xref: /illumos-gate/usr/src/boot/libsa/ether.c (revision 22028508)
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  * 3. 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 
40 #include <sys/param.h>
41 #include <sys/socket.h>
42 #include <string.h>
43 
44 #include <net/if.h>
45 #include <netinet/in.h>
46 #include <netinet/if_ether.h>
47 #include <netinet/in_systm.h>
48 #include <netinet/ip.h>
49 
50 #include "stand.h"
51 #include "net.h"
52 #include "netif.h"
53 
54 /* Caller must leave room for ethernet header in front!! */
55 ssize_t
sendether(struct iodesc * d,void * pkt,size_t len,uint8_t * dea,int etype)56 sendether(struct iodesc *d, void *pkt, size_t len, uint8_t *dea, int etype)
57 {
58 	ssize_t n;
59 	struct ether_header *eh;
60 
61 #ifdef ETHER_DEBUG
62 	if (debug)
63 		printf("sendether: called\n");
64 #endif
65 
66 	eh = (struct ether_header *)pkt - 1;
67 	len += sizeof (*eh);
68 
69 	MACPY(d->myea, eh->ether_shost);		/* by byte */
70 	MACPY(dea, eh->ether_dhost);			/* by byte */
71 	eh->ether_type = htons(etype);
72 
73 	n = netif_put(d, eh, len);
74 	if (n == -1 || n < sizeof (*eh))
75 		return (-1);
76 
77 	n -= sizeof (*eh);
78 	return (n);
79 }
80 
81 /*
82  * Get a packet of any Ethernet type, with our address or
83  * the broadcast address.  Save the Ether type in etype.
84  * Unless there is an error, we pass the whole packet and the unencapsulated
85  * data.
86  */
87 ssize_t
readether(struct iodesc * d,void ** pkt,void ** payload,time_t tleft,uint16_t * etype)88 readether(struct iodesc *d, void **pkt, void **payload, time_t tleft,
89     uint16_t *etype)
90 {
91 	ssize_t n;
92 	struct ether_header *eh;
93 	void *ptr;
94 
95 #ifdef ETHER_DEBUG
96 	if (debug)
97 		printf("readether: called\n");
98 #endif
99 
100 	ptr = NULL;
101 	n = netif_get(d, &ptr, tleft);
102 	if (n == -1 || n < sizeof (*eh)) {
103 		free(ptr);
104 		return (-1);
105 	}
106 
107 	eh = (struct ether_header *)((uintptr_t)ptr + ETHER_ALIGN);
108 	/* Validate Ethernet address. */
109 	if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
110 	    bcmp(bcea, eh->ether_dhost, 6) != 0) {
111 #ifdef ETHER_DEBUG
112 		if (debug)
113 			printf("readether: not ours (ea=%s)\n",
114 			    ether_sprintf(eh->ether_dhost));
115 #endif
116 		free(ptr);
117 		return (-1);
118 	}
119 
120 	*pkt = ptr;
121 	*payload = (void *)((uintptr_t)eh + sizeof (*eh));
122 	*etype = ntohs(eh->ether_type);
123 
124 	n -= sizeof (*eh);
125 	return (n);
126 }
127 
128 /*
129  * Convert Ethernet address to printable (loggable) representation.
130  */
131 static char digits[] = "0123456789abcdef";
132 char *
ether_sprintf(uchar_t * ap)133 ether_sprintf(uchar_t *ap)
134 {
135 	int i;
136 	static char etherbuf[18];
137 	char *cp = etherbuf;
138 
139 	for (i = 0; i < 6; i++) {
140 		*cp++ = digits[*ap >> 4];
141 		*cp++ = digits[*ap++ & 0xf];
142 		*cp++ = ':';
143 	}
144 	*--cp = 0;
145 	return (etherbuf);
146 }
147