kernel/vserver/switch.c

   1 /*
   2  *  linux/kernel/vserver/switch.c
   3  *
   4  *  Virtual Server: Syscall Switch
   5  *
   6  *  Copyright (C) 2003-2005  Herbert Pötzl
   7  *
   8  *  V0.01  syscall switch
   9  *  V0.02  added signal to context
  10  *  V0.03  added rlimit functions
  11  *  V0.04  added iattr, task/xid functions
  12  *  V0.05  added debug/history stuff
  13  *  V0.06  added compat32 layer
  14  *
  15  */
  16
  17 #include <linux/linkage.h>
  18 #include <linux/sched.h>
  19 #include <linux/compat.h>
  20 #include <asm/errno.h>
  21
  22 #include <linux/vserver/network.h>
  23 #include <linux/vserver/switch.h>
  24 #include <linux/vserver/debug.h>
  25
  26
  27 static inline
  28 int vc_get_version(uint32_t id)
  29 {
  30 #ifdef  CONFIG_VSERVER_LEGACY_VERSION
  31         if (id == 63)
  32                 return VCI_LEGACY_VERSION;
  33 #endif
  34         return VCI_VERSION;
  35 }
  36
  37 #include <linux/vserver/context_cmd.h>
  38 #include <linux/vserver/cvirt_cmd.h>
  39 #include <linux/vserver/limit_cmd.h>
  40 #include <linux/vserver/network_cmd.h>
  41 #include <linux/vserver/sched_cmd.h>
  42 #include <linux/vserver/debug_cmd.h>
  43 #include <linux/vserver/inode_cmd.h>
  44 #include <linux/vserver/dlimit_cmd.h>
  45 #include <linux/vserver/signal_cmd.h>
  46 #include <linux/vserver/namespace_cmd.h>
  47
  48 #include <linux/vserver/legacy.h>
  49 #include <linux/vserver/inode.h>
  50 #include <linux/vserver/dlimit.h>
  51
  52
  53 #ifdef  CONFIG_COMPAT
  54 #define __COMPAT(name, id, data, compat)        \
  55         (compat) ? name ## _x32 (id, data) : name (id, data)
  56 #else
  57 #define __COMPAT(name, id, data, compat)        \
  58         name (id, data)
  59 #endif
  60
  61
  62 static inline
  63 long do_vserver(uint32_t cmd, uint32_t id, void __user *data, int compat)
  64 {
  65         vxdprintk(VXD_CBIT(switch, 0),
  66                 "vc: VCMD_%02d_%d[%d], %d,%p,%d",
  67                 VC_CATEGORY(cmd), VC_COMMAND(cmd),
  68                 VC_VERSION(cmd), id, data, compat);
  69
  70 #ifdef  CONFIG_VSERVER_LEGACY
  71         if (!capable(CAP_CONTEXT) &&
  72                 /* dirty hack for capremove */
  73                 !(cmd==VCMD_new_s_context && id==-2))
  74                 return -EPERM;
  75 #else
  76         if (!capable(CAP_CONTEXT))
  77                 return -EPERM;
  78 #endif
  79
  80         switch (cmd) {
  81         case VCMD_get_version:
  82                 return vc_get_version(id);
  83
  84         case VCMD_dump_history:
  85 #ifdef  CONFIG_VSERVER_HISTORY
  86                 return vc_dump_history(id);
  87 #else
  88                 return -ENOSYS;
  89 #endif
  90
  91 #ifdef  CONFIG_VSERVER_LEGACY
  92         case VCMD_new_s_context:
  93                 return vc_new_s_context(id, data);
  94 #endif
  95 #ifdef  CONFIG_VSERVER_LEGACYNET
  96         case VCMD_set_ipv4root:
  97                 return vc_set_ipv4root(id, data);
  98 #endif
  99
 100         case VCMD_task_xid:
 101                 return vc_task_xid(id, data);
 102         case VCMD_vx_info:
 103                 return vc_vx_info(id, data);
 104
 105         case VCMD_task_nid:
 106                 return vc_task_nid(id, data);
 107         case VCMD_nx_info:
 108                 return vc_nx_info(id, data);
 109
 110         case VCMD_set_namespace_v0:
 111                 return vc_set_namespace(-1, data);
 112         case VCMD_set_namespace:
 113                 return vc_set_namespace(id, data);
 114         }
 115
 116         /* those are allowed while in setup too */
 117         if (!vx_check(0, VX_ADMIN|VX_WATCH) &&
 118                 !vx_flags(VXF_STATE_SETUP,0))
 119                 return -EPERM;
 120
 121 #ifdef  CONFIG_VSERVER_LEGACY
 122         switch (cmd) {
 123         case VCMD_set_cflags:
 124         case VCMD_set_ccaps:
 125                 if (vx_check(0, VX_WATCH))
 126                         return 0;
 127         }
 128 #endif
 129
 130         switch (cmd) {
 131 #ifdef  CONFIG_IA32_EMULATION
 132         case VCMD_get_rlimit:
 133                 return __COMPAT(vc_get_rlimit, id, data, compat);
 134         case VCMD_set_rlimit:
 135                 return __COMPAT(vc_set_rlimit, id, data, compat);
 136 #else
 137         case VCMD_get_rlimit:
 138                 return vc_get_rlimit(id, data);
 139         case VCMD_set_rlimit:
 140                 return vc_set_rlimit(id, data);
 141 #endif
 142         case VCMD_get_rlimit_mask:
 143                 return vc_get_rlimit_mask(id, data);
 144
 145         case VCMD_get_vhi_name:
 146                 return vc_get_vhi_name(id, data);
 147         case VCMD_set_vhi_name:
 148                 return vc_set_vhi_name(id, data);
 149
 150         case VCMD_set_cflags:
 151                 return vc_set_cflags(id, data);
 152         case VCMD_get_cflags:
 153                 return vc_get_cflags(id, data);
 154
 155         case VCMD_set_ccaps:
 156                 return vc_set_ccaps(id, data);
 157         case VCMD_get_ccaps:
 158                 return vc_get_ccaps(id, data);
 159
 160         case VCMD_set_nflags:
 161                 return vc_set_nflags(id, data);
 162         case VCMD_get_nflags:
 163                 return vc_get_nflags(id, data);
 164
 165         case VCMD_set_ncaps:
 166                 return vc_set_ncaps(id, data);
 167         case VCMD_get_ncaps:
 168                 return vc_get_ncaps(id, data);
 169
 170         case VCMD_set_sched_v2:
 171                 return vc_set_sched_v2(id, data);
 172         /* this is version 3 */
 173         case VCMD_set_sched:
 174                 return vc_set_sched(id, data);
 175
 176         case VCMD_add_dlimit:
 177                 return __COMPAT(vc_add_dlimit, id, data, compat);
 178         case VCMD_rem_dlimit:
 179                 return __COMPAT(vc_rem_dlimit, id, data, compat);
 180         case VCMD_set_dlimit:
 181                 return __COMPAT(vc_set_dlimit, id, data, compat);
 182         case VCMD_get_dlimit:
 183                 return __COMPAT(vc_get_dlimit, id, data, compat);
 184         }
 185
 186         /* below here only with VX_ADMIN */
 187         if (!vx_check(0, VX_ADMIN|VX_WATCH))
 188                 return -EPERM;
 189
 190         switch (cmd) {
 191         case VCMD_ctx_kill:
 192                 return vc_ctx_kill(id, data);
 193
 194         case VCMD_wait_exit:
 195                 return vc_wait_exit(id, data);
 196
 197         case VCMD_create_context:
 198 #ifdef  CONFIG_VSERVER_LEGACY
 199                 return vc_ctx_create(id, NULL);
 200 #else
 201                 return -ENOSYS;
 202 #endif
 203
 204         case VCMD_get_iattr:
 205                 return __COMPAT(vc_get_iattr, id, data, compat);
 206         case VCMD_set_iattr:
 207                 return __COMPAT(vc_set_iattr, id, data, compat);
 208
 209         case VCMD_enter_namespace:
 210                 return vc_enter_namespace(id, data);
 211
 212         case VCMD_ctx_create_v0:
 213 #ifdef  CONFIG_VSERVER_LEGACY
 214                 if (id == 1) {
 215                         current->xid = 1;
 216                         return 1;
 217                 }
 218 #endif
 219                 return vc_ctx_create(id, NULL);
 220         case VCMD_ctx_create:
 221                 return vc_ctx_create(id, data);
 222         case VCMD_ctx_migrate_v0:
 223                 return vc_ctx_migrate(id, NULL);
 224         case VCMD_ctx_migrate:
 225                 return vc_ctx_migrate(id, data);
 226
 227         case VCMD_net_create_v0:
 228                 return vc_net_create(id, NULL);
 229         case VCMD_net_create:
 230                 return vc_net_create(id, data);
 231         case VCMD_net_migrate:
 232                 return vc_net_migrate(id, data);
 233         case VCMD_net_add:
 234                 return vc_net_add(id, data);
 235         case VCMD_net_remove:
 236                 return vc_net_remove(id, data);
 237
 238         }
 239         return -ENOSYS;
 240 }
 241
 242 asmlinkage long
 243 sys_vserver(uint32_t cmd, uint32_t id, void __user *data)
 244 {
 245         long ret = do_vserver(cmd, id, data, 0);
 246
 247         vxdprintk(VXD_CBIT(switch, 1),
 248                 "vc: VCMD_%02d_%d[%d] = %08lx(%ld)",
 249                 VC_CATEGORY(cmd), VC_COMMAND(cmd),
 250                 VC_VERSION(cmd), ret, ret);
 251         return ret;
 252 }
 253
 254 #ifdef  CONFIG_COMPAT
 255
 256 asmlinkage long
 257 sys32_vserver(uint32_t cmd, uint32_t id, void __user *data)
 258 {
 259         long ret = do_vserver(cmd, id, data, 1);
 260
 261         vxdprintk(VXD_CBIT(switch, 1),
 262                 "vc: VCMD_%02d_%d[%d] = %08lx(%ld)",
 263                 VC_CATEGORY(cmd), VC_COMMAND(cmd),
 264                 VC_VERSION(cmd), ret, ret);
 265         return ret;
 266 }
 267
 268 #endif  /* CONFIG_COMPAT */