/*
* Copyright (C) Nginx, Inc.
* Copyright (C) Valentin V. Bartenev
*/
#ifndef _NGX_HTTP_V2_H_INCLUDED_
#define _NGX_HTTP_V2_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define NGX_HTTP_V2_ALPN_PROTO "\x02h2"
#define NGX_HTTP_V2_STATE_BUFFER_SIZE 16
#define NGX_HTTP_V2_DEFAULT_FRAME_SIZE (1 << 14)
#define NGX_HTTP_V2_MAX_FRAME_SIZE ((1 << 24) - 1)
#define NGX_HTTP_V2_INT_OCTETS 4
#define NGX_HTTP_V2_MAX_FIELD \
(127 + (1 << (NGX_HTTP_V2_INT_OCTETS - 1) * 7) - 1)
#define NGX_HTTP_V2_FRAME_HEADER_SIZE 9
/* frame types */
#define NGX_HTTP_V2_DATA_FRAME 0x0
#define NGX_HTTP_V2_HEADERS_FRAME 0x1
#define NGX_HTTP_V2_PRIORITY_FRAME 0x2
#define NGX_HTTP_V2_RST_STREAM_FRAME 0x3
#define NGX_HTTP_V2_SETTINGS_FRAME 0x4
#define NGX_HTTP_V2_PUSH_PROMISE_FRAME 0x5
#define NGX_HTTP_V2_PING_FRAME 0x6
#define NGX_HTTP_V2_GOAWAY_FRAME 0x7
#define NGX_HTTP_V2_WINDOW_UPDATE_FRAME 0x8
#define NGX_HTTP_V2_CONTINUATION_FRAME 0x9
/* frame flags */
#define NGX_HTTP_V2_NO_FLAG 0x00
#define NGX_HTTP_V2_ACK_FLAG 0x01
#define NGX_HTTP_V2_END_STREAM_FLAG 0x01
#define NGX_HTTP_V2_END_HEADERS_FLAG 0x04
#define NGX_HTTP_V2_PADDED_FLAG 0x08
#define NGX_HTTP_V2_PRIORITY_FLAG 0x20
#define NGX_HTTP_V2_MAX_WINDOW ((1U << 31) - 1)
#define NGX_HTTP_V2_DEFAULT_WINDOW 65535
#define NGX_HTTP_V2_DEFAULT_WEIGHT 16
typedef struct ngx_http_v2_connection_s ngx_http_v2_connection_t;
typedef struct ngx_http_v2_node_s ngx_http_v2_node_t;
typedef struct ngx_http_v2_out_frame_s ngx_http_v2_out_frame_t;
typedef u_char *(*ngx_http_v2_handler_pt) (ngx_http_v2_connection_t *h2c,
u_char *pos, u_char *end);
typedef struct {
ngx_flag_t enable;
size_t pool_size;
ngx_uint_t concurrent_streams;
size_t preread_size;
ngx_uint_t streams_index_mask;
} ngx_http_v2_srv_conf_t;
typedef struct {
ngx_str_t name;
ngx_str_t value;
} ngx_http_v2_header_t;
typedef struct {
ngx_uint_t sid;
size_t length;
size_t padding;
unsigned flags:8;
unsigned incomplete:1;
unsigned keep_pool:1;
/* HPACK */
unsigned parse_name:1;
unsigned parse_value:1;
unsigned index:1;
ngx_http_v2_header_t header;
size_t header_limit;
u_char field_state;
u_char *field_start;
u_char *field_end;
size_t field_rest;
ngx_pool_t *pool;
ngx_http_v2_stream_t *stream;
u_char buffer[NGX_HTTP_V2_STATE_BUFFER_SIZE];
size_t buffer_used;
ngx_http_v2_handler_pt handler;
} ngx_http_v2_state_t;
typedef struct {
ngx_http_v2_header_t **entries;
ngx_uint_t added;
ngx_uint_t deleted;
ngx_uint_t reused;
ngx_uint_t allocated;
size_t size;
size_t free;
u_char *storage;
u_char *pos;
} ngx_http_v2_hpack_t;
struct ngx_http_v2_connection_s {
ngx_connection_t *connection;
ngx_http_connection_t *http_connection;
off_t total_bytes;
off_t payload_bytes;
ngx_uint_t processing;
ngx_uint_t frames;
ngx_uint_t idle;
ngx_uint_t new_streams;
ngx_uint_t refused_streams;
ngx_uint_t priority_limit;
size_t send_window;
size_t recv_window;
size_t init_window;
size_t frame_size;
ngx_queue_t waiting;
ngx_http_v2_state_t state;
ngx_http_v2_hpack_t hpack;
ngx_pool_t *pool;
ngx_http_v2_out_frame_t *free_frames;
ngx_connection_t *free_fake_connections;
ngx_http_v2_node_t **streams_index;
ngx_http_v2_out_frame_t *last_out;
ngx_queue_t dependencies;
ngx_queue_t closed;
ngx_uint_t closed_nodes;
ngx_uint_t last_sid;
time_t lingering_time;
unsigned settings_ack:1;
unsigned table_update:1;
unsigned blocked:1;
unsigned goaway:1;
};
struct ngx_http_v2_node_s {
ngx_uint_t id;
ngx_http_v2_node_t *index;
ngx_http_v2_node_t *parent;
ngx_queue_t queue;
ngx_queue_t children;
ngx_queue_t reuse;
ngx_uint_t rank;
ngx_uint_t weight;
double rel_weight;
ngx_http_v2_stream_t *stream;
};
struct ngx_http_v2_stream_s {
ngx_http_request_t *request;
ngx_http_v2_connection_t *connection;
ngx_http_v2_node_t *node;
ngx_uint_t queued;
/*
* A change to SETTINGS_INITIAL_WINDOW_SIZE could cause the
* send_window to become negative, hence it's signed.
*/
ssize_t send_window;
size_t recv_window;
ngx_buf_t *preread;
ngx_uint_t frames;
ngx_http_v2_out_frame_t *free_frames;
ngx_chain_t *free_frame_headers;
ngx_chain_t *free_bufs;
ngx_queue_t queue;
ngx_array_t *cookies;
ngx_pool_t *pool;
unsigned waiting:1;
unsigned blocked:1;
unsigned exhausted:1;
unsigned in_closed:1;
unsigned out_closed:1;
unsigned rst_sent:1;
unsigned no_flow_control:1;
unsigned skip_data:1;
};
struct ngx_http_v2_out_frame_s {
ngx_http_v2_out_frame_t *next;
ngx_chain_t *first;
ngx_chain_t *last;
ngx_int_t (*handler)(ngx_http_v2_connection_t *h2c,
ngx_http_v2_out_frame_t *frame);
ngx_http_v2_stream_t *stream;
size_t length;
unsigned blocked:1;
unsigned fin:1;
};
static ngx_inline void
ngx_http_v2_queue_frame(ngx_http_v2_connection_t *h2c,
ngx_http_v2_out_frame_t *frame)
{
ngx_http_v2_out_frame_t **out;
for (out = &h2c->last_out; *out; out = &(*out)->next) {
if ((*out)->blocked || (*out)->stream == NULL) {
break;
}
if ((*out)->stream->node->rank < frame->stream->node->rank
|| ((*out)->stream->node->rank == frame->stream->node->rank
&& (*out)->stream->node->rel_weight
>= frame->stream->node->rel_weight))
{
break;
}
}
frame->next = *out;
*out = frame;
}
static ngx_inline void
ngx_http_v2_queue_blocked_frame(ngx_http_v2_connection_t *h2c,
ngx_http_v2_out_frame_t *frame)
{
ngx_http_v2_out_frame_t **out;
for (out = &h2c->last_out; *out; out = &(*out)->next) {
if ((*out)->blocked || (*out)->stream == NULL) {
break;
}
}
frame->next = *out;
*out = frame;
}
static ngx_inline void
ngx_http_v2_queue_ordered_frame(ngx_http_v2_connection_t *h2c,
ngx_http_v2_out_frame_t *frame)
{
frame->next = h2c->last_out;
h2c->last_out = frame;
}
void ngx_http_v2_init(ngx_event_t *rev);
ngx_int_t ngx_http_v2_read_request_body(ngx_http_request_t *r);
ngx_int_t ngx_http_v2_read_unbuffered_request_body(ngx_http_request_t *r);
void ngx_http_v2_close_stream(ngx_http_v2_stream_t *stream, ngx_int_t rc);
ngx_int_t ngx_http_v2_send_output_queue(ngx_http_v2_connection_t *h2c);
ngx_str_t *ngx_http_v2_get_static_name(ngx_uint_t index);
ngx_str_t *ngx_http_v2_get_static_value(ngx_uint_t index);
ngx_int_t ngx_http_v2_get_indexed_header(ngx_http_v2_connection_t *h2c,
ngx_uint_t index, ngx_uint_t name_only);
ngx_int_t ngx_http_v2_add_header(ngx_http_v2_connection_t *h2c,
ngx_http_v2_header_t *header);
ngx_int_t ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size);
#define ngx_http_v2_prefix(bits) ((1 << (bits)) - 1)
#if (NGX_HAVE_NONALIGNED)
#define ngx_http_v2_parse_uint16(p) ntohs(*(uint16_t *) (p))
#define ngx_http_v2_parse_uint32(p) ntohl(*(uint32_t *) (p))
#else
#define ngx_http_v2_parse_uint16(p) ((p)[0] << 8 | (p)[1])
#define ngx_http_v2_parse_uint32(p) \
((uint32_t) (p)[0] << 24 | (p)[1] << 16 | (p)[2] << 8 | (p)[3])
#endif
#define ngx_http_v2_parse_length(p) ((p) >> 8)
#define ngx_http_v2_parse_type(p) ((p) & 0xff)
#define ngx_http_v2_parse_sid(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff)
#define ngx_http_v2_parse_window(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff)
#define ngx_http_v2_write_uint16_aligned(p, s) \
(*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t))
#define ngx_http_v2_write_uint32_aligned(p, s) \
(*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t))
#if (NGX_HAVE_NONALIGNED)
#define ngx_http_v2_write_uint16 ngx_http_v2_write_uint16_aligned
#define ngx_http_v2_write_uint32 ngx_http_v2_write_uint32_aligned
#else
#define ngx_http_v2_write_uint16(p, s) \
((p)[0] = (u_char) ((s) >> 8), \
(p)[1] = (u_char) (s), \
(p) + sizeof(uint16_t))
#define ngx_http_v2_write_uint32(p, s) \
((p)[0] = (u_char) ((s) >> 24), \
(p)[1] = (u_char) ((s) >> 16), \
(p)[2] = (u_char) ((s) >> 8), \
(p)[3] = (u_char) (s), \
(p) + sizeof(uint32_t))
#endif
#define ngx_http_v2_write_len_and_type(p, l, t) \
ngx_http_v2_write_uint32_aligned(p, (l) << 8 | (t))
#define ngx_http_v2_write_sid ngx_http_v2_write_uint32
#define ngx_http_v2_indexed(i) (128 + (i))
#define ngx_http_v2_inc_indexed(i) (64 + (i))
#define ngx_http_v2_write_name(dst, src, len, tmp) \
ngx_http_v2_string_encode(dst, src, len, tmp, 1)
#define ngx_http_v2_write_value(dst, src, len, tmp) \
ngx_http_v2_string_encode(dst, src, len, tmp, 0)
#define NGX_HTTP_V2_ENCODE_RAW 0
#define NGX_HTTP_V2_ENCODE_HUFF 0x80
#define NGX_HTTP_V2_AUTHORITY_INDEX 1
#define NGX_HTTP_V2_METHOD_INDEX 2
#define NGX_HTTP_V2_METHOD_GET_INDEX 2
#define NGX_HTTP_V2_METHOD_POST_INDEX 3
#define NGX_HTTP_V2_PATH_INDEX 4
#define NGX_HTTP_V2_PATH_ROOT_INDEX 4
#define NGX_HTTP_V2_SCHEME_HTTP_INDEX 6
#define NGX_HTTP_V2_SCHEME_HTTPS_INDEX 7
#define NGX_HTTP_V2_STATUS_INDEX 8
#define NGX_HTTP_V2_STATUS_200_INDEX 8
#define NGX_HTTP_V2_STATUS_204_INDEX 9
#define NGX_HTTP_V2_STATUS_206_INDEX 10
#define NGX_HTTP_V2_STATUS_304_INDEX 11
#define NGX_HTTP_V2_STATUS_400_INDEX 12
#define NGX_HTTP_V2_STATUS_404_INDEX 13
#define NGX_HTTP_V2_STATUS_500_INDEX 14
#define NGX_HTTP_V2_CONTENT_LENGTH_INDEX 28
#define NGX_HTTP_V2_CONTENT_TYPE_INDEX 31
#define NGX_HTTP_V2_DATE_INDEX 33
#define NGX_HTTP_V2_LAST_MODIFIED_INDEX 44
#define NGX_HTTP_V2_LOCATION_INDEX 46
#define NGX_HTTP_V2_SERVER_INDEX 54
#define NGX_HTTP_V2_VARY_INDEX 59
#define NGX_HTTP_V2_PREFACE_START "PRI * HTTP/2.0\r\n"
#define NGX_HTTP_V2_PREFACE_END "\r\nSM\r\n\r\n"
#define NGX_HTTP_V2_PREFACE NGX_HTTP_V2_PREFACE_START \
NGX_HTTP_V2_PREFACE_END
u_char *ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len,
u_char *tmp, ngx_uint_t lower);
extern ngx_module_t ngx_http_v2_module;
#endif /* _NGX_HTTP_V2_H_INCLUDED_ */
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