From owner-freebsd-hackers  Thu Jul 19 15:34:17 2001
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From: Terry Lambert <tlambert@primenet.com>
Message-Id: <200107192241.PAA14287@usr05.primenet.com>
Subject: Re: inpcb question
To: sridharv@ufl.edu
Date: Thu, 19 Jul 2001 22:41:10 +0000 (GMT)
Cc: freebsd-hackers@freebsd.org
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] I have written a kernel module and modified the stack 
] code ( at the socket layer) to send control to my 
] module. I am trying to access the inpcb structure 
] associated with that particular socket. 
] struct in_pcb* inp = sotoinpcb(so);
] if (inp)
]    .... processing
] 
] 
] though the pbc structure is allocated i am getting a 
] page fault everytime when i try to  access it. 
] any idea? my code is in the socket layer..i checked up 
] the udp routines.. they do pretty much the same thing..
] any help?

It may be that the packets you are processing are not IP
packets, and therefore do not have an in_pcb in them.

Verify that they are IP packets first, e.g.:

	if (so->so_proto->pr_domain->dom_family == PF_INET) {
		struct in_pcb* inp = sotoinpcb(so);
		if (inp) {
			... processing ...
		}
	}

Pretty obvious in retrospect, eh?

-- Terry

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