| 1 | /* Mode: C;
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| 2 | *
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| 3 | * Mini ifenslave implementation for busybox
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| 4 | * Copyright (C) 2005 by Marc Leeman <marc.leeman@barco.com>
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| 5 | *
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| 6 | * ifenslave.c: Configure network interfaces for parallel routing.
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| 7 | *
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| 8 | * This program controls the Linux implementation of running multiple
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| 9 | * network interfaces in parallel.
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| 10 | *
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| 11 | * Author: Donald Becker <becker@cesdis.gsfc.nasa.gov>
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| 12 | * Copyright 1994-1996 Donald Becker
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| 13 | *
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| 14 | * This program is free software; you can redistribute it
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| 15 | * and/or modify it under the terms of the GNU General Public
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| 16 | * License as published by the Free Software Foundation.
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| 17 | *
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| 18 | * The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
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| 19 | * Center of Excellence in Space Data and Information Sciences
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| 20 | * Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
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| 21 | *
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| 22 | * Changes :
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| 23 | * - 2000/10/02 Willy Tarreau <willy at meta-x.org> :
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| 24 | * - few fixes. Master's MAC address is now correctly taken from
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| 25 | * the first device when not previously set ;
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| 26 | * - detach support : call BOND_RELEASE to detach an enslaved interface.
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| 27 | * - give a mini-howto from command-line help : # ifenslave -h
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| 28 | *
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| 29 | * - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :
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| 30 | * - Master is now brought down before setting the MAC address. In
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| 31 | * the 2.4 kernel you can't change the MAC address while the device is
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| 32 | * up because you get EBUSY.
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| 33 | *
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| 34 | * - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>
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| 35 | * - Added the ability to change the active interface on a mode 1 bond
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| 36 | * at runtime.
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| 37 | *
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| 38 | * - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :
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| 39 | * - No longer set the MAC address of the master. The bond device will
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| 40 | * take care of this itself
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| 41 | * - Try the SIOC*** versions of the bonding ioctls before using the
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| 42 | * old versions
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| 43 | * - 2002/02/18 Erik Habbinga <erik_habbinga @ hp dot com> :
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| 44 | * - ifr2.ifr_flags was not initialized in the hwaddr_notset case,
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| 45 | * SIOCGIFFLAGS now called before hwaddr_notset test
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| 46 | *
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| 47 | * - 2002/10/31 Tony Cureington <tony.cureington * hp_com> :
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| 48 | * - If the master does not have a hardware address when the first slave
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| 49 | * is enslaved, the master is assigned the hardware address of that
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| 50 | * slave - there is a comment in bonding.c stating "ifenslave takes
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| 51 | * care of this now." This corrects the problem of slaves having
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| 52 | * different hardware addresses in active-backup mode when
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| 53 | * multiple interfaces are specified on a single ifenslave command
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| 54 | * (ifenslave bond0 eth0 eth1).
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| 55 | *
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| 56 | * - 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
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| 57 | * Shmulik Hen <shmulik.hen at intel dot com>
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| 58 | * - Moved setting the slave's mac address and openning it, from
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| 59 | * the application to the driver. This enables support of modes
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| 60 | * that need to use the unique mac address of each slave.
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| 61 | * The driver also takes care of closing the slave and restoring its
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| 62 | * original mac address upon release.
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| 63 | * In addition, block possibility of enslaving before the master is up.
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| 64 | * This prevents putting the system in an undefined state.
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| 65 | *
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| 66 | * - 2003/05/01 - Amir Noam <amir.noam at intel dot com>
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| 67 | * - Added ABI version control to restore compatibility between
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| 68 | * new/old ifenslave and new/old bonding.
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| 69 | * - Prevent adding an adapter that is already a slave.
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| 70 | * Fixes the problem of stalling the transmission and leaving
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| 71 | * the slave in a down state.
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| 72 | *
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| 73 | * - 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
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| 74 | * - Prevent enslaving if the bond device is down.
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| 75 | * Fixes the problem of leaving the system in unstable state and
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| 76 | * halting when trying to remove the module.
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| 77 | * - Close socket on all abnormal exists.
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| 78 | * - Add versioning scheme that follows that of the bonding driver.
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| 79 | * current version is 1.0.0 as a base line.
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| 80 | *
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| 81 | * - 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com>
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| 82 | * - ifenslave -c was broken; it's now fixed
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| 83 | * - Fixed problem with routes vanishing from master during enslave
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| 84 | * processing.
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| 85 | *
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| 86 | * - 2003/05/27 - Amir Noam <amir.noam at intel dot com>
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| 87 | * - Fix backward compatibility issues:
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| 88 | * For drivers not using ABI versions, slave was set down while
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| 89 | * it should be left up before enslaving.
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| 90 | * Also, master was not set down and the default set_mac_address()
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| 91 | * would fail and generate an error message in the system log.
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| 92 | * - For opt_c: slave should not be set to the master's setting
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| 93 | * while it is running. It was already set during enslave. To
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| 94 | * simplify things, it is now handeled separately.
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| 95 | *
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| 96 | * - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
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| 97 | * - Code cleanup and style changes
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| 98 | * set version to 1.1.0
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| 99 | */
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| 100 |
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| 101 | #include "libbb.h"
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| 102 |
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| 103 | /* #include <net/if.h> - no. linux/if_bonding.h pulls in linux/if.h */
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| 104 | #include <linux/if.h>
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| 105 | //#include <net/if_arp.h> - not needed?
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| 106 | #include <linux/if_bonding.h>
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| 107 | #include <linux/sockios.h>
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| 108 | #include "fix_u32.h" /* hack, so we may include kernel's ethtool.h */
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| 109 | #include <linux/ethtool.h>
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| 110 | #ifndef BOND_ABI_VERSION
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| 111 | # define BOND_ABI_VERSION 2
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| 112 | #endif
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| 113 | #ifndef IFNAMSIZ
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| 114 | # define IFNAMSIZ 16
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| 115 | #endif
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| 116 |
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| 117 |
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| 118 | struct dev_data {
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| 119 | struct ifreq mtu, flags, hwaddr;
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| 120 | };
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| 121 |
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| 122 |
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| 123 | enum { skfd = 3 }; /* AF_INET socket for ioctl() calls. */
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| 124 | struct globals {
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| 125 | unsigned abi_ver; /* userland - kernel ABI version */
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| 126 | smallint hwaddr_set; /* Master's hwaddr is set */
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| 127 | struct dev_data master;
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| 128 | struct dev_data slave;
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| 129 | };
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| 130 | #define G (*ptr_to_globals)
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| 131 | #define abi_ver (G.abi_ver )
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| 132 | #define hwaddr_set (G.hwaddr_set)
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| 133 | #define master (G.master )
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| 134 | #define slave (G.slave )
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| 135 | #define INIT_G() do { \
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| 136 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 137 | } while (0)
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| 138 |
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| 139 |
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| 140 | /* NOINLINEs are placed where it results in smaller code (gcc 4.3.1) */
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| 141 |
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| 142 | static int ioctl_on_skfd(unsigned request, struct ifreq *ifr)
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| 143 | {
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| 144 | return ioctl(skfd, request, ifr);
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| 145 | }
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| 146 |
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| 147 | static int set_ifrname_and_do_ioctl(unsigned request, struct ifreq *ifr, const char *ifname)
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| 148 | {
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| 149 | strncpy_IFNAMSIZ(ifr->ifr_name, ifname);
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| 150 | return ioctl_on_skfd(request, ifr);
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| 151 | }
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| 152 |
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| 153 | static int get_if_settings(char *ifname, struct dev_data *dd)
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| 154 | {
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| 155 | int res;
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| 156 |
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| 157 | res = set_ifrname_and_do_ioctl(SIOCGIFMTU, &dd->mtu, ifname);
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| 158 | res |= set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &dd->flags, ifname);
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| 159 | res |= set_ifrname_and_do_ioctl(SIOCGIFHWADDR, &dd->hwaddr, ifname);
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| 160 |
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| 161 | return res;
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| 162 | }
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| 163 |
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| 164 | static int get_slave_flags(char *slave_ifname)
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| 165 | {
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| 166 | return set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &slave.flags, slave_ifname);
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| 167 | }
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| 168 |
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| 169 | static int set_hwaddr(char *ifname, struct sockaddr *hwaddr)
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| 170 | {
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| 171 | struct ifreq ifr;
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| 172 |
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| 173 | memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(*hwaddr));
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| 174 | return set_ifrname_and_do_ioctl(SIOCSIFHWADDR, &ifr, ifname);
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| 175 | }
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| 176 |
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| 177 | static int set_mtu(char *ifname, int mtu)
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| 178 | {
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| 179 | struct ifreq ifr;
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| 180 |
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| 181 | ifr.ifr_mtu = mtu;
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| 182 | return set_ifrname_and_do_ioctl(SIOCSIFMTU, &ifr, ifname);
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| 183 | }
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| 184 |
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| 185 | static int set_if_flags(char *ifname, int flags)
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| 186 | {
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| 187 | struct ifreq ifr;
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| 188 |
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| 189 | ifr.ifr_flags = flags;
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| 190 | return set_ifrname_and_do_ioctl(SIOCSIFFLAGS, &ifr, ifname);
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| 191 | }
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| 192 |
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| 193 | static int set_if_up(char *ifname, int flags)
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| 194 | {
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| 195 | int res = set_if_flags(ifname, flags | IFF_UP);
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| 196 | if (res)
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| 197 | bb_perror_msg("%s: can't up", ifname);
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| 198 | return res;
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| 199 | }
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| 200 |
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| 201 | static int set_if_down(char *ifname, int flags)
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| 202 | {
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| 203 | int res = set_if_flags(ifname, flags & ~IFF_UP);
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| 204 | if (res)
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| 205 | bb_perror_msg("%s: can't down", ifname);
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| 206 | return res;
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| 207 | }
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| 208 |
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| 209 | static int clear_if_addr(char *ifname)
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| 210 | {
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| 211 | struct ifreq ifr;
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| 212 |
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| 213 | ifr.ifr_addr.sa_family = AF_INET;
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| 214 | memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
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| 215 | return set_ifrname_and_do_ioctl(SIOCSIFADDR, &ifr, ifname);
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| 216 | }
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| 217 |
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| 218 | static int set_if_addr(char *master_ifname, char *slave_ifname)
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| 219 | {
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| 220 | #if (SIOCGIFADDR | SIOCSIFADDR \
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| 221 | | SIOCGIFDSTADDR | SIOCSIFDSTADDR \
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| 222 | | SIOCGIFBRDADDR | SIOCSIFBRDADDR \
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| 223 | | SIOCGIFNETMASK | SIOCSIFNETMASK) <= 0xffff
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| 224 | #define INT uint16_t
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| 225 | #else
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| 226 | #define INT int
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| 227 | #endif
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| 228 | static const struct {
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| 229 | INT g_ioctl;
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| 230 | INT s_ioctl;
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| 231 | } ifra[] = {
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| 232 | { SIOCGIFADDR, SIOCSIFADDR },
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| 233 | { SIOCGIFDSTADDR, SIOCSIFDSTADDR },
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| 234 | { SIOCGIFBRDADDR, SIOCSIFBRDADDR },
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| 235 | { SIOCGIFNETMASK, SIOCSIFNETMASK },
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| 236 | };
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| 237 |
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| 238 | struct ifreq ifr;
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| 239 | int res;
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| 240 | unsigned i;
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| 241 |
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| 242 | for (i = 0; i < ARRAY_SIZE(ifra); i++) {
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| 243 | res = set_ifrname_and_do_ioctl(ifra[i].g_ioctl, &ifr, master_ifname);
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| 244 | if (res < 0) {
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| 245 | ifr.ifr_addr.sa_family = AF_INET;
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| 246 | memset(ifr.ifr_addr.sa_data, 0,
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| 247 | sizeof(ifr.ifr_addr.sa_data));
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| 248 | }
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| 249 |
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| 250 | res = set_ifrname_and_do_ioctl(ifra[i].s_ioctl, &ifr, slave_ifname);
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| 251 | if (res < 0)
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| 252 | return res;
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| 253 | }
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| 254 |
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| 255 | return 0;
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| 256 | }
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| 257 |
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| 258 | static void change_active(char *master_ifname, char *slave_ifname)
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| 259 | {
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| 260 | struct ifreq ifr;
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| 261 |
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| 262 | if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
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| 263 | bb_error_msg_and_die("%s is not a slave", slave_ifname);
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| 264 | }
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| 265 |
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| 266 | strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
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| 267 | if (set_ifrname_and_do_ioctl(SIOCBONDCHANGEACTIVE, &ifr, master_ifname)
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| 268 | && ioctl_on_skfd(BOND_CHANGE_ACTIVE_OLD, &ifr)
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| 269 | ) {
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| 270 | bb_perror_msg_and_die(
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| 271 | "master %s, slave %s: can't "
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| 272 | "change active",
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| 273 | master_ifname, slave_ifname);
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| 274 | }
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| 275 | }
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| 276 |
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| 277 | static NOINLINE int enslave(char *master_ifname, char *slave_ifname)
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| 278 | {
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| 279 | struct ifreq ifr;
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| 280 | int res;
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| 281 |
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| 282 | if (slave.flags.ifr_flags & IFF_SLAVE) {
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| 283 | bb_error_msg(
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| 284 | "%s is already a slave",
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| 285 | slave_ifname);
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| 286 | return 1;
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| 287 | }
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| 288 |
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| 289 | res = set_if_down(slave_ifname, slave.flags.ifr_flags);
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| 290 | if (res)
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| 291 | return res;
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| 292 |
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| 293 | if (abi_ver < 2) {
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| 294 | /* Older bonding versions would panic if the slave has no IP
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| 295 | * address, so get the IP setting from the master.
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| 296 | */
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| 297 | res = set_if_addr(master_ifname, slave_ifname);
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| 298 | if (res) {
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| 299 | bb_perror_msg("%s: can't set address", slave_ifname);
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| 300 | return res;
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| 301 | }
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| 302 | } else {
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| 303 | res = clear_if_addr(slave_ifname);
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| 304 | if (res) {
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| 305 | bb_perror_msg("%s: can't clear address", slave_ifname);
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| 306 | return res;
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| 307 | }
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| 308 | }
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| 309 |
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| 310 | if (master.mtu.ifr_mtu != slave.mtu.ifr_mtu) {
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| 311 | res = set_mtu(slave_ifname, master.mtu.ifr_mtu);
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| 312 | if (res) {
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| 313 | bb_perror_msg("%s: can't set MTU", slave_ifname);
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| 314 | return res;
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| 315 | }
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| 316 | }
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| 317 |
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| 318 | if (hwaddr_set) {
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| 319 | /* Master already has an hwaddr
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| 320 | * so set it's hwaddr to the slave
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| 321 | */
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| 322 | if (abi_ver < 1) {
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| 323 | /* The driver is using an old ABI, so
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| 324 | * the application sets the slave's
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| 325 | * hwaddr
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| 326 | */
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| 327 | if (set_hwaddr(slave_ifname, &(master.hwaddr.ifr_hwaddr))) {
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| 328 | bb_perror_msg("%s: can't set hw address",
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| 329 | slave_ifname);
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| 330 | goto undo_mtu;
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| 331 | }
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| 332 |
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| 333 | /* For old ABI the application needs to bring the
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| 334 | * slave back up
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| 335 | */
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| 336 | if (set_if_up(slave_ifname, slave.flags.ifr_flags))
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| 337 | goto undo_slave_mac;
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| 338 | }
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| 339 | /* The driver is using a new ABI,
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| 340 | * so the driver takes care of setting
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| 341 | * the slave's hwaddr and bringing
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| 342 | * it up again
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| 343 | */
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| 344 | } else {
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| 345 | /* No hwaddr for master yet, so
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| 346 | * set the slave's hwaddr to it
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| 347 | */
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| 348 | if (abi_ver < 1) {
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| 349 | /* For old ABI, the master needs to be
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| 350 | * down before setting it's hwaddr
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| 351 | */
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| 352 | if (set_if_down(master_ifname, master.flags.ifr_flags))
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| 353 | goto undo_mtu;
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| 354 | }
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| 355 |
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| 356 | if (set_hwaddr(master_ifname, &(slave.hwaddr.ifr_hwaddr))) {
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| 357 | bb_error_msg("%s: can't set hw address",
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| 358 | master_ifname);
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| 359 | goto undo_mtu;
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| 360 | }
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| 361 |
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| 362 | if (abi_ver < 1) {
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| 363 | /* For old ABI, bring the master
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| 364 | * back up
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| 365 | */
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| 366 | if (set_if_up(master_ifname, master.flags.ifr_flags))
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| 367 | goto undo_master_mac;
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| 368 | }
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| 369 |
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| 370 | hwaddr_set = 1;
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| 371 | }
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| 372 |
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| 373 | /* Do the real thing */
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| 374 | strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
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| 375 | if (set_ifrname_and_do_ioctl(SIOCBONDENSLAVE, &ifr, master_ifname)
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| 376 | && ioctl_on_skfd(BOND_ENSLAVE_OLD, &ifr)
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| 377 | ) {
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| 378 | goto undo_master_mac;
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| 379 | }
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| 380 |
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| 381 | return 0;
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| 382 |
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| 383 | /* rollback (best effort) */
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| 384 | undo_master_mac:
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| 385 | set_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr));
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| 386 | hwaddr_set = 0;
|
|---|
| 387 | goto undo_mtu;
|
|---|
| 388 |
|
|---|
| 389 | undo_slave_mac:
|
|---|
| 390 | set_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr));
|
|---|
| 391 | undo_mtu:
|
|---|
| 392 | set_mtu(slave_ifname, slave.mtu.ifr_mtu);
|
|---|
| 393 | return 1;
|
|---|
| 394 | }
|
|---|
| 395 |
|
|---|
| 396 | static int release(char *master_ifname, char *slave_ifname)
|
|---|
| 397 | {
|
|---|
| 398 | struct ifreq ifr;
|
|---|
| 399 | int res = 0;
|
|---|
| 400 |
|
|---|
| 401 | if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
|
|---|
| 402 | bb_error_msg("%s is not a slave", slave_ifname);
|
|---|
| 403 | return 1;
|
|---|
| 404 | }
|
|---|
| 405 |
|
|---|
| 406 | strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
|
|---|
| 407 | if (set_ifrname_and_do_ioctl(SIOCBONDRELEASE, &ifr, master_ifname) < 0
|
|---|
| 408 | && ioctl_on_skfd(BOND_RELEASE_OLD, &ifr) < 0
|
|---|
| 409 | ) {
|
|---|
| 410 | return 1;
|
|---|
| 411 | }
|
|---|
| 412 | if (abi_ver < 1) {
|
|---|
| 413 | /* The driver is using an old ABI, so we'll set the interface
|
|---|
| 414 | * down to avoid any conflicts due to same MAC/IP
|
|---|
| 415 | */
|
|---|
| 416 | res = set_if_down(slave_ifname, slave.flags.ifr_flags);
|
|---|
| 417 | }
|
|---|
| 418 |
|
|---|
| 419 | /* set to default mtu */
|
|---|
| 420 | set_mtu(slave_ifname, 1500);
|
|---|
| 421 |
|
|---|
| 422 | return res;
|
|---|
| 423 | }
|
|---|
| 424 |
|
|---|
| 425 | static NOINLINE void get_drv_info(char *master_ifname)
|
|---|
| 426 | {
|
|---|
| 427 | struct ifreq ifr;
|
|---|
| 428 | struct ethtool_drvinfo info;
|
|---|
| 429 |
|
|---|
| 430 | memset(&ifr, 0, sizeof(ifr));
|
|---|
| 431 | ifr.ifr_data = (caddr_t)&info;
|
|---|
| 432 | info.cmd = ETHTOOL_GDRVINFO;
|
|---|
| 433 | /* both fields are 32 bytes long (long enough) */
|
|---|
| 434 | strcpy(info.driver, "ifenslave");
|
|---|
| 435 | strcpy(info.fw_version, utoa(BOND_ABI_VERSION));
|
|---|
| 436 | if (set_ifrname_and_do_ioctl(SIOCETHTOOL, &ifr, master_ifname) < 0) {
|
|---|
| 437 | if (errno == EOPNOTSUPP)
|
|---|
| 438 | return;
|
|---|
| 439 | bb_perror_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
|
|---|
| 440 | }
|
|---|
| 441 |
|
|---|
| 442 | abi_ver = bb_strtou(info.fw_version, NULL, 0);
|
|---|
| 443 | if (errno)
|
|---|
| 444 | bb_error_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
|
|---|
| 445 | }
|
|---|
| 446 |
|
|---|
| 447 | int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 448 | int ifenslave_main(int argc UNUSED_PARAM, char **argv)
|
|---|
| 449 | {
|
|---|
| 450 | char *master_ifname, *slave_ifname;
|
|---|
| 451 | int rv;
|
|---|
| 452 | int res;
|
|---|
| 453 | unsigned opt;
|
|---|
| 454 | enum {
|
|---|
| 455 | OPT_c = (1 << 0),
|
|---|
| 456 | OPT_d = (1 << 1),
|
|---|
| 457 | OPT_f = (1 << 2),
|
|---|
| 458 | };
|
|---|
| 459 | #if ENABLE_LONG_OPTS
|
|---|
| 460 | static const char ifenslave_longopts[] ALIGN1 =
|
|---|
| 461 | "change-active\0" No_argument "c"
|
|---|
| 462 | "detach\0" No_argument "d"
|
|---|
| 463 | "force\0" No_argument "f"
|
|---|
| 464 | /* "all-interfaces\0" No_argument "a" */
|
|---|
| 465 | ;
|
|---|
| 466 |
|
|---|
| 467 | applet_long_options = ifenslave_longopts;
|
|---|
| 468 | #endif
|
|---|
| 469 | INIT_G();
|
|---|
| 470 |
|
|---|
| 471 | opt = getopt32(argv, "cdfa");
|
|---|
| 472 | argv += optind;
|
|---|
| 473 | if (opt & (opt-1)) /* Only one option can be given */
|
|---|
| 474 | bb_show_usage();
|
|---|
| 475 |
|
|---|
| 476 | master_ifname = *argv++;
|
|---|
| 477 |
|
|---|
| 478 | /* No interface names - show all interfaces. */
|
|---|
| 479 | if (!master_ifname) {
|
|---|
| 480 | display_interfaces(NULL);
|
|---|
| 481 | return EXIT_SUCCESS;
|
|---|
| 482 | }
|
|---|
| 483 |
|
|---|
| 484 | /* Open a basic socket */
|
|---|
| 485 | xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), skfd);
|
|---|
| 486 |
|
|---|
| 487 | /* Exchange abi version with bonding module */
|
|---|
| 488 | get_drv_info(master_ifname);
|
|---|
| 489 |
|
|---|
| 490 | slave_ifname = *argv++;
|
|---|
| 491 | if (!slave_ifname) {
|
|---|
| 492 | if (opt & (OPT_d|OPT_c)) {
|
|---|
| 493 | /* --change or --detach, and no slaves given -
|
|---|
| 494 | * show all interfaces. */
|
|---|
| 495 | display_interfaces(slave_ifname /* == NULL */);
|
|---|
| 496 | return 2; /* why 2? */
|
|---|
| 497 | }
|
|---|
| 498 | /* A single arg means show the
|
|---|
| 499 | * configuration for this interface
|
|---|
| 500 | */
|
|---|
| 501 | display_interfaces(master_ifname);
|
|---|
| 502 | return EXIT_SUCCESS;
|
|---|
| 503 | }
|
|---|
| 504 |
|
|---|
| 505 | if (get_if_settings(master_ifname, &master)) {
|
|---|
| 506 | /* Probably a good reason not to go on */
|
|---|
| 507 | bb_perror_msg_and_die("%s: can't get settings", master_ifname);
|
|---|
| 508 | }
|
|---|
| 509 |
|
|---|
| 510 | /* Check if master is indeed a master;
|
|---|
| 511 | * if not then fail any operation
|
|---|
| 512 | */
|
|---|
| 513 | if (!(master.flags.ifr_flags & IFF_MASTER))
|
|---|
| 514 | bb_error_msg_and_die("%s is not a master", master_ifname);
|
|---|
| 515 |
|
|---|
| 516 | /* Check if master is up; if not then fail any operation */
|
|---|
| 517 | if (!(master.flags.ifr_flags & IFF_UP))
|
|---|
| 518 | bb_error_msg_and_die("%s is not up", master_ifname);
|
|---|
| 519 |
|
|---|
| 520 | #ifdef WHY_BOTHER
|
|---|
| 521 | /* Neither -c[hange] nor -d[etach] -> it's "enslave" then;
|
|---|
| 522 | * and -f[orce] is not there too. Check that it's ethernet. */
|
|---|
| 523 | if (!(opt & (OPT_d|OPT_c|OPT_f)) {
|
|---|
| 524 | /* The family '1' is ARPHRD_ETHER for ethernet. */
|
|---|
| 525 | if (master.hwaddr.ifr_hwaddr.sa_family != 1) {
|
|---|
| 526 | bb_error_msg_and_die(
|
|---|
| 527 | "%s is not ethernet-like (-f overrides)",
|
|---|
| 528 | master_ifname);
|
|---|
| 529 | }
|
|---|
| 530 | }
|
|---|
| 531 | #endif
|
|---|
| 532 |
|
|---|
| 533 | /* Accepts only one slave */
|
|---|
| 534 | if (opt & OPT_c) {
|
|---|
| 535 | /* Change active slave */
|
|---|
| 536 | if (get_slave_flags(slave_ifname)) {
|
|---|
| 537 | bb_perror_msg_and_die(
|
|---|
| 538 | "%s: can't get flags", slave_ifname);
|
|---|
| 539 | }
|
|---|
| 540 | change_active(master_ifname, slave_ifname);
|
|---|
| 541 | return EXIT_SUCCESS;
|
|---|
| 542 | }
|
|---|
| 543 |
|
|---|
| 544 | /* Accepts multiple slaves */
|
|---|
| 545 | res = 0;
|
|---|
| 546 | do {
|
|---|
| 547 | if (opt & OPT_d) {
|
|---|
| 548 | /* Detach a slave interface from the master */
|
|---|
| 549 | rv = get_slave_flags(slave_ifname);
|
|---|
| 550 | if (rv) {
|
|---|
| 551 | /* Can't work with this slave, */
|
|---|
| 552 | /* remember the error and skip it */
|
|---|
| 553 | bb_perror_msg(
|
|---|
| 554 | "skipping %s: can't get flags",
|
|---|
| 555 | slave_ifname);
|
|---|
| 556 | res = rv;
|
|---|
| 557 | continue;
|
|---|
| 558 | }
|
|---|
| 559 | rv = release(master_ifname, slave_ifname);
|
|---|
| 560 | if (rv) {
|
|---|
| 561 | bb_perror_msg("can't release %s from %s",
|
|---|
| 562 | slave_ifname, master_ifname);
|
|---|
| 563 | res = rv;
|
|---|
| 564 | }
|
|---|
| 565 | } else {
|
|---|
| 566 | /* Attach a slave interface to the master */
|
|---|
| 567 | rv = get_if_settings(slave_ifname, &slave);
|
|---|
| 568 | if (rv) {
|
|---|
| 569 | /* Can't work with this slave, */
|
|---|
| 570 | /* remember the error and skip it */
|
|---|
| 571 | bb_perror_msg(
|
|---|
| 572 | "skipping %s: can't get settings",
|
|---|
| 573 | slave_ifname);
|
|---|
| 574 | res = rv;
|
|---|
| 575 | continue;
|
|---|
| 576 | }
|
|---|
| 577 | rv = enslave(master_ifname, slave_ifname);
|
|---|
| 578 | if (rv) {
|
|---|
| 579 | bb_perror_msg("can't enslave %s to %s",
|
|---|
| 580 | slave_ifname, master_ifname);
|
|---|
| 581 | res = rv;
|
|---|
| 582 | }
|
|---|
| 583 | }
|
|---|
| 584 | } while ((slave_ifname = *argv++) != NULL);
|
|---|
| 585 |
|
|---|
| 586 | if (ENABLE_FEATURE_CLEAN_UP) {
|
|---|
| 587 | close(skfd);
|
|---|
| 588 | }
|
|---|
| 589 |
|
|---|
| 590 | return res;
|
|---|
| 591 | }
|
|---|
