emks@uokvax.UUCP (01/26/85)
Can anyone explain the meaning of some #define items in <netinet/ip.h>?
I've attached an extract of some of the pertinent parts of the include
file below.
The entries are:
1. #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
What are "s,c,h,tcc"? Where is this define used?
2. /* bits for security (not byte swapped) */
#define IPOPT_SECUR_UNCLASS 0x0000
[...through...]
#define IPOPT_SECUR_TOPSECRET 0x6bc5
Where/when are these used?
Are these used for routing/rejection/warning/etc.? If so, what does
these actions?
3. And, finally, any of the TIMESTAMP options. General explanations.
I'll appreciate all help (via mail or message response). Thank you in advance.
kurt
========== ========== ===========
Extract from <netinet/ip.h>:
/* ip.h 6.1 83/07/29 */
/*
* Definitions for internet protocol version 4.
* Per RFC 791, September 1981.
*/
#define IPVERSION 4
. . . . .
/*
* Definitions for options.
*/
. . . . .
#define IPOPT_RR 7 /* record packet route */
#define IPOPT_TS 68 /* timestamp */
#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
#define IPOPT_LSRR 131 /* loose source route */
#define IPOPT_SATID 136 /* satnet id */
#define IPOPT_SSRR 137 /* strict source route */
/*
* Time stamp option structure.
*/
struct ip_timestamp {
u_char ipt_code; /* IPOPT_TS */
u_char ipt_len; /* size of structure (variable) */
u_char ipt_ptr; /* index of current entry */
u_char ipt_flg:4, /* flags, see below */
ipt_oflw:4; /* overflow counter */
union {
n_long ipt_time[1];
struct ipt_ta {
struct in_addr ipt_addr;
n_long ipt_time;
} ipt_ta[1];
}
};
/* flag bits for ipt_flg */
#define IPOPT_TS_TSONLY 0 /* timestamps only */
#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
#define IPOPT_TS_PRESPEC 2 /* specified modules only */
/* bits for security (not byte swapped) */
#define IPOPT_SECUR_UNCLASS 0x0000
#define IPOPT_SECUR_CONFID 0xf135
#define IPOPT_SECUR_EFTO 0x789a
#define IPOPT_SECUR_MMMM 0xbc4d
#define IPOPT_SECUR_RESTR 0xaf13
#define IPOPT_SECUR_SECRET 0xd788
#define IPOPT_SECUR_TOPSECRET 0x6bc5
. . . . .