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Use a random IPv4 ID because the shuffling algorithm used before could expose

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information (Amit Klein)
This commit is contained in:
christos 2021-03-08 17:54:23 +00:00
parent 32fcdf5a4e
commit a07b5793ea
1 changed files with 4 additions and 2 deletions
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6
sys/netinet/in_var.h
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@ -1,4 +1,4 @@
/* $NetBSD: in_var.h,v 1.98 2020/09/11 15:22:12 roy Exp $ */
/* $NetBSD: in_var.h,v 1.99 2021/03/08 17:54:23 christos Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -65,6 +65,7 @@
#define _NETINET_IN_VAR_H_
#include <sys/queue.h>
#include <sys/cprng.h>
#define IN_IFF_TENTATIVE 0x01 /* tentative address */
#define IN_IFF_DUPLICATED 0x02 /* DAD detected duplicate */
@ -469,7 +470,8 @@ ip_newid_range(const struct in_ifaddr *ia, u_int num)
if (ip_do_randomid) {
/* XXX ignore num */
return ip_randomid(ip_ids, ia ? ia->ia_idsalt : 0);
id = (uint16_t)cprng_fast32();
return id ? id : 1;
}
/* Never allow an IP ID of 0 (detect wrap). */