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);
38 static void handler_nl_event(struct uloop_fd *u, unsigned int events)
40 struct event_socket *ev = container_of(u, struct event_socket, uloop);
41 nl_recvmsgs(ev->sock, ev->cb);
46 static struct event_socket rtnl_event = {
47 .uloop.cb = handler_nl_event,
50 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
51 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
53 // Prepare socket for routing / address control
54 sock_rtnl = nl_socket_alloc();
58 if (nl_connect(sock_rtnl, NETLINK_ROUTE))
61 // Prepare socket for link events
62 rtnl_event.cb = nl_cb_alloc(NL_CB_DEFAULT);
66 nl_cb_set(rtnl_event.cb, NL_CB_VALID, NL_CB_CUSTOM,
69 rtnl_event.sock = nl_socket_alloc();
73 if (nl_connect(rtnl_event.sock, NETLINK_ROUTE))
76 // Receive network link events form kernel
77 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
79 rtnl_event.uloop.fd = nl_socket_get_fd(rtnl_event.sock);
80 uloop_fd_add(&rtnl_event.uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
85 static void system_set_sysctl(const char *path, const char *val)
89 fd = open(path, O_WRONLY);
93 write(fd, val, strlen(val));
97 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
101 snprintf(buf, sizeof(buf), path, val);
102 system_set_sysctl(buf, val);
105 static void system_set_disable_ipv6(struct device *dev, const char *val)
107 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
110 // Evaluate netlink messages
111 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
113 struct nlmsghdr *nh = nlmsg_hdr(msg);
114 struct ifinfomsg *ifi = NLMSG_DATA(nh);
115 struct nlattr *nla[__IFLA_MAX];
117 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
120 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
121 if (!nla[IFLA_IFNAME])
124 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
128 dev->ifindex = ifi->ifi_index;
129 device_set_present(dev, (nh->nlmsg_type == RTM_NEWLINK));
135 static int system_rtnl_call(struct nl_msg *msg)
137 int s = -(nl_send_auto_complete(sock_rtnl, msg)
138 || nl_wait_for_ack(sock_rtnl));
143 int system_bridge_delbr(struct device *bridge)
145 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
148 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
152 ifr.ifr_ifindex = dev->ifindex;
155 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
156 return ioctl(sock_ioctl, cmd, &ifr);
159 int system_bridge_addif(struct device *bridge, struct device *dev)
161 system_set_disable_ipv6(dev, "1");
162 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
165 int system_bridge_delif(struct device *bridge, struct device *dev)
167 system_set_disable_ipv6(dev, "0");
168 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
171 static bool system_is_bridge(const char *name, char *buf, int buflen)
175 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
176 if (stat(buf, &st) < 0)
182 static char *system_get_bridge(const char *name, char *buf, int buflen)
188 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
189 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
192 if (gl.gl_pathc == 0)
195 len = readlink(gl.gl_pathv[0], buf, buflen);
200 path = strrchr(buf, '/');
207 static int system_if_resolve(struct device *dev)
210 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
211 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
212 return ifr.ifr_ifindex;
217 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
220 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
221 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
222 ifr.ifr_flags |= add;
223 ifr.ifr_flags &= ~rem;
224 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
236 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
238 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
240 return ifa->ifa_index == ifindex;
243 static bool check_route(struct nlmsghdr *hdr, int ifindex)
245 struct nlattr *tb[__RTA_MAX];
247 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
251 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
254 static int cb_clear_event(struct nl_msg *msg, void *arg)
256 struct clear_data *clr = arg;
257 struct nlmsghdr *hdr = nlmsg_hdr(msg);
258 bool (*cb)(struct nlmsghdr *, int ifindex);
264 if (hdr->nlmsg_type != RTM_NEWADDR)
271 if (hdr->nlmsg_type != RTM_NEWROUTE)
280 if (!cb(hdr, clr->dev->ifindex))
283 D(SYSTEM, "Remove %s from device %s\n",
284 type == RTM_DELADDR ? "an address" : "a route",
286 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
287 hdr = nlmsg_hdr(clr->msg);
288 hdr->nlmsg_type = type;
289 hdr->nlmsg_flags = NLM_F_REQUEST;
291 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
292 nl_wait_for_ack(sock_rtnl);
298 cb_finish_event(struct nl_msg *msg, void *arg)
306 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
309 *pending = err->error;
314 system_if_clear_entries(struct device *dev, int type, int af)
316 struct clear_data clr;
317 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
320 .rtm_flags = RTM_F_CLONED,
322 int flags = NLM_F_DUMP;
330 clr.size = sizeof(struct rtgenmsg);
333 clr.size = sizeof(struct rtmsg);
342 clr.msg = nlmsg_alloc_simple(type, flags);
346 nlmsg_append(clr.msg, &rtm, clr.size, 0);
347 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
348 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
349 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
351 nl_send_auto_complete(sock_rtnl, clr.msg);
353 nl_recvmsgs(sock_rtnl, cb);
361 * Clear bridge (membership) state and bring down device
363 void system_if_clear_state(struct device *dev)
365 static char buf[256];
371 dev->ifindex = system_if_resolve(dev);
375 system_if_flags(dev->ifname, 0, IFF_UP);
377 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
378 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
379 system_bridge_delbr(dev);
383 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
385 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
386 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
389 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
390 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
391 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
392 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
393 system_set_disable_ipv6(dev, "0");
396 static inline unsigned long
397 sec_to_jiffies(int val)
399 return (unsigned long) val * 100;
402 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
404 unsigned long args[4] = {};
406 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
409 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
410 args[1] = !!cfg->stp;
411 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
413 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
414 args[1] = sec_to_jiffies(cfg->forward_delay);
415 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
417 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
418 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
420 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
421 args[0] = BRCTL_SET_AGEING_TIME;
422 args[1] = sec_to_jiffies(cfg->ageing_time);
423 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
426 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
427 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
428 args[1] = sec_to_jiffies(cfg->hello_time);
429 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
432 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
433 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
434 args[1] = sec_to_jiffies(cfg->max_age);
435 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
441 static int system_vlan(struct device *dev, int id)
443 struct vlan_ioctl_args ifr = {
444 .cmd = SET_VLAN_NAME_TYPE_CMD,
445 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
448 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
451 ifr.cmd = DEL_VLAN_CMD;
454 ifr.cmd = ADD_VLAN_CMD;
457 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
458 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
461 int system_vlan_add(struct device *dev, int id)
463 return system_vlan(dev, id);
466 int system_vlan_del(struct device *dev)
468 return system_vlan(dev, -1);
472 system_if_apply_settings(struct device *dev)
476 memset(&ifr, 0, sizeof(ifr));
477 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
478 if (dev->flags & DEV_OPT_MTU) {
479 ifr.ifr_mtu = dev->mtu;
480 ioctl(sock_ioctl, SIOCSIFMTU, &ifr);
482 if (dev->flags & DEV_OPT_TXQUEUELEN) {
483 ifr.ifr_qlen = dev->txqueuelen;
484 ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr);
486 if (dev->flags & DEV_OPT_MACADDR) {
487 memcpy(&ifr.ifr_hwaddr, dev->macaddr, sizeof(dev->macaddr));
488 ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr);
491 dev->ifindex = system_if_resolve(dev);
494 int system_if_up(struct device *dev)
496 system_if_apply_settings(dev);
497 return system_if_flags(dev->ifname, IFF_UP, 0);
500 int system_if_down(struct device *dev)
502 return system_if_flags(dev->ifname, 0, IFF_UP);
505 int system_if_check(struct device *dev)
507 device_set_present(dev, (system_if_resolve(dev) >= 0));
511 int system_if_dump_stats(struct device *dev, struct blob_buf *b)
513 const char *const counters[] = {
514 "collisions", "rx_frame_errors", "tx_compressed",
515 "multicast", "rx_length_errors", "tx_dropped",
516 "rx_bytes", "rx_missed_errors", "tx_errors",
517 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
518 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
519 "rx_dropped", "tx_aborted_errors", "tx_packets",
520 "rx_errors", "tx_bytes", "tx_window_errors",
521 "rx_fifo_errors", "tx_carrier_errors",
527 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
528 stats_dir = open(buf, O_DIRECTORY);
532 for (i = 0; i < ARRAY_SIZE(counters); i++) {
533 fd = openat(stats_dir, counters[i], O_RDONLY);
538 len = read(fd, buf, sizeof(buf));
546 blobmsg_add_u32(b, counters[i], strtoul(buf, NULL, 0));
554 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
556 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
557 struct ifaddrmsg ifa = {
558 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
559 .ifa_prefixlen = addr->mask,
560 .ifa_index = dev->ifindex,
570 ifa.ifa_index = dev->ifindex;
573 msg = nlmsg_alloc_simple(cmd, 0);
577 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
578 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
579 return system_rtnl_call(msg);
582 int system_add_address(struct device *dev, struct device_addr *addr)
584 return system_addr(dev, addr, RTM_NEWADDR);
587 int system_del_address(struct device *dev, struct device_addr *addr)
589 return system_addr(dev, addr, RTM_DELADDR);
592 static int system_rt(struct device *dev, struct device_route *route, int cmd)
594 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
596 unsigned int flags = 0;
597 int ifindex = dev->ifindex;
600 have_gw = !!route->nexthop.in.s_addr;
602 have_gw = route->nexthop.in6.s6_addr32[0] ||
603 route->nexthop.in6.s6_addr32[1] ||
604 route->nexthop.in6.s6_addr32[2] ||
605 route->nexthop.in6.s6_addr32[3];
607 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
608 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
611 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
612 .rtm_dst_len = route->mask,
613 .rtm_table = RT_TABLE_MAIN,
614 .rtm_protocol = RTPROT_BOOT,
616 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
620 if (cmd == RTM_NEWROUTE)
621 flags |= NLM_F_CREATE | NLM_F_REPLACE;
628 ifindex = dev->ifindex;
631 msg = nlmsg_alloc_simple(cmd, flags);
635 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
638 nla_put(msg, RTA_DST, alen, &route->addr);
641 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
643 if (route->flags & DEVADDR_DEVICE)
644 nla_put_u32(msg, RTA_OIF, ifindex);
646 return system_rtnl_call(msg);
649 int system_add_route(struct device *dev, struct device_route *route)
651 return system_rt(dev, route, RTM_NEWROUTE);
654 int system_del_route(struct device *dev, struct device_route *route)
656 return system_rt(dev, route, RTM_DELROUTE);
659 int system_flush_routes(void)
661 const char *names[] = {
662 "/proc/sys/net/ipv4/route/flush",
663 "/proc/sys/net/ipv6/route/flush"
667 for (i = 0; i < ARRAY_SIZE(names); i++) {
668 fd = open(names[i], O_WRONLY);
678 time_t system_get_rtime(void)
683 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
686 if (gettimeofday(&tv, NULL) == 0)