1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
|
/* SPDX-License-Identifier: Apache-2.0
* Copyright(c) 2025 Cisco Systems, Inc.
*/
#include <vppinfra/string.h>
#include <http/http2/frame.h>
#define MAX_U24 0xFFFFFF
static_always_inline u8 *
http2_decode_u24 (u8 *src, u32 *value)
{
*value = 0;
*value = (u32) (src[0] << 16) | (u32) (src[1] << 8) | (u32) src[2];
return src + 3;
}
static_always_inline u8 *
http2_encode_u24 (u8 *dst, u32 value)
{
ASSERT (value <= MAX_U24);
*dst++ = (value >> 16) & 0xFF;
*dst++ = (value >> 8) & 0xFF;
*dst++ = value & 0xFF;
return dst;
}
/*
* RFC9113 section 4.1
*
* HTTP Frame {
* Length (24),
* Type (8),
* Flags (8),
* Reserved (1),
* Stream Identifier (31),
* Frame Payload (..),
* }
*/
__clib_export void
http2_frame_header_read (u8 *src, http2_frame_header_t *fh)
{
u32 *stream_id;
src = http2_decode_u24 (src, &fh->length);
fh->type = *src++;
fh->flags = *src++;
stream_id = (u32 *) src;
fh->stream_id = clib_net_to_host_u32 (*stream_id) & 0x7FFFFFFF;
}
static void
http2_frame_header_write (http2_frame_header_t *fh, u8 *dst)
{
u32 stream_id;
dst = http2_encode_u24 (dst, fh->length);
*dst++ = fh->type;
*dst++ = fh->flags;
stream_id = clib_host_to_net_u32 (fh->stream_id);
clib_memcpy_fast (dst, &stream_id, sizeof (stream_id));
}
__clib_export http2_error_t
http2_frame_read_settings (http2_conn_settings_t *settings, u8 *payload,
u32 payload_len)
{
http2_settings_entry_t *entry;
u32 value;
while (payload_len >= sizeof (*entry))
{
entry = (http2_settings_entry_t *) payload;
switch (clib_net_to_host_u16 (entry->identifier))
{
#define _(v, label, member, min, max, default_value, err_code) \
case HTTP2_SETTINGS_##label: \
value = clib_net_to_host_u32 (entry->value); \
if (!(value >= min && value <= max)) \
return err_code; \
settings->member = value; \
break;
foreach_http2_settings
#undef _
/* ignore unknown or unsupported identifier */
default : break;
}
payload_len -= sizeof (*entry);
payload += sizeof (*entry);
}
if (payload_len != 0)
return HTTP2_ERROR_FRAME_SIZE_ERROR;
return HTTP2_ERROR_NO_ERROR;
}
__clib_export void
http2_frame_write_settings_ack (u8 **dst)
{
http2_frame_header_t fh = { .flags = HTTP2_FRAME_FLAG_ACK,
.type = HTTP2_FRAME_TYPE_SETTINGS };
u8 *p = http2_frame_header_alloc (dst);
http2_frame_header_write (&fh, p);
}
__clib_export void
http2_frame_write_settings (http2_settings_entry_t *settings, u8 **dst)
{
u8 *p;
u32 length;
http2_settings_entry_t *entry, e;
ASSERT (settings);
ASSERT (vec_len (settings) > 0);
length = vec_len (settings) * sizeof (*entry);
http2_frame_header_t fh = { .type = HTTP2_FRAME_TYPE_SETTINGS,
.length = length };
p = http2_frame_header_alloc (dst);
http2_frame_header_write (&fh, p);
vec_add2 (*dst, p, length);
vec_foreach (entry, settings)
{
e.identifier = clib_host_to_net_u16 (entry->identifier);
e.value = clib_host_to_net_u32 (entry->value);
clib_memcpy_fast (p, &e, sizeof (e));
p += sizeof (e);
}
}
#define WINDOW_UPDATE_LENGTH 4
__clib_export http2_error_t
http2_frame_read_window_update (u32 *increment, u8 *payload, u32 payload_len)
{
u32 *value;
if (payload_len != WINDOW_UPDATE_LENGTH)
return HTTP2_ERROR_FRAME_SIZE_ERROR;
value = (u32 *) payload;
if (value == 0)
return HTTP2_ERROR_PROTOCOL_ERROR;
*increment = clib_net_to_host_u32 (*value) & 0x7FFFFFFF;
return HTTP2_ERROR_NO_ERROR;
}
__clib_export void
http2_frame_write_window_update (u32 increment, u32 stream_id, u8 **dst)
{
u8 *p;
u32 value;
ASSERT (increment > 0 && increment <= 0x7FFFFFFF);
http2_frame_header_t fh = { .type = HTTP2_FRAME_TYPE_WINDOW_UPDATE,
.length = WINDOW_UPDATE_LENGTH,
.stream_id = stream_id };
p = http2_frame_header_alloc (dst);
http2_frame_header_write (&fh, p);
vec_add2 (*dst, p, WINDOW_UPDATE_LENGTH);
value = clib_host_to_net_u32 (increment);
clib_memcpy_fast (p, &value, WINDOW_UPDATE_LENGTH);
}
#define RST_STREAM_LENGTH 4
__clib_export http2_error_t
http2_frame_read_rst_stream (u32 *error_code, u8 *payload, u32 payload_len)
{
u32 *value;
if (payload_len != RST_STREAM_LENGTH)
return HTTP2_ERROR_FRAME_SIZE_ERROR;
value = (u32 *) payload;
*error_code = clib_net_to_host_u32 (*value);
return HTTP2_ERROR_NO_ERROR;
}
__clib_export void
http2_frame_write_rst_stream (http2_error_t error_code, u32 stream_id,
u8 **dst)
{
u8 *p;
u32 value;
ASSERT (stream_id > 0 && stream_id <= 0x7FFFFFFF);
http2_frame_header_t fh = { .type = HTTP2_FRAME_TYPE_RST_STREAM,
.length = RST_STREAM_LENGTH,
.stream_id = stream_id };
p = http2_frame_header_alloc (dst);
http2_frame_header_write (&fh, p);
vec_add2 (*dst, p, RST_STREAM_LENGTH);
value = clib_host_to_net_u32 ((u32) error_code);
clib_memcpy_fast (p, &value, RST_STREAM_LENGTH);
}
#define GOAWAY_MIN_SIZE 8
__clib_export http2_error_t
http2_frame_read_goaway (u32 *error_code, u32 *last_stream_id, u8 *payload,
u32 payload_len)
{
u32 *value;
if (payload_len < GOAWAY_MIN_SIZE)
return HTTP2_ERROR_FRAME_SIZE_ERROR;
value = (u32 *) payload;
*last_stream_id = clib_net_to_host_u32 (*value) & 0x7FFFFFFF;
payload += 4;
value = (u32 *) payload;
*error_code = clib_net_to_host_u32 (*value);
/* TODO: Additional Debug Data */
return HTTP2_ERROR_NO_ERROR;
}
__clib_export void
http2_frame_write_goaway (http2_error_t error_code, u32 last_stream_id,
u8 **dst)
{
u8 *p;
u32 value;
ASSERT (last_stream_id > 0 && last_stream_id <= 0x7FFFFFFF);
http2_frame_header_t fh = { .type = HTTP2_FRAME_TYPE_GOAWAY,
.length = GOAWAY_MIN_SIZE };
p = http2_frame_header_alloc (dst);
http2_frame_header_write (&fh, p);
vec_add2 (*dst, p, GOAWAY_MIN_SIZE);
value = clib_host_to_net_u32 (last_stream_id);
clib_memcpy_fast (p, &value, 4);
p += 4;
value = clib_host_to_net_u32 ((u32) error_code);
clib_memcpy_fast (p, &value, 4);
/* TODO: Additional Debug Data */
}
#define PRIORITY_DATA_LEN 5
__clib_export http2_error_t
http2_frame_read_headers (u8 **headers, u32 *headers_len, u8 *payload,
u32 payload_len, u8 flags)
{
*headers_len = payload_len;
if (flags & HTTP2_FRAME_FLAG_PADED)
{
u8 pad_len = *payload++;
if ((u32) pad_len >= payload_len)
return HTTP2_ERROR_PROTOCOL_ERROR;
*headers_len -= pad_len;
}
if (flags & HTTP2_FRAME_FLAG_PRIORITY)
{
if (*headers_len <= PRIORITY_DATA_LEN)
return HTTP2_ERROR_FRAME_SIZE_ERROR;
/* just skip, priority scheme defined in RFC7540 is deprecated */
*headers_len -= PRIORITY_DATA_LEN;
payload += PRIORITY_DATA_LEN;
}
*headers = payload;
return HTTP2_ERROR_NO_ERROR;
}
__clib_export void
http2_frame_write_headers_header (u32 headers_len, u32 stream_id, u8 flags,
u8 *dst)
{
ASSERT (stream_id > 0 && stream_id <= 0x7FFFFFFF);
http2_frame_header_t fh = { .type = HTTP2_FRAME_TYPE_HEADERS,
.length = headers_len,
.flags = flags,
.stream_id = stream_id };
http2_frame_header_write (&fh, dst);
}
__clib_export http2_error_t
http2_frame_read_data (u8 **data, u32 *data_len, u8 *payload, u32 payload_len,
u8 flags)
{
*data_len = payload_len;
if (flags & HTTP2_FRAME_FLAG_PADED)
{
u8 pad_len = *payload++;
if ((u32) pad_len >= payload_len)
return HTTP2_ERROR_PROTOCOL_ERROR;
*data_len -= pad_len;
}
*data = payload;
return HTTP2_ERROR_NO_ERROR;
}
__clib_export void
http2_frame_write_data_header (u32 data_len, u32 stream_id, u8 flags, u8 *dst)
{
ASSERT (stream_id > 0 && stream_id <= 0x7FFFFFFF);
http2_frame_header_t fh = { .type = HTTP2_FRAME_TYPE_DATA,
.length = data_len,
.flags = flags,
.stream_id = stream_id };
http2_frame_header_write (&fh, dst);
}
|
