bpfjit(4) - NetBSD Manual Pages

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BPFJIT(4)               NetBSD Kernel Interfaces Manual              BPFJIT(4)


NAME

     bpfjit -- Just-In-Time compiler for Berkeley Packet Filter


SYNOPSIS

     options BPFJIT
     options SLJIT


DESCRIPTION

     The bpfjit kernel interface adds Just-In-Time compilation of filter pro-
     grams sent to a bpf(4) device.  Instead of being interpreted for every
     packet, these filter programs are compiled into native code and the code
     is being executed for every packet.

     The implementation of bpfjit is based on the Stack-Less Just-In-Time
     library, or sljit for short.  The library supports multiple platforms
     including
           ·   AMD-x86 64
           ·   ARM 32 (ARM-v5, ARM-v7 and Thumb2 instruction sets)
           ·   Intel-x86 32
           ·   MIPS 32 (III, R1)
           ·   MIPS 64 (III, R1)
           ·   PowerPC 32
           ·   PowerPC 64
           ·   SPARC 32

     bpfjit supports all architectures listed above.

     bpfjit is also available as a module in modular kernels.


SYSCTLS

     The following sysctl is available when bpfjit is enabled:

     net.bpf.jit     Toggle Just-In-Time compilation of new filter programs.
                     Changing a value of this sysctl doesn't affect existing
                     filter programs.


SEE ALSO

     bpf(4), modload(8)

     sljit:
           http://sljit.sourceforge.net/ library


HISTORY

     The bpfjit interface first appeared in NetBSD 7.0.


AUTHORS

     The bpfjit code was written by Alexander Nasonov <alnsn@NetBSD.org>.

     The sljit library was written by
     Zoltan Herczeg <hzmester@freemail.hu>.

NetBSD 8.2                       July 24, 2014                      NetBSD 8.2