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When the link-layer address of a router changes, select the

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best router again.  In particular, when the neighbor entry is newly
created, it might affect the selection policy.

Obtained from:	KAME
MFC after:	1 week
This commit is contained in:
Hajimu UMEMOTO 2001-07-04 11:27:24 +00:00
parent b23e7b410b
commit 554bf4aa86
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=79197
1 changed files with 18 additions and 0 deletions
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18
sys/netinet6/nd6.c
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@ -1785,6 +1785,24 @@ nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code)
break;
}
/*
* When the link-layer address of a router changes, select the
* best router again. In particular, when the neighbor entry is newly
* created, it might affect the selection policy.
* Question: can we restrict the first condition to the "is_newentry"
* case?
* XXX: when we hear an RA from a new router with the link-layer
* address option, defrouter_select() is called twice, since
* defrtrlist_update called the function as well. However, I believe
* we can compromise the overhead, since it only happens the first
* time.
* XXX: although defrouter_select() should not have a bad effect
* for those are not autoconfigured hosts, we explicitly avoid such
* cases for safety.
*/
if (do_update && ln->ln_router && !ip6_forwarding && ip6_accept_rtadv)
defrouter_select();
return rt;
}