usr/src/cmd/cmd-inet/usr.sbin/snoop/snoop_trill.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <stdio.h>
  28 #include <sys/types.h>
  29 #include <sys/socket.h>
  30 #include <sys/ethernet.h>
  31 #include <sys/vlan.h>
  32 #include <net/trill.h>
  33
  34 #include <snoop.h>
  35
  36 int
  37 interpret_trill(int flags, struct ether_header **e, char *data, int *alen)
  38 {
  39         trill_header_t *trillhdr;
  40         struct ether_header *inner_ethhdr;
  41         struct ether_vlan_header *inner_ethvlanhdr;
  42         uint16_t ethertype;
  43         int dlen = *alen;
  44         size_t optslen;
  45         size_t trillhdrlen;
  46
  47         if (dlen < sizeof (trill_header_t)) {
  48                 (void) snprintf(get_sum_line(), MAXLINE,
  49                     "TRILL (short packet)");
  50                 return (0);
  51         }
  52
  53         trillhdr = (trill_header_t *)data;
  54         optslen = GET_TRILL_OPTS_LEN(trillhdr) * sizeof (uint32_t);
  55
  56         if (flags & F_DTAIL) {
  57                 show_header("TRILL: ", "TRILL Data Frame", dlen);
  58                 show_space();
  59
  60                 (void) snprintf(get_line(0, 0), get_line_remain(),
  61                     "Egress nickname = %d",
  62                     ntohs(trillhdr->th_egressnick));
  63                 (void) snprintf(get_line(0, 0), get_line_remain(),
  64                     "Ingress nickname = %d",
  65                     ntohs(trillhdr->th_ingressnick));
  66                 (void) snprintf(get_line(0, 0), get_line_remain(),
  67                     "Hop count = %d", trillhdr->th_hopcount);
  68                 (void) snprintf(get_line(0, 0), get_line_remain(),
  69                     "Multi-destination = %d", trillhdr->th_multidest);
  70                 (void) snprintf(get_line(0, 0), get_line_remain(),
  71                     "Options Len = %d bytes", optslen);
  72                 show_trailer();
  73         }
  74
  75         trillhdrlen = sizeof (trill_header_t) + optslen;
  76
  77         if (dlen < trillhdrlen) {
  78                 (void) snprintf(get_sum_line(), MAXLINE,
  79                     "TRILL (options truncated)");
  80                 return (0);
  81         }
  82
  83         dlen -= trillhdrlen;
  84
  85         if (dlen < sizeof (struct ether_header)) {
  86                 (void) snprintf(get_sum_line(), MAXLINE,
  87                     "TRILL (missing required inner MAC)");
  88                 return (0);
  89         }
  90
  91         inner_ethhdr = (struct ether_header *)(data + trillhdrlen);
  92         if (inner_ethhdr->ether_type != htons(ETHERTYPE_VLAN)) {
  93                 (void) snprintf(get_sum_line(), MAXLINE,
  94                     "TRILL (inner VLAN missing; ethertype %X)",
  95                     ntohs(inner_ethhdr->ether_type));
  96                 return (0);
  97         }
  98
  99         inner_ethvlanhdr = (struct ether_vlan_header *)inner_ethhdr;
 100         ethertype = ntohs(inner_ethvlanhdr->ether_type);
 101
 102         if (flags & F_SUM) {
 103                 (void) snprintf(get_sum_line(), MAXLINE,
 104                     "TRILL D:%d S:%d HC:%d M:%d O:%d L:%d VLAN:%d %s",
 105                     ntohs(trillhdr->th_egressnick),
 106                     ntohs(trillhdr->th_ingressnick),
 107                     trillhdr->th_hopcount,
 108                     trillhdr->th_multidest,
 109                     optslen,
 110                     dlen, VLAN_ID(inner_ethvlanhdr->ether_tci),
 111                     print_ethertype(ethertype));
 112         }
 113
 114         *alen = dlen;
 115         *e = inner_ethhdr;
 116         return (ethertype);
 117 }