/*
* Callback from wpa_supplicant client whenever the association state changes
* in a significant way.
*/
void
ni_wireless_association_changed(unsigned int ifindex, ni_wireless_assoc_state_t new_state)
{
ni_netconfig_t *nc = ni_global_state_handle(0);
ni_netdev_t *dev;
ni_wireless_t *wlan;
if (!(dev = ni_netdev_by_index(nc, ifindex)))
return;
if (!(wlan = dev->wireless))
return;
if (new_state == wlan->assoc.state)
return;
wlan->assoc.state = new_state;
if (new_state == NI_WIRELESS_ESTABLISHED)
__ni_netdev_event(nc, dev, NI_EVENT_LINK_ASSOCIATED);
/* We keep track of when we were last changing to or
* from fully authenticated state.
* We use this to decide when to give up and announce
* that we've lost the network - see the timer handling
* code above.
*/
ni_wireless_update_association_timer(dev);
}
static void
__ni_wireless_association_timeout(void *ptr, const ni_timer_t *timer)
{
ni_netconfig_t *nc = ni_global_state_handle(0);
ni_netdev_t *dev = ptr;
ni_wireless_t *wlan = dev->wireless;
if (wlan->assoc.timer != timer)
return;
ni_debug_wireless("%s: association timed out", dev->name);
wlan->assoc.timer = NULL;
__ni_netdev_event(nc, dev, NI_EVENT_LINK_DOWN);
__ni_netdev_event(nc, dev, NI_EVENT_LINK_ASSOCIATION_LOST);
ni_wireless_disconnect(dev);
}
/*
* Process NEWLINK event
*/
int
__ni_rtevent_newlink(ni_netconfig_t *nc, const struct sockaddr_nl *nladdr, struct nlmsghdr *h)
{
char namebuf[IF_NAMESIZE+1] = {'\0'};
ni_netdev_t *dev, *old;
struct ifinfomsg *ifi;
struct nlattr *nla;
char *ifname = NULL;
int old_flags = 0;
if (!(ifi = ni_rtnl_ifinfomsg(h, RTM_NEWLINK)))
return -1;
if (ifi->ifi_family == AF_BRIDGE)
return 0;
old = ni_netdev_by_index(nc, ifi->ifi_index);
ifname = if_indextoname(ifi->ifi_index, namebuf);
if (!ifname) {
/*
* device (index) does not exists any more;
* process deletion/cleanup of the device.
*/
if (old) {
old_flags = old->link.ifflags;
old->link.ifflags = 0;
old->deleted = 1;
__ni_netdev_process_events(nc, old, old_flags);
ni_client_state_drop(old->link.ifindex);
ni_netconfig_device_remove(nc, old);
}
return 0;
}
if (old) {
if (!ni_string_eq(old->name, ifname)) {
ni_debug_events("%s[%u]: device renamed to %s",
old->name, old->link.ifindex, ifname);
ni_string_dup(&old->name, ifname);
__ni_netdev_event(nc, old, NI_EVENT_DEVICE_RENAME);
}
dev = old;
old_flags = old->link.ifflags;
} else {
if (!(dev = ni_netdev_new(ifname, ifi->ifi_index))) {
ni_warn("%s[%u]: unable to allocate memory for device",
ifname, ifi->ifi_index);
return -1;
}
dev->created = 1;
ni_netconfig_device_append(nc, dev);
}
if (__ni_netdev_process_newlink(dev, h, ifi, nc) < 0) {
ni_error("Problem parsing RTM_NEWLINK message for %s", ifname);
return -1;
}
if ((ifname = dev->name)) {
ni_netdev_t *conflict;
conflict = ni_netdev_by_name(nc, ifname);
if (conflict && conflict->link.ifindex != (unsigned int)ifi->ifi_index) {
/*
* As the events often provide an already obsolete name [2 events,
* we process 1st with next in read buffer], we are reading the
* current dev->name in advance (above).
*
* On a rename like eth0->rename1->eth1, eth1->rename2->eth0, the
* current dev->name is already eth1 at processing time of eth0
* to rename1 event. This sometimes causes that we find eth1 in
* our device list [eth1 -> rename2 event in the read buffer].
*
* Just update the name of the conflicting device in advance too
* and when the interface does not exist any more, emit events.
*/
char *current = if_indextoname(conflict->link.ifindex, namebuf);
if (current) {
ni_string_dup(&conflict->name, current);
__ni_netdev_event(nc, conflict, NI_EVENT_DEVICE_RENAME);
} else {
unsigned int ifflags = conflict->link.ifflags;
conflict->link.ifflags = 0;
conflict->deleted = 1;
__ni_netdev_process_events(nc, conflict, ifflags);
ni_client_state_drop(conflict->link.ifindex);
ni_netconfig_device_remove(nc, conflict);
}
}
}
__ni_netdev_process_events(nc, dev, old_flags);
if ((nla = nlmsg_find_attr(h, sizeof(*ifi), IFLA_WIRELESS)) != NULL)
__ni_wireless_link_event(nc, dev, nla_data(nla), nla_len(nla));
return 0;
}
/*
* Process device state change events
*/
void
__ni_netdev_process_events(ni_netconfig_t *nc, ni_netdev_t *dev, unsigned int old_flags)
{
static struct flag_transition {
unsigned int flag;
unsigned int event_up;
unsigned int event_down;
} *edge, flag_transitions[] = {
{ NI_IFF_DEVICE_READY, NI_EVENT_DEVICE_READY, 0 },
{ NI_IFF_DEVICE_UP, NI_EVENT_DEVICE_UP, NI_EVENT_DEVICE_DOWN },
{ NI_IFF_LINK_UP, NI_EVENT_LINK_UP, NI_EVENT_LINK_DOWN },
{ NI_IFF_NETWORK_UP, NI_EVENT_NETWORK_UP, NI_EVENT_NETWORK_DOWN },
};
size_t flags = sizeof(flag_transitions)/sizeof(flag_transitions[0]);
unsigned int i, new_flags, flags_changed;
ni_uint_array_t events = NI_UINT_ARRAY_INIT;
new_flags = dev->link.ifflags;
flags_changed = old_flags ^ new_flags;
if (dev->created) {
dev->created = 0;
ni_uint_array_append(&events, NI_EVENT_DEVICE_CREATE);
}
/* transition up */
for (i = 0; i < flags; ++i) {
edge = &flag_transitions[i];
if ((flags_changed & edge->flag) == 0)
continue;
if (new_flags & edge->flag) {
ni_uint_array_append(&events, edge->event_up);
}
}
/* transition down */
for (i = flags; i-- > 0; ) {
edge = &flag_transitions[i];
if ((flags_changed & edge->flag) == 0)
continue;
if (old_flags & edge->flag) {
if (dev->ipv6 && edge->event_down == NI_EVENT_DEVICE_DOWN)
ni_ipv6_ra_info_flush(&dev->ipv6->radv);
if (edge->event_down)
ni_uint_array_append(&events, edge->event_down);
}
}
if (dev->deleted) {
dev->deleted = 0;
ni_uint_array_append(&events, NI_EVENT_DEVICE_DELETE);
} else
if (events.count == 0) {
__ni_netdev_event(nc, dev, NI_EVENT_DEVICE_CHANGE);
}
for (i = 0; i < events.count; ++i) {
__ni_netdev_event(nc, dev, events.data[i]);
}
ni_uint_array_destroy(&events);
}
/*
* Initiate a network scan
*/
int
__ni_wireless_do_scan(ni_netdev_t *dev)
{
ni_wpa_interface_t *wpa_dev;
ni_wireless_t *wlan;
ni_wireless_scan_t *scan;
time_t now;
wlan = dev->wireless;
if ((scan = wlan->scan) == NULL) {
ni_error("%s: no wireless scan handle?!", __func__);
return -1;
}
/* (Re-)arm the scan timer */
__ni_wireless_scan_timer_arm(scan, dev, scan->interval);
/* If the device is down, we cannot scan */
if (!ni_netdev_device_is_up(dev))
return 0;
if (ni_rfkill_disabled(NI_RFKILL_TYPE_WIRELESS))
return -NI_ERROR_RADIO_DISABLED;
if (!(wpa_dev = ni_wireless_bind_supplicant(dev)))
return -1;
wlan->capabilities = wpa_dev->capabilities;
/* We currently don't have a reasonable way to call back
* to a higher level from the depths of the wpa-supplicant
* code. Thus we have to result to polling here :-(
*/
if (ni_wpa_interface_scan_in_progress(wpa_dev)) {
__ni_wireless_scan_timer_arm(scan, dev, 1);
return 0;
}
/* Retrieve whatever is there. */
if (ni_wpa_interface_retrieve_scan(wpa_dev, scan)) {
ni_netconfig_t *nc = ni_global_state_handle(0);
ni_debug_wireless("%s: list of networks changed", dev->name);
__ni_netdev_event(nc, dev, NI_EVENT_LINK_SCAN_UPDATED);
}
/* If we haven't seen a scan in a long time, request one. */
now = time(NULL);
if (scan->timestamp + scan->interval < now) {
/* We can do this only if the device is up */
if (dev->link.ifflags & NI_IFF_DEVICE_UP) {
if (scan->timestamp)
ni_debug_wireless("%s: requesting wireless scan (last scan was %u seconds ago)",
dev->name, (unsigned int) (now - scan->timestamp));
else
ni_debug_wireless("%s: requesting wireless scan", dev->name);
ni_wpa_interface_request_scan(wpa_dev, scan);
}
}
return 0;
}