// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SECCOMP_H_
#define SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SECCOMP_H_

#include <linux/filter.h>

// The Seccomp2 kernel ABI is not part of older versions of glibc.
// As we can't break compilation with these versions of the library,
// we explicitly define all missing symbols.
// If we ever decide that we can now rely on system headers, the following
// include files should be enabled:
// #include <linux/audit.h>
// #include <linux/seccomp.h>

// For audit.h
#ifndef EM_ARM
#define EM_ARM    40
#endif
#ifndef EM_386
#define EM_386    3
#endif
#ifndef EM_X86_64
#define EM_X86_64 62
#endif
#ifndef EM_MIPS
#define EM_MIPS   8
#endif
#ifndef EM_AARCH64
#define EM_AARCH64 183
#endif

#ifndef __AUDIT_ARCH_64BIT
#define __AUDIT_ARCH_64BIT 0x80000000
#endif
#ifndef __AUDIT_ARCH_LE
#define __AUDIT_ARCH_LE    0x40000000
#endif
#ifndef AUDIT_ARCH_ARM
#define AUDIT_ARCH_ARM    (EM_ARM|__AUDIT_ARCH_LE)
#endif
#ifndef AUDIT_ARCH_I386
#define AUDIT_ARCH_I386   (EM_386|__AUDIT_ARCH_LE)
#endif
#ifndef AUDIT_ARCH_X86_64
#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
#endif
#ifndef AUDIT_ARCH_MIPSEL
#define AUDIT_ARCH_MIPSEL (EM_MIPS|__AUDIT_ARCH_LE)
#endif
#ifndef AUDIT_ARCH_AARCH64
#define AUDIT_ARCH_AARCH64 (EM_AARCH64 | __AUDIT_ARCH_64BIT | __AUDIT_ARCH_LE)
#endif

// For prctl.h
#ifndef PR_SET_SECCOMP
#define PR_SET_SECCOMP               22
#define PR_GET_SECCOMP               21
#endif
#ifndef PR_SET_NO_NEW_PRIVS
#define PR_SET_NO_NEW_PRIVS          38
#define PR_GET_NO_NEW_PRIVS          39
#endif
#ifndef IPC_64
#define IPC_64                   0x0100
#endif

#ifndef BPF_MOD
#define BPF_MOD                    0x90
#endif
#ifndef BPF_XOR
#define BPF_XOR                    0xA0
#endif

// In order to build will older tool chains, we currently have to avoid
// including <linux/seccomp.h>. Until that can be fixed (if ever). Rely on
// our own definitions of the seccomp kernel ABI.
#ifndef SECCOMP_MODE_FILTER
#define SECCOMP_MODE_DISABLED         0
#define SECCOMP_MODE_STRICT           1
#define SECCOMP_MODE_FILTER           2  // User user-supplied filter
#endif

#ifndef SECCOMP_SET_MODE_STRICT
#define SECCOMP_SET_MODE_STRICT 0
#endif
#ifndef SECCOMP_SET_MODE_FILTER
#define SECCOMP_SET_MODE_FILTER 1
#endif
#ifndef SECCOMP_FILTER_FLAG_TSYNC
#define SECCOMP_FILTER_FLAG_TSYNC 1
#endif

#ifndef SECCOMP_RET_KILL
// Return values supported for BPF filter programs. Please note that the
// "illegal" SECCOMP_RET_INVALID is not supported by the kernel, should only
// ever be used internally, and would result in the kernel killing our process.
#define SECCOMP_RET_KILL    0x00000000U  // Kill the task immediately
#define SECCOMP_RET_INVALID 0x00010000U  // Illegal return value
#define SECCOMP_RET_TRAP    0x00030000U  // Disallow and force a SIGSYS
#define SECCOMP_RET_ERRNO   0x00050000U  // Returns an errno
#define SECCOMP_RET_TRACE   0x7ff00000U  // Pass to a tracer or disallow
#define SECCOMP_RET_ALLOW   0x7fff0000U  // Allow
#define SECCOMP_RET_ACTION  0xffff0000U  // Masks for the return value
#define SECCOMP_RET_DATA    0x0000ffffU  //   sections
#else
#define SECCOMP_RET_INVALID 0x00010000U  // Illegal return value
#endif

#ifndef SYS_SECCOMP
#define SYS_SECCOMP                   1
#endif

#endif  // SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SECCOMP_H_