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1/* Mode: C;
2 * ifenslave.c: Configure network interfaces for parallel routing.
3 *
4 * This program controls the Linux implementation of running multiple
5 * network interfaces in parallel.
6 *
7 * Author: Donald Becker <becker@cesdis.gsfc.nasa.gov>
8 * Copyright 1994-1996 Donald Becker
9 *
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.
13 *
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
17 *
18 * Changes :
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
24 *
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.
29 *
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
32 * at runtime.
33 *
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
38 * old versions
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
42 *
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).
51 *
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.
61 *
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.
68 *
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.
76 *
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
80 * processing.
81 *
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 handeled separately.
91 *
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
95 */
96
97#define APP_VERSION "1.1.0"
98#define APP_RELDATE "December 1, 2003"
99#define APP_NAME "ifenslave"
100
101static char *version =
102APP_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";
107
108static 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";
113
114static const char *help_msg =
115"\n"
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"
126"\n"
127" To set the bond device down and automatically release all the slaves :\n"
128" # ifconfig bond0 down\n"
129"\n"
130" To detach a dead interface without setting the bond device down :\n"
131" # ifenslave {-d|--detach} bond0 eth0 [eth1 [eth2]...]\n"
132"\n"
133" To change active slave :\n"
134" # ifenslave {-c|--change-active} bond0 eth0\n"
135"\n"
136" To show master interface info\n"
137" # ifenslave bond0\n"
138"\n"
139" To show all interfaces info\n"
140" # ifenslave {-a|--all-interfaces}\n"
141"\n"
142" To be more verbose\n"
143" # ifenslave {-v|--verbose} ...\n"
144"\n"
145" # ifenslave {-u|--usage} Show usage\n"
146" # ifenslave {-V|--version} Show version\n"
147" # ifenslave {-h|--help} This message\n"
148"\n";
149
150#include <unistd.h>
151#include <stdlib.h>
152#include <stdio.h>
153#include <ctype.h>
154#include <string.h>
155#include <errno.h>
156#include <fcntl.h>
157#include <getopt.h>
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>
166
167typedef unsigned long long u64; /* hack, so we may include kernel's ethtool.h */
168typedef __uint32_t u32; /* ditto */
169typedef __uint16_t u16; /* ditto */
170typedef __uint8_t u8; /* ditto */
171#include <linux/ethtool.h>
172
173struct 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. */
183 { 0, 0, 0, 0}
184};
185
186/* Command-line flags. */
187unsigned int
188opt_a = 0, /* Show-all-interfaces flag. */
189opt_c = 0, /* Change-active-slave flag. */
190opt_d = 0, /* Detach a slave interface. */
191opt_f = 0, /* Force the operation. */
192opt_h = 0, /* Help */
193opt_u = 0, /* Usage */
194opt_v = 0, /* Verbose flag. */
195opt_V = 0; /* Version */
196
197int skfd = -1; /* AF_INET socket for ioctl() calls.*/
198int abi_ver = 0; /* userland - kernel ABI version */
199int hwaddr_set = 0; /* Master's hwaddr is set */
200int saved_errno;
201
202struct ifreq master_mtu, master_flags, master_hwaddr;
203struct ifreq slave_mtu, slave_flags, slave_hwaddr;
204
205struct dev_ifr {
206 struct ifreq *req_ifr;
207 char *req_name;
208 int req_type;
209};
210
211struct dev_ifr master_ifra[] = {
212 {&master_mtu, "SIOCGIFMTU", SIOCGIFMTU},
213 {&master_flags, "SIOCGIFFLAGS", SIOCGIFFLAGS},
214 {&master_hwaddr, "SIOCGIFHWADDR", SIOCGIFHWADDR},
215 {NULL, "", 0}
216};
217
218struct dev_ifr slave_ifra[] = {
219 {&slave_mtu, "SIOCGIFMTU", SIOCGIFMTU},
220 {&slave_flags, "SIOCGIFFLAGS", SIOCGIFFLAGS},
221 {&slave_hwaddr, "SIOCGIFHWADDR", SIOCGIFHWADDR},
222 {NULL, "", 0}
223};
224
225static void if_print(char *ifname);
226static int get_drv_info(char *master_ifname);
227static int get_if_settings(char *ifname, struct dev_ifr ifra[]);
228static int get_slave_flags(char *slave_ifname);
229static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr);
230static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr);
231static int set_slave_mtu(char *slave_ifname, int mtu);
232static int set_if_flags(char *ifname, short flags);
233static int set_if_up(char *ifname, short flags);
234static int set_if_down(char *ifname, short flags);
235static int clear_if_addr(char *ifname);
236static int set_if_addr(char *master_ifname, char *slave_ifname);
237static int change_active(char *master_ifname, char *slave_ifname);
238static int enslave(char *master_ifname, char *slave_ifname);
239static int release(char *master_ifname, char *slave_ifname);
240#define v_print(fmt, args...) \
241 if (opt_v) \
242 fprintf(stderr, fmt, ## args )
243
244int main(int argc, char *argv[])
245{
246 char **spp, *master_ifname, *slave_ifname;
247 int c, i, rv;
248 int res = 0;
249 int exclusive = 0;
250
251 while ((c = getopt_long(argc, argv, "acdfhuvV", longopts, 0)) != EOF) {
252 switch (c) {
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;
261
262 case '?':
263 fprintf(stderr, usage_msg);
264 res = 2;
265 goto out;
266 }
267 }
268
269 /* options check */
270 if (exclusive > 1) {
271 fprintf(stderr, usage_msg);
272 res = 2;
273 goto out;
274 }
275
276 if (opt_v || opt_V) {
277 printf(version);
278 if (opt_V) {
279 res = 0;
280 goto out;
281 }
282 }
283
284 if (opt_u) {
285 printf(usage_msg);
286 res = 0;
287 goto out;
288 }
289
290 if (opt_h) {
291 printf(usage_msg);
292 printf(help_msg);
293 res = 0;
294 goto out;
295 }
296
297 /* Open a basic socket */
298 if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
299 perror("socket");
300 res = 1;
301 goto out;
302 }
303
304 if (opt_a) {
305 if (optind == argc) {
306 /* No remaining args */
307 /* show all interfaces */
308 if_print((char *)NULL);
309 goto out;
310 } else {
311 /* Just show usage */
312 fprintf(stderr, usage_msg);
313 res = 2;
314 goto out;
315 }
316 }
317
318 /* Copy the interface name */
319 spp = argv + optind;
320 master_ifname = *spp++;
321
322 if (master_ifname == NULL) {
323 fprintf(stderr, usage_msg);
324 res = 2;
325 goto out;
326 }
327
328 /* exchange abi version with bonding module */
329 res = get_drv_info(master_ifname);
330 if (res) {
331 fprintf(stderr,
332 "Master '%s': Error: handshake with driver failed. "
333 "Aborting\n",
334 master_ifname);
335 goto out;
336 }
337
338 slave_ifname = *spp++;
339
340 if (slave_ifname == NULL) {
341 if (opt_d || opt_c) {
342 fprintf(stderr, usage_msg);
343 res = 2;
344 goto out;
345 }
346
347 /* A single arg means show the
348 * configuration for this interface
349 */
350 if_print(master_ifname);
351 goto out;
352 }
353
354 res = get_if_settings(master_ifname, master_ifra);
355 if (res) {
356 /* Probably a good reason not to go on */
357 fprintf(stderr,
358 "Master '%s': Error: get settings failed: %s. "
359 "Aborting\n",
360 master_ifname, strerror(res));
361 goto out;
362 }
363
364 /* check if master is indeed a master;
365 * if not then fail any operation
366 */
367 if (!(master_flags.ifr_flags & IFF_MASTER)) {
368 fprintf(stderr,
369 "Illegal operation; the specified interface '%s' "
370 "is not a master. Aborting\n",
371 master_ifname);
372 res = 1;
373 goto out;
374 }
375
376 /* check if master is up; if not then fail any operation */
377 if (!(master_flags.ifr_flags & IFF_UP)) {
378 fprintf(stderr,
379 "Illegal operation; the specified master interface "
380 "'%s' is not up.\n",
381 master_ifname);
382 res = 1;
383 goto out;
384 }
385
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;
391
392 /* The family '1' is ARPHRD_ETHER for ethernet. */
393 if (master_family != 1 && !opt_f) {
394 fprintf(stderr,
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 "
400 "operation.\n",
401 master_ifname);
402 res = 1;
403 goto out;
404 }
405
406 /* Check master's hw addr */
407 for (i = 0; i < 6; i++) {
408 if (hwaddr[i] != 0) {
409 hwaddr_set = 1;
410 break;
411 }
412 }
413
414 if (hwaddr_set) {
415 v_print("current hardware address of master '%s' "
416 "is %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x, "
417 "type %d\n",
418 master_ifname,
419 hwaddr[0], hwaddr[1],
420 hwaddr[2], hwaddr[3],
421 hwaddr[4], hwaddr[5],
422 master_family);
423 }
424 }
425
426 /* Accepts only one slave */
427 if (opt_c) {
428 /* change active slave */
429 res = get_slave_flags(slave_ifname);
430 if (res) {
431 fprintf(stderr,
432 "Slave '%s': Error: get flags failed. "
433 "Aborting\n",
434 slave_ifname);
435 goto out;
436 }
437 res = change_active(master_ifname, slave_ifname);
438 if (res) {
439 fprintf(stderr,
440 "Master '%s', Slave '%s': Error: "
441 "Change active failed\n",
442 master_ifname, slave_ifname);
443 }
444 } else {
445 /* Accept multiple slaves */
446 do {
447 if (opt_d) {
448 /* detach a slave interface from the master */
449 rv = get_slave_flags(slave_ifname);
450 if (rv) {
451 /* Can't work with this slave. */
452 /* remember the error and skip it*/
453 fprintf(stderr,
454 "Slave '%s': Error: get flags "
455 "failed. Skipping\n",
456 slave_ifname);
457 res = rv;
458 continue;
459 }
460 rv = release(master_ifname, slave_ifname);
461 if (rv) {
462 fprintf(stderr,
463 "Master '%s', Slave '%s': Error: "
464 "Release failed\n",
465 master_ifname, slave_ifname);
466 res = rv;
467 }
468 } else {
469 /* attach a slave interface to the master */
470 rv = get_if_settings(slave_ifname, slave_ifra);
471 if (rv) {
472 /* Can't work with this slave. */
473 /* remember the error and skip it*/
474 fprintf(stderr,
475 "Slave '%s': Error: get "
476 "settings failed: %s. "
477 "Skipping\n",
478 slave_ifname, strerror(rv));
479 res = rv;
480 continue;
481 }
482 rv = enslave(master_ifname, slave_ifname);
483 if (rv) {
484 fprintf(stderr,
485 "Master '%s', Slave '%s': Error: "
486 "Enslave failed\n",
487 master_ifname, slave_ifname);
488 res = rv;
489 }
490 }
491 } while ((slave_ifname = *spp++) != NULL);
492 }
493
494out:
495 if (skfd >= 0) {
496 close(skfd);
497 }
498
499 return res;
500}
501
502static short mif_flags;
503
504/* Get the inteface configuration from the kernel. */
505static int if_getconfig(char *ifname)
506{
507 struct ifreq ifr;
508 int metric, mtu; /* Parameters of the master interface. */
509 struct sockaddr dstaddr, broadaddr, netmask;
510 unsigned char *hwaddr;
511
512 strcpy(ifr.ifr_name, ifname);
513 if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
514 return -1;
515 mif_flags = ifr.ifr_flags;
516 printf("The result of SIOCGIFFLAGS on %s is %x.\n",
517 ifname, ifr.ifr_flags);
518
519 strcpy(ifr.ifr_name, ifname);
520 if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0)
521 return -1;
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]);
525
526 strcpy(ifr.ifr_name, ifname);
527 if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
528 return -1;
529
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]);
536
537 strcpy(ifr.ifr_name, ifname);
538 if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0) {
539 metric = 0;
540 } else
541 metric = ifr.ifr_metric;
542
543 strcpy(ifr.ifr_name, ifname);
544 if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
545 mtu = 0;
546 else
547 mtu = ifr.ifr_mtu;
548
549 strcpy(ifr.ifr_name, ifname);
550 if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) < 0) {
551 memset(&dstaddr, 0, sizeof(struct sockaddr));
552 } else
553 dstaddr = ifr.ifr_dstaddr;
554
555 strcpy(ifr.ifr_name, ifname);
556 if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) < 0) {
557 memset(&broadaddr, 0, sizeof(struct sockaddr));
558 } else
559 broadaddr = ifr.ifr_broadaddr;
560
561 strcpy(ifr.ifr_name, ifname);
562 if (ioctl(skfd, SIOCGIFNETMASK, &ifr) < 0) {
563 memset(&netmask, 0, sizeof(struct sockaddr));
564 } else
565 netmask = ifr.ifr_netmask;
566
567 return 0;
568}
569
570static void if_print(char *ifname)
571{
572 char buff[1024];
573 struct ifconf ifc;
574 struct ifreq *ifr;
575 int i;
576
577 if (ifname == (char *)NULL) {
578 ifc.ifc_len = sizeof(buff);
579 ifc.ifc_buf = buff;
580 if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
581 perror("SIOCGIFCONF failed");
582 return;
583 }
584
585 ifr = ifc.ifc_req;
586 for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++) {
587 if (if_getconfig(ifr->ifr_name) < 0) {
588 fprintf(stderr,
589 "%s: unknown interface.\n",
590 ifr->ifr_name);
591 continue;
592 }
593
594 if (((mif_flags & IFF_UP) == 0) && !opt_a) continue;
595 /*ife_print(&ife);*/
596 }
597 } else {
598 if (if_getconfig(ifname) < 0) {
599 fprintf(stderr,
600 "%s: unknown interface.\n", ifname);
601 }
602 }
603}
604
605static int get_drv_info(char *master_ifname)
606{
607 struct ifreq ifr;
608 struct ethtool_drvinfo info;
609 char *endptr;
610
611 memset(&ifr, 0, sizeof(ifr));
612 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
613 ifr.ifr_data = (caddr_t)&info;
614
615 info.cmd = ETHTOOL_GDRVINFO;
616 strncpy(info.driver, "ifenslave", 32);
617 snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION);
618
619 if (ioctl(skfd, SIOCETHTOOL, &ifr) < 0) {
620 if (errno == EOPNOTSUPP) {
621 goto out;
622 }
623
624 saved_errno = errno;
625 v_print("Master '%s': Error: get bonding info failed %s\n",
626 master_ifname, strerror(saved_errno));
627 return 1;
628 }
629
630 abi_ver = strtoul(info.fw_version, &endptr, 0);
631 if (*endptr) {
632 v_print("Master '%s': Error: got invalid string as an ABI "
633 "version from the bonding module\n",
634 master_ifname);
635 return 1;
636 }
637
638out:
639 v_print("ABI ver is %d\n", abi_ver);
640
641 return 0;
642}
643
644static int change_active(char *master_ifname, char *slave_ifname)
645{
646 struct ifreq ifr;
647 int res = 0;
648
649 if (!(slave_flags.ifr_flags & IFF_SLAVE)) {
650 fprintf(stderr,
651 "Illegal operation: The specified slave interface "
652 "'%s' is not a slave\n",
653 slave_ifname);
654 return 1;
655 }
656
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)) {
661 saved_errno = errno;
662 v_print("Master '%s': Error: SIOCBONDCHANGEACTIVE failed: "
663 "%s\n",
664 master_ifname, strerror(saved_errno));
665 res = 1;
666 }
667
668 return res;
669}
670
671static int enslave(char *master_ifname, char *slave_ifname)
672{
673 struct ifreq ifr;
674 int res = 0;
675
676 if (slave_flags.ifr_flags & IFF_SLAVE) {
677 fprintf(stderr,
678 "Illegal operation: The specified slave interface "
679 "'%s' is already a slave\n",
680 slave_ifname);
681 return 1;
682 }
683
684 res = set_if_down(slave_ifname, slave_flags.ifr_flags);
685 if (res) {
686 fprintf(stderr,
687 "Slave '%s': Error: bring interface down failed\n",
688 slave_ifname);
689 return res;
690 }
691
692 if (abi_ver < 2) {
693 /* Older bonding versions would panic if the slave has no IP
694 * address, so get the IP setting from the master.
695 */
696 res = set_if_addr(master_ifname, slave_ifname);
697 if (res) {
698 fprintf(stderr,
699 "Slave '%s': Error: set address failed\n",
700 slave_ifname);
701 return res;
702 }
703 } else {
704 res = clear_if_addr(slave_ifname);
705 if (res) {
706 fprintf(stderr,
707 "Slave '%s': Error: clear address failed\n",
708 slave_ifname);
709 return res;
710 }
711 }
712
713 if (master_mtu.ifr_mtu != slave_mtu.ifr_mtu) {
714 res = set_slave_mtu(slave_ifname, master_mtu.ifr_mtu);
715 if (res) {
716 fprintf(stderr,
717 "Slave '%s': Error: set MTU failed\n",
718 slave_ifname);
719 return res;
720 }
721 }
722
723 if (hwaddr_set) {
724 /* Master already has an hwaddr
725 * so set it's hwaddr to the slave
726 */
727 if (abi_ver < 1) {
728 /* The driver is using an old ABI, so
729 * the application sets the slave's
730 * hwaddr
731 */
732 res = set_slave_hwaddr(slave_ifname,
733 &(master_hwaddr.ifr_hwaddr));
734 if (res) {
735 fprintf(stderr,
736 "Slave '%s': Error: set hw address "
737 "failed\n",
738 slave_ifname);
739 goto undo_mtu;
740 }
741
742 /* For old ABI the application needs to bring the
743 * slave back up
744 */
745 res = set_if_up(slave_ifname, slave_flags.ifr_flags);
746 if (res) {
747 fprintf(stderr,
748 "Slave '%s': Error: bring interface "
749 "down failed\n",
750 slave_ifname);
751 goto undo_slave_mac;
752 }
753 }
754 /* The driver is using a new ABI,
755 * so the driver takes care of setting
756 * the slave's hwaddr and bringing
757 * it up again
758 */
759 } else {
760 /* No hwaddr for master yet, so
761 * set the slave's hwaddr to it
762 */
763 if (abi_ver < 1) {
764 /* For old ABI, the master needs to be
765 * down before setting it's hwaddr
766 */
767 res = set_if_down(master_ifname, master_flags.ifr_flags);
768 if (res) {
769 fprintf(stderr,
770 "Master '%s': Error: bring interface "
771 "down failed\n",
772 master_ifname);
773 goto undo_mtu;
774 }
775 }
776
777 res = set_master_hwaddr(master_ifname,
778 &(slave_hwaddr.ifr_hwaddr));
779 if (res) {
780 fprintf(stderr,
781 "Master '%s': Error: set hw address "
782 "failed\n",
783 master_ifname);
784 goto undo_mtu;
785 }
786
787 if (abi_ver < 1) {
788 /* For old ABI, bring the master
789 * back up
790 */
791 res = set_if_up(master_ifname, master_flags.ifr_flags);
792 if (res) {
793 fprintf(stderr,
794 "Master '%s': Error: bring interface "
795 "up failed\n",
796 master_ifname);
797 goto undo_master_mac;
798 }
799 }
800
801 hwaddr_set = 1;
802 }
803
804 /* Do the real thing */
805 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
806 strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
807 if ((ioctl(skfd, SIOCBONDENSLAVE, &ifr) < 0) &&
808 (ioctl(skfd, BOND_ENSLAVE_OLD, &ifr) < 0)) {
809 saved_errno = errno;
810 v_print("Master '%s': Error: SIOCBONDENSLAVE failed: %s\n",
811 master_ifname, strerror(saved_errno));
812 res = 1;
813 }
814
815 if (res) {
816 goto undo_master_mac;
817 }
818
819 return 0;
820
821/* rollback (best effort) */
822undo_master_mac:
823 set_master_hwaddr(master_ifname, &(master_hwaddr.ifr_hwaddr));
824 hwaddr_set = 0;
825 goto undo_mtu;
826undo_slave_mac:
827 set_slave_hwaddr(slave_ifname, &(slave_hwaddr.ifr_hwaddr));
828undo_mtu:
829 set_slave_mtu(slave_ifname, slave_mtu.ifr_mtu);
830 return res;
831}
832
833static int release(char *master_ifname, char *slave_ifname)
834{
835 struct ifreq ifr;
836 int res = 0;
837
838 if (!(slave_flags.ifr_flags & IFF_SLAVE)) {
839 fprintf(stderr,
840 "Illegal operation: The specified slave interface "
841 "'%s' is not a slave\n",
842 slave_ifname);
843 return 1;
844 }
845
846 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
847 strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
848 if ((ioctl(skfd, SIOCBONDRELEASE, &ifr) < 0) &&
849 (ioctl(skfd, BOND_RELEASE_OLD, &ifr) < 0)) {
850 saved_errno = errno;
851 v_print("Master '%s': Error: SIOCBONDRELEASE failed: %s\n",
852 master_ifname, strerror(saved_errno));
853 return 1;
854 } else if (abi_ver < 1) {
855 /* The driver is using an old ABI, so we'll set the interface
856 * down to avoid any conflicts due to same MAC/IP
857 */
858 res = set_if_down(slave_ifname, slave_flags.ifr_flags);
859 if (res) {
860 fprintf(stderr,
861 "Slave '%s': Error: bring interface "
862 "down failed\n",
863 slave_ifname);
864 }
865 }
866
867 /* set to default mtu */
868 set_slave_mtu(slave_ifname, 1500);
869
870 return res;
871}
872
873static int get_if_settings(char *ifname, struct dev_ifr ifra[])
874{
875 int i;
876 int res = 0;
877
878 for (i = 0; ifra[i].req_ifr; i++) {
879 strncpy(ifra[i].req_ifr->ifr_name, ifname, IFNAMSIZ);
880 res = ioctl(skfd, ifra[i].req_type, ifra[i].req_ifr);
881 if (res < 0) {
882 saved_errno = errno;
883 v_print("Interface '%s': Error: %s failed: %s\n",
884 ifname, ifra[i].req_name,
885 strerror(saved_errno));
886
887 return saved_errno;
888 }
889 }
890
891 return 0;
892}
893
894static int get_slave_flags(char *slave_ifname)
895{
896 int res = 0;
897
898 strncpy(slave_flags.ifr_name, slave_ifname, IFNAMSIZ);
899 res = ioctl(skfd, SIOCGIFFLAGS, &slave_flags);
900 if (res < 0) {
901 saved_errno = errno;
902 v_print("Slave '%s': Error: SIOCGIFFLAGS failed: %s\n",
903 slave_ifname, strerror(saved_errno));
904 } else {
905 v_print("Slave %s: flags %04X.\n",
906 slave_ifname, slave_flags.ifr_flags);
907 }
908
909 return res;
910}
911
912static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr)
913{
914 unsigned char *addr = (unsigned char *)hwaddr->sa_data;
915 struct ifreq ifr;
916 int res = 0;
917
918 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
919 memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
920 res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
921 if (res < 0) {
922 saved_errno = errno;
923 v_print("Master '%s': Error: SIOCSIFHWADDR failed: %s\n",
924 master_ifname, strerror(saved_errno));
925 return res;
926 } else {
927 v_print("Master '%s': hardware address set to "
928 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
929 master_ifname, addr[0], addr[1], addr[2],
930 addr[3], addr[4], addr[5]);
931 }
932
933 return res;
934}
935
936static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr)
937{
938 unsigned char *addr = (unsigned char *)hwaddr->sa_data;
939 struct ifreq ifr;
940 int res = 0;
941
942 strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
943 memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
944 res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
945 if (res < 0) {
946 saved_errno = errno;
947
948 v_print("Slave '%s': Error: SIOCSIFHWADDR failed: %s\n",
949 slave_ifname, strerror(saved_errno));
950
951 if (saved_errno == EBUSY) {
952 v_print(" The device is busy: it must be idle "
953 "before running this command.\n");
954 } else if (saved_errno == EOPNOTSUPP) {
955 v_print(" The device does not support setting "
956 "the MAC address.\n"
957 " Your kernel likely does not support slave "
958 "devices.\n");
959 } else if (saved_errno == EINVAL) {
960 v_print(" The device's address type does not match "
961 "the master's address type.\n");
962 }
963 return res;
964 } else {
965 v_print("Slave '%s': hardware address set to "
966 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
967 slave_ifname, addr[0], addr[1], addr[2],
968 addr[3], addr[4], addr[5]);
969 }
970
971 return res;
972}
973
974static int set_slave_mtu(char *slave_ifname, int mtu)
975{
976 struct ifreq ifr;
977 int res = 0;
978
979 ifr.ifr_mtu = mtu;
980 strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
981
982 res = ioctl(skfd, SIOCSIFMTU, &ifr);
983 if (res < 0) {
984 saved_errno = errno;
985 v_print("Slave '%s': Error: SIOCSIFMTU failed: %s\n",
986 slave_ifname, strerror(saved_errno));
987 } else {
988 v_print("Slave '%s': MTU set to %d.\n", slave_ifname, mtu);
989 }
990
991 return res;
992}
993
994static int set_if_flags(char *ifname, short flags)
995{
996 struct ifreq ifr;
997 int res = 0;
998
999 ifr.ifr_flags = flags;
1000 strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
1001
1002 res = ioctl(skfd, SIOCSIFFLAGS, &ifr);
1003 if (res < 0) {
1004 saved_errno = errno;
1005 v_print("Interface '%s': Error: SIOCSIFFLAGS failed: %s\n",
1006 ifname, strerror(saved_errno));
1007 } else {
1008 v_print("Interface '%s': flags set to %04X.\n", ifname, flags);
1009 }
1010
1011 return res;
1012}
1013
1014static int set_if_up(char *ifname, short flags)
1015{
1016 return set_if_flags(ifname, flags | IFF_UP);
1017}
1018
1019static int set_if_down(char *ifname, short flags)
1020{
1021 return set_if_flags(ifname, flags & ~IFF_UP);
1022}
1023
1024static int clear_if_addr(char *ifname)
1025{
1026 struct ifreq ifr;
1027 int res = 0;
1028
1029 strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
1030 ifr.ifr_addr.sa_family = AF_INET;
1031 memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
1032
1033 res = ioctl(skfd, SIOCSIFADDR, &ifr);
1034 if (res < 0) {
1035 saved_errno = errno;
1036 v_print("Interface '%s': Error: SIOCSIFADDR failed: %s\n",
1037 ifname, strerror(saved_errno));
1038 } else {
1039 v_print("Interface '%s': address cleared\n", ifname);
1040 }
1041
1042 return res;
1043}
1044
1045static int set_if_addr(char *master_ifname, char *slave_ifname)
1046{
1047 struct ifreq ifr;
1048 int res;
1049 unsigned char *ipaddr;
1050 int i;
1051 struct {
1052 char *req_name;
1053 char *desc;
1054 int g_ioctl;
1055 int s_ioctl;
1056 } ifra[] = {
1057 {"IFADDR", "addr", SIOCGIFADDR, SIOCSIFADDR},
1058 {"DSTADDR", "destination addr", SIOCGIFDSTADDR, SIOCSIFDSTADDR},
1059 {"BRDADDR", "broadcast addr", SIOCGIFBRDADDR, SIOCSIFBRDADDR},
1060 {"NETMASK", "netmask", SIOCGIFNETMASK, SIOCSIFNETMASK},
1061 {NULL, NULL, 0, 0},
1062 };
1063
1064 for (i = 0; ifra[i].req_name; i++) {
1065 strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
1066 res = ioctl(skfd, ifra[i].g_ioctl, &ifr);
1067 if (res < 0) {
1068 int saved_errno = errno;
1069
1070 v_print("Interface '%s': Error: SIOCG%s failed: %s\n",
1071 master_ifname, ifra[i].req_name,
1072 strerror(saved_errno));
1073
1074 ifr.ifr_addr.sa_family = AF_INET;
1075 memset(ifr.ifr_addr.sa_data, 0,
1076 sizeof(ifr.ifr_addr.sa_data));
1077 }
1078
1079 strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
1080 res = ioctl(skfd, ifra[i].s_ioctl, &ifr);
1081 if (res < 0) {
1082 int saved_errno = errno;
1083
1084 v_print("Interface '%s': Error: SIOCS%s failed: %s\n",
1085 slave_ifname, ifra[i].req_name,
1086 strerror(saved_errno));
1087
1088 return res;
1089 }
1090
1091 ipaddr = ifr.ifr_addr.sa_data;
1092 v_print("Interface '%s': set IP %s to %d.%d.%d.%d\n",
1093 slave_ifname, ifra[i].desc,
1094 ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
1095 }
1096
1097 return 0;
1098}
1099
1100/*
1101 * Local variables:
1102 * version-control: t
1103 * kept-new-versions: 5
1104 * c-indent-level: 4
1105 * c-basic-offset: 4
1106 * tab-width: 4
1107 * compile-command: "gcc -Wall -Wstrict-prototypes -O -I/usr/src/linux/include ifenslave.c -o ifenslave"
1108 * End:
1109 */
1110
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 10:57:00 -0500