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ipv6: addrconf: fix /proc/net/if_inet6 

Commit 1d5783030a (ipv6/addrconf: speedup /proc/net/if_inet6 filling)
added bugs hiding some devices from if_inet6 and breaking applications.

"ip -6 addr" could still display all IPv6 addresses, while "ifconfig -a"
couldnt.

One way to reproduce the bug is by starting in a shell :

unshare -n /bin/bash
ifconfig lo up

And in original net namespace, lo device disappeared from if_inet6

Reported-by: Jan Hinnerk Stosch <janhinnerk.stosch@gmail.com>
Tested-by: Jan Hinnerk Stosch <janhinnerk.stosch@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Mihai Maruseac <mihai.maruseac@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-10-16 07:37:27 +00:00 committed by David S. Miller
parent 2384d6aa07
commit 9f0d3c2781
1 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
net/ipv6/addrconf.c
View File

@ -3064,14 +3064,15 @@ static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
struct hlist_node *n;
hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
addr_lst) {
if (!net_eq(dev_net(ifa->idev->dev), net))
continue;
/* sync with offset */
if (p < state->offset) {
p++;
continue;
}
state->offset++;
if (net_eq(dev_net(ifa->idev->dev), net))
return ifa;
return ifa;
}
/* prepare for next bucket */
@ -3089,18 +3090,20 @@ static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
struct hlist_node *n = &ifa->addr_lst;
hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
if (!net_eq(dev_net(ifa->idev->dev), net))
continue;
state->offset++;
if (net_eq(dev_net(ifa->idev->dev), net))
return ifa;
return ifa;
}
while (++state->bucket < IN6_ADDR_HSIZE) {
state->offset = 0;
hlist_for_each_entry_rcu_bh(ifa, n,
&inet6_addr_lst[state->bucket], addr_lst) {
if (!net_eq(dev_net(ifa->idev->dev), net))
continue;
state->offset++;
if (net_eq(dev_net(ifa->idev->dev), net))
return ifa;
return ifa;
}
}