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Add IPv4 ID when the ipsecif(4) packet can be fragmented. Implemented by hsuenaga@IIJ and ohishi@IIJ, thanks.

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This modification reduces packet loss of fragmented packets on a
network where reordering occurs.

Alghough this modification has been applied, IPv4 ID is not set for
the packet smaller then IP_MINFRAGSIZE. According to RFC 6864, that
must not cause problems.

XXX pullup-8
This commit is contained in:
knakahara 2018-04-06 10:31:35 +00:00
parent c6bcca39f7
commit 7c378391ba
1 changed files with 6 additions and 3 deletions
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9
sys/netipsec/ipsecif.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ipsecif.c,v 1.5 2018/03/13 03:05:12 knakahara Exp $ */
/* $NetBSD: ipsecif.c,v 1.6 2018/04/06 10:31:35 knakahara Exp $ */
/*
* Copyright (c) 2017 Internet Initiative Japan Inc.
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ipsecif.c,v 1.5 2018/03/13 03:05:12 knakahara Exp $");
__KERNEL_RCSID(0, "$NetBSD: ipsecif.c,v 1.6 2018/04/06 10:31:35 knakahara Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@ -135,7 +135,10 @@ ipsecif4_prepend_hdr(struct ipsec_variant *var, struct mbuf *m,
ip = mtod(m, struct ip *);
ip->ip_v = IPVERSION;
ip->ip_off = htons(0);
ip->ip_id = 0;
if (m->m_pkthdr.len < IP_MINFRAGSIZE)
ip->ip_id = 0;
else
ip->ip_id = ip_newid(NULL);
ip->ip_hl = sizeof(*ip) >> 2;
if (ip_ipsec_copy_tos)
ip->ip_tos = tos;