annotate src/event/quic/ngx_event_quic_migration.c @ 8917:bb1d1d9d76e2 quic

QUIC: removed excessive check. The c->udp->dgram may be NULL only if the quic connection was just created: the ngx_event_udp_recvmsg() passes information about datagrams to existing connections by providing information in c->udp. If case of a new connection, c->udp is allocated by the QUIC code during creation of quic connection (it uses c->sockaddr to initialize qsock->path). Thus the check for qsock->path is excessive and can be read wrong, assuming that other options possible, leading to warnings from clang static analyzer.
author Vladimir Homutov <vl@nginx.com>
date Wed, 01 Dec 2021 18:33:29 +0300
parents 40445fc7c403
children 501f28679d56
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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76f476ce4d31 QUIC: distinct files for connection migration.
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1
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2 /*
76f476ce4d31 QUIC: distinct files for connection migration.
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3 * Copyright (C) Nginx, Inc.
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_event_quic_connection.h>
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12
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13 static void ngx_quic_set_connection_path(ngx_connection_t *c,
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14 ngx_quic_path_t *path);
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15 static ngx_int_t ngx_quic_validate_path(ngx_connection_t *c,
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16 ngx_quic_socket_t *qsock);
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17 static ngx_int_t ngx_quic_send_path_challenge(ngx_connection_t *c,
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18 ngx_quic_path_t *path);
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19 static ngx_int_t ngx_quic_path_restore(ngx_connection_t *c);
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20 static ngx_quic_path_t *ngx_quic_alloc_path(ngx_connection_t *c);
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21
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22
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23 ngx_int_t
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24 ngx_quic_handle_path_challenge_frame(ngx_connection_t *c,
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25 ngx_quic_path_challenge_frame_t *f)
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26 {
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27 off_t max, pad;
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28 ssize_t sent;
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29 ngx_quic_path_t *path;
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30 ngx_quic_frame_t frame, *fp;
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31 ngx_quic_socket_t *qsock;
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32 ngx_quic_connection_t *qc;
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33
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34 qc = ngx_quic_get_connection(c);
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35
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36 frame.level = ssl_encryption_application;
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37 frame.type = NGX_QUIC_FT_PATH_RESPONSE;
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38 frame.u.path_response = *f;
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39
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40 /*
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41 * RFC 9000, 8.2.2. Path Validation Responses
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42 *
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43 * A PATH_RESPONSE frame MUST be sent on the network path where the
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44 * PATH_CHALLENGE frame was received.
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45 */
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46 qsock = ngx_quic_get_socket(c);
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47 path = qsock->path;
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48
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49 /*
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50 * An endpoint MUST expand datagrams that contain a PATH_RESPONSE frame
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51 * to at least the smallest allowed maximum datagram size of 1200 bytes.
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52 * ...
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53 * An endpoint MUST NOT expand the datagram containing the PATH_RESPONSE
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54 * if the resulting data exceeds the anti-amplification limit.
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55 */
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56 if (path->state != NGX_QUIC_PATH_VALIDATED) {
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57 max = path->received * 3;
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58 max = (path->sent >= max) ? 0 : max - path->sent;
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59 pad = ngx_min(1200, max);
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60
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61 } else {
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62 pad = 1200;
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63 }
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64
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65 sent = ngx_quic_frame_sendto(c, &frame, pad, path->sockaddr, path->socklen);
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66 if (sent < 0) {
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67 return NGX_ERROR;
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68 }
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69
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70 path->sent += sent;
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71
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72 if (qsock == qc->socket) {
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73 /*
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74 * RFC 9000, 9.3.3. Off-Path Packet Forwarding
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75 *
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76 * An endpoint that receives a PATH_CHALLENGE on an active path SHOULD
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77 * send a non-probing packet in response.
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78 */
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79
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80 fp = ngx_quic_alloc_frame(c);
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81 if (fp == NULL) {
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82 return NGX_ERROR;
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83 }
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84
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85 fp->level = ssl_encryption_application;
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86 fp->type = NGX_QUIC_FT_PING;
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87
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88 ngx_quic_queue_frame(qc, fp);
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89 }
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90
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91 return NGX_OK;
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92 }
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93
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94
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95 ngx_int_t
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96 ngx_quic_handle_path_response_frame(ngx_connection_t *c,
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97 ngx_quic_path_challenge_frame_t *f)
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98 {
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99 ngx_queue_t *q;
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100 ngx_quic_path_t *path, *prev;
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101 ngx_quic_connection_t *qc;
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102
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103 qc = ngx_quic_get_connection(c);
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104
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105 /*
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106 * RFC 9000, 8.2.3. Successful Path Validation
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107 *
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108 * A PATH_RESPONSE frame received on any network path validates the path
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109 * on which the PATH_CHALLENGE was sent.
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110 */
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111
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112 for (q = ngx_queue_head(&qc->paths);
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113 q != ngx_queue_sentinel(&qc->paths);
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114 q = ngx_queue_next(q))
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115 {
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116 path = ngx_queue_data(q, ngx_quic_path_t, queue);
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117
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118 if (path->state != NGX_QUIC_PATH_VALIDATING) {
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119 continue;
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120 }
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121
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122 if (ngx_memcmp(path->challenge1, f->data, sizeof(f->data)) == 0
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123 || ngx_memcmp(path->challenge2, f->data, sizeof(f->data)) == 0)
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124 {
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125 goto valid;
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126 }
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127 }
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128
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129 ngx_log_error(NGX_LOG_INFO, c->log, 0,
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130 "quic stale PATH_RESPONSE ignored");
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131
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132 return NGX_OK;
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133
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134 valid:
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135
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136 /*
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137 * RFC 9000, 9.4. Loss Detection and Congestion Control
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138 *
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139 * On confirming a peer's ownership of its new address,
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140 * an endpoint MUST immediately reset the congestion controller
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141 * and round-trip time estimator for the new path to initial values
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142 * unless the only change in the peer's address is its port number.
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
143 */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
144
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
145 prev = qc->backup->path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
146
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
147 if (ngx_cmp_sockaddr(prev->sockaddr, prev->socklen,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
148 path->sockaddr, path->socklen, 0)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
149 != NGX_OK)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
150 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
151 /* address has changed */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
152 ngx_memzero(&qc->congestion, sizeof(ngx_quic_congestion_t));
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
153
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
154 qc->congestion.window = ngx_min(10 * qc->tp.max_udp_payload_size,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
155 ngx_max(2 * qc->tp.max_udp_payload_size,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
156 14720));
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
157 qc->congestion.ssthresh = (size_t) -1;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
158 qc->congestion.recovery_start = ngx_current_msec;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
159 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
160
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
161 /*
8797
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
162 * RFC 9000, 9.3. Responding to Connection Migration
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
163 *
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
164 * After verifying a new client address, the server SHOULD
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
165 * send new address validation tokens (Section 8) to the client.
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
166 */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
167
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
168 if (ngx_quic_send_new_token(c, path) != NGX_OK) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
169 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
170 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
171
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
172 ngx_log_error(NGX_LOG_INFO, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
173 "quic path #%uL successfully validated", path->seqnum);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
174
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
175 path->state = NGX_QUIC_PATH_VALIDATED;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
176 path->validated_at = ngx_time();
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
177
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
178 return NGX_OK;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
179 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
180
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
181
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
182 static ngx_quic_path_t *
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
183 ngx_quic_alloc_path(ngx_connection_t *c)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
184 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
185 ngx_queue_t *q;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
186 struct sockaddr *sa;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
187 ngx_quic_path_t *path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
188 ngx_quic_connection_t *qc;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
189
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
190 qc = ngx_quic_get_connection(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
191
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
192 if (!ngx_queue_empty(&qc->free_paths)) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
193
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
194 q = ngx_queue_head(&qc->free_paths);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
195 path = ngx_queue_data(q, ngx_quic_path_t, queue);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
196
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
197 ngx_queue_remove(&path->queue);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
198
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
199 sa = path->sockaddr;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
200 ngx_memzero(path, sizeof(ngx_quic_path_t));
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
201 path->sockaddr = sa;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
202
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
203 } else {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
204
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
205 path = ngx_pcalloc(c->pool, sizeof(ngx_quic_path_t));
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
206 if (path == NULL) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
207 return NULL;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
208 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
209
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
210 path->sockaddr = ngx_palloc(c->pool, NGX_SOCKADDRLEN);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
211 if (path->sockaddr == NULL) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
212 return NULL;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
213 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
214 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
215
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
216 return path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
217 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
218
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
219
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
220 ngx_quic_path_t *
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
221 ngx_quic_add_path(ngx_connection_t *c, struct sockaddr *sockaddr,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
222 socklen_t socklen)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
223 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
224 ngx_quic_path_t *path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
225 ngx_quic_connection_t *qc;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
226
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
227 qc = ngx_quic_get_connection(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
228
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
229 path = ngx_quic_alloc_path(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
230 if (path == NULL) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
231 return NULL;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
232 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
233
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
234 path->seqnum = qc->path_seqnum++;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
235
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
236 path->socklen = socklen;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
237 ngx_memcpy(path->sockaddr, sockaddr, socklen);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
238
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
239 path->addr_text.data = path->text;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
240 path->addr_text.len = ngx_sock_ntop(sockaddr, socklen, path->text,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
241 NGX_SOCKADDR_STRLEN, 1);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
242
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
243 ngx_queue_insert_tail(&qc->paths, &path->queue);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
244
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
245 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
246 "quic path #%uL created src:%V",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
247 path->seqnum, &path->addr_text);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
248
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
249 return path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
250 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
251
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
252
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
253 ngx_quic_path_t *
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
254 ngx_quic_find_path(ngx_connection_t *c, struct sockaddr *sockaddr,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
255 socklen_t socklen)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
256 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
257 ngx_queue_t *q;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
258 ngx_quic_path_t *path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
259 ngx_quic_connection_t *qc;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
260
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
261 qc = ngx_quic_get_connection(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
262
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
263 for (q = ngx_queue_head(&qc->paths);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
264 q != ngx_queue_sentinel(&qc->paths);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
265 q = ngx_queue_next(q))
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
266 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
267 path = ngx_queue_data(q, ngx_quic_path_t, queue);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
268
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
269 if (ngx_cmp_sockaddr(sockaddr, socklen,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
270 path->sockaddr, path->socklen, 1)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
271 == NGX_OK)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
272 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
273 return path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
274 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
275 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
276
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
277 return NULL;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
278 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
279
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
280
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
281 ngx_int_t
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
282 ngx_quic_update_paths(ngx_connection_t *c, ngx_quic_header_t *pkt)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
283 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
284 off_t len;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
285 ngx_quic_path_t *path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
286 ngx_quic_socket_t *qsock;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
287 ngx_quic_client_id_t *cid;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
288 ngx_quic_connection_t *qc;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
289
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
290 qsock = ngx_quic_get_socket(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
291
8917
bb1d1d9d76e2 QUIC: removed excessive check.
Vladimir Homutov <vl@nginx.com>
parents: 8913
diff changeset
292 if (c->udp->dgram == NULL) {
8913
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
293 /* 1st ever packet in connection, path already exists */
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
294 path = qsock->path;
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
295 goto update;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
296 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
297
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
298 path = ngx_quic_find_path(c, c->udp->dgram->sockaddr,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
299 c->udp->dgram->socklen);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
300
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
301 if (path == NULL) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
302 path = ngx_quic_add_path(c, c->udp->dgram->sockaddr,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
303 c->udp->dgram->socklen);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
304 if (path == NULL) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
305 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
306 }
8913
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
307
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
308 if (qsock->path) {
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
309 /* NAT rebinding case: packet to same CID, but from new address */
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
310
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
311 ngx_quic_unref_path(c, qsock->path);
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
312
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
313 qsock->path = path;
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
314 path->refcnt++;
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
315
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
316 goto update;
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
317 }
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
318
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
319 } else if (qsock->path) {
40445fc7c403 QUIC: fixed migration during NAT rebinding.
Vladimir Homutov <vl@nginx.com>
parents: 8912
diff changeset
320 goto update;
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
321 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
322
8777
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
323 /* prefer unused client IDs if available */
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
324 cid = ngx_quic_next_client_id(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
325 if (cid == NULL) {
8777
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
326
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
327 /* try to reuse connection ID used on the same path */
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
328 cid = ngx_quic_used_client_id(c, path);
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
329 if (cid == NULL) {
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
330
8777
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
331 qc = ngx_quic_get_connection(c);
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
332 qc->error = NGX_QUIC_ERR_CONNECTION_ID_LIMIT_ERROR;
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
333 qc->error_reason = "no available client ids for new path";
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
334
8777
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
335 ngx_log_error(NGX_LOG_ERR, c->log, 0,
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
336 "no available client ids for new path");
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
337
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
338 return NGX_ERROR;
d5f93733c17d QUIC: relaxed client id requirements.
Vladimir Homutov <vl@nginx.com>
parents: 8763
diff changeset
339 }
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
340 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
341
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
342 ngx_quic_connect(c, qsock, path, cid);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
343
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
344 update:
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
345
8912
50d73bf20e73 QUIC: refactored multiple QUIC packets handling.
Vladimir Homutov <vl@nginx.com>
parents: 8901
diff changeset
346 len = pkt->raw->last - pkt->raw->start;
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
347
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
348 /* TODO: this may be too late in some cases;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
349 * for example, if error happens during decrypt(), we cannot
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
350 * send CC, if error happens in 1st packet, due to amplification
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
351 * limit, because path->received = 0
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
352 *
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
353 * should we account garbage as received or only decrypting packets?
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
354 */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
355 path->received += len;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
356
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
357 ngx_log_debug6(NGX_LOG_DEBUG_EVENT, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
358 "quic packet via #%uL:%uL:%uL"
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
359 " size:%O path recvd:%O sent:%O",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
360 qsock->sid.seqnum, qsock->cid->seqnum, path->seqnum,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
361 len, path->received, path->sent);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
362
8737
76f476ce4d31 QUIC: distinct files for connection migration.
Vladimir Homutov <vl@nginx.com>
parents:
diff changeset
363 return NGX_OK;
76f476ce4d31 QUIC: distinct files for connection migration.
Vladimir Homutov <vl@nginx.com>
parents:
diff changeset
364 }
76f476ce4d31 QUIC: distinct files for connection migration.
Vladimir Homutov <vl@nginx.com>
parents:
diff changeset
365
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
366
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
367 static void
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
368 ngx_quic_set_connection_path(ngx_connection_t *c, ngx_quic_path_t *path)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
369 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
370 size_t len;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
371
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
372 ngx_memcpy(c->sockaddr, path->sockaddr, path->socklen);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
373 c->socklen = path->socklen;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
374
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
375 if (c->addr_text.data) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
376 len = ngx_min(c->addr_text.len, path->addr_text.len);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
377
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
378 ngx_memcpy(c->addr_text.data, path->addr_text.data, len);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
379 c->addr_text.len = len;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
380 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
381
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
382 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
383 "quic send path set to #%uL addr:%V",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
384 path->seqnum, &path->addr_text);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
385 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
386
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
387
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
388 ngx_int_t
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
389 ngx_quic_handle_migration(ngx_connection_t *c, ngx_quic_header_t *pkt)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
390 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
391 ngx_quic_path_t *next;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
392 ngx_quic_socket_t *qsock;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
393 ngx_quic_send_ctx_t *ctx;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
394 ngx_quic_connection_t *qc;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
395
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
396 /* got non-probing packet via non-active socket with different path */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
397
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
398 qc = ngx_quic_get_connection(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
399
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
400 /* current socket, different from active */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
401 qsock = ngx_quic_get_socket(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
402
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
403 next = qsock->path; /* going to migrate to this path... */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
404
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
405 ngx_log_error(NGX_LOG_INFO, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
406 "quic migration from #%uL:%uL:%uL (%s)"
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
407 " to #%uL:%uL:%uL (%s)",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
408 qc->socket->sid.seqnum, qc->socket->cid->seqnum,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
409 qc->socket->path->seqnum,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
410 ngx_quic_path_state_str(qc->socket->path),
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
411 qsock->sid.seqnum, qsock->cid->seqnum, next->seqnum,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
412 ngx_quic_path_state_str(next));
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
413
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
414 switch (next->state) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
415 case NGX_QUIC_PATH_NEW:
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
416 if (ngx_quic_validate_path(c, qsock) != NGX_OK) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
417 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
418 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
419 break;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
420
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
421 /* migration to previously known path */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
422
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
423 case NGX_QUIC_PATH_VALIDATING:
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
424 /* alredy validating, nothing to do */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
425 break;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
426
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
427 case NGX_QUIC_PATH_VALIDATED:
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
428 /* if path is old enough, revalidate */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
429 if (ngx_time() - next->validated_at > NGX_QUIC_PATH_VALID_TIME) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
430
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
431 next->state = NGX_QUIC_PATH_NEW;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
432
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
433 if (ngx_quic_validate_path(c, qsock) != NGX_OK) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
434 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
435 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
436 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
437
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
438 break;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
439 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
440
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
441 ctx = ngx_quic_get_send_ctx(qc, pkt->level);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
442
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
443 /*
8797
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
444 * RFC 9000, 9.3. Responding to Connection Migration
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
445 *
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
446 * An endpoint only changes the address to which it sends packets in
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
447 * response to the highest-numbered non-probing packet.
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
448 */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
449 if (pkt->pn != ctx->largest_pn) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
450 return NGX_OK;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
451 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
452
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
453 /* switching connection to new path */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
454
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
455 ngx_quic_set_connection_path(c, next);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
456
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
457 /*
8797
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
458 * RFC 9000, 9.5. Privacy Implications of Connection Migration
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
459 *
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
460 * An endpoint MUST NOT reuse a connection ID when sending to
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
461 * more than one destination address.
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
462 */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
463
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
464 /* preserve valid path we are migrating from */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
465 if (qc->socket->path->state == NGX_QUIC_PATH_VALIDATED) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
466
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
467 if (qc->backup) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
468 ngx_quic_close_socket(c, qc->backup);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
469 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
470
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
471 qc->backup = qc->socket;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
472
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
473 ngx_log_error(NGX_LOG_INFO, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
474 "quic backup socket is now #%uL:%uL:%uL (%s)",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
475 qc->backup->sid.seqnum, qc->backup->cid->seqnum,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
476 qc->backup->path->seqnum,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
477 ngx_quic_path_state_str(qc->backup->path));
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
478 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
479
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
480 qc->socket = qsock;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
481
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
482 ngx_log_error(NGX_LOG_INFO, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
483 "quic active socket is now #%uL:%uL:%uL (%s)",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
484 qsock->sid.seqnum, qsock->cid->seqnum,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
485 qsock->path->seqnum, ngx_quic_path_state_str(qsock->path));
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
486
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
487 return NGX_OK;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
488 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
489
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
490
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
491 static ngx_int_t
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
492 ngx_quic_validate_path(ngx_connection_t *c, ngx_quic_socket_t *qsock)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
493 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
494 ngx_msec_t pto;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
495 ngx_quic_path_t *path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
496 ngx_quic_send_ctx_t *ctx;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
497 ngx_quic_connection_t *qc;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
498
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
499 qc = ngx_quic_get_connection(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
500
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
501 path = qsock->path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
502
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
503 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
504 "quic initiated validation of new path #%uL",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
505 path->seqnum);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
506
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
507 path->state = NGX_QUIC_PATH_VALIDATING;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
508
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
509 if (RAND_bytes(path->challenge1, 8) != 1) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
510 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
511 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
512
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
513 if (RAND_bytes(path->challenge2, 8) != 1) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
514 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
515 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
516
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
517 if (ngx_quic_send_path_challenge(c, path) != NGX_OK) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
518 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
519 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
520
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
521 ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_application);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
522 pto = ngx_quic_pto(c, ctx);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
523
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
524 path->expires = ngx_current_msec + pto;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
525 path->tries = NGX_QUIC_PATH_RETRIES;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
526
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
527 if (!qc->path_validation.timer_set) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
528 ngx_add_timer(&qc->path_validation, pto);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
529 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
530
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
531 return NGX_OK;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
532 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
533
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
534
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
535 static ngx_int_t
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
536 ngx_quic_send_path_challenge(ngx_connection_t *c, ngx_quic_path_t *path)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
537 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
538 off_t max, pad;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
539 ssize_t sent;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
540 ngx_quic_frame_t frame;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
541
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
542 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
543 "quic path #%uL send path challenge tries:%ui",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
544 path->seqnum, path->tries);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
545
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
546 frame.level = ssl_encryption_application;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
547 frame.type = NGX_QUIC_FT_PATH_CHALLENGE;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
548
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
549 ngx_memcpy(frame.u.path_challenge.data, path->challenge1, 8);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
550
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
551 /*
8797
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
552 * RFC 9000, 8.2.1. Initiating Path Validation
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
553 *
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
554 * An endpoint MUST expand datagrams that contain a PATH_CHALLENGE frame
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
555 * to at least the smallest allowed maximum datagram size of 1200 bytes,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
556 * unless the anti-amplification limit for the path does not permit
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
557 * sending a datagram of this size.
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
558 */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
559
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
560 /* same applies to PATH_RESPONSE frames */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
561
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
562 max = path->received * 3;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
563 max = (path->sent >= max) ? 0 : max - path->sent;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
564 pad = ngx_min(1200, max);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
565
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
566 sent = ngx_quic_frame_sendto(c, &frame, pad, path->sockaddr, path->socklen);
8822
ad046179eb91 QUIC: handle EAGAIN properly on UDP sockets.
Vladimir Homutov <vl@nginx.com>
parents: 8797
diff changeset
567 if (sent < 0) {
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
568 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
569 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
570
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
571 path->sent += sent;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
572
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
573 ngx_memcpy(frame.u.path_challenge.data, path->challenge2, 8);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
574
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
575 max = (path->sent >= max) ? 0 : max - path->sent;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
576 pad = ngx_min(1200, max);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
577
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
578 sent = ngx_quic_frame_sendto(c, &frame, pad, path->sockaddr, path->socklen);
8822
ad046179eb91 QUIC: handle EAGAIN properly on UDP sockets.
Vladimir Homutov <vl@nginx.com>
parents: 8797
diff changeset
579 if (sent < 0) {
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
580 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
581 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
582
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
583 path->sent += sent;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
584
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
585 return NGX_OK;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
586 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
587
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
588
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
589 void
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
590 ngx_quic_path_validation_handler(ngx_event_t *ev)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
591 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
592 ngx_msec_t now;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
593 ngx_queue_t *q;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
594 ngx_msec_int_t left, next, pto;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
595 ngx_quic_path_t *path;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
596 ngx_connection_t *c;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
597 ngx_quic_send_ctx_t *ctx;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
598 ngx_quic_connection_t *qc;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
599
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
600 c = ev->data;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
601 qc = ngx_quic_get_connection(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
602
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
603 ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_application);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
604 pto = ngx_quic_pto(c, ctx);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
605
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
606 next = -1;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
607 now = ngx_current_msec;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
608
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
609 for (q = ngx_queue_head(&qc->paths);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
610 q != ngx_queue_sentinel(&qc->paths);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
611 q = ngx_queue_next(q))
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
612 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
613 path = ngx_queue_data(q, ngx_quic_path_t, queue);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
614
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
615 if (path->state != NGX_QUIC_PATH_VALIDATING) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
616 continue;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
617 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
618
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
619 left = path->expires - now;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
620
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
621 if (left > 0) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
622
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
623 if (next == -1 || left < next) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
624 next = path->expires;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
625 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
626
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
627 continue;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
628 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
629
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
630 if (--path->tries) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
631 path->expires = ngx_current_msec + pto;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
632
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
633 if (next == -1 || pto < next) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
634 next = pto;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
635 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
636
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
637 /* retransmit */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
638 (void) ngx_quic_send_path_challenge(c, path);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
639
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
640 continue;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
641 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
642
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
643 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
644 "quic path #%uL validation failed", path->seqnum);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
645
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
646 /* found expired path */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
647
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
648 path->state = NGX_QUIC_PATH_NEW;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
649
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
650 /*
8797
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
651 * RFC 9000, 9.4. Loss Detection and Congestion Control
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
652 *
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
653 * If the timer fires before the PATH_RESPONSE is received, the
8797
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
654 * endpoint might send a new PATH_CHALLENGE and restart the timer for
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
655 * a longer period of time. This timer SHOULD be set as described in
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
656 * Section 6.2.1 of [QUIC-RECOVERY] and MUST NOT be more aggressive.
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
657 */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
658
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
659 if (qc->socket->path != path) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
660 /* the path was not actually used */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
661 continue;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
662 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
663
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
664 if (ngx_quic_path_restore(c) != NGX_OK) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
665 qc->error = NGX_QUIC_ERR_NO_VIABLE_PATH;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
666 qc->error_reason = "no viable path";
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
667 ngx_quic_close_connection(c, NGX_ERROR);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
668 return;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
669 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
670 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
671
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
672 if (next != -1) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
673 ngx_add_timer(&qc->path_validation, next);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
674 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
675 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
676
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
677
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
678 static ngx_int_t
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
679 ngx_quic_path_restore(ngx_connection_t *c)
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
680 {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
681 ngx_quic_socket_t *qsock;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
682 ngx_quic_connection_t *qc;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
683
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
684 qc = ngx_quic_get_connection(c);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
685
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
686 /*
8797
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
687 * RFC 9000, 9.1. Probing a New Path
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
688 *
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
689 * Failure to validate a path does not cause the connection to end
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
690 *
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
691 * RFC 9000, 9.3.2. On-Path Address Spoofing
4715f3e669f1 QUIC: updated specification references.
Sergey Kandaurov <pluknet@nginx.com>
parents: 8778
diff changeset
692 *
8763
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
693 * To protect the connection from failing due to such a spurious
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
694 * migration, an endpoint MUST revert to using the last validated
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
695 * peer address when validation of a new peer address fails.
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
696 */
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
697
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
698 if (qc->backup == NULL) {
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
699 return NGX_ERROR;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
700 }
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
701
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
702 qc->socket = qc->backup;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
703 qc->backup = NULL;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
704
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
705 qsock = qc->socket;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
706
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
707 ngx_log_error(NGX_LOG_INFO, c->log, 0,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
708 "quic active socket is restored to #%uL:%uL:%uL"
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
709 " (%s), no backup",
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
710 qsock->sid.seqnum, qsock->cid->seqnum, qsock->path->seqnum,
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
711 ngx_quic_path_state_str(qsock->path));
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
712
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
713 ngx_quic_set_connection_path(c, qsock->path);
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
714
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
715 return NGX_OK;
4117aa7fa38e QUIC: connection migration.
Vladimir Homutov <vl@nginx.com>
parents: 8747
diff changeset
716 }