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Update the MTU in affected routes when IPv6 RA changes the MTU

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ip6_calcmtu() only looks at the interface MTU if neither the TCP hostcache
nor the route provides an MTU.  Update the routes so they do not provide
stale MTUs.

This fixes UNH IPv6 conformance test cases v6LC_4_1_08 and v6LC_4_1_09,
which use a RA to reduce the link MTU from 1500 to 1280.

Reported and tested by:	Farrell Woods <Farrell_Woods@Dell.com>
Reviewed by:	dab, melifaro
Discussed with:	ae
MFC after:	1 week
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D14257
This commit is contained in:
Eric van Gyzen 2018-02-12 19:49:20 +00:00
parent 7c7c726bca
commit 0bbfb20fe5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329181
1 changed files with 4 additions and 1 deletions
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5
sys/netinet6/nd6_rtr.c
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@ -408,8 +408,11 @@ nd6_ra_input(struct mbuf *m, int off, int icmp6len)
int change = (ndi->linkmtu != mtu);
ndi->linkmtu = mtu;
if (change) /* in6_maxmtu may change */
if (change) {
/* in6_maxmtu may change */
in6_setmaxmtu();
rt_updatemtu(ifp);
}
} else {
nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
"mtu=%lu sent from %s; "