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/sched.h>
  15 #include <linux/vs_context.h>
  16 #include <linux/vs_network.h>
  17 #include <linux/vserver/legacy.h>
  18 #include <linux/namespace.h>
  19 #include <linux/err.h>
  20
  21 #include <asm/errno.h>
  22 #include <asm/uaccess.h>
  23
  24
  25 extern struct nx_info *create_nx_info(void);
  26
  27 /*  set ipv4 root (syscall) */
  28
  29 int vc_set_ipv4root(uint32_t nbip, void __user *data)
  30 {
  31         int i, err = -EPERM;
  32         struct vcmd_set_ipv4root_v3 vc_data;
  33         struct nx_info *new_nxi, *nxi = current->nx_info;
  34
  35         if (nbip < 0 || nbip > NB_IPV4ROOT)
  36                 return -EINVAL;
  37         if (copy_from_user (&vc_data, data, sizeof(vc_data)))
  38                 return -EFAULT;
  39
  40         if (!nxi || nxi->ipv4[0] == 0 || capable(CAP_NET_ADMIN))
  41                 /* We are allowed to change everything */
  42                 err = 0;
  43         else if (nxi) {
  44                 int found = 0;
  45
  46                 /* We are allowed to select a subset of the currently
  47                    installed IP numbers. No new one are allowed
  48                    We can't change the broadcast address though */
  49                 for (i=0; i<nbip; i++) {
  50                         int j;
  51                         __u32 nxip = vc_data.nx_mask_pair[i].ip;
  52                         for (j=0; j<nxi->nbipv4; j++) {
  53                                 if (nxip == nxi->ipv4[j]) {
  54                                         found++;
  55                                         break;
  56                                 }
  57                         }
  58                 }
  59                 if ((found == nbip) &&
  60                         (vc_data.broadcast == nxi->v4_bcast))
  61                         err = 0;
  62         }
  63         if (err)
  64                 return err;
  65
  66         new_nxi = create_nx_info();
  67         if (IS_ERR(new_nxi))
  68                 return -EINVAL;
  69
  70         new_nxi->nbipv4 = nbip;
  71         for (i=0; i<nbip; i++) {
  72                 new_nxi->ipv4[i] = vc_data.nx_mask_pair[i].ip;
  73                 new_nxi->mask[i] = vc_data.nx_mask_pair[i].mask;
  74         }
  75         new_nxi->v4_bcast = vc_data.broadcast;
  76         if (nxi)
  77                 printk("!!! switching nx_info %p->%p\n", nxi, new_nxi);
  78
  79         nx_migrate_task(current, new_nxi);
  80         release_nx_info(new_nxi, NULL);
  81         put_nx_info(new_nxi);
  82         return 0;
  83 }
  84
  85