Mercurial > hg > nginx-quic
comparison src/event/quic/ngx_event_quic_socket.c @ 8423:4117aa7fa38e quic
QUIC: connection migration.
The patch adds proper transitions between multiple networking addresses that
can be used by a single quic connection. New networking paths are validated
using PATH_CHALLENGE/PATH_RESPONSE frames.
author | Vladimir Homutov <vl@nginx.com> |
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date | Thu, 29 Apr 2021 15:35:02 +0300 |
parents | |
children | 6d1488b62dc5 |
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8422:12f18e0bca09 | 8423:4117aa7fa38e |
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1 | |
2 /* | |
3 * Copyright (C) Nginx, Inc. | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_event.h> | |
10 #include <ngx_event_quic_connection.h> | |
11 | |
12 | |
13 static ngx_int_t ngx_quic_create_temp_socket(ngx_connection_t *c, | |
14 ngx_quic_connection_t *qc, ngx_str_t *dcid, ngx_quic_path_t *path, | |
15 ngx_quic_client_id_t *cid); | |
16 | |
17 static void ngx_quic_unref_path(ngx_connection_t *c, ngx_quic_path_t *path); | |
18 | |
19 | |
20 ngx_int_t | |
21 ngx_quic_open_sockets(ngx_connection_t *c, ngx_quic_connection_t *qc, | |
22 ngx_quic_header_t *pkt) | |
23 { | |
24 ngx_quic_path_t *path; | |
25 ngx_quic_socket_t *qsock; | |
26 ngx_quic_client_id_t *cid; | |
27 | |
28 /* | |
29 * qc->nclient_ids = 0 | |
30 * qc->nsockets = 0 | |
31 * qc->max_retired_seqnum = 0 | |
32 * qc->client_seqnum = 0 | |
33 */ | |
34 | |
35 ngx_queue_init(&qc->sockets); | |
36 ngx_queue_init(&qc->free_sockets); | |
37 | |
38 ngx_queue_init(&qc->paths); | |
39 ngx_queue_init(&qc->free_paths); | |
40 | |
41 ngx_queue_init(&qc->client_ids); | |
42 ngx_queue_init(&qc->free_client_ids); | |
43 | |
44 qc->tp.original_dcid.len = pkt->odcid.len; | |
45 qc->tp.original_dcid.data = ngx_pstrdup(c->pool, &pkt->odcid); | |
46 if (qc->tp.original_dcid.data == NULL) { | |
47 return NGX_ERROR; | |
48 } | |
49 | |
50 /* socket to use for further processing */ | |
51 qsock = ngx_quic_alloc_socket(c, qc); | |
52 if (qsock == NULL) { | |
53 return NGX_ERROR; | |
54 } | |
55 | |
56 /* socket is listening at new server id (autogenerated) */ | |
57 if (ngx_quic_listen(c, qc, qsock) != NGX_OK) { | |
58 return NGX_ERROR; | |
59 } | |
60 | |
61 qc->tp.initial_scid.len = qsock->sid.len; | |
62 qc->tp.initial_scid.data = ngx_pnalloc(c->pool, qsock->sid.len); | |
63 if (qc->tp.initial_scid.data == NULL) { | |
64 goto failed; | |
65 } | |
66 ngx_memcpy(qc->tp.initial_scid.data, qsock->sid.id, qsock->sid.len); | |
67 | |
68 /* for all packets except first, this is set at udp layer */ | |
69 c->udp = &qsock->udp; | |
70 | |
71 /* ngx_quic_get_connection(c) macro is now usable */ | |
72 | |
73 /* we have a client identified by scid */ | |
74 cid = ngx_quic_create_client_id(c, &pkt->scid, 0, NULL); | |
75 if (cid == NULL) { | |
76 goto failed; | |
77 } | |
78 | |
79 /* the client arrived from this path */ | |
80 path = ngx_quic_add_path(c, c->sockaddr, c->socklen); | |
81 if (path == NULL) { | |
82 goto failed; | |
83 } | |
84 | |
85 if (pkt->validated) { | |
86 path->state = NGX_QUIC_PATH_VALIDATED; | |
87 path->validated_at = ngx_time(); | |
88 } | |
89 | |
90 /* now bind socket to client and path */ | |
91 ngx_quic_connect(c, qsock, path, cid); | |
92 | |
93 if (ngx_quic_create_temp_socket(c, qc, &pkt->odcid, path, cid) != NGX_OK) { | |
94 goto failed; | |
95 } | |
96 | |
97 /* use this socket as default destination */ | |
98 qc->socket = qsock; | |
99 | |
100 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
101 "quic active socket is #%uL:%uL:%uL (%s)", | |
102 qsock->sid.seqnum, qsock->cid->seqnum, qsock->path->seqnum, | |
103 ngx_quic_path_state_str(qsock->path)); | |
104 | |
105 return NGX_OK; | |
106 | |
107 failed: | |
108 | |
109 ngx_rbtree_delete(&c->listening->rbtree, &qsock->udp.node); | |
110 c->udp = NULL; | |
111 | |
112 return NGX_ERROR; | |
113 } | |
114 | |
115 | |
116 static ngx_int_t | |
117 ngx_quic_create_temp_socket(ngx_connection_t *c, ngx_quic_connection_t *qc, | |
118 ngx_str_t *dcid, ngx_quic_path_t *path, ngx_quic_client_id_t *cid) | |
119 { | |
120 ngx_str_t id; | |
121 ngx_quic_socket_t *qsock; | |
122 ngx_quic_server_id_t *sid; | |
123 | |
124 qsock = ngx_quic_alloc_socket(c, qc); | |
125 if (qsock == NULL) { | |
126 return NGX_ERROR; | |
127 } | |
128 | |
129 sid = &qsock->sid; | |
130 | |
131 sid->seqnum = NGX_QUIC_UNSET_PN; /* mark socket as temporary */ | |
132 | |
133 sid->len = dcid->len; | |
134 ngx_memcpy(sid->id, dcid->data, dcid->len); | |
135 | |
136 id.len = sid->len; | |
137 id.data = sid->id; | |
138 | |
139 ngx_insert_udp_connection(c, &qsock->udp, &id); | |
140 | |
141 ngx_queue_insert_tail(&qc->sockets, &qsock->queue); | |
142 | |
143 qc->nsockets++; | |
144 qsock->quic = qc; | |
145 | |
146 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
147 "quic socket #%L listening at sid:%xV nsock:%ui", | |
148 (int64_t) sid->seqnum, &id, qc->nsockets); | |
149 | |
150 ngx_quic_connect(c, qsock, path, cid); | |
151 | |
152 return NGX_OK; | |
153 } | |
154 | |
155 | |
156 ngx_quic_socket_t * | |
157 ngx_quic_alloc_socket(ngx_connection_t *c, ngx_quic_connection_t *qc) | |
158 { | |
159 ngx_queue_t *q; | |
160 ngx_quic_socket_t *sock; | |
161 | |
162 if (!ngx_queue_empty(&qc->free_sockets)) { | |
163 | |
164 q = ngx_queue_head(&qc->free_sockets); | |
165 sock = ngx_queue_data(q, ngx_quic_socket_t, queue); | |
166 | |
167 ngx_queue_remove(&sock->queue); | |
168 | |
169 ngx_memzero(sock, sizeof(ngx_quic_socket_t)); | |
170 | |
171 } else { | |
172 | |
173 sock = ngx_pcalloc(c->pool, sizeof(ngx_quic_socket_t)); | |
174 if (sock == NULL) { | |
175 return NULL; | |
176 } | |
177 } | |
178 | |
179 return sock; | |
180 } | |
181 | |
182 | |
183 void | |
184 ngx_quic_close_socket(ngx_connection_t *c, ngx_quic_socket_t *qsock) | |
185 { | |
186 ngx_quic_connection_t *qc; | |
187 | |
188 qc = ngx_quic_get_connection(c); | |
189 | |
190 ngx_queue_remove(&qsock->queue); | |
191 ngx_queue_insert_head(&qc->free_sockets, &qsock->queue); | |
192 | |
193 ngx_rbtree_delete(&c->listening->rbtree, &qsock->udp.node); | |
194 qc->nsockets--; | |
195 | |
196 if (qsock->path) { | |
197 ngx_quic_unref_path(c, qsock->path); | |
198 } | |
199 | |
200 if (qsock->cid) { | |
201 ngx_quic_unref_client_id(c, qsock->cid); | |
202 } | |
203 | |
204 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
205 "quic socket #%L closed nsock:%ui", | |
206 (int64_t) qsock->sid.seqnum, qc->nsockets); | |
207 } | |
208 | |
209 | |
210 static void | |
211 ngx_quic_unref_path(ngx_connection_t *c, ngx_quic_path_t *path) | |
212 { | |
213 ngx_quic_connection_t *qc; | |
214 | |
215 path->refcnt--; | |
216 | |
217 if (path->refcnt) { | |
218 return; | |
219 } | |
220 | |
221 qc = ngx_quic_get_connection(c); | |
222 | |
223 ngx_queue_remove(&path->queue); | |
224 ngx_queue_insert_head(&qc->free_paths, &path->queue); | |
225 | |
226 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
227 "quic path #%uL addr:%V removed", | |
228 path->seqnum, &path->addr_text); | |
229 } | |
230 | |
231 | |
232 ngx_int_t | |
233 ngx_quic_listen(ngx_connection_t *c, ngx_quic_connection_t *qc, | |
234 ngx_quic_socket_t *qsock) | |
235 { | |
236 ngx_str_t id; | |
237 ngx_quic_server_id_t *sid; | |
238 | |
239 sid = &qsock->sid; | |
240 | |
241 sid->len = NGX_QUIC_SERVER_CID_LEN; | |
242 | |
243 if (ngx_quic_create_server_id(c, sid->id) != NGX_OK) { | |
244 return NGX_ERROR; | |
245 } | |
246 | |
247 sid->seqnum = qc->server_seqnum++; | |
248 | |
249 id.data = sid->id; | |
250 id.len = sid->len; | |
251 | |
252 ngx_insert_udp_connection(c, &qsock->udp, &id); | |
253 | |
254 ngx_queue_insert_tail(&qc->sockets, &qsock->queue); | |
255 | |
256 qc->nsockets++; | |
257 qsock->quic = qc; | |
258 | |
259 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
260 "quic socket #%uL listening at sid:%xV nsock:%ui", | |
261 sid->seqnum, &id, qc->nsockets); | |
262 | |
263 return NGX_OK; | |
264 } | |
265 | |
266 | |
267 void | |
268 ngx_quic_connect(ngx_connection_t *c, ngx_quic_socket_t *sock, | |
269 ngx_quic_path_t *path, ngx_quic_client_id_t *cid) | |
270 { | |
271 sock->path = path; | |
272 path->refcnt++; | |
273 | |
274 sock->cid = cid; | |
275 cid->refcnt++; | |
276 | |
277 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
278 "quic socket #%L connected to cid #%uL path:%uL", | |
279 (int64_t) sock->sid.seqnum, | |
280 sock->cid->seqnum, path->seqnum); | |
281 } | |
282 | |
283 | |
284 void | |
285 ngx_quic_close_sockets(ngx_connection_t *c) | |
286 { | |
287 ngx_queue_t *q; | |
288 ngx_quic_socket_t *qsock; | |
289 ngx_quic_connection_t *qc; | |
290 | |
291 qc = ngx_quic_get_connection(c); | |
292 | |
293 ngx_quic_close_socket(c, qc->socket); | |
294 | |
295 if (qc->backup) { | |
296 ngx_quic_close_socket(c, qc->backup); | |
297 } | |
298 | |
299 while (!ngx_queue_empty(&qc->sockets)) { | |
300 q = ngx_queue_head(&qc->sockets); | |
301 qsock = ngx_queue_data(q, ngx_quic_socket_t, queue); | |
302 | |
303 ngx_quic_close_socket(c, qsock); | |
304 } | |
305 } | |
306 | |
307 | |
308 ngx_quic_socket_t * | |
309 ngx_quic_find_socket(ngx_connection_t *c, uint64_t seqnum) | |
310 { | |
311 ngx_queue_t *q; | |
312 ngx_quic_socket_t *qsock; | |
313 ngx_quic_connection_t *qc; | |
314 | |
315 qc = ngx_quic_get_connection(c); | |
316 | |
317 for (q = ngx_queue_head(&qc->sockets); | |
318 q != ngx_queue_sentinel(&qc->sockets); | |
319 q = ngx_queue_next(q)) | |
320 { | |
321 qsock = ngx_queue_data(q, ngx_quic_socket_t, queue); | |
322 | |
323 if (qsock->sid.seqnum == seqnum) { | |
324 return qsock; | |
325 } | |
326 } | |
327 | |
328 return NULL; | |
329 } | |
330 | |
331 | |
332 ngx_quic_socket_t * | |
333 ngx_quic_get_unconnected_socket(ngx_connection_t *c) | |
334 { | |
335 ngx_queue_t *q; | |
336 ngx_quic_socket_t *sock; | |
337 ngx_quic_connection_t *qc; | |
338 | |
339 qc = ngx_quic_get_connection(c); | |
340 | |
341 for (q = ngx_queue_head(&qc->sockets); | |
342 q != ngx_queue_sentinel(&qc->sockets); | |
343 q = ngx_queue_next(q)) | |
344 { | |
345 sock = ngx_queue_data(q, ngx_quic_socket_t, queue); | |
346 | |
347 if (sock->cid == NULL) { | |
348 return sock; | |
349 } | |
350 } | |
351 | |
352 return NULL; | |
353 } | |
354 | |
355 |