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1 /* Kernel communication using routing socket.
2 * Copyright (C) 1999 Kunihiro Ishiguro
3 *
4 * This file is part of GNU Zebra.
5 *
6 * GNU Zebra is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2, or (at your option) any
9 * later version.
10 *
11 * GNU Zebra is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <zebra.h>
22
23 #ifndef HAVE_NETLINK
24
25 #include <net/if_types.h>
26 #ifdef __OpenBSD__
27 #include <netmpls/mpls.h>
28 #endif
29
30 #include "if.h"
31 #include "prefix.h"
32 #include "sockunion.h"
33 #include "connected.h"
34 #include "memory.h"
35 #include "zebra_memory.h"
36 #include "ioctl.h"
37 #include "log.h"
38 #include "table.h"
39 #include "rib.h"
40 #include "privs.h"
41 #include "vrf.h"
42
43 #include "zebra/rt.h"
44 #include "zebra/interface.h"
45 #include "zebra/zserv.h"
46 #include "zebra/debug.h"
47 #include "zebra/kernel_socket.h"
48 #include "zebra/rib.h"
49
50 extern struct zebra_privs_t zserv_privs;
51
52 /*
53 * Historically, the BSD routing socket has aligned data following a
54 * struct sockaddr to sizeof(long), which was 4 bytes on some
55 * platforms, and 8 bytes on others. NetBSD 6 changed the routing
56 * socket to align to sizeof(uint64_t), which is 8 bytes. OS X
57 * appears to align to sizeof(int), which is 4 bytes.
58 *
59 * Alignment of zero-sized sockaddrs is nonsensical, but historically
60 * BSD defines RT_ROUNDUP(0) to be the alignment interval (rather than
61 * 0). We follow this practice without questioning it, but it is a
62 * bug if quagga calls ROUNDUP with 0.
63 */
64
65 /*
66 * Because of these varying conventions, the only sane approach is for
67 * the <net/route.h> header to define some flavor of ROUNDUP macro.
68 */
69
70 #if defined(SA_SIZE)
71 /* SAROUNDUP is the only thing we need, and SA_SIZE provides that */
72 #define SAROUNDUP(a) SA_SIZE(a)
73 #else /* !SA_SIZE */
74
75 #if defined(RT_ROUNDUP)
76 #define ROUNDUP(a) RT_ROUNDUP(a)
77 #endif /* defined(RT_ROUNDUP) */
78
79 #if defined(SUNOS_5)
80 /* Solaris has struct sockaddr_in[6] definitions at 16 / 32 bytes size,
81 * so the whole concept doesn't really apply. */
82 #define ROUNDUP(a) (a)
83 #endif
84
85 /*
86 * If ROUNDUP has not yet been defined in terms of platform-provided
87 * defines, attempt to cope with heuristics.
88 */
89 #if !defined(ROUNDUP)
90
91 /*
92 * If you're porting to a platform that changed RT_ROUNDUP but doesn't
93 * have it in its headers, this will break rather obviously and you'll
94 * have to fix it here.
95 */
96
97 /* OS X (Xcode as of 2014-12) is known not to define RT_ROUNDUP */
98 #ifdef __APPLE__
99 #define ROUNDUP_TYPE int
100 #else
101 #define ROUNDUP_TYPE long
102 #endif
103
104 #define ROUNDUP(a) \
105 ((a) > 0 ? (1 + (((a)-1) | (sizeof(ROUNDUP_TYPE) - 1))) \
106 : sizeof(ROUNDUP_TYPE))
107
108 #endif /* defined(ROUNDUP) */
109
110 /*
111 * Given a pointer (sockaddr or void *), return the number of bytes
112 * taken up by the sockaddr and any padding needed for alignment.
113 */
114 #if defined(HAVE_STRUCT_SOCKADDR_SA_LEN)
115 #define SAROUNDUP(X) ROUNDUP(((struct sockaddr *)(X))->sa_len)
116 #else
117 /*
118 * One would hope all fixed-size structure definitions are aligned,
119 * but round them up nonetheless.
120 */
121 #define SAROUNDUP(X) \
122 (((struct sockaddr *)(X))->sa_family == AF_INET \
123 ? ROUNDUP(sizeof(struct sockaddr_in)) \
124 : (((struct sockaddr *)(X))->sa_family == AF_INET6 \
125 ? ROUNDUP(sizeof(struct sockaddr_in6)) \
126 : (((struct sockaddr *)(X))->sa_family == AF_LINK \
127 ? ROUNDUP(sizeof(struct sockaddr_dl)) \
128 : sizeof(struct sockaddr))))
129 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
130
131 #endif /* !SA_SIZE */
132
133 /*
134 * We use a call to an inline function to copy (PNT) to (DEST)
135 * 1. Calculating the length of the copy requires an #ifdef to determine
136 * if sa_len is a field and can't be used directly inside a #define
137 * 2. So the compiler doesn't complain when DEST is NULL, which is only true
138 * when we are skipping the copy and incrementing to the next SA
139 */
140 static inline void rta_copy(union sockunion *dest, caddr_t src)
141 {
142 int len;
143 if (!dest)
144 return;
145 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
146 len = (((struct sockaddr *)src)->sa_len > sizeof(*dest))
147 ? sizeof(*dest)
148 : ((struct sockaddr *)src)->sa_len;
149 #else
150 len = (SAROUNDUP(src) > sizeof(*dest)) ? sizeof(*dest) : SAROUNDUP(src);
151 #endif
152 memcpy(dest, src, len);
153 }
154
155 #define RTA_ADDR_GET(DEST, RTA, RTMADDRS, PNT) \
156 if ((RTMADDRS) & (RTA)) { \
157 int len = SAROUNDUP((PNT)); \
158 if (af_check(((struct sockaddr *)(PNT))->sa_family)) \
159 rta_copy((DEST), (PNT)); \
160 (PNT) += len; \
161 }
162 #define RTA_ATTR_GET(DEST, RTA, RTMADDRS, PNT) \
163 if ((RTMADDRS) & (RTA)) { \
164 int len = SAROUNDUP((PNT)); \
165 rta_copy((DEST), (PNT)); \
166 (PNT) += len; \
167 }
168
169 #define RTA_NAME_GET(DEST, RTA, RTMADDRS, PNT, LEN) \
170 if ((RTMADDRS) & (RTA)) { \
171 u_char *pdest = (u_char *)(DEST); \
172 int len = SAROUNDUP((PNT)); \
173 struct sockaddr_dl *sdl = (struct sockaddr_dl *)(PNT); \
174 if (IS_ZEBRA_DEBUG_KERNEL) \
175 zlog_debug("%s: RTA_SDL_GET nlen %d, alen %d", \
176 __func__, sdl->sdl_nlen, sdl->sdl_alen); \
177 if (((DEST) != NULL) && (sdl->sdl_family == AF_LINK) \
178 && (sdl->sdl_nlen < IFNAMSIZ) && (sdl->sdl_nlen <= len)) { \
179 memcpy(pdest, sdl->sdl_data, sdl->sdl_nlen); \
180 pdest[sdl->sdl_nlen] = '\0'; \
181 (LEN) = sdl->sdl_nlen; \
182 } \
183 (PNT) += len; \
184 } else { \
185 (LEN) = 0; \
186 }
187 /* Routing socket message types. */
188 const struct message rtm_type_str[] = {{RTM_ADD, "RTM_ADD"},
189 {RTM_DELETE, "RTM_DELETE"},
190 {RTM_CHANGE, "RTM_CHANGE"},
191 {RTM_GET, "RTM_GET"},
192 {RTM_LOSING, "RTM_LOSING"},
193 {RTM_REDIRECT, "RTM_REDIRECT"},
194 {RTM_MISS, "RTM_MISS"},
195 {RTM_LOCK, "RTM_LOCK"},
196 #ifdef OLDADD
197 {RTM_OLDADD, "RTM_OLDADD"},
198 #endif /* RTM_OLDADD */
199 #ifdef RTM_OLDDEL
200 {RTM_OLDDEL, "RTM_OLDDEL"},
201 #endif /* RTM_OLDDEL */
202 {RTM_RESOLVE, "RTM_RESOLVE"},
203 {RTM_NEWADDR, "RTM_NEWADDR"},
204 {RTM_DELADDR, "RTM_DELADDR"},
205 {RTM_IFINFO, "RTM_IFINFO"},
206 #ifdef RTM_OIFINFO
207 {RTM_OIFINFO, "RTM_OIFINFO"},
208 #endif /* RTM_OIFINFO */
209 #ifdef RTM_NEWMADDR
210 {RTM_NEWMADDR, "RTM_NEWMADDR"},
211 #endif /* RTM_NEWMADDR */
212 #ifdef RTM_DELMADDR
213 {RTM_DELMADDR, "RTM_DELMADDR"},
214 #endif /* RTM_DELMADDR */
215 #ifdef RTM_IFANNOUNCE
216 {RTM_IFANNOUNCE, "RTM_IFANNOUNCE"},
217 #endif /* RTM_IFANNOUNCE */
218 {0}};
219
220 static const struct message rtm_flag_str[] = {{RTF_UP, "UP"},
221 {RTF_GATEWAY, "GATEWAY"},
222 {RTF_HOST, "HOST"},
223 {RTF_REJECT, "REJECT"},
224 {RTF_DYNAMIC, "DYNAMIC"},
225 {RTF_MODIFIED, "MODIFIED"},
226 {RTF_DONE, "DONE"},
227 #ifdef RTF_MASK
228 {RTF_MASK, "MASK"},
229 #endif /* RTF_MASK */
230 #ifdef RTF_CLONING
231 {RTF_CLONING, "CLONING"},
232 #endif /* RTF_CLONING */
233 #ifdef RTF_XRESOLVE
234 {RTF_XRESOLVE, "XRESOLVE"},
235 #endif /* RTF_XRESOLVE */
236 #ifdef RTF_LLINFO
237 {RTF_LLINFO, "LLINFO"},
238 #endif /* RTF_LLINFO */
239 {RTF_STATIC, "STATIC"},
240 {RTF_BLACKHOLE, "BLACKHOLE"},
241 #ifdef RTF_PRIVATE
242 {RTF_PRIVATE, "PRIVATE"},
243 #endif /* RTF_PRIVATE */
244 {RTF_PROTO1, "PROTO1"},
245 {RTF_PROTO2, "PROTO2"},
246 #ifdef RTF_PRCLONING
247 {RTF_PRCLONING, "PRCLONING"},
248 #endif /* RTF_PRCLONING */
249 #ifdef RTF_WASCLONED
250 {RTF_WASCLONED, "WASCLONED"},
251 #endif /* RTF_WASCLONED */
252 #ifdef RTF_PROTO3
253 {RTF_PROTO3, "PROTO3"},
254 #endif /* RTF_PROTO3 */
255 #ifdef RTF_PINNED
256 {RTF_PINNED, "PINNED"},
257 #endif /* RTF_PINNED */
258 #ifdef RTF_LOCAL
259 {RTF_LOCAL, "LOCAL"},
260 #endif /* RTF_LOCAL */
261 #ifdef RTF_BROADCAST
262 {RTF_BROADCAST, "BROADCAST"},
263 #endif /* RTF_BROADCAST */
264 #ifdef RTF_MULTICAST
265 {RTF_MULTICAST, "MULTICAST"},
266 #endif /* RTF_MULTICAST */
267 #ifdef RTF_MULTIRT
268 {RTF_MULTIRT, "MULTIRT"},
269 #endif /* RTF_MULTIRT */
270 #ifdef RTF_SETSRC
271 {RTF_SETSRC, "SETSRC"},
272 #endif /* RTF_SETSRC */
273 {0}};
274
275 /* Kernel routing update socket. */
276 int routing_sock = -1;
277
278 /* Yes I'm checking ugly routing socket behavior. */
279 /* #define DEBUG */
280
281 /* Supported address family check. */
282 static inline int af_check(int family)
283 {
284 if (family == AF_INET)
285 return 1;
286 if (family == AF_INET6)
287 return 1;
288 return 0;
289 }
290
291 /* Dump routing table flag for debug purpose. */
292 static void rtm_flag_dump(int flag)
293 {
294 const struct message *mes;
295 static char buf[BUFSIZ];
296
297 buf[0] = '\0';
298 for (mes = rtm_flag_str; mes->key != 0; mes++) {
299 if (mes->key & flag) {
300 strlcat(buf, mes->str, BUFSIZ);
301 strlcat(buf, " ", BUFSIZ);
302 }
303 }
304 zlog_debug("Kernel: %s", buf);
305 }
306
307 #ifdef RTM_IFANNOUNCE
308 /* Interface adding function */
309 static int ifan_read(struct if_announcemsghdr *ifan)
310 {
311 struct interface *ifp;
312
313 ifp = if_lookup_by_index(ifan->ifan_index, VRF_DEFAULT);
314
315 if (ifp)
316 assert((ifp->ifindex == ifan->ifan_index)
317 || (ifp->ifindex == IFINDEX_INTERNAL));
318
319 if ((ifp == NULL) || ((ifp->ifindex == IFINDEX_INTERNAL)
320 && (ifan->ifan_what == IFAN_ARRIVAL))) {
321 if (IS_ZEBRA_DEBUG_KERNEL)
322 zlog_debug(
323 "%s: creating interface for ifindex %d, name %s",
324 __func__, ifan->ifan_index, ifan->ifan_name);
325
326 /* Create Interface */
327 ifp = if_get_by_name(ifan->ifan_name, VRF_DEFAULT, 0);
328 if_set_index(ifp, ifan->ifan_index);
329
330 if_get_metric(ifp);
331 if_add_update(ifp);
332 } else if (ifp != NULL && ifan->ifan_what == IFAN_DEPARTURE)
333 if_delete_update(ifp);
334
335 if_get_flags(ifp);
336 if_get_mtu(ifp);
337 if_get_metric(ifp);
338
339 if (IS_ZEBRA_DEBUG_KERNEL)
340 zlog_debug("%s: interface %s index %d", __func__,
341 ifan->ifan_name, ifan->ifan_index);
342
343 return 0;
344 }
345 #endif /* RTM_IFANNOUNCE */
346
347 #ifdef HAVE_BSD_IFI_LINK_STATE
348 /* BSD link detect translation */
349 static void bsd_linkdetect_translate(struct if_msghdr *ifm)
350 {
351 if ((ifm->ifm_data.ifi_link_state >= LINK_STATE_UP)
352 || (ifm->ifm_data.ifi_link_state == LINK_STATE_UNKNOWN))
353 SET_FLAG(ifm->ifm_flags, IFF_RUNNING);
354 else
355 UNSET_FLAG(ifm->ifm_flags, IFF_RUNNING);
356 }
357 #endif /* HAVE_BSD_IFI_LINK_STATE */
358
359 static enum zebra_link_type sdl_to_zebra_link_type(unsigned int sdlt)
360 {
361 switch (sdlt) {
362 case IFT_ETHER:
363 return ZEBRA_LLT_ETHER;
364 case IFT_X25:
365 return ZEBRA_LLT_X25;
366 case IFT_FDDI:
367 return ZEBRA_LLT_FDDI;
368 case IFT_PPP:
369 return ZEBRA_LLT_PPP;
370 case IFT_LOOP:
371 return ZEBRA_LLT_LOOPBACK;
372 case IFT_SLIP:
373 return ZEBRA_LLT_SLIP;
374 case IFT_ARCNET:
375 return ZEBRA_LLT_ARCNET;
376 case IFT_ATM:
377 return ZEBRA_LLT_ATM;
378 case IFT_LOCALTALK:
379 return ZEBRA_LLT_LOCALTLK;
380 case IFT_HIPPI:
381 return ZEBRA_LLT_HIPPI;
382 #ifdef IFT_IEEE1394
383 case IFT_IEEE1394:
384 return ZEBRA_LLT_IEEE1394;
385 #endif
386
387 default:
388 return ZEBRA_LLT_UNKNOWN;
389 }
390 }
391
392 /*
393 * Handle struct if_msghdr obtained from reading routing socket or
394 * sysctl (from interface_list). There may or may not be sockaddrs
395 * present after the header.
396 */
397 int ifm_read(struct if_msghdr *ifm)
398 {
399 struct interface *ifp = NULL;
400 struct sockaddr_dl *sdl;
401 char ifname[IFNAMSIZ];
402 short ifnlen = 0;
403 caddr_t cp;
404
405 /* terminate ifname at head (for strnlen) and tail (for safety) */
406 ifname[IFNAMSIZ - 1] = '\0';
407
408 /* paranoia: sanity check structure */
409 if (ifm->ifm_msglen < sizeof(struct if_msghdr)) {
410 zlog_err("ifm_read: ifm->ifm_msglen %d too short\n",
411 ifm->ifm_msglen);
412 return -1;
413 }
414
415 /*
416 * Check for a sockaddr_dl following the message. First, point to
417 * where a socakddr might be if one follows the message.
418 */
419 cp = (void *)(ifm + 1);
420
421 #ifdef SUNOS_5
422 /*
423 * XXX This behavior should be narrowed to only the kernel versions
424 * for which the structures returned do not match the headers.
425 *
426 * if_msghdr_t on 64 bit kernels in Solaris 9 and earlier versions
427 * is 12 bytes larger than the 32 bit version.
428 */
429 if (((struct sockaddr *)cp)->sa_family == AF_UNSPEC)
430 cp = cp + 12;
431 #endif
432
433 RTA_ADDR_GET(NULL, RTA_DST, ifm->ifm_addrs, cp);
434 RTA_ADDR_GET(NULL, RTA_GATEWAY, ifm->ifm_addrs, cp);
435 RTA_ATTR_GET(NULL, RTA_NETMASK, ifm->ifm_addrs, cp);
436 RTA_ADDR_GET(NULL, RTA_GENMASK, ifm->ifm_addrs, cp);
437 sdl = (struct sockaddr_dl *)cp;
438 RTA_NAME_GET(ifname, RTA_IFP, ifm->ifm_addrs, cp, ifnlen);
439 RTA_ADDR_GET(NULL, RTA_IFA, ifm->ifm_addrs, cp);
440 RTA_ADDR_GET(NULL, RTA_AUTHOR, ifm->ifm_addrs, cp);
441 RTA_ADDR_GET(NULL, RTA_BRD, ifm->ifm_addrs, cp);
442 #ifdef RTA_LABEL
443 RTA_ATTR_GET(NULL, RTA_LABEL, ifm->ifm_addrs, cp);
444 #endif
445 #ifdef RTA_SRC
446 RTA_ADDR_GET(NULL, RTA_SRC, ifm->ifm_addrs, cp);
447 #endif
448
449 if (IS_ZEBRA_DEBUG_KERNEL)
450 zlog_debug("%s: sdl ifname %s", __func__,
451 (ifnlen ? ifname : "(nil)"));
452
453 /*
454 * Look up on ifindex first, because ifindices are the primary handle
455 * for
456 * interfaces across the user/kernel boundary, for most systems. (Some
457 * messages, such as up/down status changes on NetBSD, do not include a
458 * sockaddr_dl).
459 */
460 if ((ifp = if_lookup_by_index(ifm->ifm_index, VRF_DEFAULT)) != NULL) {
461 /* we have an ifp, verify that the name matches as some systems,
462 * eg Solaris, have a 1:many association of ifindex:ifname
463 * if they dont match, we dont have the correct ifp and should
464 * set it back to NULL to let next check do lookup by name
465 */
466 if (ifnlen && (strncmp(ifp->name, ifname, IFNAMSIZ) != 0)) {
467 if (IS_ZEBRA_DEBUG_KERNEL)
468 zlog_debug(
469 "%s: ifp name %s doesnt match sdl name %s",
470 __func__, ifp->name, ifname);
471 ifp = NULL;
472 }
473 }
474
475 /*
476 * If we dont have an ifp, try looking up by name. Particularly as some
477 * systems (Solaris) have a 1:many mapping of ifindex:ifname - the
478 * ifname
479 * is therefore our unique handle to that interface.
480 *
481 * Interfaces specified in the configuration file for which the ifindex
482 * has not been determined will have ifindex == IFINDEX_INTERNAL, and
483 * such
484 * interfaces are found by this search, and then their ifindex values
485 * can
486 * be filled in.
487 */
488 if ((ifp == NULL) && ifnlen)
489 ifp = if_lookup_by_name(ifname, VRF_DEFAULT);
490
491 /*
492 * If ifp still does not exist or has an invalid index
493 * (IFINDEX_INTERNAL),
494 * create or fill in an interface.
495 */
496 if ((ifp == NULL) || (ifp->ifindex == IFINDEX_INTERNAL)) {
497 /*
498 * To create or fill in an interface, a sockaddr_dl (via
499 * RTA_IFP) is required.
500 */
501 if (!ifnlen) {
502 zlog_warn("Interface index %d (new) missing ifname\n",
503 ifm->ifm_index);
504 return -1;
505 }
506
507 #ifndef RTM_IFANNOUNCE
508 /* Down->Down interface should be ignored here.
509 * See further comment below.
510 */
511 if (!CHECK_FLAG(ifm->ifm_flags, IFF_UP))
512 return 0;
513 #endif /* !RTM_IFANNOUNCE */
514
515 if (ifp == NULL) {
516 /* Interface that zebra was not previously aware of, so
517 * create. */
518 ifp = if_create(ifname, VRF_DEFAULT);
519 if (IS_ZEBRA_DEBUG_KERNEL)
520 zlog_debug("%s: creating ifp for ifindex %d",
521 __func__, ifm->ifm_index);
522 }
523
524 if (IS_ZEBRA_DEBUG_KERNEL)
525 zlog_debug(
526 "%s: updated/created ifp, ifname %s, ifindex %d",
527 __func__, ifp->name, ifp->ifindex);
528 /*
529 * Fill in newly created interface structure, or larval
530 * structure with ifindex IFINDEX_INTERNAL.
531 */
532 if_set_index(ifp, ifm->ifm_index);
533
534 #ifdef HAVE_BSD_IFI_LINK_STATE /* translate BSD kernel msg for link-state */
535 bsd_linkdetect_translate(ifm);
536 #endif /* HAVE_BSD_IFI_LINK_STATE */
537
538 if_flags_update(ifp, ifm->ifm_flags);
539 #if defined(__bsdi__)
540 if_kvm_get_mtu(ifp);
541 #else
542 if_get_mtu(ifp);
543 #endif /* __bsdi__ */
544 if_get_metric(ifp);
545
546 /*
547 * XXX sockaddr_dl contents can be larger than the structure
548 * definition. There are 2 big families here:
549 * - BSD has sdl_len + sdl_data[16] + overruns sdl_data
550 * we MUST use sdl_len here or we'll truncate data.
551 * - Solaris has no sdl_len, but sdl_data[244]
552 * presumably, it's not going to run past that, so sizeof()
553 * is fine here.
554 * a nonzero ifnlen from RTA_NAME_GET() means sdl is valid
555 */
556 ifp->ll_type = ZEBRA_LLT_UNKNOWN;
557 ifp->hw_addr_len = 0;
558 if (ifnlen) {
559 #ifdef HAVE_STRUCT_SOCKADDR_DL_SDL_LEN
560 memcpy(&((struct zebra_if *)ifp->info)->sdl, sdl,
561 sdl->sdl_len);
562 #else
563 memcpy(&((struct zebra_if *)ifp->info)->sdl, sdl,
564 sizeof(struct sockaddr_dl));
565 #endif /* HAVE_STRUCT_SOCKADDR_DL_SDL_LEN */
566
567 ifp->ll_type = sdl_to_zebra_link_type(sdl->sdl_type);
568 if (sdl->sdl_alen <= sizeof(ifp->hw_addr)) {
569 memcpy(ifp->hw_addr, LLADDR(sdl),
570 sdl->sdl_alen);
571 ifp->hw_addr_len = sdl->sdl_alen;
572 }
573 }
574
575 if_add_update(ifp);
576 } else
577 /*
578 * Interface structure exists. Adjust stored flags from
579 * notification. If interface has up->down or down->up
580 * transition, call state change routines (to adjust routes,
581 * notify routing daemons, etc.). (Other flag changes are stored
582 * but apparently do not trigger action.)
583 */
584 {
585 if (ifp->ifindex != ifm->ifm_index) {
586 zlog_warn(
587 "%s: index mismatch, ifname %s, ifp index %d, "
588 "ifm index %d",
589 __func__, ifp->name, ifp->ifindex,
590 ifm->ifm_index);
591 return -1;
592 }
593
594 #ifdef HAVE_BSD_IFI_LINK_STATE /* translate BSD kernel msg for link-state */
595 bsd_linkdetect_translate(ifm);
596 #endif /* HAVE_BSD_IFI_LINK_STATE */
597
598 /* update flags and handle operative->inoperative transition, if
599 * any */
600 if_flags_update(ifp, ifm->ifm_flags);
601
602 #ifndef RTM_IFANNOUNCE
603 if (!if_is_up(ifp)) {
604 /* No RTM_IFANNOUNCE on this platform, so we can never
605 * distinguish between ~IFF_UP and delete. We must
606 * presume
607 * it has been deleted.
608 * Eg, Solaris will not notify us of unplumb.
609 *
610 * XXX: Fixme - this should be runtime detected
611 * So that a binary compiled on a system with IFANNOUNCE
612 * will still behave correctly if run on a platform
613 * without
614 */
615 if_delete_update(ifp);
616 }
617 #endif /* RTM_IFANNOUNCE */
618 if (if_is_up(ifp)) {
619 #if defined(__bsdi__)
620 if_kvm_get_mtu(ifp);
621 #else
622 if_get_mtu(ifp);
623 #endif /* __bsdi__ */
624 if_get_metric(ifp);
625 }
626 }
627
628 #ifdef HAVE_NET_RT_IFLIST
629 ifp->stats = ifm->ifm_data;
630 #endif /* HAVE_NET_RT_IFLIST */
631 ifp->speed = ifm->ifm_data.ifi_baudrate / 1000000;
632
633 if (IS_ZEBRA_DEBUG_KERNEL)
634 zlog_debug("%s: interface %s index %d", __func__, ifp->name,
635 ifp->ifindex);
636
637 return 0;
638 }
639
640 /* Address read from struct ifa_msghdr. */
641 static void ifam_read_mesg(struct ifa_msghdr *ifm, union sockunion *addr,
642 union sockunion *mask, union sockunion *brd,
643 char *ifname, short *ifnlen)
644 {
645 caddr_t pnt, end;
646 union sockunion dst;
647 union sockunion gateway;
648
649 pnt = (caddr_t)(ifm + 1);
650 end = ((caddr_t)ifm) + ifm->ifam_msglen;
651
652 /* Be sure structure is cleared */
653 memset(mask, 0, sizeof(union sockunion));
654 memset(addr, 0, sizeof(union sockunion));
655 memset(brd, 0, sizeof(union sockunion));
656 memset(&dst, 0, sizeof(union sockunion));
657 memset(&gateway, 0, sizeof(union sockunion));
658
659 /* We fetch each socket variable into sockunion. */
660 RTA_ADDR_GET(&dst, RTA_DST, ifm->ifam_addrs, pnt);
661 RTA_ADDR_GET(&gateway, RTA_GATEWAY, ifm->ifam_addrs, pnt);
662 RTA_ATTR_GET(mask, RTA_NETMASK, ifm->ifam_addrs, pnt);
663 RTA_ADDR_GET(NULL, RTA_GENMASK, ifm->ifam_addrs, pnt);
664 RTA_NAME_GET(ifname, RTA_IFP, ifm->ifam_addrs, pnt, *ifnlen);
665 RTA_ADDR_GET(addr, RTA_IFA, ifm->ifam_addrs, pnt);
666 RTA_ADDR_GET(NULL, RTA_AUTHOR, ifm->ifam_addrs, pnt);
667 RTA_ADDR_GET(brd, RTA_BRD, ifm->ifam_addrs, pnt);
668 #ifdef RTA_LABEL
669 RTA_ATTR_GET(NULL, RTA_LABEL, ifm->ifam_addrs, pnt);
670 #endif
671 #ifdef RTA_SRC
672 RTA_ADDR_GET(NULL, RTA_SRC, ifm->ifam_addrs, pnt);
673 #endif
674
675 if (IS_ZEBRA_DEBUG_KERNEL) {
676 int family = sockunion_family(addr);
677 switch (family) {
678 case AF_INET:
679 case AF_INET6: {
680 char buf[4][INET6_ADDRSTRLEN];
681 zlog_debug(
682 "%s: ifindex %d, ifname %s, ifam_addrs 0x%x, "
683 "ifam_flags 0x%x, addr %s/%d broad %s dst %s "
684 "gateway %s",
685 __func__, ifm->ifam_index,
686 (ifnlen ? ifname : "(nil)"), ifm->ifam_addrs,
687 ifm->ifam_flags,
688 inet_ntop(family, &addr->sin.sin_addr, buf[0],
689 sizeof(buf[0])),
690 ip_masklen(mask->sin.sin_addr),
691 inet_ntop(family, &brd->sin.sin_addr, buf[1],
692 sizeof(buf[1])),
693 inet_ntop(family, &dst.sin.sin_addr, buf[2],
694 sizeof(buf[2])),
695 inet_ntop(family, &gateway.sin.sin_addr, buf[3],
696 sizeof(buf[3])));
697 } break;
698 default:
699 zlog_debug("%s: ifindex %d, ifname %s, ifam_addrs 0x%x",
700 __func__, ifm->ifam_index,
701 (ifnlen ? ifname : "(nil)"),
702 ifm->ifam_addrs);
703 break;
704 }
705 }
706
707 /* Assert read up end point matches to end point */
708 if (pnt != end)
709 zlog_warn("ifam_read() doesn't read all socket data");
710 }
711
712 /* Interface's address information get. */
713 int ifam_read(struct ifa_msghdr *ifam)
714 {
715 struct interface *ifp = NULL;
716 union sockunion addr, mask, brd;
717 char ifname[INTERFACE_NAMSIZ];
718 short ifnlen = 0;
719 char isalias = 0;
720 int flags = 0;
721
722 ifname[0] = ifname[INTERFACE_NAMSIZ - 1] = '\0';
723
724 /* Allocate and read address information. */
725 ifam_read_mesg(ifam, &addr, &mask, &brd, ifname, &ifnlen);
726
727 if ((ifp = if_lookup_by_index(ifam->ifam_index, VRF_DEFAULT)) == NULL) {
728 zlog_warn("%s: no interface for ifname %s, index %d", __func__,
729 ifname, ifam->ifam_index);
730 return -1;
731 }
732
733 if (ifnlen && strncmp(ifp->name, ifname, INTERFACE_NAMSIZ))
734 isalias = 1;
735
736 /* N.B. The info in ifa_msghdr does not tell us whether the RTA_BRD
737 field contains a broadcast address or a peer address, so we are
738 forced to
739 rely upon the interface type. */
740 if (if_is_pointopoint(ifp))
741 SET_FLAG(flags, ZEBRA_IFA_PEER);
742
743 #if 0
744 /* it might seem cute to grab the interface metric here, however
745 * we're processing an address update message, and so some systems
746 * (e.g. FBSD) dont bother to fill in ifam_metric. Disabled, but left
747 * in deliberately, as comment.
748 */
749 ifp->metric = ifam->ifam_metric;
750 #endif
751
752 /* Add connected address. */
753 switch (sockunion_family(&addr)) {
754 case AF_INET:
755 if (ifam->ifam_type == RTM_NEWADDR)
756 connected_add_ipv4(ifp, flags, &addr.sin.sin_addr,
757 ip_masklen(mask.sin.sin_addr),
758 &brd.sin.sin_addr,
759 (isalias ? ifname : NULL));
760 else
761 connected_delete_ipv4(ifp, flags, &addr.sin.sin_addr,
762 ip_masklen(mask.sin.sin_addr),
763 &brd.sin.sin_addr);
764 break;
765 case AF_INET6:
766 /* Unset interface index from link-local address when IPv6 stack
767 is KAME. */
768 if (IN6_IS_ADDR_LINKLOCAL(&addr.sin6.sin6_addr)) {
769 SET_IN6_LINKLOCAL_IFINDEX(addr.sin6.sin6_addr, 0);
770 }
771
772 if (ifam->ifam_type == RTM_NEWADDR)
773 connected_add_ipv6(ifp, flags, &addr.sin6.sin6_addr,
774 ip6_masklen(mask.sin6.sin6_addr),
775 (isalias ? ifname : NULL));
776 else
777 connected_delete_ipv6(ifp, &addr.sin6.sin6_addr,
778 ip6_masklen(mask.sin6.sin6_addr));
779 break;
780 default:
781 /* Unsupported family silently ignore... */
782 break;
783 }
784
785 /* Check interface flag for implicit up of the interface. */
786 if_refresh(ifp);
787
788 #ifdef SUNOS_5
789 /* In addition to lacking IFANNOUNCE, on SUNOS IFF_UP is strange.
790 * See comments for SUNOS_5 in interface.c::if_flags_mangle.
791 *
792 * Here we take care of case where the real IFF_UP was previously
793 * unset (as kept in struct zebra_if.primary_state) and the mangled
794 * IFF_UP (ie IFF_UP set || listcount(connected) has now transitioned
795 * to unset due to the lost non-primary address having DELADDR'd.
796 *
797 * we must delete the interface, because in between here and next
798 * event for this interface-name the administrator could unplumb
799 * and replumb the interface.
800 */
801 if (!if_is_up(ifp))
802 if_delete_update(ifp);
803 #endif /* SUNOS_5 */
804
805 return 0;
806 }
807
808 /* Interface function for reading kernel routing table information. */
809 static int rtm_read_mesg(struct rt_msghdr *rtm, union sockunion *dest,
810 union sockunion *mask, union sockunion *gate,
811 char *ifname, short *ifnlen)
812 {
813 caddr_t pnt, end;
814
815 /* Pnt points out socket data start point. */
816 pnt = (caddr_t)(rtm + 1);
817 end = ((caddr_t)rtm) + rtm->rtm_msglen;
818
819 /* rt_msghdr version check. */
820 if (rtm->rtm_version != RTM_VERSION)
821 zlog_warn(
822 "Routing message version different %d should be %d."
823 "This may cause problem\n",
824 rtm->rtm_version, RTM_VERSION);
825
826 /* Be sure structure is cleared */
827 memset(dest, 0, sizeof(union sockunion));
828 memset(gate, 0, sizeof(union sockunion));
829 memset(mask, 0, sizeof(union sockunion));
830
831 /* We fetch each socket variable into sockunion. */
832 RTA_ADDR_GET(dest, RTA_DST, rtm->rtm_addrs, pnt);
833 RTA_ADDR_GET(gate, RTA_GATEWAY, rtm->rtm_addrs, pnt);
834 RTA_ATTR_GET(mask, RTA_NETMASK, rtm->rtm_addrs, pnt);
835 RTA_ADDR_GET(NULL, RTA_GENMASK, rtm->rtm_addrs, pnt);
836 RTA_NAME_GET(ifname, RTA_IFP, rtm->rtm_addrs, pnt, *ifnlen);
837 RTA_ADDR_GET(NULL, RTA_IFA, rtm->rtm_addrs, pnt);
838 RTA_ADDR_GET(NULL, RTA_AUTHOR, rtm->rtm_addrs, pnt);
839 RTA_ADDR_GET(NULL, RTA_BRD, rtm->rtm_addrs, pnt);
840 #ifdef RTA_LABEL
841 #if 0
842 union sockunion label;
843 memset(&label, 0, sizeof(label));
844 RTA_ATTR_GET(&label, RTA_LABEL, rtm->rtm_addrs, pnt);
845 #endif
846 RTA_ATTR_GET(NULL, RTA_LABEL, rtm->rtm_addrs, pnt);
847 #endif
848 #ifdef RTA_SRC
849 RTA_ADDR_GET(NULL, RTA_SRC, rtm->rtm_addrs, pnt);
850 #endif
851
852 /* If there is netmask information set it's family same as
853 destination family*/
854 if (rtm->rtm_addrs & RTA_NETMASK)
855 mask->sa.sa_family = dest->sa.sa_family;
856
857 /* Assert read up to the end of pointer. */
858 if (pnt != end)
859 zlog_warn("rtm_read() doesn't read all socket data.");
860
861 return rtm->rtm_flags;
862 }
863
864 void rtm_read(struct rt_msghdr *rtm)
865 {
866 int flags;
867 u_char zebra_flags;
868 union sockunion dest, mask, gate;
869 char ifname[INTERFACE_NAMSIZ + 1];
870 short ifnlen = 0;
871 struct nexthop nh;
872
873 zebra_flags = 0;
874
875 /* Read destination and netmask and gateway from rtm message
876 structure. */
877 flags = rtm_read_mesg(rtm, &dest, &mask, &gate, ifname, &ifnlen);
878 if (!(flags & RTF_DONE))
879 return;
880 if (IS_ZEBRA_DEBUG_KERNEL)
881 zlog_debug("%s: got rtm of type %d (%s)", __func__,
882 rtm->rtm_type,
883 lookup_msg(rtm_type_str, rtm->rtm_type, NULL));
884
885 #ifdef RTF_CLONED /*bsdi, netbsd 1.6*/
886 if (flags & RTF_CLONED)
887 return;
888 #endif
889 #ifdef RTF_WASCLONED /*freebsd*/
890 if (flags & RTF_WASCLONED)
891 return;
892 #endif
893
894 if ((rtm->rtm_type == RTM_ADD || rtm->rtm_type == RTM_CHANGE)
895 && !(flags & RTF_UP))
896 return;
897
898 /* This is connected route. */
899 if (!(flags & RTF_GATEWAY))
900 return;
901
902 if (flags & RTF_PROTO1)
903 SET_FLAG(zebra_flags, ZEBRA_FLAG_SELFROUTE);
904
905 /* This is persistent route. */
906 if (flags & RTF_STATIC)
907 SET_FLAG(zebra_flags, ZEBRA_FLAG_STATIC);
908
909 memset(&nh, 0, sizeof(nh));
910
911 nh.vrf_id = VRF_DEFAULT;
912 /* This is a reject or blackhole route */
913 if (flags & RTF_REJECT) {
914 nh.type = NEXTHOP_TYPE_BLACKHOLE;
915 nh.bh_type = BLACKHOLE_REJECT;
916 } else if (flags & RTF_BLACKHOLE) {
917 nh.type = NEXTHOP_TYPE_BLACKHOLE;
918 nh.bh_type = BLACKHOLE_NULL;
919 }
920
921 if (dest.sa.sa_family == AF_INET) {
922 struct prefix p;
923
924 p.family = AF_INET;
925 p.u.prefix4 = dest.sin.sin_addr;
926 if (flags & RTF_HOST)
927 p.prefixlen = IPV4_MAX_PREFIXLEN;
928 else
929 p.prefixlen = ip_masklen(mask.sin.sin_addr);
930
931 /* Catch self originated messages and match them against our
932 * current RIB.
933 * At the same time, ignore unconfirmed messages, they should be
934 * tracked
935 * by rtm_write() and kernel_rtm_ipv4().
936 */
937 if (rtm->rtm_type != RTM_GET && rtm->rtm_pid == pid) {
938 char buf[PREFIX_STRLEN], gate_buf[INET_ADDRSTRLEN];
939 int ret;
940 if (!IS_ZEBRA_DEBUG_RIB)
941 return;
942 ret = rib_lookup_ipv4_route((struct prefix_ipv4 *)&p,
943 &gate, VRF_DEFAULT);
944 prefix2str(&p, buf, sizeof(buf));
945 switch (rtm->rtm_type) {
946 case RTM_ADD:
947 case RTM_GET:
948 case RTM_CHANGE:
949 /* The kernel notifies us about a new route in
950 FIB created by us.
951 Do we have a correspondent entry in our RIB?
952 */
953 switch (ret) {
954 case ZEBRA_RIB_NOTFOUND:
955 zlog_debug(
956 "%s: %s %s: desync: RR isn't yet in RIB, while already in FIB",
957 __func__,
958 lookup_msg(rtm_type_str,
959 rtm->rtm_type, NULL),
960 buf);
961 break;
962 case ZEBRA_RIB_FOUND_CONNECTED:
963 case ZEBRA_RIB_FOUND_NOGATE:
964 inet_ntop(AF_INET, &gate.sin.sin_addr,
965 gate_buf, INET_ADDRSTRLEN);
966 zlog_debug(
967 "%s: %s %s: desync: RR is in RIB, but gate differs (ours is %s)",
968 __func__,
969 lookup_msg(rtm_type_str,
970 rtm->rtm_type, NULL),
971 buf, gate_buf);
972 break;
973 case ZEBRA_RIB_FOUND_EXACT: /* RIB RR == FIB RR
974 */
975 zlog_debug(
976 "%s: %s %s: done Ok", __func__,
977 lookup_msg(rtm_type_str,
978 rtm->rtm_type, NULL),
979 buf);
980 rib_lookup_and_dump(
981 (struct prefix_ipv4 *)&p,
982 VRF_DEFAULT);
983 return;
984 break;
985 }
986 break;
987 case RTM_DELETE:
988 /* The kernel notifies us about a route deleted
989 by us. Do we still
990 have it in the RIB? Do we have anything
991 instead? */
992 switch (ret) {
993 case ZEBRA_RIB_FOUND_EXACT:
994 zlog_debug(
995 "%s: %s %s: desync: RR is still in RIB, while already not in FIB",
996 __func__,
997 lookup_msg(rtm_type_str,
998 rtm->rtm_type, NULL),
999 buf);
1000 rib_lookup_and_dump(
1001 (struct prefix_ipv4 *)&p,
1002 VRF_DEFAULT);
1003 break;
1004 case ZEBRA_RIB_FOUND_CONNECTED:
1005 case ZEBRA_RIB_FOUND_NOGATE:
1006 zlog_debug(
1007 "%s: %s %s: desync: RR is still in RIB, plus gate differs",
1008 __func__,
1009 lookup_msg(rtm_type_str,
1010 rtm->rtm_type, NULL),
1011 buf);
1012 rib_lookup_and_dump(
1013 (struct prefix_ipv4 *)&p,
1014 VRF_DEFAULT);
1015 break;
1016 case ZEBRA_RIB_NOTFOUND: /* RIB RR == FIB RR */
1017 zlog_debug(
1018 "%s: %s %s: done Ok", __func__,
1019 lookup_msg(rtm_type_str,
1020 rtm->rtm_type, NULL),
1021 buf);
1022 rib_lookup_and_dump(
1023 (struct prefix_ipv4 *)&p,
1024 VRF_DEFAULT);
1025 return;
1026 break;
1027 }
1028 break;
1029 default:
1030 zlog_debug(
1031 "%s: %s: warning: loopback RTM of type %s received",
1032 __func__, buf,
1033 lookup_msg(rtm_type_str, rtm->rtm_type,
1034 NULL));
1035 }
1036 return;
1037 }
1038
1039 /* Change, delete the old prefix, we have no further information
1040 * to specify the route really
1041 */
1042 if (rtm->rtm_type == RTM_CHANGE)
1043 rib_delete(AFI_IP, SAFI_UNICAST, VRF_DEFAULT,
1044 ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
1045 NULL, 0, 0, true, NULL);
1046
1047 if (!nh.type) {
1048 nh.type = NEXTHOP_TYPE_IPV4;
1049 nh.gate.ipv4 = gate.sin.sin_addr;
1050 }
1051
1052 if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD
1053 || rtm->rtm_type == RTM_CHANGE)
1054 rib_add(AFI_IP, SAFI_UNICAST, VRF_DEFAULT,
1055 ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
1056 &nh, 0, 0, 0, 0, 0);
1057 else
1058 rib_delete(AFI_IP, SAFI_UNICAST, VRF_DEFAULT,
1059 ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
1060 &nh, 0, 0, true, NULL);
1061 }
1062 if (dest.sa.sa_family == AF_INET6) {
1063 /* One day we might have a debug section here like one in the
1064 * IPv4 case above. Just ignore own messages at the moment.
1065 */
1066 if (rtm->rtm_type != RTM_GET && rtm->rtm_pid == pid)
1067 return;
1068 struct prefix p;
1069 ifindex_t ifindex = 0;
1070
1071 p.family = AF_INET6;
1072 p.u.prefix6 = dest.sin6.sin6_addr;
1073 if (flags & RTF_HOST)
1074 p.prefixlen = IPV6_MAX_PREFIXLEN;
1075 else
1076 p.prefixlen = ip6_masklen(mask.sin6.sin6_addr);
1077
1078 #ifdef KAME
1079 if (IN6_IS_ADDR_LINKLOCAL(&gate.sin6.sin6_addr)) {
1080 ifindex = IN6_LINKLOCAL_IFINDEX(gate.sin6.sin6_addr);
1081 SET_IN6_LINKLOCAL_IFINDEX(gate.sin6.sin6_addr, 0);
1082 }
1083 #endif /* KAME */
1084
1085 /* CHANGE: delete the old prefix, we have no further information
1086 * to specify the route really
1087 */
1088 if (rtm->rtm_type == RTM_CHANGE)
1089 rib_delete(AFI_IP6, SAFI_UNICAST, VRF_DEFAULT,
1090 ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
1091 NULL, 0, 0, true, NULL);
1092
1093 if (!nh.type) {
1094 nh.type = ifindex ? NEXTHOP_TYPE_IPV6_IFINDEX
1095 : NEXTHOP_TYPE_IPV6;
1096 nh.gate.ipv6 = gate.sin6.sin6_addr;
1097 nh.ifindex = ifindex;
1098 }
1099
1100 if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD
1101 || rtm->rtm_type == RTM_CHANGE)
1102 rib_add(AFI_IP6, SAFI_UNICAST, VRF_DEFAULT,
1103 ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
1104 &nh, 0, 0, 0, 0, 0);
1105 else
1106 rib_delete(AFI_IP6, SAFI_UNICAST, VRF_DEFAULT,
1107 ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
1108 &nh, 0, 0, true, NULL);
1109 }
1110 }
1111
1112 /* Interface function for the kernel routing table updates. Support
1113 * for RTM_CHANGE will be needed.
1114 * Exported only for rt_socket.c
1115 */
1116 int rtm_write(int message, union sockunion *dest, union sockunion *mask,
1117 union sockunion *gate, union sockunion *mpls, unsigned int index,
1118 enum blackhole_type bh_type, int metric)
1119 {
1120 int ret;
1121 caddr_t pnt;
1122 struct interface *ifp;
1123
1124 /* Sequencial number of routing message. */
1125 static int msg_seq = 0;
1126
1127 /* Struct of rt_msghdr and buffer for storing socket's data. */
1128 struct {
1129 struct rt_msghdr rtm;
1130 char buf[512];
1131 } msg;
1132
1133 if (routing_sock < 0)
1134 return ZEBRA_ERR_EPERM;
1135
1136 /* Clear and set rt_msghdr values */
1137 memset(&msg, 0, sizeof(struct rt_msghdr));
1138 msg.rtm.rtm_version = RTM_VERSION;
1139 msg.rtm.rtm_type = message;
1140 msg.rtm.rtm_seq = msg_seq++;
1141 msg.rtm.rtm_addrs = RTA_DST;
1142 msg.rtm.rtm_addrs |= RTA_GATEWAY;
1143 msg.rtm.rtm_flags = RTF_UP;
1144 #ifdef __OpenBSD__
1145 msg.rtm.rtm_flags |= RTF_MPATH;
1146 msg.rtm.rtm_fmask = RTF_MPLS;
1147 #endif
1148 msg.rtm.rtm_index = index;
1149
1150 if (metric != 0) {
1151 msg.rtm.rtm_rmx.rmx_hopcount = metric;
1152 msg.rtm.rtm_inits |= RTV_HOPCOUNT;
1153 }
1154
1155 ifp = if_lookup_by_index(index, VRF_DEFAULT);
1156
1157 if (gate && (message == RTM_ADD || message == RTM_CHANGE))
1158 msg.rtm.rtm_flags |= RTF_GATEWAY;
1159
1160 /* When RTF_CLONING is unavailable on BSD, should we set some
1161 * other flag instead?
1162 */
1163 #ifdef RTF_CLONING
1164 if (!gate && (message == RTM_ADD || message == RTM_CHANGE) && ifp
1165 && (ifp->flags & IFF_POINTOPOINT) == 0)
1166 msg.rtm.rtm_flags |= RTF_CLONING;
1167 #endif /* RTF_CLONING */
1168
1169 /* If no protocol specific gateway is specified, use link
1170 address for gateway. */
1171 if (!gate) {
1172 if (!ifp) {
1173 char dest_buf[INET_ADDRSTRLEN] = "NULL",
1174 mask_buf[INET_ADDRSTRLEN] = "255.255.255.255";
1175 if (dest)
1176 inet_ntop(AF_INET, &dest->sin.sin_addr,
1177 dest_buf, INET_ADDRSTRLEN);
1178 if (mask)
1179 inet_ntop(AF_INET, &mask->sin.sin_addr,
1180 mask_buf, INET_ADDRSTRLEN);
1181 zlog_warn(
1182 "%s: %s/%s: gate == NULL and no gateway found for ifindex %d",
1183 __func__, dest_buf, mask_buf, index);
1184 return -1;
1185 }
1186 gate = (union sockunion *)&((struct zebra_if *)ifp->info)->sdl;
1187 }
1188
1189 if (mask)
1190 msg.rtm.rtm_addrs |= RTA_NETMASK;
1191 else if (message == RTM_ADD || message == RTM_CHANGE)
1192 msg.rtm.rtm_flags |= RTF_HOST;
1193
1194 #ifdef __OpenBSD__
1195 if (mpls) {
1196 msg.rtm.rtm_addrs |= RTA_SRC;
1197 msg.rtm.rtm_flags |= RTF_MPLS;
1198
1199 if (mpls->smpls.smpls_label
1200 != htonl(MPLS_LABEL_IMPLICIT_NULL << MPLS_LABEL_OFFSET))
1201 msg.rtm.rtm_mpls = MPLS_OP_PUSH;
1202 }
1203 #endif
1204
1205 /* Tagging route with flags */
1206 msg.rtm.rtm_flags |= (RTF_PROTO1);
1207
1208 switch (bh_type) {
1209 case BLACKHOLE_UNSPEC:
1210 break;
1211 case BLACKHOLE_REJECT:
1212 msg.rtm.rtm_flags |= RTF_REJECT;
1213 break;
1214 default:
1215 msg.rtm.rtm_flags |= RTF_BLACKHOLE;
1216 break;
1217 }
1218
1219
1220 #define SOCKADDRSET(X, R) \
1221 if (msg.rtm.rtm_addrs & (R)) { \
1222 int len = SAROUNDUP(X); \
1223 memcpy(pnt, (caddr_t)(X), len); \
1224 pnt += len; \
1225 }
1226
1227 pnt = (caddr_t)msg.buf;
1228
1229 /* Write each socket data into rtm message buffer */
1230 SOCKADDRSET(dest, RTA_DST);
1231 SOCKADDRSET(gate, RTA_GATEWAY);
1232 SOCKADDRSET(mask, RTA_NETMASK);
1233 #ifdef __OpenBSD__
1234 SOCKADDRSET(mpls, RTA_SRC);
1235 #endif
1236
1237 msg.rtm.rtm_msglen = pnt - (caddr_t)&msg;
1238
1239 ret = write(routing_sock, &msg, msg.rtm.rtm_msglen);
1240
1241 if (ret != msg.rtm.rtm_msglen) {
1242 if (errno == EEXIST)
1243 return ZEBRA_ERR_RTEXIST;
1244 if (errno == ENETUNREACH)
1245 return ZEBRA_ERR_RTUNREACH;
1246 if (errno == ESRCH)
1247 return ZEBRA_ERR_RTNOEXIST;
1248
1249 zlog_warn("%s: write : %s (%d)", __func__, safe_strerror(errno),
1250 errno);
1251 return ZEBRA_ERR_KERNEL;
1252 }
1253 return ZEBRA_ERR_NOERROR;
1254 }
1255
1256
1257 #include "thread.h"
1258 #include "zebra/zserv.h"
1259
1260 /* For debug purpose. */
1261 static void rtmsg_debug(struct rt_msghdr *rtm)
1262 {
1263 zlog_debug("Kernel: Len: %d Type: %s", rtm->rtm_msglen,
1264 lookup_msg(rtm_type_str, rtm->rtm_type, NULL));
1265 rtm_flag_dump(rtm->rtm_flags);
1266 zlog_debug("Kernel: message seq %d", rtm->rtm_seq);
1267 zlog_debug("Kernel: pid %lld, rtm_addrs 0x%x", (long long)rtm->rtm_pid,
1268 rtm->rtm_addrs);
1269 }
1270
1271 /* This is pretty gross, better suggestions welcome -- mhandler */
1272 #ifndef RTAX_MAX
1273 #ifdef RTA_NUMBITS
1274 #define RTAX_MAX RTA_NUMBITS
1275 #else
1276 #define RTAX_MAX 8
1277 #endif /* RTA_NUMBITS */
1278 #endif /* RTAX_MAX */
1279
1280 /* Kernel routing table and interface updates via routing socket. */
1281 static int kernel_read(struct thread *thread)
1282 {
1283 int sock;
1284 int nbytes;
1285 struct rt_msghdr *rtm;
1286
1287 /*
1288 * This must be big enough for any message the kernel might send.
1289 * Rather than determining how many sockaddrs of what size might be
1290 * in each particular message, just use RTAX_MAX of sockaddr_storage
1291 * for each. Note that the sockaddrs must be after each message
1292 * definition, or rather after whichever happens to be the largest,
1293 * since the buffer needs to be big enough for a message and the
1294 * sockaddrs together.
1295 */
1296 union {
1297 /* Routing information. */
1298 struct {
1299 struct rt_msghdr rtm;
1300 struct sockaddr_storage addr[RTAX_MAX];
1301 } r;
1302
1303 /* Interface information. */
1304 struct {
1305 struct if_msghdr ifm;
1306 struct sockaddr_storage addr[RTAX_MAX];
1307 } im;
1308
1309 /* Interface address information. */
1310 struct {
1311 struct ifa_msghdr ifa;
1312 struct sockaddr_storage addr[RTAX_MAX];
1313 } ia;
1314
1315 #ifdef RTM_IFANNOUNCE
1316 /* Interface arrival/departure */
1317 struct {
1318 struct if_announcemsghdr ifan;
1319 struct sockaddr_storage addr[RTAX_MAX];
1320 } ian;
1321 #endif /* RTM_IFANNOUNCE */
1322
1323 } buf;
1324
1325 /* Fetch routing socket. */
1326 sock = THREAD_FD(thread);
1327
1328 nbytes = read(sock, &buf, sizeof buf);
1329
1330 if (nbytes <= 0) {
1331 if (nbytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN)
1332 zlog_warn("routing socket error: %s",
1333 safe_strerror(errno));
1334 return 0;
1335 }
1336
1337 thread_add_read(zebrad.master, kernel_read, NULL, sock, NULL);
1338
1339 if (IS_ZEBRA_DEBUG_KERNEL)
1340 rtmsg_debug(&buf.r.rtm);
1341
1342 rtm = &buf.r.rtm;
1343
1344 /*
1345 * Ensure that we didn't drop any data, so that processing routines
1346 * can assume they have the whole message.
1347 */
1348 if (rtm->rtm_msglen != nbytes) {
1349 zlog_warn(
1350 "kernel_read: rtm->rtm_msglen %d, nbytes %d, type %d\n",
1351 rtm->rtm_msglen, nbytes, rtm->rtm_type);
1352 return -1;
1353 }
1354
1355 switch (rtm->rtm_type) {
1356 case RTM_ADD:
1357 case RTM_DELETE:
1358 case RTM_CHANGE:
1359 rtm_read(rtm);
1360 break;
1361 case RTM_IFINFO:
1362 ifm_read(&buf.im.ifm);
1363 break;
1364 case RTM_NEWADDR:
1365 case RTM_DELADDR:
1366 ifam_read(&buf.ia.ifa);
1367 break;
1368 #ifdef RTM_IFANNOUNCE
1369 case RTM_IFANNOUNCE:
1370 ifan_read(&buf.ian.ifan);
1371 break;
1372 #endif /* RTM_IFANNOUNCE */
1373 default:
1374 if (IS_ZEBRA_DEBUG_KERNEL)
1375 zlog_debug("Unprocessed RTM_type: %d", rtm->rtm_type);
1376 break;
1377 }
1378 return 0;
1379 }
1380
1381 /* Make routing socket. */
1382 static void routing_socket(struct zebra_ns *zns)
1383 {
1384 if (zserv_privs.change(ZPRIVS_RAISE))
1385 zlog_err("routing_socket: Can't raise privileges");
1386
1387 routing_sock =
1388 ns_socket(AF_ROUTE, SOCK_RAW, 0, (ns_id_t)zns->ns->ns_id);
1389
1390 if (routing_sock < 0) {
1391 if (zserv_privs.change(ZPRIVS_LOWER))
1392 zlog_err("routing_socket: Can't lower privileges");
1393 zlog_warn("Can't init kernel routing socket");
1394 return;
1395 }
1396
1397 /* XXX: Socket should be NONBLOCK, however as we currently
1398 * discard failed writes, this will lead to inconsistencies.
1399 * For now, socket must be blocking.
1400 */
1401 /*if (fcntl (routing_sock, F_SETFL, O_NONBLOCK) < 0)
1402 zlog_warn ("Can't set O_NONBLOCK to routing socket");*/
1403
1404 if (zserv_privs.change(ZPRIVS_LOWER))
1405 zlog_err("routing_socket: Can't lower privileges");
1406
1407 /* kernel_read needs rewrite. */
1408 thread_add_read(zebrad.master, kernel_read, NULL, routing_sock, NULL);
1409 }
1410
1411 /* Exported interface function. This function simply calls
1412 routing_socket (). */
1413 void kernel_init(struct zebra_ns *zns)
1414 {
1415 routing_socket(zns);
1416 }
1417
1418 void kernel_terminate(struct zebra_ns *zns)
1419 {
1420 return;
1421 }
1422
1423 #endif /* !HAVE_NETLINK */
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