/* $OpenBSD: in4_cksum.c,v 1.8 2022/02/01 15:30:10 miod Exp $ */ /* $NetBSD: in4_cksum.c,v 1.5 2003/10/13 14:22:20 agc Exp $ */ /* * Copyright (c) 1995 Matthew R. Green. * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * 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, and its contributors. * * 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. 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) 6/11/93 */ /* * Copyright (c) 2001 Eduardo Horvath. * Copyright (c) 1995 Zubin Dittia. * Copyright (c) 1994, 1998 Charles M. Hannum. * * 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, and its contributors. * * 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) 6/11/93 */ #include #include #include #include #include #include #include extern int in_cksum_internal(struct mbuf *, int len, int offset, int sum); int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len) { u_int sum = 0; struct ipovly ipov; /* * Declare three temporary registers for use by the asm code. We * allow the compiler to pick which specific machine registers to * use, instead of hard-coding this in the asm code. */ u_int tmp1, tmp2; if (nxt != 0) { /* pseudo header */ ipov.ih_src = mtod(m, struct ip *)->ip_src; ipov.ih_dst = mtod(m, struct ip *)->ip_dst; sum = ((u_int)nxt << 16) | htons(len); /* assumes sizeof(ipov) == 20 */ __asm volatile( " lduw [%4 + 12], %1; " " lduw [%4 + 16], %2; " " add %0, %1, %0; " " add %0, %2, %0; " " srlx %0, 32, %2; " " add %0, %2, %0; " : "=r" (sum), "=&r" (tmp1), "=&r" (tmp2) : "0" (sum), "r" (&ipov)); } /* skip unnecessary part */ while (m && off > 0) { if (m->m_len > off) break; off -= m->m_len; m = m->m_next; } return (in_cksum_internal(m, len, off, sum)); }