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 static void system_set_sysctl(const char *path
, const char *val
)
94 fd
= open(path
, O_WRONLY
);
98 write(fd
, val
, strlen(val
));
102 static void system_set_dev_sysctl(const char *path
, const char *device
, const char *val
)
106 snprintf(buf
, sizeof(buf
), path
, val
);
107 system_set_sysctl(buf
, val
);
110 static void system_set_disable_ipv6(struct device
*dev
, const char *val
)
112 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev
->ifname
, val
);
115 // Evaluate netlink messages
116 static int cb_rtnl_event(struct nl_msg
*msg
, void *arg
)
118 struct nlmsghdr
*nh
= nlmsg_hdr(msg
);
119 struct ifinfomsg
*ifi
= NLMSG_DATA(nh
);
120 struct nlattr
*nla
[__IFLA_MAX
];
122 if (nh
->nlmsg_type
!= RTM_DELLINK
&& nh
->nlmsg_type
!= RTM_NEWLINK
)
125 nlmsg_parse(nh
, sizeof(*ifi
), nla
, __IFLA_MAX
- 1, NULL
);
126 if (!nla
[IFLA_IFNAME
])
129 struct device
*dev
= device_get(RTA_DATA(nla
[IFLA_IFNAME
]), false);
133 dev
->ifindex
= ifi
->ifi_index
;
134 device_set_present(dev
, (nh
->nlmsg_type
== RTM_NEWLINK
));
140 static int system_rtnl_call(struct nl_msg
*msg
)
142 int s
= -(nl_send_auto_complete(sock_rtnl
, msg
)
143 || nl_wait_for_ack(sock_rtnl
));
148 int system_bridge_delbr(struct device
*bridge
)
150 return ioctl(sock_ioctl
, SIOCBRDELBR
, bridge
->ifname
);
153 static int system_bridge_if(const char *bridge
, struct device
*dev
, int cmd
, void *data
)
157 ifr
.ifr_ifindex
= dev
->ifindex
;
160 strncpy(ifr
.ifr_name
, bridge
, sizeof(ifr
.ifr_name
));
161 return ioctl(sock_ioctl
, cmd
, &ifr
);
164 int system_bridge_addif(struct device
*bridge
, struct device
*dev
)
166 system_set_disable_ipv6(dev
, "1");
167 return system_bridge_if(bridge
->ifname
, dev
, SIOCBRADDIF
, NULL
);
170 int system_bridge_delif(struct device
*bridge
, struct device
*dev
)
172 system_set_disable_ipv6(dev
, "0");
173 return system_bridge_if(bridge
->ifname
, dev
, SIOCBRDELIF
, NULL
);
176 static bool system_is_bridge(const char *name
, char *buf
, int buflen
)
180 snprintf(buf
, buflen
, "/sys/devices/virtual/net/%s/bridge", name
);
181 if (stat(buf
, &st
) < 0)
187 static char *system_get_bridge(const char *name
, char *buf
, int buflen
)
193 snprintf(buf
, buflen
, "/sys/devices/virtual/net/*/brif/%s/bridge", name
);
194 if (glob(buf
, GLOB_NOSORT
, NULL
, &gl
) < 0)
197 if (gl
.gl_pathc
== 0)
200 len
= readlink(gl
.gl_pathv
[0], buf
, buflen
);
205 path
= strrchr(buf
, '/');
212 static int system_if_resolve(struct device
*dev
)
215 strncpy(ifr
.ifr_name
, dev
->ifname
, sizeof(ifr
.ifr_name
));
216 if (!ioctl(sock_ioctl
, SIOCGIFINDEX
, &ifr
))
217 return ifr
.ifr_ifindex
;
222 static int system_if_flags(const char *ifname
, unsigned add
, unsigned rem
)
225 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
226 ioctl(sock_ioctl
, SIOCGIFFLAGS
, &ifr
);
227 ifr
.ifr_flags
|= add
;
228 ifr
.ifr_flags
&= ~rem
;
229 return ioctl(sock_ioctl
, SIOCSIFFLAGS
, &ifr
);
241 static bool check_ifaddr(struct nlmsghdr
*hdr
, int ifindex
)
243 struct ifaddrmsg
*ifa
= NLMSG_DATA(hdr
);
245 return ifa
->ifa_index
== ifindex
;
248 static bool check_route(struct nlmsghdr
*hdr
, int ifindex
)
250 struct nlattr
*tb
[__RTA_MAX
];
252 nlmsg_parse(hdr
, sizeof(struct rtmsg
), tb
, __RTA_MAX
- 1, NULL
);
256 return *(int *)RTA_DATA(tb
[RTA_OIF
]) == ifindex
;
259 static int cb_clear_event(struct nl_msg
*msg
, void *arg
)
261 struct clear_data
*clr
= arg
;
262 struct nlmsghdr
*hdr
= nlmsg_hdr(msg
);
263 bool (*cb
)(struct nlmsghdr
*, int ifindex
);
269 if (hdr
->nlmsg_type
!= RTM_NEWADDR
)
276 if (hdr
->nlmsg_type
!= RTM_NEWROUTE
)
285 if (!cb(hdr
, clr
->dev
->ifindex
))
288 D(SYSTEM
, "Remove %s from device %s\n",
289 type
== RTM_DELADDR
? "an address" : "a route",
291 memcpy(nlmsg_hdr(clr
->msg
), hdr
, hdr
->nlmsg_len
);
292 hdr
= nlmsg_hdr(clr
->msg
);
293 hdr
->nlmsg_type
= type
;
294 hdr
->nlmsg_flags
= NLM_F_REQUEST
;
296 if (!nl_send_auto_complete(sock_rtnl
, clr
->msg
))
297 nl_wait_for_ack(sock_rtnl
);
303 cb_finish_event(struct nl_msg
*msg
, void *arg
)
311 error_handler(struct sockaddr_nl
*nla
, struct nlmsgerr
*err
, void *arg
)
314 *pending
= err
->error
;
319 system_if_clear_entries(struct device
*dev
, int type
, int af
)
321 struct clear_data clr
;
322 struct nl_cb
*cb
= nl_cb_alloc(NL_CB_DEFAULT
);
325 .rtm_flags
= RTM_F_CLONED
,
327 int flags
= NLM_F_DUMP
;
335 clr
.size
= sizeof(struct rtgenmsg
);
338 clr
.size
= sizeof(struct rtmsg
);
347 clr
.msg
= nlmsg_alloc_simple(type
, flags
);
351 nlmsg_append(clr
.msg
, &rtm
, clr
.size
, 0);
352 nl_cb_set(cb
, NL_CB_VALID
, NL_CB_CUSTOM
, cb_clear_event
, &clr
);
353 nl_cb_set(cb
, NL_CB_FINISH
, NL_CB_CUSTOM
, cb_finish_event
, &pending
);
354 nl_cb_err(cb
, NL_CB_CUSTOM
, error_handler
, &pending
);
356 nl_send_auto_complete(sock_rtnl
, clr
.msg
);
358 nl_recvmsgs(sock_rtnl
, cb
);
366 * Clear bridge (membership) state and bring down device
368 void system_if_clear_state(struct device
*dev
)
373 dev
->ifindex
= system_if_resolve(dev
);
377 system_if_flags(dev
->ifname
, 0, IFF_UP
);
379 if (system_is_bridge(dev
->ifname
, buf
, sizeof(buf
))) {
380 D(SYSTEM
, "Delete existing bridge named '%s'\n", dev
->ifname
);
381 system_bridge_delbr(dev
);
385 bridge
= system_get_bridge(dev
->ifname
, buf
, sizeof(buf
));
387 D(SYSTEM
, "Remove device '%s' from bridge '%s'\n", dev
->ifname
, bridge
);
388 system_bridge_if(bridge
, dev
, SIOCBRDELIF
, NULL
);
391 system_if_clear_entries(dev
, RTM_GETROUTE
, AF_INET
);
392 system_if_clear_entries(dev
, RTM_GETADDR
, AF_INET
);
393 system_if_clear_entries(dev
, RTM_GETROUTE
, AF_INET6
);
394 system_if_clear_entries(dev
, RTM_GETADDR
, AF_INET6
);
395 system_set_disable_ipv6(dev
, "0");
398 static inline unsigned long
399 sec_to_jiffies(int val
)
401 return (unsigned long) val
* 100;
404 int system_bridge_addbr(struct device
*bridge
, struct bridge_config
*cfg
)
406 unsigned long args
[4] = {};
408 if (ioctl(sock_ioctl
, SIOCBRADDBR
, bridge
->ifname
) < 0)
411 args
[0] = BRCTL_SET_BRIDGE_STP_STATE
;
412 args
[1] = !!cfg
->stp
;
413 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
415 args
[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY
;
416 args
[1] = sec_to_jiffies(cfg
->forward_delay
);
417 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
419 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
420 bridge
->ifname
, cfg
->igmp_snoop
? "1" : "0");
422 if (cfg
->flags
& BRIDGE_OPT_AGEING_TIME
) {
423 args
[0] = BRCTL_SET_AGEING_TIME
;
424 args
[1] = sec_to_jiffies(cfg
->ageing_time
);
425 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
428 if (cfg
->flags
& BRIDGE_OPT_HELLO_TIME
) {
429 args
[0] = BRCTL_SET_BRIDGE_HELLO_TIME
;
430 args
[1] = sec_to_jiffies(cfg
->hello_time
);
431 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
434 if (cfg
->flags
& BRIDGE_OPT_MAX_AGE
) {
435 args
[0] = BRCTL_SET_BRIDGE_MAX_AGE
;
436 args
[1] = sec_to_jiffies(cfg
->max_age
);
437 system_bridge_if(bridge
->ifname
, NULL
, SIOCDEVPRIVATE
, &args
);
443 static int system_vlan(struct device
*dev
, int id
)
445 struct vlan_ioctl_args ifr
= {
446 .cmd
= SET_VLAN_NAME_TYPE_CMD
,
447 .u
.name_type
= VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
,
450 ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
453 ifr
.cmd
= DEL_VLAN_CMD
;
456 ifr
.cmd
= ADD_VLAN_CMD
;
459 strncpy(ifr
.device1
, dev
->ifname
, sizeof(ifr
.device1
));
460 return ioctl(sock_ioctl
, SIOCSIFVLAN
, &ifr
);
463 int system_vlan_add(struct device
*dev
, int id
)
465 return system_vlan(dev
, id
);
468 int system_vlan_del(struct device
*dev
)
470 return system_vlan(dev
, -1);
474 system_if_apply_settings(struct device
*dev
)
478 memset(&ifr
, 0, sizeof(ifr
));
479 strncpy(ifr
.ifr_name
, dev
->ifname
, sizeof(ifr
.ifr_name
));
480 if (dev
->flags
& DEV_OPT_MTU
) {
481 ifr
.ifr_mtu
= dev
->mtu
;
482 ioctl(sock_ioctl
, SIOCSIFMTU
, &ifr
);
484 if (dev
->flags
& DEV_OPT_TXQUEUELEN
) {
485 ifr
.ifr_qlen
= dev
->txqueuelen
;
486 ioctl(sock_ioctl
, SIOCSIFTXQLEN
, &ifr
);
488 if (dev
->flags
& DEV_OPT_MACADDR
) {
489 memcpy(&ifr
.ifr_hwaddr
, dev
->macaddr
, sizeof(dev
->macaddr
));
490 ioctl(sock_ioctl
, SIOCSIFHWADDR
, &ifr
);
493 dev
->ifindex
= system_if_resolve(dev
);
496 int system_if_up(struct device
*dev
)
498 system_if_apply_settings(dev
);
499 return system_if_flags(dev
->ifname
, IFF_UP
, 0);
502 int system_if_down(struct device
*dev
)
504 return system_if_flags(dev
->ifname
, 0, IFF_UP
);
507 int system_if_check(struct device
*dev
)
509 device_set_present(dev
, (system_if_resolve(dev
) >= 0));
513 int system_if_dump_stats(struct device
*dev
, struct blob_buf
*b
)
515 const char *const counters
[] = {
516 "collisions", "rx_frame_errors", "tx_compressed",
517 "multicast", "rx_length_errors", "tx_dropped",
518 "rx_bytes", "rx_missed_errors", "tx_errors",
519 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
520 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
521 "rx_dropped", "tx_aborted_errors", "tx_packets",
522 "rx_errors", "tx_bytes", "tx_window_errors",
523 "rx_fifo_errors", "tx_carrier_errors",
529 snprintf(buf
, sizeof(buf
), "/sys/class/net/%s/statistics", dev
->ifname
);
530 stats_dir
= open(buf
, O_DIRECTORY
);
534 for (i
= 0; i
< ARRAY_SIZE(counters
); i
++) {
535 fd
= openat(stats_dir
, counters
[i
], O_RDONLY
);
540 len
= read(fd
, buf
, sizeof(buf
));
548 blobmsg_add_u32(b
, counters
[i
], strtoul(buf
, NULL
, 0));
556 static int system_addr(struct device
*dev
, struct device_addr
*addr
, int cmd
)
558 int alen
= ((addr
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
559 struct ifaddrmsg ifa
= {
560 .ifa_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
561 .ifa_prefixlen
= addr
->mask
,
562 .ifa_index
= dev
->ifindex
,
572 ifa
.ifa_index
= dev
->ifindex
;
575 msg
= nlmsg_alloc_simple(cmd
, 0);
579 nlmsg_append(msg
, &ifa
, sizeof(ifa
), 0);
580 nla_put(msg
, IFA_LOCAL
, alen
, &addr
->addr
);
581 return system_rtnl_call(msg
);
584 int system_add_address(struct device
*dev
, struct device_addr
*addr
)
586 return system_addr(dev
, addr
, RTM_NEWADDR
);
589 int system_del_address(struct device
*dev
, struct device_addr
*addr
)
591 return system_addr(dev
, addr
, RTM_DELADDR
);
594 static int system_rt(struct device
*dev
, struct device_route
*route
, int cmd
)
596 int alen
= ((route
->flags
& DEVADDR_FAMILY
) == DEVADDR_INET4
) ? 4 : 16;
598 unsigned int flags
= 0;
599 int ifindex
= dev
->ifindex
;
602 have_gw
= !!route
->nexthop
.in
.s_addr
;
604 have_gw
= route
->nexthop
.in6
.s6_addr32
[0] ||
605 route
->nexthop
.in6
.s6_addr32
[1] ||
606 route
->nexthop
.in6
.s6_addr32
[2] ||
607 route
->nexthop
.in6
.s6_addr32
[3];
609 unsigned char scope
= (cmd
== RTM_DELROUTE
) ? RT_SCOPE_NOWHERE
:
610 (have_gw
) ? RT_SCOPE_UNIVERSE
: RT_SCOPE_LINK
;
613 .rtm_family
= (alen
== 4) ? AF_INET
: AF_INET6
,
614 .rtm_dst_len
= route
->mask
,
615 .rtm_table
= RT_TABLE_MAIN
,
616 .rtm_protocol
= RTPROT_BOOT
,
618 .rtm_type
= (cmd
== RTM_DELROUTE
) ? 0: RTN_UNICAST
,
622 if (cmd
== RTM_NEWROUTE
)
623 flags
|= NLM_F_CREATE
| NLM_F_REPLACE
;
630 ifindex
= dev
->ifindex
;
633 msg
= nlmsg_alloc_simple(cmd
, flags
);
637 nlmsg_append(msg
, &rtm
, sizeof(rtm
), 0);
640 nla_put(msg
, RTA_DST
, alen
, &route
->addr
);
643 nla_put(msg
, RTA_GATEWAY
, alen
, &route
->nexthop
);
645 if (route
->flags
& DEVADDR_DEVICE
)
646 nla_put_u32(msg
, RTA_OIF
, ifindex
);
648 return system_rtnl_call(msg
);
651 int system_add_route(struct device
*dev
, struct device_route
*route
)
653 return system_rt(dev
, route
, RTM_NEWROUTE
);
656 int system_del_route(struct device
*dev
, struct device_route
*route
)
658 return system_rt(dev
, route
, RTM_DELROUTE
);
661 int system_flush_routes(void)
663 const char *names
[] = {
664 "/proc/sys/net/ipv4/route/flush",
665 "/proc/sys/net/ipv6/route/flush"
669 for (i
= 0; i
< ARRAY_SIZE(names
); i
++) {
670 fd
= open(names
[i
], O_WRONLY
);
680 time_t system_get_rtime(void)
685 if (syscall(__NR_clock_gettime
, CLOCK_MONOTONIC
, &ts
) == 0)
688 if (gettimeofday(&tv
, NULL
) == 0)