Hi Patrick,
Thx for your prompt reply! Plz see some comments inline.
>>
>> Is this a bug in PF_PACKET? Should the socket queue be
>> emptied by packet_set_ring (called via setsockopt when
>> PACKET_RX_RING is used) so the above cannot happen?
>> Should the user-space app drain the socket queue with
>> recvfrom prior to (4) -quite unlikely in practice-?
> I guess the best way is not to bind the socket before having
> completed setup. We could still flush the queue to make life
> easier for userspace, not sure about that ..
Even w/o bind, packet_create is doing a dev_add_pack, which I think will make pkts arrive to that socket (ie. in netif_receive_skb one can see the loops over the rcu for both ptype_all and type-specific which seem match whenever !ptype->dev || ptype->dev==skb->dev).
Also the packet_mmap.txt doc does not mention bind, which probably is more a mechanism to closely specify a dev than to signal socket readiness.
Salu2,
J.
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