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/* vi: set sw=4 ts=4: */
/*
* Small implementation of brctl for busybox.
*
* Copyright (C) 2008 by Bernhard Fischer
*
* 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>
#ifdef ENABLE_FEATURE_BRCTL_SHOW
#error Remove these
#endif
#define ENABLE_FEATURE_BRCTL_SHOW 0
#define USE_FEATURE_BRCTL_SHOW(...)
#if 0
#define ENABLE_FEATURE_BRCTL_FANCY 0
#if ENABLE_FEATURE_BRCTL_FANCY
#define USE_FEATURE_BRCTL_FANCY(...) __VA_ARGS__
#else
#define USE_FEATURE_BRCTL_FANCY(...)
#endif
#endif
#if ENABLE_FEATURE_BRCTL_FANCY
#include <linux/if_bridge.h>
/* FIXME: These 4 funcs are not really clean and could be improved */
static inline ALWAYS_INLINE void strtotimeval(struct timeval *tv,
const char *time_str)
{
double secs;
if (sscanf(time_str, "%lf", &secs) != 1)
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 inline 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;
}
# ifdef UNUSED && 00
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);
}
#endif
int brctl_main(int argc ATTRIBUTE_UNUSED, char **argv) MAIN_EXTERNALLY_VISIBLE;
int brctl_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
int fd;
static const char keywords[] ALIGN1 =
"addbr\0" "delbr\0" "addif\0" "delif\0"
USE_FEATURE_BRCTL_FANCY(
"setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
"setpathcost\0" "setportprio\0" "setbridgeprio\0"
"stp\0"
)
USE_FEATURE_BRCTL_SHOW("showmacs\0" "show\0");
enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
USE_FEATURE_BRCTL_FANCY(,
ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio,
ARG_stp
)
USE_FEATURE_BRCTL_SHOW(, ARG_showmacs, ARG_show) };
smallint key;
struct ifreq ifr;
static char info[] = "bridge %s\0 iface %s";
char *br;
argv++;
while (*argv) {
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++;
#if ENABLE_FEATURE_BRCTL_SHOW
if (key == ARG_show) { /* show */
goto out; /* FIXME: implement me! :) */
}
#endif
fd = xsocket(AF_INET, SOCK_STREAM, 0);
br = *(argv++);
if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
ioctl_or_perror_and_die(fd,
key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
br, info, br);
goto done;
}
if (!*argv) /* all but 'show' need at least one argument */
bb_show_usage();
safe_strncpy(ifr.ifr_name, br, IFNAMSIZ);
if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
char *brif;
brif = *(argv++);
if (!(ifr.ifr_ifindex = if_nametoindex(brif))) {
bb_perror_msg_and_die(info+11, brif);
}
ioctl_or_perror_and_die(fd,
key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
&ifr, info, br);
}
#if ENABLE_FEATURE_BRCTL_FANCY
if (key - ARG_delif < 5) { /* time related ops */
unsigned long op = (key == ARG_setageing) ? BRCTL_SET_AGEING_TIME :
(key == ARG_setfd) ? BRCTL_SET_BRIDGE_FORWARD_DELAY:
(key == ARG_sethello) ? BRCTL_SET_BRIDGE_HELLO_TIME:
(key == ARG_setmaxage) ? BRCTL_SET_BRIDGE_MAX_AGE :
-1/*will never be used */;
unsigned long jiff = str_to_jiffies (*(argv++));
unsigned long args[4] = {op, jiff, 0, 0};
ifr.ifr_data = (char *) &args;
xioctl(fd, SIOCDEVPRIVATE, &ifr);
}
#endif
done:
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
}
out:
return EXIT_SUCCESS;
}
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