op-state-get.c 2.5 KB

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  1. /*
  2. * Linux WiMAX
  3. * Implement and export a method for getting a WiMAX device current state
  4. *
  5. * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
  6. *
  7. * Based on previous WiMAX core work by:
  8. * Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com>
  9. * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  10. *
  11. * This program is free software; you can redistribute it and/or
  12. * modify it under the terms of the GNU General Public License version
  13. * 2 as published by the Free Software Foundation.
  14. *
  15. * This program is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU General Public License
  21. * along with this program; if not, write to the Free Software
  22. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23. * 02110-1301, USA.
  24. */
  25. #include <net/wimax.h>
  26. #include <net/genetlink.h>
  27. #include <linux/wimax.h>
  28. #include <linux/security.h>
  29. #include "wimax-internal.h"
  30. #define D_SUBMODULE op_state_get
  31. #include "debug-levels.h"
  32. static const struct nla_policy wimax_gnl_state_get_policy[WIMAX_GNL_ATTR_MAX + 1] = {
  33. [WIMAX_GNL_STGET_IFIDX] = {
  34. .type = NLA_U32,
  35. },
  36. };
  37. /*
  38. * Exporting to user space over generic netlink
  39. *
  40. * Parse the state get command from user space, return a combination
  41. * value that describe the current state.
  42. *
  43. * No attributes.
  44. */
  45. static
  46. int wimax_gnl_doit_state_get(struct sk_buff *skb, struct genl_info *info)
  47. {
  48. int result, ifindex;
  49. struct wimax_dev *wimax_dev;
  50. struct device *dev;
  51. d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
  52. result = -ENODEV;
  53. if (info->attrs[WIMAX_GNL_STGET_IFIDX] == NULL) {
  54. printk(KERN_ERR "WIMAX_GNL_OP_STATE_GET: can't find IFIDX "
  55. "attribute\n");
  56. goto error_no_wimax_dev;
  57. }
  58. ifindex = nla_get_u32(info->attrs[WIMAX_GNL_STGET_IFIDX]);
  59. wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
  60. if (wimax_dev == NULL)
  61. goto error_no_wimax_dev;
  62. dev = wimax_dev_to_dev(wimax_dev);
  63. /* Execute the operation and send the result back to user space */
  64. result = wimax_state_get(wimax_dev);
  65. dev_put(wimax_dev->net_dev);
  66. error_no_wimax_dev:
  67. d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
  68. return result;
  69. }
  70. struct genl_ops wimax_gnl_state_get = {
  71. .cmd = WIMAX_GNL_OP_STATE_GET,
  72. .flags = GENL_ADMIN_PERM,
  73. .policy = wimax_gnl_state_get_policy,
  74. .doit = wimax_gnl_doit_state_get,
  75. .dumpit = NULL,
  76. };