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>
28 struct uloop_fd uloop
;
33 static int sock_ioctl
= -1;
34 static struct nl_sock
*sock_rtnl
= NULL
;
36 static int cb_rtnl_event(struct nl_msg
*msg
, void *arg
);
39 handler_nl_event(struct uloop_fd
*u
, unsigned int events
)
41 struct event_socket
*ev
= container_of(u
, struct event_socket
, uloop
);
42 nl_recvmsgs(ev
->sock
, ev
->cb
);
45 static struct nl_sock
*
46 create_socket(int protocol
)
50 sock
= nl_socket_alloc();
54 if (nl_connect(sock
, protocol
))
61 create_event_socket(struct event_socket
*ev
, int protocol
,
62 int (*cb
)(struct nl_msg
*msg
, void *arg
))
64 // Prepare socket for link events
65 ev
->cb
= nl_cb_alloc(NL_CB_DEFAULT
);
69 nl_cb_set(ev
->cb
, NL_CB_VALID
, NL_CB_CUSTOM
, cb
, NULL
);
71 ev
->sock
= create_socket(protocol
);
75 ev
->uloop
.fd
= nl_socket_get_fd(ev
->sock
);
76 ev
->uloop
.cb
= handler_nl_event
;
77 uloop_fd_add(&ev
->uloop
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
83 static struct event_socket rtnl_event
;
85 sock_ioctl
= socket(AF_LOCAL
, SOCK_DGRAM
, 0);
86 fcntl(sock_ioctl
, F_SETFD
, fcntl(sock_ioctl
, F_GETFD
) | FD_CLOEXEC
);
88 // Prepare socket for routing / address control
89 sock_rtnl
= create_socket(NETLINK_ROUTE
);
93 if (!create_event_socket(&rtnl_event
, NETLINK_ROUTE
, cb_rtnl_event
))
96 // Receive network link events form kernel
97 nl_socket_add_membership(rtnl_event
.sock
, RTNLGRP_LINK
);
102 static void system_set_sysctl(const char *path
, const char *val
)
106 fd
= open(path
, O_WRONLY
);
110 write(fd
, val
, strlen(val
));
114 static void system_set_dev_sysctl(const char *path
, const char *device
, const char *val
)
116 static char buf
[256];
118 snprintf(buf
, sizeof(buf
), path
, val
);
119 system_set_sysctl(buf
, val
);
122 static void system_set_disable_ipv6(struct device
*dev
, const char *val
)
124 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev
->ifname
, val
);
127 // Evaluate netlink messages
128 static int cb_rtnl_event(struct nl_msg
*msg
, void *arg
)
130 struct nlmsghdr
*nh
= nlmsg_hdr(msg
);
131 struct ifinfomsg
*ifi
= NLMSG_DATA(nh
);
132 struct nlattr
*nla
[__IFLA_MAX
];
134 if (nh
->nlmsg_type
!= RTM_DELLINK
&& nh
->nlmsg_type
!= RTM_NEWLINK
)
137 nlmsg_parse(nh
, sizeof(*ifi
), nla
, __IFLA_MAX
- 1, NULL
);
138 if (!nla
[IFLA_IFNAME
])
141 struct device
*dev
= device_get(RTA_DATA(nla
[IFLA_IFNAME
]), false);
145 dev
->ifindex
= ifi
->ifi_index
;
146 device_set_present(dev
, (nh
->nlmsg_type
== RTM_NEWLINK
));
152 static int system_rtnl_call(struct nl_msg
*msg
)
154 int s
= -(nl_send_auto_complete(sock_rtnl
, msg
)
155 || nl_wait_for_ack(sock_rtnl
));
160 int system_bridge_delbr(struct device
*bridge
)
162 return ioctl(sock_ioctl
, SIOCBRDELBR
, bridge
->ifname
);
165 static int system_bridge_if(const char *bridge
, struct device
*dev
, int cmd
, void *data
)
169 ifr
.ifr_ifindex
= dev
->ifindex
;
172 strncpy(ifr
.ifr_name
, bridge
, sizeof(ifr
.ifr_name
));
173 return ioctl(sock_ioctl
, cmd
, &ifr
);
176 int system_bridge_addif(struct device
*bridge
, struct device
*dev
)
178 system_set_disable_ipv6(dev
, "1");
179 return system_bridge_if(bridge
->ifname
, dev
, SIOCBRADDIF
, NULL
);
182 int system_bridge_delif(struct device
*bridge
, struct device
*dev
)
184 system_set_disable_ipv6(dev
, "0");
185 return system_bridge_if(bridge
->ifname
, dev
, SIOCBRDELIF
, NULL
);
188 static bool system_is_bridge(const char *name
, char *buf
, int buflen
)
192 snprintf(buf
, buflen
, "/sys/devices/virtual/net/%s/bridge", name
);
193 if (stat(buf
, &st
) < 0)
199 static char *system_get_bridge(const char *name
, char *buf
, int buflen
)
205 snprintf(buf
, buflen
, "/sys/devices/virtual/net/*/brif/%s/bridge", name
);
206 if (glob(buf
, GLOB_NOSORT
, NULL
, &gl
) < 0)
209 if (gl
.gl_pathc
== 0)
212 len
= readlink(gl
.gl_pathv
[0], buf
, buflen
);
217 path
= strrchr(buf
, '/');
224 static int system_if_resolve(struct device
*dev
)
227 strncpy(ifr
.ifr_name
, dev
->ifname
, sizeof(ifr
.ifr_name
));
228 if (!ioctl(sock_ioctl
, SIOCGIFINDEX
, &ifr
))
229 return ifr
.ifr_ifindex
;
234 static int system_if_flags(const char *ifname
, unsigned add
, unsigned rem
)
237 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
238 ioctl(sock_ioctl
, SIOCGIFFLAGS
, &ifr
);
239 ifr
.ifr_flags
|= add
;
240 ifr
.ifr_flags
&= ~rem
;
241 return ioctl(sock_ioctl
, SIOCSIFFLAGS
, &ifr
);
253 static bool check_ifaddr(struct nlmsghdr
*hdr
, int ifindex
)
255 struct ifaddrmsg
*ifa
= NLMSG_DATA(hdr
);
257 return ifa
->ifa_index
== ifindex
;
260 static bool check_route(struct nlmsghdr
*hdr
, int ifindex
)
262 struct nlattr
*tb
[__RTA_MAX
];
264 nlmsg_parse(hdr
, sizeof(struct rtmsg
), tb
, __RTA_MAX
- 1, NULL
);
268 return *(int *)RTA_DATA(tb
[RTA_OIF
]) == ifindex
;
271 static int cb_clear_event(struct nl_msg
*msg
, void *arg
)
273 struct clear_data
*clr
= arg
;
274 struct nlmsghdr
*hdr
= nlmsg_hdr(msg
);
275 bool (*cb
)(struct nlmsghdr
*, int ifindex
);
281 if (hdr
->nlmsg_type
!= RTM_NEWADDR
)
288 if (hdr
->nlmsg_type
!= RTM_NEWROUTE
)
297 if (!cb(hdr
, clr
->dev
->ifindex
))
300 D(SYSTEM
, "Remove %s from device %s\n",
301 type
== RTM_DELADDR
? "an address" : "a route",
303 memcpy(nlmsg_hdr(clr
->msg
), hdr
, hdr
->nlmsg_len
);
304 hdr
= nlmsg_hdr(clr
->msg
);
305 hdr
->nlmsg_type
= type
;
306 hdr
->nlmsg_flags
= NLM_F_REQUEST
;
308 if (!nl_send_auto_complete(sock_rtnl
, clr
->msg
))
309 nl_wait_for_ack(sock_rtnl
);
315 cb_finish_event(struct nl_msg
*msg
, void *arg
)
323 error_handler(struct sockaddr_nl
*nla
, struct nlmsgerr
*err
, void *arg
)
326 *pending
= err
->error
;
331 system_if_clear_entries(struct device
*dev
, int type
, int af
)
333 struct clear_data clr
;
334 struct nl_cb
*cb
= nl_cb_alloc(NL_CB_DEFAULT
);
337 .rtm_flags
= RTM_F_CLONED
,
339 int flags
= NLM_F_DUMP
;
347 clr
.size
= sizeof(struct rtgenmsg
);
350 clr
.size
= sizeof(struct rtmsg
);
359 clr
.msg
= nlmsg_alloc_simple(type
, flags
);
363 nlmsg_append(clr
.msg
, &rtm
, clr
.size
, 0);
364 nl_cb_set(cb
, NL_CB_VALID
, NL_CB_CUSTOM
, cb_clear_event
, &clr
);
365 nl_cb_set(cb
, NL_CB_FINISH
, NL_CB_CUSTOM
, cb_finish_event
, &pending
);
366 nl_cb_err(cb
, NL_CB_CUSTOM
, error_handler
, &pending
);
368 nl_send_auto_complete(sock_rtnl
, clr
.msg
);
370 nl_recvmsgs(sock_rtnl
, cb
);
378 * Clear bridge (membership) state and bring down device
380 void system_if_clear_state(struct device
*dev
)
382 static char buf
[256];
388 dev
->ifindex
= system_if_resolve(dev
);
392 system_if_flags(dev
->ifname
, 0, IFF_UP
);
394 if (system_is_bridge(dev
->ifname
, buf
, sizeof(buf
))) {
395 D(SYSTEM
, "Delete existing bridge named '%s'\n", dev
->ifname
);
396 system_bridge_delbr(dev
);
400 bridge
= system_get_bridge(dev
->ifname
, buf
, sizeof(buf
));
402 D(SYSTEM
, "Remove device '%s' from bridge '%s'\n", dev
->ifname
, bridge
);
403 system_bridge_if(bridge
, dev
, SIOCBRDELIF
, NULL
);
406 system_if_clear_entries(dev
, RTM_GETROUTE
, AF_INET
);
407 system_if_clear_entries(dev
, RTM_GETADDR
, AF_INET
);
408 system_if_clear_entries(dev
, RTM_GETROUTE
, AF_INET6
);
409 system_if_clear_entries(dev
, RTM_GETADDR
, AF_INET6
);
410 system_set_disable_ipv6(dev
, "0");
413 static inline unsigned long
414 sec_to_jiffies(int val
)
416 return (unsigned long) val
* 100;
419 int system_bridge_addbr(struct device
*bridge
, struct bridge_config
*cfg
)
421 unsigned long args
[4] = {};
423 if (ioctl(sock_ioctl
, SIOCBRADDBR
, bridge
->ifname
) < 0)
426 args
[0] = BRCTL_SET_BRIDGE_STP_STATE
;
427 args
[1] = !!cfg
->stp
;
428 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
430 args
[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY
;
431 args
[1] = sec_to_jiffies(cfg
->forward_delay
);
432 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
434 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
435 bridge
->ifname
, cfg
->igmp_snoop
? "1" : "0");
437 if (cfg
->flags
& BRIDGE_OPT_AGEING_TIME
) {
438 args
[0] = BRCTL_SET_AGEING_TIME
;
439 args
[1] = sec_to_jiffies(cfg
->ageing_time
);
440 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
443 if (cfg
->flags
& BRIDGE_OPT_HELLO_TIME
) {
444 args
[0] = BRCTL_SET_BRIDGE_HELLO_TIME
;
445 args
[1] = sec_to_jiffies(cfg
->hello_time
);
446 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
449 if (cfg
->flags
& BRIDGE_OPT_MAX_AGE
) {
450 args
[0] = BRCTL_SET_BRIDGE_MAX_AGE
;
451 args
[1] = sec_to_jiffies(cfg
->max_age
);
452 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
458 static int system_vlan(struct device
*dev
, int id
)
460 struct vlan_ioctl_args ifr
= {
461 .cmd
= SET_VLAN_NAME_TYPE_CMD
,
462 .u
.name_type
= VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
,
465 ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
468 ifr
.cmd
= DEL_VLAN_CMD
;
471 ifr
.cmd
= ADD_VLAN_CMD
;
474 strncpy(ifr
.device1
, dev
->ifname
, sizeof(ifr
.device1
));
475 return ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
478 int system_vlan_add(struct device
*dev
, int id
)
480 return system_vlan(dev
, id
);
483 int system_vlan_del(struct device
*dev
)
485 return system_vlan(dev
, -1);
489 system_if_apply_settings(struct device
*dev
)
493 memset(&ifr
, 0, sizeof(ifr
));
494 strncpy(ifr
.ifr_name
, dev
->ifname
, sizeof(ifr
.ifr_name
));
495 if (dev
->flags
& DEV_OPT_MTU
) {
496 ifr
.ifr_mtu
= dev
->mtu
;
497 ioctl(sock_ioctl
, SIOCSIFMTU
, &ifr
);
499 if (dev
->flags
& DEV_OPT_TXQUEUELEN
) {
500 ifr
.ifr_qlen
= dev
->txqueuelen
;
501 ioctl(sock_ioctl
, SIOCSIFTXQLEN
, &ifr
);
503 if (dev
->flags
& DEV_OPT_MACADDR
) {
504 memcpy(&ifr
.ifr_hwaddr
, dev
->macaddr
, sizeof(dev
->macaddr
));
505 ioctl(sock_ioctl
, SIOCSIFHWADDR
, &ifr
);
508 dev
->ifindex
= system_if_resolve(dev
);
511 int system_if_up(struct device
*dev
)
513 system_if_apply_settings(dev
);
514 return system_if_flags(dev
->ifname
, IFF_UP
, 0);
517 int system_if_down(struct device
*dev
)
519 return system_if_flags(dev
->ifname
, 0, IFF_UP
);
522 int system_if_check(struct device
*dev
)
524 device_set_present(dev
, (system_if_resolve(dev
) >= 0));
528 int system_if_dump_stats(struct device
*dev
, struct blob_buf
*b
)
530 const char *const counters
[] = {
531 "collisions", "rx_frame_errors", "tx_compressed",
532 "multicast", "rx_length_errors", "tx_dropped",
533 "rx_bytes", "rx_missed_errors", "tx_errors",
534 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
535 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
536 "rx_dropped", "tx_aborted_errors", "tx_packets",
537 "rx_errors", "tx_bytes", "tx_window_errors",
538 "rx_fifo_errors", "tx_carrier_errors",
544 snprintf(buf
, sizeof(buf
), "/sys/class/net/%s/statistics", dev
->ifname
);
545 stats_dir
= open(buf
, O_DIRECTORY
);
549 for (i
= 0; i
< ARRAY_SIZE(counters
); i
++) {
550 fd
= openat(stats_dir
, counters
[i
], O_RDONLY
);
555 len
= read(fd
, buf
, sizeof(buf
));
563 blobmsg_add_u32(b
, counters
[i
], strtoul(buf
, NULL
, 0));
571 static int system_addr(struct device
*dev
, struct device_addr
*addr
, int cmd
)
573 int alen
= ((addr
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
574 struct ifaddrmsg ifa
= {
575 .ifa_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
576 .ifa_prefixlen
= addr
->mask
,
577 .ifa_index
= dev
->ifindex
,
587 ifa
.ifa_index
= dev
->ifindex
;
590 msg
= nlmsg_alloc_simple(cmd
, 0);
594 nlmsg_append(msg
, &ifa
, sizeof(ifa
), 0);
595 nla_put(msg
, IFA_LOCAL
, alen
, &addr
->addr
);
596 return system_rtnl_call(msg
);
599 int system_add_address(struct device
*dev
, struct device_addr
*addr
)
601 return system_addr(dev
, addr
, RTM_NEWADDR
);
604 int system_del_address(struct device
*dev
, struct device_addr
*addr
)
606 return system_addr(dev
, addr
, RTM_DELADDR
);
609 static int system_rt(struct device
*dev
, struct device_route
*route
, int cmd
)
611 int alen
= ((route
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
613 unsigned int flags
= 0;
614 int ifindex
= dev
->ifindex
;
617 have_gw
= !!route
->nexthop
.in
.s_addr
;
619 have_gw
= route
->nexthop
.in6
.s6_addr32
[0] ||
620 route
->nexthop
.in6
.s6_addr32
[1] ||
621 route
->nexthop
.in6
.s6_addr32
[2] ||
622 route
->nexthop
.in6
.s6_addr32
[3];
624 unsigned char scope
= (cmd
== RTM_DELROUTE
) ? RT_SCOPE_NOWHERE
:
625 (have_gw
) ? RT_SCOPE_UNIVERSE
: RT_SCOPE_LINK
;
628 .rtm_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
629 .rtm_dst_len
= route
->mask
,
630 .rtm_table
= RT_TABLE_MAIN
,
631 .rtm_protocol
= RTPROT_BOOT
,
633 .rtm_type
= (cmd
== RTM_DELROUTE
) ? 0: RTN_UNICAST
,
637 if (cmd
== RTM_NEWROUTE
)
638 flags
|= NLM_F_CREATE
| NLM_F_REPLACE
;
645 ifindex
= dev
->ifindex
;
648 msg
= nlmsg_alloc_simple(cmd
, flags
);
652 nlmsg_append(msg
, &rtm
, sizeof(rtm
), 0);
655 nla_put(msg
, RTA_DST
, alen
, &route
->addr
);
658 nla_put(msg
, RTA_GATEWAY
, alen
, &route
->nexthop
);
660 if (route
->flags
& DEVADDR_DEVICE
)
661 nla_put_u32(msg
, RTA_OIF
, ifindex
);
663 return system_rtnl_call(msg
);
666 int system_add_route(struct device
*dev
, struct device_route
*route
)
668 return system_rt(dev
, route
, RTM_NEWROUTE
);
671 int system_del_route(struct device
*dev
, struct device_route
*route
)
673 return system_rt(dev
, route
, RTM_DELROUTE
);
676 int system_flush_routes(void)
678 const char *names
[] = {
679 "/proc/sys/net/ipv4/route/flush",
680 "/proc/sys/net/ipv6/route/flush"
684 for (i
= 0; i
< ARRAY_SIZE(names
); i
++) {
685 fd
= open(names
[i
], O_WRONLY
);
695 time_t system_get_rtime(void)
700 if (syscall(__NR_clock_gettime
, CLOCK_MONOTONIC
, &ts
) == 0)
703 if (gettimeofday(&tv
, NULL
) == 0)