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ca776988 | 1 | /* |
2 | * | |
3 | * Copyright (C) 2000 Robert Olsson. | |
4 | * Swedish University of Agricultural Sciences | |
5 | * | |
6 | * This file is part of GNU Zebra. | |
7 | * | |
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 | |
11 | * later version. | |
12 | * | |
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. | |
17 | * | |
896014f4 DL |
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 | |
ca776988 | 21 | */ |
22 | ||
d62a17ae | 23 | /* |
ca776988 | 24 | * This work includes work with the following copywrite: |
25 | * | |
26 | * Copyright (C) 1997, 2000 Kunihiro Ishiguro | |
27 | * | |
28 | */ | |
29 | ||
d62a17ae | 30 | /* |
43e52561 | 31 | * Thanks to Jens Laas at Swedish University of Agricultural Sciences |
ca776988 | 32 | * for reviewing and tests. |
33 | */ | |
34 | ||
35 | ||
36 | #include <zebra.h> | |
37 | ||
ca776988 | 38 | #include "if.h" |
39 | #include "vty.h" | |
40 | #include "sockunion.h" | |
c9e52be3 | 41 | #include "sockopt.h" |
ca776988 | 42 | #include "prefix.h" |
43 | #include "command.h" | |
44 | #include "memory.h" | |
45 | #include "stream.h" | |
46 | #include "ioctl.h" | |
47 | #include "connected.h" | |
48 | #include "log.h" | |
49 | #include "zclient.h" | |
50 | #include "thread.h" | |
25dac855 | 51 | #include "privs.h" |
ead4ee99 | 52 | #include "libfrr.h" |
43e52561 | 53 | #include "lib_errors.h" |
09781197 | 54 | #include "lib/version.h" |
ca776988 | 55 | #include "zebra/interface.h" |
56 | #include "zebra/rtadv.h" | |
57 | #include "zebra/rib.h" | |
3801e764 | 58 | #include "zebra/zebra_router.h" |
ca776988 | 59 | #include "zebra/redistribute.h" |
60 | #include "zebra/irdp.h" | |
364fed6b | 61 | #include "zebra/zebra_errors.h" |
ca776988 | 62 | #include <netinet/ip_icmp.h> |
63 | ||
ab0f6155 | 64 | #include "checksum.h" |
ca776988 | 65 | #include "if.h" |
66 | #include "sockunion.h" | |
67 | #include "log.h" | |
5920b3eb | 68 | #include "network.h" |
ca776988 | 69 | |
70 | /* GLOBAL VARS */ | |
71 | ||
25dac855 | 72 | extern struct zebra_privs_t zserv_privs; |
73 | ||
ca776988 | 74 | struct thread *t_irdp_raw; |
75 | ||
76 | /* Timer interval of irdp. */ | |
77 | int irdp_timer_interval = IRDP_DEFAULT_INTERVAL; | |
78 | ||
d62a17ae | 79 | int irdp_sock_init(void) |
ca776988 | 80 | { |
d62a17ae | 81 | int ret, i; |
82 | int save_errno; | |
83 | int sock; | |
84 | ||
0cf6db21 | 85 | frr_with_privs(&zserv_privs) { |
d62a17ae | 86 | |
01b9e3fd DL |
87 | sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
88 | save_errno = errno; | |
d62a17ae | 89 | |
01b9e3fd | 90 | } |
d62a17ae | 91 | |
92 | if (sock < 0) { | |
1c50c1c0 | 93 | flog_err_sys(EC_LIB_SOCKET, "IRDP: can't create irdp socket %s", |
9df414fe | 94 | safe_strerror(save_errno)); |
d62a17ae | 95 | return sock; |
96 | }; | |
97 | ||
98 | i = 1; | |
99 | ret = setsockopt(sock, IPPROTO_IP, IP_TTL, (void *)&i, sizeof(i)); | |
100 | if (ret < 0) { | |
450971aa | 101 | flog_err_sys(EC_LIB_SOCKET, "IRDP: can't do irdp sockopt %s", |
9df414fe | 102 | safe_strerror(errno)); |
d62a17ae | 103 | close(sock); |
104 | return ret; | |
105 | }; | |
106 | ||
107 | ret = setsockopt_ifindex(AF_INET, sock, 1); | |
108 | if (ret < 0) { | |
450971aa | 109 | flog_err_sys(EC_LIB_SOCKET, "IRDP: can't do irdp sockopt %s", |
9df414fe | 110 | safe_strerror(errno)); |
d62a17ae | 111 | close(sock); |
112 | return ret; | |
113 | }; | |
114 | ||
3801e764 | 115 | thread_add_read(zrouter.master, irdp_read_raw, NULL, sock, &t_irdp_raw); |
d62a17ae | 116 | |
117 | return sock; | |
ca776988 | 118 | } |
119 | ||
120 | ||
d62a17ae | 121 | static int get_pref(struct irdp_interface *irdp, struct prefix *p) |
ca776988 | 122 | { |
d62a17ae | 123 | struct listnode *node; |
124 | struct Adv *adv; | |
125 | ||
126 | /* Use default preference or use the override pref */ | |
127 | ||
128 | if (irdp->AdvPrefList == NULL) | |
129 | return irdp->Preference; | |
130 | ||
131 | for (ALL_LIST_ELEMENTS_RO(irdp->AdvPrefList, node, adv)) | |
132 | if (p->u.prefix4.s_addr == adv->ip.s_addr) | |
133 | return adv->pref; | |
134 | ||
135 | return irdp->Preference; | |
ca776988 | 136 | } |
137 | ||
138 | /* Make ICMP Router Advertisement Message. */ | |
d62a17ae | 139 | static int make_advertisement_packet(struct interface *ifp, struct prefix *p, |
140 | struct stream *s) | |
ca776988 | 141 | { |
d62a17ae | 142 | struct zebra_if *zi = ifp->info; |
ead4ee99 | 143 | struct irdp_interface *irdp = zi->irdp; |
d62a17ae | 144 | int size; |
145 | int pref; | |
d7c0a89a | 146 | uint16_t checksum; |
d62a17ae | 147 | |
148 | pref = get_pref(irdp, p); | |
149 | ||
150 | stream_putc(s, ICMP_ROUTERADVERT); /* Type. */ | |
151 | stream_putc(s, 0); /* Code. */ | |
152 | stream_putw(s, 0); /* Checksum. */ | |
153 | stream_putc(s, 1); /* Num address. */ | |
154 | stream_putc(s, 2); /* Address Entry Size. */ | |
155 | ||
156 | if (irdp->flags & IF_SHUTDOWN) | |
157 | stream_putw(s, 0); | |
158 | else | |
159 | stream_putw(s, irdp->Lifetime); | |
160 | ||
161 | stream_putl(s, htonl(p->u.prefix4.s_addr)); /* Router address. */ | |
162 | stream_putl(s, pref); | |
163 | ||
164 | /* in_cksum return network byte order value */ | |
165 | size = 16; | |
166 | checksum = in_cksum(s->data, size); | |
167 | stream_putw_at(s, 2, htons(checksum)); | |
168 | ||
169 | return size; | |
ca776988 | 170 | } |
171 | ||
d62a17ae | 172 | static void irdp_send(struct interface *ifp, struct prefix *p, struct stream *s) |
ca776988 | 173 | { |
d62a17ae | 174 | struct zebra_if *zi = ifp->info; |
ead4ee99 | 175 | struct irdp_interface *irdp = zi->irdp; |
d7c0a89a QY |
176 | uint32_t dst; |
177 | uint32_t ttl = 1; | |
d62a17ae | 178 | |
ead4ee99 DL |
179 | if (!irdp) |
180 | return; | |
d62a17ae | 181 | if (!(ifp->flags & IFF_UP)) |
182 | return; | |
183 | ||
184 | if (irdp->flags & IF_BROADCAST) | |
185 | dst = INADDR_BROADCAST; | |
186 | else | |
187 | dst = htonl(INADDR_ALLHOSTS_GROUP); | |
188 | ||
189 | if (irdp->flags & IF_DEBUG_MESSAGES) | |
2dbe669b DA |
190 | zlog_debug( |
191 | "IRDP: TX Advert on %s %pFX Holdtime=%d Preference=%d", | |
192 | ifp->name, p, | |
193 | irdp->flags & IF_SHUTDOWN ? 0 : irdp->Lifetime, | |
194 | get_pref(irdp, p)); | |
d62a17ae | 195 | |
196 | send_packet(ifp, s, dst, p, ttl); | |
ca776988 | 197 | } |
198 | ||
d62a17ae | 199 | static void irdp_advertisement(struct interface *ifp, struct prefix *p) |
ca776988 | 200 | { |
d62a17ae | 201 | struct stream *s; |
202 | s = stream_new(128); | |
203 | make_advertisement_packet(ifp, p, s); | |
204 | irdp_send(ifp, p, s); | |
205 | stream_free(s); | |
ca776988 | 206 | } |
207 | ||
cc9f21da | 208 | void irdp_send_thread(struct thread *t_advert) |
ca776988 | 209 | { |
d7c0a89a | 210 | uint32_t timer, tmp; |
d62a17ae | 211 | struct interface *ifp = THREAD_ARG(t_advert); |
212 | struct zebra_if *zi = ifp->info; | |
ead4ee99 | 213 | struct irdp_interface *irdp = zi->irdp; |
d62a17ae | 214 | struct prefix *p; |
215 | struct listnode *node, *nnode; | |
216 | struct connected *ifc; | |
217 | ||
ead4ee99 | 218 | if (!irdp) |
cc9f21da | 219 | return; |
ead4ee99 | 220 | |
d62a17ae | 221 | irdp->flags &= ~IF_SOLICIT; |
222 | ||
223 | if (ifp->connected) | |
224 | for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, ifc)) { | |
225 | p = ifc->address; | |
226 | ||
227 | if (p->family != AF_INET) | |
228 | continue; | |
229 | ||
230 | irdp_advertisement(ifp, p); | |
231 | irdp->irdp_sent++; | |
232 | } | |
233 | ||
234 | tmp = irdp->MaxAdvertInterval - irdp->MinAdvertInterval; | |
5920b3eb | 235 | timer = frr_weak_random() % (tmp + 1); |
d62a17ae | 236 | timer = irdp->MinAdvertInterval + timer; |
237 | ||
238 | if (irdp->irdp_sent < MAX_INITIAL_ADVERTISEMENTS | |
239 | && timer > MAX_INITIAL_ADVERT_INTERVAL) | |
240 | timer = MAX_INITIAL_ADVERT_INTERVAL; | |
241 | ||
242 | if (irdp->flags & IF_DEBUG_MISC) | |
9165c5f5 | 243 | zlog_debug("IRDP: New timer for %s set to %u", ifp->name, |
d62a17ae | 244 | timer); |
245 | ||
246 | irdp->t_advertise = NULL; | |
3801e764 | 247 | thread_add_timer(zrouter.master, irdp_send_thread, ifp, timer, |
d62a17ae | 248 | &irdp->t_advertise); |
ca776988 | 249 | } |
250 | ||
251 | void irdp_advert_off(struct interface *ifp) | |
252 | { | |
d62a17ae | 253 | struct zebra_if *zi = ifp->info; |
ead4ee99 | 254 | struct irdp_interface *irdp = zi->irdp; |
d62a17ae | 255 | struct listnode *node, *nnode; |
256 | int i; | |
257 | struct connected *ifc; | |
258 | struct prefix *p; | |
259 | ||
ead4ee99 DL |
260 | if (!irdp) |
261 | return; | |
262 | ||
b3d6bc6e | 263 | thread_cancel(&irdp->t_advertise); |
d62a17ae | 264 | |
265 | if (ifp->connected) | |
266 | for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, ifc)) { | |
267 | p = ifc->address; | |
268 | ||
269 | /* Output some packets with Lifetime 0 | |
270 | we should add a wait... | |
271 | */ | |
272 | ||
273 | for (i = 0; i < IRDP_LAST_ADVERT_MESSAGES; i++) { | |
274 | irdp->irdp_sent++; | |
275 | irdp_advertisement(ifp, p); | |
276 | } | |
277 | } | |
ca776988 | 278 | } |
279 | ||
280 | ||
d62a17ae | 281 | void process_solicit(struct interface *ifp) |
ca776988 | 282 | { |
d62a17ae | 283 | struct zebra_if *zi = ifp->info; |
ead4ee99 | 284 | struct irdp_interface *irdp = zi->irdp; |
d7c0a89a | 285 | uint32_t timer; |
ca776988 | 286 | |
ead4ee99 DL |
287 | if (!irdp) |
288 | return; | |
289 | ||
d62a17ae | 290 | /* When SOLICIT is active we reject further incoming solicits |
291 | this keeps down the answering rate so we don't have think | |
292 | about DoS attacks here. */ | |
ca776988 | 293 | |
d62a17ae | 294 | if (irdp->flags & IF_SOLICIT) |
295 | return; | |
ca776988 | 296 | |
d62a17ae | 297 | irdp->flags |= IF_SOLICIT; |
b3d6bc6e | 298 | thread_cancel(&irdp->t_advertise); |
ca776988 | 299 | |
5920b3eb | 300 | timer = (frr_weak_random() % MAX_RESPONSE_DELAY) + 1; |
ca776988 | 301 | |
d62a17ae | 302 | irdp->t_advertise = NULL; |
3801e764 | 303 | thread_add_timer(zrouter.master, irdp_send_thread, ifp, timer, |
d62a17ae | 304 | &irdp->t_advertise); |
ca776988 | 305 | } |
306 | ||
2eb27eec | 307 | static int irdp_finish(void) |
ca776988 | 308 | { |
d62a17ae | 309 | struct vrf *vrf; |
d62a17ae | 310 | struct interface *ifp; |
311 | struct zebra_if *zi; | |
312 | struct irdp_interface *irdp; | |
313 | ||
314 | zlog_info("IRDP: Received shutdown notification."); | |
315 | ||
a2addae8 | 316 | RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id) |
451fda4f | 317 | FOR_ALL_INTERFACES (vrf, ifp) { |
a2addae8 RW |
318 | zi = ifp->info; |
319 | ||
320 | if (!zi) | |
321 | continue; | |
322 | irdp = zi->irdp; | |
323 | if (!irdp) | |
324 | continue; | |
325 | ||
326 | if (irdp->flags & IF_ACTIVE) { | |
327 | irdp->flags |= IF_SHUTDOWN; | |
328 | irdp_advert_off(ifp); | |
329 | } | |
d62a17ae | 330 | } |
ead4ee99 | 331 | return 0; |
ca776988 | 332 | } |
333 | ||
8dc1f7fc | 334 | static int irdp_init(struct thread_master *master) |
2eb27eec DL |
335 | { |
336 | irdp_if_init(); | |
337 | ||
338 | hook_register(frr_early_fini, irdp_finish); | |
8dc1f7fc DL |
339 | return 0; |
340 | } | |
341 | ||
342 | static int irdp_module_init(void) | |
343 | { | |
344 | hook_register(frr_late_init, irdp_init); | |
345 | return 0; | |
2eb27eec DL |
346 | } |
347 | ||
996c9314 | 348 | FRR_MODULE_SETUP(.name = "zebra_irdp", .version = FRR_VERSION, |
80413c20 DL |
349 | .description = "zebra IRDP module", .init = irdp_module_init, |
350 | ); |