protocol.c 1.9 KB

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  1. /*
  2. * INET An implementation of the TCP/IP protocol suite for the LINUX
  3. * operating system. INET is implemented using the BSD Socket
  4. * interface as the means of communication with the user level.
  5. *
  6. * PF_INET6 protocol dispatch tables.
  7. *
  8. * Version: $Id: protocol.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
  9. *
  10. * Authors: Pedro Roque <roque@di.fc.ul.pt>
  11. *
  12. * This program is free software; you can redistribute it and/or
  13. * modify it under the terms of the GNU General Public License
  14. * as published by the Free Software Foundation; either version
  15. * 2 of the License, or (at your option) any later version.
  16. */
  17. /*
  18. * Changes:
  19. *
  20. * Vince Laviano (vince@cs.stanford.edu) 16 May 2001
  21. * - Removed unused variable 'inet6_protocol_base'
  22. * - Modified inet6_del_protocol() to correctly maintain copy bit.
  23. */
  24. #include <linux/errno.h>
  25. #include <linux/types.h>
  26. #include <linux/socket.h>
  27. #include <linux/sockios.h>
  28. #include <linux/net.h>
  29. #include <linux/in6.h>
  30. #include <linux/netdevice.h>
  31. #include <linux/if_arp.h>
  32. #include <net/sock.h>
  33. #include <net/snmp.h>
  34. #include <net/ipv6.h>
  35. #include <net/protocol.h>
  36. struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
  37. static DEFINE_SPINLOCK(inet6_proto_lock);
  38. int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
  39. {
  40. int ret, hash = protocol & (MAX_INET_PROTOS - 1);
  41. spin_lock_bh(&inet6_proto_lock);
  42. if (inet6_protos[hash]) {
  43. ret = -1;
  44. } else {
  45. inet6_protos[hash] = prot;
  46. ret = 0;
  47. }
  48. spin_unlock_bh(&inet6_proto_lock);
  49. return ret;
  50. }
  51. /*
  52. * Remove a protocol from the hash tables.
  53. */
  54. int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
  55. {
  56. int ret, hash = protocol & (MAX_INET_PROTOS - 1);
  57. spin_lock_bh(&inet6_proto_lock);
  58. if (inet6_protos[hash] != prot) {
  59. ret = -1;
  60. } else {
  61. inet6_protos[hash] = NULL;
  62. ret = 0;
  63. }
  64. spin_unlock_bh(&inet6_proto_lock);
  65. synchronize_net();
  66. return ret;
  67. }