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[project/netifd.git] / system-linux.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
5 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2
9 * as published by the Free Software Foundation
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 #define _GNU_SOURCE
17
18 #include <sys/socket.h>
19 #include <sys/ioctl.h>
20 #include <sys/stat.h>
21 #include <sys/syscall.h>
22
23 #include <net/if.h>
24 #include <net/if_arp.h>
25
26 #include <arpa/inet.h>
27 #include <netinet/in.h>
28
29 #include <linux/rtnetlink.h>
30 #include <linux/sockios.h>
31 #include <linux/ip.h>
32 #include <linux/if_link.h>
33 #include <linux/if_vlan.h>
34 #include <linux/if_bridge.h>
35 #include <linux/if_tunnel.h>
36 #include <linux/ip6_tunnel.h>
37 #include <linux/ethtool.h>
38 #include <linux/fib_rules.h>
39
40 #ifndef RTN_FAILED_POLICY
41 #define RTN_FAILED_POLICY 12
42 #endif
43
44 #include <string.h>
45 #include <fcntl.h>
46 #include <glob.h>
47 #include <time.h>
48
49 #include <netlink/msg.h>
50 #include <netlink/attr.h>
51 #include <netlink/socket.h>
52 #include <libubox/uloop.h>
53
54 #include "netifd.h"
55 #include "device.h"
56 #include "system.h"
57
58 struct event_socket {
59 struct uloop_fd uloop;
60 struct nl_sock *sock;
61 struct nl_cb *cb;
62 };
63
64 static int sock_ioctl = -1;
65 static struct nl_sock *sock_rtnl = NULL;
66
67 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
68 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
69
70 static char dev_buf[256];
71
72 static void
73 handler_nl_event(struct uloop_fd *u, unsigned int events)
74 {
75 struct event_socket *ev = container_of(u, struct event_socket, uloop);
76 nl_recvmsgs(ev->sock, ev->cb);
77 }
78
79 static struct nl_sock *
80 create_socket(int protocol, int groups)
81 {
82 struct nl_sock *sock;
83
84 sock = nl_socket_alloc();
85 if (!sock)
86 return NULL;
87
88 if (groups)
89 nl_join_groups(sock, groups);
90
91 if (nl_connect(sock, protocol))
92 return NULL;
93
94 return sock;
95 }
96
97 static bool
98 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
99 uloop_fd_handler cb)
100 {
101 ev->sock = create_socket(protocol, groups);
102 if (!ev->sock)
103 return false;
104
105 ev->uloop.fd = nl_socket_get_fd(ev->sock);
106 ev->uloop.cb = cb;
107 uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
108 return true;
109 }
110
111 static bool
112 create_event_socket(struct event_socket *ev, int protocol,
113 int (*cb)(struct nl_msg *msg, void *arg))
114 {
115 // Prepare socket for link events
116 ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
117 if (!ev->cb)
118 return false;
119
120 nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
121
122 return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
123 }
124
125 int system_init(void)
126 {
127 static struct event_socket rtnl_event;
128 static struct event_socket hotplug_event;
129
130 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
131 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
132
133 // Prepare socket for routing / address control
134 sock_rtnl = create_socket(NETLINK_ROUTE, 0);
135 if (!sock_rtnl)
136 return -1;
137
138 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
139 return -1;
140
141 if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
142 handle_hotplug_event))
143 return -1;
144
145 // Receive network link events form kernel
146 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
147
148 return 0;
149 }
150
151 static void system_set_sysctl(const char *path, const char *val)
152 {
153 int fd;
154
155 fd = open(path, O_WRONLY);
156 if (fd < 0)
157 return;
158
159 if (write(fd, val, strlen(val))) {}
160 close(fd);
161 }
162
163 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
164 {
165 snprintf(dev_buf, sizeof(dev_buf), path, device);
166 system_set_sysctl(dev_buf, val);
167 }
168
169 static void system_set_disable_ipv6(struct device *dev, const char *val)
170 {
171 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
172 }
173
174 // Evaluate netlink messages
175 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
176 {
177 struct nlmsghdr *nh = nlmsg_hdr(msg);
178 struct ifinfomsg *ifi = NLMSG_DATA(nh);
179 struct nlattr *nla[__IFLA_MAX];
180
181 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
182 goto out;
183
184 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
185 if (!nla[IFLA_IFNAME])
186 goto out;
187
188 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
189 if (!dev)
190 goto out;
191
192 dev->ifindex = ifi->ifi_index;
193 /* TODO: parse link status */
194
195 out:
196 return 0;
197 }
198
199 static void
200 handle_hotplug_msg(char *data, int size)
201 {
202 const char *subsystem = NULL, *interface = NULL;
203 char *cur, *end, *sep;
204 struct device *dev;
205 int skip;
206 bool add;
207
208 if (!strncmp(data, "add@", 4))
209 add = true;
210 else if (!strncmp(data, "remove@", 7))
211 add = false;
212 else
213 return;
214
215 skip = strlen(data) + 1;
216 end = data + size;
217
218 for (cur = data + skip; cur < end; cur += skip) {
219 skip = strlen(cur) + 1;
220
221 sep = strchr(cur, '=');
222 if (!sep)
223 continue;
224
225 *sep = 0;
226 if (!strcmp(cur, "INTERFACE"))
227 interface = sep + 1;
228 else if (!strcmp(cur, "SUBSYSTEM")) {
229 subsystem = sep + 1;
230 if (strcmp(subsystem, "net") != 0)
231 return;
232 }
233 if (subsystem && interface)
234 goto found;
235 }
236 return;
237
238 found:
239 dev = device_get(interface, false);
240 if (!dev)
241 return;
242
243 if (dev->type != &simple_device_type)
244 return;
245
246 if (add && system_if_force_external(dev->ifname))
247 return;
248
249 device_set_present(dev, add);
250 }
251
252 static void
253 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
254 {
255 struct event_socket *ev = container_of(u, struct event_socket, uloop);
256 struct sockaddr_nl nla;
257 unsigned char *buf = NULL;
258 int size;
259
260 while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
261 if (nla.nl_pid == 0)
262 handle_hotplug_msg((char *) buf, size);
263
264 free(buf);
265 }
266 }
267
268 static int system_rtnl_call(struct nl_msg *msg)
269 {
270 int ret;
271
272 ret = nl_send_auto_complete(sock_rtnl, msg);
273 nlmsg_free(msg);
274
275 if (ret < 0)
276 return ret;
277
278 return nl_wait_for_ack(sock_rtnl);
279 }
280
281 int system_bridge_delbr(struct device *bridge)
282 {
283 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
284 }
285
286 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
287 {
288 struct ifreq ifr;
289
290 memset(&ifr, 0, sizeof(ifr));
291 if (dev)
292 ifr.ifr_ifindex = dev->ifindex;
293 else
294 ifr.ifr_data = data;
295 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
296 return ioctl(sock_ioctl, cmd, &ifr);
297 }
298
299 static bool system_is_bridge(const char *name, char *buf, int buflen)
300 {
301 struct stat st;
302
303 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
304 if (stat(buf, &st) < 0)
305 return false;
306
307 return true;
308 }
309
310 static char *system_get_bridge(const char *name, char *buf, int buflen)
311 {
312 char *path;
313 ssize_t len;
314 glob_t gl;
315
316 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
317 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
318 return NULL;
319
320 if (gl.gl_pathc == 0)
321 return NULL;
322
323 len = readlink(gl.gl_pathv[0], buf, buflen);
324 if (len < 0)
325 return NULL;
326
327 buf[len] = 0;
328 path = strrchr(buf, '/');
329 if (!path)
330 return NULL;
331
332 return path + 1;
333 }
334
335 int system_bridge_addif(struct device *bridge, struct device *dev)
336 {
337 char *oldbr;
338
339 system_set_disable_ipv6(dev, "1");
340 oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
341 if (oldbr && !strcmp(oldbr, bridge->ifname))
342 return 0;
343
344 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
345 }
346
347 int system_bridge_delif(struct device *bridge, struct device *dev)
348 {
349 system_set_disable_ipv6(dev, "0");
350 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
351 }
352
353 static int system_if_resolve(struct device *dev)
354 {
355 struct ifreq ifr;
356 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
357 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
358 return ifr.ifr_ifindex;
359 else
360 return 0;
361 }
362
363 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
364 {
365 struct ifreq ifr;
366
367 memset(&ifr, 0, sizeof(ifr));
368 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
369 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
370 ifr.ifr_flags |= add;
371 ifr.ifr_flags &= ~rem;
372 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
373 }
374
375 struct clear_data {
376 struct nl_msg *msg;
377 struct device *dev;
378 int type;
379 int size;
380 int af;
381 };
382
383
384 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
385 {
386 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
387
388 return ifa->ifa_index == ifindex;
389 }
390
391 static bool check_route(struct nlmsghdr *hdr, int ifindex)
392 {
393 struct rtmsg *r = NLMSG_DATA(hdr);
394 struct nlattr *tb[__RTA_MAX];
395
396 if (r->rtm_protocol == RTPROT_KERNEL &&
397 r->rtm_family == AF_INET6)
398 return false;
399
400 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
401 if (!tb[RTA_OIF])
402 return false;
403
404 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
405 }
406
407 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
408 {
409 return true;
410 }
411
412 static int cb_clear_event(struct nl_msg *msg, void *arg)
413 {
414 struct clear_data *clr = arg;
415 struct nlmsghdr *hdr = nlmsg_hdr(msg);
416 bool (*cb)(struct nlmsghdr *, int ifindex);
417 int type;
418
419 switch(clr->type) {
420 case RTM_GETADDR:
421 type = RTM_DELADDR;
422 if (hdr->nlmsg_type != RTM_NEWADDR)
423 return NL_SKIP;
424
425 cb = check_ifaddr;
426 break;
427 case RTM_GETROUTE:
428 type = RTM_DELROUTE;
429 if (hdr->nlmsg_type != RTM_NEWROUTE)
430 return NL_SKIP;
431
432 cb = check_route;
433 break;
434 case RTM_GETRULE:
435 type = RTM_DELRULE;
436 if (hdr->nlmsg_type != RTM_NEWRULE)
437 return NL_SKIP;
438
439 cb = check_rule;
440 break;
441 default:
442 return NL_SKIP;
443 }
444
445 if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
446 return NL_SKIP;
447
448 if (type == RTM_DELRULE)
449 D(SYSTEM, "Remove a rule\n");
450 else
451 D(SYSTEM, "Remove %s from device %s\n",
452 type == RTM_DELADDR ? "an address" : "a route",
453 clr->dev->ifname);
454 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
455 hdr = nlmsg_hdr(clr->msg);
456 hdr->nlmsg_type = type;
457 hdr->nlmsg_flags = NLM_F_REQUEST;
458
459 nl_socket_disable_auto_ack(sock_rtnl);
460 nl_send_auto_complete(sock_rtnl, clr->msg);
461 nl_socket_enable_auto_ack(sock_rtnl);
462
463 return NL_SKIP;
464 }
465
466 static int
467 cb_finish_event(struct nl_msg *msg, void *arg)
468 {
469 int *pending = arg;
470 *pending = 0;
471 return NL_STOP;
472 }
473
474 static int
475 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
476 {
477 int *pending = arg;
478 *pending = err->error;
479 return NL_STOP;
480 }
481
482 static void
483 system_if_clear_entries(struct device *dev, int type, int af)
484 {
485 struct clear_data clr;
486 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
487 struct rtmsg rtm = {
488 .rtm_family = af,
489 .rtm_flags = RTM_F_CLONED,
490 };
491 int flags = NLM_F_DUMP;
492 int pending = 1;
493
494 clr.af = af;
495 clr.dev = dev;
496 clr.type = type;
497 switch (type) {
498 case RTM_GETADDR:
499 case RTM_GETRULE:
500 clr.size = sizeof(struct rtgenmsg);
501 break;
502 case RTM_GETROUTE:
503 clr.size = sizeof(struct rtmsg);
504 break;
505 default:
506 return;
507 }
508
509 if (!cb)
510 return;
511
512 clr.msg = nlmsg_alloc_simple(type, flags);
513 if (!clr.msg)
514 goto out;
515
516 nlmsg_append(clr.msg, &rtm, clr.size, 0);
517 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
518 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
519 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
520
521 nl_send_auto_complete(sock_rtnl, clr.msg);
522 while (pending > 0)
523 nl_recvmsgs(sock_rtnl, cb);
524
525 nlmsg_free(clr.msg);
526 out:
527 nl_cb_put(cb);
528 }
529
530 /*
531 * Clear bridge (membership) state and bring down device
532 */
533 void system_if_clear_state(struct device *dev)
534 {
535 static char buf[256];
536 char *bridge;
537
538 if (dev->external)
539 return;
540
541 dev->ifindex = system_if_resolve(dev);
542 if (!dev->ifindex)
543 return;
544
545 system_if_flags(dev->ifname, 0, IFF_UP);
546
547 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
548 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
549 system_bridge_delbr(dev);
550 return;
551 }
552
553 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
554 if (bridge) {
555 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
556 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
557 }
558
559 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
560 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
561 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
562 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
563 system_set_disable_ipv6(dev, "0");
564 }
565
566 static inline unsigned long
567 sec_to_jiffies(int val)
568 {
569 return (unsigned long) val * 100;
570 }
571
572 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
573 {
574 unsigned long args[4] = {};
575
576 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
577 return -1;
578
579 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
580 args[1] = !!cfg->stp;
581 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
582
583 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
584 args[1] = sec_to_jiffies(cfg->forward_delay);
585 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
586
587 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
588 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
589
590 args[0] = BRCTL_SET_BRIDGE_PRIORITY;
591 args[1] = cfg->priority;
592 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
593
594 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
595 args[0] = BRCTL_SET_AGEING_TIME;
596 args[1] = sec_to_jiffies(cfg->ageing_time);
597 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
598 }
599
600 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
601 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
602 args[1] = sec_to_jiffies(cfg->hello_time);
603 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
604 }
605
606 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
607 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
608 args[1] = sec_to_jiffies(cfg->max_age);
609 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
610 }
611
612 return 0;
613 }
614
615 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
616 {
617 struct nl_msg *msg;
618 struct nlattr *linkinfo, *data;
619 struct ifinfomsg iim = { .ifi_family = AF_INET };
620 int ifindex = system_if_resolve(dev);
621 int i, rv;
622 static const struct {
623 const char *name;
624 enum macvlan_mode val;
625 } modes[] = {
626 { "private", MACVLAN_MODE_PRIVATE },
627 { "vepa", MACVLAN_MODE_VEPA },
628 { "bridge", MACVLAN_MODE_BRIDGE },
629 { "passthru", MACVLAN_MODE_PASSTHRU },
630 };
631
632 if (ifindex == 0)
633 return -ENOENT;
634
635 msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
636
637 if (!msg)
638 return -1;
639
640 nlmsg_append(msg, &iim, sizeof(iim), 0);
641
642 if (cfg->flags & MACVLAN_OPT_MACADDR)
643 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
644 nla_put(msg, IFLA_IFNAME, IFNAMSIZ, macvlan->ifname);
645 nla_put_u32(msg, IFLA_LINK, ifindex);
646
647 if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
648 goto nla_put_failure;
649
650 nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan");
651
652 if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
653 goto nla_put_failure;
654
655 if (cfg->mode) {
656 for (i = 0; i < ARRAY_SIZE(modes); i++) {
657 if (strcmp(cfg->mode, modes[i].name) != 0)
658 continue;
659
660 nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
661 break;
662 }
663 }
664
665 nla_nest_end(msg, data);
666 nla_nest_end(msg, linkinfo);
667
668 rv = system_rtnl_call(msg);
669 if (rv)
670 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
671
672 return rv;
673
674 nla_put_failure:
675 nlmsg_free(msg);
676 return -ENOMEM;
677 }
678
679 int system_macvlan_del(struct device *macvlan)
680 {
681 struct nl_msg *msg;
682 struct ifinfomsg iim;
683
684 iim.ifi_family = AF_INET;
685 iim.ifi_index = 0;
686
687 msg = nlmsg_alloc_simple(RTM_DELLINK, 0);
688
689 if (!msg)
690 return -1;
691
692 nlmsg_append(msg, &iim, sizeof(iim), 0);
693
694 nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan");
695 nla_put(msg, IFLA_IFNAME, sizeof(macvlan->ifname), macvlan->ifname);
696
697 system_rtnl_call(msg);
698
699 return 0;
700 }
701
702 static int system_vlan(struct device *dev, int id)
703 {
704 struct vlan_ioctl_args ifr = {
705 .cmd = SET_VLAN_NAME_TYPE_CMD,
706 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
707 };
708
709 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
710
711 if (id < 0) {
712 ifr.cmd = DEL_VLAN_CMD;
713 ifr.u.VID = 0;
714 } else {
715 ifr.cmd = ADD_VLAN_CMD;
716 ifr.u.VID = id;
717 }
718 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
719 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
720 }
721
722 int system_vlan_add(struct device *dev, int id)
723 {
724 return system_vlan(dev, id);
725 }
726
727 int system_vlan_del(struct device *dev)
728 {
729 return system_vlan(dev, -1);
730 }
731
732 static void
733 system_if_get_settings(struct device *dev, struct device_settings *s)
734 {
735 struct ifreq ifr;
736
737 memset(&ifr, 0, sizeof(ifr));
738 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
739
740 if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
741 s->mtu = ifr.ifr_mtu;
742 s->flags |= DEV_OPT_MTU;
743 }
744
745 if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
746 s->txqueuelen = ifr.ifr_qlen;
747 s->flags |= DEV_OPT_TXQUEUELEN;
748 }
749
750 if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
751 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
752 s->flags |= DEV_OPT_MACADDR;
753 }
754 }
755
756 void
757 system_if_apply_settings(struct device *dev, struct device_settings *s)
758 {
759 struct ifreq ifr;
760
761 memset(&ifr, 0, sizeof(ifr));
762 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
763 if (s->flags & DEV_OPT_MTU) {
764 ifr.ifr_mtu = s->mtu;
765 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
766 s->flags &= ~DEV_OPT_MTU;
767 }
768 if (s->flags & DEV_OPT_TXQUEUELEN) {
769 ifr.ifr_qlen = s->txqueuelen;
770 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
771 s->flags &= ~DEV_OPT_TXQUEUELEN;
772 }
773 if ((s->flags & DEV_OPT_MACADDR) && !dev->external) {
774 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
775 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
776 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
777 s->flags &= ~DEV_OPT_MACADDR;
778 }
779 }
780
781 int system_if_up(struct device *dev)
782 {
783 system_if_get_settings(dev, &dev->orig_settings);
784 system_if_apply_settings(dev, &dev->settings);
785 dev->ifindex = system_if_resolve(dev);
786 return system_if_flags(dev->ifname, IFF_UP, 0);
787 }
788
789 int system_if_down(struct device *dev)
790 {
791 int ret = system_if_flags(dev->ifname, 0, IFF_UP);
792 dev->orig_settings.flags &= dev->settings.flags;
793 system_if_apply_settings(dev, &dev->orig_settings);
794 return ret;
795 }
796
797 int system_if_check(struct device *dev)
798 {
799 device_set_present(dev, (system_if_resolve(dev) > 0));
800 return 0;
801 }
802
803 struct device *
804 system_if_get_parent(struct device *dev)
805 {
806 char buf[64], *devname;
807 int ifindex, iflink, len;
808 FILE *f;
809
810 snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
811 f = fopen(buf, "r");
812 if (!f)
813 return NULL;
814
815 len = fread(buf, 1, sizeof(buf) - 1, f);
816 fclose(f);
817
818 if (len <= 0)
819 return NULL;
820
821 buf[len] = 0;
822 iflink = strtoul(buf, NULL, 0);
823 ifindex = system_if_resolve(dev);
824 if (!iflink || iflink == ifindex)
825 return NULL;
826
827 devname = if_indextoname(iflink, buf);
828 if (!devname)
829 return NULL;
830
831 return device_get(devname, true);
832 }
833
834 static bool
835 read_string_file(int dir_fd, const char *file, char *buf, int len)
836 {
837 bool ret = false;
838 char *c;
839 int fd;
840
841 fd = openat(dir_fd, file, O_RDONLY);
842 if (fd < 0)
843 return false;
844
845 retry:
846 len = read(fd, buf, len - 1);
847 if (len < 0) {
848 if (errno == EINTR)
849 goto retry;
850 } else if (len > 0) {
851 buf[len] = 0;
852
853 c = strchr(buf, '\n');
854 if (c)
855 *c = 0;
856
857 ret = true;
858 }
859
860 close(fd);
861
862 return ret;
863 }
864
865 static bool
866 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
867 {
868 char buf[64];
869 bool ret = false;
870
871 ret = read_string_file(dir_fd, file, buf, sizeof(buf));
872 if (ret)
873 *val = strtoull(buf, NULL, 0);
874
875 return ret;
876 }
877
878 /* Assume advertised flags == supported flags */
879 static const struct {
880 uint32_t mask;
881 const char *name;
882 } ethtool_link_modes[] = {
883 { ADVERTISED_10baseT_Half, "10H" },
884 { ADVERTISED_10baseT_Full, "10F" },
885 { ADVERTISED_100baseT_Half, "100H" },
886 { ADVERTISED_100baseT_Full, "100F" },
887 { ADVERTISED_1000baseT_Half, "1000H" },
888 { ADVERTISED_1000baseT_Full, "1000F" },
889 };
890
891 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
892 {
893 int i;
894 for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
895 if (mask & ethtool_link_modes[i].mask)
896 blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
897 }
898 }
899
900 bool
901 system_if_force_external(const char *ifname)
902 {
903 char buf[64];
904 struct stat s;
905
906 snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
907 return stat(buf, &s) == 0;
908 }
909
910 int
911 system_if_dump_info(struct device *dev, struct blob_buf *b)
912 {
913 struct ethtool_cmd ecmd;
914 struct ifreq ifr;
915 char buf[64], *s;
916 void *c;
917 int dir_fd;
918 uint64_t val = 0;
919
920 snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
921 dir_fd = open(buf, O_DIRECTORY);
922
923 if (read_uint64_file(dir_fd, "carrier", &val))
924 blobmsg_add_u8(b, "link", !!val);
925
926 memset(&ecmd, 0, sizeof(ecmd));
927 memset(&ifr, 0, sizeof(ifr));
928 strcpy(ifr.ifr_name, dev->ifname);
929 ifr.ifr_data = (caddr_t) &ecmd;
930 ecmd.cmd = ETHTOOL_GSET;
931
932 if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
933 c = blobmsg_open_array(b, "link-advertising");
934 system_add_link_modes(b, ecmd.advertising);
935 blobmsg_close_array(b, c);
936
937 c = blobmsg_open_array(b, "link-supported");
938 system_add_link_modes(b, ecmd.supported);
939 blobmsg_close_array(b, c);
940
941 s = blobmsg_alloc_string_buffer(b, "speed", 8);
942 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
943 ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
944 blobmsg_add_string_buffer(b);
945 }
946
947 close(dir_fd);
948 return 0;
949 }
950
951 int
952 system_if_dump_stats(struct device *dev, struct blob_buf *b)
953 {
954 const char *const counters[] = {
955 "collisions", "rx_frame_errors", "tx_compressed",
956 "multicast", "rx_length_errors", "tx_dropped",
957 "rx_bytes", "rx_missed_errors", "tx_errors",
958 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
959 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
960 "rx_dropped", "tx_aborted_errors", "tx_packets",
961 "rx_errors", "tx_bytes", "tx_window_errors",
962 "rx_fifo_errors", "tx_carrier_errors",
963 };
964 char buf[64];
965 int stats_dir;
966 int i;
967 uint64_t val = 0;
968
969 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
970 stats_dir = open(buf, O_DIRECTORY);
971 if (stats_dir < 0)
972 return -1;
973
974 for (i = 0; i < ARRAY_SIZE(counters); i++)
975 if (read_uint64_file(stats_dir, counters[i], &val))
976 blobmsg_add_u64(b, counters[i], val);
977
978 close(stats_dir);
979 return 0;
980 }
981
982 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
983 {
984 bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
985 int alen = v4 ? 4 : 16;
986 unsigned int flags = 0;
987 struct ifaddrmsg ifa = {
988 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
989 .ifa_prefixlen = addr->mask,
990 .ifa_index = dev->ifindex,
991 };
992
993 struct nl_msg *msg;
994 if (cmd == RTM_NEWADDR)
995 flags |= NLM_F_CREATE | NLM_F_REPLACE;
996
997 msg = nlmsg_alloc_simple(cmd, flags);
998 if (!msg)
999 return -1;
1000
1001 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1002 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1003 if (v4) {
1004 if (addr->broadcast)
1005 nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1006 if (addr->point_to_point)
1007 nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1008 } else {
1009 time_t now = system_get_rtime();
1010 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1011
1012 if (addr->preferred_until) {
1013 int64_t preferred = addr->preferred_until - now;
1014 if (preferred < 0)
1015 preferred = 0;
1016 else if (preferred > UINT32_MAX)
1017 preferred = UINT32_MAX;
1018
1019 cinfo.ifa_prefered = preferred;
1020 }
1021
1022 if (addr->valid_until) {
1023 int64_t valid = addr->valid_until - now;
1024 if (valid <= 0)
1025 return -1;
1026 else if (valid > UINT32_MAX)
1027 valid = UINT32_MAX;
1028
1029 cinfo.ifa_valid = valid;
1030 }
1031
1032 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1033 }
1034
1035 return system_rtnl_call(msg);
1036 }
1037
1038 int system_add_address(struct device *dev, struct device_addr *addr)
1039 {
1040 return system_addr(dev, addr, RTM_NEWADDR);
1041 }
1042
1043 int system_del_address(struct device *dev, struct device_addr *addr)
1044 {
1045 return system_addr(dev, addr, RTM_DELADDR);
1046 }
1047
1048 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1049 {
1050 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1051 bool have_gw;
1052 unsigned int flags = 0;
1053
1054 if (alen == 4)
1055 have_gw = !!route->nexthop.in.s_addr;
1056 else
1057 have_gw = route->nexthop.in6.s6_addr32[0] ||
1058 route->nexthop.in6.s6_addr32[1] ||
1059 route->nexthop.in6.s6_addr32[2] ||
1060 route->nexthop.in6.s6_addr32[3];
1061
1062 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
1063 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1064
1065 unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1066 ? route->table : RT_TABLE_MAIN;
1067
1068 struct rtmsg rtm = {
1069 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1070 .rtm_dst_len = route->mask,
1071 .rtm_src_len = route->sourcemask,
1072 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1073 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
1074 .rtm_scope = scope,
1075 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1076 };
1077 struct nl_msg *msg;
1078
1079 if (cmd == RTM_NEWROUTE) {
1080 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1081
1082 if (!dev) { // Add null-route
1083 rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1084 rtm.rtm_type = RTN_UNREACHABLE;
1085 }
1086 }
1087
1088 msg = nlmsg_alloc_simple(cmd, flags);
1089 if (!msg)
1090 return -1;
1091
1092 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1093
1094 if (route->mask)
1095 nla_put(msg, RTA_DST, alen, &route->addr);
1096
1097 if (route->sourcemask)
1098 nla_put(msg, RTA_SRC, alen, &route->source);
1099
1100 if (route->metric > 0)
1101 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1102
1103 if (have_gw)
1104 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1105
1106 if (dev)
1107 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1108
1109 if (table >= 256)
1110 nla_put_u32(msg, RTA_TABLE, table);
1111
1112 return system_rtnl_call(msg);
1113 }
1114
1115 int system_add_route(struct device *dev, struct device_route *route)
1116 {
1117 return system_rt(dev, route, RTM_NEWROUTE);
1118 }
1119
1120 int system_del_route(struct device *dev, struct device_route *route)
1121 {
1122 return system_rt(dev, route, RTM_DELROUTE);
1123 }
1124
1125 int system_flush_routes(void)
1126 {
1127 const char *names[] = {
1128 "/proc/sys/net/ipv4/route/flush",
1129 "/proc/sys/net/ipv6/route/flush"
1130 };
1131 int fd, i;
1132
1133 for (i = 0; i < ARRAY_SIZE(names); i++) {
1134 fd = open(names[i], O_WRONLY);
1135 if (fd < 0)
1136 continue;
1137
1138 if (write(fd, "-1", 2)) {}
1139 close(fd);
1140 }
1141 return 0;
1142 }
1143
1144 bool system_resolve_rt_table(const char *name, unsigned int *id)
1145 {
1146 FILE *f;
1147 char *e, buf[128];
1148 unsigned int n, table = RT_TABLE_UNSPEC;
1149
1150 /* first try to parse table as number */
1151 if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1152 table = n;
1153
1154 /* handle well known aliases */
1155 else if (!strcmp(name, "default"))
1156 table = RT_TABLE_DEFAULT;
1157 else if (!strcmp(name, "main"))
1158 table = RT_TABLE_MAIN;
1159 else if (!strcmp(name, "local"))
1160 table = RT_TABLE_LOCAL;
1161
1162 /* try to look up name in /etc/iproute2/rt_tables */
1163 else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1164 {
1165 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1166 {
1167 if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1168 continue;
1169
1170 n = strtoul(e, NULL, 10);
1171 e = strtok(NULL, " \t\n");
1172
1173 if (e && !strcmp(e, name))
1174 {
1175 table = n;
1176 break;
1177 }
1178 }
1179
1180 fclose(f);
1181 }
1182
1183 if (table == RT_TABLE_UNSPEC)
1184 return false;
1185
1186 /* do not consider main table special */
1187 if (table == RT_TABLE_MAIN)
1188 table = RT_TABLE_UNSPEC;
1189
1190 *id = table;
1191 return true;
1192 }
1193
1194 static int system_iprule(struct iprule *rule, int cmd)
1195 {
1196 int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1197
1198 struct nl_msg *msg;
1199 struct rtmsg rtm = {
1200 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1201 .rtm_protocol = RTPROT_STATIC,
1202 .rtm_scope = RT_SCOPE_UNIVERSE,
1203 .rtm_table = RT_TABLE_UNSPEC,
1204 .rtm_type = RTN_UNSPEC,
1205 .rtm_flags = 0,
1206 };
1207
1208 if (cmd == RTM_NEWRULE) {
1209 rtm.rtm_type = RTN_UNICAST;
1210 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1211 }
1212
1213 if (rule->invert)
1214 rtm.rtm_flags |= FIB_RULE_INVERT;
1215
1216 if (rule->flags & IPRULE_SRC)
1217 rtm.rtm_src_len = rule->src_mask;
1218
1219 if (rule->flags & IPRULE_DEST)
1220 rtm.rtm_dst_len = rule->dest_mask;
1221
1222 if (rule->flags & IPRULE_TOS)
1223 rtm.rtm_tos = rule->tos;
1224
1225 if (rule->flags & IPRULE_LOOKUP) {
1226 if (rule->lookup < 256)
1227 rtm.rtm_table = rule->lookup;
1228 }
1229
1230 if (rule->flags & IPRULE_ACTION)
1231 rtm.rtm_type = rule->action;
1232 else if (rule->flags & IPRULE_GOTO)
1233 rtm.rtm_type = FR_ACT_GOTO;
1234 else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1235 rtm.rtm_type = FR_ACT_NOP;
1236
1237 msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1238
1239 if (!msg)
1240 return -1;
1241
1242 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1243
1244 if (rule->flags & IPRULE_IN)
1245 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1246
1247 if (rule->flags & IPRULE_OUT)
1248 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1249
1250 if (rule->flags & IPRULE_SRC)
1251 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1252
1253 if (rule->flags & IPRULE_DEST)
1254 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1255
1256 if (rule->flags & IPRULE_PRIORITY)
1257 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1258 else if (cmd == RTM_NEWRULE)
1259 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1260
1261 if (rule->flags & IPRULE_FWMARK)
1262 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1263
1264 if (rule->flags & IPRULE_FWMASK)
1265 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1266
1267 if (rule->flags & IPRULE_LOOKUP) {
1268 if (rule->lookup >= 256)
1269 nla_put_u32(msg, FRA_TABLE, rule->lookup);
1270 }
1271
1272 if (rule->flags & IPRULE_GOTO)
1273 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1274
1275 return system_rtnl_call(msg);
1276 }
1277
1278 int system_add_iprule(struct iprule *rule)
1279 {
1280 return system_iprule(rule, RTM_NEWRULE);
1281 }
1282
1283 int system_del_iprule(struct iprule *rule)
1284 {
1285 return system_iprule(rule, RTM_DELRULE);
1286 }
1287
1288 int system_flush_iprules(void)
1289 {
1290 int rv = 0;
1291 struct iprule rule;
1292
1293 system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1294 system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1295
1296 memset(&rule, 0, sizeof(rule));
1297
1298
1299 rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1300
1301 rule.priority = 0;
1302 rule.lookup = RT_TABLE_LOCAL;
1303 rv |= system_iprule(&rule, RTM_NEWRULE);
1304
1305 rule.priority = 32766;
1306 rule.lookup = RT_TABLE_MAIN;
1307 rv |= system_iprule(&rule, RTM_NEWRULE);
1308
1309 rule.priority = 32767;
1310 rule.lookup = RT_TABLE_DEFAULT;
1311 rv |= system_iprule(&rule, RTM_NEWRULE);
1312
1313
1314 rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1315
1316 rule.priority = 0;
1317 rule.lookup = RT_TABLE_LOCAL;
1318 rv |= system_iprule(&rule, RTM_NEWRULE);
1319
1320 rule.priority = 32766;
1321 rule.lookup = RT_TABLE_MAIN;
1322 rv |= system_iprule(&rule, RTM_NEWRULE);
1323
1324 return rv;
1325 }
1326
1327 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1328 {
1329 char *e;
1330 unsigned int n;
1331
1332 if (!strcmp(action, "local"))
1333 n = RTN_LOCAL;
1334 else if (!strcmp(action, "nat"))
1335 n = RTN_NAT;
1336 else if (!strcmp(action, "broadcast"))
1337 n = RTN_BROADCAST;
1338 else if (!strcmp(action, "anycast"))
1339 n = RTN_ANYCAST;
1340 else if (!strcmp(action, "multicast"))
1341 n = RTN_MULTICAST;
1342 else if (!strcmp(action, "prohibit"))
1343 n = RTN_PROHIBIT;
1344 else if (!strcmp(action, "unreachable"))
1345 n = RTN_UNREACHABLE;
1346 else if (!strcmp(action, "blackhole"))
1347 n = RTN_BLACKHOLE;
1348 else if (!strcmp(action, "xresolve"))
1349 n = RTN_XRESOLVE;
1350 else if (!strcmp(action, "unicast"))
1351 n = RTN_UNICAST;
1352 else if (!strcmp(action, "throw"))
1353 n = RTN_THROW;
1354 else if (!strcmp(action, "failed_policy"))
1355 n = RTN_FAILED_POLICY;
1356 else {
1357 n = strtoul(action, &e, 0);
1358 if (!e || *e || e == action || n > 255)
1359 return false;
1360 }
1361
1362 *id = n;
1363 return true;
1364 }
1365
1366 time_t system_get_rtime(void)
1367 {
1368 struct timespec ts;
1369 struct timeval tv;
1370
1371 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1372 return ts.tv_sec;
1373
1374 if (gettimeofday(&tv, NULL) == 0)
1375 return tv.tv_sec;
1376
1377 return 0;
1378 }
1379
1380 #ifndef IP_DF
1381 #define IP_DF 0x4000
1382 #endif
1383
1384 static int tunnel_ioctl(const char *name, int cmd, void *p)
1385 {
1386 struct ifreq ifr;
1387
1388 memset(&ifr, 0, sizeof(ifr));
1389 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1390 ifr.ifr_ifru.ifru_data = p;
1391 return ioctl(sock_ioctl, cmd, &ifr);
1392 }
1393
1394 int system_del_ip_tunnel(const char *name)
1395 {
1396 return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
1397 }
1398
1399 int system_update_ipv6_mtu(struct device *dev, int mtu)
1400 {
1401 int ret = -1;
1402 char buf[64];
1403 snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
1404 dev->ifname);
1405
1406 int fd = open(buf, O_RDWR);
1407 ssize_t len = read(fd, buf, sizeof(buf) - 1);
1408 if (len < 0)
1409 goto out;
1410
1411 buf[len] = 0;
1412 ret = atoi(buf);
1413
1414 if (!mtu || ret <= mtu)
1415 goto out;
1416
1417 lseek(fd, 0, SEEK_SET);
1418 if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
1419 ret = -1;
1420
1421 out:
1422 close(fd);
1423 return ret;
1424 }
1425
1426 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1427 {
1428 struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1429 struct blob_attr *cur;
1430 bool set_df = true;
1431 const char *str;
1432
1433 system_del_ip_tunnel(name);
1434
1435 blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1436 blob_data(attr), blob_len(attr));
1437
1438 if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1439 return -EINVAL;
1440 str = blobmsg_data(cur);
1441
1442 if ((cur = tb[TUNNEL_ATTR_DF]))
1443 set_df = blobmsg_get_bool(cur);
1444
1445 unsigned int ttl = 0;
1446 if ((cur = tb[TUNNEL_ATTR_TTL])) {
1447 ttl = blobmsg_get_u32(cur);
1448 if (ttl > 255 || (!set_df && ttl))
1449 return -EINVAL;
1450 }
1451
1452 unsigned int link = 0;
1453 if ((cur = tb[TUNNEL_ATTR_LINK])) {
1454 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
1455 if (!iface)
1456 return -EINVAL;
1457
1458 if (iface->l3_dev.dev)
1459 link = iface->l3_dev.dev->ifindex;
1460 }
1461
1462 if (!strcmp(str, "sit")) {
1463 struct ip_tunnel_parm p = {
1464 .link = link,
1465 .iph = {
1466 .version = 4,
1467 .ihl = 5,
1468 .frag_off = set_df ? htons(IP_DF) : 0,
1469 .protocol = IPPROTO_IPV6,
1470 .ttl = ttl
1471 }
1472 };
1473
1474 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1475 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
1476 return -EINVAL;
1477
1478 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1479 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
1480 return -EINVAL;
1481
1482 strncpy(p.name, name, sizeof(p.name));
1483 if (tunnel_ioctl("sit0", SIOCADDTUNNEL, &p) < 0)
1484 return -1;
1485
1486 #ifdef SIOCADD6RD
1487 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
1488 unsigned int mask;
1489 struct ip_tunnel_6rd p6;
1490
1491 memset(&p6, 0, sizeof(p6));
1492
1493 if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1494 &p6.prefix, &mask) || mask > 128)
1495 return -EINVAL;
1496 p6.prefixlen = mask;
1497
1498 if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1499 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1500 &p6.relay_prefix, &mask) || mask > 32)
1501 return -EINVAL;
1502 p6.relay_prefixlen = mask;
1503 }
1504
1505 if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1506 system_del_ip_tunnel(name);
1507 return -1;
1508 }
1509 }
1510 #endif
1511 } else if (!strcmp(str, "ipip6")) {
1512 struct ip6_tnl_parm p = {
1513 .link = link,
1514 .proto = IPPROTO_IPIP,
1515 .hop_limit = (ttl) ? ttl : 64,
1516 .encap_limit = 4,
1517 };
1518
1519 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1520 inet_pton(AF_INET6, blobmsg_data(cur), &p.laddr) < 1)
1521 return -EINVAL;
1522
1523 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1524 inet_pton(AF_INET6, blobmsg_data(cur), &p.raddr) < 1)
1525 return -EINVAL;
1526
1527 strncpy(p.name, name, sizeof(p.name));
1528 if (tunnel_ioctl("ip6tnl0", SIOCADDTUNNEL, &p) < 0)
1529 return -1;
1530 } else
1531 return -EINVAL;
1532
1533 return 0;
1534 }
OpenWrt Network interface configuration daemon