kern/127528: [icmp]: icmp socket receives icmp replies not owned by the process.

[Bruce M. Simpson]

The following reply was made to PR kern/127528; it has been noted by GNATS.

From: "Bruce M. Simpson" <bms at FreeBSD.org>
To: remko at FreeBSD.org
Cc: freebsd-net at FreeBSD.org, freebsd-bugs at FreeBSD.org
Subject: Re: kern/127528: [icmp]: icmp socket receives icmp replies not	owned
 by the process.
Date: Sun, 21 Sep 2008 23:12:30 +0100

 remko at FreeBSD.org wrote:
 > Old Synopsis: icmp socket receives icmp replies not owned by the process.
 > New Synopsis: [icmp]: icmp socket receives icmp replies not owned by the process.
 >   
 
 This PR is bogus because:
 ICMP has no concept of datagrams being "owned" by a process. There is no 
 field in the ICMP protocol which differentiates ICMP "sessions" on a 
 per-process basis, and this is because ICMP has no concept of "sessions" 
 -- ICMP messages are directed at IP endpoints.
 
 The networking stack will only selectively dispatch ICMP traffic based 
 on two conditions:
  1. ip_proto number (raw sockets may selectively bind to a protocol) and
  2. multicast group membership (not applicable in this instance).
 
  > It also shows that both echo requests have different identifiers in 
 the id field which should keep the icmp streams seperated.
 
 There is absolutely no requirement for the kernel code to look at the ID 
 field, beyond reporting it to consumers of the SOCK_RAW interface.
 
 This PR can be closed, the submitter should consult the pfSense maintainers.
 
 thanks
 BMS
 
 
 
 
 
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