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87a1e1e0 MT |
1 | /*############################################################################# |
2 | # # | |
3 | # IPFire.org - A linux based firewall # | |
4 | # Copyright (C) 2023 IPFire Network Development Team # | |
5 | # # | |
6 | # This program is free software: you can redistribute it and/or modify # | |
7 | # it under the terms of the GNU General Public License as published by # | |
8 | # the Free Software Foundation, either version 3 of the License, or # | |
9 | # (at your option) any later version. # | |
10 | # # | |
11 | # This program is distributed in the hope that it will be useful, # | |
12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
14 | # GNU General Public License for more details. # | |
15 | # # | |
16 | # You should have received a copy of the GNU General Public License # | |
17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
18 | # # | |
19 | #############################################################################*/ | |
20 | ||
dfd49c2c | 21 | #include <linux/if.h> |
15240e08 | 22 | #include <linux/if_link.h> |
87a1e1e0 MT |
23 | #include <stddef.h> |
24 | #include <stdlib.h> | |
f650f6cd | 25 | #include <string.h> |
87a1e1e0 | 26 | |
766f08ca MT |
27 | #include <systemd/sd-netlink.h> |
28 | ||
87a1e1e0 MT |
29 | #include "daemon.h" |
30 | #include "link.h" | |
766f08ca | 31 | #include "links.h" |
eaf649ee | 32 | #include "logging.h" |
f650f6cd | 33 | #include "string.h" |
87a1e1e0 MT |
34 | |
35 | struct nw_link { | |
2361667e | 36 | nw_daemon* daemon; |
87a1e1e0 MT |
37 | int nrefs; |
38 | ||
39 | // Interface Index | |
40 | int ifindex; | |
f650f6cd MT |
41 | |
42 | // Interface Name | |
dfd49c2c | 43 | char ifname[IFNAMSIZ]; |
f37df5ea | 44 | |
371b836a MT |
45 | enum nw_link_state { |
46 | NW_LINK_UNKNOWN = 0, | |
47 | NW_LINK_DESTROYED, | |
48 | } state; | |
49 | ||
15240e08 MT |
50 | // Stats |
51 | struct rtnl_link_stats64 stats64; | |
52 | ||
f37df5ea MT |
53 | // MTU |
54 | uint32_t mtu; | |
55 | uint32_t min_mtu; | |
56 | uint32_t max_mtu; | |
c65300b4 MT |
57 | |
58 | // Flags | |
59 | unsigned int flags; | |
69ef50c7 | 60 | uint8_t operstate; |
87a1e1e0 MT |
61 | }; |
62 | ||
2361667e | 63 | int nw_link_create(nw_link** link, nw_daemon* daemon, int ifindex) { |
87a1e1e0 | 64 | // Allocate a new object |
2361667e | 65 | nw_link* l = calloc(1, sizeof(*l)); |
87a1e1e0 MT |
66 | if (!l) |
67 | return 1; | |
68 | ||
69 | // Store a reference to the daemon | |
70 | l->daemon = nw_daemon_ref(daemon); | |
71 | ||
72 | // Initialize the reference counter | |
73 | l->nrefs = 1; | |
74 | ||
75 | // Store the ifindex | |
76 | l->ifindex = ifindex; | |
77 | ||
766f08ca MT |
78 | DEBUG("New link allocated (ifindex = %d)\n", l->ifindex); |
79 | ||
87a1e1e0 MT |
80 | *link = l; |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
2361667e | 85 | static void nw_link_free(nw_link* link) { |
766f08ca MT |
86 | DEBUG("Freeing link (ifindex = %d)\n", link->ifindex); |
87 | ||
87a1e1e0 MT |
88 | if (link->daemon) |
89 | nw_daemon_unref(link->daemon); | |
90 | } | |
91 | ||
2361667e | 92 | nw_link* nw_link_ref(nw_link* link) { |
87a1e1e0 MT |
93 | link->nrefs++; |
94 | ||
95 | return link; | |
96 | } | |
97 | ||
2361667e | 98 | nw_link* nw_link_unref(nw_link* link) { |
87a1e1e0 MT |
99 | if (--link->nrefs > 0) |
100 | return link; | |
101 | ||
102 | nw_link_free(link); | |
103 | return NULL; | |
104 | } | |
eaf649ee | 105 | |
371b836a MT |
106 | /* |
107 | This is a helper function for when we pass a reference to the event loop | |
108 | it will have to dereference the link instance later. | |
109 | */ | |
110 | static void __nw_link_unref(void* data) { | |
111 | nw_link* link = (nw_link*)data; | |
112 | ||
113 | nw_link_unref(link); | |
114 | } | |
115 | ||
2361667e | 116 | int nw_link_ifindex(nw_link* link) { |
766f08ca MT |
117 | return link->ifindex; |
118 | } | |
eaf649ee | 119 | |
207abe4e | 120 | const char* nw_link_ifname(nw_link* link) { |
611d4aca MT |
121 | // Return NULL if name isn't set |
122 | if (!*link->ifname) | |
123 | return NULL; | |
124 | ||
207abe4e MT |
125 | return link->ifname; |
126 | } | |
127 | ||
15240e08 MT |
128 | // Stats |
129 | ||
130 | const struct rtnl_link_stats64* nw_link_get_stats64(nw_link* link) { | |
131 | return &link->stats64; | |
132 | } | |
133 | ||
134 | static int nw_link_call_getlink(nw_link* link, | |
135 | int (*callback)(sd_netlink* rtnl, sd_netlink_message* m, void* data)) { | |
136 | sd_netlink_message* m = NULL; | |
137 | int r; | |
138 | ||
139 | sd_netlink* rtnl = nw_daemon_get_rtnl(link->daemon); | |
140 | if (!rtnl) | |
141 | return 1; | |
142 | ||
143 | // Create a new message | |
144 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, link->ifindex); | |
145 | if (r < 0) { | |
146 | ERROR("Could not allocate RTM_GETLINK message: %m\n"); | |
147 | goto ERROR; | |
148 | } | |
149 | ||
150 | // Send the message | |
151 | r = sd_netlink_call_async(rtnl, NULL, m, callback, | |
152 | __nw_link_unref, nw_link_ref(link), -1, NULL); | |
153 | if (r < 0) { | |
154 | ERROR("Could not send rtnetlink message: %m\n"); | |
155 | goto ERROR; | |
156 | } | |
157 | ||
158 | ERROR: | |
159 | if (m) | |
160 | sd_netlink_message_unref(m); | |
161 | ||
162 | return r; | |
163 | } | |
164 | ||
165 | static int __nw_link_update_stats(sd_netlink* rtnl, sd_netlink_message* m, void* data) { | |
166 | nw_link* link = (nw_link*)data; | |
167 | int r; | |
168 | ||
169 | // Fetch the stats | |
170 | r = sd_netlink_message_read(m, IFLA_STATS64, sizeof(link->stats64), &link->stats64); | |
171 | if (r < 0) | |
172 | return r; | |
173 | ||
174 | DEBUG("Link %d: Stats updated\n", link->ifindex); | |
175 | ||
176 | // Log stats | |
177 | DEBUG(" Packets : RX: %12llu, TX: %12llu\n", | |
178 | link->stats64.rx_packets, link->stats64.tx_packets); | |
179 | DEBUG(" Bytes : RX: %12llu, TX: %12llu\n", | |
180 | link->stats64.rx_bytes, link->stats64.tx_bytes); | |
181 | DEBUG(" Errors : RX: %12llu, TX: %12llu\n", | |
182 | link->stats64.rx_errors, link->stats64.tx_errors); | |
183 | DEBUG(" Dropped : RX: %12llu, TX: %12llu\n", | |
184 | link->stats64.rx_dropped, link->stats64.rx_dropped); | |
185 | DEBUG(" Multicast : %llu\n", link->stats64.multicast); | |
186 | DEBUG(" Collisions : %llu\n", link->stats64.collisions); | |
187 | ||
188 | // Notify ports that stats have been updated | |
189 | r = nw_daemon_ports_walk(link->daemon, __nw_port_update_stats, link); | |
190 | if (r) | |
191 | return r; | |
192 | ||
193 | // Notify zones that stats have been updated | |
194 | r = nw_daemon_zones_walk(link->daemon, __nw_zone_update_stats, link); | |
195 | if (r) | |
196 | return r; | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | int nw_link_update_stats(nw_link* link) { | |
202 | return nw_link_call_getlink(link, __nw_link_update_stats); | |
203 | } | |
204 | ||
dfd49c2c MT |
205 | // Carrier |
206 | ||
207 | int nw_link_has_carrier(nw_link* link) { | |
208 | return link->operstate == IF_OPER_UP; | |
209 | } | |
210 | ||
211 | static int nw_link_carrier_gained(nw_link* link) { | |
212 | return 0; // XXX TODO | |
213 | } | |
214 | ||
215 | static int nw_link_carrier_lost(nw_link* link) { | |
216 | return 0; // XXX TODO | |
217 | } | |
218 | ||
2361667e | 219 | static int nw_link_update_ifname(nw_link* link, sd_netlink_message* message) { |
f650f6cd MT |
220 | const char* ifname = NULL; |
221 | int r; | |
222 | ||
223 | r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname); | |
224 | if (r < 0) { | |
225 | ERROR("Could not read link name for link %d: %m\n", link->ifindex); | |
226 | return 1; | |
227 | } | |
228 | ||
229 | // Do nothing if the name is already set | |
230 | if (strcmp(link->ifname, ifname) == 0) | |
231 | return 0; | |
232 | ||
233 | // Otherwise update the name | |
234 | r = nw_string_set(link->ifname, ifname); | |
235 | if (r) { | |
236 | ERROR("Could not set link name: %m\n"); | |
237 | return 1; | |
238 | } | |
239 | ||
240 | DEBUG("Link %d has been renamed to '%s'\n", link->ifindex, link->ifname); | |
241 | ||
611d4aca MT |
242 | // Assign link to ports |
243 | nw_daemon_ports_walk(link->daemon, __nw_port_set_link, link); | |
244 | ||
245 | // Assign link to zones | |
246 | nw_daemon_zones_walk(link->daemon, __nw_zone_set_link, link); | |
247 | ||
f650f6cd MT |
248 | return 0; |
249 | } | |
250 | ||
2361667e | 251 | static int nw_link_update_mtu(nw_link* link, sd_netlink_message* message) { |
f37df5ea MT |
252 | uint32_t mtu = 0; |
253 | uint32_t min_mtu = 0; | |
254 | uint32_t max_mtu = 0; | |
255 | int r; | |
256 | ||
257 | // Read the MTU | |
258 | r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu); | |
259 | if (r < 0) { | |
260 | ERROR("Could not read MTU for link %d: %m\n", link->ifindex); | |
261 | return r; | |
262 | } | |
263 | ||
264 | // Read the minimum MTU | |
265 | r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu); | |
266 | if (r < 0) { | |
267 | ERROR("Could not read the minimum MTU for link %d: %m\n", link->ifindex); | |
268 | return r; | |
269 | } | |
270 | ||
271 | // Read the maximum MTU | |
272 | r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu); | |
273 | if (r < 0) { | |
274 | ERROR("Could not read the maximum MTU for link %d: %m\n", link->ifindex); | |
275 | return r; | |
276 | } | |
277 | ||
278 | // Set the maximum MTU to infinity | |
279 | if (!max_mtu) | |
280 | max_mtu = UINT32_MAX; | |
281 | ||
282 | // Store min/max MTU | |
283 | link->min_mtu = min_mtu; | |
284 | link->max_mtu = max_mtu; | |
285 | ||
286 | // End here, if the MTU has not been changed | |
287 | if (link->mtu == mtu) | |
288 | return 0; | |
289 | ||
290 | DEBUG("Link %d: MTU has changed to %" PRIu32 " (min: %" PRIu32 ", max: %" PRIu32 ")\n", | |
291 | link->ifindex, link->mtu, link->min_mtu, link->max_mtu); | |
292 | ||
293 | // Store MTU | |
294 | link->mtu = mtu; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
c65300b4 MT |
299 | static int nw_link_update_flags(nw_link* link, sd_netlink_message* message) { |
300 | unsigned int flags = 0; | |
69ef50c7 | 301 | uint8_t operstate = 0; |
c65300b4 MT |
302 | int r; |
303 | ||
304 | // Fetch flags | |
305 | r = sd_rtnl_message_link_get_flags(message, &flags); | |
306 | if (r < 0) { | |
1a70a686 | 307 | DEBUG("Could not read link flags: %m\n"); |
c65300b4 MT |
308 | return 1; |
309 | } | |
310 | ||
69ef50c7 MT |
311 | // Fetch operstate |
312 | r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate); | |
313 | if (r < 1) { | |
314 | ERROR("Could not read operstate: %m\n"); | |
315 | return 1; | |
316 | } | |
317 | ||
c65300b4 | 318 | // End here if there have been no changes |
69ef50c7 | 319 | if (link->flags == flags && link->operstate == operstate) |
c65300b4 MT |
320 | return 0; |
321 | ||
322 | // XXX We should log any changes here | |
323 | ||
dfd49c2c MT |
324 | // Fetch current carrier state |
325 | const int had_carrier = nw_link_has_carrier(link); | |
326 | ||
69ef50c7 | 327 | // Store the new flags & operstate |
c65300b4 | 328 | link->flags = flags; |
69ef50c7 MT |
329 | link->operstate = operstate; |
330 | ||
dfd49c2c MT |
331 | // Notify if carrier was gained or lost |
332 | if (!had_carrier && nw_link_has_carrier(link)) { | |
333 | r = nw_link_carrier_gained(link); | |
334 | if (r < 0) | |
335 | return r; | |
336 | ||
337 | } else if (had_carrier && !nw_link_has_carrier(link)) { | |
338 | r = nw_link_carrier_lost(link); | |
339 | if (r < 0) | |
340 | return r; | |
341 | } | |
c65300b4 MT |
342 | |
343 | return 0; | |
344 | } | |
345 | ||
f650f6cd MT |
346 | /* |
347 | This function is called whenever anything changes, so that we can | |
348 | update our internal link object. | |
349 | */ | |
2361667e | 350 | static int nw_link_update(nw_link* link, sd_netlink_message* message) { |
f650f6cd MT |
351 | int r; |
352 | ||
353 | // Update the interface name | |
354 | r = nw_link_update_ifname(link, message); | |
355 | if (r) | |
356 | return r; | |
357 | ||
f37df5ea MT |
358 | // Update the MTU |
359 | r = nw_link_update_mtu(link, message); | |
360 | if (r) | |
361 | return r; | |
362 | ||
c65300b4 MT |
363 | // Update flags |
364 | r = nw_link_update_flags(link, message); | |
365 | if (r) | |
366 | return r; | |
367 | ||
f650f6cd MT |
368 | return 0; |
369 | } | |
370 | ||
766f08ca | 371 | int nw_link_process(sd_netlink* rtnl, sd_netlink_message* message, void* data) { |
2361667e MT |
372 | nw_links* links = NULL; |
373 | nw_link* link = NULL; | |
766f08ca MT |
374 | const char* ifname = NULL; |
375 | int ifindex; | |
376 | uint16_t type; | |
377 | int r; | |
378 | ||
2361667e | 379 | nw_daemon* daemon = (nw_daemon*)data; |
766f08ca MT |
380 | |
381 | // Fetch links | |
382 | links = nw_daemon_links(daemon); | |
383 | if (!links) { | |
384 | r = 1; | |
385 | goto ERROR; | |
386 | } | |
387 | ||
388 | // Check if this message could be received | |
389 | if (sd_netlink_message_is_error(message)) { | |
390 | r = sd_netlink_message_get_errno(message); | |
391 | if (r < 0) | |
392 | ERROR("Could not receive link message: %m\n"); | |
393 | ||
394 | goto IGNORE; | |
395 | } | |
396 | ||
397 | // Fetch the message type | |
398 | r = sd_netlink_message_get_type(message, &type); | |
399 | if (r < 0) { | |
400 | ERROR("Could not fetch message type: %m\n"); | |
401 | goto IGNORE; | |
402 | } | |
403 | ||
404 | // Check type | |
405 | switch (type) { | |
406 | case RTM_NEWLINK: | |
407 | case RTM_DELLINK: | |
408 | break; | |
409 | ||
410 | default: | |
411 | ERROR("Received an unexpected message (type %u)\n", type); | |
412 | goto IGNORE; | |
413 | } | |
414 | ||
415 | // Fetch the interface index | |
416 | r = sd_rtnl_message_link_get_ifindex(message, &ifindex); | |
417 | if (r < 0) { | |
418 | ERROR("Could not fetch ifindex: %m\n"); | |
419 | goto IGNORE; | |
420 | } | |
421 | ||
422 | // Check interface index | |
423 | if (ifindex <= 0) { | |
424 | ERROR("Received an invalid ifindex\n"); | |
425 | goto IGNORE; | |
426 | } | |
427 | ||
428 | // Fetch the interface name | |
429 | r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname); | |
430 | if (r < 0) { | |
431 | ERROR("Received a netlink message without interface name: %m\n"); | |
432 | goto IGNORE; | |
433 | } | |
434 | ||
435 | // Try finding an existing link | |
436 | link = nw_daemon_get_link_by_ifindex(daemon, ifindex); | |
437 | ||
438 | switch (type) { | |
439 | case RTM_NEWLINK: | |
440 | // If the link doesn't exist, create it | |
441 | if (!link) { | |
442 | r = nw_link_create(&link, daemon, ifindex); | |
443 | if (r) { | |
444 | ERROR("Could not create link: %m\n"); | |
445 | goto ERROR; | |
446 | } | |
b8a1a68c MT |
447 | |
448 | // Add it to the list | |
449 | r = nw_links_add_link(links, link); | |
450 | if (r) | |
451 | goto ERROR; | |
766f08ca MT |
452 | } |
453 | ||
f650f6cd MT |
454 | // Import any data from the netlink message |
455 | r = nw_link_update(link, message); | |
456 | if (r) | |
457 | goto ERROR; | |
766f08ca | 458 | |
766f08ca MT |
459 | break; |
460 | ||
461 | case RTM_DELLINK: | |
462 | if (link) | |
463 | nw_links_drop_link(links, link); | |
464 | ||
465 | break; | |
466 | } | |
467 | ||
468 | IGNORE: | |
469 | r = 0; | |
470 | ||
471 | ERROR: | |
472 | if (links) | |
473 | nw_links_unref(links); | |
474 | if (link) | |
475 | nw_link_unref(link); | |
476 | ||
477 | return r; | |
eaf649ee | 478 | } |
371b836a MT |
479 | |
480 | static int __nw_link_destroy(sd_netlink* rtnl, sd_netlink_message* m, void* data) { | |
481 | nw_link* link = (nw_link*)data; | |
482 | int r; | |
483 | ||
484 | // Check if the operation was successful | |
485 | r = sd_netlink_message_get_errno(m); | |
486 | if (r < 0) { | |
487 | ERROR("Could not remove link %d: %m\n", link->ifindex); | |
488 | // XXX We should extract the error message | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | // Mark this link as destroyed | |
494 | link->state = NW_LINK_DESTROYED; | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | int nw_link_destroy(nw_link* link) { | |
500 | sd_netlink_message* m = NULL; | |
501 | int r; | |
502 | ||
503 | sd_netlink* rtnl = nw_daemon_get_rtnl(link->daemon); | |
504 | if (!rtnl) | |
505 | return 1; | |
506 | ||
507 | DEBUG("Destroying link %d\n", link->ifindex); | |
508 | ||
509 | // Create a new message | |
510 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, link->ifindex); | |
511 | if (r < 0) { | |
512 | ERROR("Could not allocate RTM_DELLINK message: %m\n"); | |
513 | goto ERROR; | |
514 | } | |
515 | ||
516 | // Send the message | |
517 | r = sd_netlink_call_async(rtnl, NULL, m, __nw_link_destroy, | |
518 | __nw_link_unref, nw_link_ref(link), -1, NULL); | |
519 | if (r < 0) { | |
520 | ERROR("Could not send rtnetlink message: %m\n"); | |
521 | goto ERROR; | |
522 | } | |
523 | ||
524 | ERROR: | |
525 | if (m) | |
526 | sd_netlink_message_unref(m); | |
527 | ||
528 | return r; | |
529 | } |