steamnetworkingsockets_messages.proto

Protobufs / steamnetworkingsockets_messages.proto

CS2 build 25218825 · Steam date 2026-09-09 · platform windows-x86_64 · schema format 2.2

Group: GC and Steam SDKMessages: 10 top-level, 16 totalEnums: 1 top-level, 2 total

Imports: steamnetworkingsockets_messages_certs.proto

Enums

ESteamNetworkingSocketsCipher

Steam Networking Sockets Cipher SteamNetworking NetworkingSockets SocketsCipher k_ESteamNetworkingSocketsCipher_INVALID k_ESteamNetworkingSocketsCipher_NULL k_ESteamNetworkingSocketsCipher_AES_256_GCM

Name	Number	Message
k_ESteamNetworkingSocketsCipher_INVALID	0
k_ESteamNetworkingSocketsCipher_NULL	1
k_ESteamNetworkingSocketsCipher_AES_256_GCM	2

Messages

CMsgSteamDatagramSessionCryptInfo

Msg Steam Datagram Session Crypt Info MsgSteam SteamDatagram DatagramSession SessionCrypt CryptInfo key_type key_data nonce protocol_version ciphers

Field	Number	Label	Type	Default	Description
key_type	1	optional	CMsgSteamDatagramSessionCryptInfo.EKeyType
key_data	2	optional	bytes
nonce	3	optional	fixed64
protocol_version	4	optional	uint32
ciphers	5	repeated	ESteamNetworkingSocketsCipher

CMsgSteamDatagramSessionCryptInfo.EKeyType

Key Type KeyType INVALID CURVE25519

Name	Number	Message
INVALID	0
CURVE25519	1

CMsgSteamDatagramSessionCryptInfoSigned

Msg Steam Datagram Session Crypt Info Signed MsgSteam SteamDatagram DatagramSession SessionCrypt CryptInfo InfoSigned info signature

Referenced by (6): CMsgSteamDatagramConnectOK, CMsgSteamDatagramConnectRequest, CMsgSteamNetworkingP2PRendezvous.ConnectOK, CMsgSteamNetworkingP2PRendezvous.ConnectRequest, CMsgSteamSockets_UDP_ConnectOK, CMsgSteamSockets_UDP_ConnectRequest

Field	Number	Label	Type	Default	Description
info	1	optional	bytes
signature	2	optional	bytes

CMsgSteamDatagramDiagnostic

Msg Steam Datagram Diagnostic MsgSteam SteamDatagram DatagramDiagnostic severity text

Field	Number	Label	Type	Default	Description
severity	1	optional	uint32
text	2	optional	string

CMsgSteamDatagramLinkInstantaneousStats

Msg Steam Datagram Link Instantaneous Stats MsgSteam SteamDatagram DatagramLink LinkInstantaneous InstantaneousStats out_packets_per_sec_x10 out_bytes_per_sec in_packets_per_sec_x10 in_bytes_per_sec ping_ms packets_dropped_pct packets_weird_sequence_pct peak_jitter_usec

Referenced by (1): CMsgSteamDatagramConnectionQuality

Field	Number	Label	Type	Default	Description
out_packets_per_sec_x10	1	optional	uint32
out_bytes_per_sec	2	optional	uint32
in_packets_per_sec_x10	3	optional	uint32
in_bytes_per_sec	4	optional	uint32
ping_ms	5	optional	uint32
packets_dropped_pct	6	optional	uint32
packets_weird_sequence_pct	7	optional	uint32
peak_jitter_usec	8	optional	uint32

CMsgSteamDatagramLinkLifetimeStats

Msg Steam Datagram Link Lifetime Stats MsgSteam SteamDatagram DatagramLink LinkLifetime LifetimeStats connected_seconds packets_sent kb_sent packets_recv kb_recv packets_recv_sequenced packets_recv_dropped packets_recv_out_of_order packets_recv_duplicate packets_recv_lurch multipath_packets_recv_sequenced multipath_packets_recv_later multipath_send_enabled packets_recv_out_of_order_corrected quality_histogram_100 quality_histogram_99 quality_histogram_97 quality_histogram_95 quality_histogram_90 quality_histogram_75 quality_histogram_50 quality_histogram_1 quality_histogram_dead quality_ntile_2nd quality_ntile_5th quality_ntile_25th quality_ntile_50th ping_histogram_25 ping_histogram_50 ping_histogram_75 ping_histogram_100 ping_histogram_125 ping_histogram_150 ping_histogram_200 ping_histogram_300 ping_histogram_max ping_ntile_5th ping_ntile_50th ping_ntile_75th ping_ntile_95th ping_ntile_98th jitter_histogram_negligible jitter_histogram_1 jitter_histogram_2 jitter_histogram_5 jitter_histogram_10 jitter_histogram_20

Referenced by (1): CMsgSteamDatagramConnectionQuality

Field	Number	Label	Type	Default	Description
connected_seconds	2	optional	uint32
packets_sent	3	optional	uint64
kb_sent	4	optional	uint64
packets_recv	5	optional	uint64
kb_recv	6	optional	uint64
packets_recv_sequenced	7	optional	uint64
packets_recv_dropped	8	optional	uint64
packets_recv_out_of_order	9	optional	uint64
packets_recv_duplicate	10	optional	uint64
packets_recv_lurch	11	optional	uint64
multipath_packets_recv_sequenced	12	repeated	uint64
multipath_packets_recv_later	13	repeated	uint64
multipath_send_enabled	14	optional	uint32
packets_recv_out_of_order_corrected	15	optional	uint64
quality_histogram_100	21	optional	uint32
quality_histogram_99	22	optional	uint32
quality_histogram_97	23	optional	uint32
quality_histogram_95	24	optional	uint32
quality_histogram_90	25	optional	uint32
quality_histogram_75	26	optional	uint32
quality_histogram_50	27	optional	uint32
quality_histogram_1	28	optional	uint32
quality_histogram_dead	29	optional	uint32
quality_ntile_2nd	30	optional	uint32
quality_ntile_5th	31	optional	uint32
quality_ntile_25th	32	optional	uint32
quality_ntile_50th	33	optional	uint32
ping_histogram_25	41	optional	uint32
ping_histogram_50	42	optional	uint32
ping_histogram_75	43	optional	uint32
ping_histogram_100	44	optional	uint32
ping_histogram_125	45	optional	uint32
ping_histogram_150	46	optional	uint32
ping_histogram_200	47	optional	uint32
ping_histogram_300	48	optional	uint32
ping_histogram_max	49	optional	uint32
ping_ntile_5th	50	optional	uint32
ping_ntile_50th	51	optional	uint32
ping_ntile_75th	52	optional	uint32
ping_ntile_95th	53	optional	uint32
ping_ntile_98th	54	optional	uint32
jitter_histogram_negligible	61	optional	uint32
jitter_histogram_1	62	optional	uint32
jitter_histogram_2	63	optional	uint32
jitter_histogram_5	64	optional	uint32
jitter_histogram_10	65	optional	uint32
jitter_histogram_20	66	optional	uint32

CMsgSteamDatagramConnectionQuality

Msg Steam Datagram Connection Quality MsgSteam SteamDatagram DatagramConnection ConnectionQuality instantaneous lifetime

Referenced by (10): CGameNetworkingUI_ConnectionState, CMsgSteamDatagramConnectionClosed, CMsgSteamDatagramConnectionStatsClientToRouter, CMsgSteamDatagramConnectionStatsP2PClientToRouter, CMsgSteamDatagramConnectionStatsP2PRouterToClient, CMsgSteamDatagramConnectionStatsRouterToClient, CMsgSteamDatagramConnectionStatsRouterToServer, CMsgSteamDatagramConnectionStatsServerToRouter, CMsgSteamDatagramNoConnection, CMsgSteamSockets_UDP_Stats

Field	Number	Label	Type	Default	Description
instantaneous	1	optional	CMsgSteamDatagramLinkInstantaneousStats
lifetime	2	optional	CMsgSteamDatagramLinkLifetimeStats

CMsgICECandidate

Msg ICE Candidate MsgICE ICECandidate candidate

Referenced by (1): CMsgICERendezvous

Field	Number	Label	Type	Default	Description
candidate	3	optional	string

CMsgICERendezvous

Msg ICE Rendezvous MsgICE ICERendezvous add_candidate auth

Referenced by (1): CMsgSteamNetworkingP2PRendezvous.ReliableMessage

Field	Number	Label	Type	Default	Description
add_candidate	1	optional	CMsgICECandidate
auth	2	optional	CMsgICERendezvous.Auth

CMsgICERendezvous.Auth

pwd_frag

Referenced by (1): CMsgICERendezvous

Field	Number	Label	Type	Default	Description
pwd_frag	1	optional	string

CMsgSteamNetworkingP2PRendezvous

Msg Steam Networking P2 Rendezvous MsgSteam SteamNetworking NetworkingP2 P2Rendezvous to_connection_id sdr_routes ack_peer_routes_revision connect_request connect_ok connection_closed ice_enabled from_identity from_connection_id to_identity ack_reliable_msg first_reliable_msg reliable_messages hosted_server_ticket application_messages

Field	Number	Label	Type	Default	Description
to_connection_id	1	optional	fixed32
sdr_routes	2	optional	bytes
ack_peer_routes_revision	3	optional	uint32
connect_request	4	optional	CMsgSteamNetworkingP2PRendezvous.ConnectRequest
connect_ok	5	optional	CMsgSteamNetworkingP2PRendezvous.ConnectOK
connection_closed	6	optional	CMsgSteamNetworkingP2PRendezvous.ConnectionClosed
ice_enabled	7	optional	bool
from_identity	8	optional	string
from_connection_id	9	optional	fixed32
to_identity	10	optional	string
ack_reliable_msg	11	optional	uint32
first_reliable_msg	12	optional	uint32
reliable_messages	13	repeated	CMsgSteamNetworkingP2PRendezvous.ReliableMessage
hosted_server_ticket	14	optional	bytes
application_messages	15	repeated	CMsgSteamNetworkingP2PRendezvous.ApplicationMessage

CMsgSteamNetworkingP2PRendezvous.ConnectRequest

Connect Request crypt cert to_virtual_port from_virtual_port from_fakeip

Referenced by (1): CMsgSteamNetworkingP2PRendezvous

Field	Number	Label	Type	Default	Description
crypt	6	optional	CMsgSteamDatagramSessionCryptInfoSigned
cert	7	optional	CMsgSteamDatagramCertificateSigned
to_virtual_port	9	optional	uint32
from_virtual_port	10	optional	uint32
from_fakeip	11	optional	string

CMsgSteamNetworkingP2PRendezvous.ConnectOK

Connect OK crypt cert

Referenced by (1): CMsgSteamNetworkingP2PRendezvous

Field	Number	Label	Type	Default	Description
crypt	5	optional	CMsgSteamDatagramSessionCryptInfoSigned
cert	6	optional	CMsgSteamDatagramCertificateSigned

CMsgSteamNetworkingP2PRendezvous.ConnectionClosed

Connection Closed debug reason_code

Referenced by (1): CMsgSteamNetworkingP2PRendezvous

Field	Number	Label	Type	Default	Description
debug	5	optional	string
reason_code	6	optional	uint32

CMsgSteamNetworkingP2PRendezvous.ReliableMessage

Reliable Message ice

Referenced by (1): CMsgSteamNetworkingP2PRendezvous

Field	Number	Label	Type	Default	Description
ice	1	optional	CMsgICERendezvous

CMsgSteamNetworkingP2PRendezvous.ApplicationMessage

Application Message data msg_num flags lane_idx

Referenced by (1): CMsgSteamNetworkingP2PRendezvous

Field	Number	Label	Type	Default	Description
data	1	optional	bytes
msg_num	2	optional	uint64
flags	3	optional	uint32
lane_idx	4	optional	uint32

CMsgSteamNetworkingICESessionSummary

Msg Steam Networking ICE Session Summary MsgSteam SteamNetworking NetworkingICE ICESession SessionSummary local_candidate_types remote_candidate_types initial_route_kind initial_ping negotiation_ms initial_score failure_reason_code selected_seconds user_settings ice_enable_var local_candidate_types_allowed best_route_kind best_ping best_score best_time

Referenced by (1): CMsgSteamDatagramP2PRoutingSummary

Field	Number	Label	Type	Default	Description
local_candidate_types	1	optional	uint32
remote_candidate_types	2	optional	uint32
initial_route_kind	3	optional	uint32
initial_ping	4	optional	uint32
negotiation_ms	5	optional	uint32
initial_score	6	optional	uint32
failure_reason_code	7	optional	uint32
selected_seconds	12	optional	uint32
user_settings	13	optional	uint32
ice_enable_var	14	optional	uint32
local_candidate_types_allowed	15	optional	uint32
best_route_kind	16	optional	uint32
best_ping	17	optional	uint32
best_score	18	optional	uint32
best_time	19	optional	uint32

Reference graph

Message reference graph (14 edges)

flowchart LR
    n0["CMsgSteamDatagramConnectionQuality"]
    n1["CMsgSteamDatagramLinkInstantaneousStats"]
    n0 --> n1
    n2["CMsgSteamDatagramLinkLifetimeStats"]
    n0 --> n2
    n3["CMsgICERendezvous"]
    n4["CMsgICECandidate"]
    n3 --> n4
    n5["CMsgICERendezvous.Auth"]
    n3 --> n5
    n6["CMsgSteamNetworkingP2PRendezvous"]
    n7["CMsgSteamNetworkingP2PRendezvous.ConnectRequest"]
    n6 --> n7
    n8["CMsgSteamNetworkingP2PRendezvous.ConnectOK"]
    n6 --> n8
    n9["CMsgSteamNetworkingP2PRendezvous.ConnectionClosed"]
    n6 --> n9
    n10["CMsgSteamNetworkingP2PRendezvous.ReliableMessage"]
    n6 --> n10
    n11["CMsgSteamNetworkingP2PRendezvous.ApplicationMessage"]
    n6 --> n11
    n12["CMsgSteamDatagramSessionCryptInfoSigned"]
    n7 --> n12
    n13["CMsgSteamDatagramCertificateSigned"]
    n7 --> n13
    n8 --> n12
    n8 --> n13
    n10 --> n3