udp.h 2.1 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. * Definitions for the UDP protocol.
  7. *
  8. * Version: @(#)udp.h 1.0.2 04/28/93
  9. *
  10. * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  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. #ifndef _LINUX_UDP_H
  18. #define _LINUX_UDP_H
  19. #include <linux/types.h>
  20. struct udphdr {
  21. __be16 source;
  22. __be16 dest;
  23. __be16 len;
  24. __be16 check;
  25. };
  26. /* UDP socket options */
  27. #define UDP_CORK 1 /* Never send partially complete segments */
  28. #define UDP_ENCAP 100 /* Set the socket to accept encapsulated packets */
  29. /* UDP encapsulation types */
  30. #define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
  31. #define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */
  32. #ifdef __KERNEL__
  33. #include <linux/types.h>
  34. #include <net/inet_sock.h>
  35. #define UDP_HTABLE_SIZE 128
  36. struct udp_sock {
  37. /* inet_sock has to be the first member */
  38. struct inet_sock inet;
  39. int pending; /* Any pending frames ? */
  40. unsigned int corkflag; /* Cork is required */
  41. __u16 encap_type; /* Is this an Encapsulation socket? */
  42. /*
  43. * Following member retains the information to create a UDP header
  44. * when the socket is uncorked.
  45. */
  46. __u16 len; /* total length of pending frames */
  47. /*
  48. * Fields specific to UDP-Lite.
  49. */
  50. __u16 pcslen;
  51. __u16 pcrlen;
  52. /* indicator bits used by pcflag: */
  53. #define UDPLITE_BIT 0x1 /* set by udplite proto init function */
  54. #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
  55. #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
  56. __u8 pcflag; /* marks socket as UDP-Lite if > 0 */
  57. };
  58. static inline struct udp_sock *udp_sk(const struct sock *sk)
  59. {
  60. return (struct udp_sock *)sk;
  61. }
  62. #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
  63. #endif
  64. #endif /* _LINUX_UDP_H */