Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Connection management functions |
| 3 | * |
| 4 | * Copyright 2000-2012 Willy Tarreau <w@1wt.eu> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <common/compat.h> |
| 14 | #include <common/config.h> |
| 15 | |
| 16 | #include <types/connection.h> |
Willy Tarreau | 2c6be84 | 2012-07-06 17:12:34 +0200 | [diff] [blame] | 17 | |
Willy Tarreau | 2da156f | 2012-07-23 15:07:23 +0200 | [diff] [blame] | 18 | #include <proto/proto_tcp.h> |
Willy Tarreau | 2c6be84 | 2012-07-06 17:12:34 +0200 | [diff] [blame] | 19 | #include <proto/stream_interface.h> |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 20 | |
| 21 | /* I/O callback for fd-based connections. It calls the read/write handlers |
| 22 | * provided by the connection's sock_ops, which must be valid. It returns |
| 23 | * FD_WAIT_*. |
| 24 | */ |
| 25 | int conn_fd_handler(int fd) |
| 26 | { |
Willy Tarreau | 8018471 | 2012-07-06 14:54:49 +0200 | [diff] [blame] | 27 | struct connection *conn = fdtab[fd].owner; |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 28 | int ret = 0; |
| 29 | |
Willy Tarreau | c76ae33 | 2012-07-12 15:32:13 +0200 | [diff] [blame] | 30 | if (unlikely(!conn)) |
Willy Tarreau | 2c6be84 | 2012-07-06 17:12:34 +0200 | [diff] [blame] | 31 | goto leave; |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 32 | |
Willy Tarreau | c76ae33 | 2012-07-12 15:32:13 +0200 | [diff] [blame] | 33 | process_handshake: |
| 34 | while (unlikely(conn->flags & CO_FL_HANDSHAKE)) { |
| 35 | if (unlikely(conn->flags & CO_FL_ERROR)) |
Willy Tarreau | 2c6be84 | 2012-07-06 17:12:34 +0200 | [diff] [blame] | 36 | goto leave; |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 37 | |
Willy Tarreau | c76ae33 | 2012-07-12 15:32:13 +0200 | [diff] [blame] | 38 | if (conn->flags & CO_FL_SI_SEND_PROXY) |
| 39 | if ((ret = conn_si_send_proxy(conn, CO_FL_SI_SEND_PROXY))) |
| 40 | goto leave; |
| 41 | } |
| 42 | |
| 43 | /* OK now we're in the data phase now */ |
| 44 | |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 45 | if (fdtab[fd].ev & (FD_POLL_IN | FD_POLL_HUP | FD_POLL_ERR)) |
Willy Tarreau | 239d718 | 2012-07-23 18:53:03 +0200 | [diff] [blame] | 46 | if (!conn->data->read(conn)) |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 47 | ret |= FD_WAIT_READ; |
| 48 | |
Willy Tarreau | c76ae33 | 2012-07-12 15:32:13 +0200 | [diff] [blame] | 49 | if (unlikely(conn->flags & CO_FL_ERROR)) |
Willy Tarreau | 2c6be84 | 2012-07-06 17:12:34 +0200 | [diff] [blame] | 50 | goto leave; |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 51 | |
Willy Tarreau | c76ae33 | 2012-07-12 15:32:13 +0200 | [diff] [blame] | 52 | /* It may happen during the data phase that a handshake is |
| 53 | * enabled again (eg: SSL) |
| 54 | */ |
| 55 | if (unlikely(conn->flags & CO_FL_HANDSHAKE)) |
| 56 | goto process_handshake; |
| 57 | |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 58 | if (fdtab[fd].ev & (FD_POLL_OUT | FD_POLL_ERR)) |
Willy Tarreau | 239d718 | 2012-07-23 18:53:03 +0200 | [diff] [blame] | 59 | if (!conn->data->write(conn)) |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 60 | ret |= FD_WAIT_WRITE; |
Willy Tarreau | 2da156f | 2012-07-23 15:07:23 +0200 | [diff] [blame] | 61 | |
Willy Tarreau | c76ae33 | 2012-07-12 15:32:13 +0200 | [diff] [blame] | 62 | if (unlikely(conn->flags & CO_FL_ERROR)) |
Willy Tarreau | 2da156f | 2012-07-23 15:07:23 +0200 | [diff] [blame] | 63 | goto leave; |
| 64 | |
Willy Tarreau | c76ae33 | 2012-07-12 15:32:13 +0200 | [diff] [blame] | 65 | /* It may happen during the data phase that a handshake is |
| 66 | * enabled again (eg: SSL) |
| 67 | */ |
| 68 | if (unlikely(conn->flags & CO_FL_HANDSHAKE)) |
| 69 | goto process_handshake; |
| 70 | |
| 71 | if (unlikely(conn->flags & CO_FL_WAIT_L4_CONN)) { |
Willy Tarreau | 2da156f | 2012-07-23 15:07:23 +0200 | [diff] [blame] | 72 | /* still waiting for a connection to establish and no data to |
| 73 | * send in order to probe it ? Then let's retry the connect(). |
| 74 | */ |
Willy Tarreau | 239d718 | 2012-07-23 18:53:03 +0200 | [diff] [blame] | 75 | if (!tcp_connect_probe(conn)) |
Willy Tarreau | 2da156f | 2012-07-23 15:07:23 +0200 | [diff] [blame] | 76 | ret |= FD_WAIT_WRITE; |
| 77 | } |
| 78 | |
Willy Tarreau | 2c6be84 | 2012-07-06 17:12:34 +0200 | [diff] [blame] | 79 | leave: |
Willy Tarreau | fd31e53 | 2012-07-23 18:24:25 +0200 | [diff] [blame] | 80 | if (conn->flags & CO_FL_NOTIFY_SI) |
| 81 | stream_sock_update_conn(conn); |
| 82 | |
Willy Tarreau | 8f8c92f | 2012-07-23 19:45:44 +0200 | [diff] [blame] | 83 | /* Last check, verify if the connection just established */ |
Willy Tarreau | c76ae33 | 2012-07-12 15:32:13 +0200 | [diff] [blame] | 84 | if (unlikely(!(conn->flags & (CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN | CO_FL_CONNECTED)))) |
Willy Tarreau | 8f8c92f | 2012-07-23 19:45:44 +0200 | [diff] [blame] | 85 | conn->flags |= CO_FL_CONNECTED; |
| 86 | |
Willy Tarreau | 61ace1b | 2012-07-23 12:14:26 +0200 | [diff] [blame] | 87 | /* remove the events before leaving */ |
| 88 | fdtab[fd].ev &= ~(FD_POLL_IN | FD_POLL_OUT | FD_POLL_HUP | FD_POLL_ERR); |
Willy Tarreau | 59f9839 | 2012-07-06 14:13:49 +0200 | [diff] [blame] | 89 | return ret; |
| 90 | } |