+
+#define __VCMD(vcmd, _perm, _args, _flags) \
+ case VCMD_ ## vcmd: perm = _perm; \
+ args = _args; flags = _flags; break
+
+
+#define VCA_NONE 0x00
+#define VCA_VXI 0x01
+#define VCA_NXI 0x02
+
+#define VCF_NONE 0x00
+#define VCF_INFO 0x01
+#define VCF_ADMIN 0x02
+#define VCF_ARES 0x06 /* includes admin */
+#define VCF_SETUP 0x08
+
+#define VCF_ZIDOK 0x10 /* zero id okay */
+
+
+static inline
+long do_vserver(uint32_t cmd, uint32_t id, void __user *data, int compat)
+{
+ long ret;
+ int permit = -1, state = 0;
+ int perm = -1, args = 0, flags = 0;
+ struct vx_info *vxi = NULL;
+ struct nx_info *nxi = NULL;
+
+ switch (cmd) {
+ /* unpriviledged commands */
+ __VCMD(get_version, 0, VCA_NONE, 0);
+ __VCMD(get_vci, 0, VCA_NONE, 0);
+ __VCMD(get_rlimit_mask, 0, VCA_NONE, 0);
+ __VCMD(get_space_mask, 0, VCA_NONE, 0);
+
+ /* info commands */
+ __VCMD(task_xid, 2, VCA_NONE, 0);
+ __VCMD(reset_minmax, 2, VCA_VXI, 0);
+ __VCMD(vx_info, 3, VCA_VXI, VCF_INFO);
+ __VCMD(get_bcaps, 3, VCA_VXI, VCF_INFO);
+ __VCMD(get_ccaps_v0, 3, VCA_VXI, VCF_INFO);
+ __VCMD(get_ccaps, 3, VCA_VXI, VCF_INFO);
+ __VCMD(get_cflags, 3, VCA_VXI, VCF_INFO);
+ __VCMD(get_vhi_name, 3, VCA_VXI, VCF_INFO);
+ __VCMD(get_rlimit, 3, VCA_VXI, VCF_INFO);
+
+ __VCMD(ctx_stat, 3, VCA_VXI, VCF_INFO);
+ __VCMD(virt_stat, 3, VCA_VXI, VCF_INFO);
+ __VCMD(sock_stat, 3, VCA_VXI, VCF_INFO);
+ __VCMD(rlimit_stat, 3, VCA_VXI, VCF_INFO);
+
+ __VCMD(task_nid, 2, VCA_NONE, 0);
+ __VCMD(nx_info, 3, VCA_NXI, VCF_INFO);
+ __VCMD(get_ncaps, 3, VCA_NXI, VCF_INFO);
+ __VCMD(get_nflags, 3, VCA_NXI, VCF_INFO);
+
+ __VCMD(get_iattr, 2, VCA_NONE, 0);
+ __VCMD(get_dlimit, 3, VCA_NONE, VCF_INFO);
+ __VCMD(get_sched, 3, VCA_VXI, VCF_INFO);
+ __VCMD(sched_info, 3, VCA_VXI, VCF_INFO|VCF_ZIDOK);
+
+ /* lower admin commands */
+ __VCMD(wait_exit, 4, VCA_VXI, VCF_INFO);
+ __VCMD(ctx_create_v0, 5, VCA_NONE, 0);
+ __VCMD(ctx_create, 5, VCA_NONE, 0);
+ __VCMD(ctx_migrate_v0, 5, VCA_VXI, VCF_ADMIN);
+ __VCMD(ctx_migrate, 5, VCA_VXI, VCF_ADMIN);
+ __VCMD(enter_space_v0, 5, VCA_VXI, VCF_ADMIN);
+ __VCMD(enter_space, 5, VCA_VXI, VCF_ADMIN);
+
+ __VCMD(net_create_v0, 5, VCA_NONE, 0);
+ __VCMD(net_create, 5, VCA_NONE, 0);
+ __VCMD(net_migrate, 5, VCA_NXI, VCF_ADMIN);
+
+ /* higher admin commands */
+ __VCMD(ctx_kill, 6, VCA_VXI, VCF_ARES);
+ __VCMD(set_space_v0, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_space, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+
+ __VCMD(set_ccaps_v0, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_ccaps, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_bcaps, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_cflags, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+
+ __VCMD(set_vhi_name, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_rlimit, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_sched, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_sched_v2, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_sched_v3, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_sched_v4, 7, VCA_VXI, VCF_ARES|VCF_SETUP);
+
+ __VCMD(set_ncaps, 7, VCA_NXI, VCF_ARES|VCF_SETUP);
+ __VCMD(set_nflags, 7, VCA_NXI, VCF_ARES|VCF_SETUP);
+ __VCMD(net_add, 8, VCA_NXI, VCF_ARES|VCF_SETUP);
+ __VCMD(net_remove, 8, VCA_NXI, VCF_ARES|VCF_SETUP);
+
+ __VCMD(set_iattr, 7, VCA_NONE, 0);
+ __VCMD(set_dlimit, 7, VCA_NONE, VCF_ARES);
+ __VCMD(add_dlimit, 8, VCA_NONE, VCF_ARES);
+ __VCMD(rem_dlimit, 8, VCA_NONE, VCF_ARES);
+
+ /* debug level admin commands */
+#ifdef CONFIG_VSERVER_HISTORY
+ __VCMD(dump_history, 9, VCA_NONE, 0);
+ __VCMD(read_history, 9, VCA_NONE, 0);
+#endif
+#ifdef CONFIG_VSERVER_MONITOR
+ __VCMD(read_monitor, 9, VCA_NONE, 0);
+#endif
+
+ /* legacy commands */
+#ifdef CONFIG_VSERVER_LEGACY
+ __VCMD(new_s_context, 1, VCA_NONE, 0);
+ __VCMD(create_context, 5, VCA_NONE, 0);
+#endif
+#ifdef CONFIG_VSERVER_LEGACYNET
+ __VCMD(set_ipv4root, 5, VCA_NONE, 0);
+#endif
+ default:
+ perm = -1;
+ }
+
+ vxdprintk(VXD_CBIT(switch, 0),
+ "vc: VCMD_%02d_%d[%d], %d,%p [%d,%d,%x,%x]",
+ VC_CATEGORY(cmd), VC_COMMAND(cmd),
+ VC_VERSION(cmd), id, data, compat,
+ perm, args, flags);
+
+ ret = -ENOSYS;
+ if (perm < 0)
+ goto out;
+
+ state = 1;
+#ifdef CONFIG_VSERVER_LEGACY
+ if (!capable(CAP_CONTEXT) &&
+ /* dirty hack for capremove */
+ !(cmd==VCMD_new_s_context && id==-2))
+ goto out;
+#else
+ if (!capable(CAP_CONTEXT))
+ goto out;
+#endif
+
+ state = 2;
+ /* moved here from the individual commands */
+ ret = -EPERM;
+ if ((perm > 1) && !capable(CAP_SYS_ADMIN))
+ goto out;
+
+ state = 3;
+ /* vcmd involves resource management */
+ ret = -EPERM;
+ if ((flags & VCF_ARES) && !capable(CAP_SYS_RESOURCE))
+ goto out;
+
+ state = 4;
+ /* various legacy exceptions */
+ switch (cmd) {
+#ifdef CONFIG_VSERVER_LEGACY
+ case VCMD_set_cflags:
+ case VCMD_set_ccaps_v0:
+ ret = 0;
+ if (vx_check(0, VS_WATCH))
+ goto out;
+ break;
+
+ case VCMD_ctx_create_v0:
+#endif
+ /* will go away when spectator is a cap */
+ case VCMD_ctx_migrate_v0:
+ case VCMD_ctx_migrate:
+ if (id == 1) {
+ current->xid = 1;
+ ret = 1;
+ goto out;
+ }
+ break;
+
+ /* will go away when spectator is a cap */
+ case VCMD_net_migrate:
+ if (id == 1) {
+ current->nid = 1;
+ ret = 1;
+ goto out;
+ }
+ break;
+
+ /* legacy special casing */
+ case VCMD_set_space_v0:
+ id = -1;
+ break;
+ }
+
+ /* vcmds are fine by default */
+ permit = 1;
+
+ /* admin type vcmds require admin ... */
+ if (flags & VCF_ADMIN)
+ permit = vx_check(0, VS_ADMIN) ? 1 : 0;
+
+ /* ... but setup type vcmds override that */
+ if (!permit && (flags & VCF_SETUP))
+ permit = vx_flags(VXF_STATE_SETUP, 0) ? 2 : 0;
+
+ state = 5;
+ ret = -EPERM;
+ if (!permit)
+ goto out;
+
+ state = 6;
+ if (!id && (flags & VCF_ZIDOK))
+ goto skip_id;
+
+ ret = -ESRCH;
+ if (args & VCA_VXI) {
+ vxi = lookup_vx_info(id);
+ if (!vxi)
+ goto out;
+
+ if ((flags & VCF_ADMIN) &&
+ /* special case kill for shutdown */
+ (cmd != VCMD_ctx_kill) &&
+ /* can context be administrated? */
+ !vx_info_flags(vxi, VXF_STATE_ADMIN, 0)) {
+ ret = -EACCES;
+ goto out_vxi;
+ }
+ }
+ state = 7;
+ if (args & VCA_NXI) {
+ nxi = lookup_nx_info(id);
+ if (!nxi)
+ goto out_vxi;
+
+ if ((flags & VCF_ADMIN) &&
+ /* can context be administrated? */
+ !nx_info_flags(nxi, NXF_STATE_ADMIN, 0)) {
+ ret = -EACCES;
+ goto out_nxi;
+ }
+ }
+skip_id:
+ state = 8;
+ ret = do_vcmd(cmd, id, vxi, nxi, data, compat);
+
+out_nxi:
+ if ((args & VCA_NXI) && nxi)
+ put_nx_info(nxi);
+out_vxi:
+ if ((args & VCA_VXI) && vxi)
+ put_vx_info(vxi);
+out:
+ vxdprintk(VXD_CBIT(switch, 1),
+ "vc: VCMD_%02d_%d[%d] = %08lx(%ld) [%d,%d]",
+ VC_CATEGORY(cmd), VC_COMMAND(cmd),
+ VC_VERSION(cmd), ret, ret, state, permit);
+ return ret;
+}
+
+asmlinkage long
+sys_vserver(uint32_t cmd, uint32_t id, void __user *data)
+{
+ return do_vserver(cmd, id, data, 0);
+}
+
+#ifdef CONFIG_COMPAT
+
+asmlinkage long
+sys32_vserver(uint32_t cmd, uint32_t id, void __user *data)
+{
+ return do_vserver(cmd, id, data, 1);
+}
+
+#endif /* CONFIG_COMPAT */