Hi all,
I have a question on the struct inet_protocol error handler. I am referring to
a 2.2.x kenrel.
Let's say I want to make a "traceroute call" from a transport layer protocol
(say XYP, with protocol number 177) routine. So, an ICMP with TIME_EXCEED
returns. Below is how I think the routine call works:
ip_rcv() -> ip_local_deliver() -> icmp_rcv() -> icmp_unreach() -> 'a protocol
with the matched protocol #'->errhandler()
However, the below statement in icmp_unreach() is never satisfied since I
guess that skb->nh.iph->protocol always equals 0x01 (ICMP) but not 177:
if(iph->protocol == ipprot->protocol && ipprot->err_handler)
ipprot->err_handler(skb, dp, len);
The error handler never goes into my xyp_err().
Is my description clear? I surely have missed out something but I have no
clue. Can my xyp_err() ever be called? Could anyone help me? Thanks in
advance.
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