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wireshark/SOURCES/wireshark-0026-mptcp.patch
CentOS Sources 4ac11104d1 import wireshark-2.6.2-14.el8
2021-12-08 12:28:26 +00:00

876 lines
38 KiB
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diff --git a/epan/dissectors/packet-tcp.c b/epan/dissectors/packet-tcp.c
index 36e8afb2a3..73f4a2647a 100644
--- a/epan/dissectors/packet-tcp.c
+++ b/epan/dissectors/packet-tcp.c
@@ -285,7 +285,9 @@ static int hf_mptcp_analysis_subflows_stream_id = -1;
static int hf_mptcp_analysis_subflows = -1;
static int hf_mptcp_number_of_removed_addresses = -1;
static int hf_mptcp_related_mapping = -1;
-static int hf_mptcp_duplicated_data = -1;
+static int hf_mptcp_reinjection_of = -1;
+static int hf_mptcp_reinjected_in = -1;
+
static int hf_tcp_option_fast_open_cookie_request = -1;
static int hf_tcp_option_fast_open_cookie = -1;
@@ -1455,8 +1457,8 @@ mptcp_init_subflow(tcp_flow_t *flow)
DISSECTOR_ASSERT(flow->mptcp_subflow == 0);
flow->mptcp_subflow = sf;
- sf->mappings = wmem_itree_new(wmem_file_scope());
- sf->dsn_map = wmem_itree_new(wmem_file_scope());
+ sf->ssn2dsn_mappings = wmem_itree_new(wmem_file_scope());
+ sf->dsn2packet_map = wmem_itree_new(wmem_file_scope());
}
@@ -2607,13 +2609,13 @@ guint64 rawdsn64low, guint64 rawdsn64high
mptcp_dsn2packet_mapping_t *packet = NULL;
proto_item *item = NULL;
- results = wmem_itree_find_intervals(subflow->mappings,
+ results = wmem_itree_find_intervals(subflow->dsn2packet_map,
wmem_packet_scope(),
rawdsn64low,
rawdsn64high
);
- for(packet_it=wmem_list_head(results);
+ for(packet_it = wmem_list_head(results);
packet_it != NULL;
packet_it = wmem_list_frame_next(packet_it))
{
@@ -2621,43 +2623,18 @@ guint64 rawdsn64low, guint64 rawdsn64high
packet = (mptcp_dsn2packet_mapping_t *) wmem_list_frame_data(packet_it);
DISSECTOR_ASSERT(packet);
- item = proto_tree_add_uint(tree, hf_mptcp_duplicated_data, tvb, 0, 0, packet->frame);
+ if(pinfo->num > packet->frame) {
+ item = proto_tree_add_uint(tree, hf_mptcp_reinjection_of, tvb, 0, 0, packet->frame);
+ }
+ else {
+ item = proto_tree_add_uint(tree, hf_mptcp_reinjected_in, tvb, 0, 0, packet->frame);
+ }
PROTO_ITEM_SET_GENERATED(item);
}
return packet;
}
-/* Finds mappings that cover the sent data */
-static mptcp_dss_mapping_t *
-mptcp_add_matching_dss_on_subflow(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, struct mptcp_subflow *subflow,
-guint32 relseq, guint32 seglen
-)
-{
- wmem_list_t *results = NULL;
- wmem_list_frame_t *dss_it = NULL;
- mptcp_dss_mapping_t *mapping = NULL;
- proto_item *item = NULL;
-
- results = wmem_itree_find_intervals(subflow->mappings,
- wmem_packet_scope(),
- relseq,
- (seglen) ? relseq + seglen - 1 : relseq
- );
-
- for(dss_it=wmem_list_head(results);
- dss_it!= NULL;
- dss_it= wmem_list_frame_next(dss_it))
- {
- mapping = (mptcp_dss_mapping_t *) wmem_list_frame_data(dss_it);
- DISSECTOR_ASSERT(mapping);
-
- item = proto_tree_add_uint(tree, hf_mptcp_related_mapping, tvb, 0, 0, mapping->frame);
- PROTO_ITEM_SET_GENERATED(item);
- }
-
- return mapping;
-}
/* Lookup mappings that describe the packet and then converts the tcp seq number
* into the MPTCP Data Sequence Number (DSN)
@@ -2698,13 +2675,29 @@ mptcp_analysis_dsn_lookup(packet_info *pinfo , tvbuff_t *tvb,
rawdsn = tcpd->fwd->mptcp_subflow->meta->base_dsn;
convert = DSN_CONV_NONE;
}
+ /* if it's a non-syn packet without data (just used to convey TCP options)
+ * then there would be no mappings */
+ else if(relseq == 1 && tcph->th_seglen == 0) {
+ rawdsn = tcpd->fwd->mptcp_subflow->meta->base_dsn + 1;
+ convert = DSN_CONV_NONE;
+ }
else {
- /* display packets that conveyed the mappings covering the data range */
- mapping = mptcp_add_matching_dss_on_subflow(pinfo, parent_tree, tvb,
- tcpd->fwd->mptcp_subflow, relseq,
- (tcph->th_have_seglen) ? tcph->th_seglen : 0
- );
- if(mapping == NULL) {
+
+ wmem_list_frame_t *dss_it = NULL;
+ wmem_list_t *results = NULL;
+ guint32 ssn_low = relseq;
+ guint32 seglen = tcph->th_seglen;
+
+ results = wmem_itree_find_intervals(tcpd->fwd->mptcp_subflow->ssn2dsn_mappings,
+ wmem_packet_scope(),
+ ssn_low,
+ (seglen) ? ssn_low + seglen - 1 : ssn_low
+ );
+ dss_it = wmem_list_head(results); /* assume it's always ok */
+ if(dss_it) {
+ mapping = (mptcp_dss_mapping_t *) wmem_list_frame_data(dss_it);
+ }
+ if(dss_it == NULL || mapping == NULL) {
expert_add_info(pinfo, parent_tree, &ei_mptcp_mapping_missing);
return;
}
@@ -2713,6 +2706,19 @@ mptcp_analysis_dsn_lookup(packet_info *pinfo , tvbuff_t *tvb,
}
DISSECTOR_ASSERT(mapping);
+ if(seglen) {
+ /* Finds mappings that cover the sent data and adds them to the dissection tree */
+ for(dss_it = wmem_list_head(results);
+ dss_it != NULL;
+ dss_it = wmem_list_frame_next(dss_it))
+ {
+ mapping = (mptcp_dss_mapping_t *) wmem_list_frame_data(dss_it);
+ DISSECTOR_ASSERT(mapping);
+
+ item = proto_tree_add_uint(parent_tree, hf_mptcp_related_mapping, tvb, 0, 0, mapping->frame);
+ PROTO_ITEM_SET_GENERATED(item);
+ }
+ }
convert = (mapping->extended_dsn) ? DSN_CONV_NONE : DSN_CONV_32_TO_64;
DISSECTOR_ASSERT(mptcp_map_relssn_to_rawdsn(mapping, relseq, &rawdsn));
@@ -2732,39 +2738,40 @@ mptcp_analysis_dsn_lookup(packet_info *pinfo , tvbuff_t *tvb,
proto_item_append_text(item, " (Relative)");
}
- /* register */
- if (!PINFO_FD_VISITED(pinfo))
- {
- mptcp_dsn2packet_mapping_t *packet;
- packet = wmem_new0(wmem_file_scope(), mptcp_dsn2packet_mapping_t);
- packet->frame = pinfo->fd->num;
- packet->subflow = tcpd;
-
- /* tcph->th_mptcp->mh_rawdsn64 */
- if (tcph->th_have_seglen) {
- wmem_itree_insert(tcpd->fwd->mptcp_subflow->dsn_map,
+ /* register dsn->packet mapping */
+ if(mptcp_intersubflows_retransmission
+ && !PINFO_FD_VISITED(pinfo)
+ && tcph->th_seglen > 0
+ ) {
+ mptcp_dsn2packet_mapping_t *packet = 0;
+ packet = wmem_new0(wmem_file_scope(), mptcp_dsn2packet_mapping_t);
+ packet->frame = pinfo->fd->num;
+ packet->subflow = tcpd;
+
+ wmem_itree_insert(tcpd->fwd->mptcp_subflow->dsn2packet_map,
tcph->th_mptcp->mh_rawdsn64,
tcph->th_mptcp->mh_rawdsn64 + (tcph->th_seglen - 1 ),
packet
);
- }
}
PROTO_ITEM_SET_GENERATED(item);
/* We can do this only if rawdsn64 is valid !
if enabled, look for overlapping mappings on other subflows */
- if(mptcp_intersubflows_retransmission) {
+ if(mptcp_intersubflows_retransmission
+ && tcph->th_have_seglen
+ && tcph->th_seglen) {
wmem_list_frame_t *subflow_it = NULL;
- /* results should be some kind of in case 2 DSS are needed to cover this packet */
+ /* results should be some kind of list in case 2 DSS are needed to cover this packet */
for(subflow_it = wmem_list_head(mptcpd->subflows); subflow_it != NULL; subflow_it = wmem_list_frame_next(subflow_it)) {
struct tcp_analysis *sf_tcpd = (struct tcp_analysis *)wmem_list_frame_data(subflow_it);
struct mptcp_subflow *sf = mptcp_select_subflow_from_meta(sf_tcpd, tcpd->fwd->mptcp_subflow->meta);
/* for current subflow */
if (sf == tcpd->fwd->mptcp_subflow) {
- /* skip, was done just before */
+ /* skip, this is the current subflow */
}
/* in case there were retransmissions on other subflows */
else {
@@ -2776,7 +2783,7 @@ mptcp_analysis_dsn_lookup(packet_info *pinfo , tvbuff_t *tvb,
}
}
else {
- /* ignore and continue */
+ /* could not get the rawdsn64, ignore and continue */
}
}
@@ -4590,7 +4597,6 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
if (!PINFO_FD_VISITED(pinfo))
{
-
/* register SSN range described by the mapping into a subflow interval_tree */
mptcp_dss_mapping_t *mapping = NULL;
mapping = wmem_new0(wmem_file_scope(), mptcp_dss_mapping_t);
@@ -4601,7 +4607,7 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
mapping->ssn_low = mph->mh_dss_ssn;
mapping->ssn_high = mph->mh_dss_ssn + mph->mh_dss_length-1;
- wmem_itree_insert(tcpd->fwd->mptcp_subflow->mappings,
+ wmem_itree_insert(tcpd->fwd->mptcp_subflow->ssn2dsn_mappings,
mph->mh_dss_ssn,
mapping->ssn_high,
mapping
@@ -7564,15 +7570,19 @@ proto_register_tcp(void)
"This frame has some of the MPTCP analysis shown", HFILL }},
{ &hf_mptcp_related_mapping,
- { "Related mapping", "mptcp.related_mapping", FT_FRAMENUM , BASE_NONE, NULL, 0x0,
- "Packet in which mapping describing current packet was sent", HFILL }},
+ { "Related mapping", "mptcp.related_mapping", FT_FRAMENUM , BASE_NONE, NULL, 0x0,
+ "Packet in which current packet DSS mapping was sent", HFILL }},
+
+ { &hf_mptcp_reinjection_of,
+ { "Reinjection of", "mptcp.reinjection_of", FT_FRAMENUM , BASE_NONE, NULL, 0x0,
+ "This is a retransmission of data sent on another subflow", HFILL }},
- { &hf_mptcp_duplicated_data,
- { "Was data duplicated", "mptcp.duplicated_dsn", FT_FRAMENUM , BASE_NONE, NULL, 0x0,
+ { &hf_mptcp_reinjected_in,
+ { "Data reinjected in", "mptcp.reinjected_in", FT_FRAMENUM , BASE_NONE, NULL, 0x0,
"This was retransmitted on another subflow", HFILL }},
{ &hf_mptcp_analysis_subflows,
- { "TCP subflow stream id(s):", "mptcp.analysis.subflows", FT_NONE, BASE_NONE, NULL, 0x0,
+ { "TCP subflow stream id(s):", "mptcp.analysis.subflows", FT_NONE, BASE_NONE, NULL, 0x0,
"List all TCP connections mapped to this MPTCP connection", HFILL }},
{ &hf_mptcp_stream,
@@ -7752,13 +7762,16 @@ proto_register_tcp(void)
&mptcp_relative_seq);
prefs_register_bool_preference(mptcp_module, "analyze_mappings",
- "In depth analysis of Data Sequence Signal (DSS) mappings.",
+ "Deeper analysis of Data Sequence Signal (DSS)",
+ "Scales logarithmically with the number of packets"
"You need to capture the handshake for this to work."
"\"Map TCP subflows to their respective MPTCP connections\"",
&mptcp_analyze_mappings);
prefs_register_bool_preference(mptcp_module, "intersubflows_retransmission",
"Check for data duplication across subflows",
+ "(Greedy algorithm: Scales linearly with number of subflows and"
+ " logarithmic scaling with number of packets)"
"You need to enable DSS mapping analysis for this option to work",
&mptcp_intersubflows_retransmission);
diff --git a/epan/dissectors/packet-tcp.h b/epan/dissectors/packet-tcp.h
index 7f84351ade..c1811fa049 100644
--- a/epan/dissectors/packet-tcp.h
+++ b/epan/dissectors/packet-tcp.h
@@ -257,15 +257,16 @@ struct mptcp_subflow {
guint8 address_id; /* sent during an MP_JOIN */
- /* Attempt to map DSN to packets
- * Ideally this was to generate application latency
- * each node contains a GSList * ?
- * this should be done in tap or 3rd party tools
+ /* map DSN to packets
+ * Used when looking for reinjections across subflows
*/
- wmem_itree_t *dsn_map;
+ wmem_itree_t *dsn2packet_map;
- /* Map SSN to a DSS mappings, each node registers a mptcp_dss_mapping_t */
- wmem_itree_t *mappings;
+ /* Map SSN to a DSS mappings
+ * a DSS can map DSN to SSNs possibily over several packets,
+ * hence some packets may have been mapped by previous DSS,
+ * whence the necessity to be able to look for SSN -> DSN */
+ wmem_itree_t *ssn2dsn_mappings;
/* meta flow to which it is attached. Helps setting forward and backward meta flow */
mptcp_meta_flow_t *meta;
};
diff --git a/epan/wmem/wmem_interval_tree.c b/epan/wmem/wmem_interval_tree.c
index d52267de18..48888996b7 100644
--- a/epan/wmem/wmem_interval_tree.c
+++ b/epan/wmem/wmem_interval_tree.c
@@ -121,7 +121,7 @@ wmem_itree_insert(wmem_itree_t *tree, const guint64 low, const guint64 high, voi
node = wmem_tree_insert(tree, range, data, (compare_func)wmem_tree_compare_ranges);
/* Even If no rotations, still a need to update max_edge */
- update_max_edge(node);
+ update_max_edge(node->parent);
}
diff --git a/epan/dissectors/packet-tcp.c b/epan/dissectors/packet-tcp.c
index 74e9b6b10c..efcfa005af 100644
--- a/epan/dissectors/packet-tcp.c
+++ b/epan/dissectors/packet-tcp.c
@@ -4361,6 +4361,35 @@ get_or_create_mptcpd_from_key(struct tcp_analysis* tcpd, tcp_flow_t *fwd, guint6
return mptcpd;
}
+/* record this mapping */
+static
+void analyze_mapping(struct tcp_analysis *tcpd, packet_info *pinfo, guint16 len, guint64 dsn, gboolean extended, guint32 ssn) {
+
+ /* store mapping only if analysis is enabled and mapping is not unlimited */
+ if (!mptcp_analyze_mappings || !len) {
+ return;
+ }
+
+ if (PINFO_FD_VISITED(pinfo)) {
+ return;
+ }
+
+ /* register SSN range described by the mapping into a subflow interval_tree */
+ mptcp_dss_mapping_t *mapping = NULL;
+ mapping = wmem_new0(wmem_file_scope(), mptcp_dss_mapping_t);
+
+ mapping->rawdsn = dsn;
+ mapping->extended_dsn = extended;
+ mapping->frame = pinfo->fd->num;
+ mapping->ssn_low = ssn;
+ mapping->ssn_high = ssn + len - 1;
+
+ wmem_itree_insert(tcpd->fwd->mptcp_subflow->ssn2dsn_mappings,
+ mapping->ssn_low,
+ mapping->ssn_high,
+ mapping
+ );
+}
/*
* The TCP Extensions for Multipath Operation with Multiple Addresses
@@ -4449,8 +4478,11 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
}
offset += 1;
- /* optlen == 12 => SYN or SYN/ACK; optlen == 20 => ACK */
- if (optlen == 12 || optlen == 20) {
+ /* optlen == 12 => SYN or SYN/ACK; optlen == 20 => ACK;
+ * optlen == 22 => ACK + data (v1 only);
+ * optlen == 24 => ACK + data + csum (v1 only)
+ */
+ if (optlen == 12 || optlen == 20 || optlen == 22 || optlen == 24) {
mph->mh_key = tvb_get_ntoh64(tvb,offset);
proto_tree_add_uint64(mptcp_tree, hf_tcp_option_mptcp_sender_key, tvb, offset, 8, mph->mh_key);
@@ -4468,9 +4500,10 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
PROTO_ITEM_SET_GENERATED(item);
/* last ACK of 3WHS, repeats both keys */
- if (optlen == 20) {
+ if (optlen >= 20) {
guint64 recv_key = tvb_get_ntoh64(tvb,offset);
proto_tree_add_uint64(mptcp_tree, hf_tcp_option_mptcp_recv_key, tvb, offset, 8, recv_key);
+ offset += 8;
if(tcpd->rev->mptcp_subflow->meta
&& (tcpd->rev->mptcp_subflow->meta->static_flags & MPTCP_META_HAS_KEY)) {
@@ -4484,6 +4517,26 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
mptcpd = get_or_create_mptcpd_from_key(tcpd, tcpd->rev, recv_key, mph->mh_capable_flags & MPTCP_CAPABLE_CRYPTO_MASK);
}
}
+
+ /* MPTCP v1 ACK + data, contains data_len and optional checksum */
+ if (optlen >= 22) {
+ proto_tree_add_item(mptcp_tree, hf_tcp_option_mptcp_data_lvl_len, tvb, offset, 2, ENC_BIG_ENDIAN);
+ mph->mh_dss_length = tvb_get_ntohs(tvb,offset);
+ offset += 2;
+
+ if (mph->mh_dss_length == 0) {
+ expert_add_info(pinfo, mptcp_tree, &ei_mptcp_infinite_mapping);
+ }
+
+ /* when data len is present, this MP_CAPABLE also carries an implicit mapping ... */
+ analyze_mapping(tcpd, pinfo, mph->mh_dss_length, tcpd->fwd->mptcp_subflow->meta->base_dsn + 1, TRUE, tcph->th_seq);
+
+ /* ... with optional checksum */
+ if (optlen == 24)
+ {
+ proto_tree_add_checksum(mptcp_tree, tvb, offset, hf_tcp_option_mptcp_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
+ }
+ }
}
break;
@@ -4650,29 +4703,7 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
/* ignore and continue */
}
- /* if mapping analysis enabled and not a */
- if(mptcp_analyze_mappings && mph->mh_dss_length)
- {
-
- if (!PINFO_FD_VISITED(pinfo))
- {
- /* register SSN range described by the mapping into a subflow interval_tree */
- mptcp_dss_mapping_t *mapping = NULL;
- mapping = wmem_new0(wmem_file_scope(), mptcp_dss_mapping_t);
-
- mapping->rawdsn = mph->mh_dss_rawdsn;
- mapping->extended_dsn = (mph->mh_dss_flags & MPTCP_DSS_FLAG_DATA_ACK_8BYTES);
- mapping->frame = pinfo->fd->num;
- mapping->ssn_low = mph->mh_dss_ssn;
- mapping->ssn_high = mph->mh_dss_ssn + mph->mh_dss_length-1;
-
- wmem_itree_insert(tcpd->fwd->mptcp_subflow->ssn2dsn_mappings,
- mph->mh_dss_ssn,
- mapping->ssn_high,
- mapping
- );
- }
- }
+ analyze_mapping(tcpd, pinfo, mph->mh_dss_length, mph->mh_dss_rawdsn, mph->mh_dss_flags & MPTCP_DSS_FLAG_DATA_ACK_8BYTES, mph->mh_dss_ssn);
if ((int)optlen >= offset-start_offset+4)
{
diff --git a/epan/dissectors/packet-tcp.c b/epan/dissectors/packet-tcp.c
index efcfa005af..238b592927 100644
--- a/epan/dissectors/packet-tcp.c
+++ b/epan/dissectors/packet-tcp.c
@@ -246,7 +246,8 @@ static int hf_tcp_option_mptcp_flags = -1;
static int hf_tcp_option_mptcp_backup_flag = -1;
static int hf_tcp_option_mptcp_checksum_flag = -1;
static int hf_tcp_option_mptcp_B_flag = -1;
-static int hf_tcp_option_mptcp_H_flag = -1;
+static int hf_tcp_option_mptcp_H_v0_flag = -1;
+static int hf_tcp_option_mptcp_H_v1_flag = -1;
static int hf_tcp_option_mptcp_F_flag = -1;
static int hf_tcp_option_mptcp_m_flag = -1;
static int hf_tcp_option_mptcp_M_flag = -1;
@@ -593,10 +594,18 @@ static guint32 mptcp_stream_count;
*/
static wmem_tree_t *mptcp_tokens = NULL;
-static const int *tcp_option_mptcp_capable_flags[] = {
+static const int *tcp_option_mptcp_capable_v0_flags[] = {
&hf_tcp_option_mptcp_checksum_flag,
&hf_tcp_option_mptcp_B_flag,
- &hf_tcp_option_mptcp_H_flag,
+ &hf_tcp_option_mptcp_H_v0_flag,
+ &hf_tcp_option_mptcp_reserved_flag,
+ NULL
+};
+
+static const int *tcp_option_mptcp_capable_v1_flags[] = {
+ &hf_tcp_option_mptcp_checksum_flag,
+ &hf_tcp_option_mptcp_B_flag,
+ &hf_tcp_option_mptcp_H_v1_flag,
&hf_tcp_option_mptcp_reserved_flag,
NULL
};
@@ -2574,6 +2583,24 @@ mptcp_cryptodata_sha1(const guint64 key, guint32 *token, guint64 *idsn)
*idsn = GUINT64_FROM_BE(_isdn);
}
+/* Generate the initial data sequence number and MPTCP connection token from the key. */
+static void
+mptcp_cryptodata_sha256(const guint64 key, guint32 *token, guint64 *idsn)
+{
+ guint8 digest_buf[HASH_SHA2_256_LENGTH];
+ guint64 pseudokey = GUINT64_TO_BE(key);
+ guint32 _token;
+ guint64 _isdn;
+
+ gcry_md_hash_buffer(GCRY_MD_SHA256, digest_buf, (const guint8 *)&pseudokey, 8);
+
+ /* memcpy to prevent -Wstrict-aliasing errors with GCC 4 */
+ memcpy(&_token, digest_buf, sizeof(_token));
+ *token = GUINT32_FROM_BE(_token);
+ memcpy(&_isdn, digest_buf + HASH_SHA2_256_LENGTH - sizeof(_isdn), sizeof(_isdn));
+ *idsn = GUINT64_FROM_BE(_isdn);
+}
+
/* Print formatted list of tcp stream ids that are part of the connection */
static void
@@ -4338,7 +4365,7 @@ mptcp_get_meta_from_token(struct tcp_analysis* tcpd, tcp_flow_t *tcp_flow, guint
/* setup from_key */
static
struct mptcp_analysis*
-get_or_create_mptcpd_from_key(struct tcp_analysis* tcpd, tcp_flow_t *fwd, guint64 key, guint8 hmac_algo _U_) {
+get_or_create_mptcpd_from_key(struct tcp_analysis* tcpd, tcp_flow_t *fwd, guint8 version, guint64 key, guint8 hmac_algo _U_) {
guint32 token = 0;
guint64 expected_idsn= 0;
@@ -4348,8 +4375,11 @@ get_or_create_mptcpd_from_key(struct tcp_analysis* tcpd, tcp_flow_t *fwd, guint6
return mptcpd;
}
- /* MPTCP only standardizes SHA1 for now. */
- mptcp_cryptodata_sha1(key, &token, &expected_idsn);
+ /* MPTCP v0 only standardizes SHA1, and v1 SHA256. */
+ if (version == 0)
+ mptcp_cryptodata_sha1(key, &token, &expected_idsn);
+ else if (version == 1)
+ mptcp_cryptodata_sha256(key, &token, &expected_idsn);
mptcpd = mptcp_get_meta_from_token(tcpd, fwd, token);
@@ -4409,6 +4439,7 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
proto_item *item,*main_item;
proto_tree *mptcp_tree;
+ guint32 version;
guint8 subtype;
guint8 ipver;
int offset = 0;
@@ -4462,18 +4493,19 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
case TCPOPT_MPTCP_MP_CAPABLE:
mph->mh_mpc = TRUE;
- proto_tree_add_item(mptcp_tree, hf_tcp_option_mptcp_version, tvb,
- offset, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item_ret_uint(mptcp_tree, hf_tcp_option_mptcp_version, tvb,
+ offset, 1, ENC_BIG_ENDIAN, &version);
offset += 1;
item = proto_tree_add_bitmask(mptcp_tree, tvb, offset, hf_tcp_option_mptcp_flags,
- ett_tcp_option_mptcp, tcp_option_mptcp_capable_flags,
+ ett_tcp_option_mptcp,
+ version == 1 ? tcp_option_mptcp_capable_v1_flags : tcp_option_mptcp_capable_v0_flags,
ENC_BIG_ENDIAN);
mph->mh_capable_flags = tvb_get_guint8(tvb, offset);
if ((mph->mh_capable_flags & MPTCP_CAPABLE_CRYPTO_MASK) == 0) {
expert_add_info(pinfo, item, &ei_mptcp_analysis_missing_algorithm);
}
- if ((mph->mh_capable_flags & MPTCP_CAPABLE_CRYPTO_MASK) != MPTCP_HMAC_SHA1) {
+ if ((mph->mh_capable_flags & MPTCP_CAPABLE_CRYPTO_MASK) != MPTCP_HMAC_SHA) {
expert_add_info(pinfo, item, &ei_mptcp_analysis_unsupported_algorithm);
}
offset += 1;
@@ -4488,7 +4520,7 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
proto_tree_add_uint64(mptcp_tree, hf_tcp_option_mptcp_sender_key, tvb, offset, 8, mph->mh_key);
offset += 8;
- mptcpd = get_or_create_mptcpd_from_key(tcpd, tcpd->fwd, mph->mh_key, mph->mh_capable_flags & MPTCP_CAPABLE_CRYPTO_MASK);
+ mptcpd = get_or_create_mptcpd_from_key(tcpd, tcpd->fwd, version, mph->mh_key, mph->mh_capable_flags & MPTCP_CAPABLE_CRYPTO_MASK);
mptcpd->master = tcpd;
item = proto_tree_add_uint(mptcp_tree,
@@ -4514,7 +4546,7 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
}
}
else {
- mptcpd = get_or_create_mptcpd_from_key(tcpd, tcpd->rev, recv_key, mph->mh_capable_flags & MPTCP_CAPABLE_CRYPTO_MASK);
+ mptcpd = get_or_create_mptcpd_from_key(tcpd, tcpd->rev, version, recv_key, mph->mh_capable_flags & MPTCP_CAPABLE_CRYPTO_MASK);
}
}
@@ -7147,10 +7179,14 @@ proto_register_tcp(void)
{ "Extensibility", "tcp.options.mptcp.extensibility.flag", FT_UINT8,
BASE_DEC, NULL, 0x40, NULL, HFILL}},
- { &hf_tcp_option_mptcp_H_flag,
+ { &hf_tcp_option_mptcp_H_v0_flag,
{ "Use HMAC-SHA1", "tcp.options.mptcp.sha1.flag", FT_UINT8,
BASE_DEC, NULL, 0x01, NULL, HFILL}},
+ { &hf_tcp_option_mptcp_H_v1_flag,
+ { "Use HMAC-SHA256", "tcp.options.mptcp.sha256.flag", FT_UINT8,
+ BASE_DEC, NULL, 0x01, NULL, HFILL}},
+
{ &hf_tcp_option_mptcp_F_flag,
{ "DATA_FIN", "tcp.options.mptcp.datafin.flag", FT_UINT8,
BASE_DEC, NULL, MPTCP_DSS_FLAG_DATA_FIN_PRESENT, NULL, HFILL}},
diff --git a/epan/dissectors/packet-tcp.h b/epan/dissectors/packet-tcp.h
index dfee9cdeb4..38630d3a51 100644
--- a/epan/dissectors/packet-tcp.h
+++ b/epan/dissectors/packet-tcp.h
@@ -277,7 +277,8 @@ struct mptcp_subflow {
typedef enum {
MPTCP_HMAC_NOT_SET = 0,
- MPTCP_HMAC_SHA1 = 1,
+ /* this is either SHA1 for MPTCP v0 or sha256 for MPTCP v1 */
+ MPTCP_HMAC_SHA = 1,
MPTCP_HMAC_LAST
} mptcp_hmac_algorithm_t;
diff --git a/epan/dissectors/packet-tcp.c b/epan/dissectors/packet-tcp.c
index c4a9a6eb15..ca284604ed 100644
--- a/epan/dissectors/packet-tcp.c
+++ b/epan/dissectors/packet-tcp.c
@@ -271,6 +271,7 @@ static int hf_tcp_option_mptcp_subflow_seq_no = -1;
static int hf_tcp_option_mptcp_data_lvl_len = -1;
static int hf_tcp_option_mptcp_checksum = -1;
static int hf_tcp_option_mptcp_ipver = -1;
+static int hf_tcp_option_mptcp_echo = -1;
static int hf_tcp_option_mptcp_ipv4 = -1;
static int hf_tcp_option_mptcp_ipv6 = -1;
static int hf_tcp_option_mptcp_port = -1;
@@ -4776,33 +4777,32 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
break;
case TCPOPT_MPTCP_ADD_ADDR:
- proto_tree_add_item(mptcp_tree,
- hf_tcp_option_mptcp_ipver, tvb, offset, 1, ENC_BIG_ENDIAN);
ipver = tvb_get_guint8(tvb, offset) & 0x0F;
+ if (ipver == 4 || ipver == 6)
+ proto_tree_add_item(mptcp_tree,
+ hf_tcp_option_mptcp_ipver, tvb, offset, 1, ENC_BIG_ENDIAN);
+ else
+ proto_tree_add_item(mptcp_tree,
+ hf_tcp_option_mptcp_echo, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(mptcp_tree,
hf_tcp_option_mptcp_address_id, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
- switch (ipver) {
- case 4:
- proto_tree_add_item(mptcp_tree,
+ if (optlen == 8 || optlen == 10 || optlen == 16 || optlen == 18) {
+ proto_tree_add_item(mptcp_tree,
hf_tcp_option_mptcp_ipv4, tvb, offset, 4, ENC_BIG_ENDIAN);
- offset += 4;
- break;
+ offset += 4;
+ }
- case 6:
- proto_tree_add_item(mptcp_tree,
+ if (optlen == 20 || optlen == 22 || optlen == 28 || optlen == 30) {
+ proto_tree_add_item(mptcp_tree,
hf_tcp_option_mptcp_ipv6, tvb, offset, 16, ENC_NA);
- offset += 16;
- break;
-
- default:
- break;
+ offset += 16;
}
- if (optlen % 4 == 2) {
+ if (optlen == 10 || optlen == 18 || optlen == 22 || optlen == 30) {
proto_tree_add_item(mptcp_tree,
hf_tcp_option_mptcp_port, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
@@ -7303,6 +7303,10 @@ proto_register_tcp(void)
{ "IP version", "tcp.options.mptcp.ipver", FT_UINT8,
BASE_DEC, NULL, 0x0F, NULL, HFILL}},
+ { &hf_tcp_option_mptcp_echo,
+ { "Echo", "tcp.options.mptcp.echo", FT_UINT8,
+ BASE_DEC, NULL, 0x01, NULL, HFILL}},
+
{ &hf_tcp_option_mptcp_ipv4,
{ "Advertised IPv4 Address", "tcp.options.mptcp.ipv4", FT_IPv4,
BASE_NONE, NULL, 0x0, NULL, HFILL}},
diff --git a/epan/dissectors/packet-tcp.c b/epan/dissectors/packet-tcp.c
index 6bc1915e82..b0ed652215 100644
--- a/epan/dissectors/packet-tcp.c
+++ b/epan/dissectors/packet-tcp.c
@@ -2152,13 +2152,19 @@ tcp_analyze_sequence_number(packet_info *pinfo, guint32 seq, guint32 ack, guint3
&& seq==tcpd->fwd->tcp_analyze_seq_info->nextseq
&& ack==tcpd->fwd->tcp_analyze_seq_info->lastack
&& (flags&(TH_SYN|TH_FIN|TH_RST))==0 ) {
- tcpd->fwd->tcp_analyze_seq_info->dupacknum++;
- if(!tcpd->ta) {
- tcp_analyze_get_acked_struct(pinfo->num, seq, ack, TRUE, tcpd);
- }
- tcpd->ta->flags|=TCP_A_DUPLICATE_ACK;
- tcpd->ta->dupack_num=tcpd->fwd->tcp_analyze_seq_info->dupacknum;
- tcpd->ta->dupack_frame=tcpd->fwd->tcp_analyze_seq_info->lastnondupack;
+
+ /* MPTCP tolerates duplicate acks in some circumstances, see RFC 8684 4. */
+ if(tcpd->mptcp_analysis && (tcpd->mptcp_analysis->mp_operations!=tcpd->fwd->mp_operations)) {
+ /* just ignore this DUPLICATE ACK */
+ } else {
+ tcpd->fwd->tcp_analyze_seq_info->dupacknum++;
+ if(!tcpd->ta) {
+ tcp_analyze_get_acked_struct(pinfo->num, seq, ack, TRUE, tcpd);
+ }
+ tcpd->ta->flags|=TCP_A_DUPLICATE_ACK;
+ tcpd->ta->dupack_num=tcpd->fwd->tcp_analyze_seq_info->dupacknum;
+ tcpd->ta->dupack_frame=tcpd->fwd->tcp_analyze_seq_info->lastnondupack;
+ }
}
@@ -2343,6 +2349,10 @@ finished_checking_retransmission_type:
tcpd->fwd->tcp_analyze_seq_info->lastacktime.secs=pinfo->abs_ts.secs;
tcpd->fwd->tcp_analyze_seq_info->lastacktime.nsecs=pinfo->abs_ts.nsecs;
+ /* remember the MPTCP operations if any */
+ if( tcpd->mptcp_analysis ) {
+ tcpd->fwd->mp_operations=tcpd->mptcp_analysis->mp_operations;
+ }
/* if there were any flags set for this segment we need to remember them
* we only remember the flags for the very last segment though.
@@ -2702,24 +2712,17 @@ mptcp_analysis_add_subflows(packet_info *pinfo _U_, tvbuff_t *tvb,
proto_tree *parent_tree, struct mptcp_analysis* mptcpd)
{
wmem_list_frame_t *it;
- proto_tree *tree;
proto_item *item;
- item=proto_tree_add_item(parent_tree, hf_mptcp_analysis_subflows, tvb, 0, 0, ENC_NA);
- PROTO_ITEM_SET_GENERATED(item);
-
- tree=proto_item_add_subtree(item, ett_mptcp_analysis_subflows);
+ wmem_strbuf_t *val = wmem_strbuf_new(wmem_packet_scope(), "");
/* for the analysis, we set each subflow tcp stream id */
for(it = wmem_list_head(mptcpd->subflows); it != NULL; it = wmem_list_frame_next(it)) {
struct tcp_analysis *sf = (struct tcp_analysis *)wmem_list_frame_data(it);
- proto_item *subflow_item;
- subflow_item=proto_tree_add_uint(tree, hf_mptcp_analysis_subflows_stream_id, tvb, 0, 0, sf->stream);
- PROTO_ITEM_SET_HIDDEN(subflow_item);
-
- proto_item_append_text(item, " %d", sf->stream);
+ wmem_strbuf_append_printf(val, "%u ", sf->stream);
}
+ item = proto_tree_add_string(parent_tree, hf_mptcp_analysis_subflows, tvb, 0, 0, wmem_strbuf_get_str(val));
PROTO_ITEM_SET_GENERATED(item);
}
@@ -2962,6 +2965,42 @@ mptcp_add_analysis_subtree(packet_info *pinfo, tvbuff_t *tvb, proto_tree *parent
PROTO_ITEM_SET_GENERATED(item);
+ /* store the TCP Options related to MPTCP then we will avoid false DUP ACKs later */
+ guint8 nbOptionsChanged = 0;
+ if((tcpd->mptcp_analysis->mp_operations&(0x01))!=tcph->th_mptcp->mh_mpc) {
+ tcpd->mptcp_analysis->mp_operations |= 0x01;
+ nbOptionsChanged++;
+ }
+ if((tcpd->mptcp_analysis->mp_operations&(0x02))!=tcph->th_mptcp->mh_join) {
+ tcpd->mptcp_analysis->mp_operations |= 0x02;
+ nbOptionsChanged++;
+ }
+ if((tcpd->mptcp_analysis->mp_operations&(0x04))!=tcph->th_mptcp->mh_dss) {
+ tcpd->mptcp_analysis->mp_operations |= 0x04;
+ nbOptionsChanged++;
+ }
+ if((tcpd->mptcp_analysis->mp_operations&(0x08))!=tcph->th_mptcp->mh_add) {
+ tcpd->mptcp_analysis->mp_operations |= 0x08;
+ nbOptionsChanged++;
+ }
+ if((tcpd->mptcp_analysis->mp_operations&(0x10))!=tcph->th_mptcp->mh_remove) {
+ tcpd->mptcp_analysis->mp_operations |= 0x10;
+ nbOptionsChanged++;
+ }
+ if((tcpd->mptcp_analysis->mp_operations&(0x20))!=tcph->th_mptcp->mh_prio) {
+ tcpd->mptcp_analysis->mp_operations |= 0x20;
+ nbOptionsChanged++;
+ }
+ if((tcpd->mptcp_analysis->mp_operations&(0x40))!=tcph->th_mptcp->mh_fail) {
+ tcpd->mptcp_analysis->mp_operations |= 0x40;
+ nbOptionsChanged++;
+ }
+ if((tcpd->mptcp_analysis->mp_operations&(0x80))!=tcph->th_mptcp->mh_fastclose) {
+ tcpd->mptcp_analysis->mp_operations |= 0x80;
+ nbOptionsChanged++;
+ }
+ /* we could track MPTCP option changes here, with nbOptionsChanged */
+
item = proto_tree_add_uint(tree, hf_mptcp_stream, tvb, 0, 0, mptcpd->stream);
PROTO_ITEM_SET_GENERATED(item);
@@ -4537,6 +4576,7 @@ get_or_create_mptcpd_from_key(struct tcp_analysis* tcpd, tcp_flow_t *fwd, guint8
DISSECTOR_ASSERT(fwd->mptcp_subflow->meta);
+ fwd->mptcp_subflow->meta->version = version;
fwd->mptcp_subflow->meta->key = key;
fwd->mptcp_subflow->meta->static_flags |= MPTCP_META_HAS_KEY;
fwd->mptcp_subflow->meta->base_dsn = expected_idsn;
@@ -4747,6 +4787,13 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
offset += 4;
mptcpd = mptcp_get_meta_from_token(tcpd, tcpd->rev, mph->mh_token);
+ if (tcpd->fwd->mptcp_subflow->meta->version == 1) {
+ mptcp_meta_flow_t *tmp = tcpd->fwd->mptcp_subflow->meta;
+
+ /* if the negotiated version is v1 the first key was exchanged on SYN/ACK packet: we must swap the meta */
+ tcpd->fwd->mptcp_subflow->meta = tcpd->rev->mptcp_subflow->meta;
+ tcpd->rev->mptcp_subflow->meta = tmp;
+ }
proto_tree_add_item_ret_uint(mptcp_tree, hf_tcp_option_mptcp_sender_rand, tvb, offset,
4, ENC_BIG_ENDIAN, &tcpd->fwd->mptcp_subflow->nonce);
@@ -4897,6 +4944,7 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
break;
case TCPOPT_MPTCP_ADD_ADDR:
+ mph->mh_add = TRUE;
ipver = tvb_get_guint8(tvb, offset) & 0x0F;
if (ipver == 4 || ipver == 6)
proto_tree_add_item(mptcp_tree,
@@ -4935,6 +4983,7 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
break;
case TCPOPT_MPTCP_REMOVE_ADDR:
+ mph->mh_remove = TRUE;
item = proto_tree_add_uint(mptcp_tree, hf_mptcp_number_of_removed_addresses, tvb, start_offset+2,
1, optlen - 3);
PROTO_ITEM_SET_GENERATED(item);
@@ -4947,6 +4996,7 @@ dissect_tcpopt_mptcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
break;
case TCPOPT_MPTCP_MP_PRIO:
+ mph->mh_prio = TRUE;
proto_tree_add_bitmask(mptcp_tree, tvb, offset, hf_tcp_option_mptcp_flags,
ett_tcp_option_mptcp, tcp_option_mptcp_join_flags,
ENC_BIG_ENDIAN);
@@ -8040,7 +8090,7 @@ proto_register_tcp(void)
"This was retransmitted on another subflow", HFILL }},
{ &hf_mptcp_analysis_subflows,
- { "TCP subflow stream id(s):", "mptcp.analysis.subflows", FT_NONE, BASE_NONE, NULL, 0x0,
+ { "TCP subflow stream id(s)", "mptcp.analysis.subflows", FT_STRING, BASE_NONE, NULL, 0x0,
"List all TCP connections mapped to this MPTCP connection", HFILL }},
{ &hf_mptcp_stream,
diff --git a/epan/dissectors/packet-tcp.h b/epan/dissectors/packet-tcp.h
index ac250d948e..21e6a61086 100644
--- a/epan/dissectors/packet-tcp.h
+++ b/epan/dissectors/packet-tcp.h
@@ -49,8 +49,11 @@ struct mptcpheader {
gboolean mh_mpc; /* true if seen an mp_capable option */
gboolean mh_join; /* true if seen an mp_join option */
gboolean mh_dss; /* true if seen a dss */
- gboolean mh_fastclose; /* true if seen a fastclose */
+ gboolean mh_add; /* true if seen an MP_ADD */
+ gboolean mh_remove; /* true if seen an MP_REMOVE */
+ gboolean mh_prio; /* true if seen an MP_PRIO */
gboolean mh_fail; /* true if seen an MP_FAIL */
+ gboolean mh_fastclose; /* true if seen a fastclose */
guint8 mh_capable_flags; /* to get hmac version for instance */
guint8 mh_dss_flags; /* data sequence signal flag */
@@ -332,6 +335,7 @@ typedef struct _tcp_flow_t {
gboolean valid_bif; /* if lost pkts, disable BiF until ACK is recvd */
guint32 push_bytes_sent; /* bytes since the last PSH flag */
gboolean push_set_last; /* tracking last time PSH flag was set */
+ guint8 mp_operations; /* tracking of the MPTCP operations */
tcp_analyze_seq_flow_info_t* tcp_analyze_seq_info;
@@ -378,6 +382,9 @@ struct mptcp_analysis {
/* identifier of the tcp stream that saw the initial 3WHS with MP_CAPABLE option */
struct tcp_analysis *master;
+
+ /* Keep track of the last TCP operations seen in order to avoid false DUP ACKs */
+ guint8 mp_operations;
};
struct tcp_analysis {
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