+++ /dev/null
-/* packet-vpp.c
- *
- * Routines for the disassembly of fd.io vpp project
- * dispatch captures
- *
- * Copyright (c) 2018 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * This version is not to be upstreamed as-is, since it hooks up the
- * vpp dissector to WTAP_ENCAP_USER13, a test encap type.
- */
-
-#include "config.h"
-
-#include <epan/packet.h>
-#include <epan/expert.h>
-#include <epan/to_str.h>
-#include <epan/in_cksum.h>
-#include <epan/nlpid.h>
-#include <epan/etypes.h>
-#include <stdio.h>
-#include <wsutil/ws_printf.h>
-
-void proto_register_vpp(void);
-void proto_reg_handoff_vpp(void);
-
-static int proto_vpp = -1;
-static int proto_vpp_metadata = -1;
-static int proto_vpp_opaque = -1;
-static int proto_vpp_opaque2 = -1;
-static int proto_vpp_trace = -1;
-static int hf_vpp_nodename = -1;
-static int hf_vpp_metadata = -1;
-static int hf_vpp_buffer_index = -1;
-static int hf_vpp_buffer_opaque = -1;
-static int hf_vpp_buffer_opaque2 = -1;
-static int hf_vpp_buffer_trace = -1;
-
-static gint ett_vpp = -1;
-static gint ett_vpp_opaque = -1;
-static gint ett_vpp_opaque2 = -1;
-static gint ett_vpp_metadata = -1;
-static gint ett_vpp_trace = -1;
-
-static dissector_handle_t vpp_dissector_handle;
-static dissector_handle_t vpp_opaque_dissector_handle;
-static dissector_handle_t vpp_opaque2_dissector_handle;
-static dissector_handle_t vpp_metadata_dissector_handle;
-static dissector_handle_t vpp_trace_dissector_handle;
-
-typedef enum
- {
- VLIB_NODE_PROTO_HINT_NONE = 0,
- VLIB_NODE_PROTO_HINT_ETHERNET,
- VLIB_NODE_PROTO_HINT_IP4,
- VLIB_NODE_PROTO_HINT_IP6,
- VLIB_NODE_PROTO_HINT_TCP,
- VLIB_NODE_PROTO_HINT_UDP,
- VLIB_NODE_N_PROTO_HINTS,
- } vlib_node_proto_hint_t;
-
-static dissector_handle_t next_dissectors[VLIB_NODE_N_PROTO_HINTS];
-
-/* List of next dissectors hints that we know about */
-#define foreach_next_dissector \
-_(VLIB_NODE_PROTO_HINT_ETHERNET, eth_maybefcs) \
-_(VLIB_NODE_PROTO_HINT_IP4, ip) \
-_(VLIB_NODE_PROTO_HINT_IP6, ipv6) \
-_(VLIB_NODE_PROTO_HINT_TCP, tcp) \
-_(VLIB_NODE_PROTO_HINT_UDP, udp)
-
-static void
-add_multi_line_string_to_tree(proto_tree *tree, tvbuff_t *tvb, gint start,
- gint len, int hf)
-{
- gint next;
- int line_len;
- int data_len;
-
- while (len > 0) {
- line_len = tvb_find_line_end(tvb, start, len, &next, FALSE);
- data_len = next - start;
- proto_tree_add_string(tree, hf, tvb, start, data_len,
- tvb_format_stringzpad(tvb, start, line_len));
- start += data_len;
- len -= data_len;
- }
-}
-
-static int
-dissect_vpp_metadata (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
- void* data _U_)
-{
- int offset = 0;
- proto_item *ti;
- proto_tree *metadata_tree;
- gint metadata_string_length;
-
- col_set_str(pinfo->cinfo, COL_PROTOCOL, "VPP-Metadata");
- col_clear(pinfo->cinfo, COL_INFO);
-
- ti = proto_tree_add_item(tree, proto_vpp_metadata, tvb, offset, -1, ENC_NA);
- metadata_tree = proto_item_add_subtree(ti, ett_vpp_metadata);
-
- /* How long is the metadata string? */
- metadata_string_length = tvb_strsize (tvb, offset);
-
- add_multi_line_string_to_tree (metadata_tree, tvb, 0,
- metadata_string_length,
- hf_vpp_metadata);
- return tvb_captured_length(tvb);
-}
-
-static int
-dissect_vpp_trace (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
- void* data _U_)
-{
- int offset = 0;
- proto_item *ti;
- proto_tree *trace_tree;
- gint trace_string_length;
-
- col_set_str(pinfo->cinfo, COL_PROTOCOL, "VPP-Trace");
- col_clear(pinfo->cinfo, COL_INFO);
-
- ti = proto_tree_add_item(tree, proto_vpp_trace, tvb, offset, -1, ENC_NA);
- trace_tree = proto_item_add_subtree(ti, ett_vpp_trace);
-
- /* How long is the trace string? */
- trace_string_length = tvb_strsize (tvb, offset);
-
- add_multi_line_string_to_tree (trace_tree, tvb, 0,
- trace_string_length,
- hf_vpp_buffer_trace);
- return tvb_captured_length(tvb);
-}
-
-
-static int
-dissect_vpp_opaque (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
- void* data _U_)
-{
- int offset = 0;
- proto_item *ti;
- proto_tree *opaque_tree;
- gint opaque_string_length;
-
- col_set_str(pinfo->cinfo, COL_PROTOCOL, "VPP-Opaque");
- col_clear(pinfo->cinfo, COL_INFO);
-
- ti = proto_tree_add_item(tree, proto_vpp_opaque, tvb, offset, -1, ENC_NA);
- opaque_tree = proto_item_add_subtree(ti, ett_vpp_opaque);
-
- opaque_string_length = tvb_strsize (tvb, offset);
- add_multi_line_string_to_tree (opaque_tree, tvb, 0, opaque_string_length,
- hf_vpp_buffer_opaque);
-
- return tvb_captured_length(tvb);
-}
-
-static int
-dissect_vpp_opaque2 (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
- void* data _U_)
-{
- int offset = 0;
- proto_item *ti;
- proto_tree *opaque2_tree;
- gint opaque2_string_length;
-
- col_set_str(pinfo->cinfo, COL_PROTOCOL, "VPP-Opaque2");
- col_clear(pinfo->cinfo, COL_INFO);
-
- ti = proto_tree_add_item(tree, proto_vpp_opaque2, tvb, offset, -1, ENC_NA);
- opaque2_tree = proto_item_add_subtree(ti, ett_vpp_opaque2);
-
- opaque2_string_length = tvb_strsize (tvb, offset);
- add_multi_line_string_to_tree (opaque2_tree, tvb, 0, opaque2_string_length,
- hf_vpp_buffer_opaque2);
-
- return tvb_captured_length(tvb);
-}
-
-
-static int
-dissect_vpp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
-{
- proto_item *ti;
- proto_tree *vpp_tree;
- tvbuff_t *metadata_tvb, *opaque_tvb, *opaque2_tvb, *eth_tvb, *trace_tvb;
- int offset = 0;
- guint8 major_version, minor_version, string_count, protocol_hint;
- guint8 *name;
- guint len;
- guint8 maybe_protocol_id;
- dissector_handle_t use_this_dissector;
-
- col_set_str(pinfo->cinfo, COL_PROTOCOL, "VPP");
- col_clear(pinfo->cinfo, COL_INFO);
-
- ti = proto_tree_add_item(tree, proto_vpp, tvb, offset, -1, ENC_NA);
- vpp_tree = proto_item_add_subtree(ti, ett_vpp);
-
- major_version = tvb_get_guint8 (tvb, offset);
- offset++;
-
- minor_version = tvb_get_guint8 (tvb, offset);
- offset++;
-
- if (major_version != 1 || minor_version != 0)
- ws_debug_printf ("WARNING: version mismatch (%d, %d)",
- major_version, minor_version);
-
- /* Number of counted strings in this trace record */
- string_count = tvb_get_guint8 (tvb, offset);
- offset++;
-
- /*
- * Hint: protocol which should be at b->data[b->current_data]
- * It will be a while before vpp sends useful hints for every
- * possible node, see heuristic below
- */
- protocol_hint = tvb_get_guint8 (tvb, offset);
- offset++;
-
- /* Buffer Index */
- proto_tree_add_item(vpp_tree, hf_vpp_buffer_index, tvb,
- offset, 4, ENC_BIG_ENDIAN);
- offset += 4;
-
- /* Nodename */
- len = tvb_strsize (tvb, offset);
- name = tvb_get_string_enc (wmem_packet_scope(), tvb, offset, len,
- ENC_ASCII);
- proto_tree_add_string (tree, hf_vpp_nodename, tvb, offset, len, name);
- offset += len;
-
- /* Metadata */
- len = tvb_strsize (tvb, offset);
- metadata_tvb = tvb_new_subset_remaining (tvb, offset);
- call_dissector (vpp_metadata_dissector_handle, metadata_tvb, pinfo, tree);
- offset += len;
-
- /* Opaque */
- len = tvb_strsize (tvb, offset);
- opaque_tvb = tvb_new_subset_remaining (tvb, offset);
- call_dissector (vpp_opaque_dissector_handle, opaque_tvb, pinfo, tree);
- offset += len;
-
- /* Opaque2 */
- len = tvb_strsize (tvb, offset);
- opaque2_tvb = tvb_new_subset_remaining (tvb, offset);
- call_dissector (vpp_opaque2_dissector_handle, opaque2_tvb, pinfo, tree);
- offset += len;
-
- /* Trace, if present */
- if (string_count > 4)
- {
- len = tvb_strsize (tvb, offset);
- trace_tvb = tvb_new_subset_remaining (tvb, offset);
- call_dissector (vpp_trace_dissector_handle, trace_tvb, pinfo, tree);
- offset += len;
- }
-
- eth_tvb = tvb_new_subset_remaining (tvb, offset);
-
- /*
- * Delegate the rest of the packet dissection to the per-node
- * next dissector in the foreach_node_to_dissector_pair list
- *
- * Failing that, pretend its an ethernet packet
- */
- if (protocol_hint >= array_length(next_dissectors)) {
- ws_debug_printf ("protocol_hint %d out of range (max %d)",
- (int) protocol_hint,
- (int) array_length(next_dissectors));
- protocol_hint = 0;
- }
- /* See setup for hint == 0 below */
- use_this_dissector = next_dissectors [protocol_hint];
- if (protocol_hint == 0) {
- maybe_protocol_id = tvb_get_guint8 (tvb, offset);
-
- switch (maybe_protocol_id) {
- case 0x45:
- use_this_dissector = next_dissectors[VLIB_NODE_PROTO_HINT_IP4];
- break;
- case 0x60:
- use_this_dissector = next_dissectors[VLIB_NODE_PROTO_HINT_IP6];
- break;
- default:
- break;
- }
- }
- call_dissector (use_this_dissector, eth_tvb, pinfo, tree);
- return tvb_captured_length(tvb);
-}
-
-void
-proto_register_vpp(void)
-{
- static hf_register_info vpp_hf[] = {
- { &hf_vpp_buffer_index,
- { "BufferIndex", "vpp.BufferIndex", FT_UINT32, BASE_HEX, NULL, 0x0,
- NULL, HFILL },
- },
- { &hf_vpp_nodename,
- { "NodeName", "vpp.NodeName", FT_STRINGZ, BASE_NONE, NULL, 0x0,
- NULL, HFILL },
- },
- };
-
- static hf_register_info metadata_hf[] = {
- { &hf_vpp_metadata,
- { "Metadata", "vpp.metadata",
- FT_STRINGZ, BASE_NONE, NULL, 0x0, NULL, HFILL },
- },
- };
-
- static hf_register_info opaque_hf[] = {
- { &hf_vpp_buffer_opaque,
- { "Opaque", "vpp.opaque",
- FT_STRINGZ, BASE_NONE, NULL, 0x0, NULL, HFILL },
- },
- };
-
- static hf_register_info opaque2_hf[] = {
- { &hf_vpp_buffer_opaque2,
- { "Opaque2", "vpp.opaque2",
- FT_STRINGZ, BASE_NONE, NULL, 0x0, NULL, HFILL },
- },
- };
-
- static hf_register_info trace_hf[] = {
- { &hf_vpp_buffer_trace,
- { "Trace", "vpp.trace", FT_STRINGZ, BASE_NONE, NULL, 0x0,
- NULL, HFILL },
- },
- };
-
- static gint *vpp_ett[] = {
- &ett_vpp,
- };
- static gint *ett_metadata[] = {
- &ett_vpp_metadata,
- };
- static gint *ett_opaque[] = {
- &ett_vpp_opaque,
- };
- static gint *ett_opaque2[] = {
- &ett_vpp_opaque2,
- };
- static gint *ett_trace[] = {
- &ett_vpp_trace,
- };
-
- proto_vpp = proto_register_protocol("VPP Dispatch Trace", "VPP", "vpp");
- proto_register_field_array(proto_vpp, vpp_hf, array_length(vpp_hf));
- proto_register_subtree_array (vpp_ett, array_length(vpp_ett));
- register_dissector("vpp", dissect_vpp, proto_vpp);
-
- proto_vpp_metadata = proto_register_protocol("VPP Buffer Metadata",
- "VPP-Metadata",
- "vpp-metadata");
- proto_register_field_array(proto_vpp_metadata, metadata_hf,
- array_length(metadata_hf));
- proto_register_subtree_array (ett_metadata, array_length(ett_metadata));
- register_dissector("vppMetadata", dissect_vpp_metadata, proto_vpp_metadata);
-
- proto_vpp_opaque = proto_register_protocol("VPP Buffer Opaque", "VPP-Opaque",
- "vpp-opaque");
- proto_register_field_array(proto_vpp_opaque, opaque_hf,
- array_length(opaque_hf));
- proto_register_subtree_array (ett_opaque, array_length(ett_opaque));
- register_dissector("vppOpaque", dissect_vpp_opaque, proto_vpp_opaque);
-
- proto_vpp_opaque2 = proto_register_protocol("VPP Buffer Opaque2", "VPP-Opaque2",
- "vpp-opaque2");
- proto_register_field_array(proto_vpp_opaque2, opaque2_hf,
- array_length(opaque2_hf));
- proto_register_subtree_array (ett_opaque2, array_length(ett_opaque2));
- register_dissector("vppOpaque2", dissect_vpp_opaque2, proto_vpp_opaque2);
-
-
- proto_vpp_trace = proto_register_protocol("VPP Buffer Trace", "VPP-Trace",
- "vpp-trace");
- proto_register_field_array(proto_vpp_trace, trace_hf,
- array_length(trace_hf));
- proto_register_subtree_array (ett_trace, array_length(ett_trace));
- register_dissector("vppTrace", dissect_vpp_trace, proto_vpp_trace);
-
-#define _(idx,dname) next_dissectors[idx] = find_dissector (#dname);
- foreach_next_dissector;
-#undef _
-
- /* if all else fails, dissect data as if ethernet MAC */
- next_dissectors[VLIB_NODE_PROTO_HINT_NONE] =
- next_dissectors [VLIB_NODE_PROTO_HINT_ETHERNET];
-}
-
-void
-proto_reg_handoff_vpp(void)
-{
- vpp_dissector_handle = find_dissector("vpp");
- vpp_metadata_dissector_handle = find_dissector("vppMetadata");
- vpp_opaque_dissector_handle = find_dissector("vppOpaque");
- vpp_opaque2_dissector_handle = find_dissector("vppOpaque2");
- vpp_trace_dissector_handle = find_dissector("vppTrace");
- dissector_add_uint("wtap_encap", WTAP_ENCAP_VPP, vpp_dissector_handle);
-}
-
-/*
- * Editor modelines - http://www.wireshark.org/tools/modelines.html
- *
- * Local variables:
- * c-basic-offset: 4
- * tab-width: 8
- * indent-tabs-mode: nil
- * End:
- *
- * vi: set shiftwidth=4 tabstop=8 expandtab:
- * :indentSize=4:tabSize=8:noTabs=true:
- */
Code Review / vpp.git / commitdiff