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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8e1ad1ea LP |
2 | |
3 | #include <endian.h> | |
4 | #include <inttypes.h> | |
0b200472 | 5 | #include <net/if.h> |
8e1ad1ea LP |
6 | #include <string.h> |
7 | ||
634f0f98 | 8 | #include "alloc-util.h" |
686d13b9 | 9 | #include "env-file.h" |
8e1ad1ea | 10 | #include "fd-util.h" |
8e1ad1ea | 11 | #include "hostname-util.h" |
ef118d00 | 12 | #include "missing_network.h" |
0b200472 | 13 | #include "networkd-link.h" |
7272b25e | 14 | #include "networkd-lldp-tx.h" |
23f53b99 | 15 | #include "networkd-manager.h" |
7272b25e | 16 | #include "parse-util.h" |
8e1ad1ea LP |
17 | #include "random-util.h" |
18 | #include "socket-util.h" | |
19 | #include "string-util.h" | |
20 | #include "unaligned.h" | |
21 | ||
22 | /* The LLDP spec calls this "txFastInit", see 9.2.5.19 */ | |
23 | #define LLDP_TX_FAST_INIT 4U | |
24 | ||
25 | /* The LLDP spec calls this "msgTxHold", see 9.2.5.6 */ | |
26 | #define LLDP_TX_HOLD 4U | |
27 | ||
28 | /* The jitter range to add, see 9.2.2. */ | |
29 | #define LLDP_JITTER_USEC (400U * USEC_PER_MSEC) | |
30 | ||
31 | /* The LLDP spec calls this msgTxInterval, but we subtract half the jitter off it. */ | |
32 | #define LLDP_TX_INTERVAL_USEC (30U * USEC_PER_SEC - LLDP_JITTER_USEC / 2) | |
33 | ||
34 | /* The LLDP spec calls this msgFastTx, but we subtract half the jitter off it. */ | |
35 | #define LLDP_FAST_TX_USEC (1U * USEC_PER_SEC - LLDP_JITTER_USEC / 2) | |
36 | ||
7272b25e LP |
37 | static const struct ether_addr lldp_multicast_addr[_LLDP_EMIT_MAX] = { |
38 | [LLDP_EMIT_NEAREST_BRIDGE] = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x0e }}, | |
39 | [LLDP_EMIT_NON_TPMR_BRIDGE] = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 }}, | |
40 | [LLDP_EMIT_CUSTOMER_BRIDGE] = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }}, | |
41 | }; | |
42 | ||
0b200472 YW |
43 | bool link_lldp_emit_enabled(Link *link) { |
44 | assert(link); | |
45 | ||
46 | if (link->flags & IFF_LOOPBACK) | |
47 | return false; | |
48 | ||
49 | if (link->iftype != ARPHRD_ETHER) | |
50 | return false; | |
51 | ||
52 | if (!link->network) | |
53 | return false; | |
54 | ||
55 | return link->network->lldp_emit != LLDP_EMIT_NO; | |
56 | } | |
57 | ||
8e1ad1ea LP |
58 | static int lldp_write_tlv_header(uint8_t **p, uint8_t id, size_t sz) { |
59 | assert(p); | |
60 | ||
61 | if (id > 127) | |
62 | return -EBADMSG; | |
63 | if (sz > 511) | |
64 | return -ENOBUFS; | |
65 | ||
66 | (*p)[0] = (id << 1) | !!(sz & 256); | |
67 | (*p)[1] = sz & 255; | |
68 | ||
69 | *p = *p + 2; | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static int lldp_make_packet( | |
7272b25e | 74 | LLDPEmit mode, |
8e1ad1ea LP |
75 | const struct ether_addr *hwaddr, |
76 | const char *machine_id, | |
77 | const char *ifname, | |
78 | uint16_t ttl, | |
79 | const char *port_description, | |
80 | const char *hostname, | |
81 | const char *pretty_hostname, | |
82 | uint16_t system_capabilities, | |
83 | uint16_t enabled_capabilities, | |
84 | void **ret, size_t *sz) { | |
85 | ||
86 | size_t machine_id_length, ifname_length, port_description_length = 0, hostname_length = 0, pretty_hostname_length = 0; | |
87 | _cleanup_free_ void *packet = NULL; | |
88 | struct ether_header *h; | |
89 | uint8_t *p; | |
90 | size_t l; | |
91 | int r; | |
92 | ||
7272b25e LP |
93 | assert(mode > LLDP_EMIT_NO); |
94 | assert(mode < _LLDP_EMIT_MAX); | |
8e1ad1ea LP |
95 | assert(hwaddr); |
96 | assert(machine_id); | |
97 | assert(ifname); | |
98 | assert(ret); | |
99 | assert(sz); | |
100 | ||
101 | machine_id_length = strlen(machine_id); | |
102 | ifname_length = strlen(ifname); | |
103 | ||
104 | if (port_description) | |
105 | port_description_length = strlen(port_description); | |
106 | ||
107 | if (hostname) | |
108 | hostname_length = strlen(hostname); | |
109 | ||
110 | if (pretty_hostname) | |
111 | pretty_hostname_length = strlen(pretty_hostname); | |
112 | ||
113 | l = sizeof(struct ether_header) + | |
114 | /* Chassis ID */ | |
115 | 2 + 1 + machine_id_length + | |
116 | /* Port ID */ | |
117 | 2 + 1 + ifname_length + | |
118 | /* TTL */ | |
119 | 2 + 2 + | |
120 | /* System Capabilities */ | |
121 | 2 + 4 + | |
122 | /* End */ | |
123 | 2; | |
124 | ||
125 | /* Port Description */ | |
126 | if (port_description) | |
127 | l += 2 + port_description_length; | |
128 | ||
129 | /* System Name */ | |
130 | if (hostname) | |
131 | l += 2 + hostname_length; | |
132 | ||
133 | /* System Description */ | |
134 | if (pretty_hostname) | |
135 | l += 2 + pretty_hostname_length; | |
136 | ||
137 | packet = malloc(l); | |
138 | if (!packet) | |
139 | return -ENOMEM; | |
140 | ||
141 | h = (struct ether_header*) packet; | |
142 | h->ether_type = htobe16(ETHERTYPE_LLDP); | |
7272b25e | 143 | memcpy(h->ether_dhost, lldp_multicast_addr + mode, ETH_ALEN); |
8e1ad1ea LP |
144 | memcpy(h->ether_shost, hwaddr, ETH_ALEN); |
145 | ||
146 | p = (uint8_t*) packet + sizeof(struct ether_header); | |
147 | ||
6afa6767 | 148 | r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_CHASSIS_ID, 1 + machine_id_length); |
8e1ad1ea LP |
149 | if (r < 0) |
150 | return r; | |
6afa6767 | 151 | *(p++) = SD_LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED; |
8e1ad1ea LP |
152 | p = mempcpy(p, machine_id, machine_id_length); |
153 | ||
6afa6767 | 154 | r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_PORT_ID, 1 + ifname_length); |
8e1ad1ea LP |
155 | if (r < 0) |
156 | return r; | |
6afa6767 | 157 | *(p++) = SD_LLDP_PORT_SUBTYPE_INTERFACE_NAME; |
8e1ad1ea LP |
158 | p = mempcpy(p, ifname, ifname_length); |
159 | ||
6afa6767 | 160 | r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_TTL, 2); |
8e1ad1ea LP |
161 | if (r < 0) |
162 | return r; | |
163 | unaligned_write_be16(p, ttl); | |
164 | p += 2; | |
165 | ||
166 | if (port_description) { | |
6afa6767 | 167 | r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_PORT_DESCRIPTION, port_description_length); |
8e1ad1ea LP |
168 | if (r < 0) |
169 | return r; | |
170 | p = mempcpy(p, port_description, port_description_length); | |
171 | } | |
172 | ||
173 | if (hostname) { | |
6afa6767 | 174 | r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_NAME, hostname_length); |
8e1ad1ea LP |
175 | if (r < 0) |
176 | return r; | |
177 | p = mempcpy(p, hostname, hostname_length); | |
178 | } | |
179 | ||
180 | if (pretty_hostname) { | |
6afa6767 | 181 | r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_DESCRIPTION, pretty_hostname_length); |
8e1ad1ea LP |
182 | if (r < 0) |
183 | return r; | |
184 | p = mempcpy(p, pretty_hostname, pretty_hostname_length); | |
185 | } | |
186 | ||
6afa6767 | 187 | r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_CAPABILITIES, 4); |
8e1ad1ea LP |
188 | if (r < 0) |
189 | return r; | |
190 | unaligned_write_be16(p, system_capabilities); | |
191 | p += 2; | |
192 | unaligned_write_be16(p, enabled_capabilities); | |
193 | p += 2; | |
194 | ||
6afa6767 | 195 | r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_END, 0); |
8e1ad1ea LP |
196 | if (r < 0) |
197 | return r; | |
198 | ||
199 | assert(p == (uint8_t*) packet + l); | |
200 | ||
1cc6c93a | 201 | *ret = TAKE_PTR(packet); |
8e1ad1ea LP |
202 | *sz = l; |
203 | ||
8e1ad1ea LP |
204 | return 0; |
205 | } | |
206 | ||
7272b25e LP |
207 | static int lldp_send_packet( |
208 | int ifindex, | |
209 | const struct ether_addr *address, | |
210 | const void *packet, | |
211 | size_t packet_size) { | |
8e1ad1ea LP |
212 | |
213 | union sockaddr_union sa = { | |
214 | .ll.sll_family = AF_PACKET, | |
215 | .ll.sll_protocol = htobe16(ETHERTYPE_LLDP), | |
216 | .ll.sll_ifindex = ifindex, | |
217 | .ll.sll_halen = ETH_ALEN, | |
8e1ad1ea LP |
218 | }; |
219 | ||
220 | _cleanup_close_ int fd = -1; | |
221 | ssize_t l; | |
222 | ||
223 | assert(ifindex > 0); | |
7272b25e | 224 | assert(address); |
8e1ad1ea LP |
225 | assert(packet || packet_size <= 0); |
226 | ||
7272b25e LP |
227 | memcpy(sa.ll.sll_addr, address, ETH_ALEN); |
228 | ||
8e1ad1ea LP |
229 | fd = socket(PF_PACKET, SOCK_RAW|SOCK_CLOEXEC, IPPROTO_RAW); |
230 | if (fd < 0) | |
231 | return -errno; | |
232 | ||
233 | l = sendto(fd, packet, packet_size, MSG_NOSIGNAL, &sa.sa, sizeof(sa.ll)); | |
234 | if (l < 0) | |
235 | return -errno; | |
236 | ||
237 | if ((size_t) l != packet_size) | |
238 | return -EIO; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static int link_send_lldp(Link *link) { | |
244 | char machine_id_string[SD_ID128_STRING_MAX]; | |
245 | _cleanup_free_ char *hostname = NULL, *pretty_hostname = NULL; | |
246 | _cleanup_free_ void *packet = NULL; | |
247 | size_t packet_size = 0; | |
248 | sd_id128_t machine_id; | |
249 | uint16_t caps; | |
250 | usec_t ttl; | |
251 | int r; | |
252 | ||
7272b25e LP |
253 | assert(link); |
254 | ||
255 | if (!link->network || link->network->lldp_emit == LLDP_EMIT_NO) | |
256 | return 0; | |
257 | ||
258 | assert(link->network->lldp_emit < _LLDP_EMIT_MAX); | |
259 | ||
8e1ad1ea LP |
260 | r = sd_id128_get_machine(&machine_id); |
261 | if (r < 0) | |
262 | return r; | |
263 | ||
264 | (void) gethostname_strict(&hostname); | |
13df9c39 | 265 | (void) parse_env_file(NULL, "/etc/machine-info", "PRETTY_HOSTNAME", &pretty_hostname); |
8e1ad1ea | 266 | |
c8cf4dc1 | 267 | assert_cc(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1 <= (UINT16_MAX - 1) * USEC_PER_SEC); |
8e1ad1ea | 268 | ttl = DIV_ROUND_UP(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1, USEC_PER_SEC); |
8e1ad1ea LP |
269 | |
270 | caps = (link->network && link->network->ip_forward != ADDRESS_FAMILY_NO) ? | |
6afa6767 BG |
271 | SD_LLDP_SYSTEM_CAPABILITIES_ROUTER : |
272 | SD_LLDP_SYSTEM_CAPABILITIES_STATION; | |
8e1ad1ea | 273 | |
7272b25e LP |
274 | r = lldp_make_packet(link->network->lldp_emit, |
275 | &link->mac, | |
8e1ad1ea LP |
276 | sd_id128_to_string(machine_id, machine_id_string), |
277 | link->ifname, | |
278 | (uint16_t) ttl, | |
279 | link->network ? link->network->description : NULL, | |
280 | hostname, | |
281 | pretty_hostname, | |
6afa6767 | 282 | SD_LLDP_SYSTEM_CAPABILITIES_STATION|SD_LLDP_SYSTEM_CAPABILITIES_BRIDGE|SD_LLDP_SYSTEM_CAPABILITIES_ROUTER, |
8e1ad1ea LP |
283 | caps, |
284 | &packet, &packet_size); | |
285 | if (r < 0) | |
286 | return r; | |
287 | ||
7272b25e | 288 | return lldp_send_packet(link->ifindex, lldp_multicast_addr + link->network->lldp_emit, packet, packet_size); |
8e1ad1ea LP |
289 | } |
290 | ||
291 | static int on_lldp_timer(sd_event_source *s, usec_t t, void *userdata) { | |
292 | Link *link = userdata; | |
293 | usec_t current, delay, next; | |
294 | int r; | |
295 | ||
296 | assert(s); | |
297 | assert(userdata); | |
298 | ||
299 | log_link_debug(link, "Sending LLDP packet..."); | |
300 | ||
301 | r = link_send_lldp(link); | |
302 | if (r < 0) | |
303 | log_link_debug_errno(link, r, "Failed to send LLDP packet, ignoring: %m"); | |
304 | ||
305 | if (link->lldp_tx_fast > 0) | |
306 | link->lldp_tx_fast--; | |
307 | ||
308 | assert_se(sd_event_now(sd_event_source_get_event(s), clock_boottime_or_monotonic(), ¤t) >= 0); | |
309 | ||
310 | delay = link->lldp_tx_fast > 0 ? LLDP_FAST_TX_USEC : LLDP_TX_INTERVAL_USEC; | |
311 | next = usec_add(usec_add(current, delay), (usec_t) random_u64() % LLDP_JITTER_USEC); | |
312 | ||
313 | r = sd_event_source_set_time(s, next); | |
314 | if (r < 0) | |
315 | return log_link_error_errno(link, r, "Failed to restart LLDP timer: %m"); | |
316 | ||
317 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); | |
318 | if (r < 0) | |
319 | return log_link_error_errno(link, r, "Failed to enable LLDP timer: %m"); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
7272b25e | 324 | int link_lldp_emit_start(Link *link) { |
8e1ad1ea LP |
325 | usec_t next; |
326 | int r; | |
327 | ||
328 | assert(link); | |
329 | ||
7272b25e LP |
330 | if (!link->network || link->network->lldp_emit == LLDP_EMIT_NO) { |
331 | link_lldp_emit_stop(link); | |
332 | return 0; | |
333 | } | |
334 | ||
8e1ad1ea LP |
335 | /* Starts the LLDP transmission in "fast" mode. If it is already started, turns "fast" mode back on again. */ |
336 | ||
337 | link->lldp_tx_fast = LLDP_TX_FAST_INIT; | |
338 | ||
339 | next = usec_add(usec_add(now(clock_boottime_or_monotonic()), LLDP_FAST_TX_USEC), | |
340 | (usec_t) random_u64() % LLDP_JITTER_USEC); | |
341 | ||
7272b25e | 342 | if (link->lldp_emit_event_source) { |
8e1ad1ea LP |
343 | usec_t old; |
344 | ||
345 | /* Lower the timeout, maybe */ | |
7272b25e | 346 | r = sd_event_source_get_time(link->lldp_emit_event_source, &old); |
8e1ad1ea LP |
347 | if (r < 0) |
348 | return r; | |
349 | ||
350 | if (old <= next) | |
351 | return 0; | |
352 | ||
7272b25e | 353 | return sd_event_source_set_time(link->lldp_emit_event_source, next); |
8e1ad1ea LP |
354 | } else { |
355 | r = sd_event_add_time( | |
356 | link->manager->event, | |
7272b25e | 357 | &link->lldp_emit_event_source, |
8e1ad1ea LP |
358 | clock_boottime_or_monotonic(), |
359 | next, | |
360 | 0, | |
361 | on_lldp_timer, | |
362 | link); | |
363 | if (r < 0) | |
364 | return r; | |
365 | ||
7272b25e | 366 | (void) sd_event_source_set_description(link->lldp_emit_event_source, "lldp-tx"); |
8e1ad1ea LP |
367 | } |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
7272b25e | 372 | void link_lldp_emit_stop(Link *link) { |
8e1ad1ea LP |
373 | assert(link); |
374 | ||
7272b25e LP |
375 | link->lldp_emit_event_source = sd_event_source_unref(link->lldp_emit_event_source); |
376 | } | |
377 | ||
378 | int config_parse_lldp_emit( | |
379 | const char *unit, | |
380 | const char *filename, | |
381 | unsigned line, | |
382 | const char *section, | |
383 | unsigned section_line, | |
384 | const char *lvalue, | |
385 | int ltype, | |
386 | const char *rvalue, | |
387 | void *data, | |
388 | void *userdata) { | |
389 | ||
390 | LLDPEmit *emit = data; | |
391 | int r; | |
392 | ||
393 | assert(filename); | |
394 | assert(lvalue); | |
395 | assert(rvalue); | |
396 | ||
397 | if (isempty(rvalue)) | |
398 | *emit = LLDP_EMIT_NO; | |
399 | else if (streq(rvalue, "nearest-bridge")) | |
400 | *emit = LLDP_EMIT_NEAREST_BRIDGE; | |
401 | else if (streq(rvalue, "non-tpmr-bridge")) | |
402 | *emit = LLDP_EMIT_NON_TPMR_BRIDGE; | |
403 | else if (streq(rvalue, "customer-bridge")) | |
404 | *emit = LLDP_EMIT_CUSTOMER_BRIDGE; | |
405 | else { | |
406 | r = parse_boolean(rvalue); | |
407 | if (r < 0) { | |
408 | log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse LLDP emission setting, ignoring: %s", rvalue); | |
409 | return 0; | |
410 | } | |
411 | ||
412 | *emit = r ? LLDP_EMIT_NEAREST_BRIDGE : LLDP_EMIT_NO; | |
413 | } | |
414 | ||
415 | return 0; | |
8e1ad1ea | 416 | } |