diff options
Diffstat (limited to 'src/h3.c')
| -rw-r--r-- | src/h3.c | 1545 |
1 files changed, 1545 insertions, 0 deletions
diff --git a/src/h3.c b/src/h3.c new file mode 100644 index 0000000..efa4068 --- /dev/null +++ b/src/h3.c @@ -0,0 +1,1545 @@ +/* + * HTTP/3 protocol processing + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation, version 2.1 + * exclusively. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <import/ist.h> + +#include <haproxy/api.h> +#include <haproxy/buf.h> +#include <haproxy/chunk.h> +#include <haproxy/connection.h> +#include <haproxy/dynbuf.h> +#include <haproxy/h3.h> +#include <haproxy/h3_stats.h> +#include <haproxy/http.h> +#include <haproxy/http-hdr-t.h> +#include <haproxy/http_htx.h> +#include <haproxy/htx.h> +#include <haproxy/intops.h> +#include <haproxy/istbuf.h> +#include <haproxy/mux_quic.h> +#include <haproxy/pool.h> +#include <haproxy/qmux_http.h> +#include <haproxy/qpack-dec.h> +#include <haproxy/qpack-enc.h> +#include <haproxy/quic_conn-t.h> +#include <haproxy/quic_enc.h> +#include <haproxy/stats-t.h> +#include <haproxy/tools.h> +#include <haproxy/trace.h> + +/* trace source and events */ +static void h3_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); + +static const struct trace_event h3_trace_events[] = { +#define H3_EV_RX_FRAME (1ULL << 0) + { .mask = H3_EV_RX_FRAME, .name = "rx_frame", .desc = "receipt of any H3 frame" }, +#define H3_EV_RX_DATA (1ULL << 1) + { .mask = H3_EV_RX_DATA, .name = "rx_data", .desc = "receipt of H3 DATA frame" }, +#define H3_EV_RX_HDR (1ULL << 2) + { .mask = H3_EV_RX_HDR, .name = "rx_hdr", .desc = "receipt of H3 HEADERS frame" }, +#define H3_EV_RX_SETTINGS (1ULL << 3) + { .mask = H3_EV_RX_SETTINGS, .name = "rx_settings", .desc = "receipt of H3 SETTINGS frame" }, +#define H3_EV_TX_DATA (1ULL << 4) + { .mask = H3_EV_TX_DATA, .name = "tx_data", .desc = "transmission of H3 DATA frame" }, +#define H3_EV_TX_HDR (1ULL << 5) + { .mask = H3_EV_TX_HDR, .name = "tx_hdr", .desc = "transmission of H3 HEADERS frame" }, +#define H3_EV_TX_SETTINGS (1ULL << 6) + { .mask = H3_EV_TX_SETTINGS, .name = "tx_settings", .desc = "transmission of H3 SETTINGS frame" }, +#define H3_EV_H3S_NEW (1ULL << 7) + { .mask = H3_EV_H3S_NEW, .name = "h3s_new", .desc = "new H3 stream" }, +#define H3_EV_H3S_END (1ULL << 8) + { .mask = H3_EV_H3S_END, .name = "h3s_end", .desc = "H3 stream terminated" }, + { } +}; + +static const struct name_desc h3_trace_lockon_args[4] = { + /* arg1 */ { /* already used by the connection */ }, + /* arg2 */ { .name="qcs", .desc="QUIC stream" }, + /* arg3 */ { }, + /* arg4 */ { } +}; + +static const struct name_desc h3_trace_decoding[] = { +#define H3_VERB_CLEAN 1 + { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" }, +#define H3_VERB_MINIMAL 2 + { .name="minimal", .desc="report only qcc/qcs state and flags, no real decoding" }, + { /* end */ } +}; + +struct trace_source trace_h3 = { + .name = IST("h3"), + .desc = "HTTP/3 transcoder", + .arg_def = TRC_ARG1_CONN, /* TRACE()'s first argument is always a connection */ + .default_cb = h3_trace, + .known_events = h3_trace_events, + .lockon_args = h3_trace_lockon_args, + .decoding = h3_trace_decoding, + .report_events = ~0, /* report everything by default */ +}; + +#define TRACE_SOURCE &trace_h3 +INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE); + +#if defined(DEBUG_H3) +#define h3_debug_printf fprintf +#define h3_debug_hexdump debug_hexdump +#else +#define h3_debug_printf(...) do { } while (0) +#define h3_debug_hexdump(...) do { } while (0) +#endif + +#define H3_CF_SETTINGS_SENT 0x00000001 /* SETTINGS frame already sent on local control stream */ +#define H3_CF_SETTINGS_RECV 0x00000002 /* SETTINGS frame already received on remote control stream */ +#define H3_CF_UNI_CTRL_SET 0x00000004 /* Remote H3 Control stream opened */ +#define H3_CF_UNI_QPACK_DEC_SET 0x00000008 /* Remote QPACK decoder stream opened */ +#define H3_CF_UNI_QPACK_ENC_SET 0x00000010 /* Remote QPACK encoder stream opened */ + +/* Default settings */ +static uint64_t h3_settings_qpack_max_table_capacity = 0; +static uint64_t h3_settings_qpack_blocked_streams = 4096; +static uint64_t h3_settings_max_field_section_size = QUIC_VARINT_8_BYTE_MAX; /* Unlimited */ + +struct h3c { + struct qcc *qcc; + struct qcs *ctrl_strm; /* Control stream */ + enum h3_err err; + uint32_t flags; + + /* Settings */ + uint64_t qpack_max_table_capacity; + uint64_t qpack_blocked_streams; + uint64_t max_field_section_size; + + uint64_t id_goaway; /* stream ID used for a GOAWAY frame */ + + struct buffer_wait buf_wait; /* wait list for buffer allocations */ + /* Stats counters */ + struct h3_counters *prx_counters; +}; + +DECLARE_STATIC_POOL(pool_head_h3c, "h3c", sizeof(struct h3c)); + +#define H3_SF_UNI_INIT 0x00000001 /* stream type not parsed for unidirectional stream */ +#define H3_SF_UNI_NO_H3 0x00000002 /* unidirectional stream does not carry H3 frames */ +#define H3_SF_HAVE_CLEN 0x00000004 /* content-length header is present */ + +struct h3s { + struct h3c *h3c; + + enum h3s_t type; + enum h3s_st_req st_req; /* only used for request streams */ + uint64_t demux_frame_len; + uint64_t demux_frame_type; + + unsigned long long body_len; /* known request body length from content-length header if present */ + unsigned long long data_len; /* total length of all parsed DATA */ + + int flags; +}; + +DECLARE_STATIC_POOL(pool_head_h3s, "h3s", sizeof(struct h3s)); + +/* Initialize an uni-stream <qcs> by reading its type from <b>. + * + * Returns the count of consumed bytes or a negative error code. + */ +static ssize_t h3_init_uni_stream(struct h3c *h3c, struct qcs *qcs, + struct buffer *b) +{ + /* decode unidirectional stream type */ + struct h3s *h3s = qcs->ctx; + uint64_t type; + size_t len = 0, ret; + + TRACE_ENTER(H3_EV_H3S_NEW, qcs->qcc->conn, qcs); + + BUG_ON_HOT(!quic_stream_is_uni(qcs->id) || + h3s->flags & H3_SF_UNI_INIT); + + ret = b_quic_dec_int(&type, b, &len); + if (!ret) { + /* not enough data to decode uni stream type, retry later */ + TRACE_DATA("cannot decode uni stream type due to incomplete data", H3_EV_H3S_NEW, qcs->qcc->conn, qcs); + goto out; + } + + switch (type) { + case H3_UNI_S_T_CTRL: + if (h3c->flags & H3_CF_UNI_CTRL_SET) { + qcc_emit_cc_app(qcs->qcc, H3_STREAM_CREATION_ERROR, 1); + return -1; + } + h3c->flags |= H3_CF_UNI_CTRL_SET; + h3s->type = H3S_T_CTRL; + break; + + case H3_UNI_S_T_PUSH: + /* TODO not supported for the moment */ + h3s->type = H3S_T_PUSH; + break; + + case H3_UNI_S_T_QPACK_DEC: + if (h3c->flags & H3_CF_UNI_QPACK_DEC_SET) { + qcc_emit_cc_app(qcs->qcc, H3_STREAM_CREATION_ERROR, 1); + return -1; + } + h3c->flags |= H3_CF_UNI_QPACK_DEC_SET; + h3s->type = H3S_T_QPACK_DEC; + h3s->flags |= H3_SF_UNI_NO_H3; + break; + + case H3_UNI_S_T_QPACK_ENC: + if (h3c->flags & H3_CF_UNI_QPACK_ENC_SET) { + qcc_emit_cc_app(qcs->qcc, H3_STREAM_CREATION_ERROR, 1); + return -1; + } + h3c->flags |= H3_CF_UNI_QPACK_ENC_SET; + h3s->type = H3S_T_QPACK_ENC; + h3s->flags |= H3_SF_UNI_NO_H3; + break; + + default: + /* draft-ietf-quic-http34 9. Extensions to HTTP/3 + * + * Implementations MUST [...] abort reading on unidirectional + * streams that have unknown or unsupported types. + */ + qcs->flags |= QC_SF_READ_ABORTED; + return -1; + }; + + h3s->flags |= H3_SF_UNI_INIT; + + out: + TRACE_LEAVE(H3_EV_H3S_NEW, qcs->qcc->conn, qcs); + return len; +} + +/* Parse a buffer <b> for a <qcs> uni-stream which does not contains H3 frames. + * This may be used for QPACK encoder/decoder streams for example. <fin> is set + * if this is the last frame of the stream. + * + * Returns the number of consumed bytes or a negative error code. + */ +static ssize_t h3_parse_uni_stream_no_h3(struct qcs *qcs, struct buffer *b, int fin) +{ + struct h3s *h3s = qcs->ctx; + + BUG_ON_HOT(!quic_stream_is_uni(qcs->id) || + !(h3s->flags & H3_SF_UNI_NO_H3)); + + switch (h3s->type) { + case H3S_T_QPACK_DEC: + if (qpack_decode_dec(b, fin, qcs)) + return -1; + break; + case H3S_T_QPACK_ENC: + if (qpack_decode_enc(b, fin, qcs)) + return -1; + break; + case H3S_T_UNKNOWN: + default: + /* Unknown stream should be flagged with QC_SF_READ_ABORTED. */ + ABORT_NOW(); + } + + /* TODO adjust return code */ + return 0; +} + +/* Decode a H3 frame header from <rxbuf> buffer. The frame type is stored in + * <ftype> and length in <flen>. + * + * Returns the size of the H3 frame header. Note that the input buffer is not + * consumed. + */ +static inline size_t h3_decode_frm_header(uint64_t *ftype, uint64_t *flen, + struct buffer *b) +{ + size_t hlen; + + hlen = 0; + if (!b_quic_dec_int(ftype, b, &hlen) || + !b_quic_dec_int(flen, b, &hlen)) { + return 0; + } + + return hlen; +} + +/* Check if H3 frame of type <ftype> is valid when received on stream <qcs>. + * + * Returns a boolean. If false, a connection error H3_FRAME_UNEXPECTED should + * be reported. + */ +static int h3_is_frame_valid(struct h3c *h3c, struct qcs *qcs, uint64_t ftype) +{ + struct h3s *h3s = qcs->ctx; + const uint64_t id = qcs->id; + + BUG_ON_HOT(h3s->type == H3S_T_UNKNOWN); + + switch (ftype) { + case H3_FT_DATA: + return h3s->type != H3S_T_CTRL && (h3s->st_req == H3S_ST_REQ_HEADERS || + h3s->st_req == H3S_ST_REQ_DATA); + + case H3_FT_HEADERS: + return h3s->type != H3S_T_CTRL && h3s->st_req != H3S_ST_REQ_TRAILERS; + + case H3_FT_CANCEL_PUSH: + case H3_FT_GOAWAY: + case H3_FT_MAX_PUSH_ID: + /* Only allowed for control stream. First frame of control + * stream MUST be SETTINGS. + */ + return h3s->type == H3S_T_CTRL && + (h3c->flags & H3_CF_SETTINGS_RECV); + + case H3_FT_SETTINGS: + /* draft-ietf-quic-http34 7.2.4. SETTINGS + * + * If an endpoint receives a second SETTINGS frame on the control + * stream, the endpoint MUST respond with a connection error of type + * H3_FRAME_UNEXPECTED. + */ + return h3s->type == H3S_T_CTRL && + !(h3c->flags & H3_CF_SETTINGS_RECV); + + case H3_FT_PUSH_PROMISE: + return h3s->type != H3S_T_CTRL && + (id & QCS_ID_SRV_INTIATOR_BIT); + + default: + /* draft-ietf-quic-http34 9. Extensions to HTTP/3 + * + * Implementations MUST discard frames [...] that have unknown + * or unsupported types. + */ + return h3s->type != H3S_T_CTRL || (h3c->flags & H3_CF_SETTINGS_RECV); + } +} + +/* Check from stream <qcs> that length of all DATA frames does not exceed with + * a previously parsed content-length header. <fin> must be set for the last + * data of the stream so that length of DATA frames must be equal to the + * content-length. + * + * This must only be called for a stream with H3_SF_HAVE_CLEN flag. + * + * Return 0 on valid else non-zero. + */ +static int h3_check_body_size(struct qcs *qcs, int fin) +{ + struct h3s *h3s = qcs->ctx; + int ret = 0; + TRACE_ENTER(H3_EV_RX_FRAME, qcs->qcc->conn, qcs); + + /* Reserved for streams with a previously parsed content-length header. */ + BUG_ON(!(h3s->flags & H3_SF_HAVE_CLEN)); + + /* RFC 9114 4.1.2. Malformed Requests and Responses + * + * A request or response that is defined as having content when it + * contains a Content-Length header field (Section 8.6 of [HTTP]) is + * malformed if the value of the Content-Length header field does not + * equal the sum of the DATA frame lengths received. + * + * TODO for backend support + * A response that is + * defined as never having content, even when a Content-Length is + * present, can have a non-zero Content-Length header field even though + * no content is included in DATA frames. + */ + if (h3s->data_len > h3s->body_len || + (fin && h3s->data_len < h3s->body_len)) { + TRACE_ERROR("Content-length does not match DATA frame size", H3_EV_RX_FRAME|H3_EV_RX_DATA, qcs->qcc->conn, qcs); + ret = -1; + } + + TRACE_LEAVE(H3_EV_RX_FRAME, qcs->qcc->conn, qcs); + return ret; +} + +/* Parse from buffer <buf> a H3 HEADERS frame of length <len>. Data are copied + * in a local HTX buffer and transfer to the stream connector layer. <fin> must be + * set if this is the last data to transfer from this stream. + * + * Returns the number of consumed bytes or a negative error code. + */ +static ssize_t h3_headers_to_htx(struct qcs *qcs, const struct buffer *buf, + uint64_t len, char fin) +{ + struct h3s *h3s = qcs->ctx; + struct h3c *h3c = h3s->h3c; + struct buffer htx_buf = BUF_NULL; + struct buffer *tmp = get_trash_chunk(); + struct htx *htx = NULL; + struct htx_sl *sl; + struct http_hdr list[global.tune.max_http_hdr]; + unsigned int flags = HTX_SL_F_NONE; + struct ist meth = IST_NULL, path = IST_NULL; + struct ist scheme = IST_NULL, authority = IST_NULL; + int hdr_idx, ret; + int cookie = -1, last_cookie = -1, i; + + /* RFC 9114 4.1.2. Malformed Requests and Responses + * + * A malformed request or response is one that is an otherwise valid + * sequence of frames but is invalid due to: + * - the presence of prohibited fields or pseudo-header fields, + * - the absence of mandatory pseudo-header fields, + * - invalid values for pseudo-header fields, + * - pseudo-header fields after fields, + * - an invalid sequence of HTTP messages, + * - the inclusion of uppercase field names, or + * - the inclusion of invalid characters in field names or values. + * + * [...] + * + * Intermediaries that process HTTP requests or responses (i.e., any + * intermediary not acting as a tunnel) MUST NOT forward a malformed + * request or response. Malformed requests or responses that are + * detected MUST be treated as a stream error of type H3_MESSAGE_ERROR. + */ + + TRACE_ENTER(H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + + /* TODO support trailer parsing in this function */ + + /* TODO support buffer wrapping */ + BUG_ON(b_head(buf) + len >= b_wrap(buf)); + ret = qpack_decode_fs((const unsigned char *)b_head(buf), len, tmp, + list, sizeof(list) / sizeof(list[0])); + if (ret < 0) { + TRACE_ERROR("QPACK decoding error", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + h3c->err = -ret; + len = -1; + goto out; + } + + qc_get_buf(qcs, &htx_buf); + BUG_ON(!b_size(&htx_buf)); /* TODO */ + htx = htx_from_buf(&htx_buf); + + /* first treat pseudo-header to build the start line */ + hdr_idx = 0; + while (1) { + /* RFC 9114 4.3. HTTP Control Data + * + * Endpoints MUST treat a request or response that contains + * undefined or invalid pseudo-header fields as malformed. + * + * All pseudo-header fields MUST appear in the header section before + * regular header fields. Any request or response that contains a + * pseudo-header field that appears in a header section after a regular + * header field MUST be treated as malformed. + */ + + /* Stop at first non pseudo-header. */ + if (!istmatch(list[hdr_idx].n, ist(":"))) + break; + + /* pseudo-header. Malformed name with uppercase character or + * invalid token will be rejected in the else clause. + */ + if (isteq(list[hdr_idx].n, ist(":method"))) { + if (isttest(meth)) { + TRACE_ERROR("duplicated method pseudo-header", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + meth = list[hdr_idx].v; + } + else if (isteq(list[hdr_idx].n, ist(":path"))) { + if (isttest(path)) { + TRACE_ERROR("duplicated path pseudo-header", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + path = list[hdr_idx].v; + } + else if (isteq(list[hdr_idx].n, ist(":scheme"))) { + if (isttest(scheme)) { + /* duplicated pseudo-header */ + TRACE_ERROR("duplicated scheme pseudo-header", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + scheme = list[hdr_idx].v; + } + else if (isteq(list[hdr_idx].n, ist(":authority"))) { + if (isttest(authority)) { + TRACE_ERROR("duplicated authority pseudo-header", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + authority = list[hdr_idx].v; + } + else { + TRACE_ERROR("unknown pseudo-header", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + + ++hdr_idx; + } + + if (!istmatch(meth, ist("CONNECT"))) { + /* RFC 9114 4.3.1. Request Pseudo-Header Fields + * + * All HTTP/3 requests MUST include exactly one value for the :method, + * :scheme, and :path pseudo-header fields, unless the request is a + * CONNECT request; see Section 4.4. + */ + if (!isttest(meth) || !isttest(scheme) || !isttest(path)) { + TRACE_ERROR("missing mandatory pseudo-header", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + } + + flags |= HTX_SL_F_VER_11; + flags |= HTX_SL_F_XFER_LEN; + + sl = htx_add_stline(htx, HTX_BLK_REQ_SL, flags, meth, path, ist("HTTP/3.0")); + if (!sl) { + h3c->err = H3_INTERNAL_ERROR; + len = -1; + goto out; + } + + if (fin) + sl->flags |= HTX_SL_F_BODYLESS; + + sl->info.req.meth = find_http_meth(meth.ptr, meth.len); + + if (isttest(authority)) + htx_add_header(htx, ist("host"), authority); + + /* now treat standard headers */ + while (1) { + if (isteq(list[hdr_idx].n, ist(""))) + break; + + if (istmatch(list[hdr_idx].n, ist(":"))) { + TRACE_ERROR("pseudo-header field after fields", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + + for (i = 0; i < list[hdr_idx].n.len; ++i) { + const char c = list[hdr_idx].n.ptr[i]; + if ((uint8_t)(c - 'A') < 'Z' - 'A' || !HTTP_IS_TOKEN(c)) { + TRACE_ERROR("invalid characters in field name", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + } + + if (isteq(list[hdr_idx].n, ist("cookie"))) { + http_cookie_register(list, hdr_idx, &cookie, &last_cookie); + ++hdr_idx; + continue; + } + else if (isteq(list[hdr_idx].n, ist("content-length"))) { + ret = http_parse_cont_len_header(&list[hdr_idx].v, + &h3s->body_len, + h3s->flags & H3_SF_HAVE_CLEN); + if (ret < 0) { + TRACE_ERROR("invalid content-length", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + else if (!ret) { + /* Skip duplicated value. */ + ++hdr_idx; + continue; + } + + h3s->flags |= H3_SF_HAVE_CLEN; + /* This will fail if current frame is the last one and + * content-length is not null. + */ + if (h3_check_body_size(qcs, fin)) { + len = -1; + goto out; + } + } + else if (isteq(list[hdr_idx].n, ist("connection")) || + isteq(list[hdr_idx].n, ist("proxy-connection")) || + isteq(list[hdr_idx].n, ist("keep-alive")) || + isteq(list[hdr_idx].n, ist("transfer-encoding"))) { + /* RFC 9114 4.2. HTTP Fields + * + * HTTP/3 does not use the Connection header field to indicate + * connection-specific fields; in this protocol, connection- + * specific metadata is conveyed by other means. An endpoint + * MUST NOT generate an HTTP/3 field section containing + * connection-specific fields; any message containing + * connection-specific fields MUST be treated as malformed. + */ + TRACE_ERROR("invalid connection header", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + else if (isteq(list[hdr_idx].n, ist("te")) && + !isteq(list[hdr_idx].v, ist("trailers"))) { + /* RFC 9114 4.2. HTTP Fields + * + * The only exception to this is the TE header field, which MAY + * be present in an HTTP/3 request header; when it is, it MUST + * NOT contain any value other than "trailers". + */ + TRACE_ERROR("invalid te header", H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + len = -1; + goto out; + } + + htx_add_header(htx, list[hdr_idx].n, list[hdr_idx].v); + ++hdr_idx; + } + + if (cookie >= 0) { + if (http_cookie_merge(htx, list, cookie)) { + h3c->err = H3_INTERNAL_ERROR; + len = -1; + goto out; + } + } + + htx_add_endof(htx, HTX_BLK_EOH); + if (fin) + htx->flags |= HTX_FL_EOM; + + htx_to_buf(htx, &htx_buf); + htx = NULL; + + if (!qc_attach_sc(qcs, &htx_buf)) { + h3c->err = H3_INTERNAL_ERROR; + len = -1; + goto out; + } + + /* RFC 9114 5.2. Connection Shutdown + * + * The GOAWAY frame contains an identifier that + * indicates to the receiver the range of requests or pushes that were + * or might be processed in this connection. The server sends a client- + * initiated bidirectional stream ID; the client sends a push ID. + * Requests or pushes with the indicated identifier or greater are + * rejected (Section 4.1.1) by the sender of the GOAWAY. This + * identifier MAY be zero if no requests or pushes were processed. + */ + if (qcs->id >= h3c->id_goaway) + h3c->id_goaway = qcs->id + 4; + + out: + /* HTX may be non NULL if error before previous htx_to_buf(). */ + if (htx) + htx_to_buf(htx, &htx_buf); + + /* buffer is transferred to the stream connector and set to NULL + * except on stream creation error. + */ + if (b_size(&htx_buf)) { + b_free(&htx_buf); + offer_buffers(NULL, 1); + } + + TRACE_LEAVE(H3_EV_RX_FRAME|H3_EV_RX_HDR, qcs->qcc->conn, qcs); + return len; +} + +/* Copy from buffer <buf> a H3 DATA frame of length <len> in QUIC stream <qcs> + * HTX buffer. <fin> must be set if this is the last data to transfer from this + * stream. + * + * Returns the number of consumed bytes or a negative error code. + */ +static ssize_t h3_data_to_htx(struct qcs *qcs, const struct buffer *buf, + uint64_t len, char fin) +{ + struct buffer *appbuf; + struct htx *htx = NULL; + size_t htx_sent = 0; + int htx_space; + char *head; + + TRACE_ENTER(H3_EV_RX_FRAME|H3_EV_RX_DATA, qcs->qcc->conn, qcs); + + appbuf = qc_get_buf(qcs, &qcs->rx.app_buf); + BUG_ON(!appbuf); + htx = htx_from_buf(appbuf); + + if (len > b_data(buf)) { + len = b_data(buf); + fin = 0; + } + + head = b_head(buf); + retry: + htx_space = htx_free_data_space(htx); + if (!htx_space) { + qcs->flags |= QC_SF_DEM_FULL; + goto out; + } + + if (len > htx_space) { + len = htx_space; + fin = 0; + } + + if (head + len > b_wrap(buf)) { + size_t contig = b_wrap(buf) - head; + htx_sent = htx_add_data(htx, ist2(b_head(buf), contig)); + if (htx_sent < contig) { + qcs->flags |= QC_SF_DEM_FULL; + goto out; + } + + len -= contig; + head = b_orig(buf); + goto retry; + } + + htx_sent += htx_add_data(htx, ist2(head, len)); + if (htx_sent < len) { + qcs->flags |= QC_SF_DEM_FULL; + goto out; + } + + if (fin && len == htx_sent) + htx->flags |= HTX_FL_EOM; + + out: + htx_to_buf(htx, appbuf); + + TRACE_LEAVE(H3_EV_RX_FRAME|H3_EV_RX_DATA, qcs->qcc->conn, qcs); + return htx_sent; +} + +/* Parse a SETTINGS frame of length <len> of payload <buf>. + * + * Returns the number of consumed bytes or a negative error code. + */ +static ssize_t h3_parse_settings_frm(struct h3c *h3c, const struct buffer *buf, + size_t len) +{ + struct buffer b; + uint64_t id, value; + size_t ret = 0; + long mask = 0; /* used to detect duplicated settings identifier */ + + TRACE_ENTER(H3_EV_RX_FRAME|H3_EV_RX_SETTINGS, h3c->qcc->conn); + + /* Work on a copy of <buf>. */ + b = b_make(b_orig(buf), b_size(buf), b_head_ofs(buf), len); + + while (b_data(&b)) { + if (!b_quic_dec_int(&id, &b, &ret) || !b_quic_dec_int(&value, &b, &ret)) { + h3c->err = H3_FRAME_ERROR; + return -1; + } + + h3_debug_printf(stderr, "%s id: %llu value: %llu\n", + __func__, (unsigned long long)id, (unsigned long long)value); + + /* draft-ietf-quic-http34 7.2.4. SETTINGS + * + * The same setting identifier MUST NOT occur more than once in the + * SETTINGS frame. A receiver MAY treat the presence of duplicate + * setting identifiers as a connection error of type H3_SETTINGS_ERROR. + */ + + /* Ignore duplicate check for ID too big used for GREASE. */ + if (id < sizeof(mask)) { + if (ha_bit_test(id, &mask)) { + h3c->err = H3_SETTINGS_ERROR; + return -1; + } + ha_bit_set(id, &mask); + } + + switch (id) { + case H3_SETTINGS_QPACK_MAX_TABLE_CAPACITY: + h3c->qpack_max_table_capacity = value; + break; + case H3_SETTINGS_MAX_FIELD_SECTION_SIZE: + h3c->max_field_section_size = value; + break; + case H3_SETTINGS_QPACK_BLOCKED_STREAMS: + h3c->qpack_blocked_streams = value; + break; + + case H3_SETTINGS_RESERVED_0: + case H3_SETTINGS_RESERVED_2: + case H3_SETTINGS_RESERVED_3: + case H3_SETTINGS_RESERVED_4: + case H3_SETTINGS_RESERVED_5: + /* draft-ietf-quic-http34 7.2.4.1. Defined SETTINGS Parameters + * + * Setting identifiers which were defined in [HTTP2] where there is no + * corresponding HTTP/3 setting have also been reserved + * (Section 11.2.2). These reserved settings MUST NOT be sent, and + * their receipt MUST be treated as a connection error of type + * H3_SETTINGS_ERROR. + */ + h3c->err = H3_SETTINGS_ERROR; + return -1; + default: + /* MUST be ignored */ + break; + } + } + + TRACE_LEAVE(H3_EV_RX_FRAME|H3_EV_RX_SETTINGS, h3c->qcc->conn); + return ret; +} + +/* Decode <qcs> remotely initiated bidi-stream. <fin> must be set to indicate + * that we received the last data of the stream. + * + * Returns 0 on success else non-zero. + */ +static ssize_t h3_decode_qcs(struct qcs *qcs, struct buffer *b, int fin) +{ + struct h3s *h3s = qcs->ctx; + struct h3c *h3c = h3s->h3c; + ssize_t total = 0, ret; + + h3_debug_printf(stderr, "%s: STREAM ID: %lu\n", __func__, qcs->id); + + if (quic_stream_is_uni(qcs->id) && !(h3s->flags & H3_SF_UNI_INIT)) { + ret = h3_init_uni_stream(h3c, qcs, b); + if (ret < 0) { + return -1; + } + else if (!ret) { + /* not enough data to initialize uni stream, retry later */ + return 0; + } + + total += ret; + } + + if (quic_stream_is_uni(qcs->id) && (h3s->flags & H3_SF_UNI_NO_H3)) { + /* For non-h3 STREAM, parse it and return immediately. */ + if ((ret = h3_parse_uni_stream_no_h3(qcs, b, fin)) < 0) + return -1; + + total += ret; + return total; + } + + /* RFC 9114 6.2.1. Control Streams + * + * The sender MUST NOT close the control stream, and the receiver MUST NOT + * request that the sender close the control stream. If either control + * stream is closed at any point, this MUST be treated as a connection + * error of type H3_CLOSED_CRITICAL_STREAM. + */ + if (h3s->type == H3S_T_CTRL && fin) { + qcc_emit_cc_app(qcs->qcc, H3_CLOSED_CRITICAL_STREAM, 1); + return -1; + } + + if (!b_data(b) && fin && quic_stream_is_bidi(qcs->id)) { + qcs_http_handle_standalone_fin(qcs); + return 0; + } + + while (b_data(b) && !(qcs->flags & QC_SF_DEM_FULL)) { + uint64_t ftype, flen; + char last_stream_frame = 0; + + if (!h3s->demux_frame_len) { + /* Switch to a new frame. */ + size_t hlen = h3_decode_frm_header(&ftype, &flen, b); + if (!hlen) + break; + + h3_debug_printf(stderr, "%s: ftype: %lu, flen: %lu\n", + __func__, ftype, flen); + + h3s->demux_frame_type = ftype; + h3s->demux_frame_len = flen; + total += hlen; + + /* Check that content-length is not exceeded on a new DATA frame. */ + if (ftype == H3_FT_DATA) { + h3s->data_len += flen; + if (h3s->flags & H3_SF_HAVE_CLEN && h3_check_body_size(qcs, fin)) { + qcc_emit_cc_app(qcs->qcc, h3c->err, 1); + return -1; + } + } + + if (!h3_is_frame_valid(h3c, qcs, ftype)) { + qcc_emit_cc_app(qcs->qcc, H3_FRAME_UNEXPECTED, 1); + return -1; + } + + if (!b_data(b)) + break; + } + + flen = h3s->demux_frame_len; + ftype = h3s->demux_frame_type; + + /* Do not demux incomplete frames except H3 DATA which can be + * fragmented in multiple HTX blocks. + */ + if (flen > b_data(b) && ftype != H3_FT_DATA) { + /* Reject frames bigger than bufsize. + * + * TODO HEADERS should in complement be limited with H3 + * SETTINGS_MAX_FIELD_SECTION_SIZE parameter to prevent + * excessive decompressed size. + */ + if (flen > QC_S_RX_BUF_SZ) { + qcc_emit_cc_app(qcs->qcc, H3_EXCESSIVE_LOAD, 1); + return -1; + } + break; + } + + /* Check content-length equality with DATA frames length on the last frame. */ + if (fin && h3s->flags & H3_SF_HAVE_CLEN && h3_check_body_size(qcs, fin)) { + qcc_emit_cc_app(qcs->qcc, h3c->err, 1); + return -1; + } + + last_stream_frame = (fin && flen == b_data(b)); + + h3_inc_frame_type_cnt(h3c->prx_counters, ftype); + switch (ftype) { + case H3_FT_DATA: + ret = h3_data_to_htx(qcs, b, flen, last_stream_frame); + /* TODO handle error reporting. Stream closure required. */ + if (ret < 0) { ABORT_NOW(); } + h3s->st_req = H3S_ST_REQ_DATA; + break; + case H3_FT_HEADERS: + ret = h3_headers_to_htx(qcs, b, flen, last_stream_frame); + if (ret < 0) { + /* TODO for some error, it may be preferable to + * only close the stream once RESET_STREAM is + * supported. + */ + qcc_emit_cc_app(qcs->qcc, h3c->err, 1); + return -1; + } + h3s->st_req = (h3s->st_req == H3S_ST_REQ_BEFORE) ? + H3S_ST_REQ_HEADERS : H3S_ST_REQ_TRAILERS; + break; + case H3_FT_CANCEL_PUSH: + case H3_FT_PUSH_PROMISE: + case H3_FT_MAX_PUSH_ID: + case H3_FT_GOAWAY: + /* Not supported */ + ret = flen; + break; + case H3_FT_SETTINGS: + ret = h3_parse_settings_frm(qcs->qcc->ctx, b, flen); + if (ret < 0) { + qcc_emit_cc_app(qcs->qcc, h3c->err, 1); + return -1; + } + h3c->flags |= H3_CF_SETTINGS_RECV; + break; + default: + /* draft-ietf-quic-http34 9. Extensions to HTTP/3 + * + * Implementations MUST discard frames [...] that have unknown + * or unsupported types. + */ + h3_debug_printf(stderr, "ignore unknown frame type 0x%lx\n", ftype); + ret = flen; + break; + } + + if (ret) { + BUG_ON(h3s->demux_frame_len < ret); + h3s->demux_frame_len -= ret; + b_del(b, ret); + total += ret; + } + } + + /* TODO may be useful to wakeup the MUX if blocked due to full buffer. + * However, currently, io-cb of MUX does not handle Rx. + */ + + return total; +} + +/* Returns buffer for data sending. + * May be NULL if the allocation failed. + */ +static struct buffer *mux_get_buf(struct qcs *qcs) +{ + if (!b_size(&qcs->tx.buf)) + b_alloc(&qcs->tx.buf); + + return &qcs->tx.buf; +} + +/* Function used to emit stream data from <qcs> control uni-stream */ +static int h3_control_send(struct qcs *qcs, void *ctx) +{ + int ret; + struct h3c *h3c = ctx; + unsigned char data[(2 + 3) * 2 * QUIC_VARINT_MAX_SIZE]; /* enough for 3 settings */ + struct buffer pos, *res; + size_t frm_len; + + TRACE_ENTER(H3_EV_TX_SETTINGS, qcs->qcc->conn, qcs); + + BUG_ON_HOT(h3c->flags & H3_CF_SETTINGS_SENT); + + ret = 0; + pos = b_make((char *)data, sizeof(data), 0, 0); + + frm_len = quic_int_getsize(H3_SETTINGS_QPACK_MAX_TABLE_CAPACITY) + + quic_int_getsize(h3_settings_qpack_max_table_capacity) + + quic_int_getsize(H3_SETTINGS_QPACK_BLOCKED_STREAMS) + + quic_int_getsize(h3_settings_qpack_blocked_streams); + if (h3_settings_max_field_section_size) { + frm_len += quic_int_getsize(H3_SETTINGS_MAX_FIELD_SECTION_SIZE) + + quic_int_getsize(h3_settings_max_field_section_size); + } + + b_quic_enc_int(&pos, H3_UNI_S_T_CTRL); + /* Build a SETTINGS frame */ + b_quic_enc_int(&pos, H3_FT_SETTINGS); + b_quic_enc_int(&pos, frm_len); + b_quic_enc_int(&pos, H3_SETTINGS_QPACK_MAX_TABLE_CAPACITY); + b_quic_enc_int(&pos, h3_settings_qpack_max_table_capacity); + b_quic_enc_int(&pos, H3_SETTINGS_QPACK_BLOCKED_STREAMS); + b_quic_enc_int(&pos, h3_settings_qpack_blocked_streams); + if (h3_settings_max_field_section_size) { + b_quic_enc_int(&pos, H3_SETTINGS_MAX_FIELD_SECTION_SIZE); + b_quic_enc_int(&pos, h3_settings_max_field_section_size); + } + + res = mux_get_buf(qcs); + if (b_room(res) < b_data(&pos)) { + // TODO the mux should be put in blocked state, with + // the stream in state waiting for settings to be sent + ABORT_NOW(); + } + + ret = b_force_xfer(res, &pos, b_data(&pos)); + if (ret > 0) + h3c->flags |= H3_CF_SETTINGS_SENT; + + TRACE_LEAVE(H3_EV_TX_SETTINGS, qcs->qcc->conn, qcs); + return ret; +} + +static int h3_resp_headers_send(struct qcs *qcs, struct htx *htx) +{ + struct buffer outbuf; + struct buffer headers_buf = BUF_NULL; + struct buffer *res; + struct http_hdr list[global.tune.max_http_hdr]; + struct htx_sl *sl; + struct htx_blk *blk; + enum htx_blk_type type; + int frame_length_size; /* size in bytes of frame length varint field */ + int ret = 0; + int hdr; + int status = 0; + + TRACE_ENTER(H3_EV_TX_HDR, qcs->qcc->conn, qcs); + + 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_RES_SL) { + /* start-line -> HEADERS h3 frame */ + BUG_ON(sl); + sl = htx_get_blk_ptr(htx, blk); + /* TODO should be on h3 layer */ + status = sl->info.res.status; + } + else if (type == HTX_BLK_HDR) { + if (unlikely(hdr >= sizeof(list) / sizeof(list[0]) - 1)) + goto err; + list[hdr].n = htx_get_blk_name(htx, blk); + list[hdr].v = htx_get_blk_value(htx, blk); + hdr++; + } + else { + ABORT_NOW(); + goto err; + } + } + + BUG_ON(!sl); + + list[hdr].n = ist(""); + + res = mux_get_buf(qcs); + + /* At least 5 bytes to store frame type + length as a varint max size */ + if (b_room(res) < 5) + ABORT_NOW(); + + b_reset(&outbuf); + outbuf = b_make(b_tail(res), b_contig_space(res), 0, 0); + /* Start the headers after frame type + length */ + headers_buf = b_make(b_head(res) + 5, b_size(res) - 5, 0, 0); + + if (qpack_encode_field_section_line(&headers_buf)) + ABORT_NOW(); + if (qpack_encode_int_status(&headers_buf, status)) + ABORT_NOW(); + + for (hdr = 0; hdr < sizeof(list) / sizeof(list[0]); ++hdr) { + if (isteq(list[hdr].n, ist(""))) + break; + + /* RFC 9114 4.2. HTTP Fields + * + * An intermediary transforming an HTTP/1.x message to HTTP/3 + * MUST remove connection-specific header fields as discussed in + * Section 7.6.1 of [HTTP], or their messages will be treated by + * other HTTP/3 endpoints as malformed. + */ + 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("transfer-encoding"))) { + continue; + } + else if (isteq(list[hdr].n, ist("te"))) { + /* "te" may only be sent with "trailers" if this value + * is present, otherwise it must be deleted. + */ + const struct ist v = istist(list[hdr].v, ist("trailers")); + if (!isttest(v) || (v.len > 8 && v.ptr[8] != ',')) + continue; + list[hdr].v = ist("trailers"); + } + + if (qpack_encode_header(&headers_buf, list[hdr].n, list[hdr].v)) + ABORT_NOW(); + } + + /* Now that all headers are encoded, we are certain that res buffer is + * big enough + */ + frame_length_size = quic_int_getsize(b_data(&headers_buf)); + res->head += 4 - frame_length_size; + b_putchr(res, 0x01); /* h3 HEADERS frame type */ + if (!b_quic_enc_int(res, b_data(&headers_buf))) + ABORT_NOW(); + b_add(res, b_data(&headers_buf)); + + 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); + if (type == HTX_BLK_EOH) + break; + } + + TRACE_LEAVE(H3_EV_TX_HDR, qcs->qcc->conn, qcs); + return ret; + + err: + TRACE_DEVEL("leaving on error", H3_EV_TX_HDR, qcs->qcc->conn, qcs); + return 0; +} + +/* Returns the total of bytes sent. */ +static int h3_resp_data_send(struct qcs *qcs, struct htx *htx, size_t count) +{ + struct buffer outbuf; + struct buffer *res; + size_t total = 0; + int bsize, fsize, hsize; + struct htx_blk *blk; + enum htx_blk_type type; + + TRACE_ENTER(H3_EV_TX_DATA, qcs->qcc->conn, qcs); + + new_frame: + if (!count || htx_is_empty(htx)) + goto end; + + blk = htx_get_head_blk(htx); + type = htx_get_blk_type(blk); + fsize = bsize = htx_get_blksz(blk); + + if (type != HTX_BLK_DATA) + goto end; + + res = mux_get_buf(qcs); + + if (fsize > count) + fsize = count; + + /* h3 DATA headers : 1-byte frame type + varint frame length */ + hsize = 1 + QUIC_VARINT_MAX_SIZE; + + while (1) { + b_reset(&outbuf); + outbuf = b_make(b_tail(res), b_contig_space(res), 0, 0); + if (b_size(&outbuf) > hsize || !b_space_wraps(res)) + break; + b_slow_realign(res, trash.area, b_data(res)); + } + + /* Not enough room for headers and at least one data byte, block the + * stream. It is expected that the stream connector layer will subscribe + * on SEND. + */ + if (b_size(&outbuf) <= hsize) { + qcs->flags |= QC_SF_BLK_MROOM; + goto end; + } + + if (b_size(&outbuf) < hsize + fsize) + fsize = b_size(&outbuf) - hsize; + BUG_ON(fsize <= 0); + + b_putchr(&outbuf, 0x00); /* h3 frame type = DATA */ + b_quic_enc_int(&outbuf, fsize); /* h3 frame length */ + + b_putblk(&outbuf, htx_get_blk_ptr(htx, blk), fsize); + total += fsize; + count -= fsize; + + if (fsize == bsize) + htx_remove_blk(htx, blk); + else + htx_cut_data_blk(htx, blk, fsize); + + /* commit the buffer */ + b_add(res, b_data(&outbuf)); + goto new_frame; + + end: + TRACE_LEAVE(H3_EV_TX_DATA, qcs->qcc->conn, qcs); + return total; +} + +static size_t h3_snd_buf(struct qcs *qcs, struct htx *htx, size_t count) +{ + size_t total = 0; + enum htx_blk_type btype; + struct htx_blk *blk; + uint32_t bsize; + int32_t idx; + int ret; + + h3_debug_printf(stderr, "%s\n", __func__); + + while (count && !htx_is_empty(htx) && !(qcs->flags & QC_SF_BLK_MROOM)) { + idx = htx_get_head(htx); + blk = htx_get_blk(htx, idx); + btype = htx_get_blk_type(blk); + bsize = htx_get_blksz(blk); + + /* Not implemented : QUIC on backend side */ + BUG_ON(btype == HTX_BLK_REQ_SL); + + switch (btype) { + case HTX_BLK_RES_SL: + /* start-line -> HEADERS h3 frame */ + ret = h3_resp_headers_send(qcs, htx); + if (ret > 0) { + total += ret; + count -= ret; + if (ret < bsize) + goto out; + } + break; + + case HTX_BLK_DATA: + ret = h3_resp_data_send(qcs, htx, count); + if (ret > 0) { + total += ret; + count -= ret; + if (ret < bsize) + goto out; + } + break; + + case HTX_BLK_TLR: + case HTX_BLK_EOT: + /* TODO trailers */ + + default: + htx_remove_blk(htx, blk); + total += bsize; + count -= bsize; + break; + } + } + + out: + return total; +} + +/* Notify about a closure on <qcs> stream requested by the remote peer. + * + * Stream channel <side> is explained relative to our endpoint : WR for + * STOP_SENDING or RD for RESET_STREAM reception. Callback decode_qcs() is used + * instead for closure performed using a STREAM frame with FIN bit. + * + * The main objective of this function is to check if closure is valid + * according to HTTP/3 specification. + * + * Returns 0 on success else non-zero. A CONNECTION_CLOSE is generated on + * error. + */ +static int h3_close(struct qcs *qcs, enum qcc_app_ops_close_side side) +{ + struct h3s *h3s = qcs->ctx; + struct h3c *h3c = h3s->h3c;; + + /* RFC 9114 6.2.1. Control Streams + * + * The sender + * MUST NOT close the control stream, and the receiver MUST NOT + * request that the sender close the control stream. If either + * control stream is closed at any point, this MUST be treated + * as a connection error of type H3_CLOSED_CRITICAL_STREAM. + */ + if (qcs == h3c->ctrl_strm) { + TRACE_ERROR("closure detected on control stream", H3_EV_H3S_END, qcs->qcc->conn, qcs); + qcc_emit_cc_app(qcs->qcc, H3_CLOSED_CRITICAL_STREAM, 1); + return 1; + } + + return 0; +} + +static int h3_attach(struct qcs *qcs, void *conn_ctx) +{ + struct h3s *h3s; + + TRACE_ENTER(H3_EV_H3S_NEW, qcs->qcc->conn, qcs); + + h3s = pool_alloc(pool_head_h3s); + if (!h3s) + return 1; + + qcs->ctx = h3s; + h3s->h3c = conn_ctx; + + h3s->demux_frame_len = 0; + h3s->demux_frame_type = 0; + h3s->body_len = 0; + h3s->data_len = 0; + h3s->flags = 0; + + if (quic_stream_is_bidi(qcs->id)) { + h3s->type = H3S_T_REQ; + h3s->st_req = H3S_ST_REQ_BEFORE; + qcs_wait_http_req(qcs); + } + else { + /* stream type must be decoded for unidirectional streams */ + h3s->type = H3S_T_UNKNOWN; + } + + TRACE_LEAVE(H3_EV_H3S_NEW, qcs->qcc->conn, qcs); + return 0; +} + +static void h3_detach(struct qcs *qcs) +{ + struct h3s *h3s = qcs->ctx; + + TRACE_ENTER(H3_EV_H3S_END, qcs->qcc->conn, qcs); + + pool_free(pool_head_h3s, h3s); + qcs->ctx = NULL; + + TRACE_LEAVE(H3_EV_H3S_END, qcs->qcc->conn, qcs); +} + +static int h3_finalize(void *ctx) +{ + struct h3c *h3c = ctx; + struct qcs *qcs; + + qcs = qcc_init_stream_local(h3c->qcc, 0); + if (!qcs) + return 0; + + h3_control_send(qcs, h3c); + h3c->ctrl_strm = qcs; + + return 1; +} + +/* Generate a GOAWAY frame for <h3c> connection on the control stream. + * + * Returns 0 on success else non-zero. + */ +static int h3_send_goaway(struct h3c *h3c) +{ + struct qcs *qcs = h3c->ctrl_strm; + struct buffer pos, *res; + unsigned char data[3 * QUIC_VARINT_MAX_SIZE]; + size_t frm_len = quic_int_getsize(h3c->id_goaway); + + if (!qcs) + return 1; + + pos = b_make((char *)data, sizeof(data), 0, 0); + + b_quic_enc_int(&pos, H3_FT_GOAWAY); + b_quic_enc_int(&pos, frm_len); + b_quic_enc_int(&pos, h3c->id_goaway); + + res = mux_get_buf(qcs); + if (!res || b_room(res) < b_data(&pos)) { + /* Do not try forcefully to emit GOAWAY if no space left. */ + return 1; + } + + b_force_xfer(res, &pos, b_data(&pos)); + + return 0; +} + +/* Initialize the HTTP/3 context for <qcc> mux. + * Return 1 if succeeded, 0 if not. + */ +static int h3_init(struct qcc *qcc) +{ + struct h3c *h3c; + struct quic_conn *qc = qcc->conn->handle.qc; + + h3c = pool_alloc(pool_head_h3c); + if (!h3c) + goto fail_no_h3; + + h3c->qcc = qcc; + h3c->ctrl_strm = NULL; + h3c->err = H3_NO_ERROR; + h3c->flags = 0; + h3c->id_goaway = 0; + + qcc->ctx = h3c; + /* TODO cleanup only ref to quic_conn */ + h3c->prx_counters = + EXTRA_COUNTERS_GET(qc->li->bind_conf->frontend->extra_counters_fe, + &h3_stats_module); + LIST_INIT(&h3c->buf_wait.list); + + return 1; + + fail_no_h3: + return 0; +} + +/* Send a HTTP/3 GOAWAY followed by a CONNECTION_CLOSE_APP. */ +static void h3_shutdown(void *ctx) +{ + struct h3c *h3c = ctx; + + /* RFC 9114 5.2. Connection Shutdown + * + * Even when a connection is not idle, either endpoint can decide to + * stop using the connection and initiate a graceful connection close. + * Endpoints initiate the graceful shutdown of an HTTP/3 connection by + * sending a GOAWAY frame. + */ + h3_send_goaway(h3c); + + /* RFC 9114 5.2. Connection Shutdown + * + * An endpoint that completes a + * graceful shutdown SHOULD use the H3_NO_ERROR error code when closing + * the connection. + */ + qcc_emit_cc_app(h3c->qcc, H3_NO_ERROR, 0); +} + +static void h3_release(void *ctx) +{ + struct h3c *h3c = ctx; + pool_free(pool_head_h3c, h3c); +} + +/* Increment the h3 error code counters for <error_code> value */ +static void h3_stats_inc_err_cnt(void *ctx, int err_code) +{ + struct h3c *h3c = ctx; + + h3_inc_err_cnt(h3c->prx_counters, err_code); +} + +/* h3 trace handler */ +static void h3_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 qcc *qcc = conn ? conn->ctx : NULL; + const struct qcs *qcs = a2; + + if (!qcc) + return; + + if (src->verbosity > H3_VERB_CLEAN) { + chunk_appendf(&trace_buf, " : qcc=%p(F)", qcc); + if (qcc->conn->handle.qc) + chunk_appendf(&trace_buf, " qc=%p", qcc->conn->handle.qc); + + if (qcs) + chunk_appendf(&trace_buf, " qcs=%p(%llu)", qcs, (ull)qcs->id); + } +} + +/* HTTP/3 application layer operations */ +const struct qcc_app_ops h3_ops = { + .init = h3_init, + .attach = h3_attach, + .decode_qcs = h3_decode_qcs, + .snd_buf = h3_snd_buf, + .close = h3_close, + .detach = h3_detach, + .finalize = h3_finalize, + .shutdown = h3_shutdown, + .inc_err_cnt = h3_stats_inc_err_cnt, + .release = h3_release, +}; |