kernel/vserver/legacynet.c

   1
   2 /*
   3  *  linux/kernel/vserver/legacynet.c
   4  *
   5  *  Virtual Server: Legacy Network Funtions
   6  *
   7  *  Copyright (C) 2001-2003  Jacques Gelinas
   8  *  Copyright (C) 2003-2005  Herbert Pötzl
   9  *
  10  *  V0.01  broken out from legacy.c
  11  *
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/sched.h>
  16 #include <linux/vs_context.h>
  17 #include <linux/vs_network.h>
  18 #include <linux/vserver/legacy.h>
  19 #include <linux/vserver/namespace.h>
  20 #include <linux/namespace.h>
  21
  22 #include <asm/errno.h>
  23 #include <asm/uaccess.h>
  24
  25
  26 extern struct nx_info *create_nx_info(void);
  27
  28 /*  set ipv4 root (syscall) */
  29
  30 int vc_set_ipv4root(uint32_t nbip, void __user *data)
  31 {
  32         int i, err = -EPERM;
  33         struct vcmd_set_ipv4root_v3 vc_data;
  34         struct nx_info *new_nxi, *nxi = current->nx_info;
  35
  36         if (nbip < 0 || nbip > NB_IPV4ROOT)
  37                 return -EINVAL;
  38         if (copy_from_user (&vc_data, data, sizeof(vc_data)))
  39                 return -EFAULT;
  40
  41         if (!nxi || nxi->ipv4[0] == 0 || capable(CAP_NET_ADMIN))
  42                 // We are allowed to change everything
  43                 err = 0;
  44         else if (nxi) {
  45                 int found = 0;
  46
  47                 // We are allowed to select a subset of the currently
  48                 // installed IP numbers. No new one allowed
  49                 // We can't change the broadcast address though
  50                 for (i=0; i<nbip; i++) {
  51                         int j;
  52                         __u32 nxip = vc_data.nx_mask_pair[i].ip;
  53                         for (j=0; j<nxi->nbipv4; j++) {
  54                                 if (nxip == nxi->ipv4[j]) {
  55                                         found++;
  56                                         break;
  57                                 }
  58                         }
  59                 }
  60                 if ((found == nbip) &&
  61                         (vc_data.broadcast == nxi->v4_bcast))
  62                         err = 0;
  63         }
  64         if (err)
  65                 return err;
  66
  67         new_nxi = create_nx_info();
  68         if (!new_nxi)
  69                 return -EINVAL;
  70
  71         new_nxi->nbipv4 = nbip;
  72         for (i=0; i<nbip; i++) {
  73                 new_nxi->ipv4[i] = vc_data.nx_mask_pair[i].ip;
  74                 new_nxi->mask[i] = vc_data.nx_mask_pair[i].mask;
  75         }
  76         new_nxi->v4_bcast = vc_data.broadcast;
  77         // current->nx_info = new_nxi;
  78         if (nxi) {
  79                 printk("!!! switching nx_info %p->%p\n", nxi, new_nxi);
  80                 clr_nx_info(&current->nx_info);
  81         }
  82         nx_migrate_task(current, new_nxi);
  83         // set_nx_info(&current->nx_info, new_nxi);
  84         // current->nid = new_nxi->nx_id;
  85         put_nx_info(new_nxi);
  86         return 0;
  87 }
  88
  89