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Annotation of sys/lib/libsa/ether.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: ether.c,v 1.7 2003/08/11 06:23:09 deraadt 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/in_systm.h>
                     51: #include <netinet/ip.h>
                     52:
                     53: #include "stand.h"
                     54: #include "net.h"
                     55: #include "netif.h"
                     56:
                     57: /* Caller must leave room for ethernet header in front!! */
                     58: ssize_t
                     59: sendether(d, pkt, len, dea, etype)
                     60:        struct iodesc *d;
                     61:        void *pkt;
                     62:        size_t len;
                     63:        u_char *dea;
                     64:        int etype;
                     65: {
                     66: ssize_t n;
                     67: struct ether_header *eh;
                     68:
                     69: #ifdef ETHER_DEBUG
                     70:        if (debug)
                     71:                printf("sendether: called\n");
                     72: #endif
                     73:
                     74:        eh = (struct ether_header *)pkt - 1;
                     75:        len += sizeof(*eh);
                     76:
                     77:        MACPY(d->myea, eh->ether_shost);                /* by byte */
                     78:        MACPY(dea, eh->ether_dhost);                    /* by byte */
                     79:        eh->ether_type = htons(etype);
                     80:
                     81:        n = netif_put(d, eh, len);
                     82:        if (n < 0 || (size_t)n < sizeof(*eh))
                     83:                return (-1);
                     84:
                     85:        n -= sizeof(*eh);
                     86:        return (n);
                     87: }
                     88:
                     89: /*
                     90:  * Get a packet of any Ethernet type, with our address or
                     91:  * the broadcast address.  Save the Ether type in arg 5.
                     92:  * NOTE: Caller must leave room for the Ether header.
                     93:  */
                     94: ssize_t
                     95: readether(d, pkt, len, tleft, etype)
                     96: struct iodesc *d;
                     97: void *pkt;
                     98: size_t len;
                     99:        time_t tleft;
                    100: u_int16_t *etype;
                    101: {
                    102: ssize_t n;
                    103: struct ether_header *eh;
                    104:
                    105: #ifdef ETHER_DEBUG
                    106:        if (debug)
                    107:                printf("readether: called\n");
                    108: #endif
                    109:
                    110:        eh = (struct ether_header *)pkt - 1;
                    111:        len += sizeof(*eh);
                    112:
                    113:        n = netif_get(d, eh, len, tleft);
                    114:        if (n < 0 || (size_t)n < sizeof(*eh))
                    115:                return (-1);
                    116:
                    117:        /* Validate Ethernet address. */
                    118:        if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
                    119:            bcmp(bcea, eh->ether_dhost, 6) != 0) {
                    120: #ifdef ETHER_DEBUG
                    121:                if (debug)
                    122:                        printf("readether: not ours (ea=%s)\n",
                    123:                            ether_sprintf(eh->ether_dhost));
                    124: #endif
                    125:                return (-1);
                    126:        }
                    127:        *etype = ntohs(eh->ether_type);
                    128:
                    129:        n -= sizeof(*eh);
                    130:        return (n);
                    131: }
                    132:
                    133: /*
                    134:  * Convert Ethernet address to printable (loggable) representation.
                    135:  */
                    136: static char digits[] = "0123456789abcdef";
                    137: char *
                    138: ether_sprintf(u_char *ap)
                    139: {
                    140:        int i;
                    141:        static char etherbuf[18];
                    142:        char *cp = etherbuf;
                    143:
                    144:        for (i = 0; i < 6; i++) {
                    145:                *cp++ = digits[*ap >> 4];
                    146:                *cp++ = digits[*ap++ & 0xf];
                    147:                *cp++ = ':';
                    148:        }
                    149:        *--cp = 0;
                    150:        return (etherbuf);
                    151: }