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linux/Documentation/networking/ifenslave.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

1111 lines
29 KiB
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/* Mode: C;
* 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
*/
#define APP_VERSION "1.1.0"
#define APP_RELDATE "December 1, 2003"
#define APP_NAME "ifenslave"
static char *version =
APP_NAME ".c:v" APP_VERSION " (" APP_RELDATE ")\n"
"o Donald Becker (becker@cesdis.gsfc.nasa.gov).\n"
"o Detach support added on 2000/10/02 by Willy Tarreau (willy at meta-x.org).\n"
"o 2.4 kernel support added on 2001/02/16 by Chad N. Tindel\n"
" (ctindel at ieee dot org).\n";
static const char *usage_msg =
"Usage: ifenslave [-f] <master-if> <slave-if> [<slave-if>...]\n"
" ifenslave -d <master-if> <slave-if> [<slave-if>...]\n"
" ifenslave -c <master-if> <slave-if>\n"
" ifenslave --help\n";
static const char *help_msg =
"\n"
" To create a bond device, simply follow these three steps :\n"
" - ensure that the required drivers are properly loaded :\n"
" # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>\n"
" - assign an IP address to the bond device :\n"
" # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>\n"
" - attach all the interfaces you need to the bond device :\n"
" # ifenslave [{-f|--force}] bond0 eth0 [eth1 [eth2]...]\n"
" If bond0 didn't have a MAC address, it will take eth0's. Then, all\n"
" interfaces attached AFTER this assignment will get the same MAC addr.\n"
" (except for ALB/TLB modes)\n"
"\n"
" To set the bond device down and automatically release all the slaves :\n"
" # ifconfig bond0 down\n"
"\n"
" To detach a dead interface without setting the bond device down :\n"
" # ifenslave {-d|--detach} bond0 eth0 [eth1 [eth2]...]\n"
"\n"
" To change active slave :\n"
" # ifenslave {-c|--change-active} bond0 eth0\n"
"\n"
" To show master interface info\n"
" # ifenslave bond0\n"
"\n"
" To show all interfaces info\n"
" # ifenslave {-a|--all-interfaces}\n"
"\n"
" To be more verbose\n"
" # ifenslave {-v|--verbose} ...\n"
"\n"
" # ifenslave {-u|--usage} Show usage\n"
" # ifenslave {-V|--version} Show version\n"
" # ifenslave {-h|--help} This message\n"
"\n";
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/if.h>
#include <net/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_bonding.h>
#include <linux/sockios.h>
typedef unsigned long long u64; /* hack, so we may include kernel's ethtool.h */
typedef __uint32_t u32; /* ditto */
typedef __uint16_t u16; /* ditto */
typedef __uint8_t u8; /* ditto */
#include <linux/ethtool.h>
struct option longopts[] = {
/* { name has_arg *flag val } */
{"all-interfaces", 0, 0, 'a'}, /* Show all interfaces. */
{"change-active", 0, 0, 'c'}, /* Change the active slave. */
{"detach", 0, 0, 'd'}, /* Detach a slave interface. */
{"force", 0, 0, 'f'}, /* Force the operation. */
{"help", 0, 0, 'h'}, /* Give help */
{"usage", 0, 0, 'u'}, /* Give usage */
{"verbose", 0, 0, 'v'}, /* Report each action taken. */
{"version", 0, 0, 'V'}, /* Emit version information. */
{ 0, 0, 0, 0}
};
/* Command-line flags. */
unsigned int
opt_a = 0, /* Show-all-interfaces flag. */
opt_c = 0, /* Change-active-slave flag. */
opt_d = 0, /* Detach a slave interface. */
opt_f = 0, /* Force the operation. */
opt_h = 0, /* Help */
opt_u = 0, /* Usage */
opt_v = 0, /* Verbose flag. */
opt_V = 0; /* Version */
int skfd = -1; /* AF_INET socket for ioctl() calls.*/
int abi_ver = 0; /* userland - kernel ABI version */
int hwaddr_set = 0; /* Master's hwaddr is set */
int saved_errno;
struct ifreq master_mtu, master_flags, master_hwaddr;
struct ifreq slave_mtu, slave_flags, slave_hwaddr;
struct dev_ifr {
struct ifreq *req_ifr;
char *req_name;
int req_type;
};
struct dev_ifr master_ifra[] = {
{&master_mtu, "SIOCGIFMTU", SIOCGIFMTU},
{&master_flags, "SIOCGIFFLAGS", SIOCGIFFLAGS},
{&master_hwaddr, "SIOCGIFHWADDR", SIOCGIFHWADDR},
{NULL, "", 0}
};
struct dev_ifr slave_ifra[] = {
{&slave_mtu, "SIOCGIFMTU", SIOCGIFMTU},
{&slave_flags, "SIOCGIFFLAGS", SIOCGIFFLAGS},
{&slave_hwaddr, "SIOCGIFHWADDR", SIOCGIFHWADDR},
{NULL, "", 0}
};
static void if_print(char *ifname);
static int get_drv_info(char *master_ifname);
static int get_if_settings(char *ifname, struct dev_ifr ifra[]);
static int get_slave_flags(char *slave_ifname);
static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr);
static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr);
static int set_slave_mtu(char *slave_ifname, int mtu);
static int set_if_flags(char *ifname, short flags);
static int set_if_up(char *ifname, short flags);
static int set_if_down(char *ifname, short flags);
static int clear_if_addr(char *ifname);
static int set_if_addr(char *master_ifname, char *slave_ifname);
static int change_active(char *master_ifname, char *slave_ifname);
static int enslave(char *master_ifname, char *slave_ifname);
static int release(char *master_ifname, char *slave_ifname);
#define v_print(fmt, args...) \
if (opt_v) \
fprintf(stderr, fmt, ## args )
int main(int argc, char *argv[])
{
char **spp, *master_ifname, *slave_ifname;
int c, i, rv;
int res = 0;
int exclusive = 0;
while ((c = getopt_long(argc, argv, "acdfhuvV", longopts, 0)) != EOF) {
switch (c) {
case 'a': opt_a++; exclusive++; break;
case 'c': opt_c++; exclusive++; break;
case 'd': opt_d++; exclusive++; break;
case 'f': opt_f++; exclusive++; break;
case 'h': opt_h++; exclusive++; break;
case 'u': opt_u++; exclusive++; break;
case 'v': opt_v++; break;
case 'V': opt_V++; exclusive++; break;
case '?':
fprintf(stderr, usage_msg);
res = 2;
goto out;
}
}
/* options check */
if (exclusive > 1) {
fprintf(stderr, usage_msg);
res = 2;
goto out;
}
if (opt_v || opt_V) {
printf(version);
if (opt_V) {
res = 0;
goto out;
}
}
if (opt_u) {
printf(usage_msg);
res = 0;
goto out;
}
if (opt_h) {
printf(usage_msg);
printf(help_msg);
res = 0;
goto out;
}
/* Open a basic socket */
if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
res = 1;
goto out;
}
if (opt_a) {
if (optind == argc) {
/* No remaining args */
/* show all interfaces */
if_print((char *)NULL);
goto out;
} else {
/* Just show usage */
fprintf(stderr, usage_msg);
res = 2;
goto out;
}
}
/* Copy the interface name */
spp = argv + optind;
master_ifname = *spp++;
if (master_ifname == NULL) {
fprintf(stderr, usage_msg);
res = 2;
goto out;
}
/* exchange abi version with bonding module */
res = get_drv_info(master_ifname);
if (res) {
fprintf(stderr,
"Master '%s': Error: handshake with driver failed. "
"Aborting\n",
master_ifname);
goto out;
}
slave_ifname = *spp++;
if (slave_ifname == NULL) {
if (opt_d || opt_c) {
fprintf(stderr, usage_msg);
res = 2;
goto out;
}
/* A single arg means show the
* configuration for this interface
*/
if_print(master_ifname);
goto out;
}
res = get_if_settings(master_ifname, master_ifra);
if (res) {
/* Probably a good reason not to go on */
fprintf(stderr,
"Master '%s': Error: get settings failed: %s. "
"Aborting\n",
master_ifname, strerror(res));
goto out;
}
/* check if master is indeed a master;
* if not then fail any operation
*/
if (!(master_flags.ifr_flags & IFF_MASTER)) {
fprintf(stderr,
"Illegal operation; the specified interface '%s' "
"is not a master. Aborting\n",
master_ifname);
res = 1;
goto out;
}
/* check if master is up; if not then fail any operation */
if (!(master_flags.ifr_flags & IFF_UP)) {
fprintf(stderr,
"Illegal operation; the specified master interface "
"'%s' is not up.\n",
master_ifname);
res = 1;
goto out;
}
/* Only for enslaving */
if (!opt_c && !opt_d) {
sa_family_t master_family = master_hwaddr.ifr_hwaddr.sa_family;
unsigned char *hwaddr =
(unsigned char *)master_hwaddr.ifr_hwaddr.sa_data;
/* The family '1' is ARPHRD_ETHER for ethernet. */
if (master_family != 1 && !opt_f) {
fprintf(stderr,
"Illegal operation: The specified master "
"interface '%s' is not ethernet-like.\n "
"This program is designed to work with "
"ethernet-like network interfaces.\n "
"Use the '-f' option to force the "
"operation.\n",
master_ifname);
res = 1;
goto out;
}
/* Check master's hw addr */
for (i = 0; i < 6; i++) {
if (hwaddr[i] != 0) {
hwaddr_set = 1;
break;
}
}
if (hwaddr_set) {
v_print("current hardware address of master '%s' "
"is %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x, "
"type %d\n",
master_ifname,
hwaddr[0], hwaddr[1],
hwaddr[2], hwaddr[3],
hwaddr[4], hwaddr[5],
master_family);
}
}
/* Accepts only one slave */
if (opt_c) {
/* change active slave */
res = get_slave_flags(slave_ifname);
if (res) {
fprintf(stderr,
"Slave '%s': Error: get flags failed. "
"Aborting\n",
slave_ifname);
goto out;
}
res = change_active(master_ifname, slave_ifname);
if (res) {
fprintf(stderr,
"Master '%s', Slave '%s': Error: "
"Change active failed\n",
master_ifname, slave_ifname);
}
} else {
/* Accept multiple slaves */
do {
if (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*/
fprintf(stderr,
"Slave '%s': Error: get flags "
"failed. Skipping\n",
slave_ifname);
res = rv;
continue;
}
rv = release(master_ifname, slave_ifname);
if (rv) {
fprintf(stderr,
"Master '%s', Slave '%s': Error: "
"Release failed\n",
master_ifname, slave_ifname);
res = rv;
}
} else {
/* attach a slave interface to the master */
rv = get_if_settings(slave_ifname, slave_ifra);
if (rv) {
/* Can't work with this slave. */
/* remember the error and skip it*/
fprintf(stderr,
"Slave '%s': Error: get "
"settings failed: %s. "
"Skipping\n",
slave_ifname, strerror(rv));
res = rv;
continue;
}
rv = enslave(master_ifname, slave_ifname);
if (rv) {
fprintf(stderr,
"Master '%s', Slave '%s': Error: "
"Enslave failed\n",
master_ifname, slave_ifname);
res = rv;
}
}
} while ((slave_ifname = *spp++) != NULL);
}
out:
if (skfd >= 0) {
close(skfd);
}
return res;
}
static short mif_flags;
/* Get the inteface configuration from the kernel. */
static int if_getconfig(char *ifname)
{
struct ifreq ifr;
int metric, mtu; /* Parameters of the master interface. */
struct sockaddr dstaddr, broadaddr, netmask;
unsigned char *hwaddr;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
return -1;
mif_flags = ifr.ifr_flags;
printf("The result of SIOCGIFFLAGS on %s is %x.\n",
ifname, ifr.ifr_flags);
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0)
return -1;
printf("The result of SIOCGIFADDR is %2.2x.%2.2x.%2.2x.%2.2x.\n",
ifr.ifr_addr.sa_data[0], ifr.ifr_addr.sa_data[1],
ifr.ifr_addr.sa_data[2], ifr.ifr_addr.sa_data[3]);
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
return -1;
/* Gotta convert from 'char' to unsigned for printf(). */
hwaddr = (unsigned char *)ifr.ifr_hwaddr.sa_data;
printf("The result of SIOCGIFHWADDR is type %d "
"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
ifr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0) {
metric = 0;
} else
metric = ifr.ifr_metric;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
mtu = 0;
else
mtu = ifr.ifr_mtu;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) < 0) {
memset(&dstaddr, 0, sizeof(struct sockaddr));
} else
dstaddr = ifr.ifr_dstaddr;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) < 0) {
memset(&broadaddr, 0, sizeof(struct sockaddr));
} else
broadaddr = ifr.ifr_broadaddr;
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFNETMASK, &ifr) < 0) {
memset(&netmask, 0, sizeof(struct sockaddr));
} else
netmask = ifr.ifr_netmask;
return 0;
}
static void if_print(char *ifname)
{
char buff[1024];
struct ifconf ifc;
struct ifreq *ifr;
int i;
if (ifname == (char *)NULL) {
ifc.ifc_len = sizeof(buff);
ifc.ifc_buf = buff;
if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
perror("SIOCGIFCONF failed");
return;
}
ifr = ifc.ifc_req;
for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++) {
if (if_getconfig(ifr->ifr_name) < 0) {
fprintf(stderr,
"%s: unknown interface.\n",
ifr->ifr_name);
continue;
}
if (((mif_flags & IFF_UP) == 0) && !opt_a) continue;
/*ife_print(&ife);*/
}
} else {
if (if_getconfig(ifname) < 0) {
fprintf(stderr,
"%s: unknown interface.\n", ifname);
}
}
}
static int get_drv_info(char *master_ifname)
{
struct ifreq ifr;
struct ethtool_drvinfo info;
char *endptr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
ifr.ifr_data = (caddr_t)&info;
info.cmd = ETHTOOL_GDRVINFO;
strncpy(info.driver, "ifenslave", 32);
snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION);
if (ioctl(skfd, SIOCETHTOOL, &ifr) < 0) {
if (errno == EOPNOTSUPP) {
goto out;
}
saved_errno = errno;
v_print("Master '%s': Error: get bonding info failed %s\n",
master_ifname, strerror(saved_errno));
return 1;
}
abi_ver = strtoul(info.fw_version, &endptr, 0);
if (*endptr) {
v_print("Master '%s': Error: got invalid string as an ABI "
"version from the bonding module\n",
master_ifname);
return 1;
}
out:
v_print("ABI ver is %d\n", abi_ver);
return 0;
}
static int change_active(char *master_ifname, char *slave_ifname)
{
struct ifreq ifr;
int res = 0;
if (!(slave_flags.ifr_flags & IFF_SLAVE)) {
fprintf(stderr,
"Illegal operation: The specified slave interface "
"'%s' is not a slave\n",
slave_ifname);
return 1;
}
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
if ((ioctl(skfd, SIOCBONDCHANGEACTIVE, &ifr) < 0) &&
(ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &ifr) < 0)) {
saved_errno = errno;
v_print("Master '%s': Error: SIOCBONDCHANGEACTIVE failed: "
"%s\n",
master_ifname, strerror(saved_errno));
res = 1;
}
return res;
}
static int enslave(char *master_ifname, char *slave_ifname)
{
struct ifreq ifr;
int res = 0;
if (slave_flags.ifr_flags & IFF_SLAVE) {
fprintf(stderr,
"Illegal operation: The specified slave interface "
"'%s' is already a slave\n",
slave_ifname);
return 1;
}
res = set_if_down(slave_ifname, slave_flags.ifr_flags);
if (res) {
fprintf(stderr,
"Slave '%s': Error: bring interface down failed\n",
slave_ifname);
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) {
fprintf(stderr,
"Slave '%s': Error: set address failed\n",
slave_ifname);
return res;
}
} else {
res = clear_if_addr(slave_ifname);
if (res) {
fprintf(stderr,
"Slave '%s': Error: clear address failed\n",
slave_ifname);
return res;
}
}
if (master_mtu.ifr_mtu != slave_mtu.ifr_mtu) {
res = set_slave_mtu(slave_ifname, master_mtu.ifr_mtu);
if (res) {
fprintf(stderr,
"Slave '%s': Error: set MTU failed\n",
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
*/
res = set_slave_hwaddr(slave_ifname,
&(master_hwaddr.ifr_hwaddr));
if (res) {
fprintf(stderr,
"Slave '%s': Error: set hw address "
"failed\n",
slave_ifname);
goto undo_mtu;
}
/* For old ABI the application needs to bring the
* slave back up
*/
res = set_if_up(slave_ifname, slave_flags.ifr_flags);
if (res) {
fprintf(stderr,
"Slave '%s': Error: bring interface "
"down failed\n",
slave_ifname);
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
*/
res = set_if_down(master_ifname, master_flags.ifr_flags);
if (res) {
fprintf(stderr,
"Master '%s': Error: bring interface "
"down failed\n",
master_ifname);
goto undo_mtu;
}
}
res = set_master_hwaddr(master_ifname,
&(slave_hwaddr.ifr_hwaddr));
if (res) {
fprintf(stderr,
"Master '%s': Error: set hw address "
"failed\n",
master_ifname);
goto undo_mtu;
}
if (abi_ver < 1) {
/* For old ABI, bring the master
* back up
*/
res = set_if_up(master_ifname, master_flags.ifr_flags);
if (res) {
fprintf(stderr,
"Master '%s': Error: bring interface "
"up failed\n",
master_ifname);
goto undo_master_mac;
}
}
hwaddr_set = 1;
}
/* Do the real thing */
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
if ((ioctl(skfd, SIOCBONDENSLAVE, &ifr) < 0) &&
(ioctl(skfd, BOND_ENSLAVE_OLD, &ifr) < 0)) {
saved_errno = errno;
v_print("Master '%s': Error: SIOCBONDENSLAVE failed: %s\n",
master_ifname, strerror(saved_errno));
res = 1;
}
if (res) {
goto undo_master_mac;
}
return 0;
/* rollback (best effort) */
undo_master_mac:
set_master_hwaddr(master_ifname, &(master_hwaddr.ifr_hwaddr));
hwaddr_set = 0;
goto undo_mtu;
undo_slave_mac:
set_slave_hwaddr(slave_ifname, &(slave_hwaddr.ifr_hwaddr));
undo_mtu:
set_slave_mtu(slave_ifname, slave_mtu.ifr_mtu);
return res;
}
static int release(char *master_ifname, char *slave_ifname)
{
struct ifreq ifr;
int res = 0;
if (!(slave_flags.ifr_flags & IFF_SLAVE)) {
fprintf(stderr,
"Illegal operation: The specified slave interface "
"'%s' is not a slave\n",
slave_ifname);
return 1;
}
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
if ((ioctl(skfd, SIOCBONDRELEASE, &ifr) < 0) &&
(ioctl(skfd, BOND_RELEASE_OLD, &ifr) < 0)) {
saved_errno = errno;
v_print("Master '%s': Error: SIOCBONDRELEASE failed: %s\n",
master_ifname, strerror(saved_errno));
return 1;
} else 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);
if (res) {
fprintf(stderr,
"Slave '%s': Error: bring interface "
"down failed\n",
slave_ifname);
}
}
/* set to default mtu */
set_slave_mtu(slave_ifname, 1500);
return res;
}
static int get_if_settings(char *ifname, struct dev_ifr ifra[])
{
int i;
int res = 0;
for (i = 0; ifra[i].req_ifr; i++) {
strncpy(ifra[i].req_ifr->ifr_name, ifname, IFNAMSIZ);
res = ioctl(skfd, ifra[i].req_type, ifra[i].req_ifr);
if (res < 0) {
saved_errno = errno;
v_print("Interface '%s': Error: %s failed: %s\n",
ifname, ifra[i].req_name,
strerror(saved_errno));
return saved_errno;
}
}
return 0;
}
static int get_slave_flags(char *slave_ifname)
{
int res = 0;
strncpy(slave_flags.ifr_name, slave_ifname, IFNAMSIZ);
res = ioctl(skfd, SIOCGIFFLAGS, &slave_flags);
if (res < 0) {
saved_errno = errno;
v_print("Slave '%s': Error: SIOCGIFFLAGS failed: %s\n",
slave_ifname, strerror(saved_errno));
} else {
v_print("Slave %s: flags %04X.\n",
slave_ifname, slave_flags.ifr_flags);
}
return res;
}
static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr)
{
unsigned char *addr = (unsigned char *)hwaddr->sa_data;
struct ifreq ifr;
int res = 0;
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
if (res < 0) {
saved_errno = errno;
v_print("Master '%s': Error: SIOCSIFHWADDR failed: %s\n",
master_ifname, strerror(saved_errno));
return res;
} else {
v_print("Master '%s': hardware address set to "
"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
master_ifname, addr[0], addr[1], addr[2],
addr[3], addr[4], addr[5]);
}
return res;
}
static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr)
{
unsigned char *addr = (unsigned char *)hwaddr->sa_data;
struct ifreq ifr;
int res = 0;
strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
if (res < 0) {
saved_errno = errno;
v_print("Slave '%s': Error: SIOCSIFHWADDR failed: %s\n",
slave_ifname, strerror(saved_errno));
if (saved_errno == EBUSY) {
v_print(" The device is busy: it must be idle "
"before running this command.\n");
} else if (saved_errno == EOPNOTSUPP) {
v_print(" The device does not support setting "
"the MAC address.\n"
" Your kernel likely does not support slave "
"devices.\n");
} else if (saved_errno == EINVAL) {
v_print(" The device's address type does not match "
"the master's address type.\n");
}
return res;
} else {
v_print("Slave '%s': hardware address set to "
"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
slave_ifname, addr[0], addr[1], addr[2],
addr[3], addr[4], addr[5]);
}
return res;
}
static int set_slave_mtu(char *slave_ifname, int mtu)
{
struct ifreq ifr;
int res = 0;
ifr.ifr_mtu = mtu;
strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
res = ioctl(skfd, SIOCSIFMTU, &ifr);
if (res < 0) {
saved_errno = errno;
v_print("Slave '%s': Error: SIOCSIFMTU failed: %s\n",
slave_ifname, strerror(saved_errno));
} else {
v_print("Slave '%s': MTU set to %d.\n", slave_ifname, mtu);
}
return res;
}
static int set_if_flags(char *ifname, short flags)
{
struct ifreq ifr;
int res = 0;
ifr.ifr_flags = flags;
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
res = ioctl(skfd, SIOCSIFFLAGS, &ifr);
if (res < 0) {
saved_errno = errno;
v_print("Interface '%s': Error: SIOCSIFFLAGS failed: %s\n",
ifname, strerror(saved_errno));
} else {
v_print("Interface '%s': flags set to %04X.\n", ifname, flags);
}
return res;
}
static int set_if_up(char *ifname, short flags)
{
return set_if_flags(ifname, flags | IFF_UP);
}
static int set_if_down(char *ifname, short flags)
{
return set_if_flags(ifname, flags & ~IFF_UP);
}
static int clear_if_addr(char *ifname)
{
struct ifreq ifr;
int res = 0;
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
ifr.ifr_addr.sa_family = AF_INET;
memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
res = ioctl(skfd, SIOCSIFADDR, &ifr);
if (res < 0) {
saved_errno = errno;
v_print("Interface '%s': Error: SIOCSIFADDR failed: %s\n",
ifname, strerror(saved_errno));
} else {
v_print("Interface '%s': address cleared\n", ifname);
}
return res;
}
static int set_if_addr(char *master_ifname, char *slave_ifname)
{
struct ifreq ifr;
int res;
unsigned char *ipaddr;
int i;
struct {
char *req_name;
char *desc;
int g_ioctl;
int s_ioctl;
} ifra[] = {
{"IFADDR", "addr", SIOCGIFADDR, SIOCSIFADDR},
{"DSTADDR", "destination addr", SIOCGIFDSTADDR, SIOCSIFDSTADDR},
{"BRDADDR", "broadcast addr", SIOCGIFBRDADDR, SIOCSIFBRDADDR},
{"NETMASK", "netmask", SIOCGIFNETMASK, SIOCSIFNETMASK},
{NULL, NULL, 0, 0},
};
for (i = 0; ifra[i].req_name; i++) {
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
res = ioctl(skfd, ifra[i].g_ioctl, &ifr);
if (res < 0) {
int saved_errno = errno;
v_print("Interface '%s': Error: SIOCG%s failed: %s\n",
master_ifname, ifra[i].req_name,
strerror(saved_errno));
ifr.ifr_addr.sa_family = AF_INET;
memset(ifr.ifr_addr.sa_data, 0,
sizeof(ifr.ifr_addr.sa_data));
}
strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
res = ioctl(skfd, ifra[i].s_ioctl, &ifr);
if (res < 0) {
int saved_errno = errno;
v_print("Interface '%s': Error: SIOCS%s failed: %s\n",
slave_ifname, ifra[i].req_name,
strerror(saved_errno));
return res;
}
ipaddr = ifr.ifr_addr.sa_data;
v_print("Interface '%s': set IP %s to %d.%d.%d.%d\n",
slave_ifname, ifra[i].desc,
ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
}
return 0;
}
/*
* Local variables:
* version-control: t
* kept-new-versions: 5
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* compile-command: "gcc -Wall -Wstrict-prototypes -O -I/usr/src/linux/include ifenslave.c -o ifenslave"
* End:
*/
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