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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 12:18:05 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 12:18:05 +0000
commitb46aad6df449445a9fc4aa7b32bd40005438e3f7 (patch)
tree751aa858ca01f35de800164516b298887382919d /src/mux_h2.c
parentInitial commit. (diff)
downloadhaproxy-b46aad6df449445a9fc4aa7b32bd40005438e3f7.tar.xz
haproxy-b46aad6df449445a9fc4aa7b32bd40005438e3f7.zip
Adding upstream version 2.9.5.upstream/2.9.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/mux_h2.c')
-rw-r--r--src/mux_h2.c7598
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);