kern/56863: please support IPsec extended replay window

[andrew.cagney%gmail.com@localhost]

>Number:         56863
>Category:       kern
>Synopsis:       please support IPsec extended replay window
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 05 15:15:00 +0000 2022
>Originator:     Andrew Cagney
>Release:        trunk
>Organization:
>Environment:
trunk
>Description:
The pfkey v2 structure sadb_sa has the 8-bit field:
  sys/net/pfkeyv2.h:  uint8_t sadb_sa_replay;
for specifying the size of the window.

Can the code please be enhanced to also support FreeBSD's 32-bit replay structure:

#define SADB_X_EXT_SA_REPLAY          26        /* Replay window override. */
/* Additional large replay window support
 */
struct sadb_x_sa_replay {
  u_int16_t sadb_x_sa_replay_len;
  u_int16_t sadb_x_sa_replay_exttype;
  u_int32_t sadb_x_sa_replay_replay;    /* in packets */
};
_Static_assert(sizeof(struct sadb_x_sa_replay) == 8, "struct size mismatch");

>How-To-Repeat:

>Fix: