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Change netlink event handling so that the DHCP client will sleep if the

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interface carrier is lost or the interface is deconfigured but still exists,
eg via ifconfig down.  If the hardware is removed, then ndhcp will exit.
This commit is contained in:
Nicholas J. Kain 2011-07-02 01:51:32 -04:00
parent 17570e9a38
commit 7104b56ab9
1 changed files with 20 additions and 14 deletions
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42
ndhc/netlink.c
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@ -72,9 +72,9 @@ int nl_open(struct client_state_t *cs)
return -1;
}
static void takedown_if(struct client_state_t *cs)
static void restart_if(struct client_state_t *cs)
{
log_line("nl: taking down interface");
log_line("nl: %s back, querying for new lease", client_config.interface);
// XXX: Same as packet.c - merge somehow?
ifchange(NULL, IFCHANGE_DECONFIG);
cs->dhcpState = DS_SELECTING;
@ -84,6 +84,14 @@ static void takedown_if(struct client_state_t *cs)
set_listen_raw(cs);
}
static void sleep_if(struct client_state_t *cs)
{
arp_close_fd(cs);
set_listen_none(cs);
cs->dhcpState = DS_RELEASED;
cs->timeout = -1;
}
static int data_attr_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
@ -135,8 +143,6 @@ static void get_if_index_and_mac(const struct nlmsghdr *nlh,
}
}
// XXX: Rather than exit, go into RELEASE state until a new hardware event
// forces wakeup.
static int data_cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[IFLA_MAX+1] = {0};
@ -149,7 +155,9 @@ static int data_cb(const struct nlmsghdr *nlh, void *data)
get_if_index_and_mac(nlh, ifm, (const struct nlattr **)tb);
if (ifm->ifi_index != client_config.ifindex)
break;
// IFF_UP corresponds to ifconfig down or ifconfig up.
if (ifm->ifi_flags & IFF_UP) {
// IFF_RUNNING is the hardware carrier.
if (ifm->ifi_flags & IFF_RUNNING) {
if (cs->ifsPrevState != IFS_UP) {
cs->ifsPrevState = IFS_UP;
@ -162,25 +170,23 @@ static int data_cb(const struct nlmsghdr *nlh, void *data)
else
log_line("nl: interface back, revalidating lease");
// If we don't have a lease, state -> SELECTING.
} else if (cs->dhcpState != DS_SELECTING) {
log_line("nl: interface back, querying for new lease");
takedown_if(cs);
}
}
} else {
if (cs->ifsPrevState != IFS_DOWN) {
// Interface was marked up but not running.
// Get a new lease from scratch.
cs->ifsPrevState = IFS_DOWN;
takedown_if(cs);
}
} else if (cs->dhcpState != DS_SELECTING)
restart_if(cs);
}
} else {
// No hardware carrier.
if (cs->ifsPrevState != IFS_DOWN) {
log_line("Interface carrier down. Going to sleep.");
cs->ifsPrevState = IFS_DOWN;
sleep_if(cs);
}
}
} else {
// User shut down the interface.
if (cs->ifsPrevState != IFS_SHUT) {
log_line("Interface shut down. Going to sleep.");
cs->ifsPrevState = IFS_SHUT;
log_line("Interface shut down; exiting.");
exit(EXIT_SUCCESS);
sleep_if(cs);
}
}
break;