3 * Copyright (C) 2000 Robert Olsson.
4 * Swedish University of Agricultural Sciences
6 * This file is part of GNU Zebra.
8 * GNU Zebra is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2, or (at your option) any
13 * GNU Zebra is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; see the file COPYING; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 * This work includes work with the following copywrite:
26 * Copyright (C) 1997, 2000 Kunihiro Ishiguro
31 * Thanks to Jens Låås at Swedish University of Agricultural Sciences
32 * for reviewing and tests.
40 #include "sockunion.h"
45 #include "zebra_memory.h"
48 #include "connected.h"
55 #include "zebra/interface.h"
56 #include "zebra/rtadv.h"
57 #include "zebra/rib.h"
58 #include "zebra/zserv.h"
59 #include "zebra/redistribute.h"
60 #include "zebra/irdp.h"
61 #include <netinet/ip_icmp.h>
65 #include "sockunion.h"
70 extern struct zebra_privs_t zserv_privs
;
72 struct thread
*t_irdp_raw
;
74 /* Timer interval of irdp. */
75 int irdp_timer_interval
= IRDP_DEFAULT_INTERVAL
;
77 int irdp_sock_init(void)
83 if (zserv_privs
.change(ZPRIVS_RAISE
))
84 zlog_err("irdp_sock_init: could not raise privs, %s",
85 safe_strerror(errno
));
87 sock
= socket(AF_INET
, SOCK_RAW
, IPPROTO_ICMP
);
90 if (zserv_privs
.change(ZPRIVS_LOWER
))
91 zlog_err("irdp_sock_init: could not lower privs, %s",
92 safe_strerror(errno
));
95 zlog_warn("IRDP: can't create irdp socket %s",
96 safe_strerror(save_errno
));
101 ret
= setsockopt(sock
, IPPROTO_IP
, IP_TTL
, (void *)&i
, sizeof(i
));
103 zlog_warn("IRDP: can't do irdp sockopt %s",
104 safe_strerror(errno
));
109 ret
= setsockopt_ifindex(AF_INET
, sock
, 1);
111 zlog_warn("IRDP: can't do irdp sockopt %s",
112 safe_strerror(errno
));
118 thread_add_read(zebrad
.master
, irdp_read_raw
, NULL
, sock
, &t_irdp_raw
);
124 static int get_pref(struct irdp_interface
*irdp
, struct prefix
*p
)
126 struct listnode
*node
;
129 /* Use default preference or use the override pref */
131 if (irdp
->AdvPrefList
== NULL
)
132 return irdp
->Preference
;
134 for (ALL_LIST_ELEMENTS_RO(irdp
->AdvPrefList
, node
, adv
))
135 if (p
->u
.prefix4
.s_addr
== adv
->ip
.s_addr
)
138 return irdp
->Preference
;
141 /* Make ICMP Router Advertisement Message. */
142 static int make_advertisement_packet(struct interface
*ifp
, struct prefix
*p
,
145 struct zebra_if
*zi
= ifp
->info
;
146 struct irdp_interface
*irdp
= zi
->irdp
;
151 pref
= get_pref(irdp
, p
);
153 stream_putc(s
, ICMP_ROUTERADVERT
); /* Type. */
154 stream_putc(s
, 0); /* Code. */
155 stream_putw(s
, 0); /* Checksum. */
156 stream_putc(s
, 1); /* Num address. */
157 stream_putc(s
, 2); /* Address Entry Size. */
159 if (irdp
->flags
& IF_SHUTDOWN
)
162 stream_putw(s
, irdp
->Lifetime
);
164 stream_putl(s
, htonl(p
->u
.prefix4
.s_addr
)); /* Router address. */
165 stream_putl(s
, pref
);
167 /* in_cksum return network byte order value */
169 checksum
= in_cksum(s
->data
, size
);
170 stream_putw_at(s
, 2, htons(checksum
));
175 static void irdp_send(struct interface
*ifp
, struct prefix
*p
, struct stream
*s
)
177 struct zebra_if
*zi
= ifp
->info
;
178 struct irdp_interface
*irdp
= zi
->irdp
;
179 char buf
[PREFIX_STRLEN
];
185 if (!(ifp
->flags
& IFF_UP
))
188 if (irdp
->flags
& IF_BROADCAST
)
189 dst
= INADDR_BROADCAST
;
191 dst
= htonl(INADDR_ALLHOSTS_GROUP
);
193 if (irdp
->flags
& IF_DEBUG_MESSAGES
)
194 zlog_debug("IRDP: TX Advert on %s %s Holdtime=%d Preference=%d",
195 ifp
->name
, prefix2str(p
, buf
, sizeof buf
),
196 irdp
->flags
& IF_SHUTDOWN
? 0 : irdp
->Lifetime
,
199 send_packet(ifp
, s
, dst
, p
, ttl
);
202 static void irdp_advertisement(struct interface
*ifp
, struct prefix
*p
)
206 make_advertisement_packet(ifp
, p
, s
);
207 irdp_send(ifp
, p
, s
);
211 int irdp_send_thread(struct thread
*t_advert
)
213 u_int32_t timer
, tmp
;
214 struct interface
*ifp
= THREAD_ARG(t_advert
);
215 struct zebra_if
*zi
= ifp
->info
;
216 struct irdp_interface
*irdp
= zi
->irdp
;
218 struct listnode
*node
, *nnode
;
219 struct connected
*ifc
;
224 irdp
->flags
&= ~IF_SOLICIT
;
227 for (ALL_LIST_ELEMENTS(ifp
->connected
, node
, nnode
, ifc
)) {
230 if (p
->family
!= AF_INET
)
233 irdp_advertisement(ifp
, p
);
237 tmp
= irdp
->MaxAdvertInterval
- irdp
->MinAdvertInterval
;
238 timer
= random() % (tmp
+ 1);
239 timer
= irdp
->MinAdvertInterval
+ timer
;
241 if (irdp
->irdp_sent
< MAX_INITIAL_ADVERTISEMENTS
242 && timer
> MAX_INITIAL_ADVERT_INTERVAL
)
243 timer
= MAX_INITIAL_ADVERT_INTERVAL
;
245 if (irdp
->flags
& IF_DEBUG_MISC
)
246 zlog_debug("IRDP: New timer for %s set to %u\n", ifp
->name
,
249 irdp
->t_advertise
= NULL
;
250 thread_add_timer(zebrad
.master
, irdp_send_thread
, ifp
, timer
,
255 void irdp_advert_off(struct interface
*ifp
)
257 struct zebra_if
*zi
= ifp
->info
;
258 struct irdp_interface
*irdp
= zi
->irdp
;
259 struct listnode
*node
, *nnode
;
261 struct connected
*ifc
;
267 if (irdp
->t_advertise
)
268 thread_cancel(irdp
->t_advertise
);
269 irdp
->t_advertise
= NULL
;
272 for (ALL_LIST_ELEMENTS(ifp
->connected
, node
, nnode
, ifc
)) {
275 /* Output some packets with Lifetime 0
276 we should add a wait...
279 for (i
= 0; i
< IRDP_LAST_ADVERT_MESSAGES
; i
++) {
281 irdp_advertisement(ifp
, p
);
287 void process_solicit(struct interface
*ifp
)
289 struct zebra_if
*zi
= ifp
->info
;
290 struct irdp_interface
*irdp
= zi
->irdp
;
296 /* When SOLICIT is active we reject further incoming solicits
297 this keeps down the answering rate so we don't have think
298 about DoS attacks here. */
300 if (irdp
->flags
& IF_SOLICIT
)
303 irdp
->flags
|= IF_SOLICIT
;
304 if (irdp
->t_advertise
)
305 thread_cancel(irdp
->t_advertise
);
306 irdp
->t_advertise
= NULL
;
308 timer
= (random() % MAX_RESPONSE_DELAY
) + 1;
310 irdp
->t_advertise
= NULL
;
311 thread_add_timer(zebrad
.master
, irdp_send_thread
, ifp
, timer
,
315 static int irdp_finish(void)
318 struct interface
*ifp
;
320 struct irdp_interface
*irdp
;
322 zlog_info("IRDP: Received shutdown notification.");
324 RB_FOREACH (vrf
, vrf_id_head
, &vrfs_by_id
)
325 FOR_ALL_INTERFACES (vrf
, ifp
) {
334 if (irdp
->flags
& IF_ACTIVE
) {
335 irdp
->flags
|= IF_SHUTDOWN
;
336 irdp_advert_off(ifp
);
342 static int irdp_init(struct thread_master
*master
)
346 hook_register(frr_early_fini
, irdp_finish
);
350 static int irdp_module_init(void)
352 hook_register(frr_late_init
, irdp_init
);
356 FRR_MODULE_SETUP(.name
= "zebra_irdp", .version
= FRR_VERSION
,
357 .description
= "zebra IRDP module", .init
= irdp_module_init
, )