1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
|
/*
* Common ioctl functions.
* Copyright (C) 1997, 98 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "linklist.h"
#include "if.h"
#include "prefix.h"
#include "ioctl.h"
#include "log.h"
#include "privs.h"
#include "lib_errors.h"
#include "vty.h"
#include "zebra/rib.h"
#include "zebra/rt.h"
#include "zebra/interface.h"
#include "zebra/zebra_errors.h"
#ifndef SUNOS_5
#ifdef HAVE_BSD_LINK_DETECT
#include <net/if_media.h>
#endif /* HAVE_BSD_LINK_DETECT*/
extern struct zebra_privs_t zserv_privs;
/* clear and set interface name string */
void ifreq_set_name(struct ifreq *ifreq, struct interface *ifp)
{
strlcpy(ifreq->ifr_name, ifp->name, sizeof(ifreq->ifr_name));
}
/* call ioctl system call */
int if_ioctl(unsigned long request, caddr_t buffer)
{
int sock;
int ret;
int err = 0;
frr_elevate_privs(&zserv_privs) {
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
zlog_err("Cannot create UDP socket: %s",
safe_strerror(errno));
exit(1);
}
if ((ret = ioctl(sock, request, buffer)) < 0)
err = errno;
}
close(sock);
if (ret < 0) {
errno = err;
return ret;
}
return 0;
}
/* call ioctl system call */
int vrf_if_ioctl(unsigned long request, caddr_t buffer, vrf_id_t vrf_id)
{
int sock;
int ret;
int err = 0;
frr_elevate_privs(&zserv_privs) {
sock = vrf_socket(AF_INET, SOCK_DGRAM, 0, vrf_id, NULL);
if (sock < 0) {
zlog_err("Cannot create UDP socket: %s",
safe_strerror(errno));
exit(1);
}
ret = vrf_ioctl(vrf_id, sock, request, buffer);
if (ret < 0)
err = errno;
}
close(sock);
if (ret < 0) {
errno = err;
return ret;
}
return 0;
}
#ifndef HAVE_NETLINK
static int if_ioctl_ipv6(unsigned long request, caddr_t buffer)
{
int sock;
int ret;
int err = 0;
frr_elevate_privs(&zserv_privs) {
sock = socket(AF_INET6, SOCK_DGRAM, 0);
if (sock < 0) {
zlog_err("Cannot create IPv6 datagram socket: %s",
safe_strerror(errno));
exit(1);
}
if ((ret = ioctl(sock, request, buffer)) < 0)
err = errno;
}
close(sock);
if (ret < 0) {
errno = err;
return ret;
}
return 0;
}
#endif /* ! HAVE_NETLINK */
/*
* get interface metric
* -- if value is not avaliable set -1
*/
void if_get_metric(struct interface *ifp)
{
#ifdef SIOCGIFMETRIC
struct ifreq ifreq;
ifreq_set_name(&ifreq, ifp);
if (vrf_if_ioctl(SIOCGIFMETRIC, (caddr_t)&ifreq, ifp->vrf_id) < 0)
return;
ifp->metric = ifreq.ifr_metric;
if (ifp->metric == 0)
ifp->metric = 1;
#else /* SIOCGIFMETRIC */
ifp->metric = -1;
#endif /* SIOCGIFMETRIC */
}
/* get interface MTU */
void if_get_mtu(struct interface *ifp)
{
struct ifreq ifreq;
ifreq_set_name(&ifreq, ifp);
#if defined(SIOCGIFMTU)
if (vrf_if_ioctl(SIOCGIFMTU, (caddr_t)&ifreq, ifp->vrf_id) < 0) {
zlog_info("Can't lookup mtu by ioctl(SIOCGIFMTU)");
ifp->mtu6 = ifp->mtu = -1;
return;
}
#ifdef SUNOS_5
ifp->mtu6 = ifp->mtu = ifreq.ifr_metric;
#else
ifp->mtu6 = ifp->mtu = ifreq.ifr_mtu;
#endif /* SUNOS_5 */
/* propogate */
zebra_interface_up_update(ifp);
#else
zlog_info("Can't lookup mtu on this system");
ifp->mtu6 = ifp->mtu = -1;
#endif
}
#ifdef HAVE_NETLINK
/* Interface address setting via netlink interface. */
int if_set_prefix(struct interface *ifp, struct connected *ifc)
{
return kernel_address_add_ipv4(ifp, ifc);
}
/* Interface address is removed using netlink interface. */
int if_unset_prefix(struct interface *ifp, struct connected *ifc)
{
return kernel_address_delete_ipv4(ifp, ifc);
}
#else /* ! HAVE_NETLINK */
#ifdef HAVE_STRUCT_IFALIASREQ
/* Set up interface's IP address, netmask (and broadcas? ). *BSD may
has ifaliasreq structure. */
int if_set_prefix(struct interface *ifp, struct connected *ifc)
{
int ret;
struct ifaliasreq addreq;
struct sockaddr_in addr, mask, peer;
struct prefix_ipv4 *p;
/* don't configure PtP addresses on broadcast ifs or reverse */
if (!(ifp->flags & IFF_POINTOPOINT) != !CONNECTED_PEER(ifc)) {
errno = EINVAL;
return -1;
}
p = (struct prefix_ipv4 *)ifc->address;
rib_lookup_and_pushup(p, ifp->vrf_id);
memset(&addreq, 0, sizeof addreq);
strncpy((char *)&addreq.ifra_name, ifp->name, sizeof addreq.ifra_name);
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_addr = p->prefix;
addr.sin_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
addr.sin_len = sizeof(struct sockaddr_in);
#endif
memcpy(&addreq.ifra_addr, &addr, sizeof(struct sockaddr_in));
if (CONNECTED_PEER(ifc)) {
p = (struct prefix_ipv4 *)ifc->destination;
memset(&mask, 0, sizeof(struct sockaddr_in));
peer.sin_addr = p->prefix;
peer.sin_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
peer.sin_len = sizeof(struct sockaddr_in);
#endif
memcpy(&addreq.ifra_broadaddr, &peer,
sizeof(struct sockaddr_in));
}
memset(&mask, 0, sizeof(struct sockaddr_in));
masklen2ip(p->prefixlen, &mask.sin_addr);
mask.sin_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
mask.sin_len = sizeof(struct sockaddr_in);
#endif
memcpy(&addreq.ifra_mask, &mask, sizeof(struct sockaddr_in));
ret = if_ioctl(SIOCAIFADDR, (caddr_t)&addreq);
if (ret < 0)
return ret;
return 0;
}
/* Set up interface's IP address, netmask (and broadcas? ). *BSD may
has ifaliasreq structure. */
int if_unset_prefix(struct interface *ifp, struct connected *ifc)
{
int ret;
struct ifaliasreq addreq;
struct sockaddr_in addr, mask, peer;
struct prefix_ipv4 *p;
/* this would probably wreak havoc */
if (!(ifp->flags & IFF_POINTOPOINT) != !CONNECTED_PEER(ifc)) {
errno = EINVAL;
return -1;
}
p = (struct prefix_ipv4 *)ifc->address;
memset(&addreq, 0, sizeof addreq);
strncpy((char *)&addreq.ifra_name, ifp->name, sizeof addreq.ifra_name);
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_addr = p->prefix;
addr.sin_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
addr.sin_len = sizeof(struct sockaddr_in);
#endif
memcpy(&addreq.ifra_addr, &addr, sizeof(struct sockaddr_in));
if (CONNECTED_PEER(ifc)) {
p = (struct prefix_ipv4 *)ifc->destination;
memset(&mask, 0, sizeof(struct sockaddr_in));
peer.sin_addr = p->prefix;
peer.sin_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
peer.sin_len = sizeof(struct sockaddr_in);
#endif
memcpy(&addreq.ifra_broadaddr, &peer,
sizeof(struct sockaddr_in));
}
memset(&mask, 0, sizeof(struct sockaddr_in));
masklen2ip(p->prefixlen, &mask.sin_addr);
mask.sin_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
mask.sin_len = sizeof(struct sockaddr_in);
#endif
memcpy(&addreq.ifra_mask, &mask, sizeof(struct sockaddr_in));
ret = if_ioctl(SIOCDIFADDR, (caddr_t)&addreq);
if (ret < 0)
return ret;
return 0;
}
#else
/* Set up interface's address, netmask (and broadcas? ). Linux or
Solaris uses ifname:number semantics to set IP address aliases. */
int if_set_prefix(struct interface *ifp, struct connected *ifc)
{
int ret;
struct ifreq ifreq;
struct sockaddr_in addr;
struct sockaddr_in broad;
struct sockaddr_in mask;
struct prefix_ipv4 ifaddr;
struct prefix_ipv4 *p;
p = (struct prefix_ipv4 *)ifc->address;
ifaddr = *p;
ifreq_set_name(&ifreq, ifp);
addr.sin_addr = p->prefix;
addr.sin_family = p->family;
memcpy(&ifreq.ifr_addr, &addr, sizeof(struct sockaddr_in));
ret = if_ioctl(SIOCSIFADDR, (caddr_t)&ifreq);
if (ret < 0)
return ret;
/* We need mask for make broadcast addr. */
masklen2ip(p->prefixlen, &mask.sin_addr);
if (if_is_broadcast(ifp)) {
apply_mask_ipv4(&ifaddr);
addr.sin_addr = ifaddr.prefix;
broad.sin_addr.s_addr =
(addr.sin_addr.s_addr | ~mask.sin_addr.s_addr);
broad.sin_family = p->family;
memcpy(&ifreq.ifr_broadaddr, &broad,
sizeof(struct sockaddr_in));
ret = if_ioctl(SIOCSIFBRDADDR, (caddr_t)&ifreq);
if (ret < 0)
return ret;
}
mask.sin_family = p->family;
#ifdef SUNOS_5
memcpy(&mask, &ifreq.ifr_addr, sizeof(mask));
#else
memcpy(&ifreq.ifr_netmask, &mask, sizeof(struct sockaddr_in));
#endif /* SUNOS5 */
ret = if_ioctl(SIOCSIFNETMASK, (caddr_t)&ifreq);
if (ret < 0)
return ret;
return 0;
}
/* Set up interface's address, netmask (and broadcas? ). Linux or
Solaris uses ifname:number semantics to set IP address aliases. */
int if_unset_prefix(struct interface *ifp, struct connected *ifc)
{
int ret;
struct ifreq ifreq;
struct sockaddr_in addr;
struct prefix_ipv4 *p;
p = (struct prefix_ipv4 *)ifc->address;
ifreq_set_name(&ifreq, ifp);
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_family = p->family;
memcpy(&ifreq.ifr_addr, &addr, sizeof(struct sockaddr_in));
ret = if_ioctl(SIOCSIFADDR, (caddr_t)&ifreq);
if (ret < 0)
return ret;
return 0;
}
#endif /* HAVE_STRUCT_IFALIASREQ */
#endif /* HAVE_NETLINK */
/* get interface flags */
void if_get_flags(struct interface *ifp)
{
int ret;
struct ifreq ifreq;
#ifdef HAVE_BSD_LINK_DETECT
struct ifmediareq ifmr;
#endif /* HAVE_BSD_LINK_DETECT */
ifreq_set_name(&ifreq, ifp);
ret = vrf_if_ioctl(SIOCGIFFLAGS, (caddr_t)&ifreq, ifp->vrf_id);
if (ret < 0) {
flog_err_sys(EC_LIB_SYSTEM_CALL,
"vrf_if_ioctl(SIOCGIFFLAGS) failed: %s",
safe_strerror(errno));
return;
}
#ifdef HAVE_BSD_LINK_DETECT /* Detect BSD link-state at start-up */
/* Per-default, IFF_RUNNING is held high, unless link-detect says
* otherwise - we abuse IFF_RUNNING inside zebra as a link-state flag,
* following practice on Linux and Solaris kernels
*/
SET_FLAG(ifreq.ifr_flags, IFF_RUNNING);
if (CHECK_FLAG(ifp->status, ZEBRA_INTERFACE_LINKDETECTION)) {
(void)memset(&ifmr, 0, sizeof(ifmr));
strncpy(ifmr.ifm_name, ifp->name, IFNAMSIZ);
/* Seems not all interfaces implement this ioctl */
if (if_ioctl(SIOCGIFMEDIA, (caddr_t)&ifmr) == -1 &&
errno != EINVAL)
flog_err_sys(EC_LIB_SYSTEM_CALL,
"if_ioctl(SIOCGIFMEDIA) failed: %s",
safe_strerror(errno));
else if (ifmr.ifm_status & IFM_AVALID) /* Link state is valid */
{
if (ifmr.ifm_status & IFM_ACTIVE)
SET_FLAG(ifreq.ifr_flags, IFF_RUNNING);
else
UNSET_FLAG(ifreq.ifr_flags, IFF_RUNNING);
}
}
#endif /* HAVE_BSD_LINK_DETECT */
if_flags_update(ifp, (ifreq.ifr_flags & 0x0000ffff));
}
/* Set interface flags */
int if_set_flags(struct interface *ifp, uint64_t flags)
{
int ret;
struct ifreq ifreq;
memset(&ifreq, 0, sizeof(struct ifreq));
ifreq_set_name(&ifreq, ifp);
ifreq.ifr_flags = ifp->flags;
ifreq.ifr_flags |= flags;
ret = vrf_if_ioctl(SIOCSIFFLAGS, (caddr_t)&ifreq, ifp->vrf_id);
if (ret < 0) {
zlog_info("can't set interface flags");
return ret;
}
return 0;
}
/* Unset interface's flag. */
int if_unset_flags(struct interface *ifp, uint64_t flags)
{
int ret;
struct ifreq ifreq;
memset(&ifreq, 0, sizeof(struct ifreq));
ifreq_set_name(&ifreq, ifp);
ifreq.ifr_flags = ifp->flags;
ifreq.ifr_flags &= ~flags;
ret = vrf_if_ioctl(SIOCSIFFLAGS, (caddr_t)&ifreq, ifp->vrf_id);
if (ret < 0) {
zlog_info("can't unset interface flags");
return ret;
}
return 0;
}
#ifdef LINUX_IPV6
#ifndef _LINUX_IN6_H
/* linux/include/net/ipv6.h */
struct in6_ifreq {
struct in6_addr ifr6_addr;
uint32_t ifr6_prefixlen;
int ifr6_ifindex;
};
#endif /* _LINUX_IN6_H */
/* Interface's address add/delete functions. */
int if_prefix_add_ipv6(struct interface *ifp, struct connected *ifc)
{
#ifdef HAVE_NETLINK
return kernel_address_add_ipv6(ifp, ifc);
#endif /* HAVE_NETLINK */
}
int if_prefix_delete_ipv6(struct interface *ifp, struct connected *ifc)
{
#ifdef HAVE_NETLINK
return kernel_address_delete_ipv6(ifp, ifc);
#endif /* HAVE_NETLINK */
}
#else /* LINUX_IPV6 */
#ifdef HAVE_STRUCT_IN6_ALIASREQ
#ifndef ND6_INFINITE_LIFETIME
#define ND6_INFINITE_LIFETIME 0xffffffffL
#endif /* ND6_INFINITE_LIFETIME */
int if_prefix_add_ipv6(struct interface *ifp, struct connected *ifc)
{
int ret;
struct in6_aliasreq addreq;
struct sockaddr_in6 addr;
struct sockaddr_in6 mask;
struct prefix_ipv6 *p;
p = (struct prefix_ipv6 *)ifc->address;
memset(&addreq, 0, sizeof addreq);
strncpy((char *)&addreq.ifra_name, ifp->name, sizeof addreq.ifra_name);
memset(&addr, 0, sizeof(struct sockaddr_in6));
addr.sin6_addr = p->prefix;
addr.sin6_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
addr.sin6_len = sizeof(struct sockaddr_in6);
#endif
memcpy(&addreq.ifra_addr, &addr, sizeof(struct sockaddr_in6));
memset(&mask, 0, sizeof(struct sockaddr_in6));
masklen2ip6(p->prefixlen, &mask.sin6_addr);
mask.sin6_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
mask.sin6_len = sizeof(struct sockaddr_in6);
#endif
memcpy(&addreq.ifra_prefixmask, &mask, sizeof(struct sockaddr_in6));
addreq.ifra_lifetime.ia6t_vltime = 0xffffffff;
addreq.ifra_lifetime.ia6t_pltime = 0xffffffff;
#ifdef HAVE_STRUCT_IF6_ALIASREQ_IFRA_LIFETIME
addreq.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
addreq.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
#endif
ret = if_ioctl_ipv6(SIOCAIFADDR_IN6, (caddr_t)&addreq);
if (ret < 0)
return ret;
return 0;
}
int if_prefix_delete_ipv6(struct interface *ifp, struct connected *ifc)
{
int ret;
struct in6_aliasreq addreq;
struct sockaddr_in6 addr;
struct sockaddr_in6 mask;
struct prefix_ipv6 *p;
p = (struct prefix_ipv6 *)ifc->address;
memset(&addreq, 0, sizeof addreq);
strncpy((char *)&addreq.ifra_name, ifp->name, sizeof addreq.ifra_name);
memset(&addr, 0, sizeof(struct sockaddr_in6));
addr.sin6_addr = p->prefix;
addr.sin6_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
addr.sin6_len = sizeof(struct sockaddr_in6);
#endif
memcpy(&addreq.ifra_addr, &addr, sizeof(struct sockaddr_in6));
memset(&mask, 0, sizeof(struct sockaddr_in6));
masklen2ip6(p->prefixlen, &mask.sin6_addr);
mask.sin6_family = p->family;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
mask.sin6_len = sizeof(struct sockaddr_in6);
#endif
memcpy(&addreq.ifra_prefixmask, &mask, sizeof(struct sockaddr_in6));
#ifdef HAVE_STRUCT_IF6_ALIASREQ_IFRA_LIFETIME
addreq.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
addreq.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
#endif
ret = if_ioctl_ipv6(SIOCDIFADDR_IN6, (caddr_t)&addreq);
if (ret < 0)
return ret;
return 0;
}
#else
int if_prefix_add_ipv6(struct interface *ifp, struct connected *ifc)
{
return 0;
}
int if_prefix_delete_ipv6(struct interface *ifp, struct connected *ifc)
{
return 0;
}
#endif /* HAVE_STRUCT_IN6_ALIASREQ */
#endif /* LINUX_IPV6 */
#endif /* !SUNOS_5 */
|