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netifd v2: Fix source routing for IPv4
[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 * Copyright (C) 2014 Gioacchino Mazzurco <gio@eigenlab.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2
10 * as published by the Free Software Foundation
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17 #define _GNU_SOURCE
18
19 #include <sys/socket.h>
20 #include <sys/ioctl.h>
21 #include <sys/stat.h>
22 #include <sys/syscall.h>
23
24 #include <net/if.h>
25 #include <net/if_arp.h>
26
27 #include <arpa/inet.h>
28 #include <netinet/in.h>
29
30 #include <linux/rtnetlink.h>
31 #include <linux/sockios.h>
32 #include <linux/ip.h>
33 #include <linux/if_link.h>
34 #include <linux/if_vlan.h>
35 #include <linux/if_bridge.h>
36 #include <linux/if_tunnel.h>
37 #include <linux/ip6_tunnel.h>
38 #include <linux/ethtool.h>
39 #include <linux/fib_rules.h>
40 #include <linux/version.h>
41
42 #ifndef RTN_FAILED_POLICY
43 #define RTN_FAILED_POLICY 12
44 #endif
45
46 #include <string.h>
47 #include <fcntl.h>
48 #include <glob.h>
49 #include <time.h>
50
51 #include <netlink/msg.h>
52 #include <netlink/attr.h>
53 #include <netlink/socket.h>
54 #include <libubox/uloop.h>
55
56 #include "netifd.h"
57 #include "device.h"
58 #include "system.h"
59
60 struct event_socket {
61 struct uloop_fd uloop;
62 struct nl_sock *sock;
63 int bufsize;
64 };
65
66 static int sock_ioctl = -1;
67 static struct nl_sock *sock_rtnl = NULL;
68
69 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
70 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
71
72 static char dev_buf[256];
73
74 static void
75 handler_nl_event(struct uloop_fd *u, unsigned int events)
76 {
77 struct event_socket *ev = container_of(u, struct event_socket, uloop);
78 int err;
79 socklen_t errlen = sizeof(err);
80
81 if (!u->error) {
82 nl_recvmsgs_default(ev->sock);
83 return;
84 }
85
86 if (getsockopt(u->fd, SOL_SOCKET, SO_ERROR, (void *)&err, &errlen))
87 goto abort;
88
89 switch(err) {
90 case ENOBUFS:
91 // Increase rx buffer size on netlink socket
92 ev->bufsize *= 2;
93 if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
94 goto abort;
95
96 // Request full dump since some info got dropped
97 struct rtgenmsg msg = { .rtgen_family = AF_UNSPEC };
98 nl_send_simple(ev->sock, RTM_GETLINK, NLM_F_DUMP, &msg, sizeof(msg));
99 break;
100
101 default:
102 goto abort;
103 }
104 u->error = false;
105 return;
106
107 abort:
108 uloop_fd_delete(&ev->uloop);
109 return;
110 }
111
112 static struct nl_sock *
113 create_socket(int protocol, int groups)
114 {
115 struct nl_sock *sock;
116
117 sock = nl_socket_alloc();
118 if (!sock)
119 return NULL;
120
121 if (groups)
122 nl_join_groups(sock, groups);
123
124 if (nl_connect(sock, protocol))
125 return NULL;
126
127 return sock;
128 }
129
130 static bool
131 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
132 uloop_fd_handler cb, int flags)
133 {
134 ev->sock = create_socket(protocol, groups);
135 if (!ev->sock)
136 return false;
137
138 ev->uloop.fd = nl_socket_get_fd(ev->sock);
139 ev->uloop.cb = cb;
140 if (uloop_fd_add(&ev->uloop, ULOOP_READ|flags))
141 return false;
142
143 return true;
144 }
145
146 static bool
147 create_event_socket(struct event_socket *ev, int protocol,
148 int (*cb)(struct nl_msg *msg, void *arg))
149 {
150 if (!create_raw_event_socket(ev, protocol, 0, handler_nl_event, ULOOP_ERROR_CB))
151 return false;
152
153 // Install the valid custom callback handler
154 nl_socket_modify_cb(ev->sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
155
156 // Disable sequence number checking on event sockets
157 nl_socket_disable_seq_check(ev->sock);
158
159 // Increase rx buffer size to 65K on event sockets
160 ev->bufsize = 65535;
161 if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
162 return false;
163
164 return true;
165 }
166
167 static bool
168 system_rtn_aton(const char *src, unsigned int *dst)
169 {
170 char *e;
171 unsigned int n;
172
173 if (!strcmp(src, "local"))
174 n = RTN_LOCAL;
175 else if (!strcmp(src, "nat"))
176 n = RTN_NAT;
177 else if (!strcmp(src, "broadcast"))
178 n = RTN_BROADCAST;
179 else if (!strcmp(src, "anycast"))
180 n = RTN_ANYCAST;
181 else if (!strcmp(src, "multicast"))
182 n = RTN_MULTICAST;
183 else if (!strcmp(src, "prohibit"))
184 n = RTN_PROHIBIT;
185 else if (!strcmp(src, "unreachable"))
186 n = RTN_UNREACHABLE;
187 else if (!strcmp(src, "blackhole"))
188 n = RTN_BLACKHOLE;
189 else if (!strcmp(src, "xresolve"))
190 n = RTN_XRESOLVE;
191 else if (!strcmp(src, "unicast"))
192 n = RTN_UNICAST;
193 else if (!strcmp(src, "throw"))
194 n = RTN_THROW;
195 else if (!strcmp(src, "failed_policy"))
196 n = RTN_FAILED_POLICY;
197 else {
198 n = strtoul(src, &e, 0);
199 if (!e || *e || e == src || n > 255)
200 return false;
201 }
202
203 *dst = n;
204 return true;
205 }
206
207 static bool
208 system_tos_aton(const char *src, unsigned *dst)
209 {
210 char *e;
211
212 *dst = strtoul(src, &e, 16);
213 if (e == src || *e || *dst > 255)
214 return false;
215
216 return true;
217 }
218
219 int system_init(void)
220 {
221 static struct event_socket rtnl_event;
222 static struct event_socket hotplug_event;
223
224 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
225 system_fd_set_cloexec(sock_ioctl);
226
227 // Prepare socket for routing / address control
228 sock_rtnl = create_socket(NETLINK_ROUTE, 0);
229 if (!sock_rtnl)
230 return -1;
231
232 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
233 return -1;
234
235 if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
236 handle_hotplug_event, 0))
237 return -1;
238
239 // Receive network link events form kernel
240 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
241
242 return 0;
243 }
244
245 static void system_set_sysctl(const char *path, const char *val)
246 {
247 int fd;
248
249 fd = open(path, O_WRONLY);
250 if (fd < 0)
251 return;
252
253 if (write(fd, val, strlen(val))) {}
254 close(fd);
255 }
256
257 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
258 {
259 snprintf(dev_buf, sizeof(dev_buf), path, device);
260 system_set_sysctl(dev_buf, val);
261 }
262
263 static void system_set_disable_ipv6(struct device *dev, const char *val)
264 {
265 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
266 }
267
268 static void system_set_rpfilter(struct device *dev, const char *val)
269 {
270 system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter", dev->ifname, val);
271 }
272
273 static void system_set_acceptlocal(struct device *dev, const char *val)
274 {
275 system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local", dev->ifname, val);
276 }
277
278 static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
279 {
280 int fd = -1, ret = -1;
281
282 fd = open(path, O_RDONLY);
283 if (fd < 0)
284 goto out;
285
286 ssize_t len = read(fd, buf, buf_sz - 1);
287 if (len < 0)
288 goto out;
289
290 ret = buf[len] = 0;
291
292 out:
293 if (fd >= 0)
294 close(fd);
295
296 return ret;
297 }
298
299 static int
300 system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
301 {
302 snprintf(dev_buf, sizeof(dev_buf), path, device);
303 return system_get_sysctl(dev_buf, buf, buf_sz);
304 }
305
306 static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
307 {
308 return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
309 dev->ifname, buf, buf_sz);
310 }
311
312 static int system_get_rpfilter(struct device *dev, char *buf, const size_t buf_sz)
313 {
314 return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter",
315 dev->ifname, buf, buf_sz);
316 }
317
318 static int system_get_acceptlocal(struct device *dev, char *buf, const size_t buf_sz)
319 {
320 return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local",
321 dev->ifname, buf, buf_sz);
322 }
323
324 // Evaluate netlink messages
325 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
326 {
327 struct nlmsghdr *nh = nlmsg_hdr(msg);
328 struct ifinfomsg *ifi = NLMSG_DATA(nh);
329 struct nlattr *nla[__IFLA_MAX];
330 int link_state = 0;
331 char buf[10];
332
333 if (nh->nlmsg_type != RTM_NEWLINK)
334 goto out;
335
336 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
337 if (!nla[IFLA_IFNAME])
338 goto out;
339
340 struct device *dev = device_get(nla_data(nla[IFLA_IFNAME]), false);
341 if (!dev || dev->type->keep_link_status)
342 goto out;
343
344 if (!system_get_dev_sysctl("/sys/class/net/%s/carrier", dev->ifname, buf, sizeof(buf)))
345 link_state = strtoul(buf, NULL, 0);
346
347 device_set_link(dev, link_state ? true : false);
348
349 out:
350 return 0;
351 }
352
353 static void
354 handle_hotplug_msg(char *data, int size)
355 {
356 const char *subsystem = NULL, *interface = NULL;
357 char *cur, *end, *sep;
358 struct device *dev;
359 int skip;
360 bool add;
361
362 if (!strncmp(data, "add@", 4))
363 add = true;
364 else if (!strncmp(data, "remove@", 7))
365 add = false;
366 else
367 return;
368
369 skip = strlen(data) + 1;
370 end = data + size;
371
372 for (cur = data + skip; cur < end; cur += skip) {
373 skip = strlen(cur) + 1;
374
375 sep = strchr(cur, '=');
376 if (!sep)
377 continue;
378
379 *sep = 0;
380 if (!strcmp(cur, "INTERFACE"))
381 interface = sep + 1;
382 else if (!strcmp(cur, "SUBSYSTEM")) {
383 subsystem = sep + 1;
384 if (strcmp(subsystem, "net") != 0)
385 return;
386 }
387 if (subsystem && interface)
388 goto found;
389 }
390 return;
391
392 found:
393 dev = device_get(interface, false);
394 if (!dev)
395 return;
396
397 if (dev->type != &simple_device_type)
398 return;
399
400 if (add && system_if_force_external(dev->ifname))
401 return;
402
403 device_set_present(dev, add);
404 }
405
406 static void
407 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
408 {
409 struct event_socket *ev = container_of(u, struct event_socket, uloop);
410 struct sockaddr_nl nla;
411 unsigned char *buf = NULL;
412 int size;
413
414 while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
415 if (nla.nl_pid == 0)
416 handle_hotplug_msg((char *) buf, size);
417
418 free(buf);
419 }
420 }
421
422 static int system_rtnl_call(struct nl_msg *msg)
423 {
424 int ret;
425
426 ret = nl_send_auto_complete(sock_rtnl, msg);
427 nlmsg_free(msg);
428
429 if (ret < 0)
430 return ret;
431
432 return nl_wait_for_ack(sock_rtnl);
433 }
434
435 int system_bridge_delbr(struct device *bridge)
436 {
437 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
438 }
439
440 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
441 {
442 struct ifreq ifr;
443
444 memset(&ifr, 0, sizeof(ifr));
445 if (dev)
446 ifr.ifr_ifindex = dev->ifindex;
447 else
448 ifr.ifr_data = data;
449 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
450 return ioctl(sock_ioctl, cmd, &ifr);
451 }
452
453 static bool system_is_bridge(const char *name, char *buf, int buflen)
454 {
455 struct stat st;
456
457 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
458 if (stat(buf, &st) < 0)
459 return false;
460
461 return true;
462 }
463
464 static char *system_get_bridge(const char *name, char *buf, int buflen)
465 {
466 char *path;
467 ssize_t len = -1;
468 glob_t gl;
469
470 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
471 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
472 return NULL;
473
474 if (gl.gl_pathc > 0)
475 len = readlink(gl.gl_pathv[0], buf, buflen);
476
477 globfree(&gl);
478
479 if (len < 0)
480 return NULL;
481
482 buf[len] = 0;
483 path = strrchr(buf, '/');
484 if (!path)
485 return NULL;
486
487 return path + 1;
488 }
489
490 static void system_bridge_set_wireless(const char *bridge, const char *dev)
491 {
492 snprintf(dev_buf, sizeof(dev_buf),
493 "/sys/devices/virtual/net/%s/brif/%s/multicast_to_unicast",
494 bridge, dev);
495 system_set_sysctl(dev_buf, "1");
496 }
497
498 int system_bridge_addif(struct device *bridge, struct device *dev)
499 {
500 char *oldbr;
501 int ret = 0;
502
503 oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
504 if (!oldbr || strcmp(oldbr, bridge->ifname) != 0)
505 ret = system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
506
507 if (dev->wireless)
508 system_bridge_set_wireless(bridge->ifname, dev->ifname);
509
510 return ret;
511 }
512
513 int system_bridge_delif(struct device *bridge, struct device *dev)
514 {
515 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
516 }
517
518 int system_if_resolve(struct device *dev)
519 {
520 struct ifreq ifr;
521 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
522 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
523 return ifr.ifr_ifindex;
524 else
525 return 0;
526 }
527
528 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
529 {
530 struct ifreq ifr;
531
532 memset(&ifr, 0, sizeof(ifr));
533 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
534 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
535 ifr.ifr_flags |= add;
536 ifr.ifr_flags &= ~rem;
537 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
538 }
539
540 struct clear_data {
541 struct nl_msg *msg;
542 struct device *dev;
543 int type;
544 int size;
545 int af;
546 };
547
548
549 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
550 {
551 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
552
553 return ifa->ifa_index == ifindex;
554 }
555
556 static bool check_route(struct nlmsghdr *hdr, int ifindex)
557 {
558 struct rtmsg *r = NLMSG_DATA(hdr);
559 struct nlattr *tb[__RTA_MAX];
560
561 if (r->rtm_protocol == RTPROT_KERNEL &&
562 r->rtm_family == AF_INET6)
563 return false;
564
565 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
566 if (!tb[RTA_OIF])
567 return false;
568
569 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
570 }
571
572 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
573 {
574 return true;
575 }
576
577 static int cb_clear_event(struct nl_msg *msg, void *arg)
578 {
579 struct clear_data *clr = arg;
580 struct nlmsghdr *hdr = nlmsg_hdr(msg);
581 bool (*cb)(struct nlmsghdr *, int ifindex);
582 int type;
583
584 switch(clr->type) {
585 case RTM_GETADDR:
586 type = RTM_DELADDR;
587 if (hdr->nlmsg_type != RTM_NEWADDR)
588 return NL_SKIP;
589
590 cb = check_ifaddr;
591 break;
592 case RTM_GETROUTE:
593 type = RTM_DELROUTE;
594 if (hdr->nlmsg_type != RTM_NEWROUTE)
595 return NL_SKIP;
596
597 cb = check_route;
598 break;
599 case RTM_GETRULE:
600 type = RTM_DELRULE;
601 if (hdr->nlmsg_type != RTM_NEWRULE)
602 return NL_SKIP;
603
604 cb = check_rule;
605 break;
606 default:
607 return NL_SKIP;
608 }
609
610 if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
611 return NL_SKIP;
612
613 if (type == RTM_DELRULE)
614 D(SYSTEM, "Remove a rule\n");
615 else
616 D(SYSTEM, "Remove %s from device %s\n",
617 type == RTM_DELADDR ? "an address" : "a route",
618 clr->dev->ifname);
619 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
620 hdr = nlmsg_hdr(clr->msg);
621 hdr->nlmsg_type = type;
622 hdr->nlmsg_flags = NLM_F_REQUEST;
623
624 nl_socket_disable_auto_ack(sock_rtnl);
625 nl_send_auto_complete(sock_rtnl, clr->msg);
626 nl_socket_enable_auto_ack(sock_rtnl);
627
628 return NL_SKIP;
629 }
630
631 static int
632 cb_finish_event(struct nl_msg *msg, void *arg)
633 {
634 int *pending = arg;
635 *pending = 0;
636 return NL_STOP;
637 }
638
639 static int
640 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
641 {
642 int *pending = arg;
643 *pending = err->error;
644 return NL_STOP;
645 }
646
647 static void
648 system_if_clear_entries(struct device *dev, int type, int af)
649 {
650 struct clear_data clr;
651 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
652 struct rtmsg rtm = {
653 .rtm_family = af,
654 .rtm_flags = RTM_F_CLONED,
655 };
656 int flags = NLM_F_DUMP;
657 int pending = 1;
658
659 clr.af = af;
660 clr.dev = dev;
661 clr.type = type;
662 switch (type) {
663 case RTM_GETADDR:
664 case RTM_GETRULE:
665 clr.size = sizeof(struct rtgenmsg);
666 break;
667 case RTM_GETROUTE:
668 clr.size = sizeof(struct rtmsg);
669 break;
670 default:
671 return;
672 }
673
674 if (!cb)
675 return;
676
677 clr.msg = nlmsg_alloc_simple(type, flags);
678 if (!clr.msg)
679 goto out;
680
681 nlmsg_append(clr.msg, &rtm, clr.size, 0);
682 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
683 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
684 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
685
686 nl_send_auto_complete(sock_rtnl, clr.msg);
687 while (pending > 0)
688 nl_recvmsgs(sock_rtnl, cb);
689
690 nlmsg_free(clr.msg);
691 out:
692 nl_cb_put(cb);
693 }
694
695 /*
696 * Clear bridge (membership) state and bring down device
697 */
698 void system_if_clear_state(struct device *dev)
699 {
700 static char buf[256];
701 char *bridge;
702
703 device_set_ifindex(dev, system_if_resolve(dev));
704 if (dev->external || !dev->ifindex)
705 return;
706
707 system_if_flags(dev->ifname, 0, IFF_UP);
708
709 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
710 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
711 system_bridge_delbr(dev);
712 return;
713 }
714
715 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
716 if (bridge) {
717 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
718 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
719 }
720
721 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
722 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
723 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
724 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
725 system_set_disable_ipv6(dev, "0");
726 }
727
728 static inline unsigned long
729 sec_to_jiffies(int val)
730 {
731 return (unsigned long) val * 100;
732 }
733
734 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
735 {
736 unsigned long args[4] = {};
737
738 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
739 return -1;
740
741 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
742 args[1] = !!cfg->stp;
743 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
744
745 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
746 args[1] = sec_to_jiffies(cfg->forward_delay);
747 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
748
749 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
750 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
751
752 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier",
753 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
754
755 args[0] = BRCTL_SET_BRIDGE_PRIORITY;
756 args[1] = cfg->priority;
757 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
758
759 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
760 args[0] = BRCTL_SET_AGEING_TIME;
761 args[1] = sec_to_jiffies(cfg->ageing_time);
762 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
763 }
764
765 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
766 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
767 args[1] = sec_to_jiffies(cfg->hello_time);
768 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
769 }
770
771 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
772 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
773 args[1] = sec_to_jiffies(cfg->max_age);
774 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
775 }
776
777 return 0;
778 }
779
780 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
781 {
782 struct nl_msg *msg;
783 struct nlattr *linkinfo, *data;
784 struct ifinfomsg iim = { .ifi_family = AF_UNSPEC, };
785 int i, rv;
786 static const struct {
787 const char *name;
788 enum macvlan_mode val;
789 } modes[] = {
790 { "private", MACVLAN_MODE_PRIVATE },
791 { "vepa", MACVLAN_MODE_VEPA },
792 { "bridge", MACVLAN_MODE_BRIDGE },
793 { "passthru", MACVLAN_MODE_PASSTHRU },
794 };
795
796 msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
797
798 if (!msg)
799 return -1;
800
801 nlmsg_append(msg, &iim, sizeof(iim), 0);
802
803 if (cfg->flags & MACVLAN_OPT_MACADDR)
804 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
805 nla_put_string(msg, IFLA_IFNAME, macvlan->ifname);
806 nla_put_u32(msg, IFLA_LINK, dev->ifindex);
807
808 if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
809 goto nla_put_failure;
810
811 nla_put_string(msg, IFLA_INFO_KIND, "macvlan");
812
813 if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
814 goto nla_put_failure;
815
816 if (cfg->mode) {
817 for (i = 0; i < ARRAY_SIZE(modes); i++) {
818 if (strcmp(cfg->mode, modes[i].name) != 0)
819 continue;
820
821 nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
822 break;
823 }
824 }
825
826 nla_nest_end(msg, data);
827 nla_nest_end(msg, linkinfo);
828
829 rv = system_rtnl_call(msg);
830 if (rv)
831 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
832
833 return rv;
834
835 nla_put_failure:
836 nlmsg_free(msg);
837 return -ENOMEM;
838 }
839
840 static int system_link_del(const char *ifname)
841 {
842 struct nl_msg *msg;
843 struct ifinfomsg iim = {
844 .ifi_family = AF_UNSPEC,
845 .ifi_index = 0,
846 };
847
848 msg = nlmsg_alloc_simple(RTM_DELLINK, NLM_F_REQUEST);
849
850 if (!msg)
851 return -1;
852
853 nlmsg_append(msg, &iim, sizeof(iim), 0);
854 nla_put_string(msg, IFLA_IFNAME, ifname);
855 return system_rtnl_call(msg);
856 }
857
858 int system_macvlan_del(struct device *macvlan)
859 {
860 return system_link_del(macvlan->ifname);
861 }
862
863 static int system_vlan(struct device *dev, int id)
864 {
865 struct vlan_ioctl_args ifr = {
866 .cmd = SET_VLAN_NAME_TYPE_CMD,
867 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
868 };
869
870 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
871
872 if (id < 0) {
873 ifr.cmd = DEL_VLAN_CMD;
874 ifr.u.VID = 0;
875 } else {
876 ifr.cmd = ADD_VLAN_CMD;
877 ifr.u.VID = id;
878 }
879 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
880 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
881 }
882
883 int system_vlan_add(struct device *dev, int id)
884 {
885 return system_vlan(dev, id);
886 }
887
888 int system_vlan_del(struct device *dev)
889 {
890 return system_vlan(dev, -1);
891 }
892
893 int system_vlandev_add(struct device *vlandev, struct device *dev, struct vlandev_config *cfg)
894 {
895 struct nl_msg *msg;
896 struct nlattr *linkinfo, *data;
897 struct ifinfomsg iim = { .ifi_family = AF_UNSPEC };
898 int rv;
899
900 msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
901
902 if (!msg)
903 return -1;
904
905 nlmsg_append(msg, &iim, sizeof(iim), 0);
906 nla_put_string(msg, IFLA_IFNAME, vlandev->ifname);
907 nla_put_u32(msg, IFLA_LINK, dev->ifindex);
908
909 if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
910 goto nla_put_failure;
911
912 nla_put_string(msg, IFLA_INFO_KIND, "vlan");
913
914 if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
915 goto nla_put_failure;
916
917 nla_put_u16(msg, IFLA_VLAN_ID, cfg->vid);
918
919 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
920 nla_put_u16(msg, IFLA_VLAN_PROTOCOL, htons(cfg->proto));
921 #else
922 if(cfg->proto == VLAN_PROTO_8021AD)
923 netifd_log_message(L_WARNING, "%s Your kernel is older than linux 3.10.0, 802.1ad is not supported defaulting to 802.1q", vlandev->type->name);
924 #endif
925
926 nla_nest_end(msg, data);
927 nla_nest_end(msg, linkinfo);
928
929 rv = system_rtnl_call(msg);
930 if (rv)
931 D(SYSTEM, "Error adding vlandev '%s' over '%s': %d\n", vlandev->ifname, dev->ifname, rv);
932
933 return rv;
934
935 nla_put_failure:
936 nlmsg_free(msg);
937 return -ENOMEM;
938 }
939
940 int system_vlandev_del(struct device *vlandev)
941 {
942 return system_link_del(vlandev->ifname);
943 }
944
945 static void
946 system_if_get_settings(struct device *dev, struct device_settings *s)
947 {
948 struct ifreq ifr;
949 char buf[10];
950
951 memset(&ifr, 0, sizeof(ifr));
952 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
953
954 if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
955 s->mtu = ifr.ifr_mtu;
956 s->flags |= DEV_OPT_MTU;
957 }
958
959 if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
960 s->txqueuelen = ifr.ifr_qlen;
961 s->flags |= DEV_OPT_TXQUEUELEN;
962 }
963
964 if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
965 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
966 s->flags |= DEV_OPT_MACADDR;
967 }
968
969 if (!system_get_disable_ipv6(dev, buf, sizeof(buf))) {
970 s->ipv6 = !strtoul(buf, NULL, 0);
971 s->flags |= DEV_OPT_IPV6;
972 }
973
974 if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) == 0) {
975 s->promisc = ifr.ifr_flags & IFF_PROMISC;
976 s->flags |= DEV_OPT_PROMISC;
977 }
978
979 if (!system_get_rpfilter(dev, buf, sizeof(buf))) {
980 s->rpfilter = strtoul(buf, NULL, 0);
981 s->flags |= DEV_OPT_RPFILTER;
982 }
983
984 if (!system_get_acceptlocal(dev, buf, sizeof(buf))) {
985 s->acceptlocal = strtoul(buf, NULL, 0);
986 s->flags |= DEV_OPT_ACCEPTLOCAL;
987 }
988 }
989
990 void
991 system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
992 {
993 struct ifreq ifr;
994
995 if (!apply_mask)
996 return;
997
998 memset(&ifr, 0, sizeof(ifr));
999 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
1000 if (s->flags & DEV_OPT_MTU & apply_mask) {
1001 ifr.ifr_mtu = s->mtu;
1002 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
1003 s->flags &= ~DEV_OPT_MTU;
1004 }
1005 if (s->flags & DEV_OPT_TXQUEUELEN & apply_mask) {
1006 ifr.ifr_qlen = s->txqueuelen;
1007 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
1008 s->flags &= ~DEV_OPT_TXQUEUELEN;
1009 }
1010 if ((s->flags & DEV_OPT_MACADDR & apply_mask) && !dev->external) {
1011 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
1012 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
1013 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
1014 s->flags &= ~DEV_OPT_MACADDR;
1015 }
1016 if (s->flags & DEV_OPT_IPV6 & apply_mask)
1017 system_set_disable_ipv6(dev, s->ipv6 ? "0" : "1");
1018 if (s->flags & DEV_OPT_PROMISC & apply_mask) {
1019 if (system_if_flags(dev->ifname, s->promisc ? IFF_PROMISC : 0,
1020 !s->promisc ? IFF_PROMISC : 0) < 0)
1021 s->flags &= ~DEV_OPT_PROMISC;
1022 }
1023 if (s->flags & DEV_OPT_RPFILTER & apply_mask) {
1024 char buf[2];
1025
1026 snprintf(buf, sizeof(buf), "%d", s->rpfilter);
1027 system_set_rpfilter(dev, buf);
1028 }
1029 if (s->flags & DEV_OPT_ACCEPTLOCAL & apply_mask)
1030 system_set_acceptlocal(dev, s->acceptlocal ? "1" : "0");
1031 }
1032
1033 int system_if_up(struct device *dev)
1034 {
1035 system_if_get_settings(dev, &dev->orig_settings);
1036 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
1037 return system_if_flags(dev->ifname, IFF_UP, 0);
1038 }
1039
1040 int system_if_down(struct device *dev)
1041 {
1042 int ret = system_if_flags(dev->ifname, 0, IFF_UP);
1043 dev->orig_settings.flags &= dev->settings.flags;
1044 system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
1045 return ret;
1046 }
1047
1048 struct if_check_data {
1049 struct device *dev;
1050 int pending;
1051 int ret;
1052 };
1053
1054 #ifndef IFF_LOWER_UP
1055 #define IFF_LOWER_UP 0x10000
1056 #endif
1057
1058 static int cb_if_check_valid(struct nl_msg *msg, void *arg)
1059 {
1060 struct nlmsghdr *nh = nlmsg_hdr(msg);
1061 struct ifinfomsg *ifi = NLMSG_DATA(nh);
1062 struct if_check_data *chk = (struct if_check_data *)arg;
1063
1064 if (nh->nlmsg_type != RTM_NEWLINK)
1065 return NL_SKIP;
1066
1067 device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false);
1068 device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
1069
1070 return NL_OK;
1071 }
1072
1073 static int cb_if_check_ack(struct nl_msg *msg, void *arg)
1074 {
1075 struct if_check_data *chk = (struct if_check_data *)arg;
1076 chk->pending = 0;
1077 return NL_STOP;
1078 }
1079
1080 static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
1081 {
1082 struct if_check_data *chk = (struct if_check_data *)arg;
1083
1084 device_set_present(chk->dev, false);
1085 device_set_link(chk->dev, false);
1086 chk->pending = err->error;
1087
1088 return NL_STOP;
1089 }
1090
1091 int system_if_check(struct device *dev)
1092 {
1093 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
1094 struct nl_msg *msg;
1095 struct ifinfomsg ifi = {
1096 .ifi_family = AF_UNSPEC,
1097 .ifi_index = 0,
1098 };
1099 struct if_check_data chk = {
1100 .dev = dev,
1101 .pending = 1,
1102 };
1103 int ret = 1;
1104
1105 msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
1106 if (!msg || nlmsg_append(msg, &ifi, sizeof(ifi), 0) ||
1107 nla_put_string(msg, IFLA_IFNAME, dev->ifname))
1108 goto out;
1109
1110 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk);
1111 nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk);
1112 nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk);
1113
1114 nl_send_auto_complete(sock_rtnl, msg);
1115 while (chk.pending > 0)
1116 nl_recvmsgs(sock_rtnl, cb);
1117
1118 nlmsg_free(msg);
1119 ret = chk.pending;
1120
1121 out:
1122 nl_cb_put(cb);
1123 return ret;
1124 }
1125
1126 struct device *
1127 system_if_get_parent(struct device *dev)
1128 {
1129 char buf[64], *devname;
1130 int ifindex, iflink, len;
1131 FILE *f;
1132
1133 snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
1134 f = fopen(buf, "r");
1135 if (!f)
1136 return NULL;
1137
1138 len = fread(buf, 1, sizeof(buf) - 1, f);
1139 fclose(f);
1140
1141 if (len <= 0)
1142 return NULL;
1143
1144 buf[len] = 0;
1145 iflink = strtoul(buf, NULL, 0);
1146 ifindex = system_if_resolve(dev);
1147 if (!iflink || iflink == ifindex)
1148 return NULL;
1149
1150 devname = if_indextoname(iflink, buf);
1151 if (!devname)
1152 return NULL;
1153
1154 return device_get(devname, true);
1155 }
1156
1157 static bool
1158 read_string_file(int dir_fd, const char *file, char *buf, int len)
1159 {
1160 bool ret = false;
1161 char *c;
1162 int fd;
1163
1164 fd = openat(dir_fd, file, O_RDONLY);
1165 if (fd < 0)
1166 return false;
1167
1168 retry:
1169 len = read(fd, buf, len - 1);
1170 if (len < 0) {
1171 if (errno == EINTR)
1172 goto retry;
1173 } else if (len > 0) {
1174 buf[len] = 0;
1175
1176 c = strchr(buf, '\n');
1177 if (c)
1178 *c = 0;
1179
1180 ret = true;
1181 }
1182
1183 close(fd);
1184
1185 return ret;
1186 }
1187
1188 static bool
1189 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
1190 {
1191 char buf[64];
1192 bool ret = false;
1193
1194 ret = read_string_file(dir_fd, file, buf, sizeof(buf));
1195 if (ret)
1196 *val = strtoull(buf, NULL, 0);
1197
1198 return ret;
1199 }
1200
1201 /* Assume advertised flags == supported flags */
1202 static const struct {
1203 uint32_t mask;
1204 const char *name;
1205 } ethtool_link_modes[] = {
1206 { ADVERTISED_10baseT_Half, "10H" },
1207 { ADVERTISED_10baseT_Full, "10F" },
1208 { ADVERTISED_100baseT_Half, "100H" },
1209 { ADVERTISED_100baseT_Full, "100F" },
1210 { ADVERTISED_1000baseT_Half, "1000H" },
1211 { ADVERTISED_1000baseT_Full, "1000F" },
1212 };
1213
1214 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
1215 {
1216 int i;
1217 for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
1218 if (mask & ethtool_link_modes[i].mask)
1219 blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
1220 }
1221 }
1222
1223 bool
1224 system_if_force_external(const char *ifname)
1225 {
1226 char buf[64];
1227 struct stat s;
1228
1229 snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
1230 return stat(buf, &s) == 0;
1231 }
1232
1233 int
1234 system_if_dump_info(struct device *dev, struct blob_buf *b)
1235 {
1236 struct ethtool_cmd ecmd;
1237 struct ifreq ifr;
1238 char buf[64], *s;
1239 void *c;
1240 int dir_fd;
1241
1242 snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
1243 dir_fd = open(buf, O_DIRECTORY);
1244
1245 memset(&ecmd, 0, sizeof(ecmd));
1246 memset(&ifr, 0, sizeof(ifr));
1247 strcpy(ifr.ifr_name, dev->ifname);
1248 ifr.ifr_data = (caddr_t) &ecmd;
1249 ecmd.cmd = ETHTOOL_GSET;
1250
1251 if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
1252 c = blobmsg_open_array(b, "link-advertising");
1253 system_add_link_modes(b, ecmd.advertising);
1254 blobmsg_close_array(b, c);
1255
1256 c = blobmsg_open_array(b, "link-supported");
1257 system_add_link_modes(b, ecmd.supported);
1258 blobmsg_close_array(b, c);
1259
1260 s = blobmsg_alloc_string_buffer(b, "speed", 8);
1261 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
1262 ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
1263 blobmsg_add_string_buffer(b);
1264 }
1265
1266 close(dir_fd);
1267 return 0;
1268 }
1269
1270 int
1271 system_if_dump_stats(struct device *dev, struct blob_buf *b)
1272 {
1273 const char *const counters[] = {
1274 "collisions", "rx_frame_errors", "tx_compressed",
1275 "multicast", "rx_length_errors", "tx_dropped",
1276 "rx_bytes", "rx_missed_errors", "tx_errors",
1277 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
1278 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
1279 "rx_dropped", "tx_aborted_errors", "tx_packets",
1280 "rx_errors", "tx_bytes", "tx_window_errors",
1281 "rx_fifo_errors", "tx_carrier_errors",
1282 };
1283 char buf[64];
1284 int stats_dir;
1285 int i;
1286 uint64_t val = 0;
1287
1288 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
1289 stats_dir = open(buf, O_DIRECTORY);
1290 if (stats_dir < 0)
1291 return -1;
1292
1293 for (i = 0; i < ARRAY_SIZE(counters); i++)
1294 if (read_uint64_file(stats_dir, counters[i], &val))
1295 blobmsg_add_u64(b, counters[i], val);
1296
1297 close(stats_dir);
1298 return 0;
1299 }
1300
1301 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
1302 {
1303 bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
1304 int alen = v4 ? 4 : 16;
1305 unsigned int flags = 0;
1306 struct ifaddrmsg ifa = {
1307 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
1308 .ifa_prefixlen = addr->mask,
1309 .ifa_index = dev->ifindex,
1310 };
1311
1312 struct nl_msg *msg;
1313 if (cmd == RTM_NEWADDR)
1314 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1315
1316 msg = nlmsg_alloc_simple(cmd, flags);
1317 if (!msg)
1318 return -1;
1319
1320 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1321 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1322 if (v4) {
1323 if (addr->broadcast)
1324 nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1325 if (addr->point_to_point)
1326 nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1327 } else {
1328 time_t now = system_get_rtime();
1329 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1330
1331 if (addr->preferred_until) {
1332 int64_t preferred = addr->preferred_until - now;
1333 if (preferred < 0)
1334 preferred = 0;
1335 else if (preferred > UINT32_MAX)
1336 preferred = UINT32_MAX;
1337
1338 cinfo.ifa_prefered = preferred;
1339 }
1340
1341 if (addr->valid_until) {
1342 int64_t valid = addr->valid_until - now;
1343 if (valid <= 0)
1344 return -1;
1345 else if (valid > UINT32_MAX)
1346 valid = UINT32_MAX;
1347
1348 cinfo.ifa_valid = valid;
1349 }
1350
1351 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1352 }
1353
1354 return system_rtnl_call(msg);
1355 }
1356
1357 int system_add_address(struct device *dev, struct device_addr *addr)
1358 {
1359 return system_addr(dev, addr, RTM_NEWADDR);
1360 }
1361
1362 int system_del_address(struct device *dev, struct device_addr *addr)
1363 {
1364 return system_addr(dev, addr, RTM_DELADDR);
1365 }
1366
1367 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1368 {
1369 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1370 bool have_gw;
1371 unsigned int flags = 0;
1372
1373 if (alen == 4)
1374 have_gw = !!route->nexthop.in.s_addr;
1375 else
1376 have_gw = route->nexthop.in6.s6_addr32[0] ||
1377 route->nexthop.in6.s6_addr32[1] ||
1378 route->nexthop.in6.s6_addr32[2] ||
1379 route->nexthop.in6.s6_addr32[3];
1380
1381 unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1382 ? route->table : RT_TABLE_MAIN;
1383
1384 struct rtmsg rtm = {
1385 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1386 .rtm_dst_len = route->mask,
1387 .rtm_src_len = route->sourcemask,
1388 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1389 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
1390 .rtm_scope = RT_SCOPE_NOWHERE,
1391 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1392 .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
1393 };
1394 struct nl_msg *msg;
1395
1396 if (cmd == RTM_NEWROUTE) {
1397 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1398
1399 if (!dev) { // Add null-route
1400 rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1401 rtm.rtm_type = RTN_UNREACHABLE;
1402 }
1403 else
1404 rtm.rtm_scope = (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1405 }
1406
1407 if (route->flags & DEVROUTE_TYPE) {
1408 rtm.rtm_type = route->type;
1409 if (!(route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))) {
1410 if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_BROADCAST ||
1411 rtm.rtm_type == RTN_NAT || rtm.rtm_type == RTN_ANYCAST)
1412 rtm.rtm_table = RT_TABLE_LOCAL;
1413 }
1414
1415 if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_NAT) {
1416 rtm.rtm_scope = RT_SCOPE_HOST;
1417 } else if (rtm.rtm_type == RTN_BROADCAST || rtm.rtm_type == RTN_MULTICAST ||
1418 rtm.rtm_type == RTN_ANYCAST) {
1419 rtm.rtm_scope = RT_SCOPE_LINK;
1420 } else if (rtm.rtm_type == RTN_BLACKHOLE || rtm.rtm_type == RTN_UNREACHABLE ||
1421 rtm.rtm_type == RTN_PROHIBIT || rtm.rtm_type == RTN_FAILED_POLICY) {
1422 rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1423 dev = NULL;
1424 }
1425 }
1426
1427 msg = nlmsg_alloc_simple(cmd, flags);
1428 if (!msg)
1429 return -1;
1430
1431 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1432
1433 if (route->mask)
1434 nla_put(msg, RTA_DST, alen, &route->addr);
1435
1436 if (route->sourcemask) {
1437 if (rtm.rtm_family == AF_INET)
1438 nla_put(msg, RTA_PREFSRC, alen, &route->source);
1439 else
1440 nla_put(msg, RTA_SRC, alen, &route->source);
1441 }
1442
1443 if (route->metric > 0)
1444 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1445
1446 if (have_gw)
1447 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1448
1449 if (dev)
1450 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1451
1452 if (table >= 256)
1453 nla_put_u32(msg, RTA_TABLE, table);
1454
1455 if (route->flags & DEVROUTE_MTU) {
1456 struct nlattr *metrics;
1457
1458 if (!(metrics = nla_nest_start(msg, RTA_METRICS)))
1459 goto nla_put_failure;
1460
1461 nla_put_u32(msg, RTAX_MTU, route->mtu);
1462
1463 nla_nest_end(msg, metrics);
1464 }
1465
1466 return system_rtnl_call(msg);
1467
1468 nla_put_failure:
1469 nlmsg_free(msg);
1470 return -ENOMEM;
1471 }
1472
1473 int system_add_route(struct device *dev, struct device_route *route)
1474 {
1475 return system_rt(dev, route, RTM_NEWROUTE);
1476 }
1477
1478 int system_del_route(struct device *dev, struct device_route *route)
1479 {
1480 return system_rt(dev, route, RTM_DELROUTE);
1481 }
1482
1483 int system_flush_routes(void)
1484 {
1485 const char *names[] = {
1486 "/proc/sys/net/ipv4/route/flush",
1487 "/proc/sys/net/ipv6/route/flush"
1488 };
1489 int fd, i;
1490
1491 for (i = 0; i < ARRAY_SIZE(names); i++) {
1492 fd = open(names[i], O_WRONLY);
1493 if (fd < 0)
1494 continue;
1495
1496 if (write(fd, "-1", 2)) {}
1497 close(fd);
1498 }
1499 return 0;
1500 }
1501
1502 bool system_resolve_rt_type(const char *type, unsigned int *id)
1503 {
1504 return system_rtn_aton(type, id);
1505 }
1506
1507 bool system_resolve_rt_table(const char *name, unsigned int *id)
1508 {
1509 FILE *f;
1510 char *e, buf[128];
1511 unsigned int n, table = RT_TABLE_UNSPEC;
1512
1513 /* first try to parse table as number */
1514 if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1515 table = n;
1516
1517 /* handle well known aliases */
1518 else if (!strcmp(name, "default"))
1519 table = RT_TABLE_DEFAULT;
1520 else if (!strcmp(name, "main"))
1521 table = RT_TABLE_MAIN;
1522 else if (!strcmp(name, "local"))
1523 table = RT_TABLE_LOCAL;
1524
1525 /* try to look up name in /etc/iproute2/rt_tables */
1526 else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1527 {
1528 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1529 {
1530 if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1531 continue;
1532
1533 n = strtoul(e, NULL, 10);
1534 e = strtok(NULL, " \t\n");
1535
1536 if (e && !strcmp(e, name))
1537 {
1538 table = n;
1539 break;
1540 }
1541 }
1542
1543 fclose(f);
1544 }
1545
1546 if (table == RT_TABLE_UNSPEC)
1547 return false;
1548
1549 *id = table;
1550 return true;
1551 }
1552
1553 bool system_is_default_rt_table(unsigned int id)
1554 {
1555 return (id == RT_TABLE_MAIN);
1556 }
1557
1558 bool system_resolve_rpfilter(const char *filter, unsigned int *id)
1559 {
1560 char *e;
1561 unsigned int n;
1562
1563 if (!strcmp(filter, "strict"))
1564 n = 1;
1565 else if (!strcmp(filter, "loose"))
1566 n = 2;
1567 else {
1568 n = strtoul(filter, &e, 0);
1569 if (*e || e == filter || n > 2)
1570 return false;
1571 }
1572
1573 *id = n;
1574 return true;
1575 }
1576
1577 static int system_iprule(struct iprule *rule, int cmd)
1578 {
1579 int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1580
1581 struct nl_msg *msg;
1582 struct rtmsg rtm = {
1583 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1584 .rtm_protocol = RTPROT_STATIC,
1585 .rtm_scope = RT_SCOPE_UNIVERSE,
1586 .rtm_table = RT_TABLE_UNSPEC,
1587 .rtm_type = RTN_UNSPEC,
1588 .rtm_flags = 0,
1589 };
1590
1591 if (cmd == RTM_NEWRULE) {
1592 rtm.rtm_type = RTN_UNICAST;
1593 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1594 }
1595
1596 if (rule->invert)
1597 rtm.rtm_flags |= FIB_RULE_INVERT;
1598
1599 if (rule->flags & IPRULE_SRC)
1600 rtm.rtm_src_len = rule->src_mask;
1601
1602 if (rule->flags & IPRULE_DEST)
1603 rtm.rtm_dst_len = rule->dest_mask;
1604
1605 if (rule->flags & IPRULE_TOS)
1606 rtm.rtm_tos = rule->tos;
1607
1608 if (rule->flags & IPRULE_LOOKUP) {
1609 if (rule->lookup < 256)
1610 rtm.rtm_table = rule->lookup;
1611 }
1612
1613 if (rule->flags & IPRULE_ACTION)
1614 rtm.rtm_type = rule->action;
1615 else if (rule->flags & IPRULE_GOTO)
1616 rtm.rtm_type = FR_ACT_GOTO;
1617 else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1618 rtm.rtm_type = FR_ACT_NOP;
1619
1620 msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1621
1622 if (!msg)
1623 return -1;
1624
1625 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1626
1627 if (rule->flags & IPRULE_IN)
1628 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1629
1630 if (rule->flags & IPRULE_OUT)
1631 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1632
1633 if (rule->flags & IPRULE_SRC)
1634 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1635
1636 if (rule->flags & IPRULE_DEST)
1637 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1638
1639 if (rule->flags & IPRULE_PRIORITY)
1640 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1641 else if (cmd == RTM_NEWRULE)
1642 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1643
1644 if (rule->flags & IPRULE_FWMARK)
1645 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1646
1647 if (rule->flags & IPRULE_FWMASK)
1648 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1649
1650 if (rule->flags & IPRULE_LOOKUP) {
1651 if (rule->lookup >= 256)
1652 nla_put_u32(msg, FRA_TABLE, rule->lookup);
1653 }
1654
1655 if (rule->flags & IPRULE_GOTO)
1656 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1657
1658 return system_rtnl_call(msg);
1659 }
1660
1661 int system_add_iprule(struct iprule *rule)
1662 {
1663 return system_iprule(rule, RTM_NEWRULE);
1664 }
1665
1666 int system_del_iprule(struct iprule *rule)
1667 {
1668 return system_iprule(rule, RTM_DELRULE);
1669 }
1670
1671 int system_flush_iprules(void)
1672 {
1673 int rv = 0;
1674 struct iprule rule;
1675
1676 system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1677 system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1678
1679 memset(&rule, 0, sizeof(rule));
1680
1681
1682 rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1683
1684 rule.priority = 0;
1685 rule.lookup = RT_TABLE_LOCAL;
1686 rv |= system_iprule(&rule, RTM_NEWRULE);
1687
1688 rule.priority = 32766;
1689 rule.lookup = RT_TABLE_MAIN;
1690 rv |= system_iprule(&rule, RTM_NEWRULE);
1691
1692 rule.priority = 32767;
1693 rule.lookup = RT_TABLE_DEFAULT;
1694 rv |= system_iprule(&rule, RTM_NEWRULE);
1695
1696
1697 rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1698
1699 rule.priority = 0;
1700 rule.lookup = RT_TABLE_LOCAL;
1701 rv |= system_iprule(&rule, RTM_NEWRULE);
1702
1703 rule.priority = 32766;
1704 rule.lookup = RT_TABLE_MAIN;
1705 rv |= system_iprule(&rule, RTM_NEWRULE);
1706
1707 return rv;
1708 }
1709
1710 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1711 {
1712 return system_rtn_aton(action, id);
1713 }
1714
1715 time_t system_get_rtime(void)
1716 {
1717 struct timespec ts;
1718 struct timeval tv;
1719
1720 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1721 return ts.tv_sec;
1722
1723 if (gettimeofday(&tv, NULL) == 0)
1724 return tv.tv_sec;
1725
1726 return 0;
1727 }
1728
1729 #ifndef IP_DF
1730 #define IP_DF 0x4000
1731 #endif
1732
1733 static int tunnel_ioctl(const char *name, int cmd, void *p)
1734 {
1735 struct ifreq ifr;
1736
1737 memset(&ifr, 0, sizeof(ifr));
1738 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1739 ifr.ifr_ifru.ifru_data = p;
1740 return ioctl(sock_ioctl, cmd, &ifr);
1741 }
1742
1743 #ifdef IFLA_IPTUN_MAX
1744 #define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
1745 static int system_add_gre_tunnel(const char *name, const char *kind,
1746 const unsigned int link, struct blob_attr **tb, bool v6)
1747 {
1748 struct nl_msg *nlm;
1749 struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
1750 struct blob_attr *cur;
1751 uint32_t ikey = 0, okey = 0, flags = 0, flowinfo = 0;
1752 uint16_t iflags = 0, oflags = 0;
1753 uint8_t tos = 0;
1754 int ret = 0, ttl = 64;
1755
1756 nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
1757 if (!nlm)
1758 return -1;
1759
1760 nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
1761 nla_put_string(nlm, IFLA_IFNAME, name);
1762
1763 struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
1764 if (!linkinfo) {
1765 ret = -ENOMEM;
1766 goto failure;
1767 }
1768
1769 nla_put_string(nlm, IFLA_INFO_KIND, kind);
1770 struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
1771 if (!infodata) {
1772 ret = -ENOMEM;
1773 goto failure;
1774 }
1775
1776 if (link)
1777 nla_put_u32(nlm, IFLA_GRE_LINK, link);
1778
1779 if ((cur = tb[TUNNEL_ATTR_TTL]))
1780 ttl = blobmsg_get_u32(cur);
1781
1782 nla_put_u8(nlm, IFLA_GRE_TTL, ttl);
1783
1784 if ((cur = tb[TUNNEL_ATTR_TOS])) {
1785 char *str = blobmsg_get_string(cur);
1786 if (strcmp(str, "inherit")) {
1787 unsigned uval;
1788
1789 if (!system_tos_aton(str, &uval)) {
1790 ret = -EINVAL;
1791 goto failure;
1792 }
1793
1794 if (v6)
1795 flowinfo |= htonl(uval << 20) & IP6_FLOWINFO_TCLASS;
1796 else
1797 tos = uval;
1798 } else {
1799 if (v6)
1800 flags |= IP6_TNL_F_USE_ORIG_TCLASS;
1801 else
1802 tos = 1;
1803 }
1804 }
1805
1806 if ((cur = tb[TUNNEL_ATTR_INFO]) && (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)) {
1807 uint8_t icsum, ocsum, iseqno, oseqno;
1808 if (sscanf(blobmsg_get_string(cur), "%u,%u,%hhu,%hhu,%hhu,%hhu",
1809 &ikey, &okey, &icsum, &ocsum, &iseqno, &oseqno) < 6) {
1810 ret = -EINVAL;
1811 goto failure;
1812 }
1813
1814 if (ikey)
1815 iflags |= GRE_KEY;
1816
1817 if (okey)
1818 oflags |= GRE_KEY;
1819
1820 if (icsum)
1821 iflags |= GRE_CSUM;
1822
1823 if (ocsum)
1824 oflags |= GRE_CSUM;
1825
1826 if (iseqno)
1827 iflags |= GRE_SEQ;
1828
1829 if (oseqno)
1830 oflags |= GRE_SEQ;
1831 }
1832
1833 if (v6) {
1834 struct in6_addr in6buf;
1835 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1836 if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1837 ret = -EINVAL;
1838 goto failure;
1839 }
1840 nla_put(nlm, IFLA_GRE_LOCAL, sizeof(in6buf), &in6buf);
1841 }
1842
1843 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1844 if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1845 ret = -EINVAL;
1846 goto failure;
1847 }
1848 nla_put(nlm, IFLA_GRE_REMOTE, sizeof(in6buf), &in6buf);
1849 }
1850 nla_put_u8(nlm, IFLA_GRE_ENCAP_LIMIT, 4);
1851
1852 if (flowinfo)
1853 nla_put_u32(nlm, IFLA_GRE_FLOWINFO, flowinfo);
1854
1855 if (flags)
1856 nla_put_u32(nlm, IFLA_GRE_FLAGS, flags);
1857 } else {
1858 struct in_addr inbuf;
1859 bool set_df = true;
1860
1861 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1862 if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
1863 ret = -EINVAL;
1864 goto failure;
1865 }
1866 nla_put(nlm, IFLA_GRE_LOCAL, sizeof(inbuf), &inbuf);
1867 }
1868
1869 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1870 if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
1871 ret = -EINVAL;
1872 goto failure;
1873 }
1874 nla_put(nlm, IFLA_GRE_REMOTE, sizeof(inbuf), &inbuf);
1875
1876 if (IN_MULTICAST(ntohl(inbuf.s_addr))) {
1877 if (!okey) {
1878 okey = inbuf.s_addr;
1879 oflags |= GRE_KEY;
1880 }
1881
1882 if (!ikey) {
1883 ikey = inbuf.s_addr;
1884 iflags |= GRE_KEY;
1885 }
1886 }
1887 }
1888
1889 if ((cur = tb[TUNNEL_ATTR_DF]))
1890 set_df = blobmsg_get_bool(cur);
1891
1892 /* ttl !=0 and nopmtudisc are incompatible */
1893 if (ttl && !set_df) {
1894 ret = -EINVAL;
1895 goto failure;
1896 }
1897
1898 nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
1899
1900 nla_put_u8(nlm, IFLA_GRE_TOS, tos);
1901 }
1902
1903 if (oflags)
1904 nla_put_u16(nlm, IFLA_GRE_OFLAGS, oflags);
1905
1906 if (iflags)
1907 nla_put_u16(nlm, IFLA_GRE_IFLAGS, iflags);
1908
1909 if (okey)
1910 nla_put_u32(nlm, IFLA_GRE_OKEY, okey);
1911
1912 if (ikey)
1913 nla_put_u32(nlm, IFLA_GRE_IKEY, ikey);
1914
1915 nla_nest_end(nlm, infodata);
1916 nla_nest_end(nlm, linkinfo);
1917
1918 return system_rtnl_call(nlm);
1919
1920 failure:
1921 nlmsg_free(nlm);
1922 return ret;
1923 }
1924 #endif
1925
1926 static int system_add_proto_tunnel(const char *name, const uint8_t proto, const unsigned int link, struct blob_attr **tb)
1927 {
1928 struct blob_attr *cur;
1929 bool set_df = true;
1930 struct ip_tunnel_parm p = {
1931 .link = link,
1932 .iph = {
1933 .version = 4,
1934 .ihl = 5,
1935 .protocol = proto,
1936 }
1937 };
1938
1939 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1940 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
1941 return -EINVAL;
1942
1943 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1944 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
1945 return -EINVAL;
1946
1947 if ((cur = tb[TUNNEL_ATTR_DF]))
1948 set_df = blobmsg_get_bool(cur);
1949
1950 if ((cur = tb[TUNNEL_ATTR_TTL]))
1951 p.iph.ttl = blobmsg_get_u32(cur);
1952
1953 if ((cur = tb[TUNNEL_ATTR_TOS])) {
1954 char *str = blobmsg_get_string(cur);
1955 if (strcmp(str, "inherit")) {
1956 unsigned uval;
1957
1958 if (!system_tos_aton(str, &uval))
1959 return -EINVAL;
1960
1961 p.iph.tos = uval;
1962 } else
1963 p.iph.tos = 1;
1964 }
1965
1966 p.iph.frag_off = set_df ? htons(IP_DF) : 0;
1967 /* ttl !=0 and nopmtudisc are incompatible */
1968 if (p.iph.ttl && p.iph.frag_off == 0)
1969 return -EINVAL;
1970
1971 strncpy(p.name, name, sizeof(p.name));
1972
1973 switch (p.iph.protocol) {
1974 case IPPROTO_IPIP:
1975 return tunnel_ioctl("tunl0", SIOCADDTUNNEL, &p);
1976 case IPPROTO_IPV6:
1977 return tunnel_ioctl("sit0", SIOCADDTUNNEL, &p);
1978 default:
1979 break;
1980 }
1981 return -1;
1982 }
1983
1984 static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
1985 {
1986 struct blob_attr *cur;
1987 const char *str;
1988
1989 if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1990 return -EINVAL;
1991 str = blobmsg_data(cur);
1992
1993 if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
1994 !strcmp(str, "greip6") || !strcmp(str, "gretapip6"))
1995 return system_link_del(name);
1996 else
1997 return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
1998 }
1999
2000 int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
2001 {
2002 struct blob_attr *tb[__TUNNEL_ATTR_MAX];
2003
2004 blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
2005 blob_data(attr), blob_len(attr));
2006
2007 return __system_del_ip_tunnel(name, tb);
2008 }
2009
2010 int system_update_ipv6_mtu(struct device *dev, int mtu)
2011 {
2012 int ret = -1;
2013 char buf[64];
2014 snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
2015 dev->ifname);
2016
2017 int fd = open(buf, O_RDWR);
2018 ssize_t len = read(fd, buf, sizeof(buf) - 1);
2019 if (len < 0)
2020 goto out;
2021
2022 buf[len] = 0;
2023 ret = atoi(buf);
2024
2025 if (!mtu || ret <= mtu)
2026 goto out;
2027
2028 lseek(fd, 0, SEEK_SET);
2029 if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
2030 ret = -1;
2031
2032 out:
2033 close(fd);
2034 return ret;
2035 }
2036
2037 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
2038 {
2039 struct blob_attr *tb[__TUNNEL_ATTR_MAX];
2040 struct blob_attr *cur;
2041 const char *str;
2042
2043 blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
2044 blob_data(attr), blob_len(attr));
2045
2046 __system_del_ip_tunnel(name, tb);
2047
2048 if (!(cur = tb[TUNNEL_ATTR_TYPE]))
2049 return -EINVAL;
2050 str = blobmsg_data(cur);
2051
2052 unsigned int ttl = 0;
2053 if ((cur = tb[TUNNEL_ATTR_TTL])) {
2054 ttl = blobmsg_get_u32(cur);
2055 if (ttl > 255)
2056 return -EINVAL;
2057 }
2058
2059 unsigned int link = 0;
2060 if ((cur = tb[TUNNEL_ATTR_LINK])) {
2061 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
2062 if (!iface)
2063 return -EINVAL;
2064
2065 if (iface->l3_dev.dev)
2066 link = iface->l3_dev.dev->ifindex;
2067 }
2068
2069 if (!strcmp(str, "sit")) {
2070 if (system_add_proto_tunnel(name, IPPROTO_IPV6, link, tb) < 0)
2071 return -1;
2072
2073 #ifdef SIOCADD6RD
2074 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
2075 unsigned int mask;
2076 struct ip_tunnel_6rd p6;
2077
2078 memset(&p6, 0, sizeof(p6));
2079
2080 if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
2081 &p6.prefix, &mask) || mask > 128)
2082 return -EINVAL;
2083 p6.prefixlen = mask;
2084
2085 if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
2086 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
2087 &p6.relay_prefix, &mask) || mask > 32)
2088 return -EINVAL;
2089 p6.relay_prefixlen = mask;
2090 }
2091
2092 if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
2093 __system_del_ip_tunnel(name, tb);
2094 return -1;
2095 }
2096 }
2097 #endif
2098 #ifdef IFLA_IPTUN_MAX
2099 } else if (!strcmp(str, "ipip6")) {
2100 struct nl_msg *nlm = nlmsg_alloc_simple(RTM_NEWLINK,
2101 NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
2102 struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC };
2103 int ret = 0;
2104
2105 if (!nlm)
2106 return -1;
2107
2108 nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
2109 nla_put_string(nlm, IFLA_IFNAME, name);
2110
2111 if (link)
2112 nla_put_u32(nlm, IFLA_LINK, link);
2113
2114 struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
2115 if (!linkinfo) {
2116 ret = -ENOMEM;
2117 goto failure;
2118 }
2119 nla_put_string(nlm, IFLA_INFO_KIND, "ip6tnl");
2120 struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
2121 if (!infodata) {
2122 ret = -ENOMEM;
2123 goto failure;
2124 }
2125
2126 if (link)
2127 nla_put_u32(nlm, IFLA_IPTUN_LINK, link);
2128
2129 nla_put_u8(nlm, IFLA_IPTUN_PROTO, IPPROTO_IPIP);
2130 nla_put_u8(nlm, IFLA_IPTUN_TTL, (ttl) ? ttl : 64);
2131 nla_put_u8(nlm, IFLA_IPTUN_ENCAP_LIMIT, 4);
2132
2133 struct in6_addr in6buf;
2134 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2135 if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2136 ret = -EINVAL;
2137 goto failure;
2138 }
2139 nla_put(nlm, IFLA_IPTUN_LOCAL, sizeof(in6buf), &in6buf);
2140 }
2141
2142 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2143 if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2144 ret = -EINVAL;
2145 goto failure;
2146 }
2147 nla_put(nlm, IFLA_IPTUN_REMOTE, sizeof(in6buf), &in6buf);
2148 }
2149
2150 #ifdef IFLA_IPTUN_FMR_MAX
2151 if ((cur = tb[TUNNEL_ATTR_FMRS])) {
2152 struct nlattr *fmrs = nla_nest_start(nlm, IFLA_IPTUN_FMRS);
2153
2154 struct blob_attr *fmr;
2155 unsigned rem, fmrcnt = 0;
2156 blobmsg_for_each_attr(fmr, cur, rem) {
2157 if (blobmsg_type(fmr) != BLOBMSG_TYPE_STRING)
2158 continue;
2159
2160 unsigned ip4len, ip6len, ealen, offset = 6;
2161 char ip6buf[48];
2162 char ip4buf[16];
2163
2164 if (sscanf(blobmsg_get_string(fmr), "%47[^/]/%u,%15[^/]/%u,%u,%u",
2165 ip6buf, &ip6len, ip4buf, &ip4len, &ealen, &offset) < 5) {
2166 ret = -EINVAL;
2167 goto failure;
2168 }
2169
2170 struct in6_addr ip6prefix;
2171 struct in_addr ip4prefix;
2172 if (inet_pton(AF_INET6, ip6buf, &ip6prefix) != 1 ||
2173 inet_pton(AF_INET, ip4buf, &ip4prefix) != 1) {
2174 ret = -EINVAL;
2175 goto failure;
2176 }
2177
2178 struct nlattr *rule = nla_nest_start(nlm, ++fmrcnt);
2179
2180 nla_put(nlm, IFLA_IPTUN_FMR_IP6_PREFIX, sizeof(ip6prefix), &ip6prefix);
2181 nla_put(nlm, IFLA_IPTUN_FMR_IP4_PREFIX, sizeof(ip4prefix), &ip4prefix);
2182 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, ip6len);
2183 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, ip4len);
2184 nla_put_u8(nlm, IFLA_IPTUN_FMR_EA_LEN, ealen);
2185 nla_put_u8(nlm, IFLA_IPTUN_FMR_OFFSET, offset);
2186
2187 nla_nest_end(nlm, rule);
2188 }
2189
2190 nla_nest_end(nlm, fmrs);
2191 }
2192 #endif
2193
2194 nla_nest_end(nlm, infodata);
2195 nla_nest_end(nlm, linkinfo);
2196
2197 return system_rtnl_call(nlm);
2198 failure:
2199 nlmsg_free(nlm);
2200 return ret;
2201 } else if (!strcmp(str, "greip")) {
2202 return system_add_gre_tunnel(name, "gre", link, tb, false);
2203 } else if (!strcmp(str, "gretapip")) {
2204 return system_add_gre_tunnel(name, "gretap", link, tb, false);
2205 } else if (!strcmp(str, "greip6")) {
2206 return system_add_gre_tunnel(name, "ip6gre", link, tb, true);
2207 } else if (!strcmp(str, "gretapip6")) {
2208 return system_add_gre_tunnel(name, "ip6gretap", link, tb, true);
2209 #endif
2210 } else if (!strcmp(str, "ipip")) {
2211 return system_add_proto_tunnel(name, IPPROTO_IPIP, link, tb);
2212 }
2213 else
2214 return -EINVAL;
2215
2216 return 0;
2217 }
OpenWrt Network interface configuration daemon