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annotate src/http/v3/ngx_http_v3.c @ 8989:81a3429db8b0 quic

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HTTP/3: delayed Insert Count Increment instruction. Sending the instruction is delayed until the end of the current event cycle. Delaying the instruction is allowed by quic-qpack-21, section 2.2.2.3. The goal is to reduce the amount of data sent back to client by accumulating several inserts in one instruction and sometimes not sending the instruction at all, if Section Acknowledgement was sent just before it.
author Roman Arutyunyan <arut@nginx.com>
date Thu, 27 Jan 2022 12:20:47 +0300
parents 6434160b4b78
children 6546c2ae1c7b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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8774
f4d3f5d93a82 HTTP/3: moved session initialization to a separate file.
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1
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2 /*
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3 * Copyright (C) Roman Arutyunyan
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 static void ngx_http_v3_keepalive_handler(ngx_event_t *ev);
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14 static void ngx_http_v3_cleanup_session(void *data);
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15
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16
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17 ngx_int_t
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18 ngx_http_v3_init_session(ngx_connection_t *c)
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19 {
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20 ngx_connection_t *pc;
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21 ngx_pool_cleanup_t *cln;
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22 ngx_http_connection_t *hc;
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23 ngx_http_v3_session_t *h3c;
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24
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25 pc = c->quic->parent;
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26 hc = pc->data;
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27
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28 if (hc->v3_session) {
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29 return NGX_OK;
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30 }
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31
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32 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 init session");
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33
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34 h3c = ngx_pcalloc(pc->pool, sizeof(ngx_http_v3_session_t));
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35 if (h3c == NULL) {
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36 goto failed;
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37 }
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38
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39 h3c->max_push_id = (uint64_t) -1;
8796
1fec68e322d0 HTTP/3: client GOAWAY support.
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40 h3c->goaway_push_id = (uint64_t) -1;
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41
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42 ngx_queue_init(&h3c->blocked);
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43 ngx_queue_init(&h3c->pushing);
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44
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45 h3c->keepalive.log = pc->log;
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46 h3c->keepalive.data = pc;
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47 h3c->keepalive.handler = ngx_http_v3_keepalive_handler;
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48 h3c->keepalive.cancelable = 1;
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49
8989
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50 h3c->table.send_insert_count.log = pc->log;
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51 h3c->table.send_insert_count.data = pc;
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52 h3c->table.send_insert_count.handler = ngx_http_v3_inc_insert_count_handler;
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53
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54 cln = ngx_pool_cleanup_add(pc->pool, 0);
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55 if (cln == NULL) {
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56 goto failed;
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57 }
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58
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59 cln->handler = ngx_http_v3_cleanup_session;
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60 cln->data = h3c;
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61
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62 hc->v3_session = h3c;
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63
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64 return ngx_http_v3_send_settings(c);
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65
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66 failed:
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67
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68 ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to create http3 session");
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69
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70 ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_INTERNAL_ERROR,
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71 "failed to create http3 session");
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72 return NGX_ERROR;
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73 }
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74
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75
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76 static void
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77 ngx_http_v3_keepalive_handler(ngx_event_t *ev)
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78 {
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79 ngx_connection_t *c;
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80
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81 c = ev->data;
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82
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83 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 keepalive handler");
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84
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6434160b4b78 QUIC: allowed main QUIC connection for some operations.
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85 ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_NO_ERROR,
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86 "keepalive timeout");
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87 }
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88
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89
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90 static void
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91 ngx_http_v3_cleanup_session(void *data)
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92 {
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93 ngx_http_v3_session_t *h3c = data;
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94
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6e2c23481abb HTTP/3: clean up table from session cleanup handler.
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95 ngx_http_v3_cleanup_table(h3c);
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96
8774
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97 if (h3c->keepalive.timer_set) {
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98 ngx_del_timer(&h3c->keepalive);
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99 }
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100
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101 if (h3c->table.send_insert_count.posted) {
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102 ngx_delete_posted_event(&h3c->table.send_insert_count);
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103 }
8774
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104 }
8881
72b304f6207c HTTP/3: traffic-based flood detection.
Roman Arutyunyan <arut@nginx.com>
parents: 8796
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105
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106
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107 ngx_int_t
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108 ngx_http_v3_check_flood(ngx_connection_t *c)
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109 {
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110 ngx_http_v3_session_t *h3c;
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111
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112 h3c = ngx_http_v3_get_session(c);
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113
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114 if (h3c->total_bytes / 8 > h3c->payload_bytes + 1048576) {
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115 ngx_log_error(NGX_LOG_INFO, c->log, 0, "http3 flood detected");
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diff changeset
116
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117 ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_NO_ERROR,
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118 "HTTP/3 flood detected");
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119 return NGX_ERROR;
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120 }
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121
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122 return NGX_OK;
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123 }