1 #include <sys/socket.h>
5 #include <linux/rtnetlink.h>
6 #include <linux/sockios.h>
7 #include <linux/if_vlan.h>
8 #include <linux/if_bridge.h>
15 #include <netlink/msg.h>
16 #include <netlink/attr.h>
17 #include <netlink/socket.h>
18 #include <libubox/uloop.h>
24 static int sock_ioctl = -1;
25 static struct nl_sock *sock_rtnl = NULL;
26 static struct nl_sock *sock_rtnl_event = NULL;
28 static void handler_rtnl_event(struct uloop_fd *u, unsigned int events);
29 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
30 static struct uloop_fd rtnl_event = {.cb = handler_rtnl_event};
31 static struct nl_cb *nl_cb_rtnl_event;
35 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
36 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
38 // Prepare socket for routing / address control
39 sock_rtnl = nl_socket_alloc();
43 if (nl_connect(sock_rtnl, NETLINK_ROUTE))
46 // Prepare socket for link events
47 nl_cb_rtnl_event = nl_cb_alloc(NL_CB_DEFAULT);
48 if (!nl_cb_rtnl_event)
51 nl_cb_set(nl_cb_rtnl_event, NL_CB_VALID, NL_CB_CUSTOM,
54 sock_rtnl_event = nl_socket_alloc();
58 if (nl_connect(sock_rtnl_event, NETLINK_ROUTE))
59 goto error_free_event;
61 // Receive network link events form kernel
62 nl_socket_add_membership(sock_rtnl_event, RTNLGRP_LINK);
64 rtnl_event.fd = nl_socket_get_fd(sock_rtnl_event);
65 uloop_fd_add(&rtnl_event, ULOOP_READ | ULOOP_EDGE_TRIGGER);
70 nl_socket_free(sock_rtnl_event);
71 sock_rtnl_event = NULL;
73 nl_cb_put(nl_cb_rtnl_event);
74 nl_cb_rtnl_event = NULL;
76 nl_socket_free(sock_rtnl);
81 // If socket is ready for reading parse netlink events
82 static void handler_rtnl_event(struct uloop_fd *u, unsigned int events)
84 nl_recvmsgs(sock_rtnl_event, nl_cb_rtnl_event);
87 // Evaluate netlink messages
88 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
90 struct nlmsghdr *nh = nlmsg_hdr(msg);
91 struct ifinfomsg *ifi = NLMSG_DATA(nh);
92 struct nlattr *nla[__IFLA_MAX];
94 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
97 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
98 if (!nla[IFLA_IFNAME])
101 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
105 dev->ifindex = ifi->ifi_index;
106 device_set_present(dev, (nh->nlmsg_type == RTM_NEWLINK));
112 static int system_rtnl_call(struct nl_msg *msg)
114 int s = -(nl_send_auto_complete(sock_rtnl, msg)
115 || nl_wait_for_ack(sock_rtnl));
120 int system_bridge_delbr(struct device *bridge)
122 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
125 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
129 ifr.ifr_ifindex = dev->ifindex;
132 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
133 return ioctl(sock_ioctl, cmd, &ifr);
136 int system_bridge_addif(struct device *bridge, struct device *dev)
138 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
141 int system_bridge_delif(struct device *bridge, struct device *dev)
143 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
146 static bool system_is_bridge(const char *name, char *buf, int buflen)
150 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
151 if (stat(buf, &st) < 0)
157 static char *system_get_bridge(const char *name, char *buf, int buflen)
163 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
164 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
167 if (gl.gl_pathc == 0)
170 len = readlink(gl.gl_pathv[0], buf, buflen);
175 path = strrchr(buf, '/');
182 static int system_if_resolve(struct device *dev)
185 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
186 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
187 return ifr.ifr_ifindex;
192 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
195 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
196 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
197 ifr.ifr_flags |= add;
198 ifr.ifr_flags &= ~rem;
199 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
203 * Clear bridge (membership) state and bring down device
205 static void system_if_clear_state(struct device *dev)
210 dev->ifindex = system_if_resolve(dev);
214 system_if_flags(dev->ifname, 0, IFF_UP);
216 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
217 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
218 system_bridge_delbr(dev);
222 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
224 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
225 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
229 static inline unsigned long
230 sec_to_jiffies(int val)
232 return (unsigned long) val * 100;
235 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
237 unsigned long args[4] = {};
239 system_if_clear_state(bridge);
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 system_if_clear_state(dev);
295 return system_vlan(dev, id);
298 int system_vlan_del(struct device *dev)
300 return system_vlan(dev, -1);
303 int system_if_up(struct device *dev)
305 dev->ifindex = system_if_resolve(dev);
306 return system_if_flags(dev->ifname, IFF_UP, 0);
309 int system_if_down(struct device *dev)
311 return system_if_flags(dev->ifname, 0, IFF_UP);
314 int system_if_check(struct device *dev)
316 system_if_clear_state(dev);
317 device_set_present(dev, (system_if_resolve(dev) >= 0));
321 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
323 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
324 struct ifaddrmsg ifa = {
325 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
326 .ifa_prefixlen = addr->mask,
327 .ifa_index = dev->ifindex,
330 struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0);
334 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
335 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
336 return system_rtnl_call(msg);
339 int system_add_address(struct device *dev, struct device_addr *addr)
341 return system_addr(dev, addr, RTM_NEWADDR);
344 int system_del_address(struct device *dev, struct device_addr *addr)
346 return system_addr(dev, addr, RTM_DELADDR);
349 static int system_rt(struct device *dev, struct device_route *route, int cmd)
351 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
355 have_gw = !!route->nexthop.in.s_addr;
357 have_gw = route->nexthop.in6.s6_addr32[0] ||
358 route->nexthop.in6.s6_addr32[1] ||
359 route->nexthop.in6.s6_addr32[2] ||
360 route->nexthop.in6.s6_addr32[3];
362 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
363 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
366 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
367 .rtm_dst_len = route->mask,
368 .rtm_table = RT_TABLE_MAIN,
369 .rtm_protocol = RTPROT_BOOT,
371 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
374 struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0);
378 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
381 nla_put(msg, RTA_DST, alen, &route->addr);
384 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
386 if (route->flags & DEVADDR_DEVICE)
387 nla_put_u32(msg, RTA_OIF, dev->ifindex);
389 return system_rtnl_call(msg);
392 int system_add_route(struct device *dev, struct device_route *route)
394 return system_rt(dev, route, RTM_NEWROUTE);
397 int system_del_route(struct device *dev, struct device_route *route)
399 return system_rt(dev, route, RTM_DELROUTE);