From owner-dev-commits-src-main@freebsd.org Fri Apr 30 08:45:50 2021 Return-Path: Delivered-To: dev-commits-src-main@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id A4AA05F692A; Fri, 30 Apr 2021 08:45:50 +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 4FWmDG4GLNz4WWN; Fri, 30 Apr 2021 08:45:50 +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 850AF2933F; Fri, 30 Apr 2021 08:45:50 +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 13U8joUq087340; Fri, 30 Apr 2021 08:45:50 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 13U8joDK087339; Fri, 30 Apr 2021 08:45:50 GMT (envelope-from git) Date: Fri, 30 Apr 2021 08:45:50 GMT Message-Id: <202104300845.13U8joDK087339@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Kristof Provost Subject: git: 055c55abefbe - main - pf: Fix IP checksum on reassembly MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kp X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 055c55abefbe19fe46a56894595af9c9dad7678c Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Apr 2021 08:45:50 -0000 The branch main has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=055c55abefbe19fe46a56894595af9c9dad7678c commit 055c55abefbe19fe46a56894595af9c9dad7678c Author: Kristof Provost AuthorDate: 2021-04-28 10:56:06 +0000 Commit: Kristof Provost CommitDate: 2021-04-30 06:19:46 +0000 pf: Fix IP checksum on reassembly If we reassemble a packet we modify the IP header (to set the length and remove the fragment offset information), but we failed to update the checksum. On certain setups (mostly where we did not re-fragment again afterwards) this could lead to us sending out packets with incorrect checksums. PR: 255432 MFC after: 1 week Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D30026 --- sys/netpfil/pf/pf_norm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/sys/netpfil/pf/pf_norm.c b/sys/netpfil/pf/pf_norm.c index d7310c7bccb4..6de1efa8ff84 100644 --- a/sys/netpfil/pf/pf_norm.c +++ b/sys/netpfil/pf/pf_norm.c @@ -794,7 +794,11 @@ pf_reassemble(struct mbuf **m0, struct ip *ip, int dir, u_short *reason) } ip = mtod(m, struct ip *); + ip->ip_sum = pf_cksum_fixup(ip->ip_sum, ip->ip_len, + htons(hdrlen + total), 0); ip->ip_len = htons(hdrlen + total); + ip->ip_sum = pf_cksum_fixup(ip->ip_sum, ip->ip_off, + ip->ip_off & ~(IP_MF|IP_OFFMASK), 0); ip->ip_off &= ~(IP_MF|IP_OFFMASK); if (hdrlen + total > IP_MAXPACKET) {