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Make sure ip_newid etal doesn't return an ip_id of 0.

This commit is contained in:
matt 2007-12-22 16:04:45 +00:00
parent 08b0783a17
commit f7dbcaa3d4
1 changed files with 6 additions and 1 deletions
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7
sys/netinet/ip_var.h
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@ -1,4 +1,4 @@
/* $NetBSD: ip_var.h,v 1.81 2007/12/22 15:40:02 matt Exp $ */
/* $NetBSD: ip_var.h,v 1.82 2007/12/22 16:04:45 matt Exp $ */
/*
* Copyright (c) 1982, 1986, 1993
@ -279,6 +279,11 @@ ip_newid_range(unsigned int num)
return ip_randomid();
}
/*
* never allow an ip_id of 0. (detect wrap)
*/
if ((uint16_t)(ip_id + num) < ip_id)
ip_id = 1;
id = htons(ip_id);
ip_id += num;