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>
12 #include <linux/ethtool.h>
20 #include <netlink/msg.h>
21 #include <netlink/attr.h>
22 #include <netlink/socket.h>
23 #include <libubox/uloop.h>
30 struct uloop_fd uloop;
35 static int sock_ioctl = -1;
36 static struct nl_sock *sock_rtnl = NULL;
38 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
39 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
42 handler_nl_event(struct uloop_fd *u, unsigned int events)
44 struct event_socket *ev = container_of(u, struct event_socket, uloop);
45 nl_recvmsgs(ev->sock, ev->cb);
48 static struct nl_sock *
49 create_socket(int protocol, int groups)
53 sock = nl_socket_alloc();
58 nl_join_groups(sock, groups);
60 if (nl_connect(sock, protocol))
67 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
70 ev->sock = create_socket(protocol, groups);
74 ev->uloop.fd = nl_socket_get_fd(ev->sock);
76 uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
81 create_event_socket(struct event_socket *ev, int protocol,
82 int (*cb)(struct nl_msg *msg, void *arg))
84 // Prepare socket for link events
85 ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
89 nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
91 return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
96 static struct event_socket rtnl_event;
97 static struct event_socket hotplug_event;
99 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
100 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
102 // Prepare socket for routing / address control
103 sock_rtnl = create_socket(NETLINK_ROUTE, 0);
107 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
110 if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
111 handle_hotplug_event))
114 // Receive network link events form kernel
115 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
120 static void system_set_sysctl(const char *path, const char *val)
124 fd = open(path, O_WRONLY);
128 write(fd, val, strlen(val));
132 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
134 static char buf[256];
136 snprintf(buf, sizeof(buf), path, val);
137 system_set_sysctl(buf, val);
140 static void system_set_disable_ipv6(struct device *dev, const char *val)
142 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
145 // Evaluate netlink messages
146 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
148 struct nlmsghdr *nh = nlmsg_hdr(msg);
149 struct ifinfomsg *ifi = NLMSG_DATA(nh);
150 struct nlattr *nla[__IFLA_MAX];
152 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
155 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
156 if (!nla[IFLA_IFNAME])
159 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
163 dev->ifindex = ifi->ifi_index;
164 /* TODO: parse link status */
171 handle_hotplug_msg(char *data, int size)
173 const char *subsystem = NULL, *interface = NULL;
174 char *cur, *end, *sep;
179 if (!strncmp(data, "add@", 4))
181 else if (!strncmp(data, "remove@", 7))
186 skip = strlen(data) + 1;
189 for (cur = data + skip; cur < end; cur += skip) {
190 skip = strlen(cur) + 1;
192 sep = strchr(cur, '=');
197 if (!strcmp(cur, "INTERFACE"))
199 else if (!strcmp(cur, "SUBSYSTEM")) {
201 if (strcmp(subsystem, "net") != 0)
204 if (subsystem && interface)
210 dev = device_get(interface, false);
214 if (dev->type != &simple_device_type)
217 device_set_present(dev, add);
221 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
223 struct event_socket *ev = container_of(u, struct event_socket, uloop);
224 struct sockaddr_nl nla;
225 unsigned char *buf = NULL;
228 while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
230 handle_hotplug_msg((char *) buf, size);
236 static int system_rtnl_call(struct nl_msg *msg)
238 int s = -(nl_send_auto_complete(sock_rtnl, msg)
239 || nl_wait_for_ack(sock_rtnl));
244 int system_bridge_delbr(struct device *bridge)
246 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
249 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
253 ifr.ifr_ifindex = dev->ifindex;
256 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
257 return ioctl(sock_ioctl, cmd, &ifr);
260 int system_bridge_addif(struct device *bridge, struct device *dev)
262 system_set_disable_ipv6(dev, "1");
263 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
266 int system_bridge_delif(struct device *bridge, struct device *dev)
268 system_set_disable_ipv6(dev, "0");
269 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
272 static bool system_is_bridge(const char *name, char *buf, int buflen)
276 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
277 if (stat(buf, &st) < 0)
283 static char *system_get_bridge(const char *name, char *buf, int buflen)
289 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
290 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
293 if (gl.gl_pathc == 0)
296 len = readlink(gl.gl_pathv[0], buf, buflen);
301 path = strrchr(buf, '/');
308 static int system_if_resolve(struct device *dev)
311 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
312 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
313 return ifr.ifr_ifindex;
318 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
321 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
322 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
323 ifr.ifr_flags |= add;
324 ifr.ifr_flags &= ~rem;
325 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
337 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
339 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
341 return ifa->ifa_index == ifindex;
344 static bool check_route(struct nlmsghdr *hdr, int ifindex)
346 struct nlattr *tb[__RTA_MAX];
348 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
352 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
355 static int cb_clear_event(struct nl_msg *msg, void *arg)
357 struct clear_data *clr = arg;
358 struct nlmsghdr *hdr = nlmsg_hdr(msg);
359 bool (*cb)(struct nlmsghdr *, int ifindex);
365 if (hdr->nlmsg_type != RTM_NEWADDR)
372 if (hdr->nlmsg_type != RTM_NEWROUTE)
381 if (!cb(hdr, clr->dev->ifindex))
384 D(SYSTEM, "Remove %s from device %s\n",
385 type == RTM_DELADDR ? "an address" : "a route",
387 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
388 hdr = nlmsg_hdr(clr->msg);
389 hdr->nlmsg_type = type;
390 hdr->nlmsg_flags = NLM_F_REQUEST;
392 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
393 nl_wait_for_ack(sock_rtnl);
399 cb_finish_event(struct nl_msg *msg, void *arg)
407 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
410 *pending = err->error;
415 system_if_clear_entries(struct device *dev, int type, int af)
417 struct clear_data clr;
418 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
421 .rtm_flags = RTM_F_CLONED,
423 int flags = NLM_F_DUMP;
431 clr.size = sizeof(struct rtgenmsg);
434 clr.size = sizeof(struct rtmsg);
443 clr.msg = nlmsg_alloc_simple(type, flags);
447 nlmsg_append(clr.msg, &rtm, clr.size, 0);
448 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
449 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
450 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
452 nl_send_auto_complete(sock_rtnl, clr.msg);
454 nl_recvmsgs(sock_rtnl, cb);
462 * Clear bridge (membership) state and bring down device
464 void system_if_clear_state(struct device *dev)
466 static char buf[256];
472 dev->ifindex = system_if_resolve(dev);
476 system_if_flags(dev->ifname, 0, IFF_UP);
478 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
479 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
480 system_bridge_delbr(dev);
484 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
486 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
487 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
490 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
491 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
492 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
493 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
494 system_set_disable_ipv6(dev, "0");
497 static inline unsigned long
498 sec_to_jiffies(int val)
500 return (unsigned long) val * 100;
503 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
505 unsigned long args[4] = {};
507 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
510 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
511 args[1] = !!cfg->stp;
512 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
514 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
515 args[1] = sec_to_jiffies(cfg->forward_delay);
516 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
518 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
519 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
521 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
522 args[0] = BRCTL_SET_AGEING_TIME;
523 args[1] = sec_to_jiffies(cfg->ageing_time);
524 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
527 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
528 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
529 args[1] = sec_to_jiffies(cfg->hello_time);
530 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
533 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
534 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
535 args[1] = sec_to_jiffies(cfg->max_age);
536 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
542 static int system_vlan(struct device *dev, int id)
544 struct vlan_ioctl_args ifr = {
545 .cmd = SET_VLAN_NAME_TYPE_CMD,
546 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
549 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
552 ifr.cmd = DEL_VLAN_CMD;
555 ifr.cmd = ADD_VLAN_CMD;
558 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
559 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
562 int system_vlan_add(struct device *dev, int id)
564 return system_vlan(dev, id);
567 int system_vlan_del(struct device *dev)
569 return system_vlan(dev, -1);
573 system_if_apply_settings(struct device *dev, struct device_settings *s)
577 memset(&ifr, 0, sizeof(ifr));
578 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
579 if (s->flags & DEV_OPT_MTU) {
580 ifr.ifr_mtu = s->mtu;
581 ioctl(sock_ioctl, SIOCSIFMTU, &ifr);
583 if (s->flags & DEV_OPT_TXQUEUELEN) {
584 ifr.ifr_qlen = s->txqueuelen;
585 ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr);
587 if (s->flags & DEV_OPT_MACADDR) {
588 memcpy(&ifr.ifr_hwaddr, s->macaddr, sizeof(s->macaddr));
589 ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr);
593 int system_if_up(struct device *dev)
595 system_if_apply_settings(dev, &dev->settings);
596 dev->ifindex = system_if_resolve(dev);
597 return system_if_flags(dev->ifname, IFF_UP, 0);
600 int system_if_down(struct device *dev)
602 return system_if_flags(dev->ifname, 0, IFF_UP);
605 int system_if_check(struct device *dev)
607 device_set_present(dev, (system_if_resolve(dev) > 0));
612 system_if_get_parent(struct device *dev)
614 char buf[64], *devname;
615 int ifindex, iflink, len;
618 snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
623 len = fread(buf, 1, sizeof(buf) - 1, f);
630 iflink = strtoul(buf, NULL, 0);
631 ifindex = system_if_resolve(dev);
632 if (!iflink || iflink == ifindex)
635 devname = if_indextoname(iflink, buf);
639 return device_get(devname, true);
643 read_string_file(int dir_fd, const char *file, char *buf, int len)
649 fd = openat(dir_fd, file, O_RDONLY);
654 len = read(fd, buf, len - 1);
658 } else if (len > 0) {
661 c = strchr(buf, '\n');
674 read_int_file(int dir_fd, const char *file, int *val)
679 ret = read_string_file(dir_fd, file, buf, sizeof(buf));
681 *val = strtoul(buf, NULL, 0);
686 /* Assume advertised flags == supported flags */
687 static const struct {
690 } ethtool_link_modes[] = {
691 { ADVERTISED_10baseT_Half, "10H" },
692 { ADVERTISED_10baseT_Full, "10F" },
693 { ADVERTISED_100baseT_Half, "100H" },
694 { ADVERTISED_100baseT_Full, "100F" },
695 { ADVERTISED_1000baseT_Half, "1000H" },
696 { ADVERTISED_1000baseT_Full, "1000F" },
699 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
702 for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
703 if (mask & ethtool_link_modes[i].mask)
704 blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
709 system_if_dump_info(struct device *dev, struct blob_buf *b)
711 struct ethtool_cmd ecmd;
717 snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
718 dir_fd = open(buf, O_DIRECTORY);
720 if (read_int_file(dir_fd, "carrier", &val))
721 blobmsg_add_u8(b, "link", !!val);
722 if (read_string_file(dir_fd, "address", buf, sizeof(buf)))
723 blobmsg_add_string(b, "macaddr", buf);
725 memset(&ecmd, 0, sizeof(ecmd));
726 memset(&ifr, 0, sizeof(ifr));
727 strcpy(ifr.ifr_name, dev->ifname);
728 ifr.ifr_data = (caddr_t) &ecmd;
729 ecmd.cmd = ETHTOOL_GSET;
731 if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
732 c = blobmsg_open_array(b, "link-advertising");
733 system_add_link_modes(b, ecmd.advertising);
734 blobmsg_close_array(b, c);
736 c = blobmsg_open_array(b, "link-supported");
737 system_add_link_modes(b, ecmd.supported);
738 blobmsg_close_array(b, c);
740 s = blobmsg_alloc_string_buffer(b, "speed", 8);
741 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
742 ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
743 blobmsg_add_string_buffer(b);
751 system_if_dump_stats(struct device *dev, struct blob_buf *b)
753 const char *const counters[] = {
754 "collisions", "rx_frame_errors", "tx_compressed",
755 "multicast", "rx_length_errors", "tx_dropped",
756 "rx_bytes", "rx_missed_errors", "tx_errors",
757 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
758 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
759 "rx_dropped", "tx_aborted_errors", "tx_packets",
760 "rx_errors", "tx_bytes", "tx_window_errors",
761 "rx_fifo_errors", "tx_carrier_errors",
767 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
768 stats_dir = open(buf, O_DIRECTORY);
772 for (i = 0; i < ARRAY_SIZE(counters); i++)
773 if (read_int_file(stats_dir, counters[i], &val))
774 blobmsg_add_u32(b, counters[i], val);
780 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
782 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
783 struct ifaddrmsg ifa = {
784 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
785 .ifa_prefixlen = addr->mask,
786 .ifa_index = dev->ifindex,
796 ifa.ifa_index = dev->ifindex;
799 msg = nlmsg_alloc_simple(cmd, 0);
803 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
804 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
805 return system_rtnl_call(msg);
808 int system_add_address(struct device *dev, struct device_addr *addr)
810 return system_addr(dev, addr, RTM_NEWADDR);
813 int system_del_address(struct device *dev, struct device_addr *addr)
815 return system_addr(dev, addr, RTM_DELADDR);
818 static int system_rt(struct device *dev, struct device_route *route, int cmd)
820 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
822 unsigned int flags = 0;
823 int ifindex = dev->ifindex;
826 have_gw = !!route->nexthop.in.s_addr;
828 have_gw = route->nexthop.in6.s6_addr32[0] ||
829 route->nexthop.in6.s6_addr32[1] ||
830 route->nexthop.in6.s6_addr32[2] ||
831 route->nexthop.in6.s6_addr32[3];
833 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
834 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
837 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
838 .rtm_dst_len = route->mask,
839 .rtm_table = RT_TABLE_MAIN,
840 .rtm_protocol = RTPROT_BOOT,
842 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
846 if (cmd == RTM_NEWROUTE)
847 flags |= NLM_F_CREATE | NLM_F_REPLACE;
854 ifindex = dev->ifindex;
857 msg = nlmsg_alloc_simple(cmd, flags);
861 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
864 nla_put(msg, RTA_DST, alen, &route->addr);
867 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
869 if (route->flags & DEVADDR_DEVICE)
870 nla_put_u32(msg, RTA_OIF, ifindex);
872 return system_rtnl_call(msg);
875 int system_add_route(struct device *dev, struct device_route *route)
877 return system_rt(dev, route, RTM_NEWROUTE);
880 int system_del_route(struct device *dev, struct device_route *route)
882 return system_rt(dev, route, RTM_DELROUTE);
885 int system_flush_routes(void)
887 const char *names[] = {
888 "/proc/sys/net/ipv4/route/flush",
889 "/proc/sys/net/ipv6/route/flush"
893 for (i = 0; i < ARRAY_SIZE(names); i++) {
894 fd = open(names[i], O_WRONLY);
904 time_t system_get_rtime(void)
909 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
912 if (gettimeofday(&tv, NULL) == 0)