b4d758a0cc
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
146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
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* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* a) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* b) Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* c) Neither the name of Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_sctp.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/gsb_crc32.h>
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#include <sys/mbuf.h>
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#include <netinet/sctp.h>
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#include <netinet/sctp_crc32.h>
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#if defined(SCTP) || defined(SCTP_SUPPORT)
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#include <netinet/sctp_os.h>
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#include <netinet/sctp_pcb.h>
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#endif
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static uint32_t
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sctp_finalize_crc32c(uint32_t crc32c)
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{
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uint32_t result;
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#if BYTE_ORDER == BIG_ENDIAN
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uint8_t byte0, byte1, byte2, byte3;
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#endif
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/* Complement the result */
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result = ~crc32c;
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#if BYTE_ORDER == BIG_ENDIAN
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/*
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* For BIG-ENDIAN platforms the result is in little-endian form. So
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* we must swap the bytes to return the result in network byte
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* order.
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*/
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byte0 = result & 0x000000ff;
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byte1 = (result >> 8) & 0x000000ff;
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byte2 = (result >> 16) & 0x000000ff;
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byte3 = (result >> 24) & 0x000000ff;
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crc32c = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
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#else
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/*
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* For LITTLE ENDIAN platforms the result is in already in network
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* byte order.
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*/
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crc32c = result;
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#endif
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return (crc32c);
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}
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static int
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sctp_calculate_cksum_cb(void *arg, void *data, u_int len)
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{
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uint32_t *basep;
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basep = arg;
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*basep = calculate_crc32c(*basep, data, len);
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return (0);
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}
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/*
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* Compute the SCTP checksum in network byte order for a given mbuf chain m
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* which contains an SCTP packet starting at offset.
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* Since this function is also called by ipfw, don't assume that
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* it is compiled on a kernel with SCTP support.
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*/
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uint32_t
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sctp_calculate_cksum(struct mbuf *m, uint32_t offset)
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{
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uint32_t base;
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int len;
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M_ASSERTPKTHDR(m);
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KASSERT(offset < m->m_pkthdr.len,
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("%s: invalid offset %u into mbuf %p", __func__, offset, m));
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base = 0xffffffff;
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len = m->m_pkthdr.len - offset;
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(void)m_apply(m, offset, len, sctp_calculate_cksum_cb, &base);
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return (sctp_finalize_crc32c(base));
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}
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#if defined(SCTP) || defined(SCTP_SUPPORT)
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VNET_DEFINE(struct sctp_base_info, system_base_info);
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/*
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* Compute and insert the SCTP checksum in network byte order for a given
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* mbuf chain m which contains an SCTP packet starting at offset.
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*/
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void
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sctp_delayed_cksum(struct mbuf *m, uint32_t offset)
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{
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uint32_t checksum;
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checksum = sctp_calculate_cksum(m, offset);
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SCTP_STAT_DECR(sctps_sendhwcrc);
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SCTP_STAT_INCR(sctps_sendswcrc);
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offset += offsetof(struct sctphdr, checksum);
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if (offset + sizeof(uint32_t) > (uint32_t)(m->m_pkthdr.len)) {
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#ifdef INVARIANTS
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panic("sctp_delayed_cksum(): m->m_pkthdr.len: %d, offset: %u.",
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m->m_pkthdr.len, offset);
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#else
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SCTP_PRINTF("sctp_delayed_cksum(): m->m_pkthdr.len: %d, offset: %u.\n",
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m->m_pkthdr.len, offset);
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#endif
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return;
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}
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m_copyback(m, (int)offset, (int)sizeof(uint32_t), (caddr_t)&checksum);
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}
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#endif
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