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- Make BPF JIT compiler working again in userland. We are limiting size of

Browse Source 
generated native binary to page size for now.
- Update copyright date and fix some style nits.
This commit is contained in:
Jung-uk Kim 2009-11-18 19:26:17 +00:00
parent 9c9dad53b0
commit 366652f987
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=199492
6 changed files with 57 additions and 27 deletions
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35
sys/amd64/amd64/bpf_jit_machdep.c
View File

@ -1,6 +1,6 @@
/*-
* Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
* Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org>
* Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -42,6 +42,8 @@ __FBSDID("$FreeBSD$");
#include <net/if.h>
#else
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/param.h>
#endif
#include <sys/types.h>
@ -97,9 +99,9 @@ emit_code(bpf_bin_stream *stream, u_int value, u_int len)
bpf_filter_func
bpf_jit_compile(struct bpf_insn *prog, u_int nins, int *mem)
{
bpf_bin_stream stream;
struct bpf_insn *ins;
u_int i, pass;
bpf_bin_stream stream;
/*
* NOTE: do not modify the name of this variable, as it's used by
@ -475,20 +477,31 @@ bpf_jit_compile(struct bpf_insn *prog, u_int nins, int *mem)
}
pass++;
if (pass == 2)
if (pass >= 2) {
#ifndef _KERNEL
if (mprotect(stream.ibuf, stream.cur_ip,
PROT_READ | PROT_EXEC) != 0) {
munmap(stream.ibuf, BPF_JIT_MAXSIZE);
stream.ibuf = NULL;
}
#endif
break;
}
#ifdef _KERNEL
stream.ibuf = (char *)malloc(stream.cur_ip, M_BPFJIT, M_NOWAIT);
if (stream.ibuf == NULL) {
free(stream.refs, M_BPFJIT);
return (NULL);
}
if (stream.ibuf == NULL)
break;
#else
stream.ibuf = (char *)malloc(stream.cur_ip);
if (stream.ibuf == NULL) {
free(stream.refs);
return (NULL);
if (stream.cur_ip > BPF_JIT_MAXSIZE) {
stream.ibuf = NULL;
break;
}
stream.ibuf = (char *)mmap(NULL, BPF_JIT_MAXSIZE,
PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
if (stream.ibuf == MAP_FAILED) {
stream.ibuf = NULL;
break;
}
#endif

2
sys/amd64/amd64/bpf_jit_machdep.h
View File

@ -1,6 +1,6 @@
/*-
* Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
* Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org>
* Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without

35
sys/i386/i386/bpf_jit_machdep.c
View File

@ -1,6 +1,6 @@
/*-
* Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
* Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org>
* Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -42,6 +42,8 @@ __FBSDID("$FreeBSD$");
#include <net/if.h>
#else
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/param.h>
#endif
#include <sys/types.h>
@ -97,9 +99,9 @@ emit_code(bpf_bin_stream *stream, u_int value, u_int len)
bpf_filter_func
bpf_jit_compile(struct bpf_insn *prog, u_int nins, int *mem)
{
bpf_bin_stream stream;
struct bpf_insn *ins;
u_int i, pass;
bpf_bin_stream stream;
/*
* NOTE: do not modify the name of this variable, as it's used by
@ -498,20 +500,31 @@ bpf_jit_compile(struct bpf_insn *prog, u_int nins, int *mem)
}
pass++;
if (pass == 2)
if (pass >= 2) {
#ifndef _KERNEL
if (mprotect(stream.ibuf, stream.cur_ip,
PROT_READ | PROT_EXEC) != 0) {
munmap(stream.ibuf, BPF_JIT_MAXSIZE);
stream.ibuf = NULL;
}
#endif
break;
}
#ifdef _KERNEL
stream.ibuf = (char *)malloc(stream.cur_ip, M_BPFJIT, M_NOWAIT);
if (stream.ibuf == NULL) {
free(stream.refs, M_BPFJIT);
return (NULL);
}
if (stream.ibuf == NULL)
break;
#else
stream.ibuf = (char *)malloc(stream.cur_ip);
if (stream.ibuf == NULL) {
free(stream.refs);
return (NULL);
if (stream.cur_ip > BPF_JIT_MAXSIZE) {
stream.ibuf = NULL;
break;
}
stream.ibuf = (char *)mmap(NULL, BPF_JIT_MAXSIZE,
PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
if (stream.ibuf == MAP_FAILED) {
stream.ibuf = NULL;
break;
}
#endif

2
sys/i386/i386/bpf_jit_machdep.h
View File

@ -1,6 +1,6 @@
/*-
* Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
* Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org>
* Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without

6
sys/net/bpf_jitter.c
View File

@ -1,6 +1,6 @@
/*-
* Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
* Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org>
* Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -43,6 +43,8 @@ __FBSDID("$FreeBSD$");
#else
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/types.h>
#endif
@ -127,7 +129,7 @@ bpf_destroy_jit_filter(bpf_jit_filter *filter)
{
if (filter->func != bpf_jit_accept_all)
free(filter->func);
munmap(filter->func, BPF_JIT_MAXSIZE);
free(filter);
}
#endif

4
sys/net/bpf_jitter.h
View File

@ -1,6 +1,6 @@
/*-
* Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
* Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org>
* Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -36,6 +36,8 @@
#ifdef _KERNEL
MALLOC_DECLARE(M_BPFJIT);
#else
#define BPF_JIT_MAXSIZE PAGE_SIZE
#endif
extern int bpf_jitter_enable;