| /* |
| * Functions managing stream_interface structures |
| * |
| * Copyright 2000-2012 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 <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include <common/buffer.h> |
| #include <common/compat.h> |
| #include <common/config.h> |
| #include <common/debug.h> |
| #include <common/standard.h> |
| #include <common/ticks.h> |
| #include <common/time.h> |
| |
| #include <proto/applet.h> |
| #include <proto/channel.h> |
| #include <proto/connection.h> |
| #include <proto/http_htx.h> |
| #include <proto/mux_pt.h> |
| #include <proto/pipe.h> |
| #include <proto/proxy.h> |
| #include <proto/stream.h> |
| #include <proto/stream_interface.h> |
| #include <proto/task.h> |
| |
| #include <types/pipe.h> |
| |
| /* functions used by default on a detached stream-interface */ |
| static void stream_int_shutr(struct stream_interface *si); |
| static void stream_int_shutw(struct stream_interface *si); |
| static void stream_int_chk_rcv(struct stream_interface *si); |
| static void stream_int_chk_snd(struct stream_interface *si); |
| |
| /* functions used on a conn_stream-based stream-interface */ |
| static void stream_int_shutr_conn(struct stream_interface *si); |
| static void stream_int_shutw_conn(struct stream_interface *si); |
| static void stream_int_chk_rcv_conn(struct stream_interface *si); |
| static void stream_int_chk_snd_conn(struct stream_interface *si); |
| |
| /* functions used on an applet-based stream-interface */ |
| static void stream_int_shutr_applet(struct stream_interface *si); |
| static void stream_int_shutw_applet(struct stream_interface *si); |
| static void stream_int_chk_rcv_applet(struct stream_interface *si); |
| static void stream_int_chk_snd_applet(struct stream_interface *si); |
| |
| /* last read notification */ |
| static void stream_int_read0(struct stream_interface *si); |
| |
| /* post-IO notification callback */ |
| static void stream_int_notify(struct stream_interface *si); |
| |
| /* stream-interface operations for embedded tasks */ |
| struct si_ops si_embedded_ops = { |
| .chk_rcv = stream_int_chk_rcv, |
| .chk_snd = stream_int_chk_snd, |
| .shutr = stream_int_shutr, |
| .shutw = stream_int_shutw, |
| }; |
| |
| /* stream-interface operations for connections */ |
| struct si_ops si_conn_ops = { |
| .chk_rcv = stream_int_chk_rcv_conn, |
| .chk_snd = stream_int_chk_snd_conn, |
| .shutr = stream_int_shutr_conn, |
| .shutw = stream_int_shutw_conn, |
| }; |
| |
| /* stream-interface operations for connections */ |
| struct si_ops si_applet_ops = { |
| .chk_rcv = stream_int_chk_rcv_applet, |
| .chk_snd = stream_int_chk_snd_applet, |
| .shutr = stream_int_shutr_applet, |
| .shutw = stream_int_shutw_applet, |
| }; |
| |
| |
| /* Functions used to communicate with a conn_stream. The first two may be used |
| * directly, the last one is mostly a wake callback. |
| */ |
| int si_cs_recv(struct conn_stream *cs); |
| int si_cs_send(struct conn_stream *cs); |
| static int si_cs_process(struct conn_stream *cs); |
| |
| |
| struct data_cb si_conn_cb = { |
| .wake = si_cs_process, |
| .name = "STRM", |
| }; |
| |
| /* |
| * This function only has to be called once after a wakeup event in case of |
| * suspected timeout. It controls the stream interface timeouts and sets |
| * si->flags accordingly. It does NOT close anything, as this timeout may |
| * be used for any purpose. It returns 1 if the timeout fired, otherwise |
| * zero. |
| */ |
| int si_check_timeouts(struct stream_interface *si) |
| { |
| if (tick_is_expired(si->exp, now_ms)) { |
| si->flags |= SI_FL_EXP; |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* to be called only when in SI_ST_DIS with SI_FL_ERR */ |
| void si_report_error(struct stream_interface *si) |
| { |
| if (!si->err_type) |
| si->err_type = SI_ET_DATA_ERR; |
| |
| si_oc(si)->flags |= CF_WRITE_ERROR; |
| si_ic(si)->flags |= CF_READ_ERROR; |
| } |
| |
| /* |
| * Returns a message to the client ; the connection is shut down for read, |
| * and the request is cleared so that no server connection can be initiated. |
| * The buffer is marked for read shutdown on the other side to protect the |
| * message, and the buffer write is enabled. The message is contained in a |
| * "chunk". If it is null, then an empty message is used. The reply buffer does |
| * not need to be empty before this, and its contents will not be overwritten. |
| * The primary goal of this function is to return error messages to a client. |
| */ |
| void si_retnclose(struct stream_interface *si, |
| const struct buffer *msg) |
| { |
| struct channel *ic = si_ic(si); |
| struct channel *oc = si_oc(si); |
| |
| channel_auto_read(ic); |
| channel_abort(ic); |
| channel_auto_close(ic); |
| channel_erase(ic); |
| channel_truncate(oc); |
| |
| if (likely(msg && msg->data)) |
| co_inject(oc, msg->area, msg->data); |
| |
| oc->wex = tick_add_ifset(now_ms, oc->wto); |
| channel_auto_read(oc); |
| channel_auto_close(oc); |
| channel_shutr_now(oc); |
| } |
| |
| /* |
| * This function performs a shutdown-read on a detached stream interface in a |
| * connected or init state (it does nothing for other states). It either shuts |
| * the read side or marks itself as closed. The buffer flags are updated to |
| * reflect the new state. If the stream interface has SI_FL_NOHALF, we also |
| * forward the close to the write side. The owner task is woken up if it exists. |
| */ |
| static void stream_int_shutr(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| |
| si_rx_shut_blk(si); |
| if (ic->flags & CF_SHUTR) |
| return; |
| ic->flags |= CF_SHUTR; |
| ic->rex = TICK_ETERNITY; |
| |
| if (!si_state_in(si->state, SI_SB_CON|SI_SB_RDY|SI_SB_EST)) |
| return; |
| |
| if (si_oc(si)->flags & CF_SHUTW) { |
| si->state = SI_ST_DIS; |
| si->exp = TICK_ETERNITY; |
| } |
| else if (si->flags & SI_FL_NOHALF) { |
| /* we want to immediately forward this close to the write side */ |
| return stream_int_shutw(si); |
| } |
| |
| /* note that if the task exists, it must unregister itself once it runs */ |
| if (!(si->flags & SI_FL_DONT_WAKE)) |
| task_wakeup(si_task(si), TASK_WOKEN_IO); |
| } |
| |
| /* |
| * This function performs a shutdown-write on a detached stream interface in a |
| * connected or init state (it does nothing for other states). It either shuts |
| * the write side or marks itself as closed. The buffer flags are updated to |
| * reflect the new state. It does also close everything if the SI was marked as |
| * being in error state. The owner task is woken up if it exists. |
| */ |
| static void stream_int_shutw(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| struct channel *oc = si_oc(si); |
| |
| oc->flags &= ~CF_SHUTW_NOW; |
| if (oc->flags & CF_SHUTW) |
| return; |
| oc->flags |= CF_SHUTW; |
| oc->wex = TICK_ETERNITY; |
| si_done_get(si); |
| |
| if (tick_isset(si->hcto)) { |
| ic->rto = si->hcto; |
| ic->rex = tick_add(now_ms, ic->rto); |
| } |
| |
| switch (si->state) { |
| case SI_ST_RDY: |
| case SI_ST_EST: |
| /* we have to shut before closing, otherwise some short messages |
| * may never leave the system, especially when there are remaining |
| * unread data in the socket input buffer, or when nolinger is set. |
| * However, if SI_FL_NOLINGER is explicitly set, we know there is |
| * no risk so we close both sides immediately. |
| */ |
| if (!(si->flags & (SI_FL_ERR | SI_FL_NOLINGER)) && |
| !(ic->flags & (CF_SHUTR|CF_DONT_READ))) |
| return; |
| |
| /* fall through */ |
| case SI_ST_CON: |
| case SI_ST_CER: |
| case SI_ST_QUE: |
| case SI_ST_TAR: |
| /* Note that none of these states may happen with applets */ |
| si->state = SI_ST_DIS; |
| default: |
| si->flags &= ~SI_FL_NOLINGER; |
| si_rx_shut_blk(si); |
| ic->flags |= CF_SHUTR; |
| ic->rex = TICK_ETERNITY; |
| si->exp = TICK_ETERNITY; |
| } |
| |
| /* note that if the task exists, it must unregister itself once it runs */ |
| if (!(si->flags & SI_FL_DONT_WAKE)) |
| task_wakeup(si_task(si), TASK_WOKEN_IO); |
| } |
| |
| /* default chk_rcv function for scheduled tasks */ |
| static void stream_int_chk_rcv(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| |
| DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n", |
| __FUNCTION__, |
| si, si->state, ic->flags, si_oc(si)->flags); |
| |
| if (ic->pipe) { |
| /* stop reading */ |
| si_rx_room_blk(si); |
| } |
| else { |
| /* (re)start reading */ |
| tasklet_wakeup(si->wait_event.tasklet); |
| if (!(si->flags & SI_FL_DONT_WAKE)) |
| task_wakeup(si_task(si), TASK_WOKEN_IO); |
| } |
| } |
| |
| /* default chk_snd function for scheduled tasks */ |
| static void stream_int_chk_snd(struct stream_interface *si) |
| { |
| struct channel *oc = si_oc(si); |
| |
| DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n", |
| __FUNCTION__, |
| si, si->state, si_ic(si)->flags, oc->flags); |
| |
| if (unlikely(si->state != SI_ST_EST || (oc->flags & CF_SHUTW))) |
| return; |
| |
| if (!(si->flags & SI_FL_WAIT_DATA) || /* not waiting for data */ |
| channel_is_empty(oc)) /* called with nothing to send ! */ |
| return; |
| |
| /* Otherwise there are remaining data to be sent in the buffer, |
| * so we tell the handler. |
| */ |
| si->flags &= ~SI_FL_WAIT_DATA; |
| if (!tick_isset(oc->wex)) |
| oc->wex = tick_add_ifset(now_ms, oc->wto); |
| |
| if (!(si->flags & SI_FL_DONT_WAKE)) |
| task_wakeup(si_task(si), TASK_WOKEN_IO); |
| } |
| |
| /* Register an applet to handle a stream_interface as a new appctx. The SI will |
| * wake it up everytime it is solicited. The appctx must be deleted by the task |
| * handler using si_release_endpoint(), possibly from within the function itself. |
| * It also pre-initializes the applet's context and returns it (or NULL in case |
| * it could not be allocated). |
| */ |
| struct appctx *si_register_handler(struct stream_interface *si, struct applet *app) |
| { |
| struct appctx *appctx; |
| |
| DPRINTF(stderr, "registering handler %p for si %p (was %p)\n", app, si, si_task(si)); |
| |
| appctx = si_alloc_appctx(si, app); |
| if (!appctx) |
| return NULL; |
| |
| si_cant_get(si); |
| appctx_wakeup(appctx); |
| return si_appctx(si); |
| } |
| |
| /* This callback is used to send a valid PROXY protocol line to a socket being |
| * established. It returns 0 if it fails in a fatal way or needs to poll to go |
| * further, otherwise it returns non-zero and removes itself from the connection's |
| * flags (the bit is provided in <flag> by the caller). It is designed to be |
| * called by the connection handler and relies on it to commit polling changes. |
| * Note that it can emit a PROXY line by relying on the other end's address |
| * when the connection is attached to a stream interface, or by resolving the |
| * local address otherwise (also called a LOCAL line). |
| */ |
| int conn_si_send_proxy(struct connection *conn, unsigned int flag) |
| { |
| /* we might have been called just after an asynchronous shutw */ |
| if (conn->flags & CO_FL_SOCK_WR_SH) |
| goto out_error; |
| |
| if (!conn_ctrl_ready(conn)) |
| goto out_error; |
| |
| /* If we have a PROXY line to send, we'll use this to validate the |
| * connection, in which case the connection is validated only once |
| * we've sent the whole proxy line. Otherwise we use connect(). |
| */ |
| if (conn->send_proxy_ofs) { |
| const struct conn_stream *cs; |
| int ret; |
| |
| cs = cs_get_first(conn); |
| /* The target server expects a PROXY line to be sent first. |
| * If the send_proxy_ofs is negative, it corresponds to the |
| * offset to start sending from then end of the proxy string |
| * (which is recomputed every time since it's constant). If |
| * it is positive, it means we have to send from the start. |
| * We can only send a "normal" PROXY line when the connection |
| * is attached to a stream interface. Otherwise we can only |
| * send a LOCAL line (eg: for use with health checks). |
| */ |
| |
| if (cs && cs->data_cb == &si_conn_cb) { |
| struct stream_interface *si = cs->data; |
| struct conn_stream *remote_cs = objt_cs(si_opposite(si)->end); |
| ret = make_proxy_line(trash.area, trash.size, |
| objt_server(conn->target), |
| remote_cs ? remote_cs->conn : NULL); |
| /* We may not have a conn_stream yet, if we don't |
| * know which mux to use, because it will be decided |
| * during the SSL handshake. In this case, there should |
| * be a session associated to the connection in |
| * conn->owner, and we know it is the session that |
| * initiated that connection, so we can just use |
| * its origin, which should contain the client |
| * connection. |
| */ |
| } else if (!cs && conn->owner) { |
| struct session *sess = conn->owner; |
| |
| ret = make_proxy_line(trash.area, trash.size, |
| objt_server(conn->target), |
| objt_conn(sess->origin)); |
| } |
| else { |
| /* The target server expects a LOCAL line to be sent first. Retrieving |
| * local or remote addresses may fail until the connection is established. |
| */ |
| if (!conn_get_src(conn) || !conn_get_dst(conn)) |
| goto out_wait; |
| |
| ret = make_proxy_line(trash.area, trash.size, |
| objt_server(conn->target), conn); |
| } |
| |
| if (!ret) |
| goto out_error; |
| |
| if (conn->send_proxy_ofs > 0) |
| conn->send_proxy_ofs = -ret; /* first call */ |
| |
| /* we have to send trash from (ret+sp for -sp bytes). If the |
| * data layer has a pending write, we'll also set MSG_MORE. |
| */ |
| ret = conn_sock_send(conn, |
| trash.area + ret + conn->send_proxy_ofs, |
| -conn->send_proxy_ofs, |
| (conn->flags & CO_FL_XPRT_WR_ENA) ? MSG_MORE : 0); |
| |
| if (ret < 0) |
| goto out_error; |
| |
| conn->send_proxy_ofs += ret; /* becomes zero once complete */ |
| if (conn->send_proxy_ofs != 0) |
| goto out_wait; |
| |
| /* OK we've sent the whole line, we're connected */ |
| } |
| |
| /* The connection is ready now, simply return and let the connection |
| * handler notify upper layers if needed. |
| */ |
| conn->flags &= ~CO_FL_WAIT_L4_CONN; |
| conn->flags &= ~flag; |
| return 1; |
| |
| out_error: |
| /* Write error on the file descriptor */ |
| conn->flags |= CO_FL_ERROR; |
| return 0; |
| |
| out_wait: |
| return 0; |
| } |
| |
| |
| /* This function is the equivalent to si_update() except that it's |
| * designed to be called from outside the stream handlers, typically the lower |
| * layers (applets, connections) after I/O completion. After updating the stream |
| * interface and timeouts, it will try to forward what can be forwarded, then to |
| * wake the associated task up if an important event requires special handling. |
| * It may update SI_FL_WAIT_DATA and/or SI_FL_RXBLK_ROOM, that the callers are |
| * encouraged to watch to take appropriate action. |
| * It should not be called from within the stream itself, si_update() |
| * is designed for this. |
| */ |
| static void stream_int_notify(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| struct channel *oc = si_oc(si); |
| struct stream_interface *sio = si_opposite(si); |
| struct task *task = si_task(si); |
| |
| /* process consumer side */ |
| if (channel_is_empty(oc)) { |
| struct connection *conn = objt_cs(si->end) ? objt_cs(si->end)->conn : NULL; |
| |
| if (((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW) && |
| (si->state == SI_ST_EST) && (!conn || !(conn->flags & (CO_FL_HANDSHAKE | CO_FL_EARLY_SSL_HS)))) |
| si_shutw(si); |
| oc->wex = TICK_ETERNITY; |
| } |
| |
| /* indicate that we may be waiting for data from the output channel or |
| * we're about to close and can't expect more data if SHUTW_NOW is there. |
| */ |
| if (!(oc->flags & (CF_SHUTW|CF_SHUTW_NOW))) |
| si->flags |= SI_FL_WAIT_DATA; |
| else if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW) |
| si->flags &= ~SI_FL_WAIT_DATA; |
| |
| /* update OC timeouts and wake the other side up if it's waiting for room */ |
| if (oc->flags & CF_WRITE_ACTIVITY) { |
| if ((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL && |
| !channel_is_empty(oc)) |
| if (tick_isset(oc->wex)) |
| oc->wex = tick_add_ifset(now_ms, oc->wto); |
| |
| if (!(si->flags & SI_FL_INDEP_STR)) |
| if (tick_isset(ic->rex)) |
| ic->rex = tick_add_ifset(now_ms, ic->rto); |
| } |
| |
| if (oc->flags & CF_DONT_READ) |
| si_rx_chan_blk(sio); |
| else |
| si_rx_chan_rdy(sio); |
| |
| /* Notify the other side when we've injected data into the IC that |
| * needs to be forwarded. We can do fast-forwarding as soon as there |
| * are output data, but we avoid doing this if some of the data are |
| * not yet scheduled for being forwarded, because it is very likely |
| * that it will be done again immediately afterwards once the following |
| * data are parsed (eg: HTTP chunking). We only SI_FL_RXBLK_ROOM once |
| * we've emptied *some* of the output buffer, and not just when there |
| * is available room, because applets are often forced to stop before |
| * the buffer is full. We must not stop based on input data alone because |
| * an HTTP parser might need more data to complete the parsing. |
| */ |
| if (!channel_is_empty(ic) && |
| (sio->flags & SI_FL_WAIT_DATA) && |
| (!(ic->flags & CF_EXPECT_MORE) || c_full(ic) || ci_data(ic) == 0 || ic->pipe)) { |
| int new_len, last_len; |
| |
| last_len = co_data(ic); |
| if (ic->pipe) |
| last_len += ic->pipe->data; |
| |
| si_chk_snd(sio); |
| |
| new_len = co_data(ic); |
| if (ic->pipe) |
| new_len += ic->pipe->data; |
| |
| /* check if the consumer has freed some space either in the |
| * buffer or in the pipe. |
| */ |
| if (new_len < last_len) |
| si_rx_room_rdy(si); |
| } |
| |
| if (!(ic->flags & CF_DONT_READ)) |
| si_rx_chan_rdy(si); |
| |
| si_chk_rcv(si); |
| si_chk_rcv(sio); |
| |
| if (si_rx_blocked(si)) { |
| ic->rex = TICK_ETERNITY; |
| } |
| else if ((ic->flags & (CF_SHUTR|CF_READ_PARTIAL)) == CF_READ_PARTIAL) { |
| /* we must re-enable reading if si_chk_snd() has freed some space */ |
| if (!(ic->flags & CF_READ_NOEXP) && tick_isset(ic->rex)) |
| ic->rex = tick_add_ifset(now_ms, ic->rto); |
| } |
| |
| /* wake the task up only when needed */ |
| if (/* changes on the production side */ |
| (ic->flags & (CF_READ_NULL|CF_READ_ERROR)) || |
| !si_state_in(si->state, SI_SB_CON|SI_SB_RDY|SI_SB_EST) || |
| (si->flags & SI_FL_ERR) || |
| ((ic->flags & CF_READ_PARTIAL) && |
| ((ic->flags & CF_EOI) || !ic->to_forward || sio->state != SI_ST_EST)) || |
| |
| /* changes on the consumption side */ |
| (oc->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) || |
| ((oc->flags & CF_WRITE_ACTIVITY) && |
| ((oc->flags & CF_SHUTW) || |
| (((oc->flags & CF_WAKE_WRITE) || |
| !(oc->flags & (CF_AUTO_CLOSE|CF_SHUTW_NOW|CF_SHUTW))) && |
| (sio->state != SI_ST_EST || |
| (channel_is_empty(oc) && !oc->to_forward)))))) { |
| task_wakeup(task, TASK_WOKEN_IO); |
| } |
| else { |
| /* Update expiration date for the task and requeue it */ |
| task->expire = tick_first((tick_is_expired(task->expire, now_ms) ? 0 : task->expire), |
| tick_first(tick_first(ic->rex, ic->wex), |
| tick_first(oc->rex, oc->wex))); |
| |
| task->expire = tick_first(task->expire, ic->analyse_exp); |
| task->expire = tick_first(task->expire, oc->analyse_exp); |
| |
| if (si->exp) |
| task->expire = tick_first(task->expire, si->exp); |
| |
| if (sio->exp) |
| task->expire = tick_first(task->expire, sio->exp); |
| |
| task_queue(task); |
| } |
| if (ic->flags & CF_READ_ACTIVITY) |
| ic->flags &= ~CF_READ_DONTWAIT; |
| } |
| |
| |
| /* Called by I/O handlers after completion.. It propagates |
| * connection flags to the stream interface, updates the stream (which may or |
| * may not take this opportunity to try to forward data), then update the |
| * connection's polling based on the channels and stream interface's final |
| * states. The function always returns 0. |
| */ |
| static int si_cs_process(struct conn_stream *cs) |
| { |
| struct connection *conn = cs->conn; |
| struct stream_interface *si = cs->data; |
| struct channel *ic = si_ic(si); |
| struct channel *oc = si_oc(si); |
| |
| /* If we have data to send, try it now */ |
| if (!channel_is_empty(oc) && !(si->wait_event.events & SUB_RETRY_SEND)) |
| si_cs_send(cs); |
| |
| /* First step, report to the stream-int what was detected at the |
| * connection layer : errors and connection establishment. |
| * Only add SI_FL_ERR if we're connected, or we're attempting to |
| * connect, we may get there because we got woken up, but only run |
| * after process_stream() noticed there were an error, and decided |
| * to retry to connect, the connection may still have CO_FL_ERROR, |
| * and we don't want to add SI_FL_ERR back |
| * |
| * Note: This test is only required because si_cs_process is also the SI |
| * wake callback. Otherwise si_cs_recv()/si_cs_send() already take |
| * care of it. |
| */ |
| if (si->state >= SI_ST_CON && |
| (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)) |
| si->flags |= SI_FL_ERR; |
| |
| /* If we had early data, and the handshake ended, then |
| * we can remove the flag, and attempt to wake the task up, |
| * in the event there's an analyser waiting for the end of |
| * the handshake. |
| */ |
| if (!(conn->flags & (CO_FL_HANDSHAKE | CO_FL_EARLY_SSL_HS)) && |
| (cs->flags & CS_FL_WAIT_FOR_HS)) { |
| cs->flags &= ~CS_FL_WAIT_FOR_HS; |
| task_wakeup(si_task(si), TASK_WOKEN_MSG); |
| } |
| |
| if (!si_state_in(si->state, SI_SB_EST|SI_SB_DIS|SI_SB_CLO) && |
| (conn->flags & (CO_FL_WAIT_L4L6 | CO_FL_HANDSHAKE)) == 0) { |
| si->exp = TICK_ETERNITY; |
| oc->flags |= CF_WRITE_NULL; |
| if (si->state == SI_ST_CON) |
| si->state = SI_ST_RDY; |
| } |
| |
| /* Report EOI on the channel if it was reached from the mux point of |
| * view. |
| * |
| * Note: This test is only required because si_cs_process is also the SI |
| * wake callback. Otherwise si_cs_recv()/si_cs_send() already take |
| * care of it. |
| */ |
| if ((cs->flags & CS_FL_EOI) && !(ic->flags & CF_EOI)) |
| ic->flags |= (CF_EOI|CF_READ_PARTIAL); |
| |
| /* Second step : update the stream-int and channels, try to forward any |
| * pending data, then possibly wake the stream up based on the new |
| * stream-int status. |
| */ |
| stream_int_notify(si); |
| stream_release_buffers(si_strm(si)); |
| return 0; |
| } |
| |
| /* |
| * This function is called to send buffer data to a stream socket. |
| * It calls the mux layer's snd_buf function. It relies on the |
| * caller to commit polling changes. The caller should check conn->flags |
| * for errors. |
| */ |
| int si_cs_send(struct conn_stream *cs) |
| { |
| struct connection *conn = cs->conn; |
| struct stream_interface *si = cs->data; |
| struct channel *oc = si_oc(si); |
| int ret; |
| int did_send = 0; |
| |
| if (conn->flags & CO_FL_ERROR || cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING)) { |
| /* We're probably there because the tasklet was woken up, |
| * but process_stream() ran before, detected there were an |
| * error and put the si back to SI_ST_TAR. There's still |
| * CO_FL_ERROR on the connection but we don't want to add |
| * SI_FL_ERR back, so give up |
| */ |
| if (si->state < SI_ST_CON) |
| return 0; |
| si->flags |= SI_FL_ERR; |
| return 1; |
| } |
| |
| /* We're already waiting to be able to send, give up */ |
| if (si->wait_event.events & SUB_RETRY_SEND) |
| return 0; |
| |
| /* we might have been called just after an asynchronous shutw */ |
| if (conn->flags & CO_FL_SOCK_WR_SH || oc->flags & CF_SHUTW) |
| return 1; |
| |
| if (oc->pipe && conn->xprt->snd_pipe && conn->mux->snd_pipe) { |
| ret = conn->mux->snd_pipe(cs, oc->pipe); |
| if (ret > 0) |
| did_send = 1; |
| |
| if (!oc->pipe->data) { |
| put_pipe(oc->pipe); |
| oc->pipe = NULL; |
| } |
| |
| if (oc->pipe) |
| goto end; |
| } |
| |
| /* At this point, the pipe is empty, but we may still have data pending |
| * in the normal buffer. |
| */ |
| if (co_data(oc)) { |
| /* when we're here, we already know that there is no spliced |
| * data left, and that there are sendable buffered data. |
| */ |
| |
| /* check if we want to inform the kernel that we're interested in |
| * sending more data after this call. We want this if : |
| * - we're about to close after this last send and want to merge |
| * the ongoing FIN with the last segment. |
| * - we know we can't send everything at once and must get back |
| * here because of unaligned data |
| * - there is still a finite amount of data to forward |
| * The test is arranged so that the most common case does only 2 |
| * tests. |
| */ |
| unsigned int send_flag = 0; |
| |
| if ((!(oc->flags & (CF_NEVER_WAIT|CF_SEND_DONTWAIT)) && |
| ((oc->to_forward && oc->to_forward != CHN_INFINITE_FORWARD) || |
| (oc->flags & CF_EXPECT_MORE))) || |
| ((oc->flags & CF_ISRESP) && |
| ((oc->flags & (CF_AUTO_CLOSE|CF_SHUTW_NOW)) == (CF_AUTO_CLOSE|CF_SHUTW_NOW)))) |
| send_flag |= CO_SFL_MSG_MORE; |
| |
| if (oc->flags & CF_STREAMER) |
| send_flag |= CO_SFL_STREAMER; |
| |
| if ((si->flags & SI_FL_L7_RETRY) && !b_data(&si->l7_buffer)) { |
| struct stream *s = si_strm(si); |
| /* If we want to be able to do L7 retries, copy |
| * the data we're about to send, so that we are able |
| * to resend them if needed |
| */ |
| /* Try to allocate a buffer if we had none. |
| * If it fails, the next test will just |
| * disable the l7 retries by setting |
| * l7_conn_retries to 0. |
| */ |
| if (!s->txn || (s->txn->req.msg_state != HTTP_MSG_DONE)) |
| si->flags &= ~SI_FL_L7_RETRY; |
| else { |
| if (b_is_null(&si->l7_buffer)) |
| b_alloc(&si->l7_buffer); |
| if (b_is_null(&si->l7_buffer)) |
| si->flags &= ~SI_FL_L7_RETRY; |
| else { |
| memcpy(b_orig(&si->l7_buffer), |
| b_orig(&oc->buf), |
| b_size(&oc->buf)); |
| si->l7_buffer.head = co_data(oc); |
| b_add(&si->l7_buffer, co_data(oc)); |
| } |
| |
| } |
| } |
| |
| ret = cs->conn->mux->snd_buf(cs, &oc->buf, co_data(oc), send_flag); |
| if (ret > 0) { |
| did_send = 1; |
| co_set_data(oc, co_data(oc) - ret); |
| c_realign_if_empty(oc); |
| |
| if (!co_data(oc)) { |
| /* Always clear both flags once everything has been sent, they're one-shot */ |
| oc->flags &= ~(CF_EXPECT_MORE | CF_SEND_DONTWAIT); |
| } |
| /* if some data remain in the buffer, it's only because the |
| * system buffers are full, we will try next time. |
| */ |
| } |
| } |
| |
| end: |
| if (did_send) { |
| oc->flags |= CF_WRITE_PARTIAL | CF_WROTE_DATA; |
| if (si->state == SI_ST_CON) |
| si->state = SI_ST_RDY; |
| |
| si_rx_room_rdy(si_opposite(si)); |
| } |
| |
| if (conn->flags & CO_FL_ERROR || cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING)) { |
| si->flags |= SI_FL_ERR; |
| return 1; |
| } |
| |
| /* We couldn't send all of our data, let the mux know we'd like to send more */ |
| if (!channel_is_empty(oc)) |
| conn->mux->subscribe(cs, SUB_RETRY_SEND, &si->wait_event); |
| return did_send; |
| } |
| |
| /* This is the ->process() function for any stream-interface's wait_event task. |
| * It's assigned during the stream-interface's initialization, for any type of |
| * stream interface. Thus it is always safe to perform a tasklet_wakeup() on a |
| * stream interface, as the presence of the CS is checked there. |
| */ |
| struct task *si_cs_io_cb(struct task *t, void *ctx, unsigned short state) |
| { |
| struct stream_interface *si = ctx; |
| struct conn_stream *cs = objt_cs(si->end); |
| int ret = 0; |
| |
| if (!cs) |
| return NULL; |
| |
| if (!(si->wait_event.events & SUB_RETRY_SEND) && !channel_is_empty(si_oc(si))) |
| ret = si_cs_send(cs); |
| if (!(si->wait_event.events & SUB_RETRY_RECV)) |
| ret |= si_cs_recv(cs); |
| if (ret != 0) |
| si_cs_process(cs); |
| |
| stream_release_buffers(si_strm(si)); |
| return (NULL); |
| } |
| |
| /* This function is designed to be called from within the stream handler to |
| * update the input channel's expiration timer and the stream interface's |
| * Rx flags based on the channel's flags. It needs to be called only once |
| * after the channel's flags have settled down, and before they are cleared, |
| * though it doesn't harm to call it as often as desired (it just slightly |
| * hurts performance). It must not be called from outside of the stream |
| * handler, as what it does will be used to compute the stream task's |
| * expiration. |
| */ |
| void si_update_rx(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| |
| if (ic->flags & CF_SHUTR) { |
| si_rx_shut_blk(si); |
| return; |
| } |
| |
| /* Read not closed, update FD status and timeout for reads */ |
| if (ic->flags & CF_DONT_READ) |
| si_rx_chan_blk(si); |
| else |
| si_rx_chan_rdy(si); |
| |
| if (!channel_is_empty(ic)) { |
| /* stop reading, imposed by channel's policy or contents */ |
| si_rx_room_blk(si); |
| } |
| else { |
| /* (re)start reading and update timeout. Note: we don't recompute the timeout |
| * everytime we get here, otherwise it would risk never to expire. We only |
| * update it if is was not yet set. The stream socket handler will already |
| * have updated it if there has been a completed I/O. |
| */ |
| si_rx_room_rdy(si); |
| } |
| if (si->flags & SI_FL_RXBLK_ANY & ~SI_FL_RX_WAIT_EP) |
| ic->rex = TICK_ETERNITY; |
| else if (!(ic->flags & CF_READ_NOEXP) && !tick_isset(ic->rex)) |
| ic->rex = tick_add_ifset(now_ms, ic->rto); |
| |
| si_chk_rcv(si); |
| } |
| |
| /* This function is designed to be called from within the stream handler to |
| * update the output channel's expiration timer and the stream interface's |
| * Tx flags based on the channel's flags. It needs to be called only once |
| * after the channel's flags have settled down, and before they are cleared, |
| * though it doesn't harm to call it as often as desired (it just slightly |
| * hurts performance). It must not be called from outside of the stream |
| * handler, as what it does will be used to compute the stream task's |
| * expiration. |
| */ |
| void si_update_tx(struct stream_interface *si) |
| { |
| struct channel *oc = si_oc(si); |
| struct channel *ic = si_ic(si); |
| |
| if (oc->flags & CF_SHUTW) |
| return; |
| |
| /* Write not closed, update FD status and timeout for writes */ |
| if (channel_is_empty(oc)) { |
| /* stop writing */ |
| if (!(si->flags & SI_FL_WAIT_DATA)) { |
| if ((oc->flags & CF_SHUTW_NOW) == 0) |
| si->flags |= SI_FL_WAIT_DATA; |
| oc->wex = TICK_ETERNITY; |
| } |
| return; |
| } |
| |
| /* (re)start writing and update timeout. Note: we don't recompute the timeout |
| * everytime we get here, otherwise it would risk never to expire. We only |
| * update it if is was not yet set. The stream socket handler will already |
| * have updated it if there has been a completed I/O. |
| */ |
| si->flags &= ~SI_FL_WAIT_DATA; |
| if (!tick_isset(oc->wex)) { |
| oc->wex = tick_add_ifset(now_ms, oc->wto); |
| if (tick_isset(ic->rex) && !(si->flags & SI_FL_INDEP_STR)) { |
| /* Note: depending on the protocol, we don't know if we're waiting |
| * for incoming data or not. So in order to prevent the socket from |
| * expiring read timeouts during writes, we refresh the read timeout, |
| * except if it was already infinite or if we have explicitly setup |
| * independent streams. |
| */ |
| ic->rex = tick_add_ifset(now_ms, ic->rto); |
| } |
| } |
| } |
| |
| /* perform a synchronous send() for the stream interface. The CF_WRITE_NULL and |
| * CF_WRITE_PARTIAL flags are cleared prior to the attempt, and will possibly |
| * be updated in case of success. |
| */ |
| void si_sync_send(struct stream_interface *si) |
| { |
| struct channel *oc = si_oc(si); |
| struct conn_stream *cs; |
| |
| oc->flags &= ~(CF_WRITE_NULL|CF_WRITE_PARTIAL); |
| |
| if (oc->flags & CF_SHUTW) |
| return; |
| |
| if (channel_is_empty(oc)) |
| return; |
| |
| if (!si_state_in(si->state, SI_SB_CON|SI_SB_RDY|SI_SB_EST)) |
| return; |
| |
| cs = objt_cs(si->end); |
| if (!cs || !cs->conn->mux) |
| return; |
| |
| si_cs_send(cs); |
| } |
| |
| /* Updates at once the channel flags, and timers of both stream interfaces of a |
| * same stream, to complete the work after the analysers, then updates the data |
| * layer below. This will ensure that any synchronous update performed at the |
| * data layer will be reflected in the channel flags and/or stream-interface. |
| * Note that this does not change the stream interface's current state, though |
| * it updates the previous state to the current one. |
| */ |
| void si_update_both(struct stream_interface *si_f, struct stream_interface *si_b) |
| { |
| struct channel *req = si_ic(si_f); |
| struct channel *res = si_oc(si_f); |
| |
| req->flags &= ~(CF_READ_NULL|CF_READ_PARTIAL|CF_READ_ATTACHED|CF_WRITE_NULL|CF_WRITE_PARTIAL); |
| res->flags &= ~(CF_READ_NULL|CF_READ_PARTIAL|CF_READ_ATTACHED|CF_WRITE_NULL|CF_WRITE_PARTIAL); |
| |
| si_f->prev_state = si_f->state; |
| si_b->prev_state = si_b->state; |
| |
| /* let's recompute both sides states */ |
| if (si_state_in(si_f->state, SI_SB_RDY|SI_SB_EST)) |
| si_update(si_f); |
| |
| if (si_state_in(si_b->state, SI_SB_RDY|SI_SB_EST)) |
| si_update(si_b); |
| |
| /* stream ints are processed outside of process_stream() and must be |
| * handled at the latest moment. |
| */ |
| if (obj_type(si_f->end) == OBJ_TYPE_APPCTX && |
| ((si_rx_endp_ready(si_f) && !si_rx_blocked(si_f)) || |
| (si_tx_endp_ready(si_f) && !si_tx_blocked(si_f)))) |
| appctx_wakeup(si_appctx(si_f)); |
| |
| if (obj_type(si_b->end) == OBJ_TYPE_APPCTX && |
| ((si_rx_endp_ready(si_b) && !si_rx_blocked(si_b)) || |
| (si_tx_endp_ready(si_b) && !si_tx_blocked(si_b)))) |
| appctx_wakeup(si_appctx(si_b)); |
| } |
| |
| /* |
| * This function performs a shutdown-read on a stream interface attached to |
| * a connection in a connected or init state (it does nothing for other |
| * states). It either shuts the read side or marks itself as closed. The buffer |
| * flags are updated to reflect the new state. If the stream interface has |
| * SI_FL_NOHALF, we also forward the close to the write side. If a control |
| * layer is defined, then it is supposed to be a socket layer and file |
| * descriptors are then shutdown or closed accordingly. The function |
| * automatically disables polling if needed. |
| */ |
| static void stream_int_shutr_conn(struct stream_interface *si) |
| { |
| struct conn_stream *cs = __objt_cs(si->end); |
| struct channel *ic = si_ic(si); |
| |
| si_rx_shut_blk(si); |
| if (ic->flags & CF_SHUTR) |
| return; |
| ic->flags |= CF_SHUTR; |
| ic->rex = TICK_ETERNITY; |
| |
| if (!si_state_in(si->state, SI_SB_CON|SI_SB_RDY|SI_SB_EST)) |
| return; |
| |
| if (si->flags & SI_FL_KILL_CONN) |
| cs->flags |= CS_FL_KILL_CONN; |
| |
| if (si_oc(si)->flags & CF_SHUTW) { |
| cs_close(cs); |
| si->state = SI_ST_DIS; |
| si->exp = TICK_ETERNITY; |
| } |
| else if (si->flags & SI_FL_NOHALF) { |
| /* we want to immediately forward this close to the write side */ |
| return stream_int_shutw_conn(si); |
| } |
| } |
| |
| /* |
| * This function performs a shutdown-write on a stream interface attached to |
| * a connection in a connected or init state (it does nothing for other |
| * states). It either shuts the write side or marks itself as closed. The |
| * buffer flags are updated to reflect the new state. It does also close |
| * everything if the SI was marked as being in error state. If there is a |
| * data-layer shutdown, it is called. |
| */ |
| static void stream_int_shutw_conn(struct stream_interface *si) |
| { |
| struct conn_stream *cs = __objt_cs(si->end); |
| struct connection *conn = cs->conn; |
| struct channel *ic = si_ic(si); |
| struct channel *oc = si_oc(si); |
| |
| oc->flags &= ~CF_SHUTW_NOW; |
| if (oc->flags & CF_SHUTW) |
| return; |
| oc->flags |= CF_SHUTW; |
| oc->wex = TICK_ETERNITY; |
| si_done_get(si); |
| |
| if (tick_isset(si->hcto)) { |
| ic->rto = si->hcto; |
| ic->rex = tick_add(now_ms, ic->rto); |
| } |
| |
| switch (si->state) { |
| case SI_ST_RDY: |
| case SI_ST_EST: |
| /* we have to shut before closing, otherwise some short messages |
| * may never leave the system, especially when there are remaining |
| * unread data in the socket input buffer, or when nolinger is set. |
| * However, if SI_FL_NOLINGER is explicitly set, we know there is |
| * no risk so we close both sides immediately. |
| */ |
| if (si->flags & SI_FL_KILL_CONN) |
| cs->flags |= CS_FL_KILL_CONN; |
| |
| if (si->flags & SI_FL_ERR) { |
| /* quick close, the socket is alredy shut anyway */ |
| } |
| else if (si->flags & SI_FL_NOLINGER) { |
| /* unclean data-layer shutdown, typically an aborted request |
| * or a forwarded shutdown from a client to a server due to |
| * option abortonclose. No need for the TLS layer to try to |
| * emit a shutdown message. |
| */ |
| cs_shutw(cs, CS_SHW_SILENT); |
| } |
| else { |
| /* clean data-layer shutdown. This only happens on the |
| * frontend side, or on the backend side when forwarding |
| * a client close in TCP mode or in HTTP TUNNEL mode |
| * while option abortonclose is set. We want the TLS |
| * layer to try to signal it to the peer before we close. |
| */ |
| cs_shutw(cs, CS_SHW_NORMAL); |
| |
| if (!(ic->flags & (CF_SHUTR|CF_DONT_READ))) { |
| /* OK just a shutw, but we want the caller |
| * to disable polling on this FD if exists. |
| */ |
| conn_cond_update_polling(conn); |
| return; |
| } |
| } |
| |
| /* fall through */ |
| case SI_ST_CON: |
| /* we may have to close a pending connection, and mark the |
| * response buffer as shutr |
| */ |
| if (si->flags & SI_FL_KILL_CONN) |
| cs->flags |= CS_FL_KILL_CONN; |
| cs_close(cs); |
| /* fall through */ |
| case SI_ST_CER: |
| case SI_ST_QUE: |
| case SI_ST_TAR: |
| si->state = SI_ST_DIS; |
| /* fall through */ |
| default: |
| si->flags &= ~SI_FL_NOLINGER; |
| si_rx_shut_blk(si); |
| ic->flags |= CF_SHUTR; |
| ic->rex = TICK_ETERNITY; |
| si->exp = TICK_ETERNITY; |
| } |
| } |
| |
| /* This function is used for inter-stream-interface calls. It is called by the |
| * consumer to inform the producer side that it may be interested in checking |
| * for free space in the buffer. Note that it intentionally does not update |
| * timeouts, so that we can still check them later at wake-up. This function is |
| * dedicated to connection-based stream interfaces. |
| */ |
| static void stream_int_chk_rcv_conn(struct stream_interface *si) |
| { |
| /* (re)start reading */ |
| if (si_state_in(si->state, SI_SB_CON|SI_SB_RDY|SI_SB_EST)) |
| tasklet_wakeup(si->wait_event.tasklet); |
| } |
| |
| |
| /* This function is used for inter-stream-interface calls. It is called by the |
| * producer to inform the consumer side that it may be interested in checking |
| * for data in the buffer. Note that it intentionally does not update timeouts, |
| * so that we can still check them later at wake-up. |
| */ |
| static void stream_int_chk_snd_conn(struct stream_interface *si) |
| { |
| struct channel *oc = si_oc(si); |
| struct conn_stream *cs = __objt_cs(si->end); |
| |
| if (unlikely(!si_state_in(si->state, SI_SB_CON|SI_SB_RDY|SI_SB_EST) || |
| (oc->flags & CF_SHUTW))) |
| return; |
| |
| if (unlikely(channel_is_empty(oc))) /* called with nothing to send ! */ |
| return; |
| |
| if (!oc->pipe && /* spliced data wants to be forwarded ASAP */ |
| !(si->flags & SI_FL_WAIT_DATA)) /* not waiting for data */ |
| return; |
| |
| if (!(si->wait_event.events & SUB_RETRY_SEND) && !channel_is_empty(si_oc(si))) |
| si_cs_send(cs); |
| |
| if (cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING) || cs->conn->flags & CO_FL_ERROR) { |
| /* Write error on the file descriptor */ |
| if (si->state >= SI_ST_CON) |
| si->flags |= SI_FL_ERR; |
| goto out_wakeup; |
| } |
| |
| /* OK, so now we know that some data might have been sent, and that we may |
| * have to poll first. We have to do that too if the buffer is not empty. |
| */ |
| if (channel_is_empty(oc)) { |
| /* the connection is established but we can't write. Either the |
| * buffer is empty, or we just refrain from sending because the |
| * ->o limit was reached. Maybe we just wrote the last |
| * chunk and need to close. |
| */ |
| if (((oc->flags & (CF_SHUTW|CF_AUTO_CLOSE|CF_SHUTW_NOW)) == |
| (CF_AUTO_CLOSE|CF_SHUTW_NOW)) && |
| si_state_in(si->state, SI_SB_RDY|SI_SB_EST)) { |
| si_shutw(si); |
| goto out_wakeup; |
| } |
| |
| if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0) |
| si->flags |= SI_FL_WAIT_DATA; |
| oc->wex = TICK_ETERNITY; |
| } |
| else { |
| /* Otherwise there are remaining data to be sent in the buffer, |
| * which means we have to poll before doing so. |
| */ |
| si->flags &= ~SI_FL_WAIT_DATA; |
| if (!tick_isset(oc->wex)) |
| oc->wex = tick_add_ifset(now_ms, oc->wto); |
| } |
| |
| if (likely(oc->flags & CF_WRITE_ACTIVITY)) { |
| struct channel *ic = si_ic(si); |
| |
| /* update timeout if we have written something */ |
| if ((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL && |
| !channel_is_empty(oc)) |
| oc->wex = tick_add_ifset(now_ms, oc->wto); |
| |
| if (tick_isset(ic->rex) && !(si->flags & SI_FL_INDEP_STR)) { |
| /* Note: to prevent the client from expiring read timeouts |
| * during writes, we refresh it. We only do this if the |
| * interface is not configured for "independent streams", |
| * because for some applications it's better not to do this, |
| * for instance when continuously exchanging small amounts |
| * of data which can full the socket buffers long before a |
| * write timeout is detected. |
| */ |
| ic->rex = tick_add_ifset(now_ms, ic->rto); |
| } |
| } |
| |
| /* in case of special condition (error, shutdown, end of write...), we |
| * have to notify the task. |
| */ |
| if (likely((oc->flags & (CF_WRITE_NULL|CF_WRITE_ERROR|CF_SHUTW)) || |
| ((oc->flags & CF_WAKE_WRITE) && |
| ((channel_is_empty(oc) && !oc->to_forward) || |
| !si_state_in(si->state, SI_SB_EST))))) { |
| out_wakeup: |
| if (!(si->flags & SI_FL_DONT_WAKE)) |
| task_wakeup(si_task(si), TASK_WOKEN_IO); |
| } |
| } |
| |
| /* |
| * This is the callback which is called by the connection layer to receive data |
| * into the buffer from the connection. It iterates over the mux layer's |
| * rcv_buf function. |
| */ |
| int si_cs_recv(struct conn_stream *cs) |
| { |
| struct connection *conn = cs->conn; |
| struct stream_interface *si = cs->data; |
| struct channel *ic = si_ic(si); |
| int ret, max, cur_read = 0; |
| int read_poll = MAX_READ_POLL_LOOPS; |
| int flags = 0; |
| |
| /* If not established yet, do nothing. */ |
| if (si->state != SI_ST_EST) |
| return 0; |
| |
| /* If another call to si_cs_recv() failed, and we subscribed to |
| * recv events already, give up now. |
| */ |
| if (si->wait_event.events & SUB_RETRY_RECV) |
| return 0; |
| |
| /* maybe we were called immediately after an asynchronous shutr */ |
| if (ic->flags & CF_SHUTR) |
| return 1; |
| |
| /* stop here if we reached the end of data */ |
| if (cs->flags & CS_FL_EOS) |
| goto end_recv; |
| |
| /* stop immediately on errors. Note that we DON'T want to stop on |
| * POLL_ERR, as the poller might report a write error while there |
| * are still data available in the recv buffer. This typically |
| * happens when we send too large a request to a backend server |
| * which rejects it before reading it all. |
| */ |
| if (!(cs->flags & CS_FL_RCV_MORE)) { |
| if (!conn_xprt_ready(conn)) |
| return 0; |
| if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) |
| goto end_recv; |
| } |
| |
| /* prepare to detect if the mux needs more room */ |
| cs->flags &= ~CS_FL_WANT_ROOM; |
| |
| if ((ic->flags & (CF_STREAMER | CF_STREAMER_FAST)) && !co_data(ic) && |
| global.tune.idle_timer && |
| (unsigned short)(now_ms - ic->last_read) >= global.tune.idle_timer) { |
| /* The buffer was empty and nothing was transferred for more |
| * than one second. This was caused by a pause and not by |
| * congestion. Reset any streaming mode to reduce latency. |
| */ |
| ic->xfer_small = 0; |
| ic->xfer_large = 0; |
| ic->flags &= ~(CF_STREAMER | CF_STREAMER_FAST); |
| } |
| |
| /* First, let's see if we may splice data across the channel without |
| * using a buffer. |
| */ |
| if (cs->flags & CS_FL_MAY_SPLICE && |
| (ic->pipe || ic->to_forward >= MIN_SPLICE_FORWARD) && |
| ic->flags & CF_KERN_SPLICING) { |
| if (c_data(ic)) { |
| /* We're embarrassed, there are already data pending in |
| * the buffer and we don't want to have them at two |
| * locations at a time. Let's indicate we need some |
| * place and ask the consumer to hurry. |
| */ |
| flags |= CO_RFL_BUF_FLUSH; |
| goto abort_splice; |
| } |
| |
| if (unlikely(ic->pipe == NULL)) { |
| if (pipes_used >= global.maxpipes || !(ic->pipe = get_pipe())) { |
| ic->flags &= ~CF_KERN_SPLICING; |
| goto abort_splice; |
| } |
| } |
| |
| ret = conn->mux->rcv_pipe(cs, ic->pipe, ic->to_forward); |
| if (ret < 0) { |
| /* splice not supported on this end, let's disable it */ |
| ic->flags &= ~CF_KERN_SPLICING; |
| goto abort_splice; |
| } |
| |
| if (ret > 0) { |
| if (ic->to_forward != CHN_INFINITE_FORWARD) |
| ic->to_forward -= ret; |
| ic->total += ret; |
| cur_read += ret; |
| ic->flags |= CF_READ_PARTIAL; |
| } |
| |
| if (conn->flags & CO_FL_ERROR || cs->flags & (CS_FL_EOS|CS_FL_ERROR)) |
| goto end_recv; |
| |
| if (conn->flags & CO_FL_WAIT_ROOM) { |
| /* the pipe is full or we have read enough data that it |
| * could soon be full. Let's stop before needing to poll. |
| */ |
| si_rx_room_blk(si); |
| goto done_recv; |
| } |
| |
| /* splice not possible (anymore), let's go on on standard copy */ |
| } |
| |
| abort_splice: |
| if (ic->pipe && unlikely(!ic->pipe->data)) { |
| put_pipe(ic->pipe); |
| ic->pipe = NULL; |
| } |
| |
| if (ic->pipe && ic->to_forward && !(flags & CO_RFL_BUF_FLUSH) && cs->flags & CS_FL_MAY_SPLICE) { |
| /* don't break splicing by reading, but still call rcv_buf() |
| * to pass the flag. |
| */ |
| goto done_recv; |
| } |
| |
| /* now we'll need a input buffer for the stream */ |
| if (!si_alloc_ibuf(si, &(si_strm(si)->buffer_wait))) |
| goto end_recv; |
| |
| /* Important note : if we're called with POLL_IN|POLL_HUP, it means the read polling |
| * was enabled, which implies that the recv buffer was not full. So we have a guarantee |
| * that if such an event is not handled above in splice, it will be handled here by |
| * recv(). |
| */ |
| while ((cs->flags & CS_FL_RCV_MORE) || |
| (!(conn->flags & (CO_FL_ERROR | CO_FL_HANDSHAKE)) && |
| (!(cs->flags & (CS_FL_ERROR|CS_FL_EOS))) && !(ic->flags & CF_SHUTR))) { |
| /* <max> may be null. This is the mux responsibility to set |
| * CS_FL_RCV_MORE on the CS if more space is needed. |
| */ |
| max = channel_recv_max(ic); |
| ret = cs->conn->mux->rcv_buf(cs, &ic->buf, max, flags | (co_data(ic) ? CO_RFL_BUF_WET : 0)); |
| |
| if (cs->flags & CS_FL_WANT_ROOM) |
| si_rx_room_blk(si); |
| |
| if (cs->flags & CS_FL_READ_PARTIAL) { |
| if (tick_isset(ic->rex)) |
| ic->rex = tick_add_ifset(now_ms, ic->rto); |
| cs->flags &= ~CS_FL_READ_PARTIAL; |
| } |
| |
| if (ret <= 0) { |
| /* if we refrained from reading because we asked for a |
| * flush to satisfy rcv_pipe(), we must not subscribe |
| * and instead report that there's not enough room |
| * here to proceed. |
| */ |
| if (flags & CO_RFL_BUF_FLUSH) |
| si_rx_room_blk(si); |
| break; |
| } |
| |
| /* L7 retries enabled and maximum connection retries not reached */ |
| if ((si->flags & SI_FL_L7_RETRY) && si->conn_retries) { |
| struct htx *htx; |
| struct htx_sl *sl; |
| |
| htx = htxbuf(&ic->buf); |
| if (htx) { |
| sl = http_get_stline(htx); |
| if (sl && l7_status_match(si_strm(si)->be, |
| sl->info.res.status)) { |
| /* If we got a status for which we would |
| * like to retry the request, empty |
| * the buffer and pretend there's an |
| * error on the channel. |
| */ |
| ic->flags |= CF_READ_ERROR; |
| htx_reset(htx); |
| return 1; |
| } |
| } |
| si->flags &= ~SI_FL_L7_RETRY; |
| } |
| cur_read += ret; |
| |
| /* if we're allowed to directly forward data, we must update ->o */ |
| if (ic->to_forward && !(ic->flags & (CF_SHUTW|CF_SHUTW_NOW))) { |
| unsigned long fwd = ret; |
| if (ic->to_forward != CHN_INFINITE_FORWARD) { |
| if (fwd > ic->to_forward) |
| fwd = ic->to_forward; |
| ic->to_forward -= fwd; |
| } |
| c_adv(ic, fwd); |
| } |
| |
| ic->flags |= CF_READ_PARTIAL; |
| ic->total += ret; |
| |
| if ((ic->flags & CF_READ_DONTWAIT) || --read_poll <= 0) { |
| /* we're stopped by the channel's policy */ |
| si_rx_chan_blk(si); |
| break; |
| } |
| |
| /* if too many bytes were missing from last read, it means that |
| * it's pointless trying to read again because the system does |
| * not have them in buffers. |
| */ |
| if (ret < max) { |
| /* if a streamer has read few data, it may be because we |
| * have exhausted system buffers. It's not worth trying |
| * again. |
| */ |
| if (ic->flags & CF_STREAMER) { |
| /* we're stopped by the channel's policy */ |
| si_rx_chan_blk(si); |
| break; |
| } |
| |
| /* if we read a large block smaller than what we requested, |
| * it's almost certain we'll never get anything more. |
| */ |
| if (ret >= global.tune.recv_enough) { |
| /* we're stopped by the channel's policy */ |
| si_rx_chan_blk(si); |
| break; |
| } |
| } |
| |
| /* if we are waiting for more space, don't try to read more data |
| * right now. |
| */ |
| if (si_rx_blocked(si)) |
| break; |
| } /* while !flags */ |
| |
| done_recv: |
| if (cur_read) { |
| if ((ic->flags & (CF_STREAMER | CF_STREAMER_FAST)) && |
| (cur_read <= ic->buf.size / 2)) { |
| ic->xfer_large = 0; |
| ic->xfer_small++; |
| if (ic->xfer_small >= 3) { |
| /* we have read less than half of the buffer in |
| * one pass, and this happened at least 3 times. |
| * This is definitely not a streamer. |
| */ |
| ic->flags &= ~(CF_STREAMER | CF_STREAMER_FAST); |
| } |
| else if (ic->xfer_small >= 2) { |
| /* if the buffer has been at least half full twice, |
| * we receive faster than we send, so at least it |
| * is not a "fast streamer". |
| */ |
| ic->flags &= ~CF_STREAMER_FAST; |
| } |
| } |
| else if (!(ic->flags & CF_STREAMER_FAST) && |
| (cur_read >= ic->buf.size - global.tune.maxrewrite)) { |
| /* we read a full buffer at once */ |
| ic->xfer_small = 0; |
| ic->xfer_large++; |
| if (ic->xfer_large >= 3) { |
| /* we call this buffer a fast streamer if it manages |
| * to be filled in one call 3 consecutive times. |
| */ |
| ic->flags |= (CF_STREAMER | CF_STREAMER_FAST); |
| } |
| } |
| else { |
| ic->xfer_small = 0; |
| ic->xfer_large = 0; |
| } |
| ic->last_read = now_ms; |
| } |
| |
| end_recv: |
| ret = (cur_read != 0); |
| |
| /* Report EOI on the channel if it was reached from the mux point of |
| * view. */ |
| if ((cs->flags & CS_FL_EOI) && !(ic->flags & CF_EOI)) { |
| ic->flags |= (CF_EOI|CF_READ_PARTIAL); |
| ret = 1; |
| } |
| |
| if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) { |
| cs->flags |= CS_FL_ERROR; |
| si->flags |= SI_FL_ERR; |
| ret = 1; |
| } |
| else if (cs->flags & CS_FL_EOS) { |
| /* connection closed */ |
| if (!(conn->flags & CO_FL_WAIT_L4L6)) { |
| /* we received a shutdown */ |
| ic->flags |= CF_READ_NULL; |
| if (ic->flags & CF_AUTO_CLOSE) |
| channel_shutw_now(ic); |
| stream_int_read0(si); |
| } |
| ret = 1; |
| } |
| else if (!si_rx_blocked(si)) { |
| /* Subscribe to receive events if we're blocking on I/O */ |
| conn->mux->subscribe(cs, SUB_RETRY_RECV, &si->wait_event); |
| si_rx_endp_done(si); |
| } else { |
| si_rx_endp_more(si); |
| ret = 1; |
| } |
| return ret; |
| } |
| |
| /* |
| * This function propagates a null read received on a socket-based connection. |
| * It updates the stream interface. If the stream interface has SI_FL_NOHALF, |
| * the close is also forwarded to the write side as an abort. |
| */ |
| static void stream_int_read0(struct stream_interface *si) |
| { |
| struct conn_stream *cs = __objt_cs(si->end); |
| struct channel *ic = si_ic(si); |
| struct channel *oc = si_oc(si); |
| |
| si_rx_shut_blk(si); |
| if (ic->flags & CF_SHUTR) |
| return; |
| ic->flags |= CF_SHUTR; |
| ic->rex = TICK_ETERNITY; |
| |
| if (!si_state_in(si->state, SI_SB_CON|SI_SB_RDY|SI_SB_EST)) |
| return; |
| |
| if (oc->flags & CF_SHUTW) |
| goto do_close; |
| |
| if (si->flags & SI_FL_NOHALF) { |
| /* we want to immediately forward this close to the write side */ |
| /* force flag on ssl to keep stream in cache */ |
| cs_shutw(cs, CS_SHW_SILENT); |
| goto do_close; |
| } |
| |
| /* otherwise that's just a normal read shutdown */ |
| return; |
| |
| do_close: |
| /* OK we completely close the socket here just as if we went through si_shut[rw]() */ |
| cs_close(cs); |
| |
| oc->flags &= ~CF_SHUTW_NOW; |
| oc->flags |= CF_SHUTW; |
| oc->wex = TICK_ETERNITY; |
| |
| si_done_get(si); |
| |
| si->state = SI_ST_DIS; |
| si->exp = TICK_ETERNITY; |
| return; |
| } |
| |
| /* Callback to be used by applet handlers upon completion. It updates the stream |
| * (which may or may not take this opportunity to try to forward data), then |
| * may re-enable the applet's based on the channels and stream interface's final |
| * states. |
| */ |
| void si_applet_wake_cb(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| |
| /* If the applet wants to write and the channel is closed, it's a |
| * broken pipe and it must be reported. |
| */ |
| if (!(si->flags & SI_FL_RX_WAIT_EP) && (ic->flags & CF_SHUTR)) |
| si->flags |= SI_FL_ERR; |
| |
| /* automatically mark the applet having data available if it reported |
| * begin blocked by the channel. |
| */ |
| if (si_rx_blocked(si)) |
| si_rx_endp_more(si); |
| |
| /* update the stream-int, channels, and possibly wake the stream up */ |
| stream_int_notify(si); |
| stream_release_buffers(si_strm(si)); |
| |
| /* stream_int_notify may have passed through chk_snd and released some |
| * RXBLK flags. Process_stream will consider those flags to wake up the |
| * appctx but in the case the task is not in runqueue we may have to |
| * wakeup the appctx immediately. |
| */ |
| if ((si_rx_endp_ready(si) && !si_rx_blocked(si)) || |
| (si_tx_endp_ready(si) && !si_tx_blocked(si))) |
| appctx_wakeup(si_appctx(si)); |
| } |
| |
| /* |
| * This function performs a shutdown-read on a stream interface attached to an |
| * applet in a connected or init state (it does nothing for other states). It |
| * either shuts the read side or marks itself as closed. The buffer flags are |
| * updated to reflect the new state. If the stream interface has SI_FL_NOHALF, |
| * we also forward the close to the write side. The owner task is woken up if |
| * it exists. |
| */ |
| static void stream_int_shutr_applet(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| |
| si_rx_shut_blk(si); |
| if (ic->flags & CF_SHUTR) |
| return; |
| ic->flags |= CF_SHUTR; |
| ic->rex = TICK_ETERNITY; |
| |
| /* Note: on shutr, we don't call the applet */ |
| |
| if (!si_state_in(si->state, SI_SB_CON|SI_SB_RDY|SI_SB_EST)) |
| return; |
| |
| if (si_oc(si)->flags & CF_SHUTW) { |
| si_applet_release(si); |
| si->state = SI_ST_DIS; |
| si->exp = TICK_ETERNITY; |
| } |
| else if (si->flags & SI_FL_NOHALF) { |
| /* we want to immediately forward this close to the write side */ |
| return stream_int_shutw_applet(si); |
| } |
| } |
| |
| /* |
| * This function performs a shutdown-write on a stream interface attached to an |
| * applet in a connected or init state (it does nothing for other states). It |
| * either shuts the write side or marks itself as closed. The buffer flags are |
| * updated to reflect the new state. It does also close everything if the SI |
| * was marked as being in error state. The owner task is woken up if it exists. |
| */ |
| static void stream_int_shutw_applet(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| struct channel *oc = si_oc(si); |
| |
| oc->flags &= ~CF_SHUTW_NOW; |
| if (oc->flags & CF_SHUTW) |
| return; |
| oc->flags |= CF_SHUTW; |
| oc->wex = TICK_ETERNITY; |
| si_done_get(si); |
| |
| if (tick_isset(si->hcto)) { |
| ic->rto = si->hcto; |
| ic->rex = tick_add(now_ms, ic->rto); |
| } |
| |
| /* on shutw we always wake the applet up */ |
| appctx_wakeup(si_appctx(si)); |
| |
| switch (si->state) { |
| case SI_ST_RDY: |
| case SI_ST_EST: |
| /* we have to shut before closing, otherwise some short messages |
| * may never leave the system, especially when there are remaining |
| * unread data in the socket input buffer, or when nolinger is set. |
| * However, if SI_FL_NOLINGER is explicitly set, we know there is |
| * no risk so we close both sides immediately. |
| */ |
| if (!(si->flags & (SI_FL_ERR | SI_FL_NOLINGER)) && |
| !(ic->flags & (CF_SHUTR|CF_DONT_READ))) |
| return; |
| |
| /* fall through */ |
| case SI_ST_CON: |
| case SI_ST_CER: |
| case SI_ST_QUE: |
| case SI_ST_TAR: |
| /* Note that none of these states may happen with applets */ |
| si_applet_release(si); |
| si->state = SI_ST_DIS; |
| default: |
| si->flags &= ~SI_FL_NOLINGER; |
| si_rx_shut_blk(si); |
| ic->flags |= CF_SHUTR; |
| ic->rex = TICK_ETERNITY; |
| si->exp = TICK_ETERNITY; |
| } |
| } |
| |
| /* chk_rcv function for applets */ |
| static void stream_int_chk_rcv_applet(struct stream_interface *si) |
| { |
| struct channel *ic = si_ic(si); |
| |
| DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n", |
| __FUNCTION__, |
| si, si->state, ic->flags, si_oc(si)->flags); |
| |
| if (!ic->pipe) { |
| /* (re)start reading */ |
| appctx_wakeup(si_appctx(si)); |
| } |
| } |
| |
| /* chk_snd function for applets */ |
| static void stream_int_chk_snd_applet(struct stream_interface *si) |
| { |
| struct channel *oc = si_oc(si); |
| |
| DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n", |
| __FUNCTION__, |
| si, si->state, si_ic(si)->flags, oc->flags); |
| |
| if (unlikely(si->state != SI_ST_EST || (oc->flags & CF_SHUTW))) |
| return; |
| |
| /* we only wake the applet up if it was waiting for some data */ |
| |
| if (!(si->flags & SI_FL_WAIT_DATA)) |
| return; |
| |
| if (!tick_isset(oc->wex)) |
| oc->wex = tick_add_ifset(now_ms, oc->wto); |
| |
| if (!channel_is_empty(oc)) { |
| /* (re)start sending */ |
| appctx_wakeup(si_appctx(si)); |
| } |
| } |
| |
| /* |
| * Local variables: |
| * c-indent-level: 8 |
| * c-basic-offset: 8 |
| * End: |
| */ |