397 lines
11 KiB
C
397 lines
11 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Small implementation of brctl for busybox.
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*
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* Copyright (C) 2008 by Bernhard Reutner-Fischer
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*
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* Some helper functions from bridge-utils are
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* Copyright (C) 2000 Lennert Buytenhek
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* This applet currently uses only the ioctl interface and no sysfs at all.
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* At the time of this writing this was considered a feature.
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*/
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//config:config BRCTL
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//config: bool "brctl"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: Manage ethernet bridges.
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//config: Supports addbr/delbr and addif/delif.
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//config:
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//config:config FEATURE_BRCTL_FANCY
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//config: bool "Fancy options"
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//config: default y
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//config: depends on BRCTL
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//config: help
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//config: Add support for extended option like:
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//config: setageing, setfd, sethello, setmaxage,
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//config: setpathcost, setportprio, setbridgeprio,
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//config: stp
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//config: This adds about 600 bytes.
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//config:
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//config:config FEATURE_BRCTL_SHOW
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//config: bool "Support show"
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//config: default y
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//config: depends on BRCTL && FEATURE_BRCTL_FANCY
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//config: help
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//config: Add support for option which prints the current config:
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//config: show
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//applet:IF_BRCTL(APPLET(brctl, BB_DIR_USR_SBIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_BRCTL) += brctl.o
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//usage:#define brctl_trivial_usage
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//usage: "COMMAND [BRIDGE [INTERFACE]]"
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//usage:#define brctl_full_usage "\n\n"
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//usage: "Manage ethernet bridges\n"
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//usage: "\nCommands:"
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//usage: IF_FEATURE_BRCTL_SHOW(
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//usage: "\n show Show a list of bridges"
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//usage: )
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//usage: "\n addbr BRIDGE Create BRIDGE"
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//usage: "\n delbr BRIDGE Delete BRIDGE"
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//usage: "\n addif BRIDGE IFACE Add IFACE to BRIDGE"
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//usage: "\n delif BRIDGE IFACE Delete IFACE from BRIDGE"
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//usage: IF_FEATURE_BRCTL_FANCY(
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//usage: "\n setageing BRIDGE TIME Set ageing time"
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//usage: "\n setfd BRIDGE TIME Set bridge forward delay"
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//usage: "\n sethello BRIDGE TIME Set hello time"
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//usage: "\n setmaxage BRIDGE TIME Set max message age"
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//usage: "\n setpathcost BRIDGE COST Set path cost"
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//usage: "\n setportprio BRIDGE PRIO Set port priority"
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//usage: "\n setbridgeprio BRIDGE PRIO Set bridge priority"
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//usage: "\n stp BRIDGE [1/yes/on|0/no/off] STP on/off"
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//usage: )
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#include "libbb.h"
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#include <linux/sockios.h>
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#include <net/if.h>
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#ifndef SIOCBRADDBR
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# define SIOCBRADDBR BRCTL_ADD_BRIDGE
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#endif
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#ifndef SIOCBRDELBR
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# define SIOCBRDELBR BRCTL_DEL_BRIDGE
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#endif
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#ifndef SIOCBRADDIF
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# define SIOCBRADDIF BRCTL_ADD_IF
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#endif
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#ifndef SIOCBRDELIF
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# define SIOCBRDELIF BRCTL_DEL_IF
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#endif
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/* Maximum number of ports supported per bridge interface. */
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#ifndef MAX_PORTS
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# define MAX_PORTS 32
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#endif
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/* Use internal number parsing and not the "exact" conversion. */
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/* #define BRCTL_USE_INTERNAL 0 */ /* use exact conversion */
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#define BRCTL_USE_INTERNAL 1
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#if ENABLE_FEATURE_BRCTL_FANCY
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/* #include <linux/if_bridge.h>
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* breaks on musl: we already included netinet/in.h in libbb.h,
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* if we include <linux/if_bridge.h> here, we get this:
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* In file included from /usr/include/linux/if_bridge.h:18,
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* from networking/brctl.c:67:
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* /usr/include/linux/in6.h:32: error: redefinition of 'struct in6_addr'
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* /usr/include/linux/in6.h:49: error: redefinition of 'struct sockaddr_in6'
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* /usr/include/linux/in6.h:59: error: redefinition of 'struct ipv6_mreq'
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*/
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/* From <linux/if_bridge.h> */
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#define BRCTL_GET_VERSION 0
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#define BRCTL_GET_BRIDGES 1
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#define BRCTL_ADD_BRIDGE 2
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#define BRCTL_DEL_BRIDGE 3
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#define BRCTL_ADD_IF 4
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#define BRCTL_DEL_IF 5
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#define BRCTL_GET_BRIDGE_INFO 6
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#define BRCTL_GET_PORT_LIST 7
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#define BRCTL_SET_BRIDGE_FORWARD_DELAY 8
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#define BRCTL_SET_BRIDGE_HELLO_TIME 9
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#define BRCTL_SET_BRIDGE_MAX_AGE 10
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#define BRCTL_SET_AGEING_TIME 11
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#define BRCTL_SET_GC_INTERVAL 12
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#define BRCTL_GET_PORT_INFO 13
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#define BRCTL_SET_BRIDGE_STP_STATE 14
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#define BRCTL_SET_BRIDGE_PRIORITY 15
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#define BRCTL_SET_PORT_PRIORITY 16
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#define BRCTL_SET_PATH_COST 17
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#define BRCTL_GET_FDB_ENTRIES 18
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struct __bridge_info {
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uint64_t designated_root;
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uint64_t bridge_id;
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uint32_t root_path_cost;
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uint32_t max_age;
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uint32_t hello_time;
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uint32_t forward_delay;
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uint32_t bridge_max_age;
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uint32_t bridge_hello_time;
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uint32_t bridge_forward_delay;
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uint8_t topology_change;
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uint8_t topology_change_detected;
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uint8_t root_port;
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uint8_t stp_enabled;
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uint32_t ageing_time;
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uint32_t gc_interval;
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uint32_t hello_timer_value;
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uint32_t tcn_timer_value;
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uint32_t topology_change_timer_value;
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uint32_t gc_timer_value;
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};
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/* end <linux/if_bridge.h> */
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/* FIXME: These 4 funcs are not really clean and could be improved */
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static ALWAYS_INLINE void bb_strtotimeval(struct timeval *tv,
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const char *time_str)
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{
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double secs;
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# if BRCTL_USE_INTERNAL
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char *endptr;
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secs = /*bb_*/strtod(time_str, &endptr);
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if (endptr == time_str)
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# else
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if (sscanf(time_str, "%lf", &secs) != 1)
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# endif
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bb_error_msg_and_die(bb_msg_invalid_arg_to, time_str, "timespec");
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tv->tv_sec = secs;
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tv->tv_usec = 1000000 * (secs - tv->tv_sec);
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}
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static ALWAYS_INLINE unsigned long tv_to_jiffies(const struct timeval *tv)
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{
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unsigned long long jif;
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jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
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return jif/10000;
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}
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# if 0
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static void jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
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{
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unsigned long long tvusec;
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tvusec = 10000ULL*jiffies;
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tv->tv_sec = tvusec/1000000;
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tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
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}
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# endif
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static unsigned long str_to_jiffies(const char *time_str)
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{
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struct timeval tv;
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bb_strtotimeval(&tv, time_str);
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return tv_to_jiffies(&tv);
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}
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static void arm_ioctl(unsigned long *args,
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unsigned long arg0, unsigned long arg1, unsigned long arg2)
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{
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args[0] = arg0;
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args[1] = arg1;
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args[2] = arg2;
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args[3] = 0;
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}
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#endif
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int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int brctl_main(int argc UNUSED_PARAM, char **argv)
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{
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static const char keywords[] ALIGN1 =
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"addbr\0" "delbr\0" "addif\0" "delif\0"
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IF_FEATURE_BRCTL_FANCY(
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"stp\0"
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"setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
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"setpathcost\0" "setportprio\0" "setbridgeprio\0"
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)
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IF_FEATURE_BRCTL_SHOW("show\0");
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enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
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IF_FEATURE_BRCTL_FANCY(,
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ARG_stp,
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ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
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ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio
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)
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IF_FEATURE_BRCTL_SHOW(, ARG_show)
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};
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int fd;
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smallint key;
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struct ifreq ifr;
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char *br, *brif;
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argv++;
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while (*argv) {
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#if ENABLE_FEATURE_BRCTL_FANCY
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int ifidx[MAX_PORTS];
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unsigned long args[4];
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ifr.ifr_data = (char *) &args;
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#endif
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key = index_in_strings(keywords, *argv);
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if (key == -1) /* no match found in keywords array, bail out. */
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bb_error_msg_and_die(bb_msg_invalid_arg_to, *argv, applet_name);
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argv++;
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fd = xsocket(AF_INET, SOCK_STREAM, 0);
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#if ENABLE_FEATURE_BRCTL_SHOW
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if (key == ARG_show) { /* show */
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char brname[IFNAMSIZ];
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int bridx[MAX_PORTS];
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int i, num;
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arm_ioctl(args, BRCTL_GET_BRIDGES,
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(unsigned long) bridx, MAX_PORTS);
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num = xioctl(fd, SIOCGIFBR, args);
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puts("bridge name\tbridge id\t\tSTP enabled\tinterfaces");
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for (i = 0; i < num; i++) {
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char ifname[IFNAMSIZ];
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int j, tabs;
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struct __bridge_info bi;
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unsigned char *x;
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if (!if_indextoname(bridx[i], brname))
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bb_perror_msg_and_die("can't get bridge name for index %d", i);
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strncpy_IFNAMSIZ(ifr.ifr_name, brname);
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arm_ioctl(args, BRCTL_GET_BRIDGE_INFO,
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(unsigned long) &bi, 0);
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xioctl(fd, SIOCDEVPRIVATE, &ifr);
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printf("%s\t\t", brname);
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/* print bridge id */
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x = (unsigned char *) &bi.bridge_id;
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for (j = 0; j < 8; j++) {
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printf("%02x", x[j]);
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if (j == 1)
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bb_putchar('.');
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}
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printf(bi.stp_enabled ? "\tyes" : "\tno");
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/* print interface list */
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arm_ioctl(args, BRCTL_GET_PORT_LIST,
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(unsigned long) ifidx, MAX_PORTS);
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xioctl(fd, SIOCDEVPRIVATE, &ifr);
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tabs = 0;
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for (j = 0; j < MAX_PORTS; j++) {
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if (!ifidx[j])
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continue;
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if (!if_indextoname(ifidx[j], ifname))
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bb_perror_msg_and_die("can't get interface name for index %d", j);
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if (tabs)
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printf("\t\t\t\t\t");
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else
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tabs = 1;
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printf("\t\t%s\n", ifname);
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}
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if (!tabs) /* bridge has no interfaces */
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bb_putchar('\n');
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}
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goto done;
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}
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#endif
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if (!*argv) /* all but 'show' need at least one argument */
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bb_show_usage();
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br = *argv++;
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if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
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ioctl_or_perror_and_die(fd,
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key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
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br, "bridge %s", br);
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goto done;
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}
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if (!*argv) /* all but 'addbr/delbr' need at least two arguments */
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bb_show_usage();
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strncpy_IFNAMSIZ(ifr.ifr_name, br);
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if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
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brif = *argv;
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ifr.ifr_ifindex = if_nametoindex(brif);
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if (!ifr.ifr_ifindex) {
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bb_perror_msg_and_die("iface %s", brif);
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}
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ioctl_or_perror_and_die(fd,
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key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
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&ifr, "bridge %s", br);
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goto done_next_argv;
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}
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#if ENABLE_FEATURE_BRCTL_FANCY
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if (key == ARG_stp) { /* stp */
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static const char no_yes[] ALIGN1 =
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"0\0" "off\0" "n\0" "no\0" /* 0 .. 3 */
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"1\0" "on\0" "y\0" "yes\0"; /* 4 .. 7 */
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int onoff = index_in_strings(no_yes, *argv);
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if (onoff < 0)
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bb_error_msg_and_die(bb_msg_invalid_arg_to, *argv, applet_name);
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onoff = (unsigned)onoff / 4;
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arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE, onoff, 0);
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goto fire;
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}
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if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */
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static const uint8_t ops[] ALIGN1 = {
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BRCTL_SET_AGEING_TIME, /* ARG_setageing */
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BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */
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BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */
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BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */
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};
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arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0);
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goto fire;
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}
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if (key == ARG_setpathcost
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|| key == ARG_setportprio
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|| key == ARG_setbridgeprio
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) {
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static const uint8_t ops[] ALIGN1 = {
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BRCTL_SET_PATH_COST, /* ARG_setpathcost */
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BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */
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BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */
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};
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int port = -1;
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unsigned arg1, arg2;
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if (key != ARG_setbridgeprio) {
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/* get portnum */
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unsigned i;
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port = if_nametoindex(*argv++);
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if (!port)
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bb_error_msg_and_die(bb_msg_invalid_arg_to, *argv, "port");
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memset(ifidx, 0, sizeof ifidx);
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arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx,
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MAX_PORTS);
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xioctl(fd, SIOCDEVPRIVATE, &ifr);
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for (i = 0; i < MAX_PORTS; i++) {
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if (ifidx[i] == port) {
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port = i;
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break;
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}
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}
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}
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arg1 = port;
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arg2 = xatoi_positive(*argv);
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if (key == ARG_setbridgeprio) {
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arg1 = arg2;
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arg2 = 0;
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}
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arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2);
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}
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fire:
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/* Execute the previously set command */
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xioctl(fd, SIOCDEVPRIVATE, &ifr);
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#endif
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done_next_argv:
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argv++;
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done:
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close(fd);
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}
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return EXIT_SUCCESS;
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}
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