9978ade5046da28dd78ec261bfda97d8a923288f
[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_addr.h>
34 #include <linux/if_link.h>
35 #include <linux/if_vlan.h>
36 #include <linux/if_bridge.h>
37 #include <linux/if_tunnel.h>
38 #include <linux/ip6_tunnel.h>
39 #include <linux/ethtool.h>
40 #include <linux/fib_rules.h>
41 #include <linux/version.h>
42
43 #ifndef RTN_FAILED_POLICY
44 #define RTN_FAILED_POLICY 12
45 #endif
46
47 #ifndef RT_TABLE_PRELOCAL
48 #define RT_TABLE_PRELOCAL 128
49 #endif
50
51 #ifndef IFA_F_NOPREFIXROUTE
52 #define IFA_F_NOPREFIXROUTE 0x200
53 #endif
54
55 #ifndef IFA_FLAGS
56 #define IFA_FLAGS (IFA_MULTICAST + 1)
57 #endif
58
59
60 #include <string.h>
61 #include <fcntl.h>
62 #include <glob.h>
63 #include <time.h>
64 #include <unistd.h>
65
66 #include <netlink/msg.h>
67 #include <netlink/attr.h>
68 #include <netlink/socket.h>
69 #include <libubox/uloop.h>
70
71 #include "netifd.h"
72 #include "device.h"
73 #include "system.h"
74
75 struct event_socket {
76         struct uloop_fd uloop;
77         struct nl_sock *sock;
78         int bufsize;
79 };
80
81 static int sock_ioctl = -1;
82 static struct nl_sock *sock_rtnl = NULL;
83
84 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
85 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
86
87 static char dev_buf[256];
88
89 static void
90 handler_nl_event(struct uloop_fd *u, unsigned int events)
91 {
92         struct event_socket *ev = container_of(u, struct event_socket, uloop);
93         int err;
94         socklen_t errlen = sizeof(err);
95
96         if (!u->error) {
97                 nl_recvmsgs_default(ev->sock);
98                 return;
99         }
100
101         if (getsockopt(u->fd, SOL_SOCKET, SO_ERROR, (void *)&err, &errlen))
102                 goto abort;
103
104         switch(err) {
105         case ENOBUFS:
106                 // Increase rx buffer size on netlink socket
107                 ev->bufsize *= 2;
108                 if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
109                         goto abort;
110
111                 // Request full dump since some info got dropped
112                 struct rtgenmsg msg = { .rtgen_family = AF_UNSPEC };
113                 nl_send_simple(ev->sock, RTM_GETLINK, NLM_F_DUMP, &msg, sizeof(msg));
114                 break;
115
116         default:
117                 goto abort;
118         }
119         u->error = false;
120         return;
121
122 abort:
123         uloop_fd_delete(&ev->uloop);
124         return;
125 }
126
127 static struct nl_sock *
128 create_socket(int protocol, int groups)
129 {
130         struct nl_sock *sock;
131
132         sock = nl_socket_alloc();
133         if (!sock)
134                 return NULL;
135
136         if (groups)
137                 nl_join_groups(sock, groups);
138
139         if (nl_connect(sock, protocol))
140                 return NULL;
141
142         return sock;
143 }
144
145 static bool
146 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
147                         uloop_fd_handler cb, int flags)
148 {
149         ev->sock = create_socket(protocol, groups);
150         if (!ev->sock)
151                 return false;
152
153         ev->uloop.fd = nl_socket_get_fd(ev->sock);
154         ev->uloop.cb = cb;
155         if (uloop_fd_add(&ev->uloop, ULOOP_READ|flags))
156                 return false;
157
158         return true;
159 }
160
161 static bool
162 create_event_socket(struct event_socket *ev, int protocol,
163                     int (*cb)(struct nl_msg *msg, void *arg))
164 {
165         if (!create_raw_event_socket(ev, protocol, 0, handler_nl_event, ULOOP_ERROR_CB))
166                 return false;
167
168         // Install the valid custom callback handler
169         nl_socket_modify_cb(ev->sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
170
171         // Disable sequence number checking on event sockets
172         nl_socket_disable_seq_check(ev->sock);
173
174         // Increase rx buffer size to 65K on event sockets
175         ev->bufsize = 65535;
176         if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
177                 return false;
178
179         return true;
180 }
181
182 static bool
183 system_rtn_aton(const char *src, unsigned int *dst)
184 {
185         char *e;
186         unsigned int n;
187
188         if (!strcmp(src, "local"))
189                 n = RTN_LOCAL;
190         else if (!strcmp(src, "nat"))
191                 n = RTN_NAT;
192         else if (!strcmp(src, "broadcast"))
193                 n = RTN_BROADCAST;
194         else if (!strcmp(src, "anycast"))
195                 n = RTN_ANYCAST;
196         else if (!strcmp(src, "multicast"))
197                 n = RTN_MULTICAST;
198         else if (!strcmp(src, "prohibit"))
199                 n = RTN_PROHIBIT;
200         else if (!strcmp(src, "unreachable"))
201                 n = RTN_UNREACHABLE;
202         else if (!strcmp(src, "blackhole"))
203                 n = RTN_BLACKHOLE;
204         else if (!strcmp(src, "xresolve"))
205                 n = RTN_XRESOLVE;
206         else if (!strcmp(src, "unicast"))
207                 n = RTN_UNICAST;
208         else if (!strcmp(src, "throw"))
209                 n = RTN_THROW;
210         else if (!strcmp(src, "failed_policy"))
211                 n = RTN_FAILED_POLICY;
212         else {
213                 n = strtoul(src, &e, 0);
214                 if (!e || *e || e == src || n > 255)
215                         return false;
216         }
217
218         *dst = n;
219         return true;
220 }
221
222 static bool
223 system_tos_aton(const char *src, unsigned *dst)
224 {
225         char *e;
226
227         *dst = strtoul(src, &e, 16);
228         if (e == src || *e || *dst > 255)
229                 return false;
230
231         return true;
232 }
233
234 int system_init(void)
235 {
236         static struct event_socket rtnl_event;
237         static struct event_socket hotplug_event;
238
239         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
240         system_fd_set_cloexec(sock_ioctl);
241
242         // Prepare socket for routing / address control
243         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
244         if (!sock_rtnl)
245                 return -1;
246
247         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
248                 return -1;
249
250         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
251                                      handle_hotplug_event, 0))
252                 return -1;
253
254         // Receive network link events form kernel
255         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
256
257         return 0;
258 }
259
260 static void system_set_sysctl(const char *path, const char *val)
261 {
262         int fd;
263
264         fd = open(path, O_WRONLY);
265         if (fd < 0)
266                 return;
267
268         if (write(fd, val, strlen(val))) {}
269         close(fd);
270 }
271
272 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
273 {
274         snprintf(dev_buf, sizeof(dev_buf), path, device);
275         system_set_sysctl(dev_buf, val);
276 }
277
278 static void system_set_disable_ipv6(struct device *dev, const char *val)
279 {
280         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
281 }
282
283 static void system_set_rpfilter(struct device *dev, const char *val)
284 {
285         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter", dev->ifname, val);
286 }
287
288 static void system_set_acceptlocal(struct device *dev, const char *val)
289 {
290         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local", dev->ifname, val);
291 }
292
293 static void system_set_igmpversion(struct device *dev, const char *val)
294 {
295         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/force_igmp_version", dev->ifname, val);
296 }
297
298 static void system_set_mldversion(struct device *dev, const char *val)
299 {
300         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/force_mld_version", dev->ifname, val);
301 }
302
303 static void system_set_neigh4reachabletime(struct device *dev, const char *val)
304 {
305         system_set_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms", dev->ifname, val);
306 }
307
308 static void system_set_neigh6reachabletime(struct device *dev, const char *val)
309 {
310         system_set_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/base_reachable_time_ms", dev->ifname, val);
311 }
312
313 static void system_set_dadtransmits(struct device *dev, const char *val)
314 {
315         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/dad_transmits", dev->ifname, val);
316 }
317
318 static void system_bridge_set_multicast_to_unicast(struct device *dev, const char *val)
319 {
320         system_set_dev_sysctl("/sys/class/net/%s/brport/multicast_to_unicast", dev->ifname, val);
321 }
322
323 static void system_bridge_set_hairpin_mode(struct device *dev, const char *val)
324 {
325         system_set_dev_sysctl("/sys/class/net/%s/brport/hairpin_mode", dev->ifname, val);
326 }
327
328 static void system_bridge_set_multicast_router(struct device *dev, const char *val, bool bridge)
329 {
330         system_set_dev_sysctl(bridge ? "/sys/class/net/%s/bridge/multicast_router" :
331                                        "/sys/class/net/%s/brport/multicast_router",
332                               dev->ifname, val);
333 }
334
335 static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
336 {
337         int fd = -1, ret = -1;
338
339         fd = open(path, O_RDONLY);
340         if (fd < 0)
341                 goto out;
342
343         ssize_t len = read(fd, buf, buf_sz - 1);
344         if (len < 0)
345                 goto out;
346
347         ret = buf[len] = 0;
348
349 out:
350         if (fd >= 0)
351                 close(fd);
352
353         return ret;
354 }
355
356 static int
357 system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
358 {
359         snprintf(dev_buf, sizeof(dev_buf), path, device);
360         return system_get_sysctl(dev_buf, buf, buf_sz);
361 }
362
363 static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
364 {
365         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
366                         dev->ifname, buf, buf_sz);
367 }
368
369 static int system_get_rpfilter(struct device *dev, char *buf, const size_t buf_sz)
370 {
371         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter",
372                         dev->ifname, buf, buf_sz);
373 }
374
375 static int system_get_acceptlocal(struct device *dev, char *buf, const size_t buf_sz)
376 {
377         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local",
378                         dev->ifname, buf, buf_sz);
379 }
380
381 static int system_get_igmpversion(struct device *dev, char *buf, const size_t buf_sz)
382 {
383         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/force_igmp_version",
384                         dev->ifname, buf, buf_sz);
385 }
386
387 static int system_get_mldversion(struct device *dev, char *buf, const size_t buf_sz)
388 {
389         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/force_mld_version",
390                         dev->ifname, buf, buf_sz);
391 }
392
393 static int system_get_neigh4reachabletime(struct device *dev, char *buf, const size_t buf_sz)
394 {
395         return system_get_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms",
396                         dev->ifname, buf, buf_sz);
397 }
398
399 static int system_get_neigh6reachabletime(struct device *dev, char *buf, const size_t buf_sz)
400 {
401         return system_get_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/base_reachable_time_ms",
402                         dev->ifname, buf, buf_sz);
403 }
404
405 static int system_get_dadtransmits(struct device *dev, char *buf, const size_t buf_sz)
406 {
407         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/dad_transmits",
408                         dev->ifname, buf, buf_sz);
409 }
410
411 // Evaluate netlink messages
412 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
413 {
414         struct nlmsghdr *nh = nlmsg_hdr(msg);
415         struct nlattr *nla[__IFLA_MAX];
416         int link_state = 0;
417         char buf[10];
418
419         if (nh->nlmsg_type != RTM_NEWLINK)
420                 goto out;
421
422         nlmsg_parse(nh, sizeof(struct ifinfomsg), nla, __IFLA_MAX - 1, NULL);
423         if (!nla[IFLA_IFNAME])
424                 goto out;
425
426         struct device *dev = device_get(nla_data(nla[IFLA_IFNAME]), false);
427         if (!dev)
428                 goto out;
429
430         if (!system_get_dev_sysctl("/sys/class/net/%s/carrier", dev->ifname, buf, sizeof(buf)))
431                 link_state = strtoul(buf, NULL, 0);
432
433         device_set_link(dev, link_state ? true : false);
434
435 out:
436         return 0;
437 }
438
439 static void
440 handle_hotplug_msg(char *data, int size)
441 {
442         const char *subsystem = NULL, *interface = NULL;
443         char *cur, *end, *sep;
444         struct device *dev;
445         int skip;
446         bool add;
447
448         if (!strncmp(data, "add@", 4))
449                 add = true;
450         else if (!strncmp(data, "remove@", 7))
451                 add = false;
452         else
453                 return;
454
455         skip = strlen(data) + 1;
456         end = data + size;
457
458         for (cur = data + skip; cur < end; cur += skip) {
459                 skip = strlen(cur) + 1;
460
461                 sep = strchr(cur, '=');
462                 if (!sep)
463                         continue;
464
465                 *sep = 0;
466                 if (!strcmp(cur, "INTERFACE"))
467                         interface = sep + 1;
468                 else if (!strcmp(cur, "SUBSYSTEM")) {
469                         subsystem = sep + 1;
470                         if (strcmp(subsystem, "net") != 0)
471                                 return;
472                 }
473                 if (subsystem && interface)
474                         goto found;
475         }
476         return;
477
478 found:
479         dev = device_get(interface, false);
480         if (!dev)
481                 return;
482
483         if (dev->type != &simple_device_type)
484                 return;
485
486         if (add && system_if_force_external(dev->ifname))
487                 return;
488
489         device_set_present(dev, add);
490 }
491
492 static void
493 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
494 {
495         struct event_socket *ev = container_of(u, struct event_socket, uloop);
496         struct sockaddr_nl nla;
497         unsigned char *buf = NULL;
498         int size;
499
500         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
501                 if (nla.nl_pid == 0)
502                         handle_hotplug_msg((char *) buf, size);
503
504                 free(buf);
505         }
506 }
507
508 static int system_rtnl_call(struct nl_msg *msg)
509 {
510         int ret;
511
512         ret = nl_send_auto_complete(sock_rtnl, msg);
513         nlmsg_free(msg);
514
515         if (ret < 0)
516                 return ret;
517
518         return nl_wait_for_ack(sock_rtnl);
519 }
520
521 int system_bridge_delbr(struct device *bridge)
522 {
523         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
524 }
525
526 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
527 {
528         struct ifreq ifr;
529
530         memset(&ifr, 0, sizeof(ifr));
531         if (dev)
532                 ifr.ifr_ifindex = dev->ifindex;
533         else
534                 ifr.ifr_data = data;
535         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
536         return ioctl(sock_ioctl, cmd, &ifr);
537 }
538
539 static bool system_is_bridge(const char *name, char *buf, int buflen)
540 {
541         struct stat st;
542
543         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
544         if (stat(buf, &st) < 0)
545                 return false;
546
547         return true;
548 }
549
550 static char *system_get_bridge(const char *name, char *buf, int buflen)
551 {
552         char *path;
553         ssize_t len = -1;
554         glob_t gl;
555
556         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
557         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
558                 return NULL;
559
560         if (gl.gl_pathc > 0)
561                 len = readlink(gl.gl_pathv[0], buf, buflen);
562
563         globfree(&gl);
564
565         if (len < 0)
566                 return NULL;
567
568         buf[len] = 0;
569         path = strrchr(buf, '/');
570         if (!path)
571                 return NULL;
572
573         return path + 1;
574 }
575
576 static void
577 system_bridge_set_wireless(struct device *bridge, struct device *dev)
578 {
579         bool mcast_to_ucast = dev->wireless_ap;
580         bool hairpin = true;
581
582         if (bridge->settings.flags & DEV_OPT_MULTICAST_TO_UNICAST &&
583             !bridge->settings.multicast_to_unicast)
584                 mcast_to_ucast = false;
585
586         if (!mcast_to_ucast || dev->wireless_isolate)
587                 hairpin = false;
588
589         system_bridge_set_multicast_to_unicast(dev, mcast_to_ucast ? "1" : "0");
590         system_bridge_set_hairpin_mode(dev, hairpin ? "1" : "0");
591 }
592
593 int system_bridge_addif(struct device *bridge, struct device *dev)
594 {
595         char buf[64];
596         char *oldbr;
597         int ret = 0;
598
599         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
600         if (!oldbr || strcmp(oldbr, bridge->ifname) != 0)
601                 ret = system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
602
603         if (dev->wireless)
604                 system_bridge_set_wireless(bridge, dev);
605
606         if (dev->settings.flags & DEV_OPT_MULTICAST_ROUTER) {
607                 snprintf(buf, sizeof(buf), "%i", dev->settings.multicast_router);
608                 system_bridge_set_multicast_router(dev, buf, false);
609         }
610
611         return ret;
612 }
613
614 int system_bridge_delif(struct device *bridge, struct device *dev)
615 {
616         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
617 }
618
619 int system_if_resolve(struct device *dev)
620 {
621         struct ifreq ifr;
622         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
623         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
624                 return ifr.ifr_ifindex;
625         else
626                 return 0;
627 }
628
629 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
630 {
631         struct ifreq ifr;
632
633         memset(&ifr, 0, sizeof(ifr));
634         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
635         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
636         ifr.ifr_flags |= add;
637         ifr.ifr_flags &= ~rem;
638         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
639 }
640
641 struct clear_data {
642         struct nl_msg *msg;
643         struct device *dev;
644         int type;
645         int size;
646         int af;
647 };
648
649
650 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
651 {
652         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
653
654         return ifa->ifa_index == ifindex;
655 }
656
657 static bool check_route(struct nlmsghdr *hdr, int ifindex)
658 {
659         struct rtmsg *r = NLMSG_DATA(hdr);
660         struct nlattr *tb[__RTA_MAX];
661
662         if (r->rtm_protocol == RTPROT_KERNEL &&
663             r->rtm_family == AF_INET6)
664                 return false;
665
666         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
667         if (!tb[RTA_OIF])
668                 return false;
669
670         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
671 }
672
673 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
674 {
675         return true;
676 }
677
678 static int cb_clear_event(struct nl_msg *msg, void *arg)
679 {
680         struct clear_data *clr = arg;
681         struct nlmsghdr *hdr = nlmsg_hdr(msg);
682         bool (*cb)(struct nlmsghdr *, int ifindex);
683         int type;
684
685         switch(clr->type) {
686         case RTM_GETADDR:
687                 type = RTM_DELADDR;
688                 if (hdr->nlmsg_type != RTM_NEWADDR)
689                         return NL_SKIP;
690
691                 cb = check_ifaddr;
692                 break;
693         case RTM_GETROUTE:
694                 type = RTM_DELROUTE;
695                 if (hdr->nlmsg_type != RTM_NEWROUTE)
696                         return NL_SKIP;
697
698                 cb = check_route;
699                 break;
700         case RTM_GETRULE:
701                 type = RTM_DELRULE;
702                 if (hdr->nlmsg_type != RTM_NEWRULE)
703                         return NL_SKIP;
704
705                 cb = check_rule;
706                 break;
707         default:
708                 return NL_SKIP;
709         }
710
711         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
712                 return NL_SKIP;
713
714         if (type == RTM_DELRULE)
715                 D(SYSTEM, "Remove a rule\n");
716         else
717                 D(SYSTEM, "Remove %s from device %s\n",
718                   type == RTM_DELADDR ? "an address" : "a route",
719                   clr->dev->ifname);
720         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
721         hdr = nlmsg_hdr(clr->msg);
722         hdr->nlmsg_type = type;
723         hdr->nlmsg_flags = NLM_F_REQUEST;
724
725         nl_socket_disable_auto_ack(sock_rtnl);
726         nl_send_auto_complete(sock_rtnl, clr->msg);
727         nl_socket_enable_auto_ack(sock_rtnl);
728
729         return NL_SKIP;
730 }
731
732 static int
733 cb_finish_event(struct nl_msg *msg, void *arg)
734 {
735         int *pending = arg;
736         *pending = 0;
737         return NL_STOP;
738 }
739
740 static int
741 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
742 {
743         int *pending = arg;
744         *pending = err->error;
745         return NL_STOP;
746 }
747
748 static void
749 system_if_clear_entries(struct device *dev, int type, int af)
750 {
751         struct clear_data clr;
752         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
753         struct rtmsg rtm = {
754                 .rtm_family = af,
755                 .rtm_flags = RTM_F_CLONED,
756         };
757         int flags = NLM_F_DUMP;
758         int pending = 1;
759
760         clr.af = af;
761         clr.dev = dev;
762         clr.type = type;
763         switch (type) {
764         case RTM_GETADDR:
765         case RTM_GETRULE:
766                 clr.size = sizeof(struct rtgenmsg);
767                 break;
768         case RTM_GETROUTE:
769                 clr.size = sizeof(struct rtmsg);
770                 break;
771         default:
772                 return;
773         }
774
775         if (!cb)
776                 return;
777
778         clr.msg = nlmsg_alloc_simple(type, flags);
779         if (!clr.msg)
780                 goto out;
781
782         nlmsg_append(clr.msg, &rtm, clr.size, 0);
783         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
784         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
785         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
786
787         nl_send_auto_complete(sock_rtnl, clr.msg);
788         while (pending > 0)
789                 nl_recvmsgs(sock_rtnl, cb);
790
791         nlmsg_free(clr.msg);
792 out:
793         nl_cb_put(cb);
794 }
795
796 /*
797  * Clear bridge (membership) state and bring down device
798  */
799 void system_if_clear_state(struct device *dev)
800 {
801         static char buf[256];
802         char *bridge;
803
804         device_set_ifindex(dev, system_if_resolve(dev));
805         if (dev->external || !dev->ifindex)
806                 return;
807
808         system_if_flags(dev->ifname, 0, IFF_UP);
809
810         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
811                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
812                 system_bridge_delbr(dev);
813                 return;
814         }
815
816         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
817         if (bridge) {
818                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
819                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
820         }
821
822         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
823         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
824         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
825         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
826         system_set_disable_ipv6(dev, "0");
827 }
828
829 static inline unsigned long
830 sec_to_jiffies(int val)
831 {
832         return (unsigned long) val * 100;
833 }
834
835 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
836 {
837         char buf[64];
838         unsigned long args[4] = {};
839
840         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
841                 return -1;
842
843         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
844         args[1] = !!cfg->stp;
845         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
846
847         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
848         args[1] = sec_to_jiffies(cfg->forward_delay);
849         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
850
851         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
852                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
853
854         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier",
855                 bridge->ifname, cfg->multicast_querier ? "1" : "0");
856
857         snprintf(buf, sizeof(buf), "%i", cfg->hash_max);
858         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/hash_max",
859                 bridge->ifname, buf);
860
861         if (bridge->settings.flags & DEV_OPT_MULTICAST_ROUTER) {
862                 snprintf(buf, sizeof(buf), "%i", bridge->settings.multicast_router);
863                 system_bridge_set_multicast_router(bridge, buf, true);
864         }
865
866         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
867         args[1] = cfg->priority;
868         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
869
870         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
871                 args[0] = BRCTL_SET_AGEING_TIME;
872                 args[1] = sec_to_jiffies(cfg->ageing_time);
873                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
874         }
875
876         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
877                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
878                 args[1] = sec_to_jiffies(cfg->hello_time);
879                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
880         }
881
882         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
883                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
884                 args[1] = sec_to_jiffies(cfg->max_age);
885                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
886         }
887
888         return 0;
889 }
890
891 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
892 {
893         struct nl_msg *msg;
894         struct nlattr *linkinfo, *data;
895         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC, };
896         int i, rv;
897         static const struct {
898                 const char *name;
899                 enum macvlan_mode val;
900         } modes[] = {
901                 { "private", MACVLAN_MODE_PRIVATE },
902                 { "vepa", MACVLAN_MODE_VEPA },
903                 { "bridge", MACVLAN_MODE_BRIDGE },
904                 { "passthru", MACVLAN_MODE_PASSTHRU },
905         };
906
907         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
908
909         if (!msg)
910                 return -1;
911
912         nlmsg_append(msg, &iim, sizeof(iim), 0);
913
914         if (cfg->flags & MACVLAN_OPT_MACADDR)
915                 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
916         nla_put_string(msg, IFLA_IFNAME, macvlan->ifname);
917         nla_put_u32(msg, IFLA_LINK, dev->ifindex);
918
919         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
920                 goto nla_put_failure;
921
922         nla_put_string(msg, IFLA_INFO_KIND, "macvlan");
923
924         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
925                 goto nla_put_failure;
926
927         if (cfg->mode) {
928                 for (i = 0; i < ARRAY_SIZE(modes); i++) {
929                         if (strcmp(cfg->mode, modes[i].name) != 0)
930                                 continue;
931
932                         nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
933                         break;
934                 }
935         }
936
937         nla_nest_end(msg, data);
938         nla_nest_end(msg, linkinfo);
939
940         rv = system_rtnl_call(msg);
941         if (rv)
942                 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
943
944         return rv;
945
946 nla_put_failure:
947         nlmsg_free(msg);
948         return -ENOMEM;
949 }
950
951 static int system_link_del(const char *ifname)
952 {
953         struct nl_msg *msg;
954         struct ifinfomsg iim = {
955                 .ifi_family = AF_UNSPEC,
956                 .ifi_index = 0,
957         };
958
959         msg = nlmsg_alloc_simple(RTM_DELLINK, NLM_F_REQUEST);
960
961         if (!msg)
962                 return -1;
963
964         nlmsg_append(msg, &iim, sizeof(iim), 0);
965         nla_put_string(msg, IFLA_IFNAME, ifname);
966         return system_rtnl_call(msg);
967 }
968
969 int system_macvlan_del(struct device *macvlan)
970 {
971         return system_link_del(macvlan->ifname);
972 }
973
974 static int system_vlan(struct device *dev, int id)
975 {
976         struct vlan_ioctl_args ifr = {
977                 .cmd = SET_VLAN_NAME_TYPE_CMD,
978                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
979         };
980
981         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
982
983         if (id < 0) {
984                 ifr.cmd = DEL_VLAN_CMD;
985                 ifr.u.VID = 0;
986         } else {
987                 ifr.cmd = ADD_VLAN_CMD;
988                 ifr.u.VID = id;
989         }
990         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
991         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
992 }
993
994 int system_vlan_add(struct device *dev, int id)
995 {
996         return system_vlan(dev, id);
997 }
998
999 int system_vlan_del(struct device *dev)
1000 {
1001         return system_vlan(dev, -1);
1002 }
1003
1004 int system_vlandev_add(struct device *vlandev, struct device *dev, struct vlandev_config *cfg)
1005 {
1006         struct nl_msg *msg;
1007         struct nlattr *linkinfo, *data;
1008         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC };
1009         int rv;
1010
1011         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
1012
1013         if (!msg)
1014                 return -1;
1015
1016         nlmsg_append(msg, &iim, sizeof(iim), 0);
1017         nla_put_string(msg, IFLA_IFNAME, vlandev->ifname);
1018         nla_put_u32(msg, IFLA_LINK, dev->ifindex);
1019         
1020         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
1021                 goto nla_put_failure;
1022         
1023         nla_put_string(msg, IFLA_INFO_KIND, "vlan");
1024
1025         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
1026                 goto nla_put_failure;
1027
1028         nla_put_u16(msg, IFLA_VLAN_ID, cfg->vid);
1029
1030 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
1031         nla_put_u16(msg, IFLA_VLAN_PROTOCOL, htons(cfg->proto));
1032 #else
1033         if(cfg->proto == VLAN_PROTO_8021AD)
1034                 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);
1035 #endif
1036
1037         nla_nest_end(msg, data);
1038         nla_nest_end(msg, linkinfo);
1039
1040         rv = system_rtnl_call(msg);
1041         if (rv)
1042                 D(SYSTEM, "Error adding vlandev '%s' over '%s': %d\n", vlandev->ifname, dev->ifname, rv);
1043
1044         return rv;
1045
1046 nla_put_failure:
1047         nlmsg_free(msg);
1048         return -ENOMEM;
1049 }
1050
1051 int system_vlandev_del(struct device *vlandev)
1052 {
1053         return system_link_del(vlandev->ifname);
1054 }
1055
1056 void
1057 system_if_get_settings(struct device *dev, struct device_settings *s)
1058 {
1059         struct ifreq ifr;
1060         char buf[10];
1061
1062         memset(&ifr, 0, sizeof(ifr));
1063         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
1064
1065         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
1066                 s->mtu = ifr.ifr_mtu;
1067                 s->flags |= DEV_OPT_MTU;
1068         }
1069
1070         s->mtu6 = system_update_ipv6_mtu(dev, 0);
1071         if (s->mtu6 > 0)
1072                 s->flags |= DEV_OPT_MTU6;
1073
1074         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
1075                 s->txqueuelen = ifr.ifr_qlen;
1076                 s->flags |= DEV_OPT_TXQUEUELEN;
1077         }
1078
1079         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
1080                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
1081                 s->flags |= DEV_OPT_MACADDR;
1082         }
1083
1084         if (!system_get_disable_ipv6(dev, buf, sizeof(buf))) {
1085                 s->ipv6 = !strtoul(buf, NULL, 0);
1086                 s->flags |= DEV_OPT_IPV6;
1087         }
1088
1089         if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) == 0) {
1090                 s->promisc = ifr.ifr_flags & IFF_PROMISC;
1091                 s->flags |= DEV_OPT_PROMISC;
1092         }
1093
1094         if (!system_get_rpfilter(dev, buf, sizeof(buf))) {
1095                 s->rpfilter = strtoul(buf, NULL, 0);
1096                 s->flags |= DEV_OPT_RPFILTER;
1097         }
1098
1099         if (!system_get_acceptlocal(dev, buf, sizeof(buf))) {
1100                 s->acceptlocal = strtoul(buf, NULL, 0);
1101                 s->flags |= DEV_OPT_ACCEPTLOCAL;
1102         }
1103
1104         if (!system_get_igmpversion(dev, buf, sizeof(buf))) {
1105                 s->igmpversion = strtoul(buf, NULL, 0);
1106                 s->flags |= DEV_OPT_IGMPVERSION;
1107         }
1108
1109         if (!system_get_mldversion(dev, buf, sizeof(buf))) {
1110                 s->mldversion = strtoul(buf, NULL, 0);
1111                 s->flags |= DEV_OPT_MLDVERSION;
1112         }
1113
1114         if (!system_get_neigh4reachabletime(dev, buf, sizeof(buf))) {
1115                 s->neigh4reachabletime = strtoul(buf, NULL, 0);
1116                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
1117         }
1118
1119         if (!system_get_neigh6reachabletime(dev, buf, sizeof(buf))) {
1120                 s->neigh6reachabletime = strtoul(buf, NULL, 0);
1121                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
1122         }
1123
1124         if (!system_get_dadtransmits(dev, buf, sizeof(buf))) {
1125                 s->dadtransmits = strtoul(buf, NULL, 0);
1126                 s->flags |= DEV_OPT_DADTRANSMITS;
1127         }
1128 }
1129
1130 static void
1131 system_if_set_rps_xps_val(const char *path, int val)
1132 {
1133         char val_buf[8];
1134         glob_t gl;
1135         int i;
1136
1137         if (glob(path, 0, NULL, &gl))
1138                 return;
1139
1140         snprintf(val_buf, sizeof(val_buf), "%x", val);
1141         for (i = 0; i < gl.gl_pathc; i++)
1142                 system_set_sysctl(gl.gl_pathv[i], val_buf);
1143
1144         globfree(&gl);
1145 }
1146
1147 static void
1148 system_if_apply_rps_xps(struct device *dev, struct device_settings *s)
1149 {
1150         long n_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1151         int val;
1152
1153         if (n_cpus < 2)
1154                 return;
1155
1156         val = (1 << n_cpus) - 1;
1157         snprintf(dev_buf, sizeof(dev_buf), "/sys/class/net/%s/queues/*/rps_cpus", dev->ifname);
1158         system_if_set_rps_xps_val(dev_buf, s->rps ? val : 0);
1159
1160         snprintf(dev_buf, sizeof(dev_buf), "/sys/class/net/%s/queues/*/xps_cpus", dev->ifname);
1161         system_if_set_rps_xps_val(dev_buf, s->xps ? val : 0);
1162 }
1163
1164 void
1165 system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
1166 {
1167         struct ifreq ifr;
1168         char buf[12];
1169
1170         memset(&ifr, 0, sizeof(ifr));
1171         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
1172         if (s->flags & DEV_OPT_MTU & apply_mask) {
1173                 ifr.ifr_mtu = s->mtu;
1174                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
1175                         s->flags &= ~DEV_OPT_MTU;
1176         }
1177         if (s->flags & DEV_OPT_MTU6 & apply_mask) {
1178                 system_update_ipv6_mtu(dev, s->mtu6);
1179         }
1180         if (s->flags & DEV_OPT_TXQUEUELEN & apply_mask) {
1181                 ifr.ifr_qlen = s->txqueuelen;
1182                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
1183                         s->flags &= ~DEV_OPT_TXQUEUELEN;
1184         }
1185         if ((s->flags & DEV_OPT_MACADDR & apply_mask) && !dev->external) {
1186                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
1187                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
1188                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
1189                         s->flags &= ~DEV_OPT_MACADDR;
1190         }
1191         if (s->flags & DEV_OPT_IPV6 & apply_mask)
1192                 system_set_disable_ipv6(dev, s->ipv6 ? "0" : "1");
1193         if (s->flags & DEV_OPT_PROMISC & apply_mask) {
1194                 if (system_if_flags(dev->ifname, s->promisc ? IFF_PROMISC : 0,
1195                                     !s->promisc ? IFF_PROMISC : 0) < 0)
1196                         s->flags &= ~DEV_OPT_PROMISC;
1197         }
1198         if (s->flags & DEV_OPT_RPFILTER & apply_mask) {
1199                 snprintf(buf, sizeof(buf), "%d", s->rpfilter);
1200                 system_set_rpfilter(dev, buf);
1201         }
1202         if (s->flags & DEV_OPT_ACCEPTLOCAL & apply_mask)
1203                 system_set_acceptlocal(dev, s->acceptlocal ? "1" : "0");
1204         if (s->flags & DEV_OPT_IGMPVERSION & apply_mask) {
1205                 snprintf(buf, sizeof(buf), "%d", s->igmpversion);
1206                 system_set_igmpversion(dev, buf);
1207         }
1208         if (s->flags & DEV_OPT_MLDVERSION & apply_mask) {
1209                 snprintf(buf, sizeof(buf), "%d", s->mldversion);
1210                 system_set_mldversion(dev, buf);
1211         }
1212         if (s->flags & DEV_OPT_NEIGHREACHABLETIME & apply_mask) {
1213                 snprintf(buf, sizeof(buf), "%d", s->neigh4reachabletime);
1214                 system_set_neigh4reachabletime(dev, buf);
1215                 snprintf(buf, sizeof(buf), "%d", s->neigh6reachabletime);
1216                 system_set_neigh6reachabletime(dev, buf);
1217         }
1218         if (s->flags & DEV_OPT_DADTRANSMITS & apply_mask) {
1219                 snprintf(buf, sizeof(buf), "%d", s->dadtransmits);
1220                 system_set_dadtransmits(dev, buf);
1221         }
1222
1223         system_if_apply_rps_xps(dev, s);
1224 }
1225
1226 int system_if_up(struct device *dev)
1227 {
1228         system_if_get_settings(dev, &dev->orig_settings);
1229         /* Only keep orig settings based on what needs to be set */
1230         dev->orig_settings.valid_flags = dev->orig_settings.flags;
1231         dev->orig_settings.flags &= dev->settings.flags;
1232         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
1233         return system_if_flags(dev->ifname, IFF_UP, 0);
1234 }
1235
1236 int system_if_down(struct device *dev)
1237 {
1238         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
1239         system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
1240         return ret;
1241 }
1242
1243 struct if_check_data {
1244         struct device *dev;
1245         int pending;
1246         int ret;
1247 };
1248
1249 #ifndef IFF_LOWER_UP
1250 #define IFF_LOWER_UP    0x10000
1251 #endif
1252
1253 static int cb_if_check_valid(struct nl_msg *msg, void *arg)
1254 {
1255         struct nlmsghdr *nh = nlmsg_hdr(msg);
1256         struct ifinfomsg *ifi = NLMSG_DATA(nh);
1257         struct if_check_data *chk = (struct if_check_data *)arg;
1258
1259         if (nh->nlmsg_type != RTM_NEWLINK)
1260                 return NL_SKIP;
1261
1262         device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false);
1263         device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
1264
1265         return NL_OK;
1266 }
1267
1268 static int cb_if_check_ack(struct nl_msg *msg, void *arg)
1269 {
1270         struct if_check_data *chk = (struct if_check_data *)arg;
1271         chk->pending = 0;
1272         return NL_STOP;
1273 }
1274
1275 static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
1276 {
1277         struct if_check_data *chk = (struct if_check_data *)arg;
1278
1279         device_set_present(chk->dev, false);
1280         device_set_link(chk->dev, false);
1281         chk->pending = err->error;
1282
1283         return NL_STOP;
1284 }
1285
1286 int system_if_check(struct device *dev)
1287 {
1288         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
1289         struct nl_msg *msg;
1290         struct ifinfomsg ifi = {
1291                 .ifi_family = AF_UNSPEC,
1292                 .ifi_index = 0,
1293         };
1294         struct if_check_data chk = {
1295                 .dev = dev,
1296                 .pending = 1,
1297         };
1298         int ret = 1;
1299
1300         msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
1301         if (!msg)
1302                 goto out;
1303
1304         if (nlmsg_append(msg, &ifi, sizeof(ifi), 0) ||
1305             nla_put_string(msg, IFLA_IFNAME, dev->ifname))
1306                 goto free;
1307
1308         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk);
1309         nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk);
1310         nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk);
1311
1312         nl_send_auto_complete(sock_rtnl, msg);
1313         while (chk.pending > 0)
1314                 nl_recvmsgs(sock_rtnl, cb);
1315
1316         ret = chk.pending;
1317
1318 free:
1319         nlmsg_free(msg);
1320 out:
1321         nl_cb_put(cb);
1322         return ret;
1323 }
1324
1325 struct device *
1326 system_if_get_parent(struct device *dev)
1327 {
1328         char buf[64], *devname;
1329         int ifindex, iflink, len;
1330         FILE *f;
1331
1332         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
1333         f = fopen(buf, "r");
1334         if (!f)
1335                 return NULL;
1336
1337         len = fread(buf, 1, sizeof(buf) - 1, f);
1338         fclose(f);
1339
1340         if (len <= 0)
1341                 return NULL;
1342
1343         buf[len] = 0;
1344         iflink = strtoul(buf, NULL, 0);
1345         ifindex = system_if_resolve(dev);
1346         if (!iflink || iflink == ifindex)
1347                 return NULL;
1348
1349         devname = if_indextoname(iflink, buf);
1350         if (!devname)
1351                 return NULL;
1352
1353         return device_get(devname, true);
1354 }
1355
1356 static bool
1357 read_string_file(int dir_fd, const char *file, char *buf, int len)
1358 {
1359         bool ret = false;
1360         char *c;
1361         int fd;
1362
1363         fd = openat(dir_fd, file, O_RDONLY);
1364         if (fd < 0)
1365                 return false;
1366
1367 retry:
1368         len = read(fd, buf, len - 1);
1369         if (len < 0) {
1370                 if (errno == EINTR)
1371                         goto retry;
1372         } else if (len > 0) {
1373                         buf[len] = 0;
1374
1375                         c = strchr(buf, '\n');
1376                         if (c)
1377                                 *c = 0;
1378
1379                         ret = true;
1380         }
1381
1382         close(fd);
1383
1384         return ret;
1385 }
1386
1387 static bool
1388 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
1389 {
1390         char buf[64];
1391         bool ret = false;
1392
1393         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
1394         if (ret)
1395                 *val = strtoull(buf, NULL, 0);
1396
1397         return ret;
1398 }
1399
1400 /* Assume advertised flags == supported flags */
1401 static const struct {
1402         uint32_t mask;
1403         const char *name;
1404 } ethtool_link_modes[] = {
1405         { ADVERTISED_10baseT_Half, "10H" },
1406         { ADVERTISED_10baseT_Full, "10F" },
1407         { ADVERTISED_100baseT_Half, "100H" },
1408         { ADVERTISED_100baseT_Full, "100F" },
1409         { ADVERTISED_1000baseT_Half, "1000H" },
1410         { ADVERTISED_1000baseT_Full, "1000F" },
1411 };
1412
1413 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
1414 {
1415         int i;
1416         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
1417                 if (mask & ethtool_link_modes[i].mask)
1418                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
1419         }
1420 }
1421
1422 bool
1423 system_if_force_external(const char *ifname)
1424 {
1425         char buf[64];
1426         struct stat s;
1427
1428         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
1429         return stat(buf, &s) == 0;
1430 }
1431
1432 int
1433 system_if_dump_info(struct device *dev, struct blob_buf *b)
1434 {
1435         struct ethtool_cmd ecmd;
1436         struct ifreq ifr;
1437         char buf[64], *s;
1438         void *c;
1439         int dir_fd;
1440
1441         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
1442         dir_fd = open(buf, O_DIRECTORY);
1443
1444         memset(&ecmd, 0, sizeof(ecmd));
1445         memset(&ifr, 0, sizeof(ifr));
1446         strcpy(ifr.ifr_name, dev->ifname);
1447         ifr.ifr_data = (caddr_t) &ecmd;
1448         ecmd.cmd = ETHTOOL_GSET;
1449
1450         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
1451                 c = blobmsg_open_array(b, "link-advertising");
1452                 system_add_link_modes(b, ecmd.advertising);
1453                 blobmsg_close_array(b, c);
1454
1455                 c = blobmsg_open_array(b, "link-supported");
1456                 system_add_link_modes(b, ecmd.supported);
1457                 blobmsg_close_array(b, c);
1458
1459                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
1460                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
1461                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
1462                 blobmsg_add_string_buffer(b);
1463         }
1464
1465         close(dir_fd);
1466         return 0;
1467 }
1468
1469 int
1470 system_if_dump_stats(struct device *dev, struct blob_buf *b)
1471 {
1472         const char *const counters[] = {
1473                 "collisions",     "rx_frame_errors",   "tx_compressed",
1474                 "multicast",      "rx_length_errors",  "tx_dropped",
1475                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
1476                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
1477                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
1478                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
1479                 "rx_errors",      "tx_bytes",          "tx_window_errors",
1480                 "rx_fifo_errors", "tx_carrier_errors",
1481         };
1482         char buf[64];
1483         int stats_dir;
1484         int i;
1485         uint64_t val = 0;
1486
1487         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
1488         stats_dir = open(buf, O_DIRECTORY);
1489         if (stats_dir < 0)
1490                 return -1;
1491
1492         for (i = 0; i < ARRAY_SIZE(counters); i++)
1493                 if (read_uint64_file(stats_dir, counters[i], &val))
1494                         blobmsg_add_u64(b, counters[i], val);
1495
1496         close(stats_dir);
1497         return 0;
1498 }
1499
1500 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
1501 {
1502         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
1503         int alen = v4 ? 4 : 16;
1504         unsigned int flags = 0;
1505         struct ifaddrmsg ifa = {
1506                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
1507                 .ifa_prefixlen = addr->mask,
1508                 .ifa_index = dev->ifindex,
1509         };
1510
1511         struct nl_msg *msg;
1512         if (cmd == RTM_NEWADDR)
1513                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1514
1515         msg = nlmsg_alloc_simple(cmd, flags);
1516         if (!msg)
1517                 return -1;
1518
1519         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1520         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1521         if (v4) {
1522                 if (addr->broadcast)
1523                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1524                 if (addr->point_to_point)
1525                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1526         } else {
1527                 time_t now = system_get_rtime();
1528                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1529
1530                 if (addr->preferred_until) {
1531                         int64_t preferred = addr->preferred_until - now;
1532                         if (preferred < 0)
1533                                 preferred = 0;
1534                         else if (preferred > UINT32_MAX)
1535                                 preferred = UINT32_MAX;
1536
1537                         cinfo.ifa_prefered = preferred;
1538                 }
1539
1540                 if (addr->valid_until) {
1541                         int64_t valid = addr->valid_until - now;
1542                         if (valid <= 0) {
1543                                 nlmsg_free(msg);
1544                                 return -1;
1545                         }
1546                         else if (valid > UINT32_MAX)
1547                                 valid = UINT32_MAX;
1548
1549                         cinfo.ifa_valid = valid;
1550                 }
1551
1552                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1553
1554                 if (cmd == RTM_NEWADDR && (addr->flags & DEVADDR_OFFLINK))
1555                         nla_put_u32(msg, IFA_FLAGS, IFA_F_NOPREFIXROUTE);
1556         }
1557
1558         return system_rtnl_call(msg);
1559 }
1560
1561 int system_add_address(struct device *dev, struct device_addr *addr)
1562 {
1563         return system_addr(dev, addr, RTM_NEWADDR);
1564 }
1565
1566 int system_del_address(struct device *dev, struct device_addr *addr)
1567 {
1568         return system_addr(dev, addr, RTM_DELADDR);
1569 }
1570
1571 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1572 {
1573         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1574         bool have_gw;
1575         unsigned int flags = 0;
1576
1577         if (alen == 4)
1578                 have_gw = !!route->nexthop.in.s_addr;
1579         else
1580                 have_gw = route->nexthop.in6.s6_addr32[0] ||
1581                         route->nexthop.in6.s6_addr32[1] ||
1582                         route->nexthop.in6.s6_addr32[2] ||
1583                         route->nexthop.in6.s6_addr32[3];
1584
1585         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1586                         ? route->table : RT_TABLE_MAIN;
1587
1588         struct rtmsg rtm = {
1589                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1590                 .rtm_dst_len = route->mask,
1591                 .rtm_src_len = route->sourcemask,
1592                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1593                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
1594                 .rtm_scope = RT_SCOPE_NOWHERE,
1595                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1596                 .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
1597         };
1598         struct nl_msg *msg;
1599
1600         if (cmd == RTM_NEWROUTE) {
1601                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1602
1603                 if (!dev) { // Add null-route
1604                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1605                         rtm.rtm_type = RTN_UNREACHABLE;
1606                 }
1607                 else
1608                         rtm.rtm_scope = (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1609         }
1610
1611         if (route->flags & DEVROUTE_TYPE) {
1612                 rtm.rtm_type = route->type;
1613                 if (!(route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))) {
1614                         if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_BROADCAST ||
1615                             rtm.rtm_type == RTN_NAT || rtm.rtm_type == RTN_ANYCAST)
1616                                 rtm.rtm_table = RT_TABLE_LOCAL;
1617                 }
1618
1619                 if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_NAT) {
1620                         rtm.rtm_scope = RT_SCOPE_HOST;
1621                 } else if (rtm.rtm_type == RTN_BROADCAST || rtm.rtm_type == RTN_MULTICAST ||
1622                                 rtm.rtm_type == RTN_ANYCAST) {
1623                         rtm.rtm_scope = RT_SCOPE_LINK;
1624                 } else if (rtm.rtm_type == RTN_BLACKHOLE || rtm.rtm_type == RTN_UNREACHABLE ||
1625                                 rtm.rtm_type == RTN_PROHIBIT || rtm.rtm_type == RTN_FAILED_POLICY) {
1626                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1627                         dev = NULL;
1628                 }
1629         }
1630
1631         msg = nlmsg_alloc_simple(cmd, flags);
1632         if (!msg)
1633                 return -1;
1634
1635         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1636
1637         if (route->mask)
1638                 nla_put(msg, RTA_DST, alen, &route->addr);
1639
1640         if (route->sourcemask) {
1641                 if (rtm.rtm_family == AF_INET)
1642                         nla_put(msg, RTA_PREFSRC, alen, &route->source);
1643                 else
1644                         nla_put(msg, RTA_SRC, alen, &route->source);
1645         }
1646
1647         if (route->metric > 0)
1648                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1649
1650         if (have_gw)
1651                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1652
1653         if (dev)
1654                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1655
1656         if (table >= 256)
1657                 nla_put_u32(msg, RTA_TABLE, table);
1658
1659         if (route->flags & DEVROUTE_MTU) {
1660                 struct nlattr *metrics;
1661
1662                 if (!(metrics = nla_nest_start(msg, RTA_METRICS)))
1663                         goto nla_put_failure;
1664
1665                 nla_put_u32(msg, RTAX_MTU, route->mtu);
1666
1667                 nla_nest_end(msg, metrics);
1668         }
1669
1670         return system_rtnl_call(msg);
1671
1672 nla_put_failure:
1673         nlmsg_free(msg);
1674         return -ENOMEM;
1675 }
1676
1677 int system_add_route(struct device *dev, struct device_route *route)
1678 {
1679         return system_rt(dev, route, RTM_NEWROUTE);
1680 }
1681
1682 int system_del_route(struct device *dev, struct device_route *route)
1683 {
1684         return system_rt(dev, route, RTM_DELROUTE);
1685 }
1686
1687 int system_flush_routes(void)
1688 {
1689         const char *names[] = {
1690                 "/proc/sys/net/ipv4/route/flush",
1691                 "/proc/sys/net/ipv6/route/flush"
1692         };
1693         int fd, i;
1694
1695         for (i = 0; i < ARRAY_SIZE(names); i++) {
1696                 fd = open(names[i], O_WRONLY);
1697                 if (fd < 0)
1698                         continue;
1699
1700                 if (write(fd, "-1", 2)) {}
1701                 close(fd);
1702         }
1703         return 0;
1704 }
1705
1706 bool system_resolve_rt_type(const char *type, unsigned int *id)
1707 {
1708         return system_rtn_aton(type, id);
1709 }
1710
1711 bool system_resolve_rt_table(const char *name, unsigned int *id)
1712 {
1713         FILE *f;
1714         char *e, buf[128];
1715         unsigned int n, table = RT_TABLE_UNSPEC;
1716
1717         /* first try to parse table as number */
1718         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1719                 table = n;
1720
1721         /* handle well known aliases */
1722         else if (!strcmp(name, "default"))
1723                 table = RT_TABLE_DEFAULT;
1724         else if (!strcmp(name, "main"))
1725                 table = RT_TABLE_MAIN;
1726         else if (!strcmp(name, "local"))
1727                 table = RT_TABLE_LOCAL;
1728         else if (!strcmp(name, "prelocal"))
1729                 table = RT_TABLE_PRELOCAL;
1730
1731         /* try to look up name in /etc/iproute2/rt_tables */
1732         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1733         {
1734                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1735                 {
1736                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1737                                 continue;
1738
1739                         n = strtoul(e, NULL, 10);
1740                         e = strtok(NULL, " \t\n");
1741
1742                         if (e && !strcmp(e, name))
1743                         {
1744                                 table = n;
1745                                 break;
1746                         }
1747                 }
1748
1749                 fclose(f);
1750         }
1751
1752         if (table == RT_TABLE_UNSPEC)
1753                 return false;
1754
1755         *id = table;
1756         return true;
1757 }
1758
1759 bool system_is_default_rt_table(unsigned int id)
1760 {
1761         return (id == RT_TABLE_MAIN);
1762 }
1763
1764 bool system_resolve_rpfilter(const char *filter, unsigned int *id)
1765 {
1766         char *e;
1767         unsigned int n;
1768
1769         if (!strcmp(filter, "strict"))
1770                 n = 1;
1771         else if (!strcmp(filter, "loose"))
1772                 n = 2;
1773         else {
1774                 n = strtoul(filter, &e, 0);
1775                 if (*e || e == filter || n > 2)
1776                         return false;
1777         }
1778
1779         *id = n;
1780         return true;
1781 }
1782
1783 static int system_iprule(struct iprule *rule, int cmd)
1784 {
1785         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1786
1787         struct nl_msg *msg;
1788         struct rtmsg rtm = {
1789                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1790                 .rtm_protocol = RTPROT_STATIC,
1791                 .rtm_scope = RT_SCOPE_UNIVERSE,
1792                 .rtm_table = RT_TABLE_UNSPEC,
1793                 .rtm_type = RTN_UNSPEC,
1794                 .rtm_flags = 0,
1795         };
1796
1797         if (cmd == RTM_NEWRULE)
1798                 rtm.rtm_type = RTN_UNICAST;
1799
1800         if (rule->invert)
1801                 rtm.rtm_flags |= FIB_RULE_INVERT;
1802
1803         if (rule->flags & IPRULE_SRC)
1804                 rtm.rtm_src_len = rule->src_mask;
1805
1806         if (rule->flags & IPRULE_DEST)
1807                 rtm.rtm_dst_len = rule->dest_mask;
1808
1809         if (rule->flags & IPRULE_TOS)
1810                 rtm.rtm_tos = rule->tos;
1811
1812         if (rule->flags & IPRULE_LOOKUP) {
1813                 if (rule->lookup < 256)
1814                         rtm.rtm_table = rule->lookup;
1815         }
1816
1817         if (rule->flags & IPRULE_ACTION)
1818                 rtm.rtm_type = rule->action;
1819         else if (rule->flags & IPRULE_GOTO)
1820                 rtm.rtm_type = FR_ACT_GOTO;
1821         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1822                 rtm.rtm_type = FR_ACT_NOP;
1823
1824         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1825
1826         if (!msg)
1827                 return -1;
1828
1829         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1830
1831         if (rule->flags & IPRULE_IN)
1832                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1833
1834         if (rule->flags & IPRULE_OUT)
1835                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1836
1837         if (rule->flags & IPRULE_SRC)
1838                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1839
1840         if (rule->flags & IPRULE_DEST)
1841                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1842
1843         if (rule->flags & IPRULE_PRIORITY)
1844                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1845         else if (cmd == RTM_NEWRULE)
1846                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1847
1848         if (rule->flags & IPRULE_FWMARK)
1849                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1850
1851         if (rule->flags & IPRULE_FWMASK)
1852                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1853
1854         if (rule->flags & IPRULE_LOOKUP) {
1855                 if (rule->lookup >= 256)
1856                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1857         }
1858
1859         if (rule->flags & IPRULE_GOTO)
1860                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1861
1862         return system_rtnl_call(msg);
1863 }
1864
1865 int system_add_iprule(struct iprule *rule)
1866 {
1867         return system_iprule(rule, RTM_NEWRULE);
1868 }
1869
1870 int system_del_iprule(struct iprule *rule)
1871 {
1872         return system_iprule(rule, RTM_DELRULE);
1873 }
1874
1875 int system_flush_iprules(void)
1876 {
1877         int rv = 0;
1878         struct iprule rule;
1879
1880         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1881         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1882
1883         memset(&rule, 0, sizeof(rule));
1884
1885
1886         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1887
1888         rule.priority = 0;
1889         rule.lookup = RT_TABLE_PRELOCAL;
1890         rv |= system_iprule(&rule, RTM_NEWRULE);
1891
1892         rule.priority = 1;
1893         rule.lookup = RT_TABLE_LOCAL;
1894         rv |= system_iprule(&rule, RTM_NEWRULE);
1895
1896         rule.priority = 32766;
1897         rule.lookup = RT_TABLE_MAIN;
1898         rv |= system_iprule(&rule, RTM_NEWRULE);
1899
1900         rule.priority = 32767;
1901         rule.lookup = RT_TABLE_DEFAULT;
1902         rv |= system_iprule(&rule, RTM_NEWRULE);
1903
1904
1905         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1906
1907         rule.priority = 0;
1908         rule.lookup = RT_TABLE_PRELOCAL;
1909         rv |= system_iprule(&rule, RTM_NEWRULE);
1910
1911         rule.priority = 1;
1912         rule.lookup = RT_TABLE_LOCAL;
1913         rv |= system_iprule(&rule, RTM_NEWRULE);
1914
1915         rule.priority = 32766;
1916         rule.lookup = RT_TABLE_MAIN;
1917         rv |= system_iprule(&rule, RTM_NEWRULE);
1918
1919         return rv;
1920 }
1921
1922 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1923 {
1924         return system_rtn_aton(action, id);
1925 }
1926
1927 time_t system_get_rtime(void)
1928 {
1929         struct timespec ts;
1930         struct timeval tv;
1931
1932         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1933                 return ts.tv_sec;
1934
1935         if (gettimeofday(&tv, NULL) == 0)
1936                 return tv.tv_sec;
1937
1938         return 0;
1939 }
1940
1941 #ifndef IP_DF
1942 #define IP_DF       0x4000
1943 #endif
1944
1945 static int tunnel_ioctl(const char *name, int cmd, void *p)
1946 {
1947         struct ifreq ifr;
1948
1949         memset(&ifr, 0, sizeof(ifr));
1950         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1951         ifr.ifr_ifru.ifru_data = p;
1952         return ioctl(sock_ioctl, cmd, &ifr);
1953 }
1954
1955 #ifdef IFLA_IPTUN_MAX
1956 #define IP6_FLOWINFO_TCLASS     htonl(0x0FF00000)
1957 static int system_add_gre_tunnel(const char *name, const char *kind,
1958                                  const unsigned int link, struct blob_attr **tb, bool v6)
1959 {
1960         struct nl_msg *nlm;
1961         struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
1962         struct blob_attr *cur;
1963         uint32_t ikey = 0, okey = 0, flags = 0, flowinfo = 0;
1964         uint16_t iflags = 0, oflags = 0;
1965         uint8_t tos = 0;
1966         int ret = 0, ttl = 64;
1967
1968         nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
1969         if (!nlm)
1970                 return -1;
1971
1972         nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
1973         nla_put_string(nlm, IFLA_IFNAME, name);
1974
1975         struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
1976         if (!linkinfo) {
1977                 ret = -ENOMEM;
1978                 goto failure;
1979         }
1980
1981         nla_put_string(nlm, IFLA_INFO_KIND, kind);
1982         struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
1983         if (!infodata) {
1984                 ret = -ENOMEM;
1985                 goto failure;
1986         }
1987
1988         if (link)
1989                 nla_put_u32(nlm, IFLA_GRE_LINK, link);
1990
1991         if ((cur = tb[TUNNEL_ATTR_TTL]))
1992                 ttl = blobmsg_get_u32(cur);
1993
1994         nla_put_u8(nlm, IFLA_GRE_TTL, ttl);
1995
1996         if ((cur = tb[TUNNEL_ATTR_TOS])) {
1997                 char *str = blobmsg_get_string(cur);
1998                 if (strcmp(str, "inherit")) {
1999                         unsigned uval;
2000
2001                         if (!system_tos_aton(str, &uval)) {
2002                                 ret = -EINVAL;
2003                                 goto failure;
2004                         }
2005
2006                         if (v6)
2007                                 flowinfo |= htonl(uval << 20) & IP6_FLOWINFO_TCLASS;
2008                         else
2009                                 tos = uval;
2010                 } else {
2011                         if (v6)
2012                                 flags |= IP6_TNL_F_USE_ORIG_TCLASS;
2013                         else
2014                                 tos = 1;
2015                 }
2016         }
2017
2018         if ((cur = tb[TUNNEL_ATTR_INFO]) && (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)) {
2019                 uint8_t icsum, ocsum, iseqno, oseqno;
2020                 if (sscanf(blobmsg_get_string(cur), "%u,%u,%hhu,%hhu,%hhu,%hhu",
2021                         &ikey, &okey, &icsum, &ocsum, &iseqno, &oseqno) < 6) {
2022                         ret = -EINVAL;
2023                         goto failure;
2024                 }
2025
2026                 if (ikey)
2027                         iflags |= GRE_KEY;
2028
2029                 if (okey)
2030                         oflags |= GRE_KEY;
2031
2032                 if (icsum)
2033                         iflags |= GRE_CSUM;
2034
2035                 if (ocsum)
2036                         oflags |= GRE_CSUM;
2037
2038                 if (iseqno)
2039                         iflags |= GRE_SEQ;
2040
2041                 if (oseqno)
2042                         oflags |= GRE_SEQ;
2043         }
2044
2045         if (v6) {
2046                 struct in6_addr in6buf;
2047                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2048                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2049                                 ret = -EINVAL;
2050                                 goto failure;
2051                         }
2052                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(in6buf), &in6buf);
2053                 }
2054
2055                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2056                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2057                                 ret = -EINVAL;
2058                                 goto failure;
2059                         }
2060                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(in6buf), &in6buf);
2061                 }
2062                 nla_put_u8(nlm, IFLA_GRE_ENCAP_LIMIT, 4);
2063
2064                 if (flowinfo)
2065                         nla_put_u32(nlm, IFLA_GRE_FLOWINFO, flowinfo);
2066
2067                 if (flags)
2068                         nla_put_u32(nlm, IFLA_GRE_FLAGS, flags);
2069         } else {
2070                 struct in_addr inbuf;
2071                 bool set_df = true;
2072
2073                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2074                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2075                                 ret = -EINVAL;
2076                                 goto failure;
2077                         }
2078                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(inbuf), &inbuf);
2079                 }
2080
2081                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2082                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2083                                 ret = -EINVAL;
2084                                 goto failure;
2085                         }
2086                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(inbuf), &inbuf);
2087
2088                         if (IN_MULTICAST(ntohl(inbuf.s_addr))) {
2089                                 if (!okey) {
2090                                         okey = inbuf.s_addr;
2091                                         oflags |= GRE_KEY;
2092                                 }
2093
2094                                 if (!ikey) {
2095                                         ikey = inbuf.s_addr;
2096                                         iflags |= GRE_KEY;
2097                                 }
2098                         }
2099                 }
2100
2101                 if ((cur = tb[TUNNEL_ATTR_DF]))
2102                         set_df = blobmsg_get_bool(cur);
2103
2104                 /* ttl !=0 and nopmtudisc are incompatible */
2105                 if (ttl && !set_df) {
2106                         ret = -EINVAL;
2107                         goto failure;
2108                 }
2109
2110                 nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
2111
2112                 nla_put_u8(nlm, IFLA_GRE_TOS, tos);
2113         }
2114
2115         if (oflags)
2116                 nla_put_u16(nlm, IFLA_GRE_OFLAGS, oflags);
2117
2118         if (iflags)
2119                 nla_put_u16(nlm, IFLA_GRE_IFLAGS, iflags);
2120
2121         if (okey)
2122                 nla_put_u32(nlm, IFLA_GRE_OKEY, okey);
2123
2124         if (ikey)
2125                 nla_put_u32(nlm, IFLA_GRE_IKEY, ikey);
2126
2127         nla_nest_end(nlm, infodata);
2128         nla_nest_end(nlm, linkinfo);
2129
2130         return system_rtnl_call(nlm);
2131
2132 failure:
2133         nlmsg_free(nlm);
2134         return ret;
2135 }
2136 #endif
2137
2138 #ifdef IFLA_VTI_MAX
2139 static int system_add_vti_tunnel(const char *name, const char *kind,
2140                                  const unsigned int link, struct blob_attr **tb, bool v6)
2141 {
2142         struct nl_msg *nlm;
2143         struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
2144         struct blob_attr *cur;
2145         uint32_t ikey = 0, okey = 0;
2146         int ret = 0;
2147
2148         nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
2149         if (!nlm)
2150                 return -1;
2151
2152         nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
2153         nla_put_string(nlm, IFLA_IFNAME, name);
2154
2155         struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
2156         if (!linkinfo) {
2157                 ret = -ENOMEM;
2158                 goto failure;
2159         }
2160
2161         nla_put_string(nlm, IFLA_INFO_KIND, kind);
2162         struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
2163         if (!infodata) {
2164                 ret = -ENOMEM;
2165                 goto failure;
2166         }
2167
2168         if (link)
2169                 nla_put_u32(nlm, IFLA_VTI_LINK, link);
2170
2171         if ((cur = tb[TUNNEL_ATTR_INFO]) && (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)) {
2172                 if (sscanf(blobmsg_get_string(cur), "%u,%u",
2173                         &ikey, &okey) < 2) {
2174                         ret = -EINVAL;
2175                         goto failure;
2176                 }
2177         }
2178
2179         if (v6) {
2180                 struct in6_addr in6buf;
2181                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2182                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2183                                 ret = -EINVAL;
2184                                 goto failure;
2185                         }
2186                         nla_put(nlm, IFLA_VTI_LOCAL, sizeof(in6buf), &in6buf);
2187                 }
2188
2189                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2190                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2191                                 ret = -EINVAL;
2192                                 goto failure;
2193                         }
2194                         nla_put(nlm, IFLA_VTI_REMOTE, sizeof(in6buf), &in6buf);
2195                 }
2196
2197         } else {
2198                 struct in_addr inbuf;
2199
2200                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2201                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2202                                 ret = -EINVAL;
2203                                 goto failure;
2204                         }
2205                         nla_put(nlm, IFLA_VTI_LOCAL, sizeof(inbuf), &inbuf);
2206                 }
2207
2208                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2209                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2210                                 ret = -EINVAL;
2211                                 goto failure;
2212                         }
2213                         nla_put(nlm, IFLA_VTI_REMOTE, sizeof(inbuf), &inbuf);
2214                 }
2215
2216         }
2217
2218         if (okey)
2219                 nla_put_u32(nlm, IFLA_VTI_OKEY, okey);
2220
2221         if (ikey)
2222                 nla_put_u32(nlm, IFLA_VTI_IKEY, ikey);
2223
2224         nla_nest_end(nlm, infodata);
2225         nla_nest_end(nlm, linkinfo);
2226
2227         return system_rtnl_call(nlm);
2228
2229 failure:
2230         nlmsg_free(nlm);
2231         return ret;
2232 }
2233 #endif
2234
2235 static int system_add_proto_tunnel(const char *name, const uint8_t proto, const unsigned int link, struct blob_attr **tb)
2236 {
2237         struct blob_attr *cur;
2238         bool set_df = true;
2239         struct ip_tunnel_parm p  = {
2240                 .link = link,
2241                 .iph = {
2242                         .version = 4,
2243                         .ihl = 5,
2244                         .protocol = proto,
2245                 }
2246         };
2247
2248         if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
2249                         inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
2250                 return -EINVAL;
2251
2252         if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
2253                         inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
2254                 return -EINVAL;
2255
2256         if ((cur = tb[TUNNEL_ATTR_DF]))
2257                 set_df = blobmsg_get_bool(cur);
2258
2259         if ((cur = tb[TUNNEL_ATTR_TTL]))
2260                 p.iph.ttl = blobmsg_get_u32(cur);
2261
2262         if ((cur = tb[TUNNEL_ATTR_TOS])) {
2263                 char *str = blobmsg_get_string(cur);
2264                 if (strcmp(str, "inherit")) {
2265                         unsigned uval;
2266
2267                         if (!system_tos_aton(str, &uval))
2268                                 return -EINVAL;
2269
2270                         p.iph.tos = uval;
2271                 } else
2272                         p.iph.tos = 1;
2273         }
2274
2275         p.iph.frag_off = set_df ? htons(IP_DF) : 0;
2276         /* ttl !=0 and nopmtudisc are incompatible */
2277         if (p.iph.ttl && p.iph.frag_off == 0)
2278                 return -EINVAL;
2279
2280         strncpy(p.name, name, sizeof(p.name));
2281
2282         switch (p.iph.protocol) {
2283         case IPPROTO_IPIP:
2284                 return tunnel_ioctl("tunl0", SIOCADDTUNNEL, &p);
2285         case IPPROTO_IPV6:
2286                 return tunnel_ioctl("sit0", SIOCADDTUNNEL, &p);
2287         default:
2288                 break;
2289         }
2290         return -1;
2291 }
2292
2293 static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
2294 {
2295         struct blob_attr *cur;
2296         const char *str;
2297
2298         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
2299                 return -EINVAL;
2300         str = blobmsg_data(cur);
2301
2302         if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
2303             !strcmp(str, "greip6") || !strcmp(str, "gretapip6") ||
2304             !strcmp(str, "vtiip") || !strcmp(str, "vtiip6"))
2305                 return system_link_del(name);
2306         else
2307                 return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
2308 }
2309
2310 int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
2311 {
2312         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
2313
2314         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
2315                 blob_data(attr), blob_len(attr));
2316
2317         return __system_del_ip_tunnel(name, tb);
2318 }
2319
2320 int system_update_ipv6_mtu(struct device *dev, int mtu)
2321 {
2322         int ret = -1;
2323         char buf[64];
2324         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
2325                         dev->ifname);
2326
2327         int fd = open(buf, O_RDWR);
2328
2329         if (!mtu) {
2330                 ssize_t len = read(fd, buf, sizeof(buf) - 1);
2331                 if (len < 0)
2332                         goto out;
2333
2334                 buf[len] = 0;
2335                 ret = atoi(buf);
2336         } else {
2337                 if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) > 0)
2338                         ret = mtu;
2339         }
2340
2341 out:
2342         close(fd);
2343         return ret;
2344 }
2345
2346 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
2347 {
2348         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
2349         struct blob_attr *cur;
2350         const char *str;
2351
2352         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
2353                 blob_data(attr), blob_len(attr));
2354
2355         __system_del_ip_tunnel(name, tb);
2356
2357         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
2358                 return -EINVAL;
2359         str = blobmsg_data(cur);
2360
2361         unsigned int ttl = 0;
2362         if ((cur = tb[TUNNEL_ATTR_TTL])) {
2363                 ttl = blobmsg_get_u32(cur);
2364                 if (ttl > 255)
2365                         return -EINVAL;
2366         }
2367
2368         unsigned int link = 0;
2369         if ((cur = tb[TUNNEL_ATTR_LINK])) {
2370                 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
2371                 if (!iface)
2372                         return -EINVAL;
2373
2374                 if (iface->l3_dev.dev)
2375                         link = iface->l3_dev.dev->ifindex;
2376         }
2377
2378         if (!strcmp(str, "sit")) {
2379                 if (system_add_proto_tunnel(name, IPPROTO_IPV6, link, tb) < 0)
2380                         return -1;
2381
2382 #ifdef SIOCADD6RD
2383                 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
2384                         unsigned int mask;
2385                         struct ip_tunnel_6rd p6;
2386
2387                         memset(&p6, 0, sizeof(p6));
2388
2389                         if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
2390                                                 &p6.prefix, &mask) || mask > 128)
2391                                 return -EINVAL;
2392                         p6.prefixlen = mask;
2393
2394                         if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
2395                                 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
2396                                                         &p6.relay_prefix, &mask) || mask > 32)
2397                                         return -EINVAL;
2398                                 p6.relay_prefixlen = mask;
2399                         }
2400
2401                         if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
2402                                 __system_del_ip_tunnel(name, tb);
2403                                 return -1;
2404                         }
2405                 }
2406 #endif
2407 #ifdef IFLA_IPTUN_MAX
2408         } else if (!strcmp(str, "ipip6")) {
2409                 struct nl_msg *nlm = nlmsg_alloc_simple(RTM_NEWLINK,
2410                                 NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
2411                 struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC };
2412                 int ret = 0;
2413
2414                 if (!nlm)
2415                         return -1;
2416
2417                 nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
2418                 nla_put_string(nlm, IFLA_IFNAME, name);
2419
2420                 if (link)
2421                         nla_put_u32(nlm, IFLA_LINK, link);
2422
2423                 struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
2424                 if (!linkinfo) {
2425                         ret = -ENOMEM;
2426                         goto failure;
2427                 }
2428                 nla_put_string(nlm, IFLA_INFO_KIND, "ip6tnl");
2429                 struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
2430                 if (!infodata) {
2431                         ret = -ENOMEM;
2432                         goto failure;
2433                 }
2434
2435                 if (link)
2436                         nla_put_u32(nlm, IFLA_IPTUN_LINK, link);
2437
2438                 nla_put_u8(nlm, IFLA_IPTUN_PROTO, IPPROTO_IPIP);
2439                 nla_put_u8(nlm, IFLA_IPTUN_TTL, (ttl) ? ttl : 64);
2440                 nla_put_u8(nlm, IFLA_IPTUN_ENCAP_LIMIT, 4);
2441
2442                 struct in6_addr in6buf;
2443                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2444                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2445                                 ret = -EINVAL;
2446                                 goto failure;
2447                         }
2448                         nla_put(nlm, IFLA_IPTUN_LOCAL, sizeof(in6buf), &in6buf);
2449                 }
2450
2451                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2452                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2453                                 ret = -EINVAL;
2454                                 goto failure;
2455                         }
2456                         nla_put(nlm, IFLA_IPTUN_REMOTE, sizeof(in6buf), &in6buf);
2457                 }
2458
2459 #ifdef IFLA_IPTUN_FMR_MAX
2460                 if ((cur = tb[TUNNEL_ATTR_FMRS])) {
2461                         struct nlattr *fmrs = nla_nest_start(nlm, IFLA_IPTUN_FMRS);
2462
2463                         struct blob_attr *fmr;
2464                         unsigned rem, fmrcnt = 0;
2465                         blobmsg_for_each_attr(fmr, cur, rem) {
2466                                 if (blobmsg_type(fmr) != BLOBMSG_TYPE_STRING)
2467                                         continue;
2468
2469                                 unsigned ip4len, ip6len, ealen, offset = 6;
2470                                 char ip6buf[48];
2471                                 char ip4buf[16];
2472
2473                                 if (sscanf(blobmsg_get_string(fmr), "%47[^/]/%u,%15[^/]/%u,%u,%u",
2474                                                 ip6buf, &ip6len, ip4buf, &ip4len, &ealen, &offset) < 5) {
2475                                         ret = -EINVAL;
2476                                         goto failure;
2477                                 }
2478
2479                                 struct in6_addr ip6prefix;
2480                                 struct in_addr ip4prefix;
2481                                 if (inet_pton(AF_INET6, ip6buf, &ip6prefix) != 1 ||
2482                                                 inet_pton(AF_INET, ip4buf, &ip4prefix) != 1) {
2483                                         ret = -EINVAL;
2484                                         goto failure;
2485                                 }
2486
2487                                 struct nlattr *rule = nla_nest_start(nlm, ++fmrcnt);
2488
2489                                 nla_put(nlm, IFLA_IPTUN_FMR_IP6_PREFIX, sizeof(ip6prefix), &ip6prefix);
2490                                 nla_put(nlm, IFLA_IPTUN_FMR_IP4_PREFIX, sizeof(ip4prefix), &ip4prefix);
2491                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, ip6len);
2492                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, ip4len);
2493                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_EA_LEN, ealen);
2494                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_OFFSET, offset);
2495
2496                                 nla_nest_end(nlm, rule);
2497                         }
2498
2499                         nla_nest_end(nlm, fmrs);
2500                 }
2501 #endif
2502
2503                 nla_nest_end(nlm, infodata);
2504                 nla_nest_end(nlm, linkinfo);
2505
2506                 return system_rtnl_call(nlm);
2507 failure:
2508                 nlmsg_free(nlm);
2509                 return ret;
2510         } else if (!strcmp(str, "greip")) {
2511                 return system_add_gre_tunnel(name, "gre", link, tb, false);
2512         } else if (!strcmp(str, "gretapip"))  {
2513                 return system_add_gre_tunnel(name, "gretap", link, tb, false);
2514         } else if (!strcmp(str, "greip6")) {
2515                 return system_add_gre_tunnel(name, "ip6gre", link, tb, true);
2516         } else if (!strcmp(str, "gretapip6")) {
2517                 return system_add_gre_tunnel(name, "ip6gretap", link, tb, true);
2518 #ifdef IFLA_VTI_MAX
2519         } else if (!strcmp(str, "vtiip")) {
2520                 return system_add_vti_tunnel(name, "vti", link, tb, false);
2521         } else if (!strcmp(str, "vtiip6")) {
2522                 return system_add_vti_tunnel(name, "vti6", link, tb, true);
2523 #endif
2524 #endif
2525         } else if (!strcmp(str, "ipip")) {
2526                 return system_add_proto_tunnel(name, IPPROTO_IPIP, link, tb);
2527         }
2528         else
2529                 return -EINVAL;
2530
2531         return 0;
2532 }