| /* vi: set sw=4 ts=4: */ |
| /* |
| * Small implementation of brctl for busybox. |
| * |
| * Copyright (C) 2008 by Bernhard Reutner-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> |
| |
| #ifndef SIOCBRADDBR |
| # define SIOCBRADDBR BRCTL_ADD_BRIDGE |
| #endif |
| #ifndef SIOCBRDELBR |
| # define SIOCBRDELBR BRCTL_DEL_BRIDGE |
| #endif |
| #ifndef SIOCBRADDIF |
| # define SIOCBRADDIF BRCTL_ADD_IF |
| #endif |
| #ifndef SIOCBRDELIF |
| # define SIOCBRDELIF BRCTL_DEL_IF |
| #endif |
| |
| |
| /* 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 |
| char *endptr; |
| secs = /*bb_*/strtod(time_str, &endptr); |
| if (endptr == time_str) |
| #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 UNUSED_PARAM, char **argv) |
| { |
| static const char keywords[] ALIGN1 = |
| "addbr\0" "delbr\0" "addif\0" "delif\0" |
| IF_FEATURE_BRCTL_FANCY( |
| "stp\0" |
| "setageing\0" "setfd\0" "sethello\0" "setmaxage\0" |
| "setpathcost\0" "setportprio\0" "setbridgeprio\0" |
| ) |
| IF_FEATURE_BRCTL_SHOW("showmacs\0" "show\0"); |
| |
| enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif |
| IF_FEATURE_BRCTL_FANCY(, |
| ARG_stp, |
| ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage, |
| ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio |
| ) |
| IF_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); |
| strncpy_IFNAMSIZ(ifr.ifr_name, brname); |
| |
| 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 'addbr/delbr' need at least two arguments */ |
| bb_show_usage(); |
| |
| strncpy_IFNAMSIZ(ifr.ifr_name, br); |
| 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; |
| } |