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8cc47ba2 | 1 | /* |
1a140c64 | 2 | * dhcpcd - IPv6 ND handling |
94354c03 | 3 | * Copyright (c) 2006-2019 Roy Marples <roy@marples.name> |
91cd7324 RM |
4 | * All rights reserved |
5 | ||
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
25 | * SUCH DAMAGE. | |
26 | */ | |
27 | ||
eebe9a18 | 28 | #include <sys/ioctl.h> |
91cd7324 RM |
29 | #include <sys/param.h> |
30 | #include <sys/socket.h> | |
31 | #include <net/if.h> | |
23b899e4 | 32 | #include <net/route.h> |
91cd7324 RM |
33 | #include <netinet/in.h> |
34 | #include <netinet/ip6.h> | |
35 | #include <netinet/icmp6.h> | |
36 | ||
cd09e583 | 37 | #include <assert.h> |
91cd7324 | 38 | #include <errno.h> |
e8c8e9b9 | 39 | #include <fcntl.h> |
91cd7324 RM |
40 | #include <stddef.h> |
41 | #include <stdlib.h> | |
42 | #include <string.h> | |
fbbb0875 | 43 | #include <unistd.h> |
91cd7324 | 44 | |
e5cd8255 | 45 | #define ELOOP_QUEUE 3 |
91cd7324 | 46 | #include "common.h" |
91cd7324 | 47 | #include "dhcpcd.h" |
a1b1f0a8 | 48 | #include "dhcp-common.h" |
d7555c12 | 49 | #include "dhcp6.h" |
91cd7324 | 50 | #include "eloop.h" |
a3ee6b23 | 51 | #include "if.h" |
eebe9a18 | 52 | #include "ipv6.h" |
e82129a4 | 53 | #include "ipv6nd.h" |
94d1ded9 | 54 | #include "logerr.h" |
9aa11487 | 55 | #include "route.h" |
294eff4d | 56 | #include "script.h" |
91cd7324 | 57 | |
d7555c12 RM |
58 | /* Debugging Router Solicitations is a lot of spam, so disable it */ |
59 | //#define DEBUG_RS | |
60 | ||
91cd7324 RM |
61 | #ifndef ND_OPT_RDNSS |
62 | #define ND_OPT_RDNSS 25 | |
63 | struct nd_opt_rdnss { /* RDNSS option RFC 6106 */ | |
64 | uint8_t nd_opt_rdnss_type; | |
65 | uint8_t nd_opt_rdnss_len; | |
66 | uint16_t nd_opt_rdnss_reserved; | |
67 | uint32_t nd_opt_rdnss_lifetime; | |
68 | /* followed by list of IP prefixes */ | |
18fa35e1 RM |
69 | }; |
70 | __CTASSERT(sizeof(struct nd_opt_rdnss) == 8); | |
91cd7324 RM |
71 | #endif |
72 | ||
73 | #ifndef ND_OPT_DNSSL | |
74 | #define ND_OPT_DNSSL 31 | |
75 | struct nd_opt_dnssl { /* DNSSL option RFC 6106 */ | |
76 | uint8_t nd_opt_dnssl_type; | |
77 | uint8_t nd_opt_dnssl_len; | |
78 | uint16_t nd_opt_dnssl_reserved; | |
79 | uint32_t nd_opt_dnssl_lifetime; | |
80 | /* followed by list of DNS servers */ | |
18fa35e1 RM |
81 | }; |
82 | __CTASSERT(sizeof(struct nd_opt_rdnss) == 8); | |
91cd7324 RM |
83 | #endif |
84 | ||
fd3e7f65 RM |
85 | /* Impossible options, so we can easily add extras */ |
86 | #define _ND_OPT_PREFIX_ADDR 255 + 1 | |
87 | ||
eebe9a18 RM |
88 | /* Minimal IPv6 MTU */ |
89 | #ifndef IPV6_MMTU | |
90 | #define IPV6_MMTU 1280 | |
91 | #endif | |
92 | ||
93 | #ifndef ND_RA_FLAG_RTPREF_HIGH | |
94 | #define ND_RA_FLAG_RTPREF_MASK 0x18 | |
95 | #define ND_RA_FLAG_RTPREF_HIGH 0x08 | |
96 | #define ND_RA_FLAG_RTPREF_MEDIUM 0x00 | |
97 | #define ND_RA_FLAG_RTPREF_LOW 0x18 | |
98 | #define ND_RA_FLAG_RTPREF_RSV 0x10 | |
99 | #endif | |
100 | ||
101 | /* RTPREF_MEDIUM has to be 0! */ | |
102 | #define RTPREF_HIGH 1 | |
103 | #define RTPREF_MEDIUM 0 | |
104 | #define RTPREF_LOW (-1) | |
105 | #define RTPREF_RESERVED (-2) | |
106 | #define RTPREF_INVALID (-3) /* internal */ | |
107 | ||
19005560 RM |
108 | #define EXPIRED_MAX 5 /* Remember 5 expired routers to avoid |
109 | logspam. */ | |
110 | ||
e82129a4 RM |
111 | #define MIN_RANDOM_FACTOR 500 /* millisecs */ |
112 | #define MAX_RANDOM_FACTOR 1500 /* millisecs */ | |
113 | #define MIN_RANDOM_FACTOR_U MIN_RANDOM_FACTOR * 1000 /* usecs */ | |
114 | #define MAX_RANDOM_FACTOR_U MAX_RANDOM_FACTOR * 1000 /* usecs */ | |
115 | ||
116 | #if BYTE_ORDER == BIG_ENDIAN | |
117 | #define IPV6_ADDR_INT32_ONE 1 | |
118 | #define IPV6_ADDR_INT16_MLL 0xff02 | |
119 | #elif BYTE_ORDER == LITTLE_ENDIAN | |
120 | #define IPV6_ADDR_INT32_ONE 0x01000000 | |
121 | #define IPV6_ADDR_INT16_MLL 0x02ff | |
122 | #endif | |
123 | ||
124 | /* Debugging Neighbor Solicitations is a lot of spam, so disable it */ | |
125 | //#define DEBUG_NS | |
126 | // | |
127 | ||
8d5de853 | 128 | static void ipv6nd_handledata(void *); |
7cece083 | 129 | |
65e5b9f9 RM |
130 | /* |
131 | * Android ships buggy ICMP6 filter headers. | |
132 | * Supply our own until they fix their shit. | |
133 | * References: | |
134 | * https://android-review.googlesource.com/#/c/58438/ | |
135 | * http://code.google.com/p/android/issues/original?id=32621&seq=24 | |
136 | */ | |
137 | #ifdef __ANDROID__ | |
138 | #undef ICMP6_FILTER_WILLPASS | |
139 | #undef ICMP6_FILTER_WILLBLOCK | |
140 | #undef ICMP6_FILTER_SETPASS | |
141 | #undef ICMP6_FILTER_SETBLOCK | |
142 | #undef ICMP6_FILTER_SETPASSALL | |
143 | #undef ICMP6_FILTER_SETBLOCKALL | |
144 | #define ICMP6_FILTER_WILLPASS(type, filterp) \ | |
145 | ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) == 0) | |
146 | #define ICMP6_FILTER_WILLBLOCK(type, filterp) \ | |
147 | ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) != 0) | |
148 | #define ICMP6_FILTER_SETPASS(type, filterp) \ | |
149 | ((((filterp)->icmp6_filt[(type) >> 5]) &= ~(1 << ((type) & 31)))) | |
150 | #define ICMP6_FILTER_SETBLOCK(type, filterp) \ | |
151 | ((((filterp)->icmp6_filt[(type) >> 5]) |= (1 << ((type) & 31)))) | |
152 | #define ICMP6_FILTER_SETPASSALL(filterp) \ | |
153 | memset(filterp, 0, sizeof(struct icmp6_filter)); | |
154 | #define ICMP6_FILTER_SETBLOCKALL(filterp) \ | |
155 | memset(filterp, 0xff, sizeof(struct icmp6_filter)); | |
156 | #endif | |
157 | ||
62247de8 RM |
158 | /* Support older systems with different defines */ |
159 | #if !defined(IPV6_RECVHOPLIMIT) && defined(IPV6_HOPLIMIT) | |
160 | #define IPV6_RECVHOPLIMIT IPV6_HOPLIMIT | |
161 | #endif | |
162 | #if !defined(IPV6_RECVPKTINFO) && defined(IPV6_PKTINFO) | |
163 | #define IPV6_RECVPKTINFO IPV6_PKTINFO | |
164 | #endif | |
165 | ||
f1df29d2 RM |
166 | /* Handy defines */ |
167 | #define ipv6nd_free_ra(ra) ipv6nd_freedrop_ra((ra), 0) | |
168 | #define ipv6nd_drop_ra(ra) ipv6nd_freedrop_ra((ra), 1) | |
169 | ||
2be15e88 RM |
170 | void |
171 | ipv6nd_printoptions(const struct dhcpcd_ctx *ctx, | |
172 | const struct dhcp_opt *opts, size_t opts_len) | |
173 | { | |
174 | size_t i, j; | |
175 | const struct dhcp_opt *opt, *opt2; | |
176 | int cols; | |
177 | ||
178 | for (i = 0, opt = ctx->nd_opts; | |
179 | i < ctx->nd_opts_len; i++, opt++) | |
180 | { | |
181 | for (j = 0, opt2 = opts; j < opts_len; j++, opt2++) | |
182 | if (opt2->option == opt->option) | |
183 | break; | |
184 | if (j == opts_len) { | |
185 | cols = printf("%03d %s", opt->option, opt->var); | |
186 | dhcp_print_option_encoding(opt, cols); | |
187 | } | |
188 | } | |
189 | for (i = 0, opt = opts; i < opts_len; i++, opt++) { | |
190 | cols = printf("%03d %s", opt->option, opt->var); | |
191 | dhcp_print_option_encoding(opt, cols); | |
192 | } | |
193 | } | |
194 | ||
aae24feb | 195 | static int |
d48bfc96 | 196 | ipv6nd_open0(void) |
91cd7324 | 197 | { |
b2edc303 | 198 | int s, on; |
4eb7b489 | 199 | struct icmp6_filter filt; |
91cd7324 | 200 | |
9843976a | 201 | #define SOCK_FLAGS SOCK_CLOEXEC | SOCK_NONBLOCK |
b2edc303 | 202 | s = xsocket(PF_INET6, SOCK_RAW | SOCK_FLAGS, IPPROTO_ICMPV6); |
9843976a | 203 | #undef SOCK_FLAGS |
b2edc303 | 204 | if (s == -1) |
fbbb0875 RM |
205 | return -1; |
206 | ||
cc431339 RM |
207 | /* RFC4861 4.1 */ |
208 | on = 255; | |
b2edc303 | 209 | if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, |
4eb7b489 | 210 | &on, sizeof(on)) == -1) |
fbbb0875 | 211 | goto eexit; |
91cd7324 RM |
212 | |
213 | on = 1; | |
b2edc303 | 214 | if (setsockopt(s, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, |
4eb7b489 | 215 | &on, sizeof(on)) == -1) |
fbbb0875 | 216 | goto eexit; |
91cd7324 RM |
217 | |
218 | ICMP6_FILTER_SETBLOCKALL(&filt); | |
4eb7b489 | 219 | ICMP6_FILTER_SETPASS(ND_NEIGHBOR_ADVERT, &filt); |
91cd7324 | 220 | ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt); |
b2edc303 | 221 | if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, |
4eb7b489 | 222 | &filt, sizeof(filt)) == -1) |
fbbb0875 | 223 | goto eexit; |
fbbb0875 | 224 | |
b2edc303 | 225 | return s; |
e82129a4 RM |
226 | |
227 | eexit: | |
b2edc303 | 228 | close(s); |
e82129a4 RM |
229 | return -1; |
230 | } | |
231 | ||
b2edc303 RM |
232 | #ifdef __sun |
233 | static int | |
234 | ipv6nd_open(struct interface *ifp) | |
235 | { | |
236 | int s; | |
237 | struct ipv6_mreq mreq = { | |
e275f240 | 238 | .ipv6mr_multiaddr = IN6ADDR_LINKLOCAL_ALLNODES_INIT, |
b2edc303 RM |
239 | .ipv6mr_interface = ifp->index |
240 | }; | |
241 | struct rs_state *state = RS_STATE(ifp); | |
6fcd7ff4 | 242 | uint_t ifindex = ifp->index; |
b2edc303 RM |
243 | |
244 | if (state->nd_fd != -1) | |
245 | return state->nd_fd; | |
246 | ||
247 | s = ipv6nd_open0(); | |
248 | if (s == -1) | |
249 | return -1; | |
250 | ||
6fcd7ff4 RM |
251 | if (setsockopt(s, IPPROTO_IPV6, IPV6_BOUND_IF, |
252 | &ifindex, sizeof(ifindex)) == -1) | |
253 | { | |
254 | close(s); | |
255 | return -1; | |
256 | } | |
257 | ||
b2edc303 RM |
258 | if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, |
259 | &mreq, sizeof(mreq)) == -1) | |
260 | { | |
261 | close(s); | |
262 | return -1; | |
263 | } | |
264 | ||
265 | state->nd_fd = s; | |
266 | eloop_event_add(ifp->ctx->eloop, s, ipv6nd_handledata, ifp); | |
267 | return s; | |
268 | } | |
269 | #else | |
270 | static int | |
271 | ipv6nd_open(struct dhcpcd_ctx *ctx) | |
272 | { | |
b0a0f6d4 | 273 | int s, on; |
b2edc303 RM |
274 | |
275 | if (ctx->nd_fd != -1) | |
276 | return ctx->nd_fd; | |
277 | ||
b0a0f6d4 RM |
278 | s = ipv6nd_open0(); |
279 | if (s == -1) | |
280 | return -1; | |
281 | ||
b2edc303 RM |
282 | on = 1; |
283 | if (setsockopt(s, IPPROTO_IPV6, IPV6_RECVPKTINFO, | |
284 | &on, sizeof(on)) == -1) | |
285 | { | |
286 | close(s); | |
287 | return -1; | |
288 | } | |
289 | ||
290 | ctx->nd_fd = s; | |
291 | eloop_event_add(ctx->eloop, s, ipv6nd_handledata, ctx); | |
292 | return s; | |
293 | } | |
294 | #endif | |
295 | ||
e82129a4 RM |
296 | static int |
297 | ipv6nd_makersprobe(struct interface *ifp) | |
91cd7324 | 298 | { |
ca15a0aa | 299 | struct rs_state *state; |
91cd7324 | 300 | struct nd_router_solicit *rs; |
91cd7324 | 301 | |
ca15a0aa RM |
302 | state = RS_STATE(ifp); |
303 | free(state->rs); | |
ba71fb8b RM |
304 | state->rslen = sizeof(*rs); |
305 | if (ifp->hwlen != 0) | |
306 | state->rslen += (size_t)ROUNDUP8(ifp->hwlen + 2); | |
10e17e3f | 307 | state->rs = calloc(1, state->rslen); |
ca15a0aa | 308 | if (state->rs == NULL) |
91cd7324 | 309 | return -1; |
2e704972 | 310 | rs = state->rs; |
91cd7324 | 311 | rs->nd_rs_type = ND_ROUTER_SOLICIT; |
2e704972 RM |
312 | //rs->nd_rs_code = 0; |
313 | //rs->nd_rs_cksum = 0; | |
314 | //rs->nd_rs_reserved = 0; | |
ba71fb8b RM |
315 | |
316 | if (ifp->hwlen != 0) { | |
317 | struct nd_opt_hdr *nd; | |
318 | ||
2e704972 | 319 | nd = (struct nd_opt_hdr *)(state->rs + 1); |
ba71fb8b RM |
320 | nd->nd_opt_type = ND_OPT_SOURCE_LINKADDR; |
321 | nd->nd_opt_len = (uint8_t)((ROUNDUP8(ifp->hwlen + 2)) >> 3); | |
322 | memcpy(nd + 1, ifp->hwaddr, ifp->hwlen); | |
323 | } | |
91cd7324 RM |
324 | return 0; |
325 | } | |
673e81e5 | 326 | |
91cd7324 | 327 | static void |
e82129a4 | 328 | ipv6nd_sendrsprobe(void *arg) |
91cd7324 RM |
329 | { |
330 | struct interface *ifp = arg; | |
5fed9d43 | 331 | struct rs_state *state = RS_STATE(ifp); |
4d53b9d9 RM |
332 | struct sockaddr_in6 dst = { |
333 | .sin6_family = AF_INET6, | |
334 | .sin6_addr = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT, | |
335 | .sin6_scope_id = ifp->index, | |
336 | }; | |
5fed9d43 RM |
337 | struct iovec iov = { .iov_base = state->rs, .iov_len = state->rslen }; |
338 | unsigned char ctl[CMSG_SPACE(sizeof(struct in6_pktinfo))] = { 0 }; | |
339 | struct msghdr msg = { | |
340 | .msg_name = &dst, .msg_namelen = sizeof(dst), | |
341 | .msg_iov = &iov, .msg_iovlen = 1, | |
342 | .msg_control = ctl, .msg_controllen = sizeof(ctl), | |
343 | }; | |
91cd7324 | 344 | struct cmsghdr *cm; |
5fed9d43 | 345 | struct in6_pktinfo pi = { .ipi6_ifindex = ifp->index }; |
b2edc303 | 346 | int s; |
91cd7324 | 347 | |
0e906716 | 348 | if (ipv6_linklocal(ifp) == NULL) { |
0e56d022 | 349 | logdebugx("%s: delaying Router Solicitation for LL address", |
5331b839 | 350 | ifp->name); |
e82129a4 | 351 | ipv6_addlinklocalcallback(ifp, ipv6nd_sendrsprobe, ifp); |
5331b839 RM |
352 | return; |
353 | } | |
354 | ||
4356c648 | 355 | #ifdef HAVE_SA_LEN |
4eb7b489 RM |
356 | dst.sin6_len = sizeof(dst); |
357 | #endif | |
91cd7324 RM |
358 | |
359 | /* Set the outbound interface */ | |
5fed9d43 | 360 | cm = CMSG_FIRSTHDR(&msg); |
8fc52ced RM |
361 | if (cm == NULL) /* unlikely */ |
362 | return; | |
91cd7324 RM |
363 | cm->cmsg_level = IPPROTO_IPV6; |
364 | cm->cmsg_type = IPV6_PKTINFO; | |
365 | cm->cmsg_len = CMSG_LEN(sizeof(pi)); | |
91cd7324 RM |
366 | memcpy(CMSG_DATA(cm), &pi, sizeof(pi)); |
367 | ||
0e56d022 | 368 | logdebugx("%s: sending Router Solicitation", ifp->name); |
b2edc303 RM |
369 | #ifdef __sun |
370 | s = state->nd_fd; | |
371 | #else | |
372 | s = ifp->ctx->nd_fd; | |
373 | #endif | |
374 | if (sendmsg(s, &msg, 0) == -1) { | |
94d1ded9 | 375 | logerr(__func__); |
9299f1c6 RM |
376 | /* Allow IPv6ND to continue .... at most a few errors |
377 | * would be logged. | |
378 | * Generally the error is ENOBUFS when struggling to | |
379 | * associate with an access point. */ | |
83e82504 | 380 | } |
91cd7324 | 381 | |
ca15a0aa | 382 | if (state->rsprobes++ < MAX_RTR_SOLICITATIONS) |
4eb7b489 RM |
383 | eloop_timeout_add_sec(ifp->ctx->eloop, |
384 | RTR_SOLICITATION_INTERVAL, ipv6nd_sendrsprobe, ifp); | |
2f53bfd4 | 385 | else { |
94d1ded9 | 386 | logwarnx("%s: no IPv6 Routers available", ifp->name); |
2f53bfd4 | 387 | ipv6nd_drop(ifp); |
2f53bfd4 RM |
388 | } |
389 | } | |
390 | ||
cd09e583 RM |
391 | static void |
392 | ipv6nd_sendadvertisement(void *arg) | |
393 | { | |
394 | struct ipv6_addr *ia = arg; | |
395 | struct interface *ifp = ia->iface; | |
396 | struct dhcpcd_ctx *ctx = ifp->ctx; | |
5fed9d43 RM |
397 | struct sockaddr_in6 dst = { |
398 | .sin6_family = AF_INET6, | |
4d53b9d9 | 399 | .sin6_addr = IN6ADDR_LINKLOCAL_ALLNODES_INIT, |
5fed9d43 RM |
400 | .sin6_scope_id = ifp->index, |
401 | }; | |
402 | struct iovec iov = { .iov_base = ia->na, .iov_len = ia->na_len }; | |
403 | unsigned char ctl[CMSG_SPACE(sizeof(struct in6_pktinfo))] = { 0 }; | |
404 | struct msghdr msg = { | |
405 | .msg_name = &dst, .msg_namelen = sizeof(dst), | |
406 | .msg_iov = &iov, .msg_iovlen = 1, | |
407 | .msg_control = ctl, .msg_controllen = sizeof(ctl), | |
408 | }; | |
cd09e583 | 409 | struct cmsghdr *cm; |
5fed9d43 | 410 | struct in6_pktinfo pi = { .ipi6_ifindex = ifp->index }; |
cd09e583 | 411 | const struct rs_state *state = RS_CSTATE(ifp); |
b2edc303 | 412 | int s; |
cd09e583 | 413 | |
3458df61 | 414 | if (state == NULL || ifp->carrier <= LINK_DOWN) |
cd09e583 RM |
415 | goto freeit; |
416 | ||
cd09e583 RM |
417 | #ifdef SIN6_LEN |
418 | dst.sin6_len = sizeof(dst); | |
419 | #endif | |
cd09e583 | 420 | |
cd09e583 | 421 | /* Set the outbound interface. */ |
5fed9d43 | 422 | cm = CMSG_FIRSTHDR(&msg); |
cd09e583 RM |
423 | assert(cm != NULL); |
424 | cm->cmsg_level = IPPROTO_IPV6; | |
425 | cm->cmsg_type = IPV6_PKTINFO; | |
426 | cm->cmsg_len = CMSG_LEN(sizeof(pi)); | |
cd09e583 | 427 | memcpy(CMSG_DATA(cm), &pi, sizeof(pi)); |
cd09e583 | 428 | logdebugx("%s: sending NA for %s", ifp->name, ia->saddr); |
b2edc303 RM |
429 | #ifdef __sun |
430 | s = state->nd_fd; | |
431 | #else | |
432 | s = ctx->nd_fd; | |
433 | #endif | |
434 | if (sendmsg(s, &msg, 0) == -1) | |
fcc399ee RM |
435 | #ifdef __OpenBSD__ |
436 | /* This isn't too critical as they don't support IPv6 address sharing */ | |
437 | #warning Cannot send NA messages on OpenBSD | |
438 | logdebug(__func__); | |
439 | #else | |
cd09e583 | 440 | logerr(__func__); |
fcc399ee | 441 | #endif |
cd09e583 RM |
442 | |
443 | if (++ia->na_count < MAX_NEIGHBOR_ADVERTISEMENT) { | |
444 | eloop_timeout_add_sec(ctx->eloop, | |
445 | state->retrans / 1000, ipv6nd_sendadvertisement, ia); | |
446 | return; | |
447 | } | |
448 | ||
449 | freeit: | |
450 | free(ia->na); | |
451 | ia->na = NULL; | |
452 | ia->na_count = 0; | |
453 | } | |
454 | ||
455 | void | |
456 | ipv6nd_advertise(struct ipv6_addr *ia) | |
457 | { | |
458 | struct dhcpcd_ctx *ctx; | |
459 | struct interface *ifp; | |
460 | struct ipv6_state *state; | |
461 | struct ipv6_addr *iap, *iaf; | |
462 | struct nd_neighbor_advert *na; | |
463 | ||
464 | if (IN6_IS_ADDR_MULTICAST(&ia->addr)) | |
465 | return; | |
466 | ||
467 | ctx = ia->iface->ctx; | |
cd09e583 RM |
468 | /* Find the most preferred address to advertise. */ |
469 | iaf = NULL; | |
470 | TAILQ_FOREACH(ifp, ctx->ifaces, next) { | |
471 | state = IPV6_STATE(ifp); | |
3458df61 | 472 | if (state == NULL || ifp->carrier <= LINK_DOWN) |
cd09e583 RM |
473 | continue; |
474 | ||
475 | TAILQ_FOREACH(iap, &state->addrs, next) { | |
476 | if (!IN6_ARE_ADDR_EQUAL(&iap->addr, &ia->addr)) | |
477 | continue; | |
478 | ||
479 | /* Cancel any current advertisement. */ | |
480 | eloop_timeout_delete(ctx->eloop, | |
481 | ipv6nd_sendadvertisement, iap); | |
482 | ||
483 | /* Don't advertise what we can't use. */ | |
484 | if (iap->prefix_vltime == 0 || | |
485 | iap->addr_flags & IN6_IFF_NOTUSEABLE) | |
486 | continue; | |
487 | ||
7d58ddf0 RM |
488 | if (iaf == NULL || |
489 | iaf->iface->metric > iap->iface->metric) | |
cd09e583 RM |
490 | iaf = iap; |
491 | } | |
492 | } | |
493 | if (iaf == NULL) | |
494 | return; | |
495 | ||
496 | /* Make the packet. */ | |
497 | ifp = iaf->iface; | |
498 | iaf->na_len = sizeof(*na); | |
499 | if (ifp->hwlen != 0) | |
500 | iaf->na_len += (size_t)ROUNDUP8(ifp->hwlen + 2); | |
501 | na = calloc(1, iaf->na_len); | |
502 | if (na == NULL) { | |
503 | logerr(__func__); | |
504 | return; | |
505 | } | |
506 | ||
507 | na->nd_na_type = ND_NEIGHBOR_ADVERT; | |
508 | na->nd_na_flags_reserved = ND_NA_FLAG_OVERRIDE; | |
509 | if (ip6_forwarding(ifp->name) == 1) | |
510 | na->nd_na_flags_reserved |= ND_NA_FLAG_ROUTER; | |
511 | na->nd_na_target = ia->addr; | |
512 | ||
513 | if (ifp->hwlen != 0) { | |
514 | struct nd_opt_hdr *opt; | |
515 | ||
516 | opt = (struct nd_opt_hdr *)(na + 1); | |
517 | opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; | |
518 | opt->nd_opt_len = (uint8_t)((ROUNDUP8(ifp->hwlen + 2)) >> 3); | |
519 | memcpy(opt + 1, ifp->hwaddr, ifp->hwlen); | |
520 | } | |
521 | ||
522 | iaf->na_count = 0; | |
523 | free(iaf->na); | |
524 | iaf->na = na; | |
525 | eloop_timeout_delete(ctx->eloop, ipv6nd_sendadvertisement, iaf); | |
526 | ipv6nd_sendadvertisement(iaf); | |
527 | } | |
528 | ||
cf94e2dd RM |
529 | static void |
530 | ipv6nd_expire(void *arg) | |
2f53bfd4 | 531 | { |
cf94e2dd | 532 | struct interface *ifp = arg; |
2f53bfd4 | 533 | struct ra *rap; |
cf94e2dd RM |
534 | struct ipv6_addr *ia; |
535 | struct timespec now = { .tv_sec = 1 }; | |
2f53bfd4 | 536 | |
cc9d9bf8 | 537 | if (ifp->ctx->ra_routers == NULL) |
aa9fc372 RM |
538 | return; |
539 | ||
cc9d9bf8 | 540 | TAILQ_FOREACH(rap, ifp->ctx->ra_routers, next) { |
cf94e2dd RM |
541 | if (rap->iface == ifp) |
542 | continue; | |
543 | rap->acquired = now; | |
544 | TAILQ_FOREACH(ia, &rap->addrs, next) { | |
545 | ia->acquired = now; | |
2f53bfd4 RM |
546 | } |
547 | } | |
cf94e2dd RM |
548 | ipv6nd_expirera(ifp); |
549 | } | |
550 | ||
551 | void | |
552 | ipv6nd_startexpire(struct interface *ifp) | |
553 | { | |
554 | ||
555 | eloop_timeout_add_sec(ifp->ctx->eloop, RTR_CARRIER_EXPIRE, | |
556 | ipv6nd_expire, ifp); | |
91cd7324 RM |
557 | } |
558 | ||
72c37f5f RM |
559 | static void |
560 | ipv6nd_reachable(struct ra *rap, int flags) | |
561 | { | |
562 | ||
07b28b41 RM |
563 | if (rap->lifetime == 0) |
564 | return; | |
565 | ||
72c37f5f | 566 | if (flags & IPV6ND_REACHABLE) { |
07b28b41 RM |
567 | if (rap->expired == 0) |
568 | return; | |
569 | loginfox("%s: %s is reachable again", | |
570 | rap->iface->name, rap->sfrom); | |
571 | rap->expired = 0; | |
72c37f5f | 572 | } else { |
07b28b41 RM |
573 | if (rap->expired != 0) |
574 | return; | |
575 | logwarnx("%s: %s is unreachable, expiring it", | |
576 | rap->iface->name, rap->sfrom); | |
577 | rap->expired = 1; | |
72c37f5f | 578 | } |
07b28b41 RM |
579 | |
580 | rt_build(rap->iface->ctx, AF_INET6); | |
581 | /* XXX Not really an RA */ | |
582 | script_runreason(rap->iface, "ROUTERADVERT"); | |
72c37f5f RM |
583 | } |
584 | ||
72c37f5f RM |
585 | void |
586 | ipv6nd_neighbour(struct dhcpcd_ctx *ctx, struct in6_addr *addr, int flags) | |
587 | { | |
588 | struct ra *rap; | |
589 | ||
cc9d9bf8 RM |
590 | if (ctx->ra_routers) { |
591 | TAILQ_FOREACH(rap, ctx->ra_routers, next) { | |
362153f5 RM |
592 | if (IN6_ARE_ADDR_EQUAL(&rap->from, addr)) { |
593 | ipv6nd_reachable(rap, flags); | |
594 | break; | |
595 | } | |
72c37f5f RM |
596 | } |
597 | } | |
598 | } | |
a3ee6b23 | 599 | |
edb0ed37 RM |
600 | const struct ipv6_addr * |
601 | ipv6nd_iffindaddr(const struct interface *ifp, const struct in6_addr *addr, | |
c4d7d69a | 602 | unsigned int flags) |
edb0ed37 RM |
603 | { |
604 | struct ra *rap; | |
605 | struct ipv6_addr *ap; | |
606 | ||
cc9d9bf8 | 607 | if (ifp->ctx->ra_routers == NULL) |
edb0ed37 RM |
608 | return NULL; |
609 | ||
cc9d9bf8 | 610 | TAILQ_FOREACH(rap, ifp->ctx->ra_routers, next) { |
edb0ed37 RM |
611 | if (rap->iface != ifp) |
612 | continue; | |
613 | TAILQ_FOREACH(ap, &rap->addrs, next) { | |
5b1f21d1 | 614 | if (ipv6_findaddrmatch(ap, addr, flags)) |
edb0ed37 RM |
615 | return ap; |
616 | } | |
617 | } | |
618 | return NULL; | |
619 | } | |
5b1f21d1 | 620 | |
f3047040 RM |
621 | struct ipv6_addr * |
622 | ipv6nd_findaddr(struct dhcpcd_ctx *ctx, const struct in6_addr *addr, | |
c4d7d69a | 623 | unsigned int flags) |
376e8b80 RM |
624 | { |
625 | struct ra *rap; | |
626 | struct ipv6_addr *ap; | |
627 | ||
cc9d9bf8 | 628 | if (ctx->ra_routers == NULL) |
f3047040 | 629 | return NULL; |
fe6c1b9d | 630 | |
cc9d9bf8 | 631 | TAILQ_FOREACH(rap, ctx->ra_routers, next) { |
376e8b80 | 632 | TAILQ_FOREACH(ap, &rap->addrs, next) { |
5b1f21d1 | 633 | if (ipv6_findaddrmatch(ap, addr, flags)) |
f3047040 | 634 | return ap; |
376e8b80 RM |
635 | } |
636 | } | |
f3047040 | 637 | return NULL; |
376e8b80 RM |
638 | } |
639 | ||
2be15e88 | 640 | static void |
81af2589 | 641 | ipv6nd_removefreedrop_ra(struct ra *rap, int remove_ra, int drop_ra) |
eebe9a18 RM |
642 | { |
643 | ||
4eb7b489 RM |
644 | eloop_timeout_delete(rap->iface->ctx->eloop, NULL, rap->iface); |
645 | eloop_timeout_delete(rap->iface->ctx->eloop, NULL, rap); | |
9a593d97 | 646 | if (remove_ra) |
cc9d9bf8 | 647 | TAILQ_REMOVE(rap->iface->ctx->ra_routers, rap, next); |
81af2589 | 648 | ipv6_freedrop_addrs(&rap->addrs, drop_ra, NULL); |
eebe9a18 | 649 | free(rap->data); |
eebe9a18 RM |
650 | free(rap); |
651 | } | |
652 | ||
f1df29d2 | 653 | static void |
2be15e88 RM |
654 | ipv6nd_freedrop_ra(struct ra *rap, int drop) |
655 | { | |
656 | ||
657 | ipv6nd_removefreedrop_ra(rap, 1, drop); | |
658 | } | |
659 | ||
eebe9a18 | 660 | ssize_t |
e82129a4 | 661 | ipv6nd_free(struct interface *ifp) |
eebe9a18 | 662 | { |
ca15a0aa | 663 | struct rs_state *state; |
eebe9a18 | 664 | struct ra *rap, *ran; |
4eb7b489 | 665 | struct dhcpcd_ctx *ctx; |
eebe9a18 RM |
666 | ssize_t n; |
667 | ||
ca15a0aa | 668 | state = RS_STATE(ifp); |
a9d78def RM |
669 | if (state == NULL) |
670 | return 0; | |
671 | ||
b2edc303 RM |
672 | ctx = ifp->ctx; |
673 | #ifdef __sun | |
674 | eloop_event_delete(ctx->eloop, state->nd_fd); | |
675 | close(state->nd_fd); | |
676 | #endif | |
a9d78def RM |
677 | free(state->rs); |
678 | free(state); | |
679 | ifp->if_data[IF_DATA_IPV6ND] = NULL; | |
eebe9a18 | 680 | n = 0; |
cc9d9bf8 | 681 | TAILQ_FOREACH_SAFE(rap, ifp->ctx->ra_routers, next, ran) { |
eebe9a18 | 682 | if (rap->iface == ifp) { |
e82129a4 | 683 | ipv6nd_free_ra(rap); |
eebe9a18 | 684 | n++; |
91cd7324 | 685 | } |
eebe9a18 | 686 | } |
a9d78def | 687 | |
b2edc303 | 688 | #ifndef __sun |
a9d78def RM |
689 | /* If we don't have any more IPv6 enabled interfaces, |
690 | * close the global socket and release resources */ | |
4eb7b489 | 691 | TAILQ_FOREACH(ifp, ctx->ifaces, next) { |
a9d78def RM |
692 | if (RS_STATE(ifp)) |
693 | break; | |
694 | } | |
695 | if (ifp == NULL) { | |
cc9d9bf8 RM |
696 | if (ctx->nd_fd != -1) { |
697 | eloop_event_delete(ctx->eloop, ctx->nd_fd); | |
698 | close(ctx->nd_fd); | |
699 | ctx->nd_fd = -1; | |
a9d78def | 700 | } |
a9d78def | 701 | } |
b2edc303 | 702 | #endif |
a9d78def | 703 | |
eebe9a18 RM |
704 | return n; |
705 | } | |
706 | ||
707 | static int | |
708 | rtpref(struct ra *rap) | |
709 | { | |
ca15a0aa | 710 | |
eebe9a18 RM |
711 | switch (rap->flags & ND_RA_FLAG_RTPREF_MASK) { |
712 | case ND_RA_FLAG_RTPREF_HIGH: | |
713 | return (RTPREF_HIGH); | |
714 | case ND_RA_FLAG_RTPREF_MEDIUM: | |
715 | case ND_RA_FLAG_RTPREF_RSV: | |
716 | return (RTPREF_MEDIUM); | |
717 | case ND_RA_FLAG_RTPREF_LOW: | |
718 | return (RTPREF_LOW); | |
719 | default: | |
94d1ded9 | 720 | logerrx("rtpref: impossible RA flag %x", rap->flags); |
eebe9a18 RM |
721 | return (RTPREF_INVALID); |
722 | } | |
723 | /* NOTREACHED */ | |
724 | } | |
725 | ||
726 | static void | |
cc9d9bf8 | 727 | add_router(struct dhcpcd_ctx *ctx, struct ra *router) |
eebe9a18 RM |
728 | { |
729 | struct ra *rap; | |
730 | ||
4eb7b489 | 731 | TAILQ_FOREACH(rap, ctx->ra_routers, next) { |
eebe9a18 RM |
732 | if (router->iface->metric < rap->iface->metric || |
733 | (router->iface->metric == rap->iface->metric && | |
734 | rtpref(router) > rtpref(rap))) | |
735 | { | |
736 | TAILQ_INSERT_BEFORE(rap, router, next); | |
737 | return; | |
91cd7324 RM |
738 | } |
739 | } | |
4eb7b489 | 740 | TAILQ_INSERT_TAIL(ctx->ra_routers, router, next); |
91cd7324 RM |
741 | } |
742 | ||
b5b066a5 | 743 | static int |
e82129a4 | 744 | ipv6nd_scriptrun(struct ra *rap) |
a8df1b28 | 745 | { |
e2c4a256 | 746 | int hasdns, hasaddress, pid; |
d5690e93 | 747 | struct ipv6_addr *ap; |
a8df1b28 | 748 | |
e2c4a256 | 749 | hasaddress = 0; |
a8df1b28 | 750 | /* If all addresses have completed DAD run the script */ |
a8df1b28 | 751 | TAILQ_FOREACH(ap, &rap->addrs, next) { |
de67b951 RM |
752 | if ((ap->flags & (IPV6_AF_AUTOCONF | IPV6_AF_ADDED)) == |
753 | (IPV6_AF_AUTOCONF | IPV6_AF_ADDED)) | |
a824f281 | 754 | { |
e2c4a256 | 755 | hasaddress = 1; |
d5690e93 | 756 | if (!(ap->flags & IPV6_AF_DADCOMPLETED) && |
03274c9c RM |
757 | ipv6_iffindaddr(ap->iface, &ap->addr, |
758 | IN6_IFF_TENTATIVE)) | |
d5690e93 RM |
759 | ap->flags |= IPV6_AF_DADCOMPLETED; |
760 | if ((ap->flags & IPV6_AF_DADCOMPLETED) == 0) { | |
0e56d022 | 761 | logdebugx("%s: waiting for Router Advertisement" |
d5690e93 RM |
762 | " DAD to complete", |
763 | rap->iface->name); | |
b5b066a5 | 764 | return 0; |
d5690e93 | 765 | } |
d8194bcd | 766 | } |
a8df1b28 RM |
767 | } |
768 | ||
769 | /* If we don't require RDNSS then set hasdns = 1 so we fork */ | |
770 | if (!(rap->iface->options->options & DHCPCD_IPV6RA_REQRDNSS)) | |
771 | hasdns = 1; | |
772 | else { | |
2be15e88 | 773 | hasdns = rap->hasdns; |
a8df1b28 RM |
774 | } |
775 | ||
776 | script_runreason(rap->iface, "ROUTERADVERT"); | |
e2c4a256 RM |
777 | pid = 0; |
778 | if (hasdns && (hasaddress || | |
779 | !(rap->flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)))) | |
94bec972 | 780 | pid = dhcpcd_daemonise(rap->iface->ctx); |
a8df1b28 RM |
781 | #if 0 |
782 | else if (options & DHCPCD_DAEMONISE && | |
783 | !(options & DHCPCD_DAEMONISED) && new_data) | |
94d1ded9 | 784 | logwarnx("%s: did not fork due to an absent" |
a8df1b28 RM |
785 | " RDNSS option in the RA", |
786 | ifp->name); | |
787 | } | |
788 | #endif | |
e2c4a256 | 789 | return pid; |
a8df1b28 RM |
790 | } |
791 | ||
3ed12ab8 RM |
792 | static void |
793 | ipv6nd_addaddr(void *arg) | |
794 | { | |
795 | struct ipv6_addr *ap = arg; | |
796 | ||
0b3255ac | 797 | ipv6_addaddr(ap, NULL); |
3ed12ab8 RM |
798 | } |
799 | ||
a0011b99 RM |
800 | int |
801 | ipv6nd_dadcompleted(const struct interface *ifp) | |
802 | { | |
803 | const struct ra *rap; | |
804 | const struct ipv6_addr *ap; | |
805 | ||
cc9d9bf8 | 806 | TAILQ_FOREACH(rap, ifp->ctx->ra_routers, next) { |
a0011b99 RM |
807 | if (rap->iface != ifp) |
808 | continue; | |
809 | TAILQ_FOREACH(ap, &rap->addrs, next) { | |
810 | if (ap->flags & IPV6_AF_AUTOCONF && | |
de67b951 | 811 | ap->flags & IPV6_AF_ADDED && |
a0011b99 | 812 | !(ap->flags & IPV6_AF_DADCOMPLETED)) |
de67b951 | 813 | return 0; |
a0011b99 RM |
814 | } |
815 | } | |
816 | return 1; | |
817 | } | |
818 | ||
d8194bcd | 819 | static void |
e82129a4 | 820 | ipv6nd_dadcallback(void *arg) |
d8194bcd | 821 | { |
65ae27ee | 822 | struct ipv6_addr *ia = arg, *rapap; |
d8194bcd RM |
823 | struct interface *ifp; |
824 | struct ra *rap; | |
825 | int wascompleted, found; | |
573d0487 | 826 | struct timespec tv; |
3ed12ab8 RM |
827 | char buf[INET6_ADDRSTRLEN]; |
828 | const char *p; | |
4f5b9dd2 | 829 | int dadcounter; |
d8194bcd | 830 | |
65ae27ee RM |
831 | ifp = ia->iface; |
832 | wascompleted = (ia->flags & IPV6_AF_DADCOMPLETED); | |
833 | ia->flags |= IPV6_AF_DADCOMPLETED; | |
834 | if (ia->flags & IPV6_AF_DUPLICATED) { | |
835 | ia->dadcounter++; | |
836 | logwarnx("%s: DAD detected %s", ifp->name, ia->saddr); | |
d8194bcd | 837 | |
3ed12ab8 RM |
838 | /* Try and make another stable private address. |
839 | * Because ap->dadcounter is always increamented, | |
840 | * a different address is generated. */ | |
841 | /* XXX Cache DAD counter per prefix/id/ssid? */ | |
fd89860f | 842 | if (ifp->options->options & DHCPCD_SLAACPRIVATE) { |
65ae27ee | 843 | if (ia->dadcounter >= IDGEN_RETRIES) { |
94d1ded9 | 844 | logerrx("%s: unable to obtain a" |
fd89860f RM |
845 | " stable private address", |
846 | ifp->name); | |
847 | goto try_script; | |
848 | } | |
9efdc92f | 849 | loginfox("%s: deleting address %s", |
65ae27ee RM |
850 | ifp->name, ia->saddr); |
851 | if (if_address6(RTM_DELADDR, ia) == -1 && | |
3ed12ab8 | 852 | errno != EADDRNOTAVAIL && errno != ENXIO) |
94d1ded9 | 853 | logerr(__func__); |
65ae27ee RM |
854 | dadcounter = ia->dadcounter; |
855 | if (ipv6_makestableprivate(&ia->addr, | |
856 | &ia->prefix, ia->prefix_len, | |
4f5b9dd2 | 857 | ifp, &dadcounter) == -1) |
3ed12ab8 | 858 | { |
94d1ded9 | 859 | logerr("ipv6_makestableprivate"); |
3ed12ab8 RM |
860 | return; |
861 | } | |
65ae27ee RM |
862 | ia->dadcounter = dadcounter; |
863 | ia->flags &= ~(IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED); | |
864 | ia->flags |= IPV6_AF_NEW; | |
865 | p = inet_ntop(AF_INET6, &ia->addr, buf, sizeof(buf)); | |
3ed12ab8 | 866 | if (p) |
65ae27ee RM |
867 | snprintf(ia->saddr, |
868 | sizeof(ia->saddr), | |
3ed12ab8 | 869 | "%s/%d", |
65ae27ee | 870 | p, ia->prefix_len); |
3ed12ab8 | 871 | else |
65ae27ee | 872 | ia->saddr[0] = '\0'; |
3ed12ab8 | 873 | tv.tv_sec = 0; |
573d0487 RM |
874 | tv.tv_nsec = (suseconds_t) |
875 | arc4random_uniform(IDGEN_DELAY * NSEC_PER_SEC); | |
876 | timespecnorm(&tv); | |
3ed12ab8 | 877 | eloop_timeout_add_tv(ifp->ctx->eloop, &tv, |
65ae27ee | 878 | ipv6nd_addaddr, ia); |
3ed12ab8 RM |
879 | return; |
880 | } | |
881 | } | |
d8194bcd | 882 | |
fd89860f | 883 | try_script: |
3ed12ab8 | 884 | if (!wascompleted) { |
cc9d9bf8 | 885 | TAILQ_FOREACH(rap, ifp->ctx->ra_routers, next) { |
d8194bcd RM |
886 | if (rap->iface != ifp) |
887 | continue; | |
888 | wascompleted = 1; | |
e92ca600 | 889 | found = 0; |
d8194bcd | 890 | TAILQ_FOREACH(rapap, &rap->addrs, next) { |
a824f281 | 891 | if (rapap->flags & IPV6_AF_AUTOCONF && |
de67b951 | 892 | rapap->flags & IPV6_AF_ADDED && |
a824f281 RM |
893 | (rapap->flags & IPV6_AF_DADCOMPLETED) == 0) |
894 | { | |
d8194bcd RM |
895 | wascompleted = 0; |
896 | break; | |
897 | } | |
65ae27ee | 898 | if (rapap == ia) |
d8194bcd RM |
899 | found = 1; |
900 | } | |
901 | ||
4f422dd3 | 902 | if (wascompleted && found) { |
0e56d022 | 903 | logdebugx("%s: Router Advertisement DAD " |
94d1ded9 | 904 | "completed", |
d8194bcd | 905 | rap->iface->name); |
b5b066a5 RM |
906 | if (ipv6nd_scriptrun(rap)) |
907 | return; | |
d8194bcd RM |
908 | } |
909 | } | |
cd09e583 | 910 | ipv6nd_advertise(ia); |
d8194bcd RM |
911 | } |
912 | } | |
913 | ||
6a765a4f RM |
914 | #ifndef DHCP6 |
915 | /* If DHCPv6 is compiled out, supply a shim to provide an error message | |
916 | * if IPv6RA requests DHCPv6. */ | |
a1b1f0a8 RM |
917 | enum DH6S { |
918 | DH6S_REQUEST, | |
919 | DH6S_INFORM, | |
920 | }; | |
6a765a4f RM |
921 | static int |
922 | dhcp6_start(__unused struct interface *ifp, __unused enum DH6S init_state) | |
923 | { | |
924 | ||
925 | errno = ENOTSUP; | |
926 | return -1; | |
927 | } | |
928 | #endif | |
929 | ||
aae24feb | 930 | static void |
5fed9d43 RM |
931 | ipv6nd_handlera(struct dhcpcd_ctx *ctx, |
932 | const struct sockaddr_in6 *from, const char *sfrom, | |
933 | struct interface *ifp, struct icmp6_hdr *icp, size_t len, int hoplimit) | |
91cd7324 | 934 | { |
2be15e88 | 935 | size_t i, olen; |
7be4b9b3 | 936 | struct nd_router_advert *nd_ra; |
55a59017 RM |
937 | struct nd_opt_hdr ndo; |
938 | struct nd_opt_prefix_info pi; | |
939 | struct nd_opt_mtu mtu; | |
940 | struct nd_opt_rdnss rdnss; | |
2be15e88 | 941 | uint8_t *p; |
91cd7324 | 942 | struct ra *rap; |
7878d124 | 943 | struct in6_addr pi_prefix; |
eebe9a18 | 944 | struct ipv6_addr *ap; |
2be15e88 | 945 | struct dhcp_opt *dho; |
2aca3a18 | 946 | bool new_rap, new_data; |
c15437c1 | 947 | uint32_t old_lifetime; |
94d1ded9 | 948 | __printflike(1, 2) void (*logfunc)(const char *, ...); |
727cd92a RM |
949 | #ifdef IPV6_MANAGETEMPADDR |
950 | uint8_t new_ap; | |
951 | #endif | |
91cd7324 | 952 | |
a708c891 RM |
953 | if (ifp == NULL) { |
954 | #ifdef DEBUG_RS | |
5fed9d43 | 955 | logdebugx("RA for unexpected interface from %s", sfrom); |
a708c891 RM |
956 | #endif |
957 | return; | |
958 | } | |
959 | ||
34457fe6 | 960 | if (len < sizeof(struct nd_router_advert)) { |
5fed9d43 | 961 | logerrx("IPv6 RA packet too short from %s", sfrom); |
91cd7324 RM |
962 | return; |
963 | } | |
964 | ||
a708c891 RM |
965 | /* RFC 4861 7.1.2 */ |
966 | if (hoplimit != 255) { | |
5fed9d43 | 967 | logerrx("invalid hoplimit(%d) in RA from %s", hoplimit, sfrom); |
91cd7324 RM |
968 | return; |
969 | } | |
5fed9d43 RM |
970 | if (!IN6_IS_ADDR_LINKLOCAL(&from->sin6_addr)) { |
971 | logerrx("RA from non local address %s", sfrom); | |
4c6a8bec RM |
972 | return; |
973 | } | |
a708c891 | 974 | |
4c6a8bec RM |
975 | if (!(ifp->options->options & DHCPCD_IPV6RS)) { |
976 | #ifdef DEBUG_RS | |
5fed9d43 | 977 | logerrx("%s: unexpected RA from %s", ifp->name, sfrom); |
d7555c12 | 978 | #endif |
91cd7324 RM |
979 | return; |
980 | } | |
0e906716 | 981 | |
e7a30a46 | 982 | /* We could receive a RA before we sent a RS*/ |
0e906716 RM |
983 | if (ipv6_linklocal(ifp) == NULL) { |
984 | #ifdef DEBUG_RS | |
0e56d022 | 985 | logdebugx("%s: received RA from %s (no link-local)", |
5fed9d43 | 986 | ifp->name, sfrom); |
0e906716 RM |
987 | #endif |
988 | return; | |
989 | } | |
990 | ||
5fed9d43 | 991 | if (ipv6_iffindaddr(ifp, &from->sin6_addr, IN6_IFF_TENTATIVE)) { |
0e56d022 | 992 | logdebugx("%s: ignoring RA from ourself %s", |
5fed9d43 | 993 | ifp->name, sfrom); |
29211f25 RM |
994 | return; |
995 | } | |
996 | ||
4eb7b489 | 997 | TAILQ_FOREACH(rap, ctx->ra_routers, next) { |
fe292175 | 998 | if (ifp == rap->iface && |
5fed9d43 | 999 | IN6_ARE_ADDR_EQUAL(&rap->from, &from->sin6_addr)) |
91cd7324 RM |
1000 | break; |
1001 | } | |
46caaa5e | 1002 | |
e42bbc9b | 1003 | nd_ra = (struct nd_router_advert *)icp; |
e42bbc9b | 1004 | |
46caaa5e RM |
1005 | /* We don't want to spam the log with the fact we got an RA every |
1006 | * 30 seconds or so, so only spam the log if it's different. */ | |
ee70f4ab | 1007 | if (rap == NULL || (rap->data_len != len || |
46caaa5e RM |
1008 | memcmp(rap->data, (unsigned char *)icp, rap->data_len) != 0)) |
1009 | { | |
1010 | if (rap) { | |
1011 | free(rap->data); | |
1012 | rap->data_len = 0; | |
1013 | } | |
2aca3a18 | 1014 | new_data = true; |
d7555c12 | 1015 | } else |
2aca3a18 | 1016 | new_data = false; |
91cd7324 | 1017 | if (rap == NULL) { |
10e17e3f RM |
1018 | rap = calloc(1, sizeof(*rap)); |
1019 | if (rap == NULL) { | |
94d1ded9 | 1020 | logerr(__func__); |
10e17e3f RM |
1021 | return; |
1022 | } | |
eebe9a18 | 1023 | rap->iface = ifp; |
5fed9d43 RM |
1024 | rap->from = from->sin6_addr; |
1025 | strlcpy(rap->sfrom, sfrom, sizeof(rap->sfrom)); | |
eebe9a18 | 1026 | TAILQ_INIT(&rap->addrs); |
2aca3a18 | 1027 | new_rap = true; |
eebe9a18 | 1028 | } else |
2aca3a18 | 1029 | new_rap = false; |
46caaa5e | 1030 | if (rap->data_len == 0) { |
28382337 RM |
1031 | rap->data = malloc(len); |
1032 | if (rap->data == NULL) { | |
94d1ded9 | 1033 | logerr(__func__); |
28382337 RM |
1034 | if (new_rap) |
1035 | free(rap); | |
1036 | return; | |
1037 | } | |
46caaa5e RM |
1038 | memcpy(rap->data, icp, len); |
1039 | rap->data_len = len; | |
91cd7324 RM |
1040 | } |
1041 | ||
19e75b95 RM |
1042 | /* We could change the debug level based on new_data, but some |
1043 | * routers like to decrease the advertised valid and preferred times | |
1044 | * in accordance with the own prefix times which would result in too | |
1045 | * much needless log spam. */ | |
9efdc92f | 1046 | logfunc = new_rap ? loginfox : logdebugx, |
5fed9d43 | 1047 | logfunc("%s: Router Advertisement from %s", ifp->name, rap->sfrom); |
19e75b95 | 1048 | |
f5c3ca19 | 1049 | clock_gettime(CLOCK_MONOTONIC, &rap->acquired); |
eebe9a18 | 1050 | rap->flags = nd_ra->nd_ra_flags_reserved; |
c15437c1 | 1051 | old_lifetime = rap->lifetime; |
7be4b9b3 | 1052 | rap->lifetime = ntohs(nd_ra->nd_ra_router_lifetime); |
c15437c1 RM |
1053 | if (!new_rap && rap->lifetime == 0 && old_lifetime != 0) |
1054 | logwarnx("%s: %s: no longer a default router", | |
1055 | ifp->name, rap->sfrom); | |
ea112ab2 RM |
1056 | if (nd_ra->nd_ra_reachable) { |
1057 | rap->reachable = ntohl(nd_ra->nd_ra_reachable); | |
1058 | if (rap->reachable > MAX_REACHABLE_TIME) | |
1059 | rap->reachable = 0; | |
1060 | } | |
cd09e583 RM |
1061 | if (nd_ra->nd_ra_retransmit) { |
1062 | struct rs_state *state = RS_STATE(ifp); | |
1063 | ||
1064 | state->retrans = rap->retrans = ntohl(nd_ra->nd_ra_retransmit); | |
1065 | } | |
b88df421 RM |
1066 | if (rap->lifetime) |
1067 | rap->expired = 0; | |
2be15e88 | 1068 | rap->hasdns = 0; |
91cd7324 | 1069 | |
b4c49a9f | 1070 | #ifdef IPV6_AF_TEMPORARY |
a15bffa6 | 1071 | ipv6_markaddrsstale(ifp, IPV6_AF_TEMPORARY); |
b4c49a9f | 1072 | #endif |
9adc479c RM |
1073 | TAILQ_FOREACH(ap, &rap->addrs, next) { |
1074 | ap->flags |= IPV6_AF_STALE; | |
1075 | } | |
1076 | ||
91cd7324 RM |
1077 | len -= sizeof(struct nd_router_advert); |
1078 | p = ((uint8_t *)icp) + sizeof(struct nd_router_advert); | |
8fc52ced | 1079 | for (; len > 0; p += olen, len -= olen) { |
55a59017 | 1080 | if (len < sizeof(ndo)) { |
94d1ded9 | 1081 | logerrx("%s: short option", ifp->name); |
91cd7324 RM |
1082 | break; |
1083 | } | |
55a59017 RM |
1084 | memcpy(&ndo, p, sizeof(ndo)); |
1085 | olen = (size_t)ndo.nd_opt_len * 8; | |
91cd7324 | 1086 | if (olen == 0) { |
94d1ded9 | 1087 | logerrx("%s: zero length option", ifp->name); |
91cd7324 RM |
1088 | break; |
1089 | } | |
1090 | if (olen > len) { | |
94d1ded9 | 1091 | logerrx("%s: option length exceeds message", |
03274c9c | 1092 | ifp->name); |
91cd7324 RM |
1093 | break; |
1094 | } | |
1095 | ||
2be15e88 | 1096 | if (has_option_mask(ifp->options->rejectmasknd, |
55a59017 | 1097 | ndo.nd_opt_type)) |
2be15e88 | 1098 | { |
cc9d9bf8 RM |
1099 | for (i = 0, dho = ctx->nd_opts; |
1100 | i < ctx->nd_opts_len; | |
2be15e88 RM |
1101 | i++, dho++) |
1102 | { | |
55a59017 | 1103 | if (dho->option == ndo.nd_opt_type) |
2be15e88 RM |
1104 | break; |
1105 | } | |
a708c891 | 1106 | if (dho != NULL) |
94d1ded9 | 1107 | logwarnx("%s: reject RA (option %s) from %s", |
5fed9d43 | 1108 | ifp->name, dho->var, rap->sfrom); |
2be15e88 | 1109 | else |
94d1ded9 | 1110 | logwarnx("%s: reject RA (option %d) from %s", |
5fed9d43 | 1111 | ifp->name, ndo.nd_opt_type, rap->sfrom); |
2be15e88 RM |
1112 | if (new_rap) |
1113 | ipv6nd_removefreedrop_ra(rap, 0, 0); | |
1114 | else | |
1115 | ipv6nd_free_ra(rap); | |
1116 | return; | |
1117 | } | |
1118 | ||
55a59017 | 1119 | if (has_option_mask(ifp->options->nomasknd, ndo.nd_opt_type)) |
2be15e88 RM |
1120 | continue; |
1121 | ||
55a59017 | 1122 | switch (ndo.nd_opt_type) { |
91cd7324 | 1123 | case ND_OPT_PREFIX_INFORMATION: |
0e56d022 | 1124 | logfunc = new_data ? logerrx : logdebugx; |
55a59017 | 1125 | if (ndo.nd_opt_len != 4) { |
94d1ded9 | 1126 | logfunc("%s: invalid option len for prefix", |
91cd7324 | 1127 | ifp->name); |
c448a53a | 1128 | continue; |
91cd7324 | 1129 | } |
55a59017 RM |
1130 | memcpy(&pi, p, sizeof(pi)); |
1131 | if (pi.nd_opt_pi_prefix_len > 128) { | |
94d1ded9 | 1132 | logfunc("%s: invalid prefix len", ifp->name); |
c448a53a | 1133 | continue; |
91cd7324 | 1134 | } |
7878d124 | 1135 | /* nd_opt_pi_prefix is not aligned. */ |
03274c9c RM |
1136 | memcpy(&pi_prefix, &pi.nd_opt_pi_prefix, |
1137 | sizeof(pi_prefix)); | |
7878d124 RM |
1138 | if (IN6_IS_ADDR_MULTICAST(&pi_prefix) || |
1139 | IN6_IS_ADDR_LINKLOCAL(&pi_prefix)) | |
91cd7324 | 1140 | { |
94d1ded9 | 1141 | logfunc("%s: invalid prefix in RA", ifp->name); |
c448a53a | 1142 | continue; |
91cd7324 | 1143 | } |
55a59017 RM |
1144 | if (ntohl(pi.nd_opt_pi_preferred_time) > |
1145 | ntohl(pi.nd_opt_pi_valid_time)) | |
e54dee19 | 1146 | { |
94d1ded9 | 1147 | logfunc("%s: pltime > vltime", ifp->name); |
c448a53a | 1148 | continue; |
e54dee19 | 1149 | } |
eebe9a18 | 1150 | TAILQ_FOREACH(ap, &rap->addrs, next) |
55a59017 | 1151 | if (ap->prefix_len ==pi.nd_opt_pi_prefix_len && |
7878d124 | 1152 | IN6_ARE_ADDR_EQUAL(&ap->prefix, &pi_prefix)) |
eebe9a18 RM |
1153 | break; |
1154 | if (ap == NULL) { | |
c4d7d69a | 1155 | unsigned int flags; |
61564d34 | 1156 | |
61564d34 | 1157 | flags = IPV6_AF_RAPFX; |
55a59017 | 1158 | if (pi.nd_opt_pi_flags_reserved & |
62f12387 | 1159 | ND_OPT_PI_FLAG_AUTO && |
61564d34 | 1160 | rap->iface->options->options & |
62f12387 | 1161 | DHCPCD_IPV6RA_AUTOCONF) |
61564d34 RM |
1162 | flags |= IPV6_AF_AUTOCONF; |
1163 | ||
1164 | ap = ipv6_newaddr(rap->iface, | |
1165 | &pi_prefix, pi.nd_opt_pi_prefix_len, flags); | |
1166 | if (ap == NULL) | |
1167 | break; | |
1168 | ap->prefix = pi_prefix; | |
d292d54e RM |
1169 | if (flags & IPV6_AF_AUTOCONF) |
1170 | ap->dadcallback = ipv6nd_dadcallback; | |
f5c3ca19 | 1171 | ap->created = ap->acquired = rap->acquired; |
eebe9a18 | 1172 | TAILQ_INSERT_TAIL(&rap->addrs, ap, next); |
a1f7b32c | 1173 | |
727cd92a | 1174 | #ifdef IPV6_MANAGETEMPADDR |
a1f7b32c RM |
1175 | /* New address to dhcpcd RA handling. |
1176 | * If the address already exists and a valid | |
1177 | * temporary address also exists then | |
1178 | * extend the existing one rather than | |
1179 | * create a new one */ | |
d292d54e RM |
1180 | if (flags & IPV6_AF_AUTOCONF && |
1181 | ipv6_iffindaddr(ifp, &ap->addr, | |
5119f4f3 | 1182 | IN6_IFF_NOTUSEABLE) && |
a1f7b32c RM |
1183 | ipv6_settemptime(ap, 0)) |
1184 | new_ap = 0; | |
1185 | else | |
1186 | new_ap = 1; | |
727cd92a | 1187 | #endif |
a1f7b32c | 1188 | } else { |
727cd92a | 1189 | #ifdef IPV6_MANAGETEMPADDR |
a1f7b32c | 1190 | new_ap = 0; |
727cd92a | 1191 | #endif |
9adc479c | 1192 | ap->flags &= ~IPV6_AF_STALE; |
f5c3ca19 | 1193 | ap->acquired = rap->acquired; |
a1f7b32c | 1194 | } |
55a59017 | 1195 | if (pi.nd_opt_pi_flags_reserved & |
cd3612e5 | 1196 | ND_OPT_PI_FLAG_ONLINK) |
46b8a6b7 | 1197 | ap->flags |= IPV6_AF_ONLINK; |
eebe9a18 | 1198 | ap->prefix_vltime = |
55a59017 | 1199 | ntohl(pi.nd_opt_pi_valid_time); |
eebe9a18 | 1200 | ap->prefix_pltime = |
55a59017 | 1201 | ntohl(pi.nd_opt_pi_preferred_time); |
a1f7b32c | 1202 | |
727cd92a | 1203 | #ifdef IPV6_MANAGETEMPADDR |
a1f7b32c RM |
1204 | /* RFC4941 Section 3.3.3 */ |
1205 | if (ap->flags & IPV6_AF_AUTOCONF && | |
a1f7b32c RM |
1206 | ip6_use_tempaddr(ap->iface->name)) |
1207 | { | |
1208 | if (!new_ap) { | |
1209 | if (ipv6_settemptime(ap, 1) == NULL) | |
1210 | new_ap = 1; | |
1211 | } | |
1212 | if (new_ap && ap->prefix_pltime) { | |
1213 | if (ipv6_createtempaddr(ap, | |
1214 | &ap->acquired) == NULL) | |
94d1ded9 | 1215 | logerr("ipv6_createtempaddr"); |
a1f7b32c RM |
1216 | } |
1217 | } | |
727cd92a | 1218 | #endif |
91cd7324 RM |
1219 | break; |
1220 | ||
1221 | case ND_OPT_MTU: | |
19005560 RM |
1222 | if (len < sizeof(mtu)) { |
1223 | logerrx("%s: short MTU option", ifp->name); | |
1224 | break; | |
1225 | } | |
55a59017 RM |
1226 | memcpy(&mtu, p, sizeof(mtu)); |
1227 | mtu.nd_opt_mtu_mtu = ntohl(mtu.nd_opt_mtu_mtu); | |
1228 | if (mtu.nd_opt_mtu_mtu < IPV6_MMTU) { | |
94d1ded9 | 1229 | logerrx("%s: invalid MTU %d", |
55a59017 | 1230 | ifp->name, mtu.nd_opt_mtu_mtu); |
eebe9a18 RM |
1231 | break; |
1232 | } | |
55a59017 | 1233 | rap->mtu = mtu.nd_opt_mtu_mtu; |
91cd7324 RM |
1234 | break; |
1235 | ||
1236 | case ND_OPT_RDNSS: | |
19005560 RM |
1237 | if (len < sizeof(rdnss)) { |
1238 | logerrx("%s: short RDNSS option", ifp->name); | |
1239 | break; | |
1240 | } | |
55a59017 RM |
1241 | memcpy(&rdnss, p, sizeof(rdnss)); |
1242 | if (rdnss.nd_opt_rdnss_lifetime && | |
1243 | rdnss.nd_opt_rdnss_len > 1) | |
2be15e88 | 1244 | rap->hasdns = 1; |
55a59017 | 1245 | break; |
17b0dbad RM |
1246 | default: |
1247 | continue; | |
91cd7324 | 1248 | } |
2be15e88 | 1249 | } |
91cd7324 | 1250 | |
cc9d9bf8 RM |
1251 | for (i = 0, dho = ctx->nd_opts; |
1252 | i < ctx->nd_opts_len; | |
2be15e88 RM |
1253 | i++, dho++) |
1254 | { | |
1255 | if (has_option_mask(ifp->options->requiremasknd, | |
1256 | dho->option)) | |
1257 | { | |
94d1ded9 | 1258 | logwarnx("%s: reject RA (no option %s) from %s", |
5fed9d43 | 1259 | ifp->name, dho->var, rap->sfrom); |
2be15e88 RM |
1260 | if (new_rap) |
1261 | ipv6nd_removefreedrop_ra(rap, 0, 0); | |
1262 | else | |
1263 | ipv6nd_free_ra(rap); | |
1264 | return; | |
fd3e7f65 | 1265 | } |
91cd7324 RM |
1266 | } |
1267 | ||
eebe9a18 | 1268 | if (new_rap) |
cc9d9bf8 | 1269 | add_router(ifp->ctx, rap); |
2be15e88 | 1270 | |
4eb7b489 | 1271 | if (ifp->ctx->options & DHCPCD_TEST) { |
294eff4d | 1272 | script_runreason(ifp, "TEST"); |
d7555c12 | 1273 | goto handle_flag; |
b88df421 | 1274 | } |
7529fdf1 | 1275 | ipv6_addaddrs(&rap->addrs); |
727cd92a | 1276 | #ifdef IPV6_MANAGETEMPADDR |
f5c3ca19 | 1277 | ipv6_addtempaddrs(ifp, &rap->acquired); |
727cd92a | 1278 | #endif |
a19fe492 | 1279 | |
9aa11487 | 1280 | rt_build(ifp->ctx, AF_INET6); |
4f422dd3 RM |
1281 | if (ipv6nd_scriptrun(rap)) |
1282 | return; | |
61dd6cf9 | 1283 | |
4eb7b489 RM |
1284 | eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); |
1285 | eloop_timeout_delete(ifp->ctx->eloop, NULL, rap); /* reachable timer */ | |
eebe9a18 | 1286 | |
d7555c12 | 1287 | handle_flag: |
f6794c78 RM |
1288 | if (!(ifp->options->options & DHCPCD_DHCP6)) |
1289 | goto nodhcp6; | |
6a765a4f RM |
1290 | /* Only log a DHCPv6 start error if compiled in or debugging is enabled. */ |
1291 | #ifdef DHCP6 | |
94d1ded9 | 1292 | #define LOG_DHCP6 logerr |
6a765a4f | 1293 | #else |
94d1ded9 | 1294 | #define LOG_DHCP6 logdebug |
6a765a4f | 1295 | #endif |
d7555c12 | 1296 | if (rap->flags & ND_RA_FLAG_MANAGED) { |
385479d2 | 1297 | if (new_data && dhcp6_start(ifp, DH6S_REQUEST) == -1) |
94d1ded9 | 1298 | LOG_DHCP6("dhcp6_start: %s", ifp->name); |
d7555c12 | 1299 | } else if (rap->flags & ND_RA_FLAG_OTHER) { |
4f422dd3 | 1300 | if (new_data && dhcp6_start(ifp, DH6S_INFORM) == -1) |
94d1ded9 | 1301 | LOG_DHCP6("dhcp6_start: %s", ifp->name); |
d7555c12 | 1302 | } else { |
a1b1f0a8 | 1303 | #ifdef DHCP6 |
4f422dd3 | 1304 | if (new_data) |
0e56d022 | 1305 | logdebugx("%s: No DHCPv6 instruction in RA", ifp->name); |
a1b1f0a8 | 1306 | #endif |
f6794c78 | 1307 | nodhcp6: |
4eb7b489 RM |
1308 | if (ifp->ctx->options & DHCPCD_TEST) { |
1309 | eloop_exit(ifp->ctx->eloop, EXIT_SUCCESS); | |
a9d78def RM |
1310 | return; |
1311 | } | |
d7555c12 | 1312 | } |
35308011 RM |
1313 | |
1314 | /* Expire should be called last as the rap object could be destroyed */ | |
e82129a4 | 1315 | ipv6nd_expirera(ifp); |
eebe9a18 RM |
1316 | } |
1317 | ||
1318 | int | |
047235d7 | 1319 | ipv6nd_hasra(const struct interface *ifp) |
eebe9a18 RM |
1320 | { |
1321 | const struct ra *rap; | |
1322 | ||
cc9d9bf8 RM |
1323 | if (ifp->ctx->ra_routers) { |
1324 | TAILQ_FOREACH(rap, ifp->ctx->ra_routers, next) | |
047235d7 | 1325 | if (rap->iface == ifp && !rap->expired) |
2433e54d RM |
1326 | return 1; |
1327 | } | |
eebe9a18 | 1328 | return 0; |
91cd7324 RM |
1329 | } |
1330 | ||
047235d7 RM |
1331 | int |
1332 | ipv6nd_hasradhcp(const struct interface *ifp) | |
1333 | { | |
1334 | const struct ra *rap; | |
1335 | ||
cc9d9bf8 RM |
1336 | if (ifp->ctx->ra_routers) { |
1337 | TAILQ_FOREACH(rap, ifp->ctx->ra_routers, next) { | |
047235d7 RM |
1338 | if (rap->iface == ifp && |
1339 | !rap->expired && | |
1340 | (rap->flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER))) | |
1341 | return 1; | |
1342 | } | |
1343 | } | |
1344 | return 0; | |
1345 | } | |
1346 | ||
2be15e88 RM |
1347 | static const uint8_t * |
1348 | ipv6nd_getoption(struct dhcpcd_ctx *ctx, | |
1349 | size_t *os, unsigned int *code, size_t *len, | |
1350 | const uint8_t *od, size_t ol, struct dhcp_opt **oopt) | |
1351 | { | |
55a59017 | 1352 | struct nd_opt_hdr ndo; |
2be15e88 RM |
1353 | size_t i; |
1354 | struct dhcp_opt *opt; | |
1355 | ||
1356 | if (od) { | |
55a59017 | 1357 | *os = sizeof(ndo); |
2be15e88 RM |
1358 | if (ol < *os) { |
1359 | errno = EINVAL; | |
1360 | return NULL; | |
1361 | } | |
55a59017 | 1362 | memcpy(&ndo, od, sizeof(ndo)); |
81e9fc13 | 1363 | i = (size_t)(ndo.nd_opt_len * 8); |
55a59017 | 1364 | if (i > ol) { |
2be15e88 RM |
1365 | errno = EINVAL; |
1366 | return NULL; | |
1367 | } | |
55a59017 RM |
1368 | *len = i; |
1369 | *code = ndo.nd_opt_type; | |
1370 | } | |
2be15e88 RM |
1371 | |
1372 | for (i = 0, opt = ctx->nd_opts; | |
1373 | i < ctx->nd_opts_len; i++, opt++) | |
1374 | { | |
1375 | if (opt->option == *code) { | |
1376 | *oopt = opt; | |
1377 | break; | |
1378 | } | |
1379 | } | |
1380 | ||
55a59017 RM |
1381 | if (od) |
1382 | return od + sizeof(ndo); | |
2be15e88 RM |
1383 | return NULL; |
1384 | } | |
1385 | ||
91cd7324 | 1386 | ssize_t |
e82129a4 | 1387 | ipv6nd_env(char **env, const char *prefix, const struct interface *ifp) |
91cd7324 | 1388 | { |
55a59017 | 1389 | size_t i, j, n, len, olen; |
2be15e88 RM |
1390 | struct ra *rap; |
1391 | char ndprefix[32], abuf[24]; | |
1392 | struct dhcp_opt *opt; | |
55a59017 RM |
1393 | uint8_t *p; |
1394 | struct nd_opt_hdr ndo; | |
2be15e88 | 1395 | struct ipv6_addr *ia; |
f5c3ca19 | 1396 | struct timespec now; |
eebe9a18 | 1397 | |
f5c3ca19 | 1398 | clock_gettime(CLOCK_MONOTONIC, &now); |
2be15e88 | 1399 | i = n = 0; |
cc9d9bf8 | 1400 | TAILQ_FOREACH(rap, ifp->ctx->ra_routers, next) { |
eebe9a18 RM |
1401 | if (rap->iface != ifp) |
1402 | continue; | |
0d593c43 | 1403 | i++; |
2be15e88 RM |
1404 | if (prefix != NULL) |
1405 | snprintf(ndprefix, sizeof(ndprefix), | |
1406 | "%s_nd%zu", prefix, i); | |
1407 | else | |
1408 | snprintf(ndprefix, sizeof(ndprefix), | |
1409 | "nd%zu", i); | |
1410 | if (env) | |
03274c9c | 1411 | setvar(&env[n], ndprefix, "from", rap->sfrom); |
2be15e88 | 1412 | n++; |
f5c3ca19 | 1413 | if (env) |
03274c9c RM |
1414 | setvard(&env[n], ndprefix, "acquired", |
1415 | (size_t)rap->acquired.tv_sec); | |
f5c3ca19 RM |
1416 | n++; |
1417 | if (env) | |
03274c9c | 1418 | setvard(&env[n], ndprefix, "now", (size_t)now.tv_sec); |
f5c3ca19 | 1419 | n++; |
2be15e88 RM |
1420 | |
1421 | /* Zero our indexes */ | |
91cd7324 | 1422 | if (env) { |
2be15e88 RM |
1423 | for (j = 0, opt = rap->iface->ctx->nd_opts; |
1424 | j < rap->iface->ctx->nd_opts_len; | |
1425 | j++, opt++) | |
1426 | dhcp_zero_index(opt); | |
1427 | for (j = 0, opt = rap->iface->options->nd_override; | |
1428 | j < rap->iface->options->nd_override_len; | |
1429 | j++, opt++) | |
1430 | dhcp_zero_index(opt); | |
91cd7324 | 1431 | } |
449df9c8 | 1432 | |
2be15e88 RM |
1433 | /* Unlike DHCP, ND6 options *may* occur more than once. |
1434 | * There is also no provision for option concatenation | |
1435 | * unlike DHCP. */ | |
55a59017 RM |
1436 | len = rap->data_len - sizeof(struct nd_router_advert); |
1437 | for (p = rap->data + sizeof(struct nd_router_advert); | |
1438 | len >= sizeof(ndo); | |
1439 | p += olen, len -= olen) | |
2be15e88 | 1440 | { |
55a59017 | 1441 | memcpy(&ndo, p, sizeof(ndo)); |
81e9fc13 | 1442 | olen = (size_t)(ndo.nd_opt_len * 8); |
55a59017 | 1443 | if (olen > len) { |
2be15e88 | 1444 | errno = EINVAL; |
91cd7324 | 1445 | break; |
91cd7324 | 1446 | } |
2be15e88 | 1447 | if (has_option_mask(rap->iface->options->nomasknd, |
55a59017 | 1448 | ndo.nd_opt_type)) |
28382337 | 1449 | continue; |
2be15e88 RM |
1450 | for (j = 0, opt = rap->iface->options->nd_override; |
1451 | j < rap->iface->options->nd_override_len; | |
1452 | j++, opt++) | |
55a59017 | 1453 | if (opt->option == ndo.nd_opt_type) |
2be15e88 RM |
1454 | break; |
1455 | if (j == rap->iface->options->nd_override_len) { | |
1456 | for (j = 0, opt = rap->iface->ctx->nd_opts; | |
1457 | j < rap->iface->ctx->nd_opts_len; | |
1458 | j++, opt++) | |
55a59017 | 1459 | if (opt->option == ndo.nd_opt_type) |
2be15e88 RM |
1460 | break; |
1461 | if (j == rap->iface->ctx->nd_opts_len) | |
1462 | opt = NULL; | |
1463 | } | |
1464 | if (opt) { | |
1465 | n += dhcp_envoption(rap->iface->ctx, | |
1466 | env == NULL ? NULL : &env[n], | |
1467 | ndprefix, rap->iface->name, | |
1468 | opt, ipv6nd_getoption, | |
55a59017 | 1469 | p + sizeof(ndo), olen - sizeof(ndo)); |
d4e41f4b | 1470 | } |
2be15e88 RM |
1471 | } |
1472 | ||
1473 | /* We need to output the addresses we actually made | |
1474 | * from the prefix information options as well. */ | |
1475 | j = 0; | |
1476 | TAILQ_FOREACH(ia, &rap->addrs, next) { | |
19005560 | 1477 | if (!(ia->flags & IPV6_AF_AUTOCONF) || |
f5c3ca19 | 1478 | #ifdef IPV6_AF_TEMPORARY |
19005560 | 1479 | ia->flags & IPV6_AF_TEMPORARY || |
f5c3ca19 | 1480 | #endif |
19005560 RM |
1481 | !(ia->flags & IPV6_AF_ADDED) || |
1482 | ia->prefix_vltime == 0) | |
2be15e88 RM |
1483 | continue; |
1484 | j++; | |
d4e41f4b | 1485 | if (env) { |
2be15e88 | 1486 | snprintf(abuf, sizeof(abuf), "addr%zu", j); |
03274c9c | 1487 | setvar(&env[n], ndprefix, abuf, ia->saddr); |
d4e41f4b | 1488 | } |
2be15e88 | 1489 | n++; |
91cd7324 RM |
1490 | } |
1491 | } | |
2be15e88 | 1492 | return (ssize_t)n; |
91cd7324 RM |
1493 | } |
1494 | ||
a8df1b28 | 1495 | void |
90149620 | 1496 | ipv6nd_handleifa(int cmd, struct ipv6_addr *addr, pid_t pid) |
a8df1b28 RM |
1497 | { |
1498 | struct ra *rap; | |
a8df1b28 | 1499 | |
d3826f33 RM |
1500 | /* IPv6 init may not have happened yet if we are learning |
1501 | * existing addresses when dhcpcd starts. */ | |
cc9d9bf8 | 1502 | if (addr->iface->ctx->ra_routers == NULL) |
d3826f33 RM |
1503 | return; |
1504 | ||
cc9d9bf8 | 1505 | TAILQ_FOREACH(rap, addr->iface->ctx->ra_routers, next) { |
e83c4813 | 1506 | if (rap->iface != addr->iface) |
a8df1b28 | 1507 | continue; |
90149620 | 1508 | ipv6_handleifa_addrs(cmd, &rap->addrs, addr, pid); |
a8df1b28 RM |
1509 | } |
1510 | } | |
1511 | ||
91cd7324 | 1512 | void |
e82129a4 | 1513 | ipv6nd_expirera(void *arg) |
91cd7324 RM |
1514 | { |
1515 | struct interface *ifp; | |
eebe9a18 | 1516 | struct ra *rap, *ran; |
573d0487 | 1517 | struct timespec now, lt, expire, next; |
a1b1f0a8 | 1518 | bool expired, valid, validone; |
6d189cb6 | 1519 | struct ipv6_addr *ia; |
19005560 RM |
1520 | size_t len, olen; |
1521 | uint8_t *p; | |
1522 | struct nd_opt_hdr ndo; | |
1523 | #if 0 | |
1524 | struct nd_opt_prefix_info pi; | |
a1b1f0a8 | 1525 | #endif |
19005560 RM |
1526 | struct nd_opt_dnssl dnssl; |
1527 | struct nd_opt_rdnss rdnss; | |
1528 | uint32_t ltime; | |
1529 | size_t nexpired = 0; | |
91cd7324 RM |
1530 | |
1531 | ifp = arg; | |
b3f1735b | 1532 | clock_gettime(CLOCK_MONOTONIC, &now); |
a1b1f0a8 | 1533 | expired = false; |
573d0487 | 1534 | timespecclear(&next); |
91cd7324 | 1535 | |
cc9d9bf8 | 1536 | TAILQ_FOREACH_SAFE(rap, ifp->ctx->ra_routers, next, ran) { |
eebe9a18 RM |
1537 | if (rap->iface != ifp) |
1538 | continue; | |
a1b1f0a8 | 1539 | valid = validone = false; |
4f422dd3 | 1540 | if (rap->lifetime) { |
717bc86c | 1541 | lt.tv_sec = (time_t)rap->lifetime; |
573d0487 | 1542 | lt.tv_nsec = 0; |
f5c3ca19 | 1543 | timespecadd(&rap->acquired, <, &expire); |
19005560 | 1544 | if (timespeccmp(&now, &expire, >)) { |
4f422dd3 | 1545 | if (!rap->expired) { |
94d1ded9 | 1546 | logwarnx("%s: %s: router expired", |
4f422dd3 RM |
1547 | ifp->name, rap->sfrom); |
1548 | rap->expired = expired = 1; | |
2f53bfd4 | 1549 | rap->lifetime = 0; |
4f422dd3 RM |
1550 | } |
1551 | } else { | |
a1b1f0a8 | 1552 | valid = true; |
573d0487 RM |
1553 | timespecsub(&expire, &now, <); |
1554 | if (!timespecisset(&next) || | |
1555 | timespeccmp(&next, <, >)) | |
4f422dd3 | 1556 | next = lt; |
35308011 | 1557 | } |
35308011 RM |
1558 | } |
1559 | ||
6d189cb6 RM |
1560 | /* Not every prefix is tied to an address which |
1561 | * the kernel can expire, so we need to handle it ourself. | |
1562 | * Also, some OS don't support address lifetimes (Solaris). */ | |
1563 | TAILQ_FOREACH(ia, &rap->addrs, next) { | |
680ed015 | 1564 | if (ia->prefix_vltime == 0) |
6d189cb6 | 1565 | continue; |
680ed015 | 1566 | if (ia->prefix_vltime == ND6_INFINITE_LIFETIME) { |
a1b1f0a8 | 1567 | validone = true; |
680ed015 RM |
1568 | continue; |
1569 | } | |
6d189cb6 RM |
1570 | lt.tv_sec = (time_t)ia->prefix_vltime; |
1571 | lt.tv_nsec = 0; | |
1572 | timespecadd(&ia->acquired, <, &expire); | |
1573 | if (timespeccmp(&now, &expire, >)) { | |
1574 | if (ia->flags & IPV6_AF_ADDED) { | |
94d1ded9 | 1575 | logwarnx("%s: expired address %s", |
6d189cb6 RM |
1576 | ia->iface->name, ia->saddr); |
1577 | if (if_address6(RTM_DELADDR, ia)== -1 && | |
1578 | errno != EADDRNOTAVAIL && | |
1579 | errno != ENXIO) | |
94d1ded9 | 1580 | logerr(__func__); |
6d189cb6 RM |
1581 | } |
1582 | ia->prefix_vltime = ia->prefix_pltime = 0; | |
1583 | ia->flags &= | |
1584 | ~(IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED); | |
a1b1f0a8 | 1585 | expired = true; |
6d189cb6 RM |
1586 | } else { |
1587 | timespecsub(&expire, &now, <); | |
1588 | if (!timespecisset(&next) || | |
1589 | timespeccmp(&next, <, >)) | |
1590 | next = lt; | |
a1b1f0a8 | 1591 | validone = true; |
6d189cb6 RM |
1592 | } |
1593 | } | |
1594 | ||
19005560 RM |
1595 | /* Work out expiry for ND options */ |
1596 | len = rap->data_len - sizeof(struct nd_router_advert); | |
1597 | for (p = rap->data + sizeof(struct nd_router_advert); | |
1598 | len >= sizeof(ndo); | |
1599 | p += olen, len -= olen) | |
1600 | { | |
1601 | memcpy(&ndo, p, sizeof(ndo)); | |
1602 | olen = (size_t)(ndo.nd_opt_len * 8); | |
1603 | if (olen > len) { | |
1604 | errno = EINVAL; | |
1605 | break; | |
1606 | } | |
d4e41f4b | 1607 | |
19005560 RM |
1608 | if (has_option_mask(rap->iface->options->nomasknd, |
1609 | ndo.nd_opt_type)) | |
1610 | continue; | |
1611 | ||
1612 | switch (ndo.nd_opt_type) { | |
1613 | /* Prefix info is already checked in the above loop. */ | |
1614 | #if 0 | |
1615 | case ND_OPT_PREFIX_INFORMATION: | |
1616 | if (len < sizeof(pi)) | |
1617 | break; | |
1618 | memcpy(&pi, p, sizeof(pi)); | |
1619 | ltime = pi.nd_opt_pi_valid_time; | |
1620 | break; | |
a1b1f0a8 | 1621 | #endif |
19005560 RM |
1622 | case ND_OPT_DNSSL: |
1623 | if (len < sizeof(dnssl)) | |
1624 | break; | |
1625 | memcpy(&dnssl, p, sizeof(dnssl)); | |
1626 | ltime = dnssl.nd_opt_dnssl_lifetime; | |
1627 | break; | |
1628 | case ND_OPT_RDNSS: | |
1629 | if (len < sizeof(rdnss)) | |
1630 | break; | |
1631 | memcpy(&rdnss, p, sizeof(rdnss)); | |
1632 | ltime = rdnss.nd_opt_rdnss_lifetime; | |
1633 | break; | |
1634 | default: | |
1635 | continue; | |
1636 | } | |
1637 | ||
1638 | if (ltime == 0) | |
1639 | continue; | |
1640 | if (ltime == ND6_INFINITE_LIFETIME) { | |
1641 | validone = true; | |
1642 | continue; | |
1643 | } | |
1644 | ||
1645 | lt.tv_sec = (time_t)ntohl(ltime); | |
1646 | lt.tv_nsec = 0; | |
1647 | timespecadd(&rap->acquired, <, &expire); | |
1648 | if (timespeccmp(&now, &expire, >)) { | |
1649 | expired = true; | |
1650 | continue; | |
1651 | } | |
1652 | ||
1653 | timespecsub(&expire, &now, <); | |
1654 | if (!timespecisset(&next) || | |
1655 | timespeccmp(&next, <, >)) | |
1656 | { | |
1657 | next = lt; | |
1658 | validone = true; | |
1659 | } | |
1660 | } | |
1661 | ||
1662 | if (valid || validone) | |
1663 | continue; | |
d4e41f4b | 1664 | |
19005560 RM |
1665 | /* Router has expired. Let's not keep a lot of them. |
1666 | * We should work out if all the options have expired .... */ | |
1667 | if (++nexpired > EXPIRED_MAX) | |
e82129a4 | 1668 | ipv6nd_free_ra(rap); |
91cd7324 RM |
1669 | } |
1670 | ||
573d0487 | 1671 | if (timespecisset(&next)) |
4eb7b489 RM |
1672 | eloop_timeout_add_tv(ifp->ctx->eloop, |
1673 | &next, ipv6nd_expirera, ifp); | |
e82129a4 | 1674 | if (expired) { |
19005560 | 1675 | logwarnx("%s: part of Router Advertisement expired", ifp->name); |
9aa11487 | 1676 | rt_build(ifp->ctx, AF_INET6); |
e82129a4 RM |
1677 | script_runreason(ifp, "ROUTERADVERT"); |
1678 | } | |
1679 | } | |
1680 | ||
1681 | void | |
1682 | ipv6nd_drop(struct interface *ifp) | |
1683 | { | |
9a593d97 | 1684 | struct ra *rap, *ran; |
b6285211 | 1685 | uint8_t expired = 0; |
e82129a4 | 1686 | |
cc9d9bf8 | 1687 | if (ifp->ctx->ra_routers == NULL) |
2433e54d RM |
1688 | return; |
1689 | ||
4eb7b489 | 1690 | eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); |
9a593d97 | 1691 | TAILQ_FOREACH_SAFE(rap, ifp->ctx->ra_routers, next, ran) { |
e82129a4 RM |
1692 | if (rap->iface == ifp) { |
1693 | rap->expired = expired = 1; | |
9a593d97 | 1694 | ipv6nd_drop_ra(rap); |
e82129a4 RM |
1695 | } |
1696 | } | |
eebe9a18 | 1697 | if (expired) { |
9aa11487 | 1698 | rt_build(ifp->ctx, AF_INET6); |
389a250b | 1699 | if ((ifp->options->options & DHCPCD_NODROP) != DHCPCD_NODROP) |
15fc1181 | 1700 | script_runreason(ifp, "ROUTERADVERT"); |
e82129a4 RM |
1701 | } |
1702 | } | |
a9d78def | 1703 | |
e82129a4 | 1704 | static void |
5fed9d43 RM |
1705 | ipv6nd_handlena(struct dhcpcd_ctx *ctx, const char *sfrom, |
1706 | struct interface *ifp, struct icmp6_hdr *icp, size_t len, int hoplimit) | |
e82129a4 RM |
1707 | { |
1708 | struct nd_neighbor_advert *nd_na; | |
7878d124 | 1709 | struct in6_addr nd_na_target; |
e82129a4 | 1710 | struct ra *rap; |
8e4ea3a4 | 1711 | uint32_t is_router, is_solicited; |
3852009b RM |
1712 | char buf[INET6_ADDRSTRLEN]; |
1713 | const char *taddr; | |
e82129a4 RM |
1714 | |
1715 | if (ifp == NULL) { | |
1716 | #ifdef DEBUG_NS | |
5fed9d43 | 1717 | logdebugx("NA for unexpected interface from %s", sfrom); |
e82129a4 RM |
1718 | #endif |
1719 | return; | |
1720 | } | |
1721 | ||
3852009b | 1722 | if ((size_t)len < sizeof(struct nd_neighbor_advert)) { |
5fed9d43 | 1723 | logerrx("%s: IPv6 NA too short from %s", ifp->name, sfrom); |
3852009b RM |
1724 | return; |
1725 | } | |
1726 | ||
a708c891 RM |
1727 | /* RFC 4861 7.1.2 */ |
1728 | if (hoplimit != 255) { | |
94d1ded9 | 1729 | logerrx("invalid hoplimit(%d) in NA from %s", |
5fed9d43 | 1730 | hoplimit, sfrom); |
a708c891 RM |
1731 | return; |
1732 | } | |
1733 | ||
e82129a4 RM |
1734 | nd_na = (struct nd_neighbor_advert *)icp; |
1735 | is_router = nd_na->nd_na_flags_reserved & ND_NA_FLAG_ROUTER; | |
1736 | is_solicited = nd_na->nd_na_flags_reserved & ND_NA_FLAG_SOLICITED; | |
3852009b RM |
1737 | taddr = inet_ntop(AF_INET6, &nd_na->nd_na_target, |
1738 | buf, INET6_ADDRSTRLEN); | |
e82129a4 | 1739 | |
7878d124 RM |
1740 | /* nd_na->nd_na_target is not aligned. */ |
1741 | memcpy(&nd_na_target, &nd_na->nd_na_target, sizeof(nd_na_target)); | |
1742 | if (IN6_IS_ADDR_MULTICAST(&nd_na_target)) { | |
94d1ded9 | 1743 | logerrx("%s: NA multicast address %s (%s)", |
5fed9d43 | 1744 | ifp->name, taddr, sfrom); |
e82129a4 RM |
1745 | return; |
1746 | } | |
1747 | ||
4eb7b489 | 1748 | TAILQ_FOREACH(rap, ctx->ra_routers, next) { |
7529fdf1 | 1749 | if (rap->iface == ifp && |
7878d124 | 1750 | IN6_ARE_ADDR_EQUAL(&rap->from, &nd_na_target)) |
e82129a4 | 1751 | break; |
e82129a4 RM |
1752 | } |
1753 | if (rap == NULL) { | |
e82129a4 | 1754 | #ifdef DEBUG_NS |
0e56d022 | 1755 | logdebugx("%s: unexpected NA from %s for %s", |
5fed9d43 | 1756 | ifp->name, sfrom, taddr); |
e82129a4 RM |
1757 | #endif |
1758 | return; | |
1759 | } | |
1760 | ||
1761 | #ifdef DEBUG_NS | |
0e56d022 | 1762 | logdebugx("%s: %sNA for %s from %s", |
5fed9d43 | 1763 | ifp->name, is_solicited ? "solicited " : "", taddr, sfrom); |
e82129a4 RM |
1764 | #endif |
1765 | ||
1766 | /* Node is no longer a router, so remove it from consideration */ | |
1767 | if (!is_router && !rap->expired) { | |
9efdc92f | 1768 | loginfox("%s: %s not a router (%s)", |
5fed9d43 | 1769 | ifp->name, taddr, sfrom); |
e82129a4 | 1770 | rap->expired = 1; |
9aa11487 | 1771 | rt_build(ifp->ctx, AF_INET6); |
294eff4d | 1772 | script_runreason(ifp, "ROUTERADVERT"); |
e82129a4 RM |
1773 | return; |
1774 | } | |
1775 | ||
07b28b41 RM |
1776 | if (is_solicited && is_router && rap->lifetime) |
1777 | ipv6nd_reachable(rap, IPV6ND_REACHABLE); | |
91cd7324 RM |
1778 | } |
1779 | ||
e82129a4 | 1780 | static void |
4eb7b489 | 1781 | ipv6nd_handledata(void *arg) |
e82129a4 | 1782 | { |
cc9d9bf8 | 1783 | struct dhcpcd_ctx *ctx; |
b2edc303 | 1784 | int s; |
5fed9d43 RM |
1785 | struct sockaddr_in6 from; |
1786 | unsigned char buf[64 * 1024]; /* Maximum ICMPv6 size */ | |
1787 | struct iovec iov = { | |
1788 | .iov_base = buf, | |
1789 | .iov_len = sizeof(buf), | |
1790 | }; | |
1791 | unsigned char ctl[CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int))] = { 0 }; | |
1792 | struct msghdr msg = { | |
1793 | .msg_name = &from, .msg_namelen = sizeof(from), | |
1794 | .msg_iov = &iov, .msg_iovlen = 1, | |
1795 | .msg_control = ctl, .msg_controllen = sizeof(ctl), | |
1796 | }; | |
e82129a4 | 1797 | ssize_t len; |
5fed9d43 | 1798 | char sfrom[INET6_ADDRSTRLEN]; |
0ac6d9c9 | 1799 | int hoplimit = 0; |
e82129a4 RM |
1800 | struct icmp6_hdr *icp; |
1801 | struct interface *ifp; | |
1802 | ||
b2edc303 RM |
1803 | #ifdef __sun |
1804 | struct rs_state *state; | |
1805 | ||
1806 | ifp = arg; | |
1807 | state = RS_STATE(ifp); | |
1808 | ctx = ifp->ctx; | |
1809 | s = state->nd_fd; | |
1810 | #else | |
cc9d9bf8 | 1811 | ctx = arg; |
b2edc303 RM |
1812 | s = ctx->nd_fd; |
1813 | #endif | |
1814 | len = recvmsg(s, &msg, 0); | |
fddd88ae | 1815 | if (len == -1) { |
94d1ded9 | 1816 | logerr(__func__); |
e82129a4 RM |
1817 | return; |
1818 | } | |
5fed9d43 | 1819 | inet_ntop(AF_INET6, &from.sin6_addr, sfrom, sizeof(sfrom)); |
e82129a4 | 1820 | if ((size_t)len < sizeof(struct icmp6_hdr)) { |
5fed9d43 | 1821 | logerrx("IPv6 ICMP packet too short from %s", sfrom); |
e82129a4 RM |
1822 | return; |
1823 | } | |
1824 | ||
b2edc303 RM |
1825 | #ifdef __sun |
1826 | if_findifpfromcmsg(ctx, &msg, &hoplimit); | |
1827 | #else | |
0ac6d9c9 RM |
1828 | ifp = if_findifpfromcmsg(ctx, &msg, &hoplimit); |
1829 | if (ifp == NULL) { | |
1830 | logerr(__func__); | |
e82129a4 RM |
1831 | return; |
1832 | } | |
b2edc303 | 1833 | #endif |
e82129a4 | 1834 | |
3479ca77 | 1835 | /* Don't do anything if the user hasn't configured it. */ |
0ac6d9c9 RM |
1836 | if (ifp->active != IF_ACTIVE_USER || |
1837 | !(ifp->options->options & DHCPCD_IPV6)) | |
3479ca77 RM |
1838 | return; |
1839 | ||
5fed9d43 | 1840 | icp = (struct icmp6_hdr *)buf; |
e82129a4 RM |
1841 | if (icp->icmp6_code == 0) { |
1842 | switch(icp->icmp6_type) { | |
1843 | case ND_NEIGHBOR_ADVERT: | |
5fed9d43 RM |
1844 | ipv6nd_handlena(ctx, sfrom, |
1845 | ifp, icp, (size_t)len, hoplimit); | |
e82129a4 RM |
1846 | return; |
1847 | case ND_ROUTER_ADVERT: | |
5fed9d43 RM |
1848 | ipv6nd_handlera(ctx, &from, sfrom, |
1849 | ifp, icp, (size_t)len, hoplimit); | |
e82129a4 RM |
1850 | return; |
1851 | } | |
1852 | } | |
7cece083 | 1853 | |
94d1ded9 | 1854 | logerrx("invalid IPv6 type %d or code %d from %s", |
5fed9d43 | 1855 | icp->icmp6_type, icp->icmp6_code, sfrom); |
e82129a4 RM |
1856 | } |
1857 | ||
d936ec19 | 1858 | static void |
6e6e06af | 1859 | ipv6nd_startrs1(void *arg) |
91cd7324 | 1860 | { |
6e6e06af | 1861 | struct interface *ifp = arg; |
ca15a0aa | 1862 | struct rs_state *state; |
91cd7324 | 1863 | |
9efdc92f | 1864 | loginfox("%s: soliciting an IPv6 router", ifp->name); |
673e81e5 RM |
1865 | state = RS_STATE(ifp); |
1866 | if (state == NULL) { | |
e82129a4 | 1867 | ifp->if_data[IF_DATA_IPV6ND] = calloc(1, sizeof(*state)); |
673e81e5 | 1868 | state = RS_STATE(ifp); |
fbbb0875 | 1869 | if (state == NULL) { |
94d1ded9 | 1870 | logerr(__func__); |
6e6e06af | 1871 | return; |
fbbb0875 | 1872 | } |
b0a0f6d4 | 1873 | #ifdef __sun |
b2edc303 | 1874 | state->nd_fd = -1; |
b0a0f6d4 | 1875 | #endif |
673e81e5 RM |
1876 | } |
1877 | ||
b2edc303 RM |
1878 | #ifdef __sun |
1879 | if (ipv6nd_open(ifp) == -1) { | |
1880 | logerr(__func__); | |
1881 | return; | |
673e81e5 | 1882 | } |
b2edc303 RM |
1883 | #else |
1884 | if (ipv6nd_open(ifp->ctx) == -1) { | |
1885 | logerr(__func__); | |
1886 | return; | |
1887 | } | |
1888 | #endif | |
673e81e5 RM |
1889 | |
1890 | /* Always make a new probe as the underlying hardware | |
1891 | * address could have changed. */ | |
e82129a4 | 1892 | ipv6nd_makersprobe(ifp); |
fbbb0875 | 1893 | if (state->rs == NULL) { |
94d1ded9 | 1894 | logerr(__func__); |
6e6e06af | 1895 | return; |
fbbb0875 | 1896 | } |
91cd7324 | 1897 | |
cd09e583 | 1898 | state->retrans = RETRANS_TIMER; |
ca15a0aa | 1899 | state->rsprobes = 0; |
e82129a4 | 1900 | ipv6nd_sendrsprobe(ifp); |
6e6e06af RM |
1901 | } |
1902 | ||
1903 | void | |
1904 | ipv6nd_startrs(struct interface *ifp) | |
1905 | { | |
573d0487 | 1906 | struct timespec tv; |
6e6e06af | 1907 | |
d936ec19 | 1908 | eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); |
f572315d RM |
1909 | if (!(ifp->options->options & DHCPCD_INITIAL_DELAY)) { |
1910 | ipv6nd_startrs1(ifp); | |
1911 | return; | |
1912 | } | |
1913 | ||
6e6e06af | 1914 | tv.tv_sec = 0; |
573d0487 RM |
1915 | tv.tv_nsec = (suseconds_t)arc4random_uniform( |
1916 | MAX_RTR_SOLICITATION_DELAY * NSEC_PER_SEC); | |
1917 | timespecnorm(&tv); | |
0e56d022 | 1918 | logdebugx("%s: delaying IPv6 router solicitation for %0.1f seconds", |
573d0487 | 1919 | ifp->name, timespec_to_double(&tv)); |
6e6e06af RM |
1920 | eloop_timeout_add_tv(ifp->ctx->eloop, &tv, ipv6nd_startrs1, ifp); |
1921 | return; | |
91cd7324 | 1922 | } |