diff options
Diffstat (limited to 'stand/libsa/ether.c')
| -rw-r--r-- | stand/libsa/ether.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/stand/libsa/ether.c b/stand/libsa/ether.c new file mode 100644 index 000000000000..3616777e7955 --- /dev/null +++ b/stand/libsa/ether.c @@ -0,0 +1,147 @@ +/* $NetBSD: ether.c,v 1.11 1997/07/07 15:52:50 drochner Exp $ */ + +/* + * Copyright (c) 1992 Regents of the University of California. + * All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL) + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/socket.h> +#include <string.h> + +#include <net/if.h> +#include <netinet/in.h> +#include <netinet/if_ether.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> + +#include "stand.h" +#include "net.h" +#include "netif.h" + +/* Caller must leave room for ethernet header in front!! */ +ssize_t +sendether(struct iodesc *d, void *pkt, size_t len, uint8_t *dea, int etype) +{ + ssize_t n; + struct ether_header *eh; + +#ifdef ETHER_DEBUG + if (debug) + printf("sendether: called\n"); +#endif + + eh = (struct ether_header *)pkt - 1; + len += sizeof(*eh); + + MACPY(d->myea, eh->ether_shost); /* by byte */ + MACPY(dea, eh->ether_dhost); /* by byte */ + eh->ether_type = htons(etype); + + n = netif_put(d, eh, len); + if (n == -1 || n < sizeof(*eh)) + return (-1); + + n -= sizeof(*eh); + return (n); +} + +/* + * Get a packet of any Ethernet type, with our address or + * the broadcast address. Save the Ether type in etype. + * Unless there is an error, we pass the whole packet and the unencapsulated + * data. + */ +ssize_t +readether(struct iodesc *d, void **pkt, void **payload, time_t tleft, + uint16_t *etype) +{ + ssize_t n; + struct ether_header *eh; + void *ptr; + +#ifdef ETHER_DEBUG + if (debug) + printf("readether: called\n"); +#endif + + ptr = NULL; + n = netif_get(d, &ptr, tleft); + if (n == -1 || n < sizeof(*eh)) { + free(ptr); + return (-1); + } + + eh = (struct ether_header *)((uintptr_t)ptr + ETHER_ALIGN); + /* Validate Ethernet address. */ + if (bcmp(d->myea, eh->ether_dhost, 6) != 0 && + bcmp(bcea, eh->ether_dhost, 6) != 0) { +#ifdef ETHER_DEBUG + if (debug) + printf("readether: not ours (ea=%s)\n", + ether_sprintf(eh->ether_dhost)); +#endif + free(ptr); + return (-1); + } + + *pkt = ptr; + *payload = (void *)((uintptr_t)eh + sizeof(*eh)); + *etype = ntohs(eh->ether_type); + + n -= sizeof(*eh); + return (n); +} + +/* + * Convert Ethernet address to printable (loggable) representation. + */ +static char digits[] = "0123456789abcdef"; +char * +ether_sprintf(u_char *ap) +{ + int i; + static char etherbuf[18]; + char *cp = etherbuf; + + for (i = 0; i < 6; i++) { + *cp++ = digits[*ap >> 4]; + *cp++ = digits[*ap++ & 0xf]; + *cp++ = ':'; + } + *--cp = 0; + return (etherbuf); +} |