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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
commit | e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch) | |
tree | 68cb5ef9081156392f1dd62a00c6ccc1451b93df /epan/dissectors/packet-vsock.c | |
parent | Initial commit. (diff) | |
download | wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip |
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'epan/dissectors/packet-vsock.c')
-rw-r--r-- | epan/dissectors/packet-vsock.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/epan/dissectors/packet-vsock.c b/epan/dissectors/packet-vsock.c new file mode 100644 index 00000000..689d7cbf --- /dev/null +++ b/epan/dissectors/packet-vsock.c @@ -0,0 +1,326 @@ +/* packet-vsock.c + * Routines for AF_VSOCK dissection + * Copyright 2016, Gerard Garcia <ggarcia@deic.uab.cat> + * + * Header definition: + * https://github.com/GerardGarcia/linux/blob/vsockmon/include/uapi/linux/vsockmon.h + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +/* + * The AF_VSOCK socket allows zero-configuration communication between guests + * and hypervisors using the standard socket API. + */ + +#include <config.h> +#include <epan/packet.h> +#include <wsutil/pint.h> +#include <epan/address_types.h> +#include <wiretap/wtap.h> + +void proto_register_vsock(void); +void proto_reg_handoff_vsock(void); + +static int proto_vsock = -1; +static int vsock_address_type = -1; +static dissector_handle_t vsock_handle; + +/* Generic header related fields */ +static int hf_vsock_src_cid = -1; +static int hf_vsock_src_port = -1; +static int hf_vsock_dst_cid = -1; +static int hf_vsock_dst_port = -1; +static int hf_vsock_op = -1; +static int hf_vsock_t = -1; +static int hf_vsock_t_len = -1; +static int hf_vsock_reserved = -1; +static int hf_vsock_payload = -1; + +/* Virtio related fields */ +static int hf_virtio_src_cid = -1; +static int hf_virtio_dst_cid = -1; +static int hf_virtio_src_port = -1; +static int hf_virtio_dst_port = -1; +static int hf_virtio_len = -1; +static int hf_virtio_type = -1; +static int hf_virtio_op = -1; +static int hf_virtio_flags = -1; +static int hf_virtio_buf_alloc = -1; +static int hf_virtio_fwd_cnt = -1; + +static gint ett_vsock = -1; +static gint ett_virtio = -1; + +static const value_string af_vsockmon_op_names[] = { + { 0, "Unknown" }, + { 1, "Connect" }, + { 2, "Disconnect" }, + { 3, "Control" }, + { 4, "Payload" }, + { 0, NULL } +}; + +enum af_vsockmon_t { + AF_VSOCK_T_UNKNOWN = 0, + AF_VSOCK_T_NO_INFO = 1, + AF_VSOCK_T_VIRTIO = 2 +}; + +static const value_string af_vsockmon_t_names[] = { + { 0, "Unknown" }, + { 1, "No info" }, + { 2, "Virtio" }, + { 0 , NULL } +}; + +static const value_string virtio_vsock_type_names[] = { + { 1, "Stream"}, + { 0, NULL } +}; + +static const value_string virtio_vsock_op_names[] = { + { 0, "Invalid" }, + { 1, "Request" }, + { 2, "Response" }, + { 3, "Rst" }, + { 4, "Shutdown" }, + { 5, "RW" }, + { 6, "Credit update" }, + { 7, "Credit response" }, + { 0 , NULL } +}; + +#define VSOCK_MIN_LENGTH 32 + +static int vsock_addr_to_str(const address* addr, gchar *buf, int buf_len) +{ + const guint8 *addrp = (const guint8 *)addr->data; + + if(pletoh64(&addrp[0])==2){ + (void) g_strlcpy(buf, "host", buf_len); + } else { + snprintf(buf, buf_len, "%" PRIu64, pletoh64(&addrp[0])); + } + + return (int)(strlen(buf)+1); +} + +static int vsock_addr_str_len(const address* addr _U_) +{ + /* 2^64 unsigned int len */ + return 19; +} + +static int +dissect_vsock(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, + void *data _U_) +{ + proto_item *ti, *virtio_ti; + proto_tree *vsock_tree, *virtio_tree; + + guint32 t_len, payload_len, virtio_buf_alloc, op, type, + virtio_fwd_cnt, virtio_op, virtio_type; + guint16 payload_offset = 0, offset = 0; + + if (tvb_reported_length(tvb) < VSOCK_MIN_LENGTH) + return 0; + + /* Clear column information before start parsing */ + col_clear(pinfo->cinfo, COL_INFO); + + /* Create top tree */ + ti = proto_tree_add_item(tree, proto_vsock, tvb, 0, -1, ENC_NA); + vsock_tree = proto_item_add_subtree(ti, ett_vsock); + + /* Parse generic header part */ + proto_tree_add_item(vsock_tree, hf_vsock_src_cid, tvb, offset, 8, ENC_LITTLE_ENDIAN); + set_address_tvb(&pinfo->src, vsock_address_type, 8, tvb, offset); + offset += 8; + + proto_tree_add_item(vsock_tree, hf_vsock_dst_cid, tvb, offset, 8, ENC_LITTLE_ENDIAN); + set_address_tvb(&pinfo->dst, vsock_address_type, 8, tvb, offset); + offset += 8; + + proto_tree_add_item_ret_uint(vsock_tree, hf_vsock_src_port, tvb, offset, 4, ENC_LITTLE_ENDIAN, &pinfo->srcport); + offset += 4; + + proto_tree_add_item_ret_uint(vsock_tree, hf_vsock_dst_port, tvb, offset, 4, ENC_LITTLE_ENDIAN, &pinfo->destport); + offset += 4; + + proto_tree_add_item_ret_uint(vsock_tree, hf_vsock_op, tvb, offset, 2, ENC_LITTLE_ENDIAN, &op); + offset += 2; + + proto_tree_add_item_ret_uint(vsock_tree, hf_vsock_t, tvb, offset, 2, ENC_LITTLE_ENDIAN, &type); + offset += 2; + + proto_tree_add_item_ret_uint(vsock_tree, hf_vsock_t_len, tvb, offset, 2, ENC_LITTLE_ENDIAN, &t_len); + offset += 2; + + proto_tree_add_item(vsock_tree, hf_vsock_reserved, tvb, offset, 2, ENC_NA); + offset += 2; + + payload_offset = offset + t_len; + + /* Append summary information to top tree */ + proto_item_append_text(ti, ", Op: %s, Transport: %s", + val_to_str(op, af_vsockmon_op_names, "Unknown (%d)"), + val_to_str(type, af_vsockmon_t_names, "Unknown (%d)")); + + /* Fill columns */ + col_add_fstr(pinfo->cinfo, COL_INFO, "[%s] %s", + val_to_str(op, af_vsockmon_op_names, "Unknown (%d)"), + val_to_str(type, af_vsockmon_t_names, "Unknown (%d)")); + col_set_str(pinfo->cinfo, COL_PROTOCOL, "vSocket"); + + /* Create subtree if there is transport information */ + switch (type) { + case AF_VSOCK_T_UNKNOWN: + case AF_VSOCK_T_NO_INFO: + break; + case AF_VSOCK_T_VIRTIO: + virtio_tree = proto_tree_add_subtree(vsock_tree, tvb, offset, 44, ett_virtio, &virtio_ti, "Virtio transport header"); + + proto_tree_add_item(virtio_tree, hf_virtio_src_cid, tvb, offset, 8, ENC_LITTLE_ENDIAN); + offset += 8; + proto_tree_add_item(virtio_tree, hf_virtio_dst_cid, tvb, offset, 8, ENC_LITTLE_ENDIAN); + offset += 8; + proto_tree_add_item(virtio_tree, hf_virtio_src_port, tvb, offset, 4, ENC_LITTLE_ENDIAN); + offset += 4; + proto_tree_add_item(virtio_tree, hf_virtio_dst_port, tvb, offset, 4, ENC_LITTLE_ENDIAN); + offset += 4; + proto_tree_add_item(virtio_tree, hf_virtio_len, tvb, offset, 4, ENC_LITTLE_ENDIAN); + offset += 4; + + proto_tree_add_item_ret_uint(virtio_tree, hf_virtio_type, tvb, offset, 2, ENC_LITTLE_ENDIAN, &virtio_type); + offset += 2; + + proto_tree_add_item_ret_uint(virtio_tree, hf_virtio_op, tvb, offset, 2, ENC_LITTLE_ENDIAN, &virtio_op); + offset += 2; + + proto_tree_add_item(virtio_tree, hf_virtio_flags, tvb, offset, 4, ENC_LITTLE_ENDIAN); + offset += 4; + + proto_tree_add_item_ret_uint(virtio_tree, hf_virtio_buf_alloc, tvb, offset, 4, ENC_LITTLE_ENDIAN, &virtio_buf_alloc); + offset += 4; + + proto_tree_add_item_ret_uint(virtio_tree, hf_virtio_fwd_cnt, tvb, offset, 4, ENC_LITTLE_ENDIAN, &virtio_fwd_cnt); + /*offset += 4;*/ + + /* Append virtio information */ + col_append_fstr(pinfo->cinfo, COL_INFO, ": %s, Op: %s, Buf alloc: %u, Fwd cnt: %u", + val_to_str(virtio_type, virtio_vsock_type_names, "Unknown (%d)"), + val_to_str(virtio_op, virtio_vsock_op_names, "Unknown (%d)"), + virtio_buf_alloc, virtio_fwd_cnt); + break; + } + + + /* Append payload */ + payload_len = tvb_reported_length_remaining(tvb, payload_offset); + if (payload_len) + proto_tree_add_bytes_format(vsock_tree, hf_vsock_payload, tvb, payload_offset, payload_len, + NULL, "Payload (%uB)", payload_len); + + return tvb_reported_length(tvb); +} + +void +proto_register_vsock(void) +{ + static hf_register_info hf[] = { + { &hf_vsock_src_cid, + {"Source cid", "vsock.src_cid", FT_UINT64, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_vsock_dst_cid, + {"Destination cid", "vsock.dst_cid", FT_UINT64, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_vsock_src_port, + {"Source port", "vsock.src_port", FT_UINT32, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_vsock_dst_port, + {"Destination port", "vsock.dst_port", FT_UINT32, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_vsock_op, + {"Operation", "vsock.op", FT_UINT16, BASE_DEC, VALS(af_vsockmon_op_names), + 0x0, NULL, HFILL }}, + { &hf_vsock_t, + {"Transport", "vsock.trans", FT_UINT16, BASE_DEC, VALS(af_vsockmon_t_names), + 0x0, NULL, HFILL }}, + { &hf_vsock_t_len, + {"Transport length", "vsock.trans_len", FT_UINT16, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_vsock_reserved, + {"Reserved", "vsock.reserved", FT_BYTES, BASE_NONE, NULL, + 0x0, NULL, HFILL }}, + { &hf_vsock_payload, + { "Payload", "vsock.payload", FT_BYTES, BASE_NONE, NULL, + 0x0, NULL, HFILL}}, + { &hf_virtio_src_cid, + {"Source cid", "vsock.virtio.src_cid", FT_UINT64, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_virtio_dst_cid, + {"Destination cid", "vsock.virtio.dst_cid", FT_UINT64, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_virtio_src_port, + {"Source port", "vsock.virtio.src_prot", FT_UINT32, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_virtio_dst_port, + {"Destination port", "vsock.virtio.dst_prot", FT_UINT32, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_virtio_len, + {"Length", "vsock.virtio.len", FT_UINT32, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_virtio_type, + {"Type", "vsock.virtio.type", FT_UINT16, BASE_DEC, VALS(virtio_vsock_type_names), + 0x0, NULL, HFILL }}, + { &hf_virtio_op, + {"Operation", "vsock.virtio.op", FT_UINT16, BASE_DEC, VALS(virtio_vsock_op_names), + 0x0, NULL, HFILL }}, + { &hf_virtio_flags, + {"Flags", "vsock.virtio.flags", FT_UINT32, BASE_HEX, NULL, + 0x0, NULL, HFILL }}, + { &hf_virtio_buf_alloc, + {"Buf alloc", "vsock.virtio.buf_alloc", FT_UINT32, BASE_DEC, NULL, + 0x0, NULL, HFILL }}, + { &hf_virtio_fwd_cnt, + {"Fwd cnt", "vsock.virtio.fwd_cnt", FT_UINT32, BASE_DEC, NULL, + 0x0, NULL, HFILL }} + }; + static gint *ett[] = { + &ett_vsock, + &ett_virtio + }; + + vsock_address_type = address_type_dissector_register("AT_VSOCK", "vSocket Address", + vsock_addr_to_str, vsock_addr_str_len, NULL, NULL, NULL, NULL, NULL); + + proto_vsock = proto_register_protocol("vSocket", "vsock", "vsock"); + proto_register_field_array(proto_vsock, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + vsock_handle = register_dissector("vsock", dissect_vsock, proto_vsock); +} + +void +proto_reg_handoff_vsock(void) +{ + dissector_add_uint("wtap_encap", WTAP_ENCAP_VSOCK, vsock_handle); +} + +/* + * Editor modelines - https://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: + */ |