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33 #ifndef _NETINET_UDP_H_
34 #define _NETINET_UDP_H_
36 #include <sys/types.h>
39 * UDP protocol header.
40 * Per RFC 768, September, 1981.
43 u_short uh_sport; /* source port */
44 u_short uh_dport; /* destination port */
45 u_short uh_ulen; /* udp length */
46 u_short uh_sum; /* udp checksum */
50 * User-settable options (used with setsockopt).
54 /* Start of reserved space for third-party user-settable options. */
55 #define UDP_VENDOR SO_VENDOR
58 * UDP Encapsulation of IPsec Packets options.
60 /* Encapsulation types. */
61 #define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
62 #define UDP_ENCAP_ESPINUDP 2 /* RFC3948 */
64 /* Default ESP in UDP encapsulation port. */
65 #define UDP_ENCAP_ESPINUDP_PORT 500
67 /* Maximum UDP fragment size for ESP over UDP. */
68 #define UDP_ENCAP_ESPINUDP_MAXFRAGLEN 552