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ntp: add extension field to provide network correction

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To be able to verify PTP corrections, the client will need to know both
the correction of the request received by the server and the correction
of the response. Add a new experimental NTP extension field that the
clients will use to request the correction and servers return the
value.
This commit is contained in:
Miroslav Lichvar 2023-09-26 12:30:10 +02:00
parent 6372a9f93f
commit d9ae724c60
2 changed files with 17 additions and 0 deletions
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11
ntp.h
View file

@ -116,8 +116,10 @@ typedef struct {
/* Non-authentication extension fields and corresponding internal flags */
#define NTP_EF_EXP_MONO_ROOT 0xF323
#define NTP_EF_EXP_NET_CORRECTION 0xF324
#define NTP_EF_FLAG_EXP_MONO_ROOT 0x1
#define NTP_EF_FLAG_EXP_NET_CORRECTION 0x2
/* Pre-NTPv5 experimental extension field */
typedef struct {
@ -130,6 +132,15 @@ typedef struct {
#define NTP_EF_EXP_MONO_ROOT_MAGIC 0xF5BEDD9AU
/* Experimental extension field to provide PTP corrections */
typedef struct {
uint32_t magic;
NTP_int64 correction;
uint32_t reserved[3];
} NTP_EFExpNetCorrection;
#define NTP_EF_EXP_NET_CORRECTION_MAGIC 0x07AC2CEBU
/* Authentication extension fields */
#define NTP_EF_NTS_UNIQUE_IDENTIFIER 0x0104

6
ntp_core.c
View file

@ -375,6 +375,7 @@ do_size_checks(void)
assert(offsetof(NTP_Packet, transmit_ts) == 40);
assert(sizeof (NTP_EFExpMonoRoot) == 24);
assert(sizeof (NTP_EFExpNetCorrection) == 24);
}
/* ================================================== */
@ -1595,6 +1596,11 @@ parse_packet(NTP_Packet *packet, int length, NTP_PacketInfo *info)
NTP_EF_EXP_MONO_ROOT_MAGIC))
info->ext_field_flags |= NTP_EF_FLAG_EXP_MONO_ROOT;
break;
case NTP_EF_EXP_NET_CORRECTION:
if (is_exp_ef(ef_body, ef_body_length, sizeof (NTP_EFExpNetCorrection),
NTP_EF_EXP_NET_CORRECTION_MAGIC))
info->ext_field_flags |= NTP_EF_FLAG_EXP_NET_CORRECTION;
break;
default:
DEBUG_LOG("Unknown extension field type=%x", (unsigned int)ef_type);
}