147 lines
4.3 KiB
C
147 lines
4.3 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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#ifdef SCTP
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#include <netinet/sctp_os.h>
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#include <netinet/sctp.h>
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#include <netinet/sctp_crc32.h>
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#include <netinet/sctp_pcb.h>
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#else
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <netinet/sctp_crc32.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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/*
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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 = 0xffffffff;
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while (offset > 0) {
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KASSERT(m != NULL, ("sctp_calculate_cksum, offset > length of mbuf chain"));
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if (offset < (uint32_t)m->m_len) {
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break;
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}
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offset -= m->m_len;
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m = m->m_next;
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}
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if (offset > 0) {
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base = calculate_crc32c(base,
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(unsigned char *)(m->m_data + offset),
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(unsigned int)(m->m_len - offset));
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m = m->m_next;
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}
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while (m != NULL) {
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base = calculate_crc32c(base,
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(unsigned char *)m->m_data,
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(unsigned int)m->m_len);
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m = m->m_next;
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}
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base = sctp_finalize_crc32c(base);
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return (base);
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}
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#ifdef SCTP
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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_len)) {
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#ifdef INVARIANTS
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panic("sctp_delayed_cksum(): m->m_len: %d, offset: %u.",
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m->m_len, offset);
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#else
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SCTP_PRINTF("sctp_delayed_cksum(): m->m_len: %d, offset: %u.\n",
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m->m_len, offset);
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#endif
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return;
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}
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*(uint32_t *)(m->m_data + offset) = checksum;
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}
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#endif
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