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[IPV6]: Defer IPv6 device initialization until a valid qdisc is specified

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To judge the timing for DAD, netif_carrier_ok() is used. However,
there is a possibility that dev->qdisc stays noop_qdisc even if
netif_carrier_ok() returns true. In that case, DAD NS is not sent out.
We need to defer the IPv6 device initialization until a valid qdisc
is specified.

Signed-off-by: Mitsuru Chinen <mitch@linux.vnet.ibm.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mitsuru Chinen 2007-10-10 02:53:43 -07:00 committed by David S. Miller
parent 9b77265235
commit f24e3d658c
1 changed files with 10 additions and 3 deletions
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13
net/ipv6/addrconf.c
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@ -74,6 +74,7 @@
#include <net/tcp.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/if_tunnel.h>
#include <linux/rtnetlink.h>
@ -213,6 +214,12 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
/* Check if a valid qdisc is available */
static inline int addrconf_qdisc_ok(struct net_device *dev)
{
return (dev->qdisc != &noop_qdisc);
}
static void addrconf_del_timer(struct inet6_ifaddr *ifp)
{
if (del_timer(&ifp->timer))
@ -384,7 +391,7 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
}
#endif
if (netif_running(dev) && netif_carrier_ok(dev))
if (netif_running(dev) && addrconf_qdisc_ok(dev))
ndev->if_flags |= IF_READY;
ipv6_mc_init_dev(ndev);
@ -2283,7 +2290,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
break;
if (event == NETDEV_UP) {
if (!netif_carrier_ok(dev)) {
if (!addrconf_qdisc_ok(dev)) {
/* device is not ready yet. */
printk(KERN_INFO
"ADDRCONF(NETDEV_UP): %s: "
@ -2295,7 +2302,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
if (idev)
idev->if_flags |= IF_READY;
} else {
if (!netif_carrier_ok(dev)) {
if (!addrconf_qdisc_ok(dev)) {
/* device is still not ready. */
break;
}