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Restore the documentation about uid, gid or prison based rules requiring

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that debug.mpsafenet be set to 0. It is still possible for dead locks to
occur while these filtering options are used due to the layering violation
inherent in their implementation.

Discussed:	-current, rwatson, glebius
This commit is contained in:
Christian S.J. Peron 2005-10-23 16:15:02 +00:00
parent 180e996dfc
commit cd5f2f95b6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=151587
1 changed files with 10 additions and 0 deletions
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sbin/ipfw/ipfw.8
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@ -1074,10 +1074,14 @@ Matches all TCP or UDP packets sent by or received for a
A
.Ar group
may be specified by name or number.
This option should be used only if debug.mpsafenet=0 to avoid possible
deadlocks due to layering violations in its implementation.
.It Cm jail Ar prisonID
Matches all TCP or UDP packets sent by or received for the
jail whos prison ID is
.Ar prisonID .
This option should be used only if debug.mpsafenet=0 to avoid possible
deadlocks due to layering violations in its implementation.
.It Cm icmptypes Ar types
Matches ICMP packets whose ICMP type is in the list
.Ar types .
@ -1413,6 +1417,8 @@ Match all TCP or UDP packets sent by or received for a
A
.Ar user
may be matched by name or identification number.
This option should be used only if debug.mpsafenet=0 to avoid possible
deadlocks due to layering violations in its implementation.
.It Cm verrevpath
For incoming packets,
a routing table lookup is done on the packet's source address.
@ -2517,3 +2523,7 @@ to a TCP connection, and the uid/gid associated with a packet may not
be as expected if the associated process calls
.Xr setuid 2
or similar system calls.
.Pp
Rules which use uid, gid or jail based matching should be used only
if debug.mpsafenet=0 to avoid possible deadlocks due to layering
violations in its implementation.