1 /* $OpenBSD: ether.c,v 1.10 2014/11/19 20:28:56 miod 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/ip.h> 51 52 #include "stand.h" 53 #include "net.h" 54 #include "netif.h" 55 56 /* Caller must leave room for ethernet header in front!! */ 57 ssize_t 58 sendether(struct iodesc *d, void *pkt, size_t len, u_char *dea, int etype) 59 { 60 ssize_t n; 61 struct ether_header *eh; 62 63 #ifdef ETHER_DEBUG 64 if (debug) 65 printf("sendether: called\n"); 66 #endif 67 68 eh = (struct ether_header *)pkt - 1; 69 len += sizeof(*eh); 70 71 MACPY(d->myea, eh->ether_shost); /* by byte */ 72 MACPY(dea, eh->ether_dhost); /* by byte */ 73 eh->ether_type = htons(etype); 74 75 n = netif_put(d, eh, len); 76 if (n < 0 || (size_t)n < sizeof(*eh)) 77 return (-1); 78 79 n -= sizeof(*eh); 80 return (n); 81 } 82 83 /* 84 * Get a packet of any Ethernet type, with our address or 85 * the broadcast address. Save the Ether type in arg 5. 86 * NOTE: Caller must leave room for the Ether header. 87 */ 88 ssize_t 89 readether(struct iodesc *d, void *pkt, size_t len, time_t tleft, 90 u_int16_t *etype) 91 { 92 ssize_t n; 93 struct ether_header *eh; 94 95 #ifdef ETHER_DEBUG 96 if (debug) 97 printf("readether: called\n"); 98 #endif 99 100 eh = (struct ether_header *)pkt - 1; 101 len += sizeof(*eh); 102 103 n = netif_get(d, eh, len, tleft); 104 if (n < 0 || (size_t)n < sizeof(*eh)) 105 return (-1); 106 107 /* Validate Ethernet address. */ 108 if (bcmp(d->myea, eh->ether_dhost, 6) != 0 && 109 bcmp(bcea, eh->ether_dhost, 6) != 0) { 110 #ifdef ETHER_DEBUG 111 if (debug) 112 printf("readether: not ours (ea=%s)\n", 113 ether_sprintf(eh->ether_dhost)); 114 #endif 115 return (-1); 116 } 117 *etype = ntohs(eh->ether_type); 118 119 n -= sizeof(*eh); 120 return (n); 121 } 122 123 /* 124 * Convert Ethernet address to printable (loggable) representation. 125 */ 126 static const char digits[] = "0123456789abcdef"; 127 const char * 128 ether_sprintf(const u_char *ap) 129 { 130 int i; 131 static char etherbuf[18]; 132 char *cp = etherbuf; 133 134 for (i = 0; i < 6; i++) { 135 *cp++ = digits[*ap >> 4]; 136 *cp++ = digits[*ap++ & 0xf]; 137 *cp++ = ':'; 138 } 139 *--cp = 0; 140 return (etherbuf); 141 } 142