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Diffstat (limited to 'slirp2/cksum.c')
| -rw-r--r-- | slirp2/cksum.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/slirp2/cksum.c b/slirp2/cksum.c deleted file mode 100644 index 9474b9e..0000000 --- a/slirp2/cksum.c +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Copyright (c) 1988, 1992, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)in_cksum.c 8.1 (Berkeley) 6/10/93 - * in_cksum.c,v 1.2 1994/08/02 07:48:16 davidg Exp - */ - -#include <slirp.h> - -/* - * Checksum routine for Internet Protocol family headers (Portable Version). - * - * This routine is very heavily used in the network - * code and should be modified for each CPU to be as fast as possible. - * - * XXX Since we will never span more than 1 mbuf, we can optimise this - */ - -#define ADDCARRY(x) (x > 65535 ? x -= 65535 : x) -#define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1]; ADDCARRY(sum);} - -int cksum(MBuf m, int len) -{ - register u_int16_t *w; - register int sum = 0; - register int mlen = 0; - int byte_swapped = 0; - - union { - u_int8_t c[2]; - u_int16_t s; - } s_util; - union { - u_int16_t s[2]; - u_int32_t l; - } l_util; - - if (m->m_len == 0) - goto cont; - w = MBUF_TO(m, u_int16_t *); - - mlen = m->m_len; - - if (len < mlen) - mlen = len; - len -= mlen; - /* - * Force to even boundary. - */ - if ((1 & (long) w) && (mlen > 0)) { - REDUCE; - sum <<= 8; - s_util.c[0] = *(u_int8_t *)w; - w = (u_int16_t *)((int8_t *)w + 1); - mlen--; - byte_swapped = 1; - } - /* - * Unroll the loop to make overhead from - * branches &c small. - */ - while ((mlen -= 32) >= 0) { - sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3]; - sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7]; - sum += w[8]; sum += w[9]; sum += w[10]; sum += w[11]; - sum += w[12]; sum += w[13]; sum += w[14]; sum += w[15]; - w += 16; - } - mlen += 32; - while ((mlen -= 8) >= 0) { - sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3]; - w += 4; - } - mlen += 8; - if (mlen == 0 && byte_swapped == 0) - goto cont; - REDUCE; - while ((mlen -= 2) >= 0) { - sum += *w++; - } - - if (byte_swapped) { - REDUCE; - sum <<= 8; - byte_swapped = 0; - if (mlen == -1) { - s_util.c[1] = *(u_int8_t *)w; - sum += s_util.s; - mlen = 0; - } else - - mlen = -1; - } else if (mlen == -1) - s_util.c[0] = *(u_int8_t *)w; - -cont: -#ifdef DEBUG - if (len) { - DEBUG_ERROR((dfd, "cksum: out of data\n")); - DEBUG_ERROR((dfd, " len = %d\n", len)); - } -#endif - if (mlen == -1) { - /* The last mbuf has odd # of bytes. Follow the - standard (the odd byte may be shifted left by 8 bits - or not as determined by endian-ness of the machine) */ - s_util.c[1] = 0; - sum += s_util.s; - } - REDUCE; - return (~sum & 0xffff); -} |