On Thu, Aug 02, 2007 at 11:46:18PM +0100, David Woodhouse wrote:
> On Thu, 2007-08-02 at 18:30 -0400, Daniel Drake wrote:
> > This may be a stack-level issue. This is one of the issues holding back
> > zd1211rw-mac80211 going into mainline: we have a report that
> > zd1211rw-softmac works fine with IPv6 but mac80211 only works
> > occasionally with the same device on the same system.
> >
> > Does anyone have any ideas?
>
> It receives its own neighbour solicitation (multicast) packets when the
> AP sends them back out again. These packets...
>
> 23:41:56.046939 00:0a:95:f3:99:92 > 33:33:ff:f3:99:92, ethertype IPv6
> (0x86dd), length 78: :: > ff02::1:fff3:9992: ICMP6, neighbor
> solicitation, who has fe80::20a:95ff:fef3:9992, length 24
>
> You should be able to see this without _any_ IPv6 infrastructure -- and
> you'll see the link-local IPv6 address remains 'tentative'.
>
> Once you've fixed that, setting up a local route advertisement dæmon
> (radvd) to give you site-local addresses is fairly trivial too -- and
> then you can also check that Ethernet multicast is working properly.
I hacked-up the (untested) patch below -- thoughts?
---
From: John W. Linville <linville@xxxxxxxxxxxxx>
[PATCH] mac80211: filter locally-originated multicast frames
In STA mode, the AP will echo our traffic. This includes multicast
traffice.
Receiving these frames confuses some protocols and applications,
notably IPv6 Duplicate Address Detection.
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
---
net/mac80211/ieee80211.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index a42e70e..6dc6451 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -4263,11 +4263,14 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
rx.u.rx.ra_match = 0;
} else if (!multicast &&
compare_ether_addr(sdata->dev->dev_addr,
- hdr->addr1) != 0) {
+ hdr->addr1)) {
if (!sdata->promisc)
continue;
rx.u.rx.ra_match = 0;
- }
+ } else if (multicast &&
+ !compare_ether_addr(sdata->dev->dev_addr,
+ hdr->addr3))
+ rx.u.rx.ra_match = 0;
break;
case IEEE80211_IF_TYPE_IBSS:
if (!bssid)
--
John W. Linville
linville@xxxxxxxxxxxxx
-
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
