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Diffstat (limited to 'src/mux_h2.c')
| -rw-r--r-- | src/mux_h2.c | 7598 |
1 files changed, 7598 insertions, 0 deletions
diff --git a/src/mux_h2.c b/src/mux_h2.c new file mode 100644 index 0000000..273e1f5 --- /dev/null +++ b/src/mux_h2.c @@ -0,0 +1,7598 @@ +/* + * HTTP/2 mux-demux for connections + * + * Copyright 2017 Willy Tarreau <w@1wt.eu> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + */ + +#include <import/eb32tree.h> +#include <import/ebmbtree.h> +#include <haproxy/api.h> +#include <haproxy/cfgparse.h> +#include <haproxy/connection.h> +#include <haproxy/dynbuf.h> +#include <haproxy/h2.h> +#include <haproxy/hpack-dec.h> +#include <haproxy/hpack-enc.h> +#include <haproxy/hpack-tbl.h> +#include <haproxy/http_htx.h> +#include <haproxy/htx.h> +#include <haproxy/istbuf.h> +#include <haproxy/log.h> +#include <haproxy/mux_h2-t.h> +#include <haproxy/net_helper.h> +#include <haproxy/proxy.h> +#include <haproxy/server.h> +#include <haproxy/session-t.h> +#include <haproxy/stats.h> +#include <haproxy/stconn.h> +#include <haproxy/stream.h> +#include <haproxy/trace.h> +#include <haproxy/xref.h> + + +/* dummy streams returned for closed, error, refused, idle and states */ +static const struct h2s *h2_closed_stream; +static const struct h2s *h2_error_stream; +static const struct h2s *h2_refused_stream; +static const struct h2s *h2_idle_stream; + + +/**** H2 connection descriptor ****/ +struct h2c { + struct connection *conn; + + enum h2_cs st0; /* mux state */ + enum h2_err errcode; /* H2 err code (H2_ERR_*) */ + + /* 16 bit hole here */ + uint32_t flags; /* connection flags: H2_CF_* */ + uint32_t streams_limit; /* maximum number of concurrent streams the peer supports */ + int32_t max_id; /* highest ID known on this connection, <0 before preface */ + uint32_t rcvd_c; /* newly received data to ACK for the connection */ + uint32_t rcvd_s; /* newly received data to ACK for the current stream (dsi) or zero */ + + /* states for the demux direction */ + struct hpack_dht *ddht; /* demux dynamic header table */ + struct buffer dbuf; /* demux buffer */ + + int32_t dsi; /* demux stream ID (<0 = idle) */ + int32_t dfl; /* demux frame length (if dsi >= 0) */ + int8_t dft; /* demux frame type (if dsi >= 0) */ + int8_t dff; /* demux frame flags (if dsi >= 0) */ + uint8_t dpl; /* demux pad length (part of dfl), init to 0 */ + /* 8 bit hole here */ + int32_t last_sid; /* last processed stream ID for GOAWAY, <0 before preface */ + + /* states for the mux direction */ + struct buffer mbuf[H2C_MBUF_CNT]; /* mux buffers (ring) */ + int32_t miw; /* mux initial window size for all new streams */ + int32_t mws; /* mux window size. Can be negative. */ + int32_t mfs; /* mux's max frame size */ + + int timeout; /* idle timeout duration in ticks */ + int shut_timeout; /* idle timeout duration in ticks after GOAWAY was sent */ + int idle_start; /* date of the last time the connection went idle (no stream + empty mbuf), or the start of current http req */ + /* 32-bit hole here */ + unsigned int nb_streams; /* number of streams in the tree */ + unsigned int nb_sc; /* number of attached stream connectors */ + unsigned int nb_reserved; /* number of reserved streams */ + unsigned int stream_cnt; /* total number of streams seen */ + struct proxy *proxy; /* the proxy this connection was created for */ + struct task *task; /* timeout management task */ + struct h2_counters *px_counters; /* h2 counters attached to proxy */ + struct eb_root streams_by_id; /* all active streams by their ID */ + struct list send_list; /* list of blocked streams requesting to send */ + struct list fctl_list; /* list of streams blocked by connection's fctl */ + struct list blocked_list; /* list of streams blocked for other reasons (e.g. sfctl, dep) */ + struct buffer_wait buf_wait; /* wait list for buffer allocations */ + struct wait_event wait_event; /* To be used if we're waiting for I/Os */ +}; + + +/* H2 stream descriptor, describing the stream as it appears in the H2C, and as + * it is being processed in the internal HTTP representation (HTX). + */ +struct h2s { + struct sedesc *sd; + struct session *sess; + struct h2c *h2c; + struct eb32_node by_id; /* place in h2c's streams_by_id */ + int32_t id; /* stream ID */ + uint32_t flags; /* H2_SF_* */ + int sws; /* stream window size, to be added to the mux's initial window size */ + enum h2_err errcode; /* H2 err code (H2_ERR_*) */ + enum h2_ss st; + uint16_t status; /* HTTP response status */ + unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */ + struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */ + struct wait_event *subs; /* recv wait_event the stream connector associated is waiting on (via h2_subscribe) */ + struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */ + struct tasklet *shut_tl; /* deferred shutdown tasklet, to retry to send an RST after we failed to, + * in case there's no other subscription to do it */ + + char upgrade_protocol[16]; /* rfc 8441: requested protocol on Extended CONNECT */ +}; + +/* descriptor for an h2 frame header */ +struct h2_fh { + uint32_t len; /* length, host order, 24 bits */ + uint32_t sid; /* stream id, host order, 31 bits */ + uint8_t ft; /* frame type */ + uint8_t ff; /* frame flags */ +}; + +/* trace source and events */ +static void h2_trace(enum trace_level level, uint64_t mask, \ + const struct trace_source *src, + const struct ist where, const struct ist func, + const void *a1, const void *a2, const void *a3, const void *a4); + +/* The event representation is split like this : + * strm - application layer + * h2s - internal H2 stream + * h2c - internal H2 connection + * conn - external connection + * + */ +static const struct trace_event h2_trace_events[] = { +#define H2_EV_H2C_NEW (1ULL << 0) + { .mask = H2_EV_H2C_NEW, .name = "h2c_new", .desc = "new H2 connection" }, +#define H2_EV_H2C_RECV (1ULL << 1) + { .mask = H2_EV_H2C_RECV, .name = "h2c_recv", .desc = "Rx on H2 connection" }, +#define H2_EV_H2C_SEND (1ULL << 2) + { .mask = H2_EV_H2C_SEND, .name = "h2c_send", .desc = "Tx on H2 connection" }, +#define H2_EV_H2C_FCTL (1ULL << 3) + { .mask = H2_EV_H2C_FCTL, .name = "h2c_fctl", .desc = "H2 connection flow-controlled" }, +#define H2_EV_H2C_BLK (1ULL << 4) + { .mask = H2_EV_H2C_BLK, .name = "h2c_blk", .desc = "H2 connection blocked" }, +#define H2_EV_H2C_WAKE (1ULL << 5) + { .mask = H2_EV_H2C_WAKE, .name = "h2c_wake", .desc = "H2 connection woken up" }, +#define H2_EV_H2C_END (1ULL << 6) + { .mask = H2_EV_H2C_END, .name = "h2c_end", .desc = "H2 connection terminated" }, +#define H2_EV_H2C_ERR (1ULL << 7) + { .mask = H2_EV_H2C_ERR, .name = "h2c_err", .desc = "error on H2 connection" }, +#define H2_EV_RX_FHDR (1ULL << 8) + { .mask = H2_EV_RX_FHDR, .name = "rx_fhdr", .desc = "H2 frame header received" }, +#define H2_EV_RX_FRAME (1ULL << 9) + { .mask = H2_EV_RX_FRAME, .name = "rx_frame", .desc = "receipt of any H2 frame" }, +#define H2_EV_RX_EOI (1ULL << 10) + { .mask = H2_EV_RX_EOI, .name = "rx_eoi", .desc = "receipt of end of H2 input (ES or RST)" }, +#define H2_EV_RX_PREFACE (1ULL << 11) + { .mask = H2_EV_RX_PREFACE, .name = "rx_preface", .desc = "receipt of H2 preface" }, +#define H2_EV_RX_DATA (1ULL << 12) + { .mask = H2_EV_RX_DATA, .name = "rx_data", .desc = "receipt of H2 DATA frame" }, +#define H2_EV_RX_HDR (1ULL << 13) + { .mask = H2_EV_RX_HDR, .name = "rx_hdr", .desc = "receipt of H2 HEADERS frame" }, +#define H2_EV_RX_PRIO (1ULL << 14) + { .mask = H2_EV_RX_PRIO, .name = "rx_prio", .desc = "receipt of H2 PRIORITY frame" }, +#define H2_EV_RX_RST (1ULL << 15) + { .mask = H2_EV_RX_RST, .name = "rx_rst", .desc = "receipt of H2 RST_STREAM frame" }, +#define H2_EV_RX_SETTINGS (1ULL << 16) + { .mask = H2_EV_RX_SETTINGS, .name = "rx_settings", .desc = "receipt of H2 SETTINGS frame" }, +#define H2_EV_RX_PUSH (1ULL << 17) + { .mask = H2_EV_RX_PUSH, .name = "rx_push", .desc = "receipt of H2 PUSH_PROMISE frame" }, +#define H2_EV_RX_PING (1ULL << 18) + { .mask = H2_EV_RX_PING, .name = "rx_ping", .desc = "receipt of H2 PING frame" }, +#define H2_EV_RX_GOAWAY (1ULL << 19) + { .mask = H2_EV_RX_GOAWAY, .name = "rx_goaway", .desc = "receipt of H2 GOAWAY frame" }, +#define H2_EV_RX_WU (1ULL << 20) + { .mask = H2_EV_RX_WU, .name = "rx_wu", .desc = "receipt of H2 WINDOW_UPDATE frame" }, +#define H2_EV_RX_CONT (1ULL << 21) + { .mask = H2_EV_RX_CONT, .name = "rx_cont", .desc = "receipt of H2 CONTINUATION frame" }, +#define H2_EV_TX_FRAME (1ULL << 22) + { .mask = H2_EV_TX_FRAME, .name = "tx_frame", .desc = "transmission of any H2 frame" }, +#define H2_EV_TX_EOI (1ULL << 23) + { .mask = H2_EV_TX_EOI, .name = "tx_eoi", .desc = "transmission of H2 end of input (ES or RST)" }, +#define H2_EV_TX_PREFACE (1ULL << 24) + { .mask = H2_EV_TX_PREFACE, .name = "tx_preface", .desc = "transmission of H2 preface" }, +#define H2_EV_TX_DATA (1ULL << 25) + { .mask = H2_EV_TX_DATA, .name = "tx_data", .desc = "transmission of H2 DATA frame" }, +#define H2_EV_TX_HDR (1ULL << 26) + { .mask = H2_EV_TX_HDR, .name = "tx_hdr", .desc = "transmission of H2 HEADERS frame" }, +#define H2_EV_TX_PRIO (1ULL << 27) + { .mask = H2_EV_TX_PRIO, .name = "tx_prio", .desc = "transmission of H2 PRIORITY frame" }, +#define H2_EV_TX_RST (1ULL << 28) + { .mask = H2_EV_TX_RST, .name = "tx_rst", .desc = "transmission of H2 RST_STREAM frame" }, +#define H2_EV_TX_SETTINGS (1ULL << 29) + { .mask = H2_EV_TX_SETTINGS, .name = "tx_settings", .desc = "transmission of H2 SETTINGS frame" }, +#define H2_EV_TX_PUSH (1ULL << 30) + { .mask = H2_EV_TX_PUSH, .name = "tx_push", .desc = "transmission of H2 PUSH_PROMISE frame" }, +#define H2_EV_TX_PING (1ULL << 31) + { .mask = H2_EV_TX_PING, .name = "tx_ping", .desc = "transmission of H2 PING frame" }, +#define H2_EV_TX_GOAWAY (1ULL << 32) + { .mask = H2_EV_TX_GOAWAY, .name = "tx_goaway", .desc = "transmission of H2 GOAWAY frame" }, +#define H2_EV_TX_WU (1ULL << 33) + { .mask = H2_EV_TX_WU, .name = "tx_wu", .desc = "transmission of H2 WINDOW_UPDATE frame" }, +#define H2_EV_TX_CONT (1ULL << 34) + { .mask = H2_EV_TX_CONT, .name = "tx_cont", .desc = "transmission of H2 CONTINUATION frame" }, +#define H2_EV_H2S_NEW (1ULL << 35) + { .mask = H2_EV_H2S_NEW, .name = "h2s_new", .desc = "new H2 stream" }, +#define H2_EV_H2S_RECV (1ULL << 36) + { .mask = H2_EV_H2S_RECV, .name = "h2s_recv", .desc = "Rx for H2 stream" }, +#define H2_EV_H2S_SEND (1ULL << 37) + { .mask = H2_EV_H2S_SEND, .name = "h2s_send", .desc = "Tx for H2 stream" }, +#define H2_EV_H2S_FCTL (1ULL << 38) + { .mask = H2_EV_H2S_FCTL, .name = "h2s_fctl", .desc = "H2 stream flow-controlled" }, +#define H2_EV_H2S_BLK (1ULL << 39) + { .mask = H2_EV_H2S_BLK, .name = "h2s_blk", .desc = "H2 stream blocked" }, +#define H2_EV_H2S_WAKE (1ULL << 40) + { .mask = H2_EV_H2S_WAKE, .name = "h2s_wake", .desc = "H2 stream woken up" }, +#define H2_EV_H2S_END (1ULL << 41) + { .mask = H2_EV_H2S_END, .name = "h2s_end", .desc = "H2 stream terminated" }, +#define H2_EV_H2S_ERR (1ULL << 42) + { .mask = H2_EV_H2S_ERR, .name = "h2s_err", .desc = "error on H2 stream" }, +#define H2_EV_STRM_NEW (1ULL << 43) + { .mask = H2_EV_STRM_NEW, .name = "strm_new", .desc = "app-layer stream creation" }, +#define H2_EV_STRM_RECV (1ULL << 44) + { .mask = H2_EV_STRM_RECV, .name = "strm_recv", .desc = "receiving data for stream" }, +#define H2_EV_STRM_SEND (1ULL << 45) + { .mask = H2_EV_STRM_SEND, .name = "strm_send", .desc = "sending data for stream" }, +#define H2_EV_STRM_FULL (1ULL << 46) + { .mask = H2_EV_STRM_FULL, .name = "strm_full", .desc = "stream buffer full" }, +#define H2_EV_STRM_WAKE (1ULL << 47) + { .mask = H2_EV_STRM_WAKE, .name = "strm_wake", .desc = "stream woken up" }, +#define H2_EV_STRM_SHUT (1ULL << 48) + { .mask = H2_EV_STRM_SHUT, .name = "strm_shut", .desc = "stream shutdown" }, +#define H2_EV_STRM_END (1ULL << 49) + { .mask = H2_EV_STRM_END, .name = "strm_end", .desc = "detaching app-layer stream" }, +#define H2_EV_STRM_ERR (1ULL << 50) + { .mask = H2_EV_STRM_ERR, .name = "strm_err", .desc = "stream error" }, +#define H2_EV_PROTO_ERR (1ULL << 51) + { .mask = H2_EV_PROTO_ERR, .name = "proto_err", .desc = "protocol error" }, + { } +}; + +static const struct name_desc h2_trace_lockon_args[4] = { + /* arg1 */ { /* already used by the connection */ }, + /* arg2 */ { .name="h2s", .desc="H2 stream" }, + /* arg3 */ { }, + /* arg4 */ { } +}; + +static const struct name_desc h2_trace_decoding[] = { +#define H2_VERB_CLEAN 1 + { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" }, +#define H2_VERB_MINIMAL 2 + { .name="minimal", .desc="report only h2c/h2s state and flags, no real decoding" }, +#define H2_VERB_SIMPLE 3 + { .name="simple", .desc="add request/response status line or frame info when available" }, +#define H2_VERB_ADVANCED 4 + { .name="advanced", .desc="add header fields or frame decoding when available" }, +#define H2_VERB_COMPLETE 5 + { .name="complete", .desc="add full data dump when available" }, + { /* end */ } +}; + +static struct trace_source trace_h2 __read_mostly = { + .name = IST("h2"), + .desc = "HTTP/2 multiplexer", + .arg_def = TRC_ARG1_CONN, // TRACE()'s first argument is always a connection + .default_cb = h2_trace, + .known_events = h2_trace_events, + .lockon_args = h2_trace_lockon_args, + .decoding = h2_trace_decoding, + .report_events = ~0, // report everything by default +}; + +#define TRACE_SOURCE &trace_h2 +INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE); + +/* h2 stats module */ +enum { + H2_ST_HEADERS_RCVD, + H2_ST_DATA_RCVD, + H2_ST_SETTINGS_RCVD, + H2_ST_RST_STREAM_RCVD, + H2_ST_GOAWAY_RCVD, + + H2_ST_CONN_PROTO_ERR, + H2_ST_STRM_PROTO_ERR, + H2_ST_RST_STREAM_RESP, + H2_ST_GOAWAY_RESP, + + H2_ST_OPEN_CONN, + H2_ST_OPEN_STREAM, + H2_ST_TOTAL_CONN, + H2_ST_TOTAL_STREAM, + + H2_STATS_COUNT /* must be the last member of the enum */ +}; + +static struct name_desc h2_stats[] = { + [H2_ST_HEADERS_RCVD] = { .name = "h2_headers_rcvd", + .desc = "Total number of received HEADERS frames" }, + [H2_ST_DATA_RCVD] = { .name = "h2_data_rcvd", + .desc = "Total number of received DATA frames" }, + [H2_ST_SETTINGS_RCVD] = { .name = "h2_settings_rcvd", + .desc = "Total number of received SETTINGS frames" }, + [H2_ST_RST_STREAM_RCVD] = { .name = "h2_rst_stream_rcvd", + .desc = "Total number of received RST_STREAM frames" }, + [H2_ST_GOAWAY_RCVD] = { .name = "h2_goaway_rcvd", + .desc = "Total number of received GOAWAY frames" }, + + [H2_ST_CONN_PROTO_ERR] = { .name = "h2_detected_conn_protocol_errors", + .desc = "Total number of connection protocol errors" }, + [H2_ST_STRM_PROTO_ERR] = { .name = "h2_detected_strm_protocol_errors", + .desc = "Total number of stream protocol errors" }, + [H2_ST_RST_STREAM_RESP] = { .name = "h2_rst_stream_resp", + .desc = "Total number of RST_STREAM sent on detected error" }, + [H2_ST_GOAWAY_RESP] = { .name = "h2_goaway_resp", + .desc = "Total number of GOAWAY sent on detected error" }, + + [H2_ST_OPEN_CONN] = { .name = "h2_open_connections", + .desc = "Count of currently open connections" }, + [H2_ST_OPEN_STREAM] = { .name = "h2_backend_open_streams", + .desc = "Count of currently open streams" }, + [H2_ST_TOTAL_CONN] = { .name = "h2_total_connections", + .desc = "Total number of connections" }, + [H2_ST_TOTAL_STREAM] = { .name = "h2_backend_total_streams", + .desc = "Total number of streams" }, +}; + +static struct h2_counters { + long long headers_rcvd; /* total number of HEADERS frame received */ + long long data_rcvd; /* total number of DATA frame received */ + long long settings_rcvd; /* total number of SETTINGS frame received */ + long long rst_stream_rcvd; /* total number of RST_STREAM frame received */ + long long goaway_rcvd; /* total number of GOAWAY frame received */ + + long long conn_proto_err; /* total number of protocol errors detected */ + long long strm_proto_err; /* total number of protocol errors detected */ + long long rst_stream_resp; /* total number of RST_STREAM frame sent on error */ + long long goaway_resp; /* total number of GOAWAY frame sent on error */ + + long long open_conns; /* count of currently open connections */ + long long open_streams; /* count of currently open streams */ + long long total_conns; /* total number of connections */ + long long total_streams; /* total number of streams */ +} h2_counters; + +static void h2_fill_stats(void *data, struct field *stats) +{ + struct h2_counters *counters = data; + + stats[H2_ST_HEADERS_RCVD] = mkf_u64(FN_COUNTER, counters->headers_rcvd); + stats[H2_ST_DATA_RCVD] = mkf_u64(FN_COUNTER, counters->data_rcvd); + stats[H2_ST_SETTINGS_RCVD] = mkf_u64(FN_COUNTER, counters->settings_rcvd); + stats[H2_ST_RST_STREAM_RCVD] = mkf_u64(FN_COUNTER, counters->rst_stream_rcvd); + stats[H2_ST_GOAWAY_RCVD] = mkf_u64(FN_COUNTER, counters->goaway_rcvd); + + stats[H2_ST_CONN_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->conn_proto_err); + stats[H2_ST_STRM_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->strm_proto_err); + stats[H2_ST_RST_STREAM_RESP] = mkf_u64(FN_COUNTER, counters->rst_stream_resp); + stats[H2_ST_GOAWAY_RESP] = mkf_u64(FN_COUNTER, counters->goaway_resp); + + stats[H2_ST_OPEN_CONN] = mkf_u64(FN_GAUGE, counters->open_conns); + stats[H2_ST_OPEN_STREAM] = mkf_u64(FN_GAUGE, counters->open_streams); + stats[H2_ST_TOTAL_CONN] = mkf_u64(FN_COUNTER, counters->total_conns); + stats[H2_ST_TOTAL_STREAM] = mkf_u64(FN_COUNTER, counters->total_streams); +} + +static struct stats_module h2_stats_module = { + .name = "h2", + .fill_stats = h2_fill_stats, + .stats = h2_stats, + .stats_count = H2_STATS_COUNT, + .counters = &h2_counters, + .counters_size = sizeof(h2_counters), + .domain_flags = MK_STATS_PROXY_DOMAIN(STATS_PX_CAP_FE|STATS_PX_CAP_BE), + .clearable = 1, +}; + +INITCALL1(STG_REGISTER, stats_register_module, &h2_stats_module); + +/* the h2c connection pool */ +DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c)); + +/* the h2s stream pool */ +DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s)); + +/* The default connection window size is 65535, it may only be enlarged using + * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1, + * we'll pretend we already received the difference between the two to send + * an equivalent window update to enlarge it to 2G-1. + */ +#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535) + +/* maximum amount of data we're OK with re-aligning for buffer optimizations */ +#define MAX_DATA_REALIGN 1024 + +/* a few settings from the global section */ +static int h2_settings_header_table_size = 4096; /* initial value */ +static int h2_settings_initial_window_size = 65536; /* default initial value */ +static int h2_be_settings_initial_window_size = 0; /* backend's default initial value */ +static int h2_fe_settings_initial_window_size = 0; /* frontend's default initial value */ +static unsigned int h2_settings_max_concurrent_streams = 100; /* default value */ +static unsigned int h2_be_settings_max_concurrent_streams = 0; /* backend value */ +static unsigned int h2_fe_settings_max_concurrent_streams = 0; /* frontend value */ +static int h2_settings_max_frame_size = 0; /* unset */ + +/* other non-protocol settings */ +static unsigned int h2_fe_max_total_streams = 0; /* frontend value */ + +/* a dummy closed endpoint */ +static const struct sedesc closed_ep = { + .sc = NULL, + .flags = SE_FL_DETACHED, +}; + +/* a dmumy closed stream */ +static const struct h2s *h2_closed_stream = &(const struct h2s){ + .sd = (struct sedesc *)&closed_ep, + .h2c = NULL, + .st = H2_SS_CLOSED, + .errcode = H2_ERR_STREAM_CLOSED, + .flags = H2_SF_RST_RCVD, + .id = 0, +}; + +/* a dmumy closed stream returning a PROTOCOL_ERROR error */ +static const struct h2s *h2_error_stream = &(const struct h2s){ + .sd = (struct sedesc *)&closed_ep, + .h2c = NULL, + .st = H2_SS_CLOSED, + .errcode = H2_ERR_PROTOCOL_ERROR, + .flags = 0, + .id = 0, +}; + +/* a dmumy closed stream returning a REFUSED_STREAM error */ +static const struct h2s *h2_refused_stream = &(const struct h2s){ + .sd = (struct sedesc *)&closed_ep, + .h2c = NULL, + .st = H2_SS_CLOSED, + .errcode = H2_ERR_REFUSED_STREAM, + .flags = 0, + .id = 0, +}; + +/* and a dummy idle stream for use with any unannounced stream */ +static const struct h2s *h2_idle_stream = &(const struct h2s){ + .sd = (struct sedesc *)&closed_ep, + .h2c = NULL, + .st = H2_SS_IDLE, + .errcode = H2_ERR_STREAM_CLOSED, + .id = 0, +}; + + +struct task *h2_timeout_task(struct task *t, void *context, unsigned int state); +static int h2_send(struct h2c *h2c); +static int h2_recv(struct h2c *h2c); +static int h2_process(struct h2c *h2c); +/* h2_io_cb is exported to see it resolved in "show fd" */ +struct task *h2_io_cb(struct task *t, void *ctx, unsigned int state); +static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id); +static int h2c_dec_hdrs(struct h2c *h2c, struct buffer *rxbuf, uint32_t *flags, unsigned long long *body_len, char *upgrade_protocol); +static int h2_frt_transfer_data(struct h2s *h2s); +struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned int state); +static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct stconn *sc, struct session *sess); +static void h2s_alert(struct h2s *h2s); +static inline void h2_remove_from_list(struct h2s *h2s); + +/* returns the stconn associated to the H2 stream */ +static forceinline struct stconn *h2s_sc(const struct h2s *h2s) +{ + return h2s->sd->sc; +} + +/* the H2 traces always expect that arg1, if non-null, is of type connection + * (from which we can derive h2c), that arg2, if non-null, is of type h2s, and + * that arg3, if non-null, is either of type htx for tx headers, or of type + * buffer for everything else. + */ +static void h2_trace(enum trace_level level, uint64_t mask, const struct trace_source *src, + const struct ist where, const struct ist func, + const void *a1, const void *a2, const void *a3, const void *a4) +{ + const struct connection *conn = a1; + const struct h2c *h2c = conn ? conn->ctx : NULL; + const struct h2s *h2s = a2; + const struct buffer *buf = a3; + const struct htx *htx; + int pos; + + if (!h2c) // nothing to add + return; + + if (src->verbosity > H2_VERB_CLEAN) { + chunk_appendf(&trace_buf, " : h2c=%p(%c,%s)", h2c, conn_is_back(conn) ? 'B' : 'F', h2c_st_to_str(h2c->st0)); + + if (mask & H2_EV_H2C_NEW) // inside h2_init, otherwise it's hard to match conn & h2c + conn_append_debug_info(&trace_buf, conn, " : "); + + if (h2c->errcode) + chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2c->errcode), h2c->errcode); + + if (h2c->flags & H2_CF_DEM_IN_PROGRESS && // frame processing has started, type and length are valid + (mask & (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) == (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) { + chunk_appendf(&trace_buf, " dft=%s/%02x dfl=%d", h2_ft_str(h2c->dft), h2c->dff, h2c->dfl); + } + + if (h2s) { + if (h2s->id <= 0) + chunk_appendf(&trace_buf, " dsi=%d", h2c->dsi); + if (h2s == h2_idle_stream) + chunk_appendf(&trace_buf, " h2s=IDL"); + else if (h2s != h2_closed_stream && h2s != h2_refused_stream && h2s != h2_error_stream) + chunk_appendf(&trace_buf, " h2s=%p(%d,%s)", h2s, h2s->id, h2s_st_to_str(h2s->st)); + else if (h2c->dsi > 0) // don't show that before sid is known + chunk_appendf(&trace_buf, " h2s=CLO"); + if (h2s->id && h2s->errcode) + chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2s->errcode), h2s->errcode); + } + } + + /* Let's dump decoded requests and responses right after parsing. They + * are traced at level USER with a few recognizable flags. + */ + if ((mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW) || + mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR)) && buf) + htx = htxbuf(buf); // recv req/res + else if (mask == (H2_EV_TX_FRAME|H2_EV_TX_HDR)) + htx = a3; // send req/res + else + htx = NULL; + + if (level == TRACE_LEVEL_USER && src->verbosity != H2_VERB_MINIMAL && htx && (pos = htx_get_head(htx)) != -1) { + const struct htx_blk *blk = htx_get_blk(htx, pos); + const struct htx_sl *sl = htx_get_blk_ptr(htx, blk); + enum htx_blk_type type = htx_get_blk_type(blk); + + if (type == HTX_BLK_REQ_SL) + chunk_appendf(&trace_buf, " : [%d] H2 REQ: %.*s %.*s %.*s", + h2s ? h2s->id : h2c->dsi, + HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl), + HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl), + HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl)); + else if (type == HTX_BLK_RES_SL) + chunk_appendf(&trace_buf, " : [%d] H2 RES: %.*s %.*s %.*s", + h2s ? h2s->id : h2c->dsi, + HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl), + HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl), + HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl)); + } +} + + +/* Detect a pending read0 for a H2 connection. It happens if a read0 was + * already reported on a previous xprt->rcvbuf() AND a frame parser failed + * to parse pending data, confirming no more progress is possible because + * we're facing a truncated frame. The function returns 1 to report a read0 + * or 0 otherwise. + */ +static inline int h2c_read0_pending(struct h2c *h2c) +{ + return !!(h2c->flags & H2_CF_END_REACHED); +} + +/* returns true if the connection is allowed to expire, false otherwise. A + * connection may expire when it has no attached streams. As long as streams + * are attached, the application layer is responsible for timeout management, + * and each layer will detach when it doesn't want to wait anymore. When the + * last one leaves, the connection must take over timeout management. + */ +static inline int h2c_may_expire(const struct h2c *h2c) +{ + return !h2c->nb_sc; +} + +/* returns the number of max concurrent streams permitted on a connection, + * depending on its side (frontend or backend), falling back to the default + * h2_settings_max_concurrent_streams. It may even be zero. + */ +static inline int h2c_max_concurrent_streams(const struct h2c *h2c) +{ + int ret; + + ret = (h2c->flags & H2_CF_IS_BACK) ? + h2_be_settings_max_concurrent_streams : + h2_fe_settings_max_concurrent_streams; + + ret = ret ? ret : h2_settings_max_concurrent_streams; + return ret; +} + + +/* update h2c timeout if needed */ +static void h2c_update_timeout(struct h2c *h2c) +{ + int is_idle_conn = 0; + + TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn); + + if (!h2c->task) + goto leave; + + if (h2c_may_expire(h2c)) { + /* no more streams attached */ + if (br_data(h2c->mbuf)) { + /* pending output data: always the regular data timeout */ + h2c->task->expire = tick_add_ifset(now_ms, h2c->timeout); + } else { + /* no stream, no output data */ + if (!(h2c->flags & H2_CF_IS_BACK)) { + int to; + + if (h2c->max_id > 0 && !b_data(&h2c->dbuf) && + tick_isset(h2c->proxy->timeout.httpka)) { + /* idle after having seen one stream => keep-alive */ + to = h2c->proxy->timeout.httpka; + } else { + /* before first request, or started to deserialize a + * new req => http-request. + */ + to = h2c->proxy->timeout.httpreq; + } + + h2c->task->expire = tick_add_ifset(h2c->idle_start, to); + is_idle_conn = 1; + } + + if (h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED)) { + /* GOAWAY sent (or failed), closing in progress */ + int exp = tick_add_ifset(now_ms, h2c->shut_timeout); + + h2c->task->expire = tick_first(h2c->task->expire, exp); + is_idle_conn = 1; + } + + /* if a timeout above was not set, fall back to the default one */ + if (!tick_isset(h2c->task->expire)) + h2c->task->expire = tick_add_ifset(now_ms, h2c->timeout); + } + + if ((h2c->proxy->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) && + is_idle_conn && tick_isset(global.close_spread_end)) { + /* If a soft-stop is in progress and a close-spread-time + * is set, we want to spread idle connection closing roughly + * evenly across the defined window. This should only + * act on idle frontend connections. + * If the window end is already in the past, we wake the + * timeout task up immediately so that it can be closed. + */ + int remaining_window = tick_remain(now_ms, global.close_spread_end); + if (remaining_window) { + /* We don't need to reset the expire if it would + * already happen before the close window end. + */ + if (tick_isset(h2c->task->expire) && + tick_is_le(global.close_spread_end, h2c->task->expire)) { + /* Set an expire value shorter than the current value + * because the close spread window end comes earlier. + */ + h2c->task->expire = tick_add(now_ms, statistical_prng_range(remaining_window)); + } + } + else { + /* We are past the soft close window end, wake the timeout + * task up immediately. + */ + task_wakeup(h2c->task, TASK_WOKEN_TIMER); + } + } + + } else { + h2c->task->expire = TICK_ETERNITY; + } + task_queue(h2c->task); + leave: + TRACE_LEAVE(H2_EV_H2C_WAKE); +} + +static __inline int +h2c_is_dead(const struct h2c *h2c) +{ + if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */ + ((h2c->flags & H2_CF_ERROR) || /* errors close immediately */ + (h2c->flags & H2_CF_ERR_PENDING && h2c->st0 < H2_CS_FRAME_H) || /* early error during connect */ + (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */ + (!(h2c->conn->owner) && !conn_is_reverse(h2c->conn)) || /* Nobody's left to take care of the connection, drop it now */ + (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */ + ((h2c->flags & H2_CF_RCVD_SHUT) || + (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid))))) + return 1; + + return 0; +} + +/*****************************************************/ +/* functions below are for dynamic buffer management */ +/*****************************************************/ + +/* indicates whether or not the we may call the h2_recv() function to attempt + * to receive data into the buffer and/or demux pending data. The condition is + * a bit complex due to some API limits for now. The rules are the following : + * - if an error or a shutdown was detected on the connection and the buffer + * is empty, we must not attempt to receive + * - if the demux buf failed to be allocated, we must not try to receive and + * we know there is nothing pending + * - if no flag indicates a blocking condition, we may attempt to receive, + * regardless of whether the demux buffer is full or not, so that only + * de demux part decides whether or not to block. This is needed because + * the connection API indeed prevents us from re-enabling receipt that is + * already enabled in a polled state, so we must always immediately stop + * as soon as the demux can't proceed so as never to hit an end of read + * with data pending in the buffers. + * - otherwise must may not attempt + */ +static inline int h2_recv_allowed(const struct h2c *h2c) +{ + if (b_data(&h2c->dbuf) == 0 && + ((h2c->flags & (H2_CF_RCVD_SHUT|H2_CF_ERROR)) || h2c->st0 >= H2_CS_ERROR)) + return 0; + + if (!(h2c->flags & H2_CF_DEM_DALLOC) && + !(h2c->flags & H2_CF_DEM_BLOCK_ANY)) + return 1; + + return 0; +} + +/* restarts reading on the connection if it was not enabled */ +static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer) +{ + if (!h2_recv_allowed(h2c)) + return; + if ((!consider_buffer || !b_data(&h2c->dbuf)) + && (h2c->wait_event.events & SUB_RETRY_RECV)) + return; + tasklet_wakeup(h2c->wait_event.tasklet); +} + + +/* returns true if the front connection has too many stream connectors attached */ +static inline int h2_frt_has_too_many_sc(const struct h2c *h2c) +{ + return h2c->nb_sc > h2c_max_concurrent_streams(h2c) || + unlikely(conn_reverse_in_preconnect(h2c->conn)); +} + +/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c + * flags are used to figure what buffer was requested. It returns 1 if the + * allocation succeeds, in which case the connection is woken up, or 0 if it's + * impossible to wake up and we prefer to be woken up later. + */ +static int h2_buf_available(void *target) +{ + struct h2c *h2c = target; + struct h2s *h2s; + + if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc(&h2c->dbuf)) { + h2c->flags &= ~H2_CF_DEM_DALLOC; + h2c_restart_reading(h2c, 1); + return 1; + } + + if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc(br_tail(h2c->mbuf))) { + h2c->flags &= ~H2_CF_MUX_MALLOC; + + if (h2c->flags & H2_CF_DEM_MROOM) { + h2c->flags &= ~H2_CF_DEM_MROOM; + h2c_restart_reading(h2c, 1); + } + return 1; + } + + if ((h2c->flags & H2_CF_DEM_SALLOC) && + (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s_sc(h2s) && + b_alloc(&h2s->rxbuf)) { + h2c->flags &= ~H2_CF_DEM_SALLOC; + h2c_restart_reading(h2c, 1); + return 1; + } + + return 0; +} + +static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr) +{ + struct buffer *buf = NULL; + + if (likely(!LIST_INLIST(&h2c->buf_wait.list)) && + unlikely((buf = b_alloc(bptr)) == NULL)) { + h2c->buf_wait.target = h2c; + h2c->buf_wait.wakeup_cb = h2_buf_available; + LIST_APPEND(&th_ctx->buffer_wq, &h2c->buf_wait.list); + } + return buf; +} + +static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr) +{ + if (bptr->size) { + b_free(bptr); + offer_buffers(NULL, 1); + } +} + +static inline void h2_release_mbuf(struct h2c *h2c) +{ + struct buffer *buf; + unsigned int count = 0; + + while (b_size(buf = br_head_pick(h2c->mbuf))) { + b_free(buf); + count++; + } + if (count) + offer_buffers(NULL, count); +} + +/* returns the number of allocatable outgoing streams for the connection taking + * the last_sid and the reserved ones into account. + */ +static inline int h2_streams_left(const struct h2c *h2c) +{ + int ret; + + /* consider the number of outgoing streams we're allowed to create before + * reaching the last GOAWAY frame seen. max_id is the last assigned id, + * nb_reserved is the number of streams which don't yet have an ID. + */ + ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF; + ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1; + if (ret < 0) + ret = 0; + return ret; +} + +/* returns the number of streams in use on a connection to figure if it's + * idle or not. We check nb_sc and not nb_streams as the caller will want + * to know if it was the last one after a detach(). + */ +static int h2_used_streams(struct connection *conn) +{ + struct h2c *h2c = conn->ctx; + + return h2c->nb_sc; +} + +/* returns the number of concurrent streams available on the connection */ +static int h2_avail_streams(struct connection *conn) +{ + struct server *srv = objt_server(conn->target); + struct h2c *h2c = conn->ctx; + int ret1, ret2; + + /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional + * streams on the connection. + */ + if (h2c->last_sid >= 0) + return 0; + + if (h2c->st0 >= H2_CS_ERROR) + return 0; + + /* note: may be negative if a SETTINGS frame changes the limit */ + ret1 = h2c->streams_limit - h2c->nb_streams; + + /* we must also consider the limit imposed by stream IDs */ + ret2 = h2_streams_left(h2c); + ret1 = MIN(ret1, ret2); + if (ret1 > 0 && srv && srv->max_reuse >= 0) { + ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0; + ret1 = MIN(ret1, ret2); + } + return ret1; +} + +/* Unconditionally produce a trace of the header. Please do not call this one + * and use h2_trace_header() instead which first checks if traces are enabled. + */ +void _h2_trace_header(const struct ist hn, const struct ist hv, + uint64_t mask, const struct ist trc_loc, const char *func, + const struct h2c *h2c, const struct h2s *h2s) +{ + struct ist n_ist, v_ist; + const char *c_str, *s_str; + + chunk_reset(&trash); + c_str = chunk_newstr(&trash); + if (h2c) { + chunk_appendf(&trash, "h2c=%p(%c,%s) ", + h2c, (h2c->flags & H2_CF_IS_BACK) ? 'B' : 'F', h2c_st_to_str(h2c->st0)); + } + + s_str = chunk_newstr(&trash); + if (h2s) { + if (h2s->id <= 0) + chunk_appendf(&trash, "dsi=%d ", h2s->h2c->dsi); + chunk_appendf(&trash, "h2s=%p(%d,%s) ", h2s, h2s->id, h2s_st_to_str(h2s->st)); + } + else if (h2c) + chunk_appendf(&trash, "dsi=%d ", h2c->dsi); + + n_ist = ist2(chunk_newstr(&trash), 0); + istscpy(&n_ist, hn, 256); + trash.data += n_ist.len; + if (n_ist.len != hn.len) + chunk_appendf(&trash, " (... +%ld)", (long)(hn.len - n_ist.len)); + + v_ist = ist2(chunk_newstr(&trash), 0); + istscpy(&v_ist, hv, 1024); + trash.data += v_ist.len; + if (v_ist.len != hv.len) + chunk_appendf(&trash, " (... +%ld)", (long)(hv.len - v_ist.len)); + + TRACE_PRINTF_LOC(TRACE_LEVEL_USER, mask, trc_loc, func, + (h2c ? h2c->conn : 0), 0, 0, 0, + "%s%s%s %s: %s", c_str, s_str, + (mask & H2_EV_TX_HDR) ? "sndh" : "rcvh", + n_ist.ptr, v_ist.ptr); +} + +/* produce a trace of the header after checking that tracing is enabled */ +static inline void h2_trace_header(const struct ist hn, const struct ist hv, + uint64_t mask, const struct ist trc_loc, const char *func, + const struct h2c *h2c, const struct h2s *h2s) +{ + if ((TRACE_SOURCE)->verbosity >= H2_VERB_ADVANCED && + TRACE_ENABLED(TRACE_LEVEL_USER, mask, h2c ? h2c->conn : 0, h2s, 0, 0)) + _h2_trace_header(hn, hv, mask, trc_loc, func, h2c, h2s); +} + +/* hpack-encode header name <hn> and value <hv>, possibly emitting a trace if + * currently enabled. This is done on behalf of function <func> at <trc_loc> + * passed as ist(TRC_LOC), h2c <h2c>, and h2s <h2s>, all of which may be NULL. + * The trace is only emitted if the header is emitted (in which case non-zero + * is returned). The trash is modified. In the traces, the header's name will + * be truncated to 256 chars and the header's value to 1024 chars. + */ +static inline int h2_encode_header(struct buffer *buf, const struct ist hn, const struct ist hv, + uint64_t mask, const struct ist trc_loc, const char *func, + const struct h2c *h2c, const struct h2s *h2s) +{ + int ret; + + ret = hpack_encode_header(buf, hn, hv); + if (ret) + h2_trace_header(hn, hv, mask, trc_loc, func, h2c, h2s); + + return ret; +} + +/*****************************************************************/ +/* functions below are dedicated to the mux setup and management */ +/*****************************************************************/ + +/* Initialize the mux once it's attached. For outgoing connections, the context + * is already initialized before installing the mux, so we detect incoming + * connections from the fact that the context is still NULL (even during mux + * upgrades). <input> is always used as Input buffer and may contain data. It is + * the caller responsibility to not reuse it anymore. Returns < 0 on error. + */ +static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess, + struct buffer *input) +{ + struct h2c *h2c; + struct task *t = NULL; + void *conn_ctx = conn->ctx; + + TRACE_ENTER(H2_EV_H2C_NEW); + + h2c = pool_alloc(pool_head_h2c); + if (!h2c) + goto fail_no_h2c; + + if (conn_is_back(conn)) { + h2c->flags = H2_CF_IS_BACK; + h2c->shut_timeout = h2c->timeout = prx->timeout.server; + if (tick_isset(prx->timeout.serverfin)) + h2c->shut_timeout = prx->timeout.serverfin; + + h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_be, + &h2_stats_module); + } else { + h2c->flags = H2_CF_NONE; + h2c->shut_timeout = h2c->timeout = prx->timeout.client; + if (tick_isset(prx->timeout.clientfin)) + h2c->shut_timeout = prx->timeout.clientfin; + + h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_fe, + &h2_stats_module); + } + + h2c->proxy = prx; + h2c->task = NULL; + h2c->wait_event.tasklet = NULL; + h2c->idle_start = now_ms; + if (tick_isset(h2c->timeout)) { + t = task_new_here(); + if (!t) + goto fail; + + h2c->task = t; + t->process = h2_timeout_task; + t->context = h2c; + t->expire = tick_add(now_ms, h2c->timeout); + } + + h2c->wait_event.tasklet = tasklet_new(); + if (!h2c->wait_event.tasklet) + goto fail; + h2c->wait_event.tasklet->process = h2_io_cb; + h2c->wait_event.tasklet->context = h2c; + h2c->wait_event.events = 0; + if (!conn_is_back(conn)) { + /* Connection might already be in the stopping_list if subject + * to h1->h2 upgrade. + */ + if (!LIST_INLIST(&conn->stopping_list)) { + LIST_APPEND(&mux_stopping_data[tid].list, + &conn->stopping_list); + } + } + + h2c->ddht = hpack_dht_alloc(); + if (!h2c->ddht) + goto fail; + + /* Initialise the context. */ + h2c->st0 = H2_CS_PREFACE; + h2c->conn = conn; + h2c->streams_limit = h2c_max_concurrent_streams(h2c); + h2c->max_id = -1; + h2c->errcode = H2_ERR_NO_ERROR; + h2c->rcvd_c = 0; + h2c->rcvd_s = 0; + h2c->nb_streams = 0; + h2c->nb_sc = 0; + h2c->nb_reserved = 0; + h2c->stream_cnt = 0; + + h2c->dbuf = *input; + h2c->dsi = -1; + + h2c->last_sid = -1; + + br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0])); + h2c->miw = 65535; /* mux initial window size */ + h2c->mws = 65535; /* mux window size */ + h2c->mfs = 16384; /* initial max frame size */ + h2c->streams_by_id = EB_ROOT; + LIST_INIT(&h2c->send_list); + LIST_INIT(&h2c->fctl_list); + LIST_INIT(&h2c->blocked_list); + LIST_INIT(&h2c->buf_wait.list); + + conn->ctx = h2c; + + TRACE_USER("new H2 connection", H2_EV_H2C_NEW, conn); + + if (t) + task_queue(t); + + if (h2c->flags & H2_CF_IS_BACK && likely(!conn_is_reverse(h2c->conn))) { + /* FIXME: this is temporary, for outgoing connections we need + * to immediately allocate a stream until the code is modified + * so that the caller calls ->attach(). For now the outgoing sc + * is stored as conn->ctx by the caller and saved in conn_ctx. + */ + struct h2s *h2s; + + h2s = h2c_bck_stream_new(h2c, conn_ctx, sess); + if (!h2s) + goto fail_stream; + } + + if (sess) + proxy_inc_fe_cum_sess_ver_ctr(sess->listener, prx, 2); + HA_ATOMIC_INC(&h2c->px_counters->open_conns); + HA_ATOMIC_INC(&h2c->px_counters->total_conns); + + /* prepare to read something */ + h2c_restart_reading(h2c, 1); + TRACE_LEAVE(H2_EV_H2C_NEW, conn); + return 0; + fail_stream: + hpack_dht_free(h2c->ddht); + fail: + task_destroy(t); + tasklet_free(h2c->wait_event.tasklet); + pool_free(pool_head_h2c, h2c); + fail_no_h2c: + if (!conn_is_back(conn)) + LIST_DEL_INIT(&conn->stopping_list); + conn->ctx = conn_ctx; /* restore saved ctx */ + TRACE_DEVEL("leaving in error", H2_EV_H2C_NEW|H2_EV_H2C_END|H2_EV_H2C_ERR); + return -1; +} + +/* returns the next allocatable outgoing stream ID for the H2 connection, or + * -1 if no more is allocatable. + */ +static inline int32_t h2c_get_next_sid(const struct h2c *h2c) +{ + int32_t id = (h2c->max_id + 1) | 1; + + if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid)) + id = -1; + return id; +} + +/* returns the stream associated with id <id> or NULL if not found */ +static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id) +{ + struct eb32_node *node; + + if (id == 0) + return (struct h2s *)h2_closed_stream; + + if (id > h2c->max_id) + return (struct h2s *)h2_idle_stream; + + node = eb32_lookup(&h2c->streams_by_id, id); + if (!node) + return (struct h2s *)h2_closed_stream; + + return container_of(node, struct h2s, by_id); +} + +/* release function. This one should be called to free all resources allocated + * to the mux. + */ +static void h2_release(struct h2c *h2c) +{ + struct connection *conn = h2c->conn; + + TRACE_ENTER(H2_EV_H2C_END); + + hpack_dht_free(h2c->ddht); + + if (LIST_INLIST(&h2c->buf_wait.list)) + LIST_DEL_INIT(&h2c->buf_wait.list); + + h2_release_buf(h2c, &h2c->dbuf); + h2_release_mbuf(h2c); + + if (h2c->task) { + h2c->task->context = NULL; + task_wakeup(h2c->task, TASK_WOKEN_OTHER); + h2c->task = NULL; + } + tasklet_free(h2c->wait_event.tasklet); + if (conn && h2c->wait_event.events != 0) + conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events, + &h2c->wait_event); + + HA_ATOMIC_DEC(&h2c->px_counters->open_conns); + + pool_free(pool_head_h2c, h2c); + + if (conn) { + if (!conn_is_back(conn)) + LIST_DEL_INIT(&conn->stopping_list); + + conn->mux = NULL; + conn->ctx = NULL; + TRACE_DEVEL("freeing conn", H2_EV_H2C_END, conn); + + conn_stop_tracking(conn); + + /* there might be a GOAWAY frame still pending in the TCP + * stack, and if the peer continues to send (i.e. window + * updates etc), this can result in losing the GOAWAY. For + * this reason we try to drain anything received in between. + */ + conn->flags |= CO_FL_WANT_DRAIN; + + conn_xprt_shutw(conn); + conn_xprt_close(conn); + conn_sock_shutw(conn, !conn_is_back(conn)); + conn_ctrl_close(conn); + + if (conn->destroy_cb) + conn->destroy_cb(conn); + conn_free(conn); + } + + TRACE_LEAVE(H2_EV_H2C_END); +} + + +/******************************************************/ +/* functions below are for the H2 protocol processing */ +/******************************************************/ + +/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */ +static inline __maybe_unused int h2s_id(const struct h2s *h2s) +{ + return h2s ? h2s->id : 0; +} + +/* returns the sum of the stream's own window size and the mux's initial + * window, which together form the stream's effective window size. + */ +static inline int h2s_mws(const struct h2s *h2s) +{ + return h2s->sws + h2s->h2c->miw; +} + +/* marks an error on the connection. Before settings are sent, we must not send + * a GOAWAY frame, and the error state will prevent h2c_send_goaway_error() + * from verifying this so we set H2_CF_GOAWAY_FAILED to make sure it will not + * even try. + */ +static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err) +{ + TRACE_POINT(H2_EV_H2C_ERR, h2c->conn, 0, 0, (void *)(long)(err)); + h2c->errcode = err; + if (h2c->st0 < H2_CS_SETTINGS1) + h2c->flags |= H2_CF_GOAWAY_FAILED; + h2c->st0 = H2_CS_ERROR; +} + +/* marks an error on the stream. It may also update an already closed stream + * (e.g. to report an error after an RST was received). + */ +static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err) +{ + if (h2s->id && h2s->st != H2_SS_ERROR) { + TRACE_POINT(H2_EV_H2S_ERR, h2s->h2c->conn, h2s, 0, (void *)(long)(err)); + h2s->errcode = err; + if (h2s->st < H2_SS_ERROR) + h2s->st = H2_SS_ERROR; + se_fl_set_error(h2s->sd); + } +} + +/* attempt to notify the data layer of recv availability */ +static void __maybe_unused h2s_notify_recv(struct h2s *h2s) +{ + if (h2s->subs && h2s->subs->events & SUB_RETRY_RECV) { + TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s); + tasklet_wakeup(h2s->subs->tasklet); + h2s->subs->events &= ~SUB_RETRY_RECV; + if (!h2s->subs->events) + h2s->subs = NULL; + } +} + +/* attempt to notify the data layer of send availability */ +static void __maybe_unused h2s_notify_send(struct h2s *h2s) +{ + if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) { + TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s); + h2s->flags |= H2_SF_NOTIFIED; + tasklet_wakeup(h2s->subs->tasklet); + h2s->subs->events &= ~SUB_RETRY_SEND; + if (!h2s->subs->events) + h2s->subs = NULL; + } + else if (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) { + TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s); + tasklet_wakeup(h2s->shut_tl); + } +} + +/* alerts the data layer, trying to wake it up by all means, following + * this sequence : + * - if the h2s' data layer is subscribed to recv, then it's woken up for recv + * - if its subscribed to send, then it's woken up for send + * - if it was subscribed to neither, its ->wake() callback is called + * It is safe to call this function with a closed stream which doesn't have a + * stream connector anymore. + */ +static void __maybe_unused h2s_alert(struct h2s *h2s) +{ + TRACE_ENTER(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s); + + if (h2s->subs || + (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW))) { + h2s_notify_recv(h2s); + h2s_notify_send(h2s); + } + else if (h2s_sc(h2s) && h2s_sc(h2s)->app_ops->wake != NULL) { + TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s); + h2s_sc(h2s)->app_ops->wake(h2s_sc(h2s)); + } + + TRACE_LEAVE(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s); +} + +/* writes the 24-bit frame size <len> at address <frame> */ +static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len) +{ + uint8_t *out = frame; + + *out = len >> 16; + write_n16(out + 1, len); +} + +/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the + * current pointer, dealing with wrapping, and stores the result in <dst>. It's + * the caller's responsibility to verify that there are at least <bytes> bytes + * available in the buffer's input prior to calling this function. The buffer + * is assumed not to hold any output data. + */ +static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes, + const struct buffer *b, int o) +{ + readv_bytes(dst, bytes, b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b)); +} + +static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o) +{ + return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b)); +} + +static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o) +{ + return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b)); +} + +static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o) +{ + return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b)); +} + + +/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>. + * The algorithm is not obvious. It turns out that H2 headers are neither + * aligned nor do they use regular sizes. And to add to the trouble, the buffer + * may wrap so each byte read must be checked. The header is formed like this : + * + * b0 b1 b2 b3 b4 b5..b8 + * +----------+---------+--------+----+----+----------------------+ + * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)| + * +----------+---------+--------+----+----+----------------------+ + * + * Here we read a big-endian 64 bit word from h[1]. This way in a single read + * we get the sid properly aligned and ordered, and 16 bits of len properly + * ordered as well. The type and flags can be extracted using bit shifts from + * the word, and only one extra read is needed to fetch len[16:23]. + * Returns zero if some bytes are missing, otherwise non-zero on success. The + * buffer is assumed not to contain any output data. + */ +static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h) +{ + uint64_t w; + + if (b_data(b) < o + 9) + return 0; + + w = h2_get_n64(b, o + 1); + h->len = *(uint8_t*)b_peek(b, o) << 16; + h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */ + h->ff = w >> 32; + h->ft = w >> 40; + h->len += w >> 48; + return 1; +} + +/* skip the next 9 bytes corresponding to the frame header possibly parsed by + * h2_peek_frame_hdr() above. + */ +static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b) +{ + b_del(b, 9); +} + +/* same as above, automatically advances the buffer on success */ +static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h) +{ + int ret; + + ret = h2_peek_frame_hdr(b, 0, h); + if (ret > 0) + h2_skip_frame_hdr(b); + return ret; +} + + +/* try to fragment the headers frame present at the beginning of buffer <b>, + * enforcing a limit of <mfs> bytes per frame. Returns 0 on failure, 1 on + * success. Typical causes of failure include a buffer not large enough to + * add extra frame headers. The existing frame size is read in the current + * frame. Its EH flag will be cleared if CONTINUATION frames need to be added, + * and its length will be adjusted. The stream ID for continuation frames will + * be copied from the initial frame's. + */ +static int h2_fragment_headers(struct buffer *b, uint32_t mfs) +{ + size_t remain = b->data - 9; + int extra_frames = (remain - 1) / mfs; + size_t fsize; + char *fptr; + int frame; + + if (b->data <= mfs + 9) + return 1; + + /* Too large a frame, we need to fragment it using CONTINUATION + * frames. We start from the end and move tails as needed. + */ + if (b->data + extra_frames * 9 > b->size) + return 0; + + for (frame = extra_frames; frame; frame--) { + fsize = ((remain - 1) % mfs) + 1; + remain -= fsize; + + /* move data */ + fptr = b->area + 9 + remain + (frame - 1) * 9; + memmove(fptr + 9, b->area + 9 + remain, fsize); + b->data += 9; + + /* write new frame header */ + h2_set_frame_size(fptr, fsize); + fptr[3] = H2_FT_CONTINUATION; + fptr[4] = (frame == extra_frames) ? H2_F_HEADERS_END_HEADERS : 0; + write_n32(fptr + 5, read_n32(b->area + 5)); + } + + b->area[4] &= ~H2_F_HEADERS_END_HEADERS; + h2_set_frame_size(b->area, remain); + return 1; +} + + +/* marks stream <h2s> as CLOSED and decrement the number of active streams for + * its connection if the stream was not yet closed. Please use this exclusively + * before closing a stream to ensure stream count is well maintained. Note that + * it does explicitly support being called with a partially initialized h2s + * (e.g. sd==NULL). + */ +static inline void h2s_close(struct h2s *h2s) +{ + if (h2s->st != H2_SS_CLOSED) { + TRACE_ENTER(H2_EV_H2S_END, h2s->h2c->conn, h2s); + h2s->h2c->nb_streams--; + if (!h2s->id) + h2s->h2c->nb_reserved--; + if (h2s->sd && h2s_sc(h2s)) { + if (!se_fl_test(h2s->sd, SE_FL_EOS) && !b_data(&h2s->rxbuf)) + h2s_notify_recv(h2s); + } + HA_ATOMIC_DEC(&h2s->h2c->px_counters->open_streams); + + TRACE_LEAVE(H2_EV_H2S_END, h2s->h2c->conn, h2s); + } + h2s->st = H2_SS_CLOSED; +} + +/* Check h2c and h2s flags to evaluate if EOI/EOS/ERR_PENDING/ERROR flags must + * be set on the SE. + */ +static inline void h2s_propagate_term_flags(struct h2c *h2c, struct h2s *h2s) +{ + if (h2s->flags & H2_SF_ES_RCVD) { + se_fl_set(h2s->sd, SE_FL_EOI); + /* Add EOS flag for tunnel */ + if (h2s->flags & H2_SF_BODY_TUNNEL) + se_fl_set(h2s->sd, SE_FL_EOS); + } + if (h2c_read0_pending(h2c) || h2s->st == H2_SS_CLOSED) { + se_fl_set(h2s->sd, SE_FL_EOS); + if (!se_fl_test(h2s->sd, SE_FL_EOI)) + se_fl_set(h2s->sd, SE_FL_ERROR); + } + if (se_fl_test(h2s->sd, SE_FL_ERR_PENDING)) + se_fl_set(h2s->sd, SE_FL_ERROR); +} + +/* detaches an H2 stream from its H2C and releases it to the H2S pool. */ +/* h2s_destroy should only ever be called by the thread that owns the stream, + * that means that a tasklet should be used if we want to destroy the h2s + * from another thread + */ +static void h2s_destroy(struct h2s *h2s) +{ + struct connection *conn = h2s->h2c->conn; + + TRACE_ENTER(H2_EV_H2S_END, conn, h2s); + + h2s_close(h2s); + eb32_delete(&h2s->by_id); + if (b_size(&h2s->rxbuf)) { + b_free(&h2s->rxbuf); + offer_buffers(NULL, 1); + } + + if (h2s->subs) + h2s->subs->events = 0; + + /* There's no need to explicitly call unsubscribe here, the only + * reference left would be in the h2c send_list/fctl_list, and if + * we're in it, we're getting out anyway + */ + h2_remove_from_list(h2s); + + /* ditto, calling tasklet_free() here should be ok */ + tasklet_free(h2s->shut_tl); + BUG_ON(h2s->sd && !se_fl_test(h2s->sd, SE_FL_ORPHAN)); + sedesc_free(h2s->sd); + pool_free(pool_head_h2s, h2s); + + TRACE_LEAVE(H2_EV_H2S_END, conn); +} + +/* allocates a new stream <id> for connection <h2c> and adds it into h2c's + * stream tree. In case of error, nothing is added and NULL is returned. The + * causes of errors can be any failed memory allocation. The caller is + * responsible for checking if the connection may support an extra stream + * prior to calling this function. + */ +static struct h2s *h2s_new(struct h2c *h2c, int id) +{ + struct h2s *h2s; + + TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn); + + h2s = pool_alloc(pool_head_h2s); + if (!h2s) + goto out; + + h2s->shut_tl = tasklet_new(); + if (!h2s->shut_tl) { + pool_free(pool_head_h2s, h2s); + goto out; + } + h2s->subs = NULL; + h2s->shut_tl->process = h2_deferred_shut; + h2s->shut_tl->context = h2s; + LIST_INIT(&h2s->list); + h2s->h2c = h2c; + h2s->sd = NULL; + h2s->sws = 0; + h2s->flags = H2_SF_NONE; + h2s->errcode = H2_ERR_NO_ERROR; + h2s->st = H2_SS_IDLE; + h2s->status = 0; + h2s->body_len = 0; + h2s->rxbuf = BUF_NULL; + memset(h2s->upgrade_protocol, 0, sizeof(h2s->upgrade_protocol)); + + h2s->by_id.key = h2s->id = id; + if (id > 0) + h2c->max_id = id; + else + h2c->nb_reserved++; + + eb32_insert(&h2c->streams_by_id, &h2s->by_id); + h2c->nb_streams++; + + HA_ATOMIC_INC(&h2c->px_counters->open_streams); + HA_ATOMIC_INC(&h2c->px_counters->total_streams); + + TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s); + return h2s; + out: + TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn); + return NULL; +} + +/* creates a new stream <id> on the h2c connection and returns it, or NULL in + * case of memory allocation error. <input> is used as input buffer for the new + * stream. On success, it is transferred to the stream and the mux is no longer + * responsible of it. On error, <input> is unchanged, thus the mux must still + * take care of it. + */ +static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id, struct buffer *input, uint32_t flags) +{ + struct session *sess = h2c->conn->owner; + struct h2s *h2s; + + TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn); + + /* Cannot handle stream if active reversed connection is not yet accepted. */ + BUG_ON(conn_reverse_in_preconnect(h2c->conn)); + + if (h2c->nb_streams >= h2c_max_concurrent_streams(h2c)) { + TRACE_ERROR("HEADERS frame causing MAX_CONCURRENT_STREAMS to be exceeded", H2_EV_H2S_NEW|H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn); + session_inc_http_req_ctr(sess); + session_inc_http_err_ctr(sess); + goto out; + } + + h2s = h2s_new(h2c, id); + if (!h2s) + goto out_alloc; + + h2s->sd = sedesc_new(); + if (!h2s->sd) + goto out_close; + h2s->sd->se = h2s; + h2s->sd->conn = h2c->conn; + se_fl_set(h2s->sd, SE_FL_T_MUX | SE_FL_ORPHAN | SE_FL_NOT_FIRST); + + if (!(global.tune.no_zero_copy_fwd & NO_ZERO_COPY_FWD_H2_SND)) + se_fl_set(h2s->sd, SE_FL_MAY_FASTFWD_CONS); + + /* The request is not finished, don't expect data from the opposite side + * yet + */ + if (!(h2c->dff & (H2_F_HEADERS_END_STREAM| H2_F_DATA_END_STREAM)) && !(flags & H2_SF_BODY_TUNNEL)) + se_expect_no_data(h2s->sd); + + /* FIXME wrong analogy between ext-connect and websocket, this need to + * be refine. + */ + if (flags & H2_SF_EXT_CONNECT_RCVD) + se_fl_set(h2s->sd, SE_FL_WEBSOCKET); + + /* The stream will record the request's accept date (which is either the + * end of the connection's or the date immediately after the previous + * request) and the idle time, which is the delay since the previous + * request. We can set the value now, it will be copied by stream_new(). + */ + sess->t_idle = ns_to_ms(now_ns - sess->accept_ts) - sess->t_handshake; + + if (!sc_new_from_endp(h2s->sd, sess, input)) + goto out_close; + + h2c->nb_sc++; + + /* We want the accept date presented to the next stream to be the one + * we have now, the handshake time to be null (since the next stream + * is not delayed by a handshake), and the idle time to count since + * right now. + */ + sess->accept_date = date; + sess->accept_ts = now_ns; + sess->t_handshake = 0; + sess->t_idle = 0; + + /* OK done, the stream lives its own life now */ + if (h2_frt_has_too_many_sc(h2c)) + h2c->flags |= H2_CF_DEM_TOOMANY; + TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn); + return h2s; + + out_close: + h2s_destroy(h2s); + out_alloc: + TRACE_ERROR("Failed to allocate a new stream", H2_EV_H2S_NEW|H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn); + out: + sess_log(sess); + TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn); + return NULL; +} + +/* allocates a new stream associated to stream connector <sc> on the h2c + * connection and returns it, or NULL in case of memory allocation error or if + * the highest possible stream ID was reached. + */ +static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct stconn *sc, struct session *sess) +{ + struct h2s *h2s = NULL; + + TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn); + + /* Cannot handle stream if connection waiting to be reversed. */ + BUG_ON(conn_reverse_in_preconnect(h2c->conn)); + + if (h2c->nb_streams >= h2c->streams_limit) { + TRACE_ERROR("Aborting stream since negotiated limit is too low", H2_EV_H2S_NEW, h2c->conn); + goto out; + } + + if (h2_streams_left(h2c) < 1) { + TRACE_ERROR("Aborting stream since no more streams left", H2_EV_H2S_NEW, h2c->conn); + goto out; + } + + /* Defer choosing the ID until we send the first message to create the stream */ + h2s = h2s_new(h2c, 0); + if (!h2s) { + TRACE_ERROR("Failed to allocate a new stream", H2_EV_H2S_NEW, h2c->conn); + goto out; + } + + if (sc_attach_mux(sc, h2s, h2c->conn) < 0) { + TRACE_ERROR("Failed to allocate a new stream", H2_EV_H2S_NEW, h2c->conn); + h2s_destroy(h2s); + h2s = NULL; + goto out; + } + h2s->sd = sc->sedesc; + h2s->sess = sess; + h2c->nb_sc++; + + if (!(global.tune.no_zero_copy_fwd & NO_ZERO_COPY_FWD_H2_SND)) + se_fl_set(h2s->sd, SE_FL_MAY_FASTFWD_CONS); + /* on the backend we can afford to only count total streams upon success */ + h2c->stream_cnt++; + + out: + if (likely(h2s)) + TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s); + else + TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn, h2s); + return h2s; +} + +/* try to send a settings frame on the connection. Returns > 0 on success, 0 if + * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for + * the various settings codes. + */ +static int h2c_send_settings(struct h2c *h2c) +{ + struct buffer *res; + char buf_data[100]; // enough for 15 settings + struct buffer buf; + int iws; + int mfs; + int mcs; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn); + + chunk_init(&buf, buf_data, sizeof(buf_data)); + chunk_memcpy(&buf, + "\x00\x00\x00" /* length : 0 for now */ + "\x04\x00" /* type : 4 (settings), flags : 0 */ + "\x00\x00\x00\x00", /* stream ID : 0 */ + 9); + + if (h2c->flags & H2_CF_IS_BACK) { + /* send settings_enable_push=0 */ + chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6); + } + + /* rfc 8441 #3 SETTINGS_ENABLE_CONNECT_PROTOCOL=1, + * sent automatically unless disabled in the global config */ + if (!(global.tune.options & GTUNE_DISABLE_H2_WEBSOCKET)) + chunk_memcat(&buf, "\x00\x08\x00\x00\x00\x01", 6); + + if (h2_settings_header_table_size != 4096) { + char str[6] = "\x00\x01"; /* header_table_size */ + + write_n32(str + 2, h2_settings_header_table_size); + chunk_memcat(&buf, str, 6); + } + + iws = (h2c->flags & H2_CF_IS_BACK) ? + h2_be_settings_initial_window_size: + h2_fe_settings_initial_window_size; + iws = iws ? iws : h2_settings_initial_window_size; + + if (iws != 65535) { + char str[6] = "\x00\x04"; /* initial_window_size */ + + write_n32(str + 2, iws); + chunk_memcat(&buf, str, 6); + } + + mcs = h2c_max_concurrent_streams(h2c); + if (mcs != 0) { + char str[6] = "\x00\x03"; /* max_concurrent_streams */ + + /* Note: 0 means "unlimited" for haproxy's config but not for + * the protocol, so never send this value! + */ + write_n32(str + 2, mcs); + chunk_memcat(&buf, str, 6); + } + + mfs = h2_settings_max_frame_size; + if (mfs > global.tune.bufsize) + mfs = global.tune.bufsize; + + if (!mfs) + mfs = global.tune.bufsize; + + if (mfs != 16384) { + char str[6] = "\x00\x05"; /* max_frame_size */ + + /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to + * match bufsize - rewrite size, but at the moment it seems + * that clients don't take care of it. + */ + write_n32(str + 2, mfs); + chunk_memcat(&buf, str, 6); + } + + h2_set_frame_size(buf.area, buf.data - 9); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + + ret = b_istput(res, ist2(buf.area, buf.data)); + if (unlikely(ret <= 0)) { + if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2c->flags |= H2_CF_DEM_MROOM; + } + else { + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = 0; + } + } + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn); + return ret; +} + +/* Try to receive a connection preface, then upon success try to send our + * preface which is a SETTINGS frame. Returns > 0 on success or zero on + * missing data. It may return an error in h2c. + */ +static int h2c_frt_recv_preface(struct h2c *h2c) +{ + int ret1; + int ret2; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn); + + ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE)); + + if (unlikely(ret1 <= 0)) { + if (!ret1) + h2c->flags |= H2_CF_DEM_SHORT_READ; + if (ret1 < 0 || (h2c->flags & H2_CF_RCVD_SHUT)) { + TRACE_ERROR("I/O error or short read", H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + if (b_data(&h2c->dbuf) || + !(((const struct session *)h2c->conn->owner)->fe->options & PR_O_IGNORE_PRB)) + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + } + ret2 = 0; + goto out; + } + + ret2 = h2c_send_settings(h2c); + if (ret2 > 0) + b_del(&h2c->dbuf, ret1); + out: + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn); + return ret2; +} + +/* Try to send a connection preface, then upon success try to send our + * preface which is a SETTINGS frame. Returns > 0 on success or zero on + * missing data. It may return an error in h2c. + */ +static int h2c_bck_send_preface(struct h2c *h2c) +{ + struct buffer *res; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + + if (!b_data(res)) { + /* preface not yet sent */ + ret = b_istput(res, ist(H2_CONN_PREFACE)); + if (unlikely(ret <= 0)) { + if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + else { + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = 0; + goto out; + } + } + } + ret = h2c_send_settings(h2c); + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn); + return ret; +} + +/* try to send a GOAWAY frame on the connection to report an error or a graceful + * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero + * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it + * from h2c->max_id if it's not set yet (<0). In case of lack of room to write + * the message, it subscribes the requester (either <h2s> or <h2c>) to future + * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED + * on unrecoverable failure. It will not attempt to send one again in this last + * case, nor will it send one if settings were not sent (e.g. still waiting for + * a preface) so that it is safe to use h2c_error() to report such errors. + */ +static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s) +{ + struct buffer *res; + char str[17]; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn); + + if ((h2c->flags & H2_CF_GOAWAY_FAILED) || h2c->st0 < H2_CS_SETTINGS1) { + ret = 1; // claim that it worked + goto out; + } + + /* len: 8, type: 7, flags: none, sid: 0 */ + memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9); + + if (h2c->last_sid < 0) + h2c->last_sid = h2c->max_id; + + write_n32(str + 9, h2c->last_sid); + write_n32(str + 13, h2c->errcode); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + if (h2s) + h2s->flags |= H2_SF_BLK_MROOM; + else + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + + ret = b_istput(res, ist2(str, 17)); + if (unlikely(ret <= 0)) { + if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + if (h2s) + h2s->flags |= H2_SF_BLK_MROOM; + else + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + else { + /* we cannot report this error using GOAWAY, so we mark + * it and claim a success. + */ + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + h2c->flags |= H2_CF_GOAWAY_FAILED; + ret = 1; + goto out; + } + } + h2c->flags |= H2_CF_GOAWAY_SENT; + + /* some codes are not for real errors, just attempts to close cleanly */ + switch (h2c->errcode) { + case H2_ERR_NO_ERROR: + case H2_ERR_ENHANCE_YOUR_CALM: + case H2_ERR_REFUSED_STREAM: + case H2_ERR_CANCEL: + break; + default: + HA_ATOMIC_INC(&h2c->px_counters->goaway_resp); + } + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn); + return ret; +} + +/* Try to send an RST_STREAM frame on the connection for the indicated stream + * during mux operations. This stream must be valid and cannot be closed + * already. h2s->id will be used for the stream ID and h2s->errcode will be + * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was + * not yet. + * + * Returns > 0 on success or zero if nothing was done. In case of lack of room + * to write the message, it subscribes the stream to future notifications. + */ +static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s) +{ + struct buffer *res; + char str[13]; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s); + + if (!h2s || h2s->st == H2_SS_CLOSED) { + ret = 1; + goto out; + } + + /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a + * RST_STREAM in response to a RST_STREAM frame. + */ + if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) { + ret = 1; + goto ignore; + } + + /* len: 4, type: 3, flags: none */ + memcpy(str, "\x00\x00\x04\x03\x00", 5); + write_n32(str + 5, h2s->id); + write_n32(str + 9, h2s->errcode); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2s->flags |= H2_SF_BLK_MROOM; + goto out; + } + + ret = b_istput(res, ist2(str, 13)); + if (unlikely(ret <= 0)) { + if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + goto out; + } + else { + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = 0; + goto out; + } + } + + ignore: + h2s->flags |= H2_SF_RST_SENT; + h2s_close(h2s); + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s); + return ret; +} + +/* Try to send an RST_STREAM frame on the connection for the stream being + * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the + * error code, even if the stream is one of the dummy ones, and will update + * h2s->st to H2_SS_CLOSED if it was not yet. + * + * Returns > 0 on success or zero if nothing was done. In case of lack of room + * to write the message, it blocks the demuxer and subscribes it to future + * notifications. It's worth mentioning that an RST may even be sent for a + * closed stream. + */ +static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s) +{ + struct buffer *res; + char str[13]; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s); + + /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a + * RST_STREAM in response to a RST_STREAM frame. + */ + if (h2c->dft == H2_FT_RST_STREAM) { + ret = 1; + goto ignore; + } + + /* len: 4, type: 3, flags: none */ + memcpy(str, "\x00\x00\x04\x03\x00", 5); + + write_n32(str + 5, h2c->dsi); + write_n32(str + 9, h2s->errcode); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + + ret = b_istput(res, ist2(str, 13)); + if (unlikely(ret <= 0)) { + if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + else { + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = 0; + goto out; + } + } + + ignore: + if (h2s->id) { + h2s->flags |= H2_SF_RST_SENT; + h2s_close(h2s); + } + + out: + HA_ATOMIC_INC(&h2c->px_counters->rst_stream_resp); + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s); + return ret; +} + +/* try to send an empty DATA frame with the ES flag set to notify about the + * end of stream and match a shutdown(write). If an ES was already sent as + * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0 + * on success or zero if nothing was done. In case of lack of room to write the + * message, it subscribes the requesting stream to future notifications. + */ +static int h2_send_empty_data_es(struct h2s *h2s) +{ + struct h2c *h2c = h2s->h2c; + struct buffer *res; + char str[9]; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s); + + if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) { + ret = 1; + goto out; + } + + /* len: 0x000000, type: 0(DATA), flags: ES=1 */ + memcpy(str, "\x00\x00\x00\x00\x01", 5); + write_n32(str + 5, h2s->id); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2s->flags |= H2_SF_BLK_MROOM; + goto out; + } + + ret = b_istput(res, ist2(str, 9)); + if (likely(ret > 0)) { + h2s->flags |= H2_SF_ES_SENT; + } + else if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + } + else { + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = 0; + } + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s); + return ret; +} + +/* wake a specific stream and assign its stream connector some SE_FL_* flags + * among SE_FL_ERR_PENDING and SE_FL_ERROR if needed. The stream's state + * is automatically updated accordingly. If the stream is orphaned, it is + * destroyed. + */ +static void h2s_wake_one_stream(struct h2s *h2s) +{ + struct h2c *h2c = h2s->h2c; + + TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s); + + if (!h2s_sc(h2s)) { + /* this stream was already orphaned */ + h2s_destroy(h2s); + TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn); + return; + } + + if (h2c_read0_pending(h2s->h2c)) { + if (h2s->st == H2_SS_OPEN) + h2s->st = H2_SS_HREM; + else if (h2s->st == H2_SS_HLOC) + h2s_close(h2s); + } + + if ((h2s->st != H2_SS_CLOSED) && + (h2s->h2c->st0 >= H2_CS_ERROR || (h2s->h2c->flags & H2_CF_ERROR) || + (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid)))) { + se_fl_set_error(h2s->sd); + + if (h2s->st < H2_SS_ERROR) + h2s->st = H2_SS_ERROR; + } + + h2s_alert(h2s); + TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn); +} + +/* wake the streams attached to the connection, whose id is greater than <last> + * or unassigned. + */ +static void h2_wake_some_streams(struct h2c *h2c, int last) +{ + struct eb32_node *node; + struct h2s *h2s; + + TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn); + + /* Wake all streams with ID > last */ + node = eb32_lookup_ge(&h2c->streams_by_id, last + 1); + while (node) { + h2s = container_of(node, struct h2s, by_id); + node = eb32_next(node); + h2s_wake_one_stream(h2s); + } + + /* Wake all streams with unassigned ID (ID == 0) */ + node = eb32_lookup(&h2c->streams_by_id, 0); + while (node) { + h2s = container_of(node, struct h2s, by_id); + if (h2s->id > 0) + break; + node = eb32_next(node); + h2s_wake_one_stream(h2s); + } + + TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn); +} + +/* Wake up all blocked streams whose window size has become positive after the + * mux's initial window was adjusted. This should be done after having processed + * SETTINGS frames which have updated the mux's initial window size. + */ +static void h2c_unblock_sfctl(struct h2c *h2c) +{ + struct h2s *h2s; + struct eb32_node *node; + + TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn); + + node = eb32_first(&h2c->streams_by_id); + while (node) { + h2s = container_of(node, struct h2s, by_id); + if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) { + h2s->flags &= ~H2_SF_BLK_SFCTL; + LIST_DEL_INIT(&h2s->list); + if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) || + h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) + LIST_APPEND(&h2c->send_list, &h2s->list); + } + node = eb32_next(node); + } + + TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn); +} + +/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and + * ACKs it if needed. Returns > 0 on success or zero on missing data. It may + * return an error in h2c. The caller must have already verified frame length + * and stream ID validity. Described in RFC7540#6.5. + */ +static int h2c_handle_settings(struct h2c *h2c) +{ + unsigned int offset; + int error; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn); + + if (h2c->dff & H2_F_SETTINGS_ACK) { + if (h2c->dfl) { + error = H2_ERR_FRAME_SIZE_ERROR; + goto fail; + } + goto done; + } + + /* process full frame only */ + if (b_data(&h2c->dbuf) < h2c->dfl) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto out0; + } + + /* parse the frame */ + for (offset = 0; offset < h2c->dfl; offset += 6) { + uint16_t type = h2_get_n16(&h2c->dbuf, offset); + int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2); + + switch (type) { + case H2_SETTINGS_INITIAL_WINDOW_SIZE: + /* we need to update all existing streams with the + * difference from the previous iws. + */ + if (arg < 0) { // RFC7540#6.5.2 + error = H2_ERR_FLOW_CONTROL_ERROR; + goto fail; + } + h2c->miw = arg; + break; + case H2_SETTINGS_MAX_FRAME_SIZE: + if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2 + TRACE_ERROR("MAX_FRAME_SIZE out of range", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn); + error = H2_ERR_PROTOCOL_ERROR; + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto fail; + } + h2c->mfs = arg; + break; + case H2_SETTINGS_HEADER_TABLE_SIZE: + h2c->flags |= H2_CF_SHTS_UPDATED; + break; + case H2_SETTINGS_ENABLE_PUSH: + if (arg < 0 || arg > 1) { // RFC7540#6.5.2 + TRACE_ERROR("ENABLE_PUSH out of range", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn); + error = H2_ERR_PROTOCOL_ERROR; + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto fail; + } + break; + case H2_SETTINGS_MAX_CONCURRENT_STREAMS: + if (h2c->flags & H2_CF_IS_BACK) { + /* the limit is only for the backend; for the frontend it is our limit */ + if ((unsigned int)arg > h2c_max_concurrent_streams(h2c)) + arg = h2c_max_concurrent_streams(h2c); + h2c->streams_limit = arg; + } + break; + case H2_SETTINGS_ENABLE_CONNECT_PROTOCOL: + if (arg == 1) + h2c->flags |= H2_CF_RCVD_RFC8441; + break; + } + } + + /* need to ACK this frame now */ + h2c->st0 = H2_CS_FRAME_A; + done: + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn); + return 1; + fail: + if (!(h2c->flags & H2_CF_IS_BACK)) + sess_log(h2c->conn->owner); + h2c_error(h2c, error); + out0: + TRACE_DEVEL("leaving with missing data or error", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn); + return 0; +} + +/* try to send an ACK for a settings frame on the connection. Returns > 0 on + * success or one of the h2_status values. + */ +static int h2c_ack_settings(struct h2c *h2c) +{ + struct buffer *res; + char str[9]; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn); + + memcpy(str, + "\x00\x00\x00" /* length : 0 (no data) */ + "\x04" "\x01" /* type : 4, flags : ACK */ + "\x00\x00\x00\x00" /* stream ID */, 9); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + + ret = b_istput(res, ist2(str, 9)); + if (unlikely(ret <= 0)) { + if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2c->flags |= H2_CF_DEM_MROOM; + } + else { + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = 0; + } + } + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn); + return ret; +} + +/* processes a PING frame and schedules an ACK if needed. The caller must pass + * the pointer to the payload in <payload>. Returns > 0 on success or zero on + * missing data. The caller must have already verified frame length + * and stream ID validity. + */ +static int h2c_handle_ping(struct h2c *h2c) +{ + /* schedule a response */ + if (!(h2c->dff & H2_F_PING_ACK)) + h2c->st0 = H2_CS_FRAME_A; + return 1; +} + +/* Try to send a window update for stream id <sid> and value <increment>. + * Returns > 0 on success or zero on missing room or failure. It may return an + * error in h2c. + */ +static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment) +{ + struct buffer *res; + char str[13]; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn); + + /* length: 4, type: 8, flags: none */ + memcpy(str, "\x00\x00\x04\x08\x00", 5); + write_n32(str + 5, sid); + write_n32(str + 9, increment); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + + ret = b_istput(res, ist2(str, 13)); + if (unlikely(ret <= 0)) { + if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2c->flags |= H2_CF_DEM_MROOM; + } + else { + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = 0; + } + } + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn); + return ret; +} + +/* try to send pending window update for the connection. It's safe to call it + * with no pending updates. Returns > 0 on success or zero on missing room or + * failure. It may return an error in h2c. + */ +static int h2c_send_conn_wu(struct h2c *h2c) +{ + int ret = 1; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn); + + if (h2c->rcvd_c <= 0) + goto out; + + if (!(h2c->flags & H2_CF_WINDOW_OPENED)) { + /* increase the advertised connection window to 2G on + * first update. + */ + h2c->flags |= H2_CF_WINDOW_OPENED; + h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT; + } + + /* send WU for the connection */ + ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c); + if (ret > 0) + h2c->rcvd_c = 0; + + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn); + return ret; +} + +/* try to send pending window update for the current dmux stream. It's safe to + * call it with no pending updates. Returns > 0 on success or zero on missing + * room or failure. It may return an error in h2c. + */ +static int h2c_send_strm_wu(struct h2c *h2c) +{ + int ret = 1; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn); + + if (h2c->rcvd_s <= 0) + goto out; + + /* send WU for the stream */ + ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s); + if (ret > 0) + h2c->rcvd_s = 0; + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn); + return ret; +} + +/* try to send an ACK for a ping frame on the connection. Returns > 0 on + * success, 0 on missing data or one of the h2_status values. + */ +static int h2c_ack_ping(struct h2c *h2c) +{ + struct buffer *res; + char str[17]; + int ret = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn); + + if (b_data(&h2c->dbuf) < 8) + goto out; + + memcpy(str, + "\x00\x00\x08" /* length : 8 (same payload) */ + "\x06" "\x01" /* type : 6, flags : ACK */ + "\x00\x00\x00\x00" /* stream ID */, 9); + + /* copy the original payload */ + h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0); + + res = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, res)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2c->flags |= H2_CF_DEM_MROOM; + goto out; + } + + ret = b_istput(res, ist2(str, 17)); + if (unlikely(ret <= 0)) { + if (!ret) { + if ((res = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2c->flags |= H2_CF_DEM_MROOM; + } + else { + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = 0; + } + } + out: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn); + return ret; +} + +/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes. + * Returns > 0 on success or zero on missing data. It may return an error in + * h2c or h2s. The caller must have already verified frame length and stream ID + * validity. Described in RFC7540#6.9. + */ +static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s) +{ + int32_t inc; + int error; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn); + + /* process full frame only */ + if (b_data(&h2c->dbuf) < h2c->dfl) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto out0; + } + + inc = h2_get_n32(&h2c->dbuf, 0); + + if (h2c->dsi != 0) { + /* stream window update */ + + /* it's not an error to receive WU on a closed stream */ + if (h2s->st == H2_SS_CLOSED) + goto done; + + if (!inc) { + TRACE_ERROR("stream WINDOW_UPDATE inc=0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn, h2s); + error = H2_ERR_PROTOCOL_ERROR; + HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err); + goto strm_err; + } + + if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) { + TRACE_ERROR("stream WINDOW_UPDATE inc<0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn, h2s); + error = H2_ERR_FLOW_CONTROL_ERROR; + HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err); + goto strm_err; + } + + h2s->sws += inc; + if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) { + h2s->flags &= ~H2_SF_BLK_SFCTL; + LIST_DEL_INIT(&h2s->list); + if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) || + h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) + LIST_APPEND(&h2c->send_list, &h2s->list); + } + } + else { + /* connection window update */ + if (!inc) { + TRACE_ERROR("conn WINDOW_UPDATE inc=0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn); + error = H2_ERR_PROTOCOL_ERROR; + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto conn_err; + } + + if (h2c->mws >= 0 && h2c->mws + inc < 0) { + TRACE_ERROR("conn WINDOW_UPDATE inc<0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn); + error = H2_ERR_FLOW_CONTROL_ERROR; + goto conn_err; + } + + h2c->mws += inc; + } + + done: + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn); + return 1; + + conn_err: + h2c_error(h2c, error); + out0: + TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn); + return 0; + + strm_err: + h2s_error(h2s, error); + h2c->st0 = H2_CS_FRAME_E; + TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn); + return 0; +} + +/* processes a GOAWAY frame, and signals all streams whose ID is greater than + * the last ID. Returns > 0 on success or zero on missing data. The caller must + * have already verified frame length and stream ID validity. Described in + * RFC7540#6.8. + */ +static int h2c_handle_goaway(struct h2c *h2c) +{ + int last; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn); + /* process full frame only */ + if (b_data(&h2c->dbuf) < h2c->dfl) { + TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn); + h2c->flags |= H2_CF_DEM_SHORT_READ; + return 0; + } + + last = h2_get_n32(&h2c->dbuf, 0); + h2c->errcode = h2_get_n32(&h2c->dbuf, 4); + if (h2c->last_sid < 0) + h2c->last_sid = last; + h2_wake_some_streams(h2c, last); + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn); + return 1; +} + +/* processes a PRIORITY frame, and either skips it or rejects if it is + * invalid. Returns > 0 on success or zero on missing data. It may return an + * error in h2c. The caller must have already verified frame length and stream + * ID validity. Described in RFC7540#6.3. + */ +static int h2c_handle_priority(struct h2c *h2c) +{ + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn); + + /* process full frame only */ + if (b_data(&h2c->dbuf) < h2c->dfl) { + TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn); + h2c->flags |= H2_CF_DEM_SHORT_READ; + return 0; + } + + if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) { + /* 7540#5.3 : can't depend on itself */ + TRACE_ERROR("PRIORITY depends on itself", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn); + return 0; + } + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn); + return 1; +} + +/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream. + * Returns > 0 on success or zero on missing data. The caller must have already + * verified frame length and stream ID validity. Described in RFC7540#6.4. + */ +static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s) +{ + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s); + + /* process full frame only */ + if (b_data(&h2c->dbuf) < h2c->dfl) { + TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s); + h2c->flags |= H2_CF_DEM_SHORT_READ; + return 0; + } + + /* late RST, already handled */ + if (h2s->st == H2_SS_CLOSED) { + TRACE_DEVEL("leaving on stream closed", H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s); + return 1; + } + + h2s->errcode = h2_get_n32(&h2c->dbuf, 0); + h2s_close(h2s); + + if (h2s_sc(h2s)) { + se_fl_set_error(h2s->sd); + h2s_alert(h2s); + } + + h2s->flags |= H2_SF_RST_RCVD; + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s); + return 1; +} + +/* processes a HEADERS frame. Returns h2s on success or NULL on missing data. + * It may return an error in h2c or h2s. The caller must consider that the + * return value is the new h2s in case one was allocated (most common case). + * Described in RFC7540#6.2. Most of the + * errors here are reported as connection errors since it's impossible to + * recover from such errors after the compression context has been altered. + */ +static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s) +{ + struct buffer rxbuf = BUF_NULL; + unsigned long long body_len = 0; + uint32_t flags = 0; + int error; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + + if (!b_size(&h2c->dbuf)) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto out; // empty buffer + } + + if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf)) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto out; // incomplete frame + } + + /* now either the frame is complete or the buffer is complete */ + if (h2s->st != H2_SS_IDLE) { + /* The stream exists/existed, this must be a trailers frame */ + if (h2s->st != H2_SS_CLOSED) { + error = h2c_dec_hdrs(h2c, &h2s->rxbuf, &h2s->flags, &body_len, NULL); + /* unrecoverable error ? */ + if (h2c->st0 >= H2_CS_ERROR) { + TRACE_USER("Unrecoverable error decoding H2 trailers", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, 0, &rxbuf); + sess_log(h2c->conn->owner); + goto out; + } + + if (error == 0) { + /* Demux not blocked because of the stream, it is an incomplete frame */ + if (!(h2c->flags &H2_CF_DEM_BLOCK_ANY)) + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto out; // missing data + } + + if (error < 0) { + /* Failed to decode this frame (e.g. too large request) + * but the HPACK decompressor is still synchronized. + */ + sess_log(h2c->conn->owner); + h2s_error(h2s, H2_ERR_INTERNAL_ERROR); + TRACE_USER("Stream error decoding H2 trailers", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, 0, &rxbuf); + h2c->st0 = H2_CS_FRAME_E; + goto out; + } + goto done; + } + /* the stream was already killed by an RST, let's consume + * the data and send another RST. + */ + error = h2c_dec_hdrs(h2c, &rxbuf, &flags, &body_len, NULL); + sess_log(h2c->conn->owner); + h2s = (struct h2s*)h2_error_stream; + TRACE_USER("rcvd H2 trailers on closed stream", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, h2s, &rxbuf); + goto send_rst; + } + else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) { + /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */ + error = H2_ERR_PROTOCOL_ERROR; + TRACE_ERROR("HEADERS on invalid stream ID", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + sess_log(h2c->conn->owner); + session_inc_http_req_ctr(h2c->conn->owner); + session_inc_http_err_ctr(h2c->conn->owner); + goto conn_err; + } + else if (h2c->flags & H2_CF_DEM_TOOMANY) { + goto out; // IDLE but too many sc still present + } + else if (h2_fe_max_total_streams && + h2c->stream_cnt >= h2_fe_max_total_streams + h2c_max_concurrent_streams(h2c)) { + /* We've already told this client we were going to close a + * while ago and apparently it didn't care, so it's time to + * stop processing its requests for real. + */ + error = H2_ERR_ENHANCE_YOUR_CALM; + TRACE_STATE("Stream limit violated", H2_EV_STRM_SHUT, h2c->conn); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + sess_log(h2c->conn->owner); + session_inc_http_req_ctr(h2c->conn->owner); + session_inc_http_err_ctr(h2c->conn->owner); + goto conn_err; + } + + error = h2c_dec_hdrs(h2c, &rxbuf, &flags, &body_len, NULL); + + if (error == 0) { + /* No error but missing data for demuxing, it is an incomplete frame */ + if (!(h2c->flags &H2_CF_DEM_BLOCK_ANY)) + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto out; + } + + /* Now we cannot roll back and we won't come back here anymore for this + * stream, so this stream ID is open from a protocol perspective, even + * if incomplete or broken, we want to count it as attempted. + */ + if (h2c->dsi > h2c->max_id) + h2c->max_id = h2c->dsi; + h2c->stream_cnt++; + + if (error < 0) { + /* Failed to decode this stream. This might be due to a + * recoverable error affecting only the stream (e.g. too large + * request for buffer, that leaves the HPACK decompressor still + * synchronized), or a non-recoverable error such as an invalid + * frame type sequence (e.g. other frame type interleaved with + * CONTINUATION), in which h2c_dec_hdrs() has already set the + * error code in the connection and counted it in the relevant + * stats. We still count a req error in both cases. + */ + sess_log(h2c->conn->owner); + session_inc_http_req_ctr(h2c->conn->owner); + session_inc_http_err_ctr(h2c->conn->owner); + + if (h2c->st0 >= H2_CS_ERROR) { + TRACE_USER("Unrecoverable error decoding H2 request", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, 0, &rxbuf); + goto out; + } + + /* recoverable stream error (e.g. too large request) */ + TRACE_USER("rcvd unparsable H2 request", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, h2s, &rxbuf); + goto strm_err; + } + + TRACE_USER("rcvd H2 request ", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW, h2c->conn, 0, &rxbuf); + + /* Note: we don't emit any other logs below because if we return + * positively from h2c_frt_stream_new(), the stream will report the error, + * and if we return in error, h2c_frt_stream_new() will emit the error. + * + * Xfer the rxbuf to the stream. On success, the new stream owns the + * rxbuf. On error, it is released here. + */ + h2s = h2c_frt_stream_new(h2c, h2c->dsi, &rxbuf, flags); + if (!h2s) { + h2s = (struct h2s*)h2_refused_stream; + TRACE_USER("refused H2 req. ", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, h2s, &rxbuf); + goto send_rst; + } + + h2s->st = H2_SS_OPEN; + h2s->flags |= flags; + h2s->body_len = body_len; + h2s_propagate_term_flags(h2c, h2s); + + done: + if (h2s->flags & H2_SF_ES_RCVD) { + if (h2s->st == H2_SS_OPEN) + h2s->st = H2_SS_HREM; + else + h2s_close(h2s); + } + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + goto leave; + + conn_err: + h2c_error(h2c, error); + out: + h2_release_buf(h2c, &rxbuf); + TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + h2s = NULL; + goto leave; + + strm_err: + h2s = (struct h2s*)h2_error_stream; + + send_rst: + /* make the demux send an RST for the current stream. We may only + * do this if we're certain that the HEADERS frame was properly + * decompressed so that the HPACK decoder is still kept up to date. + */ + h2_release_buf(h2c, &rxbuf); + h2c->st0 = H2_CS_FRAME_E; + + TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + + leave: + if (h2_fe_max_total_streams && h2c->stream_cnt >= h2_fe_max_total_streams) { + /* we've had enough streams on this connection, time to renew it. + * In order to gracefully do this, we'll advertise a stream limit + * of the current one plus the max concurrent streams value in the + * GOAWAY frame, so that we're certain that the client is aware of + * the limit before creating a new stream, but knows we won't harm + * the streams in flight. Remember that client stream IDs are odd + * so we apply twice the concurrent streams value to the current + * ID. + */ + if (h2c->last_sid <= 0 || + h2c->last_sid > h2c->max_id + 2 * h2c_max_concurrent_streams(h2c)) { + /* not set yet or was too high */ + h2c->last_sid = h2c->max_id + 2 * h2c_max_concurrent_streams(h2c); + h2c_send_goaway_error(h2c, NULL); + } + } + + return h2s; +} + +/* processes a HEADERS frame. Returns h2s on success or NULL on missing data. + * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the + * errors here are reported as connection errors since it's impossible to + * recover from such errors after the compression context has been altered. + */ +static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s) +{ + struct buffer rxbuf = BUF_NULL; + unsigned long long body_len = 0; + uint32_t flags = 0; + int error; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + + if (!b_size(&h2c->dbuf)) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto fail; // empty buffer + } + + if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf)) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto fail; // incomplete frame + } + + if (h2s->st != H2_SS_CLOSED) { + error = h2c_dec_hdrs(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len, h2s->upgrade_protocol); + } + else { + /* the connection was already killed by an RST, let's consume + * the data and send another RST. + */ + error = h2c_dec_hdrs(h2c, &rxbuf, &flags, &body_len, NULL); + h2s = (struct h2s*)h2_error_stream; + h2c->st0 = H2_CS_FRAME_E; + goto send_rst; + } + + /* unrecoverable error ? */ + if (h2c->st0 >= H2_CS_ERROR) { + TRACE_USER("Unrecoverable error decoding H2 HEADERS", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + goto fail; + } + + if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) { + /* RFC7540#5.1 */ + TRACE_ERROR("response HEADERS in invalid state", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + h2s_error(h2s, H2_ERR_STREAM_CLOSED); + h2c->st0 = H2_CS_FRAME_E; + HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err); + goto fail; + } + + if (error <= 0) { + if (error == 0) { + /* Demux not blocked because of the stream, it is an incomplete frame */ + if (!(h2c->flags &H2_CF_DEM_BLOCK_ANY)) + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto fail; // missing data + } + + /* stream error : send RST_STREAM */ + TRACE_ERROR("couldn't decode response HEADERS", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + h2s_error(h2s, H2_ERR_PROTOCOL_ERROR); + h2c->st0 = H2_CS_FRAME_E; + HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err); + goto fail; + } + + if (se_fl_test(h2s->sd, SE_FL_ERROR) && h2s->st < H2_SS_ERROR) + h2s->st = H2_SS_ERROR; + else if (h2s->flags & H2_SF_ES_RCVD) { + if (h2s->st == H2_SS_OPEN) + h2s->st = H2_SS_HREM; + else if (h2s->st == H2_SS_HLOC) + h2s_close(h2s); + } + + /* Unblock busy server h2s waiting for the response headers to validate + * the tunnel establishment or the end of the response of an oborted + * tunnel + */ + if ((h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_BLK_MBUSY)) == (H2_SF_BODY_TUNNEL|H2_SF_BLK_MBUSY) || + (h2s->flags & (H2_SF_TUNNEL_ABRT|H2_SF_ES_RCVD|H2_SF_BLK_MBUSY)) == (H2_SF_TUNNEL_ABRT|H2_SF_ES_RCVD|H2_SF_BLK_MBUSY)) { + TRACE_STATE("Unblock h2s blocked on tunnel establishment/abort", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + h2s->flags &= ~H2_SF_BLK_MBUSY; + } + + TRACE_USER("rcvd H2 response ", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, 0, &h2s->rxbuf); + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + return h2s; + fail: + TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + return NULL; + + send_rst: + /* make the demux send an RST for the current stream. We may only + * do this if we're certain that the HEADERS frame was properly + * decompressed so that the HPACK decoder is still kept up to date. + */ + h2_release_buf(h2c, &rxbuf); + h2c->st0 = H2_CS_FRAME_E; + + TRACE_USER("rejected H2 response", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, 0, &rxbuf); + TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + return h2s; +} + +/* processes a DATA frame. Returns > 0 on success or zero on missing data. + * It may return an error in h2c or h2s. Described in RFC7540#6.1. + */ +static int h2c_handle_data(struct h2c *h2c, struct h2s *h2s) +{ + int error; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + + /* note that empty DATA frames are perfectly valid and sometimes used + * to signal an end of stream (with the ES flag). + */ + + if (!b_size(&h2c->dbuf) && h2c->dfl) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto fail; // empty buffer + } + + if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf)) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + goto fail; // incomplete frame + } + + /* now either the frame is complete or the buffer is complete */ + + if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) { + /* RFC7540#6.1 */ + error = H2_ERR_STREAM_CLOSED; + goto strm_err; + } + + if (!(h2s->flags & H2_SF_HEADERS_RCVD)) { + /* RFC9113#8.1: The header section must be received before the message content */ + TRACE_ERROR("Unexpected DATA frame before the message headers", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + error = H2_ERR_PROTOCOL_ERROR; + HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err); + goto strm_err; + } + if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) { + /* RFC7540#8.1.2 */ + TRACE_ERROR("DATA frame larger than content-length", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + error = H2_ERR_PROTOCOL_ERROR; + HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err); + goto strm_err; + } + if (!(h2c->flags & H2_CF_IS_BACK) && + (h2s->flags & (H2_SF_TUNNEL_ABRT|H2_SF_ES_SENT)) == (H2_SF_TUNNEL_ABRT|H2_SF_ES_SENT) && + ((h2c->dfl - h2c->dpl) || !(h2c->dff & H2_F_DATA_END_STREAM))) { + /* a tunnel attempt was aborted but the client still try to send some raw data. + * Thus the stream is closed with the CANCEL error. Here we take care it is not + * an empty DATA Frame with the ES flag. The error is only handled if ES was + * already sent to the client because depending on the scheduling, these data may + * have been sent before the server response but not handle here. + */ + TRACE_ERROR("Request DATA frame for aborted tunnel", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + error = H2_ERR_CANCEL; + goto strm_err; + } + + if (!h2_frt_transfer_data(h2s)) + goto fail; + + /* call the upper layers to process the frame, then let the upper layer + * notify the stream about any change. + */ + if (!h2s_sc(h2s)) { + /* The upper layer has already closed, this may happen on + * 4xx/redirects during POST, or when receiving a response + * from an H2 server after the client has aborted. + */ + error = H2_ERR_CANCEL; + goto strm_err; + } + + if (h2c->st0 >= H2_CS_ERROR) + goto fail; + + if (h2s->st >= H2_SS_ERROR) { + /* stream error : send RST_STREAM */ + h2c->st0 = H2_CS_FRAME_E; + } + + /* check for completion : the callee will change this to FRAME_A or + * FRAME_H once done. + */ + if (h2c->st0 == H2_CS_FRAME_P) + goto fail; + + /* last frame */ + if (h2c->dff & H2_F_DATA_END_STREAM) { + h2s->flags |= H2_SF_ES_RCVD; + if (h2s->st == H2_SS_OPEN) + h2s->st = H2_SS_HREM; + else + h2s_close(h2s); + + if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) { + /* RFC7540#8.1.2 */ + TRACE_ERROR("ES on DATA frame before content-length", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + error = H2_ERR_PROTOCOL_ERROR; + HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err); + goto strm_err; + } + } + + /* Unblock busy server h2s waiting for the end of the response for an + * aborted tunnel + */ + if ((h2c->flags & H2_CF_IS_BACK) && + (h2s->flags & (H2_SF_TUNNEL_ABRT|H2_SF_ES_RCVD|H2_SF_BLK_MBUSY)) == (H2_SF_TUNNEL_ABRT|H2_SF_ES_RCVD|H2_SF_BLK_MBUSY)) { + TRACE_STATE("Unblock h2s blocked on tunnel abort", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + h2s->flags &= ~H2_SF_BLK_MBUSY; + } + + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + return 1; + + strm_err: + h2s_error(h2s, error); + h2c->st0 = H2_CS_FRAME_E; + fail: + TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + return 0; +} + +/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is + * valid for the current stream state. This is needed only after parsing the + * frame header but in practice it can be performed at any time during + * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success + * or 0 in case of error, in which case either h2s or h2c will carry an error. + */ +static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s) +{ + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s); + + if (h2s->st == H2_SS_IDLE && + h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) { + /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in + * this state MUST be treated as a connection error + */ + TRACE_ERROR("invalid frame type for IDLE state", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) { + /* only log if no other stream can report the error */ + sess_log(h2c->conn->owner); + } + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + TRACE_DEVEL("leaving in error (idle&!hdrs&!prio)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s); + return 0; + } + + if (h2s->st == H2_SS_IDLE && (h2c->flags & H2_CF_IS_BACK)) { + /* only PUSH_PROMISE would be permitted here */ + TRACE_ERROR("invalid frame type for IDLE state (back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + TRACE_DEVEL("leaving in error (idle&back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s); + return 0; + } + + if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE && + h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) { + /* RFC7540#5.1: any frame other than WU/PRIO/RST in + * this state MUST be treated as a stream error. + * 6.2, 6.6 and 6.10 further mandate that HEADERS/ + * PUSH_PROMISE/CONTINUATION cause connection errors. + */ + if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) { + TRACE_ERROR("invalid frame type for HREM state", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + } + else { + h2s_error(h2s, H2_ERR_STREAM_CLOSED); + } + TRACE_DEVEL("leaving in error (hrem&!wu&!rst&!prio)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s); + return 0; + } + + /* Below the management of frames received in closed state is a + * bit hackish because the spec makes strong differences between + * streams closed by receiving RST, sending RST, and seeing ES + * in both directions. In addition to this, the creation of a + * new stream reusing the identifier of a closed one will be + * detected here. Given that we cannot keep track of all closed + * streams forever, we consider that unknown closed streams were + * closed on RST received, which allows us to respond with an + * RST without breaking the connection (eg: to abort a transfer). + * Some frames have to be silently ignored as well. + */ + if (h2s->st == H2_SS_CLOSED && h2c->dsi) { + if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) { + /* #5.1.1: The identifier of a newly + * established stream MUST be numerically + * greater than all streams that the initiating + * endpoint has opened or reserved. This + * governs streams that are opened using a + * HEADERS frame and streams that are reserved + * using PUSH_PROMISE. An endpoint that + * receives an unexpected stream identifier + * MUST respond with a connection error. + */ + h2c_error(h2c, H2_ERR_STREAM_CLOSED); + TRACE_DEVEL("leaving in error (closed&hdrmask)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s); + return 0; + } + + if (h2s->flags & H2_SF_RST_RCVD && + !(h2_ft_bit(h2c->dft) & (H2_FT_HDR_MASK | H2_FT_RST_STREAM_BIT | H2_FT_PRIORITY_BIT | H2_FT_WINDOW_UPDATE_BIT))) { + /* RFC7540#5.1:closed: an endpoint that + * receives any frame other than PRIORITY after + * receiving a RST_STREAM MUST treat that as a + * stream error of type STREAM_CLOSED. + * + * Note that old streams fall into this category + * and will lead to an RST being sent. + * + * However, we cannot generalize this to all frame types. Those + * carrying compression state must still be processed before + * being dropped or we'll desynchronize the decoder. This can + * happen with request trailers received after sending an + * RST_STREAM, or with header/trailers responses received after + * sending RST_STREAM (aborted stream). + * + * In addition, since our CLOSED streams always carry the + * RST_RCVD bit, we don't want to accidentally catch valid + * frames for a closed stream, i.e. RST/PRIO/WU. + */ + h2s_error(h2s, H2_ERR_STREAM_CLOSED); + h2c->st0 = H2_CS_FRAME_E; + TRACE_DEVEL("leaving in error (rst_rcvd&!hdrmask)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s); + return 0; + } + + /* RFC7540#5.1:closed: if this state is reached as a + * result of sending a RST_STREAM frame, the peer that + * receives the RST_STREAM might have already sent + * frames on the stream that cannot be withdrawn. An + * endpoint MUST ignore frames that it receives on + * closed streams after it has sent a RST_STREAM + * frame. An endpoint MAY choose to limit the period + * over which it ignores frames and treat frames that + * arrive after this time as being in error. + */ + if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) { + /* RFC7540#5.1:closed: any frame other than + * PRIO/WU/RST in this state MUST be treated as + * a connection error + */ + if (h2c->dft != H2_FT_RST_STREAM && + h2c->dft != H2_FT_PRIORITY && + h2c->dft != H2_FT_WINDOW_UPDATE) { + h2c_error(h2c, H2_ERR_STREAM_CLOSED); + TRACE_DEVEL("leaving in error (rst_sent&!rst&!prio&!wu)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s); + return 0; + } + } + } + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s); + return 1; +} + +/* Reverse the connection <h2c>. Common operations are done for both active and + * passive reversal. Timeouts are inverted and H2_CF_IS_BACK is set or unset + * depending on the reversal direction. + * + * For active reversal, only minor steps are required. The connection should + * then be accepted by its listener before being able to use it for transfers. + * + * For passive reversal, connection is inserted in its targeted server idle + * pool. It can thus be reused immediately for future transfers on this server. + * + * Returns 1 on success else 0. + */ +static int h2_conn_reverse(struct h2c *h2c) +{ + struct connection *conn = h2c->conn; + + TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn); + + if (conn_reverse(conn)) { + TRACE_ERROR("reverse connection failed", H2_EV_H2C_WAKE, conn); + goto err; + } + + TRACE_USER("reverse connection", H2_EV_H2C_WAKE, conn); + + /* Check the connection new side after reversal. */ + if (conn_is_back(conn)) { + struct server *srv = __objt_server(h2c->conn->target); + struct proxy *prx = srv->proxy; + + h2c->flags |= H2_CF_IS_BACK; + + h2c->shut_timeout = h2c->timeout = prx->timeout.server; + if (tick_isset(prx->timeout.serverfin)) + h2c->shut_timeout = prx->timeout.serverfin; + + h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_be, + &h2_stats_module); + + HA_ATOMIC_OR(&h2c->wait_event.tasklet->state, TASK_F_USR1); + xprt_set_idle(conn, conn->xprt, conn->xprt_ctx); + if (!srv_add_to_idle_list(srv, conn, 1)) + goto err; + } + else { + struct listener *l = __objt_listener(h2c->conn->target); + struct proxy *prx = l->bind_conf->frontend; + + h2c->flags &= ~H2_CF_IS_BACK; + + h2c->shut_timeout = h2c->timeout = prx->timeout.client; + if (tick_isset(prx->timeout.clientfin)) + h2c->shut_timeout = prx->timeout.clientfin; + + h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_fe, + &h2_stats_module); + + proxy_inc_fe_cum_sess_ver_ctr(l, prx, 2); + + BUG_ON(LIST_INLIST(&h2c->conn->stopping_list)); + LIST_APPEND(&mux_stopping_data[tid].list, + &h2c->conn->stopping_list); + } + + /* Check if stream creation is initially forbidden. This is the case + * for active preconnect until reversal is done. + */ + if (conn_reverse_in_preconnect(h2c->conn)) { + TRACE_DEVEL("prevent stream demux until accept is done", H2_EV_H2C_WAKE, conn); + h2c->flags |= H2_CF_DEM_TOOMANY; + } + + /* If only the new side has a defined timeout, task must be allocated. + * On the contrary, if only old side has a timeout, it must be freed. + */ + if (!h2c->task && tick_isset(h2c->timeout)) { + h2c->task = task_new_here(); + if (!h2c->task) + goto err; + + h2c->task->process = h2_timeout_task; + h2c->task->context = h2c; + } + else if (!tick_isset(h2c->timeout)) { + task_destroy(h2c->task); + h2c->task = NULL; + } + + /* Requeue task if instantiated with the new timeout value. */ + if (h2c->task) { + h2c->task->expire = tick_add(now_ms, h2c->timeout); + task_queue(h2c->task); + } + + TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn); + return 1; + + err: + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + TRACE_DEVEL("leaving on error", H2_EV_H2C_WAKE); + return 0; +} + +/* process Rx frames to be demultiplexed */ +static void h2_process_demux(struct h2c *h2c) +{ + struct h2s *h2s = NULL, *tmp_h2s; + struct h2_fh hdr; + unsigned int padlen = 0; + int32_t old_iw = h2c->miw; + + TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn); + + if (h2c->st0 >= H2_CS_ERROR) + goto out; + + if (unlikely(h2c->st0 < H2_CS_FRAME_H)) { + if (h2c->st0 == H2_CS_PREFACE) { + TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn); + if (h2c->flags & H2_CF_IS_BACK) + goto out; + + if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) { + /* RFC7540#3.5: a GOAWAY frame MAY be omitted */ + if (h2c->st0 == H2_CS_ERROR) { + TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn); + h2c->st0 = H2_CS_ERROR2; + if (b_data(&h2c->dbuf) || + !(((const struct session *)h2c->conn->owner)->fe->options & (PR_O_NULLNOLOG|PR_O_IGNORE_PRB))) + sess_log(h2c->conn->owner); + } + goto done; + } + TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn); + + h2c->max_id = 0; + TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn); + h2c->st0 = H2_CS_SETTINGS1; + } + + if (h2c->st0 == H2_CS_SETTINGS1) { + /* ensure that what is pending is a valid SETTINGS frame + * without an ACK. + */ + TRACE_STATE("expecting settings", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS, h2c->conn); + if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) { + /* RFC7540#3.5: a GOAWAY frame MAY be omitted */ + h2c->flags |= H2_CF_DEM_SHORT_READ; + if (h2c->st0 == H2_CS_ERROR) { + TRACE_ERROR("failed to receive settings", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn); + h2c->st0 = H2_CS_ERROR2; + if (!(h2c->flags & H2_CF_IS_BACK)) + sess_log(h2c->conn->owner); + } + goto done; + } + + if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) { + /* RFC7540#3.5: a GOAWAY frame MAY be omitted */ + TRACE_ERROR("unexpected frame type or flags", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + h2c->st0 = H2_CS_ERROR2; + if (!(h2c->flags & H2_CF_IS_BACK)) + sess_log(h2c->conn->owner); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto done; + } + + if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) { + /* RFC7540#3.5: a GOAWAY frame MAY be omitted */ + TRACE_ERROR("invalid settings frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR); + h2c->st0 = H2_CS_ERROR2; + if (!(h2c->flags & H2_CF_IS_BACK)) + sess_log(h2c->conn->owner); + goto done; + } + + /* that's OK, switch to FRAME_P to process it. This is + * a SETTINGS frame whose header has already been + * deleted above. + */ + padlen = 0; + HA_ATOMIC_INC(&h2c->px_counters->settings_rcvd); + goto new_frame; + } + } + + /* process as many incoming frames as possible below */ + while (1) { + int ret = 0; + + if (!b_data(&h2c->dbuf)) { + TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn); + h2c->flags |= H2_CF_DEM_SHORT_READ; + break; + } + + if (h2c->st0 >= H2_CS_ERROR) { + TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn); + break; + } + + if (h2c->st0 == H2_CS_FRAME_H) { + TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn); + if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr)) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + break; + } + + if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) { + TRACE_ERROR("invalid H2 frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR); + if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) { + /* only log if no other stream can report the error */ + sess_log(h2c->conn->owner); + } + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + break; + } + + if (h2c->rcvd_s && h2c->dsi != hdr.sid) { + /* changed stream with a pending WU, need to + * send it now. + */ + TRACE_PROTO("sending stream WINDOW_UPDATE frame on stream switch", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn); + ret = h2c_send_strm_wu(h2c); + if (ret <= 0) + break; + } + + padlen = 0; + if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) { + /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA), + * we read the pad length and drop it from the remaining + * payload (one byte + the 9 remaining ones = 10 total + * removed), so we have a frame payload starting after the + * pad len. Flow controlled frames (DATA) also count the + * padlen in the flow control, so it must be adjusted. + */ + if (hdr.len < 1) { + TRACE_ERROR("invalid H2 padded frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR); + if (!(h2c->flags & H2_CF_IS_BACK)) + sess_log(h2c->conn->owner); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto done; + } + hdr.len--; + + if (b_data(&h2c->dbuf) < 10) { + h2c->flags |= H2_CF_DEM_SHORT_READ; + break; // missing padlen + } + + padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9); + + if (padlen > hdr.len) { + TRACE_ERROR("invalid H2 padding length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn); + /* RFC7540#6.1 : pad length = length of + * frame payload or greater => error. + */ + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + if (!(h2c->flags & H2_CF_IS_BACK)) + sess_log(h2c->conn->owner); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto done; + } + + if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) { + h2c->rcvd_c++; + h2c->rcvd_s++; + } + b_del(&h2c->dbuf, 1); + } + h2_skip_frame_hdr(&h2c->dbuf); + + new_frame: + h2c->dfl = hdr.len; + h2c->dsi = hdr.sid; + h2c->dft = hdr.ft; + h2c->dff = hdr.ff; + h2c->dpl = padlen; + h2c->flags |= H2_CF_DEM_IN_PROGRESS; + TRACE_STATE("rcvd H2 frame header, switching to FRAME_P state", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn); + h2c->st0 = H2_CS_FRAME_P; + + /* check for minimum basic frame format validity */ + ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize); + if (ret != H2_ERR_NO_ERROR) { + TRACE_ERROR("received invalid H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, ret); + if (!(h2c->flags & H2_CF_IS_BACK)) + sess_log(h2c->conn->owner); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto done; + } + + /* transition to HEADERS frame ends the keep-alive idle + * timer and starts the http-request idle delay. It uses + * the idle_start timer as well. + */ + if (hdr.ft == H2_FT_HEADERS) + h2c->idle_start = now_ms; + } + + /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here. + * H2_CS_FRAME_P indicates an incomplete previous operation + * (most often the first attempt) and requires some validity + * checks for the frame and the current state. The two other + * ones are set after completion (or abortion) and must skip + * validity checks. + */ + tmp_h2s = h2c_st_by_id(h2c, h2c->dsi); + + if (tmp_h2s != h2s && h2s && h2s_sc(h2s) && + (b_data(&h2s->rxbuf) || + h2c_read0_pending(h2c) || + h2s->st == H2_SS_CLOSED || + (h2s->flags & H2_SF_ES_RCVD) || + se_fl_test(h2s->sd, SE_FL_ERROR | SE_FL_ERR_PENDING | SE_FL_EOS))) { + /* we may have to signal the upper layers */ + TRACE_DEVEL("notifying stream before switching SID", H2_EV_RX_FRAME|H2_EV_STRM_WAKE, h2c->conn, h2s); + se_fl_set(h2s->sd, SE_FL_RCV_MORE); + h2s_notify_recv(h2s); + } + h2s = tmp_h2s; + + if (h2c->st0 == H2_CS_FRAME_E || + (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) { + TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s); + goto strm_err; + } + + switch (h2c->dft) { + case H2_FT_SETTINGS: + if (h2c->st0 == H2_CS_FRAME_P) { + TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s); + ret = h2c_handle_settings(h2c); + } + HA_ATOMIC_INC(&h2c->px_counters->settings_rcvd); + + if (h2c->st0 == H2_CS_FRAME_A) { + TRACE_PROTO("sending H2 SETTINGS ACK frame", H2_EV_TX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s); + ret = h2c_ack_settings(h2c); + + if (ret > 0 && conn_is_reverse(h2c->conn)) { + /* Initiate connection reversal after SETTINGS reception. */ + ret = h2_conn_reverse(h2c); + } + } + break; + + case H2_FT_PING: + if (h2c->st0 == H2_CS_FRAME_P) { + TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s); + ret = h2c_handle_ping(h2c); + } + + if (h2c->st0 == H2_CS_FRAME_A) { + TRACE_PROTO("sending H2 PING ACK frame", H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn, h2s); + ret = h2c_ack_ping(h2c); + } + break; + + case H2_FT_WINDOW_UPDATE: + if (h2c->st0 == H2_CS_FRAME_P) { + TRACE_PROTO("receiving H2 WINDOW_UPDATE frame", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn, h2s); + ret = h2c_handle_window_update(h2c, h2s); + } + break; + + case H2_FT_CONTINUATION: + /* RFC7540#6.10: CONTINUATION may only be preceded by + * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These + * frames' parsers consume all following CONTINUATION + * frames so this one is out of sequence. + */ + TRACE_ERROR("received unexpected H2 CONTINUATION frame", H2_EV_RX_FRAME|H2_EV_RX_CONT|H2_EV_H2C_ERR, h2c->conn, h2s); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + if (!(h2c->flags & H2_CF_IS_BACK)) + sess_log(h2c->conn->owner); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto done; + + case H2_FT_HEADERS: + if (h2c->st0 == H2_CS_FRAME_P) { + TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s); + if (h2c->flags & H2_CF_IS_BACK) + tmp_h2s = h2c_bck_handle_headers(h2c, h2s); + else + tmp_h2s = h2c_frt_handle_headers(h2c, h2s); + if (tmp_h2s) { + h2s = tmp_h2s; + ret = 1; + } + } + HA_ATOMIC_INC(&h2c->px_counters->headers_rcvd); + break; + + case H2_FT_DATA: + if (h2c->st0 == H2_CS_FRAME_P) { + TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + ret = h2c_handle_data(h2c, h2s); + } + HA_ATOMIC_INC(&h2c->px_counters->data_rcvd); + + if (h2c->st0 == H2_CS_FRAME_A) { + /* rcvd_s will suffice to trigger the sending of a WU */ + h2c->st0 = H2_CS_FRAME_H; + } + break; + + case H2_FT_PRIORITY: + if (h2c->st0 == H2_CS_FRAME_P) { + TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s); + ret = h2c_handle_priority(h2c); + } + break; + + case H2_FT_RST_STREAM: + if (h2c->st0 == H2_CS_FRAME_P) { + TRACE_PROTO("receiving H2 RST_STREAM frame", H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s); + ret = h2c_handle_rst_stream(h2c, h2s); + } + HA_ATOMIC_INC(&h2c->px_counters->rst_stream_rcvd); + break; + + case H2_FT_GOAWAY: + if (h2c->st0 == H2_CS_FRAME_P) { + TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s); + ret = h2c_handle_goaway(h2c); + } + HA_ATOMIC_INC(&h2c->px_counters->goaway_rcvd); + break; + + /* implement all extra frame types here */ + default: + TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s); + /* drop frames that we ignore. They may be larger than + * the buffer so we drain all of their contents until + * we reach the end. + */ + ret = MIN(b_data(&h2c->dbuf), h2c->dfl); + b_del(&h2c->dbuf, ret); + h2c->dfl -= ret; + ret = h2c->dfl == 0; + } + + strm_err: + /* We may have to send an RST if not done yet */ + if (h2s->st == H2_SS_ERROR) { + TRACE_STATE("stream error, switching to FRAME_E", H2_EV_RX_FRAME|H2_EV_H2S_ERR, h2c->conn, h2s); + h2c->st0 = H2_CS_FRAME_E; + } + + if (h2c->st0 == H2_CS_FRAME_E) { + TRACE_PROTO("sending H2 RST_STREAM frame", H2_EV_TX_FRAME|H2_EV_TX_RST|H2_EV_TX_EOI, h2c->conn, h2s); + ret = h2c_send_rst_stream(h2c, h2s); + } + + /* error or missing data condition met above ? */ + if (ret <= 0) + break; + + if (h2c->st0 != H2_CS_FRAME_H) { + if (h2c->dfl) + TRACE_DEVEL("skipping remaining frame payload", H2_EV_RX_FRAME, h2c->conn, h2s); + ret = MIN(b_data(&h2c->dbuf), h2c->dfl); + b_del(&h2c->dbuf, ret); + h2c->dfl -= ret; + if (!h2c->dfl) { + h2c->flags &= ~H2_CF_DEM_IN_PROGRESS; + TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn); + h2c->st0 = H2_CS_FRAME_H; + } + } + } + + if (h2c->rcvd_s > 0 && + !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM))) { + TRACE_PROTO("sending stream WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn, h2s); + h2c_send_strm_wu(h2c); + } + + if (h2c->rcvd_c > 0 && + !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM))) { + TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn); + h2c_send_conn_wu(h2c); + } + + done: + if (h2c->st0 >= H2_CS_ERROR || (h2c->flags & H2_CF_DEM_SHORT_READ)) { + if (h2c->flags & H2_CF_RCVD_SHUT) + h2c->flags |= H2_CF_END_REACHED; + } + + if (h2s && h2s_sc(h2s) && + (b_data(&h2s->rxbuf) || + h2c_read0_pending(h2c) || + h2s->st == H2_SS_CLOSED || + (h2s->flags & H2_SF_ES_RCVD) || + se_fl_test(h2s->sd, SE_FL_ERROR | SE_FL_ERR_PENDING | SE_FL_EOS))) { + /* we may have to signal the upper layers */ + TRACE_DEVEL("notifying stream before switching SID", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn, h2s); + se_fl_set(h2s->sd, SE_FL_RCV_MORE); + h2s_notify_recv(h2s); + } + + if (old_iw != h2c->miw) { + TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn); + h2c_unblock_sfctl(h2c); + } + + h2c_restart_reading(h2c, 0); + out: + TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn); + return; +} + +/* resume each h2s eligible for sending in list head <head> */ +static void h2_resume_each_sending_h2s(struct h2c *h2c, struct list *head) +{ + struct h2s *h2s, *h2s_back; + + TRACE_ENTER(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn); + + list_for_each_entry_safe(h2s, h2s_back, head, list) { + if (h2c->mws <= 0 || + h2c->flags & H2_CF_MUX_BLOCK_ANY || + h2c->st0 >= H2_CS_ERROR) + break; + + h2s->flags &= ~H2_SF_BLK_ANY; + + if (h2s->flags & H2_SF_NOTIFIED) + continue; + + /* If the sender changed his mind and unsubscribed, let's just + * remove the stream from the send_list. + */ + if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) && + (!h2s->subs || !(h2s->subs->events & SUB_RETRY_SEND))) { + LIST_DEL_INIT(&h2s->list); + continue; + } + + if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) { + h2s->flags |= H2_SF_NOTIFIED; + tasklet_wakeup(h2s->subs->tasklet); + h2s->subs->events &= ~SUB_RETRY_SEND; + if (!h2s->subs->events) + h2s->subs = NULL; + } + else if (h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) { + tasklet_wakeup(h2s->shut_tl); + } + } + + TRACE_LEAVE(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn); +} + +/* removes a stream from the list it may be in. If a stream has recently been + * appended to the send_list, it might have been waiting on this one when + * entering h2_snd_buf() and expecting it to complete before starting to send + * in turn. For this reason we check (and clear) H2_CF_WAIT_INLIST to detect + * this condition, and we try to resume sending streams if it happens. Note + * that we don't need to do it for fctl_list as this list is relevant before + * (only consulted after) a window update on the connection, and not because + * of any competition with other streams. + */ +static inline void h2_remove_from_list(struct h2s *h2s) +{ + struct h2c *h2c = h2s->h2c; + + if (!LIST_INLIST(&h2s->list)) + return; + + LIST_DEL_INIT(&h2s->list); + if (h2c->flags & H2_CF_WAIT_INLIST) { + h2c->flags &= ~H2_CF_WAIT_INLIST; + h2_resume_each_sending_h2s(h2c, &h2c->send_list); + } +} + +/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached + * the end. + */ +static int h2_process_mux(struct h2c *h2c) +{ + TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn); + + if (unlikely(h2c->st0 < H2_CS_FRAME_H)) { + if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) { + if (unlikely(h2c_bck_send_preface(h2c) <= 0)) { + /* RFC7540#3.5: a GOAWAY frame MAY be omitted */ + if (h2c->st0 == H2_CS_ERROR) + h2c->st0 = H2_CS_ERROR2; + goto fail; + } + h2c->st0 = H2_CS_SETTINGS1; + } + /* need to wait for the other side */ + if (h2c->st0 < H2_CS_FRAME_H) + goto done; + } + + /* start by sending possibly pending window updates */ + if (h2c->rcvd_s > 0 && + !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) && + h2c_send_strm_wu(h2c) < 0) + goto fail; + + if (h2c->rcvd_c > 0 && + !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) && + h2c_send_conn_wu(h2c) < 0) + goto fail; + + /* First we always process the flow control list because the streams + * waiting there were already elected for immediate emission but were + * blocked just on this. + */ + h2c->flags &= ~H2_CF_WAIT_INLIST; + h2_resume_each_sending_h2s(h2c, &h2c->fctl_list); + h2_resume_each_sending_h2s(h2c, &h2c->send_list); + + fail: + if (unlikely(h2c->st0 >= H2_CS_ERROR)) { + if (h2c->st0 == H2_CS_ERROR) { + if (h2c->max_id >= 0) { + h2c_send_goaway_error(h2c, NULL); + if (h2c->flags & H2_CF_MUX_BLOCK_ANY) + goto out0; + } + + h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) ! + } + } + done: + TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn); + return 1; + out0: + TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn); + return 0; +} + + +/* Attempt to read data, and subscribe if none available. + * The function returns 1 if data has been received, otherwise zero. + */ +static int h2_recv(struct h2c *h2c) +{ + struct connection *conn = h2c->conn; + struct buffer *buf; + int max; + size_t ret; + + TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn); + + if (h2c->wait_event.events & SUB_RETRY_RECV) { + TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn); + return (b_data(&h2c->dbuf)); + } + + if (!h2_recv_allowed(h2c)) { + TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn); + return 1; + } + + buf = h2_get_buf(h2c, &h2c->dbuf); + if (!buf) { + h2c->flags |= H2_CF_DEM_DALLOC; + TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn); + return 0; + } + + if (!b_data(buf)) { + /* try to pre-align the buffer like the + * rxbufs will be to optimize memory copies. We'll make + * sure that the frame header lands at the end of the + * HTX block to alias it upon recv. We cannot use the + * head because rcv_buf() will realign the buffer if + * it's empty. Thus we cheat and pretend we already + * have a few bytes there. + */ + max = buf_room_for_htx_data(buf) + 9; + buf->head = sizeof(struct htx) - 9; + } + else + max = b_room(buf); + + ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0; + + if (max && !ret && h2_recv_allowed(h2c)) { + TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn); + conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event); + } else if (ret) { + TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn, 0, 0, (void*)(long)ret); + h2c->flags &= ~H2_CF_DEM_SHORT_READ; + } + + if (conn_xprt_read0_pending(h2c->conn)) { + TRACE_DATA("received read0", H2_EV_H2C_RECV, h2c->conn); + h2c->flags |= H2_CF_RCVD_SHUT; + } + if (h2c->conn->flags & CO_FL_ERROR && !b_data(&h2c->dbuf)) { + TRACE_DATA("connection error", H2_EV_H2C_RECV, h2c->conn); + h2c->flags |= H2_CF_ERROR; + } + + if (!b_data(buf)) { + h2_release_buf(h2c, &h2c->dbuf); + goto end; + } + + if (b_data(buf) == buf->size) { + h2c->flags |= H2_CF_DEM_DFULL; + TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn); + } + + end: + TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn); + return !!ret || (h2c->flags & (H2_CF_RCVD_SHUT|H2_CF_ERROR)); +} + +/* Try to send data if possible. + * The function returns 1 if data have been sent, otherwise zero. + */ +static int h2_send(struct h2c *h2c) +{ + struct connection *conn = h2c->conn; + int done; + int sent = 0; + + TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn); + + if (h2c->flags & (H2_CF_ERROR|H2_CF_ERR_PENDING)) { + TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn); + if (h2c->flags & H2_CF_END_REACHED) + h2c->flags |= H2_CF_ERROR; + b_reset(br_tail(h2c->mbuf)); + h2c->idle_start = now_ms; + return 1; + } + + /* This loop is quite simple : it tries to fill as much as it can from + * pending streams into the existing buffer until it's reportedly full + * or the end of send requests is reached. Then it tries to send this + * buffer's contents out, marks it not full if at least one byte could + * be sent, and tries again. + * + * The snd_buf() function normally takes a "flags" argument which may + * be made of a combination of CO_SFL_MSG_MORE to indicate that more + * data immediately comes and CO_SFL_STREAMER to indicate that the + * connection is streaming lots of data (used to increase TLS record + * size at the expense of latency). The former can be sent any time + * there's a buffer full flag, as it indicates at least one stream + * attempted to send and failed so there are pending data. An + * alternative would be to set it as long as there's an active stream + * but that would be problematic for ACKs until we have an absolute + * guarantee that all waiters have at least one byte to send. The + * latter should possibly not be set for now. + */ + + done = 0; + while (!(conn->flags & CO_FL_WAIT_XPRT) && !done) { + unsigned int flags = 0; + unsigned int released = 0; + struct buffer *buf; + uint to_send; + + /* fill as much as we can into the current buffer */ + while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done) + done = h2_process_mux(h2c); + + if (h2c->flags & H2_CF_MUX_MALLOC) + done = 1; // we won't go further without extra buffers + + if ((conn->flags & (CO_FL_SOCK_WR_SH|CO_FL_ERROR)) || + (h2c->flags & H2_CF_GOAWAY_FAILED)) + break; + + if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) + flags |= CO_SFL_MSG_MORE; + + to_send = br_count(h2c->mbuf); + if (to_send > 1) { + /* usually we want to emit small TLS records to speed + * up the decoding on the client. That's what is being + * done by default. However if there is more than one + * buffer being allocated, we're streaming large data + * so we stich to large records. + */ + flags |= CO_SFL_STREAMER; + } + + for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) { + if (b_data(buf)) { + int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), + flags | (to_send > 1 ? CO_SFL_MSG_MORE : 0)); + if (!ret) { + done = 1; + break; + } + sent = 1; + to_send--; + TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn, 0, buf, (void*)(long)ret); + b_del(buf, ret); + if (b_data(buf)) { + done = 1; + break; + } + } + b_free(buf); + released++; + } + + if (released) + offer_buffers(NULL, released); + + /* Normally if wrote at least one byte, the buffer is not full + * anymore. However, if it was marked full because all of its + * buffers were used, we don't want to instantly wake up many + * streams because we'd create a thundering herd effect, notably + * when data are flushed in small chunks. Instead we wait for + * the buffer to be decongested again before allowing to send + * again. It also has the added benefit of not pumping more + * data from the other side when it's known that this one is + * still congested. + */ + if (sent && br_single(h2c->mbuf)) + h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM); + } + + if (conn->flags & CO_FL_ERROR) { + h2c->flags |= H2_CF_ERR_PENDING; + if (h2c->flags & H2_CF_END_REACHED) + h2c->flags |= H2_CF_ERROR; + b_reset(br_tail(h2c->mbuf)); + } + + /* We're not full anymore, so we can wake any task that are waiting + * for us. + */ + if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H) { + h2c->flags &= ~H2_CF_WAIT_INLIST; + h2_resume_each_sending_h2s(h2c, &h2c->send_list); + } + + /* We're done, no more to send */ + if (!(conn->flags & CO_FL_WAIT_XPRT) && !br_data(h2c->mbuf)) { + TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn); + if (h2c->flags & H2_CF_MBUF_HAS_DATA && !h2c->nb_sc) { + h2c->flags &= ~H2_CF_MBUF_HAS_DATA; + h2c->idle_start = now_ms; + } + goto end; + } + + if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) { + TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn); + conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event); + } + TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn); +end: + return sent || (h2c->flags & (H2_CF_ERR_PENDING|H2_CF_ERROR)); +} + +/* this is the tasklet referenced in h2c->wait_event.tasklet */ +struct task *h2_io_cb(struct task *t, void *ctx, unsigned int state) +{ + struct connection *conn; + struct tasklet *tl = (struct tasklet *)t; + int conn_in_list; + struct h2c *h2c = ctx; + int ret = 0; + + if (state & TASK_F_USR1) { + /* the tasklet was idling on an idle connection, it might have + * been stolen, let's be careful! + */ + HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + if (t->context == NULL) { + /* The connection has been taken over by another thread, + * we're no longer responsible for it, so just free the + * tasklet, and do nothing. + */ + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + tasklet_free(tl); + t = NULL; + goto leave; + } + conn = h2c->conn; + TRACE_ENTER(H2_EV_H2C_WAKE, conn); + + /* Remove the connection from the list, to be sure nobody attempts + * to use it while we handle the I/O events + */ + conn_in_list = conn->flags & CO_FL_LIST_MASK; + if (conn_in_list) + conn_delete_from_tree(conn); + + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + } else { + /* we're certain the connection was not in an idle list */ + conn = h2c->conn; + TRACE_ENTER(H2_EV_H2C_WAKE, conn); + conn_in_list = 0; + } + + if (!(h2c->wait_event.events & SUB_RETRY_SEND)) + ret = h2_send(h2c); + if (!(h2c->wait_event.events & SUB_RETRY_RECV)) + ret |= h2_recv(h2c); + if (ret || b_data(&h2c->dbuf)) + ret = h2_process(h2c); + + /* If we were in an idle list, we want to add it back into it, + * unless h2_process() returned -1, which mean it has destroyed + * the connection (testing !ret is enough, if h2_process() wasn't + * called then ret will be 0 anyway. + */ + if (ret < 0) + t = NULL; + + if (!ret && conn_in_list) { + struct server *srv = objt_server(conn->target); + + HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + _srv_add_idle(srv, conn, conn_in_list == CO_FL_SAFE_LIST); + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + } + +leave: + TRACE_LEAVE(H2_EV_H2C_WAKE); + return t; +} + +/* callback called on any event by the connection handler. + * It applies changes and returns zero, or < 0 if it wants immediate + * destruction of the connection (which normally doesn not happen in h2). + */ +static int h2_process(struct h2c *h2c) +{ + struct connection *conn = h2c->conn; + + TRACE_ENTER(H2_EV_H2C_WAKE, conn); + + if (!(h2c->flags & H2_CF_DEM_BLOCK_ANY) && + (b_data(&h2c->dbuf) || (h2c->flags & H2_CF_RCVD_SHUT))) { + h2_process_demux(h2c); + + if (h2c->st0 >= H2_CS_ERROR || (h2c->flags & H2_CF_ERROR)) + b_reset(&h2c->dbuf); + + if (!b_full(&h2c->dbuf)) + h2c->flags &= ~H2_CF_DEM_DFULL; + } + h2_send(h2c); + + if (unlikely(h2c->proxy->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) && !(h2c->flags & H2_CF_IS_BACK)) { + int send_goaway = 1; + /* If a close-spread-time option is set, we want to avoid + * closing all the active HTTP2 connections at once so we add a + * random factor that will spread the closing. + */ + if (tick_isset(global.close_spread_end)) { + int remaining_window = tick_remain(now_ms, global.close_spread_end); + if (remaining_window) { + /* This should increase the closing rate the + * further along the window we are. */ + send_goaway = (remaining_window <= statistical_prng_range(global.close_spread_time)); + } + } + else if (global.tune.options & GTUNE_DISABLE_ACTIVE_CLOSE) + send_goaway = 0; /* let the client close his connection himself */ + /* frontend is stopping, reload likely in progress, let's try + * to announce a graceful shutdown if not yet done. We don't + * care if it fails, it will be tried again later. + */ + if (send_goaway) { + TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn); + if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) { + if (h2c->last_sid < 0) + h2c->last_sid = (1U << 31) - 1; + h2c_send_goaway_error(h2c, NULL); + } + } + } + + /* + * If we received early data, and the handshake is done, wake + * any stream that was waiting for it. + */ + if (!(h2c->flags & H2_CF_WAIT_FOR_HS) && + (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_WAIT_XPRT | CO_FL_EARLY_DATA)) == CO_FL_EARLY_DATA) { + struct eb32_node *node; + struct h2s *h2s; + + h2c->flags |= H2_CF_WAIT_FOR_HS; + node = eb32_lookup_ge(&h2c->streams_by_id, 1); + + while (node) { + h2s = container_of(node, struct h2s, by_id); + if (se_fl_test(h2s->sd, SE_FL_WAIT_FOR_HS)) + h2s_notify_recv(h2s); + node = eb32_next(node); + } + } + + if ((h2c->flags & H2_CF_ERROR) || h2c_read0_pending(h2c) || + h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED || + (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 && + h2c->max_id >= h2c->last_sid)) { + h2_wake_some_streams(h2c, 0); + + if (eb_is_empty(&h2c->streams_by_id)) { + /* no more stream, kill the connection now */ + h2_release(h2c); + TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE); + return -1; + } + + /* connections in error must be removed from the idle lists */ + if (conn->flags & CO_FL_LIST_MASK) { + HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + conn_delete_from_tree(conn); + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + } + } + else if (h2c->st0 == H2_CS_ERROR) { + /* connections in error must be removed from the idle lists */ + if (conn->flags & CO_FL_LIST_MASK) { + HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + conn_delete_from_tree(conn); + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + } + } + + if (!b_data(&h2c->dbuf)) + h2_release_buf(h2c, &h2c->dbuf); + + if (h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) || + (h2c->st0 != H2_CS_ERROR && + !br_data(h2c->mbuf) && + (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) && + ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list)))) + h2_release_mbuf(h2c); + + h2c_update_timeout(h2c); + h2_send(h2c); + TRACE_LEAVE(H2_EV_H2C_WAKE, conn); + return 0; +} + +/* wake-up function called by the connection layer (mux_ops.wake) */ +static int h2_wake(struct connection *conn) +{ + struct h2c *h2c = conn->ctx; + int ret; + + TRACE_ENTER(H2_EV_H2C_WAKE, conn); + ret = h2_process(h2c); + if (ret >= 0) { + h2_wake_some_streams(h2c, 0); + + /* For active reverse connection, an explicit check is required if an + * error is pending to propagate the error as demux process is blocked + * until reversal. This allows to quickly close the connection and + * prepare a new one. + */ + if (unlikely(conn_reverse_in_preconnect(conn)) && h2c_is_dead(h2c)) { + TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn); + h2_release(h2c); + } + } + + TRACE_LEAVE(H2_EV_H2C_WAKE); + return ret; +} + +/* Connection timeout management. The principle is that if there's no receipt + * nor sending for a certain amount of time, the connection is closed. If the + * MUX buffer still has lying data or is not allocatable, the connection is + * immediately killed. If it's allocatable and empty, we attempt to send a + * GOAWAY frame. + */ +struct task *h2_timeout_task(struct task *t, void *context, unsigned int state) +{ + struct h2c *h2c = context; + int expired = tick_is_expired(t->expire, now_ms); + + TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL); + + if (h2c) { + /* Make sure nobody stole the connection from us */ + HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + + /* Somebody already stole the connection from us, so we should not + * free it, we just have to free the task. + */ + if (!t->context) { + h2c = NULL; + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + goto do_leave; + } + + + if (!expired) { + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn); + return t; + } + + if (!h2c_may_expire(h2c)) { + /* we do still have streams but all of them are idle, waiting + * for the data layer, so we must not enforce the timeout here. + */ + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + t->expire = TICK_ETERNITY; + return t; + } + + /* We're about to destroy the connection, so make sure nobody attempts + * to steal it from us. + */ + if (h2c->conn->flags & CO_FL_LIST_MASK) + conn_delete_from_tree(h2c->conn); + + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + } + +do_leave: + task_destroy(t); + + if (!h2c) { + /* resources were already deleted */ + TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE); + return NULL; + } + + h2c->task = NULL; + h2c_error(h2c, H2_ERR_NO_ERROR); + h2_wake_some_streams(h2c, 0); + + if (br_data(h2c->mbuf)) { + /* don't even try to send a GOAWAY, the buffer is stuck */ + h2c->flags |= H2_CF_GOAWAY_FAILED; + } + + /* try to send but no need to insist */ + h2c->last_sid = h2c->max_id; + if (h2c_send_goaway_error(h2c, NULL) <= 0) + h2c->flags |= H2_CF_GOAWAY_FAILED; + + if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) { + unsigned int released = 0; + struct buffer *buf; + + for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) { + if (b_data(buf)) { + int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0); + if (!ret) + break; + b_del(buf, ret); + if (b_data(buf)) + break; + b_free(buf); + released++; + } + } + + if (released) + offer_buffers(NULL, released); + } + + /* in any case this connection must not be considered idle anymore */ + if (h2c->conn->flags & CO_FL_LIST_MASK) { + HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + conn_delete_from_tree(h2c->conn); + HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock); + } + + /* either we can release everything now or it will be done later once + * the last stream closes. + */ + if (eb_is_empty(&h2c->streams_by_id)) + h2_release(h2c); + + TRACE_LEAVE(H2_EV_H2C_WAKE); + return NULL; +} + + +/*******************************************/ +/* functions below are used by the streams */ +/*******************************************/ + +/* + * Attach a new stream to a connection + * (Used for outgoing connections) + */ +static int h2_attach(struct connection *conn, struct sedesc *sd, struct session *sess) +{ + struct h2s *h2s; + struct h2c *h2c = conn->ctx; + + TRACE_ENTER(H2_EV_H2S_NEW, conn); + h2s = h2c_bck_stream_new(h2c, sd->sc, sess); + if (!h2s) { + TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn); + return -1; + } + + /* the connection is not idle anymore, let's mark this */ + HA_ATOMIC_AND(&h2c->wait_event.tasklet->state, ~TASK_F_USR1); + xprt_set_used(h2c->conn, h2c->conn->xprt, h2c->conn->xprt_ctx); + + TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s); + return 0; +} + +/* Retrieves the first valid stream connector from this connection, or returns + * NULL. We have to scan because we may have some orphan streams. It might be + * beneficial to scan backwards from the end to reduce the likeliness to find + * orphans. + */ +static struct stconn *h2_get_first_sc(const struct connection *conn) +{ + struct h2c *h2c = conn->ctx; + struct h2s *h2s; + struct eb32_node *node; + + node = eb32_first(&h2c->streams_by_id); + while (node) { + h2s = container_of(node, struct h2s, by_id); + if (h2s_sc(h2s)) + return h2s_sc(h2s); + node = eb32_next(node); + } + return NULL; +} + +static int h2_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output) +{ + int ret = 0; + struct h2c *h2c = conn->ctx; + + switch (mux_ctl) { + case MUX_CTL_STATUS: + /* Only consider the mux to be ready if we're done with + * the preface and settings, and we had no error. + */ + if (h2c->st0 >= H2_CS_FRAME_H && h2c->st0 < H2_CS_ERROR) + ret |= MUX_STATUS_READY; + return ret; + case MUX_CTL_EXIT_STATUS: + return MUX_ES_UNKNOWN; + + case MUX_CTL_REVERSE_CONN: + BUG_ON(h2c->flags & H2_CF_IS_BACK); + + TRACE_DEVEL("connection reverse done, restart demux", H2_EV_H2C_WAKE, h2c->conn); + h2c->flags &= ~H2_CF_DEM_TOOMANY; + tasklet_wakeup(h2c->wait_event.tasklet); + return 0; + + default: + return -1; + } +} + +static int h2_sctl(struct stconn *sc, enum mux_sctl_type mux_sctl, void *output) +{ + int ret = 0; + struct h2s *h2s = __sc_mux_strm(sc); + + switch (mux_sctl) { + case MUX_SCTL_SID: + if (output) + *((int64_t *)output) = h2s->id; + return ret; + + default: + return -1; + } +} + +/* + * Destroy the mux and the associated connection, if it is no longer used + */ +static void h2_destroy(void *ctx) +{ + struct h2c *h2c = ctx; + + TRACE_ENTER(H2_EV_H2C_END, h2c->conn); + if (eb_is_empty(&h2c->streams_by_id)) { + BUG_ON(h2c->conn->ctx != h2c); + h2_release(h2c); + } + TRACE_LEAVE(H2_EV_H2C_END); +} + +/* + * Detach the stream from the connection and possibly release the connection. + */ +static void h2_detach(struct sedesc *sd) +{ + struct h2s *h2s = sd->se; + struct h2c *h2c; + struct session *sess; + + TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s); + + if (!h2s) { + TRACE_LEAVE(H2_EV_STRM_END); + return; + } + + /* there's no txbuf so we're certain not to be able to send anything */ + h2s->flags &= ~H2_SF_NOTIFIED; + + sess = h2s->sess; + h2c = h2s->h2c; + h2c->nb_sc--; + if (!h2c->nb_sc && !br_data(h2c->mbuf)) + h2c->idle_start = now_ms; + + if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY && + !h2_frt_has_too_many_sc(h2c)) { + /* frontend connection was blocking new streams creation */ + h2c->flags &= ~H2_CF_DEM_TOOMANY; + h2c_restart_reading(h2c, 1); + } + + /* this stream may be blocked waiting for some data to leave (possibly + * an ES or RST frame), so orphan it in this case. + */ + if (!(h2c->flags & (H2_CF_ERR_PENDING|H2_CF_ERROR)) && + (h2c->st0 < H2_CS_ERROR) && + (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) && + ((h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) || h2s->subs)) { + TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s); + /* refresh the timeout if none was active, so that the last + * leaving stream may arm it. + */ + if (h2c->task && !tick_isset(h2c->task->expire)) + h2c_update_timeout(h2c); + return; + } + + if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi)) { + /* unblock the connection if it was blocked on this + * stream. + */ + h2c->flags &= ~H2_CF_DEM_BLOCK_ANY; + h2c->flags &= ~H2_CF_MUX_BLOCK_ANY; + h2c_restart_reading(h2c, 1); + } + + h2s_destroy(h2s); + + if (h2c->flags & H2_CF_IS_BACK) { + if (!(h2c->flags & (H2_CF_RCVD_SHUT|H2_CF_ERR_PENDING|H2_CF_ERROR))) { + if (h2c->conn->flags & CO_FL_PRIVATE) { + /* Add the connection in the session server list, if not already done */ + if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) { + h2c->conn->owner = NULL; + if (eb_is_empty(&h2c->streams_by_id)) { + h2c->conn->mux->destroy(h2c); + TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR); + return; + } + } + if (eb_is_empty(&h2c->streams_by_id)) { + if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) { + /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */ + TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END); + return; + } + } + } + else { + if (eb_is_empty(&h2c->streams_by_id)) { + /* If the connection is owned by the session, first remove it + * from its list + */ + if (h2c->conn->owner) { + session_unown_conn(h2c->conn->owner, h2c->conn); + h2c->conn->owner = NULL; + } + + /* mark that the tasklet may lose its context to another thread and + * that the handler needs to check it under the idle conns lock. + */ + HA_ATOMIC_OR(&h2c->wait_event.tasklet->state, TASK_F_USR1); + xprt_set_idle(h2c->conn, h2c->conn->xprt, h2c->conn->xprt_ctx); + + if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn, 1)) { + /* The server doesn't want it, let's kill the connection right away */ + h2c->conn->mux->destroy(h2c); + TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR); + return; + } + /* At this point, the connection has been added to the + * server idle list, so another thread may already have + * hijacked it, so we can't do anything with it. + */ + TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END); + return; + + } + else if (!h2c->conn->hash_node->node.node.leaf_p && + h2_avail_streams(h2c->conn) > 0 && objt_server(h2c->conn->target) && + !LIST_INLIST(&h2c->conn->session_list)) { + srv_add_to_avail_list(__objt_server(h2c->conn->target), h2c->conn); + } + } + } + } + + /* We don't want to close right now unless we're removing the + * last stream, and either the connection is in error, or it + * reached the ID already specified in a GOAWAY frame received + * or sent (as seen by last_sid >= 0). + */ + if (h2c_is_dead(h2c)) { + /* no more stream will come, kill it now */ + TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn); + h2_release(h2c); + } + else if (h2c->task) { + h2c_update_timeout(h2c); + TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn); + } + else + TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn); +} + +/* Performs a synchronous or asynchronous shutr(). */ +static void h2_do_shutr(struct h2s *h2s) +{ + struct h2c *h2c = h2s->h2c; + + if (h2s->st == H2_SS_CLOSED) + goto done; + + TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s); + + if (h2s->flags & H2_SF_WANT_SHUTW) + goto add_to_list; + + /* a connstream may require us to immediately kill the whole connection + * for example because of a "tcp-request content reject" rule that is + * normally used to limit abuse. In this case we schedule a goaway to + * close the connection. + */ + if (se_fl_test(h2s->sd, SE_FL_KILL_CONN) && + !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) { + TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s); + h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM); + h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM); + } + else if (!(h2s->flags & H2_SF_HEADERS_SENT)) { + /* Nothing was never sent for this stream, so reset with + * REFUSED_STREAM error to let the client retry the + * request. + */ + TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s); + h2s_error(h2s, H2_ERR_REFUSED_STREAM); + } + else { + /* a final response was already provided, we don't want this + * stream anymore. This may happen when the server responds + * before the end of an upload and closes quickly (redirect, + * deny, ...) + */ + h2s_error(h2s, H2_ERR_CANCEL); + } + + if (!(h2s->flags & H2_SF_RST_SENT) && + h2s_send_rst_stream(h2c, h2s) <= 0) + goto add_to_list; + + if (!(h2c->wait_event.events & SUB_RETRY_SEND)) + tasklet_wakeup(h2c->wait_event.tasklet); + h2s_close(h2s); + done: + h2s->flags &= ~H2_SF_WANT_SHUTR; + TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s); + return; +add_to_list: + /* Let the handler know we want to shutr, and add ourselves to the + * most relevant list if not yet done. h2_deferred_shut() will be + * automatically called via the shut_tl tasklet when there's room + * again. + */ + h2s->flags |= H2_SF_WANT_SHUTR; + if (!LIST_INLIST(&h2s->list)) { + if (h2s->flags & H2_SF_BLK_MFCTL) + LIST_APPEND(&h2c->fctl_list, &h2s->list); + else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM)) + LIST_APPEND(&h2c->send_list, &h2s->list); + } + TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s); + return; +} + +/* Performs a synchronous or asynchronous shutw(). */ +static void h2_do_shutw(struct h2s *h2s) +{ + struct h2c *h2c = h2s->h2c; + + if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED) + goto done; + + TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s); + + if (h2s->st != H2_SS_ERROR && + (h2s->flags & (H2_SF_HEADERS_SENT | H2_SF_MORE_HTX_DATA)) == H2_SF_HEADERS_SENT) { + /* we can cleanly close using an empty data frame only after headers + * and if no more data is expected to be sent. + */ + if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) && + h2_send_empty_data_es(h2s) <= 0) + goto add_to_list; + + if (h2s->st == H2_SS_HREM) + h2s_close(h2s); + else + h2s->st = H2_SS_HLOC; + } else { + /* a connstream may require us to immediately kill the whole connection + * for example because of a "tcp-request content reject" rule that is + * normally used to limit abuse. In this case we schedule a goaway to + * close the connection. + */ + if (se_fl_test(h2s->sd, SE_FL_KILL_CONN) && + !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) { + TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s); + h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM); + h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM); + } + else if (h2s->flags & H2_SF_MORE_HTX_DATA) { + /* some unsent data were pending (e.g. abort during an upload), + * let's send a CANCEL. + */ + TRACE_STATE("shutw before end of data, sending CANCEL", H2_EV_STRM_SHUT, h2c->conn, h2s); + h2s_error(h2s, H2_ERR_CANCEL); + } + else { + /* Nothing was never sent for this stream, so reset with + * REFUSED_STREAM error to let the client retry the + * request. + */ + TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s); + h2s_error(h2s, H2_ERR_REFUSED_STREAM); + } + + if (!(h2s->flags & H2_SF_RST_SENT) && + h2s_send_rst_stream(h2c, h2s) <= 0) + goto add_to_list; + + h2s_close(h2s); + } + + if (!(h2c->wait_event.events & SUB_RETRY_SEND)) + tasklet_wakeup(h2c->wait_event.tasklet); + + TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s); + + done: + h2s->flags &= ~H2_SF_WANT_SHUTW; + return; + + add_to_list: + /* Let the handler know we want to shutw, and add ourselves to the + * most relevant list if not yet done. h2_deferred_shut() will be + * automatically called via the shut_tl tasklet when there's room + * again. + */ + h2s->flags |= H2_SF_WANT_SHUTW; + if (!LIST_INLIST(&h2s->list)) { + if (h2s->flags & H2_SF_BLK_MFCTL) + LIST_APPEND(&h2c->fctl_list, &h2s->list); + else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM)) + LIST_APPEND(&h2c->send_list, &h2s->list); + } + TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s); + return; +} + +/* This is the tasklet referenced in h2s->shut_tl, it is used for + * deferred shutdowns when the h2_detach() was done but the mux buffer was full + * and prevented the last frame from being emitted. + */ +struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned int state) +{ + struct h2s *h2s = ctx; + struct h2c *h2c = h2s->h2c; + + TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s); + + if (h2s->flags & H2_SF_NOTIFIED) { + /* some data processing remains to be done first */ + goto end; + } + + if (h2s->flags & H2_SF_WANT_SHUTW) + h2_do_shutw(h2s); + + if (h2s->flags & H2_SF_WANT_SHUTR) + h2_do_shutr(h2s); + + if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) { + /* We're done trying to send, remove ourself from the send_list */ + h2_remove_from_list(h2s); + + if (!h2s_sc(h2s)) { + h2s_destroy(h2s); + if (h2c_is_dead(h2c)) { + h2_release(h2c); + t = NULL; + } + } + } + end: + TRACE_LEAVE(H2_EV_STRM_SHUT); + return t; +} + +/* shutr() called by the stream connector (mux_ops.shutr) */ +static void h2_shutr(struct stconn *sc, enum co_shr_mode mode) +{ + struct h2s *h2s = __sc_mux_strm(sc); + + TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s); + if (mode) + h2_do_shutr(h2s); + TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s); +} + +/* shutw() called by the stream connector (mux_ops.shutw) */ +static void h2_shutw(struct stconn *sc, enum co_shw_mode mode) +{ + struct h2s *h2s = __sc_mux_strm(sc); + + TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s); + h2_do_shutw(h2s); + TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s); +} + +/* Decode the payload of a HEADERS frame and produce the HTX request or response + * depending on the connection's side. Returns a positive value on success, a + * negative value on failure, or 0 if it couldn't proceed. May report connection + * errors in h2c->errcode if the frame is non-decodable and the connection + * unrecoverable. In absence of connection error when a failure is reported, the + * caller must assume a stream error. + * + * The function may fold CONTINUATION frames into the initial HEADERS frame + * by removing padding and next frame header, then moving the CONTINUATION + * frame's payload and adjusting h2c->dfl to match the new aggregated frame, + * leaving a hole between the main frame and the beginning of the next one. + * The possibly remaining incomplete or next frame at the end may be moved + * if the aggregated frame is not deleted, in order to fill the hole. Wrapped + * HEADERS frames are unwrapped into a temporary buffer before decoding. + * + * A buffer at the beginning of processing may look like this : + * + * ,---.---------.-----.--------------.--------------.------.---. + * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///| + * `---^---------^-----^--------------^--------------^------^---' + * | | <-----> | | + * area | dpl | wrap + * |<--------------> | + * | dfl | + * |<-------------------------------------------------->| + * head data + * + * Padding is automatically overwritten when folding, participating to the + * hole size after dfl : + * + * ,---.------------------------.-----.--------------.------.---. + * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///| + * `---^------------------------^-----^--------------^------^---' + * | | <-----> | | + * area | hole | wrap + * |<-----------------------> | + * | dfl | + * |<-------------------------------------------------->| + * head data + * + * Please note that the HEADERS frame is always deprived from its PADLEN byte + * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY + * bit. + * + * The <flags> field must point to either the stream's flags or to a copy of it + * so that the function can update the following flags : + * - H2_SF_DATA_CLEN when content-length is seen + * - H2_SF_HEADERS_RCVD once the frame is successfully decoded + * + * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to + * decoding, in order to detect if we're dealing with a headers or a trailers + * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen). + */ +static int h2c_dec_hdrs(struct h2c *h2c, struct buffer *rxbuf, uint32_t *flags, unsigned long long *body_len, char *upgrade_protocol) +{ + const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf); + struct buffer *tmp = get_trash_chunk(); + struct http_hdr list[global.tune.max_http_hdr * 2]; + struct buffer *copy = NULL; + unsigned int msgf; + struct htx *htx = NULL; + int flen; // header frame len + int hole = 0; + int ret = 0; + int outlen; + int wrap; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn); + +next_frame: + if (b_data(&h2c->dbuf) - hole < h2c->dfl) + goto leave; // incomplete input frame + + /* No END_HEADERS means there's one or more CONTINUATION frames. In + * this case, we'll try to paste it immediately after the initial + * HEADERS frame payload and kill any possible padding. The initial + * frame's length will be increased to represent the concatenation + * of the two frames. The next frame is read from position <tlen> + * and written at position <flen> (minus padding if some is present). + */ + if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) { + struct h2_fh hdr; + int clen; // CONTINUATION frame's payload length + + TRACE_STATE("EH missing, expecting continuation frame", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_HDR, h2c->conn); + if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) { + /* no more data, the buffer may be full, either due to + * too large a frame or because of too large a hole that + * we're going to compact at the end. + */ + goto leave; + } + + if (hdr.ft != H2_FT_CONTINUATION) { + /* RFC7540#6.10: frame of unexpected type */ + TRACE_STATE("not continuation!", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_HDR|H2_EV_RX_CONT|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto fail; + } + + if (hdr.sid != h2c->dsi) { + /* RFC7540#6.10: frame of different stream */ + TRACE_STATE("different stream ID!", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_HDR|H2_EV_RX_CONT|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto fail; + } + + if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) { + /* RFC7540#4.2: invalid frame length */ + TRACE_STATE("too large frame!", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_HDR|H2_EV_RX_CONT|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR); + goto fail; + } + + /* detect when we must stop aggregating frames */ + h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS; + + /* Take as much as we can of the CONTINUATION frame's payload */ + clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9); + if (clen > hdr.len) + clen = hdr.len; + + /* Move the frame's payload over the padding, hole and frame + * header. At least one of hole or dpl is null (see diagrams + * above). The hole moves after the new aggregated frame. + */ + b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9)); + h2c->dfl += hdr.len - h2c->dpl; + hole += h2c->dpl + 9; + h2c->dpl = 0; + TRACE_STATE("waiting for next continuation frame", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_CONT|H2_EV_RX_HDR, h2c->conn); + goto next_frame; + } + + flen = h2c->dfl - h2c->dpl; + + /* if the input buffer wraps, take a temporary copy of it (rare) */ + wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf); + if (wrap < h2c->dfl) { + copy = alloc_trash_chunk(); + if (!copy) { + TRACE_DEVEL("failed to allocate temporary buffer", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + goto fail; + } + memcpy(copy->area, b_head(&h2c->dbuf), wrap); + memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap); + hdrs = (uint8_t *) copy->area; + } + + /* Skip StreamDep and weight for now (we don't support PRIORITY) */ + if (h2c->dff & H2_F_HEADERS_PRIORITY) { + if (read_n32(hdrs) == h2c->dsi) { + /* RFC7540#5.3.1 : stream dep may not depend on itself */ + TRACE_STATE("invalid stream dependency!", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto fail; + } + + if (flen < 5) { + TRACE_STATE("frame too short for priority!", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR); + goto fail; + } + + hdrs += 5; // stream dep = 4, weight = 1 + flen -= 5; + } + + if (!h2_get_buf(h2c, rxbuf)) { + TRACE_STATE("waiting for h2c rxbuf allocation", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_BLK, h2c->conn); + h2c->flags |= H2_CF_DEM_SALLOC; + goto leave; + } + + /* we can't retry a failed decompression operation so we must be very + * careful not to take any risks. In practice the output buffer is + * always empty except maybe for trailers, in which case we simply have + * to wait for the upper layer to finish consuming what is available. + */ + htx = htx_from_buf(rxbuf); + if (!htx_is_empty(htx)) { + TRACE_STATE("waiting for room in h2c rxbuf", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_BLK, h2c->conn); + h2c->flags |= H2_CF_DEM_SFULL; + goto leave; + } + + /* past this point we cannot roll back in case of error */ + outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list, + sizeof(list)/sizeof(list[0]), tmp); + + if (outlen > 0 && + (TRACE_SOURCE)->verbosity >= H2_VERB_ADVANCED && + TRACE_ENABLED(TRACE_LEVEL_USER, H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, 0, 0, 0)) { + struct ist n; + int i; + + for (i = 0; list[i].n.len; i++) { + n = list[i].n; + + if (!isttest(n)) { + /* this is in fact a pseudo header whose number is in n.len */ + n = h2_phdr_to_ist(n.len); + } + + h2_trace_header(n, list[i].v, H2_EV_RX_FRAME|H2_EV_RX_HDR, + ist(TRC_LOC), __FUNCTION__, h2c, NULL); + } + } + + if (outlen < 0) { + TRACE_STATE("failed to decompress HPACK", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_COMPRESSION_ERROR); + goto fail; + } + + /* The PACK decompressor was updated, let's update the input buffer and + * the parser's state to commit these changes and allow us to later + * fail solely on the stream if needed. + */ + b_del(&h2c->dbuf, h2c->dfl + hole); + h2c->dfl = hole = 0; + h2c->st0 = H2_CS_FRAME_H; + + /* OK now we have our header list in <list> */ + msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY; + msgf |= (*flags & H2_SF_BODY_TUNNEL) ? H2_MSGF_BODY_TUNNEL: 0; + /* If an Extended CONNECT has been sent on this stream, set message flag + * to convert 200 response to 101 htx response */ + msgf |= (*flags & H2_SF_EXT_CONNECT_SENT) ? H2_MSGF_EXT_CONNECT: 0; + + if (*flags & H2_SF_HEADERS_RCVD) + goto trailers; + + /* This is the first HEADERS frame so it's a headers block */ + if (h2c->flags & H2_CF_IS_BACK) + outlen = h2_make_htx_response(list, htx, &msgf, body_len, upgrade_protocol); + else + outlen = h2_make_htx_request(list, htx, &msgf, body_len, + !!(((const struct session *)h2c->conn->owner)->fe->options2 & PR_O2_REQBUG_OK)); + + if (outlen < 0 || htx_free_space(htx) < global.tune.maxrewrite) { + /* too large headers? this is a stream error only */ + TRACE_STATE("message headers too large or invalid", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2S_ERR|H2_EV_PROTO_ERR, h2c->conn); + htx->flags |= HTX_FL_PARSING_ERROR; + goto fail; + } + + if (msgf & H2_MSGF_BODY) { + /* a payload is present */ + if (msgf & H2_MSGF_BODY_CL) { + *flags |= H2_SF_DATA_CLEN; + htx->extra = *body_len; + } + } + if (msgf & H2_MSGF_BODYLESS_RSP) + *flags |= H2_SF_BODYLESS_RESP; + + if (msgf & H2_MSGF_BODY_TUNNEL) + *flags |= H2_SF_BODY_TUNNEL; + else { + /* Abort the tunnel attempt, if any */ + if (*flags & H2_SF_BODY_TUNNEL) + *flags |= H2_SF_TUNNEL_ABRT; + *flags &= ~H2_SF_BODY_TUNNEL; + } + + done: + /* indicate that a HEADERS frame was received for this stream, except + * for 1xx responses. For 1xx responses, another HEADERS frame is + * expected. + */ + if (!(msgf & H2_MSGF_RSP_1XX)) + *flags |= H2_SF_HEADERS_RCVD; + + if (h2c->dff & H2_F_HEADERS_END_STREAM) { + if (msgf & H2_MSGF_RSP_1XX) { + /* RFC9113#8.1 : HEADERS frame with the ES flag set that carries an informational status code is malformed */ + TRACE_STATE("invalid interim response with ES flag!", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn); + goto fail; + } + /* no more data are expected for this message */ + htx->flags |= HTX_FL_EOM; + *flags |= H2_SF_ES_RCVD; + } + + if (msgf & H2_MSGF_EXT_CONNECT) + *flags |= H2_SF_EXT_CONNECT_RCVD; + + /* success */ + ret = 1; + + leave: + /* If there is a hole left and it's not at the end, we are forced to + * move the remaining data over it. + */ + if (hole) { + if (b_data(&h2c->dbuf) > h2c->dfl + hole) + b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole), + b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole); + b_sub(&h2c->dbuf, hole); + } + + if (b_full(&h2c->dbuf) && h2c->dfl && (!htx || htx_is_empty(htx))) { + /* too large frames */ + h2c_error(h2c, H2_ERR_INTERNAL_ERROR); + ret = -1; + } + + if (htx) + htx_to_buf(htx, rxbuf); + free_trash_chunk(copy); + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn); + return ret; + + fail: + ret = -1; + goto leave; + + trailers: + /* This is the last HEADERS frame hence a trailer */ + if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) { + /* It's a trailer but it's missing ES flag */ + TRACE_STATE("missing EH on trailers frame", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn); + h2c_error(h2c, H2_ERR_PROTOCOL_ERROR); + HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err); + goto fail; + } + + /* Trailers terminate a DATA sequence */ + if (h2_make_htx_trailers(list, htx) <= 0) { + TRACE_STATE("failed to append HTX trailers into rxbuf", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2S_ERR, h2c->conn); + goto fail; + } + *flags |= H2_SF_ES_RCVD; + goto done; +} + +/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame + * parser state is automatically updated. Returns > 0 if it could completely + * send the current frame, 0 if it couldn't complete, in which case + * SE_FL_RCV_MORE must be checked to know if some data remain pending (an empty + * DATA frame can return 0 as a valid result). Stream errors are reported in + * h2s->errcode and connection errors in h2c->errcode. The caller must already + * have checked the frame header and ensured that the frame was complete or the + * buffer full. It changes the frame state to FRAME_A once done. + */ +static int h2_frt_transfer_data(struct h2s *h2s) +{ + struct h2c *h2c = h2s->h2c; + int block; + unsigned int flen = 0; + struct htx *htx = NULL; + struct buffer *scbuf; + unsigned int sent; + + TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + + h2c->flags &= ~H2_CF_DEM_SFULL; + + scbuf = h2_get_buf(h2c, &h2s->rxbuf); + if (!scbuf) { + h2c->flags |= H2_CF_DEM_SALLOC; + TRACE_STATE("waiting for an h2s rxbuf", H2_EV_RX_FRAME|H2_EV_RX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s); + goto fail; + } + htx = htx_from_buf(scbuf); + +try_again: + flen = h2c->dfl - h2c->dpl; + if (!flen) + goto end_transfer; + + if (flen > b_data(&h2c->dbuf)) { + flen = b_data(&h2c->dbuf); + if (!flen) + goto fail; + } + + block = htx_free_data_space(htx); + if (!block) { + h2c->flags |= H2_CF_DEM_SFULL; + TRACE_STATE("h2s rxbuf is full", H2_EV_RX_FRAME|H2_EV_RX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s); + goto fail; + } + if (flen > block) + flen = block; + + /* here, flen is the max we can copy into the output buffer */ + block = b_contig_data(&h2c->dbuf, 0); + if (flen > block) + flen = block; + + sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen)); + TRACE_DATA("move some data to h2s rxbuf", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s, 0, (void *)(long)sent); + + b_del(&h2c->dbuf, sent); + h2c->dfl -= sent; + h2c->rcvd_c += sent; + h2c->rcvd_s += sent; // warning, this can also affect the closed streams! + + if (h2s->flags & H2_SF_DATA_CLEN) { + h2s->body_len -= sent; + htx->extra = h2s->body_len; + } + + if (sent < flen) { + h2c->flags |= H2_CF_DEM_SFULL; + TRACE_STATE("h2s rxbuf is full", H2_EV_RX_FRAME|H2_EV_RX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s); + goto fail; + } + + goto try_again; + + end_transfer: + /* here we're done with the frame, all the payload (except padding) was + * transferred. + */ + + if (!(h2s->flags & H2_SF_BODY_TUNNEL) && (h2c->dff & H2_F_DATA_END_STREAM)) { + /* no more data are expected for this message. This add the EOM + * flag but only on the response path or if no tunnel attempt + * was aborted. Otherwise (request path + tunnel abrted), the + * EOM was already reported. + */ + if ((h2c->flags & H2_CF_IS_BACK) || !(h2s->flags & H2_SF_TUNNEL_ABRT)) { + /* htx may be empty if receiving an empty DATA frame. */ + if (!htx_set_eom(htx)) + goto fail; + } + } + + h2c->rcvd_c += h2c->dpl; + h2c->rcvd_s += h2c->dpl; + h2c->dpl = 0; + h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update + htx_to_buf(htx, scbuf); + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + return 1; + fail: + if (htx) + htx_to_buf(htx, scbuf); + TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + return 0; +} + +/* Try to send a HEADERS frame matching HTX response present in HTX message + * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller + * must check the stream's status to detect any error which might have happened + * subsequently to a successful send. The htx blocks are automatically removed + * from the message. The htx message is assumed to be valid since produced from + * the internal code, hence it contains a start line, an optional series of + * header blocks and an end of header, otherwise an invalid frame could be + * emitted and the resulting htx message could be left in an inconsistent state. + */ +static size_t h2s_snd_fhdrs(struct h2s *h2s, struct htx *htx) +{ + struct http_hdr list[global.tune.max_http_hdr]; + struct h2c *h2c = h2s->h2c; + struct htx_blk *blk; + struct buffer outbuf; + struct buffer *mbuf; + struct htx_sl *sl; + enum htx_blk_type type; + int es_now = 0; + int ret = 0; + int hdr; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s); + + /* get the start line (we do have one) and the rest of the headers, + * that we dump starting at header 0 */ + sl = NULL; + hdr = 0; + for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) { + type = htx_get_blk_type(blk); + + if (type == HTX_BLK_UNUSED) + continue; + + if (type == HTX_BLK_EOH) + break; + + if (type == HTX_BLK_HDR) { + BUG_ON(!sl); /* The start-line mut be defined before any headers */ + if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) { + TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + + list[hdr].n = htx_get_blk_name(htx, blk); + list[hdr].v = htx_get_blk_value(htx, blk); + hdr++; + } + else if (type == HTX_BLK_RES_SL) { + BUG_ON(sl); /* Only one start-line expected */ + sl = htx_get_blk_ptr(htx, blk); + h2s->status = sl->info.res.status; + if ((sl->flags & HTX_SL_F_BODYLESS_RESP) || h2s->status == 204 || h2s->status == 304) + h2s->flags |= H2_SF_BODYLESS_RESP; + if (h2s->status < 100 || h2s->status > 999) { + TRACE_ERROR("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + else if (h2s->status == 101) { + if (unlikely(h2s->flags & H2_SF_EXT_CONNECT_RCVD)) { + /* If an Extended CONNECT has been received, we need to convert 101 to 200 */ + h2s->status = 200; + h2s->flags &= ~H2_SF_EXT_CONNECT_RCVD; + } + else { + /* Otherwise, 101 responses are not supported in H2, so return a error (RFC7540#8.1.1) */ + TRACE_ERROR("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + } + else if ((h2s->flags & H2_SF_BODY_TUNNEL) && h2s->status >= 300) { + /* Abort the tunnel attempt */ + h2s->flags &= ~H2_SF_BODY_TUNNEL; + h2s->flags |= H2_SF_TUNNEL_ABRT; + } + } + else { + TRACE_ERROR("will not encode unexpected htx block", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + } + + /* The start-line me be defined */ + BUG_ON(!sl); + + /* marker for end of headers */ + list[hdr].n = ist(""); + + mbuf = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, mbuf)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2s->flags |= H2_SF_BLK_MROOM; + TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s); + return 0; + } + + chunk_reset(&outbuf); + + while (1) { + outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0); + if (outbuf.size >= 9 || !b_space_wraps(mbuf)) + break; + realign_again: + b_slow_realign(mbuf, trash.area, b_data(mbuf)); + } + + if (outbuf.size < 9) + goto full; + + /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */ + memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5); + write_n32(outbuf.area + 5, h2s->id); // 4 bytes + outbuf.data = 9; + + if ((h2c->flags & (H2_CF_SHTS_UPDATED|H2_CF_DTSU_EMITTED)) == H2_CF_SHTS_UPDATED) { + /* SETTINGS_HEADER_TABLE_SIZE changed, we must send an HPACK + * dynamic table size update so that some clients are not + * confused. In practice we only need to send the DTSU when the + * advertised size is lower than the current one, and since we + * don't use it and don't care about the default 4096 bytes, + * we only ack it with a zero size thus we at most have to deal + * with this once. See RFC7541#4.2 and #6.3 for the spec, and + * below for the whole context and interoperability risks: + * https://lists.w3.org/Archives/Public/ietf-http-wg/2021OctDec/0235.html + */ + if (b_room(&outbuf) < 1) + goto full; + outbuf.area[outbuf.data++] = 0x20; // HPACK DTSU 0 bytes + + /* let's not update the flags now but only once the buffer is + * really committed. + */ + } + + /* encode status, which necessarily is the first one */ + if (!hpack_encode_int_status(&outbuf, h2s->status)) { + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + + if ((TRACE_SOURCE)->verbosity >= H2_VERB_ADVANCED) { + char sts[4]; + + h2_trace_header(ist(":status"), ist(ultoa_r(h2s->status, sts, sizeof(sts))), + H2_EV_TX_FRAME|H2_EV_TX_HDR, ist(TRC_LOC), __FUNCTION__, + h2c, h2s); + } + + /* encode all headers, stop at empty name */ + for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) { + /* these ones do not exist in H2 and must be dropped. */ + if (isteq(list[hdr].n, ist("connection")) || + isteq(list[hdr].n, ist("proxy-connection")) || + isteq(list[hdr].n, ist("keep-alive")) || + isteq(list[hdr].n, ist("upgrade")) || + isteq(list[hdr].n, ist("transfer-encoding"))) + continue; + + /* Skip all pseudo-headers */ + if (*(list[hdr].n.ptr) == ':') + continue; + + if (isteq(list[hdr].n, ist(""))) + break; // end + + if (!h2_encode_header(&outbuf, list[hdr].n, list[hdr].v, H2_EV_TX_FRAME|H2_EV_TX_HDR, + ist(TRC_LOC), __FUNCTION__, h2c, h2s)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + } + + /* update the frame's size */ + h2_set_frame_size(outbuf.area, outbuf.data - 9); + + if (outbuf.data > h2c->mfs + 9) { + if (!h2_fragment_headers(&outbuf, h2c->mfs)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + } + + TRACE_USER("sent H2 response ", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx); + + /* remove all header blocks including the EOH and compute the + * corresponding size. + */ + ret = 0; + blk = htx_get_head_blk(htx); + while (blk) { + type = htx_get_blk_type(blk); + ret += htx_get_blksz(blk); + blk = htx_remove_blk(htx, blk); + /* The removed block is the EOH */ + if (type == HTX_BLK_EOH) + break; + } + + if (!h2s_sc(h2s) || se_fl_test(h2s->sd, SE_FL_SHW)) { + /* Response already closed: add END_STREAM */ + es_now = 1; + } + else if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx) && h2s->status >= 200) { + /* EOM+empty: we may need to add END_STREAM except for 1xx + * responses and tunneled response. + */ + if (!(h2s->flags & H2_SF_BODY_TUNNEL) || h2s->status >= 300) + es_now = 1; + } + + if (es_now) + outbuf.area[4] |= H2_F_HEADERS_END_STREAM; + + /* commit the H2 response */ + b_add(mbuf, outbuf.data); + h2c->flags |= H2_CF_MBUF_HAS_DATA; + + /* indicates the HEADERS frame was sent, except for 1xx responses. For + * 1xx responses, another HEADERS frame is expected. + */ + if (h2s->status >= 200) + h2s->flags |= H2_SF_HEADERS_SENT; + + if (h2c->flags & H2_CF_SHTS_UPDATED) { + /* was sent above */ + h2c->flags |= H2_CF_DTSU_EMITTED; + h2c->flags &= ~H2_CF_SHTS_UPDATED; + } + + if (es_now) { + h2s->flags |= H2_SF_ES_SENT; + TRACE_PROTO("setting ES on HEADERS frame", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx); + if (h2s->st == H2_SS_OPEN) + h2s->st = H2_SS_HLOC; + else + h2s_close(h2s); + } + + /* OK we could properly deliver the response */ + end: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s); + return ret; + full: + if ((mbuf = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + ret = 0; + TRACE_STATE("mux buffer full", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + fail: + /* unparsable HTX messages, too large ones to be produced in the local + * list etc go here (unrecoverable errors). + */ + h2s_error(h2s, H2_ERR_INTERNAL_ERROR); + ret = 0; + goto end; +} + +/* Try to send a HEADERS frame matching HTX request present in HTX message + * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller + * must check the stream's status to detect any error which might have happened + * subsequently to a successful send. The htx blocks are automatically removed + * from the message. The htx message is assumed to be valid since produced from + * the internal code, hence it contains a start line, an optional series of + * header blocks and an end of header, otherwise an invalid frame could be + * emitted and the resulting htx message could be left in an inconsistent state. + */ +static size_t h2s_snd_bhdrs(struct h2s *h2s, struct htx *htx) +{ + struct http_hdr list[global.tune.max_http_hdr]; + struct h2c *h2c = h2s->h2c; + struct htx_blk *blk; + struct buffer outbuf; + struct buffer *mbuf; + struct htx_sl *sl; + struct ist meth, uri, auth, host = IST_NULL; + enum htx_blk_type type; + int es_now = 0; + int ret = 0; + int hdr; + int extended_connect = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s); + + /* get the start line (we do have one) and the rest of the headers, + * that we dump starting at header 0 */ + sl = NULL; + hdr = 0; + for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) { + type = htx_get_blk_type(blk); + + if (type == HTX_BLK_UNUSED) + continue; + + if (type == HTX_BLK_EOH) + break; + + if (type == HTX_BLK_HDR) { + BUG_ON(!sl); /* The start-line mut be defined before any headers */ + if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) { + TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + + list[hdr].n = htx_get_blk_name(htx, blk); + list[hdr].v = htx_get_blk_value(htx, blk); + + /* Skip header if same name is used to add the server name */ + if ((h2c->flags & H2_CF_IS_BACK) && isttest(h2c->proxy->server_id_hdr_name) && + isteq(list[hdr].n, h2c->proxy->server_id_hdr_name)) + continue; + + /* Convert connection: upgrade to Extended connect from rfc 8441 */ + if ((sl->flags & HTX_SL_F_CONN_UPG) && isteqi(list[hdr].n, ist("connection"))) { + /* rfc 7230 #6.1 Connection = list of tokens */ + struct ist connection_ist = list[hdr].v; + do { + if (isteqi(iststop(connection_ist, ','), + ist("upgrade"))) { + if (!(h2c->flags & H2_CF_RCVD_RFC8441)) { + TRACE_STATE("reject upgrade because of no RFC8441 support", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s); + goto fail; + } + + TRACE_STATE("convert upgrade to extended connect method", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s); + h2s->flags |= (H2_SF_BODY_TUNNEL|H2_SF_EXT_CONNECT_SENT); + sl->info.req.meth = HTTP_METH_CONNECT; + meth = ist("CONNECT"); + + extended_connect = 1; + break; + } + + connection_ist = istadv(istfind(connection_ist, ','), 1); + } while (istlen(connection_ist)); + } + + if ((sl->flags & HTX_SL_F_CONN_UPG) && isteq(list[hdr].n, ist("upgrade"))) { + /* rfc 7230 #6.7 Upgrade = list of protocols + * rfc 8441 #4 Extended connect = :protocol is single-valued + * + * only first HTTP/1 protocol is preserved + */ + const struct ist protocol = iststop(list[hdr].v, ','); + /* upgrade_protocol field is 16 bytes long in h2s */ + istpad(h2s->upgrade_protocol, isttrim(protocol, 15)); + } + + if (isteq(list[hdr].n, ist("host"))) + host = list[hdr].v; + + hdr++; + } + else if (type == HTX_BLK_REQ_SL) { + BUG_ON(sl); /* Only one start-line expected */ + sl = htx_get_blk_ptr(htx, blk); + meth = htx_sl_req_meth(sl); + uri = htx_sl_req_uri(sl); + if ((sl->flags & HTX_SL_F_BODYLESS_RESP) || sl->info.req.meth == HTTP_METH_HEAD) + h2s->flags |= H2_SF_BODYLESS_RESP; + if (unlikely(uri.len == 0)) { + TRACE_ERROR("no URI in HTX request", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + } + else { + TRACE_ERROR("will not encode unexpected htx block", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + } + + /* The start-line me be defined */ + BUG_ON(!sl); + + /* Now add the server name to a header (if requested) */ + if ((h2c->flags & H2_CF_IS_BACK) && isttest(h2c->proxy->server_id_hdr_name)) { + struct server *srv = objt_server(h2c->conn->target); + + if (srv) { + list[hdr].n = h2c->proxy->server_id_hdr_name; + list[hdr].v = ist(srv->id); + hdr++; + } + } + + /* marker for end of headers */ + list[hdr].n = ist(""); + + mbuf = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, mbuf)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2s->flags |= H2_SF_BLK_MROOM; + TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s); + return 0; + } + + chunk_reset(&outbuf); + + while (1) { + outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0); + if (outbuf.size >= 9 || !b_space_wraps(mbuf)) + break; + realign_again: + b_slow_realign(mbuf, trash.area, b_data(mbuf)); + } + + if (outbuf.size < 9) + goto full; + + /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */ + memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5); + write_n32(outbuf.area + 5, h2s->id); // 4 bytes + outbuf.data = 9; + + /* encode the method, which necessarily is the first one */ + if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) { + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + + h2_trace_header(ist(":method"), meth, H2_EV_TX_FRAME|H2_EV_TX_HDR, ist(TRC_LOC), __FUNCTION__, h2c, h2s); + + auth = ist(NULL); + + /* RFC7540 #8.3: the CONNECT method must have : + * - :authority set to the URI part (host:port) + * - :method set to CONNECT + * - :scheme and :path omitted + * + * Note that this is not applicable in case of the Extended CONNECT + * protocol from rfc 8441. + */ + if (unlikely(sl->info.req.meth == HTTP_METH_CONNECT) && !extended_connect) { + auth = uri; + + if (!h2_encode_header(&outbuf, ist(":authority"), auth, H2_EV_TX_FRAME|H2_EV_TX_HDR, + ist(TRC_LOC), __FUNCTION__, h2c, h2s)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + + h2s->flags |= H2_SF_BODY_TUNNEL; + } else { + /* other methods need a :scheme. If an authority is known from + * the request line, it must be sent, otherwise only host is + * sent. Host is never sent as the authority. + * + * This code is also applicable for Extended CONNECT protocol + * from rfc 8441. + */ + struct ist scheme = { }; + + if (uri.ptr[0] != '/' && uri.ptr[0] != '*') { + /* the URI seems to start with a scheme */ + int len = 1; + + while (len < uri.len && uri.ptr[len] != ':') + len++; + + if (len + 2 < uri.len && uri.ptr[len + 1] == '/' && uri.ptr[len + 2] == '/') { + /* make the uri start at the authority now */ + scheme = ist2(uri.ptr, len); + uri = istadv(uri, len + 3); + + /* find the auth part of the URI */ + auth = ist2(uri.ptr, 0); + while (auth.len < uri.len && auth.ptr[auth.len] != '/') + auth.len++; + + uri = istadv(uri, auth.len); + } + } + + /* For Extended CONNECT, the :authority must be present. + * Use host value for it. + */ + if (unlikely(extended_connect) && isttest(host)) + auth = host; + + if (!scheme.len) { + /* no explicit scheme, we're using an origin-form URI, + * probably from an H1 request transcoded to H2 via an + * external layer, then received as H2 without authority. + * So we have to look up the scheme from the HTX flags. + * In such a case only http and https are possible, and + * https is the default (sent by browsers). + */ + if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) + scheme = ist("http"); + else + scheme = ist("https"); + } + + if (!hpack_encode_scheme(&outbuf, scheme)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + + if (auth.len && + !h2_encode_header(&outbuf, ist(":authority"), auth, H2_EV_TX_FRAME|H2_EV_TX_HDR, + ist(TRC_LOC), __FUNCTION__, h2c, h2s)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + + /* encode the path. RFC7540#8.1.2.3: if path is empty it must + * be sent as '/' or '*'. + */ + if (unlikely(!uri.len)) { + if (sl->info.req.meth == HTTP_METH_OPTIONS) + uri = ist("*"); + else + uri = ist("/"); + } + + if (!hpack_encode_path(&outbuf, uri)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + + h2_trace_header(ist(":path"), uri, H2_EV_TX_FRAME|H2_EV_TX_HDR, ist(TRC_LOC), __FUNCTION__, h2c, h2s); + + /* encode the pseudo-header protocol from rfc8441 if using + * Extended CONNECT method. + */ + if (unlikely(extended_connect)) { + const struct ist protocol = ist(h2s->upgrade_protocol); + if (isttest(protocol)) { + if (!h2_encode_header(&outbuf, ist(":protocol"), protocol, H2_EV_TX_FRAME|H2_EV_TX_HDR, + ist(TRC_LOC), __FUNCTION__, h2c, h2s)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + } + } + } + + /* encode all headers, stop at empty name. Host is only sent if we + * do not provide an authority. + */ + for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) { + struct ist n = list[hdr].n; + struct ist v = list[hdr].v; + + /* these ones do not exist in H2 and must be dropped. */ + if (isteq(n, ist("connection")) || + (auth.len && isteq(n, ist("host"))) || + isteq(n, ist("proxy-connection")) || + isteq(n, ist("keep-alive")) || + isteq(n, ist("upgrade")) || + isteq(n, ist("transfer-encoding"))) + continue; + + if (isteq(n, ist("te"))) { + /* "te" may only be sent with "trailers" if this value + * is present, otherwise it must be deleted. + */ + v = istist(v, ist("trailers")); + if (!isttest(v) || (v.len > 8 && v.ptr[8] != ',')) + continue; + v = ist("trailers"); + } + + /* Skip all pseudo-headers */ + if (*(n.ptr) == ':') + continue; + + if (isteq(n, ist(""))) + break; // end + + if (!h2_encode_header(&outbuf, n, v, H2_EV_TX_FRAME|H2_EV_TX_HDR, ist(TRC_LOC), __FUNCTION__, h2c, h2s)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + } + + /* update the frame's size */ + h2_set_frame_size(outbuf.area, outbuf.data - 9); + + if (outbuf.data > h2c->mfs + 9) { + if (!h2_fragment_headers(&outbuf, h2c->mfs)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + } + + TRACE_USER("sent H2 request ", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx); + + /* remove all header blocks including the EOH and compute the + * corresponding size. + */ + ret = 0; + blk = htx_get_head_blk(htx); + while (blk) { + type = htx_get_blk_type(blk); + ret += htx_get_blksz(blk); + blk = htx_remove_blk(htx, blk); + /* The removed block is the EOH */ + if (type == HTX_BLK_EOH) + break; + } + + if (!h2s_sc(h2s) || se_fl_test(h2s->sd, SE_FL_SHW)) { + /* Request already closed: add END_STREAM */ + es_now = 1; + } + if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx)) { + /* EOM+empty: we may need to add END_STREAM (except for CONNECT + * request) + */ + if (!(h2s->flags & H2_SF_BODY_TUNNEL)) + es_now = 1; + } + + if (es_now) + outbuf.area[4] |= H2_F_HEADERS_END_STREAM; + + /* commit the H2 response */ + b_add(mbuf, outbuf.data); + h2c->flags |= H2_CF_MBUF_HAS_DATA; + h2s->flags |= H2_SF_HEADERS_SENT; + h2s->st = H2_SS_OPEN; + + if (es_now) { + TRACE_PROTO("setting ES on HEADERS frame", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx); + // trim any possibly pending data (eg: inconsistent content-length) + h2s->flags |= H2_SF_ES_SENT; + h2s->st = H2_SS_HLOC; + } + + end: + return ret; + full: + if ((mbuf = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + ret = 0; + TRACE_STATE("mux buffer full", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + fail: + /* unparsable HTX messages, too large ones to be produced in the local + * list etc go here (unrecoverable errors). + */ + h2s_error(h2s, H2_ERR_INTERNAL_ERROR); + ret = 0; + goto end; +} + +/* Try to send a DATA frame matching HTTP response present in HTX structure + * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The + * caller must check the stream's status to detect any error which might have + * happened subsequently to a successful send. Returns the number of data bytes + * consumed, or zero if nothing done. + */ +static size_t h2s_make_data(struct h2s *h2s, struct buffer *buf, size_t count) +{ + struct h2c *h2c = h2s->h2c; + struct htx *htx; + struct buffer outbuf; + struct buffer *mbuf; + size_t total = 0; + int es_now = 0; + int bsize; /* htx block size */ + int fsize; /* h2 frame size */ + struct htx_blk *blk; + enum htx_blk_type type; + int trunc_out; /* non-zero if truncated on out buf */ + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + + htx = htx_from_buf(buf); + + /* We only come here with HTX_BLK_DATA blocks */ + + new_frame: + if (!count || htx_is_empty(htx)) + goto end; + + if ((h2c->flags & H2_CF_IS_BACK) && + (h2s->flags & (H2_SF_HEADERS_RCVD|H2_SF_BODY_TUNNEL)) == H2_SF_BODY_TUNNEL) { + /* The response HEADERS frame not received yet. Thus the tunnel + * is not fully established yet. In this situation, we block + * data sending. + */ + h2s->flags |= H2_SF_BLK_MBUSY; + TRACE_STATE("Request DATA frame blocked waiting for tunnel establishment", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + goto end; + } + else if ((h2c->flags & H2_CF_IS_BACK) && (h2s->flags & H2_SF_TUNNEL_ABRT)) { + /* a tunnel attempt was aborted but the is pending raw data to xfer to the server. + * Thus the stream is closed with the CANCEL error. The error will be reported to + * the upper layer as aserver abort. But at this stage there is nothing more we can + * do. We just wait for the end of the response to be sure to not truncate it. + */ + if (!(h2s->flags & H2_SF_ES_RCVD)) { + TRACE_STATE("Request DATA frame blocked waiting end of aborted tunnel", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + h2s->flags |= H2_SF_BLK_MBUSY; + } + else { + TRACE_ERROR("Request DATA frame for aborted tunnel", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s); + h2s_error(h2s, H2_ERR_CANCEL); + } + goto end; + } + + blk = htx_get_head_blk(htx); + type = htx_get_blk_type(blk); + bsize = htx_get_blksz(blk); + fsize = bsize; + trunc_out = 0; + if (type != HTX_BLK_DATA) + goto end; + + mbuf = br_tail(h2c->mbuf); + retry: + if (br_count(h2c->mbuf) > h2c->nb_streams) { + /* more buffers than streams allocated, pointless + * to continue, we'd use more RAM for no reason. + */ + h2s->flags |= H2_SF_BLK_MROOM; + TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + } + + if (!h2_get_buf(h2c, mbuf)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2s->flags |= H2_SF_BLK_MROOM; + TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + } + + /* Perform some optimizations to reduce the number of buffer copies. + * First, if the mux's buffer is empty and the htx area contains + * exactly one data block of the same size as the requested count, and + * this count fits within the frame size, the stream's window size, and + * the connection's window size, then it's possible to simply swap the + * caller's buffer with the mux's output buffer and adjust offsets and + * length to match the entire DATA HTX block in the middle. In this + * case we perform a true zero-copy operation from end-to-end. This is + * the situation that happens all the time with large files. Second, if + * this is not possible, but the mux's output buffer is empty, we still + * have an opportunity to avoid the copy to the intermediary buffer, by + * making the intermediary buffer's area point to the output buffer's + * area. In this case we want to skip the HTX header to make sure that + * copies remain aligned and that this operation remains possible all + * the time. This goes for headers, data blocks and any data extracted + * from the HTX blocks. + */ + if (unlikely(fsize == count && + htx_nbblks(htx) == 1 && type == HTX_BLK_DATA && + fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) { + void *old_area = mbuf->area; + + if (b_data(mbuf)) { + /* Too bad there are data left there. We're willing to memcpy/memmove + * up to 1/4 of the buffer, which means that it's OK to copy a large + * frame into a buffer containing few data if it needs to be realigned, + * and that it's also OK to copy few data without realigning. Otherwise + * we'll pretend the mbuf is full and wait for it to become empty. + */ + if (fsize + 9 <= b_room(mbuf) && + (b_data(mbuf) <= b_size(mbuf) / 4 || + (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) { + TRACE_STATE("small data present in output buffer, appending", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + goto copy; + } + + if ((mbuf = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + TRACE_STATE("too large data present in output buffer, waiting for emptiness", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + goto end; + } + + if (htx->flags & HTX_FL_EOM) { + /* EOM+empty: we may need to add END_STREAM (except for tunneled + * message) + */ + if (!(h2s->flags & H2_SF_BODY_TUNNEL)) + es_now = 1; + } + /* map an H2 frame to the HTX block so that we can put the + * frame header there. + */ + *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9); + outbuf.area = b_head(mbuf); + + /* prepend an H2 DATA frame header just before the DATA block */ + memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5); + write_n32(outbuf.area + 5, h2s->id); // 4 bytes + if (es_now) + outbuf.area[4] |= H2_F_DATA_END_STREAM; + h2_set_frame_size(outbuf.area, fsize); + + /* update windows */ + h2s->sws -= fsize; + h2c->mws -= fsize; + + /* and exchange with our old area */ + buf->area = old_area; + buf->data = buf->head = 0; + total += fsize; + fsize = 0; + h2c->flags |= H2_CF_MBUF_HAS_DATA; + + TRACE_PROTO("sent H2 DATA frame (zero-copy)", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + goto out; + } + + copy: + /* for DATA and EOM we'll have to emit a frame, even if empty */ + + while (1) { + outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0); + if (outbuf.size >= 9 || !b_space_wraps(mbuf)) + break; + realign_again: + b_slow_realign(mbuf, trash.area, b_data(mbuf)); + } + + if (outbuf.size < 9) { + if ((mbuf = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + goto end; + } + + /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */ + memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5); + write_n32(outbuf.area + 5, h2s->id); // 4 bytes + outbuf.data = 9; + + /* we have in <fsize> the exact number of bytes we need to copy from + * the HTX buffer. We need to check this against the connection's and + * the stream's send windows, and to ensure that this fits in the max + * frame size and in the buffer's available space minus 9 bytes (for + * the frame header). The connection's flow control is applied last so + * that we can use a separate list of streams which are immediately + * unblocked on window opening. Note: we don't implement padding. + */ + + if (!fsize) + goto send_empty; + + if (h2s_mws(h2s) <= 0) { + h2s->flags |= H2_SF_BLK_SFCTL; + if (LIST_INLIST(&h2s->list)) + h2_remove_from_list(h2s); + LIST_APPEND(&h2c->blocked_list, &h2s->list); + TRACE_STATE("stream window <=0, flow-controlled", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_H2S_FCTL, h2c->conn, h2s); + goto end; + } + + if (fsize > count) + fsize = count; + + if (fsize > h2s_mws(h2s)) + fsize = h2s_mws(h2s); // >0 + + if (h2c->mfs && fsize > h2c->mfs) + fsize = h2c->mfs; // >0 + + if (fsize + 9 > outbuf.size) { + /* It doesn't fit at once. If it at least fits once split and + * the amount of data to move is low, let's defragment the + * buffer now. + */ + if (b_space_wraps(mbuf) && + (fsize + 9 <= b_room(mbuf)) && + b_data(mbuf) <= MAX_DATA_REALIGN) + goto realign_again; + fsize = outbuf.size - 9; + trunc_out = 1; + + if (fsize <= 0) { + /* no need to send an empty frame here */ + if ((mbuf = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + goto end; + } + } + + if (h2c->mws <= 0) { + h2s->flags |= H2_SF_BLK_MFCTL; + TRACE_STATE("connection window <=0, stream flow-controlled", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_H2C_FCTL, h2c->conn, h2s); + goto end; + } + + if (fsize > h2c->mws) + fsize = h2c->mws; + + /* now let's copy this this into the output buffer */ + memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize); + h2s->sws -= fsize; + h2c->mws -= fsize; + count -= fsize; + + send_empty: + /* update the frame's size */ + h2_set_frame_size(outbuf.area, fsize); + + /* consume incoming HTX block */ + total += fsize; + if (fsize == bsize) { + htx_remove_blk(htx, blk); + if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx)) { + /* EOM+empty: we may need to add END_STREAM (except for tunneled + * message) + */ + if (!(h2s->flags & H2_SF_BODY_TUNNEL)) + es_now = 1; + } + } + else { + /* we've truncated this block */ + htx_cut_data_blk(htx, blk, fsize); + } + + if (es_now) + outbuf.area[4] |= H2_F_DATA_END_STREAM; + + /* commit the H2 response */ + b_add(mbuf, fsize + 9); + h2c->flags |= H2_CF_MBUF_HAS_DATA; + + out: + if (es_now) { + if (h2s->st == H2_SS_OPEN) + h2s->st = H2_SS_HLOC; + else + h2s_close(h2s); + + h2s->flags |= H2_SF_ES_SENT; + TRACE_PROTO("ES flag set on outgoing frame", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s); + } + else if (fsize) { + if (fsize == bsize) { + TRACE_DEVEL("more data may be available, trying to send another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + goto new_frame; + } + else if (trunc_out) { + /* we've truncated this block */ + goto new_frame; + } + } + + end: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + return total; +} + +/* Skip the message payload (DATA blocks) and emit an empty DATA frame with the + * ES flag set for stream <h2s>. This function is called for response known to + * have no payload. Only DATA blocks are skipped. This means the trailers are + * still emitted. The caller must check the stream's status to detect any error + * which might have happened subsequently to a successful send. Returns the + * number of data bytes consumed, or zero if nothing done. + */ +static size_t h2s_skip_data(struct h2s *h2s, struct buffer *buf, size_t count) +{ + struct h2c *h2c = h2s->h2c; + struct htx *htx; + int bsize; /* htx block size */ + int fsize; /* h2 frame size */ + struct htx_blk *blk; + enum htx_blk_type type; + size_t total = 0; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + + htx = htx_from_buf(buf); + + next_data: + if (!count || htx_is_empty(htx)) + goto end; + blk = htx_get_head_blk(htx); + type = htx_get_blk_type(blk); + bsize = htx_get_blksz(blk); + fsize = bsize; + if (type != HTX_BLK_DATA) + goto end; + + if (fsize > count) + fsize = count; + + if (fsize != bsize) + goto skip_data; + + if (!(htx->flags & HTX_FL_EOM) || !htx_is_unique_blk(htx, blk)) + goto skip_data; + + /* Here, it is the last block and it is also the end of the message. So + * we can emit an empty DATA frame with the ES flag set + */ + if (h2_send_empty_data_es(h2s) <= 0) + goto end; + + if (h2s->st == H2_SS_OPEN) + h2s->st = H2_SS_HLOC; + else + h2s_close(h2s); + + skip_data: + /* consume incoming HTX block */ + total += fsize; + if (fsize == bsize) { + TRACE_DEVEL("more data may be available, trying to skip another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + htx_remove_blk(htx, blk); + goto next_data; + } + else { + /* we've truncated this block */ + htx_cut_data_blk(htx, blk, fsize); + } + + end: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s); + return total; +} + +/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in + * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes + * processed. The caller must check the stream's status to detect any error + * which might have happened subsequently to a successful send. The htx blocks + * are automatically removed from the message. The htx message is assumed to be + * valid since produced from the internal code. Processing stops when meeting + * the EOT, which *is* removed. All trailers are processed at once and sent as a + * single frame. The ES flag is always set. + */ +static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx) +{ + struct http_hdr list[global.tune.max_http_hdr]; + struct h2c *h2c = h2s->h2c; + struct htx_blk *blk; + struct buffer outbuf; + struct buffer *mbuf; + enum htx_blk_type type; + int ret = 0; + int hdr; + int idx; + + TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s); + + /* get trailers. */ + hdr = 0; + for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) { + type = htx_get_blk_type(blk); + + if (type == HTX_BLK_UNUSED) + continue; + + if (type == HTX_BLK_EOT) + break; + if (type == HTX_BLK_TLR) { + if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) { + TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + + list[hdr].n = htx_get_blk_name(htx, blk); + list[hdr].v = htx_get_blk_value(htx, blk); + hdr++; + } + else { + TRACE_ERROR("will not encode unexpected htx block", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s); + goto fail; + } + } + + /* marker for end of trailers */ + list[hdr].n = ist(""); + + mbuf = br_tail(h2c->mbuf); + retry: + if (!h2_get_buf(h2c, mbuf)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2s->flags |= H2_SF_BLK_MROOM; + TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + } + + chunk_reset(&outbuf); + + while (1) { + outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0); + if (outbuf.size >= 9 || !b_space_wraps(mbuf)) + break; + realign_again: + b_slow_realign(mbuf, trash.area, b_data(mbuf)); + } + + if (outbuf.size < 9) + goto full; + + /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */ + memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5); + write_n32(outbuf.area + 5, h2s->id); // 4 bytes + outbuf.data = 9; + + /* encode all headers */ + for (idx = 0; idx < hdr; idx++) { + /* these ones do not exist in H2 or must not appear in + * trailers and must be dropped. + */ + if (isteq(list[idx].n, ist("host")) || + isteq(list[idx].n, ist("content-length")) || + isteq(list[idx].n, ist("connection")) || + isteq(list[idx].n, ist("proxy-connection")) || + isteq(list[idx].n, ist("keep-alive")) || + isteq(list[idx].n, ist("upgrade")) || + isteq(list[idx].n, ist("te")) || + isteq(list[idx].n, ist("transfer-encoding"))) + continue; + + /* Skip all pseudo-headers */ + if (*(list[idx].n.ptr) == ':') + continue; + + if (!h2_encode_header(&outbuf, list[idx].n, list[idx].v, H2_EV_TX_FRAME|H2_EV_TX_HDR, + ist(TRC_LOC), __FUNCTION__, h2c, h2s)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + } + + if (outbuf.data == 9) { + /* here we have a problem, we have nothing to emit (either we + * received an empty trailers block followed or we removed its + * contents above). Because of this we can't send a HEADERS + * frame, so we have to cheat and instead send an empty DATA + * frame conveying the ES flag. + */ + outbuf.area[3] = H2_FT_DATA; + outbuf.area[4] = H2_F_DATA_END_STREAM; + } + + /* update the frame's size */ + h2_set_frame_size(outbuf.area, outbuf.data - 9); + + if (outbuf.data > h2c->mfs + 9) { + if (!h2_fragment_headers(&outbuf, h2c->mfs)) { + /* output full */ + if (b_space_wraps(mbuf)) + goto realign_again; + goto full; + } + } + + /* commit the H2 response */ + TRACE_PROTO("sent H2 trailers HEADERS frame", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_TX_EOI, h2c->conn, h2s); + b_add(mbuf, outbuf.data); + h2c->flags |= H2_CF_MBUF_HAS_DATA; + h2s->flags |= H2_SF_ES_SENT; + + if (h2s->st == H2_SS_OPEN) + h2s->st = H2_SS_HLOC; + else + h2s_close(h2s); + + /* OK we could properly deliver the response */ + done: + /* remove all header blocks till the end and compute the corresponding size. */ + ret = 0; + blk = htx_get_head_blk(htx); + while (blk) { + type = htx_get_blk_type(blk); + ret += htx_get_blksz(blk); + blk = htx_remove_blk(htx, blk); + /* The removed block is the EOT */ + if (type == HTX_BLK_EOT) + break; + } + + end: + TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s); + return ret; + full: + if ((mbuf = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + ret = 0; + TRACE_STATE("mux buffer full", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + fail: + /* unparsable HTX messages, too large ones to be produced in the local + * list etc go here (unrecoverable errors). + */ + h2s_error(h2s, H2_ERR_INTERNAL_ERROR); + ret = 0; + goto end; +} + +/* Called from the upper layer, to subscribe <es> to events <event_type>. The + * event subscriber <es> is not allowed to change from a previous call as long + * as at least one event is still subscribed. The <event_type> must only be a + * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0. + */ +static int h2_subscribe(struct stconn *sc, int event_type, struct wait_event *es) +{ + struct h2s *h2s = __sc_mux_strm(sc); + struct h2c *h2c = h2s->h2c; + + TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s); + + BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV)); + BUG_ON(h2s->subs && h2s->subs != es); + + es->events |= event_type; + h2s->subs = es; + + if (event_type & SUB_RETRY_RECV) + TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s); + + if (event_type & SUB_RETRY_SEND) { + TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s); + if (!(h2s->flags & H2_SF_BLK_SFCTL) && + !LIST_INLIST(&h2s->list)) { + if (h2s->flags & H2_SF_BLK_MFCTL) { + TRACE_DEVEL("Adding to fctl list", H2_EV_STRM_SEND, h2c->conn, h2s); + LIST_APPEND(&h2c->fctl_list, &h2s->list); + } + else { + TRACE_DEVEL("Adding to send list", H2_EV_STRM_SEND, h2c->conn, h2s); + LIST_APPEND(&h2c->send_list, &h2s->list); + } + } + } + TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s); + return 0; +} + +/* Called from the upper layer, to unsubscribe <es> from events <event_type>. + * The <es> pointer is not allowed to differ from the one passed to the + * subscribe() call. It always returns zero. + */ +static int h2_unsubscribe(struct stconn *sc, int event_type, struct wait_event *es) +{ + struct h2s *h2s = __sc_mux_strm(sc); + + TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s); + + BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV)); + BUG_ON(h2s->subs && h2s->subs != es); + + es->events &= ~event_type; + if (!es->events) + h2s->subs = NULL; + + if (event_type & SUB_RETRY_RECV) + TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s); + + if (event_type & SUB_RETRY_SEND) { + TRACE_DEVEL("unsubscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s); + h2s->flags &= ~H2_SF_NOTIFIED; + if (!(h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW))) + h2_remove_from_list(h2s); + } + + TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s); + return 0; +} + + +/* Called from the upper layer, to receive data + * + * The caller is responsible for defragmenting <buf> if necessary. But <flags> + * must be tested to know the calling context. If CO_RFL_BUF_FLUSH is set, it + * means the caller wants to flush input data (from the mux buffer and the + * channel buffer) to be able to use kernel splicing or any kind of mux-to-mux + * xfer. If CO_RFL_KEEP_RECV is set, the mux must always subscribe for read + * events before giving back. CO_RFL_BUF_WET is set if <buf> is congested with + * data scheduled for leaving soon. CO_RFL_BUF_NOT_STUCK is set to instruct the + * mux it may optimize the data copy to <buf> if necessary. Otherwise, it should + * copy as much data as possible. + */ +static size_t h2_rcv_buf(struct stconn *sc, struct buffer *buf, size_t count, int flags) +{ + struct h2s *h2s = __sc_mux_strm(sc); + struct h2c *h2c = h2s->h2c; + struct htx *h2s_htx = NULL; + struct htx *buf_htx = NULL; + size_t ret = 0; + + TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s); + + /* transfer possibly pending data to the upper layer */ + h2s_htx = htx_from_buf(&h2s->rxbuf); + if (htx_is_empty(h2s_htx) && !(h2s_htx->flags & HTX_FL_PARSING_ERROR)) { + /* Here htx_to_buf() will set buffer data to 0 because + * the HTX is empty. + */ + htx_to_buf(h2s_htx, &h2s->rxbuf); + goto end; + } + ret = h2s_htx->data; + buf_htx = htx_from_buf(buf); + + /* <buf> is empty and the message is small enough, swap the + * buffers. */ + if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) { + htx_to_buf(buf_htx, buf); + htx_to_buf(h2s_htx, &h2s->rxbuf); + b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf)); + goto end; + } + + htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_UNUSED); + + if (h2s_htx->flags & HTX_FL_PARSING_ERROR) { + buf_htx->flags |= HTX_FL_PARSING_ERROR; + if (htx_is_empty(buf_htx)) + se_fl_set(h2s->sd, SE_FL_EOI); + } + else if (htx_is_empty(h2s_htx)) { + buf_htx->flags |= (h2s_htx->flags & HTX_FL_EOM); + } + + buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0); + htx_to_buf(buf_htx, buf); + htx_to_buf(h2s_htx, &h2s->rxbuf); + ret -= h2s_htx->data; + + end: + if (b_data(&h2s->rxbuf)) + se_fl_set(h2s->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + else { + if (!(h2c->flags & H2_CF_IS_BACK) && (h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_ES_RCVD))) { + /* If request ES is reported to the upper layer, it means the + * H2S now expects data from the opposite side. + */ + se_expect_data(h2s->sd); + } + + se_fl_clr(h2s->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + h2s_propagate_term_flags(h2c, h2s); + if (b_size(&h2s->rxbuf)) { + b_free(&h2s->rxbuf); + offer_buffers(NULL, 1); + } + } + + if (ret && h2c->dsi == h2s->id) { + /* demux is blocking on this stream's buffer */ + h2c->flags &= ~H2_CF_DEM_SFULL; + h2c_restart_reading(h2c, 1); + } + + TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s); + return ret; +} + + +/* Called from the upper layer, to send data from buffer <buf> for no more than + * <count> bytes. Returns the number of bytes effectively sent. Some status + * flags may be updated on the stream connector. + */ +static size_t h2_snd_buf(struct stconn *sc, struct buffer *buf, size_t count, int flags) +{ + struct h2s *h2s = __sc_mux_strm(sc); + size_t total = 0; + size_t ret; + struct htx *htx; + struct htx_blk *blk; + enum htx_blk_type btype; + uint32_t bsize; + int32_t idx; + + TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s); + + /* If we were not just woken because we wanted to send but couldn't, + * and there's somebody else that is waiting to send, do nothing, + * we will subscribe later and be put at the end of the list + */ + if (!(h2s->flags & H2_SF_NOTIFIED) && + (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) { + if (LIST_INLIST(&h2s->list)) + TRACE_DEVEL("stream already waiting, leaving", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2s->h2c->conn, h2s); + else { + TRACE_DEVEL("other streams already waiting, going to the queue and leaving", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2s->h2c->conn, h2s); + h2s->h2c->flags |= H2_CF_WAIT_INLIST; + } + return 0; + } + h2s->flags &= ~H2_SF_NOTIFIED; + + if (h2s->h2c->st0 < H2_CS_FRAME_H) { + TRACE_DEVEL("connection not ready, leaving", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2s->h2c->conn, h2s); + return 0; + } + + if (h2s->h2c->st0 >= H2_CS_ERROR) { + se_fl_set(h2s->sd, SE_FL_ERROR); + TRACE_DEVEL("connection is in error, leaving in error", H2_EV_H2S_SEND|H2_EV_H2S_BLK|H2_EV_H2S_ERR|H2_EV_STRM_ERR, h2s->h2c->conn, h2s); + return 0; + } + + htx = htx_from_buf(buf); + + if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count) + h2s->flags |= H2_SF_OUTGOING_DATA; + + if (htx->extra && htx->extra != HTX_UNKOWN_PAYLOAD_LENGTH) + h2s->flags |= H2_SF_MORE_HTX_DATA; + else + h2s->flags &= ~H2_SF_MORE_HTX_DATA; + + if (h2s->id == 0) { + int32_t id = h2c_get_next_sid(h2s->h2c); + + if (id < 0) { + se_fl_set(h2s->sd, SE_FL_ERROR); + TRACE_DEVEL("couldn't get a stream ID, leaving in error", H2_EV_H2S_SEND|H2_EV_H2S_BLK|H2_EV_H2S_ERR|H2_EV_STRM_ERR, h2s->h2c->conn, h2s); + return 0; + } + + eb32_delete(&h2s->by_id); + h2s->by_id.key = h2s->id = id; + h2s->h2c->max_id = id; + h2s->h2c->nb_reserved--; + eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id); + } + + while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) && + count && !htx_is_empty(htx)) { + idx = htx_get_head(htx); + blk = htx_get_blk(htx, idx); + btype = htx_get_blk_type(blk); + bsize = htx_get_blksz(blk); + + switch (btype) { + case HTX_BLK_REQ_SL: + /* start-line before headers */ + ret = h2s_snd_bhdrs(h2s, htx); + if (ret > 0) { + total += ret; + count -= ret; + if (ret < bsize) + goto done; + } + break; + + case HTX_BLK_RES_SL: + /* start-line before headers */ + ret = h2s_snd_fhdrs(h2s, htx); + if (ret > 0) { + total += ret; + count -= ret; + if (ret < bsize) + goto done; + } + break; + + case HTX_BLK_DATA: + /* all these cause the emission of a DATA frame (possibly empty) */ + if (!(h2s->h2c->flags & H2_CF_IS_BACK) && + (h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_BODYLESS_RESP)) == H2_SF_BODYLESS_RESP) + ret = h2s_skip_data(h2s, buf, count); + else + ret = h2s_make_data(h2s, buf, count); + if (ret > 0) { + htx = htx_from_buf(buf); + total += ret; + count -= ret; + if (ret < bsize) + goto done; + } + break; + + case HTX_BLK_TLR: + case HTX_BLK_EOT: + /* This is the first trailers block, all the subsequent ones */ + ret = h2s_make_trailers(h2s, htx); + if (ret > 0) { + total += ret; + count -= ret; + if (ret < bsize) + goto done; + } + break; + + default: + htx_remove_blk(htx, blk); + total += bsize; + count -= bsize; + break; + } + } + + done: + if (h2s->st >= H2_SS_HLOC) { + /* trim any possibly pending data after we close (extra CR-LF, + * unprocessed trailers, abnormal extra data, ...) + */ + total += count; + count = 0; + } + + /* RST are sent similarly to frame acks */ + if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) { + TRACE_DEVEL("reporting RST/error to the app-layer stream", H2_EV_H2S_SEND|H2_EV_H2S_ERR|H2_EV_STRM_ERR, h2s->h2c->conn, h2s); + se_fl_set_error(h2s->sd); + if (h2s_send_rst_stream(h2s->h2c, h2s) > 0) + h2s_close(h2s); + } + + htx_to_buf(htx, buf); + + if (total > 0) { + if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND)) { + TRACE_DEVEL("data queued, waking up h2c sender", H2_EV_H2S_SEND|H2_EV_H2C_SEND, h2s->h2c->conn, h2s); + if (h2_send(h2s->h2c)) + tasklet_wakeup(h2s->h2c->wait_event.tasklet); + } + + } + /* If we're waiting for flow control, and we got a shutr on the + * connection, we will never be unlocked, so add an error on + * the stream connector. + */ + if ((h2s->h2c->flags & H2_CF_RCVD_SHUT) && + !b_data(&h2s->h2c->dbuf) && + (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) { + TRACE_DEVEL("fctl with shutr, reporting error to app-layer", H2_EV_H2S_SEND|H2_EV_STRM_SEND|H2_EV_STRM_ERR, h2s->h2c->conn, h2s); + se_fl_set_error(h2s->sd); + } + + if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL) && + !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) { + /* Ok we managed to send something, leave the send_list if we were still there */ + h2_remove_from_list(h2s); + TRACE_DEVEL("Removed from h2s list", H2_EV_H2S_SEND|H2_EV_H2C_SEND, h2s->h2c->conn, h2s); + } + + TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s); + return total; +} + +static size_t h2_nego_ff(struct stconn *sc, struct buffer *input, size_t count, unsigned int may_splice) +{ + struct h2s *h2s = __sc_mux_strm(sc); + struct h2c *h2c = h2s->h2c; + struct buffer *mbuf; + size_t sz , ret = 0; + + TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s); + + /* If we were not just woken because we wanted to send but couldn't, + * and there's somebody else that is waiting to send, do nothing, + * we will subscribe later and be put at the end of the list + * + * WARNING: h2_done_ff() is responsible to remove H2_SF_NOTIFIED flags + * depending on iobuf flags. + */ + if (!(h2s->flags & H2_SF_NOTIFIED) && + (!LIST_ISEMPTY(&h2c->send_list) || !LIST_ISEMPTY(&h2c->fctl_list))) { + if (LIST_INLIST(&h2s->list)) + TRACE_DEVEL("stream already waiting, leaving", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2s->h2c->conn, h2s); + else { + TRACE_DEVEL("other streams already waiting, going to the queue and leaving", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2s->h2c->conn, h2s); + h2s->h2c->flags |= H2_CF_WAIT_INLIST; + } + h2s->sd->iobuf.flags |= IOBUF_FL_FF_BLOCKED; + goto end; + } + + if (h2s_mws(h2s) <= 0) { + h2s->flags |= H2_SF_BLK_SFCTL; + if (LIST_INLIST(&h2s->list)) + LIST_DEL_INIT(&h2s->list); + LIST_APPEND(&h2c->blocked_list, &h2s->list); + h2s->sd->iobuf.flags |= IOBUF_FL_FF_BLOCKED; + TRACE_STATE("stream window <=0, flow-controlled", H2_EV_H2S_SEND|H2_EV_H2S_FCTL, h2c->conn, h2s); + goto end; + } + if (h2c->mws <= 0) { + h2s->flags |= H2_SF_BLK_MFCTL; + h2s->sd->iobuf.flags |= IOBUF_FL_FF_BLOCKED; + TRACE_STATE("connection window <=0, stream flow-controlled", H2_EV_H2S_SEND|H2_EV_H2C_FCTL, h2c->conn, h2s); + goto end; + } + + sz = count; + if (sz > h2s_mws(h2s)) + sz = h2s_mws(h2s); + if (h2c->mfs && sz > h2c->mfs) + sz = h2c->mfs; // >0 + if (sz > h2c->mws) + sz = h2c->mws; + + if (count > sz) + count = sz; + + mbuf = br_tail(h2c->mbuf); + retry: + if (br_count(h2c->mbuf) > h2c->nb_streams) { + /* more buffers than streams allocated, pointless + * to continue, we'd use more RAM for no reason. + */ + h2s->flags |= H2_SF_BLK_MROOM; + h2s->sd->iobuf.flags |= IOBUF_FL_FF_BLOCKED; + TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + } + + if (!h2_get_buf(h2c, mbuf)) { + h2c->flags |= H2_CF_MUX_MALLOC; + h2s->flags |= H2_SF_BLK_MROOM; + h2s->sd->iobuf.flags |= IOBUF_FL_FF_BLOCKED; + TRACE_STATE("waiting for room in output buffer", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + } + + if (b_room(mbuf) < sz && b_room(mbuf) < b_size(mbuf) / 4) { + if ((mbuf = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + h2s->sd->iobuf.flags |= IOBUF_FL_FF_BLOCKED; + TRACE_STATE("too large data present in output buffer, waiting for emptiness", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + } + + while (1) { + if (b_contig_space(mbuf) >= 9 || !b_space_wraps(mbuf)) + break; + b_slow_realign(mbuf, trash.area, b_data(mbuf)); + } + + if (b_contig_space(mbuf) <= 9) { + if ((mbuf = br_tail_add(h2c->mbuf)) != NULL) + goto retry; + h2c->flags |= H2_CF_MUX_MFULL; + h2s->flags |= H2_SF_BLK_MROOM; + h2s->sd->iobuf.flags |= IOBUF_FL_FF_BLOCKED; + TRACE_STATE("output buffer full", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2c->conn, h2s); + goto end; + } + + /* Cannot forward more than available room in output buffer */ + sz = b_contig_space(mbuf) - 9; + if (count > sz) + count = sz; + + /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */ + memcpy(b_tail(mbuf), "\x00\x00\x00\x00\x00", 5); + write_n32(b_tail(mbuf) + 5, h2s->id); // 4 bytes + + h2s->sd->iobuf.buf = mbuf; + h2s->sd->iobuf.offset = 9; + h2s->sd->iobuf.data = 0; + + /* forward remaining input data */ + if (b_data(input)) { + size_t xfer = count; + + if (xfer > b_data(input)) + xfer = b_data(input); + b_add(mbuf, 9); + h2s->sd->iobuf.data = b_xfer(mbuf, input, xfer); + b_sub(mbuf, 9); + + /* Cannot forward more data, wait for room */ + if (b_data(input)) + goto end; + } + + ret = count - h2s->sd->iobuf.data; + end: + if (h2s->sd->iobuf.flags & IOBUF_FL_FF_BLOCKED) + h2s->flags &= ~H2_SF_NOTIFIED; + TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s); + return ret; +} + +static size_t h2_done_ff(struct stconn *sc) +{ + struct h2s *h2s = __sc_mux_strm(sc); + struct h2c *h2c = h2s->h2c; + struct sedesc *sd = h2s->sd; + struct buffer *mbuf; + char *head; + size_t total = 0; + + TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s); + + mbuf = sd->iobuf.buf; + if (!mbuf) + goto end; + head = b_peek(mbuf, b_data(mbuf) - sd->iobuf.data); + + if (sd->iobuf.flags & IOBUF_FL_EOI) + h2s->flags &= ~H2_SF_MORE_HTX_DATA; + + if (!(sd->iobuf.flags & IOBUF_FL_FF_BLOCKED) && + !(h2s->flags & H2_SF_BLK_SFCTL) && + !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) { + /* Ok we managed to send something, leave the send_list if we were still there */ + h2_remove_from_list(h2s); + } + + if (!sd->iobuf.data) + goto end; + + /* Perform a synchronous send but in all cases, consider + * everything was already sent from the SC point of view. + */ + total = sd->iobuf.data; + h2_set_frame_size(head, total); + b_add(mbuf, 9); + h2s->sws -= total; + h2c->mws -= total; + if (h2_send(h2s->h2c)) + tasklet_wakeup(h2s->h2c->wait_event.tasklet); + + end: + sd->iobuf.buf = NULL; + sd->iobuf.offset = 0; + sd->iobuf.data = 0; + + if (!(sd->iobuf.flags & IOBUF_FL_INTERIM_FF)) + h2s->flags &= ~H2_SF_NOTIFIED; + + TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s); + return total; +} + +static int h2_resume_ff(struct stconn *sc, unsigned int flags) +{ + return 0; +} + +/* appends some info about stream <h2s> to buffer <msg>, or does nothing if + * <h2s> is NULL. Returns non-zero if the stream is considered suspicious. May + * emit multiple lines, each new one being prefixed with <pfx>, if <pfx> is not + * NULL, otherwise a single line is used. + */ +static int h2_dump_h2s_info(struct buffer *msg, const struct h2s *h2s, const char *pfx) +{ + int ret = 0; + + if (!h2s) + return ret; + + chunk_appendf(msg, " h2s.id=%d .st=%s .flg=0x%04x .rxbuf=%u@%p+%u/%u", + h2s->id, h2s_st_to_str(h2s->st), h2s->flags, + (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf), + (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf)); + + if (pfx) + chunk_appendf(msg, "\n%s", pfx); + + chunk_appendf(msg, " .sc=%p", h2s_sc(h2s)); + if (h2s_sc(h2s)) + chunk_appendf(msg, "(.flg=0x%08x .app=%p)", + h2s_sc(h2s)->flags, h2s_sc(h2s)->app); + + chunk_appendf(msg, " .sd=%p", h2s->sd); + chunk_appendf(msg, "(.flg=0x%08x)", se_fl_get(h2s->sd)); + + if (pfx) + chunk_appendf(msg, "\n%s", pfx); + + chunk_appendf(msg, " .subs=%p", h2s->subs); + if (h2s->subs) { + chunk_appendf(msg, "(ev=%d tl=%p", h2s->subs->events, h2s->subs->tasklet); + chunk_appendf(msg, " tl.calls=%d tl.ctx=%p tl.fct=", + h2s->subs->tasklet->calls, + h2s->subs->tasklet->context); + if (h2s->subs->tasklet->calls >= 1000000) + ret = 1; + resolve_sym_name(msg, NULL, h2s->subs->tasklet->process); + chunk_appendf(msg, ")"); + } + return ret; +} + +/* appends some info about connection <h2c> to buffer <msg>, or does nothing if + * <h2c> is NULL. Returns non-zero if the connection is considered suspicious. + * May emit multiple lines, each new one being prefixed with <pfx>, if <pfx> is + * not NULL, otherwise a single line is used. + */ +static int h2_dump_h2c_info(struct buffer *msg, struct h2c *h2c, const char *pfx) +{ + const struct buffer *hmbuf, *tmbuf; + const struct h2s *h2s = NULL; + struct eb32_node *node; + int fctl_cnt = 0; + int send_cnt = 0; + int tree_cnt = 0; + int orph_cnt = 0; + int ret = 0; + + if (!h2c) + return ret; + + list_for_each_entry(h2s, &h2c->fctl_list, list) + fctl_cnt++; + + list_for_each_entry(h2s, &h2c->send_list, list) + send_cnt++; + + node = eb32_first(&h2c->streams_by_id); + while (node) { + h2s = container_of(node, struct h2s, by_id); + tree_cnt++; + if (!h2s_sc(h2s)) + orph_cnt++; + node = eb32_next(node); + } + + hmbuf = br_head(h2c->mbuf); + tmbuf = br_tail(h2c->mbuf); + chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x" + " .nbst=%u .nbsc=%u", + h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags, + h2c->nb_streams, h2c->nb_sc); + + if (pfx) + chunk_appendf(msg, "\n%s", pfx); + + chunk_appendf(msg, " .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d" + " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u", + fctl_cnt, send_cnt, tree_cnt, orph_cnt, + h2c->wait_event.events, h2c->dsi, + (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf), + (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf)); + + if (pfx) + chunk_appendf(msg, "\n%s", pfx); + + chunk_appendf(msg, " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]", + br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf), + (unsigned int)b_data(hmbuf), b_orig(hmbuf), + (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf), + (unsigned int)b_data(tmbuf), b_orig(tmbuf), + (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf)); + + chunk_appendf(msg, " .task=%p", h2c->task); + if (h2c->task) { + chunk_appendf(msg, " .exp=%s", + h2c->task->expire ? tick_is_expired(h2c->task->expire, now_ms) ? "<PAST>" : + human_time(TICKS_TO_MS(h2c->task->expire - now_ms), TICKS_TO_MS(1000)) : "<NEVER>"); + } + + return ret; +} + +/* for debugging with CLI's "show fd" command */ +static int h2_show_fd(struct buffer *msg, struct connection *conn) +{ + struct h2c *h2c = conn->ctx; + const struct h2s *h2s; + struct eb32_node *node; + int ret = 0; + + if (!h2c) + return ret; + + ret |= h2_dump_h2c_info(msg, h2c, NULL); + + node = eb32_last(&h2c->streams_by_id); + if (node) { + h2s = container_of(node, struct h2s, by_id); + chunk_appendf(msg, " last_h2s=%p", h2s); + ret |= h2_dump_h2s_info(msg, h2s, NULL); + } + + return ret; +} + +/* for debugging with CLI's "show sess" command. May emit multiple lines, each + * new one being prefixed with <pfx>, if <pfx> is not NULL, otherwise a single + * line is used. Each field starts with a space so it's safe to print it after + * existing fields. + */ +static int h2_show_sd(struct buffer *msg, struct sedesc *sd, const char *pfx) +{ + struct h2s *h2s = sd->se; + int ret = 0; + + if (!h2s) + return ret; + + chunk_appendf(msg, " h2s=%p", h2s); + ret |= h2_dump_h2s_info(msg, h2s, pfx); + if (pfx) + chunk_appendf(msg, "\n%s", pfx); + chunk_appendf(msg, " h2c=%p", h2s->h2c); + ret |= h2_dump_h2c_info(msg, h2s->h2c, pfx); + return ret; +} + +/* Migrate the the connection to the current thread. + * Return 0 if successful, non-zero otherwise. + * Expected to be called with the old thread lock held. + */ +static int h2_takeover(struct connection *conn, int orig_tid) +{ + struct h2c *h2c = conn->ctx; + struct task *task; + struct task *new_task; + struct tasklet *new_tasklet; + + /* Pre-allocate tasks so that we don't have to roll back after the xprt + * has been migrated. + */ + new_task = task_new_here(); + new_tasklet = tasklet_new(); + if (!new_task || !new_tasklet) + goto fail; + + if (fd_takeover(conn->handle.fd, conn) != 0) + goto fail; + + if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) { + /* We failed to takeover the xprt, even if the connection may + * still be valid, flag it as error'd, as we have already + * taken over the fd, and wake the tasklet, so that it will + * destroy it. + */ + conn->flags |= CO_FL_ERROR; + tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid); + goto fail; + } + + if (h2c->wait_event.events) + h2c->conn->xprt->unsubscribe(h2c->conn, h2c->conn->xprt_ctx, + h2c->wait_event.events, &h2c->wait_event); + + task = h2c->task; + if (task) { + /* only assign a task if there was already one, otherwise + * the preallocated new task will be released. + */ + task->context = NULL; + h2c->task = NULL; + __ha_barrier_store(); + task_kill(task); + + h2c->task = new_task; + new_task = NULL; + h2c->task->process = h2_timeout_task; + h2c->task->context = h2c; + } + + /* To let the tasklet know it should free itself, and do nothing else, + * set its context to NULL. + */ + h2c->wait_event.tasklet->context = NULL; + tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid); + + h2c->wait_event.tasklet = new_tasklet; + h2c->wait_event.tasklet->process = h2_io_cb; + h2c->wait_event.tasklet->context = h2c; + h2c->conn->xprt->subscribe(h2c->conn, h2c->conn->xprt_ctx, + SUB_RETRY_RECV, &h2c->wait_event); + + if (new_task) + __task_free(new_task); + return 0; + fail: + if (new_task) + __task_free(new_task); + tasklet_free(new_tasklet); + return -1; +} + +/*******************************************************/ +/* functions below are dedicated to the config parsers */ +/*******************************************************/ + +/* config parser for global "tune.h2.header-table-size" */ +static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx, + const struct proxy *defpx, const char *file, int line, + char **err) +{ + if (too_many_args(1, args, err, NULL)) + return -1; + + h2_settings_header_table_size = atoi(args[1]); + if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) { + memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]); + return -1; + } + return 0; +} + +/* config parser for global "tune.h2.{be.,fe.,}initial-window-size" */ +static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx, + const struct proxy *defpx, const char *file, int line, + char **err) +{ + int *vptr; + + if (too_many_args(1, args, err, NULL)) + return -1; + + /* backend/frontend/default */ + vptr = (args[0][8] == 'b') ? &h2_be_settings_initial_window_size : + (args[0][8] == 'f') ? &h2_fe_settings_initial_window_size : + &h2_settings_initial_window_size; + + *vptr = atoi(args[1]); + if (*vptr < 0) { + memprintf(err, "'%s' expects a positive numeric value.", args[0]); + return -1; + } + return 0; +} + +/* config parser for global "tune.h2.{be.,fe.,}max-concurrent-streams" */ +static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx, + const struct proxy *defpx, const char *file, int line, + char **err) +{ + uint *vptr; + + if (too_many_args(1, args, err, NULL)) + return -1; + + /* backend/frontend/default */ + vptr = (args[0][8] == 'b') ? &h2_be_settings_max_concurrent_streams : + (args[0][8] == 'f') ? &h2_fe_settings_max_concurrent_streams : + &h2_settings_max_concurrent_streams; + + *vptr = atoi(args[1]); + if ((int)*vptr < 0) { + memprintf(err, "'%s' expects a positive numeric value.", args[0]); + return -1; + } + return 0; +} + +/* config parser for global "tune.h2.fe.max-total-streams" */ +static int h2_parse_max_total_streams(char **args, int section_type, struct proxy *curpx, + const struct proxy *defpx, const char *file, int line, + char **err) +{ + uint *vptr; + + if (too_many_args(1, args, err, NULL)) + return -1; + + /* frontend only for now */ + vptr = &h2_fe_max_total_streams; + + *vptr = atoi(args[1]); + if ((int)*vptr < 0) { + memprintf(err, "'%s' expects a positive numeric value.", args[0]); + return -1; + } + return 0; +} + +/* config parser for global "tune.h2.max-frame-size" */ +static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx, + const struct proxy *defpx, const char *file, int line, + char **err) +{ + if (too_many_args(1, args, err, NULL)) + return -1; + + h2_settings_max_frame_size = atoi(args[1]); + if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) { + memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]); + return -1; + } + return 0; +} + + +/* config parser for global "tune.h2.zero-copy-fwd-send" */ +static int h2_parse_zero_copy_fwd_snd(char **args, int section_type, struct proxy *curpx, + const struct proxy *defpx, const char *file, int line, + char **err) +{ + if (too_many_args(1, args, err, NULL)) + return -1; + + if (strcmp(args[1], "on") == 0) + global.tune.no_zero_copy_fwd &= ~NO_ZERO_COPY_FWD_H2_SND; + else if (strcmp(args[1], "off") == 0) + global.tune.no_zero_copy_fwd |= NO_ZERO_COPY_FWD_H2_SND; + else { + memprintf(err, "'%s' expects 'on' or 'off'.", args[0]); + return -1; + } + return 0; +} + +/****************************************/ +/* MUX initialization and instantiation */ +/***************************************/ + +/* The mux operations */ +static const struct mux_ops h2_ops = { + .init = h2_init, + .wake = h2_wake, + .snd_buf = h2_snd_buf, + .rcv_buf = h2_rcv_buf, + .nego_fastfwd = h2_nego_ff, + .done_fastfwd = h2_done_ff, + .resume_fastfwd = h2_resume_ff, + .subscribe = h2_subscribe, + .unsubscribe = h2_unsubscribe, + .attach = h2_attach, + .get_first_sc = h2_get_first_sc, + .detach = h2_detach, + .destroy = h2_destroy, + .avail_streams = h2_avail_streams, + .used_streams = h2_used_streams, + .shutr = h2_shutr, + .shutw = h2_shutw, + .ctl = h2_ctl, + .sctl = h2_sctl, + .show_fd = h2_show_fd, + .show_sd = h2_show_sd, + .takeover = h2_takeover, + .flags = MX_FL_HTX|MX_FL_HOL_RISK|MX_FL_NO_UPG|MX_FL_REVERSABLE, + .name = "H2", +}; + +static struct mux_proto_list mux_proto_h2 = + { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops }; + +INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2); + +/* config keyword parsers */ +static struct cfg_kw_list cfg_kws = {ILH, { + { CFG_GLOBAL, "tune.h2.be.initial-window-size", h2_parse_initial_window_size }, + { CFG_GLOBAL, "tune.h2.be.max-concurrent-streams", h2_parse_max_concurrent_streams }, + { CFG_GLOBAL, "tune.h2.fe.initial-window-size", h2_parse_initial_window_size }, + { CFG_GLOBAL, "tune.h2.fe.max-concurrent-streams", h2_parse_max_concurrent_streams }, + { CFG_GLOBAL, "tune.h2.fe.max-total-streams", h2_parse_max_total_streams }, + { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size }, + { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size }, + { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams }, + { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size }, + { CFG_GLOBAL, "tune.h2.zero-copy-fwd-send", h2_parse_zero_copy_fwd_snd }, + { 0, NULL, NULL } +}}; + +INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws); + +/* initialize internal structs after the config is parsed. + * Returns zero on success, non-zero on error. + */ +static int init_h2() +{ + pool_head_hpack_tbl = create_pool("hpack_tbl", + h2_settings_header_table_size, + MEM_F_SHARED|MEM_F_EXACT); + if (!pool_head_hpack_tbl) { + ha_alert("failed to allocate hpack_tbl memory pool\n"); + return (ERR_ALERT | ERR_FATAL); + } + return ERR_NONE; +} + +REGISTER_POST_CHECK(init_h2); |