Contents of /trunk/mkinitrd-magellan/busybox/networking/ifenslave.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 16848 byte(s)
-updated to busybox-1.17.1
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.h> - no. linux/if_bonding.h pulls in linux/if.h */ |
104 | #include <linux/if.h> |
105 | //#include <net/if_arp.h> - not needed? |
106 | #include <linux/if_bonding.h> |
107 | #include <linux/sockios.h> |
108 | #include "fix_u32.h" /* hack, so we may include kernel's ethtool.h */ |
109 | #include <linux/ethtool.h> |
110 | #ifndef BOND_ABI_VERSION |
111 | # define BOND_ABI_VERSION 2 |
112 | #endif |
113 | #ifndef IFNAMSIZ |
114 | # define IFNAMSIZ 16 |
115 | #endif |
116 | |
117 | |
118 | struct dev_data { |
119 | struct ifreq mtu, flags, hwaddr; |
120 | }; |
121 | |
122 | |
123 | enum { skfd = 3 }; /* AF_INET socket for ioctl() calls. */ |
124 | struct globals { |
125 | unsigned abi_ver; /* userland - kernel ABI version */ |
126 | smallint hwaddr_set; /* Master's hwaddr is set */ |
127 | struct dev_data master; |
128 | struct dev_data slave; |
129 | }; |
130 | #define G (*ptr_to_globals) |
131 | #define abi_ver (G.abi_ver ) |
132 | #define hwaddr_set (G.hwaddr_set) |
133 | #define master (G.master ) |
134 | #define slave (G.slave ) |
135 | #define INIT_G() do { \ |
136 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
137 | } while (0) |
138 | |
139 | |
140 | /* NOINLINEs are placed where it results in smaller code (gcc 4.3.1) */ |
141 | |
142 | static int ioctl_on_skfd(unsigned request, struct ifreq *ifr) |
143 | { |
144 | return ioctl(skfd, request, ifr); |
145 | } |
146 | |
147 | static int set_ifrname_and_do_ioctl(unsigned request, struct ifreq *ifr, const char *ifname) |
148 | { |
149 | strncpy_IFNAMSIZ(ifr->ifr_name, ifname); |
150 | return ioctl_on_skfd(request, ifr); |
151 | } |
152 | |
153 | static int get_if_settings(char *ifname, struct dev_data *dd) |
154 | { |
155 | int res; |
156 | |
157 | res = set_ifrname_and_do_ioctl(SIOCGIFMTU, &dd->mtu, ifname); |
158 | res |= set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &dd->flags, ifname); |
159 | res |= set_ifrname_and_do_ioctl(SIOCGIFHWADDR, &dd->hwaddr, ifname); |
160 | |
161 | return res; |
162 | } |
163 | |
164 | static int get_slave_flags(char *slave_ifname) |
165 | { |
166 | return set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &slave.flags, slave_ifname); |
167 | } |
168 | |
169 | static int set_hwaddr(char *ifname, struct sockaddr *hwaddr) |
170 | { |
171 | struct ifreq ifr; |
172 | |
173 | memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(*hwaddr)); |
174 | return set_ifrname_and_do_ioctl(SIOCSIFHWADDR, &ifr, ifname); |
175 | } |
176 | |
177 | static int set_mtu(char *ifname, int mtu) |
178 | { |
179 | struct ifreq ifr; |
180 | |
181 | ifr.ifr_mtu = mtu; |
182 | return set_ifrname_and_do_ioctl(SIOCSIFMTU, &ifr, ifname); |
183 | } |
184 | |
185 | static int set_if_flags(char *ifname, int flags) |
186 | { |
187 | struct ifreq ifr; |
188 | |
189 | ifr.ifr_flags = flags; |
190 | return set_ifrname_and_do_ioctl(SIOCSIFFLAGS, &ifr, ifname); |
191 | } |
192 | |
193 | static int set_if_up(char *ifname, int flags) |
194 | { |
195 | int res = set_if_flags(ifname, flags | IFF_UP); |
196 | if (res) |
197 | bb_perror_msg("%s: can't up", ifname); |
198 | return res; |
199 | } |
200 | |
201 | static int set_if_down(char *ifname, int flags) |
202 | { |
203 | int res = set_if_flags(ifname, flags & ~IFF_UP); |
204 | if (res) |
205 | bb_perror_msg("%s: can't down", ifname); |
206 | return res; |
207 | } |
208 | |
209 | static int clear_if_addr(char *ifname) |
210 | { |
211 | struct ifreq ifr; |
212 | |
213 | ifr.ifr_addr.sa_family = AF_INET; |
214 | memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data)); |
215 | return set_ifrname_and_do_ioctl(SIOCSIFADDR, &ifr, ifname); |
216 | } |
217 | |
218 | static int set_if_addr(char *master_ifname, char *slave_ifname) |
219 | { |
220 | #if (SIOCGIFADDR | SIOCSIFADDR \ |
221 | | SIOCGIFDSTADDR | SIOCSIFDSTADDR \ |
222 | | SIOCGIFBRDADDR | SIOCSIFBRDADDR \ |
223 | | SIOCGIFNETMASK | SIOCSIFNETMASK) <= 0xffff |
224 | #define INT uint16_t |
225 | #else |
226 | #define INT int |
227 | #endif |
228 | static const struct { |
229 | INT g_ioctl; |
230 | INT s_ioctl; |
231 | } ifra[] = { |
232 | { SIOCGIFADDR, SIOCSIFADDR }, |
233 | { SIOCGIFDSTADDR, SIOCSIFDSTADDR }, |
234 | { SIOCGIFBRDADDR, SIOCSIFBRDADDR }, |
235 | { SIOCGIFNETMASK, SIOCSIFNETMASK }, |
236 | }; |
237 | |
238 | struct ifreq ifr; |
239 | int res; |
240 | unsigned i; |
241 | |
242 | for (i = 0; i < ARRAY_SIZE(ifra); i++) { |
243 | res = set_ifrname_and_do_ioctl(ifra[i].g_ioctl, &ifr, master_ifname); |
244 | if (res < 0) { |
245 | ifr.ifr_addr.sa_family = AF_INET; |
246 | memset(ifr.ifr_addr.sa_data, 0, |
247 | sizeof(ifr.ifr_addr.sa_data)); |
248 | } |
249 | |
250 | res = set_ifrname_and_do_ioctl(ifra[i].s_ioctl, &ifr, slave_ifname); |
251 | if (res < 0) |
252 | return res; |
253 | } |
254 | |
255 | return 0; |
256 | } |
257 | |
258 | static void change_active(char *master_ifname, char *slave_ifname) |
259 | { |
260 | struct ifreq ifr; |
261 | |
262 | if (!(slave.flags.ifr_flags & IFF_SLAVE)) { |
263 | bb_error_msg_and_die("%s is not a slave", slave_ifname); |
264 | } |
265 | |
266 | strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); |
267 | if (set_ifrname_and_do_ioctl(SIOCBONDCHANGEACTIVE, &ifr, master_ifname) |
268 | && ioctl_on_skfd(BOND_CHANGE_ACTIVE_OLD, &ifr) |
269 | ) { |
270 | bb_perror_msg_and_die( |
271 | "master %s, slave %s: can't " |
272 | "change active", |
273 | master_ifname, slave_ifname); |
274 | } |
275 | } |
276 | |
277 | static NOINLINE int enslave(char *master_ifname, char *slave_ifname) |
278 | { |
279 | struct ifreq ifr; |
280 | int res; |
281 | |
282 | if (slave.flags.ifr_flags & IFF_SLAVE) { |
283 | bb_error_msg( |
284 | "%s is already a slave", |
285 | slave_ifname); |
286 | return 1; |
287 | } |
288 | |
289 | res = set_if_down(slave_ifname, slave.flags.ifr_flags); |
290 | if (res) |
291 | return res; |
292 | |
293 | if (abi_ver < 2) { |
294 | /* Older bonding versions would panic if the slave has no IP |
295 | * address, so get the IP setting from the master. |
296 | */ |
297 | res = set_if_addr(master_ifname, slave_ifname); |
298 | if (res) { |
299 | bb_perror_msg("%s: can't set address", slave_ifname); |
300 | return res; |
301 | } |
302 | } else { |
303 | res = clear_if_addr(slave_ifname); |
304 | if (res) { |
305 | bb_perror_msg("%s: can't clear address", slave_ifname); |
306 | return res; |
307 | } |
308 | } |
309 | |
310 | if (master.mtu.ifr_mtu != slave.mtu.ifr_mtu) { |
311 | res = set_mtu(slave_ifname, master.mtu.ifr_mtu); |
312 | if (res) { |
313 | bb_perror_msg("%s: can't set MTU", slave_ifname); |
314 | return res; |
315 | } |
316 | } |
317 | |
318 | if (hwaddr_set) { |
319 | /* Master already has an hwaddr |
320 | * so set it's hwaddr to the slave |
321 | */ |
322 | if (abi_ver < 1) { |
323 | /* The driver is using an old ABI, so |
324 | * the application sets the slave's |
325 | * hwaddr |
326 | */ |
327 | if (set_hwaddr(slave_ifname, &(master.hwaddr.ifr_hwaddr))) { |
328 | bb_perror_msg("%s: can't set hw address", |
329 | slave_ifname); |
330 | goto undo_mtu; |
331 | } |
332 | |
333 | /* For old ABI the application needs to bring the |
334 | * slave back up |
335 | */ |
336 | if (set_if_up(slave_ifname, slave.flags.ifr_flags)) |
337 | goto undo_slave_mac; |
338 | } |
339 | /* The driver is using a new ABI, |
340 | * so the driver takes care of setting |
341 | * the slave's hwaddr and bringing |
342 | * it up again |
343 | */ |
344 | } else { |
345 | /* No hwaddr for master yet, so |
346 | * set the slave's hwaddr to it |
347 | */ |
348 | if (abi_ver < 1) { |
349 | /* For old ABI, the master needs to be |
350 | * down before setting it's hwaddr |
351 | */ |
352 | if (set_if_down(master_ifname, master.flags.ifr_flags)) |
353 | goto undo_mtu; |
354 | } |
355 | |
356 | if (set_hwaddr(master_ifname, &(slave.hwaddr.ifr_hwaddr))) { |
357 | bb_error_msg("%s: can't set hw address", |
358 | master_ifname); |
359 | goto undo_mtu; |
360 | } |
361 | |
362 | if (abi_ver < 1) { |
363 | /* For old ABI, bring the master |
364 | * back up |
365 | */ |
366 | if (set_if_up(master_ifname, master.flags.ifr_flags)) |
367 | goto undo_master_mac; |
368 | } |
369 | |
370 | hwaddr_set = 1; |
371 | } |
372 | |
373 | /* Do the real thing */ |
374 | strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); |
375 | if (set_ifrname_and_do_ioctl(SIOCBONDENSLAVE, &ifr, master_ifname) |
376 | && ioctl_on_skfd(BOND_ENSLAVE_OLD, &ifr) |
377 | ) { |
378 | goto undo_master_mac; |
379 | } |
380 | |
381 | return 0; |
382 | |
383 | /* rollback (best effort) */ |
384 | undo_master_mac: |
385 | set_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr)); |
386 | hwaddr_set = 0; |
387 | goto undo_mtu; |
388 | |
389 | undo_slave_mac: |
390 | set_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr)); |
391 | undo_mtu: |
392 | set_mtu(slave_ifname, slave.mtu.ifr_mtu); |
393 | return 1; |
394 | } |
395 | |
396 | static int release(char *master_ifname, char *slave_ifname) |
397 | { |
398 | struct ifreq ifr; |
399 | int res = 0; |
400 | |
401 | if (!(slave.flags.ifr_flags & IFF_SLAVE)) { |
402 | bb_error_msg("%s is not a slave", slave_ifname); |
403 | return 1; |
404 | } |
405 | |
406 | strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname); |
407 | if (set_ifrname_and_do_ioctl(SIOCBONDRELEASE, &ifr, master_ifname) < 0 |
408 | && ioctl_on_skfd(BOND_RELEASE_OLD, &ifr) < 0 |
409 | ) { |
410 | return 1; |
411 | } |
412 | if (abi_ver < 1) { |
413 | /* The driver is using an old ABI, so we'll set the interface |
414 | * down to avoid any conflicts due to same MAC/IP |
415 | */ |
416 | res = set_if_down(slave_ifname, slave.flags.ifr_flags); |
417 | } |
418 | |
419 | /* set to default mtu */ |
420 | set_mtu(slave_ifname, 1500); |
421 | |
422 | return res; |
423 | } |
424 | |
425 | static NOINLINE void get_drv_info(char *master_ifname) |
426 | { |
427 | struct ifreq ifr; |
428 | struct ethtool_drvinfo info; |
429 | |
430 | memset(&ifr, 0, sizeof(ifr)); |
431 | ifr.ifr_data = (caddr_t)&info; |
432 | info.cmd = ETHTOOL_GDRVINFO; |
433 | /* both fields are 32 bytes long (long enough) */ |
434 | strcpy(info.driver, "ifenslave"); |
435 | strcpy(info.fw_version, utoa(BOND_ABI_VERSION)); |
436 | if (set_ifrname_and_do_ioctl(SIOCETHTOOL, &ifr, master_ifname) < 0) { |
437 | if (errno == EOPNOTSUPP) |
438 | return; |
439 | bb_perror_msg_and_die("%s: SIOCETHTOOL error", master_ifname); |
440 | } |
441 | |
442 | abi_ver = bb_strtou(info.fw_version, NULL, 0); |
443 | if (errno) |
444 | bb_error_msg_and_die("%s: SIOCETHTOOL error", master_ifname); |
445 | } |
446 | |
447 | int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
448 | int ifenslave_main(int argc UNUSED_PARAM, char **argv) |
449 | { |
450 | char *master_ifname, *slave_ifname; |
451 | int rv; |
452 | int res; |
453 | unsigned opt; |
454 | enum { |
455 | OPT_c = (1 << 0), |
456 | OPT_d = (1 << 1), |
457 | OPT_f = (1 << 2), |
458 | }; |
459 | #if ENABLE_LONG_OPTS |
460 | static const char ifenslave_longopts[] ALIGN1 = |
461 | "change-active\0" No_argument "c" |
462 | "detach\0" No_argument "d" |
463 | "force\0" No_argument "f" |
464 | /* "all-interfaces\0" No_argument "a" */ |
465 | ; |
466 | |
467 | applet_long_options = ifenslave_longopts; |
468 | #endif |
469 | INIT_G(); |
470 | |
471 | opt = getopt32(argv, "cdfa"); |
472 | argv += optind; |
473 | if (opt & (opt-1)) /* Only one option can be given */ |
474 | bb_show_usage(); |
475 | |
476 | master_ifname = *argv++; |
477 | |
478 | /* No interface names - show all interfaces. */ |
479 | if (!master_ifname) { |
480 | display_interfaces(NULL); |
481 | return EXIT_SUCCESS; |
482 | } |
483 | |
484 | /* Open a basic socket */ |
485 | xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), skfd); |
486 | |
487 | /* Exchange abi version with bonding module */ |
488 | get_drv_info(master_ifname); |
489 | |
490 | slave_ifname = *argv++; |
491 | if (!slave_ifname) { |
492 | if (opt & (OPT_d|OPT_c)) { |
493 | /* --change or --detach, and no slaves given - |
494 | * show all interfaces. */ |
495 | display_interfaces(slave_ifname /* == NULL */); |
496 | return 2; /* why 2? */ |
497 | } |
498 | /* A single arg means show the |
499 | * configuration for this interface |
500 | */ |
501 | display_interfaces(master_ifname); |
502 | return EXIT_SUCCESS; |
503 | } |
504 | |
505 | if (get_if_settings(master_ifname, &master)) { |
506 | /* Probably a good reason not to go on */ |
507 | bb_perror_msg_and_die("%s: can't get settings", master_ifname); |
508 | } |
509 | |
510 | /* Check if master is indeed a master; |
511 | * if not then fail any operation |
512 | */ |
513 | if (!(master.flags.ifr_flags & IFF_MASTER)) |
514 | bb_error_msg_and_die("%s is not a master", master_ifname); |
515 | |
516 | /* Check if master is up; if not then fail any operation */ |
517 | if (!(master.flags.ifr_flags & IFF_UP)) |
518 | bb_error_msg_and_die("%s is not up", master_ifname); |
519 | |
520 | #ifdef WHY_BOTHER |
521 | /* Neither -c[hange] nor -d[etach] -> it's "enslave" then; |
522 | * and -f[orce] is not there too. Check that it's ethernet. */ |
523 | if (!(opt & (OPT_d|OPT_c|OPT_f)) { |
524 | /* The family '1' is ARPHRD_ETHER for ethernet. */ |
525 | if (master.hwaddr.ifr_hwaddr.sa_family != 1) { |
526 | bb_error_msg_and_die( |
527 | "%s is not ethernet-like (-f overrides)", |
528 | master_ifname); |
529 | } |
530 | } |
531 | #endif |
532 | |
533 | /* Accepts only one slave */ |
534 | if (opt & OPT_c) { |
535 | /* Change active slave */ |
536 | if (get_slave_flags(slave_ifname)) { |
537 | bb_perror_msg_and_die( |
538 | "%s: can't get flags", slave_ifname); |
539 | } |
540 | change_active(master_ifname, slave_ifname); |
541 | return EXIT_SUCCESS; |
542 | } |
543 | |
544 | /* Accepts multiple slaves */ |
545 | res = 0; |
546 | do { |
547 | if (opt & OPT_d) { |
548 | /* Detach a slave interface from the master */ |
549 | rv = get_slave_flags(slave_ifname); |
550 | if (rv) { |
551 | /* Can't work with this slave, */ |
552 | /* remember the error and skip it */ |
553 | bb_perror_msg( |
554 | "skipping %s: can't get flags", |
555 | slave_ifname); |
556 | res = rv; |
557 | continue; |
558 | } |
559 | rv = release(master_ifname, slave_ifname); |
560 | if (rv) { |
561 | bb_perror_msg("can't release %s from %s", |
562 | slave_ifname, master_ifname); |
563 | res = rv; |
564 | } |
565 | } else { |
566 | /* Attach a slave interface to the master */ |
567 | rv = get_if_settings(slave_ifname, &slave); |
568 | if (rv) { |
569 | /* Can't work with this slave, */ |
570 | /* remember the error and skip it */ |
571 | bb_perror_msg( |
572 | "skipping %s: can't get settings", |
573 | slave_ifname); |
574 | res = rv; |
575 | continue; |
576 | } |
577 | rv = enslave(master_ifname, slave_ifname); |
578 | if (rv) { |
579 | bb_perror_msg("can't enslave %s to %s", |
580 | slave_ifname, master_ifname); |
581 | res = rv; |
582 | } |
583 | } |
584 | } while ((slave_ifname = *argv++) != NULL); |
585 | |
586 | if (ENABLE_FEATURE_CLEAN_UP) { |
587 | close(skfd); |
588 | } |
589 | |
590 | return res; |
591 | } |