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net/x25: handle call collisions

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If a session in X25_STATE_1 (Awaiting Call Accept) receives a call
request, the session will be closed (x25_disconnect), cause=0x01
(Number Busy) and diag=0x48 (Call Collision) will be set and a clear
request will be send.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin Schiller 2018-11-27 09:50:29 +01:00 committed by David S. Miller
parent 06137619f0
commit b020fcf6bb
1 changed files with 9 additions and 0 deletions
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9
net/x25/x25_in.c
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@ -142,6 +142,15 @@ static int x25_state1_machine(struct sock *sk, struct sk_buff *skb, int frametyp
sk->sk_state_change(sk);
break;
}
case X25_CALL_REQUEST:
/* call collision */
x25->causediag.cause = 0x01;
x25->causediag.diagnostic = 0x48;
x25_write_internal(sk, X25_CLEAR_REQUEST);
x25_disconnect(sk, EISCONN, 0x01, 0x48);
break;
case X25_CLEAR_REQUEST:
if (!pskb_may_pull(skb, X25_STD_MIN_LEN + 2))
goto out_clear;