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);
42 static char dev_buf[256];
45 handler_nl_event(struct uloop_fd *u, unsigned int events)
47 struct event_socket *ev = container_of(u, struct event_socket, uloop);
48 nl_recvmsgs(ev->sock, ev->cb);
51 static struct nl_sock *
52 create_socket(int protocol, int groups)
56 sock = nl_socket_alloc();
61 nl_join_groups(sock, groups);
63 if (nl_connect(sock, protocol))
70 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
73 ev->sock = create_socket(protocol, groups);
77 ev->uloop.fd = nl_socket_get_fd(ev->sock);
79 uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
84 create_event_socket(struct event_socket *ev, int protocol,
85 int (*cb)(struct nl_msg *msg, void *arg))
87 // Prepare socket for link events
88 ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
92 nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
94 return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
99 static struct event_socket rtnl_event;
100 static struct event_socket hotplug_event;
102 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
103 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
105 // Prepare socket for routing / address control
106 sock_rtnl = create_socket(NETLINK_ROUTE, 0);
110 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
113 if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
114 handle_hotplug_event))
117 // Receive network link events form kernel
118 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
123 static void system_set_sysctl(const char *path, const char *val)
127 fd = open(path, O_WRONLY);
131 write(fd, val, strlen(val));
135 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
137 snprintf(dev_buf, sizeof(dev_buf), path, val);
138 system_set_sysctl(dev_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 static bool system_is_bridge(const char *name, char *buf, int buflen)
265 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
266 if (stat(buf, &st) < 0)
272 static char *system_get_bridge(const char *name, char *buf, int buflen)
278 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
279 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
282 if (gl.gl_pathc == 0)
285 len = readlink(gl.gl_pathv[0], buf, buflen);
290 path = strrchr(buf, '/');
297 int system_bridge_addif(struct device *bridge, struct device *dev)
301 system_set_disable_ipv6(dev, "1");
302 oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
303 if (oldbr && !strcmp(oldbr, bridge->ifname))
306 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
309 int system_bridge_delif(struct device *bridge, struct device *dev)
311 system_set_disable_ipv6(dev, "0");
312 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
315 static int system_if_resolve(struct device *dev)
318 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
319 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
320 return ifr.ifr_ifindex;
325 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
328 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
329 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
330 ifr.ifr_flags |= add;
331 ifr.ifr_flags &= ~rem;
332 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
344 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
346 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
348 return ifa->ifa_index == ifindex;
351 static bool check_route(struct nlmsghdr *hdr, int ifindex)
353 struct nlattr *tb[__RTA_MAX];
355 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
359 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
362 static int cb_clear_event(struct nl_msg *msg, void *arg)
364 struct clear_data *clr = arg;
365 struct nlmsghdr *hdr = nlmsg_hdr(msg);
366 bool (*cb)(struct nlmsghdr *, int ifindex);
372 if (hdr->nlmsg_type != RTM_NEWADDR)
379 if (hdr->nlmsg_type != RTM_NEWROUTE)
388 if (!cb(hdr, clr->dev->ifindex))
391 D(SYSTEM, "Remove %s from device %s\n",
392 type == RTM_DELADDR ? "an address" : "a route",
394 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
395 hdr = nlmsg_hdr(clr->msg);
396 hdr->nlmsg_type = type;
397 hdr->nlmsg_flags = NLM_F_REQUEST;
399 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
400 nl_wait_for_ack(sock_rtnl);
406 cb_finish_event(struct nl_msg *msg, void *arg)
414 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
417 *pending = err->error;
422 system_if_clear_entries(struct device *dev, int type, int af)
424 struct clear_data clr;
425 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
428 .rtm_flags = RTM_F_CLONED,
430 int flags = NLM_F_DUMP;
438 clr.size = sizeof(struct rtgenmsg);
441 clr.size = sizeof(struct rtmsg);
450 clr.msg = nlmsg_alloc_simple(type, flags);
454 nlmsg_append(clr.msg, &rtm, clr.size, 0);
455 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
456 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
457 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
459 nl_send_auto_complete(sock_rtnl, clr.msg);
461 nl_recvmsgs(sock_rtnl, cb);
469 * Clear bridge (membership) state and bring down device
471 void system_if_clear_state(struct device *dev)
473 static char buf[256];
479 dev->ifindex = system_if_resolve(dev);
483 system_if_flags(dev->ifname, 0, IFF_UP);
485 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
486 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
487 system_bridge_delbr(dev);
491 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
493 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
494 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
497 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
498 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
499 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
500 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
501 system_set_disable_ipv6(dev, "0");
504 static inline unsigned long
505 sec_to_jiffies(int val)
507 return (unsigned long) val * 100;
510 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
512 unsigned long args[4] = {};
514 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
517 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
518 args[1] = !!cfg->stp;
519 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
521 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
522 args[1] = sec_to_jiffies(cfg->forward_delay);
523 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
525 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
526 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
528 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
529 args[0] = BRCTL_SET_AGEING_TIME;
530 args[1] = sec_to_jiffies(cfg->ageing_time);
531 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
534 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
535 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
536 args[1] = sec_to_jiffies(cfg->hello_time);
537 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
540 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
541 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
542 args[1] = sec_to_jiffies(cfg->max_age);
543 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
549 static int system_vlan(struct device *dev, int id)
551 struct vlan_ioctl_args ifr = {
552 .cmd = SET_VLAN_NAME_TYPE_CMD,
553 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
556 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
559 ifr.cmd = DEL_VLAN_CMD;
562 ifr.cmd = ADD_VLAN_CMD;
565 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
566 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
569 int system_vlan_add(struct device *dev, int id)
571 return system_vlan(dev, id);
574 int system_vlan_del(struct device *dev)
576 return system_vlan(dev, -1);
580 system_if_get_settings(struct device *dev, struct device_settings *s)
584 memset(&ifr, 0, sizeof(ifr));
585 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
587 if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
588 s->mtu = ifr.ifr_mtu;
589 s->flags |= DEV_OPT_MTU;
592 if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
593 s->txqueuelen = ifr.ifr_qlen;
594 s->flags |= DEV_OPT_TXQUEUELEN;
597 if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
598 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
599 s->flags |= DEV_OPT_MACADDR;
604 system_if_apply_settings(struct device *dev, struct device_settings *s)
608 memset(&ifr, 0, sizeof(ifr));
609 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
610 if (s->flags & DEV_OPT_MTU) {
611 ifr.ifr_mtu = s->mtu;
612 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
613 s->flags &= ~DEV_OPT_MTU;
615 if (s->flags & DEV_OPT_TXQUEUELEN) {
616 ifr.ifr_qlen = s->txqueuelen;
617 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
618 s->flags &= ~DEV_OPT_TXQUEUELEN;
620 if (s->flags & DEV_OPT_MACADDR) {
621 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
622 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
623 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
624 s->flags &= ~DEV_OPT_MACADDR;
628 int system_if_up(struct device *dev)
630 system_if_get_settings(dev, &dev->orig_settings);
631 system_if_apply_settings(dev, &dev->settings);
632 dev->ifindex = system_if_resolve(dev);
633 return system_if_flags(dev->ifname, IFF_UP, 0);
636 int system_if_down(struct device *dev)
638 int ret = system_if_flags(dev->ifname, 0, IFF_UP);
639 dev->orig_settings.flags &= dev->settings.flags;
640 system_if_apply_settings(dev, &dev->orig_settings);
644 int system_if_check(struct device *dev)
646 device_set_present(dev, (system_if_resolve(dev) > 0));
651 system_if_get_parent(struct device *dev)
653 char buf[64], *devname;
654 int ifindex, iflink, len;
657 snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
662 len = fread(buf, 1, sizeof(buf) - 1, f);
669 iflink = strtoul(buf, NULL, 0);
670 ifindex = system_if_resolve(dev);
671 if (!iflink || iflink == ifindex)
674 devname = if_indextoname(iflink, buf);
678 return device_get(devname, true);
682 read_string_file(int dir_fd, const char *file, char *buf, int len)
688 fd = openat(dir_fd, file, O_RDONLY);
693 len = read(fd, buf, len - 1);
697 } else if (len > 0) {
700 c = strchr(buf, '\n');
713 read_int_file(int dir_fd, const char *file, int *val)
718 ret = read_string_file(dir_fd, file, buf, sizeof(buf));
720 *val = strtoul(buf, NULL, 0);
725 /* Assume advertised flags == supported flags */
726 static const struct {
729 } ethtool_link_modes[] = {
730 { ADVERTISED_10baseT_Half, "10H" },
731 { ADVERTISED_10baseT_Full, "10F" },
732 { ADVERTISED_100baseT_Half, "100H" },
733 { ADVERTISED_100baseT_Full, "100F" },
734 { ADVERTISED_1000baseT_Half, "1000H" },
735 { ADVERTISED_1000baseT_Full, "1000F" },
738 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
741 for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
742 if (mask & ethtool_link_modes[i].mask)
743 blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
748 system_if_dump_info(struct device *dev, struct blob_buf *b)
750 struct ethtool_cmd ecmd;
756 snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
757 dir_fd = open(buf, O_DIRECTORY);
759 if (read_int_file(dir_fd, "carrier", &val))
760 blobmsg_add_u8(b, "link", !!val);
762 memset(&ecmd, 0, sizeof(ecmd));
763 memset(&ifr, 0, sizeof(ifr));
764 strcpy(ifr.ifr_name, dev->ifname);
765 ifr.ifr_data = (caddr_t) &ecmd;
766 ecmd.cmd = ETHTOOL_GSET;
768 if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
769 c = blobmsg_open_array(b, "link-advertising");
770 system_add_link_modes(b, ecmd.advertising);
771 blobmsg_close_array(b, c);
773 c = blobmsg_open_array(b, "link-supported");
774 system_add_link_modes(b, ecmd.supported);
775 blobmsg_close_array(b, c);
777 s = blobmsg_alloc_string_buffer(b, "speed", 8);
778 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
779 ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
780 blobmsg_add_string_buffer(b);
788 system_if_dump_stats(struct device *dev, struct blob_buf *b)
790 const char *const counters[] = {
791 "collisions", "rx_frame_errors", "tx_compressed",
792 "multicast", "rx_length_errors", "tx_dropped",
793 "rx_bytes", "rx_missed_errors", "tx_errors",
794 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
795 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
796 "rx_dropped", "tx_aborted_errors", "tx_packets",
797 "rx_errors", "tx_bytes", "tx_window_errors",
798 "rx_fifo_errors", "tx_carrier_errors",
804 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
805 stats_dir = open(buf, O_DIRECTORY);
809 for (i = 0; i < ARRAY_SIZE(counters); i++)
810 if (read_int_file(stats_dir, counters[i], &val))
811 blobmsg_add_u32(b, counters[i], val);
817 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
819 bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
820 int alen = v4 ? 4 : 16;
821 struct ifaddrmsg ifa = {
822 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
823 .ifa_prefixlen = addr->mask,
824 .ifa_index = dev->ifindex,
829 msg = nlmsg_alloc_simple(cmd, 0);
833 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
834 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
836 nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
838 return system_rtnl_call(msg);
841 int system_add_address(struct device *dev, struct device_addr *addr)
843 return system_addr(dev, addr, RTM_NEWADDR);
846 int system_del_address(struct device *dev, struct device_addr *addr)
848 return system_addr(dev, addr, RTM_DELADDR);
851 static int system_rt(struct device *dev, struct device_route *route, int cmd)
853 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
855 unsigned int flags = 0;
856 int ifindex = dev->ifindex;
859 have_gw = !!route->nexthop.in.s_addr;
861 have_gw = route->nexthop.in6.s6_addr32[0] ||
862 route->nexthop.in6.s6_addr32[1] ||
863 route->nexthop.in6.s6_addr32[2] ||
864 route->nexthop.in6.s6_addr32[3];
866 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
867 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
870 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
871 .rtm_dst_len = route->mask,
872 .rtm_table = RT_TABLE_MAIN,
873 .rtm_protocol = RTPROT_BOOT,
875 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
879 if (cmd == RTM_NEWROUTE)
880 flags |= NLM_F_CREATE | NLM_F_REPLACE;
882 msg = nlmsg_alloc_simple(cmd, flags);
886 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
889 nla_put(msg, RTA_DST, alen, &route->addr);
891 if (route->metric >= 0)
892 nla_put_u32(msg, RTA_PRIORITY, route->metric);
895 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
897 if (route->flags & DEVADDR_DEVICE)
898 nla_put_u32(msg, RTA_OIF, ifindex);
900 return system_rtnl_call(msg);
903 int system_add_route(struct device *dev, struct device_route *route)
905 return system_rt(dev, route, RTM_NEWROUTE);
908 int system_del_route(struct device *dev, struct device_route *route)
910 return system_rt(dev, route, RTM_DELROUTE);
913 int system_flush_routes(void)
915 const char *names[] = {
916 "/proc/sys/net/ipv4/route/flush",
917 "/proc/sys/net/ipv6/route/flush"
921 for (i = 0; i < ARRAY_SIZE(names); i++) {
922 fd = open(names[i], O_WRONLY);
932 time_t system_get_rtime(void)
937 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
940 if (gettimeofday(&tv, NULL) == 0)