From nobody Mon Oct 11 19:06:24 2021 X-Original-To: dev-commits-src-branches@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 6E0F218019FE; Mon, 11 Oct 2021 19:06:24 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HSpDc2grTz3rmt; Mon, 11 Oct 2021 19:06:24 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 3C6C8266A0; Mon, 11 Oct 2021 19:06:24 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 19BJ6O2d097570; Mon, 11 Oct 2021 19:06:24 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 19BJ6ORq097569; Mon, 11 Oct 2021 19:06:24 GMT (envelope-from git) Date: Mon, 11 Oct 2021 19:06:24 GMT Message-Id: <202110111906.19BJ6ORq097569@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: David Bright Subject: git: e72fce241f88 - stable/12 - RPCBIND: skip ipv6 link local when request is not from link local address List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-branches@freebsd.org X-BeenThere: dev-commits-src-branches@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: dab X-Git-Repository: src X-Git-Refname: refs/heads/stable/12 X-Git-Reftype: branch X-Git-Commit: e72fce241f88737592219049648d93d58f0e63eb Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch stable/12 has been updated by dab: URL: https://cgit.FreeBSD.org/src/commit/?id=e72fce241f88737592219049648d93d58f0e63eb commit e72fce241f88737592219049648d93d58f0e63eb Author: David Bright AuthorDate: 2021-10-04 15:43:41 +0000 Commit: David Bright CommitDate: 2021-10-11 16:21:00 +0000 RPCBIND: skip ipv6 link local when request is not from link local address RPCINFO on macOS behaves different compared to other linux clients and doesn't provide request address in rpcb structure of the RPCBPROC_GETADDRLIST call which doesn't seem to be forbidden. In this case RPCBIND uses RPC call's source address and picks a closest corresponding local address. If there are no addresses in the same subnet as the source address, return of RPCBIND may vary depending on the order of addresses returned in getifaddrs. If a link local precedes global address it may be returned even if the request comes from neither a link local nor from link local in a different scope, which will prevent services like nfs from working in tpc6 scenario on macOS clients. Issue can be seen only on FreeBSD rpcbind port due to changes in workflow of addrmerge call. Submitted by: Dmitry Ovsyannikov (Dmitry.Ovsyannikov@dell.com) Sponsored by: Dell EMC (cherry picked from commit d18c9a91979543adc182c7b28819691b64fda388) --- usr.sbin/rpcbind/tests/addrmerge_test.c | 34 +++++++++++++++++++++++++++++++++ usr.sbin/rpcbind/util.c | 12 +++++++----- 2 files changed, 41 insertions(+), 5 deletions(-) diff --git a/usr.sbin/rpcbind/tests/addrmerge_test.c b/usr.sbin/rpcbind/tests/addrmerge_test.c index e1600f1a4837..a29dc30fdde8 100644 --- a/usr.sbin/rpcbind/tests/addrmerge_test.c +++ b/usr.sbin/rpcbind/tests/addrmerge_test.c @@ -257,6 +257,22 @@ mock_tun0(void) IFF_UP | IFF_RUNNING | IFF_POINTOPOINT | IFF_MULTICAST, 0, false); } +static void +mock_mlxen0(void) +{ + mock_ifaddr4("mlxen0", "192.0.3.1", "255.255.255.128", "192.0.3.127", + IFF_UP | IFF_BROADCAST | IFF_RUNNING | IFF_SIMPLEX | IFF_MULTICAST, + false); + /* Setting link local address before ipv6 address*/ + mock_ifaddr6("mlxen0", "fe80::4", "ffff:ffff:ffff:ffff::", + "fe80::ffff:ffff:ffff:ffff", + IFF_UP | IFF_BROADCAST | IFF_RUNNING | IFF_SIMPLEX | IFF_MULTICAST, + 3, false); + mock_ifaddr6("mlxen0", "2001:db8::7", "ffff:ffff:ffff:ffff::", + "2001:db8::ffff:ffff:ffff:ffff", + IFF_UP | IFF_BROADCAST | IFF_RUNNING | IFF_SIMPLEX | IFF_MULTICAST, + 0, false); +} /* Stub rpcbind functions */ int @@ -835,6 +851,23 @@ ATF_TC_BODY(addrmerge_recvdstaddr6_rev, tc) ATF_CHECK_STREQ("2001:db8::2.3.46", maddr); free(maddr); } + +ATF_TC_WITHOUT_HEAD(addrmerge_ipv6_other_subnet); +ATF_TC_BODY(addrmerge_ipv6_other_subnet, tc) +{ + char *maddr; + + /* getifaddrs will return link local before normal ipv6 */ + mock_lo0(); + mock_mlxen0(); + + maddr = do_addrmerge6("2001:db8:1::1.3.46"); + + /* We must return the closest ipv6 address*/ + ATF_REQUIRE(maddr != NULL); + ATF_CHECK_STREQ("2001:db8::7.3.46", maddr); + free(maddr); +} #endif /* INET6 */ @@ -864,6 +897,7 @@ ATF_TP_ADD_TCS(tp) ATF_TP_ADD_TC(tp, addrmerge_ipv6_linklocal_rev); ATF_TP_ADD_TC(tp, addrmerge_recvdstaddr6); ATF_TP_ADD_TC(tp, addrmerge_recvdstaddr6_rev); + ATF_TP_ADD_TC(tp, addrmerge_ipv6_other_subnet); #endif return (atf_no_error()); diff --git a/usr.sbin/rpcbind/util.c b/usr.sbin/rpcbind/util.c index 455578b657fb..e497e9227690 100644 --- a/usr.sbin/rpcbind/util.c +++ b/usr.sbin/rpcbind/util.c @@ -229,17 +229,19 @@ addrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr, * a link-local address then use the scope id to see * which one. */ - if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) && - IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) && - IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) { - if (SA2SIN6(ifsa)->sin6_scope_id == - SA2SIN6(caller_sa)->sin6_scope_id) { + if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa))) { + if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) && + IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa)) && + (SA2SIN6(ifsa)->sin6_scope_id == + SA2SIN6(caller_sa)->sin6_scope_id)) { const int goodness = 3; if (bestif_goodness < goodness) { bestif = ifap; bestif_goodness = goodness; } + } else { + continue; } } }