Re: [ofa-general] [PATCH] IB/IPoIB: Don't let a bad muticast address in the join list stop subsequent joins

[Moni Shoua]

>> Is there any way userspace can inject a bogus multicast address?
> 
> Can you do it with netlink?
> 
> ip maddr add address ... dev ib0  
> 
> Jason

Thanks Jason. This is an example that shows it can be done from userspace.
Roland, I think that the output below answers your question.


Before ip maddr show
-------------------------------
linux:/etc/sysconfig/network # ip m s dev ib0
9:      ib0
        link  00:ff:ff:ff:ff:12:60:1b:ff:ff:00:00:00:00:00:01:00:00:00:00
        link  00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:00:00:00:00
        link  00:ff:ff:ff:ff:12:60:1b:ff:ff:00:00:00:00:00:00:00:00:00:00
        inet  224.0.0.1
        inet6 ff02::1:ff96:ca05
        inet6 ff02::1

linux:/etc/sysconfig/network # ip maddr add 33:33:00:00:00:01 dev ib0
linux:/etc/sysconfig/network # ip m s dev ib0

Before ip maddr show
-------------------------------
9:      ib0
        link  33:33:00:00:00:01:00:00:00:00:00:00:00:00:00:00:00:00:00:00 static
        link  00:ff:ff:ff:ff:12:60:1b:ff:ff:00:00:00:00:00:01:00:00:00:00
        link  00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:00:00:00:00
        link  00:ff:ff:ff:ff:12:60:1b:ff:ff:00:00:00:00:00:00:00:00:00:00
        inet  224.0.0.1
        inet6 ff02::1:ff96:ca05
        inet6 ff02::1

>From dmesg (22 means EINVAL)
-------------------------------
ib0: multicast join failed for 0001:0000:0000:0000:0000:0000:0000:0000, status 
-22
ib0: multicast join failed for 0001:0000:0000:0000:0000:0000:0000:0000, status 
-22
ib0: multicast join failed for 0001:0000:0000:0000:0000:0000:0000:0000, status 
-22
ib0: multicast join failed for 0001:0000:0000:0000:0000:0000:0000:0000, status 
-22
ib0: multicast join failed for 0001:0000:0000:0000:0000:0000:0000:0000, status 
-22
ib0: multicast join failed for 0001:0000:0000:0000:0000:0000:0000:0000, status 
-22
ib0: multicast join failed for 0001:0000:0000:0000:0000:0000:0000:0000, status 
-22
ib0: multicast join failed for 0001:0000:0000:0000:0000:0000:0000:0000, status 
-22
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