From nobody Tue Nov 16 18:52:44 2021 X-Original-To: dev-commits-src-main@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 13808189E104; Tue, 16 Nov 2021 18:52:45 +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 4HtwDD4Dy8z4Z9c; Tue, 16 Nov 2021 18:52:44 +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 5C4B312C20; Tue, 16 Nov 2021 18:52:44 +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 1AGIqi8n017917; Tue, 16 Nov 2021 18:52:44 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1AGIqi6F017916; Tue, 16 Nov 2021 18:52:44 GMT (envelope-from git) Date: Tue, 16 Nov 2021 18:52:44 GMT Message-Id: <202111161852.1AGIqi6F017916@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Mark Johnston Subject: git: b4d758a0cc54 - main - sctp: Use m_apply() to calcuate a checksum for an mbuf chain List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-main@freebsd.org X-BeenThere: dev-commits-src-main@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: b4d758a0cc54d991d2bdf7f697ec0b6b3fd6230d Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=b4d758a0cc54d991d2bdf7f697ec0b6b3fd6230d commit b4d758a0cc54d991d2bdf7f697ec0b6b3fd6230d Author: Mark Johnston AuthorDate: 2021-11-16 18:36:30 +0000 Commit: Mark Johnston CommitDate: 2021-11-16 18:36:30 +0000 sctp: Use m_apply() to calcuate a checksum for an mbuf chain m_apply() works on unmapped mbufs, so this will let us elide mb_unmapped_to_ext() calls preceding sctp_calculate_cksum() calls in the network stack. Modify sctp_calculate_cksum() to assume it's passed an mbuf header. This assumption appears to be true in practice, and we need to know the full length of the chain. No functional change intended. Reviewed by: tuexen, jhb MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32941 --- sys/netinet/sctp_crc32.c | 45 +++++++++++++++++++++------------------------ 1 file changed, 21 insertions(+), 24 deletions(-) diff --git a/sys/netinet/sctp_crc32.c b/sys/netinet/sctp_crc32.c index a36d36dc4861..97b881bb5062 100644 --- a/sys/netinet/sctp_crc32.c +++ b/sys/netinet/sctp_crc32.c @@ -80,6 +80,16 @@ sctp_finalize_crc32c(uint32_t crc32c) return (crc32c); } +static int +sctp_calculate_cksum_cb(void *arg, void *data, u_int len) +{ + uint32_t *basep; + + basep = arg; + *basep = calculate_crc32c(*basep, data, len); + return (0); +} + /* * Compute the SCTP checksum in network byte order for a given mbuf chain m * which contains an SCTP packet starting at offset. @@ -89,30 +99,17 @@ sctp_finalize_crc32c(uint32_t crc32c) uint32_t sctp_calculate_cksum(struct mbuf *m, uint32_t offset) { - uint32_t base = 0xffffffff; - - while (offset > 0) { - KASSERT(m != NULL, ("sctp_calculate_cksum, offset > length of mbuf chain")); - if (offset < (uint32_t)m->m_len) { - break; - } - offset -= m->m_len; - m = m->m_next; - } - if (offset > 0) { - base = calculate_crc32c(base, - (unsigned char *)(m->m_data + offset), - (unsigned int)(m->m_len - offset)); - m = m->m_next; - } - while (m != NULL) { - base = calculate_crc32c(base, - (unsigned char *)m->m_data, - (unsigned int)m->m_len); - m = m->m_next; - } - base = sctp_finalize_crc32c(base); - return (base); + uint32_t base; + int len; + + M_ASSERTPKTHDR(m); + KASSERT(offset < m->m_pkthdr.len, + ("%s: invalid offset %u into mbuf %p", __func__, offset, m)); + + base = 0xffffffff; + len = m->m_pkthdr.len - offset; + (void)m_apply(m, offset, len, sctp_calculate_cksum_cb, &base); + return (sctp_finalize_crc32c(base)); } #if defined(SCTP) || defined(SCTP_SUPPORT)