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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
e3169126 | 2 | /*** |
810adae9 | 3 | Copyright © 2014 Intel Corporation. All rights reserved. |
e3169126 PF |
4 | ***/ |
5 | ||
6 | #include <netinet/icmp6.h> | |
07630cea | 7 | #include <netinet/in.h> |
e3169126 | 8 | |
07630cea LP |
9 | #include "sd-ndisc.h" |
10 | ||
b5efdb8a | 11 | #include "alloc-util.h" |
ff4b0321 | 12 | #include "event-util.h" |
1e7a0e21 | 13 | #include "fd-util.h" |
07630cea | 14 | #include "icmp6-util.h" |
9d96e6c3 | 15 | #include "in-addr-util.h" |
0a970718 | 16 | #include "memory-util.h" |
1e7a0e21 LP |
17 | #include "ndisc-internal.h" |
18 | #include "ndisc-router.h" | |
61a9fa8f | 19 | #include "network-common.h" |
1bd6f895 | 20 | #include "random-util.h" |
940367a0 | 21 | #include "socket-util.h" |
a2dcda32 | 22 | #include "string-table.h" |
d7fa4380 | 23 | #include "string-util.h" |
e3169126 | 24 | |
1bd6f895 | 25 | #define NDISC_TIMEOUT_NO_RA_USEC (NDISC_ROUTER_SOLICITATION_INTERVAL * NDISC_MAX_ROUTER_SOLICITATIONS) |
e3169126 | 26 | |
a2dcda32 YW |
27 | static const char * const ndisc_event_table[_SD_NDISC_EVENT_MAX] = { |
28 | [SD_NDISC_EVENT_TIMEOUT] = "timeout", | |
29 | [SD_NDISC_EVENT_ROUTER] = "router", | |
30 | }; | |
31 | ||
2324fd3a | 32 | DEFINE_STRING_TABLE_LOOKUP(ndisc_event, sd_ndisc_event_t); |
a2dcda32 | 33 | |
2324fd3a | 34 | static void ndisc_callback(sd_ndisc *ndisc, sd_ndisc_event_t event, sd_ndisc_router *rt) { |
1e7a0e21 | 35 | assert(ndisc); |
a2dcda32 | 36 | assert(event >= 0 && event < _SD_NDISC_EVENT_MAX); |
e3169126 | 37 | |
35388783 YW |
38 | if (!ndisc->callback) |
39 | return (void) log_ndisc(ndisc, "Received '%s' event.", ndisc_event_to_string(event)); | |
9d96e6c3 | 40 | |
35388783 | 41 | log_ndisc(ndisc, "Invoking callback for '%s' event.", ndisc_event_to_string(event)); |
1e7a0e21 | 42 | ndisc->callback(ndisc, event, rt, ndisc->userdata); |
5624c480 PF |
43 | } |
44 | ||
17347053 | 45 | int sd_ndisc_set_callback( |
a1140666 | 46 | sd_ndisc *nd, |
a1140666 LP |
47 | sd_ndisc_callback_t callback, |
48 | void *userdata) { | |
49 | ||
50 | assert_return(nd, -EINVAL); | |
e3169126 PF |
51 | |
52 | nd->callback = callback; | |
53 | nd->userdata = userdata; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
17347053 | 58 | int sd_ndisc_set_ifindex(sd_ndisc *nd, int ifindex) { |
2f8e7633 LP |
59 | assert_return(nd, -EINVAL); |
60 | assert_return(ifindex > 0, -EINVAL); | |
1e7a0e21 | 61 | assert_return(nd->fd < 0, -EBUSY); |
e3169126 | 62 | |
2f8e7633 | 63 | nd->ifindex = ifindex; |
e3169126 PF |
64 | return 0; |
65 | } | |
66 | ||
61a9fa8f YW |
67 | int sd_ndisc_set_ifname(sd_ndisc *nd, const char *ifname) { |
68 | assert_return(nd, -EINVAL); | |
69 | assert_return(ifname, -EINVAL); | |
70 | ||
71 | if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) | |
72 | return -EINVAL; | |
73 | ||
74 | return free_and_strdup(&nd->ifname, ifname); | |
75 | } | |
76 | ||
5977b71f YW |
77 | int sd_ndisc_get_ifname(sd_ndisc *nd, const char **ret) { |
78 | int r; | |
79 | ||
80 | assert_return(nd, -EINVAL); | |
61a9fa8f | 81 | |
5977b71f YW |
82 | r = get_ifname(nd->ifindex, &nd->ifname); |
83 | if (r < 0) | |
84 | return r; | |
85 | ||
86 | if (ret) | |
87 | *ret = nd->ifname; | |
88 | ||
89 | return 0; | |
61a9fa8f YW |
90 | } |
91 | ||
17347053 | 92 | int sd_ndisc_set_mac(sd_ndisc *nd, const struct ether_addr *mac_addr) { |
a1140666 | 93 | assert_return(nd, -EINVAL); |
e3169126 PF |
94 | |
95 | if (mac_addr) | |
1e7a0e21 | 96 | nd->mac_addr = *mac_addr; |
e3169126 | 97 | else |
eccaf899 | 98 | zero(nd->mac_addr); |
e3169126 PF |
99 | |
100 | return 0; | |
e3169126 PF |
101 | } |
102 | ||
17347053 | 103 | int sd_ndisc_attach_event(sd_ndisc *nd, sd_event *event, int64_t priority) { |
e3169126 PF |
104 | int r; |
105 | ||
106 | assert_return(nd, -EINVAL); | |
1e7a0e21 | 107 | assert_return(nd->fd < 0, -EBUSY); |
e3169126 PF |
108 | assert_return(!nd->event, -EBUSY); |
109 | ||
110 | if (event) | |
111 | nd->event = sd_event_ref(event); | |
112 | else { | |
113 | r = sd_event_default(&nd->event); | |
114 | if (r < 0) | |
115 | return 0; | |
116 | } | |
117 | ||
118 | nd->event_priority = priority; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
17347053 | 123 | int sd_ndisc_detach_event(sd_ndisc *nd) { |
1e7a0e21 | 124 | |
e3169126 | 125 | assert_return(nd, -EINVAL); |
1e7a0e21 | 126 | assert_return(nd->fd < 0, -EBUSY); |
e3169126 PF |
127 | |
128 | nd->event = sd_event_unref(nd->event); | |
e3169126 PF |
129 | return 0; |
130 | } | |
131 | ||
17347053 | 132 | sd_event *sd_ndisc_get_event(sd_ndisc *nd) { |
a1140666 | 133 | assert_return(nd, NULL); |
e3169126 PF |
134 | |
135 | return nd->event; | |
136 | } | |
137 | ||
165ad41b | 138 | static void ndisc_reset(sd_ndisc *nd) { |
e3169126 PF |
139 | assert(nd); |
140 | ||
ff4b0321 YW |
141 | (void) event_source_disable(nd->timeout_event_source); |
142 | (void) event_source_disable(nd->timeout_no_ra); | |
1bd6f895 | 143 | nd->retransmit_time = 0; |
eb2f7502 | 144 | nd->recv_event_source = sd_event_source_disable_unref(nd->recv_event_source); |
1e7a0e21 | 145 | nd->fd = safe_close(nd->fd); |
e3169126 PF |
146 | } |
147 | ||
8301aa0b YW |
148 | static sd_ndisc *ndisc_free(sd_ndisc *nd) { |
149 | assert(nd); | |
e3169126 | 150 | |
5c4c338a | 151 | ndisc_reset(nd); |
eb2f7502 YW |
152 | |
153 | sd_event_source_unref(nd->timeout_event_source); | |
154 | sd_event_source_unref(nd->timeout_no_ra); | |
4d7b83da | 155 | sd_ndisc_detach_event(nd); |
eb2f7502 | 156 | |
61a9fa8f | 157 | free(nd->ifname); |
6b430fdb | 158 | return mfree(nd); |
e3169126 PF |
159 | } |
160 | ||
8301aa0b YW |
161 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_ndisc, sd_ndisc, ndisc_free); |
162 | ||
17347053 | 163 | int sd_ndisc_new(sd_ndisc **ret) { |
4afd3348 | 164 | _cleanup_(sd_ndisc_unrefp) sd_ndisc *nd = NULL; |
e3169126 | 165 | |
a1140666 | 166 | assert_return(ret, -EINVAL); |
e3169126 | 167 | |
144faa8e | 168 | nd = new(sd_ndisc, 1); |
e3169126 PF |
169 | if (!nd) |
170 | return -ENOMEM; | |
171 | ||
144faa8e YW |
172 | *nd = (sd_ndisc) { |
173 | .n_ref = 1, | |
254d1313 | 174 | .fd = -EBADF, |
144faa8e | 175 | }; |
e3169126 | 176 | |
1cc6c93a | 177 | *ret = TAKE_PTR(nd); |
e3169126 PF |
178 | |
179 | return 0; | |
180 | } | |
181 | ||
1e7a0e21 | 182 | static int ndisc_handle_datagram(sd_ndisc *nd, sd_ndisc_router *rt) { |
f6e0ce66 | 183 | int r; |
d77bde34 | 184 | |
f6e0ce66 | 185 | assert(nd); |
1e7a0e21 | 186 | assert(rt); |
d77bde34 | 187 | |
35388783 | 188 | r = ndisc_router_parse(nd, rt); |
f6e0ce66 | 189 | if (r < 0) |
ab8a8a4e | 190 | return r; |
09667885 | 191 | |
35388783 | 192 | log_ndisc(nd, "Received Router Advertisement: flags %s preference %s lifetime %" PRIu16 " sec", |
1e7a0e21 LP |
193 | rt->flags & ND_RA_FLAG_MANAGED ? "MANAGED" : rt->flags & ND_RA_FLAG_OTHER ? "OTHER" : "none", |
194 | rt->preference == SD_NDISC_PREFERENCE_HIGH ? "high" : rt->preference == SD_NDISC_PREFERENCE_LOW ? "low" : "medium", | |
195 | rt->lifetime); | |
09667885 | 196 | |
1e7a0e21 | 197 | ndisc_callback(nd, SD_NDISC_EVENT_ROUTER, rt); |
09667885 PF |
198 | return 0; |
199 | } | |
200 | ||
1e7a0e21 LP |
201 | static int ndisc_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
202 | _cleanup_(sd_ndisc_router_unrefp) sd_ndisc_router *rt = NULL; | |
99534007 | 203 | sd_ndisc *nd = ASSERT_PTR(userdata); |
88d5a3db PF |
204 | ssize_t buflen; |
205 | int r; | |
e3169126 PF |
206 | |
207 | assert(s); | |
e3169126 PF |
208 | assert(nd->event); |
209 | ||
4edc2c9b | 210 | buflen = next_datagram_size_fd(fd); |
1f2db2e3 ZJS |
211 | if (ERRNO_IS_NEG_TRANSIENT(buflen) || ERRNO_IS_NEG_DISCONNECT(buflen)) |
212 | return 0; | |
35388783 YW |
213 | if (buflen < 0) { |
214 | log_ndisc_errno(nd, buflen, "Failed to determine datagram size to read, ignoring: %m"); | |
215 | return 0; | |
216 | } | |
cddf4d81 | 217 | |
1e7a0e21 LP |
218 | rt = ndisc_router_new(buflen); |
219 | if (!rt) | |
09667885 PF |
220 | return -ENOMEM; |
221 | ||
0afa4d56 | 222 | r = icmp6_receive(fd, NDISC_ROUTER_RAW(rt), rt->raw_size, &rt->address, &rt->timestamp); |
1f2db2e3 ZJS |
223 | if (ERRNO_IS_NEG_TRANSIENT(r) || ERRNO_IS_NEG_DISCONNECT(r)) |
224 | return 0; | |
225 | if (r < 0) | |
88d5a3db PF |
226 | switch (r) { |
227 | case -EADDRNOTAVAIL: | |
4961f566 | 228 | log_ndisc(nd, "Received RA from neither link-local nor null address. Ignoring."); |
1f2db2e3 | 229 | return 0; |
88d5a3db PF |
230 | |
231 | case -EMULTIHOP: | |
35388783 | 232 | log_ndisc(nd, "Received RA with invalid hop limit. Ignoring."); |
1f2db2e3 | 233 | return 0; |
88d5a3db PF |
234 | |
235 | case -EPFNOSUPPORT: | |
35388783 | 236 | log_ndisc(nd, "Received invalid source address from ICMPv6 socket. Ignoring."); |
1f2db2e3 | 237 | return 0; |
437524f1 | 238 | |
437524f1 | 239 | default: |
35388783 | 240 | log_ndisc_errno(nd, r, "Unexpected error while reading from ICMPv6, ignoring: %m"); |
1f2db2e3 | 241 | return 0; |
1e7a0e21 LP |
242 | } |
243 | ||
4961f566 YW |
244 | /* The function icmp6_receive() accepts the null source address, but RFC 4861 Section 6.1.2 states |
245 | * that hosts MUST discard messages with the null source address. */ | |
246 | if (in6_addr_is_null(&rt->address)) | |
247 | log_ndisc(nd, "Received RA from null address. Ignoring."); | |
248 | ||
ff4b0321 | 249 | (void) event_source_disable(nd->timeout_event_source); |
ab8a8a4e YW |
250 | (void) ndisc_handle_datagram(nd, rt); |
251 | return 0; | |
e3169126 PF |
252 | } |
253 | ||
1bd6f895 PF |
254 | static usec_t ndisc_timeout_compute_random(usec_t val) { |
255 | /* compute a time that is random within ±10% of the given value */ | |
256 | return val - val / 10 + | |
257 | (random_u64() % (2 * USEC_PER_SEC)) * val / 10 / USEC_PER_SEC; | |
258 | } | |
259 | ||
1e7a0e21 | 260 | static int ndisc_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
99534007 | 261 | sd_ndisc *nd = ASSERT_PTR(userdata); |
1bd6f895 | 262 | usec_t time_now; |
e3169126 PF |
263 | int r; |
264 | ||
265 | assert(s); | |
e3169126 PF |
266 | assert(nd->event); |
267 | ||
ba4e0427 | 268 | assert_se(sd_event_now(nd->event, CLOCK_BOOTTIME, &time_now) >= 0); |
e3169126 | 269 | |
1bd6f895 PF |
270 | if (!nd->retransmit_time) |
271 | nd->retransmit_time = ndisc_timeout_compute_random(NDISC_ROUTER_SOLICITATION_INTERVAL); | |
272 | else { | |
273 | if (nd->retransmit_time > NDISC_MAX_ROUTER_SOLICITATION_INTERVAL / 2) | |
274 | nd->retransmit_time = ndisc_timeout_compute_random(NDISC_MAX_ROUTER_SOLICITATION_INTERVAL); | |
275 | else | |
276 | nd->retransmit_time += ndisc_timeout_compute_random(nd->retransmit_time); | |
1e7a0e21 | 277 | } |
9021bb9f | 278 | |
ff4b0321 | 279 | r = event_reset_time(nd->event, &nd->timeout_event_source, |
ba4e0427 | 280 | CLOCK_BOOTTIME, |
ff4b0321 YW |
281 | time_now + nd->retransmit_time, 10 * USEC_PER_MSEC, |
282 | ndisc_timeout, nd, | |
283 | nd->event_priority, "ndisc-timeout-no-ra", true); | |
1bd6f895 PF |
284 | if (r < 0) |
285 | goto fail; | |
286 | ||
e82a19cb | 287 | r = icmp6_send_router_solicitation(nd->fd, &nd->mac_addr); |
852bf938 YW |
288 | if (r < 0) |
289 | log_ndisc_errno(nd, r, "Failed to send Router Solicitation, next solicitation in %s, ignoring: %m", | |
290 | FORMAT_TIMESPAN(nd->retransmit_time, USEC_PER_SEC)); | |
291 | else | |
292 | log_ndisc(nd, "Sent Router Solicitation, next solicitation in %s", | |
293 | FORMAT_TIMESPAN(nd->retransmit_time, USEC_PER_SEC)); | |
1bd6f895 | 294 | |
e3169126 | 295 | return 0; |
b9e7b1cf LP |
296 | |
297 | fail: | |
76f713df | 298 | (void) sd_ndisc_stop(nd); |
b9e7b1cf | 299 | return 0; |
e3169126 PF |
300 | } |
301 | ||
1bd6f895 | 302 | static int ndisc_timeout_no_ra(sd_event_source *s, uint64_t usec, void *userdata) { |
99534007 | 303 | sd_ndisc *nd = ASSERT_PTR(userdata); |
1bd6f895 PF |
304 | |
305 | assert(s); | |
1bd6f895 | 306 | |
35388783 | 307 | log_ndisc(nd, "No RA received before link confirmation timeout"); |
1bd6f895 | 308 | |
ff4b0321 | 309 | (void) event_source_disable(nd->timeout_no_ra); |
1bd6f895 PF |
310 | ndisc_callback(nd, SD_NDISC_EVENT_TIMEOUT, NULL); |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
17347053 | 315 | int sd_ndisc_stop(sd_ndisc *nd) { |
c8bae363 YW |
316 | if (!nd) |
317 | return 0; | |
836cf090 | 318 | |
1e7a0e21 | 319 | if (nd->fd < 0) |
c1c9b211 LP |
320 | return 0; |
321 | ||
35388783 | 322 | log_ndisc(nd, "Stopping IPv6 Router Solicitation client"); |
836cf090 | 323 | |
5c4c338a | 324 | ndisc_reset(nd); |
1e7a0e21 | 325 | return 1; |
836cf090 PF |
326 | } |
327 | ||
17347053 | 328 | int sd_ndisc_start(sd_ndisc *nd) { |
e3169126 | 329 | int r; |
1bd6f895 | 330 | usec_t time_now; |
e3169126 | 331 | |
a1140666 LP |
332 | assert_return(nd, -EINVAL); |
333 | assert_return(nd->event, -EINVAL); | |
334 | assert_return(nd->ifindex > 0, -EINVAL); | |
e3169126 | 335 | |
1e7a0e21 LP |
336 | if (nd->fd >= 0) |
337 | return 0; | |
e3169126 | 338 | |
1e7a0e21 | 339 | assert(!nd->recv_event_source); |
e3169126 | 340 | |
ba4e0427 | 341 | r = sd_event_now(nd->event, CLOCK_BOOTTIME, &time_now); |
1bd6f895 PF |
342 | if (r < 0) |
343 | goto fail; | |
344 | ||
1e7a0e21 LP |
345 | nd->fd = icmp6_bind_router_solicitation(nd->ifindex); |
346 | if (nd->fd < 0) | |
347 | return nd->fd; | |
348 | ||
349 | r = sd_event_add_io(nd->event, &nd->recv_event_source, nd->fd, EPOLLIN, ndisc_recv, nd); | |
e3169126 | 350 | if (r < 0) |
5c4c338a | 351 | goto fail; |
e3169126 | 352 | |
3e261cfd | 353 | r = sd_event_source_set_priority(nd->recv_event_source, nd->event_priority); |
e3169126 | 354 | if (r < 0) |
5c4c338a | 355 | goto fail; |
e3169126 | 356 | |
3e261cfd | 357 | (void) sd_event_source_set_description(nd->recv_event_source, "ndisc-receive-message"); |
9021bb9f | 358 | |
ff4b0321 | 359 | r = event_reset_time(nd->event, &nd->timeout_event_source, |
ba4e0427 | 360 | CLOCK_BOOTTIME, |
9973e6c4 | 361 | time_now + USEC_PER_SEC / 2, 1 * USEC_PER_SEC, /* See RFC 8415 sec. 18.2.1 */ |
ff4b0321 YW |
362 | ndisc_timeout, nd, |
363 | nd->event_priority, "ndisc-timeout", true); | |
e3169126 | 364 | if (r < 0) |
5c4c338a | 365 | goto fail; |
e3169126 | 366 | |
ff4b0321 | 367 | r = event_reset_time(nd->event, &nd->timeout_no_ra, |
ba4e0427 | 368 | CLOCK_BOOTTIME, |
ff4b0321 YW |
369 | time_now + NDISC_TIMEOUT_NO_RA_USEC, 10 * USEC_PER_MSEC, |
370 | ndisc_timeout_no_ra, nd, | |
371 | nd->event_priority, "ndisc-timeout-no-ra", true); | |
9021bb9f | 372 | if (r < 0) |
5c4c338a | 373 | goto fail; |
e3169126 | 374 | |
35388783 | 375 | log_ndisc(nd, "Started IPv6 Router Solicitation client"); |
1e7a0e21 | 376 | return 1; |
e3169126 | 377 | |
5c4c338a LP |
378 | fail: |
379 | ndisc_reset(nd); | |
e3169126 PF |
380 | return r; |
381 | } |