epan/dissectors/packet-sll.c

   1 /* packet-sll.c
   2  * Routines for disassembly of packets from Linux "cooked mode" captures
   3  *
   4  * Wireshark - Network traffic analyzer
   5  * By Gerald Combs <gerald@wireshark.org>
   6  * Copyright 1998 Gerald Combs
   7  *
   8  * SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10 #include "config.h"
  11
  12 #include <epan/packet.h>
  13 #include <epan/capture_dissectors.h>
  14 #include <epan/conversation_table.h>
  15 #include <epan/arptypes.h>
  16 #include <wsutil/pint.h>
  17 #include "packet-sll.h"
  18 #include "packet-ipx.h"
  19 #include "packet-llc.h"
  20 #include "packet-eth.h"
  21 #include "packet-ppp.h"
  22 #include "packet-gre.h"
  23 #include "packet-arp.h"
  24 #include <epan/addr_resolv.h>
  25 #include <epan/etypes.h>
  26 #include <epan/arptypes.h>
  27 #include <epan/decode_as.h>
  28 #include <epan/proto_data.h>
  29
  30 void proto_register_sll(void);
  31 void proto_reg_handoff_sll(void);
  32
  33 typedef struct sll_tap_data {
  34         address src_address;
  35 } sll_tap_data;
  36
  37 /*
  38  * A LINKTYPE_LINUX_SLL fake link-layer header.
  39  */
  40 #define SLL_HEADER_SIZE         16      /* total header length */
  41
  42 /*
  43  * A LINKTYPE_LINUX_SLL fake link-layer header.
  44  */
  45 #define SLL2_HEADER_SIZE        20      /* total header length */
  46
  47 #define SLL_ADDRLEN             8       /* length of address field */
  48
  49 /*
  50  * The LINUX_SLL_ values for "sll_pkttype".
  51  */
  52 #define LINUX_SLL_HOST          0
  53 #define LINUX_SLL_BROADCAST     1
  54 #define LINUX_SLL_MULTICAST     2
  55 #define LINUX_SLL_OTHERHOST     3
  56 #define LINUX_SLL_OUTGOING      4
  57
  58 static const value_string packet_type_vals[] = {
  59         { LINUX_SLL_HOST,       "Unicast to us" },
  60         { LINUX_SLL_BROADCAST,  "Broadcast" },
  61         { LINUX_SLL_MULTICAST,  "Multicast" },
  62         { LINUX_SLL_OTHERHOST,  "Unicast to another host" },
  63         { LINUX_SLL_OUTGOING,   "Sent by us" },
  64         { 0,                    NULL }
  65 };
  66
  67 static const value_string ltype_vals[] = {
  68         { LINUX_SLL_P_802_3,    "Raw 802.3" },
  69         { LINUX_SLL_P_ETHERNET, "Ethernet" },
  70         { LINUX_SLL_P_802_2,    "802.2 LLC" },
  71         { LINUX_SLL_P_PPPHDLC,  "PPP (HDLC)" },
  72         { LINUX_SLL_P_CAN,      "CAN" },
  73         { LINUX_SLL_P_CANFD,    "CAN FD" },
  74         { LINUX_SLL_P_IRDA_LAP, "IrDA LAP" },
  75         { LINUX_SLL_P_ISI,      "ISI" },
  76         { LINUX_SLL_P_IEEE802154,       "IEEE 802.15.4" },
  77         { LINUX_SLL_P_MCTP,     "MCTP" },
  78         { 0,                    NULL }
  79 };
  80
  81
  82 static dissector_handle_t sll_handle;
  83 static dissector_handle_t sll2_handle;
  84 static dissector_handle_t ethertype_handle;
  85 static dissector_handle_t netlink_handle;
  86
  87 static int proto_sll;
  88 static int sll_tap;
  89
  90 static int hf_sll_etype;
  91 static int hf_sll_gretype;
  92 static int hf_sll_halen;
  93 static int hf_sll_hatype;
  94 static int hf_sll_ifindex;
  95 static int hf_sll_ltype;
  96 static int hf_sll_pkttype;
  97 static int hf_sll_src_eth;
  98 static int hf_sll_src_ipv4;
  99 static int hf_sll_src_other;
 100 static int hf_sll_trailer;
 101 static int hf_sll_unused;
 102
 103 static int ett_sll;
 104
 105 static dissector_table_t sll_hatype_dissector_table;
 106 static dissector_table_t sll_ltype_dissector_table;
 107 static dissector_table_t gre_dissector_table;
 108
 109 static void sll_prompt(packet_info *pinfo, char* result)
 110 {
 111         snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "SLL protocol type 0x%04x as",
 112                 GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_sll, 0)));
 113 }
 114
 115 static void *sll_value(packet_info *pinfo)
 116 {
 117         return p_get_proto_data(pinfo->pool, pinfo, proto_sll, 0);
 118 }
 119
 120 static const char* sll_conv_get_filter_type(conv_item_t* conv, conv_filter_type_e filter)
 121 {
 122         if ((filter == CONV_FT_SRC_ADDRESS) && (conv->src_address.type == AT_ETHER))
 123                 return "sll.src.eth";
 124
 125         if ((filter == CONV_FT_ANY_ADDRESS) && (conv->src_address.type == AT_ETHER))
 126                 return "sll.src.eth";
 127
 128         if ((filter == CONV_FT_SRC_ADDRESS) && (conv->src_address.type == AT_IPv4))
 129                 return "sll.src.ipv4";
 130
 131         if ((filter == CONV_FT_ANY_ADDRESS) && (conv->src_address.type == AT_IPv4))
 132                 return "sll.src.ipv4";
 133
 134         return CONV_FILTER_INVALID;
 135 }
 136
 137 static ct_dissector_info_t sll_ct_dissector_info = {&sll_conv_get_filter_type};
 138 static address no_dst = ADDRESS_INIT_NONE;
 139
 140 static tap_packet_status
 141 sll_conversation_packet(void *pct, packet_info *pinfo, epan_dissect_t *edt _U_, const void *vip, tap_flags_t flags)
 142 {
 143         conv_hash_t *hash = (conv_hash_t*) pct;
 144     hash->flags = flags;
 145
 146         const sll_tap_data *tap_data = (const sll_tap_data*)vip;
 147
 148         add_conversation_table_data(hash, &tap_data->src_address, &no_dst, 0, 0, 1, pinfo->fd->pkt_len, &pinfo->rel_ts, &pinfo->abs_ts, &sll_ct_dissector_info, CONVERSATION_NONE);
 149
 150         return TAP_PACKET_REDRAW;
 151 }
 152
 153 static const char* sll_endpoint_get_filter_type(endpoint_item_t* endpoint, conv_filter_type_e filter)
 154 {
 155         if ((filter == CONV_FT_SRC_ADDRESS) && (endpoint->myaddress.type == AT_ETHER))
 156                 return "sll.src.eth";
 157
 158         if ((filter == CONV_FT_ANY_ADDRESS) && (endpoint->myaddress.type == AT_ETHER))
 159                 return "sll.src.eth";
 160
 161         if ((filter == CONV_FT_SRC_ADDRESS) && (endpoint->myaddress.type == AT_IPv4))
 162                 return "sll.src.ipv4";
 163
 164         if ((filter == CONV_FT_ANY_ADDRESS) && (endpoint->myaddress.type == AT_IPv4))
 165                 return "sll.src.ipv4";
 166
 167         return CONV_FILTER_INVALID;
 168 }
 169
 170 static et_dissector_info_t sll_endpoint_dissector_info = {&sll_endpoint_get_filter_type};
 171
 172 static tap_packet_status
 173 sll_endpoint_packet(void *pit, packet_info *pinfo, epan_dissect_t *edt _U_, const void *vip, tap_flags_t flags)
 174 {
 175         conv_hash_t *hash = (conv_hash_t*) pit;
 176     hash->flags = flags;
 177
 178         const sll_tap_data *tap_data = (const sll_tap_data*)vip;
 179
 180         add_endpoint_table_data(hash, &tap_data->src_address, 0, true, 1, pinfo->fd->pkt_len, &sll_endpoint_dissector_info, ENDPOINT_NONE);
 181
 182         return TAP_PACKET_REDRAW;
 183 }
 184
 185 static bool
 186 capture_sll(const unsigned char *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
 187 {
 188         uint16_t hatype;
 189         uint16_t protocol;
 190
 191         if (!BYTES_ARE_IN_FRAME(0, len, SLL_HEADER_SIZE))
 192                 return false;
 193
 194         protocol = pntoh16(&pd[14]);
 195         if (protocol <= 1536) { /* yes, 1536 - that's how Linux does it */
 196                 /*
 197                  * "proto" is *not* a length field, it's a Linux internal
 198                  * protocol type.
 199                  */
 200                 hatype = pntoh16(&pd[2]);
 201                 if (try_capture_dissector("sll.hatype", hatype, pd,
 202                     SLL_HEADER_SIZE, len, cpinfo, pseudo_header))
 203                         return true;
 204                 return try_capture_dissector("sll.ltype", protocol, pd, SLL_HEADER_SIZE, len, cpinfo, pseudo_header);
 205         } else {
 206                 return try_capture_dissector("ethertype", protocol, pd, SLL_HEADER_SIZE, len, cpinfo, pseudo_header);
 207         }
 208         return false;
 209 }
 210
 211 static bool
 212 capture_sll2(const unsigned char *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
 213 {
 214         uint16_t hatype;
 215         uint16_t protocol;
 216
 217         if (!BYTES_ARE_IN_FRAME(0, len, SLL2_HEADER_SIZE))
 218                 return false;
 219
 220         protocol = pntoh16(&pd[0]);
 221         if (protocol <= 1536) { /* yes, 1536 - that's how Linux does it */
 222                 /*
 223                  * "proto" is *not* a length field, it's a Linux internal
 224                  * protocol type.
 225                  */
 226                 hatype = pntoh16(&pd[8]);
 227                 if (try_capture_dissector("sll.hatype", hatype, pd,
 228                     SLL2_HEADER_SIZE, len, cpinfo, pseudo_header))
 229                         return true;
 230                 return try_capture_dissector("sll.ltype", protocol, pd, SLL2_HEADER_SIZE, len, cpinfo, pseudo_header);
 231         } else {
 232                 return try_capture_dissector("ethertype", protocol, pd, SLL2_HEADER_SIZE, len, cpinfo, pseudo_header);
 233         }
 234         return false;
 235 }
 236
 237 static void
 238 add_ll_address(proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb,
 239     int halen_offset, int halen_len, sll_tap_data *tap_data)
 240 {
 241         uint32_t ha_len;
 242         int ha_offset = halen_offset + halen_len;
 243
 244         /*
 245          * XXX - check the link-layer address type value?
 246          * For now, we just assume ha_len 4 is IPv4 and ha_len 6
 247          * is Ethernet.
 248          */
 249         proto_tree_add_item_ret_uint(tree, hf_sll_halen, tvb, halen_offset, halen_len, ENC_BIG_ENDIAN, &ha_len);
 250
 251         switch (ha_len) {
 252         case 4:
 253                 set_address_tvb(&pinfo->dl_src, AT_IPv4, 4, tvb, ha_offset);
 254                 copy_address_shallow(&pinfo->src, &pinfo->dl_src);
 255                 copy_address_wmem(wmem_file_scope(), &tap_data->src_address, &pinfo->src);
 256                 proto_tree_add_item(tree, hf_sll_src_ipv4, tvb, ha_offset, 4, ENC_BIG_ENDIAN);
 257                 break;
 258         case 6:
 259                 set_address_tvb(&pinfo->dl_src, AT_ETHER, 6, tvb, ha_offset);
 260                 copy_address_shallow(&pinfo->src, &pinfo->dl_src);
 261                 copy_address_wmem(wmem_file_scope(), &tap_data->src_address, &pinfo->src);
 262                 proto_tree_add_item(tree, hf_sll_src_eth, tvb, ha_offset, 6, ENC_NA);
 263                 break;
 264         case 0:
 265                 break;
 266         default:
 267                 proto_tree_add_item(tree, hf_sll_src_other, tvb,
 268                             ha_offset, ha_len > 8 ? 8 : ha_len, ENC_NA);
 269                 break;
 270         }
 271
 272         /* Not all bytes of SLL_ADDRLEN have been used. Add remaining as unused */
 273         if (ha_len < SLL_ADDRLEN)
 274                 proto_tree_add_item(tree, hf_sll_unused, tvb, ha_offset + ha_len,
 275                                 SLL_ADDRLEN - ha_len, ENC_NA);
 276 }
 277
 278 static uint16_t
 279 add_protocol_type(proto_tree *fh_tree, tvbuff_t *tvb, int protocol_offset,
 280     int hatype)
 281 {
 282         uint16_t protocol;
 283
 284         protocol = tvb_get_ntohs(tvb, protocol_offset);
 285         if (protocol <= 1536) { /* yes, 1536 - that's how Linux does it */
 286                 /*
 287                  * "proto" is *not* a length field, it's a Linux internal
 288                  * protocol type.
 289                  * We therefore cannot say how much of the packet will
 290                  * be trailer data.
 291                  * XXX - do the same thing we do for packets with Ethertypes?
 292                  */
 293                 proto_tree_add_uint(fh_tree, hf_sll_ltype, tvb,
 294                     protocol_offset, 2, protocol);
 295         } else {
 296                 switch (hatype) {
 297
 298                 case ARPHRD_IPGRE:
 299                         /*
 300                          * XXX - the link-layer header appears to consist
 301                          * of an IPv4 header followed by a bunch of stuff
 302                          * that includes the GRE flags and version, but
 303                          * cooked captures strip the link-layer header,
 304                          * so we can't provide the flags and version to
 305                          * the dissector.
 306                          */
 307                         proto_tree_add_uint(fh_tree, hf_sll_gretype, tvb,
 308                             protocol_offset, 2, protocol);
 309                         break;
 310
 311                 default:
 312                         proto_tree_add_uint(fh_tree, hf_sll_etype, tvb,
 313                             protocol_offset, 2, protocol);
 314                         break;
 315                 }
 316         }
 317         return protocol;
 318 }
 319
 320 static void
 321 dissect_payload(proto_tree *tree, packet_info *pinfo, proto_tree *fh_tree,
 322     tvbuff_t *tvb, int header_size, int hatype, uint16_t protocol)
 323 {
 324         tvbuff_t *next_tvb;
 325         ethertype_data_t ethertype_data;
 326
 327         next_tvb = tvb_new_subset_remaining(tvb, header_size);
 328         if (protocol <= 1536) { /* yes, 1536 - that's how Linux does it */
 329                 /*
 330                  * "proto" is *not* a length field, it's a Linux internal
 331                  * protocol type.
 332                  * We therefore cannot say how much of the packet will
 333                  * be trailer data.
 334                  * XXX - do the same thing we do for packets with Ethertypes?
 335                  */
 336                 if (!dissector_try_uint(sll_hatype_dissector_table, hatype,
 337                     next_tvb, pinfo, tree)) {
 338                         p_add_proto_data(pinfo->pool, pinfo, proto_sll, 0, GUINT_TO_POINTER((unsigned)protocol));
 339                         if (!dissector_try_uint(sll_ltype_dissector_table,
 340                             protocol, next_tvb, pinfo, tree)) {
 341                                 call_data_dissector(next_tvb, pinfo, tree);
 342                         }
 343                 }
 344         } else {
 345                 switch (hatype) {
 346
 347                 case ARPHRD_IPGRE:
 348                         /*
 349                          * XXX - the link-layer header appears to consist
 350                          * of an IPv4 header followed by a bunch of stuff
 351                          * that includes the GRE flags and version, but
 352                          * cooked captures strip the link-layer header,
 353                          * so we can't provide the flags and version to
 354                          * the dissector.
 355                          */
 356                         dissector_try_uint(gre_dissector_table, protocol,
 357                             next_tvb, pinfo, tree);
 358                         break;
 359
 360                 default:
 361                         ethertype_data.etype = protocol;
 362                         ethertype_data.payload_offset = header_size;
 363                         ethertype_data.fh_tree = fh_tree;
 364                         ethertype_data.trailer_id = hf_sll_trailer;
 365                         ethertype_data.fcs_len = 0;
 366
 367                         call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, &ethertype_data);
 368                         break;
 369                 }
 370         }
 371 }
 372
 373 static int
 374 dissect_sll_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int encap)
 375 {
 376         uint16_t pkttype;
 377         uint16_t protocol;
 378         uint16_t hatype;
 379         int header_size;
 380         int version;
 381         proto_item *ti;
 382         proto_tree *fh_tree;
 383         sll_tap_data* tap_data;
 384
 385         switch (encap) {
 386
 387         case WTAP_ENCAP_SLL:
 388                 pkttype = tvb_get_ntohs(tvb, 0);
 389                 header_size = SLL_HEADER_SIZE;
 390                 version = 1;
 391                 break;
 392
 393         case WTAP_ENCAP_SLL2:
 394                 pkttype = tvb_get_ntohs(tvb, 10);
 395                 header_size = SLL2_HEADER_SIZE;
 396                 version = 2;
 397                 break;
 398
 399         default:
 400                 DISSECTOR_ASSERT_NOT_REACHED();
 401         }
 402
 403         /*
 404          * Set "pinfo->p2p_dir" if the packet wasn't received
 405          * promiscuously.
 406          */
 407         switch (pkttype) {
 408
 409         case LINUX_SLL_HOST:
 410         case LINUX_SLL_BROADCAST:
 411         case LINUX_SLL_MULTICAST:
 412                 pinfo->p2p_dir = P2P_DIR_RECV;
 413                 break;
 414
 415         case LINUX_SLL_OUTGOING:
 416                 pinfo->p2p_dir = P2P_DIR_SENT;
 417                 break;
 418         }
 419
 420         switch (encap) {
 421
 422         case WTAP_ENCAP_SLL:
 423                 hatype = tvb_get_ntohs(tvb, 2);
 424                 break;
 425
 426         case WTAP_ENCAP_SLL2:
 427                 hatype = tvb_get_ntohs(tvb, 8);
 428                 break;
 429
 430         default:
 431                 DISSECTOR_ASSERT_NOT_REACHED();
 432         }
 433
 434         /*
 435          * XXX - special purpose hack.  Netlink packets have a hardware
 436          * address type of ARPHRD_NETLINK, but the protocol type value
 437          * indicates the Netlink message type; we just hand the netlink
 438          * dissector our *entire* packet.
 439          *
 440          * That's different from link-layer types such as 802.11+radiotap,
 441          * where the payload follows the complete SLL header, and the
 442          * protocol field in the SLL header is irrelevant; for those,
 443          * we have the sll.hatype dissector table.
 444          */
 445         if (hatype == ARPHRD_NETLINK) {
 446                 return call_dissector(netlink_handle, tvb, pinfo, tree);
 447         }
 448
 449         col_set_str(pinfo->cinfo, COL_PROTOCOL, "SLL");
 450         col_clear(pinfo->cinfo, COL_INFO);
 451
 452         col_add_str(pinfo->cinfo, COL_INFO,
 453                     val_to_str(pkttype, packet_type_vals, "Unknown (%u)"));
 454
 455         ti = proto_tree_add_protocol_format(tree, proto_sll, tvb, 0,
 456                         header_size, "Linux cooked capture v%d", version);
 457         fh_tree = proto_item_add_subtree(ti, ett_sll);
 458         tap_data = wmem_new0(wmem_file_scope(), sll_tap_data);
 459
 460         switch (encap) {
 461
 462         case WTAP_ENCAP_SLL:
 463                 proto_tree_add_item(fh_tree, hf_sll_pkttype, tvb, 0, 2, ENC_BIG_ENDIAN);
 464
 465                 proto_tree_add_uint(fh_tree, hf_sll_hatype, tvb, 2, 2, hatype);
 466
 467                 add_ll_address(fh_tree, pinfo, tvb, 4, 2, tap_data);
 468
 469                 protocol = add_protocol_type(fh_tree, tvb, 14, hatype);
 470
 471                 dissect_payload(tree, pinfo, fh_tree, tvb, SLL_HEADER_SIZE, hatype, protocol);
 472                 break;
 473
 474         case WTAP_ENCAP_SLL2:
 475                 protocol = add_protocol_type(fh_tree, tvb, 0, hatype);
 476
 477                 proto_tree_add_item(fh_tree, hf_sll_ifindex, tvb, 4, 4, ENC_BIG_ENDIAN);
 478
 479                 proto_tree_add_uint(fh_tree, hf_sll_hatype, tvb, 8, 2, hatype);
 480
 481                 proto_tree_add_item(fh_tree, hf_sll_pkttype, tvb, 10, 1, ENC_BIG_ENDIAN);
 482
 483                 add_ll_address(fh_tree, pinfo, tvb, 11, 1, tap_data);
 484
 485                 dissect_payload(tree, pinfo, fh_tree, tvb, SLL2_HEADER_SIZE, hatype, protocol);
 486                 break;
 487
 488         default:
 489                 DISSECTOR_ASSERT_NOT_REACHED();
 490         }
 491
 492         tap_queue_packet(sll_tap, pinfo, tap_data);
 493
 494         return tvb_captured_length(tvb);
 495 }
 496
 497 static int
 498 dissect_sll_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
 499 {
 500         return dissect_sll_common(tvb, pinfo, tree, WTAP_ENCAP_SLL);
 501 }
 502
 503 static int
 504 dissect_sll_v2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
 505 {
 506         return dissect_sll_common(tvb, pinfo, tree, WTAP_ENCAP_SLL2);
 507 }
 508
 509 void
 510 proto_register_sll(void)
 511 {
 512         static hf_register_info hf[] = {
 513                 { &hf_sll_pkttype,
 514                         { "Packet type", "sll.pkttype",
 515                           FT_UINT16, BASE_DEC, VALS(packet_type_vals), 0x0,
 516                           NULL, HFILL }
 517                 },
 518                 { &hf_sll_hatype,
 519                         { "Link-layer address type", "sll.hatype",
 520                           FT_UINT16, BASE_DEC, VALS(arp_hrd_vals), 0x0,
 521                           NULL, HFILL }
 522                 },
 523                 { &hf_sll_halen,
 524                         { "Link-layer address length", "sll.halen",
 525                           FT_UINT16, BASE_DEC, NULL, 0x0,
 526                           NULL, HFILL }
 527                 },
 528                 { &hf_sll_src_eth,
 529                         { "Source", "sll.src.eth",
 530                           FT_ETHER, BASE_NONE, NULL, 0x0,
 531                           "Source link-layer address", HFILL }
 532                 },
 533                 { &hf_sll_src_ipv4,
 534                         { "Source", "sll.src.ipv4",
 535                           FT_IPv4, BASE_NONE, NULL, 0x0,
 536                           "Source link-layer address", HFILL }
 537                 },
 538                 { &hf_sll_src_other,
 539                         { "Source", "sll.src.other",
 540                           FT_BYTES, BASE_NONE, NULL, 0x0,
 541                           "Source link-layer address", HFILL }
 542                 },
 543                 { &hf_sll_unused,
 544                         { "Unused", "sll.unused",
 545                           FT_BYTES, BASE_NONE, NULL, 0x0,
 546                           "Unused bytes", HFILL }
 547                 },
 548                 { &hf_sll_ltype,
 549                         { "Protocol", "sll.ltype",
 550                           FT_UINT16, BASE_HEX, VALS(ltype_vals), 0x0,
 551                           "Linux protocol type", HFILL }
 552                 },
 553                 { &hf_sll_gretype,
 554                         { "Protocol", "sll.gretype",
 555                           FT_UINT16, BASE_HEX, VALS(gre_typevals), 0x0,
 556                           "GRE protocol type", HFILL }
 557                 },
 558                 { &hf_sll_etype,
 559                         { "Protocol", "sll.etype",
 560                           FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
 561                           "Ethernet protocol type", HFILL }
 562                 },
 563                 { &hf_sll_trailer,
 564                         { "Trailer", "sll.trailer",
 565                           FT_BYTES, BASE_NONE, NULL, 0x0,
 566                           NULL, HFILL }
 567                 },
 568                 { &hf_sll_ifindex,
 569                         { "Interface index", "sll.ifindex",
 570                           FT_UINT32, BASE_DEC, NULL, 0x0,
 571                           NULL, HFILL }
 572                 },
 573         };
 574
 575         static int *ett[] = {
 576                 &ett_sll
 577         };
 578
 579         /* Decode As handling */
 580         static build_valid_func sll_da_build_value[1] = {sll_value};
 581         static decode_as_value_t sll_da_values = {sll_prompt, 1, sll_da_build_value};
 582         static decode_as_t sll_da = {"sll.ltype", "sll.ltype", 1, 0, &sll_da_values, NULL, NULL,
 583                                 decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL};
 584
 585         proto_sll = proto_register_protocol("Linux cooked-mode capture", "SLL", "sll" );
 586         proto_register_field_array(proto_sll, hf, array_length(hf));
 587         proto_register_subtree_array(ett, array_length(ett));
 588
 589         sll_handle = register_dissector("sll_v1", dissect_sll_v1, proto_sll);
 590         sll2_handle = register_dissector("sll_v2", dissect_sll_v2, proto_sll);
 591         sll_tap = register_tap("sll");
 592
 593         /*
 594          * Sigh.
 595          *
 596          * For some packets, the link-layer header *isn't* been stripped
 597          * off in a cooked capture; the hardware address type is the
 598          * device ARPTYPE, so, for those packets, we should call the
 599          * dissector for that value.
 600          *
 601          * We define a "sll.hatype" dissector table; we try dissecting
 602          * with that first, and then try the protocol type if nothing
 603          * is found in sll.hatype.
 604          */
 605         sll_hatype_dissector_table = register_dissector_table (
 606                 "sll.hatype",
 607                 "Linux SLL ARPHRD_ type",
 608                 proto_sll, FT_UINT16,
 609                 BASE_DEC
 610         );
 611         register_capture_dissector_table("sll.hatype", "Linux SLL ARPHRD_ type");
 612
 613         sll_ltype_dissector_table = register_dissector_table (
 614                 "sll.ltype",
 615                 "Linux SLL protocol type",
 616                 proto_sll, FT_UINT16,
 617                 BASE_HEX
 618         );
 619         register_capture_dissector_table("sll.ltype", "Linux SLL protocol");
 620
 621         register_conversation_table(proto_sll, true, sll_conversation_packet, sll_endpoint_packet);
 622
 623         register_decode_as(&sll_da);
 624 }
 625
 626 void
 627 proto_reg_handoff_sll(void)
 628 {
 629         capture_dissector_handle_t sll_cap_handle;
 630         capture_dissector_handle_t sll2_cap_handle;
 631
 632         /*
 633          * Get handles for the IPX and LLC dissectors.
 634          */
 635         gre_dissector_table = find_dissector_table("gre.proto");
 636         ethertype_handle = find_dissector_add_dependency("ethertype", proto_sll);
 637         netlink_handle = find_dissector_add_dependency("netlink", proto_sll);
 638
 639         dissector_add_uint("wtap_encap", WTAP_ENCAP_SLL, sll_handle);
 640         dissector_add_uint("wtap_encap", WTAP_ENCAP_SLL2, sll2_handle);
 641         sll_cap_handle = create_capture_dissector_handle(capture_sll, proto_sll);
 642         capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_SLL, sll_cap_handle);
 643         sll2_cap_handle = create_capture_dissector_handle(capture_sll2, proto_sll);
 644         capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_SLL2, sll2_cap_handle);
 645 }
 646
 647 /*
 648  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 649  *
 650  * Local variables:
 651  * c-basic-offset: 8
 652  * tab-width: 8
 653  * indent-tabs-mode: t
 654  * End:
 655  *
 656  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 657  * :indentSize=8:tabSize=8:noTabs=false:
 658  */