];
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| 141 | int bridx[MAX_PORTS];
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| 142 | int i, num;
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| 143 | arm_ioctl(args, BRCTL_GET_BRIDGES,
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| 144 | (unsigned long) bridx, MAX_PORTS);
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| 145 | num = xioctl(fd, SIOCGIFBR, args);
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| 146 | printf("bridge name\tbridge id\t\tSTP enabled\tinterfaces\n");
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| 147 | for (i = 0; i < num; i++) {
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| 148 | char ifname[IFNAMSIZ];
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| 149 | int j, tabs;
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| 150 | struct __bridge_info bi;
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| 151 | unsigned char *x;
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| 152 |
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| 153 | if (!if_indextoname(bridx[i], brname))
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| 154 | bb_perror_msg_and_die("can't get bridge name for index %d", i);
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| 155 | strncpy_IFNAMSIZ(ifr.ifr_name, brname);
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| 156 |
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| 157 | arm_ioctl(args, BRCTL_GET_BRIDGE_INFO,
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| 158 | (unsigned long) &bi, 0);
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| 159 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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| 160 | printf("%s\t\t", brname);
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| 161 |
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| 162 | /* print bridge id */
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| 163 | x = (unsigned char *) &bi.bridge_id;
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| 164 | for (j = 0; j < 8; j++) {
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| 165 | printf("%.2x", x[j]);
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| 166 | if (j == 1)
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| 167 | bb_putchar('.');
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| 168 | }
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| 169 | printf(bi.stp_enabled ? "\tyes" : "\tno");
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| 170 |
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| 171 | /* print interface list */
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| 172 | arm_ioctl(args, BRCTL_GET_PORT_LIST,
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| 173 | (unsigned long) ifidx, MAX_PORTS);
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| 174 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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| 175 | tabs = 0;
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| 176 | for (j = 0; j < MAX_PORTS; j++) {
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| 177 | if (!ifidx[j])
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| 178 | continue;
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| 179 | if (!if_indextoname(ifidx[j], ifname))
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| 180 | bb_perror_msg_and_die("can't get interface name for index %d", j);
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| 181 | if (tabs)
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| 182 | printf("\t\t\t\t\t");
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| 183 | else
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| 184 | tabs = 1;
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| 185 | printf("\t\t%s\n", ifname);
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| 186 | }
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| 187 | if (!tabs) /* bridge has no interfaces */
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| 188 | bb_putchar('\n');
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| 189 | }
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| 190 | goto done;
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| 191 | }
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| 192 | #endif
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| 193 |
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| 194 | if (!*argv) /* all but 'show' need at least one argument */
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| 195 | bb_show_usage();
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| 196 |
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| 197 | br = *argv++;
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| 198 |
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| 199 | if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
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| 200 | ioctl_or_perror_and_die(fd,
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| 201 | key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
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| 202 | br, "bridge %s", br);
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| 203 | goto done;
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| 204 | }
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| 205 |
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| 206 | if (!*argv) /* all but 'addbr/delbr' need at least two arguments */
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| 207 | bb_show_usage();
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| 208 |
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| 209 | strncpy_IFNAMSIZ(ifr.ifr_name, br);
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| 210 | if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
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| 211 | brif = *argv;
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| 212 | ifr.ifr_ifindex = if_nametoindex(brif);
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| 213 | if (!ifr.ifr_ifindex) {
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| 214 | bb_perror_msg_and_die("iface %s", brif);
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| 215 | }
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| 216 | ioctl_or_perror_and_die(fd,
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| 217 | key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
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| 218 | &ifr, "bridge %s", br);
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| 219 | goto done_next_argv;
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| 220 | }
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| 221 | #if ENABLE_FEATURE_BRCTL_FANCY
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| 222 | if (key == ARG_stp) { /* stp */
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| 223 | static const char no_yes[] ALIGN1 =
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| 224 | "0\0" "off\0" "n\0" "no\0" /* 0 .. 3 */
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| 225 | "1\0" "on\0" "y\0" "yes\0"; /* 4 .. 7 */
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| 226 | int onoff = index_in_strings(no_yes, *argv);
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| 227 | if (onoff < 0)
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| 228 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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| 229 | onoff = (unsigned)onoff / 4;
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| 230 | arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE, onoff, 0);
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| 231 | goto fire;
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| 232 | }
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| 233 | if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */
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| 234 | static const uint8_t ops[] ALIGN1 = {
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| 235 | BRCTL_SET_AGEING_TIME, /* ARG_setageing */
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| 236 | BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */
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| 237 | BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */
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| 238 | BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */
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| 239 | };
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| 240 | arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0);
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| 241 | goto fire;
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| 242 | }
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| 243 | if (key == ARG_setpathcost
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| 244 | || key == ARG_setportprio
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| 245 | || key == ARG_setbridgeprio
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| 246 | ) {
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| 247 | static const uint8_t ops[] ALIGN1 = {
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| 248 | BRCTL_SET_PATH_COST, /* ARG_setpathcost */
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| 249 | BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */
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| 250 | BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */
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| 251 | };
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| 252 | int port = -1;
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| 253 | unsigned arg1, arg2;
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| 254 |
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| 255 | if (key != ARG_setbridgeprio) {
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| 256 | /* get portnum */
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| 257 | unsigned i;
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| 258 |
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| 259 | port = if_nametoindex(*argv++);
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| 260 | if (!port)
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| 261 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port");
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| 262 | memset(ifidx, 0, sizeof ifidx);
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| 263 | arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx,
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| 264 | MAX_PORTS);
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| 265 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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| 266 | for (i = 0; i < MAX_PORTS; i++) {
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| 267 | if (ifidx[i] == port) {
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| 268 | port = i;
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| 269 | break;
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| 270 | }
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| 271 | }
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| 272 | }
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| 273 | arg1 = port;
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| 274 | arg2 = xatoi_positive(*argv);
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| 275 | if (key == ARG_setbridgeprio) {
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| 276 | arg1 = arg2;
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| 277 | arg2 = 0;
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| 278 | }
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| 279 | arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2);
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| 280 | }
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| 281 | fire:
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| 282 | /* Execute the previously set command */
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| 283 | xioctl(fd, SIOCDEVPRIVATE, &ifr);
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| 284 | #endif
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| 285 | done_next_argv:
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| 286 | argv++;
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| 287 | done:
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| 288 | close(fd);
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| 289 | }
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| 290 |
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| 291 | return EXIT_SUCCESS;
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| 292 | }
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