lib/vserver-internal.h

   1 // $Id: vserver-internal.h 2589 2007-08-16 03:06:50Z dhozac $    --*- c++ -*--
   2
   3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; version 2 of the License.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with this program; if not, write to the Free Software
  16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 #ifdef H_VSERVER_SYSCALL_INTERNAL_H
  19 #  error vserver-internal.h must not be included more than once
  20 #endif
  21
  22 #ifndef H_VSERVER_SYSCALL_INTERNAL_H
  23 #define H_VSERVER_SYSCALL_INTERNAL_H
  24
  25 #include <asm/unistd.h>
  26 #include <errno.h>
  27 #include <stdint.h>
  28 #include <unistd.h>
  29
  30 #include "internal.h"
  31 #include "syscall-wrap.h"
  32
  33 #if !defined(__NR_vserver) && defined(ENSC_SYSCALL__NR_vserver)
  34 #  define __NR_vserver  ENSC_SYSCALL__NR_vserver
  35 #endif
  36
  37 inline static ALWAYSINLINE void vc_noop0() {}
  38
  39 #define VC_PREFIX       0)
  40 #define VC_SUFFIX       else (void)(vc_noop0()
  41 #define CALL_VC_NOOP    vc_noop0()
  42 #define CALL_VC_GENERAL(ID, SUFFIX, FUNC, ...)                          \
  43   VC_PREFIX; VC_SELECT(ID) return FUNC ## _ ## SUFFIX(__VA_ARGS__); VC_SUFFIX
  44 #define CALL_VC_GENERAL_CONFIG(BIT, SUFFIX, FUNC, ...)                  \
  45   VC_PREFIX; VC_CBIT(BIT)  return FUNC ## _ ## SUFFIX(__VA_ARGS__); VC_SUFFIX
  46
  47 #ifdef VC_MULTIVERSION_SYSCALL
  48 #  define VC_SELECT(ID) if (ver>=(ID))
  49 #  define VC_CBIT(BIT)  if ((conf&BIT) == BIT)
  50 #  define CALL_VC(...)                                  \
  51   do {                                                  \
  52     int ver = utilvserver_checkCompatVersion();         \
  53     vc_vci_t UNUSED conf = utilvserver_checkCompatConfig();     \
  54     if (ver==-1) return -1;                             \
  55     VC_SUFFIX, __VA_ARGS__, VC_PREFIX;                  \
  56     errno = ENOSYS;                                     \
  57     return -1;                                          \
  58   } while (0)
  59 #else
  60 #  define VC_SELECT(ID) if (1)
  61 #  define VC_CBIT(BIT)  if (1)
  62 #  define CALL_VC(...)                                  \
  63   do {                                                  \
  64     if (1) {} VC_SUFFIX, __VA_ARGS__, VC_PREFIX;        \
  65     errno = ENOSYS; return -1;                          \
  66   } while (0)
  67 #endif
  68
  69 #ifdef VC_ENABLE_API_COMPAT
  70 #  define CALL_VC_COMPAT(F,...) CALL_VC_GENERAL(0x00010000, compat, F, __VA_ARGS__)
  71 #else
  72 #  define CALL_VC_COMPAT(F,...) CALL_VC_NOOP
  73 #endif
  74
  75 #ifdef VC_ENABLE_API_LEGACY
  76 #  define CALL_VC_LEGACY(F,...) CALL_VC_GENERAL(0x00000000, legacy, F, __VA_ARGS__)
  77 #else
  78 #  define CALL_VC_LEGACY(F,...) CALL_VC_NOOP
  79 #endif
  80
  81 #ifdef VC_ENABLE_API_V11
  82 #  define CALL_VC_V11(F,...)    CALL_VC_GENERAL(0x00010000, v11, F, __VA_ARGS__)
  83 #else
  84 #  define CALL_VC_V11(F,...)    CALL_VC_NOOP
  85 #endif
  86
  87 #ifdef VC_ENABLE_API_V13
  88 #  define CALL_VC_V13(F,...)    CALL_VC_GENERAL(0x00010011, v13, F, __VA_ARGS__)
  89 #else
  90 #  define CALL_VC_V13(F,...)    CALL_VC_NOOP
  91 #endif
  92
  93 #ifdef VC_ENABLE_API_V13
  94 #  define CALL_VC_V13A(F,...)   CALL_VC_GENERAL(0x00010012, v13, F, __VA_ARGS__)
  95 #else
  96 #  define CALL_VC_V13A(F,...)   CALL_VC_NOOP
  97 #endif
  98
  99 #ifdef VC_ENABLE_API_V13
 100 #  define CALL_VC_V13B(F,...)   CALL_VC_GENERAL(0x00010021, v13b, F, __VA_ARGS__)
 101 #else
 102 #  define CALL_VC_V13B(F,...)   CALL_VC_NOOP
 103 #endif
 104
 105 #ifdef VC_ENABLE_API_V13OBS
 106 #  define CALL_VC_V13OBS(F,...) CALL_VC_GENERAL(0x00010011, v13obs, F, __VA_ARGS__)
 107 #else
 108 #  define CALL_VC_V13OBS(F,...) CALL_VC_NOOP
 109 #endif
 110
 111 #ifdef VC_ENABLE_API_V21
 112 #  define CALL_VC_V21(F,...)    CALL_VC_GENERAL(0x00020100, v21, F, __VA_ARGS__)
 113 #else
 114 #  define CALL_VC_V21(F,...)    CALL_VC_NOOP
 115 #endif
 116
 117 #if defined(VC_ENABLE_API_V21) || defined(VC_ENABLE_API_V22) || defined(VC_ENABLE_API_V23)
 118 #  define CALL_VC_SPACES(F,...) CALL_VC_GENERAL_CONFIG(VC_VCI_SPACES, spaces, F, __VA_ARGS__)
 119 #else
 120 #  define CALL_VC_SPACES(F,...) CALL_VC_NOOP
 121 #endif
 122
 123 #if defined(VC_ENABLE_API_V23)
 124 #  define CALL_VC_TAG(F,...)    CALL_VC_GENERAL_CONFIG(VC_VCI_PPTAG, tag, F, __VA_ARGS__)
 125 #else
 126 #  define CALL_VC_TAG(F,...)    CALL_VC_NOOP
 127 #endif
 128
 129 #ifdef VC_ENABLE_API_V22
 130 #  define CALL_VC_V22(F,...)    CALL_VC_GENERAL(0x00020200, v22, F, __VA_ARGS__)
 131 #else
 132 #  define CALL_VC_V22(F,...)    CALL_VC_NOOP
 133 #endif
 134
 135 #ifdef VC_ENABLE_API_V23
 136 #  define CALL_VC_V23(F,...)    CALL_VC_GENERAL(0x00020300, v23, F, __VA_ARGS__)
 137 #else
 138 #  define CALL_VC_V23(F,...)    CALL_VC_NOOP
 139 #endif
 140
 141 #ifdef VC_ENABLE_API_NET
 142 #  define CALL_VC_NET(F,...)    CALL_VC_GENERAL(0x00010016, net, F, __VA_ARGS__)
 143 #else
 144 #  define CALL_VC_NET(F,...)    CALL_VC_NOOP
 145 #endif
 146
 147 #if defined(VC_ENABLE_API_NETV2)
 148 #  define CALL_VC_NETV2(F,...)  CALL_VC_GENERAL_CONFIG(VC_VCI_NETV2, netv2, F, __VA_ARGS__)
 149 #else
 150 #  define CALL_VC_NETV2(F,...)  CALL_VC_NOOP
 151 #endif
 152
 153 #ifdef VC_ENABLE_API_FSCOMPAT
 154 #  define CALL_VC_FSCOMPAT(F,...)       CALL_VC_GENERAL(0x00010000, fscompat, F, __VA_ARGS__)
 155 #else
 156 #  define CALL_VC_FSCOMPAT(F,...)       CALL_VC_NOOP
 157 #endif
 158
 159 #ifdef VC_ENABLE_API_OLDPROC
 160 #  define CALL_VC_OLDPROC(F,...)        CALL_VC_GENERAL(0x00000000, oldproc, F, __VA_ARGS__)
 161 #else
 162 #  define CALL_VC_OLDPROC(F,...)        CALL_VC_NOOP
 163 #endif
 164
 165 #ifdef VC_ENABLE_API_OLDUTS
 166 #  define CALL_VC_OLDUTS(F,...)         CALL_VC_GENERAL(0x00000000, olduts, F, __VA_ARGS__)
 167 #else
 168 #  define CALL_VC_OLDUTS(F,...)         CALL_VC_NOOP
 169 #endif
 170
 171
 172   // Some  kernel <-> userspace wrappers; they should be noops in most cases
 173
 174 #if 1
 175 #  define CTX_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NOCTX   : \
 176                                  ((X)==(uint32_t)(-2)) ? VC_SAMECTX : \
 177                                  (xid_t)(X))
 178
 179 #  define CTX_USER2KERNEL(X)    (((X)==VC_DYNAMIC_XID) ? (uint32_t)(-1) : \
 180                                  ((X)==VC_SAMECTX)     ? (uint32_t)(-2) : \
 181                                  (uint32_t)(X))
 182 #else
 183 #  define CTX_USER2KERNEL(X)    (X)
 184 #  define CTX_KERNEL2USER(X)    (X)
 185 #endif
 186
 187 #if 1
 188 #  define TAG_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NOCTX   : \
 189                                  ((X)==(uint32_t)(-2)) ? VC_SAMECTX : \
 190                                  (tag_t)(X))
 191
 192 #  define TAG_USER2KERNEL(X)    (((X)==VC_DYNAMIC_XID) ? (uint32_t)(-1) : \
 193                                  ((X)==VC_SAMECTX)     ? (uint32_t)(-2) : \
 194                                  (uint32_t)(X))
 195 #else
 196 #  define TAG_USER2KERNEL(X)    (X)
 197 #  define TAG_KERNEL2USER(X)    (X)
 198 #endif
 199
 200 #if 1
 201 #  define EXT2FLAGS_USER2KERNEL(X)      (((X) & ~(VC_IMMUTABLE_FILE_FL|VC_IMMUTABLE_LINK_FL)) | \
 202                                          ((X) & VC_IMMUTABLE_FILE_FL ? EXT2_IMMUTABLE_FILE_FL : 0) | \
 203                                          ((X) & VC_IMMUTABLE_LINK_FL ? EXT2_IMMUTABLE_LINK_FL : 0))
 204 #  define EXT2FLAGS_KERNEL2USER(X)      (((X) & ~(EXT2_IMMUTABLE_FILE_FL|EXT2_IMMUTABLE_LINK_FL)) | \
 205                                          ((X) & EXT2_IMMUTABLE_FILE_FL ? VC_IMMUTABLE_FILE_FL : 0) | \
 206                                          ((X) & EXT2_IMMUTABLE_LINK_FL ? VC_IMMUTABLE_LINK_FL : 0))
 207 #else
 208 #  define EXT2FLAGS_KERNEL2USER(X)      (X)
 209 #  define EXT2FLAGS_USER2KERNEL(X)      (X)
 210 #endif
 211
 212 #if 1
 213 #  define VHI_USER2KERNEL(X)            ((((X)==vcVHI_CONTEXT)    ? VHIN_CONTEXT    : \
 214                                           ((X)==vcVHI_SYSNAME)    ? VHIN_SYSNAME    : \
 215                                           ((X)==vcVHI_NODENAME)   ? VHIN_NODENAME   : \
 216                                           ((X)==vcVHI_RELEASE)    ? VHIN_RELEASE    : \
 217                                           ((X)==vcVHI_VERSION)    ? VHIN_VERSION    : \
 218                                           ((X)==vcVHI_MACHINE)    ? VHIN_MACHINE    : \
 219                                           ((X)==vcVHI_DOMAINNAME) ? VHIN_DOMAINNAME : \
 220                                           (X)))
 221 #  define VHI_KERNEL2USER(X)            ((((X)==VHIN_CONTEXT)     ? vcVHI_CONTEXT    : \
 222                                           ((X)==VHIN_SYSNAME)     ? vcVHI_SYSNAME    : \
 223                                           ((X)==VHIN_NODENAME)    ? vcVHI_NODENAME   : \
 224                                           ((X)==VHIN_RELEASE)     ? vcVHI_RELEASE    : \
 225                                           ((X)==VHIN_VERSION)     ? vcVHI_VERSION    : \
 226                                           ((X)==VHIN_MACHINE)     ? vcVHI_MACHINE    : \
 227                                           ((X)==VHIN_DOMAINNAME)  ? vcVHI_DOMAINNAME : \
 228                                           (X)))
 229 #else
 230 #  define VHI_USER2KERNEL(X)            (X)
 231 #  define VHI_KERNEL2USER(X)            (X)
 232 #endif
 233
 234 #if 1
 235 #  define NID_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NONID   : \
 236                                  (xid_t)(X))
 237
 238 #  define NID_USER2KERNEL(X)    (((X)==VC_DYNAMIC_NID) ? (uint32_t)(-1) : \
 239                                  (uint32_t)(X))
 240 #else
 241 #  define NID_USER2KERNEL(X)    (X)
 242 #  define NID_KERNEL2USER(X)    (X)
 243 #endif
 244
 245 #define CDLIM_USER2KERNEL(X)            ((X)==VC_CDLIM_UNSET    ? CDLIM_UNSET    : \
 246                                          (X)==VC_CDLIM_INFINITY ? CDLIM_INFINITY : \
 247                                          (X)==VC_CDLIM_KEEP     ? CDLIM_KEEP     : \
 248                                          (X))
 249
 250   /// the __typeof__ thing is a hack to deal with the kernel interface
 251   /// using an unsigned long long value for a uint32_t type
 252 #define CDLIM_KERNEL2USER(X)            ((X)==(__typeof__(X))CDLIM_UNSET       ? VC_CDLIM_UNSET    : \
 253                                          (X)==(__typeof__(X))CDLIM_INFINITY    ? VC_CDLIM_INFINITY : \
 254                                          (X)==(__typeof__(X))CDLIM_KEEP        ? VC_CDLIM_KEEP     : \
 255                                          (X))
 256
 257
 258 #define ENSC_STRUCT_IDX(STRUCT,ATTR)                    \
 259   ((char*)(&(STRUCT).ATTR) - (char*)(&(STRUCT)))
 260 #define ENSC_SAME_STRUCT_IDX(LHS,RHS,ATTR)                      \
 261   (ENSC_STRUCT_IDX(LHS,ATTR) == ENSC_STRUCT_IDX(RHS,ATTR))
 262 #define ENSC_SAME_STRUCT_ITEM(LHS,RHS,ATTR)     \
 263   (ENSC_SAME_STRUCT_IDX(LHS,RHS,ATTR) &&        \
 264    sizeof((LHS).ATTR)==sizeof((RHS).ATTR) &&    \
 265    sizeof(LHS)==sizeof(RHS))
 266
 267 #define EXT2_IOC_GETCONTEXT             _IOR('x', 1, long)
 268 #define EXT2_IOC_SETCONTEXT             _IOW('x', 2, long)
 269
 270 #ifndef HAVE_VSERVER
 271 #ifdef ENSC_SYSCALL_TRADITIONAL
 272 inline static UNUSED ALWAYSINLINE
 273 int vserver(uint32_t cmd, uint32_t id, void *data)
 274 {
 275   return syscall(__NR_vserver, cmd, id, data);
 276 }
 277 #else
 278 inline static UNUSED ALWAYSINLINE
 279 _syscall3(int, vserver,
 280           uint32_t, cmd, uint32_t, id, void *, data)
 281 #endif
 282 #endif
 283
 284 #endif  //  H_VSERVER_SYSCALL_INTERNAL_H