The branch main has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=74c2461386ea5eeb41e674df6b16a44b0509a882
commit 74c2461386ea5eeb41e674df6b16a44b0509a882 Author: Kristof Provost <[email protected]> AuthorDate: 2023-10-03 15:11:44 +0000 Commit: Kristof Provost <[email protected]> CommitDate: 2023-10-04 08:16:03 +0000 pf: cope with missing rpool.cur If we're evaluating a pfsync'd state (and have different rules on both ends) our state may point to the default rule, which does not have rpool.cur set. As a result we can end up dereferencing a NULL pointer. Explicitly check for this when we try to re-construct the route-to interface. Also add a test case which can trigger this issue. MFC after: 3 days See also: https://redmine.pfsense.org/issues/14804 Sponsored by: Rubicon Communications, LLC ("Netgate") --- sys/netpfil/pf/pf.c | 9 ++-- tests/sys/netpfil/pf/pfsync.sh | 96 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 101 insertions(+), 4 deletions(-) diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c index 3e1c8d32add9..fae0bd2854f9 100644 --- a/sys/netpfil/pf/pf.c +++ b/sys/netpfil/pf/pf.c @@ -6978,7 +6978,7 @@ pf_route(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, } else { ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; /* If pfsync'd */ - if (ifp == NULL) + if (ifp == NULL && r->rpool.cur != NULL) ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; PF_STATE_UNLOCK(s); @@ -7035,9 +7035,10 @@ pf_route(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, s->rt_addr.v4.s_addr; ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; /* If pfsync'd */ - if (ifp == NULL) + if (ifp == NULL && r->rpool.cur != NULL) { ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; + } PF_STATE_UNLOCK(s); } @@ -7191,7 +7192,7 @@ pf_route6(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, } else { ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; /* If pfsync'd */ - if (ifp == NULL) + if (ifp == NULL && r->rpool.cur != NULL) ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; PF_STATE_UNLOCK(s); @@ -7249,7 +7250,7 @@ pf_route6(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, &s->rt_addr, AF_INET6); ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; /* If pfsync'd */ - if (ifp == NULL) + if (ifp == NULL && r->rpool.cur != NULL) ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; } diff --git a/tests/sys/netpfil/pf/pfsync.sh b/tests/sys/netpfil/pf/pfsync.sh index 80b81205b59d..5d30f5b44888 100644 --- a/tests/sys/netpfil/pf/pfsync.sh +++ b/tests/sys/netpfil/pf/pfsync.sh @@ -826,6 +826,101 @@ basic_ipv6_cleanup() pfsynct_cleanup } +atf_test_case "route_to" "cleanup" +route_to_head() +{ + atf_set descr 'Test route-to with default rule' + atf_set require.user root + atf_set require.progs scapy +} + +route_to_body() +{ + pfsynct_init + + epair_sync=$(vnet_mkepair) + epair_one=$(vnet_mkepair) + epair_two=$(vnet_mkepair) + epair_out_one=$(vnet_mkepair) + epair_out_two=$(vnet_mkepair) + + vnet_mkjail one ${epair_one}a ${epair_sync}a ${epair_out_one}a + vnet_mkjail two ${epair_two}a ${epair_sync}b ${epair_out_two}a + + # pfsync interface + jexec one ifconfig ${epair_sync}a 192.0.2.1/24 up + jexec one ifconfig ${epair_one}a 198.51.100.1/24 up + jexec one ifconfig ${epair_out_one}a 203.0.113.1/24 up + jexec one ifconfig ${epair_out_one}a name outif + jexec one sysctl net.inet.ip.forwarding=1 + jexec one arp -s 203.0.113.254 00:01:02:03:04:05 + jexec one ifconfig pfsync0 \ + syncdev ${epair_sync}a \ + maxupd 1 \ + up + + jexec two ifconfig ${epair_sync}b 192.0.2.2/24 up + jexec two ifconfig ${epair_two}a 198.51.100.2/24 up + jexec two ifconfig ${epair_out_two}a 203.0.113.2/24 up + #jexec two ifconfig ${epair_out_two}a name outif + jexec two sysctl net.inet.ip.forwarding=1 + jexec two arp -s 203.0.113.254 00:01:02:03:04:05 + jexec two ifconfig pfsync0 \ + syncdev ${epair_sync}b \ + maxupd 1 \ + up + + # Enable pf! + jexec one pfctl -e + pft_set_rules one \ + "set skip on ${epair_sync}a" \ + "pass out route-to (outif 203.0.113.254)" + jexec two pfctl -e + + # Make sure we have different rulesets so the synced state is associated with + # V_pf_default_rule + pft_set_rules two \ + "set skip on ${epair_sync}b" \ + "pass out route-to (outif 203.0.113.254)" \ + "pass out proto tcp" + + ifconfig ${epair_one}b 198.51.100.254/24 up + ifconfig ${epair_two}b 198.51.100.253/24 up + route add -net 203.0.113.0/24 198.51.100.1 + ifconfig ${epair_two}b up + ifconfig ${epair_out_one}b up + ifconfig ${epair_out_two}b up + + atf_check -s exit:0 env PYTHONPATH=${common_dir} \ + ${common_dir}/pft_ping.py \ + --sendif ${epair_one}b \ + --fromaddr 198.51.100.254 \ + --to 203.0.113.254 \ + --recvif ${epair_out_one}b + + # Allow time for sync + ifconfig ${epair_one}b inet 198.51.100.254 -alias + route del -net 203.0.113.0/24 198.51.100.1 + route add -net 203.0.113.0/24 198.51.100.2 + + sleep 2 + + # Now try to trigger the state on the other pfsync member + env PYTHONPATH=${common_dir} \ + ${common_dir}/pft_ping.py \ + --sendif ${epair_two}b \ + --fromaddr 198.51.100.254 \ + --to 203.0.113.254 \ + --recvif ${epair_out_two}b + + true +} + +route_to_cleanup() +{ + pfsynct_cleanup +} + atf_init_test_cases() { atf_add_test_case "basic" @@ -838,4 +933,5 @@ atf_init_test_cases() atf_add_test_case "timeout" atf_add_test_case "basic_ipv6_unicast" atf_add_test_case "basic_ipv6" + atf_add_test_case "route_to" }
