1 #include <sys/socket.h>
4 #include <linux/rtnetlink.h>
5 #include <linux/sockios.h>
6 #include <linux/if_vlan.h>
11 #include <netlink/msg.h>
12 #include <netlink/attr.h>
13 #include <netlink/socket.h>
14 #include <libubox/uloop.h>
20 static int sock_ioctl = -1;
21 static struct nl_sock *sock_rtnl = NULL;
22 static struct nl_sock *sock_rtnl_event = NULL;
24 static void handler_rtnl_event(struct uloop_fd *u, unsigned int events);
25 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
26 static struct uloop_fd rtnl_event = {.cb = handler_rtnl_event};
27 static struct nl_cb *nl_cb_rtnl_event;
31 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
32 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
34 // Prepare socket for routing / address control
35 if ((sock_rtnl = nl_socket_alloc())) {
36 if (nl_connect(sock_rtnl, NETLINK_ROUTE)) {
37 nl_socket_free(sock_rtnl);
42 // Prepare socket for link events
43 if ((nl_cb_rtnl_event = nl_cb_alloc(NL_CB_DEFAULT)))
44 nl_cb_set(nl_cb_rtnl_event, NL_CB_VALID, NL_CB_CUSTOM,
47 if (nl_cb_rtnl_event && (sock_rtnl_event = nl_socket_alloc())) {
48 if (nl_connect(sock_rtnl_event, NETLINK_ROUTE)) {
49 nl_socket_free(sock_rtnl_event);
50 sock_rtnl_event = NULL;
52 // Receive network link events form kernel
53 nl_socket_add_membership(sock_rtnl_event, RTNLGRP_LINK);
55 // Synthesize initial link messages
56 struct nl_msg *m = nlmsg_alloc_simple(RTM_GETLINK, NLM_F_DUMP);
57 if (m && nlmsg_reserve(m, sizeof(struct ifinfomsg), 0)) {
58 nl_send_auto_complete(sock_rtnl_event, m);
62 rtnl_event.fd = nl_socket_get_fd(sock_rtnl_event);
63 uloop_fd_add(&rtnl_event, ULOOP_READ | ULOOP_EDGE_TRIGGER);
66 return -(sock_ioctl < 0 || !sock_rtnl);
69 // If socket is ready for reading parse netlink events
70 static void handler_rtnl_event(struct uloop_fd *u, unsigned int events)
72 nl_recvmsgs(sock_rtnl_event, nl_cb_rtnl_event);
75 // Evaluate netlink messages
76 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
78 struct nlmsghdr *nh = nlmsg_hdr(msg);
79 struct ifinfomsg *ifi = NLMSG_DATA(nh);
80 struct nlattr *nla[__IFLA_MAX];
82 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
85 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
86 if (!nla[IFLA_IFNAME])
89 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
93 dev->ifindex = ifi->ifi_index;
94 device_set_present(dev, (nh->nlmsg_type == RTM_NEWLINK));
100 static int system_rtnl_call(struct nl_msg *msg)
102 int s = -(nl_send_auto_complete(sock_rtnl, msg)
103 || nl_wait_for_ack(sock_rtnl));
108 int system_bridge_addbr(struct device *bridge)
110 return ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname);
113 int system_bridge_delbr(struct device *bridge)
115 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
118 static int system_bridge_if(struct device *bridge, struct device *dev, int cmd)
121 ifr.ifr_ifindex = dev->ifindex;
122 strncpy(ifr.ifr_name, bridge->ifname, sizeof(ifr.ifr_name));
123 return ioctl(sock_ioctl, cmd, &ifr);
126 int system_bridge_addif(struct device *bridge, struct device *dev)
128 return system_bridge_if(bridge, dev, SIOCBRADDIF);
131 int system_bridge_delif(struct device *bridge, struct device *dev)
133 return system_bridge_if(bridge, dev, SIOCBRDELIF);
136 static int system_vlan(struct device *dev, int id)
138 struct vlan_ioctl_args ifr = {
139 .cmd = (id == 0) ? DEL_VLAN_CMD : ADD_VLAN_CMD,
142 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
143 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
146 int system_vlan_add(struct device *dev, int id)
148 return system_vlan(dev, id);
151 int system_vlan_del(struct device *dev)
153 return system_vlan(dev, 0);
156 static int system_if_flags(struct device *dev, unsigned add, unsigned rem)
159 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
160 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
161 ifr.ifr_flags |= add;
162 ifr.ifr_flags &= ~rem;
163 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
166 static int system_if_resolve(struct device *dev)
169 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
170 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
171 return ifr.ifr_ifindex;
176 int system_if_up(struct device *dev)
178 dev->ifindex = system_if_resolve(dev);
179 return system_if_flags(dev, IFF_UP, 0);
182 int system_if_down(struct device *dev)
184 return system_if_flags(dev, 0, IFF_UP);
187 int system_if_check(struct device *dev)
189 device_set_present(dev, (system_if_resolve(dev) >= 0));
193 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
195 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
196 struct ifaddrmsg ifa = {
197 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
198 .ifa_prefixlen = addr->mask,
199 .ifa_index = dev->ifindex,
202 struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0);
206 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
207 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
208 return system_rtnl_call(msg);
211 int system_add_address(struct device *dev, struct device_addr *addr)
213 return system_addr(dev, addr, RTM_NEWADDR);
216 int system_del_address(struct device *dev, struct device_addr *addr)
218 return system_addr(dev, addr, RTM_DELADDR);
221 static int system_rt(struct device *dev, struct device_route *route, int cmd)
223 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
227 have_gw = !!route->nexthop.in.s_addr;
229 have_gw = route->nexthop.in6.s6_addr32[0] ||
230 route->nexthop.in6.s6_addr32[1] ||
231 route->nexthop.in6.s6_addr32[2] ||
232 route->nexthop.in6.s6_addr32[3];
234 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
235 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
238 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
239 .rtm_dst_len = route->mask,
240 .rtm_table = RT_TABLE_MAIN,
241 .rtm_protocol = RTPROT_BOOT,
243 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
246 struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0);
250 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
253 nla_put(msg, RTA_DST, alen, &route->addr);
256 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
258 if (route->flags & DEVADDR_DEVICE)
259 nla_put_u32(msg, RTA_OIF, dev->ifindex);
261 return system_rtnl_call(msg);
264 int system_add_route(struct device *dev, struct device_route *route)
266 return system_rt(dev, route, RTM_NEWROUTE);
269 int system_del_route(struct device *dev, struct device_route *route)
271 return system_rt(dev, route, RTM_DELROUTE);