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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 };
62
63 static int sock_ioctl = -1;
64 static struct nl_sock *sock_rtnl = NULL;
65
66 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
67 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
68
69 static char dev_buf[256];
70
71 static void
72 handler_nl_event(struct uloop_fd *u, unsigned int events)
73 {
74 struct event_socket *ev = container_of(u, struct event_socket, uloop);
75 nl_recvmsgs_default(ev->sock);
76 }
77
78 static struct nl_sock *
79 create_socket(int protocol, int groups)
80 {
81 struct nl_sock *sock;
82
83 sock = nl_socket_alloc();
84 if (!sock)
85 return NULL;
86
87 if (groups)
88 nl_join_groups(sock, groups);
89
90 if (nl_connect(sock, protocol))
91 return NULL;
92
93 return sock;
94 }
95
96 static bool
97 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
98 uloop_fd_handler cb)
99 {
100 ev->sock = create_socket(protocol, groups);
101 if (!ev->sock)
102 return false;
103
104 ev->uloop.fd = nl_socket_get_fd(ev->sock);
105 ev->uloop.cb = cb;
106 if (uloop_fd_add(&ev->uloop, ULOOP_READ))
107 return false;
108
109 return true;
110 }
111
112 static bool
113 create_event_socket(struct event_socket *ev, int protocol,
114 int (*cb)(struct nl_msg *msg, void *arg))
115 {
116 if (!create_raw_event_socket(ev, protocol, 0, handler_nl_event))
117 return false;
118
119 // Install the valid custom callback handler
120 nl_socket_modify_cb(ev->sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
121
122 // Disable sequence number checking on event sockets
123 nl_socket_disable_seq_check(ev->sock);
124
125 // Increase rx buffer size to 65K on event sockets
126 if (nl_socket_set_buffer_size(ev->sock, 65535, 0))
127 return false;
128
129 return true;
130 }
131
132 int system_init(void)
133 {
134 static struct event_socket rtnl_event;
135 static struct event_socket hotplug_event;
136
137 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
138 system_fd_set_cloexec(sock_ioctl);
139
140 // Prepare socket for routing / address control
141 sock_rtnl = create_socket(NETLINK_ROUTE, 0);
142 if (!sock_rtnl)
143 return -1;
144
145 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
146 return -1;
147
148 if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
149 handle_hotplug_event))
150 return -1;
151
152 // Receive network link events form kernel
153 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
154
155 return 0;
156 }
157
158 static void system_set_sysctl(const char *path, const char *val)
159 {
160 int fd;
161
162 fd = open(path, O_WRONLY);
163 if (fd < 0)
164 return;
165
166 write(fd, val, strlen(val));
167 close(fd);
168 }
169
170 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
171 {
172 snprintf(dev_buf, sizeof(dev_buf), path, device);
173 system_set_sysctl(dev_buf, val);
174 }
175
176 static void system_set_disable_ipv6(struct device *dev, const char *val)
177 {
178 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
179 }
180
181 #ifndef IFF_LOWER_UP
182 #define IFF_LOWER_UP 0x10000
183 #endif
184
185 // Evaluate netlink messages
186 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
187 {
188 struct nlmsghdr *nh = nlmsg_hdr(msg);
189 struct ifinfomsg *ifi = NLMSG_DATA(nh);
190 struct nlattr *nla[__IFLA_MAX];
191
192 if (nh->nlmsg_type != RTM_NEWLINK)
193 goto out;
194
195 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
196 if (!nla[IFLA_IFNAME])
197 goto out;
198
199 struct device *dev = device_get(nla_data(nla[IFLA_IFNAME]), false);
200 if (!dev)
201 goto out;
202
203 device_set_ifindex(dev, ifi->ifi_index);
204 device_set_link(dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
205
206 out:
207 return 0;
208 }
209
210 static void
211 handle_hotplug_msg(char *data, int size)
212 {
213 const char *subsystem = NULL, *interface = NULL;
214 char *cur, *end, *sep;
215 struct device *dev;
216 int skip;
217 bool add;
218
219 if (!strncmp(data, "add@", 4))
220 add = true;
221 else if (!strncmp(data, "remove@", 7))
222 add = false;
223 else
224 return;
225
226 skip = strlen(data) + 1;
227 end = data + size;
228
229 for (cur = data + skip; cur < end; cur += skip) {
230 skip = strlen(cur) + 1;
231
232 sep = strchr(cur, '=');
233 if (!sep)
234 continue;
235
236 *sep = 0;
237 if (!strcmp(cur, "INTERFACE"))
238 interface = sep + 1;
239 else if (!strcmp(cur, "SUBSYSTEM")) {
240 subsystem = sep + 1;
241 if (strcmp(subsystem, "net") != 0)
242 return;
243 }
244 if (subsystem && interface)
245 goto found;
246 }
247 return;
248
249 found:
250 dev = device_get(interface, false);
251 if (!dev)
252 return;
253
254 if (dev->type != &simple_device_type)
255 return;
256
257 if (add && system_if_force_external(dev->ifname))
258 return;
259
260 device_set_present(dev, add);
261 }
262
263 static void
264 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
265 {
266 struct event_socket *ev = container_of(u, struct event_socket, uloop);
267 struct sockaddr_nl nla;
268 unsigned char *buf = NULL;
269 int size;
270
271 while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
272 if (nla.nl_pid == 0)
273 handle_hotplug_msg((char *) buf, size);
274
275 free(buf);
276 }
277 }
278
279 static int system_rtnl_call(struct nl_msg *msg)
280 {
281 int ret;
282
283 ret = nl_send_auto_complete(sock_rtnl, msg);
284 nlmsg_free(msg);
285
286 if (ret < 0)
287 return ret;
288
289 return nl_wait_for_ack(sock_rtnl);
290 }
291
292 int system_bridge_delbr(struct device *bridge)
293 {
294 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
295 }
296
297 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
298 {
299 struct ifreq ifr;
300
301 memset(&ifr, 0, sizeof(ifr));
302 if (dev)
303 ifr.ifr_ifindex = dev->ifindex;
304 else
305 ifr.ifr_data = data;
306 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
307 return ioctl(sock_ioctl, cmd, &ifr);
308 }
309
310 static bool system_is_bridge(const char *name, char *buf, int buflen)
311 {
312 struct stat st;
313
314 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
315 if (stat(buf, &st) < 0)
316 return false;
317
318 return true;
319 }
320
321 static char *system_get_bridge(const char *name, char *buf, int buflen)
322 {
323 char *path;
324 ssize_t len;
325 glob_t gl;
326
327 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
328 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
329 return NULL;
330
331 if (gl.gl_pathc == 0)
332 return NULL;
333
334 len = readlink(gl.gl_pathv[0], buf, buflen);
335 if (len < 0)
336 return NULL;
337
338 buf[len] = 0;
339 path = strrchr(buf, '/');
340 if (!path)
341 return NULL;
342
343 return path + 1;
344 }
345
346 int system_bridge_addif(struct device *bridge, struct device *dev)
347 {
348 char *oldbr;
349
350 system_set_disable_ipv6(dev, "1");
351 oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
352 if (oldbr && !strcmp(oldbr, bridge->ifname))
353 return 0;
354
355 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
356 }
357
358 int system_bridge_delif(struct device *bridge, struct device *dev)
359 {
360 system_set_disable_ipv6(dev, "0");
361 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
362 }
363
364 static int system_if_resolve(struct device *dev)
365 {
366 struct ifreq ifr;
367 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
368 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
369 return ifr.ifr_ifindex;
370 else
371 return 0;
372 }
373
374 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
375 {
376 struct ifreq ifr;
377
378 memset(&ifr, 0, sizeof(ifr));
379 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
380 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
381 ifr.ifr_flags |= add;
382 ifr.ifr_flags &= ~rem;
383 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
384 }
385
386 struct clear_data {
387 struct nl_msg *msg;
388 struct device *dev;
389 int type;
390 int size;
391 int af;
392 };
393
394
395 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
396 {
397 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
398
399 return ifa->ifa_index == ifindex;
400 }
401
402 static bool check_route(struct nlmsghdr *hdr, int ifindex)
403 {
404 struct rtmsg *r = NLMSG_DATA(hdr);
405 struct nlattr *tb[__RTA_MAX];
406
407 if (r->rtm_protocol == RTPROT_KERNEL &&
408 r->rtm_family == AF_INET6)
409 return false;
410
411 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
412 if (!tb[RTA_OIF])
413 return false;
414
415 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
416 }
417
418 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
419 {
420 return true;
421 }
422
423 static int cb_clear_event(struct nl_msg *msg, void *arg)
424 {
425 struct clear_data *clr = arg;
426 struct nlmsghdr *hdr = nlmsg_hdr(msg);
427 bool (*cb)(struct nlmsghdr *, int ifindex);
428 int type;
429
430 switch(clr->type) {
431 case RTM_GETADDR:
432 type = RTM_DELADDR;
433 if (hdr->nlmsg_type != RTM_NEWADDR)
434 return NL_SKIP;
435
436 cb = check_ifaddr;
437 break;
438 case RTM_GETROUTE:
439 type = RTM_DELROUTE;
440 if (hdr->nlmsg_type != RTM_NEWROUTE)
441 return NL_SKIP;
442
443 cb = check_route;
444 break;
445 case RTM_GETRULE:
446 type = RTM_DELRULE;
447 if (hdr->nlmsg_type != RTM_NEWRULE)
448 return NL_SKIP;
449
450 cb = check_rule;
451 break;
452 default:
453 return NL_SKIP;
454 }
455
456 if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
457 return NL_SKIP;
458
459 if (type == RTM_DELRULE)
460 D(SYSTEM, "Remove a rule\n");
461 else
462 D(SYSTEM, "Remove %s from device %s\n",
463 type == RTM_DELADDR ? "an address" : "a route",
464 clr->dev->ifname);
465 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
466 hdr = nlmsg_hdr(clr->msg);
467 hdr->nlmsg_type = type;
468 hdr->nlmsg_flags = NLM_F_REQUEST;
469
470 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
471 nl_wait_for_ack(sock_rtnl);
472
473 return NL_SKIP;
474 }
475
476 static int
477 cb_finish_event(struct nl_msg *msg, void *arg)
478 {
479 int *pending = arg;
480 *pending = 0;
481 return NL_STOP;
482 }
483
484 static int
485 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
486 {
487 int *pending = arg;
488 *pending = err->error;
489 return NL_STOP;
490 }
491
492 static void
493 system_if_clear_entries(struct device *dev, int type, int af)
494 {
495 struct clear_data clr;
496 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
497 struct rtmsg rtm = {
498 .rtm_family = af,
499 .rtm_flags = RTM_F_CLONED,
500 };
501 int flags = NLM_F_DUMP;
502 int pending = 1;
503
504 clr.af = af;
505 clr.dev = dev;
506 clr.type = type;
507 switch (type) {
508 case RTM_GETADDR:
509 case RTM_GETRULE:
510 clr.size = sizeof(struct rtgenmsg);
511 break;
512 case RTM_GETROUTE:
513 clr.size = sizeof(struct rtmsg);
514 break;
515 default:
516 return;
517 }
518
519 if (!cb)
520 return;
521
522 clr.msg = nlmsg_alloc_simple(type, flags);
523 if (!clr.msg)
524 goto out;
525
526 nlmsg_append(clr.msg, &rtm, clr.size, 0);
527 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
528 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
529 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
530
531 nl_send_auto_complete(sock_rtnl, clr.msg);
532 while (pending > 0)
533 nl_recvmsgs(sock_rtnl, cb);
534
535 nlmsg_free(clr.msg);
536 out:
537 nl_cb_put(cb);
538 }
539
540 /*
541 * Clear bridge (membership) state and bring down device
542 */
543 void system_if_clear_state(struct device *dev)
544 {
545 static char buf[256];
546 char *bridge;
547
548 if (dev->external)
549 return;
550
551 device_set_ifindex(dev, system_if_resolve(dev));
552 if (!dev->ifindex)
553 return;
554
555 system_if_flags(dev->ifname, 0, IFF_UP);
556
557 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
558 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
559 system_bridge_delbr(dev);
560 return;
561 }
562
563 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
564 if (bridge) {
565 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
566 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
567 }
568
569 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
570 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
571 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
572 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
573 system_set_disable_ipv6(dev, "0");
574 }
575
576 static inline unsigned long
577 sec_to_jiffies(int val)
578 {
579 return (unsigned long) val * 100;
580 }
581
582 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
583 {
584 unsigned long args[4] = {};
585
586 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
587 return -1;
588
589 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
590 args[1] = !!cfg->stp;
591 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
592
593 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
594 args[1] = sec_to_jiffies(cfg->forward_delay);
595 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
596
597 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
598 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
599
600 args[0] = BRCTL_SET_BRIDGE_PRIORITY;
601 args[1] = cfg->priority;
602 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
603
604 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
605 args[0] = BRCTL_SET_AGEING_TIME;
606 args[1] = sec_to_jiffies(cfg->ageing_time);
607 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
608 }
609
610 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
611 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
612 args[1] = sec_to_jiffies(cfg->hello_time);
613 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
614 }
615
616 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
617 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
618 args[1] = sec_to_jiffies(cfg->max_age);
619 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
620 }
621
622 return 0;
623 }
624
625 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
626 {
627 struct nl_msg *msg;
628 struct nlattr *linkinfo, *data;
629 struct ifinfomsg iim = { .ifi_family = AF_INET };
630 int ifindex = system_if_resolve(dev);
631 int i, rv;
632 static const struct {
633 const char *name;
634 enum macvlan_mode val;
635 } modes[] = {
636 { "private", MACVLAN_MODE_PRIVATE },
637 { "vepa", MACVLAN_MODE_VEPA },
638 { "bridge", MACVLAN_MODE_BRIDGE },
639 { "passthru", MACVLAN_MODE_PASSTHRU },
640 };
641
642 if (ifindex == 0)
643 return -ENOENT;
644
645 msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
646
647 if (!msg)
648 return -1;
649
650 nlmsg_append(msg, &iim, sizeof(iim), 0);
651
652 if (cfg->flags & MACVLAN_OPT_MACADDR)
653 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
654 nla_put(msg, IFLA_IFNAME, IFNAMSIZ, macvlan->ifname);
655 nla_put_u32(msg, IFLA_LINK, ifindex);
656
657 if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
658 goto nla_put_failure;
659
660 nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan");
661
662 if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
663 goto nla_put_failure;
664
665 if (cfg->mode) {
666 for (i = 0; i < ARRAY_SIZE(modes); i++) {
667 if (strcmp(cfg->mode, modes[i].name) != 0)
668 continue;
669
670 nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
671 break;
672 }
673 }
674
675 nla_nest_end(msg, data);
676 nla_nest_end(msg, linkinfo);
677
678 rv = system_rtnl_call(msg);
679 if (rv)
680 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
681
682 return rv;
683
684 nla_put_failure:
685 nlmsg_free(msg);
686 return -ENOMEM;
687 }
688
689 int system_macvlan_del(struct device *macvlan)
690 {
691 struct nl_msg *msg;
692 struct ifinfomsg iim;
693
694 iim.ifi_family = AF_INET;
695 iim.ifi_index = 0;
696
697 msg = nlmsg_alloc_simple(RTM_DELLINK, 0);
698
699 if (!msg)
700 return -1;
701
702 nlmsg_append(msg, &iim, sizeof(iim), 0);
703
704 nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan");
705 nla_put(msg, IFLA_IFNAME, sizeof(macvlan->ifname), macvlan->ifname);
706
707 system_rtnl_call(msg);
708
709 return 0;
710 }
711
712 static int system_vlan(struct device *dev, int id)
713 {
714 struct vlan_ioctl_args ifr = {
715 .cmd = SET_VLAN_NAME_TYPE_CMD,
716 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
717 };
718
719 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
720
721 if (id < 0) {
722 ifr.cmd = DEL_VLAN_CMD;
723 ifr.u.VID = 0;
724 } else {
725 ifr.cmd = ADD_VLAN_CMD;
726 ifr.u.VID = id;
727 }
728 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
729 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
730 }
731
732 int system_vlan_add(struct device *dev, int id)
733 {
734 return system_vlan(dev, id);
735 }
736
737 int system_vlan_del(struct device *dev)
738 {
739 return system_vlan(dev, -1);
740 }
741
742 static void
743 system_if_get_settings(struct device *dev, struct device_settings *s)
744 {
745 struct ifreq ifr;
746
747 memset(&ifr, 0, sizeof(ifr));
748 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
749
750 if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
751 s->mtu = ifr.ifr_mtu;
752 s->flags |= DEV_OPT_MTU;
753 }
754
755 if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
756 s->txqueuelen = ifr.ifr_qlen;
757 s->flags |= DEV_OPT_TXQUEUELEN;
758 }
759
760 if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
761 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
762 s->flags |= DEV_OPT_MACADDR;
763 }
764 }
765
766 void
767 system_if_apply_settings(struct device *dev, struct device_settings *s)
768 {
769 struct ifreq ifr;
770
771 memset(&ifr, 0, sizeof(ifr));
772 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
773 if (s->flags & DEV_OPT_MTU) {
774 ifr.ifr_mtu = s->mtu;
775 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
776 s->flags &= ~DEV_OPT_MTU;
777 }
778 if (s->flags & DEV_OPT_TXQUEUELEN) {
779 ifr.ifr_qlen = s->txqueuelen;
780 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
781 s->flags &= ~DEV_OPT_TXQUEUELEN;
782 }
783 if ((s->flags & DEV_OPT_MACADDR) && !dev->external) {
784 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
785 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
786 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
787 s->flags &= ~DEV_OPT_MACADDR;
788 }
789 }
790
791 int system_if_up(struct device *dev)
792 {
793 system_if_get_settings(dev, &dev->orig_settings);
794 system_if_apply_settings(dev, &dev->settings);
795 device_set_ifindex(dev, system_if_resolve(dev));
796 return system_if_flags(dev->ifname, IFF_UP, 0);
797 }
798
799 int system_if_down(struct device *dev)
800 {
801 int ret = system_if_flags(dev->ifname, 0, IFF_UP);
802 dev->orig_settings.flags &= dev->settings.flags;
803 system_if_apply_settings(dev, &dev->orig_settings);
804 return ret;
805 }
806
807 struct if_check_data {
808 struct device *dev;
809 int pending;
810 int ret;
811 };
812
813 static int cb_if_check_valid(struct nl_msg *msg, void *arg)
814 {
815 struct nlmsghdr *nh = nlmsg_hdr(msg);
816 struct ifinfomsg *ifi = NLMSG_DATA(nh);
817 struct if_check_data *chk = (struct if_check_data *)arg;
818
819 if (nh->nlmsg_type != RTM_NEWLINK)
820 return NL_SKIP;
821
822 device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false);
823 device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
824
825 return NL_OK;
826 }
827
828 static int cb_if_check_ack(struct nl_msg *msg, void *arg)
829 {
830 struct if_check_data *chk = (struct if_check_data *)arg;
831 chk->pending = 0;
832 return NL_STOP;
833 }
834
835 static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
836 {
837 struct if_check_data *chk = (struct if_check_data *)arg;
838
839 device_set_present(chk->dev, false);
840 device_set_link(chk->dev, false);
841 chk->pending = err->error;
842
843 return NL_STOP;
844 }
845
846 int system_if_check(struct device *dev)
847 {
848 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
849 struct nl_msg *msg;
850 struct ifinfomsg ifi = {
851 .ifi_family = AF_UNSPEC,
852 .ifi_index = 0,
853 };
854 struct if_check_data chk = {
855 .dev = dev,
856 .pending = 1,
857 };
858 int ret = 1;
859
860 msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
861 if (!msg || nlmsg_append(msg, &ifi, sizeof(ifi), 0) ||
862 nla_put_string(msg, IFLA_IFNAME, dev->ifname))
863 goto out;
864
865 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk);
866 nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk);
867 nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk);
868
869 nl_send_auto_complete(sock_rtnl, msg);
870 while (chk.pending > 0)
871 nl_recvmsgs(sock_rtnl, cb);
872
873 nlmsg_free(msg);
874 ret = chk.pending;
875
876 out:
877 nl_cb_put(cb);
878 return ret;
879 }
880
881 struct device *
882 system_if_get_parent(struct device *dev)
883 {
884 char buf[64], *devname;
885 int ifindex, iflink, len;
886 FILE *f;
887
888 snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
889 f = fopen(buf, "r");
890 if (!f)
891 return NULL;
892
893 len = fread(buf, 1, sizeof(buf) - 1, f);
894 fclose(f);
895
896 if (len <= 0)
897 return NULL;
898
899 buf[len] = 0;
900 iflink = strtoul(buf, NULL, 0);
901 ifindex = system_if_resolve(dev);
902 if (!iflink || iflink == ifindex)
903 return NULL;
904
905 devname = if_indextoname(iflink, buf);
906 if (!devname)
907 return NULL;
908
909 return device_get(devname, true);
910 }
911
912 static bool
913 read_string_file(int dir_fd, const char *file, char *buf, int len)
914 {
915 bool ret = false;
916 char *c;
917 int fd;
918
919 fd = openat(dir_fd, file, O_RDONLY);
920 if (fd < 0)
921 return false;
922
923 retry:
924 len = read(fd, buf, len - 1);
925 if (len < 0) {
926 if (errno == EINTR)
927 goto retry;
928 } else if (len > 0) {
929 buf[len] = 0;
930
931 c = strchr(buf, '\n');
932 if (c)
933 *c = 0;
934
935 ret = true;
936 }
937
938 close(fd);
939
940 return ret;
941 }
942
943 static bool
944 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
945 {
946 char buf[64];
947 bool ret = false;
948
949 ret = read_string_file(dir_fd, file, buf, sizeof(buf));
950 if (ret)
951 *val = strtoull(buf, NULL, 0);
952
953 return ret;
954 }
955
956 /* Assume advertised flags == supported flags */
957 static const struct {
958 uint32_t mask;
959 const char *name;
960 } ethtool_link_modes[] = {
961 { ADVERTISED_10baseT_Half, "10H" },
962 { ADVERTISED_10baseT_Full, "10F" },
963 { ADVERTISED_100baseT_Half, "100H" },
964 { ADVERTISED_100baseT_Full, "100F" },
965 { ADVERTISED_1000baseT_Half, "1000H" },
966 { ADVERTISED_1000baseT_Full, "1000F" },
967 };
968
969 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
970 {
971 int i;
972 for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
973 if (mask & ethtool_link_modes[i].mask)
974 blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
975 }
976 }
977
978 bool
979 system_if_force_external(const char *ifname)
980 {
981 char buf[64];
982 struct stat s;
983
984 snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
985 return stat(buf, &s) == 0;
986 }
987
988 int
989 system_if_dump_info(struct device *dev, struct blob_buf *b)
990 {
991 struct ethtool_cmd ecmd;
992 struct ifreq ifr;
993 char buf[64], *s;
994 void *c;
995 int dir_fd;
996
997 snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
998 dir_fd = open(buf, O_DIRECTORY);
999
1000 memset(&ecmd, 0, sizeof(ecmd));
1001 memset(&ifr, 0, sizeof(ifr));
1002 strcpy(ifr.ifr_name, dev->ifname);
1003 ifr.ifr_data = (caddr_t) &ecmd;
1004 ecmd.cmd = ETHTOOL_GSET;
1005
1006 if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
1007 c = blobmsg_open_array(b, "link-advertising");
1008 system_add_link_modes(b, ecmd.advertising);
1009 blobmsg_close_array(b, c);
1010
1011 c = blobmsg_open_array(b, "link-supported");
1012 system_add_link_modes(b, ecmd.supported);
1013 blobmsg_close_array(b, c);
1014
1015 s = blobmsg_alloc_string_buffer(b, "speed", 8);
1016 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
1017 ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
1018 blobmsg_add_string_buffer(b);
1019 }
1020
1021 close(dir_fd);
1022 return 0;
1023 }
1024
1025 int
1026 system_if_dump_stats(struct device *dev, struct blob_buf *b)
1027 {
1028 const char *const counters[] = {
1029 "collisions", "rx_frame_errors", "tx_compressed",
1030 "multicast", "rx_length_errors", "tx_dropped",
1031 "rx_bytes", "rx_missed_errors", "tx_errors",
1032 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
1033 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
1034 "rx_dropped", "tx_aborted_errors", "tx_packets",
1035 "rx_errors", "tx_bytes", "tx_window_errors",
1036 "rx_fifo_errors", "tx_carrier_errors",
1037 };
1038 char buf[64];
1039 int stats_dir;
1040 int i;
1041 uint64_t val = 0;
1042
1043 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
1044 stats_dir = open(buf, O_DIRECTORY);
1045 if (stats_dir < 0)
1046 return -1;
1047
1048 for (i = 0; i < ARRAY_SIZE(counters); i++)
1049 if (read_uint64_file(stats_dir, counters[i], &val))
1050 blobmsg_add_u64(b, counters[i], val);
1051
1052 close(stats_dir);
1053 return 0;
1054 }
1055
1056 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
1057 {
1058 bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
1059 int alen = v4 ? 4 : 16;
1060 unsigned int flags = 0;
1061 struct ifaddrmsg ifa = {
1062 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
1063 .ifa_prefixlen = addr->mask,
1064 .ifa_index = dev->ifindex,
1065 };
1066
1067 struct nl_msg *msg;
1068 if (cmd == RTM_NEWADDR)
1069 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1070
1071 msg = nlmsg_alloc_simple(cmd, flags);
1072 if (!msg)
1073 return -1;
1074
1075 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1076 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1077 if (v4) {
1078 if (addr->broadcast)
1079 nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1080 if (addr->point_to_point)
1081 nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1082 } else {
1083 time_t now = system_get_rtime();
1084 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1085
1086 if (addr->preferred_until) {
1087 int64_t preferred = addr->preferred_until - now;
1088 if (preferred < 0)
1089 preferred = 0;
1090 else if (preferred > UINT32_MAX)
1091 preferred = UINT32_MAX;
1092
1093 cinfo.ifa_prefered = preferred;
1094 }
1095
1096 if (addr->valid_until) {
1097 int64_t valid = addr->valid_until - now;
1098 if (valid <= 0)
1099 return -1;
1100 else if (valid > UINT32_MAX)
1101 valid = UINT32_MAX;
1102
1103 cinfo.ifa_valid = valid;
1104 }
1105
1106 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1107 }
1108
1109 return system_rtnl_call(msg);
1110 }
1111
1112 int system_add_address(struct device *dev, struct device_addr *addr)
1113 {
1114 return system_addr(dev, addr, RTM_NEWADDR);
1115 }
1116
1117 int system_del_address(struct device *dev, struct device_addr *addr)
1118 {
1119 return system_addr(dev, addr, RTM_DELADDR);
1120 }
1121
1122 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1123 {
1124 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1125 bool have_gw;
1126 unsigned int flags = 0;
1127
1128 if (alen == 4)
1129 have_gw = !!route->nexthop.in.s_addr;
1130 else
1131 have_gw = route->nexthop.in6.s6_addr32[0] ||
1132 route->nexthop.in6.s6_addr32[1] ||
1133 route->nexthop.in6.s6_addr32[2] ||
1134 route->nexthop.in6.s6_addr32[3];
1135
1136 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
1137 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1138
1139 unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1140 ? route->table : RT_TABLE_MAIN;
1141
1142 struct rtmsg rtm = {
1143 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1144 .rtm_dst_len = route->mask,
1145 .rtm_src_len = route->sourcemask,
1146 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1147 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
1148 .rtm_scope = scope,
1149 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1150 };
1151 struct nl_msg *msg;
1152
1153 if (cmd == RTM_NEWROUTE) {
1154 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1155
1156 if (!dev) { // Add null-route
1157 rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1158 rtm.rtm_type = RTN_UNREACHABLE;
1159 }
1160 }
1161
1162 msg = nlmsg_alloc_simple(cmd, flags);
1163 if (!msg)
1164 return -1;
1165
1166 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1167
1168 if (route->mask)
1169 nla_put(msg, RTA_DST, alen, &route->addr);
1170
1171 if (route->sourcemask)
1172 nla_put(msg, RTA_SRC, alen, &route->source);
1173
1174 if (route->metric > 0)
1175 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1176
1177 if (have_gw)
1178 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1179
1180 if (dev)
1181 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1182
1183 if (table >= 256)
1184 nla_put_u32(msg, RTA_TABLE, table);
1185
1186 return system_rtnl_call(msg);
1187 }
1188
1189 int system_add_route(struct device *dev, struct device_route *route)
1190 {
1191 return system_rt(dev, route, RTM_NEWROUTE);
1192 }
1193
1194 int system_del_route(struct device *dev, struct device_route *route)
1195 {
1196 return system_rt(dev, route, RTM_DELROUTE);
1197 }
1198
1199 int system_flush_routes(void)
1200 {
1201 const char *names[] = {
1202 "/proc/sys/net/ipv4/route/flush",
1203 "/proc/sys/net/ipv6/route/flush"
1204 };
1205 int fd, i;
1206
1207 for (i = 0; i < ARRAY_SIZE(names); i++) {
1208 fd = open(names[i], O_WRONLY);
1209 if (fd < 0)
1210 continue;
1211
1212 write(fd, "-1", 2);
1213 close(fd);
1214 }
1215 return 0;
1216 }
1217
1218 bool system_resolve_rt_table(const char *name, unsigned int *id)
1219 {
1220 FILE *f;
1221 char *e, buf[128];
1222 unsigned int n, table = RT_TABLE_UNSPEC;
1223
1224 /* first try to parse table as number */
1225 if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1226 table = n;
1227
1228 /* handle well known aliases */
1229 else if (!strcmp(name, "default"))
1230 table = RT_TABLE_DEFAULT;
1231 else if (!strcmp(name, "main"))
1232 table = RT_TABLE_MAIN;
1233 else if (!strcmp(name, "local"))
1234 table = RT_TABLE_LOCAL;
1235
1236 /* try to look up name in /etc/iproute2/rt_tables */
1237 else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1238 {
1239 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1240 {
1241 if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1242 continue;
1243
1244 n = strtoul(e, NULL, 10);
1245 e = strtok(NULL, " \t\n");
1246
1247 if (e && !strcmp(e, name))
1248 {
1249 table = n;
1250 break;
1251 }
1252 }
1253
1254 fclose(f);
1255 }
1256
1257 if (table == RT_TABLE_UNSPEC)
1258 return false;
1259
1260 /* do not consider main table special */
1261 if (table == RT_TABLE_MAIN)
1262 table = RT_TABLE_UNSPEC;
1263
1264 *id = table;
1265 return true;
1266 }
1267
1268 static int system_iprule(struct iprule *rule, int cmd)
1269 {
1270 int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1271
1272 struct nl_msg *msg;
1273 struct rtmsg rtm = {
1274 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1275 .rtm_protocol = RTPROT_STATIC,
1276 .rtm_scope = RT_SCOPE_UNIVERSE,
1277 .rtm_table = RT_TABLE_UNSPEC,
1278 .rtm_type = RTN_UNSPEC,
1279 .rtm_flags = 0,
1280 };
1281
1282 if (cmd == RTM_NEWRULE) {
1283 rtm.rtm_type = RTN_UNICAST;
1284 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1285 }
1286
1287 if (rule->invert)
1288 rtm.rtm_flags |= FIB_RULE_INVERT;
1289
1290 if (rule->flags & IPRULE_SRC)
1291 rtm.rtm_src_len = rule->src_mask;
1292
1293 if (rule->flags & IPRULE_DEST)
1294 rtm.rtm_dst_len = rule->dest_mask;
1295
1296 if (rule->flags & IPRULE_TOS)
1297 rtm.rtm_tos = rule->tos;
1298
1299 if (rule->flags & IPRULE_LOOKUP) {
1300 if (rule->lookup < 256)
1301 rtm.rtm_table = rule->lookup;
1302 }
1303
1304 if (rule->flags & IPRULE_ACTION)
1305 rtm.rtm_type = rule->action;
1306 else if (rule->flags & IPRULE_GOTO)
1307 rtm.rtm_type = FR_ACT_GOTO;
1308 else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1309 rtm.rtm_type = FR_ACT_NOP;
1310
1311 msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1312
1313 if (!msg)
1314 return -1;
1315
1316 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1317
1318 if (rule->flags & IPRULE_IN)
1319 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1320
1321 if (rule->flags & IPRULE_OUT)
1322 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1323
1324 if (rule->flags & IPRULE_SRC)
1325 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1326
1327 if (rule->flags & IPRULE_DEST)
1328 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1329
1330 if (rule->flags & IPRULE_PRIORITY)
1331 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1332 else if (cmd == RTM_NEWRULE)
1333 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1334
1335 if (rule->flags & IPRULE_FWMARK)
1336 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1337
1338 if (rule->flags & IPRULE_FWMASK)
1339 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1340
1341 if (rule->flags & IPRULE_LOOKUP) {
1342 if (rule->lookup >= 256)
1343 nla_put_u32(msg, FRA_TABLE, rule->lookup);
1344 }
1345
1346 if (rule->flags & IPRULE_GOTO)
1347 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1348
1349 return system_rtnl_call(msg);
1350 }
1351
1352 int system_add_iprule(struct iprule *rule)
1353 {
1354 return system_iprule(rule, RTM_NEWRULE);
1355 }
1356
1357 int system_del_iprule(struct iprule *rule)
1358 {
1359 return system_iprule(rule, RTM_DELRULE);
1360 }
1361
1362 int system_flush_iprules(void)
1363 {
1364 int rv = 0;
1365 struct iprule rule;
1366
1367 system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1368 system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1369
1370 memset(&rule, 0, sizeof(rule));
1371
1372
1373 rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1374
1375 rule.priority = 0;
1376 rule.lookup = RT_TABLE_LOCAL;
1377 rv |= system_iprule(&rule, RTM_NEWRULE);
1378
1379 rule.priority = 32766;
1380 rule.lookup = RT_TABLE_MAIN;
1381 rv |= system_iprule(&rule, RTM_NEWRULE);
1382
1383 rule.priority = 32767;
1384 rule.lookup = RT_TABLE_DEFAULT;
1385 rv |= system_iprule(&rule, RTM_NEWRULE);
1386
1387
1388 rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1389
1390 rule.priority = 0;
1391 rule.lookup = RT_TABLE_LOCAL;
1392 rv |= system_iprule(&rule, RTM_NEWRULE);
1393
1394 rule.priority = 32766;
1395 rule.lookup = RT_TABLE_MAIN;
1396 rv |= system_iprule(&rule, RTM_NEWRULE);
1397
1398 return rv;
1399 }
1400
1401 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1402 {
1403 char *e;
1404 unsigned int n;
1405
1406 if (!strcmp(action, "local"))
1407 n = RTN_LOCAL;
1408 else if (!strcmp(action, "nat"))
1409 n = RTN_NAT;
1410 else if (!strcmp(action, "broadcast"))
1411 n = RTN_BROADCAST;
1412 else if (!strcmp(action, "anycast"))
1413 n = RTN_ANYCAST;
1414 else if (!strcmp(action, "multicast"))
1415 n = RTN_MULTICAST;
1416 else if (!strcmp(action, "prohibit"))
1417 n = RTN_PROHIBIT;
1418 else if (!strcmp(action, "unreachable"))
1419 n = RTN_UNREACHABLE;
1420 else if (!strcmp(action, "blackhole"))
1421 n = RTN_BLACKHOLE;
1422 else if (!strcmp(action, "xresolve"))
1423 n = RTN_XRESOLVE;
1424 else if (!strcmp(action, "unicast"))
1425 n = RTN_UNICAST;
1426 else if (!strcmp(action, "throw"))
1427 n = RTN_THROW;
1428 else if (!strcmp(action, "failed_policy"))
1429 n = RTN_FAILED_POLICY;
1430 else {
1431 n = strtoul(action, &e, 0);
1432 if (!e || *e || e == action || n > 255)
1433 return false;
1434 }
1435
1436 *id = n;
1437 return true;
1438 }
1439
1440 time_t system_get_rtime(void)
1441 {
1442 struct timespec ts;
1443 struct timeval tv;
1444
1445 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1446 return ts.tv_sec;
1447
1448 if (gettimeofday(&tv, NULL) == 0)
1449 return tv.tv_sec;
1450
1451 return 0;
1452 }
1453
1454 #ifndef IP_DF
1455 #define IP_DF 0x4000
1456 #endif
1457
1458 static int tunnel_ioctl(const char *name, int cmd, void *p)
1459 {
1460 struct ifreq ifr;
1461
1462 memset(&ifr, 0, sizeof(ifr));
1463 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1464 ifr.ifr_ifru.ifru_data = p;
1465 return ioctl(sock_ioctl, cmd, &ifr);
1466 }
1467
1468 int system_del_ip_tunnel(const char *name)
1469 {
1470 return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
1471 }
1472
1473 int system_update_ipv6_mtu(struct device *dev, int mtu)
1474 {
1475 int ret = -1;
1476 char buf[64];
1477 snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
1478 dev->ifname);
1479
1480 int fd = open(buf, O_RDWR);
1481 ssize_t len = read(fd, buf, sizeof(buf) - 1);
1482 if (len < 0)
1483 goto out;
1484
1485 buf[len] = 0;
1486 ret = atoi(buf);
1487
1488 if (!mtu || ret <= mtu)
1489 goto out;
1490
1491 lseek(fd, 0, SEEK_SET);
1492 if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
1493 ret = -1;
1494
1495 out:
1496 close(fd);
1497 return ret;
1498 }
1499
1500 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1501 {
1502 struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1503 struct blob_attr *cur;
1504 bool set_df = true;
1505 const char *str;
1506
1507 system_del_ip_tunnel(name);
1508
1509 blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1510 blob_data(attr), blob_len(attr));
1511
1512 if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1513 return -EINVAL;
1514 str = blobmsg_data(cur);
1515
1516 if ((cur = tb[TUNNEL_ATTR_DF]))
1517 set_df = blobmsg_get_bool(cur);
1518
1519 unsigned int ttl = 0;
1520 if ((cur = tb[TUNNEL_ATTR_TTL])) {
1521 ttl = blobmsg_get_u32(cur);
1522 if (ttl > 255 || (!set_df && ttl))
1523 return -EINVAL;
1524 }
1525
1526 unsigned int link = 0;
1527 if ((cur = tb[TUNNEL_ATTR_LINK])) {
1528 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
1529 if (!iface)
1530 return -EINVAL;
1531
1532 if (iface->l3_dev.dev)
1533 link = iface->l3_dev.dev->ifindex;
1534 }
1535
1536 if (!strcmp(str, "sit")) {
1537 struct ip_tunnel_parm p = {
1538 .link = link,
1539 .iph = {
1540 .version = 4,
1541 .ihl = 5,
1542 .frag_off = set_df ? htons(IP_DF) : 0,
1543 .protocol = IPPROTO_IPV6,
1544 .ttl = ttl
1545 }
1546 };
1547
1548 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1549 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
1550 return -EINVAL;
1551
1552 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1553 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
1554 return -EINVAL;
1555
1556 strncpy(p.name, name, sizeof(p.name));
1557 if (tunnel_ioctl("sit0", SIOCADDTUNNEL, &p) < 0)
1558 return -1;
1559
1560 #ifdef SIOCADD6RD
1561 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
1562 unsigned int mask;
1563 struct ip_tunnel_6rd p6;
1564
1565 memset(&p6, 0, sizeof(p6));
1566
1567 if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1568 &p6.prefix, &mask) || mask > 128)
1569 return -EINVAL;
1570 p6.prefixlen = mask;
1571
1572 if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1573 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1574 &p6.relay_prefix, &mask) || mask > 32)
1575 return -EINVAL;
1576 p6.relay_prefixlen = mask;
1577 }
1578
1579 if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1580 system_del_ip_tunnel(name);
1581 return -1;
1582 }
1583 }
1584 #endif
1585 } else if (!strcmp(str, "ipip6")) {
1586 struct ip6_tnl_parm p = {
1587 .link = link,
1588 .proto = IPPROTO_IPIP,
1589 .hop_limit = (ttl) ? ttl : 64,
1590 .encap_limit = 4,
1591 };
1592
1593 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1594 inet_pton(AF_INET6, blobmsg_data(cur), &p.laddr) < 1)
1595 return -EINVAL;
1596
1597 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1598 inet_pton(AF_INET6, blobmsg_data(cur), &p.raddr) < 1)
1599 return -EINVAL;
1600
1601 strncpy(p.name, name, sizeof(p.name));
1602 if (tunnel_ioctl("ip6tnl0", SIOCADDTUNNEL, &p) < 0)
1603 return -1;
1604 } else
1605 return -EINVAL;
1606
1607 return 0;
1608 }
OpenWrt Network interface configuration daemon