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