1 #include <sys/socket.h>
5 #include <linux/rtnetlink.h>
6 #include <linux/sockios.h>
7 #include <linux/if_vlan.h>
14 #include <netlink/msg.h>
15 #include <netlink/attr.h>
16 #include <netlink/socket.h>
17 #include <libubox/uloop.h>
23 static int sock_ioctl
= -1;
24 static struct nl_sock
*sock_rtnl
= NULL
;
25 static struct nl_sock
*sock_rtnl_event
= NULL
;
27 static void handler_rtnl_event(struct uloop_fd
*u
, unsigned int events
);
28 static int cb_rtnl_event(struct nl_msg
*msg
, void *arg
);
29 static struct uloop_fd rtnl_event
= {.cb
= handler_rtnl_event
};
30 static struct nl_cb
*nl_cb_rtnl_event
;
34 sock_ioctl
= socket(AF_LOCAL
, SOCK_DGRAM
, 0);
35 fcntl(sock_ioctl
, F_SETFD
, fcntl(sock_ioctl
, F_GETFD
) | FD_CLOEXEC
);
37 // Prepare socket for routing / address control
38 sock_rtnl
= nl_socket_alloc();
42 if (nl_connect(sock_rtnl
, NETLINK_ROUTE
))
45 // Prepare socket for link events
46 nl_cb_rtnl_event
= nl_cb_alloc(NL_CB_DEFAULT
);
47 if (!nl_cb_rtnl_event
)
50 nl_cb_set(nl_cb_rtnl_event
, NL_CB_VALID
, NL_CB_CUSTOM
,
53 sock_rtnl_event
= nl_socket_alloc();
57 if (nl_connect(sock_rtnl_event
, NETLINK_ROUTE
))
58 goto error_free_event
;
60 // Receive network link events form kernel
61 nl_socket_add_membership(sock_rtnl_event
, RTNLGRP_LINK
);
63 rtnl_event
.fd
= nl_socket_get_fd(sock_rtnl_event
);
64 uloop_fd_add(&rtnl_event
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
69 nl_socket_free(sock_rtnl_event
);
70 sock_rtnl_event
= NULL
;
72 nl_cb_put(nl_cb_rtnl_event
);
73 nl_cb_rtnl_event
= NULL
;
75 nl_socket_free(sock_rtnl
);
80 // If socket is ready for reading parse netlink events
81 static void handler_rtnl_event(struct uloop_fd
*u
, unsigned int events
)
83 nl_recvmsgs(sock_rtnl_event
, nl_cb_rtnl_event
);
86 // Evaluate netlink messages
87 static int cb_rtnl_event(struct nl_msg
*msg
, void *arg
)
89 struct nlmsghdr
*nh
= nlmsg_hdr(msg
);
90 struct ifinfomsg
*ifi
= NLMSG_DATA(nh
);
91 struct nlattr
*nla
[__IFLA_MAX
];
93 if (nh
->nlmsg_type
!= RTM_DELLINK
&& nh
->nlmsg_type
!= RTM_NEWLINK
)
96 nlmsg_parse(nh
, sizeof(*ifi
), nla
, __IFLA_MAX
- 1, NULL
);
97 if (!nla
[IFLA_IFNAME
])
100 struct device
*dev
= device_get(RTA_DATA(nla
[IFLA_IFNAME
]), false);
104 dev
->ifindex
= ifi
->ifi_index
;
105 device_set_present(dev
, (nh
->nlmsg_type
== RTM_NEWLINK
));
111 static int system_rtnl_call(struct nl_msg
*msg
)
113 int s
= -(nl_send_auto_complete(sock_rtnl
, msg
)
114 || nl_wait_for_ack(sock_rtnl
));
119 int system_bridge_delbr(struct device
*bridge
)
121 return ioctl(sock_ioctl
, SIOCBRDELBR
, bridge
->ifname
);
124 static int system_bridge_if(const char *bridge
, struct device
*dev
, int cmd
)
127 ifr
.ifr_ifindex
= dev
->ifindex
;
128 strncpy(ifr
.ifr_name
, bridge
, sizeof(ifr
.ifr_name
));
129 return ioctl(sock_ioctl
, cmd
, &ifr
);
132 int system_bridge_addif(struct device
*bridge
, struct device
*dev
)
134 return system_bridge_if(bridge
->ifname
, dev
, SIOCBRADDIF
);
137 int system_bridge_delif(struct device
*bridge
, struct device
*dev
)
139 return system_bridge_if(bridge
->ifname
, dev
, SIOCBRDELIF
);
142 static bool system_is_bridge(const char *name
, char *buf
, int buflen
)
146 snprintf(buf
, buflen
, "/sys/devices/virtual/net/%s/bridge", name
);
147 if (stat(buf
, &st
) < 0)
153 static char *system_get_bridge(const char *name
, char *buf
, int buflen
)
159 snprintf(buf
, buflen
, "/sys/devices/virtual/net/*/brif/%s/bridge", name
);
160 if (glob(buf
, GLOB_NOSORT
, NULL
, &gl
) < 0)
163 if (gl
.gl_pathc
== 0)
166 len
= readlink(gl
.gl_pathv
[0], buf
, buflen
);
171 path
= strrchr(buf
, '/');
178 static int system_if_resolve(struct device
*dev
)
181 strncpy(ifr
.ifr_name
, dev
->ifname
, sizeof(ifr
.ifr_name
));
182 if (!ioctl(sock_ioctl
, SIOCGIFINDEX
, &ifr
))
183 return ifr
.ifr_ifindex
;
188 static int system_if_flags(const char *ifname
, unsigned add
, unsigned rem
)
191 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
192 ioctl(sock_ioctl
, SIOCGIFFLAGS
, &ifr
);
193 ifr
.ifr_flags
|= add
;
194 ifr
.ifr_flags
&= ~rem
;
195 return ioctl(sock_ioctl
, SIOCSIFFLAGS
, &ifr
);
199 * Clear bridge (membership) state and bring down device
201 static void system_if_clear_state(struct device
*dev
)
206 dev
->ifindex
= system_if_resolve(dev
);
210 system_if_flags(dev
->ifname
, 0, IFF_UP
);
212 if (system_is_bridge(dev
->ifname
, buf
, sizeof(buf
))) {
213 D(SYSTEM
, "Delete existing bridge named '%s'\n", dev
->ifname
);
214 system_bridge_delbr(dev
);
218 bridge
= system_get_bridge(dev
->ifname
, buf
, sizeof(buf
));
220 D(SYSTEM
, "Remove device '%s' from bridge '%s'\n", dev
->ifname
, bridge
);
221 system_bridge_if(bridge
, dev
, SIOCBRDELIF
);
225 int system_bridge_addbr(struct device
*bridge
)
227 system_if_clear_state(bridge
);
228 return ioctl(sock_ioctl
, SIOCBRADDBR
, bridge
->ifname
);
231 static int system_vlan(struct device
*dev
, int id
)
233 struct vlan_ioctl_args ifr
= {
234 .cmd
= SET_VLAN_NAME_TYPE_CMD
,
235 .u
.name_type
= VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
,
238 ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
241 ifr
.cmd
= DEL_VLAN_CMD
;
244 ifr
.cmd
= ADD_VLAN_CMD
;
247 strncpy(ifr
.device1
, dev
->ifname
, sizeof(ifr
.device1
));
248 return ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
251 int system_vlan_add(struct device
*dev
, int id
)
253 system_if_clear_state(dev
);
254 return system_vlan(dev
, id
);
257 int system_vlan_del(struct device
*dev
)
259 return system_vlan(dev
, -1);
262 int system_if_up(struct device
*dev
)
264 dev
->ifindex
= system_if_resolve(dev
);
265 return system_if_flags(dev
->ifname
, IFF_UP
, 0);
268 int system_if_down(struct device
*dev
)
270 return system_if_flags(dev
->ifname
, 0, IFF_UP
);
273 int system_if_check(struct device
*dev
)
275 system_if_clear_state(dev
);
276 device_set_present(dev
, (system_if_resolve(dev
) >= 0));
280 static int system_addr(struct device
*dev
, struct device_addr
*addr
, int cmd
)
282 int alen
= ((addr
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
283 struct ifaddrmsg ifa
= {
284 .ifa_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
285 .ifa_prefixlen
= addr
->mask
,
286 .ifa_index
= dev
->ifindex
,
289 struct nl_msg
*msg
= nlmsg_alloc_simple(cmd
, 0);
293 nlmsg_append(msg
, &ifa
, sizeof(ifa
), 0);
294 nla_put(msg
, IFA_LOCAL
, alen
, &addr
->addr
);
295 return system_rtnl_call(msg
);
298 int system_add_address(struct device
*dev
, struct device_addr
*addr
)
300 return system_addr(dev
, addr
, RTM_NEWADDR
);
303 int system_del_address(struct device
*dev
, struct device_addr
*addr
)
305 return system_addr(dev
, addr
, RTM_DELADDR
);
308 static int system_rt(struct device
*dev
, struct device_route
*route
, int cmd
)
310 int alen
= ((route
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
314 have_gw
= !!route
->nexthop
.in
.s_addr
;
316 have_gw
= route
->nexthop
.in6
.s6_addr32
[0] ||
317 route
->nexthop
.in6
.s6_addr32
[1] ||
318 route
->nexthop
.in6
.s6_addr32
[2] ||
319 route
->nexthop
.in6
.s6_addr32
[3];
321 unsigned char scope
= (cmd
== RTM_DELROUTE
) ? RT_SCOPE_NOWHERE
:
322 (have_gw
) ? RT_SCOPE_UNIVERSE
: RT_SCOPE_LINK
;
325 .rtm_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
326 .rtm_dst_len
= route
->mask
,
327 .rtm_table
= RT_TABLE_MAIN
,
328 .rtm_protocol
= RTPROT_BOOT
,
330 .rtm_type
= (cmd
== RTM_DELROUTE
) ? 0: RTN_UNICAST
,
333 struct nl_msg
*msg
= nlmsg_alloc_simple(cmd
, 0);
337 nlmsg_append(msg
, &rtm
, sizeof(rtm
), 0);
340 nla_put(msg
, RTA_DST
, alen
, &route
->addr
);
343 nla_put(msg
, RTA_GATEWAY
, alen
, &route
->nexthop
);
345 if (route
->flags
& DEVADDR_DEVICE
)
346 nla_put_u32(msg
, RTA_OIF
, dev
->ifindex
);
348 return system_rtnl_call(msg
);
351 int system_add_route(struct device
*dev
, struct device_route
*route
)
353 return system_rt(dev
, route
, RTM_NEWROUTE
);
356 int system_del_route(struct device
*dev
, struct device_route
*route
)
358 return system_rt(dev
, route
, RTM_DELROUTE
);