Annotation of sys/lib/libsa/ether.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ether.c,v 1.7 2003/08/11 06:23:09 deraadt Exp $ */
! 2: /* $NetBSD: ether.c,v 1.8 1996/10/13 02:29:00 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1992 Regents of the University of California.
! 6: * All rights reserved.
! 7: *
! 8: * This software was developed by the Computer Systems Engineering group
! 9: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 10: * contributed to Berkeley.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the University of
! 23: * California, Lawrence Berkeley Laboratory and its contributors.
! 24: * 4. Neither the name of the University nor the names of its contributors
! 25: * may be used to endorse or promote products derived from this software
! 26: * without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 29: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 30: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 31: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 32: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 33: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 34: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 35: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 36: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 37: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 38: * SUCH DAMAGE.
! 39: *
! 40: * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
! 41: */
! 42:
! 43: #include <sys/param.h>
! 44: #include <sys/socket.h>
! 45:
! 46: #include <net/if.h>
! 47:
! 48: #include <netinet/in.h>
! 49: #include <netinet/if_ether.h>
! 50: #include <netinet/in_systm.h>
! 51: #include <netinet/ip.h>
! 52:
! 53: #include "stand.h"
! 54: #include "net.h"
! 55: #include "netif.h"
! 56:
! 57: /* Caller must leave room for ethernet header in front!! */
! 58: ssize_t
! 59: sendether(d, pkt, len, dea, etype)
! 60: struct iodesc *d;
! 61: void *pkt;
! 62: size_t len;
! 63: u_char *dea;
! 64: int etype;
! 65: {
! 66: ssize_t n;
! 67: struct ether_header *eh;
! 68:
! 69: #ifdef ETHER_DEBUG
! 70: if (debug)
! 71: printf("sendether: called\n");
! 72: #endif
! 73:
! 74: eh = (struct ether_header *)pkt - 1;
! 75: len += sizeof(*eh);
! 76:
! 77: MACPY(d->myea, eh->ether_shost); /* by byte */
! 78: MACPY(dea, eh->ether_dhost); /* by byte */
! 79: eh->ether_type = htons(etype);
! 80:
! 81: n = netif_put(d, eh, len);
! 82: if (n < 0 || (size_t)n < sizeof(*eh))
! 83: return (-1);
! 84:
! 85: n -= sizeof(*eh);
! 86: return (n);
! 87: }
! 88:
! 89: /*
! 90: * Get a packet of any Ethernet type, with our address or
! 91: * the broadcast address. Save the Ether type in arg 5.
! 92: * NOTE: Caller must leave room for the Ether header.
! 93: */
! 94: ssize_t
! 95: readether(d, pkt, len, tleft, etype)
! 96: struct iodesc *d;
! 97: void *pkt;
! 98: size_t len;
! 99: time_t tleft;
! 100: u_int16_t *etype;
! 101: {
! 102: ssize_t n;
! 103: struct ether_header *eh;
! 104:
! 105: #ifdef ETHER_DEBUG
! 106: if (debug)
! 107: printf("readether: called\n");
! 108: #endif
! 109:
! 110: eh = (struct ether_header *)pkt - 1;
! 111: len += sizeof(*eh);
! 112:
! 113: n = netif_get(d, eh, len, tleft);
! 114: if (n < 0 || (size_t)n < sizeof(*eh))
! 115: return (-1);
! 116:
! 117: /* Validate Ethernet address. */
! 118: if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
! 119: bcmp(bcea, eh->ether_dhost, 6) != 0) {
! 120: #ifdef ETHER_DEBUG
! 121: if (debug)
! 122: printf("readether: not ours (ea=%s)\n",
! 123: ether_sprintf(eh->ether_dhost));
! 124: #endif
! 125: return (-1);
! 126: }
! 127: *etype = ntohs(eh->ether_type);
! 128:
! 129: n -= sizeof(*eh);
! 130: return (n);
! 131: }
! 132:
! 133: /*
! 134: * Convert Ethernet address to printable (loggable) representation.
! 135: */
! 136: static char digits[] = "0123456789abcdef";
! 137: char *
! 138: ether_sprintf(u_char *ap)
! 139: {
! 140: int i;
! 141: static char etherbuf[18];
! 142: char *cp = etherbuf;
! 143:
! 144: for (i = 0; i < 6; i++) {
! 145: *cp++ = digits[*ap >> 4];
! 146: *cp++ = digits[*ap++ & 0xf];
! 147: *cp++ = ':';
! 148: }
! 149: *--cp = 0;
! 150: return (etherbuf);
! 151: }
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