2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
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9 * modification, are permitted provided that the following conditions are met:
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12 * this list of conditions and the following disclaimer.
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19 * contributors may be used to endorse or promote products derived
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35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/gsb_crc32.h>
45 #include <netinet/sctp.h>
46 #include <netinet/sctp_crc32.h>
47 #if defined(SCTP) || defined(SCTP_SUPPORT)
48 #include <netinet/sctp_os.h>
49 #include <netinet/sctp_pcb.h>
53 sctp_finalize_crc32c(uint32_t crc32c)
56 #if BYTE_ORDER == BIG_ENDIAN
57 uint8_t byte0, byte1, byte2, byte3;
60 /* Complement the result */
62 #if BYTE_ORDER == BIG_ENDIAN
64 * For BIG-ENDIAN platforms the result is in little-endian form. So
65 * we must swap the bytes to return the result in network byte
68 byte0 = result & 0x000000ff;
69 byte1 = (result >> 8) & 0x000000ff;
70 byte2 = (result >> 16) & 0x000000ff;
71 byte3 = (result >> 24) & 0x000000ff;
72 crc32c = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
75 * For LITTLE ENDIAN platforms the result is in already in network
84 sctp_calculate_cksum_cb(void *arg, void *data, u_int len)
89 *basep = calculate_crc32c(*basep, data, len);
94 * Compute the SCTP checksum in network byte order for a given mbuf chain m
95 * which contains an SCTP packet starting at offset.
96 * Since this function is also called by ipfw, don't assume that
97 * it is compiled on a kernel with SCTP support.
100 sctp_calculate_cksum(struct mbuf *m, uint32_t offset)
106 KASSERT(offset < m->m_pkthdr.len,
107 ("%s: invalid offset %u into mbuf %p", __func__, offset, m));
110 len = m->m_pkthdr.len - offset;
111 (void)m_apply(m, offset, len, sctp_calculate_cksum_cb, &base);
112 return (sctp_finalize_crc32c(base));
115 #if defined(SCTP) || defined(SCTP_SUPPORT)
117 VNET_DEFINE(struct sctp_base_info, system_base_info);
120 * Compute and insert the SCTP checksum in network byte order for a given
121 * mbuf chain m which contains an SCTP packet starting at offset.
124 sctp_delayed_cksum(struct mbuf *m, uint32_t offset)
128 checksum = sctp_calculate_cksum(m, offset);
129 SCTP_STAT_DECR(sctps_sendhwcrc);
130 SCTP_STAT_INCR(sctps_sendswcrc);
131 offset += offsetof(struct sctphdr, checksum);
133 if (offset + sizeof(uint32_t) > (uint32_t)(m->m_pkthdr.len)) {
135 panic("sctp_delayed_cksum(): m->m_pkthdr.len: %d, offset: %u.",
136 m->m_pkthdr.len, offset);
138 SCTP_PRINTF("sctp_delayed_cksum(): m->m_pkthdr.len: %d, offset: %u.\n",
139 m->m_pkthdr.len, offset);
143 m_copyback(m, (int)offset, (int)sizeof(uint32_t), (caddr_t)&checksum);