The Tcpdump Group git mirrors - tcpdump/blob - print-ipoib.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   3  *      1997, 2000, 2011, 2012
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that: (1) source code distributions
   8  * retain the above copyright notice and this paragraph in its entirety, (2)
   9  * distributions including binary code include the above copyright notice and
  10  * this paragraph in its entirety in the documentation or other materials
  11  * provided with the distribution, and (3) all advertising materials mentioning
  12  * features or use of this software display the following acknowledgement:
  13  * ``This product includes software developed by the University of California,
  14  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  15  * the University nor the names of its contributors may be used to endorse
  16  * or promote products derived from this software without specific prior
  17  * written permission.
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  21  */
  22 /*
  23  * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 /* \summary: IP-over-InfiniBand (IPoIB) printer */
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include <config.h>
  30 #endif
  31
  32 #include <netdissect-stdinc.h>
  33
  34 #include <stdio.h>
  35 #include <pcap.h>
  36
  37 #include "netdissect.h"
  38 #include "extract.h"
  39 #include "addrtoname.h"
  40
  41
  42 extern const struct tok ethertype_values[];
  43
  44 #define IPOIB_HDRLEN    44
  45
  46 static inline void
  47 ipoib_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
  48 {
  49         uint16_t ether_type;
  50
  51         ether_type = GET_BE_U_2(bp + 40);
  52         if (!ndo->ndo_qflag) {
  53                 ND_PRINT(", ethertype %s (0x%04x)",
  54                              tok2str(ethertype_values,"Unknown", ether_type),
  55                              ether_type);
  56         } else {
  57                 ND_PRINT(", ethertype %s",
  58                              tok2str(ethertype_values,"Unknown", ether_type));
  59         }
  60
  61         ND_PRINT(", length %u: ", length);
  62 }
  63
  64 /*
  65  * Print an InfiniBand frame.
  66  * This might be encapsulated within another frame; we might be passed
  67  * a pointer to a function that can print header information for that
  68  * frame's protocol, and an argument to pass to that function.
  69  */
  70 static void
  71 ipoib_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen,
  72     void (*print_encap_header)(const u_char *), const u_char *encap_header_arg)
  73 {
  74         const u_char *orig_hdr = p;
  75         u_int orig_length;
  76         u_short ether_type;
  77
  78         if (caplen < IPOIB_HDRLEN || length < IPOIB_HDRLEN) {
  79                 nd_print_trunc(ndo);
  80                 return;
  81         }
  82
  83         if (ndo->ndo_eflag) {
  84                 ND_PRINT("IPOIB");
  85                 if (print_encap_header != NULL)
  86                         (*print_encap_header)(encap_header_arg);
  87                 ipoib_hdr_print(ndo, p, length);
  88         }
  89         orig_length = length;
  90
  91         length -= IPOIB_HDRLEN;
  92         caplen -= IPOIB_HDRLEN;
  93         ether_type = GET_BE_U_2(p + 40);
  94         p += IPOIB_HDRLEN;
  95
  96         if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
  97                 /* ether_type not known, print raw packet */
  98                 if (!ndo->ndo_eflag) {
  99                         if (print_encap_header != NULL)
 100                                 (*print_encap_header)(encap_header_arg);
 101                         ipoib_hdr_print(ndo, orig_hdr , orig_length);
 102                 }
 103
 104                 if (!ndo->ndo_suppress_default_print)
 105                         ND_DEFAULTPRINT(p, caplen);
 106         }
 107 }
 108
 109 /*
 110  * This is the top level routine of the printer.  'p' points
 111  * to the ether header of the packet, 'h->ts' is the timestamp,
 112  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 113  * is the number of bytes actually captured.
 114  */
 115 u_int
 116 ipoib_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 117 {
 118         ndo->ndo_protocol = "ipoib";
 119         ipoib_print(ndo, p, h->len, h->caplen, NULL, NULL);
 120
 121         return (IPOIB_HDRLEN);
 122 }