3 #include <sys/socket.h>
6 #include <sys/syscall.h>
8 #include <linux/rtnetlink.h>
9 #include <linux/sockios.h>
10 #include <linux/if_vlan.h>
11 #include <linux/if_bridge.h>
18 #include <netlink/msg.h>
19 #include <netlink/attr.h>
20 #include <netlink/socket.h>
21 #include <libubox/uloop.h>
27 static int sock_ioctl
= -1;
28 static struct nl_sock
*sock_rtnl
= NULL
;
29 static struct nl_sock
*sock_rtnl_event
= NULL
;
31 static void handler_rtnl_event(struct uloop_fd
*u
, unsigned int events
);
32 static int cb_rtnl_event(struct nl_msg
*msg
, void *arg
);
33 static struct uloop_fd rtnl_event
= {.cb
= handler_rtnl_event
};
34 static struct nl_cb
*nl_cb_rtnl_event
;
38 sock_ioctl
= socket(AF_LOCAL
, SOCK_DGRAM
, 0);
39 fcntl(sock_ioctl
, F_SETFD
, fcntl(sock_ioctl
, F_GETFD
) | FD_CLOEXEC
);
41 // Prepare socket for routing / address control
42 sock_rtnl
= nl_socket_alloc();
46 if (nl_connect(sock_rtnl
, NETLINK_ROUTE
))
49 // Prepare socket for link events
50 nl_cb_rtnl_event
= nl_cb_alloc(NL_CB_DEFAULT
);
51 if (!nl_cb_rtnl_event
)
54 nl_cb_set(nl_cb_rtnl_event
, NL_CB_VALID
, NL_CB_CUSTOM
,
57 sock_rtnl_event
= nl_socket_alloc();
61 if (nl_connect(sock_rtnl_event
, NETLINK_ROUTE
))
62 goto error_free_event
;
64 // Receive network link events form kernel
65 nl_socket_add_membership(sock_rtnl_event
, RTNLGRP_LINK
);
67 rtnl_event
.fd
= nl_socket_get_fd(sock_rtnl_event
);
68 uloop_fd_add(&rtnl_event
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
73 nl_socket_free(sock_rtnl_event
);
74 sock_rtnl_event
= NULL
;
76 nl_cb_put(nl_cb_rtnl_event
);
77 nl_cb_rtnl_event
= NULL
;
79 nl_socket_free(sock_rtnl
);
84 // If socket is ready for reading parse netlink events
85 static void handler_rtnl_event(struct uloop_fd
*u
, unsigned int events
)
87 nl_recvmsgs(sock_rtnl_event
, nl_cb_rtnl_event
);
90 // Evaluate netlink messages
91 static int cb_rtnl_event(struct nl_msg
*msg
, void *arg
)
93 struct nlmsghdr
*nh
= nlmsg_hdr(msg
);
94 struct ifinfomsg
*ifi
= NLMSG_DATA(nh
);
95 struct nlattr
*nla
[__IFLA_MAX
];
97 if (nh
->nlmsg_type
!= RTM_DELLINK
&& nh
->nlmsg_type
!= RTM_NEWLINK
)
100 nlmsg_parse(nh
, sizeof(*ifi
), nla
, __IFLA_MAX
- 1, NULL
);
101 if (!nla
[IFLA_IFNAME
])
104 struct device
*dev
= device_get(RTA_DATA(nla
[IFLA_IFNAME
]), false);
108 dev
->ifindex
= ifi
->ifi_index
;
109 device_set_present(dev
, (nh
->nlmsg_type
== RTM_NEWLINK
));
115 static int system_rtnl_call(struct nl_msg
*msg
)
117 int s
= -(nl_send_auto_complete(sock_rtnl
, msg
)
118 || nl_wait_for_ack(sock_rtnl
));
123 int system_bridge_delbr(struct device
*bridge
)
125 return ioctl(sock_ioctl
, SIOCBRDELBR
, bridge
->ifname
);
128 static int system_bridge_if(const char *bridge
, struct device
*dev
, int cmd
, void *data
)
132 ifr
.ifr_ifindex
= dev
->ifindex
;
135 strncpy(ifr
.ifr_name
, bridge
, sizeof(ifr
.ifr_name
));
136 return ioctl(sock_ioctl
, cmd
, &ifr
);
139 int system_bridge_addif(struct device
*bridge
, struct device
*dev
)
141 return system_bridge_if(bridge
->ifname
, dev
, SIOCBRADDIF
, NULL
);
144 int system_bridge_delif(struct device
*bridge
, struct device
*dev
)
146 return system_bridge_if(bridge
->ifname
, dev
, SIOCBRDELIF
, NULL
);
149 static bool system_is_bridge(const char *name
, char *buf
, int buflen
)
153 snprintf(buf
, buflen
, "/sys/devices/virtual/net/%s/bridge", name
);
154 if (stat(buf
, &st
) < 0)
160 static char *system_get_bridge(const char *name
, char *buf
, int buflen
)
166 snprintf(buf
, buflen
, "/sys/devices/virtual/net/*/brif/%s/bridge", name
);
167 if (glob(buf
, GLOB_NOSORT
, NULL
, &gl
) < 0)
170 if (gl
.gl_pathc
== 0)
173 len
= readlink(gl
.gl_pathv
[0], buf
, buflen
);
178 path
= strrchr(buf
, '/');
185 static int system_if_resolve(struct device
*dev
)
188 strncpy(ifr
.ifr_name
, dev
->ifname
, sizeof(ifr
.ifr_name
));
189 if (!ioctl(sock_ioctl
, SIOCGIFINDEX
, &ifr
))
190 return ifr
.ifr_ifindex
;
195 static int system_if_flags(const char *ifname
, unsigned add
, unsigned rem
)
198 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
199 ioctl(sock_ioctl
, SIOCGIFFLAGS
, &ifr
);
200 ifr
.ifr_flags
|= add
;
201 ifr
.ifr_flags
&= ~rem
;
202 return ioctl(sock_ioctl
, SIOCSIFFLAGS
, &ifr
);
206 * Clear bridge (membership) state and bring down device
208 void system_if_clear_state(struct device
*dev
)
213 dev
->ifindex
= system_if_resolve(dev
);
217 system_if_flags(dev
->ifname
, 0, IFF_UP
);
219 if (system_is_bridge(dev
->ifname
, buf
, sizeof(buf
))) {
220 D(SYSTEM
, "Delete existing bridge named '%s'\n", dev
->ifname
);
221 system_bridge_delbr(dev
);
225 bridge
= system_get_bridge(dev
->ifname
, buf
, sizeof(buf
));
227 D(SYSTEM
, "Remove device '%s' from bridge '%s'\n", dev
->ifname
, bridge
);
228 system_bridge_if(bridge
, dev
, SIOCBRDELIF
, NULL
);
232 static inline unsigned long
233 sec_to_jiffies(int val
)
235 return (unsigned long) val
* 100;
238 int system_bridge_addbr(struct device
*bridge
, struct bridge_config
*cfg
)
240 unsigned long args
[4] = {};
242 if (ioctl(sock_ioctl
, SIOCBRADDBR
, bridge
->ifname
) < 0)
245 args
[0] = BRCTL_SET_BRIDGE_STP_STATE
;
246 args
[1] = !!cfg
->stp
;
247 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
249 args
[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY
;
250 args
[1] = sec_to_jiffies(cfg
->forward_delay
);
251 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
253 if (cfg
->flags
& BRIDGE_OPT_AGEING_TIME
) {
254 args
[0] = BRCTL_SET_AGEING_TIME
;
255 args
[1] = sec_to_jiffies(cfg
->ageing_time
);
256 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
259 if (cfg
->flags
& BRIDGE_OPT_HELLO_TIME
) {
260 args
[0] = BRCTL_SET_BRIDGE_HELLO_TIME
;
261 args
[1] = sec_to_jiffies(cfg
->hello_time
);
262 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
265 if (cfg
->flags
& BRIDGE_OPT_MAX_AGE
) {
266 args
[0] = BRCTL_SET_BRIDGE_MAX_AGE
;
267 args
[1] = sec_to_jiffies(cfg
->max_age
);
268 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
274 static int system_vlan(struct device
*dev
, int id
)
276 struct vlan_ioctl_args ifr
= {
277 .cmd
= SET_VLAN_NAME_TYPE_CMD
,
278 .u
.name_type
= VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
,
281 ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
284 ifr
.cmd
= DEL_VLAN_CMD
;
287 ifr
.cmd
= ADD_VLAN_CMD
;
290 strncpy(ifr
.device1
, dev
->ifname
, sizeof(ifr
.device1
));
291 return ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
294 int system_vlan_add(struct device
*dev
, int id
)
296 return system_vlan(dev
, id
);
299 int system_vlan_del(struct device
*dev
)
301 return system_vlan(dev
, -1);
304 int system_if_up(struct device
*dev
)
306 dev
->ifindex
= system_if_resolve(dev
);
307 return system_if_flags(dev
->ifname
, IFF_UP
, 0);
310 int system_if_down(struct device
*dev
)
312 return system_if_flags(dev
->ifname
, 0, IFF_UP
);
315 int system_if_check(struct device
*dev
)
317 device_set_present(dev
, (system_if_resolve(dev
) >= 0));
321 int system_if_dump_stats(struct device
*dev
, struct blob_buf
*b
)
323 const char *const counters
[] = {
324 "collisions", "rx_frame_errors", "tx_compressed",
325 "multicast", "rx_length_errors", "tx_dropped",
326 "rx_bytes", "rx_missed_errors", "tx_errors",
327 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
328 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
329 "rx_dropped", "tx_aborted_errors", "tx_packets",
330 "rx_errors", "tx_bytes", "tx_window_errors",
331 "rx_fifo_errors", "tx_carrier_errors",
337 snprintf(buf
, sizeof(buf
), "/sys/class/net/%s/statistics", dev
->ifname
);
338 stats_dir
= open(buf
, O_DIRECTORY
);
342 for (i
= 0; i
< ARRAY_SIZE(counters
); i
++) {
343 fd
= openat(stats_dir
, counters
[i
], O_RDONLY
);
348 len
= read(fd
, buf
, sizeof(buf
));
356 blobmsg_add_u32(b
, counters
[i
], strtoul(buf
, NULL
, 0));
364 static int system_addr(struct device
*dev
, struct device_addr
*addr
, int cmd
)
366 int alen
= ((addr
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
367 struct ifaddrmsg ifa
= {
368 .ifa_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
369 .ifa_prefixlen
= addr
->mask
,
370 .ifa_index
= dev
->ifindex
,
373 struct nl_msg
*msg
= nlmsg_alloc_simple(cmd
, 0);
377 nlmsg_append(msg
, &ifa
, sizeof(ifa
), 0);
378 nla_put(msg
, IFA_LOCAL
, alen
, &addr
->addr
);
379 return system_rtnl_call(msg
);
382 int system_add_address(struct device
*dev
, struct device_addr
*addr
)
384 return system_addr(dev
, addr
, RTM_NEWADDR
);
387 int system_del_address(struct device
*dev
, struct device_addr
*addr
)
389 return system_addr(dev
, addr
, RTM_DELADDR
);
392 static int system_rt(struct device
*dev
, struct device_route
*route
, int cmd
)
394 int alen
= ((route
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
396 unsigned int flags
= 0;
399 have_gw
= !!route
->nexthop
.in
.s_addr
;
401 have_gw
= route
->nexthop
.in6
.s6_addr32
[0] ||
402 route
->nexthop
.in6
.s6_addr32
[1] ||
403 route
->nexthop
.in6
.s6_addr32
[2] ||
404 route
->nexthop
.in6
.s6_addr32
[3];
406 unsigned char scope
= (cmd
== RTM_DELROUTE
) ? RT_SCOPE_NOWHERE
:
407 (have_gw
) ? RT_SCOPE_UNIVERSE
: RT_SCOPE_LINK
;
410 .rtm_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
411 .rtm_dst_len
= route
->mask
,
412 .rtm_table
= RT_TABLE_MAIN
,
413 .rtm_protocol
= RTPROT_BOOT
,
415 .rtm_type
= (cmd
== RTM_DELROUTE
) ? 0: RTN_UNICAST
,
418 if (cmd
== RTM_NEWROUTE
)
419 flags
|= NLM_F_CREATE
| NLM_F_REPLACE
;
421 struct nl_msg
*msg
= nlmsg_alloc_simple(cmd
, flags
);
425 nlmsg_append(msg
, &rtm
, sizeof(rtm
), 0);
428 nla_put(msg
, RTA_DST
, alen
, &route
->addr
);
431 nla_put(msg
, RTA_GATEWAY
, alen
, &route
->nexthop
);
433 if (route
->flags
& DEVADDR_DEVICE
)
434 nla_put_u32(msg
, RTA_OIF
, dev
->ifindex
);
436 return system_rtnl_call(msg
);
439 int system_add_route(struct device
*dev
, struct device_route
*route
)
441 return system_rt(dev
, route
, RTM_NEWROUTE
);
444 int system_del_route(struct device
*dev
, struct device_route
*route
)
446 return system_rt(dev
, route
, RTM_DELROUTE
);
449 time_t system_get_rtime(void)
454 if (syscall(__NR_clock_gettime
, CLOCK_MONOTONIC
, &ts
) == 0)
457 if (gettimeofday(&tv
, NULL
) == 0)