Arthur Fabre 49bb7cea24 bpf: support JumpIf on RegX instead of K ...

Add a JumpIfX instruction which implements conditional jumps using
RegA and RegX. This is in addition to the pre-existing JumpIf
instruction which uses RegA and K.

This instruction / addressing mode is not mentionned in the original BPF
paper, but is supported by tools like bpf_asm, and has recently been
added to the kernel's filter.txt.

Simplify some of the parsing logic, and add a separate helper for
checking for "fake" JumpIfs.

Add JumpIfX support to the BPF vm.

Update testdata with JumpIfX instructions, and add tests
for both the assembler/disassembler and vm.

Fixes golang/go#27814

Change-Id: I0c3f6ac7eb5b4cd4d9c5af8784ee2e8d25195a0a
GitHub-Last-Rev: 39a88165b2
GitHub-Pull-Request: golang/net#20
Reviewed-on: https://go-review.googlesource.com/c/136895
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

2018-10-11 14:41:30 +00:00

..

testdata

bpf: support JumpIf on RegX instead of K

2018-10-11 14:41:30 +00:00

asm.go

bpf: new package to assemble and disassemble Berkeley Packet Filter programs.

2016-03-28 06:22:12 +00:00

constants.go

bpf: support JumpIf on RegX instead of K

2018-10-11 14:41:30 +00:00

doc.go

bpf: add Go implementation of virtual machine

2016-06-18 00:31:17 +00:00

instructions_test.go

bpf: support JumpIf on RegX instead of K

2018-10-11 14:41:30 +00:00

instructions.go

bpf: support JumpIf on RegX instead of K

2018-10-11 14:41:30 +00:00

setter.go

bpf: add Setter interface

2017-06-13 04:21:24 +00:00

vm_aluop_test.go

bpf: add Go implementation of virtual machine

2016-06-18 00:31:17 +00:00

vm_bpf_test.go

Revert "ipv4, ipv6, internal/netreflect, bpf: fix the x/net build"

2017-05-24 08:43:35 +00:00

vm_extension_test.go

bpf: implement LoadExtension and ExtLen for VM

2016-06-20 21:42:44 +00:00

vm_instructions.go

bpf: support JumpIf on RegX instead of K

2018-10-11 14:41:30 +00:00

vm_jump_test.go

bpf: support JumpIf on RegX instead of K

2018-10-11 14:41:30 +00:00

vm_load_test.go

bpf: add Go implementation of virtual machine

2016-06-18 00:31:17 +00:00

vm_ret_test.go

bpf: add Go implementation of virtual machine

2016-06-18 00:31:17 +00:00

vm_scratch_test.go

bpf: add Go implementation of virtual machine

2016-06-18 00:31:17 +00:00

vm_test.go

bpf: fix a typo

2016-06-19 23:45:41 +00:00

vm.go

bpf: support JumpIf on RegX instead of K

2018-10-11 14:41:30 +00:00