/*
* Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-ipfc.c,v 1.8 2024/09/02 16:15:31 christos Exp $");
#endif

/* \summary: IP over Fibre Channel printer */

/* specification: RFC 2625 */

#include <config.h>

#include "netdissect-stdinc.h"

#include <string.h>

#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "addrtoname.h"


struct ipfc_header {
       nd_byte ipfc_dhost[2+MAC_ADDR_LEN];
       nd_byte ipfc_shost[2+MAC_ADDR_LEN];
};

#define IPFC_HDRLEN 16

/* Extract src, dst addresses */
static void
extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc,
                  char *ipfcdst)
{
       /*
        * We assume that, as per RFC 2625, the lower 48 bits of the
        * source and destination addresses are MAC addresses.
        */
       memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], MAC_ADDR_LEN);
       memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], MAC_ADDR_LEN);
}

/*
* Print the Network_Header
*/
static void
ipfc_hdr_print(netdissect_options *ndo,
              const struct ipfc_header *ipfcp _U_, u_int length,
              const u_char *ipfcsrc, const u_char *ipfcdst)
{
       const char *srcname, *dstname;

       srcname = etheraddr_string(ndo, ipfcsrc);
       dstname = etheraddr_string(ndo, ipfcdst);

       /*
        * XXX - should we show the upper 16 bits of the addresses?
        * Do so only if "vflag" is set?
        * Section 3.3 "FC Port and Node Network Addresses" says that
        *
        *    In this specification, both the Source and Destination
        *    4-bit NAA identifiers SHALL be set to binary '0001'
        *    indicating that an IEEE 48-bit MAC address is contained
        *    in the lower 48 bits of the network address fields. The
        *    high order 12 bits in the network address fields SHALL
        *    be set to 0x0000.
        *
        * so, for captures following this specification, the upper 16
        * bits should be 0x1000, followed by a MAC address.
        */
       ND_PRINT("%s > %s, length %u: ", srcname, dstname, length);
}

static u_int
ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
{
       const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
       nd_mac_addr srcmac, dstmac;
       struct lladdr_info src, dst;
       int llc_hdrlen;

       ndo->ndo_protocol = "ipfc";
       ND_TCHECK_LEN(p, IPFC_HDRLEN);
       /*
        * Get the network addresses into a canonical form
        */
       extract_ipfc_addrs(ipfcp, (char *)srcmac, (char *)dstmac);

       if (ndo->ndo_eflag)
               ipfc_hdr_print(ndo, ipfcp, length, srcmac, dstmac);

       src.addr = srcmac;
       src.addr_string = etheraddr_string;
       dst.addr = dstmac;
       dst.addr_string = etheraddr_string;

       /* Skip over Network_Header */
       length -= IPFC_HDRLEN;
       p += IPFC_HDRLEN;
       caplen -= IPFC_HDRLEN;

       /* Try to print the LLC-layer header & higher layers */
       llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
       if (llc_hdrlen < 0) {
               /*
                * Some kinds of LLC packet we cannot
                * handle intelligently
                */
               if (!ndo->ndo_suppress_default_print)
                       ND_DEFAULTPRINT(p, caplen);
               llc_hdrlen = -llc_hdrlen;
       }
       return (IPFC_HDRLEN + llc_hdrlen);
}

/*
* This is the top level routine of the printer.  'p' points
* to the Network_Header of the packet, 'h->ts' is the timestamp,
* 'h->len' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured.
*/
void
ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
       ndo->ndo_protocol = "ipfc";
       ndo->ndo_ll_hdr_len += ipfc_print(ndo, p, h->len, h->caplen);
}