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 #include <config.h>
  29
  30 #include "netdissect-stdinc.h"
  31
  32 #include "netdissect.h"
  33 #include "extract.h"
  34 #include "addrtoname.h"
  35
  36
  37 extern const struct tok ethertype_values[];
  38
  39 #define IPOIB_HDRLEN    44
  40
  41 static inline void
  42 ipoib_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
  43 {
  44         uint16_t ether_type;
  45
  46         ether_type = GET_BE_U_2(bp + 40);
  47         if (!ndo->ndo_qflag) {
  48                 ND_PRINT(", ethertype %s (0x%04x)",
  49                              tok2str(ethertype_values,"Unknown", ether_type),
  50                              ether_type);
  51         } else {
  52                 ND_PRINT(", ethertype %s",
  53                              tok2str(ethertype_values,"Unknown", ether_type));
  54         }
  55
  56         ND_PRINT(", length %u: ", length);
  57 }
  58
  59 /*
  60  * Print an InfiniBand frame.
  61  * This might be encapsulated within another frame; we might be passed
  62  * a pointer to a function that can print header information for that
  63  * frame's protocol, and an argument to pass to that function.
  64  */
  65 static void
  66 ipoib_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen,
  67     void (*print_encap_header)(const u_char *), const u_char *encap_header_arg)
  68 {
  69         const u_char *orig_hdr = p;
  70         u_int orig_length;
  71         u_short ether_type;
  72
  73         if (caplen < IPOIB_HDRLEN) {
  74                 nd_print_trunc(ndo);
  75                 ndo->ndo_ll_hdr_len += caplen;
  76                 return;
  77         }
  78
  79         if (length < IPOIB_HDRLEN) {
  80                 nd_print_trunc(ndo);
  81                 ndo->ndo_ll_hdr_len += length;
  82                 return;
  83         }
  84
  85         if (ndo->ndo_eflag) {
  86                 nd_print_protocol_caps(ndo);
  87                 if (print_encap_header != NULL)
  88                         (*print_encap_header)(encap_header_arg);
  89                 ipoib_hdr_print(ndo, p, length);
  90         }
  91         orig_length = length;
  92
  93         ndo->ndo_ll_hdr_len += IPOIB_HDRLEN;
  94         length -= IPOIB_HDRLEN;
  95         caplen -= IPOIB_HDRLEN;
  96         ether_type = GET_BE_U_2(p + 40);
  97         p += IPOIB_HDRLEN;
  98
  99         if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
 100                 /* ether_type not known, print raw packet */
 101                 if (!ndo->ndo_eflag) {
 102                         if (print_encap_header != NULL)
 103                                 (*print_encap_header)(encap_header_arg);
 104                         ipoib_hdr_print(ndo, orig_hdr , orig_length);
 105                 }
 106
 107                 if (!ndo->ndo_suppress_default_print)
 108                         ND_DEFAULTPRINT(p, caplen);
 109         }
 110 }
 111
 112 /*
 113  * This is the top level routine of the printer.  'p' points
 114  * to the ether header of the packet, 'h->ts' is the timestamp,
 115  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 116  * is the number of bytes actually captured.
 117  */
 118 void
 119 ipoib_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 120 {
 121         ndo->ndo_protocol = "ipoib";
 122         ipoib_print(ndo, p, h->len, h->caplen, NULL, NULL);
 123 }