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RPCBIND: skip ipv6 link local when request is not from link local address

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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)
Reviewers:	dab
Differential Revision:	https://reviews.freebsd.org/D31491
Sponsored by:	Dell EMC
MFC to:	stable/12, stable/13
MFC after:	1 week
This commit is contained in:
David Bright 2021-10-04 08:43:41 -07:00
parent d6dffbae96
commit d18c9a9197
2 changed files with 41 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
usr.sbin/rpcbind/tests/addrmerge_test.c
View File

@ -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());

12
usr.sbin/rpcbind/util.c
View File

@ -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;
}
}
}