1/* $FreeBSD: head/sys/netinet6/in6_cksum.c 62587 2000-07-04 16:35:15Z itojun $ */
2/* $KAME: in6_cksum.c,v 1.6 2000/03/25 07:23:43 sumikawa Exp $ */
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright

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23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33/*
34 * Copyright (c) 1988, 1992, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions

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64 *
65 * @(#)in_cksum.c 8.1 (Berkeley) 6/10/93
66 */
67
68#include <sys/param.h>
69#include <sys/mbuf.h>
70#include <sys/systm.h>
71#include <netinet/in.h>
72#include
73
74#include <net/net_osdep.h>
75
76/*
77 * Checksum routine for Internet Protocol family headers (Portable Version).
78 *
79 * This routine is very heavily used in the network
80 * code and should be modified for each CPU to be as fast as possible.
81 */
82
83#define ADDCARRY(x) (x > 65535 ? x -= 65535 : x)
84#define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1]; ADDCARRY(sum);}
85
86static union {
87 u_int16_t phs[4];
88 struct {
89 u_int32_t ph_len;
90 u_int8_t ph_zero[3];
91 u_int8_t ph_nxt;
92 } ph;
93} uph;
94
95/*
96 * m MUST contain a continuous IP6 header.
97 * off is a offset where TCP/UDP/ICMP6 header starts.
98 * len is a total length of a transport segment.
99 * (e.g. TCP header + TCP payload)
100 */
101
102int
103in6_cksum(m, nxt, off, len)
104 register struct mbuf *m;
105 u_int8_t nxt;
106 u_int32_t off, len;
107{
108 register u_int16_t *w;
109 register int sum = 0;
110 register int mlen = 0;
111 int byte_swapped = 0;
112#if 0
113 int srcifid = 0, dstifid = 0;
114#endif
115 struct ip6_hdr *ip6;
116
117 union {
118 u_int8_t c[2];
119 u_int16_t s;
120 } s_util;
121 union {
122 u_int16_t s[2];

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128 panic("in6_cksum: mbuf len (%d) < off+len (%d+%d)\n",
129 m->m_pkthdr.len, off, len);
130 }
131
132 /*
133 * First create IP6 pseudo header and calculate a summary.
134 */
135 ip6 = mtod(m, struct ip6_hdr *);
136#if 0
137 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
138 srcifid = ip6->ip6_src.s6_addr16[1];
139 ip6->ip6_src.s6_addr16[1] = 0;
140 }
141 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
142 dstifid = ip6->ip6_dst.s6_addr16[1];
143 ip6->ip6_dst.s6_addr16[1] = 0;
144 }
145#endif
146 w = (u_int16_t *)&ip6->ip6_src;
147 uph.ph.ph_len = htonl(len);
148 uph.ph.ph_nxt = nxt;
149
150 /* IPv6 source address */
151 sum += w[0];
152 if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
153 sum += w[1];

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158 if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
159 sum += w[9];
160 sum += w[10]; sum += w[11]; sum += w[12]; sum += w[13];
161 sum += w[14]; sum += w[15];
162 /* Payload length and upper layer identifier */
163 sum += uph.phs[0]; sum += uph.phs[1];
164 sum += uph.phs[2]; sum += uph.phs[3];
165
166#if 0
167 if (srcifid)
168 ip6->ip6_src.s6_addr16[1] = srcifid;
169 if (dstifid)
170 ip6->ip6_dst.s6_addr16[1] = dstifid;
171#endif
172 /*
173 * Secondly calculate a summary of the first mbuf excluding offset.
174 */
175 while (m != NULL && off > 0) {
176 if (m->m_len <= off)
177 off -= m->m_len;
178 else
179 break;

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