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netbsd; on interface removal, force pcbs to leave from multicast groups

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pointing toward the interface about to be removed.  sync with kame
XXX still need more discussions on semantics.  the behavior should be safer
This commit is contained in:
itojun 2001-06-27 15:53:14 +00:00
parent 669cdc0b4f
commit 9ccf08b3c5
1 changed files with 28 additions and 1 deletions
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29
sys/netinet6/in6_pcb.c
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@ -1,4 +1,4 @@
/* $NetBSD: in6_pcb.c,v 1.36 2001/05/11 18:38:03 itojun Exp $ */
/* $NetBSD: in6_pcb.c,v 1.37 2001/06/27 15:53:14 itojun Exp $ */
/* $KAME: in6_pcb.c,v 1.84 2001/02/08 18:02:08 itojun Exp $ */
/*
@ -608,12 +608,39 @@ in6_pcbpurgeif(head, ifp)
struct ifnet *ifp;
{
struct in6pcb *in6p, *nin6p;
struct ip6_moptions *im6o;
struct in6_multi_mship *imm, *nimm;
for (in6p = head->in6p_next; in6p != head; in6p = nin6p) {
nin6p = in6p->in6p_next;
if (in6p->in6p_route.ro_rt != NULL &&
in6p->in6p_route.ro_rt->rt_ifp == ifp)
in6_rtchange(in6p, 0);
im6o = in6p->in6p_moptions;
if (im6o) {
/*
* Unselect the outgoing interface if it is being
* detached.
*/
if (im6o->im6o_multicast_ifp == ifp)
im6o->im6o_multicast_ifp = NULL;
/*
* Drop multicast group membership if we joined
* through the interface being detached.
* XXX controversial - is it really legal for kernel
* to force this?
*/
for (imm = im6o->im6o_memberships.lh_first;
imm != NULL; imm = nimm) {
nimm = imm->i6mm_chain.le_next;
if (imm->i6mm_maddr->in6m_ifp == ifp) {
LIST_REMOVE(imm, i6mm_chain);
in6_delmulti(imm->i6mm_maddr);
free(imm, M_IPMADDR);
}
}
}
}
}