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freebsd-dev/sys/compat/linux/linux_util.h
Alexander Leidinger 8ec6c4a38b - add more linux socket options (sorted by value) 
- map those IPv4 / IPv6 socket options which exist in FreeBSD
   + most of them visually verified to have the same type/layout of arguments
   + not tested with linux programs to behave as intended
 - be more human readable for known options which are not handled
 - be more verbose for unhandled socket message flags we know about
 - print the jail ID in linux_msg if run in a jail
 - add possibility to print debug message about known missing parts only once
 - add multiple levels of sysctl linux.debug:
   1: print debug messages, tell about unimplemented stuff (only once)
   2: like 1, but also print messages about implemented but not tested
      stuff (only once)
   3+: like 2, but no rate limiting of messages
 - increase default linux debug level from 1 to 3

We are a lot more verbose in as we need to be (e.g. some of the IP socket
options which are the same, and share the same memory layout, and are
believed to work). The reason is that we have no good testsuite to test those
linux-bits. The LTP or other test suites like the python one, are not fully
up to the task we need. As such the excessive messages about emulated but not
tested socket options.

IMO any MFC (possible, but most probably not by me) should set the default
debug level to 1.

Discussed with:	trasz
2020-11-08 09:50:58 +00:00

188 lines
6.2 KiB
C
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1994 Christos Zoulas
* Copyright (c) 1995 Frank van der Linden
* Copyright (c) 1995 Scott Bartram
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* from: svr4_util.h,v 1.5 1994/11/18 02:54:31 christos Exp
* from: linux_util.h,v 1.2 1995/03/05 23:23:50 fvdl Exp
* $FreeBSD$
*/
#ifndef _LINUX_UTIL_H_
#define _LINUX_UTIL_H_
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <sys/exec.h>
#include <sys/sysent.h>
#include <sys/syslog.h>
#include <sys/cdefs.h>
#include <sys/uio.h>
MALLOC_DECLARE(M_LINUX);
MALLOC_DECLARE(M_EPOLL);
MALLOC_DECLARE(M_FUTEX);
MALLOC_DECLARE(M_FUTEX_WP);
extern char linux_emul_path[];
extern int linux_use_emul_path;
int linux_emul_convpath(struct thread *, const char *, enum uio_seg, char **, int, int);
#define LUSECONVPATH(td) atomic_load_int(&linux_use_emul_path)
#define LCONVPATH_AT(td, upath, pathp, i, dfd) \
do { \
int _error; \
\
_error = linux_emul_convpath(td, upath, UIO_USERSPACE, \
pathp, i, dfd); \
if (*(pathp) == NULL) \
return (_error); \
} while (0)
#define LCONVPATH(td, upath, pathp, i) \
LCONVPATH_AT(td, upath, pathp, i, AT_FDCWD)
#define LCONVPATHEXIST(td, upath, pathp) LCONVPATH(td, upath, pathp, 0)
#define LCONVPATHEXIST_AT(td, upath, pathp, dfd) LCONVPATH_AT(td, upath, pathp, 0, dfd)
#define LCONVPATHCREAT(td, upath, pathp) LCONVPATH(td, upath, pathp, 1)
#define LCONVPATHCREAT_AT(td, upath, pathp, dfd) LCONVPATH_AT(td, upath, pathp, 1, dfd)
#define LFREEPATH(path) free(path, M_TEMP)
#define DUMMY(s) \
LIN_SDT_PROBE_DEFINE0(dummy, s, entry); \
LIN_SDT_PROBE_DEFINE0(dummy, s, not_implemented); \
LIN_SDT_PROBE_DEFINE1(dummy, s, return, "int"); \
int \
linux_ ## s(struct thread *td, struct linux_ ## s ## _args *args) \
{ \
static pid_t pid; \
\
LIN_SDT_PROBE0(dummy, s, entry); \
\
if (pid != td->td_proc->p_pid) { \
linux_msg(td, "syscall %s not implemented", #s); \
LIN_SDT_PROBE0(dummy, s, not_implemented); \
pid = td->td_proc->p_pid; \
}; \
\
LIN_SDT_PROBE1(dummy, s, return, ENOSYS); \
return (ENOSYS); \
} \
struct __hack
/*
* This is for the syscalls that are not even yet implemented in Linux.
*
* They're marked as UNIMPL in syscall.master so it will
* have nosys record in linux_sysent[].
*/
#define UNIMPLEMENTED(s)
void linux_msg(const struct thread *td, const char *fmt, ...)
__printflike(2, 3);
struct linux_device_handler {
char *bsd_driver_name;
char *linux_driver_name;
char *bsd_device_name;
char *linux_device_name;
int linux_major;
int linux_minor;
int linux_char_device;
};
int linux_device_register_handler(struct linux_device_handler *h);
int linux_device_unregister_handler(struct linux_device_handler *h);
char *linux_driver_get_name_dev(device_t dev);
int linux_driver_get_major_minor(const char *node, int *major, int *minor);
int linux_vn_get_major_minor(const struct vnode *vn, int *major, int *minor);
char *linux_get_char_devices(void);
void linux_free_get_char_devices(char *string);
#if defined(KTR)
#define KTR_LINUX KTR_SUBSYS
#define LINUX_CTRFMT(nm, fmt) #nm"("fmt")"
#define LINUX_CTR6(f, m, p1, p2, p3, p4, p5, p6) do { \
CTR6(KTR_LINUX, LINUX_CTRFMT(f, m), \
p1, p2, p3, p4, p5, p6); \
} while (0)
#define LINUX_CTR(f) LINUX_CTR6(f, "", 0, 0, 0, 0, 0, 0)
#define LINUX_CTR0(f, m) LINUX_CTR6(f, m, 0, 0, 0, 0, 0, 0)
#define LINUX_CTR1(f, m, p1) LINUX_CTR6(f, m, p1, 0, 0, 0, 0, 0)
#define LINUX_CTR2(f, m, p1, p2) LINUX_CTR6(f, m, p1, p2, 0, 0, 0, 0)
#define LINUX_CTR3(f, m, p1, p2, p3) LINUX_CTR6(f, m, p1, p2, p3, 0, 0, 0)
#define LINUX_CTR4(f, m, p1, p2, p3, p4) LINUX_CTR6(f, m, p1, p2, p3, p4, 0, 0)
#define LINUX_CTR5(f, m, p1, p2, p3, p4, p5) LINUX_CTR6(f, m, p1, p2, p3, p4, p5, 0)
#else
#define LINUX_CTR(f)
#define LINUX_CTR0(f, m)
#define LINUX_CTR1(f, m, p1)
#define LINUX_CTR2(f, m, p1, p2)
#define LINUX_CTR3(f, m, p1, p2, p3)
#define LINUX_CTR4(f, m, p1, p2, p3, p4)
#define LINUX_CTR5(f, m, p1, p2, p3, p4, p5)
#define LINUX_CTR6(f, m, p1, p2, p3, p4, p5, p6)
#endif
/*
* Some macros for rate limiting messages:
* - noisy if compat.linux.debug = 1
* - print only once if compat.linux.debug > 1
*/
#define LINUX_RATELIMIT_MSG_NOTTESTED(_what) \
do { \
static int seen = 0; \
\
if (seen == 0 && linux_debug >= 2) { \
linux_msg(curthread, "%s is not tested, please report on emulation@FreeBSD.org how it works", _what); \
\
if (linux_debug < 3) \
seen = 1; \
} \
} while (0)
#define LINUX_RATELIMIT_MSG_OPT1(_message, _opt1) \
do { \
static int seen = 0; \
\
if (seen == 0) { \
linux_msg(curthread, _message, _opt1); \
\
if (linux_debug < 3) \
seen = 1; \
} \
} while (0)
#endif /* ! _LINUX_UTIL_H_ */
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