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>
19 #include <netlink/msg.h>
20 #include <netlink/attr.h>
21 #include <netlink/socket.h>
22 #include <libubox/uloop.h>
29 struct uloop_fd uloop;
34 static int sock_ioctl = -1;
35 static struct nl_sock *sock_rtnl = NULL;
37 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
38 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
41 handler_nl_event(struct uloop_fd *u, unsigned int events)
43 struct event_socket *ev = container_of(u, struct event_socket, uloop);
44 nl_recvmsgs(ev->sock, ev->cb);
47 static struct nl_sock *
48 create_socket(int protocol, int groups)
52 sock = nl_socket_alloc();
57 nl_join_groups(sock, groups);
59 if (nl_connect(sock, protocol))
66 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
69 ev->sock = create_socket(protocol, groups);
73 ev->uloop.fd = nl_socket_get_fd(ev->sock);
75 uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
80 create_event_socket(struct event_socket *ev, int protocol,
81 int (*cb)(struct nl_msg *msg, void *arg))
83 // Prepare socket for link events
84 ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
88 nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
90 return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
95 static struct event_socket rtnl_event;
96 static struct event_socket hotplug_event;
98 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
99 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
101 // Prepare socket for routing / address control
102 sock_rtnl = create_socket(NETLINK_ROUTE, 0);
106 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
109 if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
110 handle_hotplug_event))
113 // Receive network link events form kernel
114 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
119 static void system_set_sysctl(const char *path, const char *val)
123 fd = open(path, O_WRONLY);
127 write(fd, val, strlen(val));
131 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
133 static char buf[256];
135 snprintf(buf, sizeof(buf), path, val);
136 system_set_sysctl(buf, val);
139 static void system_set_disable_ipv6(struct device *dev, const char *val)
141 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
144 // Evaluate netlink messages
145 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
147 struct nlmsghdr *nh = nlmsg_hdr(msg);
148 struct ifinfomsg *ifi = NLMSG_DATA(nh);
149 struct nlattr *nla[__IFLA_MAX];
151 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
154 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
155 if (!nla[IFLA_IFNAME])
158 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
162 dev->ifindex = ifi->ifi_index;
163 /* TODO: parse link status */
170 handle_hotplug_msg(char *data, int size)
172 const char *subsystem = NULL, *interface = NULL;
173 char *cur, *end, *sep;
178 if (!strncmp(data, "add@", 4))
180 else if (!strncmp(data, "remove@", 7))
185 skip = strlen(data) + 1;
188 for (cur = data + skip; cur < end; cur += skip) {
189 skip = strlen(cur) + 1;
191 sep = strchr(cur, '=');
196 if (!strcmp(cur, "INTERFACE"))
198 else if (!strcmp(cur, "SUBSYSTEM")) {
200 if (strcmp(subsystem, "net") != 0)
203 if (subsystem && interface)
209 dev = device_get(interface, false);
213 if (dev->type != &simple_device_type)
216 device_set_present(dev, add);
220 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
222 struct event_socket *ev = container_of(u, struct event_socket, uloop);
223 struct sockaddr_nl nla;
224 unsigned char *buf = NULL;
227 while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
229 handle_hotplug_msg((char *) buf, size);
235 static int system_rtnl_call(struct nl_msg *msg)
237 int s = -(nl_send_auto_complete(sock_rtnl, msg)
238 || nl_wait_for_ack(sock_rtnl));
243 int system_bridge_delbr(struct device *bridge)
245 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
248 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
252 ifr.ifr_ifindex = dev->ifindex;
255 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
256 return ioctl(sock_ioctl, cmd, &ifr);
259 int system_bridge_addif(struct device *bridge, struct device *dev)
261 system_set_disable_ipv6(dev, "1");
262 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
265 int system_bridge_delif(struct device *bridge, struct device *dev)
267 system_set_disable_ipv6(dev, "0");
268 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
271 static bool system_is_bridge(const char *name, char *buf, int buflen)
275 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
276 if (stat(buf, &st) < 0)
282 static char *system_get_bridge(const char *name, char *buf, int buflen)
288 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
289 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
292 if (gl.gl_pathc == 0)
295 len = readlink(gl.gl_pathv[0], buf, buflen);
300 path = strrchr(buf, '/');
307 static int system_if_resolve(struct device *dev)
310 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
311 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
312 return ifr.ifr_ifindex;
317 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
320 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
321 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
322 ifr.ifr_flags |= add;
323 ifr.ifr_flags &= ~rem;
324 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
336 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
338 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
340 return ifa->ifa_index == ifindex;
343 static bool check_route(struct nlmsghdr *hdr, int ifindex)
345 struct nlattr *tb[__RTA_MAX];
347 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
351 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
354 static int cb_clear_event(struct nl_msg *msg, void *arg)
356 struct clear_data *clr = arg;
357 struct nlmsghdr *hdr = nlmsg_hdr(msg);
358 bool (*cb)(struct nlmsghdr *, int ifindex);
364 if (hdr->nlmsg_type != RTM_NEWADDR)
371 if (hdr->nlmsg_type != RTM_NEWROUTE)
380 if (!cb(hdr, clr->dev->ifindex))
383 D(SYSTEM, "Remove %s from device %s\n",
384 type == RTM_DELADDR ? "an address" : "a route",
386 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
387 hdr = nlmsg_hdr(clr->msg);
388 hdr->nlmsg_type = type;
389 hdr->nlmsg_flags = NLM_F_REQUEST;
391 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
392 nl_wait_for_ack(sock_rtnl);
398 cb_finish_event(struct nl_msg *msg, void *arg)
406 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
409 *pending = err->error;
414 system_if_clear_entries(struct device *dev, int type, int af)
416 struct clear_data clr;
417 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
420 .rtm_flags = RTM_F_CLONED,
422 int flags = NLM_F_DUMP;
430 clr.size = sizeof(struct rtgenmsg);
433 clr.size = sizeof(struct rtmsg);
442 clr.msg = nlmsg_alloc_simple(type, flags);
446 nlmsg_append(clr.msg, &rtm, clr.size, 0);
447 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
448 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
449 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
451 nl_send_auto_complete(sock_rtnl, clr.msg);
453 nl_recvmsgs(sock_rtnl, cb);
461 * Clear bridge (membership) state and bring down device
463 void system_if_clear_state(struct device *dev)
465 static char buf[256];
471 dev->ifindex = system_if_resolve(dev);
475 system_if_flags(dev->ifname, 0, IFF_UP);
477 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
478 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
479 system_bridge_delbr(dev);
483 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
485 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
486 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
489 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
490 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
491 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
492 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
493 system_set_disable_ipv6(dev, "0");
496 static inline unsigned long
497 sec_to_jiffies(int val)
499 return (unsigned long) val * 100;
502 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
504 unsigned long args[4] = {};
506 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
509 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
510 args[1] = !!cfg->stp;
511 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
513 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
514 args[1] = sec_to_jiffies(cfg->forward_delay);
515 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
517 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
518 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
520 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
521 args[0] = BRCTL_SET_AGEING_TIME;
522 args[1] = sec_to_jiffies(cfg->ageing_time);
523 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
526 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
527 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
528 args[1] = sec_to_jiffies(cfg->hello_time);
529 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
532 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
533 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
534 args[1] = sec_to_jiffies(cfg->max_age);
535 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
541 static int system_vlan(struct device *dev, int id)
543 struct vlan_ioctl_args ifr = {
544 .cmd = SET_VLAN_NAME_TYPE_CMD,
545 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
548 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
551 ifr.cmd = DEL_VLAN_CMD;
554 ifr.cmd = ADD_VLAN_CMD;
557 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
558 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
561 int system_vlan_add(struct device *dev, int id)
563 return system_vlan(dev, id);
566 int system_vlan_del(struct device *dev)
568 return system_vlan(dev, -1);
572 system_if_apply_settings(struct device *dev)
576 memset(&ifr, 0, sizeof(ifr));
577 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
578 if (dev->flags & DEV_OPT_MTU) {
579 ifr.ifr_mtu = dev->mtu;
580 ioctl(sock_ioctl, SIOCSIFMTU, &ifr);
582 if (dev->flags & DEV_OPT_TXQUEUELEN) {
583 ifr.ifr_qlen = dev->txqueuelen;
584 ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr);
586 if (dev->flags & DEV_OPT_MACADDR) {
587 memcpy(&ifr.ifr_hwaddr, dev->macaddr, sizeof(dev->macaddr));
588 ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr);
591 dev->ifindex = system_if_resolve(dev);
594 int system_if_up(struct device *dev)
596 system_if_apply_settings(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);
642 int system_if_dump_stats(struct device *dev, struct blob_buf *b)
644 const char *const counters[] = {
645 "collisions", "rx_frame_errors", "tx_compressed",
646 "multicast", "rx_length_errors", "tx_dropped",
647 "rx_bytes", "rx_missed_errors", "tx_errors",
648 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
649 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
650 "rx_dropped", "tx_aborted_errors", "tx_packets",
651 "rx_errors", "tx_bytes", "tx_window_errors",
652 "rx_fifo_errors", "tx_carrier_errors",
658 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
659 stats_dir = open(buf, O_DIRECTORY);
663 for (i = 0; i < ARRAY_SIZE(counters); i++) {
664 fd = openat(stats_dir, counters[i], O_RDONLY);
669 len = read(fd, buf, sizeof(buf));
677 blobmsg_add_u32(b, counters[i], strtoul(buf, NULL, 0));
685 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
687 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
688 struct ifaddrmsg ifa = {
689 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
690 .ifa_prefixlen = addr->mask,
691 .ifa_index = dev->ifindex,
701 ifa.ifa_index = dev->ifindex;
704 msg = nlmsg_alloc_simple(cmd, 0);
708 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
709 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
710 return system_rtnl_call(msg);
713 int system_add_address(struct device *dev, struct device_addr *addr)
715 return system_addr(dev, addr, RTM_NEWADDR);
718 int system_del_address(struct device *dev, struct device_addr *addr)
720 return system_addr(dev, addr, RTM_DELADDR);
723 static int system_rt(struct device *dev, struct device_route *route, int cmd)
725 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
727 unsigned int flags = 0;
728 int ifindex = dev->ifindex;
731 have_gw = !!route->nexthop.in.s_addr;
733 have_gw = route->nexthop.in6.s6_addr32[0] ||
734 route->nexthop.in6.s6_addr32[1] ||
735 route->nexthop.in6.s6_addr32[2] ||
736 route->nexthop.in6.s6_addr32[3];
738 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
739 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
742 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
743 .rtm_dst_len = route->mask,
744 .rtm_table = RT_TABLE_MAIN,
745 .rtm_protocol = RTPROT_BOOT,
747 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
751 if (cmd == RTM_NEWROUTE)
752 flags |= NLM_F_CREATE | NLM_F_REPLACE;
759 ifindex = dev->ifindex;
762 msg = nlmsg_alloc_simple(cmd, flags);
766 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
769 nla_put(msg, RTA_DST, alen, &route->addr);
772 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
774 if (route->flags & DEVADDR_DEVICE)
775 nla_put_u32(msg, RTA_OIF, ifindex);
777 return system_rtnl_call(msg);
780 int system_add_route(struct device *dev, struct device_route *route)
782 return system_rt(dev, route, RTM_NEWROUTE);
785 int system_del_route(struct device *dev, struct device_route *route)
787 return system_rt(dev, route, RTM_DELROUTE);
790 int system_flush_routes(void)
792 const char *names[] = {
793 "/proc/sys/net/ipv4/route/flush",
794 "/proc/sys/net/ipv6/route/flush"
798 for (i = 0; i < ARRAY_SIZE(names); i++) {
799 fd = open(names[i], O_WRONLY);
809 time_t system_get_rtime(void)
814 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
817 if (gettimeofday(&tv, NULL) == 0)