git: 2da98eef1f35 - main - pf: fix icmp-in-icmp state lookup
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Date: Tue, 13 Aug 2024 11:27:20 UTC
The branch main has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=2da98eef1f352c496ffd458b4c68ddee972bb903 commit 2da98eef1f352c496ffd458b4c68ddee972bb903 Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2024-08-12 14:07:35 +0000 Commit: Kristof Provost <kp@FreeBSD.org> CommitDate: 2024-08-13 11:23:17 +0000 pf: fix icmp-in-icmp state lookup In 534ee17e6 pf state checking for ICMP(v6) was made stricter. This change failed to correctly set the pf_pdesc for ICMP-in-ICMP lookups, resulting in ICMP error packets potentially being dropped incorrectly. Specially, it copied the ICMP header into a separate variable, not into the pf_pdesc. Populate the required pf_pdesc fields for the embedded ICMP packet's state lookup. PR: 280701 MFC after: 1 week Sponsored by: Rubicon Communications, LLC ("Netgate") --- sys/netpfil/pf/pf.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c index 0a6f6b4d2c10..a2b152cebc77 100644 --- a/sys/netpfil/pf/pf.c +++ b/sys/netpfil/pf/pf.c @@ -7133,9 +7133,9 @@ pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, } #ifdef INET case IPPROTO_ICMP: { - struct icmp iih; + struct icmp *iih = &pd2.hdr.icmp; - if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, + if (!pf_pull_hdr(m, off2, iih, ICMP_MINLEN, NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short i" @@ -7143,12 +7143,13 @@ pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, return (PF_DROP); } - icmpid = iih.icmp_id; - pf_icmp_mapping(&pd2, iih.icmp_type, + icmpid = iih->icmp_id; + pf_icmp_mapping(&pd2, iih->icmp_type, &icmp_dir, &multi, &virtual_id, &virtual_type); + pd2.dir = icmp_dir; ret = pf_icmp_state_lookup(&key, &pd2, state, m, - pd->dir, kif, virtual_id, virtual_type, + pd2.dir, kif, virtual_id, virtual_type, icmp_dir, &iidx, PF_ICMP_MULTI_NONE); if (ret >= 0) return (ret); @@ -7162,10 +7163,10 @@ pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || (virtual_type == htons(ICMP_ECHO) && - nk->port[iidx] != iih.icmp_id)) + nk->port[iidx] != iih->icmp_id)) pf_change_icmp(pd2.src, (virtual_type == htons(ICMP_ECHO)) ? - &iih.icmp_id : NULL, + &iih->icmp_id : NULL, daddr, &nk->addr[pd2.sidx], (virtual_type == htons(ICMP_ECHO)) ? nk->port[iidx] : 0, NULL, @@ -7181,7 +7182,7 @@ pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); - m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); + m_copyback(m, off2, ICMP_MINLEN, (caddr_t)iih); } return (PF_PASS); break; @@ -7189,9 +7190,9 @@ pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: { - struct icmp6_hdr iih; + struct icmp6_hdr *iih = &pd2.hdr.icmp6; - if (!pf_pull_hdr(m, off2, &iih, + if (!pf_pull_hdr(m, off2, iih, sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short " @@ -7199,8 +7200,10 @@ pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, return (PF_DROP); } - pf_icmp_mapping(&pd2, iih.icmp6_type, + pf_icmp_mapping(&pd2, iih->icmp6_type, &icmp_dir, &multi, &virtual_id, &virtual_type); + + pd2.dir = icmp_dir; ret = pf_icmp_state_lookup(&key, &pd2, state, m, pd->dir, kif, virtual_id, virtual_type, icmp_dir, &iidx, PF_ICMP_MULTI_NONE); @@ -7228,10 +7231,10 @@ pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || ((virtual_type == htons(ICMP6_ECHO_REQUEST)) && - nk->port[pd2.sidx] != iih.icmp6_id)) + nk->port[pd2.sidx] != iih->icmp6_id)) pf_change_icmp(pd2.src, (virtual_type == htons(ICMP6_ECHO_REQUEST)) - ? &iih.icmp6_id : NULL, + ? &iih->icmp6_id : NULL, daddr, &nk->addr[pd2.sidx], (virtual_type == htons(ICMP6_ECHO_REQUEST)) ? nk->port[iidx] : 0, NULL, @@ -7249,7 +7252,7 @@ pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, (caddr_t)&pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); m_copyback(m, off2, sizeof(struct icmp6_hdr), - (caddr_t)&iih); + (caddr_t)iih); } return (PF_PASS); break;