| /* Mode: C; |
| * |
| * Mini ifenslave implementation for busybox |
| * Copyright (C) 2005 by Marc Leeman <marc.leeman@barco.com> |
| * |
| * ifenslave.c: Configure network interfaces for parallel routing. |
| * |
| * This program controls the Linux implementation of running multiple |
| * network interfaces in parallel. |
| * |
| * Author: Donald Becker <becker@cesdis.gsfc.nasa.gov> |
| * Copyright 1994-1996 Donald Becker |
| * |
| * This program is free software; you can redistribute it |
| * and/or modify it under the terms of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O |
| * Center of Excellence in Space Data and Information Sciences |
| * Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771 |
| * |
| * Changes : |
| * - 2000/10/02 Willy Tarreau <willy at meta-x.org> : |
| * - few fixes. Master's MAC address is now correctly taken from |
| * the first device when not previously set ; |
| * - detach support : call BOND_RELEASE to detach an enslaved interface. |
| * - give a mini-howto from command-line help : # ifenslave -h |
| * |
| * - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> : |
| * - Master is now brought down before setting the MAC address. In |
| * the 2.4 kernel you can't change the MAC address while the device is |
| * up because you get EBUSY. |
| * |
| * - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com> |
| * - Added the ability to change the active interface on a mode 1 bond |
| * at runtime. |
| * |
| * - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> : |
| * - No longer set the MAC address of the master. The bond device will |
| * take care of this itself |
| * - Try the SIOC*** versions of the bonding ioctls before using the |
| * old versions |
| * - 2002/02/18 Erik Habbinga <erik_habbinga @ hp dot com> : |
| * - ifr2.ifr_flags was not initialized in the hwaddr_notset case, |
| * SIOCGIFFLAGS now called before hwaddr_notset test |
| * |
| * - 2002/10/31 Tony Cureington <tony.cureington * hp_com> : |
| * - If the master does not have a hardware address when the first slave |
| * is enslaved, the master is assigned the hardware address of that |
| * slave - there is a comment in bonding.c stating "ifenslave takes |
| * care of this now." This corrects the problem of slaves having |
| * different hardware addresses in active-backup mode when |
| * multiple interfaces are specified on a single ifenslave command |
| * (ifenslave bond0 eth0 eth1). |
| * |
| * - 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and |
| * Shmulik Hen <shmulik.hen at intel dot com> |
| * - Moved setting the slave's mac address and openning it, from |
| * the application to the driver. This enables support of modes |
| * that need to use the unique mac address of each slave. |
| * The driver also takes care of closing the slave and restoring its |
| * original mac address upon release. |
| * In addition, block possibility of enslaving before the master is up. |
| * This prevents putting the system in an undefined state. |
| * |
| * - 2003/05/01 - Amir Noam <amir.noam at intel dot com> |
| * - Added ABI version control to restore compatibility between |
| * new/old ifenslave and new/old bonding. |
| * - Prevent adding an adapter that is already a slave. |
| * Fixes the problem of stalling the transmission and leaving |
| * the slave in a down state. |
| * |
| * - 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com> |
| * - Prevent enslaving if the bond device is down. |
| * Fixes the problem of leaving the system in unstable state and |
| * halting when trying to remove the module. |
| * - Close socket on all abnormal exists. |
| * - Add versioning scheme that follows that of the bonding driver. |
| * current version is 1.0.0 as a base line. |
| * |
| * - 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com> |
| * - ifenslave -c was broken; it's now fixed |
| * - Fixed problem with routes vanishing from master during enslave |
| * processing. |
| * |
| * - 2003/05/27 - Amir Noam <amir.noam at intel dot com> |
| * - Fix backward compatibility issues: |
| * For drivers not using ABI versions, slave was set down while |
| * it should be left up before enslaving. |
| * Also, master was not set down and the default set_mac_address() |
| * would fail and generate an error message in the system log. |
| * - For opt_c: slave should not be set to the master's setting |
| * while it is running. It was already set during enslave. To |
| * simplify things, it is now handeled separately. |
| * |
| * - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com> |
| * - Code cleanup and style changes |
| * set version to 1.1.0 |
| */ |
| |
| #include "libbb.h" |
| |
| /* #include <net/if.h> - no. linux/if_bonding.h pulls in linux/if.h */ |
| #include <net/if_arp.h> |
| #include <linux/if_bonding.h> |
| #include <linux/sockios.h> |
| |
| #include "fix_u32.h" /* hack, so we may include kernel's ethtool.h */ |
| #include <linux/ethtool.h> |
| |
| #ifndef IFNAMSIZ |
| # define IFNAMSIZ 16 |
| #endif |
| |
| |
| struct dev_data { |
| struct ifreq mtu, flags, hwaddr; |
| }; |
| |
| |
| enum { skfd = 3 }; /* AF_INET socket for ioctl() calls. */ |
| struct globals { |
| unsigned abi_ver; /* userland - kernel ABI version */ |
| smallint hwaddr_set; /* Master's hwaddr is set */ |
| struct dev_data master; |
| struct dev_data slave; |
| }; |
| #define G (*ptr_to_globals) |
| #define abi_ver (G.abi_ver ) |
| #define hwaddr_set (G.hwaddr_set) |
| #define master (G.master ) |
| #define slave (G.slave ) |
| #define INIT_G() do { \ |
| SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
| } while (0) |
| |
| |
| /* NOINLINEs are placed where it results in smaller code (gcc 4.3.1) */ |
| |
| static int ioctl_on_skfd(unsigned request, struct ifreq *ifr) |
| { |
| return ioctl(skfd, request, ifr); |
| } |
| |
| static int set_ifrname_and_do_ioctl(unsigned request, struct ifreq *ifr, const char *ifname) |
| { |
| strncpy_IFNAMSIZ(ifr->ifr_name, ifname); |
| return ioctl_on_skfd(request, ifr); |
| } |
| |
| static int get_if_settings(char *ifname, struct dev_data *dd) |
| { |
| int res; |
| |
| res = set_ifrname_and_do_ioctl(SIOCGIFMTU, &dd->mtu, ifname); |
| res |= set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &dd->flags, ifname); |
| res |= set_ifrname_and_do_ioctl(SIOCGIFHWADDR, &dd->hwaddr, ifname); |
| |
| return res; |
| } |
| |
| static int get_slave_flags(char *slave_ifname) |
| { |
| return set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &slave.flags, slave_ifname); |
| } |
| |
| static int set_hwaddr(char *ifname, struct sockaddr *hwaddr) |
| { |
| struct ifreq ifr; |
| |
| memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(*hwaddr)); |
| return set_ifrname_and_do_ioctl(SIOCSIFHWADDR, &ifr, ifname); |
| } |
| |
| static int set_mtu(char *ifname, int mtu) |
| { |
| struct ifreq ifr; |
| |
| ifr.ifr_mtu = mtu; |
| return set_ifrname_and_do_ioctl(SIOCSIFMTU, &ifr, ifname); |
| } |
| |
| static int set_if_flags(char *ifname, int flags) |
| { |
| struct ifreq ifr; |
| |
| ifr.ifr_flags = flags; |
| return set_ifrname_and_do_ioctl(SIOCSIFFLAGS, &ifr, ifname); |
| } |
| |
| static int set_if_up(char *ifname, int flags) |
| { |
| int res = set_if_flags(ifname, flags | IFF_UP); |
| if (res) |
| bb_perror_msg("%s: can't up", ifname); |
| return res; |
| } |
| |
| static int set_if_down(char *ifname, int flags) |
| { |
| int res = set_if_flags(ifname, flags & ~IFF_UP); |
| if (res) |
| bb_perror_msg("%s: can't down", ifname); |
| return res; |
| } |
| |
| static int clear_if_addr(char *ifname) |
| { |
| struct ifreq ifr; |
| |
| ifr.ifr_addr.sa_family = AF_INET; |
| memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data)); |
| return set_ifrname_and_do_ioctl(SIOCSIFADDR, &ifr, ifname); |
| } |
| |
| static int set_if_addr(char *master_ifname, char *slave_ifname) |
| { |
| #if (SIOCGIFADDR | SIOCSIFADDR \ |
| | SIOCGIFDSTADDR | SIOCSIFDSTADDR \ |
| | SIOCGIFBRDADDR | SIOCSIFBRDADDR \ |
| | SIOCGIFNETMASK | SIOCSIFNETMASK) <= 0xffff |
| #define INT uint16_t |
| #else |
| #define INT int |
| #endif |
| static const struct { |
| INT g_ioctl; |
| INT s_ioctl; |
| } ifra[] = { |
| { SIOCGIFADDR, SIOCSIFADDR }, |
| { SIOCGIFDSTADDR, SIOCSIFDSTADDR }, |
| { SIOCGIFBRDADDR, SIOCSIFBRDADDR }, |
| { SIOCGIFNETMASK, SIOCSIFNETMASK }, |
| }; |
| |
| struct ifreq ifr; |
| int res; |
| unsigned i; |
| |
| for (i = 0; i < ARRAY_SIZE(ifra); i++) { |
| res = set_ifrname_and_do_ioctl(ifra[i].g_ioctl, &ifr, master_ifname); |
| if (res < 0) { |
| ifr.ifr_addr.sa_family = AF_INET; |
| memset(ifr.ifr_addr.sa_data, 0, |
| sizeof(ifr.ifr_addr.sa_data)); |
| } |
| |
| res = set_ifrname_and_do_ioctl(ifra[i].s_ioctl, &ifr, slave_ifname); |
| if (res < 0) |
| return res; |
| } |
| |
| return 0; |
| } |
| |
| static void change_active(char *master_ifname, char *slave_ifname) |
| { |
| struct ifreq ifr; |
| |
| if (!(slave.flags.ifr_flags & IFF_SLAVE)) { |
| bb_error_msg_and_die("%s is not a slave", slave_ifname); |
| } |
| |
| strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); |
| if (set_ifrname_and_do_ioctl(SIOCBONDCHANGEACTIVE, &ifr, master_ifname) |
| && ioctl_on_skfd(BOND_CHANGE_ACTIVE_OLD, &ifr) |
| ) { |
| bb_perror_msg_and_die( |
| "master %s, slave %s: can't " |
| "change active", |
| master_ifname, slave_ifname); |
| } |
| } |
| |
| static NOINLINE int enslave(char *master_ifname, char *slave_ifname) |
| { |
| struct ifreq ifr; |
| int res; |
| |
| if (slave.flags.ifr_flags & IFF_SLAVE) { |
| bb_error_msg( |
| "%s is already a slave", |
| slave_ifname); |
| return 1; |
| } |
| |
| res = set_if_down(slave_ifname, slave.flags.ifr_flags); |
| if (res) |
| return res; |
| |
| if (abi_ver < 2) { |
| /* Older bonding versions would panic if the slave has no IP |
| * address, so get the IP setting from the master. |
| */ |
| res = set_if_addr(master_ifname, slave_ifname); |
| if (res) { |
| bb_perror_msg("%s: can't set address", slave_ifname); |
| return res; |
| } |
| } else { |
| res = clear_if_addr(slave_ifname); |
| if (res) { |
| bb_perror_msg("%s: can't clear address", slave_ifname); |
| return res; |
| } |
| } |
| |
| if (master.mtu.ifr_mtu != slave.mtu.ifr_mtu) { |
| res = set_mtu(slave_ifname, master.mtu.ifr_mtu); |
| if (res) { |
| bb_perror_msg("%s: can't set MTU", slave_ifname); |
| return res; |
| } |
| } |
| |
| if (hwaddr_set) { |
| /* Master already has an hwaddr |
| * so set it's hwaddr to the slave |
| */ |
| if (abi_ver < 1) { |
| /* The driver is using an old ABI, so |
| * the application sets the slave's |
| * hwaddr |
| */ |
| if (set_hwaddr(slave_ifname, &(master.hwaddr.ifr_hwaddr))) { |
| bb_perror_msg("%s: can't set hw address", |
| slave_ifname); |
| goto undo_mtu; |
| } |
| |
| /* For old ABI the application needs to bring the |
| * slave back up |
| */ |
| if (set_if_up(slave_ifname, slave.flags.ifr_flags)) |
| goto undo_slave_mac; |
| } |
| /* The driver is using a new ABI, |
| * so the driver takes care of setting |
| * the slave's hwaddr and bringing |
| * it up again |
| */ |
| } else { |
| /* No hwaddr for master yet, so |
| * set the slave's hwaddr to it |
| */ |
| if (abi_ver < 1) { |
| /* For old ABI, the master needs to be |
| * down before setting it's hwaddr |
| */ |
| if (set_if_down(master_ifname, master.flags.ifr_flags)) |
| goto undo_mtu; |
| } |
| |
| if (set_hwaddr(master_ifname, &(slave.hwaddr.ifr_hwaddr))) { |
| bb_error_msg("%s: can't set hw address", |
| master_ifname); |
| goto undo_mtu; |
| } |
| |
| if (abi_ver < 1) { |
| /* For old ABI, bring the master |
| * back up |
| */ |
| if (set_if_up(master_ifname, master.flags.ifr_flags)) |
| goto undo_master_mac; |
| } |
| |
| hwaddr_set = 1; |
| } |
| |
| /* Do the real thing */ |
| strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); |
| if (set_ifrname_and_do_ioctl(SIOCBONDENSLAVE, &ifr, master_ifname) |
| && ioctl_on_skfd(BOND_ENSLAVE_OLD, &ifr) |
| ) { |
| goto undo_master_mac; |
| } |
| |
| return 0; |
| |
| /* rollback (best effort) */ |
| undo_master_mac: |
| set_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr)); |
| hwaddr_set = 0; |
| goto undo_mtu; |
| |
| undo_slave_mac: |
| set_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr)); |
| undo_mtu: |
| set_mtu(slave_ifname, slave.mtu.ifr_mtu); |
| return 1; |
| } |
| |
| static int release(char *master_ifname, char *slave_ifname) |
| { |
| struct ifreq ifr; |
| int res = 0; |
| |
| if (!(slave.flags.ifr_flags & IFF_SLAVE)) { |
| bb_error_msg("%s is not a slave", slave_ifname); |
| return 1; |
| } |
| |
| strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); |
| if (set_ifrname_and_do_ioctl(SIOCBONDRELEASE, &ifr, master_ifname) < 0 |
| && ioctl_on_skfd(BOND_RELEASE_OLD, &ifr) < 0 |
| ) { |
| return 1; |
| } |
| if (abi_ver < 1) { |
| /* The driver is using an old ABI, so we'll set the interface |
| * down to avoid any conflicts due to same MAC/IP |
| */ |
| res = set_if_down(slave_ifname, slave.flags.ifr_flags); |
| } |
| |
| /* set to default mtu */ |
| set_mtu(slave_ifname, 1500); |
| |
| return res; |
| } |
| |
| static NOINLINE void get_drv_info(char *master_ifname) |
| { |
| struct ifreq ifr; |
| struct ethtool_drvinfo info; |
| |
| memset(&ifr, 0, sizeof(ifr)); |
| ifr.ifr_data = (caddr_t)&info; |
| info.cmd = ETHTOOL_GDRVINFO; |
| /* both fields are 32 bytes long (long enough) */ |
| strcpy(info.driver, "ifenslave"); |
| strcpy(info.fw_version, utoa(BOND_ABI_VERSION)); |
| if (set_ifrname_and_do_ioctl(SIOCETHTOOL, &ifr, master_ifname) < 0) { |
| if (errno == EOPNOTSUPP) |
| return; |
| bb_perror_msg_and_die("%s: SIOCETHTOOL error", master_ifname); |
| } |
| |
| abi_ver = bb_strtou(info.fw_version, NULL, 0); |
| if (errno) |
| bb_error_msg_and_die("%s: SIOCETHTOOL error", master_ifname); |
| } |
| |
| int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int ifenslave_main(int argc UNUSED_PARAM, char **argv) |
| { |
| char *master_ifname, *slave_ifname; |
| int rv; |
| int res; |
| unsigned opt; |
| enum { |
| OPT_c = (1 << 0), |
| OPT_d = (1 << 1), |
| OPT_f = (1 << 2), |
| }; |
| #if ENABLE_LONG_OPTS |
| static const char ifenslave_longopts[] ALIGN1 = |
| "change-active\0" No_argument "c" |
| "detach\0" No_argument "d" |
| "force\0" No_argument "f" |
| /* "all-interfaces\0" No_argument "a" */ |
| ; |
| |
| applet_long_options = ifenslave_longopts; |
| #endif |
| INIT_G(); |
| |
| opt = getopt32(argv, "cdfa"); |
| argv += optind; |
| if (opt & (opt-1)) /* Only one option can be given */ |
| bb_show_usage(); |
| |
| master_ifname = *argv++; |
| |
| /* No interface names - show all interfaces. */ |
| if (!master_ifname) { |
| display_interfaces(NULL); |
| return EXIT_SUCCESS; |
| } |
| |
| /* Open a basic socket */ |
| xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), skfd); |
| |
| /* Exchange abi version with bonding module */ |
| get_drv_info(master_ifname); |
| |
| slave_ifname = *argv++; |
| if (!slave_ifname) { |
| if (opt & (OPT_d|OPT_c)) { |
| /* --change or --detach, and no slaves given - |
| * show all interfaces. */ |
| display_interfaces(slave_ifname /* == NULL */); |
| return 2; /* why 2? */ |
| } |
| /* A single arg means show the |
| * configuration for this interface |
| */ |
| display_interfaces(master_ifname); |
| return EXIT_SUCCESS; |
| } |
| |
| if (get_if_settings(master_ifname, &master)) { |
| /* Probably a good reason not to go on */ |
| bb_perror_msg_and_die("%s: can't get settings", master_ifname); |
| } |
| |
| /* Check if master is indeed a master; |
| * if not then fail any operation |
| */ |
| if (!(master.flags.ifr_flags & IFF_MASTER)) |
| bb_error_msg_and_die("%s is not a master", master_ifname); |
| |
| /* Check if master is up; if not then fail any operation */ |
| if (!(master.flags.ifr_flags & IFF_UP)) |
| bb_error_msg_and_die("%s is not up", master_ifname); |
| |
| #ifdef WHY_BOTHER |
| /* Neither -c[hange] nor -d[etach] -> it's "enslave" then; |
| * and -f[orce] is not there too. Check that it's ethernet. */ |
| if (!(opt & (OPT_d|OPT_c|OPT_f)) { |
| /* The family '1' is ARPHRD_ETHER for ethernet. */ |
| if (master.hwaddr.ifr_hwaddr.sa_family != 1) { |
| bb_error_msg_and_die( |
| "%s is not ethernet-like (-f overrides)", |
| master_ifname); |
| } |
| } |
| #endif |
| |
| /* Accepts only one slave */ |
| if (opt & OPT_c) { |
| /* Change active slave */ |
| if (get_slave_flags(slave_ifname)) { |
| bb_perror_msg_and_die( |
| "%s: can't get flags", slave_ifname); |
| } |
| change_active(master_ifname, slave_ifname); |
| return EXIT_SUCCESS; |
| } |
| |
| /* Accepts multiple slaves */ |
| res = 0; |
| do { |
| if (opt & OPT_d) { |
| /* Detach a slave interface from the master */ |
| rv = get_slave_flags(slave_ifname); |
| if (rv) { |
| /* Can't work with this slave, */ |
| /* remember the error and skip it */ |
| bb_perror_msg( |
| "skipping %s: can't get flags", |
| slave_ifname); |
| res = rv; |
| continue; |
| } |
| rv = release(master_ifname, slave_ifname); |
| if (rv) { |
| bb_perror_msg("can't release %s from %s", |
| slave_ifname, master_ifname); |
| res = rv; |
| } |
| } else { |
| /* Attach a slave interface to the master */ |
| rv = get_if_settings(slave_ifname, &slave); |
| if (rv) { |
| /* Can't work with this slave, */ |
| /* remember the error and skip it */ |
| bb_perror_msg( |
| "skipping %s: can't get settings", |
| slave_ifname); |
| res = rv; |
| continue; |
| } |
| rv = enslave(master_ifname, slave_ifname); |
| if (rv) { |
| bb_perror_msg("can't enslave %s to %s", |
| slave_ifname, master_ifname); |
| res = rv; |
| } |
| } |
| } while ((slave_ifname = *argv++) != NULL); |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| close(skfd); |
| } |
| |
| return res; |
| } |