3 #include <sys/socket.h>
6 #include <sys/syscall.h>
8 #include <linux/rtnetlink.h>
9 #include <linux/sockios.h>
10 #include <linux/if_vlan.h>
11 #include <linux/if_bridge.h>
18 #include <netlink/msg.h>
19 #include <netlink/attr.h>
20 #include <netlink/socket.h>
21 #include <libubox/uloop.h>
28 struct uloop_fd uloop;
33 static int sock_ioctl = -1;
34 static struct nl_sock *sock_rtnl = NULL;
36 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
39 handler_nl_event(struct uloop_fd *u, unsigned int events)
41 struct event_socket *ev = container_of(u, struct event_socket, uloop);
42 nl_recvmsgs(ev->sock, ev->cb);
46 create_event_socket(struct event_socket *ev, int protocol,
47 int (*cb)(struct nl_msg *msg, void *arg))
49 // Prepare socket for link events
50 ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
54 nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
56 ev->sock = nl_socket_alloc();
60 if (nl_connect(ev->sock, protocol))
63 ev->uloop.fd = nl_socket_get_fd(ev->sock);
64 ev->uloop.cb = handler_nl_event;
65 uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
71 static struct event_socket rtnl_event;
73 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
74 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
76 // Prepare socket for routing / address control
77 sock_rtnl = nl_socket_alloc();
81 if (nl_connect(sock_rtnl, NETLINK_ROUTE))
84 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
87 // Receive network link events form kernel
88 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
94 static void system_set_sysctl(const char *path, const char *val)
98 fd = open(path, O_WRONLY);
102 write(fd, val, strlen(val));
106 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
108 static char buf[256];
110 snprintf(buf, sizeof(buf), path, val);
111 system_set_sysctl(buf, val);
114 static void system_set_disable_ipv6(struct device *dev, const char *val)
116 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
119 // Evaluate netlink messages
120 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
122 struct nlmsghdr *nh = nlmsg_hdr(msg);
123 struct ifinfomsg *ifi = NLMSG_DATA(nh);
124 struct nlattr *nla[__IFLA_MAX];
126 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
129 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
130 if (!nla[IFLA_IFNAME])
133 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
137 dev->ifindex = ifi->ifi_index;
138 device_set_present(dev, (nh->nlmsg_type == RTM_NEWLINK));
144 static int system_rtnl_call(struct nl_msg *msg)
146 int s = -(nl_send_auto_complete(sock_rtnl, msg)
147 || nl_wait_for_ack(sock_rtnl));
152 int system_bridge_delbr(struct device *bridge)
154 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
157 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
161 ifr.ifr_ifindex = dev->ifindex;
164 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
165 return ioctl(sock_ioctl, cmd, &ifr);
168 int system_bridge_addif(struct device *bridge, struct device *dev)
170 system_set_disable_ipv6(dev, "1");
171 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
174 int system_bridge_delif(struct device *bridge, struct device *dev)
176 system_set_disable_ipv6(dev, "0");
177 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
180 static bool system_is_bridge(const char *name, char *buf, int buflen)
184 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
185 if (stat(buf, &st) < 0)
191 static char *system_get_bridge(const char *name, char *buf, int buflen)
197 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
198 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
201 if (gl.gl_pathc == 0)
204 len = readlink(gl.gl_pathv[0], buf, buflen);
209 path = strrchr(buf, '/');
216 static int system_if_resolve(struct device *dev)
219 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
220 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
221 return ifr.ifr_ifindex;
226 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
229 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
230 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
231 ifr.ifr_flags |= add;
232 ifr.ifr_flags &= ~rem;
233 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
245 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
247 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
249 return ifa->ifa_index == ifindex;
252 static bool check_route(struct nlmsghdr *hdr, int ifindex)
254 struct nlattr *tb[__RTA_MAX];
256 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
260 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
263 static int cb_clear_event(struct nl_msg *msg, void *arg)
265 struct clear_data *clr = arg;
266 struct nlmsghdr *hdr = nlmsg_hdr(msg);
267 bool (*cb)(struct nlmsghdr *, int ifindex);
273 if (hdr->nlmsg_type != RTM_NEWADDR)
280 if (hdr->nlmsg_type != RTM_NEWROUTE)
289 if (!cb(hdr, clr->dev->ifindex))
292 D(SYSTEM, "Remove %s from device %s\n",
293 type == RTM_DELADDR ? "an address" : "a route",
295 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
296 hdr = nlmsg_hdr(clr->msg);
297 hdr->nlmsg_type = type;
298 hdr->nlmsg_flags = NLM_F_REQUEST;
300 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
301 nl_wait_for_ack(sock_rtnl);
307 cb_finish_event(struct nl_msg *msg, void *arg)
315 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
318 *pending = err->error;
323 system_if_clear_entries(struct device *dev, int type, int af)
325 struct clear_data clr;
326 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
329 .rtm_flags = RTM_F_CLONED,
331 int flags = NLM_F_DUMP;
339 clr.size = sizeof(struct rtgenmsg);
342 clr.size = sizeof(struct rtmsg);
351 clr.msg = nlmsg_alloc_simple(type, flags);
355 nlmsg_append(clr.msg, &rtm, clr.size, 0);
356 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
357 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
358 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
360 nl_send_auto_complete(sock_rtnl, clr.msg);
362 nl_recvmsgs(sock_rtnl, cb);
370 * Clear bridge (membership) state and bring down device
372 void system_if_clear_state(struct device *dev)
374 static char buf[256];
380 dev->ifindex = system_if_resolve(dev);
384 system_if_flags(dev->ifname, 0, IFF_UP);
386 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
387 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
388 system_bridge_delbr(dev);
392 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
394 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
395 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
398 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
399 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
400 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
401 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
402 system_set_disable_ipv6(dev, "0");
405 static inline unsigned long
406 sec_to_jiffies(int val)
408 return (unsigned long) val * 100;
411 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
413 unsigned long args[4] = {};
415 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
418 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
419 args[1] = !!cfg->stp;
420 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
422 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
423 args[1] = sec_to_jiffies(cfg->forward_delay);
424 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
426 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
427 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
429 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
430 args[0] = BRCTL_SET_AGEING_TIME;
431 args[1] = sec_to_jiffies(cfg->ageing_time);
432 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
435 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
436 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
437 args[1] = sec_to_jiffies(cfg->hello_time);
438 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
441 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
442 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
443 args[1] = sec_to_jiffies(cfg->max_age);
444 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
450 static int system_vlan(struct device *dev, int id)
452 struct vlan_ioctl_args ifr = {
453 .cmd = SET_VLAN_NAME_TYPE_CMD,
454 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
457 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
460 ifr.cmd = DEL_VLAN_CMD;
463 ifr.cmd = ADD_VLAN_CMD;
466 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
467 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
470 int system_vlan_add(struct device *dev, int id)
472 return system_vlan(dev, id);
475 int system_vlan_del(struct device *dev)
477 return system_vlan(dev, -1);
481 system_if_apply_settings(struct device *dev)
485 memset(&ifr, 0, sizeof(ifr));
486 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
487 if (dev->flags & DEV_OPT_MTU) {
488 ifr.ifr_mtu = dev->mtu;
489 ioctl(sock_ioctl, SIOCSIFMTU, &ifr);
491 if (dev->flags & DEV_OPT_TXQUEUELEN) {
492 ifr.ifr_qlen = dev->txqueuelen;
493 ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr);
495 if (dev->flags & DEV_OPT_MACADDR) {
496 memcpy(&ifr.ifr_hwaddr, dev->macaddr, sizeof(dev->macaddr));
497 ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr);
500 dev->ifindex = system_if_resolve(dev);
503 int system_if_up(struct device *dev)
505 system_if_apply_settings(dev);
506 return system_if_flags(dev->ifname, IFF_UP, 0);
509 int system_if_down(struct device *dev)
511 return system_if_flags(dev->ifname, 0, IFF_UP);
514 int system_if_check(struct device *dev)
516 device_set_present(dev, (system_if_resolve(dev) >= 0));
520 int system_if_dump_stats(struct device *dev, struct blob_buf *b)
522 const char *const counters[] = {
523 "collisions", "rx_frame_errors", "tx_compressed",
524 "multicast", "rx_length_errors", "tx_dropped",
525 "rx_bytes", "rx_missed_errors", "tx_errors",
526 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
527 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
528 "rx_dropped", "tx_aborted_errors", "tx_packets",
529 "rx_errors", "tx_bytes", "tx_window_errors",
530 "rx_fifo_errors", "tx_carrier_errors",
536 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
537 stats_dir = open(buf, O_DIRECTORY);
541 for (i = 0; i < ARRAY_SIZE(counters); i++) {
542 fd = openat(stats_dir, counters[i], O_RDONLY);
547 len = read(fd, buf, sizeof(buf));
555 blobmsg_add_u32(b, counters[i], strtoul(buf, NULL, 0));
563 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
565 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
566 struct ifaddrmsg ifa = {
567 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
568 .ifa_prefixlen = addr->mask,
569 .ifa_index = dev->ifindex,
579 ifa.ifa_index = dev->ifindex;
582 msg = nlmsg_alloc_simple(cmd, 0);
586 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
587 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
588 return system_rtnl_call(msg);
591 int system_add_address(struct device *dev, struct device_addr *addr)
593 return system_addr(dev, addr, RTM_NEWADDR);
596 int system_del_address(struct device *dev, struct device_addr *addr)
598 return system_addr(dev, addr, RTM_DELADDR);
601 static int system_rt(struct device *dev, struct device_route *route, int cmd)
603 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
605 unsigned int flags = 0;
606 int ifindex = dev->ifindex;
609 have_gw = !!route->nexthop.in.s_addr;
611 have_gw = route->nexthop.in6.s6_addr32[0] ||
612 route->nexthop.in6.s6_addr32[1] ||
613 route->nexthop.in6.s6_addr32[2] ||
614 route->nexthop.in6.s6_addr32[3];
616 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
617 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
620 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
621 .rtm_dst_len = route->mask,
622 .rtm_table = RT_TABLE_MAIN,
623 .rtm_protocol = RTPROT_BOOT,
625 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
629 if (cmd == RTM_NEWROUTE)
630 flags |= NLM_F_CREATE | NLM_F_REPLACE;
637 ifindex = dev->ifindex;
640 msg = nlmsg_alloc_simple(cmd, flags);
644 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
647 nla_put(msg, RTA_DST, alen, &route->addr);
650 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
652 if (route->flags & DEVADDR_DEVICE)
653 nla_put_u32(msg, RTA_OIF, ifindex);
655 return system_rtnl_call(msg);
658 int system_add_route(struct device *dev, struct device_route *route)
660 return system_rt(dev, route, RTM_NEWROUTE);
663 int system_del_route(struct device *dev, struct device_route *route)
665 return system_rt(dev, route, RTM_DELROUTE);
668 int system_flush_routes(void)
670 const char *names[] = {
671 "/proc/sys/net/ipv4/route/flush",
672 "/proc/sys/net/ipv6/route/flush"
676 for (i = 0; i < ARRAY_SIZE(names); i++) {
677 fd = open(names[i], O_WRONLY);
687 time_t system_get_rtime(void)
692 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
695 if (gettimeofday(&tv, NULL) == 0)