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Diffstat (limited to '')
| -rw-r--r-- | src/mux_pt.c | 904 |
1 files changed, 904 insertions, 0 deletions
diff --git a/src/mux_pt.c b/src/mux_pt.c new file mode 100644 index 0000000..3cca6a1 --- /dev/null +++ b/src/mux_pt.c @@ -0,0 +1,904 @@ +/* + * Pass-through 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 <haproxy/api.h> +#include <haproxy/buf.h> +#include <haproxy/cfgparse.h> +#include <haproxy/connection.h> +#include <haproxy/pipe.h> +#include <haproxy/stconn.h> +#include <haproxy/stream.h> +#include <haproxy/task.h> +#include <haproxy/trace.h> +#include <haproxy/xref.h> + +struct mux_pt_ctx { + struct sedesc *sd; + struct connection *conn; + struct wait_event wait_event; +}; + +DECLARE_STATIC_POOL(pool_head_pt_ctx, "mux_pt", sizeof(struct mux_pt_ctx)); + +/* trace source and events */ +static void pt_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 : + * pt_ctx - internal PT context + * strm - application layer + */ +static const struct trace_event pt_trace_events[] = { +#define PT_EV_CONN_NEW (1ULL << 0) + { .mask = PT_EV_CONN_NEW, .name = "pt_conn_new", .desc = "new PT connection" }, +#define PT_EV_CONN_WAKE (1ULL << 1) + { .mask = PT_EV_CONN_WAKE, .name = "pt_conn_wake", .desc = "PT connection woken up" }, +#define PT_EV_CONN_END (1ULL << 2) + { .mask = PT_EV_CONN_END, .name = "pt_conn_end", .desc = "PT connection terminated" }, +#define PT_EV_CONN_ERR (1ULL << 3) + { .mask = PT_EV_CONN_ERR, .name = "pt_conn_err", .desc = "error on PT connection" }, +#define PT_EV_STRM_NEW (1ULL << 4) + { .mask = PT_EV_STRM_NEW, .name = "strm_new", .desc = "app-layer stream creation" }, +#define PT_EV_STRM_SHUT (1ULL << 5) + { .mask = PT_EV_STRM_SHUT, .name = "strm_shut", .desc = "stream shutdown" }, +#define PT_EV_STRM_END (1ULL << 6) + { .mask = PT_EV_STRM_END, .name = "strm_end", .desc = "detaching app-layer stream" }, +#define PT_EV_STRM_ERR (1ULL << 7) + { .mask = PT_EV_STRM_ERR, .name = "strm_err", .desc = "stream error" }, +#define PT_EV_RX_DATA (1ULL << 8) + { .mask = PT_EV_RX_DATA, .name = "pt_rx_data", .desc = "Rx on PT connection" }, +#define PT_EV_TX_DATA (1ULL << 9) + { .mask = PT_EV_TX_DATA, .name = "pt_tx_data", .desc = "Tx on PT connection" }, + + {} +}; + + +static const struct name_desc pt_trace_decoding[] = { +#define PT_VERB_CLEAN 1 + { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" }, +#define PT_VERB_MINIMAL 2 + { .name="minimal", .desc="report only h1c/h1s state and flags, no real decoding" }, +#define PT_VERB_SIMPLE 3 + { .name="simple", .desc="add request/response status line or htx info when available" }, +#define PT_VERB_ADVANCED 4 + { .name="advanced", .desc="add header fields or frame decoding when available" }, +#define PT_VERB_COMPLETE 5 + { .name="complete", .desc="add full data dump when available" }, + { /* end */ } +}; + +static struct trace_source trace_pt __read_mostly = { + .name = IST("pt"), + .desc = "Passthrough multiplexer", + .arg_def = TRC_ARG1_CONN, // TRACE()'s first argument is always a connection + .default_cb = pt_trace, + .known_events = pt_trace_events, + .lockon_args = NULL, + .decoding = pt_trace_decoding, + .report_events = ~0, // report everything by default +}; + +#define TRACE_SOURCE &trace_pt +INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE); + +/* returns the stconn associated to the stream */ +static forceinline struct stconn *pt_sc(const struct mux_pt_ctx *pt) +{ + return pt->sd->sc; +} + +static inline void pt_trace_buf(const struct buffer *buf, size_t ofs, size_t len) +{ + size_t block1, block2; + int line, ptr, newptr; + + block1 = b_contig_data(buf, ofs); + block2 = 0; + if (block1 > len) + block1 = len; + block2 = len - block1; + + ofs = b_peek_ofs(buf, ofs); + + line = 0; + ptr = ofs; + while (ptr < ofs + block1) { + newptr = dump_text_line(&trace_buf, b_orig(buf), b_size(buf), ofs + block1, &line, ptr); + if (newptr == ptr) + break; + ptr = newptr; + } + + line = ptr = 0; + while (ptr < block2) { + newptr = dump_text_line(&trace_buf, b_orig(buf), b_size(buf), block2, &line, ptr); + if (newptr == ptr) + break; + ptr = newptr; + } +} + +/* the PT traces always expect that arg1, if non-null, is of type connection + * (from which we can derive the pt context), that arg2, if non-null, is a + * stream connector, and that arg3, if non-null, is a buffer. + */ +static void pt_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 mux_pt_ctx *ctx = conn ? conn->ctx : NULL; + const struct stconn *sc = a2; + const struct buffer *buf = a3; + const size_t *val = a4; + + if (!ctx || src->verbosity < PT_VERB_CLEAN) + return; + + /* Display frontend/backend info by default */ + chunk_appendf(&trace_buf, " : [%c]", (conn_is_back(conn) ? 'B' : 'F')); + + if (src->verbosity == PT_VERB_CLEAN) + return; + + if (!sc) + sc = pt_sc(ctx); + + /* Display the value to the 4th argument (level > STATE) */ + if (src->level > TRACE_LEVEL_STATE && val) + chunk_appendf(&trace_buf, " - VAL=%lu", (long)*val); + + /* Display conn and sc info, if defined (pointer + flags) */ + chunk_appendf(&trace_buf, " - conn=%p(0x%08x)", conn, conn->flags); + chunk_appendf(&trace_buf, " sd=%p(0x%08x)", ctx->sd, se_fl_get(ctx->sd)); + if (sc) + chunk_appendf(&trace_buf, " sc=%p(0x%08x)", sc, sc->flags); + + if (src->verbosity == PT_VERB_MINIMAL) + return; + + /* Display buffer info, if defined (level > USER & verbosity > SIMPLE) */ + if (src->level > TRACE_LEVEL_USER && buf) { + int full = 0, max = 3000, chunk = 1024; + + /* Full info (level > STATE && verbosity > SIMPLE) */ + if (src->level > TRACE_LEVEL_STATE) { + if (src->verbosity == PT_VERB_COMPLETE) + full = 1; + else if (src->verbosity == PT_VERB_ADVANCED) { + full = 1; + max = 256; + chunk = 64; + } + } + + chunk_appendf(&trace_buf, " buf=%u@%p+%u/%u", + (unsigned int)b_data(buf), b_orig(buf), + (unsigned int)b_head_ofs(buf), (unsigned int)b_size(buf)); + + if (b_data(buf) && full) { + chunk_memcat(&trace_buf, "\n", 1); + if (b_data(buf) < max) + pt_trace_buf(buf, 0, b_data(buf)); + else { + pt_trace_buf(buf, 0, chunk); + chunk_memcat(&trace_buf, " ...\n", 6); + pt_trace_buf(buf, b_data(buf) - chunk, chunk); + } + } + } +} + +static void mux_pt_destroy(struct mux_pt_ctx *ctx) +{ + struct connection *conn = NULL; + + TRACE_POINT(PT_EV_CONN_END); + + /* The connection must be attached to this mux to be released */ + if (ctx->conn && ctx->conn->ctx == ctx) + conn = ctx->conn; + + tasklet_free(ctx->wait_event.tasklet); + + if (conn && ctx->wait_event.events != 0) + conn->xprt->unsubscribe(conn, conn->xprt_ctx, ctx->wait_event.events, + &ctx->wait_event); + BUG_ON(ctx->sd && !se_fl_test(ctx->sd, SE_FL_ORPHAN)); + sedesc_free(ctx->sd); + pool_free(pool_head_pt_ctx, ctx); + + if (conn) { + conn->mux = NULL; + conn->ctx = NULL; + TRACE_DEVEL("freeing conn", PT_EV_CONN_END, conn); + + conn_stop_tracking(conn); + conn_full_close(conn); + if (conn->destroy_cb) + conn->destroy_cb(conn); + conn_free(conn); + } +} + +/* Callback, used when we get I/Os while in idle mode. This one is exported so + * that "show fd" can resolve it. + */ +struct task *mux_pt_io_cb(struct task *t, void *tctx, unsigned int status) +{ + struct mux_pt_ctx *ctx = tctx; + + TRACE_ENTER(PT_EV_CONN_WAKE, ctx->conn); + if (!se_fl_test(ctx->sd, SE_FL_ORPHAN)) { + /* There's a small race condition. + * mux_pt_io_cb() is only supposed to be called if we have no + * stream attached. However, maybe the tasklet got woken up, + * and this connection was then attached to a new stream. + * If this happened, just wake the tasklet up if anybody + * subscribed to receive events, and otherwise call the wake + * method, to make sure the event is noticed. + */ + if (ctx->conn->subs) { + ctx->conn->subs->events = 0; + tasklet_wakeup(ctx->conn->subs->tasklet); + ctx->conn->subs = NULL; + } else if (pt_sc(ctx)->app_ops->wake) + pt_sc(ctx)->app_ops->wake(pt_sc(ctx)); + TRACE_DEVEL("leaving waking up SC", PT_EV_CONN_WAKE, ctx->conn); + return t; + } + conn_ctrl_drain(ctx->conn); + if (ctx->conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH)) { + TRACE_DEVEL("leaving destroying pt context", PT_EV_CONN_WAKE, ctx->conn); + mux_pt_destroy(ctx); + t = NULL; + } + else { + ctx->conn->xprt->subscribe(ctx->conn, ctx->conn->xprt_ctx, SUB_RETRY_RECV, + &ctx->wait_event); + TRACE_DEVEL("leaving subscribing for reads", PT_EV_CONN_WAKE, ctx->conn); + } + + return t; +} + +/* Initialize the mux once it's attached. It is expected that conn->ctx points + * to the existing stream connector (for outgoing connections) or NULL (for + * incoming ones, in which case one will be allocated and a new stream will be + * instantiated). Returns < 0 on error. + */ +static int mux_pt_init(struct connection *conn, struct proxy *prx, struct session *sess, + struct buffer *input) +{ + struct stconn *sc = conn->ctx; + struct mux_pt_ctx *ctx = pool_alloc(pool_head_pt_ctx); + + TRACE_ENTER(PT_EV_CONN_NEW); + + if (!ctx) { + TRACE_ERROR("PT context allocation failure", PT_EV_CONN_NEW|PT_EV_CONN_END|PT_EV_CONN_ERR); + goto fail; + } + + ctx->wait_event.tasklet = tasklet_new(); + if (!ctx->wait_event.tasklet) + goto fail_free_ctx; + ctx->wait_event.tasklet->context = ctx; + ctx->wait_event.tasklet->process = mux_pt_io_cb; + ctx->wait_event.events = 0; + ctx->conn = conn; + + if (!sc) { + ctx->sd = sedesc_new(); + if (!ctx->sd) { + TRACE_ERROR("SC allocation failure", PT_EV_STRM_NEW|PT_EV_STRM_END|PT_EV_STRM_ERR, conn); + goto fail_free_ctx; + } + ctx->sd->se = ctx; + ctx->sd->conn = conn; + se_fl_set(ctx->sd, SE_FL_T_MUX | SE_FL_ORPHAN); + + sc = sc_new_from_endp(ctx->sd, sess, input); + if (!sc) { + TRACE_ERROR("SC allocation failure", PT_EV_STRM_NEW|PT_EV_STRM_END|PT_EV_STRM_ERR, conn); + goto fail_free_sd; + } + TRACE_POINT(PT_EV_STRM_NEW, conn, sc); + } + else { + if (sc_attach_mux(sc, ctx, conn) < 0) + goto fail_free_ctx; + ctx->sd = sc->sedesc; + } + conn->ctx = ctx; + se_fl_set(ctx->sd, SE_FL_RCV_MORE); + if ((global.tune.options & GTUNE_USE_SPLICE) && !(global.tune.no_zero_copy_fwd & NO_ZERO_COPY_FWD_PT)) + se_fl_set(ctx->sd, SE_FL_MAY_FASTFWD_PROD|SE_FL_MAY_FASTFWD_CONS); + + TRACE_LEAVE(PT_EV_CONN_NEW, conn); + return 0; + + fail_free_sd: + sedesc_free(ctx->sd); + fail_free_ctx: + tasklet_free(ctx->wait_event.tasklet); + pool_free(pool_head_pt_ctx, ctx); + fail: + TRACE_DEVEL("leaving in error", PT_EV_CONN_NEW|PT_EV_CONN_END|PT_EV_CONN_ERR); + return -1; +} + +/* callback to be used by default for the pass-through mux. It calls the data + * layer wake() callback if it is set otherwise returns 0. + */ +static int mux_pt_wake(struct connection *conn) +{ + struct mux_pt_ctx *ctx = conn->ctx; + int ret = 0; + + TRACE_ENTER(PT_EV_CONN_WAKE, ctx->conn); + if (!se_fl_test(ctx->sd, SE_FL_ORPHAN)) { + ret = pt_sc(ctx)->app_ops->wake ? pt_sc(ctx)->app_ops->wake(pt_sc(ctx)) : 0; + + if (ret < 0) { + TRACE_DEVEL("leaving waking up SC", PT_EV_CONN_WAKE, ctx->conn); + return ret; + } + } else { + conn_ctrl_drain(conn); + if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH)) { + TRACE_DEVEL("leaving destroying PT context", PT_EV_CONN_WAKE, ctx->conn); + mux_pt_destroy(ctx); + return -1; + } + } + + /* If we had early data, and we're done with the handshake + * then we know the data are safe, and we can remove the flag. + */ + if ((conn->flags & (CO_FL_EARLY_DATA | CO_FL_EARLY_SSL_HS | CO_FL_WAIT_XPRT)) == + CO_FL_EARLY_DATA) + conn->flags &= ~CO_FL_EARLY_DATA; + + TRACE_LEAVE(PT_EV_CONN_WAKE, ctx->conn); + return ret; +} + +/* + * Attach a new stream to a connection + * (Used for outgoing connections) + */ +static int mux_pt_attach(struct connection *conn, struct sedesc *sd, struct session *sess) +{ + struct mux_pt_ctx *ctx = conn->ctx; + + TRACE_ENTER(PT_EV_STRM_NEW, conn); + if (ctx->wait_event.events) + conn->xprt->unsubscribe(ctx->conn, conn->xprt_ctx, SUB_RETRY_RECV, &ctx->wait_event); + if (sc_attach_mux(sd->sc, ctx, conn) < 0) + return -1; + ctx->sd = sd; + se_fl_set(ctx->sd, SE_FL_RCV_MORE); + if ((global.tune.options & GTUNE_USE_SPLICE) && !(global.tune.no_zero_copy_fwd & NO_ZERO_COPY_FWD_PT)) + se_fl_set(ctx->sd, SE_FL_MAY_FASTFWD_PROD|SE_FL_MAY_FASTFWD_CONS); + + TRACE_LEAVE(PT_EV_STRM_NEW, conn, sd->sc); + return 0; +} + +/* Retrieves a valid stream connector from this connection, or returns NULL. + * For this mux, it's easy as we can only store a single stream connector. + */ +static struct stconn *mux_pt_get_first_sc(const struct connection *conn) +{ + struct mux_pt_ctx *ctx = conn->ctx; + + return pt_sc(ctx); +} + +/* Destroy the mux and the associated connection if still attached to this mux + * and no longer used */ +static void mux_pt_destroy_meth(void *ctx) +{ + struct mux_pt_ctx *pt = ctx; + + TRACE_POINT(PT_EV_CONN_END, pt->conn, pt_sc(pt)); + if (se_fl_test(pt->sd, SE_FL_ORPHAN) || pt->conn->ctx != pt) { + if (pt->conn->ctx != pt) { + pt->sd = NULL; + } + mux_pt_destroy(pt); + } +} + +/* + * Detach the stream from the connection and possibly release the connection. + */ +static void mux_pt_detach(struct sedesc *sd) +{ + struct connection *conn = sd->conn; + struct mux_pt_ctx *ctx; + + TRACE_ENTER(PT_EV_STRM_END, conn, sd->sc); + + ctx = conn->ctx; + + /* Subscribe, to know if we got disconnected */ + if (!conn_is_back(conn) && conn->owner != NULL && + !(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) { + conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &ctx->wait_event); + } else { + /* There's no session attached to that connection, destroy it */ + TRACE_DEVEL("killing dead connection", PT_EV_STRM_END, conn, sd->sc); + mux_pt_destroy(ctx); + } + + TRACE_LEAVE(PT_EV_STRM_END); +} + +/* returns the number of streams in use on a connection */ +static int mux_pt_used_streams(struct connection *conn) +{ + struct mux_pt_ctx *ctx = conn->ctx; + + return (!se_fl_test(ctx->sd, SE_FL_ORPHAN) ? 1 : 0); +} + +/* returns the number of streams still available on a connection */ +static int mux_pt_avail_streams(struct connection *conn) +{ + return 1 - mux_pt_used_streams(conn); +} + +static void mux_pt_shutr(struct stconn *sc, enum co_shr_mode mode) +{ + struct connection *conn = __sc_conn(sc); + struct mux_pt_ctx *ctx = conn->ctx; + + TRACE_ENTER(PT_EV_STRM_SHUT, conn, sc); + + se_fl_clr(ctx->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + if (conn_xprt_ready(conn) && conn->xprt->shutr) + conn->xprt->shutr(conn, conn->xprt_ctx, + (mode == CO_SHR_DRAIN)); + else if (mode == CO_SHR_DRAIN) + conn_ctrl_drain(conn); + if (se_fl_test(ctx->sd, SE_FL_SHW)) + conn_full_close(conn); + + TRACE_LEAVE(PT_EV_STRM_SHUT, conn, sc); +} + +static void mux_pt_shutw(struct stconn *sc, enum co_shw_mode mode) +{ + struct connection *conn = __sc_conn(sc); + struct mux_pt_ctx *ctx = conn->ctx; + + TRACE_ENTER(PT_EV_STRM_SHUT, conn, sc); + + if (conn_xprt_ready(conn) && conn->xprt->shutw) + conn->xprt->shutw(conn, conn->xprt_ctx, + (mode == CO_SHW_NORMAL)); + if (!se_fl_test(ctx->sd, SE_FL_SHR)) + conn_sock_shutw(conn, (mode == CO_SHW_NORMAL)); + else + conn_full_close(conn); + + TRACE_LEAVE(PT_EV_STRM_SHUT, conn, sc); +} + +/* + * Called from the upper layer, to get more 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 mux_pt_rcv_buf(struct stconn *sc, struct buffer *buf, size_t count, int flags) +{ + struct connection *conn = __sc_conn(sc); + struct mux_pt_ctx *ctx = conn->ctx; + size_t ret = 0; + + TRACE_ENTER(PT_EV_RX_DATA, conn, sc, buf, (size_t[]){count}); + + if (!count) { + se_fl_set(ctx->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + goto end; + } + b_realign_if_empty(buf); + ret = conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, count, flags); + if (conn->flags & CO_FL_ERROR) { + se_fl_clr(ctx->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + if (conn_xprt_read0_pending(conn)) + se_fl_set(ctx->sd, SE_FL_EOS); + se_fl_set(ctx->sd, SE_FL_ERROR); + TRACE_DEVEL("error on connection", PT_EV_RX_DATA|PT_EV_CONN_ERR, conn, sc); + } + else if (conn_xprt_read0_pending(conn)) { + se_fl_clr(ctx->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + se_fl_set(ctx->sd, (SE_FL_EOI|SE_FL_EOS)); + TRACE_DEVEL("read0 on connection", PT_EV_RX_DATA, conn, sc); + } + end: + TRACE_LEAVE(PT_EV_RX_DATA, conn, sc, buf, (size_t[]){ret}); + return ret; +} + +/* Called from the upper layer, to send data */ +static size_t mux_pt_snd_buf(struct stconn *sc, struct buffer *buf, size_t count, int flags) +{ + struct connection *conn = __sc_conn(sc); + struct mux_pt_ctx *ctx = conn->ctx; + size_t ret; + + TRACE_ENTER(PT_EV_TX_DATA, conn, sc, buf, (size_t[]){count}); + + ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, count, flags); + + if (ret > 0) + b_del(buf, ret); + + if (conn->flags & CO_FL_ERROR) { + if (conn_xprt_read0_pending(conn)) + se_fl_set(ctx->sd, SE_FL_EOS); + se_fl_set_error(ctx->sd); + TRACE_DEVEL("error on connection", PT_EV_TX_DATA|PT_EV_CONN_ERR, conn, sc); + } + + TRACE_LEAVE(PT_EV_TX_DATA, conn, sc, buf, (size_t[]){ret}); + return ret; +} + +static inline struct sedesc *mux_pt_opposite_sd(struct mux_pt_ctx *ctx) +{ + struct xref *peer; + struct sedesc *sdo; + + peer = xref_get_peer_and_lock(&ctx->sd->xref); + if (!peer) + return NULL; + + sdo = container_of(peer, struct sedesc, xref); + xref_unlock(&ctx->sd->xref, peer); + return sdo; +} + +static size_t mux_pt_nego_ff(struct stconn *sc, struct buffer *input, size_t count, unsigned int may_splice) +{ + struct connection *conn = __sc_conn(sc); + struct mux_pt_ctx *ctx = conn->ctx; + size_t ret = 0; + + TRACE_ENTER(PT_EV_TX_DATA, conn, sc, 0, (size_t[]){count}); + + /* Use kernel splicing if it is supported by the sender and if there + * are no input data _AND_ no output data. + * + * TODO: It may be good to add a flag to send obuf data first if any, + * and then data in pipe, or the opposite. For now, it is not + * supported to mix data. + */ + if (!b_data(input) && may_splice) { + if (conn->xprt->snd_pipe && (ctx->sd->iobuf.pipe || (pipes_used < global.maxpipes && (ctx->sd->iobuf.pipe = get_pipe())))) { + ctx->sd->iobuf.offset = 0; + ctx->sd->iobuf.data = 0; + ret = count; + goto out; + } + ctx->sd->iobuf.flags |= IOBUF_FL_NO_SPLICING; + TRACE_DEVEL("Unable to allocate pipe for splicing, fallback to buffer", PT_EV_TX_DATA, conn, sc); + } + + /* No buffer case */ + + out: + TRACE_LEAVE(PT_EV_TX_DATA, conn, sc, 0, (size_t[]){ret}); + return ret; +} + +static size_t mux_pt_done_ff(struct stconn *sc) +{ + struct connection *conn = __sc_conn(sc); + struct mux_pt_ctx *ctx = conn->ctx; + struct sedesc *sd = ctx->sd; + size_t total = 0; + + TRACE_ENTER(PT_EV_TX_DATA, conn, sc); + + if (sd->iobuf.pipe) { + total = conn->xprt->snd_pipe(conn, conn->xprt_ctx, sd->iobuf.pipe, sd->iobuf.pipe->data); + if (!sd->iobuf.pipe->data) { + put_pipe(sd->iobuf.pipe); + sd->iobuf.pipe = NULL; + } + } + else { + BUG_ON(sd->iobuf.buf); + } + + out: + if (conn->flags & CO_FL_ERROR) { + if (conn_xprt_read0_pending(conn)) + se_fl_set(ctx->sd, SE_FL_EOS); + se_fl_set_error(ctx->sd); + TRACE_DEVEL("error on connection", PT_EV_TX_DATA|PT_EV_CONN_ERR, conn, sc); + } + + TRACE_LEAVE(PT_EV_TX_DATA, conn, sc, 0, (size_t[]){total}); + return total; +} + +static int mux_pt_fastfwd(struct stconn *sc, unsigned int count, unsigned int flags) +{ + struct connection *conn = __sc_conn(sc); + struct mux_pt_ctx *ctx = conn->ctx; + struct sedesc *sdo = NULL; + size_t total = 0, try = 0; + int ret = 0; + + TRACE_ENTER(PT_EV_RX_DATA, conn, sc, 0, (size_t[]){count}); + + se_fl_clr(ctx->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + conn->flags &= ~CO_FL_WAIT_ROOM; + sdo = mux_pt_opposite_sd(ctx); + if (!sdo) { + TRACE_STATE("Opposite endpoint not available yet", PT_EV_RX_DATA, conn, sc); + goto out; + } + + try = se_nego_ff(sdo, &BUF_NULL, count, conn->xprt->rcv_pipe && !!(flags & CO_RFL_MAY_SPLICE) && !(sdo->iobuf.flags & IOBUF_FL_NO_SPLICING)); + if (sdo->iobuf.flags & IOBUF_FL_NO_FF) { + /* Fast forwarding is not supported by the consumer */ + se_fl_clr(ctx->sd, SE_FL_MAY_FASTFWD_PROD); + TRACE_DEVEL("Fast-forwarding not supported by opposite endpoint, disable it", PT_EV_RX_DATA, conn, sc); + goto end; + } + if (sdo->iobuf.flags & IOBUF_FL_FF_BLOCKED) { + se_fl_set(ctx->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + TRACE_STATE("waiting for more room", PT_EV_RX_DATA|PT_EV_STRM_ERR, conn, sc); + goto out; + } + + total += sdo->iobuf.data; + + if (sdo->iobuf.pipe) { + /* Here, not data was xferred */ + ret = conn->xprt->rcv_pipe(conn, conn->xprt_ctx, sdo->iobuf.pipe, try); + if (ret < 0) { + TRACE_ERROR("Error when trying to fast-forward data, disable it and abort", + PT_EV_RX_DATA|PT_EV_STRM_ERR|PT_EV_CONN_ERR, conn, sc); + se_fl_clr(ctx->sd, SE_FL_MAY_FASTFWD_PROD); + BUG_ON(sdo->iobuf.pipe->data); + put_pipe(sdo->iobuf.pipe); + sdo->iobuf.pipe = NULL; + goto end; + } + total += ret; + } + else { + BUG_ON(sdo->iobuf.buf); + ret = -1; /* abort splicing for now and fallback to buffer mode */ + goto end; + } + + ret = total; + se_done_ff(sdo); + + if (sdo->iobuf.pipe) { + se_fl_set(ctx->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM); + } + + TRACE_DEVEL("Data fast-forwarded", PT_EV_RX_DATA, conn, sc, 0, (size_t[]){ret}); + + + out: + if (conn->flags & CO_FL_ERROR) { + if (conn_xprt_read0_pending(conn)) + se_fl_set(ctx->sd, SE_FL_EOS); + se_fl_set(ctx->sd, SE_FL_ERROR); + TRACE_DEVEL("error on connection", PT_EV_RX_DATA|PT_EV_CONN_ERR, conn, sc); + } + else if (conn_xprt_read0_pending(conn)) { + se_fl_set(ctx->sd, (SE_FL_EOS|SE_FL_EOI)); + TRACE_DEVEL("read0 on connection", PT_EV_RX_DATA, conn, sc); + } + end: + TRACE_LEAVE(PT_EV_RX_DATA, conn, sc, 0, (size_t[]){ret}); + return ret; +} + +static int mux_pt_resume_fastfwd(struct stconn *sc, unsigned int flags) +{ + struct connection *conn = __sc_conn(sc); + struct mux_pt_ctx *ctx = conn->ctx; + struct sedesc *sd = ctx->sd; + size_t total = 0; + + TRACE_ENTER(PT_EV_TX_DATA, conn, sc, 0, (size_t[]){flags}); + + if (sd->iobuf.pipe) { + total = conn->xprt->snd_pipe(conn, conn->xprt_ctx, sd->iobuf.pipe, sd->iobuf.pipe->data); + if (!sd->iobuf.pipe->data) { + put_pipe(sd->iobuf.pipe); + sd->iobuf.pipe = NULL; + } + } + else { + BUG_ON(sd->iobuf.buf); + } + + out: + if (conn->flags & CO_FL_ERROR) { + if (conn_xprt_read0_pending(conn)) + se_fl_set(ctx->sd, SE_FL_EOS); + se_fl_set_error(ctx->sd); + TRACE_DEVEL("error on connection", PT_EV_TX_DATA|PT_EV_CONN_ERR, conn, sc); + } + + TRACE_LEAVE(PT_EV_TX_DATA, conn, sc, 0, (size_t[]){total}); + return total; +} + +/* 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 mux_pt_subscribe(struct stconn *sc, int event_type, struct wait_event *es) +{ + struct connection *conn = __sc_conn(sc); + + TRACE_POINT(PT_EV_RX_DATA|PT_EV_TX_DATA, conn, sc, 0, (size_t[]){event_type}); + return conn->xprt->subscribe(conn, conn->xprt_ctx, event_type, es); +} + +/* 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 mux_pt_unsubscribe(struct stconn *sc, int event_type, struct wait_event *es) +{ + struct connection *conn = __sc_conn(sc); + + TRACE_POINT(PT_EV_RX_DATA|PT_EV_TX_DATA, conn, sc, 0, (size_t[]){event_type}); + return conn->xprt->unsubscribe(conn, conn->xprt_ctx, event_type, es); +} + +static int mux_pt_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output) +{ + int ret = 0; + switch (mux_ctl) { + case MUX_CTL_STATUS: + if (!(conn->flags & CO_FL_WAIT_XPRT)) + ret |= MUX_STATUS_READY; + return ret; + case MUX_CTL_EXIT_STATUS: + return MUX_ES_UNKNOWN; + default: + return -1; + } +} + +static int mux_pt_sctl(struct stconn *sc, enum mux_sctl_type mux_sctl, void *output) +{ + int ret = 0; + + switch (mux_sctl) { + case MUX_SCTL_SID: + if (output) + *((int64_t *)output) = 0; + return ret; + + default: + return -1; + } +} + +/* config parser for global "tune.pt.zero-copy-forwarding" */ +static int cfg_parse_pt_zero_copy_fwd(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_PT; + else if (strcmp(args[1], "off") == 0) + global.tune.no_zero_copy_fwd |= NO_ZERO_COPY_FWD_PT; + else { + memprintf(err, "'%s' expects 'on' or 'off'.", args[0]); + return -1; + } + return 0; +} + + +/* config keyword parsers */ +static struct cfg_kw_list cfg_kws = {ILH, { + { CFG_GLOBAL, "tune.pt.zero-copy-forwarding", cfg_parse_pt_zero_copy_fwd }, + { 0, NULL, NULL } +}}; + +INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws); + + +/* The mux operations */ +const struct mux_ops mux_tcp_ops = { + .init = mux_pt_init, + .wake = mux_pt_wake, + .rcv_buf = mux_pt_rcv_buf, + .snd_buf = mux_pt_snd_buf, + .nego_fastfwd = mux_pt_nego_ff, + .done_fastfwd = mux_pt_done_ff, + .fastfwd = mux_pt_fastfwd, + .resume_fastfwd = mux_pt_resume_fastfwd, + .subscribe = mux_pt_subscribe, + .unsubscribe = mux_pt_unsubscribe, + .attach = mux_pt_attach, + .get_first_sc = mux_pt_get_first_sc, + .detach = mux_pt_detach, + .avail_streams = mux_pt_avail_streams, + .used_streams = mux_pt_used_streams, + .destroy = mux_pt_destroy_meth, + .ctl = mux_pt_ctl, + .sctl = mux_pt_sctl, + .shutr = mux_pt_shutr, + .shutw = mux_pt_shutw, + .flags = MX_FL_NONE, + .name = "PASS", +}; + + +const struct mux_ops mux_pt_ops = { + .init = mux_pt_init, + .wake = mux_pt_wake, + .rcv_buf = mux_pt_rcv_buf, + .snd_buf = mux_pt_snd_buf, + .nego_fastfwd = mux_pt_nego_ff, + .done_fastfwd = mux_pt_done_ff, + .fastfwd = mux_pt_fastfwd, + .resume_fastfwd = mux_pt_resume_fastfwd, + .subscribe = mux_pt_subscribe, + .unsubscribe = mux_pt_unsubscribe, + .attach = mux_pt_attach, + .get_first_sc = mux_pt_get_first_sc, + .detach = mux_pt_detach, + .avail_streams = mux_pt_avail_streams, + .used_streams = mux_pt_used_streams, + .destroy = mux_pt_destroy_meth, + .ctl = mux_pt_ctl, + .sctl = mux_pt_sctl, + .shutr = mux_pt_shutr, + .shutw = mux_pt_shutw, + .flags = MX_FL_NONE|MX_FL_NO_UPG, + .name = "PASS", +}; + +/* PROT selection : default mux has empty name */ +static struct mux_proto_list mux_proto_none = + { .token = IST("none"), .mode = PROTO_MODE_TCP, .side = PROTO_SIDE_BOTH, .mux = &mux_pt_ops }; +static struct mux_proto_list mux_proto_tcp = + { .token = IST(""), .mode = PROTO_MODE_TCP, .side = PROTO_SIDE_BOTH, .mux = &mux_tcp_ops }; + +INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_none); +INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_tcp); |