The branch main has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=9c9a76dc6873427b14f6c84397dd60ea8e529d8d
commit 9c9a76dc6873427b14f6c84397dd60ea8e529d8d Author: Kristof Provost <[email protected]> AuthorDate: 2023-07-20 07:41:45 +0000 Commit: Kristof Provost <[email protected]> CommitDate: 2023-07-24 14:47:34 +0000 mld: always commit state changes on leaving Resolve a race condition where we'd lose the Solicited-node multicast group subscription if we assigned the same IPv6 address twice. PR: 233683 Reviewed by: ae MFC after: 1 week Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D41124 --- sys/netinet6/mld6.c | 20 +++++++------------- 1 file changed, 7 insertions(+), 13 deletions(-) diff --git a/sys/netinet6/mld6.c b/sys/netinet6/mld6.c index 63f4e33ac64d..82bb69588fa2 100644 --- a/sys/netinet6/mld6.c +++ b/sys/netinet6/mld6.c @@ -2164,13 +2164,10 @@ static void mld_final_leave(struct in6_multi *inm, struct mld_ifsoftc *mli) { struct epoch_tracker et; - int syncstates; #ifdef KTR char ip6tbuf[INET6_ADDRSTRLEN]; #endif - syncstates = 1; - CTR4(KTR_MLD, "%s: final leave %s on ifp %p(%s)", __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr), inm->in6m_ifp, if_name(inm->in6m_ifp)); @@ -2234,7 +2231,6 @@ mld_final_leave(struct in6_multi *inm, struct mld_ifsoftc *mli) inm->in6m_state = MLD_LEAVING_MEMBER; inm->in6m_sctimer = 1; V_state_change_timers_running6 = 1; - syncstates = 0; } break; } @@ -2246,15 +2242,13 @@ mld_final_leave(struct in6_multi *inm, struct mld_ifsoftc *mli) break; } - if (syncstates) { - in6m_commit(inm); - CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__, - ip6_sprintf(ip6tbuf, &inm->in6m_addr), - if_name(inm->in6m_ifp)); - inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED; - CTR3(KTR_MLD, "%s: T1 now MCAST_UNDEFINED for %p/%s", - __func__, &inm->in6m_addr, if_name(inm->in6m_ifp)); - } + in6m_commit(inm); + CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__, + ip6_sprintf(ip6tbuf, &inm->in6m_addr), + if_name(inm->in6m_ifp)); + inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED; + CTR3(KTR_MLD, "%s: T1 now MCAST_UNDEFINED for %p/%s", + __func__, &inm->in6m_addr, if_name(inm->in6m_ifp)); } /*
