kernel/vserver/legacy.c

   1 /*
   2  *  linux/kernel/vserver/legacy.c
   3  *
   4  *  Virtual Server: Legacy Funtions
   5  *
   6  *  Copyright (C) 2001-2003  Jacques Gelinas
   7  *  Copyright (C) 2003-2004  Herbert Pötzl
   8  *
   9  *  V0.01  broken out from vcontext.c V0.05
  10  *
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/vserver/legacy.h>
  15 #include <linux/vserver/context.h>
  16 #include <linux/vserver/namespace.h>
  17 #include <linux/vserver.h>
  18 #include <linux/sched.h>
  19 #include <linux/namespace.h>
  20
  21 #include <asm/errno.h>
  22 #include <asm/uaccess.h>
  23
  24
  25
  26 static int vx_set_initpid(struct vx_info *vxi, int pid)
  27 {
  28         if (vxi->vx_initpid)
  29                 return -EPERM;
  30
  31         vxi->vx_initpid = pid;
  32         return 0;
  33 }
  34
  35 int vc_new_s_context(uint32_t ctx, void __user *data)
  36 {
  37         int ret = -ENOMEM;
  38         struct vcmd_new_s_context_v1 vc_data;
  39         struct vx_info *new_vxi;
  40
  41         if (copy_from_user(&vc_data, data, sizeof(vc_data)))
  42                 return -EFAULT;
  43
  44         /* legacy hack, will be removed soon */
  45         if (ctx == -2) {
  46                 /* assign flags and initpid */
  47                 if (!current->vx_info)
  48                         return -EINVAL;
  49                 ret = 0;
  50                 if (vc_data.flags & VX_INFO_INIT)
  51                         ret = vx_set_initpid(current->vx_info, current->tgid);
  52                 if (ret == 0) {
  53                         /* We keep the same vx_id, but lower the capabilities */
  54                         current->vx_info->vx_bcaps &= (~vc_data.remove_cap);
  55                         // current->cap_bset &= (~vc_data.remove_cap);
  56                         ret = vx_current_xid();
  57                         current->vx_info->vx_flags |= vc_data.flags;
  58                 }
  59                 return ret;
  60         }
  61
  62         if (!vx_check(0, VX_ADMIN) ||
  63                 !capable(CAP_SYS_ADMIN) || vx_flags(VX_INFO_LOCK, 0))
  64                 return -EPERM;
  65
  66         /* ugly hack for Spectator */
  67         if (ctx == 1) {
  68                 current->xid = 1;
  69                 return 0;
  70         }
  71
  72         if (((ctx > MAX_S_CONTEXT) && (ctx != VX_DYNAMIC_ID)) ||
  73                 (ctx == 0))
  74                 return -EINVAL;
  75
  76         if ((ctx == VX_DYNAMIC_ID) || (ctx < MIN_D_CONTEXT))
  77                 new_vxi = locate_or_create_vx_info(ctx);
  78         else
  79                 new_vxi = locate_vx_info(ctx);
  80
  81         if (!new_vxi)
  82                 return -EINVAL;
  83         new_vxi->vx_flags &= ~(VXF_STATE_SETUP|VXF_STATE_INIT);
  84
  85         ret = vx_migrate_task(current, new_vxi);
  86         if (ret == 0) {
  87                 current->vx_info->vx_bcaps &= (~vc_data.remove_cap);
  88                 // current->cap_bset &= (~vc_data.remove_cap);
  89                 new_vxi->vx_flags |= vc_data.flags;
  90                 if (vc_data.flags & VX_INFO_INIT)
  91                         vx_set_initpid(new_vxi, current->tgid);
  92                 if (vc_data.flags & VX_INFO_NAMESPACE)
  93                         vx_set_namespace(new_vxi,
  94                                 current->namespace, current->fs);
  95                 if (vc_data.flags & VX_INFO_NPROC)
  96                         new_vxi->limit.rlim[RLIMIT_NPROC] =
  97                                 current->rlim[RLIMIT_NPROC].rlim_max;
  98                 ret = new_vxi->vx_id;
  99         }
 100         put_vx_info(new_vxi);
 101         return ret;
 102 }
 103
 104
 105 extern struct nx_info *create_nx_info(void);
 106
 107 /*  set ipv4 root (syscall) */
 108
 109 int vc_set_ipv4root(uint32_t nbip, void __user *data)
 110 {
 111         int i, err = -EPERM;
 112         struct vcmd_set_ipv4root_v3 vc_data;
 113         struct nx_info *new_nxi, *nxi = current->nx_info;
 114
 115         if (nbip < 0 || nbip > NB_IPV4ROOT)
 116                 return -EINVAL;
 117         if (copy_from_user (&vc_data, data, sizeof(vc_data)))
 118                 return -EFAULT;
 119
 120         if (!nxi || nxi->ipv4[0] == 0 || capable(CAP_NET_ADMIN))
 121                 // We are allowed to change everything
 122                 err = 0;
 123         else if (nxi) {
 124                 int found = 0;
 125
 126                 // We are allowed to select a subset of the currently
 127                 // installed IP numbers. No new one allowed
 128                 // We can't change the broadcast address though
 129                 for (i=0; i<nbip; i++) {
 130                         int j;
 131                         __u32 nxip = vc_data.nx_mask_pair[i].ip;
 132                         for (j=0; j<nxi->nbipv4; j++) {
 133                                 if (nxip == nxi->ipv4[j]) {
 134                                         found++;
 135                                         break;
 136                                 }
 137                         }
 138                 }
 139                 if ((found == nbip) &&
 140                         (vc_data.broadcast == nxi->v4_bcast))
 141                         err = 0;
 142         }
 143         if (err)
 144                 return err;
 145
 146         new_nxi = create_nx_info();
 147         if (!new_nxi)
 148                 return -EINVAL;
 149
 150         new_nxi->nbipv4 = nbip;
 151         for (i=0; i<nbip; i++) {
 152                 new_nxi->ipv4[i] = vc_data.nx_mask_pair[i].ip;
 153                 new_nxi->mask[i] = vc_data.nx_mask_pair[i].mask;
 154         }
 155         new_nxi->v4_bcast = vc_data.broadcast;
 156         // current->nx_info = new_nxi;
 157         if (nxi) {
 158                 printk("!!! switching nx_info %p->%p\n", nxi, new_nxi);
 159                 clr_nx_info(&current->nx_info);
 160         }
 161         nx_migrate_task(current, new_nxi);
 162         // set_nx_info(&current->nx_info, new_nxi);
 163         // current->nid = new_nxi->nx_id;
 164         put_nx_info(new_nxi);
 165         return 0;
 166 }
 167
 168