[src/trunk]: src/sys/netinet reinstate a simple version of ip_randomid()

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d1ff69703c39
branches:  trunk
changeset: 960125:d1ff69703c39
user:      christos <christos%NetBSD.org@localhost>
date:      Mon Mar 08 20:01:54 2021 +0000

description:
reinstate a simple version of ip_randomid()

diffstat:

 sys/net/npf/npf_ext_normalize.c |   4 ++--
 sys/netinet/in_var.h            |  13 ++++++++++---
 2 files changed, 12 insertions(+), 5 deletions(-)

diffs (55 lines):

diff -r 3edf6341df93 -r d1ff69703c39 sys/net/npf/npf_ext_normalize.c
--- a/sys/net/npf/npf_ext_normalize.c   Mon Mar 08 20:01:16 2021 +0000
+++ b/sys/net/npf/npf_ext_normalize.c   Mon Mar 08 20:01:54 2021 +0000
@@ -26,7 +26,7 @@
 
 #ifdef _KERNEL
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: npf_ext_normalize.c,v 1.10 2020/05/30 14:16:56 rmind Exp $");
+__KERNEL_RCSID(0, "$NetBSD: npf_ext_normalize.c,v 1.11 2021/03/08 20:01:54 christos Exp $");
 
 #include <sys/types.h>
 #include <sys/module.h>
@@ -114,7 +114,7 @@
        if (np->n_random_id) {
                uint16_t oid = ip->ip_id, nid;
 
-               nid = htons(ip_randomid(ip_ids, 0));
+               nid = ip_randomid();
                cksum = npf_fixup16_cksum(cksum, oid, nid);
                ip->ip_id = nid;
        }
diff -r 3edf6341df93 -r d1ff69703c39 sys/netinet/in_var.h
--- a/sys/netinet/in_var.h      Mon Mar 08 20:01:16 2021 +0000
+++ b/sys/netinet/in_var.h      Mon Mar 08 20:01:54 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: in_var.h,v 1.100 2021/03/08 18:03:25 christos Exp $    */
+/*     $NetBSD: in_var.h,v 1.101 2021/03/08 20:01:54 christos Exp $    */
 
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -450,6 +450,14 @@
 extern uint16_t                ip_id;
 extern int             ip_do_randomid;
 
+static __inline uint16_t
+ip_randomid(void)
+{
+
+       uint16_t id = (uint16_t)cprng_fast32();
+       return id ? id : 1;
+}
+
 /*
  * ip_newid_range: "allocate" num contiguous IP IDs.
  *
@@ -462,8 +470,7 @@
 
        if (ip_do_randomid) {
                /* XXX ignore num */
-               id = (uint16_t)cprng_fast32();
-               return id ? id : 1;
+               return ip_randomid();
        }
 
        /* Never allow an IP ID of 0 (detect wrap). */