1 /* $NetBSD: ether.c,v 1.22 2009/01/12 11:32:45 tsutsui 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(struct iodesc *d, void *pkt, size_t len, u_char *dea, int etype) 62 { 63 ssize_t n; 64 struct ether_header *eh; 65 66 #ifdef ETHER_DEBUG 67 if (debug) 68 printf("sendether: called\n"); 69 #endif 70 71 eh = (struct ether_header *)pkt - 1; 72 len += sizeof(*eh); 73 74 MACPY(d->myea, eh->ether_shost); /* by byte */ 75 MACPY(dea, eh->ether_dhost); /* by byte */ 76 eh->ether_type = htons(etype); 77 78 n = netif_put(d, eh, len); 79 if (n == -1 || (size_t)n < sizeof(*eh)) 80 return -1; 81 82 n -= sizeof(*eh); 83 return n; 84 } 85 86 /* 87 * Get a packet of any Ethernet type, with our address or 88 * the broadcast address. Save the Ether type in arg 5. 89 * NOTE: Caller must leave room for the Ether header. 90 */ 91 ssize_t 92 readether(struct iodesc *d, void *pkt, size_t len, saseconds_t tleft, 93 u_int16_t *etype) 94 { 95 ssize_t n; 96 struct ether_header *eh; 97 98 #ifdef ETHER_DEBUG 99 if (debug) 100 printf("readether: called\n"); 101 #endif 102 103 eh = (struct ether_header *)pkt - 1; 104 len += sizeof(*eh); 105 106 n = netif_get(d, eh, len, tleft); 107 if (n == -1 || (size_t)n < sizeof(*eh)) 108 return -1; 109 110 /* Validate Ethernet address. */ 111 if (memcmp(d->myea, eh->ether_dhost, 6) != 0 && 112 memcmp(bcea, eh->ether_dhost, 6) != 0) { 113 #ifdef ETHER_DEBUG 114 if (debug) 115 printf("readether: not ours (ea=%s)\n", 116 ether_sprintf(eh->ether_dhost)); 117 #endif 118 return -1; 119 } 120 *etype = ntohs(eh->ether_type); 121 122 n -= sizeof(*eh); 123 return n; 124 } 125