1 /* $NetBSD: ether.c,v 1.11 1997/07/07 15:52:50 drochner 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 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL) 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/socket.h> 43 #include <string.h> 44 45 #include <net/if.h> 46 #include <netinet/in.h> 47 #include <netinet/if_ether.h> 48 #include <netinet/in_systm.h> 49 #include <netinet/ip.h> 50 51 #include "stand.h" 52 #include "net.h" 53 #include "netif.h" 54 55 /* Caller must leave room for ethernet header in front!! */ 56 ssize_t 57 sendether(d, pkt, len, dea, etype) 58 struct iodesc *d; 59 void *pkt; 60 size_t len; 61 u_char *dea; 62 int etype; 63 { 64 ssize_t n; 65 struct ether_header *eh; 66 67 #ifdef ETHER_DEBUG 68 if (debug) 69 printf("sendether: called\n"); 70 #endif 71 72 eh = (struct ether_header *)pkt - 1; 73 len += sizeof(*eh); 74 75 MACPY(d->myea, eh->ether_shost); /* by byte */ 76 MACPY(dea, eh->ether_dhost); /* by byte */ 77 eh->ether_type = htons(etype); 78 79 n = netif_put(d, eh, len); 80 if (n == -1 || n < sizeof(*eh)) 81 return (-1); 82 83 n -= sizeof(*eh); 84 return (n); 85 } 86 87 /* 88 * Get a packet of any Ethernet type, with our address or 89 * the broadcast address. Save the Ether type in arg 5. 90 * NOTE: Caller must leave room for the Ether header. 91 */ 92 ssize_t 93 readether(d, pkt, len, tleft, etype) 94 struct iodesc *d; 95 void *pkt; 96 size_t len; 97 time_t tleft; 98 u_int16_t *etype; 99 { 100 ssize_t n; 101 struct ether_header *eh; 102 103 #ifdef ETHER_DEBUG 104 if (debug) 105 printf("readether: called\n"); 106 #endif 107 108 eh = (struct ether_header *)pkt - 1; 109 len += sizeof(*eh); 110 111 n = netif_get(d, eh, len, tleft); 112 if (n == -1 || n < sizeof(*eh)) 113 return (-1); 114 115 /* Validate Ethernet address. */ 116 if (bcmp(d->myea, eh->ether_dhost, 6) != 0 && 117 bcmp(bcea, eh->ether_dhost, 6) != 0) { 118 #ifdef ETHER_DEBUG 119 if (debug) 120 printf("readether: not ours (ea=%s)\n", 121 ether_sprintf(eh->ether_dhost)); 122 #endif 123 return (-1); 124 } 125 *etype = ntohs(eh->ether_type); 126 127 n -= sizeof(*eh); 128 return (n); 129 } 130 131 /* 132 * Convert Ethernet address to printable (loggable) representation. 133 */ 134 static char digits[] = "0123456789abcdef"; 135 char * 136 ether_sprintf(ap) 137 u_char *ap; 138 { 139 int i; 140 static char etherbuf[18]; 141 char *cp = etherbuf; 142 143 for (i = 0; i < 6; i++) { 144 *cp++ = digits[*ap >> 4]; 145 *cp++ = digits[*ap++ & 0xf]; 146 *cp++ = ':'; 147 } 148 *--cp = 0; 149 return (etherbuf); 150 } 151