1 /* Kernel communication using routing socket.
2 * Copyright (C) 1999 Kunihiro Ishiguro
4 * This file is part of GNU Zebra.
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
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.
16 * You should have received a copy of the GNU General Public License
17 * along with GNU Zebra; see the file COPYING. If not, write to the Free
18 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
26 #include "sockunion.h"
27 #include "connected.h"
36 #include "zebra/interface.h"
37 #include "zebra/zserv.h"
38 #include "zebra/debug.h"
39 #include "zebra/kernel_socket.h"
41 extern struct zebra_privs_t zserv_privs
;
42 extern struct zebra_t zebrad
;
45 * Given a sockaddr length, round it up to include pad bytes following
46 * it. Assumes the kernel pads to sizeof(long).
48 * XXX: why is ROUNDUP(0) sizeof(long)? 0 is an illegal sockaddr
49 * length anyway (< sizeof (struct sockaddr)), so this shouldn't
53 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
56 * Given a pointer (sockaddr or void *), return the number of bytes
57 * taken up by the sockaddr and any padding needed for alignment.
59 #if defined(HAVE_SA_LEN)
60 #define SAROUNDUP(X) ROUNDUP(((struct sockaddr *)(X))->sa_len)
61 #elif defined(HAVE_IPV6)
63 * One would hope all fixed-size structure definitions are aligned,
64 * but round them up nonetheless.
66 #define SAROUNDUP(X) \
67 (((struct sockaddr *)(X))->sa_family == AF_INET ? \
68 ROUNDUP(sizeof(struct sockaddr_in)):\
69 (((struct sockaddr *)(X))->sa_family == AF_INET6 ? \
70 ROUNDUP(sizeof(struct sockaddr_in6)) : \
71 (((struct sockaddr *)(X))->sa_family == AF_LINK ? \
72 ROUNDUP(sizeof(struct sockaddr_dl)) : sizeof(struct sockaddr))))
74 #define SAROUNDUP(X) \
75 (((struct sockaddr *)(X))->sa_family == AF_INET ? \
76 ROUNDUP(sizeof(struct sockaddr_in)):\
77 (((struct sockaddr *)(X))->sa_family == AF_LINK ? \
78 ROUNDUP(sizeof(struct sockaddr_dl)) : sizeof(struct sockaddr)))
79 #endif /* HAVE_SA_LEN */
81 /* We use an additional pointer in following, pdest, rather than (DEST)
82 * directly, because gcc will warn if the macro is expanded and DEST is NULL,
83 * complaining that memcpy is being passed a NULL value, despite the fact
84 * the if (NULL) makes it impossible.
86 #define RTA_ADDR_GET(DEST, RTA, RTMADDRS, PNT) \
87 if ((RTMADDRS) & (RTA)) \
89 void *pdest = (DEST); \
90 int len = SAROUNDUP ((PNT)); \
91 if ( ((DEST) != NULL) && \
92 af_check (((struct sockaddr *)(PNT))->sa_family)) \
93 memcpy (pdest, (PNT), len); \
96 #define RTA_ATTR_GET(DEST, RTA, RTMADDRS, PNT) \
97 if ((RTMADDRS) & (RTA)) \
99 void *pdest = (DEST); \
100 int len = SAROUNDUP ((PNT)); \
101 if ((DEST) != NULL) \
102 memcpy (pdest, (PNT), len); \
106 #define RTA_NAME_GET(DEST, RTA, RTMADDRS, PNT, LEN) \
107 if ((RTMADDRS) & (RTA)) \
109 u_char *pdest = (u_char *) (DEST); \
110 int len = SAROUNDUP ((PNT)); \
111 struct sockaddr_dl *sdl = (struct sockaddr_dl *)(PNT); \
112 if (IS_ZEBRA_DEBUG_KERNEL) \
113 zlog_debug ("%s: RTA_SDL_GET nlen %d, alen %d", \
114 __func__, sdl->sdl_nlen, sdl->sdl_alen); \
115 if ( ((DEST) != NULL) && (sdl->sdl_family == AF_LINK) \
116 && (sdl->sdl_nlen < IFNAMSIZ) && (sdl->sdl_nlen <= len) ) \
118 memcpy (pdest, sdl->sdl_data, sdl->sdl_nlen); \
119 pdest[sdl->sdl_nlen] = '\0'; \
120 (LEN) = sdl->sdl_nlen; \
128 /* Routing socket message types. */
129 struct message rtm_type_str
[] =
131 {RTM_ADD
, "RTM_ADD"},
132 {RTM_DELETE
, "RTM_DELETE"},
133 {RTM_CHANGE
, "RTM_CHANGE"},
134 {RTM_GET
, "RTM_GET"},
135 {RTM_LOSING
, "RTM_LOSING"},
136 {RTM_REDIRECT
, "RTM_REDIRECT"},
137 {RTM_MISS
, "RTM_MISS"},
138 {RTM_LOCK
, "RTM_LOCK"},
139 {RTM_OLDADD
, "RTM_OLDADD"},
140 {RTM_OLDDEL
, "RTM_OLDDEL"},
141 {RTM_RESOLVE
, "RTM_RESOLVE"},
142 {RTM_NEWADDR
, "RTM_NEWADDR"},
143 {RTM_DELADDR
, "RTM_DELADDR"},
144 {RTM_IFINFO
, "RTM_IFINFO"},
146 {RTM_OIFINFO
, "RTM_OIFINFO"},
147 #endif /* RTM_OIFINFO */
149 {RTM_NEWMADDR
, "RTM_NEWMADDR"},
150 #endif /* RTM_NEWMADDR */
152 {RTM_DELMADDR
, "RTM_DELMADDR"},
153 #endif /* RTM_DELMADDR */
154 #ifdef RTM_IFANNOUNCE
155 {RTM_IFANNOUNCE
, "RTM_IFANNOUNCE"},
156 #endif /* RTM_IFANNOUNCE */
160 struct message rtm_flag_str
[] =
163 {RTF_GATEWAY
, "GATEWAY"},
165 {RTF_REJECT
, "REJECT"},
166 {RTF_DYNAMIC
, "DYNAMIC"},
167 {RTF_MODIFIED
, "MODIFIED"},
171 #endif /* RTF_MASK */
172 {RTF_CLONING
, "CLONING"},
173 {RTF_XRESOLVE
, "XRESOLVE"},
174 {RTF_LLINFO
, "LLINFO"},
175 {RTF_STATIC
, "STATIC"},
176 {RTF_BLACKHOLE
, "BLACKHOLE"},
178 {RTF_PRIVATE
, "PRIVATE"},
179 #endif /* RTF_PRIVATE */
180 {RTF_PROTO1
, "PROTO1"},
181 {RTF_PROTO2
, "PROTO2"},
183 {RTF_PRCLONING
, "PRCLONING"},
184 #endif /* RTF_PRCLONING */
186 {RTF_WASCLONED
, "WASCLONED"},
187 #endif /* RTF_WASCLONED */
189 {RTF_PROTO3
, "PROTO3"},
190 #endif /* RTF_PROTO3 */
192 {RTF_PINNED
, "PINNED"},
193 #endif /* RTF_PINNED */
195 {RTF_LOCAL
, "LOCAL"},
196 #endif /* RTF_LOCAL */
198 {RTF_BROADCAST
, "BROADCAST"},
199 #endif /* RTF_BROADCAST */
201 {RTF_MULTICAST
, "MULTICAST"},
202 #endif /* RTF_MULTICAST */
204 {RTF_MULTIRT
, "MULTIRT"},
205 #endif /* RTF_MULTIRT */
207 {RTF_SETSRC
, "SETSRC"},
208 #endif /* RTF_SETSRC */
212 /* Kernel routing update socket. */
213 int routing_sock
= -1;
215 /* Yes I'm checking ugly routing socket behavior. */
218 /* Supported address family check. */
220 af_check (int family
)
222 if (family
== AF_INET
)
225 if (family
== AF_INET6
)
227 #endif /* HAVE_IPV6 */
231 /* Dump routing table flag for debug purpose. */
233 rtm_flag_dump (int flag
)
236 static char buf
[BUFSIZ
];
239 for (mes
= rtm_flag_str
; mes
->key
!= 0; mes
++)
243 strlcat (buf
, mes
->str
, BUFSIZ
);
244 strlcat (buf
, " ", BUFSIZ
);
247 zlog_debug ("Kernel: %s", buf
);
250 #ifdef RTM_IFANNOUNCE
251 /* Interface adding function */
253 ifan_read (struct if_announcemsghdr
*ifan
)
255 struct interface
*ifp
;
257 ifp
= if_lookup_by_index (ifan
->ifan_index
);
260 assert ( (ifp
->ifindex
== ifan
->ifan_index
)
261 || (ifp
->ifindex
== IFINDEX_INTERNAL
) );
264 || ((ifp
->ifindex
== IFINDEX_INTERNAL
)
265 && (ifan
->ifan_what
== IFAN_ARRIVAL
)) )
267 if (IS_ZEBRA_DEBUG_KERNEL
)
268 zlog_debug ("%s: creating interface for ifindex %d, name %s",
269 __func__
, ifan
->ifan_index
, ifan
->ifan_name
);
271 /* Create Interface */
272 ifp
= if_get_by_name_len(ifan
->ifan_name
,
273 strnlen(ifan
->ifan_name
,
274 sizeof(ifan
->ifan_name
)));
275 ifp
->ifindex
= ifan
->ifan_index
;
279 else if (ifp
!= NULL
&& ifan
->ifan_what
== IFAN_DEPARTURE
)
280 if_delete_update (ifp
);
286 if (IS_ZEBRA_DEBUG_KERNEL
)
287 zlog_debug ("%s: interface %s index %d",
288 __func__
, ifan
->ifan_name
, ifan
->ifan_index
);
292 #endif /* RTM_IFANNOUNCE */
295 * Handle struct if_msghdr obtained from reading routing socket or
296 * sysctl (from interface_list). There may or may not be sockaddrs
297 * present after the header.
300 ifm_read (struct if_msghdr
*ifm
)
302 struct interface
*ifp
= NULL
;
303 char ifname
[IFNAMSIZ
];
307 /* terminate ifname at head (for strnlen) and tail (for safety) */
308 ifname
[IFNAMSIZ
- 1] = '\0';
310 /* paranoia: sanity check structure */
311 if (ifm
->ifm_msglen
< sizeof(struct if_msghdr
))
313 zlog_err ("ifm_read: ifm->ifm_msglen %d too short\n",
319 * Check for a sockaddr_dl following the message. First, point to
320 * where a socakddr might be if one follows the message.
322 cp
= (void *)(ifm
+ 1);
326 * XXX This behavior should be narrowed to only the kernel versions
327 * for which the structures returned do not match the headers.
329 * if_msghdr_t on 64 bit kernels in Solaris 9 and earlier versions
330 * is 12 bytes larger than the 32 bit version.
332 if (((struct sockaddr
*) cp
)->sa_family
== AF_UNSPEC
)
336 RTA_ADDR_GET (NULL
, RTA_DST
, ifm
->ifm_addrs
, cp
);
337 RTA_ADDR_GET (NULL
, RTA_GATEWAY
, ifm
->ifm_addrs
, cp
);
338 RTA_ATTR_GET (NULL
, RTA_NETMASK
, ifm
->ifm_addrs
, cp
);
339 RTA_ADDR_GET (NULL
, RTA_GENMASK
, ifm
->ifm_addrs
, cp
);
340 RTA_NAME_GET (ifname
, RTA_IFP
, ifm
->ifm_addrs
, cp
, ifnlen
);
341 RTA_ADDR_GET (NULL
, RTA_IFA
, ifm
->ifm_addrs
, cp
);
342 RTA_ADDR_GET (NULL
, RTA_AUTHOR
, ifm
->ifm_addrs
, cp
);
343 RTA_ADDR_GET (NULL
, RTA_BRD
, ifm
->ifm_addrs
, cp
);
345 if (IS_ZEBRA_DEBUG_KERNEL
)
346 zlog_debug ("%s: sdl ifname %s", __func__
, (ifnlen
? ifname
: "(nil)"));
349 * Look up on ifindex first, because ifindices are the primary handle for
350 * interfaces across the user/kernel boundary, for most systems. (Some
351 * messages, such as up/down status changes on NetBSD, do not include a
354 if ( (ifp
= if_lookup_by_index (ifm
->ifm_index
)) != NULL
)
356 /* we have an ifp, verify that the name matches as some systems,
357 * eg Solaris, have a 1:many association of ifindex:ifname
358 * if they dont match, we dont have the correct ifp and should
359 * set it back to NULL to let next check do lookup by name
361 if (ifnlen
&& (strncmp (ifp
->name
, ifname
, IFNAMSIZ
) != 0) )
363 if (IS_ZEBRA_DEBUG_KERNEL
)
364 zlog_debug ("%s: ifp name %s doesnt match sdl name %s",
365 __func__
, ifp
->name
, ifname
);
371 * If we dont have an ifp, try looking up by name. Particularly as some
372 * systems (Solaris) have a 1:many mapping of ifindex:ifname - the ifname
373 * is therefore our unique handle to that interface.
375 * Interfaces specified in the configuration file for which the ifindex
376 * has not been determined will have ifindex == IFINDEX_INTERNAL, and such
377 * interfaces are found by this search, and then their ifindex values can
380 if ( (ifp
== NULL
) && ifnlen
)
381 ifp
= if_lookup_by_name (ifname
);
384 * If ifp still does not exist or has an invalid index (IFINDEX_INTERNAL),
385 * create or fill in an interface.
387 if ((ifp
== NULL
) || (ifp
->ifindex
== IFINDEX_INTERNAL
))
390 * To create or fill in an interface, a sockaddr_dl (via
391 * RTA_IFP) is required.
395 zlog_warn ("Interface index %d (new) missing ifname\n",
400 #ifndef RTM_IFANNOUNCE
401 /* Down->Down interface should be ignored here.
402 * See further comment below.
404 if (!CHECK_FLAG (ifm
->ifm_flags
, IFF_UP
))
406 #endif /* !RTM_IFANNOUNCE */
410 /* Interface that zebra was not previously aware of, so create. */
411 ifp
= if_create (ifname
, ifnlen
);
412 if (IS_ZEBRA_DEBUG_KERNEL
)
413 zlog_debug ("%s: creating ifp for ifindex %d",
414 __func__
, ifm
->ifm_index
);
417 if (IS_ZEBRA_DEBUG_KERNEL
)
418 zlog_debug ("%s: updated/created ifp, ifname %s, ifindex %d",
419 __func__
, ifp
->name
, ifp
->ifindex
);
421 * Fill in newly created interface structure, or larval
422 * structure with ifindex IFINDEX_INTERNAL.
424 ifp
->ifindex
= ifm
->ifm_index
;
425 if_flags_update (ifp
, ifm
->ifm_flags
);
426 #if defined(__bsdi__)
427 if_kvm_get_mtu (ifp
);
430 #endif /* __bsdi__ */
437 * Interface structure exists. Adjust stored flags from
438 * notification. If interface has up->down or down->up
439 * transition, call state change routines (to adjust routes,
440 * notify routing daemons, etc.). (Other flag changes are stored
441 * but apparently do not trigger action.)
444 if (ifp
->ifindex
!= ifm
->ifm_index
)
446 zlog_warn ("%s: index mismatch, ifname %s, ifp index %d, "
448 __func__
, ifp
->name
, ifp
->ifindex
, ifm
->ifm_index
);
452 /* update flags and handle operative->inoperative transition, if any */
453 if_flags_update (ifp
, ifm
->ifm_flags
);
455 #ifndef RTM_IFANNOUNCE
458 /* No RTM_IFANNOUNCE on this platform, so we can never
459 * distinguish between ~IFF_UP and delete. We must presume
460 * it has been deleted.
461 * Eg, Solaris will not notify us of unplumb.
463 * XXX: Fixme - this should be runtime detected
464 * So that a binary compiled on a system with IFANNOUNCE
465 * will still behave correctly if run on a platform without
467 if_delete_update (ifp
);
469 #endif /* RTM_IFANNOUNCE */
472 #ifdef HAVE_NET_RT_IFLIST
473 ifp
->stats
= ifm
->ifm_data
;
474 #endif /* HAVE_NET_RT_IFLIST */
476 if (IS_ZEBRA_DEBUG_KERNEL
)
477 zlog_debug ("%s: interface %s index %d",
478 __func__
, ifp
->name
, ifp
->ifindex
);
483 /* Address read from struct ifa_msghdr. */
485 ifam_read_mesg (struct ifa_msghdr
*ifm
,
486 union sockunion
*addr
,
487 union sockunion
*mask
,
488 union sockunion
*brd
,
494 pnt
= (caddr_t
)(ifm
+ 1);
495 end
= ((caddr_t
)ifm
) + ifm
->ifam_msglen
;
497 /* Be sure structure is cleared */
498 memset (mask
, 0, sizeof (union sockunion
));
499 memset (addr
, 0, sizeof (union sockunion
));
500 memset (brd
, 0, sizeof (union sockunion
));
502 /* We fetch each socket variable into sockunion. */
503 RTA_ADDR_GET (NULL
, RTA_DST
, ifm
->ifam_addrs
, pnt
);
504 RTA_ADDR_GET (NULL
, RTA_GATEWAY
, ifm
->ifam_addrs
, pnt
);
505 RTA_ATTR_GET (mask
, RTA_NETMASK
, ifm
->ifam_addrs
, pnt
);
506 RTA_ADDR_GET (NULL
, RTA_GENMASK
, ifm
->ifam_addrs
, pnt
);
507 RTA_NAME_GET (ifname
, RTA_IFP
, ifm
->ifam_addrs
, pnt
, *ifnlen
);
508 RTA_ADDR_GET (addr
, RTA_IFA
, ifm
->ifam_addrs
, pnt
);
509 RTA_ADDR_GET (NULL
, RTA_AUTHOR
, ifm
->ifam_addrs
, pnt
);
510 RTA_ADDR_GET (brd
, RTA_BRD
, ifm
->ifam_addrs
, pnt
);
512 if (IS_ZEBRA_DEBUG_KERNEL
)
514 switch (sockunion_family(addr
))
518 char buf
[2][INET_ADDRSTRLEN
];
519 zlog_debug ("%s: ifindex %d, ifname %s, ifam_addrs 0x%x, "
520 "addr %s/%d broad %s",
521 __func__
, ifm
->ifam_index
,
522 (ifnlen
? ifname
: "(nil)"), ifm
->ifam_addrs
,
523 inet_ntop(AF_INET
,&addr
->sin
.sin_addr
,
524 buf
[0],sizeof(buf
[0])),
525 ip_masklen(mask
->sin
.sin_addr
),
526 inet_ntop(AF_INET
,&brd
->sin
.sin_addr
,
527 buf
[1],sizeof(buf
[1])));
533 char buf
[2][INET6_ADDRSTRLEN
];
534 zlog_debug ("%s: ifindex %d, ifname %s, ifam_addrs 0x%x, "
535 "addr %s/%d broad %s",
536 __func__
, ifm
->ifam_index
,
537 (ifnlen
? ifname
: "(nil)"), ifm
->ifam_addrs
,
538 inet_ntop(AF_INET6
,&addr
->sin6
.sin6_addr
,
539 buf
[0],sizeof(buf
[0])),
540 ip6_masklen(mask
->sin6
.sin6_addr
),
541 inet_ntop(AF_INET6
,&brd
->sin6
.sin6_addr
,
542 buf
[1],sizeof(buf
[1])));
545 #endif /* HAVE_IPV6 */
547 zlog_debug ("%s: ifindex %d, ifname %s, ifam_addrs 0x%x",
548 __func__
, ifm
->ifam_index
,
549 (ifnlen
? ifname
: "(nil)"), ifm
->ifam_addrs
);
554 /* Assert read up end point matches to end point */
556 zlog_warn ("ifam_read() does't read all socket data");
559 /* Interface's address information get. */
561 ifam_read (struct ifa_msghdr
*ifam
)
563 struct interface
*ifp
= NULL
;
564 union sockunion addr
, mask
, brd
;
565 char ifname
[INTERFACE_NAMSIZ
];
569 ifname
[0] = ifname
[INTERFACE_NAMSIZ
- 1] = '\0';
571 /* Allocate and read address information. */
572 ifam_read_mesg (ifam
, &addr
, &mask
, &brd
, ifname
, &ifnlen
);
574 if ((ifp
= if_lookup_by_index(ifam
->ifam_index
)) == NULL
)
576 zlog_warn ("%s: no interface for ifname %s, index %d",
577 __func__
, ifname
, ifam
->ifam_index
);
581 if (ifnlen
&& strncmp (ifp
->name
, ifname
, INTERFACE_NAMSIZ
))
584 ifp
->metric
= ifam
->ifam_metric
;
586 /* Add connected address. */
587 switch (sockunion_family (&addr
))
590 if (ifam
->ifam_type
== RTM_NEWADDR
)
591 connected_add_ipv4 (ifp
, 0, &addr
.sin
.sin_addr
,
592 ip_masklen (mask
.sin
.sin_addr
),
594 (isalias
? ifname
: NULL
));
596 connected_delete_ipv4 (ifp
, 0, &addr
.sin
.sin_addr
,
597 ip_masklen (mask
.sin
.sin_addr
),
602 /* Unset interface index from link-local address when IPv6 stack
604 if (IN6_IS_ADDR_LINKLOCAL (&addr
.sin6
.sin6_addr
))
605 SET_IN6_LINKLOCAL_IFINDEX (addr
.sin6
.sin6_addr
, 0);
607 if (ifam
->ifam_type
== RTM_NEWADDR
)
608 connected_add_ipv6 (ifp
,
609 &addr
.sin6
.sin6_addr
,
610 ip6_masklen (mask
.sin6
.sin6_addr
),
612 (isalias
? ifname
: NULL
));
614 connected_delete_ipv6 (ifp
,
615 &addr
.sin6
.sin6_addr
,
616 ip6_masklen (mask
.sin6
.sin6_addr
),
617 &brd
.sin6
.sin6_addr
);
619 #endif /* HAVE_IPV6 */
621 /* Unsupported family silently ignore... */
625 /* Check interface flag for implicit up of the interface. */
629 /* In addition to lacking IFANNOUNCE, on SUNOS IFF_UP is strange.
630 * See comments for SUNOS_5 in interface.c::if_flags_mangle.
632 * Here we take care of case where the real IFF_UP was previously
633 * unset (as kept in struct zebra_if.primary_state) and the mangled
634 * IFF_UP (ie IFF_UP set || listcount(connected) has now transitioned
635 * to unset due to the lost non-primary address having DELADDR'd.
637 * we must delete the interface, because in between here and next
638 * event for this interface-name the administrator could unplumb
639 * and replumb the interface.
642 if_delete_update (ifp
);
648 /* Interface function for reading kernel routing table information. */
650 rtm_read_mesg (struct rt_msghdr
*rtm
,
651 union sockunion
*dest
,
652 union sockunion
*mask
,
653 union sockunion
*gate
,
659 /* Pnt points out socket data start point. */
660 pnt
= (caddr_t
)(rtm
+ 1);
661 end
= ((caddr_t
)rtm
) + rtm
->rtm_msglen
;
663 /* rt_msghdr version check. */
664 if (rtm
->rtm_version
!= RTM_VERSION
)
665 zlog (NULL
, LOG_WARNING
,
666 "Routing message version different %d should be %d."
667 "This may cause problem\n", rtm
->rtm_version
, RTM_VERSION
);
669 /* Be sure structure is cleared */
670 memset (dest
, 0, sizeof (union sockunion
));
671 memset (gate
, 0, sizeof (union sockunion
));
672 memset (mask
, 0, sizeof (union sockunion
));
674 /* We fetch each socket variable into sockunion. */
675 RTA_ADDR_GET (dest
, RTA_DST
, rtm
->rtm_addrs
, pnt
);
676 RTA_ADDR_GET (gate
, RTA_GATEWAY
, rtm
->rtm_addrs
, pnt
);
677 RTA_ATTR_GET (mask
, RTA_NETMASK
, rtm
->rtm_addrs
, pnt
);
678 RTA_ADDR_GET (NULL
, RTA_GENMASK
, rtm
->rtm_addrs
, pnt
);
679 RTA_NAME_GET (ifname
, RTA_IFP
, rtm
->rtm_addrs
, pnt
, *ifnlen
);
680 RTA_ADDR_GET (NULL
, RTA_IFA
, rtm
->rtm_addrs
, pnt
);
681 RTA_ADDR_GET (NULL
, RTA_AUTHOR
, rtm
->rtm_addrs
, pnt
);
682 RTA_ADDR_GET (NULL
, RTA_BRD
, rtm
->rtm_addrs
, pnt
);
684 /* If there is netmask information set it's family same as
686 if (rtm
->rtm_addrs
& RTA_NETMASK
)
687 mask
->sa
.sa_family
= dest
->sa
.sa_family
;
689 /* Assert read up to the end of pointer. */
691 zlog (NULL
, LOG_WARNING
, "rtm_read() does't read all socket data.");
693 return rtm
->rtm_flags
;
697 rtm_read (struct rt_msghdr
*rtm
)
701 union sockunion dest
, mask
, gate
;
702 char ifname
[INTERFACE_NAMSIZ
+ 1];
707 /* Discard self send message. */
708 if (rtm
->rtm_type
!= RTM_GET
709 && (rtm
->rtm_pid
== pid
|| rtm
->rtm_pid
== old_pid
))
712 /* Read destination and netmask and gateway from rtm message
714 flags
= rtm_read_mesg (rtm
, &dest
, &mask
, &gate
, ifname
, &ifnlen
);
716 #ifdef RTF_CLONED /*bsdi, netbsd 1.6*/
717 if (flags
& RTF_CLONED
)
720 #ifdef RTF_WASCLONED /*freebsd*/
721 if (flags
& RTF_WASCLONED
)
725 if ((rtm
->rtm_type
== RTM_ADD
) && ! (flags
& RTF_UP
))
728 /* This is connected route. */
729 if (! (flags
& RTF_GATEWAY
))
732 if (flags
& RTF_PROTO1
)
733 SET_FLAG (zebra_flags
, ZEBRA_FLAG_SELFROUTE
);
735 /* This is persistent route. */
736 if (flags
& RTF_STATIC
)
737 SET_FLAG (zebra_flags
, ZEBRA_FLAG_STATIC
);
739 /* This is a reject or blackhole route */
740 if (flags
& RTF_REJECT
)
741 SET_FLAG (zebra_flags
, ZEBRA_FLAG_REJECT
);
742 if (flags
& RTF_BLACKHOLE
)
743 SET_FLAG (zebra_flags
, ZEBRA_FLAG_BLACKHOLE
);
745 if (dest
.sa
.sa_family
== AF_INET
)
747 struct prefix_ipv4 p
;
750 p
.prefix
= dest
.sin
.sin_addr
;
751 if (flags
& RTF_HOST
)
752 p
.prefixlen
= IPV4_MAX_PREFIXLEN
;
754 p
.prefixlen
= ip_masklen (mask
.sin
.sin_addr
);
756 /* Change, delete the old prefix, we have no further information
757 * to specify the route really
759 if (rtm
->rtm_type
== RTM_CHANGE
)
760 rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL
, zebra_flags
, &p
,
763 if (rtm
->rtm_type
== RTM_GET
764 || rtm
->rtm_type
== RTM_ADD
765 || rtm
->rtm_type
== RTM_CHANGE
)
766 rib_add_ipv4 (ZEBRA_ROUTE_KERNEL
, zebra_flags
,
767 &p
, &gate
.sin
.sin_addr
, 0, 0, 0, 0);
769 rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL
, zebra_flags
,
770 &p
, &gate
.sin
.sin_addr
, 0, 0);
773 if (dest
.sa
.sa_family
== AF_INET6
)
775 struct prefix_ipv6 p
;
776 unsigned int ifindex
= 0;
779 p
.prefix
= dest
.sin6
.sin6_addr
;
780 if (flags
& RTF_HOST
)
781 p
.prefixlen
= IPV6_MAX_PREFIXLEN
;
783 p
.prefixlen
= ip6_masklen (mask
.sin6
.sin6_addr
);
786 if (IN6_IS_ADDR_LINKLOCAL (&gate
.sin6
.sin6_addr
))
788 ifindex
= IN6_LINKLOCAL_IFINDEX (gate
.sin6
.sin6_addr
);
789 SET_IN6_LINKLOCAL_IFINDEX (gate
.sin6
.sin6_addr
, 0);
793 /* CHANGE: delete the old prefix, we have no further information
794 * to specify the route really
796 if (rtm
->rtm_type
== RTM_CHANGE
)
797 rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL
, zebra_flags
, &p
,
800 if (rtm
->rtm_type
== RTM_GET
801 || rtm
->rtm_type
== RTM_ADD
802 || rtm
->rtm_type
== RTM_CHANGE
)
803 rib_add_ipv6 (ZEBRA_ROUTE_KERNEL
, zebra_flags
,
804 &p
, &gate
.sin6
.sin6_addr
, ifindex
, 0, 0, 0);
806 rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL
, zebra_flags
,
807 &p
, &gate
.sin6
.sin6_addr
, ifindex
, 0);
809 #endif /* HAVE_IPV6 */
812 /* Interface function for the kernel routing table updates. Support
813 * for RTM_CHANGE will be needed.
814 * Exported only for rt_socket.c
817 rtm_write (int message
,
818 union sockunion
*dest
,
819 union sockunion
*mask
,
820 union sockunion
*gate
,
827 struct interface
*ifp
;
829 /* Sequencial number of routing message. */
830 static int msg_seq
= 0;
832 /* Struct of rt_msghdr and buffer for storing socket's data. */
835 struct rt_msghdr rtm
;
839 if (routing_sock
< 0)
840 return ZEBRA_ERR_EPERM
;
842 /* Clear and set rt_msghdr values */
843 memset (&msg
, 0, sizeof (struct rt_msghdr
));
844 msg
.rtm
.rtm_version
= RTM_VERSION
;
845 msg
.rtm
.rtm_type
= message
;
846 msg
.rtm
.rtm_seq
= msg_seq
++;
847 msg
.rtm
.rtm_addrs
= RTA_DST
;
848 msg
.rtm
.rtm_addrs
|= RTA_GATEWAY
;
849 msg
.rtm
.rtm_flags
= RTF_UP
;
850 msg
.rtm
.rtm_index
= index
;
854 msg
.rtm
.rtm_rmx
.rmx_hopcount
= metric
;
855 msg
.rtm
.rtm_inits
|= RTV_HOPCOUNT
;
858 ifp
= if_lookup_by_index (index
);
860 if (gate
&& message
== RTM_ADD
)
861 msg
.rtm
.rtm_flags
|= RTF_GATEWAY
;
863 if (! gate
&& message
== RTM_ADD
&& ifp
&&
864 (ifp
->flags
& IFF_POINTOPOINT
) == 0)
865 msg
.rtm
.rtm_flags
|= RTF_CLONING
;
867 /* If no protocol specific gateway is specified, use link
868 address for gateway. */
873 zlog_warn ("no gateway found for interface index %d", index
);
876 gate
= (union sockunion
*) & ifp
->sdl
;
880 msg
.rtm
.rtm_addrs
|= RTA_NETMASK
;
881 else if (message
== RTM_ADD
)
882 msg
.rtm
.rtm_flags
|= RTF_HOST
;
884 /* Tagging route with flags */
885 msg
.rtm
.rtm_flags
|= (RTF_PROTO1
);
887 /* Additional flags. */
888 if (zebra_flags
& ZEBRA_FLAG_BLACKHOLE
)
889 msg
.rtm
.rtm_flags
|= RTF_BLACKHOLE
;
890 if (zebra_flags
& ZEBRA_FLAG_REJECT
)
891 msg
.rtm
.rtm_flags
|= RTF_REJECT
;
895 #define SOCKADDRSET(X,R) \
896 if (msg.rtm.rtm_addrs & (R)) \
898 int len = ROUNDUP ((X)->sa.sa_len); \
899 memcpy (pnt, (caddr_t)(X), len); \
903 #define SOCKADDRSET(X,R) \
904 if (msg.rtm.rtm_addrs & (R)) \
906 int len = SAROUNDUP (X); \
907 memcpy (pnt, (caddr_t)(X), len); \
910 #endif /* HAVE_SIN_LEN */
912 pnt
= (caddr_t
) msg
.buf
;
914 /* Write each socket data into rtm message buffer */
915 SOCKADDRSET (dest
, RTA_DST
);
916 SOCKADDRSET (gate
, RTA_GATEWAY
);
917 SOCKADDRSET (mask
, RTA_NETMASK
);
919 msg
.rtm
.rtm_msglen
= pnt
- (caddr_t
) &msg
;
921 ret
= write (routing_sock
, &msg
, msg
.rtm
.rtm_msglen
);
923 if (ret
!= msg
.rtm
.rtm_msglen
)
926 return ZEBRA_ERR_RTEXIST
;
927 if (errno
== ENETUNREACH
)
928 return ZEBRA_ERR_RTUNREACH
;
930 zlog_warn ("write : %s (%d)", safe_strerror (errno
), errno
);
938 #include "zebra/zserv.h"
940 /* For debug purpose. */
942 rtmsg_debug (struct rt_msghdr
*rtm
)
944 const char *type
= "Unknown";
947 for (mes
= rtm_type_str
; mes
->str
; mes
++)
948 if (mes
->key
== rtm
->rtm_type
)
954 zlog_debug ("Kernel: Len: %d Type: %s", rtm
->rtm_msglen
, type
);
955 rtm_flag_dump (rtm
->rtm_flags
);
956 zlog_debug ("Kernel: message seq %d", rtm
->rtm_seq
);
957 zlog_debug ("Kernel: pid %d, rtm_addrs 0x%x", rtm
->rtm_pid
, rtm
->rtm_addrs
);
960 /* This is pretty gross, better suggestions welcome -- mhandler */
963 #define RTAX_MAX RTA_NUMBITS
966 #endif /* RTA_NUMBITS */
967 #endif /* RTAX_MAX */
969 /* Kernel routing table and interface updates via routing socket. */
971 kernel_read (struct thread
*thread
)
975 struct rt_msghdr
*rtm
;
978 * This must be big enough for any message the kernel might send.
979 * Rather than determining how many sockaddrs of what size might be
980 * in each particular message, just use RTAX_MAX of sockaddr_storage
981 * for each. Note that the sockaddrs must be after each message
982 * definition, or rather after whichever happens to be the largest,
983 * since the buffer needs to be big enough for a message and the
984 * sockaddrs together.
988 /* Routing information. */
991 struct rt_msghdr rtm
;
992 struct sockaddr_storage addr
[RTAX_MAX
];
995 /* Interface information. */
998 struct if_msghdr ifm
;
999 struct sockaddr_storage addr
[RTAX_MAX
];
1002 /* Interface address information. */
1005 struct ifa_msghdr ifa
;
1006 struct sockaddr_storage addr
[RTAX_MAX
];
1009 #ifdef RTM_IFANNOUNCE
1010 /* Interface arrival/departure */
1013 struct if_announcemsghdr ifan
;
1014 struct sockaddr_storage addr
[RTAX_MAX
];
1016 #endif /* RTM_IFANNOUNCE */
1020 /* Fetch routing socket. */
1021 sock
= THREAD_FD (thread
);
1023 nbytes
= read (sock
, &buf
, sizeof buf
);
1027 if (nbytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
)
1028 zlog_warn ("routing socket error: %s", safe_strerror (errno
));
1032 thread_add_read (zebrad
.master
, kernel_read
, NULL
, sock
);
1034 if (IS_ZEBRA_DEBUG_KERNEL
)
1035 rtmsg_debug (&buf
.r
.rtm
);
1040 * Ensure that we didn't drop any data, so that processing routines
1041 * can assume they have the whole message.
1043 if (rtm
->rtm_msglen
!= nbytes
)
1045 zlog_warn ("kernel_read: rtm->rtm_msglen %d, nbytes %d, type %d\n",
1046 rtm
->rtm_msglen
, nbytes
, rtm
->rtm_type
);
1050 switch (rtm
->rtm_type
)
1058 ifm_read (&buf
.im
.ifm
);
1062 ifam_read (&buf
.ia
.ifa
);
1064 #ifdef RTM_IFANNOUNCE
1065 case RTM_IFANNOUNCE
:
1066 ifan_read (&buf
.ian
.ifan
);
1068 #endif /* RTM_IFANNOUNCE */
1070 if (IS_ZEBRA_DEBUG_KERNEL
)
1071 zlog_debug("Unprocessed RTM_type: %d", rtm
->rtm_type
);
1077 /* Make routing socket. */
1079 routing_socket (void)
1081 if ( zserv_privs
.change (ZPRIVS_RAISE
) )
1082 zlog_err ("routing_socket: Can't raise privileges");
1084 routing_sock
= socket (AF_ROUTE
, SOCK_RAW
, 0);
1086 if (routing_sock
< 0)
1088 if ( zserv_privs
.change (ZPRIVS_LOWER
) )
1089 zlog_err ("routing_socket: Can't lower privileges");
1090 zlog_warn ("Can't init kernel routing socket");
1094 /* XXX: Socket should be NONBLOCK, however as we currently
1095 * discard failed writes, this will lead to inconsistencies.
1096 * For now, socket must be blocking.
1098 /*if (fcntl (routing_sock, F_SETFL, O_NONBLOCK) < 0)
1099 zlog_warn ("Can't set O_NONBLOCK to routing socket");*/
1101 if ( zserv_privs
.change (ZPRIVS_LOWER
) )
1102 zlog_err ("routing_socket: Can't lower privileges");
1104 /* kernel_read needs rewrite. */
1105 thread_add_read (zebrad
.master
, kernel_read
, NULL
, routing_sock
);
1108 /* Exported interface function. This function simply calls
1109 routing_socket (). */