Hello,
In my transport protocol, like in others, there is one main receiving
routine called by IP when a packet arrives.
When I detect the packet is sort of 'SYN' packet and the socket is in
apropriate state, I would like to send the 'ACK' back to the client.
However, I am confused at this point, since sending this packet _from_ the
receiving routine will eventually trigger this very routine again - like
this /pseudocode/:
main_rcv(struct sk_buff *skb):
sk = lookup(packet_info)
if ( (sk->state = STATE_1) && (packet_info == state_1_packet) ) {
send_ack(sk);
return 0;
} else {
receive normally...
}
[...]
send_ack will trigger main_rcv when sending a packet.
My kernel panicks at some point after 'send_ack(sk);' and this situation
is difficult to debug, so before I'll start inserting printks everywhere --
is my procedure correct? Can I send acks from receiving routine?
('send_ack' works ok in other cases)
Thanks!
-marek
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