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 } 152