To all;
Previously running Linux kernel 2.6.14.3:
In addrconf.c, in the function "ipv6_add_dev",(see below in bold).
"dev->ip6_ptr = ndev" is set, then "ipv6_mc_init_dev(ndev)" is called
(mcast.c), which then calls "ipv6_dev_mc_inc" (mcast.c) for the "all
nodes address".
This sets "idev = in6_dev_get(dev)" and then tests if it is NULL.
2.6.14.3 code:
static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
{
struct inet6_dev *ndev;
~~~~
~~~
write_lock_bh(&addrconf_lock);
dev->ip6_ptr = ndev;
write_unlock_bh(&addrconf_lock);
ipv6_mc_init_dev(ndev);
ndev->tstamp = jiffies;
#ifdef CONFIG_SYSCTL
neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
NET_IPV6_NEIGH, "ipv6",
&ndisc_ifinfo_sysctl_change,
NULL);
addrconf_sysctl_register(ndev, &ndev->cnf);
#endif
}
return ndev;
}
"Idev is not NULL, so the all nodes address (FF02::1) is added to the
list and all is fine.
************************************************************************
*****************
Now in the 2.6.19.2 linux kernel, the "ipv6_add_dev" routine has
changed(see below). "dev->ip6_ptr = ndev" is no longer in the code.
"ipv6_mc_init_dev(ndev)" is called and then a new function
"rcu_assign_pointer(dev->ip6_ptr, ndev)" is used.
When this occurs, the call to "ipv6_dev_mc_inc" (in mcast.c) will set
"idev = in6_dev_get(dev)" and then test if it is NULL.
It is NULL, so it returns -EINVAL.
2.6.19.2 code:
static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
{
struct inet6_dev *ndev;
~~~~
~~~~
if (netif_carrier_ok(dev))
ndev->if_flags |= IF_READY;
ipv6_mc_init_dev(ndev);
ndev->tstamp = jiffies;
#ifdef CONFIG_SYSCTL
neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
NET_IPV6_NEIGH, "ipv6",
&ndisc_ifinfo_sysctl_change,
NULL);
addrconf_sysctl_register(ndev, &ndev->cnf);
#endif
/* protected by rtnl_lock */
rcu_assign_pointer(dev->ip6_ptr, ndev);
return ndev;
}
The all nodes address (FF02::1) is never added to the list.
I have worked around the problem by moving the
"rcu_assign_pointer(dev->ip6_ptr, ndev)" before the call to
"ipv6_mc_init_dev(ndev)".
Has anyone else seen this issue?
Thanks,
Phil Bellino
============================
Phil Bellino
MRV Communications, Inc.
Boston Product Division
295 Foster St.
Littleton,MA 01460
Tel: (978)952-4807
Email: [EMAIL PROTECTED]
============================
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