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 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 if (ioctl(sock_ioctl
, SIOCBRADDBR
, bridge
->ifname
) < 0)
242 args
[0] = BRCTL_SET_BRIDGE_STP_STATE
;
243 args
[1] = !!cfg
->stp
;
244 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
246 args
[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY
;
247 args
[1] = sec_to_jiffies(cfg
->forward_delay
);
248 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
250 if (cfg
->flags
& BRIDGE_OPT_AGEING_TIME
) {
251 args
[0] = BRCTL_SET_AGEING_TIME
;
252 args
[1] = sec_to_jiffies(cfg
->ageing_time
);
253 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
256 if (cfg
->flags
& BRIDGE_OPT_HELLO_TIME
) {
257 args
[0] = BRCTL_SET_BRIDGE_HELLO_TIME
;
258 args
[1] = sec_to_jiffies(cfg
->hello_time
);
259 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
262 if (cfg
->flags
& BRIDGE_OPT_MAX_AGE
) {
263 args
[0] = BRCTL_SET_BRIDGE_MAX_AGE
;
264 args
[1] = sec_to_jiffies(cfg
->max_age
);
265 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
271 static int system_vlan(struct device
*dev
, int id
)
273 struct vlan_ioctl_args ifr
= {
274 .cmd
= SET_VLAN_NAME_TYPE_CMD
,
275 .u
.name_type
= VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
,
278 ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
281 ifr
.cmd
= DEL_VLAN_CMD
;
284 ifr
.cmd
= ADD_VLAN_CMD
;
287 strncpy(ifr
.device1
, dev
->ifname
, sizeof(ifr
.device1
));
288 return ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
291 int system_vlan_add(struct device
*dev
, int id
)
293 return system_vlan(dev
, id
);
296 int system_vlan_del(struct device
*dev
)
298 return system_vlan(dev
, -1);
301 int system_if_up(struct device
*dev
)
303 dev
->ifindex
= system_if_resolve(dev
);
304 return system_if_flags(dev
->ifname
, IFF_UP
, 0);
307 int system_if_down(struct device
*dev
)
309 return system_if_flags(dev
->ifname
, 0, IFF_UP
);
312 int system_if_check(struct device
*dev
)
314 device_set_present(dev
, (system_if_resolve(dev
) >= 0));
318 static int system_addr(struct device
*dev
, struct device_addr
*addr
, int cmd
)
320 int alen
= ((addr
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
321 struct ifaddrmsg ifa
= {
322 .ifa_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
323 .ifa_prefixlen
= addr
->mask
,
324 .ifa_index
= dev
->ifindex
,
327 struct nl_msg
*msg
= nlmsg_alloc_simple(cmd
, 0);
331 nlmsg_append(msg
, &ifa
, sizeof(ifa
), 0);
332 nla_put(msg
, IFA_LOCAL
, alen
, &addr
->addr
);
333 return system_rtnl_call(msg
);
336 int system_add_address(struct device
*dev
, struct device_addr
*addr
)
338 return system_addr(dev
, addr
, RTM_NEWADDR
);
341 int system_del_address(struct device
*dev
, struct device_addr
*addr
)
343 return system_addr(dev
, addr
, RTM_DELADDR
);
346 static int system_rt(struct device
*dev
, struct device_route
*route
, int cmd
)
348 int alen
= ((route
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
352 have_gw
= !!route
->nexthop
.in
.s_addr
;
354 have_gw
= route
->nexthop
.in6
.s6_addr32
[0] ||
355 route
->nexthop
.in6
.s6_addr32
[1] ||
356 route
->nexthop
.in6
.s6_addr32
[2] ||
357 route
->nexthop
.in6
.s6_addr32
[3];
359 unsigned char scope
= (cmd
== RTM_DELROUTE
) ? RT_SCOPE_NOWHERE
:
360 (have_gw
) ? RT_SCOPE_UNIVERSE
: RT_SCOPE_LINK
;
363 .rtm_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
364 .rtm_dst_len
= route
->mask
,
365 .rtm_table
= RT_TABLE_MAIN
,
366 .rtm_protocol
= RTPROT_BOOT
,
368 .rtm_type
= (cmd
== RTM_DELROUTE
) ? 0: RTN_UNICAST
,
371 struct nl_msg
*msg
= nlmsg_alloc_simple(cmd
, 0);
375 nlmsg_append(msg
, &rtm
, sizeof(rtm
), 0);
378 nla_put(msg
, RTA_DST
, alen
, &route
->addr
);
381 nla_put(msg
, RTA_GATEWAY
, alen
, &route
->nexthop
);
383 if (route
->flags
& DEVADDR_DEVICE
)
384 nla_put_u32(msg
, RTA_OIF
, dev
->ifindex
);
386 return system_rtnl_call(msg
);
389 int system_add_route(struct device
*dev
, struct device_route
*route
)
391 return system_rt(dev
, route
, RTM_NEWROUTE
);
394 int system_del_route(struct device
*dev
, struct device_route
*route
)
396 return system_rt(dev
, route
, RTM_DELROUTE
);