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);
39 handler_nl_event(struct uloop_fd *u, unsigned int events)
41 struct event_socket *ev = container_of(u, struct event_socket, uloop);
42 nl_recvmsgs(ev->sock, ev->cb);
45 static struct nl_sock *
46 create_socket(int protocol)
50 sock = nl_socket_alloc();
54 if (nl_connect(sock, protocol))
61 create_event_socket(struct event_socket *ev, int protocol,
62 int (*cb)(struct nl_msg *msg, void *arg))
64 // Prepare socket for link events
65 ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
69 nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
71 ev->sock = create_socket(protocol);
75 ev->uloop.fd = nl_socket_get_fd(ev->sock);
76 ev->uloop.cb = handler_nl_event;
77 uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
83 static struct event_socket rtnl_event;
85 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
86 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
88 // Prepare socket for routing / address control
89 sock_rtnl = create_socket(NETLINK_ROUTE);
93 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
96 // Receive network link events form kernel
97 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
102 static void system_set_sysctl(const char *path, const char *val)
106 fd = open(path, O_WRONLY);
110 write(fd, val, strlen(val));
114 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
116 static char buf[256];
118 snprintf(buf, sizeof(buf), path, val);
119 system_set_sysctl(buf, val);
122 static void system_set_disable_ipv6(struct device *dev, const char *val)
124 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
127 // Evaluate netlink messages
128 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
130 struct nlmsghdr *nh = nlmsg_hdr(msg);
131 struct ifinfomsg *ifi = NLMSG_DATA(nh);
132 struct nlattr *nla[__IFLA_MAX];
134 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
137 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
138 if (!nla[IFLA_IFNAME])
141 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
145 dev->ifindex = ifi->ifi_index;
146 device_set_present(dev, (nh->nlmsg_type == RTM_NEWLINK));
152 static int system_rtnl_call(struct nl_msg *msg)
154 int s = -(nl_send_auto_complete(sock_rtnl, msg)
155 || nl_wait_for_ack(sock_rtnl));
160 int system_bridge_delbr(struct device *bridge)
162 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
165 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
169 ifr.ifr_ifindex = dev->ifindex;
172 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
173 return ioctl(sock_ioctl, cmd, &ifr);
176 int system_bridge_addif(struct device *bridge, struct device *dev)
178 system_set_disable_ipv6(dev, "1");
179 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
182 int system_bridge_delif(struct device *bridge, struct device *dev)
184 system_set_disable_ipv6(dev, "0");
185 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
188 static bool system_is_bridge(const char *name, char *buf, int buflen)
192 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
193 if (stat(buf, &st) < 0)
199 static char *system_get_bridge(const char *name, char *buf, int buflen)
205 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
206 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
209 if (gl.gl_pathc == 0)
212 len = readlink(gl.gl_pathv[0], buf, buflen);
217 path = strrchr(buf, '/');
224 static int system_if_resolve(struct device *dev)
227 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
228 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
229 return ifr.ifr_ifindex;
234 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
237 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
238 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
239 ifr.ifr_flags |= add;
240 ifr.ifr_flags &= ~rem;
241 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
253 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
255 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
257 return ifa->ifa_index == ifindex;
260 static bool check_route(struct nlmsghdr *hdr, int ifindex)
262 struct nlattr *tb[__RTA_MAX];
264 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
268 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
271 static int cb_clear_event(struct nl_msg *msg, void *arg)
273 struct clear_data *clr = arg;
274 struct nlmsghdr *hdr = nlmsg_hdr(msg);
275 bool (*cb)(struct nlmsghdr *, int ifindex);
281 if (hdr->nlmsg_type != RTM_NEWADDR)
288 if (hdr->nlmsg_type != RTM_NEWROUTE)
297 if (!cb(hdr, clr->dev->ifindex))
300 D(SYSTEM, "Remove %s from device %s\n",
301 type == RTM_DELADDR ? "an address" : "a route",
303 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
304 hdr = nlmsg_hdr(clr->msg);
305 hdr->nlmsg_type = type;
306 hdr->nlmsg_flags = NLM_F_REQUEST;
308 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
309 nl_wait_for_ack(sock_rtnl);
315 cb_finish_event(struct nl_msg *msg, void *arg)
323 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
326 *pending = err->error;
331 system_if_clear_entries(struct device *dev, int type, int af)
333 struct clear_data clr;
334 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
337 .rtm_flags = RTM_F_CLONED,
339 int flags = NLM_F_DUMP;
347 clr.size = sizeof(struct rtgenmsg);
350 clr.size = sizeof(struct rtmsg);
359 clr.msg = nlmsg_alloc_simple(type, flags);
363 nlmsg_append(clr.msg, &rtm, clr.size, 0);
364 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
365 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
366 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
368 nl_send_auto_complete(sock_rtnl, clr.msg);
370 nl_recvmsgs(sock_rtnl, cb);
378 * Clear bridge (membership) state and bring down device
380 void system_if_clear_state(struct device *dev)
382 static char buf[256];
388 dev->ifindex = system_if_resolve(dev);
392 system_if_flags(dev->ifname, 0, IFF_UP);
394 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
395 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
396 system_bridge_delbr(dev);
400 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
402 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
403 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
406 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
407 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
408 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
409 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
410 system_set_disable_ipv6(dev, "0");
413 static inline unsigned long
414 sec_to_jiffies(int val)
416 return (unsigned long) val * 100;
419 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
421 unsigned long args[4] = {};
423 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
426 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
427 args[1] = !!cfg->stp;
428 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
430 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
431 args[1] = sec_to_jiffies(cfg->forward_delay);
432 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
434 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
435 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
437 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
438 args[0] = BRCTL_SET_AGEING_TIME;
439 args[1] = sec_to_jiffies(cfg->ageing_time);
440 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
443 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
444 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
445 args[1] = sec_to_jiffies(cfg->hello_time);
446 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
449 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
450 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
451 args[1] = sec_to_jiffies(cfg->max_age);
452 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
458 static int system_vlan(struct device *dev, int id)
460 struct vlan_ioctl_args ifr = {
461 .cmd = SET_VLAN_NAME_TYPE_CMD,
462 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
465 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
468 ifr.cmd = DEL_VLAN_CMD;
471 ifr.cmd = ADD_VLAN_CMD;
474 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
475 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
478 int system_vlan_add(struct device *dev, int id)
480 return system_vlan(dev, id);
483 int system_vlan_del(struct device *dev)
485 return system_vlan(dev, -1);
489 system_if_apply_settings(struct device *dev)
493 memset(&ifr, 0, sizeof(ifr));
494 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
495 if (dev->flags & DEV_OPT_MTU) {
496 ifr.ifr_mtu = dev->mtu;
497 ioctl(sock_ioctl, SIOCSIFMTU, &ifr);
499 if (dev->flags & DEV_OPT_TXQUEUELEN) {
500 ifr.ifr_qlen = dev->txqueuelen;
501 ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr);
503 if (dev->flags & DEV_OPT_MACADDR) {
504 memcpy(&ifr.ifr_hwaddr, dev->macaddr, sizeof(dev->macaddr));
505 ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr);
508 dev->ifindex = system_if_resolve(dev);
511 int system_if_up(struct device *dev)
513 system_if_apply_settings(dev);
514 return system_if_flags(dev->ifname, IFF_UP, 0);
517 int system_if_down(struct device *dev)
519 return system_if_flags(dev->ifname, 0, IFF_UP);
522 int system_if_check(struct device *dev)
524 device_set_present(dev, (system_if_resolve(dev) >= 0));
528 int system_if_dump_stats(struct device *dev, struct blob_buf *b)
530 const char *const counters[] = {
531 "collisions", "rx_frame_errors", "tx_compressed",
532 "multicast", "rx_length_errors", "tx_dropped",
533 "rx_bytes", "rx_missed_errors", "tx_errors",
534 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
535 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
536 "rx_dropped", "tx_aborted_errors", "tx_packets",
537 "rx_errors", "tx_bytes", "tx_window_errors",
538 "rx_fifo_errors", "tx_carrier_errors",
544 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
545 stats_dir = open(buf, O_DIRECTORY);
549 for (i = 0; i < ARRAY_SIZE(counters); i++) {
550 fd = openat(stats_dir, counters[i], O_RDONLY);
555 len = read(fd, buf, sizeof(buf));
563 blobmsg_add_u32(b, counters[i], strtoul(buf, NULL, 0));
571 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
573 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
574 struct ifaddrmsg ifa = {
575 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
576 .ifa_prefixlen = addr->mask,
577 .ifa_index = dev->ifindex,
587 ifa.ifa_index = dev->ifindex;
590 msg = nlmsg_alloc_simple(cmd, 0);
594 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
595 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
596 return system_rtnl_call(msg);
599 int system_add_address(struct device *dev, struct device_addr *addr)
601 return system_addr(dev, addr, RTM_NEWADDR);
604 int system_del_address(struct device *dev, struct device_addr *addr)
606 return system_addr(dev, addr, RTM_DELADDR);
609 static int system_rt(struct device *dev, struct device_route *route, int cmd)
611 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
613 unsigned int flags = 0;
614 int ifindex = dev->ifindex;
617 have_gw = !!route->nexthop.in.s_addr;
619 have_gw = route->nexthop.in6.s6_addr32[0] ||
620 route->nexthop.in6.s6_addr32[1] ||
621 route->nexthop.in6.s6_addr32[2] ||
622 route->nexthop.in6.s6_addr32[3];
624 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
625 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
628 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
629 .rtm_dst_len = route->mask,
630 .rtm_table = RT_TABLE_MAIN,
631 .rtm_protocol = RTPROT_BOOT,
633 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
637 if (cmd == RTM_NEWROUTE)
638 flags |= NLM_F_CREATE | NLM_F_REPLACE;
645 ifindex = dev->ifindex;
648 msg = nlmsg_alloc_simple(cmd, flags);
652 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
655 nla_put(msg, RTA_DST, alen, &route->addr);
658 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
660 if (route->flags & DEVADDR_DEVICE)
661 nla_put_u32(msg, RTA_OIF, ifindex);
663 return system_rtnl_call(msg);
666 int system_add_route(struct device *dev, struct device_route *route)
668 return system_rt(dev, route, RTM_NEWROUTE);
671 int system_del_route(struct device *dev, struct device_route *route)
673 return system_rt(dev, route, RTM_DELROUTE);
676 int system_flush_routes(void)
678 const char *names[] = {
679 "/proc/sys/net/ipv4/route/flush",
680 "/proc/sys/net/ipv6/route/flush"
684 for (i = 0; i < ARRAY_SIZE(names); i++) {
685 fd = open(names[i], O_WRONLY);
695 time_t system_get_rtime(void)
700 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
703 if (gettimeofday(&tv, NULL) == 0)