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authorDenis Vlasenko <vda.linux@googlemail.com>2008-02-26 18:25:24 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-02-26 18:25:24 +0000
commit06aed4316e1f486f78c6487181c75cb22a70c639 (patch)
tree65a21a2b40b877b985bfe746df01358546cbf878 /networking/ifenslave.c
parent04bb2d2d06a87b08743ee997fcd8465bfed809d1 (diff)
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ifenslave: new applet. closes bug 115.
Diffstat (limited to 'networking/ifenslave.c')
-rw-r--r--networking/ifenslave.c621
1 files changed, 621 insertions, 0 deletions
diff --git a/networking/ifenslave.c b/networking/ifenslave.c
new file mode 100644
index 000000000..774d7c2d2
--- /dev/null
+++ b/networking/ifenslave.c
@@ -0,0 +1,621 @@
1/* 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 *
8 * This program controls the Linux implementation of running multiple
9 * network interfaces in parallel.
10 *
11 * Author: Donald Becker <becker@cesdis.gsfc.nasa.gov>
12 * Copyright 1994-1996 Donald Becker
13 *
14 * 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.
17 *
18 * 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
21 *
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>
82 * - ifenslave -c was broken; it's now fixed
83 * - Fixed problem with routes vanishing from master during enslave
84 * processing.
85 *
86 * - 2003/05/27 - Amir Noam <amir.noam at intel dot com>
87 * - 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.
95 *
96 * - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
97 * - Code cleanup and style changes
98 * set version to 1.1.0
99 */
100
101#include "libbb.h"
102
103#include <net/if_arp.h>
104#include <linux/if_bonding.h>
105#include <linux/sockios.h>
106
107typedef unsigned long long u64; /* hack, so we may include kernel's ethtool.h */
108typedef uint32_t u32; /* ditto */
109typedef uint16_t u16; /* ditto */
110typedef uint8_t u8; /* ditto */
111#include <linux/ethtool.h>
112
113
114struct dev_data {
115 struct ifreq mtu, flags, hwaddr;
116};
117
118
119enum { skfd = 3 }; /* AF_INET socket for ioctl() calls.*/
120struct globals {
121 unsigned abi_ver; /* userland - kernel ABI version */
122 smallint hwaddr_set; /* Master's hwaddr is set */
123 struct dev_data master;
124 struct dev_data slave;
125};
126#define G (*ptr_to_globals)
127#define abi_ver (G.abi_ver )
128#define hwaddr_set (G.hwaddr_set)
129#define master (G.master )
130#define slave (G.slave )
131#define INIT_G() do { \
132 PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
133} while (0)
134
135
136static void get_drv_info(char *master_ifname);
137static int get_if_settings(char *ifname, struct dev_data *dd);
138static int get_slave_flags(char *slave_ifname);
139static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr);
140static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr);
141static int set_slave_mtu(char *slave_ifname, int mtu);
142static int set_if_flags(char *ifname, short flags);
143static int set_if_up(char *ifname, short flags);
144static int set_if_down(char *ifname, short flags);
145static int clear_if_addr(char *ifname);
146static int set_if_addr(char *master_ifname, char *slave_ifname);
147static void change_active(char *master_ifname, char *slave_ifname);
148static int enslave(char *master_ifname, char *slave_ifname);
149static int release(char *master_ifname, char *slave_ifname);
150
151
152int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
153int ifenslave_main(int argc, char **argv)
154{
155 char *master_ifname, *slave_ifname;
156 int rv;
157 int res;
158 unsigned opt;
159 enum {
160 OPT_c = (1 << 0),
161 OPT_d = (1 << 1),
162 OPT_f = (1 << 2),
163 };
164#if ENABLE_GETOPT_LONG
165 static const char ifenslave_longopts[] ALIGN1 =
166 "change-active" No_argument "c"
167 "detach" No_argument "d"
168 "force" No_argument "f"
169 ;
170
171 applet_long_options = ifenslave_longopts;
172#endif
173 opt = getopt32(argv, "cdf");
174 argv += optind;
175 if (opt & (opt-1)) /* options check */
176 bb_show_usage();
177
178 /* Copy the interface name */
179 master_ifname = *argv++;
180
181 /* No remaining args means show all interfaces. */
182 if (!master_ifname) {
183 display_interfaces(NULL);
184 return EXIT_SUCCESS;
185 }
186
187 /* Open a basic socket */
188 xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), skfd);
189
190 /* exchange abi version with bonding module */
191 get_drv_info(master_ifname);
192
193 slave_ifname = *argv++;
194 if (!slave_ifname) {
195 if (opt & (OPT_d|OPT_c)) {
196 display_interfaces(slave_ifname);
197 return 2; /* why? */
198 }
199 /* A single arg means show the
200 * configuration for this interface
201 */
202 display_interfaces(master_ifname);
203 return EXIT_SUCCESS;
204 }
205
206 res = get_if_settings(master_ifname, &master);
207 if (res) {
208 /* Probably a good reason not to go on */
209 bb_perror_msg_and_die("%s: can't get settings", master_ifname);
210 }
211
212 /* check if master is indeed a master;
213 * if not then fail any operation
214 */
215 if (!(master.flags.ifr_flags & IFF_MASTER))
216 bb_error_msg_and_die("%s is not a master", master_ifname);
217
218 /* check if master is up; if not then fail any operation */
219 if (!(master.flags.ifr_flags & IFF_UP))
220 bb_error_msg_and_die("%s is not up", master_ifname);
221
222 /* Only for enslaving */
223 if (!(opt & (OPT_c|OPT_d))) {
224 sa_family_t master_family = master.hwaddr.ifr_hwaddr.sa_family;
225
226 /* The family '1' is ARPHRD_ETHER for ethernet. */
227 if (master_family != 1 && !(opt & OPT_f)) {
228 bb_error_msg_and_die(
229 "%s is not ethernet-like (-f overrides)",
230 master_ifname);
231 }
232 }
233
234 /* Accepts only one slave */
235 if (opt & OPT_c) {
236 /* change active slave */
237 res = get_slave_flags(slave_ifname);
238 if (res) {
239 bb_perror_msg_and_die(
240 "%s: can't get flags", slave_ifname);
241 }
242 change_active(master_ifname, slave_ifname);
243 return EXIT_SUCCESS;
244 }
245
246 /* Accept multiple slaves */
247 res = 0;
248 do {
249 if (opt & OPT_d) {
250 /* detach a slave interface from the master */
251 rv = get_slave_flags(slave_ifname);
252 if (rv) {
253 /* Can't work with this slave. */
254 /* remember the error and skip it*/
255 bb_perror_msg(
256 "skipping %s: can't get flags",
257 slave_ifname);
258 res = rv;
259 continue;
260 }
261 rv = release(master_ifname, slave_ifname);
262 if (rv) {
263 bb_perror_msg(
264 "master %s, slave %s: "
265 "can't release",
266 master_ifname, slave_ifname);
267 res = rv;
268 }
269 } else {
270 /* attach a slave interface to the master */
271 rv = get_if_settings(slave_ifname, &slave);
272 if (rv) {
273 /* Can't work with this slave. */
274 /* remember the error and skip it*/
275 bb_perror_msg(
276 "skipping %s: can't get settings",
277 slave_ifname);
278 res = rv;
279 continue;
280 }
281 rv = enslave(master_ifname, slave_ifname);
282 if (rv) {
283 bb_perror_msg(
284 "master %s, slave %s: "
285 "can't enslave",
286 master_ifname, slave_ifname);
287 res = rv;
288 }
289 }
290 } while ((slave_ifname = *argv++) != NULL);
291
292 if (ENABLE_FEATURE_CLEAN_UP) {
293 close(skfd);
294 }
295
296 return res;
297}
298
299static void get_drv_info(char *master_ifname)
300{
301 struct ifreq ifr;
302 struct ethtool_drvinfo info;
303
304 memset(&ifr, 0, sizeof(ifr));
305 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
306 ifr.ifr_data = (caddr_t)&info;
307
308 info.cmd = ETHTOOL_GDRVINFO;
309 strncpy(info.driver, "ifenslave", 32);
310 snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION);
311
312 if (ioctl(skfd, SIOCETHTOOL, &ifr) < 0) {
313 if (errno == EOPNOTSUPP)
314 return;
315 bb_perror_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
316 }
317
318 abi_ver = bb_strtou(info.fw_version, NULL, 0);
319 if (errno)
320 bb_error_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
321
322 return;
323}
324
325static void change_active(char *master_ifname, char *slave_ifname)
326{
327 struct ifreq ifr;
328
329 if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
330 bb_error_msg_and_die(
331 "%s is not a slave",
332 slave_ifname);
333 }
334
335 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
336 strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
337 if (ioctl(skfd, SIOCBONDCHANGEACTIVE, &ifr) < 0
338 && ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &ifr) < 0
339 ) {
340 bb_perror_msg_and_die(
341 "master %s, slave %s: can't "
342 "change active",
343 master_ifname, slave_ifname);
344 }
345}
346
347static int enslave(char *master_ifname, char *slave_ifname)
348{
349 struct ifreq ifr;
350 int res;
351
352 if (slave.flags.ifr_flags & IFF_SLAVE) {
353 bb_error_msg(
354 "%s is already a slave",
355 slave_ifname);
356 return 1;
357 }
358
359 res = set_if_down(slave_ifname, slave.flags.ifr_flags);
360 if (res)
361 return res;
362
363 if (abi_ver < 2) {
364 /* Older bonding versions would panic if the slave has no IP
365 * address, so get the IP setting from the master.
366 */
367 res = set_if_addr(master_ifname, slave_ifname);
368 if (res) {
369 bb_perror_msg("%s: can't set address", slave_ifname);
370 return res;
371 }
372 } else {
373 res = clear_if_addr(slave_ifname);
374 if (res) {
375 bb_perror_msg("%s: can't clear address", slave_ifname);
376 return res;
377 }
378 }
379
380 if (master.mtu.ifr_mtu != slave.mtu.ifr_mtu) {
381 res = set_slave_mtu(slave_ifname, master.mtu.ifr_mtu);
382 if (res) {
383 bb_perror_msg("%s: can't set MTU", slave_ifname);
384 return res;
385 }
386 }
387
388 if (hwaddr_set) {
389 /* Master already has an hwaddr
390 * so set it's hwaddr to the slave
391 */
392 if (abi_ver < 1) {
393 /* The driver is using an old ABI, so
394 * the application sets the slave's
395 * hwaddr
396 */
397 res = set_slave_hwaddr(slave_ifname,
398 &(master.hwaddr.ifr_hwaddr));
399 if (res) {
400 bb_perror_msg("%s: can't set hw address",
401 slave_ifname);
402 goto undo_mtu;
403 }
404
405 /* For old ABI the application needs to bring the
406 * slave back up
407 */
408 res = set_if_up(slave_ifname, slave.flags.ifr_flags);
409 if (res)
410 goto undo_slave_mac;
411 }
412 /* The driver is using a new ABI,
413 * so the driver takes care of setting
414 * the slave's hwaddr and bringing
415 * it up again
416 */
417 } else {
418 /* No hwaddr for master yet, so
419 * set the slave's hwaddr to it
420 */
421 if (abi_ver < 1) {
422 /* For old ABI, the master needs to be
423 * down before setting it's hwaddr
424 */
425 res = set_if_down(master_ifname, master.flags.ifr_flags);
426 if (res)
427 goto undo_mtu;
428 }
429
430 res = set_master_hwaddr(master_ifname,
431 &(slave.hwaddr.ifr_hwaddr));
432 if (res) {
433 bb_error_msg("%s: can't set hw address",
434 master_ifname);
435 goto undo_mtu;
436 }
437
438 if (abi_ver < 1) {
439 /* For old ABI, bring the master
440 * back up
441 */
442 res = set_if_up(master_ifname, master.flags.ifr_flags);
443 if (res)
444 goto undo_master_mac;
445 }
446
447 hwaddr_set = 1;
448 }
449
450 /* Do the real thing */
451 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
452 strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
453 if (ioctl(skfd, SIOCBONDENSLAVE, &ifr) < 0
454 && ioctl(skfd, BOND_ENSLAVE_OLD, &ifr) < 0
455 ) {
456 res = 1;
457 }
458
459 if (res)
460 goto undo_master_mac;
461
462 return 0;
463
464/* rollback (best effort) */
465 undo_master_mac:
466 set_master_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr));
467 hwaddr_set = 0;
468 goto undo_mtu;
469 undo_slave_mac:
470 set_slave_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr));
471 undo_mtu:
472 set_slave_mtu(slave_ifname, slave.mtu.ifr_mtu);
473 return res;
474}
475
476static int release(char *master_ifname, char *slave_ifname)
477{
478 struct ifreq ifr;
479 int res = 0;
480
481 if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
482 bb_error_msg("%s is not a slave",
483 slave_ifname);
484 return 1;
485 }
486
487 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
488 strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
489 if (ioctl(skfd, SIOCBONDRELEASE, &ifr) < 0
490 && ioctl(skfd, BOND_RELEASE_OLD, &ifr) < 0
491 ) {
492 return 1;
493 }
494 if (abi_ver < 1) {
495 /* The driver is using an old ABI, so we'll set the interface
496 * down to avoid any conflicts due to same MAC/IP
497 */
498 res = set_if_down(slave_ifname, slave.flags.ifr_flags);
499 }
500
501 /* set to default mtu */
502 set_slave_mtu(slave_ifname, 1500);
503
504 return res;
505}
506
507static int get_if_settings(char *ifname, struct dev_data *dd)
508{
509 int res;
510
511 strncpy(dd->mtu.ifr_name, ifname, IFNAMSIZ);
512 res = ioctl(skfd, SIOCGIFMTU, &dd->mtu);
513 strncpy(dd->flags.ifr_name, ifname, IFNAMSIZ);
514 res |= ioctl(skfd, SIOCGIFFLAGS, &dd->flags);
515 strncpy(dd->hwaddr.ifr_name, ifname, IFNAMSIZ);
516 res |= ioctl(skfd, SIOCGIFHWADDR, &dd->hwaddr);
517
518 return res;
519}
520
521static int get_slave_flags(char *slave_ifname)
522{
523 strncpy(slave.flags.ifr_name, slave_ifname, IFNAMSIZ);
524 return ioctl(skfd, SIOCGIFFLAGS, &slave.flags);
525}
526
527static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr)
528{
529 struct ifreq ifr;
530
531 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
532 memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
533 return ioctl(skfd, SIOCSIFHWADDR, &ifr);
534}
535
536static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr)
537{
538 struct ifreq ifr;
539
540 strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
541 memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
542 return ioctl(skfd, SIOCSIFHWADDR, &ifr);
543}
544
545static int set_slave_mtu(char *slave_ifname, int mtu)
546{
547 struct ifreq ifr;
548
549 ifr.ifr_mtu = mtu;
550 strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
551 return ioctl(skfd, SIOCSIFMTU, &ifr);
552}
553
554static int set_if_flags(char *ifname, short flags)
555{
556 struct ifreq ifr;
557
558 ifr.ifr_flags = flags;
559 strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
560 return ioctl(skfd, SIOCSIFFLAGS, &ifr);
561}
562
563static int set_if_up(char *ifname, short flags)
564{
565 int res = set_if_flags(ifname, flags | IFF_UP);
566 if (res)
567 bb_perror_msg("%s: can't up", ifname);
568 return res;
569}
570
571static int set_if_down(char *ifname, short flags)
572{
573 int res = set_if_flags(ifname, flags & ~IFF_UP);
574 if (res)
575 bb_perror_msg("%s: can't down", ifname);
576 return res;
577}
578
579static int clear_if_addr(char *ifname)
580{
581 struct ifreq ifr;
582
583 strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
584 ifr.ifr_addr.sa_family = AF_INET;
585 memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
586 return ioctl(skfd, SIOCSIFADDR, &ifr);
587}
588
589static int set_if_addr(char *master_ifname, char *slave_ifname)
590{
591 static const struct {
592 int g_ioctl;
593 int s_ioctl;
594 } ifra[] = {
595 { SIOCGIFADDR, SIOCSIFADDR },
596 { SIOCGIFDSTADDR, SIOCSIFDSTADDR },
597 { SIOCGIFBRDADDR, SIOCSIFBRDADDR },
598 { SIOCGIFNETMASK, SIOCSIFNETMASK },
599 };
600
601 struct ifreq ifr;
602 int res;
603 int i;
604
605 for (i = 0; i < ARRAY_SIZE(ifra); i++) {
606 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
607 res = ioctl(skfd, ifra[i].g_ioctl, &ifr);
608 if (res < 0) {
609 ifr.ifr_addr.sa_family = AF_INET;
610 memset(ifr.ifr_addr.sa_data, 0,
611 sizeof(ifr.ifr_addr.sa_data));
612 }
613
614 strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
615 res = ioctl(skfd, ifra[i].s_ioctl, &ifr);
616 if (res < 0)
617 return res;
618 }
619
620 return 0;
621}
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