package/emulators/gxemul/linux-tap.patch

   1 # --- T2-COPYRIGHT-NOTE-BEGIN ---
   2 # T2 SDE: package/*/gxemul/linux-tap.patch
   3 # Copyright (C) 2022 The T2 SDE Project
   4 #
   5 # This Copyright note is generated by scripts/Create-CopyPatch,
   6 # more information can be found in the files COPYING and README.
   7 #
   8 # This patch file is dual-licensed. It is available under the license the
   9 # patched project is licensed under, as long as it is an OpenSource license
  10 # as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
  11 # of the GNU General Public License version 2 as used by the T2 SDE.
  12 # --- T2-COPYRIGHT-NOTE-END ---
  13
  14 --- gxemul-0.7.0/src/net/net_tap.c.vanilla      2022-07-19 12:56:49.595843435 +0200
  15 +++ gxemul-0.7.0/src/net/net_tap.c      2022-07-19 13:06:28.069820370 +0200
  16 @@ -45,6 +45,9 @@
  17  #include <string.h>
  18  #include <unistd.h>
  19
  20 +#include <net/if.h>
  21 +#include <linux/if_tun.h>
  22 +
  23  #include "misc.h"
  24  #include "net.h"
  25
  26 @@ -163,13 +163,36 @@
  27   */
  28  bool net_tap_init(struct net *net, const char *tapdev)
  29  {
  30 -       int fd;
  31 +       int fd, ret, features;
  32         int one = 1;
  33
  34 -       fd = open(tapdev, O_RDWR);
  35 +       fd = open("/dev/net/tun", O_RDWR);
  36         if (fd < 0) {
  37                 debugmsg(SUBSYS_NET, "tap", VERBOSITY_ERROR,
  38 -                   "unable to open tap device '%s': %s",
  39 +                       "unable to open tap device '%s': %s",
  40 +                       tapdev, strerror(errno));
  41 +               return false;
  42 +       }
  43 +
  44 +       if (ioctl(fd, TUNGETFEATURES, &features) == -1) {
  45 +               debugmsg(SUBSYS_NET, "tap", VERBOSITY_ERROR, "%s", strerror(errno));
  46 +               features = 0;
  47 +       }
  48 +
  49 +       struct ifreq ifr;
  50 +       memset(&ifr, 0, sizeof(ifr));
  51 +       ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
  52 +
  53 +       if (features & IFF_ONE_QUEUE) {
  54 +               ifr.ifr_flags |= IFF_ONE_QUEUE;
  55 +       }
  56 +
  57 +       strcpy(ifr.ifr_name, tapdev);
  58 +
  59 +       ret = ioctl(fd, TUNSETIFF, (void *)&ifr);
  60 +       if (ret != 0) {
  61 +               debugmsg(SUBSYS_NET, "tap", VERBOSITY_ERROR,
  62 +                   "unable to configure tap device '%s': %s",
  63                     tapdev, strerror(errno));
  64                 return false;
  65         }