1.\" Copyright (c) 2008 Cisco Systems. All rights reserved. 2.\" Author: Julian Elischer 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Neither the name of the Cisco Systems nor the names of its employees 10.\" may be used to endorse or promote products derived from this software 11.\" without specific prior written permission. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd March 19, 2012 26.Dt SETFIB 2 27.Os 28.Sh NAME 29.Nm setfib 30.Nd set the default FIB (routing table) for the calling process 31.Sh LIBRARY 32.Lb libc 33.Sh SYNOPSIS 34.In sys/socket.h 35.Ft int 36.Fn setfib "int fib" 37.Sh DESCRIPTION 38The 39.Fn setfib 40system call sets the associated FIB (routing table) for all sockets opened 41subsequent to the call, to be that of the argument 42.Fa fib . 43The 44.Fa fib 45argument 46must be greater than or equal to 0 47and less than the current system maximum which 48may be retrieved by the 49.Va net.fibs 50sysctl. 51The system maximum is set in the kernel configuration file with 52.Bd -ragged -offset indent 53.Cd "options ROUTETABLES=" Ns Em N 54.Ed 55.Pp 56or in 57.Pa /boot/loader.conf 58with 59.Pp 60.Dl net.fibs= Ns Qq Em N 61.Pp 62where 63.Em N 64is an integer. 65This maximum is capped at 65536 due to the implementation storing 66the fib number in a 16-bit field in the 67.Xr mbuf 9 68packet header, however it is not suggested that one use such a large number 69as memory is allocated for every FIB regardless of whether it is used, and 70there are places where all FIBs are iterated over. 71.Pp 72The default FIB of the process will be applied to all protocol families 73that support multiple FIBs, and ignored by those that do not. 74The default FIB for a process may be overridden for a socket with the use 75of the 76.Dv SO_SETFIB 77socket option. 78.Sh RETURN VALUES 79.Rv -std setfib 80.Sh ERRORS 81The 82.Fn setfib 83system call 84will fail and no action will be taken and return 85.Er EINVAL 86if the 87.Fa fib 88argument is greater than the current system maximum. 89.Sh SEE ALSO 90.Xr setfib 1 , 91.Xr setsockopt 2 92.Sh STANDARDS 93The 94.Fn setfib 95system call is a 96.Fx 97extension however similar extensions 98have been added to many other 99.Ux 100style kernels. 101.Sh HISTORY 102The 103.Fn setfib 104function appeared in 105.Fx 7.1 . 106