1 /* $NetBSD: ether.c,v 1.15 2000/03/30 12:19:48 augustss Exp $ */ 2 3 /* 4 * Copyright (c) 1992 Regents of the University of California. 5 * All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Lawrence Berkeley Laboratory and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL) 40 */ 41 42 #include <sys/param.h> 43 #include <sys/socket.h> 44 #ifdef _STANDALONE 45 #include <lib/libkern/libkern.h> 46 #else 47 #include <string.h> 48 #endif 49 50 #include <net/if.h> 51 #include <net/if_ether.h> 52 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/ip.h> 56 57 #include "stand.h" 58 #include "net.h" 59 #include "netif.h" 60 61 /* Caller must leave room for ethernet header in front!! */ 62 ssize_t 63 sendether(d, pkt, len, dea, etype) 64 struct iodesc *d; 65 void *pkt; 66 size_t len; 67 u_char *dea; 68 int etype; 69 { 70 ssize_t n; 71 struct ether_header *eh; 72 73 #ifdef ETHER_DEBUG 74 if (debug) 75 printf("sendether: called\n"); 76 #endif 77 78 eh = (struct ether_header *)pkt - 1; 79 len += sizeof(*eh); 80 81 MACPY(d->myea, eh->ether_shost); /* by byte */ 82 MACPY(dea, eh->ether_dhost); /* by byte */ 83 eh->ether_type = htons(etype); 84 85 n = netif_put(d, eh, len); 86 if (n == -1 || n < sizeof(*eh)) 87 return (-1); 88 89 n -= sizeof(*eh); 90 return (n); 91 } 92 93 /* 94 * Get a packet of any Ethernet type, with our address or 95 * the broadcast address. Save the Ether type in arg 5. 96 * NOTE: Caller must leave room for the Ether header. 97 */ 98 ssize_t 99 readether(d, pkt, len, tleft, etype) 100 struct iodesc *d; 101 void *pkt; 102 size_t len; 103 time_t tleft; 104 u_int16_t *etype; 105 { 106 ssize_t n; 107 struct ether_header *eh; 108 109 #ifdef ETHER_DEBUG 110 if (debug) 111 printf("readether: called\n"); 112 #endif 113 114 eh = (struct ether_header *)pkt - 1; 115 len += sizeof(*eh); 116 117 n = netif_get(d, eh, len, tleft); 118 if (n == -1 || n < sizeof(*eh)) 119 return (-1); 120 121 /* Validate Ethernet address. */ 122 if (bcmp(d->myea, eh->ether_dhost, 6) != 0 && 123 bcmp(bcea, eh->ether_dhost, 6) != 0) { 124 #ifdef ETHER_DEBUG 125 if (debug) 126 printf("readether: not ours (ea=%s)\n", 127 ether_sprintf(eh->ether_dhost)); 128 #endif 129 return (-1); 130 } 131 *etype = ntohs(eh->ether_type); 132 133 n -= sizeof(*eh); 134 return (n); 135 } 136 137 /* 138 * Convert Ethernet address to printable (loggable) representation. 139 */ 140 static char digits[] = "0123456789abcdef"; 141 char * 142 ether_sprintf(ap) 143 u_char *ap; 144 { 145 int i; 146 static char etherbuf[18]; 147 char *cp = etherbuf; 148 149 for (i = 0; i < 6; i++) { 150 *cp++ = digits[*ap >> 4]; 151 *cp++ = digits[*ap++ & 0xf]; 152 *cp++ = ':'; 153 } 154 *--cp = 0; 155 return (etherbuf); 156 } 157