hush/networking/brctl.c
Denis Vlasenko 278a1c2264 brctl: optional support for "show" cmd (by L. Gabriel Somlo <somlo AT cmu.edu>)
function                                             old     new   delta
brctl_main                                           739    1186    +447
if_indextoname                                         -     104    +104
static.keywords                                      827     841     +14
static.ops                                             -       7      +7
packed_usage                                       23978   23976      -2
2008-04-06 07:17:02 +00:00

273 lines
7.0 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Small implementation of brctl for busybox.
*
* Copyright (C) 2008 by Bernhard Fischer
*
* Some helper functions from bridge-utils are
* Copyright (C) 2000 Lennert Buytenhek
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* This applet currently uses only the ioctl interface and no sysfs at all.
* At the time of this writing this was considered a feature.
*/
#include "libbb.h"
#include <linux/sockios.h>
#include <net/if.h>
/* Maximum number of ports supported per bridge interface. */
#ifndef MAX_PORTS
#define MAX_PORTS 32
#endif
/* Use internal number parsing and not the "exact" conversion. */
/* #define BRCTL_USE_INTERNAL 0 */ /* use exact conversion */
#define BRCTL_USE_INTERNAL 1
#if ENABLE_FEATURE_BRCTL_FANCY
#include <linux/if_bridge.h>
/* FIXME: These 4 funcs are not really clean and could be improved */
static ALWAYS_INLINE void strtotimeval(struct timeval *tv,
const char *time_str)
{
double secs;
#if BRCTL_USE_INTERNAL
secs = /*bb_*/strtod(time_str, NULL);
if (!secs)
#else
if (sscanf(time_str, "%lf", &secs) != 1)
#endif
bb_error_msg_and_die (bb_msg_invalid_arg, time_str, "timespec");
tv->tv_sec = secs;
tv->tv_usec = 1000000 * (secs - tv->tv_sec);
}
static ALWAYS_INLINE unsigned long __tv_to_jiffies(const struct timeval *tv)
{
unsigned long long jif;
jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
return jif/10000;
}
# if 0
static void __jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
{
unsigned long long tvusec;
tvusec = 10000ULL*jiffies;
tv->tv_sec = tvusec/1000000;
tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
}
# endif
static unsigned long str_to_jiffies(const char *time_str)
{
struct timeval tv;
strtotimeval(&tv, time_str);
return __tv_to_jiffies(&tv);
}
static void arm_ioctl(unsigned long *args,
unsigned long arg0, unsigned long arg1, unsigned long arg2)
{
args[0] = arg0;
args[1] = arg1;
args[2] = arg2;
args[3] = 0;
}
#endif
int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int brctl_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
static const char keywords[] ALIGN1 =
"addbr\0" "delbr\0" "addif\0" "delif\0"
USE_FEATURE_BRCTL_FANCY(
"stp\0"
"setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
"setpathcost\0" "setportprio\0" "setbridgeprio\0"
)
USE_FEATURE_BRCTL_SHOW("showmacs\0" "show\0");
enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
USE_FEATURE_BRCTL_FANCY(,
ARG_stp,
ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio
)
USE_FEATURE_BRCTL_SHOW(, ARG_showmacs, ARG_show)
};
int fd;
smallint key;
struct ifreq ifr;
char *br, *brif;
argv++;
while (*argv) {
#if ENABLE_FEATURE_BRCTL_FANCY
int ifidx[MAX_PORTS];
unsigned long args[4];
ifr.ifr_data = (char *) &args;
#endif
key = index_in_strings(keywords, *argv);
if (key == -1) /* no match found in keywords array, bail out. */
bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
argv++;
fd = xsocket(AF_INET, SOCK_STREAM, 0);
#if ENABLE_FEATURE_BRCTL_SHOW
if (key == ARG_show) { /* show */
char brname[IFNAMSIZ];
int bridx[MAX_PORTS];
int i, num;
arm_ioctl(args, BRCTL_GET_BRIDGES,
(unsigned long) bridx, MAX_PORTS);
num = xioctl(fd, SIOCGIFBR, args);
printf("bridge name\tbridge id\t\tSTP enabled\tinterfaces\n");
for (i = 0; i < num; i++) {
char ifname[IFNAMSIZ];
int j, tabs;
struct __bridge_info bi;
unsigned char *x;
if (!if_indextoname(bridx[i], brname))
bb_perror_msg_and_die("can't get bridge name for index %d", i);
safe_strncpy(ifr.ifr_name, brname, IFNAMSIZ);
arm_ioctl(args, BRCTL_GET_BRIDGE_INFO,
(unsigned long) &bi, 0);
xioctl(fd, SIOCDEVPRIVATE, &ifr);
printf("%s\t\t", brname);
/* print bridge id */
x = (unsigned char *) &bi.bridge_id;
for (j = 0; j < 8; j++) {
printf("%.2x", x[j]);
if (j == 1)
bb_putchar('.');
}
printf(bi.stp_enabled ? "\tyes" : "\tno");
/* print interface list */
arm_ioctl(args, BRCTL_GET_PORT_LIST,
(unsigned long) ifidx, MAX_PORTS);
xioctl(fd, SIOCDEVPRIVATE, &ifr);
tabs = 0;
for (j = 0; j < MAX_PORTS; j++) {
if (!ifidx[j])
continue;
if (!if_indextoname(ifidx[j], ifname))
bb_perror_msg_and_die("can't get interface name for index %d", j);
if (tabs)
printf("\t\t\t\t\t");
else
tabs = 1;
printf("\t\t%s\n", ifname);
}
if (!tabs) /* bridge has no interfaces */
bb_putchar('\n');
}
goto done;
}
#endif
if (!*argv) /* all but 'show' need at least one argument */
bb_show_usage();
br = *argv++;
if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
ioctl_or_perror_and_die(fd,
key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
br, "bridge %s", br);
goto done;
}
if (!*argv) /* all but 'addif/delif' need at least two arguments */
bb_show_usage();
safe_strncpy(ifr.ifr_name, br, IFNAMSIZ);
if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
brif = *argv;
ifr.ifr_ifindex = if_nametoindex(brif);
if (!ifr.ifr_ifindex) {
bb_perror_msg_and_die("iface %s", brif);
}
ioctl_or_perror_and_die(fd,
key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
&ifr, "bridge %s", br);
goto done_next_argv;
}
#if ENABLE_FEATURE_BRCTL_FANCY
if (key == ARG_stp) { /* stp */
/* FIXME: parsing yes/y/on/1 versus no/n/off/0 is too involved */
arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE,
(unsigned)(**argv - '0'), 0);
goto fire;
}
if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */
static const uint8_t ops[] ALIGN1 = {
BRCTL_SET_AGEING_TIME, /* ARG_setageing */
BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */
BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */
BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */
};
arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0);
goto fire;
}
if (key == ARG_setpathcost
|| key == ARG_setportprio
|| key == ARG_setbridgeprio
) {
static const uint8_t ops[] ALIGN1 = {
BRCTL_SET_PATH_COST, /* ARG_setpathcost */
BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */
BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */
};
int port = -1;
unsigned arg1, arg2;
if (key != ARG_setbridgeprio) {
/* get portnum */
unsigned i;
port = if_nametoindex(*argv++);
if (!port)
bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port");
memset(ifidx, 0, sizeof ifidx);
arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx,
MAX_PORTS);
xioctl(fd, SIOCDEVPRIVATE, &ifr);
for (i = 0; i < MAX_PORTS; i++) {
if (ifidx[i] == port) {
port = i;
break;
}
}
}
arg1 = port;
arg2 = xatoi_u(*argv);
if (key == ARG_setbridgeprio) {
arg1 = arg2;
arg2 = 0;
}
arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2);
}
fire:
/* Execute the previously set command */
xioctl(fd, SIOCDEVPRIVATE, &ifr);
#endif
done_next_argv:
argv++;
done:
close(fd);
}
return EXIT_SUCCESS;
}