1 #include <sys/socket.h>
4 #include <sys/syscall.h>
6 #include <linux/rtnetlink.h>
7 #include <linux/sockios.h>
8 #include <linux/if_vlan.h>
9 #include <linux/if_bridge.h>
16 #include <netlink/msg.h>
17 #include <netlink/attr.h>
18 #include <netlink/socket.h>
19 #include <libubox/uloop.h>
25 static int sock_ioctl = -1;
26 static struct nl_sock *sock_rtnl = NULL;
27 static struct nl_sock *sock_rtnl_event = NULL;
29 static void handler_rtnl_event(struct uloop_fd *u, unsigned int events);
30 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
31 static struct uloop_fd rtnl_event = {.cb = handler_rtnl_event};
32 static struct nl_cb *nl_cb_rtnl_event;
36 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
37 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
39 // Prepare socket for routing / address control
40 sock_rtnl = nl_socket_alloc();
44 if (nl_connect(sock_rtnl, NETLINK_ROUTE))
47 // Prepare socket for link events
48 nl_cb_rtnl_event = nl_cb_alloc(NL_CB_DEFAULT);
49 if (!nl_cb_rtnl_event)
52 nl_cb_set(nl_cb_rtnl_event, NL_CB_VALID, NL_CB_CUSTOM,
55 sock_rtnl_event = nl_socket_alloc();
59 if (nl_connect(sock_rtnl_event, NETLINK_ROUTE))
60 goto error_free_event;
62 // Receive network link events form kernel
63 nl_socket_add_membership(sock_rtnl_event, RTNLGRP_LINK);
65 rtnl_event.fd = nl_socket_get_fd(sock_rtnl_event);
66 uloop_fd_add(&rtnl_event, ULOOP_READ | ULOOP_EDGE_TRIGGER);
71 nl_socket_free(sock_rtnl_event);
72 sock_rtnl_event = NULL;
74 nl_cb_put(nl_cb_rtnl_event);
75 nl_cb_rtnl_event = NULL;
77 nl_socket_free(sock_rtnl);
82 // If socket is ready for reading parse netlink events
83 static void handler_rtnl_event(struct uloop_fd *u, unsigned int events)
85 nl_recvmsgs(sock_rtnl_event, nl_cb_rtnl_event);
88 // Evaluate netlink messages
89 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
91 struct nlmsghdr *nh = nlmsg_hdr(msg);
92 struct ifinfomsg *ifi = NLMSG_DATA(nh);
93 struct nlattr *nla[__IFLA_MAX];
95 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
98 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
99 if (!nla[IFLA_IFNAME])
102 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
106 dev->ifindex = ifi->ifi_index;
107 device_set_present(dev, (nh->nlmsg_type == RTM_NEWLINK));
113 static int system_rtnl_call(struct nl_msg *msg)
115 int s = -(nl_send_auto_complete(sock_rtnl, msg)
116 || nl_wait_for_ack(sock_rtnl));
121 int system_bridge_delbr(struct device *bridge)
123 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
126 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
130 ifr.ifr_ifindex = dev->ifindex;
133 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
134 return ioctl(sock_ioctl, cmd, &ifr);
137 int system_bridge_addif(struct device *bridge, struct device *dev)
139 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
142 int system_bridge_delif(struct device *bridge, struct device *dev)
144 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
147 static bool system_is_bridge(const char *name, char *buf, int buflen)
151 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
152 if (stat(buf, &st) < 0)
158 static char *system_get_bridge(const char *name, char *buf, int buflen)
164 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
165 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
168 if (gl.gl_pathc == 0)
171 len = readlink(gl.gl_pathv[0], buf, buflen);
176 path = strrchr(buf, '/');
183 static int system_if_resolve(struct device *dev)
186 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
187 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
188 return ifr.ifr_ifindex;
193 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
196 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
197 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
198 ifr.ifr_flags |= add;
199 ifr.ifr_flags &= ~rem;
200 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
204 * Clear bridge (membership) state and bring down device
206 void system_if_clear_state(struct device *dev)
211 dev->ifindex = system_if_resolve(dev);
215 system_if_flags(dev->ifname, 0, IFF_UP);
217 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
218 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
219 system_bridge_delbr(dev);
223 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
225 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
226 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
230 static inline unsigned long
231 sec_to_jiffies(int val)
233 return (unsigned long) val * 100;
236 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
238 unsigned long args[4] = {};
240 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
243 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
244 args[1] = !!cfg->stp;
245 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
247 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
248 args[1] = sec_to_jiffies(cfg->forward_delay);
249 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
251 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
252 args[0] = BRCTL_SET_AGEING_TIME;
253 args[1] = sec_to_jiffies(cfg->ageing_time);
254 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
257 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
258 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
259 args[1] = sec_to_jiffies(cfg->hello_time);
260 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
263 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
264 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
265 args[1] = sec_to_jiffies(cfg->max_age);
266 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
272 static int system_vlan(struct device *dev, int id)
274 struct vlan_ioctl_args ifr = {
275 .cmd = SET_VLAN_NAME_TYPE_CMD,
276 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
279 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
282 ifr.cmd = DEL_VLAN_CMD;
285 ifr.cmd = ADD_VLAN_CMD;
288 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
289 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
292 int system_vlan_add(struct device *dev, int id)
294 return system_vlan(dev, id);
297 int system_vlan_del(struct device *dev)
299 return system_vlan(dev, -1);
302 int system_if_up(struct device *dev)
304 dev->ifindex = system_if_resolve(dev);
305 return system_if_flags(dev->ifname, IFF_UP, 0);
308 int system_if_down(struct device *dev)
310 return system_if_flags(dev->ifname, 0, IFF_UP);
313 int system_if_check(struct device *dev)
315 device_set_present(dev, (system_if_resolve(dev) >= 0));
319 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
321 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
322 struct ifaddrmsg ifa = {
323 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
324 .ifa_prefixlen = addr->mask,
325 .ifa_index = dev->ifindex,
328 struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0);
332 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
333 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
334 return system_rtnl_call(msg);
337 int system_add_address(struct device *dev, struct device_addr *addr)
339 return system_addr(dev, addr, RTM_NEWADDR);
342 int system_del_address(struct device *dev, struct device_addr *addr)
344 return system_addr(dev, addr, RTM_DELADDR);
347 static int system_rt(struct device *dev, struct device_route *route, int cmd)
349 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
353 have_gw = !!route->nexthop.in.s_addr;
355 have_gw = route->nexthop.in6.s6_addr32[0] ||
356 route->nexthop.in6.s6_addr32[1] ||
357 route->nexthop.in6.s6_addr32[2] ||
358 route->nexthop.in6.s6_addr32[3];
360 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
361 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
364 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
365 .rtm_dst_len = route->mask,
366 .rtm_table = RT_TABLE_MAIN,
367 .rtm_protocol = RTPROT_BOOT,
369 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
372 struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0);
376 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
379 nla_put(msg, RTA_DST, alen, &route->addr);
382 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
384 if (route->flags & DEVADDR_DEVICE)
385 nla_put_u32(msg, RTA_OIF, dev->ifindex);
387 return system_rtnl_call(msg);
390 int system_add_route(struct device *dev, struct device_route *route)
392 return system_rt(dev, route, RTM_NEWROUTE);
395 int system_del_route(struct device *dev, struct device_route *route)
397 return system_rt(dev, route, RTM_DELROUTE);
400 time_t system_get_rtime(void)
405 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
408 if (gettimeofday(&tv, NULL) == 0)