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>
13 #include <net/if_arp.h>
21 #include <netlink/msg.h>
22 #include <netlink/attr.h>
23 #include <netlink/socket.h>
24 #include <libubox/uloop.h>
31 struct uloop_fd uloop;
36 static int sock_ioctl = -1;
37 static struct nl_sock *sock_rtnl = NULL;
39 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
40 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
43 handler_nl_event(struct uloop_fd *u, unsigned int events)
45 struct event_socket *ev = container_of(u, struct event_socket, uloop);
46 nl_recvmsgs(ev->sock, ev->cb);
49 static struct nl_sock *
50 create_socket(int protocol, int groups)
54 sock = nl_socket_alloc();
59 nl_join_groups(sock, groups);
61 if (nl_connect(sock, protocol))
68 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
71 ev->sock = create_socket(protocol, groups);
75 ev->uloop.fd = nl_socket_get_fd(ev->sock);
77 uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
82 create_event_socket(struct event_socket *ev, int protocol,
83 int (*cb)(struct nl_msg *msg, void *arg))
85 // Prepare socket for link events
86 ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
90 nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
92 return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
97 static struct event_socket rtnl_event;
98 static struct event_socket hotplug_event;
100 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
101 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
103 // Prepare socket for routing / address control
104 sock_rtnl = create_socket(NETLINK_ROUTE, 0);
108 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
111 if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
112 handle_hotplug_event))
115 // Receive network link events form kernel
116 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
121 static void system_set_sysctl(const char *path, const char *val)
125 fd = open(path, O_WRONLY);
129 write(fd, val, strlen(val));
133 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
135 static char buf[256];
137 snprintf(buf, sizeof(buf), path, val);
138 system_set_sysctl(buf, val);
141 static void system_set_disable_ipv6(struct device *dev, const char *val)
143 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
146 // Evaluate netlink messages
147 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
149 struct nlmsghdr *nh = nlmsg_hdr(msg);
150 struct ifinfomsg *ifi = NLMSG_DATA(nh);
151 struct nlattr *nla[__IFLA_MAX];
153 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
156 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
157 if (!nla[IFLA_IFNAME])
160 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
164 dev->ifindex = ifi->ifi_index;
165 /* TODO: parse link status */
172 handle_hotplug_msg(char *data, int size)
174 const char *subsystem = NULL, *interface = NULL;
175 char *cur, *end, *sep;
180 if (!strncmp(data, "add@", 4))
182 else if (!strncmp(data, "remove@", 7))
187 skip = strlen(data) + 1;
190 for (cur = data + skip; cur < end; cur += skip) {
191 skip = strlen(cur) + 1;
193 sep = strchr(cur, '=');
198 if (!strcmp(cur, "INTERFACE"))
200 else if (!strcmp(cur, "SUBSYSTEM")) {
202 if (strcmp(subsystem, "net") != 0)
205 if (subsystem && interface)
211 dev = device_get(interface, false);
215 if (dev->type != &simple_device_type)
218 device_set_present(dev, add);
222 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
224 struct event_socket *ev = container_of(u, struct event_socket, uloop);
225 struct sockaddr_nl nla;
226 unsigned char *buf = NULL;
229 while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
231 handle_hotplug_msg((char *) buf, size);
237 static int system_rtnl_call(struct nl_msg *msg)
239 int s = -(nl_send_auto_complete(sock_rtnl, msg)
240 || nl_wait_for_ack(sock_rtnl));
245 int system_bridge_delbr(struct device *bridge)
247 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
250 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
254 ifr.ifr_ifindex = dev->ifindex;
257 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
258 return ioctl(sock_ioctl, cmd, &ifr);
261 int system_bridge_addif(struct device *bridge, struct device *dev)
263 system_set_disable_ipv6(dev, "1");
264 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
267 int system_bridge_delif(struct device *bridge, struct device *dev)
269 system_set_disable_ipv6(dev, "0");
270 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
273 static bool system_is_bridge(const char *name, char *buf, int buflen)
277 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
278 if (stat(buf, &st) < 0)
284 static char *system_get_bridge(const char *name, char *buf, int buflen)
290 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
291 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
294 if (gl.gl_pathc == 0)
297 len = readlink(gl.gl_pathv[0], buf, buflen);
302 path = strrchr(buf, '/');
309 static int system_if_resolve(struct device *dev)
312 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
313 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
314 return ifr.ifr_ifindex;
319 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
322 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
323 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
324 ifr.ifr_flags |= add;
325 ifr.ifr_flags &= ~rem;
326 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
338 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
340 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
342 return ifa->ifa_index == ifindex;
345 static bool check_route(struct nlmsghdr *hdr, int ifindex)
347 struct nlattr *tb[__RTA_MAX];
349 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
353 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
356 static int cb_clear_event(struct nl_msg *msg, void *arg)
358 struct clear_data *clr = arg;
359 struct nlmsghdr *hdr = nlmsg_hdr(msg);
360 bool (*cb)(struct nlmsghdr *, int ifindex);
366 if (hdr->nlmsg_type != RTM_NEWADDR)
373 if (hdr->nlmsg_type != RTM_NEWROUTE)
382 if (!cb(hdr, clr->dev->ifindex))
385 D(SYSTEM, "Remove %s from device %s\n",
386 type == RTM_DELADDR ? "an address" : "a route",
388 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
389 hdr = nlmsg_hdr(clr->msg);
390 hdr->nlmsg_type = type;
391 hdr->nlmsg_flags = NLM_F_REQUEST;
393 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
394 nl_wait_for_ack(sock_rtnl);
400 cb_finish_event(struct nl_msg *msg, void *arg)
408 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
411 *pending = err->error;
416 system_if_clear_entries(struct device *dev, int type, int af)
418 struct clear_data clr;
419 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
422 .rtm_flags = RTM_F_CLONED,
424 int flags = NLM_F_DUMP;
432 clr.size = sizeof(struct rtgenmsg);
435 clr.size = sizeof(struct rtmsg);
444 clr.msg = nlmsg_alloc_simple(type, flags);
448 nlmsg_append(clr.msg, &rtm, clr.size, 0);
449 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
450 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
451 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
453 nl_send_auto_complete(sock_rtnl, clr.msg);
455 nl_recvmsgs(sock_rtnl, cb);
463 * Clear bridge (membership) state and bring down device
465 void system_if_clear_state(struct device *dev)
467 static char buf[256];
473 dev->ifindex = system_if_resolve(dev);
477 system_if_flags(dev->ifname, 0, IFF_UP);
479 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
480 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
481 system_bridge_delbr(dev);
485 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
487 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
488 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
491 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
492 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
493 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
494 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
495 system_set_disable_ipv6(dev, "0");
498 static inline unsigned long
499 sec_to_jiffies(int val)
501 return (unsigned long) val * 100;
504 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
506 unsigned long args[4] = {};
508 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
511 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
512 args[1] = !!cfg->stp;
513 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
515 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
516 args[1] = sec_to_jiffies(cfg->forward_delay);
517 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
519 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
520 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
522 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
523 args[0] = BRCTL_SET_AGEING_TIME;
524 args[1] = sec_to_jiffies(cfg->ageing_time);
525 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
528 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
529 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
530 args[1] = sec_to_jiffies(cfg->hello_time);
531 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
534 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
535 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
536 args[1] = sec_to_jiffies(cfg->max_age);
537 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
543 static int system_vlan(struct device *dev, int id)
545 struct vlan_ioctl_args ifr = {
546 .cmd = SET_VLAN_NAME_TYPE_CMD,
547 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
550 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
553 ifr.cmd = DEL_VLAN_CMD;
556 ifr.cmd = ADD_VLAN_CMD;
559 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
560 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
563 int system_vlan_add(struct device *dev, int id)
565 return system_vlan(dev, id);
568 int system_vlan_del(struct device *dev)
570 return system_vlan(dev, -1);
574 system_if_get_settings(struct device *dev, struct device_settings *s)
578 memset(&ifr, 0, sizeof(ifr));
579 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
581 if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
582 s->mtu = ifr.ifr_mtu;
583 s->flags |= DEV_OPT_MTU;
586 if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
587 s->txqueuelen = ifr.ifr_qlen;
588 s->flags |= DEV_OPT_TXQUEUELEN;
591 if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
592 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
593 s->flags |= DEV_OPT_MACADDR;
598 system_if_apply_settings(struct device *dev, struct device_settings *s)
602 memset(&ifr, 0, sizeof(ifr));
603 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
604 if (s->flags & DEV_OPT_MTU) {
605 ifr.ifr_mtu = s->mtu;
606 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
607 s->flags &= ~DEV_OPT_MTU;
609 if (s->flags & DEV_OPT_TXQUEUELEN) {
610 ifr.ifr_qlen = s->txqueuelen;
611 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
612 s->flags &= ~DEV_OPT_TXQUEUELEN;
614 if (s->flags & DEV_OPT_MACADDR) {
615 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
616 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
617 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
618 s->flags &= ~DEV_OPT_MACADDR;
622 int system_if_up(struct device *dev)
624 system_if_get_settings(dev, &dev->orig_settings);
625 system_if_apply_settings(dev, &dev->settings);
626 dev->ifindex = system_if_resolve(dev);
627 return system_if_flags(dev->ifname, IFF_UP, 0);
630 int system_if_down(struct device *dev)
632 int ret = system_if_flags(dev->ifname, 0, IFF_UP);
633 dev->orig_settings.flags &= dev->settings.flags;
634 system_if_apply_settings(dev, &dev->orig_settings);
638 int system_if_check(struct device *dev)
640 device_set_present(dev, (system_if_resolve(dev) > 0));
645 system_if_get_parent(struct device *dev)
647 char buf[64], *devname;
648 int ifindex, iflink, len;
651 snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
656 len = fread(buf, 1, sizeof(buf) - 1, f);
663 iflink = strtoul(buf, NULL, 0);
664 ifindex = system_if_resolve(dev);
665 if (!iflink || iflink == ifindex)
668 devname = if_indextoname(iflink, buf);
672 return device_get(devname, true);
676 read_string_file(int dir_fd, const char *file, char *buf, int len)
682 fd = openat(dir_fd, file, O_RDONLY);
687 len = read(fd, buf, len - 1);
691 } else if (len > 0) {
694 c = strchr(buf, '\n');
707 read_int_file(int dir_fd, const char *file, int *val)
712 ret = read_string_file(dir_fd, file, buf, sizeof(buf));
714 *val = strtoul(buf, NULL, 0);
719 /* Assume advertised flags == supported flags */
720 static const struct {
723 } ethtool_link_modes[] = {
724 { ADVERTISED_10baseT_Half, "10H" },
725 { ADVERTISED_10baseT_Full, "10F" },
726 { ADVERTISED_100baseT_Half, "100H" },
727 { ADVERTISED_100baseT_Full, "100F" },
728 { ADVERTISED_1000baseT_Half, "1000H" },
729 { ADVERTISED_1000baseT_Full, "1000F" },
732 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
735 for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
736 if (mask & ethtool_link_modes[i].mask)
737 blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
742 system_if_dump_info(struct device *dev, struct blob_buf *b)
744 struct ethtool_cmd ecmd;
750 snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
751 dir_fd = open(buf, O_DIRECTORY);
753 if (read_int_file(dir_fd, "carrier", &val))
754 blobmsg_add_u8(b, "link", !!val);
756 memset(&ecmd, 0, sizeof(ecmd));
757 memset(&ifr, 0, sizeof(ifr));
758 strcpy(ifr.ifr_name, dev->ifname);
759 ifr.ifr_data = (caddr_t) &ecmd;
760 ecmd.cmd = ETHTOOL_GSET;
762 if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
763 c = blobmsg_open_array(b, "link-advertising");
764 system_add_link_modes(b, ecmd.advertising);
765 blobmsg_close_array(b, c);
767 c = blobmsg_open_array(b, "link-supported");
768 system_add_link_modes(b, ecmd.supported);
769 blobmsg_close_array(b, c);
771 s = blobmsg_alloc_string_buffer(b, "speed", 8);
772 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
773 ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
774 blobmsg_add_string_buffer(b);
782 system_if_dump_stats(struct device *dev, struct blob_buf *b)
784 const char *const counters[] = {
785 "collisions", "rx_frame_errors", "tx_compressed",
786 "multicast", "rx_length_errors", "tx_dropped",
787 "rx_bytes", "rx_missed_errors", "tx_errors",
788 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
789 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
790 "rx_dropped", "tx_aborted_errors", "tx_packets",
791 "rx_errors", "tx_bytes", "tx_window_errors",
792 "rx_fifo_errors", "tx_carrier_errors",
798 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
799 stats_dir = open(buf, O_DIRECTORY);
803 for (i = 0; i < ARRAY_SIZE(counters); i++)
804 if (read_int_file(stats_dir, counters[i], &val))
805 blobmsg_add_u32(b, counters[i], val);
811 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
813 bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
814 int alen = v4 ? 4 : 16;
815 struct ifaddrmsg ifa = {
816 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
817 .ifa_prefixlen = addr->mask,
818 .ifa_index = dev->ifindex,
823 msg = nlmsg_alloc_simple(cmd, 0);
827 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
828 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
830 nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
832 return system_rtnl_call(msg);
835 int system_add_address(struct device *dev, struct device_addr *addr)
837 return system_addr(dev, addr, RTM_NEWADDR);
840 int system_del_address(struct device *dev, struct device_addr *addr)
842 return system_addr(dev, addr, RTM_DELADDR);
845 static int system_rt(struct device *dev, struct device_route *route, int cmd)
847 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
849 unsigned int flags = 0;
850 int ifindex = dev->ifindex;
853 have_gw = !!route->nexthop.in.s_addr;
855 have_gw = route->nexthop.in6.s6_addr32[0] ||
856 route->nexthop.in6.s6_addr32[1] ||
857 route->nexthop.in6.s6_addr32[2] ||
858 route->nexthop.in6.s6_addr32[3];
860 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
861 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
864 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
865 .rtm_dst_len = route->mask,
866 .rtm_table = RT_TABLE_MAIN,
867 .rtm_protocol = RTPROT_BOOT,
869 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
873 if (cmd == RTM_NEWROUTE)
874 flags |= NLM_F_CREATE | NLM_F_REPLACE;
876 msg = nlmsg_alloc_simple(cmd, flags);
880 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
883 nla_put(msg, RTA_DST, alen, &route->addr);
885 if (route->metric >= 0)
886 nla_put_u32(msg, RTA_PRIORITY, route->metric);
889 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
891 if (route->flags & DEVADDR_DEVICE)
892 nla_put_u32(msg, RTA_OIF, ifindex);
894 return system_rtnl_call(msg);
897 int system_add_route(struct device *dev, struct device_route *route)
899 return system_rt(dev, route, RTM_NEWROUTE);
902 int system_del_route(struct device *dev, struct device_route *route)
904 return system_rt(dev, route, RTM_DELROUTE);
907 int system_flush_routes(void)
909 const char *names[] = {
910 "/proc/sys/net/ipv4/route/flush",
911 "/proc/sys/net/ipv6/route/flush"
915 for (i = 0; i < ARRAY_SIZE(names); i++) {
916 fd = open(names[i], O_WRONLY);
926 time_t system_get_rtime(void)
931 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
934 if (gettimeofday(&tv, NULL) == 0)