lib/vserver-internal.h

   1 // $Id: vserver-internal.h,v 1.25 2005/05/02 21:42:37 ensc Exp $    --*- 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
  45 #ifdef VC_MULTIVERSION_SYSCALL
  46 #  define VC_SELECT(ID) if (ver>=(ID))
  47 #  define CALL_VC(...)                                  \
  48   do {                                                  \
  49     int ver = utilvserver_checkCompatVersion();         \
  50     if (ver==-1) return -1;                             \
  51     VC_SUFFIX, __VA_ARGS__, VC_PREFIX;                  \
  52     errno = ENOSYS;                                     \
  53     return -1;                                          \
  54   } while (0)
  55 #else
  56 #  define VC_SELECT(ID) if (1)
  57 #  define CALL_VC(...)                                  \
  58   do {                                                  \
  59     if (1) {} VC_SUFFIX, __VA_ARGS__, VC_PREFIX;        \
  60     errno = ENOSYS; return -1;                          \
  61   } while (0)
  62 #endif
  63
  64 #ifdef VC_ENABLE_API_COMPAT
  65 #  define CALL_VC_COMPAT(F,...) CALL_VC_GENERAL(0x00010000, compat, F, __VA_ARGS__)
  66 #else
  67 #  define CALL_VC_COMPAT(F,...) CALL_VC_NOOP
  68 #endif
  69
  70 #ifdef VC_ENABLE_API_LEGACY
  71 #  define CALL_VC_LEGACY(F,...) CALL_VC_GENERAL(0x00000000, legacy, F, __VA_ARGS__)
  72 #else
  73 #  define CALL_VC_LEGACY(F,...) CALL_VC_NOOP
  74 #endif
  75
  76 #ifdef VC_ENABLE_API_V11
  77 #  define CALL_VC_V11(F,...)    CALL_VC_GENERAL(0x00010000, v11, F, __VA_ARGS__)
  78 #else
  79 #  define CALL_VC_V11(F,...)    CALL_VC_NOOP
  80 #endif
  81
  82 #ifdef VC_ENABLE_API_V13
  83 #  define CALL_VC_V13(F,...)    CALL_VC_GENERAL(0x00010011, v13, F, __VA_ARGS__)
  84 #else
  85 #  define CALL_VC_V13(F,...)    CALL_VC_NOOP
  86 #endif
  87
  88 #ifdef VC_ENABLE_API_V13
  89 #  define CALL_VC_V13A(F,...)   CALL_VC_GENERAL(0x00010012, v13, F, __VA_ARGS__)
  90 #else
  91 #  define CALL_VC_V13A(F,...)   CALL_VC_NOOP
  92 #endif
  93
  94 #ifdef VC_ENABLE_API_V13
  95 #  define CALL_VC_V13B(F,...)   CALL_VC_GENERAL(0x00010021, v13b, F, __VA_ARGS__)
  96 #else
  97 #  define CALL_VC_V13B(F,...)   CALL_VC_NOOP
  98 #endif
  99
 100 #ifdef VC_ENABLE_API_V13
 101 #  define CALL_VC_V13OBS(F,...) CALL_VC_GENERAL(0x00010011, v13obs, F, __VA_ARGS__)
 102 #else
 103 #  define CALL_VC_V13OBS(F,...) CALL_VC_NOOP
 104 #endif
 105
 106
 107 #ifdef VC_ENABLE_API_NET
 108 #  define CALL_VC_NET(F,...)    CALL_VC_GENERAL(0x00010016, net, F, __VA_ARGS__)
 109 #else
 110 #  define CALL_VC_NET(F,...)    CALL_VC_NOOP
 111 #endif
 112
 113 #ifdef VC_ENABLE_API_FSCOMPAT
 114 #  define CALL_VC_FSCOMPAT(F,...)       CALL_VC_GENERAL(0x00010000, fscompat, F, __VA_ARGS__)
 115 #else
 116 #  define CALL_VC_FSCOMPAT(F,...)       CALL_VC_NOOP
 117 #endif
 118
 119 #ifdef VC_ENABLE_API_OLDPROC
 120 #  define CALL_VC_OLDPROC(F,...)        CALL_VC_GENERAL(0x00000000, oldproc, F, __VA_ARGS__)
 121 #else
 122 #  define CALL_VC_OLDPROC(F,...)        CALL_VC_NOOP
 123 #endif
 124
 125 #ifdef VC_ENABLE_API_OLDUTS
 126 #  define CALL_VC_OLDUTS(F,...)         CALL_VC_GENERAL(0x00000000, olduts, F, __VA_ARGS__)
 127 #else
 128 #  define CALL_VC_OLDUTS(F,...)         CALL_VC_NOOP
 129 #endif
 130
 131
 132   // Some  kernel <-> userspace wrappers; they should be noops in most cases
 133
 134 #if 1
 135 #  define CTX_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NOCTX   : \
 136                                  ((X)==(uint32_t)(-2)) ? VC_SAMECTX : \
 137                                  (xid_t)(X))
 138
 139 #  define CTX_USER2KERNEL(X)    (((X)==VC_DYNAMIC_XID) ? (uint32_t)(-1) : \
 140                                  ((X)==VC_SAMECTX)     ? (uint32_t)(-2) : \
 141                                  (uint32_t)(X))
 142 #else
 143 #  define CTX_USER2KERNEL(X)    (X)
 144 #  define CTX_KERNEL2USER(X)    (X)
 145 #endif
 146
 147 #if 1
 148 #  define EXT2FLAGS_USER2KERNEL(X)      (((X) & ~(VC_IMMUTABLE_FILE_FL|VC_IMMUTABLE_LINK_FL)) | \
 149                                          ((X) & VC_IMMUTABLE_FILE_FL ? EXT2_IMMUTABLE_FILE_FL : 0) | \
 150                                          ((X) & VC_IMMUTABLE_LINK_FL ? EXT2_IMMUTABLE_LINK_FL : 0))
 151 #  define EXT2FLAGS_KERNEL2USER(X)      (((X) & ~(EXT2_IMMUTABLE_FILE_FL|EXT2_IMMUTABLE_LINK_FL)) | \
 152                                          ((X) & EXT2_IMMUTABLE_FILE_FL ? VC_IMMUTABLE_FILE_FL : 0) | \
 153                                          ((X) & EXT2_IMMUTABLE_LINK_FL ? VC_IMMUTABLE_LINK_FL : 0))
 154 #else
 155 #  define EXT2FLAGS_KERNEL2USER(X)      (X)
 156 #  define EXT2FLAGS_USER2KERNEL(X)      (X)
 157 #endif
 158
 159 #if 1
 160 #  define VHI_USER2KERNEL(X)            ((((X)==vcVHI_CONTEXT)    ? VHIN_CONTEXT    : \
 161                                           ((X)==vcVHI_SYSNAME)    ? VHIN_SYSNAME    : \
 162                                           ((X)==vcVHI_NODENAME)   ? VHIN_NODENAME   : \
 163                                           ((X)==vcVHI_RELEASE)    ? VHIN_RELEASE    : \
 164                                           ((X)==vcVHI_VERSION)    ? VHIN_VERSION    : \
 165                                           ((X)==vcVHI_MACHINE)    ? VHIN_MACHINE    : \
 166                                           ((X)==vcVHI_DOMAINNAME) ? VHIN_DOMAINNAME : \
 167                                           (X)))
 168 #  define VHI_KERNEL2USER(X)            ((((X)==VHIN_CONTEXT)     ? vcVHI_CONTEXT    : \
 169                                           ((X)==VHIN_SYSNAME)     ? vcVHI_SYSNAME    : \
 170                                           ((X)==VHIN_NODENAME)    ? vcVHI_NODENAME   : \
 171                                           ((X)==VHIN_RELEASE)     ? vcVHI_RELEASE    : \
 172                                           ((X)==VHIN_VERSION)     ? vcVHI_VERSION    : \
 173                                           ((X)==VHIN_MACHINE)     ? vcVHI_MACHINE    : \
 174                                           ((X)==VHIN_DOMAINNAME)  ? vcVHI_DOMAINNAME : \
 175                                           (X)))
 176 #else
 177 #  define VHI_USER2KERNEL(X)            (X)
 178 #  define VHI_KERNEL2USER(X)            (X)
 179 #endif
 180
 181 #if 1
 182 #  define NID_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NONID   : \
 183                                  (xid_t)(X))
 184
 185 #  define NID_USER2KERNEL(X)    (((X)==VC_DYNAMIC_NID) ? (uint32_t)(-1) : \
 186                                  (uint32_t)(X))
 187 #else
 188 #  define NID_USER2KERNEL(X)    (X)
 189 #  define NID_KERNEL2USER(X)    (X)
 190 #endif
 191
 192 #if 1
 193 #  define NETTYPE_USER2KERNEL(X)        ((X)==vcNET_IPV4   ? 0 : \
 194                                          (X)==vcNET_IPV6   ? 1 : \
 195                                          (X)==vcNET_IPV4R  ? 2 : \
 196                                          (X)==vcNET_IPV6R  ? 3 : \
 197                                          (X))
 198 #  define NETTYPE_KERNEL2USER(X)        ((X)==0 ? vcNET_IPV4   ? : \
 199                                          (X)==1 ? vcNET_IPV6   ? : \
 200                                          (X)==2 ? vcNET_IPV4R  ? : \
 201                                          (X)==3 ? vcNET_IPV6R  ? : \
 202                                          (vc_net_nx_type)(X))
 203 #else
 204 #  define NETTYPE_USER2KERNEL(X)        (X)
 205 #  define NETTYPE_KERNEL2USER(X)        (X)
 206 #endif
 207
 208 #define CDLIM_USER2KERNEL(X)            ((X)==VC_CDLIM_UNSET    ? CDLIM_UNSET    : \
 209                                          (X)==VC_CDLIM_INFINITY ? CDLIM_INFINITY : \
 210                                          (X)==VC_CDLIM_KEEP     ? CDLIM_KEEP     : \
 211                                          (X))
 212
 213   /// the __typeof__ thing is a hack to deal with the kernel interface
 214   /// using an unsigned long long value for a uint32_t type
 215 #define CDLIM_KERNEL2USER(X)            ((X)==(__typeof__(X))CDLIM_UNSET       ? VC_CDLIM_UNSET    : \
 216                                          (X)==(__typeof__(X))CDLIM_INFINITY    ? VC_CDLIM_INFINITY : \
 217                                          (X)==(__typeof__(X))CDLIM_KEEP        ? VC_CDLIM_KEEP     : \
 218                                          (X))
 219
 220
 221 #define ENSC_STRUCT_IDX(STRUCT,ATTR)                    \
 222   ((char*)(&(STRUCT).ATTR) - (char*)(&(STRUCT)))
 223 #define ENSC_SAME_STRUCT_IDX(LHS,RHS,ATTR)                      \
 224   (ENSC_STRUCT_IDX(LHS,ATTR) == ENSC_STRUCT_IDX(RHS,ATTR))
 225 #define ENSC_SAME_STRUCT_ITEM(LHS,RHS,ATTR)     \
 226   (ENSC_SAME_STRUCT_IDX(LHS,RHS,ATTR) &&        \
 227    sizeof((LHS).ATTR)==sizeof((RHS).ATTR) &&    \
 228    sizeof(LHS)==sizeof(RHS))
 229
 230 #define EXT2_IOC_GETCONTEXT             _IOR('x', 1, long)
 231 #define EXT2_IOC_SETCONTEXT             _IOW('x', 2, long)
 232
 233 #ifndef HAVE_VSERVER
 234 #ifdef ENSC_SYSCALL_TRADITIONAL
 235 inline static UNUSED ALWAYSINLINE
 236 int vserver(uint32_t cmd, uint32_t id, void *data)
 237 {
 238 #if defined __dietlibc__
 239   extern long int syscall (long int __sysno, ...);
 240 #endif
 241
 242   return syscall(__NR_vserver, cmd, id, data);
 243 }
 244 #else
 245 inline static UNUSED ALWAYSINLINE
 246 _syscall3(int, vserver,
 247           uint32_t, cmd, uint32_t, id, void *, data)
 248 #endif
 249 #endif
 250
 251 #endif  //  H_VSERVER_SYSCALL_INTERNAL_H