1 /* $NetBSD: ether.c,v 1.20 2005/12/11 12:24:46 christos 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 56 #include "stand.h" 57 #include "net.h" 58 59 /* Caller must leave room for ethernet header in front!! */ 60 ssize_t 61 sendether(d, pkt, len, dea, etype) 62 struct iodesc *d; 63 void *pkt; 64 size_t len; 65 u_char *dea; 66 int etype; 67 { 68 ssize_t n; 69 struct ether_header *eh; 70 71 #ifdef ETHER_DEBUG 72 if (debug) 73 printf("sendether: called\n"); 74 #endif 75 76 eh = (struct ether_header *)pkt - 1; 77 len += sizeof(*eh); 78 79 MACPY(d->myea, eh->ether_shost); /* by byte */ 80 MACPY(dea, eh->ether_dhost); /* by byte */ 81 eh->ether_type = htons(etype); 82 83 n = netif_put(d, eh, len); 84 if (n == -1 || (size_t)n < sizeof(*eh)) 85 return (-1); 86 87 n -= sizeof(*eh); 88 return (n); 89 } 90 91 /* 92 * Get a packet of any Ethernet type, with our address or 93 * the broadcast address. Save the Ether type in arg 5. 94 * NOTE: Caller must leave room for the Ether header. 95 */ 96 ssize_t 97 readether(d, pkt, len, tleft, etype) 98 struct iodesc *d; 99 void *pkt; 100 size_t len; 101 time_t tleft; 102 u_int16_t *etype; 103 { 104 ssize_t n; 105 struct ether_header *eh; 106 107 #ifdef ETHER_DEBUG 108 if (debug) 109 printf("readether: called\n"); 110 #endif 111 112 eh = (struct ether_header *)pkt - 1; 113 len += sizeof(*eh); 114 115 n = netif_get(d, eh, len, tleft); 116 if (n == -1 || (size_t)n < sizeof(*eh)) 117 return (-1); 118 119 /* Validate Ethernet address. */ 120 if (memcmp(d->myea, eh->ether_dhost, 6) != 0 && 121 memcmp(bcea, eh->ether_dhost, 6) != 0) { 122 #ifdef ETHER_DEBUG 123 if (debug) 124 printf("readether: not ours (ea=%s)\n", 125 ether_sprintf(eh->ether_dhost)); 126 #endif 127 return (-1); 128 } 129 *etype = ntohs(eh->ether_type); 130 131 n -= sizeof(*eh); 132 return (n); 133 } 134