epan/dissectors/packet-ipoib.c

   1 /* packet-ipoib.c
   2  * Routines for decoding IP over InfiniBand (IPoIB) packet disassembly
   3  * See: https://tools.ietf.org/html/rfc4391#section-6
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #include "config.h"
  13
  14 #include <epan/packet.h>
  15 #include <epan/etypes.h>
  16 #include <wiretap/wtap.h>
  17
  18 void proto_register_ipoib(void);
  19 void proto_reg_handoff_ipoib(void);
  20
  21 static dissector_handle_t ipoib_handle;
  22
  23 static int proto_ipoib;
  24 static int hf_dgid;
  25 static int hf_daddr;
  26 static int hf_daddr_qpn;
  27 static int hf_grh;
  28 static int hf_grh_ip_version;
  29 static int hf_grh_traffic_class;
  30 static int hf_grh_flow_label;
  31 static int hf_grh_sqpn;
  32 static int hf_grh_sgid;
  33 static int hf_type;
  34 static int hf_reserved;
  35
  36 static int ett_raw;
  37 static int ett_hdr;
  38
  39 static dissector_handle_t arp_handle;
  40 static dissector_handle_t ip_handle;
  41 static dissector_handle_t ipv6_handle;
  42
  43 static int
  44 dissect_ipoib(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  45 {
  46   proto_tree *fh_tree;
  47   proto_tree *fh_subtree;
  48   proto_item *ti;
  49   tvbuff_t   *next_tvb;
  50   uint16_t    type;
  51   int         grh_size = 0;
  52
  53   if (pinfo->rec->rec_header.packet_header.pkt_encap == WTAP_ENCAP_IP_OVER_IB_PCAP)
  54     grh_size = 40;
  55
  56   /* load the top pane info. This should be overwritten by
  57      the next protocol in the stack */
  58   col_set_str(pinfo->cinfo, COL_PROTOCOL, "IPoIB");
  59   col_set_str(pinfo->cinfo, COL_INFO, "IP over Infiniband");
  60
  61   /* populate a tree in the second pane with the IPoIB header data */
  62   if (tree) {
  63     ti = proto_tree_add_item (tree, proto_ipoib, tvb, 0, grh_size + 4, ENC_NA);
  64     fh_tree = proto_item_add_subtree(ti, ett_raw);
  65
  66     /* for PCAP data populate subtree with GRH pseudo header data */
  67     if (pinfo->rec->rec_header.packet_header.pkt_encap == WTAP_ENCAP_IP_OVER_IB_PCAP) {
  68
  69       /* Zero means GRH is not valid (unicast). Only destination
  70          address is set. */
  71       if (tvb_get_ntohs(tvb, 0) == 0) {
  72         ti = proto_tree_add_item (fh_tree, hf_daddr, tvb, 20, 20, ENC_NA);
  73         fh_subtree = proto_item_add_subtree(ti, ett_hdr);
  74
  75         proto_tree_add_item(fh_subtree, hf_daddr_qpn, tvb, 21, 3, ENC_BIG_ENDIAN);
  76         proto_tree_add_item(fh_subtree, hf_dgid, tvb, 24, 16, ENC_NA);
  77       } else {
  78         ti = proto_tree_add_item (fh_tree, hf_grh, tvb, 0, 40, ENC_NA);
  79         fh_subtree = proto_item_add_subtree(ti, ett_hdr);
  80
  81         proto_tree_add_item(fh_subtree, hf_grh_ip_version, tvb, 0, 1, ENC_BIG_ENDIAN);
  82         proto_tree_add_item(fh_subtree, hf_grh_traffic_class, tvb, 0, 2, ENC_BIG_ENDIAN);
  83         proto_tree_add_item(fh_subtree, hf_grh_flow_label,tvb, 0, 4, ENC_BIG_ENDIAN);
  84         proto_tree_add_item(fh_subtree, hf_grh_sqpn, tvb, 5, 3, ENC_BIG_ENDIAN);
  85         proto_tree_add_item(fh_subtree, hf_grh_sgid, tvb, 8, 16, ENC_NA);
  86         proto_tree_add_item(fh_subtree, hf_dgid, tvb, 24, 16, ENC_NA);
  87       }
  88     }
  89
  90     proto_tree_add_item(fh_tree, hf_type, tvb, grh_size + 0, 2, ENC_BIG_ENDIAN);
  91     proto_tree_add_item(fh_tree, hf_reserved, tvb, grh_size + 2, 2, ENC_BIG_ENDIAN);
  92   }
  93
  94   next_tvb = tvb_new_subset_remaining(tvb, grh_size + 4);
  95
  96   type = tvb_get_ntohs(tvb, grh_size + 0);
  97   switch (type) {
  98   case ETHERTYPE_IP:
  99     call_dissector(ip_handle, next_tvb, pinfo, tree);
 100     break;
 101   case ETHERTYPE_IPv6:
 102     call_dissector(ipv6_handle, next_tvb, pinfo, tree);
 103     break;
 104   case ETHERTYPE_ARP:
 105   case ETHERTYPE_REVARP:
 106     call_dissector(arp_handle, next_tvb, pinfo, tree);
 107     break;
 108   default:
 109     break;
 110   }
 111   return tvb_captured_length(tvb);
 112 }
 113
 114 void
 115 proto_register_ipoib(void)
 116 {
 117   static hf_register_info hf[] = {
 118     { &hf_daddr,
 119       { "Destination address", "ipoib.daddr",
 120         FT_NONE, BASE_NONE, NULL, 0x0,
 121         NULL, HFILL}},
 122     { &hf_daddr_qpn,
 123       { "Destination QPN", "ipoib.daddr.qpn",
 124         FT_UINT24, BASE_HEX, NULL, 0x0,
 125         NULL, HFILL}},
 126     { &hf_dgid,
 127       { "Destination GID", "ipoib.dgid",
 128         FT_IPv6, BASE_NONE, NULL, 0x0,
 129         NULL, HFILL }},
 130     { &hf_grh,
 131       { "Global Route Header", "ipoib.grh",
 132         FT_NONE, BASE_NONE, NULL, 0x0,
 133         NULL, HFILL}},
 134     { &hf_grh_ip_version, {
 135        "IP Version", "ipoib.grh.ipver",
 136        FT_UINT8, BASE_DEC, NULL, 0xF0,
 137        NULL, HFILL}},
 138     { &hf_grh_traffic_class, {
 139        "Traffic Class", "ipoib.grh.tclass",
 140        FT_UINT16, BASE_DEC, NULL, 0x0FF0,
 141        NULL, HFILL}},
 142     { &hf_grh_flow_label, {
 143        "Flow Label", "ipoib.grh.flowlabel",
 144        FT_UINT32, BASE_DEC, NULL, 0x000FFFFF,
 145        NULL, HFILL}},
 146     { &hf_grh_sqpn,
 147       { "Source QPN", "ipoib.grh.sqpn",
 148         FT_UINT24, BASE_HEX, NULL, 0x0,
 149         NULL, HFILL}},
 150     { &hf_grh_sgid,
 151       { "Source GID", "ipoib.grh.sgid",
 152         FT_IPv6, BASE_NONE, NULL, 0x0,
 153         NULL, HFILL }},
 154     { &hf_type,
 155       { "Type", "ipoib.type",
 156         FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
 157         NULL, HFILL }},
 158     { &hf_reserved,
 159       { "Reserved",  "ipoib.reserved",
 160         FT_UINT16, BASE_HEX, NULL, 0x0,
 161         NULL, HFILL }}
 162   };
 163
 164   static int *ett[] = {
 165     &ett_raw,
 166     &ett_hdr
 167   };
 168
 169   proto_ipoib = proto_register_protocol("IP over Infiniband", "IPoIB", "ipoib");
 170   proto_register_field_array(proto_ipoib, hf, array_length(hf));
 171   proto_register_subtree_array(ett, array_length(ett));
 172
 173   ipoib_handle = register_dissector("ipoib", dissect_ipoib, proto_ipoib);
 174 }
 175
 176 void
 177 proto_reg_handoff_ipoib(void)
 178 {
 179   /*
 180    * Get handles for the ARP, IP and IPv6 dissectors.
 181    */
 182   arp_handle  = find_dissector_add_dependency("arp", proto_ipoib);
 183   ip_handle   = find_dissector_add_dependency("ip", proto_ipoib);
 184   ipv6_handle = find_dissector_add_dependency("ipv6", proto_ipoib);
 185
 186   dissector_add_uint("wtap_encap", WTAP_ENCAP_IP_OVER_IB_SNOOP, ipoib_handle);
 187   dissector_add_uint("wtap_encap", WTAP_ENCAP_IP_OVER_IB_PCAP, ipoib_handle);
 188 }
 189
 190 /*
 191  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 192  *
 193  * Local Variables:
 194  * c-basic-offset: 2
 195  * tab-width: 8
 196  * indent-tabs-mode: nil
 197  * End:
 198  *
 199  * ex: set shiftwidth=2 tabstop=8 expandtab:
 200  * :indentSize=2:tabSize=8:noTabs=true:
 201  */