Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 658 insertions, 0 deletions

diff --git a/epan/dissectors/packet-sll.c b/epan/dissectors/packet-sll.c
new file mode 100644
index 00000000..e2920a23
--- /dev/null
+++ b/epan/dissectors/packet-sll.c
@@ -0,0 +1,658 @@
+/* packet-sll.c
+ * Routines for disassembly of packets from Linux "cooked mode" captures
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/capture_dissectors.h>
+#include <epan/conversation_table.h>
+#include <epan/arptypes.h>
+#include <wsutil/pint.h>
+#include "packet-sll.h"
+#include "packet-ipx.h"
+#include "packet-llc.h"
+#include "packet-eth.h"
+#include "packet-ppp.h"
+#include "packet-gre.h"
+#include "packet-arp.h"
+#include <epan/addr_resolv.h>
+#include <epan/etypes.h>
+#include <epan/arptypes.h>
+#include <epan/decode_as.h>
+#include <epan/proto_data.h>
+
+void proto_register_sll(void);
+void proto_reg_handoff_sll(void);
+
+typedef struct sll_tap_data {
+	address src_address;
+} sll_tap_data;
+
+/*
+ * A LINKTYPE_LINUX_SLL fake link-layer header.
+ */
+#define SLL_HEADER_SIZE		16	/* total header length */
+
+/*
+ * A LINKTYPE_LINUX_SLL fake link-layer header.
+ */
+#define SLL2_HEADER_SIZE	20	/* total header length */
+
+#define SLL_ADDRLEN		8	/* length of address field */
+
+/*
+ * The LINUX_SLL_ values for "sll_pkttype".
+ */
+#define LINUX_SLL_HOST		0
+#define LINUX_SLL_BROADCAST	1
+#define LINUX_SLL_MULTICAST	2
+#define LINUX_SLL_OTHERHOST	3
+#define LINUX_SLL_OUTGOING	4
+
+static const value_string packet_type_vals[] = {
+	{ LINUX_SLL_HOST,	"Unicast to us" },
+	{ LINUX_SLL_BROADCAST,	"Broadcast" },
+	{ LINUX_SLL_MULTICAST,	"Multicast" },
+	{ LINUX_SLL_OTHERHOST,	"Unicast to another host" },
+	{ LINUX_SLL_OUTGOING,	"Sent by us" },
+	{ 0,			NULL }
+};
+
+static const value_string ltype_vals[] = {
+	{ LINUX_SLL_P_802_3,	"Raw 802.3" },
+	{ LINUX_SLL_P_ETHERNET,	"Ethernet" },
+	{ LINUX_SLL_P_802_2,	"802.2 LLC" },
+	{ LINUX_SLL_P_PPPHDLC,	"PPP (HDLC)" },
+	{ LINUX_SLL_P_CAN,	"CAN" },
+	{ LINUX_SLL_P_CANFD,	"CAN FD" },
+	{ LINUX_SLL_P_IRDA_LAP,	"IrDA LAP" },
+	{ LINUX_SLL_P_ISI,	"ISI" },
+	{ LINUX_SLL_P_IEEE802154,	"IEEE 802.15.4" },
+	{ LINUX_SLL_P_MCTP,	"MCTP" },
+	{ 0,			NULL }
+};
+
+
+static dissector_handle_t sll_handle;
+static dissector_handle_t sll2_handle;
+static dissector_handle_t ethertype_handle;
+static dissector_handle_t netlink_handle;
+
+static int proto_sll;
+static int sll_tap = -1;
+
+static int hf_sll_etype = -1;
+static int hf_sll_gretype = -1;
+static int hf_sll_halen = -1;
+static int hf_sll_hatype = -1;
+static int hf_sll_ifindex = -1;
+static int hf_sll_ltype = -1;
+static int hf_sll_pkttype = -1;
+static int hf_sll_src_eth = -1;
+static int hf_sll_src_ipv4 = -1;
+static int hf_sll_src_other = -1;
+static int hf_sll_trailer = -1;
+static int hf_sll_unused = -1;
+
+static gint ett_sll = -1;
+
+static dissector_table_t sll_hatype_dissector_table;
+static dissector_table_t sll_ltype_dissector_table;
+static dissector_table_t gre_dissector_table;
+
+static void sll_prompt(packet_info *pinfo, gchar* result)
+{
+	snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "SLL protocol type 0x%04x as",
+		GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_sll, 0)));
+}
+
+static gpointer sll_value(packet_info *pinfo)
+{
+	return p_get_proto_data(pinfo->pool, pinfo, proto_sll, 0);
+}
+
+static const char* sll_conv_get_filter_type(conv_item_t* conv, conv_filter_type_e filter)
+{
+	if ((filter == CONV_FT_SRC_ADDRESS) && (conv->src_address.type == AT_ETHER))
+		return "sll.src.eth";
+
+	if ((filter == CONV_FT_ANY_ADDRESS) && (conv->src_address.type == AT_ETHER))
+		return "sll.src.eth";
+
+	if ((filter == CONV_FT_SRC_ADDRESS) && (conv->src_address.type == AT_IPv4))
+		return "sll.src.ipv4";
+
+	if ((filter == CONV_FT_ANY_ADDRESS) && (conv->src_address.type == AT_IPv4))
+		return "sll.src.ipv4";
+
+	return CONV_FILTER_INVALID;
+}
+
+static ct_dissector_info_t sll_ct_dissector_info = {&sll_conv_get_filter_type};
+static address no_dst = {AT_NONE, 0, NULL, NULL};
+
+static tap_packet_status
+sll_conversation_packet(void *pct, packet_info *pinfo, epan_dissect_t *edt _U_, const void *vip, tap_flags_t flags)
+{
+	conv_hash_t *hash = (conv_hash_t*) pct;
+    hash->flags = flags;
+
+	const sll_tap_data *tap_data = (const sll_tap_data*)vip;
+
+	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);
+
+	return TAP_PACKET_REDRAW;
+}
+
+static const char* sll_endpoint_get_filter_type(endpoint_item_t* endpoint, conv_filter_type_e filter)
+{
+	if ((filter == CONV_FT_SRC_ADDRESS) && (endpoint->myaddress.type == AT_ETHER))
+		return "sll.src.eth";
+
+	if ((filter == CONV_FT_ANY_ADDRESS) && (endpoint->myaddress.type == AT_ETHER))
+		return "sll.src.eth";
+
+	if ((filter == CONV_FT_SRC_ADDRESS) && (endpoint->myaddress.type == AT_IPv4))
+		return "sll.src.ipv4";
+
+	if ((filter == CONV_FT_ANY_ADDRESS) && (endpoint->myaddress.type == AT_IPv4))
+		return "sll.src.ipv4";
+
+	return CONV_FILTER_INVALID;
+}
+
+static et_dissector_info_t sll_endpoint_dissector_info = {&sll_endpoint_get_filter_type};
+
+static tap_packet_status
+sll_endpoint_packet(void *pit, packet_info *pinfo, epan_dissect_t *edt _U_, const void *vip, tap_flags_t flags)
+{
+	conv_hash_t *hash = (conv_hash_t*) pit;
+    hash->flags = flags;
+
+	const sll_tap_data *tap_data = (const sll_tap_data*)vip;
+
+	add_endpoint_table_data(hash, &tap_data->src_address, 0, TRUE, 1, pinfo->fd->pkt_len, &sll_endpoint_dissector_info, ENDPOINT_NONE);
+
+	return TAP_PACKET_REDRAW;
+}
+
+static gboolean
+capture_sll(const guchar *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
+{
+	guint16 hatype;
+	guint16 protocol;
+
+	if (!BYTES_ARE_IN_FRAME(0, len, SLL_HEADER_SIZE))
+		return FALSE;
+
+	protocol = pntoh16(&pd[14]);
+	if (protocol <= 1536) {	/* yes, 1536 - that's how Linux does it */
+		/*
+		 * "proto" is *not* a length field, it's a Linux internal
+		 * protocol type.
+		 */
+		hatype = pntoh16(&pd[2]);
+		if (try_capture_dissector("sll.hatype", hatype, pd,
+		    SLL_HEADER_SIZE, len, cpinfo, pseudo_header))
+			return TRUE;
+		return try_capture_dissector("sll.ltype", protocol, pd, SLL_HEADER_SIZE, len, cpinfo, pseudo_header);
+	} else {
+		return try_capture_dissector("ethertype", protocol, pd, SLL_HEADER_SIZE, len, cpinfo, pseudo_header);
+	}
+	return FALSE;
+}
+
+static gboolean
+capture_sll2(const guchar *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
+{
+	guint16 hatype;
+	guint16 protocol;
+
+	if (!BYTES_ARE_IN_FRAME(0, len, SLL2_HEADER_SIZE))
+		return FALSE;
+
+	protocol = pntoh16(&pd[0]);
+	if (protocol <= 1536) {	/* yes, 1536 - that's how Linux does it */
+		/*
+		 * "proto" is *not* a length field, it's a Linux internal
+		 * protocol type.
+		 */
+		hatype = pntoh16(&pd[8]);
+		if (try_capture_dissector("sll.hatype", hatype, pd,
+		    SLL2_HEADER_SIZE, len, cpinfo, pseudo_header))
+			return TRUE;
+		return try_capture_dissector("sll.ltype", protocol, pd, SLL2_HEADER_SIZE, len, cpinfo, pseudo_header);
+	} else {
+		return try_capture_dissector("ethertype", protocol, pd, SLL2_HEADER_SIZE, len, cpinfo, pseudo_header);
+	}
+	return FALSE;
+}
+
+static void
+add_ll_address(proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb,
+    int halen_offset, int halen_len, sll_tap_data *tap_data)
+{
+	guint32 ha_len;
+	int ha_offset = halen_offset + halen_len;
+
+	/*
+	 * XXX - check the link-layer address type value?
+	 * For now, we just assume ha_len 4 is IPv4 and ha_len 6
+	 * is Ethernet.
+	 */
+	proto_tree_add_item_ret_uint(tree, hf_sll_halen, tvb, halen_offset, halen_len, ENC_BIG_ENDIAN, &ha_len);
+
+	switch (ha_len) {
+	case 4:
+		set_address_tvb(&pinfo->dl_src, AT_IPv4, 4, tvb, ha_offset);
+		copy_address_shallow(&pinfo->src, &pinfo->dl_src);
+		copy_address_wmem(wmem_file_scope(), &tap_data->src_address, &pinfo->src);
+		proto_tree_add_item(tree, hf_sll_src_ipv4, tvb, ha_offset, 4, ENC_BIG_ENDIAN);
+		break;
+	case 6:
+		set_address_tvb(&pinfo->dl_src, AT_ETHER, 6, tvb, ha_offset);
+		copy_address_shallow(&pinfo->src, &pinfo->dl_src);
+		copy_address_wmem(wmem_file_scope(), &tap_data->src_address, &pinfo->src);
+		proto_tree_add_item(tree, hf_sll_src_eth, tvb, ha_offset, 6, ENC_NA);
+		break;
+	case 0:
+		break;
+	default:
+		proto_tree_add_item(tree, hf_sll_src_other, tvb,
+			    ha_offset, ha_len > 8 ? 8 : ha_len, ENC_NA);
+		break;
+	}
+
+	/* Not all bytes of SLL_ADDRLEN have been used. Add remaining as unused */
+	if (ha_len < SLL_ADDRLEN)
+		proto_tree_add_item(tree, hf_sll_unused, tvb, ha_offset + ha_len,
+				SLL_ADDRLEN - ha_len, ENC_NA);
+}
+
+static guint16
+add_protocol_type(proto_tree *fh_tree, tvbuff_t *tvb, int protocol_offset,
+    int hatype)
+{
+	guint16 protocol;
+
+	protocol = tvb_get_ntohs(tvb, protocol_offset);
+	if (protocol <= 1536) {	/* yes, 1536 - that's how Linux does it */
+		/*
+		 * "proto" is *not* a length field, it's a Linux internal
+		 * protocol type.
+		 * We therefore cannot say how much of the packet will
+		 * be trailer data.
+		 * XXX - do the same thing we do for packets with Ethertypes?
+		 */
+		proto_tree_add_uint(fh_tree, hf_sll_ltype, tvb,
+		    protocol_offset, 2, protocol);
+	} else {
+		switch (hatype) {
+
+		case ARPHRD_IPGRE:
+			/*
+			 * XXX - the link-layer header appears to consist
+			 * of an IPv4 header followed by a bunch of stuff
+			 * that includes the GRE flags and version, but
+			 * cooked captures strip the link-layer header,
+			 * so we can't provide the flags and version to
+			 * the dissector.
+			 */
+			proto_tree_add_uint(fh_tree, hf_sll_gretype, tvb,
+			    protocol_offset, 2, protocol);
+			break;
+
+		default:
+			proto_tree_add_uint(fh_tree, hf_sll_etype, tvb,
+			    protocol_offset, 2, protocol);
+			break;
+		}
+	}
+	return protocol;
+}
+
+static void
+dissect_payload(proto_tree *tree, packet_info *pinfo, proto_tree *fh_tree,
+    tvbuff_t *tvb, int header_size, int hatype, guint16 protocol)
+{
+	tvbuff_t *next_tvb;
+	ethertype_data_t ethertype_data;
+
+	next_tvb = tvb_new_subset_remaining(tvb, header_size);
+	if (protocol <= 1536) {	/* yes, 1536 - that's how Linux does it */
+		/*
+		 * "proto" is *not* a length field, it's a Linux internal
+		 * protocol type.
+		 * We therefore cannot say how much of the packet will
+		 * be trailer data.
+		 * XXX - do the same thing we do for packets with Ethertypes?
+		 */
+		if (!dissector_try_uint(sll_hatype_dissector_table, hatype,
+		    next_tvb, pinfo, tree)) {
+			p_add_proto_data(pinfo->pool, pinfo, proto_sll, 0, GUINT_TO_POINTER((guint)protocol));
+			if (!dissector_try_uint(sll_ltype_dissector_table,
+			    protocol, next_tvb, pinfo, tree)) {
+				call_data_dissector(next_tvb, pinfo, tree);
+			}
+		}
+	} else {
+		switch (hatype) {
+
+		case ARPHRD_IPGRE:
+			/*
+			 * XXX - the link-layer header appears to consist
+			 * of an IPv4 header followed by a bunch of stuff
+			 * that includes the GRE flags and version, but
+			 * cooked captures strip the link-layer header,
+			 * so we can't provide the flags and version to
+			 * the dissector.
+			 */
+			dissector_try_uint(gre_dissector_table, protocol,
+			    next_tvb, pinfo, tree);
+			break;
+
+		default:
+			ethertype_data.etype = protocol;
+			ethertype_data.payload_offset = header_size;
+			ethertype_data.fh_tree = fh_tree;
+			ethertype_data.trailer_id = hf_sll_trailer;
+			ethertype_data.fcs_len = 0;
+
+			call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, &ethertype_data);
+			break;
+		}
+	}
+}
+
+static int
+dissect_sll_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int encap)
+{
+	guint16 pkttype;
+	guint16 protocol;
+	guint16 hatype;
+	int header_size;
+	int version;
+	proto_item *ti;
+	proto_tree *fh_tree;
+	sll_tap_data* tap_data;
+
+	switch (encap) {
+
+	case WTAP_ENCAP_SLL:
+		pkttype = tvb_get_ntohs(tvb, 0);
+		header_size = SLL_HEADER_SIZE;
+		version = 1;
+		break;
+
+	case WTAP_ENCAP_SLL2:
+		pkttype = tvb_get_ntohs(tvb, 10);
+		header_size = SLL2_HEADER_SIZE;
+		version = 2;
+		break;
+
+	default:
+		DISSECTOR_ASSERT_NOT_REACHED();
+	}
+
+	/*
+	 * Set "pinfo->p2p_dir" if the packet wasn't received
+	 * promiscuously.
+	 */
+	switch (pkttype) {
+
+	case LINUX_SLL_HOST:
+	case LINUX_SLL_BROADCAST:
+	case LINUX_SLL_MULTICAST:
+		pinfo->p2p_dir = P2P_DIR_RECV;
+		break;
+
+	case LINUX_SLL_OUTGOING:
+		pinfo->p2p_dir = P2P_DIR_SENT;
+		break;
+	}
+
+	switch (encap) {
+
+	case WTAP_ENCAP_SLL:
+		hatype = tvb_get_ntohs(tvb, 2);
+		break;
+
+	case WTAP_ENCAP_SLL2:
+		hatype = tvb_get_ntohs(tvb, 8);
+		break;
+
+	default:
+		DISSECTOR_ASSERT_NOT_REACHED();
+	}
+
+	/*
+	 * XXX - special purpose hack.  Netlink packets have a hardware
+	 * address type of ARPHRD_NETLINK, but the protocol type value
+	 * indicates the Netlink message type; we just hand the netlink
+	 * dissector our *entire* packet.
+	 *
+	 * That's different from link-layer types such as 802.11+radiotap,
+	 * where the payload follows the complete SLL header, and the
+	 * protocol field in the SLL header is irrelevant; for those,
+	 * we have the sll.hatype dissector table.
+	 */
+	if (hatype == ARPHRD_NETLINK) {
+		return call_dissector(netlink_handle, tvb, pinfo, tree);
+	}
+
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "SLL");
+	col_clear(pinfo->cinfo, COL_INFO);
+
+	col_add_str(pinfo->cinfo, COL_INFO,
+		    val_to_str(pkttype, packet_type_vals, "Unknown (%u)"));
+
+	ti = proto_tree_add_protocol_format(tree, proto_sll, tvb, 0,
+			header_size, "Linux cooked capture v%d", version);
+	fh_tree = proto_item_add_subtree(ti, ett_sll);
+	tap_data = wmem_new0(wmem_file_scope(), sll_tap_data);
+
+	switch (encap) {
+
+	case WTAP_ENCAP_SLL:
+		proto_tree_add_item(fh_tree, hf_sll_pkttype, tvb, 0, 2, ENC_BIG_ENDIAN);
+
+		proto_tree_add_uint(fh_tree, hf_sll_hatype, tvb, 2, 2, hatype);
+
+		add_ll_address(fh_tree, pinfo, tvb, 4, 2, tap_data);
+
+		protocol = add_protocol_type(fh_tree, tvb, 14, hatype);
+
+		dissect_payload(tree, pinfo, fh_tree, tvb, SLL_HEADER_SIZE, hatype, protocol);
+		break;
+
+	case WTAP_ENCAP_SLL2:
+		protocol = add_protocol_type(fh_tree, tvb, 0, hatype);
+
+		proto_tree_add_item(fh_tree, hf_sll_ifindex, tvb, 4, 4, ENC_BIG_ENDIAN);
+
+		proto_tree_add_uint(fh_tree, hf_sll_hatype, tvb, 8, 2, hatype);
+
+		proto_tree_add_item(fh_tree, hf_sll_pkttype, tvb, 10, 1, ENC_BIG_ENDIAN);
+
+		add_ll_address(fh_tree, pinfo, tvb, 11, 1, tap_data);
+
+		dissect_payload(tree, pinfo, fh_tree, tvb, SLL2_HEADER_SIZE, hatype, protocol);
+		break;
+
+	default:
+		DISSECTOR_ASSERT_NOT_REACHED();
+	}
+
+	tap_queue_packet(sll_tap, pinfo, tap_data);
+
+	return tvb_captured_length(tvb);
+}
+
+static int
+dissect_sll_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+	return dissect_sll_common(tvb, pinfo, tree, WTAP_ENCAP_SLL);
+}
+
+static int
+dissect_sll_v2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+	return dissect_sll_common(tvb, pinfo, tree, WTAP_ENCAP_SLL2);
+}
+
+void
+proto_register_sll(void)
+{
+	static hf_register_info hf[] = {
+		{ &hf_sll_pkttype,
+			{ "Packet type", "sll.pkttype",
+			  FT_UINT16, BASE_DEC, VALS(packet_type_vals), 0x0,
+			  NULL, HFILL }
+		},
+		{ &hf_sll_hatype,
+			{ "Link-layer address type", "sll.hatype",
+			  FT_UINT16, BASE_DEC, VALS(arp_hrd_vals), 0x0,
+			  NULL, HFILL }
+		},
+		{ &hf_sll_halen,
+			{ "Link-layer address length", "sll.halen",
+			  FT_UINT16, BASE_DEC, NULL, 0x0,
+			  NULL, HFILL }
+		},
+		{ &hf_sll_src_eth,
+			{ "Source", "sll.src.eth",
+			  FT_ETHER, BASE_NONE, NULL, 0x0,
+			  "Source link-layer address", HFILL }
+		},
+		{ &hf_sll_src_ipv4,
+			{ "Source", "sll.src.ipv4",
+			  FT_IPv4, BASE_NONE, NULL, 0x0,
+			  "Source link-layer address", HFILL }
+		},
+		{ &hf_sll_src_other,
+			{ "Source", "sll.src.other",
+			  FT_BYTES, BASE_NONE, NULL, 0x0,
+			  "Source link-layer address", HFILL }
+		},
+		{ &hf_sll_unused,
+			{ "Unused", "sll.unused",
+			  FT_BYTES, BASE_NONE, NULL, 0x0,
+			  "Unused bytes", HFILL }
+		},
+		{ &hf_sll_ltype,
+			{ "Protocol", "sll.ltype",
+			  FT_UINT16, BASE_HEX, VALS(ltype_vals), 0x0,
+			  "Linux protocol type", HFILL }
+		},
+		{ &hf_sll_gretype,
+			{ "Protocol", "sll.gretype",
+			  FT_UINT16, BASE_HEX, VALS(gre_typevals), 0x0,
+			  "GRE protocol type", HFILL }
+		},
+		{ &hf_sll_etype,
+			{ "Protocol", "sll.etype",
+			  FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
+			  "Ethernet protocol type", HFILL }
+		},
+		{ &hf_sll_trailer,
+			{ "Trailer", "sll.trailer",
+			  FT_BYTES, BASE_NONE, NULL, 0x0,
+			  NULL, HFILL }
+		},
+		{ &hf_sll_ifindex,
+			{ "Interface index", "sll.ifindex",
+			  FT_UINT32, BASE_DEC, NULL, 0x0,
+			  NULL, HFILL }
+		},
+	};
+
+	static gint *ett[] = {
+		&ett_sll
+	};
+
+	/* Decode As handling */
+	static build_valid_func sll_da_build_value[1] = {sll_value};
+	static decode_as_value_t sll_da_values = {sll_prompt, 1, sll_da_build_value};
+	static decode_as_t sll_da = {"sll.ltype", "sll.ltype", 1, 0, &sll_da_values, NULL, NULL,
+				decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL};
+
+	proto_sll = proto_register_protocol("Linux cooked-mode capture", "SLL", "sll" );
+	proto_register_field_array(proto_sll, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	sll_handle = register_dissector("sll_v1", dissect_sll_v1, proto_sll);
+	sll2_handle = register_dissector("sll_v2", dissect_sll_v2, proto_sll);
+	sll_tap = register_tap("sll");
+
+	/*
+	 * Sigh.
+	 *
+	 * For some packets, the link-layer header *isn't* been stripped
+	 * off in a cooked capture; the hardware address type is the
+	 * device ARPTYPE, so, for those packets, we should call the
+	 * dissector for that value.
+	 *
+	 * We define a "sll.hatype" dissector table; we try dissecting
+	 * with that first, and then try the protocol type if nothing
+	 * is found in sll.hatype.
+	 */
+	sll_hatype_dissector_table = register_dissector_table (
+		"sll.hatype",
+		"Linux SLL ARPHRD_ type",
+		proto_sll, FT_UINT16,
+		BASE_DEC
+	);
+	register_capture_dissector_table("sll.hatype", "Linux SLL ARPHRD_ type");
+
+	sll_ltype_dissector_table = register_dissector_table (
+		"sll.ltype",
+		"Linux SLL protocol type",
+		proto_sll, FT_UINT16,
+		BASE_HEX
+	);
+	register_capture_dissector_table("sll.ltype", "Linux SLL protocol");
+
+	register_conversation_table(proto_sll, TRUE, sll_conversation_packet, sll_endpoint_packet);
+
+	register_decode_as(&sll_da);
+}
+
+void
+proto_reg_handoff_sll(void)
+{
+	capture_dissector_handle_t sll_cap_handle;
+	capture_dissector_handle_t sll2_cap_handle;
+
+	/*
+	 * Get handles for the IPX and LLC dissectors.
+	 */
+	gre_dissector_table = find_dissector_table("gre.proto");
+	ethertype_handle = find_dissector_add_dependency("ethertype", proto_sll);
+	netlink_handle = find_dissector_add_dependency("netlink", proto_sll);
+
+	dissector_add_uint("wtap_encap", WTAP_ENCAP_SLL, sll_handle);
+	dissector_add_uint("wtap_encap", WTAP_ENCAP_SLL2, sll2_handle);
+	sll_cap_handle = create_capture_dissector_handle(capture_sll, proto_sll);
+	capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_SLL, sll_cap_handle);
+	sll2_cap_handle = create_capture_dissector_handle(capture_sll2, proto_sll);
+	capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_SLL2, sll2_cap_handle);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */