Date: Mon, 17 Nov 2025 15:48:18 GMT From: Kristof Provost <kp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: c12013f5bb38 - main - pf: fix udp_mapping cleanup Message-ID: <202511171548.5AHFmIUR012605@gitrepo.freebsd.org>
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The branch main has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=c12013f5bb3819e64499f02ecd199a635003c7ce commit c12013f5bb3819e64499f02ecd199a635003c7ce Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2025-11-13 13:54:54 +0000 Commit: Kristof Provost <kp@FreeBSD.org> CommitDate: 2025-11-17 15:48:04 +0000 pf: fix udp_mapping cleanup If we fail to obtain a new source port (pf_get_sport()) while we've created a udp_mapping (for 'endpoint independent nat') we must free the udp_mapping in pf_get_sport(). Otherwise the calling function will call pf_udp_mapping_release(). This will then attempt to remove the udp_mapping from a list it's not in, and crash. Actually free the udp_mapping in all failure cases. While here sprinkle in a few more assertions to ensure we don't forget leak udp_mappings and add a test case to provoke this problem. Reviewed by: thj MFC after: 1 week See also: https://redmine.pfsense.org/issues/16517 Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D53737 --- sys/netpfil/pf/pf_lb.c | 29 ++++++++++++++++++++++------- tests/sys/netpfil/pf/nat.sh | 30 ++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+), 7 deletions(-) diff --git a/sys/netpfil/pf/pf_lb.c b/sys/netpfil/pf/pf_lb.c index 7aeb8266ca8c..3227d2906fb5 100644 --- a/sys/netpfil/pf/pf_lb.c +++ b/sys/netpfil/pf/pf_lb.c @@ -301,9 +301,8 @@ pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, bzero(&init_addr, sizeof(init_addr)); - if (udp_mapping) { - MPASS(*udp_mapping == NULL); - } + MPASS(udp_mapping == NULL || + *udp_mapping == NULL); /* * If we are UDP and have an existing mapping we can get source port @@ -354,16 +353,22 @@ pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, if (pd->ndport == htons(ICMP_ECHO)) { low = 1; high = 65535; - } else + } else { + MPASS(udp_mapping == NULL || + *udp_mapping == NULL); return (0); /* Don't try to modify non-echo ICMP */ + } } #ifdef INET6 if (pd->proto == IPPROTO_ICMPV6) { if (pd->ndport == htons(ICMP6_ECHO_REQUEST)) { low = 1; high = 65535; - } else + } else { + MPASS(udp_mapping == NULL || + *udp_mapping == NULL); return (0); /* Don't try to modify non-echo ICMP */ + } } #endif /* INET6 */ @@ -386,6 +391,8 @@ pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, */ if (pd->proto == IPPROTO_SCTP) { key.port[sidx] = pd->nsport; + MPASS(udp_mapping == NULL || + *udp_mapping == NULL); if (!pf_find_state_all_exists(&key, dir)) { *nport = pd->nsport; return (0); @@ -400,6 +407,8 @@ pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, */ key.port[sidx] = pd->nsport; if (!pf_find_state_all_exists(&key, dir)) { + MPASS(udp_mapping == NULL || + *udp_mapping == NULL); *nport = pd->nsport; return (0); } @@ -413,6 +422,8 @@ pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, return (0); } } else { + MPASS(udp_mapping == NULL || + *udp_mapping == NULL); *nport = htons(low); return (0); } @@ -440,6 +451,8 @@ pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, key.port[sidx] = htons(tmp); if (!pf_find_state_all_exists(&key, dir)) { *nport = htons(tmp); + MPASS(udp_mapping == NULL || + *udp_mapping == NULL); return (0); } } @@ -457,6 +470,8 @@ pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, } else { key.port[sidx] = htons(tmp); if (!pf_find_state_all_exists(&key, dir)) { + MPASS(udp_mapping == NULL || + *udp_mapping == NULL); *nport = htons(tmp); return (0); } @@ -473,13 +488,13 @@ pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, */ if (pf_map_addr_sn(pd->naf, r, &pd->nsaddr, naddr, &(pd->naf), NULL, &init_addr, rpool, sn_type)) - return (1); + goto failed; break; case PF_POOL_NONE: case PF_POOL_SRCHASH: case PF_POOL_BITMASK: default: - return (1); + goto failed; } } while (! PF_AEQ(&init_addr, naddr, pd->naf) ); diff --git a/tests/sys/netpfil/pf/nat.sh b/tests/sys/netpfil/pf/nat.sh index 0824671fa0f1..788eacdc3369 100644 --- a/tests/sys/netpfil/pf/nat.sh +++ b/tests/sys/netpfil/pf/nat.sh @@ -260,6 +260,35 @@ endpoint_independent_compat_cleanup() rm -f server2.out } +atf_test_case "endpoint_independent_exhaust" "cleanup" +endpoint_independent_exhaust_head() +{ + atf_set descr 'Test that a client behind NAT gets the same external IP:port for different servers' + atf_set require.user root +} + +endpoint_independent_exhaust_body() +{ + endpoint_independent_setup # Sets ${epair_…} variables + + endpoint_independent_common \ + "nat on ${epair_nat}a inet from ! (${epair_nat}a) to any -> (${epair_nat}a)" \ + "nat on ${epair_nat}a inet from ! (${epair_nat}a) to any -> (${epair_nat}a) port 3000:3001 sticky-address endpoint-independent" + + # Exhaust the available nat ports + for i in $(seq 1 10); do + echo "ping" | jexec client nc -u 198.51.100.32 1234 -w 0 + echo "ping" | jexec client nc -u 198.51.100.22 1234 -w 0 + done +} + +endpoint_independent_exhaust_cleanup() +{ + pft_cleanup + rm -f server1.out + rm -f server2.out +} + atf_test_case "endpoint_independent_pass" "cleanup" endpoint_independent_pass_head() { @@ -900,6 +929,7 @@ atf_init_test_cases() atf_add_test_case "exhaust" atf_add_test_case "nested_anchor" atf_add_test_case "endpoint_independent_compat" + atf_add_test_case "endpoint_independent_exhaust" atf_add_test_case "endpoint_independent_pass" atf_add_test_case "nat6_nolinklocal" atf_add_test_case "empty_table_source_hash"help
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