2 * ifenslave.c: Configure network interfaces for parallel routing.
4 * This program controls the Linux implementation of running multiple
5 * network interfaces in parallel.
7 * Author: Donald Becker <becker@cesdis.gsfc.nasa.gov>
8 * Copyright 1994-1996 Donald Becker
10 * This program is free software; you can redistribute it
11 * and/or modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
15 * Center of Excellence in Space Data and Information Sciences
16 * Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
19 * - 2000/10/02 Willy Tarreau <willy at meta-x.org> :
20 * - few fixes. Master's MAC address is now correctly taken from
21 * the first device when not previously set ;
22 * - detach support : call BOND_RELEASE to detach an enslaved interface.
23 * - give a mini-howto from command-line help : # ifenslave -h
25 * - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :
26 * - Master is now brought down before setting the MAC address. In
27 * the 2.4 kernel you can't change the MAC address while the device is
28 * up because you get EBUSY.
30 * - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>
31 * - Added the ability to change the active interface on a mode 1 bond
34 * - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :
35 * - No longer set the MAC address of the master. The bond device will
36 * take care of this itself
37 * - Try the SIOC*** versions of the bonding ioctls before using the
39 * - 2002/02/18 Erik Habbinga <erik_habbinga @ hp dot com> :
40 * - ifr2.ifr_flags was not initialized in the hwaddr_notset case,
41 * SIOCGIFFLAGS now called before hwaddr_notset test
43 * - 2002/10/31 Tony Cureington <tony.cureington * hp_com> :
44 * - If the master does not have a hardware address when the first slave
45 * is enslaved, the master is assigned the hardware address of that
46 * slave - there is a comment in bonding.c stating "ifenslave takes
47 * care of this now." This corrects the problem of slaves having
48 * different hardware addresses in active-backup mode when
49 * multiple interfaces are specified on a single ifenslave command
50 * (ifenslave bond0 eth0 eth1).
52 * - 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
53 * Shmulik Hen <shmulik.hen at intel dot com>
54 * - Moved setting the slave's mac address and openning it, from
55 * the application to the driver. This enables support of modes
56 * that need to use the unique mac address of each slave.
57 * The driver also takes care of closing the slave and restoring its
58 * original mac address upon release.
59 * In addition, block possibility of enslaving before the master is up.
60 * This prevents putting the system in an undefined state.
62 * - 2003/05/01 - Amir Noam <amir.noam at intel dot com>
63 * - Added ABI version control to restore compatibility between
64 * new/old ifenslave and new/old bonding.
65 * - Prevent adding an adapter that is already a slave.
66 * Fixes the problem of stalling the transmission and leaving
67 * the slave in a down state.
69 * - 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
70 * - Prevent enslaving if the bond device is down.
71 * Fixes the problem of leaving the system in unstable state and
72 * halting when trying to remove the module.
73 * - Close socket on all abnormal exists.
74 * - Add versioning scheme that follows that of the bonding driver.
75 * current version is 1.0.0 as a base line.
77 * - 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com>
78 * - ifenslave -c was broken; it's now fixed
79 * - Fixed problem with routes vanishing from master during enslave
82 * - 2003/05/27 - Amir Noam <amir.noam at intel dot com>
83 * - Fix backward compatibility issues:
84 * For drivers not using ABI versions, slave was set down while
85 * it should be left up before enslaving.
86 * Also, master was not set down and the default set_mac_address()
87 * would fail and generate an error message in the system log.
88 * - For opt_c: slave should not be set to the master's setting
89 * while it is running. It was already set during enslave. To
90 * simplify things, it is now handled separately.
92 * - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
93 * - Code cleanup and style changes
94 * set version to 1.1.0
97 #define APP_VERSION "1.1.0"
98 #define APP_RELDATE "December 1, 2003"
99 #define APP_NAME "ifenslave"
101 static char *version
=
102 APP_NAME
".c:v" APP_VERSION
" (" APP_RELDATE
")\n"
103 "o Donald Becker (becker@cesdis.gsfc.nasa.gov).\n"
104 "o Detach support added on 2000/10/02 by Willy Tarreau (willy at meta-x.org).\n"
105 "o 2.4 kernel support added on 2001/02/16 by Chad N. Tindel\n"
106 " (ctindel at ieee dot org).\n";
108 static const char *usage_msg
=
109 "Usage: ifenslave [-f] <master-if> <slave-if> [<slave-if>...]\n"
110 " ifenslave -d <master-if> <slave-if> [<slave-if>...]\n"
111 " ifenslave -c <master-if> <slave-if>\n"
112 " ifenslave --help\n";
114 static const char *help_msg
=
116 " To create a bond device, simply follow these three steps :\n"
117 " - ensure that the required drivers are properly loaded :\n"
118 " # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>\n"
119 " - assign an IP address to the bond device :\n"
120 " # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>\n"
121 " - attach all the interfaces you need to the bond device :\n"
122 " # ifenslave [{-f|--force}] bond0 eth0 [eth1 [eth2]...]\n"
123 " If bond0 didn't have a MAC address, it will take eth0's. Then, all\n"
124 " interfaces attached AFTER this assignment will get the same MAC addr.\n"
125 " (except for ALB/TLB modes)\n"
127 " To set the bond device down and automatically release all the slaves :\n"
128 " # ifconfig bond0 down\n"
130 " To detach a dead interface without setting the bond device down :\n"
131 " # ifenslave {-d|--detach} bond0 eth0 [eth1 [eth2]...]\n"
133 " To change active slave :\n"
134 " # ifenslave {-c|--change-active} bond0 eth0\n"
136 " To show master interface info\n"
137 " # ifenslave bond0\n"
139 " To show all interfaces info\n"
140 " # ifenslave {-a|--all-interfaces}\n"
142 " To be more verbose\n"
143 " # ifenslave {-v|--verbose} ...\n"
145 " # ifenslave {-u|--usage} Show usage\n"
146 " # ifenslave {-V|--version} Show version\n"
147 " # ifenslave {-h|--help} This message\n"
158 #include <sys/types.h>
159 #include <sys/socket.h>
160 #include <sys/ioctl.h>
161 #include <linux/if.h>
162 #include <net/if_arp.h>
163 #include <linux/if_ether.h>
164 #include <linux/if_bonding.h>
165 #include <linux/sockios.h>
167 typedef unsigned long long u64
; /* hack, so we may include kernel's ethtool.h */
168 typedef __uint32_t u32
; /* ditto */
169 typedef __uint16_t u16
; /* ditto */
170 typedef __uint8_t u8
; /* ditto */
171 #include <linux/ethtool.h>
173 struct option longopts
[] = {
174 /* { name has_arg *flag val } */
175 {"all-interfaces", 0, 0, 'a'}, /* Show all interfaces. */
176 {"change-active", 0, 0, 'c'}, /* Change the active slave. */
177 {"detach", 0, 0, 'd'}, /* Detach a slave interface. */
178 {"force", 0, 0, 'f'}, /* Force the operation. */
179 {"help", 0, 0, 'h'}, /* Give help */
180 {"usage", 0, 0, 'u'}, /* Give usage */
181 {"verbose", 0, 0, 'v'}, /* Report each action taken. */
182 {"version", 0, 0, 'V'}, /* Emit version information. */
186 /* Command-line flags. */
188 opt_a
= 0, /* Show-all-interfaces flag. */
189 opt_c
= 0, /* Change-active-slave flag. */
190 opt_d
= 0, /* Detach a slave interface. */
191 opt_f
= 0, /* Force the operation. */
192 opt_h
= 0, /* Help */
193 opt_u
= 0, /* Usage */
194 opt_v
= 0, /* Verbose flag. */
195 opt_V
= 0; /* Version */
197 int skfd
= -1; /* AF_INET socket for ioctl() calls.*/
198 int abi_ver
= 0; /* userland - kernel ABI version */
199 int hwaddr_set
= 0; /* Master's hwaddr is set */
202 struct ifreq master_mtu
, master_flags
, master_hwaddr
;
203 struct ifreq slave_mtu
, slave_flags
, slave_hwaddr
;
206 struct ifreq
*req_ifr
;
211 struct dev_ifr master_ifra
[] = {
212 {&master_mtu
, "SIOCGIFMTU", SIOCGIFMTU
},
213 {&master_flags
, "SIOCGIFFLAGS", SIOCGIFFLAGS
},
214 {&master_hwaddr
, "SIOCGIFHWADDR", SIOCGIFHWADDR
},
218 struct dev_ifr slave_ifra
[] = {
219 {&slave_mtu
, "SIOCGIFMTU", SIOCGIFMTU
},
220 {&slave_flags
, "SIOCGIFFLAGS", SIOCGIFFLAGS
},
221 {&slave_hwaddr
, "SIOCGIFHWADDR", SIOCGIFHWADDR
},
225 static void if_print(char *ifname
);
226 static int get_drv_info(char *master_ifname
);
227 static int get_if_settings(char *ifname
, struct dev_ifr ifra
[]);
228 static int get_slave_flags(char *slave_ifname
);
229 static int set_master_hwaddr(char *master_ifname
, struct sockaddr
*hwaddr
);
230 static int set_slave_hwaddr(char *slave_ifname
, struct sockaddr
*hwaddr
);
231 static int set_slave_mtu(char *slave_ifname
, int mtu
);
232 static int set_if_flags(char *ifname
, short flags
);
233 static int set_if_up(char *ifname
, short flags
);
234 static int set_if_down(char *ifname
, short flags
);
235 static int clear_if_addr(char *ifname
);
236 static int set_if_addr(char *master_ifname
, char *slave_ifname
);
237 static int change_active(char *master_ifname
, char *slave_ifname
);
238 static int enslave(char *master_ifname
, char *slave_ifname
);
239 static int release(char *master_ifname
, char *slave_ifname
);
240 #define v_print(fmt, args...) \
242 fprintf(stderr, fmt, ## args )
244 int main(int argc
, char *argv
[])
246 char **spp
, *master_ifname
, *slave_ifname
;
251 while ((c
= getopt_long(argc
, argv
, "acdfhuvV", longopts
, 0)) != EOF
) {
253 case 'a': opt_a
++; exclusive
++; break;
254 case 'c': opt_c
++; exclusive
++; break;
255 case 'd': opt_d
++; exclusive
++; break;
256 case 'f': opt_f
++; exclusive
++; break;
257 case 'h': opt_h
++; exclusive
++; break;
258 case 'u': opt_u
++; exclusive
++; break;
259 case 'v': opt_v
++; break;
260 case 'V': opt_V
++; exclusive
++; break;
263 fprintf(stderr
, usage_msg
);
271 fprintf(stderr
, usage_msg
);
276 if (opt_v
|| opt_V
) {
297 /* Open a basic socket */
298 if ((skfd
= socket(AF_INET
, SOCK_DGRAM
, 0)) < 0) {
305 if (optind
== argc
) {
306 /* No remaining args */
307 /* show all interfaces */
308 if_print((char *)NULL
);
311 /* Just show usage */
312 fprintf(stderr
, usage_msg
);
318 /* Copy the interface name */
320 master_ifname
= *spp
++;
322 if (master_ifname
== NULL
) {
323 fprintf(stderr
, usage_msg
);
328 /* exchange abi version with bonding module */
329 res
= get_drv_info(master_ifname
);
332 "Master '%s': Error: handshake with driver failed. "
338 slave_ifname
= *spp
++;
340 if (slave_ifname
== NULL
) {
341 if (opt_d
|| opt_c
) {
342 fprintf(stderr
, usage_msg
);
347 /* A single arg means show the
348 * configuration for this interface
350 if_print(master_ifname
);
354 res
= get_if_settings(master_ifname
, master_ifra
);
356 /* Probably a good reason not to go on */
358 "Master '%s': Error: get settings failed: %s. "
360 master_ifname
, strerror(res
));
364 /* check if master is indeed a master;
365 * if not then fail any operation
367 if (!(master_flags
.ifr_flags
& IFF_MASTER
)) {
369 "Illegal operation; the specified interface '%s' "
370 "is not a master. Aborting\n",
376 /* check if master is up; if not then fail any operation */
377 if (!(master_flags
.ifr_flags
& IFF_UP
)) {
379 "Illegal operation; the specified master interface "
386 /* Only for enslaving */
387 if (!opt_c
&& !opt_d
) {
388 sa_family_t master_family
= master_hwaddr
.ifr_hwaddr
.sa_family
;
389 unsigned char *hwaddr
=
390 (unsigned char *)master_hwaddr
.ifr_hwaddr
.sa_data
;
392 /* The family '1' is ARPHRD_ETHER for ethernet. */
393 if (master_family
!= 1 && !opt_f
) {
395 "Illegal operation: The specified master "
396 "interface '%s' is not ethernet-like.\n "
397 "This program is designed to work with "
398 "ethernet-like network interfaces.\n "
399 "Use the '-f' option to force the "
406 /* Check master's hw addr */
407 for (i
= 0; i
< 6; i
++) {
408 if (hwaddr
[i
] != 0) {
415 v_print("current hardware address of master '%s' "
416 "is %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x, "
419 hwaddr
[0], hwaddr
[1],
420 hwaddr
[2], hwaddr
[3],
421 hwaddr
[4], hwaddr
[5],
426 /* Accepts only one slave */
428 /* change active slave */
429 res
= get_slave_flags(slave_ifname
);
432 "Slave '%s': Error: get flags failed. "
437 res
= change_active(master_ifname
, slave_ifname
);
440 "Master '%s', Slave '%s': Error: "
441 "Change active failed\n",
442 master_ifname
, slave_ifname
);
445 /* Accept multiple slaves */
448 /* detach a slave interface from the master */
449 rv
= get_slave_flags(slave_ifname
);
451 /* Can't work with this slave. */
452 /* remember the error and skip it*/
454 "Slave '%s': Error: get flags "
455 "failed. Skipping\n",
460 rv
= release(master_ifname
, slave_ifname
);
463 "Master '%s', Slave '%s': Error: "
465 master_ifname
, slave_ifname
);
469 /* attach a slave interface to the master */
470 rv
= get_if_settings(slave_ifname
, slave_ifra
);
472 /* Can't work with this slave. */
473 /* remember the error and skip it*/
475 "Slave '%s': Error: get "
476 "settings failed: %s. "
478 slave_ifname
, strerror(rv
));
482 rv
= enslave(master_ifname
, slave_ifname
);
485 "Master '%s', Slave '%s': Error: "
487 master_ifname
, slave_ifname
);
491 } while ((slave_ifname
= *spp
++) != NULL
);
502 static short mif_flags
;
504 /* Get the inteface configuration from the kernel. */
505 static int if_getconfig(char *ifname
)
508 int metric
, mtu
; /* Parameters of the master interface. */
509 struct sockaddr dstaddr
, broadaddr
, netmask
;
510 unsigned char *hwaddr
;
512 strcpy(ifr
.ifr_name
, ifname
);
513 if (ioctl(skfd
, SIOCGIFFLAGS
, &ifr
) < 0)
515 mif_flags
= ifr
.ifr_flags
;
516 printf("The result of SIOCGIFFLAGS on %s is %x.\n",
517 ifname
, ifr
.ifr_flags
);
519 strcpy(ifr
.ifr_name
, ifname
);
520 if (ioctl(skfd
, SIOCGIFADDR
, &ifr
) < 0)
522 printf("The result of SIOCGIFADDR is %2.2x.%2.2x.%2.2x.%2.2x.\n",
523 ifr
.ifr_addr
.sa_data
[0], ifr
.ifr_addr
.sa_data
[1],
524 ifr
.ifr_addr
.sa_data
[2], ifr
.ifr_addr
.sa_data
[3]);
526 strcpy(ifr
.ifr_name
, ifname
);
527 if (ioctl(skfd
, SIOCGIFHWADDR
, &ifr
) < 0)
530 /* Gotta convert from 'char' to unsigned for printf(). */
531 hwaddr
= (unsigned char *)ifr
.ifr_hwaddr
.sa_data
;
532 printf("The result of SIOCGIFHWADDR is type %d "
533 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
534 ifr
.ifr_hwaddr
.sa_family
, hwaddr
[0], hwaddr
[1],
535 hwaddr
[2], hwaddr
[3], hwaddr
[4], hwaddr
[5]);
537 strcpy(ifr
.ifr_name
, ifname
);
538 if (ioctl(skfd
, SIOCGIFMETRIC
, &ifr
) < 0) {
541 metric
= ifr
.ifr_metric
;
543 strcpy(ifr
.ifr_name
, ifname
);
544 if (ioctl(skfd
, SIOCGIFMTU
, &ifr
) < 0)
549 strcpy(ifr
.ifr_name
, ifname
);
550 if (ioctl(skfd
, SIOCGIFDSTADDR
, &ifr
) < 0) {
551 memset(&dstaddr
, 0, sizeof(struct sockaddr
));
553 dstaddr
= ifr
.ifr_dstaddr
;
555 strcpy(ifr
.ifr_name
, ifname
);
556 if (ioctl(skfd
, SIOCGIFBRDADDR
, &ifr
) < 0) {
557 memset(&broadaddr
, 0, sizeof(struct sockaddr
));
559 broadaddr
= ifr
.ifr_broadaddr
;
561 strcpy(ifr
.ifr_name
, ifname
);
562 if (ioctl(skfd
, SIOCGIFNETMASK
, &ifr
) < 0) {
563 memset(&netmask
, 0, sizeof(struct sockaddr
));
565 netmask
= ifr
.ifr_netmask
;
570 static void if_print(char *ifname
)
577 if (ifname
== (char *)NULL
) {
578 ifc
.ifc_len
= sizeof(buff
);
580 if (ioctl(skfd
, SIOCGIFCONF
, &ifc
) < 0) {
581 perror("SIOCGIFCONF failed");
586 for (i
= ifc
.ifc_len
/ sizeof(struct ifreq
); --i
>= 0; ifr
++) {
587 if (if_getconfig(ifr
->ifr_name
) < 0) {
589 "%s: unknown interface.\n",
594 if (((mif_flags
& IFF_UP
) == 0) && !opt_a
) continue;
598 if (if_getconfig(ifname
) < 0) {
600 "%s: unknown interface.\n", ifname
);
605 static int get_drv_info(char *master_ifname
)
608 struct ethtool_drvinfo info
;
611 memset(&ifr
, 0, sizeof(ifr
));
612 strncpy(ifr
.ifr_name
, master_ifname
, IFNAMSIZ
);
613 ifr
.ifr_data
= (caddr_t
)&info
;
615 info
.cmd
= ETHTOOL_GDRVINFO
;
616 strncpy(info
.driver
, "ifenslave", 32);
617 snprintf(info
.fw_version
, 32, "%d", BOND_ABI_VERSION
);
619 if (ioctl(skfd
, SIOCETHTOOL
, &ifr
) < 0) {
620 if (errno
== EOPNOTSUPP
) {
625 v_print("Master '%s': Error: get bonding info failed %s\n",
626 master_ifname
, strerror(saved_errno
));
630 abi_ver
= strtoul(info
.fw_version
, &endptr
, 0);
632 v_print("Master '%s': Error: got invalid string as an ABI "
633 "version from the bonding module\n",
639 v_print("ABI ver is %d\n", abi_ver
);
644 static int change_active(char *master_ifname
, char *slave_ifname
)
649 if (!(slave_flags
.ifr_flags
& IFF_SLAVE
)) {
651 "Illegal operation: The specified slave interface "
652 "'%s' is not a slave\n",
657 strncpy(ifr
.ifr_name
, master_ifname
, IFNAMSIZ
);
658 strncpy(ifr
.ifr_slave
, slave_ifname
, IFNAMSIZ
);
659 if ((ioctl(skfd
, SIOCBONDCHANGEACTIVE
, &ifr
) < 0) &&
660 (ioctl(skfd
, BOND_CHANGE_ACTIVE_OLD
, &ifr
) < 0)) {
662 v_print("Master '%s': Error: SIOCBONDCHANGEACTIVE failed: "
664 master_ifname
, strerror(saved_errno
));
671 static int enslave(char *master_ifname
, char *slave_ifname
)
676 if (slave_flags
.ifr_flags
& IFF_SLAVE
) {
678 "Illegal operation: The specified slave interface "
679 "'%s' is already a slave\n",
684 res
= set_if_down(slave_ifname
, slave_flags
.ifr_flags
);
687 "Slave '%s': Error: bring interface down failed\n",
693 /* Older bonding versions would panic if the slave has no IP
694 * address, so get the IP setting from the master.
696 set_if_addr(master_ifname
, slave_ifname
);
698 res
= clear_if_addr(slave_ifname
);
701 "Slave '%s': Error: clear address failed\n",
707 if (master_mtu
.ifr_mtu
!= slave_mtu
.ifr_mtu
) {
708 res
= set_slave_mtu(slave_ifname
, master_mtu
.ifr_mtu
);
711 "Slave '%s': Error: set MTU failed\n",
718 /* Master already has an hwaddr
719 * so set it's hwaddr to the slave
722 /* The driver is using an old ABI, so
723 * the application sets the slave's
726 res
= set_slave_hwaddr(slave_ifname
,
727 &(master_hwaddr
.ifr_hwaddr
));
730 "Slave '%s': Error: set hw address "
736 /* For old ABI the application needs to bring the
739 res
= set_if_up(slave_ifname
, slave_flags
.ifr_flags
);
742 "Slave '%s': Error: bring interface "
748 /* The driver is using a new ABI,
749 * so the driver takes care of setting
750 * the slave's hwaddr and bringing
754 /* No hwaddr for master yet, so
755 * set the slave's hwaddr to it
758 /* For old ABI, the master needs to be
759 * down before setting it's hwaddr
761 res
= set_if_down(master_ifname
, master_flags
.ifr_flags
);
764 "Master '%s': Error: bring interface "
771 res
= set_master_hwaddr(master_ifname
,
772 &(slave_hwaddr
.ifr_hwaddr
));
775 "Master '%s': Error: set hw address "
782 /* For old ABI, bring the master
785 res
= set_if_up(master_ifname
, master_flags
.ifr_flags
);
788 "Master '%s': Error: bring interface "
791 goto undo_master_mac
;
798 /* Do the real thing */
799 strncpy(ifr
.ifr_name
, master_ifname
, IFNAMSIZ
);
800 strncpy(ifr
.ifr_slave
, slave_ifname
, IFNAMSIZ
);
801 if ((ioctl(skfd
, SIOCBONDENSLAVE
, &ifr
) < 0) &&
802 (ioctl(skfd
, BOND_ENSLAVE_OLD
, &ifr
) < 0)) {
804 v_print("Master '%s': Error: SIOCBONDENSLAVE failed: %s\n",
805 master_ifname
, strerror(saved_errno
));
810 goto undo_master_mac
;
815 /* rollback (best effort) */
817 set_master_hwaddr(master_ifname
, &(master_hwaddr
.ifr_hwaddr
));
821 set_slave_hwaddr(slave_ifname
, &(slave_hwaddr
.ifr_hwaddr
));
823 set_slave_mtu(slave_ifname
, slave_mtu
.ifr_mtu
);
827 static int release(char *master_ifname
, char *slave_ifname
)
832 if (!(slave_flags
.ifr_flags
& IFF_SLAVE
)) {
834 "Illegal operation: The specified slave interface "
835 "'%s' is not a slave\n",
840 strncpy(ifr
.ifr_name
, master_ifname
, IFNAMSIZ
);
841 strncpy(ifr
.ifr_slave
, slave_ifname
, IFNAMSIZ
);
842 if ((ioctl(skfd
, SIOCBONDRELEASE
, &ifr
) < 0) &&
843 (ioctl(skfd
, BOND_RELEASE_OLD
, &ifr
) < 0)) {
845 v_print("Master '%s': Error: SIOCBONDRELEASE failed: %s\n",
846 master_ifname
, strerror(saved_errno
));
848 } else if (abi_ver
< 1) {
849 /* The driver is using an old ABI, so we'll set the interface
850 * down to avoid any conflicts due to same MAC/IP
852 res
= set_if_down(slave_ifname
, slave_flags
.ifr_flags
);
855 "Slave '%s': Error: bring interface "
861 /* set to default mtu */
862 set_slave_mtu(slave_ifname
, 1500);
867 static int get_if_settings(char *ifname
, struct dev_ifr ifra
[])
872 for (i
= 0; ifra
[i
].req_ifr
; i
++) {
873 strncpy(ifra
[i
].req_ifr
->ifr_name
, ifname
, IFNAMSIZ
);
874 res
= ioctl(skfd
, ifra
[i
].req_type
, ifra
[i
].req_ifr
);
877 v_print("Interface '%s': Error: %s failed: %s\n",
878 ifname
, ifra
[i
].req_name
,
879 strerror(saved_errno
));
888 static int get_slave_flags(char *slave_ifname
)
892 strncpy(slave_flags
.ifr_name
, slave_ifname
, IFNAMSIZ
);
893 res
= ioctl(skfd
, SIOCGIFFLAGS
, &slave_flags
);
896 v_print("Slave '%s': Error: SIOCGIFFLAGS failed: %s\n",
897 slave_ifname
, strerror(saved_errno
));
899 v_print("Slave %s: flags %04X.\n",
900 slave_ifname
, slave_flags
.ifr_flags
);
906 static int set_master_hwaddr(char *master_ifname
, struct sockaddr
*hwaddr
)
908 unsigned char *addr
= (unsigned char *)hwaddr
->sa_data
;
912 strncpy(ifr
.ifr_name
, master_ifname
, IFNAMSIZ
);
913 memcpy(&(ifr
.ifr_hwaddr
), hwaddr
, sizeof(struct sockaddr
));
914 res
= ioctl(skfd
, SIOCSIFHWADDR
, &ifr
);
917 v_print("Master '%s': Error: SIOCSIFHWADDR failed: %s\n",
918 master_ifname
, strerror(saved_errno
));
921 v_print("Master '%s': hardware address set to "
922 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
923 master_ifname
, addr
[0], addr
[1], addr
[2],
924 addr
[3], addr
[4], addr
[5]);
930 static int set_slave_hwaddr(char *slave_ifname
, struct sockaddr
*hwaddr
)
932 unsigned char *addr
= (unsigned char *)hwaddr
->sa_data
;
936 strncpy(ifr
.ifr_name
, slave_ifname
, IFNAMSIZ
);
937 memcpy(&(ifr
.ifr_hwaddr
), hwaddr
, sizeof(struct sockaddr
));
938 res
= ioctl(skfd
, SIOCSIFHWADDR
, &ifr
);
942 v_print("Slave '%s': Error: SIOCSIFHWADDR failed: %s\n",
943 slave_ifname
, strerror(saved_errno
));
945 if (saved_errno
== EBUSY
) {
946 v_print(" The device is busy: it must be idle "
947 "before running this command.\n");
948 } else if (saved_errno
== EOPNOTSUPP
) {
949 v_print(" The device does not support setting "
951 " Your kernel likely does not support slave "
953 } else if (saved_errno
== EINVAL
) {
954 v_print(" The device's address type does not match "
955 "the master's address type.\n");
959 v_print("Slave '%s': hardware address set to "
960 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
961 slave_ifname
, addr
[0], addr
[1], addr
[2],
962 addr
[3], addr
[4], addr
[5]);
968 static int set_slave_mtu(char *slave_ifname
, int mtu
)
974 strncpy(ifr
.ifr_name
, slave_ifname
, IFNAMSIZ
);
976 res
= ioctl(skfd
, SIOCSIFMTU
, &ifr
);
979 v_print("Slave '%s': Error: SIOCSIFMTU failed: %s\n",
980 slave_ifname
, strerror(saved_errno
));
982 v_print("Slave '%s': MTU set to %d.\n", slave_ifname
, mtu
);
988 static int set_if_flags(char *ifname
, short flags
)
993 ifr
.ifr_flags
= flags
;
994 strncpy(ifr
.ifr_name
, ifname
, IFNAMSIZ
);
996 res
= ioctl(skfd
, SIOCSIFFLAGS
, &ifr
);
999 v_print("Interface '%s': Error: SIOCSIFFLAGS failed: %s\n",
1000 ifname
, strerror(saved_errno
));
1002 v_print("Interface '%s': flags set to %04X.\n", ifname
, flags
);
1008 static int set_if_up(char *ifname
, short flags
)
1010 return set_if_flags(ifname
, flags
| IFF_UP
);
1013 static int set_if_down(char *ifname
, short flags
)
1015 return set_if_flags(ifname
, flags
& ~IFF_UP
);
1018 static int clear_if_addr(char *ifname
)
1023 strncpy(ifr
.ifr_name
, ifname
, IFNAMSIZ
);
1024 ifr
.ifr_addr
.sa_family
= AF_INET
;
1025 memset(ifr
.ifr_addr
.sa_data
, 0, sizeof(ifr
.ifr_addr
.sa_data
));
1027 res
= ioctl(skfd
, SIOCSIFADDR
, &ifr
);
1029 saved_errno
= errno
;
1030 v_print("Interface '%s': Error: SIOCSIFADDR failed: %s\n",
1031 ifname
, strerror(saved_errno
));
1033 v_print("Interface '%s': address cleared\n", ifname
);
1039 static int set_if_addr(char *master_ifname
, char *slave_ifname
)
1043 unsigned char *ipaddr
;
1051 {"IFADDR", "addr", SIOCGIFADDR
, SIOCSIFADDR
},
1052 {"DSTADDR", "destination addr", SIOCGIFDSTADDR
, SIOCSIFDSTADDR
},
1053 {"BRDADDR", "broadcast addr", SIOCGIFBRDADDR
, SIOCSIFBRDADDR
},
1054 {"NETMASK", "netmask", SIOCGIFNETMASK
, SIOCSIFNETMASK
},
1058 for (i
= 0; ifra
[i
].req_name
; i
++) {
1059 strncpy(ifr
.ifr_name
, master_ifname
, IFNAMSIZ
);
1060 res
= ioctl(skfd
, ifra
[i
].g_ioctl
, &ifr
);
1062 int saved_errno
= errno
;
1064 v_print("Interface '%s': Error: SIOCG%s failed: %s\n",
1065 master_ifname
, ifra
[i
].req_name
,
1066 strerror(saved_errno
));
1068 ifr
.ifr_addr
.sa_family
= AF_INET
;
1069 memset(ifr
.ifr_addr
.sa_data
, 0,
1070 sizeof(ifr
.ifr_addr
.sa_data
));
1073 strncpy(ifr
.ifr_name
, slave_ifname
, IFNAMSIZ
);
1074 res
= ioctl(skfd
, ifra
[i
].s_ioctl
, &ifr
);
1076 int saved_errno
= errno
;
1078 v_print("Interface '%s': Error: SIOCS%s failed: %s\n",
1079 slave_ifname
, ifra
[i
].req_name
,
1080 strerror(saved_errno
));
1084 ipaddr
= (unsigned char *)ifr
.ifr_addr
.sa_data
;
1085 v_print("Interface '%s': set IP %s to %d.%d.%d.%d\n",
1086 slave_ifname
, ifra
[i
].desc
,
1087 ipaddr
[0], ipaddr
[1], ipaddr
[2], ipaddr
[3]);
1095 * version-control: t
1096 * kept-new-versions: 5
1100 * compile-command: "gcc -Wall -Wstrict-prototypes -O -I/usr/src/linux/include ifenslave.c -o ifenslave"