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.
*/
set_if_addr(master_ifname, slave_ifname);
} 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 its 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 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) {
/*
*/
set_if_addr(master_ifname, slave_ifname);
} 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) {
/*
*/
if (abi_ver < 1) {
/*
*/
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;
}
/*
*/
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;
}
}
/*
*/
} else {
/*
*/
if (abi_ver < 1) {
/*
*/
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) {
/*
*/
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;
}
/* */
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;
/* */
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;
}