blob: 16fcd54f1054918a208614ef6482fc9a231b72c0 [file] [log] [blame]
Denis Vlasenko06aed432008-02-26 18:25:24 +00001/* Mode: C;
2 *
3 * Mini ifenslave implementation for busybox
4 * Copyright (C) 2005 by Marc Leeman <marc.leeman@barco.com>
5 *
6 * ifenslave.c: Configure network interfaces for parallel routing.
7 *
Denis Vlasenkoc6938402008-03-24 02:18:03 +00008 * This program controls the Linux implementation of running multiple
9 * network interfaces in parallel.
Denis Vlasenko06aed432008-02-26 18:25:24 +000010 *
Denis Vlasenkoc6938402008-03-24 02:18:03 +000011 * Author: Donald Becker <becker@cesdis.gsfc.nasa.gov>
12 * Copyright 1994-1996 Donald Becker
Denis Vlasenko06aed432008-02-26 18:25:24 +000013 *
Denis Vlasenkoc6938402008-03-24 02:18:03 +000014 * This program is free software; you can redistribute it
15 * and/or modify it under the terms of the GNU General Public
16 * License as published by the Free Software Foundation.
Denis Vlasenko06aed432008-02-26 18:25:24 +000017 *
Denis Vlasenkoc6938402008-03-24 02:18:03 +000018 * The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
19 * Center of Excellence in Space Data and Information Sciences
20 * Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
Denis Vlasenko06aed432008-02-26 18:25:24 +000021 *
22 * Changes :
23 * - 2000/10/02 Willy Tarreau <willy at meta-x.org> :
24 * - few fixes. Master's MAC address is now correctly taken from
25 * the first device when not previously set ;
26 * - detach support : call BOND_RELEASE to detach an enslaved interface.
27 * - give a mini-howto from command-line help : # ifenslave -h
28 *
29 * - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :
30 * - Master is now brought down before setting the MAC address. In
31 * the 2.4 kernel you can't change the MAC address while the device is
32 * up because you get EBUSY.
33 *
34 * - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>
35 * - Added the ability to change the active interface on a mode 1 bond
36 * at runtime.
37 *
38 * - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :
39 * - No longer set the MAC address of the master. The bond device will
40 * take care of this itself
41 * - Try the SIOC*** versions of the bonding ioctls before using the
42 * old versions
43 * - 2002/02/18 Erik Habbinga <erik_habbinga @ hp dot com> :
44 * - ifr2.ifr_flags was not initialized in the hwaddr_notset case,
45 * SIOCGIFFLAGS now called before hwaddr_notset test
46 *
47 * - 2002/10/31 Tony Cureington <tony.cureington * hp_com> :
48 * - If the master does not have a hardware address when the first slave
49 * is enslaved, the master is assigned the hardware address of that
50 * slave - there is a comment in bonding.c stating "ifenslave takes
51 * care of this now." This corrects the problem of slaves having
52 * different hardware addresses in active-backup mode when
53 * multiple interfaces are specified on a single ifenslave command
54 * (ifenslave bond0 eth0 eth1).
55 *
56 * - 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
57 * Shmulik Hen <shmulik.hen at intel dot com>
58 * - Moved setting the slave's mac address and openning it, from
59 * the application to the driver. This enables support of modes
60 * that need to use the unique mac address of each slave.
61 * The driver also takes care of closing the slave and restoring its
62 * original mac address upon release.
63 * In addition, block possibility of enslaving before the master is up.
64 * This prevents putting the system in an undefined state.
65 *
66 * - 2003/05/01 - Amir Noam <amir.noam at intel dot com>
67 * - Added ABI version control to restore compatibility between
68 * new/old ifenslave and new/old bonding.
69 * - Prevent adding an adapter that is already a slave.
70 * Fixes the problem of stalling the transmission and leaving
71 * the slave in a down state.
72 *
73 * - 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
74 * - Prevent enslaving if the bond device is down.
75 * Fixes the problem of leaving the system in unstable state and
76 * halting when trying to remove the module.
77 * - Close socket on all abnormal exists.
78 * - Add versioning scheme that follows that of the bonding driver.
79 * current version is 1.0.0 as a base line.
80 *
81 * - 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com>
Denis Vlasenkoc6938402008-03-24 02:18:03 +000082 * - ifenslave -c was broken; it's now fixed
83 * - Fixed problem with routes vanishing from master during enslave
84 * processing.
Denis Vlasenko06aed432008-02-26 18:25:24 +000085 *
86 * - 2003/05/27 - Amir Noam <amir.noam at intel dot com>
Denis Vlasenkoc6938402008-03-24 02:18:03 +000087 * - Fix backward compatibility issues:
88 * For drivers not using ABI versions, slave was set down while
89 * it should be left up before enslaving.
90 * Also, master was not set down and the default set_mac_address()
91 * would fail and generate an error message in the system log.
92 * - For opt_c: slave should not be set to the master's setting
93 * while it is running. It was already set during enslave. To
94 * simplify things, it is now handeled separately.
Denis Vlasenko06aed432008-02-26 18:25:24 +000095 *
96 * - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
Denis Vlasenkoc6938402008-03-24 02:18:03 +000097 * - Code cleanup and style changes
98 * set version to 1.1.0
Denis Vlasenko06aed432008-02-26 18:25:24 +000099 */
100
101#include "libbb.h"
102
Denis Vlasenkoee9deb82008-09-06 14:52:28 +0000103/* #include <net/if.h> - no. linux/if_bonding.h pulls in linux/if.h */
Denis Vlasenko06aed432008-02-26 18:25:24 +0000104#include <net/if_arp.h>
105#include <linux/if_bonding.h>
106#include <linux/sockios.h>
107
Denis Vlasenkoee9deb82008-09-06 14:52:28 +0000108#ifndef IFNAMSIZ
109#define IFNAMSIZ 16
110#endif
111
Denis Vlasenkoee34ebe2008-09-06 14:42:27 +0000112typedef uint64_t u64; /* hack, so we may include kernel's ethtool.h */
113typedef uint32_t u32; /* ditto */
114typedef uint16_t u16; /* ditto */
115typedef uint8_t u8; /* ditto */
Denis Vlasenko06aed432008-02-26 18:25:24 +0000116#include <linux/ethtool.h>
117
118
119struct dev_data {
120 struct ifreq mtu, flags, hwaddr;
121};
122
123
Denis Vlasenko08768222008-06-07 22:13:04 +0000124enum { skfd = 3 }; /* AF_INET socket for ioctl() calls. */
Denis Vlasenko06aed432008-02-26 18:25:24 +0000125struct globals {
126 unsigned abi_ver; /* userland - kernel ABI version */
127 smallint hwaddr_set; /* Master's hwaddr is set */
128 struct dev_data master;
129 struct dev_data slave;
130};
131#define G (*ptr_to_globals)
132#define abi_ver (G.abi_ver )
133#define hwaddr_set (G.hwaddr_set)
134#define master (G.master )
135#define slave (G.slave )
136#define INIT_G() do { \
Denis Vlasenko2570b2e2008-03-28 01:00:09 +0000137 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
Denis Vlasenko06aed432008-02-26 18:25:24 +0000138} while (0)
139
140
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000141/* NOINLINEs are placed where it results in smaller code (gcc 4.3.1) */
Denis Vlasenko06aed432008-02-26 18:25:24 +0000142
Denis Vlasenko08768222008-06-07 22:13:04 +0000143static int ioctl_on_skfd(unsigned request, struct ifreq *ifr)
144{
145 return ioctl(skfd, request, ifr);
146}
147
148static int set_ifrname_and_do_ioctl(unsigned request, struct ifreq *ifr, const char *ifname)
149{
Denis Vlasenko7049ff82008-06-25 09:53:17 +0000150 strncpy_IFNAMSIZ(ifr->ifr_name, ifname);
Denis Vlasenko08768222008-06-07 22:13:04 +0000151 return ioctl_on_skfd(request, ifr);
152}
153
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000154static int get_if_settings(char *ifname, struct dev_data *dd)
Denis Vlasenko06aed432008-02-26 18:25:24 +0000155{
Denis Vlasenko06aed432008-02-26 18:25:24 +0000156 int res;
Denis Vlasenko06aed432008-02-26 18:25:24 +0000157
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000158 res = set_ifrname_and_do_ioctl(SIOCGIFMTU, &dd->mtu, ifname);
159 res |= set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &dd->flags, ifname);
160 res |= set_ifrname_and_do_ioctl(SIOCGIFHWADDR, &dd->hwaddr, ifname);
Denis Vlasenko06aed432008-02-26 18:25:24 +0000161
162 return res;
163}
164
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000165static int get_slave_flags(char *slave_ifname)
166{
167 return set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &slave.flags, slave_ifname);
168}
169
170static int set_hwaddr(char *ifname, struct sockaddr *hwaddr)
Denis Vlasenko06aed432008-02-26 18:25:24 +0000171{
172 struct ifreq ifr;
Denis Vlasenko06aed432008-02-26 18:25:24 +0000173
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000174 memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(*hwaddr));
175 return set_ifrname_and_do_ioctl(SIOCSIFHWADDR, &ifr, ifname);
176}
177
178static int set_mtu(char *ifname, int mtu)
179{
180 struct ifreq ifr;
181
182 ifr.ifr_mtu = mtu;
183 return set_ifrname_and_do_ioctl(SIOCSIFMTU, &ifr, ifname);
184}
185
186static int set_if_flags(char *ifname, int flags)
187{
188 struct ifreq ifr;
189
190 ifr.ifr_flags = flags;
191 return set_ifrname_and_do_ioctl(SIOCSIFFLAGS, &ifr, ifname);
192}
193
194static int set_if_up(char *ifname, int flags)
195{
196 int res = set_if_flags(ifname, flags | IFF_UP);
197 if (res)
198 bb_perror_msg("%s: can't up", ifname);
199 return res;
200}
201
202static int set_if_down(char *ifname, int flags)
203{
204 int res = set_if_flags(ifname, flags & ~IFF_UP);
205 if (res)
206 bb_perror_msg("%s: can't down", ifname);
207 return res;
208}
209
210static int clear_if_addr(char *ifname)
211{
212 struct ifreq ifr;
213
214 ifr.ifr_addr.sa_family = AF_INET;
215 memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
216 return set_ifrname_and_do_ioctl(SIOCSIFADDR, &ifr, ifname);
217}
218
219static int set_if_addr(char *master_ifname, char *slave_ifname)
220{
221#if (SIOCGIFADDR | SIOCSIFADDR \
222 | SIOCGIFDSTADDR | SIOCSIFDSTADDR \
223 | SIOCGIFBRDADDR | SIOCSIFBRDADDR \
224 | SIOCGIFNETMASK | SIOCSIFNETMASK) <= 0xffff
225#define INT uint16_t
226#else
227#define INT int
228#endif
229 static const struct {
230 INT g_ioctl;
231 INT s_ioctl;
232 } ifra[] = {
233 { SIOCGIFADDR, SIOCSIFADDR },
234 { SIOCGIFDSTADDR, SIOCSIFDSTADDR },
235 { SIOCGIFBRDADDR, SIOCSIFBRDADDR },
236 { SIOCGIFNETMASK, SIOCSIFNETMASK },
237 };
238
239 struct ifreq ifr;
240 int res;
241 unsigned i;
242
243 for (i = 0; i < ARRAY_SIZE(ifra); i++) {
244 res = set_ifrname_and_do_ioctl(ifra[i].g_ioctl, &ifr, master_ifname);
245 if (res < 0) {
246 ifr.ifr_addr.sa_family = AF_INET;
247 memset(ifr.ifr_addr.sa_data, 0,
248 sizeof(ifr.ifr_addr.sa_data));
249 }
250
251 res = set_ifrname_and_do_ioctl(ifra[i].s_ioctl, &ifr, slave_ifname);
252 if (res < 0)
253 return res;
Denis Vlasenko06aed432008-02-26 18:25:24 +0000254 }
255
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000256 return 0;
Denis Vlasenko06aed432008-02-26 18:25:24 +0000257}
258
259static void change_active(char *master_ifname, char *slave_ifname)
260{
261 struct ifreq ifr;
262
263 if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
Denis Vlasenko048897c2008-06-08 08:01:12 +0000264 bb_error_msg_and_die("%s is not a slave", slave_ifname);
Denis Vlasenko06aed432008-02-26 18:25:24 +0000265 }
266
Denis Vlasenko01eaee92008-04-21 02:21:45 +0000267 strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
Denis Vlasenko08768222008-06-07 22:13:04 +0000268 if (set_ifrname_and_do_ioctl(SIOCBONDCHANGEACTIVE, &ifr, master_ifname)
269 && ioctl_on_skfd(BOND_CHANGE_ACTIVE_OLD, &ifr)
Denis Vlasenko06aed432008-02-26 18:25:24 +0000270 ) {
271 bb_perror_msg_and_die(
272 "master %s, slave %s: can't "
273 "change active",
274 master_ifname, slave_ifname);
275 }
276}
277
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000278static NOINLINE int enslave(char *master_ifname, char *slave_ifname)
Denis Vlasenko06aed432008-02-26 18:25:24 +0000279{
280 struct ifreq ifr;
281 int res;
282
283 if (slave.flags.ifr_flags & IFF_SLAVE) {
284 bb_error_msg(
285 "%s is already a slave",
286 slave_ifname);
287 return 1;
288 }
289
290 res = set_if_down(slave_ifname, slave.flags.ifr_flags);
291 if (res)
292 return res;
293
294 if (abi_ver < 2) {
295 /* Older bonding versions would panic if the slave has no IP
296 * address, so get the IP setting from the master.
297 */
298 res = set_if_addr(master_ifname, slave_ifname);
299 if (res) {
300 bb_perror_msg("%s: can't set address", slave_ifname);
301 return res;
302 }
303 } else {
304 res = clear_if_addr(slave_ifname);
305 if (res) {
306 bb_perror_msg("%s: can't clear address", slave_ifname);
307 return res;
308 }
309 }
310
311 if (master.mtu.ifr_mtu != slave.mtu.ifr_mtu) {
Denis Vlasenko08768222008-06-07 22:13:04 +0000312 res = set_mtu(slave_ifname, master.mtu.ifr_mtu);
Denis Vlasenko06aed432008-02-26 18:25:24 +0000313 if (res) {
314 bb_perror_msg("%s: can't set MTU", slave_ifname);
315 return res;
316 }
317 }
318
319 if (hwaddr_set) {
320 /* Master already has an hwaddr
321 * so set it's hwaddr to the slave
322 */
323 if (abi_ver < 1) {
324 /* The driver is using an old ABI, so
325 * the application sets the slave's
326 * hwaddr
327 */
Denis Vlasenko08768222008-06-07 22:13:04 +0000328 if (set_hwaddr(slave_ifname, &(master.hwaddr.ifr_hwaddr))) {
Denis Vlasenko06aed432008-02-26 18:25:24 +0000329 bb_perror_msg("%s: can't set hw address",
330 slave_ifname);
331 goto undo_mtu;
332 }
333
334 /* For old ABI the application needs to bring the
335 * slave back up
336 */
Denis Vlasenko08768222008-06-07 22:13:04 +0000337 if (set_if_up(slave_ifname, slave.flags.ifr_flags))
Denis Vlasenko06aed432008-02-26 18:25:24 +0000338 goto undo_slave_mac;
339 }
340 /* The driver is using a new ABI,
341 * so the driver takes care of setting
342 * the slave's hwaddr and bringing
343 * it up again
344 */
345 } else {
346 /* No hwaddr for master yet, so
347 * set the slave's hwaddr to it
348 */
349 if (abi_ver < 1) {
350 /* For old ABI, the master needs to be
351 * down before setting it's hwaddr
352 */
Denis Vlasenko08768222008-06-07 22:13:04 +0000353 if (set_if_down(master_ifname, master.flags.ifr_flags))
Denis Vlasenko06aed432008-02-26 18:25:24 +0000354 goto undo_mtu;
355 }
356
Denis Vlasenko08768222008-06-07 22:13:04 +0000357 if (set_hwaddr(master_ifname, &(slave.hwaddr.ifr_hwaddr))) {
Denis Vlasenko06aed432008-02-26 18:25:24 +0000358 bb_error_msg("%s: can't set hw address",
359 master_ifname);
360 goto undo_mtu;
361 }
362
363 if (abi_ver < 1) {
364 /* For old ABI, bring the master
365 * back up
366 */
Denis Vlasenko08768222008-06-07 22:13:04 +0000367 if (set_if_up(master_ifname, master.flags.ifr_flags))
Denis Vlasenko06aed432008-02-26 18:25:24 +0000368 goto undo_master_mac;
369 }
370
371 hwaddr_set = 1;
372 }
373
374 /* Do the real thing */
Denis Vlasenko01eaee92008-04-21 02:21:45 +0000375 strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
Denis Vlasenko08768222008-06-07 22:13:04 +0000376 if (set_ifrname_and_do_ioctl(SIOCBONDENSLAVE, &ifr, master_ifname)
377 && ioctl_on_skfd(BOND_ENSLAVE_OLD, &ifr)
Denis Vlasenko06aed432008-02-26 18:25:24 +0000378 ) {
Denis Vlasenko06aed432008-02-26 18:25:24 +0000379 goto undo_master_mac;
Denis Vlasenko08768222008-06-07 22:13:04 +0000380 }
Denis Vlasenko06aed432008-02-26 18:25:24 +0000381
382 return 0;
383
384/* rollback (best effort) */
385 undo_master_mac:
Denis Vlasenko08768222008-06-07 22:13:04 +0000386 set_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr));
Denis Vlasenko06aed432008-02-26 18:25:24 +0000387 hwaddr_set = 0;
388 goto undo_mtu;
Denis Vlasenko08768222008-06-07 22:13:04 +0000389
Denis Vlasenko06aed432008-02-26 18:25:24 +0000390 undo_slave_mac:
Denis Vlasenko08768222008-06-07 22:13:04 +0000391 set_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr));
Denis Vlasenko06aed432008-02-26 18:25:24 +0000392 undo_mtu:
Denis Vlasenko08768222008-06-07 22:13:04 +0000393 set_mtu(slave_ifname, slave.mtu.ifr_mtu);
394 return 1;
Denis Vlasenko06aed432008-02-26 18:25:24 +0000395}
396
397static int release(char *master_ifname, char *slave_ifname)
398{
399 struct ifreq ifr;
400 int res = 0;
401
402 if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
Denis Vlasenko048897c2008-06-08 08:01:12 +0000403 bb_error_msg("%s is not a slave", slave_ifname);
Denis Vlasenko06aed432008-02-26 18:25:24 +0000404 return 1;
405 }
406
Denis Vlasenko01eaee92008-04-21 02:21:45 +0000407 strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
Denis Vlasenko08768222008-06-07 22:13:04 +0000408 if (set_ifrname_and_do_ioctl(SIOCBONDRELEASE, &ifr, master_ifname) < 0
409 && ioctl_on_skfd(BOND_RELEASE_OLD, &ifr) < 0
Denis Vlasenko06aed432008-02-26 18:25:24 +0000410 ) {
411 return 1;
412 }
413 if (abi_ver < 1) {
414 /* The driver is using an old ABI, so we'll set the interface
415 * down to avoid any conflicts due to same MAC/IP
416 */
417 res = set_if_down(slave_ifname, slave.flags.ifr_flags);
418 }
419
420 /* set to default mtu */
Denis Vlasenko08768222008-06-07 22:13:04 +0000421 set_mtu(slave_ifname, 1500);
Denis Vlasenko06aed432008-02-26 18:25:24 +0000422
423 return res;
424}
425
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000426static NOINLINE void get_drv_info(char *master_ifname)
Denis Vlasenko06aed432008-02-26 18:25:24 +0000427{
428 struct ifreq ifr;
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000429 struct ethtool_drvinfo info;
Denis Vlasenko06aed432008-02-26 18:25:24 +0000430
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000431 memset(&ifr, 0, sizeof(ifr));
432 ifr.ifr_data = (caddr_t)&info;
433 info.cmd = ETHTOOL_GDRVINFO;
Denis Vlasenkob5975642008-06-08 00:24:43 +0000434 /* both fields are 32 bytes long (long enough) */
435 strcpy(info.driver, "ifenslave");
436 strcpy(info.fw_version, utoa(BOND_ABI_VERSION));
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000437 if (set_ifrname_and_do_ioctl(SIOCETHTOOL, &ifr, master_ifname) < 0) {
438 if (errno == EOPNOTSUPP)
439 return;
440 bb_perror_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
Denis Vlasenko06aed432008-02-26 18:25:24 +0000441 }
442
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000443 abi_ver = bb_strtou(info.fw_version, NULL, 0);
444 if (errno)
445 bb_error_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
446}
447
448int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000449int ifenslave_main(int argc UNUSED_PARAM, char **argv)
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000450{
451 char *master_ifname, *slave_ifname;
452 int rv;
453 int res;
454 unsigned opt;
455 enum {
456 OPT_c = (1 << 0),
457 OPT_d = (1 << 1),
458 OPT_f = (1 << 2),
459 };
Denys Vlasenkof3b92d32009-06-19 12:10:38 +0200460#if ENABLE_LONG_OPTS
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000461 static const char ifenslave_longopts[] ALIGN1 =
Denis Vlasenko048897c2008-06-08 08:01:12 +0000462 "change-active\0" No_argument "c"
463 "detach\0" No_argument "d"
464 "force\0" No_argument "f"
465 /* "all-interfaces\0" No_argument "a" */
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000466 ;
467
468 applet_long_options = ifenslave_longopts;
469#endif
470 INIT_G();
471
Denis Vlasenko048897c2008-06-08 08:01:12 +0000472 opt = getopt32(argv, "cdfa");
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000473 argv += optind;
Denis Vlasenko048897c2008-06-08 08:01:12 +0000474 if (opt & (opt-1)) /* Only one option can be given */
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000475 bb_show_usage();
476
477 master_ifname = *argv++;
478
479 /* No interface names - show all interfaces. */
480 if (!master_ifname) {
481 display_interfaces(NULL);
482 return EXIT_SUCCESS;
483 }
484
485 /* Open a basic socket */
486 xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), skfd);
487
488 /* Exchange abi version with bonding module */
489 get_drv_info(master_ifname);
490
491 slave_ifname = *argv++;
492 if (!slave_ifname) {
493 if (opt & (OPT_d|OPT_c)) {
494 /* --change or --detach, and no slaves given -
495 * show all interfaces. */
496 display_interfaces(slave_ifname /* == NULL */);
497 return 2; /* why 2? */
498 }
499 /* A single arg means show the
500 * configuration for this interface
501 */
502 display_interfaces(master_ifname);
503 return EXIT_SUCCESS;
504 }
505
Denis Vlasenko048897c2008-06-08 08:01:12 +0000506 if (get_if_settings(master_ifname, &master)) {
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000507 /* Probably a good reason not to go on */
508 bb_perror_msg_and_die("%s: can't get settings", master_ifname);
509 }
510
Denis Vlasenko048897c2008-06-08 08:01:12 +0000511 /* Check if master is indeed a master;
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000512 * if not then fail any operation
513 */
514 if (!(master.flags.ifr_flags & IFF_MASTER))
515 bb_error_msg_and_die("%s is not a master", master_ifname);
516
Denis Vlasenko048897c2008-06-08 08:01:12 +0000517 /* Check if master is up; if not then fail any operation */
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000518 if (!(master.flags.ifr_flags & IFF_UP))
519 bb_error_msg_and_die("%s is not up", master_ifname);
520
Denis Vlasenko048897c2008-06-08 08:01:12 +0000521#ifdef WHY_BOTHER
522 /* Neither -c[hange] nor -d[etach] -> it's "enslave" then;
523 * and -f[orce] is not there too. Check that it's ethernet. */
524 if (!(opt & (OPT_d|OPT_c|OPT_f)) {
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000525 /* The family '1' is ARPHRD_ETHER for ethernet. */
526 if (master.hwaddr.ifr_hwaddr.sa_family != 1) {
527 bb_error_msg_and_die(
528 "%s is not ethernet-like (-f overrides)",
529 master_ifname);
530 }
531 }
Denis Vlasenko048897c2008-06-08 08:01:12 +0000532#endif
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000533
534 /* Accepts only one slave */
535 if (opt & OPT_c) {
Denis Vlasenko048897c2008-06-08 08:01:12 +0000536 /* Change active slave */
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000537 if (get_slave_flags(slave_ifname)) {
538 bb_perror_msg_and_die(
539 "%s: can't get flags", slave_ifname);
540 }
541 change_active(master_ifname, slave_ifname);
542 return EXIT_SUCCESS;
543 }
544
Denis Vlasenko048897c2008-06-08 08:01:12 +0000545 /* Accepts multiple slaves */
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000546 res = 0;
547 do {
548 if (opt & OPT_d) {
Denis Vlasenko048897c2008-06-08 08:01:12 +0000549 /* Detach a slave interface from the master */
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000550 rv = get_slave_flags(slave_ifname);
551 if (rv) {
552 /* Can't work with this slave, */
553 /* remember the error and skip it */
554 bb_perror_msg(
555 "skipping %s: can't get flags",
556 slave_ifname);
557 res = rv;
558 continue;
559 }
560 rv = release(master_ifname, slave_ifname);
561 if (rv) {
Denis Vlasenko048897c2008-06-08 08:01:12 +0000562 bb_perror_msg("can't release %s from %s",
563 slave_ifname, master_ifname);
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000564 res = rv;
565 }
566 } else {
Denis Vlasenko048897c2008-06-08 08:01:12 +0000567 /* Attach a slave interface to the master */
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000568 rv = get_if_settings(slave_ifname, &slave);
569 if (rv) {
570 /* Can't work with this slave, */
571 /* remember the error and skip it */
572 bb_perror_msg(
573 "skipping %s: can't get settings",
574 slave_ifname);
575 res = rv;
576 continue;
577 }
578 rv = enslave(master_ifname, slave_ifname);
579 if (rv) {
Denis Vlasenko048897c2008-06-08 08:01:12 +0000580 bb_perror_msg("can't enslave %s to %s",
581 slave_ifname, master_ifname);
Denis Vlasenkoc8fa04f2008-06-07 22:14:25 +0000582 res = rv;
583 }
584 }
585 } while ((slave_ifname = *argv++) != NULL);
586
587 if (ENABLE_FEATURE_CLEAN_UP) {
588 close(skfd);
589 }
590
591 return res;
Denis Vlasenko06aed432008-02-26 18:25:24 +0000592}