Line data Source code
1 : /* 17.2. Long Header Packets
2 : Long Header Packet {
3 : Header Form (1) = 1,
4 : Fixed Bit (1) = 1,
5 : Long Packet Type (2),
6 : Type-Specific Bits (4),
7 : Version (32),
8 : Destination Connection ID Length (8),
9 : Destination Connection ID (0..160),
10 : Source Connection ID Length (8),
11 : Source Connection ID (0..160),
12 : Type-Specific Payload (..),
13 : }
14 : Figure 13: Long Header Packet Format */
15 :
16 : /* long header except first byte */
17 28242 : FD_TEMPL_DEF_STRUCT_BEGIN(long_hdr)
18 28227 : FD_TEMPL_MBR_ELEM ( version, uint )
19 28227 : FD_TEMPL_MBR_ELEM ( dst_conn_id_len, uchar )
20 56148 : FD_TEMPL_MBR_ELEM_VAR( dst_conn_id, 0,20, dst_conn_id_len )
21 56148 : FD_TEMPL_MBR_ELEM ( src_conn_id_len, uchar )
22 55794 : FD_TEMPL_MBR_ELEM_VAR( src_conn_id, 0,20, src_conn_id_len )
23 55794 : FD_TEMPL_DEF_STRUCT_END(long_hdr)
24 :
25 :
26 : /* 17.2.2 Version Negotiation Packet
27 : Version Negotiation Packet {
28 : Header Form (1) = 1,
29 : Unused (7),
30 : Version (32) = 0,
31 : Destination Connection ID Length (8),
32 : Destination Connection ID (0..2040),
33 : Source Connection ID Length (8),
34 : Source Connection ID (0..2040),
35 : Supported Version (32) ...,
36 : }
37 : Figure 14: Version Negotiation Packet */
38 :
39 15 : FD_TEMPL_DEF_STRUCT_BEGIN(version_neg)
40 0 : FD_TEMPL_MBR_ELEM ( h0, uchar )
41 0 : FD_TEMPL_MBR_ELEM ( version, uint )
42 0 : FD_TEMPL_MBR_ELEM ( dst_conn_id_len, uchar )
43 0 : FD_TEMPL_MBR_ELEM_VAR_RAW( dst_conn_id, 0,255, dst_conn_id_len )
44 0 : FD_TEMPL_MBR_ELEM ( src_conn_id_len, uchar )
45 0 : FD_TEMPL_MBR_ELEM_VAR_RAW( src_conn_id, 0,255, src_conn_id_len )
46 0 : FD_TEMPL_DEF_STRUCT_END(version_neg)
47 :
48 :
49 : /* 17.2.2 Initial Packet
50 : Initial Packet {
51 : Header Form (1) = 1,
52 : Fixed Bit (1) = 1,
53 : Long Packet Type (2) = 0,
54 : Reserved Bits (2),
55 : Packet Number Length (2),
56 : Version (32),
57 : Destination Connection ID Length (8),
58 : Destination Connection ID (0..160),
59 : Source Connection ID Length (8),
60 : Source Connection ID (0..160),
61 :
62 : Token Length (i),
63 : Token (..),
64 : Length (i),
65 : Packet Number (8..32),
66 : Packet Payload (8..),
67 : }
68 : Figure 15: Initial Packet
69 :
70 : The first CRYPTO frame sent always begins at an offset of 0 */
71 :
72 27639 : FD_TEMPL_DEF_STRUCT_BEGIN(initial)
73 27624 : FD_TEMPL_MBR_ELEM ( h0, uchar )
74 27624 : FD_TEMPL_MBR_ELEM ( version, uint )
75 27624 : FD_TEMPL_MBR_ELEM ( dst_conn_id_len, uchar )
76 55248 : FD_TEMPL_MBR_ELEM_VAR ( dst_conn_id, 0,20, dst_conn_id_len )
77 55248 : FD_TEMPL_MBR_ELEM ( src_conn_id_len, uchar )
78 55248 : FD_TEMPL_MBR_ELEM_VAR ( src_conn_id, 0,20, src_conn_id_len )
79 :
80 55248 : FD_TEMPL_MBR_ELEM_VARINT ( token_len, ulong )
81 68790 : FD_TEMPL_MBR_ELEM_VAR_RAW ( token, 0,256, token_len )
82 :
83 68790 : FD_TEMPL_MBR_ELEM_VARINT ( len, ulong )
84 40302 : FD_TEMPL_MBR_ELEM_PKTNUM ( pkt_num, ulong )
85 :
86 : // CRYPTO frames, etc, may start here
87 40302 : FD_TEMPL_DEF_STRUCT_END(initial)
88 :
89 :
90 : /* 17.2.4 Handshake Packet
91 : Handshake Packet {
92 : Header Form (1) = 1,
93 : Fixed Bit (1) = 1,
94 : Long Packet Type (2) = 2,
95 : Reserved Bits (2),
96 : Packet Number Length (2),
97 : Version (32),
98 : Destination Connection ID Length (8),
99 : Destination Connection ID (0..160),
100 : Source Connection ID Length (8),
101 : Source Connection ID (0..160),
102 : Length (i),
103 : Packet Number (8..32),
104 : Packet Payload (8..),
105 : }
106 : Figure 17: Handshake Protected Packet */
107 :
108 24075 : FD_TEMPL_DEF_STRUCT_BEGIN(handshake)
109 24060 : FD_TEMPL_MBR_ELEM ( h0, uchar )
110 24060 : FD_TEMPL_MBR_ELEM ( version, uint )
111 24060 : FD_TEMPL_MBR_ELEM ( dst_conn_id_len, uchar )
112 48120 : FD_TEMPL_MBR_ELEM_VAR ( dst_conn_id, 0,20, dst_conn_id_len )
113 48120 : FD_TEMPL_MBR_ELEM ( src_conn_id_len, uchar )
114 48120 : FD_TEMPL_MBR_ELEM_VAR ( src_conn_id, 0,20, src_conn_id_len )
115 :
116 48120 : FD_TEMPL_MBR_ELEM_VARINT ( len, ulong )
117 36090 : FD_TEMPL_MBR_ELEM_PKTNUM ( pkt_num, ulong )
118 :
119 : // payload starts here
120 36090 : FD_TEMPL_DEF_STRUCT_END(handshake)
121 :
122 :
123 : /* 17.2.5 Retry Packet
124 : Retry Packet {
125 : Header Form (1) = 1,
126 : Fixed Bit (1) = 1,
127 : Long Packet Type (2) = 3,
128 : Unused (4),
129 : Version (32),
130 : Destination Connection ID Length (8),
131 : Destination Connection ID (0..160),
132 : Source Connection ID Length (8),
133 : Source Connection ID (0..160),
134 : Retry Token (..),
135 : Retry Integrity Tag (128),
136 : }
137 : Figure 18: Retry Packet */
138 6002889 : FD_TEMPL_DEF_STRUCT_BEGIN(retry_hdr)
139 6002874 : FD_TEMPL_MBR_ELEM ( h0, uchar )
140 6002874 : FD_TEMPL_MBR_ELEM ( version, uint )
141 6002874 : FD_TEMPL_MBR_ELEM ( dst_conn_id_len, uchar )
142 12005724 : FD_TEMPL_MBR_ELEM_VAR( dst_conn_id, 0,20, dst_conn_id_len )
143 12005724 : FD_TEMPL_MBR_ELEM ( src_conn_id_len, uchar )
144 12005700 : FD_TEMPL_MBR_ELEM_VAR( src_conn_id, 0,20, src_conn_id_len )
145 12005700 : FD_TEMPL_DEF_STRUCT_END(retry_hdr)
146 :
147 :
148 :
149 : /* 17.2. Short Header Packets
150 : 1-RTT Packet {
151 : Header Form (1) = 0,
152 : Fixed Bit (1) = 1,
153 : Spin Bit (1),
154 : Reserved Bits (2),
155 : Key Phase (1),
156 : Packet Number Length (2),
157 : Destination Connection ID (0..160),
158 : Packet Number (8..32),
159 : Packet Payload (8..),
160 : }
161 : Figure 19: 1-RTT Packet */
162 13827832 : FD_TEMPL_DEF_STRUCT_BEGIN(one_rtt)
163 13827817 : FD_TEMPL_MBR_ELEM ( h0, uchar )
164 13827817 : FD_TEMPL_MBR_ELEM_HIDDEN( dst_conn_id_len, uint )
165 27655634 : FD_TEMPL_MBR_ELEM_VAR ( dst_conn_id, 0,20, dst_conn_id_len )
166 :
167 27655634 : FD_TEMPL_MBR_ELEM_PKTNUM( pkt_num, ulong )
168 :
169 : // payload starts here
170 13827817 : FD_TEMPL_DEF_STRUCT_END(one_rtt)
171 :
172 :
173 :
174 : /* 18. Transport Parameter Encoding
175 : Transport Parameters {
176 : Transport Parameter (..) ...,
177 : }
178 : Figure 20: Sequence of Transport Parameters
179 : Each transport parameter is encoded as an (identifier, length, value) tuple, as shown in Figure 21:
180 :
181 : Transport Parameter {
182 : Transport Parameter ID (i),
183 : Transport Parameter Length (i),
184 : Transport Parameter Value (..),
185 : }
186 : Figure 21: Transport Parameter Encoding */
187 :
188 : // one transport entry - repeats
189 15 : FD_TEMPL_DEF_STRUCT_BEGIN(transport_param_entry)
190 0 : FD_TEMPL_MBR_ELEM_VARINT ( param_id, ulong )
191 0 : FD_TEMPL_MBR_ELEM_VARINT ( param_len, ulong )
192 0 : FD_TEMPL_MBR_ELEM_VAR_RAW( param_val, 0,1024, param_len )
193 0 : FD_TEMPL_DEF_STRUCT_END(transport_param_entry)
194 :
195 :
196 : /* 19. Frame common header
197 :
198 : COMMON Frag {
199 : Type (i)
200 : } */
201 21 : FD_TEMPL_DEF_STRUCT_BEGIN(common_frag)
202 6 : FD_TEMPL_MBR_ELEM_VARINT( type, ulong )
203 6 : FD_TEMPL_DEF_STRUCT_END(common_frag)
204 :
205 :
206 : /* 19.3.1. ACK Ranges (part of ACK frame)
207 :
208 : ACK Range {
209 : Gap (i),
210 : ACK Range Length (i),
211 : }
212 : Figure 26: ACK Ranges */
213 :
214 63 : FD_TEMPL_DEF_STRUCT_BEGIN(ack_range_frag)
215 48 : FD_TEMPL_MBR_ELEM_VARINT( gap, ulong )
216 42 : FD_TEMPL_MBR_ELEM_VARINT( length, ulong )
217 42 : FD_TEMPL_DEF_STRUCT_END(ack_range_frag)
218 :
219 :
220 : /* 19.3.2. ECN Counts (part of ACK frame)
221 :
222 : ECN Counts {
223 : ECT0 Count (i),
224 : ECT1 Count (i),
225 : ECN-CE Count (i),
226 : }
227 : Figure 27: ECN Count Format
228 : The ECN count fields are:
229 :
230 : ECT0 Count:
231 : A variable-length integer representing the total number of packets received with the
232 : ECT(0) codepoint in the packet number space of the ACK frame.
233 :
234 : ECT1 Count:
235 : A variable-length integer representing the total number of packets received with the
236 : ECT(1) codepoint in the packet number space of the ACK frame.
237 :
238 : ECN-CE Count:
239 : A variable-length integer representing the total number of packets received with the
240 : ECN-CE codepoint in the packet number space of the ACK frame. */
241 :
242 15 : FD_TEMPL_DEF_STRUCT_BEGIN(ecn_counts_frag)
243 0 : FD_TEMPL_MBR_ELEM_VARINT( ect0_count, ulong )
244 0 : FD_TEMPL_MBR_ELEM_VARINT( ect1_count, ulong )
245 0 : FD_TEMPL_MBR_ELEM_VARINT( ecn_ce_count, ulong )
246 0 : FD_TEMPL_DEF_STRUCT_END(ecn_counts_frag)
247 :
248 :
249 : /* 18.2. Transport Parameter Definitions > Preferred Address */
250 :
251 27 : FD_TEMPL_DEF_STRUCT_BEGIN(preferred_address)
252 12 : FD_TEMPL_MBR_ELEM_RAW ( ipv4_address, 4 )
253 12 : FD_TEMPL_MBR_ELEM ( ipv4_port, ushort )
254 12 : FD_TEMPL_MBR_ELEM_RAW ( ipv6_address, 16 )
255 12 : FD_TEMPL_MBR_ELEM ( ipv6_port, ushort )
256 12 : FD_TEMPL_MBR_ELEM ( conn_id_len, uchar )
257 24 : FD_TEMPL_MBR_ELEM_VAR ( conn_id, 0,20, conn_id_len )
258 24 : FD_TEMPL_MBR_ELEM_RAW ( reset_token, 16 )
259 12 : FD_TEMPL_DEF_STRUCT_END(preferred_address)
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