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: }
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