Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 1 | /* |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 2 | * Functions used to send/receive data using SOCK_STREAM sockets. |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 3 | * |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 4 | * Copyright 2000-2012 Willy Tarreau <w@1wt.eu> |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 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 | |
Willy Tarreau | 6b4aad4 | 2009-01-18 21:59:13 +0100 | [diff] [blame] | 13 | #define _GNU_SOURCE |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 14 | #include <errno.h> |
| 15 | #include <fcntl.h> |
| 16 | #include <stdio.h> |
| 17 | #include <stdlib.h> |
| 18 | |
| 19 | #include <sys/socket.h> |
| 20 | #include <sys/stat.h> |
| 21 | #include <sys/types.h> |
| 22 | |
Dmitry Sivachenko | caf5898 | 2009-08-24 15:11:06 +0400 | [diff] [blame] | 23 | #include <netinet/tcp.h> |
| 24 | |
Willy Tarreau | 2dd0d47 | 2006-06-29 17:53:05 +0200 | [diff] [blame] | 25 | #include <common/compat.h> |
Willy Tarreau | e3ba5f0 | 2006-06-29 18:54:54 +0200 | [diff] [blame] | 26 | #include <common/config.h> |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 27 | #include <common/debug.h> |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 28 | #include <common/standard.h> |
Willy Tarreau | 0c303ee | 2008-07-07 00:09:58 +0200 | [diff] [blame] | 29 | #include <common/ticks.h> |
Willy Tarreau | 2dd0d47 | 2006-06-29 17:53:05 +0200 | [diff] [blame] | 30 | #include <common/time.h> |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 31 | |
Willy Tarreau | 2d21279 | 2008-08-27 21:41:35 +0200 | [diff] [blame] | 32 | #include <proto/buffers.h> |
Willy Tarreau | 8b11708 | 2012-08-06 15:06:49 +0200 | [diff] [blame] | 33 | #include <proto/connection.h> |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 34 | #include <proto/fd.h> |
Willy Tarreau | eb47268 | 2010-05-28 18:46:57 +0200 | [diff] [blame] | 35 | #include <proto/freq_ctr.h> |
| 36 | #include <proto/log.h> |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 37 | #include <proto/pipe.h> |
Willy Tarreau | fe598a7 | 2010-09-21 21:48:23 +0200 | [diff] [blame] | 38 | #include <proto/protocols.h> |
Willy Tarreau | c63190d | 2012-05-11 14:23:52 +0200 | [diff] [blame] | 39 | #include <proto/sock_raw.h> |
Willy Tarreau | 73b013b | 2012-05-21 16:31:45 +0200 | [diff] [blame] | 40 | #include <proto/stream_interface.h> |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 41 | #include <proto/task.h> |
| 42 | |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 43 | #include <types/global.h> |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 44 | |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 45 | /* main event functions used to move data between sockets and buffers */ |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 46 | static void sock_raw_read(struct connection *conn); |
Willy Tarreau | 3d8903f | 2012-08-06 17:00:18 +0200 | [diff] [blame] | 47 | static void sock_raw_read0(struct stream_interface *si); |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 48 | |
| 49 | |
Willy Tarreau | 6b4aad4 | 2009-01-18 21:59:13 +0100 | [diff] [blame] | 50 | #if defined(CONFIG_HAP_LINUX_SPLICE) |
Willy Tarreau | 43d8fb2 | 2011-08-22 17:12:02 +0200 | [diff] [blame] | 51 | #include <common/splice.h> |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 52 | |
| 53 | /* A pipe contains 16 segments max, and it's common to see segments of 1448 bytes |
| 54 | * because of timestamps. Use this as a hint for not looping on splice(). |
| 55 | */ |
| 56 | #define SPLICE_FULL_HINT 16*1448 |
| 57 | |
Willy Tarreau | a9de333 | 2009-11-28 07:47:10 +0100 | [diff] [blame] | 58 | /* how many data we attempt to splice at once when the buffer is configured for |
| 59 | * infinite forwarding */ |
| 60 | #define MAX_SPLICE_AT_ONCE (1<<30) |
| 61 | |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 62 | /* Returns : |
| 63 | * -1 if splice is not possible or not possible anymore and we must switch to |
| 64 | * user-land copy (eg: to_forward reached) |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 65 | * 0 otherwise, including errors and close. |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 66 | * Sets : |
| 67 | * BF_READ_NULL |
| 68 | * BF_READ_PARTIAL |
| 69 | * BF_WRITE_PARTIAL (during copy) |
Willy Tarreau | ba0b63d | 2009-09-20 08:09:44 +0200 | [diff] [blame] | 70 | * BF_OUT_EMPTY (during copy) |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 71 | * SI_FL_ERR |
| 72 | * SI_FL_WAIT_ROOM |
| 73 | * (SI_FL_WAIT_RECV) |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 74 | * |
| 75 | * This function automatically allocates a pipe from the pipe pool. It also |
| 76 | * carefully ensures to clear b->pipe whenever it leaves the pipe empty. |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 77 | */ |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 78 | static int sock_raw_splice_in(struct buffer *b, struct stream_interface *si) |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 79 | { |
Willy Tarreau | 82a0456 | 2011-12-11 22:37:06 +0100 | [diff] [blame] | 80 | static int splice_detects_close; |
Willy Tarreau | fb7508a | 2012-05-21 16:47:54 +0200 | [diff] [blame] | 81 | int fd = si_fd(si); |
Willy Tarreau | 31971e5 | 2009-09-20 12:07:52 +0200 | [diff] [blame] | 82 | int ret; |
| 83 | unsigned long max; |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 84 | int retval = 0; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 85 | |
| 86 | if (!b->to_forward) |
| 87 | return -1; |
| 88 | |
| 89 | if (!(b->flags & BF_KERN_SPLICING)) |
| 90 | return -1; |
| 91 | |
Willy Tarreau | 02d6cfc | 2012-03-01 18:19:58 +0100 | [diff] [blame] | 92 | if (buffer_not_empty(b)) { |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 93 | /* We're embarrassed, there are already data pending in |
| 94 | * the buffer and we don't want to have them at two |
| 95 | * locations at a time. Let's indicate we need some |
| 96 | * place and ask the consumer to hurry. |
| 97 | */ |
| 98 | si->flags |= SI_FL_WAIT_ROOM; |
Willy Tarreau | f9dabec | 2012-08-17 17:33:53 +0200 | [diff] [blame] | 99 | conn_data_stop_recv(&si->conn); |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 100 | b->rex = TICK_ETERNITY; |
Willy Tarreau | 73b013b | 2012-05-21 16:31:45 +0200 | [diff] [blame] | 101 | si_chk_snd(b->cons); |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 102 | return 0; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 103 | } |
| 104 | |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 105 | if (unlikely(b->pipe == NULL)) { |
| 106 | if (pipes_used >= global.maxpipes || !(b->pipe = get_pipe())) { |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 107 | b->flags &= ~BF_KERN_SPLICING; |
| 108 | return -1; |
| 109 | } |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 110 | } |
| 111 | |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 112 | /* At this point, b->pipe is valid */ |
| 113 | |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 114 | while (1) { |
Willy Tarreau | a9de333 | 2009-11-28 07:47:10 +0100 | [diff] [blame] | 115 | if (b->to_forward == BUF_INFINITE_FORWARD) |
| 116 | max = MAX_SPLICE_AT_ONCE; |
| 117 | else |
| 118 | max = b->to_forward; |
| 119 | |
Willy Tarreau | 31971e5 | 2009-09-20 12:07:52 +0200 | [diff] [blame] | 120 | if (!max) { |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 121 | /* It looks like the buffer + the pipe already contain |
| 122 | * the maximum amount of data to be transferred. Try to |
| 123 | * send those data immediately on the other side if it |
| 124 | * is currently waiting. |
| 125 | */ |
| 126 | retval = -1; /* end of forwarding */ |
| 127 | break; |
| 128 | } |
| 129 | |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 130 | ret = splice(fd, NULL, b->pipe->prod, NULL, max, |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 131 | SPLICE_F_MOVE|SPLICE_F_NONBLOCK); |
| 132 | |
| 133 | if (ret <= 0) { |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 134 | if (ret == 0) { |
Willy Tarreau | 98b306b | 2009-01-25 11:11:32 +0100 | [diff] [blame] | 135 | /* connection closed. This is only detected by |
Willy Tarreau | 82a0456 | 2011-12-11 22:37:06 +0100 | [diff] [blame] | 136 | * recent kernels (>= 2.6.27.13). If we notice |
| 137 | * it works, we store the info for later use. |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 138 | */ |
Willy Tarreau | 82a0456 | 2011-12-11 22:37:06 +0100 | [diff] [blame] | 139 | splice_detects_close = 1; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 140 | b->flags |= BF_READ_NULL; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 141 | break; |
| 142 | } |
| 143 | |
| 144 | if (errno == EAGAIN) { |
| 145 | /* there are two reasons for EAGAIN : |
| 146 | * - nothing in the socket buffer (standard) |
| 147 | * - pipe is full |
Willy Tarreau | 98b306b | 2009-01-25 11:11:32 +0100 | [diff] [blame] | 148 | * - the connection is closed (kernel < 2.6.27.13) |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 149 | * Since we don't know if pipe is full, we'll |
| 150 | * stop if the pipe is not empty. Anyway, we |
| 151 | * will almost always fill/empty the pipe. |
| 152 | */ |
| 153 | |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 154 | if (b->pipe->data) { |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 155 | si->flags |= SI_FL_WAIT_ROOM; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 156 | break; |
| 157 | } |
| 158 | |
Willy Tarreau | 82a0456 | 2011-12-11 22:37:06 +0100 | [diff] [blame] | 159 | /* We don't know if the connection was closed, |
| 160 | * but if we know splice detects close, then we |
| 161 | * know it for sure. |
Willy Tarreau | 98b306b | 2009-01-25 11:11:32 +0100 | [diff] [blame] | 162 | * But if we're called upon POLLIN with an empty |
Willy Tarreau | 82a0456 | 2011-12-11 22:37:06 +0100 | [diff] [blame] | 163 | * pipe and get EAGAIN, it is suspect enough to |
Willy Tarreau | 98b306b | 2009-01-25 11:11:32 +0100 | [diff] [blame] | 164 | * try to fall back to the normal recv scheme |
| 165 | * which will be able to deal with the situation. |
| 166 | */ |
Willy Tarreau | 82a0456 | 2011-12-11 22:37:06 +0100 | [diff] [blame] | 167 | if (splice_detects_close) |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 168 | conn_data_poll_recv(&si->conn); /* we know for sure that it's EAGAIN */ |
Willy Tarreau | 82a0456 | 2011-12-11 22:37:06 +0100 | [diff] [blame] | 169 | else |
| 170 | retval = -1; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 171 | break; |
| 172 | } |
Willy Tarreau | dc340a9 | 2009-06-28 23:10:19 +0200 | [diff] [blame] | 173 | |
Willy Tarreau | a9de333 | 2009-11-28 07:47:10 +0100 | [diff] [blame] | 174 | if (errno == ENOSYS || errno == EINVAL) { |
Willy Tarreau | dc340a9 | 2009-06-28 23:10:19 +0200 | [diff] [blame] | 175 | /* splice not supported on this end, disable it */ |
| 176 | b->flags &= ~BF_KERN_SPLICING; |
| 177 | si->flags &= ~SI_FL_CAP_SPLICE; |
| 178 | put_pipe(b->pipe); |
| 179 | b->pipe = NULL; |
| 180 | return -1; |
| 181 | } |
| 182 | |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 183 | /* here we have another error */ |
| 184 | si->flags |= SI_FL_ERR; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 185 | break; |
| 186 | } /* ret <= 0 */ |
| 187 | |
Willy Tarreau | 31971e5 | 2009-09-20 12:07:52 +0200 | [diff] [blame] | 188 | if (b->to_forward != BUF_INFINITE_FORWARD) |
| 189 | b->to_forward -= ret; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 190 | b->total += ret; |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 191 | b->pipe->data += ret; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 192 | b->flags |= BF_READ_PARTIAL; |
Willy Tarreau | ba0b63d | 2009-09-20 08:09:44 +0200 | [diff] [blame] | 193 | b->flags &= ~BF_OUT_EMPTY; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 194 | |
Willy Tarreau | 6f4a82c | 2009-03-21 20:43:57 +0100 | [diff] [blame] | 195 | if (b->pipe->data >= SPLICE_FULL_HINT || |
| 196 | ret >= global.tune.recv_enough) { |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 197 | /* We've read enough of it for this time. */ |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 198 | break; |
| 199 | } |
| 200 | } /* while */ |
| 201 | |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 202 | if (unlikely(!b->pipe->data)) { |
| 203 | put_pipe(b->pipe); |
| 204 | b->pipe = NULL; |
| 205 | } |
| 206 | |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 207 | return retval; |
| 208 | } |
| 209 | |
Willy Tarreau | 6b4aad4 | 2009-01-18 21:59:13 +0100 | [diff] [blame] | 210 | #endif /* CONFIG_HAP_LINUX_SPLICE */ |
| 211 | |
| 212 | |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 213 | /* |
Willy Tarreau | d797128 | 2006-07-29 18:36:34 +0200 | [diff] [blame] | 214 | * this function is called on a read event from a stream socket. |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 215 | */ |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 216 | static void sock_raw_read(struct connection *conn) |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 217 | { |
Willy Tarreau | 239d718 | 2012-07-23 18:53:03 +0200 | [diff] [blame] | 218 | int fd = conn->t.sock.fd; |
Willy Tarreau | 8018471 | 2012-07-06 14:54:49 +0200 | [diff] [blame] | 219 | struct stream_interface *si = container_of(conn, struct stream_interface, conn); |
Willy Tarreau | 48adac5 | 2008-08-30 04:58:38 +0200 | [diff] [blame] | 220 | struct buffer *b = si->ib; |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 221 | int ret, max, cur_read; |
Willy Tarreau | b8949f1 | 2007-03-23 22:39:59 +0100 | [diff] [blame] | 222 | int read_poll = MAX_READ_POLL_LOOPS; |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 223 | |
| 224 | #ifdef DEBUG_FULL |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 225 | fprintf(stderr,"sock_raw_read : fd=%d, ev=0x%02x, owner=%p\n", fd, fdtab[fd].ev, fdtab[fd].owner); |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 226 | #endif |
Willy Tarreau | 7154365 | 2009-07-14 19:55:05 +0200 | [diff] [blame] | 227 | /* stop immediately on errors. Note that we DON'T want to stop on |
| 228 | * POLL_ERR, as the poller might report a write error while there |
| 229 | * are still data available in the recv buffer. This typically |
| 230 | * happens when we send too large a request to a backend server |
| 231 | * which rejects it before reading it all. |
| 232 | */ |
Willy Tarreau | 8018471 | 2012-07-06 14:54:49 +0200 | [diff] [blame] | 233 | if (conn->flags & CO_FL_ERROR) |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 234 | goto out_error; |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 235 | |
| 236 | /* stop here if we reached the end of data */ |
| 237 | if ((fdtab[fd].ev & (FD_POLL_IN|FD_POLL_HUP)) == FD_POLL_HUP) |
| 238 | goto out_shutdown_r; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 239 | |
Willy Tarreau | d06e711 | 2009-03-29 10:18:41 +0200 | [diff] [blame] | 240 | /* maybe we were called immediately after an asynchronous shutr */ |
| 241 | if (b->flags & BF_SHUTR) |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 242 | return; |
Willy Tarreau | d06e711 | 2009-03-29 10:18:41 +0200 | [diff] [blame] | 243 | |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 244 | #if defined(CONFIG_HAP_LINUX_SPLICE) |
Willy Tarreau | 14acc70 | 2011-05-11 20:47:24 +0200 | [diff] [blame] | 245 | if (b->to_forward >= MIN_SPLICE_FORWARD && b->flags & BF_KERN_SPLICING) { |
Willy Tarreau | 98b306b | 2009-01-25 11:11:32 +0100 | [diff] [blame] | 246 | |
| 247 | /* Under Linux, if FD_POLL_HUP is set, we have reached the end. |
| 248 | * Since older splice() implementations were buggy and returned |
| 249 | * EAGAIN on end of read, let's bypass the call to splice() now. |
| 250 | */ |
| 251 | if (fdtab[fd].ev & FD_POLL_HUP) |
| 252 | goto out_shutdown_r; |
| 253 | |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 254 | if (sock_raw_splice_in(b, si) >= 0) { |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 255 | if (si->flags & SI_FL_ERR) |
| 256 | goto out_error; |
| 257 | if (b->flags & BF_READ_NULL) |
| 258 | goto out_shutdown_r; |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 259 | return; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 260 | } |
| 261 | /* splice not possible (anymore), let's go on on standard copy */ |
| 262 | } |
| 263 | #endif |
Willy Tarreau | 8a7af60 | 2008-05-03 23:07:14 +0200 | [diff] [blame] | 264 | cur_read = 0; |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 265 | while (1) { |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 266 | max = bi_avail(b); |
Willy Tarreau | 864e825 | 2009-12-28 17:36:37 +0100 | [diff] [blame] | 267 | |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 268 | if (!max) { |
Willy Tarreau | 864e825 | 2009-12-28 17:36:37 +0100 | [diff] [blame] | 269 | b->flags |= BF_FULL; |
| 270 | si->flags |= SI_FL_WAIT_ROOM; |
| 271 | break; |
| 272 | } |
| 273 | |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 274 | /* |
| 275 | * 1. compute the maximum block size we can read at once. |
| 276 | */ |
Willy Tarreau | 02d6cfc | 2012-03-01 18:19:58 +0100 | [diff] [blame] | 277 | if (buffer_empty(b)) { |
Willy Tarreau | 03d60bb | 2009-01-09 11:13:00 +0100 | [diff] [blame] | 278 | /* let's realign the buffer to optimize I/O */ |
Willy Tarreau | a458b67 | 2012-03-05 11:17:50 +0100 | [diff] [blame] | 279 | b->p = b->data; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 280 | } |
Willy Tarreau | 89fa706 | 2012-03-02 16:13:16 +0100 | [diff] [blame] | 281 | else if (b->data + b->o < b->p && |
| 282 | b->p + b->i < b->data + b->size) { |
Willy Tarreau | 864e825 | 2009-12-28 17:36:37 +0100 | [diff] [blame] | 283 | /* remaining space wraps at the end, with a moving limit */ |
Willy Tarreau | 363a5bb | 2012-03-02 20:14:45 +0100 | [diff] [blame] | 284 | if (max > b->data + b->size - (b->p + b->i)) |
| 285 | max = b->data + b->size - (b->p + b->i); |
Willy Tarreau | 9c0fe59 | 2009-01-18 16:25:31 +0100 | [diff] [blame] | 286 | } |
Willy Tarreau | 864e825 | 2009-12-28 17:36:37 +0100 | [diff] [blame] | 287 | /* else max is already OK */ |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 288 | |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 289 | /* |
| 290 | * 2. read the largest possible block |
| 291 | */ |
Willy Tarreau | cc5cfcb | 2012-05-04 21:35:27 +0200 | [diff] [blame] | 292 | ret = recv(fd, bi_end(b), max, 0); |
Willy Tarreau | d6d0690 | 2009-08-19 11:22:33 +0200 | [diff] [blame] | 293 | |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 294 | if (ret > 0) { |
Willy Tarreau | 02d6cfc | 2012-03-01 18:19:58 +0100 | [diff] [blame] | 295 | b->i += ret; |
Willy Tarreau | 8a7af60 | 2008-05-03 23:07:14 +0200 | [diff] [blame] | 296 | cur_read += ret; |
Willy Tarreau | b38903c | 2008-11-23 21:33:29 +0100 | [diff] [blame] | 297 | |
Willy Tarreau | 2e046c6 | 2012-03-01 16:08:30 +0100 | [diff] [blame] | 298 | /* if we're allowed to directly forward data, we must update ->o */ |
Willy Tarreau | 31971e5 | 2009-09-20 12:07:52 +0200 | [diff] [blame] | 299 | if (b->to_forward && !(b->flags & (BF_SHUTW|BF_SHUTW_NOW))) { |
| 300 | unsigned long fwd = ret; |
| 301 | if (b->to_forward != BUF_INFINITE_FORWARD) { |
| 302 | if (fwd > b->to_forward) |
| 303 | fwd = b->to_forward; |
| 304 | b->to_forward -= fwd; |
| 305 | } |
Willy Tarreau | 328582c | 2012-05-05 23:32:27 +0200 | [diff] [blame] | 306 | b_adv(b, fwd); |
Willy Tarreau | 0abebcc | 2009-01-08 00:09:41 +0100 | [diff] [blame] | 307 | } |
Willy Tarreau | f890dc9 | 2008-12-13 21:12:26 +0100 | [diff] [blame] | 308 | |
Willy Tarreau | 8018471 | 2012-07-06 14:54:49 +0200 | [diff] [blame] | 309 | if (conn->flags & CO_FL_WAIT_L4_CONN) { |
| 310 | conn->flags &= ~CO_FL_WAIT_L4_CONN; |
Willy Tarreau | 8ae52cb | 2012-05-20 10:38:46 +0200 | [diff] [blame] | 311 | si->exp = TICK_ETERNITY; |
| 312 | } |
Willy Tarreau | b38903c | 2008-11-23 21:33:29 +0100 | [diff] [blame] | 313 | |
Willy Tarreau | 3da77c5 | 2008-08-29 09:58:42 +0200 | [diff] [blame] | 314 | b->flags |= BF_READ_PARTIAL; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 315 | b->total += ret; |
Willy Tarreau | 9641e8f | 2007-03-23 23:02:09 +0100 | [diff] [blame] | 316 | |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 317 | if (bi_full(b)) { |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 318 | /* The buffer is now full, there's no point in going through |
| 319 | * the loop again. |
| 320 | */ |
Willy Tarreau | 02d6cfc | 2012-03-01 18:19:58 +0100 | [diff] [blame] | 321 | if (!(b->flags & BF_STREAMER_FAST) && (cur_read == buffer_len(b))) { |
Willy Tarreau | 8a7af60 | 2008-05-03 23:07:14 +0200 | [diff] [blame] | 322 | b->xfer_small = 0; |
| 323 | b->xfer_large++; |
| 324 | if (b->xfer_large >= 3) { |
| 325 | /* we call this buffer a fast streamer if it manages |
| 326 | * to be filled in one call 3 consecutive times. |
| 327 | */ |
| 328 | b->flags |= (BF_STREAMER | BF_STREAMER_FAST); |
| 329 | //fputc('+', stderr); |
| 330 | } |
| 331 | } |
| 332 | else if ((b->flags & (BF_STREAMER | BF_STREAMER_FAST)) && |
Willy Tarreau | a07a34e | 2009-08-16 23:27:46 +0200 | [diff] [blame] | 333 | (cur_read <= b->size / 2)) { |
Willy Tarreau | 8a7af60 | 2008-05-03 23:07:14 +0200 | [diff] [blame] | 334 | b->xfer_large = 0; |
| 335 | b->xfer_small++; |
| 336 | if (b->xfer_small >= 2) { |
| 337 | /* if the buffer has been at least half full twice, |
| 338 | * we receive faster than we send, so at least it |
| 339 | * is not a "fast streamer". |
| 340 | */ |
| 341 | b->flags &= ~BF_STREAMER_FAST; |
| 342 | //fputc('-', stderr); |
| 343 | } |
| 344 | } |
| 345 | else { |
| 346 | b->xfer_small = 0; |
| 347 | b->xfer_large = 0; |
| 348 | } |
Willy Tarreau | 9c0fe59 | 2009-01-18 16:25:31 +0100 | [diff] [blame] | 349 | |
| 350 | b->flags |= BF_FULL; |
Willy Tarreau | a456f2a | 2009-01-18 17:38:44 +0100 | [diff] [blame] | 351 | si->flags |= SI_FL_WAIT_ROOM; |
Willy Tarreau | 9c0fe59 | 2009-01-18 16:25:31 +0100 | [diff] [blame] | 352 | break; |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 353 | } |
| 354 | |
Willy Tarreau | ab3e1d3 | 2007-06-03 14:10:36 +0200 | [diff] [blame] | 355 | /* if too many bytes were missing from last read, it means that |
| 356 | * it's pointless trying to read again because the system does |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 357 | * not have them in buffers. BTW, if FD_POLL_HUP was present, |
| 358 | * it means that we have reached the end and that the connection |
| 359 | * is closed. |
Willy Tarreau | ab3e1d3 | 2007-06-03 14:10:36 +0200 | [diff] [blame] | 360 | */ |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 361 | if (ret < max) { |
Willy Tarreau | 8a7af60 | 2008-05-03 23:07:14 +0200 | [diff] [blame] | 362 | if ((b->flags & (BF_STREAMER | BF_STREAMER_FAST)) && |
Willy Tarreau | a07a34e | 2009-08-16 23:27:46 +0200 | [diff] [blame] | 363 | (cur_read <= b->size / 2)) { |
Willy Tarreau | 8a7af60 | 2008-05-03 23:07:14 +0200 | [diff] [blame] | 364 | b->xfer_large = 0; |
| 365 | b->xfer_small++; |
| 366 | if (b->xfer_small >= 3) { |
| 367 | /* we have read less than half of the buffer in |
| 368 | * one pass, and this happened at least 3 times. |
| 369 | * This is definitely not a streamer. |
| 370 | */ |
| 371 | b->flags &= ~(BF_STREAMER | BF_STREAMER_FAST); |
| 372 | //fputc('!', stderr); |
| 373 | } |
| 374 | } |
Willy Tarreau | 2bea3a1 | 2008-08-28 09:47:43 +0200 | [diff] [blame] | 375 | /* unfortunately, on level-triggered events, POLL_HUP |
| 376 | * is generally delivered AFTER the system buffer is |
| 377 | * empty, so this one might never match. |
| 378 | */ |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 379 | if (fdtab[fd].ev & FD_POLL_HUP) |
| 380 | goto out_shutdown_r; |
Willy Tarreau | 2bea3a1 | 2008-08-28 09:47:43 +0200 | [diff] [blame] | 381 | |
| 382 | /* if a streamer has read few data, it may be because we |
| 383 | * have exhausted system buffers. It's not worth trying |
| 384 | * again. |
| 385 | */ |
| 386 | if (b->flags & BF_STREAMER) |
| 387 | break; |
Willy Tarreau | ab3e1d3 | 2007-06-03 14:10:36 +0200 | [diff] [blame] | 388 | |
Willy Tarreau | 6f4a82c | 2009-03-21 20:43:57 +0100 | [diff] [blame] | 389 | /* generally if we read something smaller than 1 or 2 MSS, |
| 390 | * it means that either we have exhausted the system's |
| 391 | * buffers (streamer or question-response protocol) or |
| 392 | * that the connection will be closed. Streamers are |
| 393 | * easily detected so we return early. For other cases, |
| 394 | * it's still better to perform a last read to be sure, |
| 395 | * because it may save one complete poll/read/wakeup cycle |
| 396 | * in case of shutdown. |
| 397 | */ |
| 398 | if (ret < MIN_RET_FOR_READ_LOOP && b->flags & BF_STREAMER) |
| 399 | break; |
| 400 | |
| 401 | /* if we read a large block smaller than what we requested, |
| 402 | * it's almost certain we'll never get anything more. |
| 403 | */ |
| 404 | if (ret >= global.tune.recv_enough) |
| 405 | break; |
| 406 | } |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 407 | |
Willy Tarreau | 1b194fe | 2009-03-21 21:10:04 +0100 | [diff] [blame] | 408 | if ((b->flags & BF_READ_DONTWAIT) || --read_poll <= 0) |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 409 | break; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 410 | } |
| 411 | else if (ret == 0) { |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 412 | /* connection closed */ |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 413 | goto out_shutdown_r; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 414 | } |
Willy Tarreau | 9f19529 | 2007-04-15 21:26:58 +0200 | [diff] [blame] | 415 | else if (errno == EAGAIN) { |
| 416 | /* Ignore EAGAIN but inform the poller that there is |
Willy Tarreau | af78d0f | 2009-01-08 10:09:08 +0100 | [diff] [blame] | 417 | * nothing to read left if we did not read much, ie |
| 418 | * less than what we were still expecting to read. |
| 419 | * But we may have done some work justifying to notify |
| 420 | * the task. |
Willy Tarreau | 9f19529 | 2007-04-15 21:26:58 +0200 | [diff] [blame] | 421 | */ |
Willy Tarreau | af78d0f | 2009-01-08 10:09:08 +0100 | [diff] [blame] | 422 | if (cur_read < MIN_RET_FOR_READ_LOOP) |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 423 | conn_data_poll_recv(conn); |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 424 | break; |
| 425 | } |
| 426 | else { |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 427 | goto out_error; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 428 | } |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 429 | } /* while (1) */ |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 430 | |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 431 | return; |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 432 | |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 433 | out_shutdown_r: |
Willy Tarreau | e5ed406 | 2008-08-30 03:17:31 +0200 | [diff] [blame] | 434 | /* we received a shutdown */ |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 435 | fdtab[fd].ev &= ~FD_POLL_HUP; |
| 436 | b->flags |= BF_READ_NULL; |
Willy Tarreau | 520d95e | 2009-09-19 21:04:57 +0200 | [diff] [blame] | 437 | if (b->flags & BF_AUTO_CLOSE) |
Willy Tarreau | 418fd47 | 2009-09-06 21:37:23 +0200 | [diff] [blame] | 438 | buffer_shutw_now(b); |
Willy Tarreau | 3d8903f | 2012-08-06 17:00:18 +0200 | [diff] [blame] | 439 | sock_raw_read0(si); |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 440 | return; |
Willy Tarreau | d6f087e | 2008-01-18 17:20:13 +0100 | [diff] [blame] | 441 | |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 442 | out_error: |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 443 | /* Read error on the connection, report the error and stop I/O */ |
Willy Tarreau | 8018471 | 2012-07-06 14:54:49 +0200 | [diff] [blame] | 444 | conn->flags |= CO_FL_ERROR; |
Willy Tarreau | f9dabec | 2012-08-17 17:33:53 +0200 | [diff] [blame] | 445 | conn_data_stop_both(conn); |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | |
| 449 | /* |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 450 | * This function is called to send buffer data to a stream socket. |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 451 | * It returns -1 in case of unrecoverable error, otherwise zero. |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 452 | */ |
Willy Tarreau | fae4499 | 2012-08-20 14:02:10 +0200 | [diff] [blame] | 453 | static int sock_raw_write_loop(struct connection *conn) |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 454 | { |
Willy Tarreau | fae4499 | 2012-08-20 14:02:10 +0200 | [diff] [blame] | 455 | struct stream_interface *si = container_of(conn, struct stream_interface, conn); |
| 456 | struct buffer *b = si->ob; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 457 | int write_poll = MAX_WRITE_POLL_LOOPS; |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 458 | int ret, max; |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 459 | |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 460 | #if defined(CONFIG_HAP_LINUX_SPLICE) |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 461 | while (b->pipe) { |
Willy Tarreau | fb7508a | 2012-05-21 16:47:54 +0200 | [diff] [blame] | 462 | ret = splice(b->pipe->cons, NULL, si_fd(si), NULL, b->pipe->data, |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 463 | SPLICE_F_MOVE|SPLICE_F_NONBLOCK); |
| 464 | if (ret <= 0) { |
| 465 | if (ret == 0 || errno == EAGAIN) { |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 466 | conn_data_poll_send(&si->conn); |
| 467 | return 0; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 468 | } |
| 469 | /* here we have another error */ |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 470 | return -1; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 471 | } |
| 472 | |
| 473 | b->flags |= BF_WRITE_PARTIAL; |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 474 | b->pipe->data -= ret; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 475 | |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 476 | if (!b->pipe->data) { |
| 477 | put_pipe(b->pipe); |
| 478 | b->pipe = NULL; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 479 | break; |
Willy Tarreau | 3eba98a | 2009-01-25 13:56:13 +0100 | [diff] [blame] | 480 | } |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 481 | |
| 482 | if (--write_poll <= 0) |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 483 | return 0; |
Willy Tarreau | eb9fd51 | 2011-12-11 22:11:47 +0100 | [diff] [blame] | 484 | |
| 485 | /* The only reason we did not empty the pipe is that the output |
| 486 | * buffer is full. |
| 487 | */ |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 488 | conn_data_poll_send(&si->conn); |
Willy Tarreau | eb9fd51 | 2011-12-11 22:11:47 +0100 | [diff] [blame] | 489 | return 0; |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | /* At this point, the pipe is empty, but we may still have data pending |
| 493 | * in the normal buffer. |
| 494 | */ |
Willy Tarreau | 5bd8c37 | 2009-01-19 00:32:22 +0100 | [diff] [blame] | 495 | #endif |
Willy Tarreau | 2e046c6 | 2012-03-01 16:08:30 +0100 | [diff] [blame] | 496 | if (!b->o) { |
Willy Tarreau | ba0b63d | 2009-09-20 08:09:44 +0200 | [diff] [blame] | 497 | b->flags |= BF_OUT_EMPTY; |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 498 | return 0; |
Willy Tarreau | ba0b63d | 2009-09-20 08:09:44 +0200 | [diff] [blame] | 499 | } |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 500 | |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 501 | /* when we're in this loop, we already know that there is no spliced |
| 502 | * data left, and that there are sendable buffered data. |
| 503 | */ |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 504 | while (1) { |
Willy Tarreau | 89fa706 | 2012-03-02 16:13:16 +0100 | [diff] [blame] | 505 | max = b->o; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 506 | |
Willy Tarreau | 89fa706 | 2012-03-02 16:13:16 +0100 | [diff] [blame] | 507 | /* outgoing data may wrap at the end */ |
| 508 | if (b->data + max > b->p) |
| 509 | max = b->data + max - b->p; |
Willy Tarreau | f890dc9 | 2008-12-13 21:12:26 +0100 | [diff] [blame] | 510 | |
Willy Tarreau | 6db06d3 | 2009-08-19 11:14:11 +0200 | [diff] [blame] | 511 | /* check if we want to inform the kernel that we're interested in |
| 512 | * sending more data after this call. We want this if : |
| 513 | * - we're about to close after this last send and want to merge |
| 514 | * the ongoing FIN with the last segment. |
| 515 | * - we know we can't send everything at once and must get back |
| 516 | * here because of unaligned data |
Willy Tarreau | d38b53b | 2010-01-03 11:18:34 +0100 | [diff] [blame] | 517 | * - there is still a finite amount of data to forward |
Willy Tarreau | 6db06d3 | 2009-08-19 11:14:11 +0200 | [diff] [blame] | 518 | * The test is arranged so that the most common case does only 2 |
| 519 | * tests. |
Willy Tarreau | fb14edc | 2009-06-14 15:24:37 +0200 | [diff] [blame] | 520 | */ |
Willy Tarreau | fb14edc | 2009-06-14 15:24:37 +0200 | [diff] [blame] | 521 | |
Willy Tarreau | face839 | 2010-01-03 11:37:54 +0100 | [diff] [blame] | 522 | if (MSG_NOSIGNAL && MSG_MORE) { |
Willy Tarreau | 6db06d3 | 2009-08-19 11:14:11 +0200 | [diff] [blame] | 523 | unsigned int send_flag = MSG_DONTWAIT | MSG_NOSIGNAL; |
| 524 | |
Willy Tarreau | 96e3121 | 2011-05-30 18:10:30 +0200 | [diff] [blame] | 525 | if ((!(b->flags & BF_NEVER_WAIT) && |
| 526 | ((b->to_forward && b->to_forward != BUF_INFINITE_FORWARD) || |
| 527 | (b->flags & BF_EXPECT_MORE))) || |
Willy Tarreau | 2e046c6 | 2012-03-01 16:08:30 +0100 | [diff] [blame] | 528 | ((b->flags & (BF_SHUTW|BF_SHUTW_NOW|BF_HIJACK)) == BF_SHUTW_NOW && (max == b->o)) || |
Willy Tarreau | 02d6cfc | 2012-03-01 18:19:58 +0100 | [diff] [blame] | 529 | (max != b->o)) { |
Willy Tarreau | face839 | 2010-01-03 11:37:54 +0100 | [diff] [blame] | 530 | send_flag |= MSG_MORE; |
| 531 | } |
Willy Tarreau | 6db06d3 | 2009-08-19 11:14:11 +0200 | [diff] [blame] | 532 | |
Willy Tarreau | 2be3939 | 2010-01-03 17:24:51 +0100 | [diff] [blame] | 533 | /* this flag has precedence over the rest */ |
| 534 | if (b->flags & BF_SEND_DONTWAIT) |
| 535 | send_flag &= ~MSG_MORE; |
| 536 | |
Willy Tarreau | fb7508a | 2012-05-21 16:47:54 +0200 | [diff] [blame] | 537 | ret = send(si_fd(si), bo_ptr(b), max, send_flag); |
Willy Tarreau | d6d0690 | 2009-08-19 11:22:33 +0200 | [diff] [blame] | 538 | } else { |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 539 | int skerr; |
| 540 | socklen_t lskerr = sizeof(skerr); |
| 541 | |
Willy Tarreau | fb7508a | 2012-05-21 16:47:54 +0200 | [diff] [blame] | 542 | ret = getsockopt(si_fd(si), SOL_SOCKET, SO_ERROR, &skerr, &lskerr); |
Willy Tarreau | c642348 | 2006-10-15 14:59:03 +0200 | [diff] [blame] | 543 | if (ret == -1 || skerr) |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 544 | ret = -1; |
| 545 | else |
Willy Tarreau | fb7508a | 2012-05-21 16:47:54 +0200 | [diff] [blame] | 546 | ret = send(si_fd(si), bo_ptr(b), max, MSG_DONTWAIT); |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 547 | } |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 548 | |
| 549 | if (ret > 0) { |
Willy Tarreau | 505e34a | 2012-07-06 10:17:53 +0200 | [diff] [blame] | 550 | if (si->conn.flags & CO_FL_WAIT_L4_CONN) { |
| 551 | si->conn.flags &= ~CO_FL_WAIT_L4_CONN; |
Willy Tarreau | 8ae52cb | 2012-05-20 10:38:46 +0200 | [diff] [blame] | 552 | si->exp = TICK_ETERNITY; |
| 553 | } |
Willy Tarreau | b38903c | 2008-11-23 21:33:29 +0100 | [diff] [blame] | 554 | |
Willy Tarreau | 3da77c5 | 2008-08-29 09:58:42 +0200 | [diff] [blame] | 555 | b->flags |= BF_WRITE_PARTIAL; |
Willy Tarreau | e393fe2 | 2008-08-16 22:18:07 +0200 | [diff] [blame] | 556 | |
Willy Tarreau | 02d6cfc | 2012-03-01 18:19:58 +0100 | [diff] [blame] | 557 | b->o -= ret; |
| 558 | if (likely(!buffer_len(b))) |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 559 | /* optimize data alignment in the buffer */ |
Willy Tarreau | a458b67 | 2012-03-05 11:17:50 +0100 | [diff] [blame] | 560 | b->p = b->data; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 561 | |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 562 | if (likely(!bi_full(b))) |
Willy Tarreau | 02d6cfc | 2012-03-01 18:19:58 +0100 | [diff] [blame] | 563 | b->flags &= ~BF_FULL; |
| 564 | |
Willy Tarreau | 2e046c6 | 2012-03-01 16:08:30 +0100 | [diff] [blame] | 565 | if (!b->o) { |
Willy Tarreau | f17810e | 2012-03-09 18:10:44 +0100 | [diff] [blame] | 566 | /* Always clear both flags once everything has been sent, they're one-shot */ |
| 567 | b->flags &= ~(BF_EXPECT_MORE | BF_SEND_DONTWAIT); |
Willy Tarreau | ba0b63d | 2009-09-20 08:09:44 +0200 | [diff] [blame] | 568 | if (likely(!b->pipe)) |
| 569 | b->flags |= BF_OUT_EMPTY; |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 570 | break; |
Willy Tarreau | ba0b63d | 2009-09-20 08:09:44 +0200 | [diff] [blame] | 571 | } |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 572 | |
Willy Tarreau | ab3e1d3 | 2007-06-03 14:10:36 +0200 | [diff] [blame] | 573 | /* if the system buffer is full, don't insist */ |
| 574 | if (ret < max) |
| 575 | break; |
| 576 | |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 577 | if (--write_poll <= 0) |
| 578 | break; |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 579 | } |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 580 | else if (ret == 0 || errno == EAGAIN) { |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 581 | /* nothing written, we need to poll for write first */ |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 582 | conn_data_poll_send(&si->conn); |
| 583 | return 0; |
Willy Tarreau | 8374918 | 2007-04-15 20:56:27 +0200 | [diff] [blame] | 584 | } |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 585 | else { |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 586 | /* bad, we got an error */ |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 587 | return -1; |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 588 | } |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 589 | } /* while (1) */ |
Willy Tarreau | afad0e0 | 2012-08-09 14:45:22 +0200 | [diff] [blame] | 590 | return 0; |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 591 | } |
Willy Tarreau | 6996e15 | 2007-04-30 14:37:43 +0200 | [diff] [blame] | 592 | |
Willy Tarreau | 0c2fc1f | 2009-01-18 15:30:37 +0100 | [diff] [blame] | 593 | |
| 594 | /* |
Willy Tarreau | 3d8903f | 2012-08-06 17:00:18 +0200 | [diff] [blame] | 595 | * This function propagates a null read received on a connection. It updates |
| 596 | * the stream interface. If the stream interface has SI_FL_NOHALF, we also |
| 597 | * forward the close to the write side. |
| 598 | */ |
| 599 | static void sock_raw_read0(struct stream_interface *si) |
| 600 | { |
| 601 | si->ib->flags &= ~BF_SHUTR_NOW; |
| 602 | if (si->ib->flags & BF_SHUTR) |
| 603 | return; |
| 604 | si->ib->flags |= BF_SHUTR; |
| 605 | si->ib->rex = TICK_ETERNITY; |
| 606 | si->flags &= ~SI_FL_WAIT_ROOM; |
| 607 | |
| 608 | if (si->state != SI_ST_EST && si->state != SI_ST_CON) |
| 609 | return; |
| 610 | |
| 611 | if (si->ob->flags & BF_SHUTW) |
| 612 | goto do_close; |
| 613 | |
| 614 | if (si->flags & SI_FL_NOHALF) { |
| 615 | /* we have to shut before closing, otherwise some short messages |
| 616 | * may never leave the system, especially when there are remaining |
| 617 | * unread data in the socket input buffer, or when nolinger is set. |
| 618 | * However, if SI_FL_NOLINGER is explicitly set, we know there is |
| 619 | * no risk so we close both sides immediately. |
| 620 | */ |
| 621 | if (si->flags & SI_FL_NOLINGER) { |
| 622 | si->flags &= ~SI_FL_NOLINGER; |
| 623 | setsockopt(si_fd(si), SOL_SOCKET, SO_LINGER, |
| 624 | (struct linger *) &nolinger, sizeof(struct linger)); |
| 625 | } |
| 626 | goto do_close; |
| 627 | } |
| 628 | |
| 629 | /* otherwise that's just a normal read shutdown */ |
Willy Tarreau | f9dabec | 2012-08-17 17:33:53 +0200 | [diff] [blame] | 630 | conn_data_stop_recv(&si->conn); |
Willy Tarreau | 3d8903f | 2012-08-06 17:00:18 +0200 | [diff] [blame] | 631 | return; |
| 632 | |
| 633 | do_close: |
| 634 | conn_data_close(&si->conn); |
| 635 | fd_delete(si_fd(si)); |
| 636 | si->state = SI_ST_DIS; |
| 637 | si->exp = TICK_ETERNITY; |
| 638 | if (si->release) |
| 639 | si->release(si); |
| 640 | return; |
| 641 | } |
| 642 | |
Willy Tarreau | 5c979a9 | 2012-05-07 17:15:39 +0200 | [diff] [blame] | 643 | /* stream sock operations */ |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 644 | struct sock_ops sock_raw = { |
Willy Tarreau | 100c467 | 2012-08-20 12:06:26 +0200 | [diff] [blame] | 645 | .update = stream_int_update_conn, |
Willy Tarreau | 4a36b56 | 2012-08-06 19:31:45 +0200 | [diff] [blame] | 646 | .shutr = NULL, |
| 647 | .shutw = NULL, |
Willy Tarreau | 46a8d92 | 2012-08-20 12:38:36 +0200 | [diff] [blame] | 648 | .chk_rcv = stream_int_chk_rcv_conn, |
Willy Tarreau | de5722c | 2012-08-20 15:01:10 +0200 | [diff] [blame] | 649 | .chk_snd = stream_int_chk_snd_conn, |
Willy Tarreau | b277d6e | 2012-05-11 16:59:14 +0200 | [diff] [blame] | 650 | .read = sock_raw_read, |
Willy Tarreau | eecf6ca | 2012-08-20 15:09:53 +0200 | [diff] [blame^] | 651 | .write = si_conn_send_cb, |
Willy Tarreau | fae4499 | 2012-08-20 14:02:10 +0200 | [diff] [blame] | 652 | .snd_buf = sock_raw_write_loop, |
Willy Tarreau | 2420827 | 2012-05-21 17:28:50 +0200 | [diff] [blame] | 653 | .close = NULL, |
Willy Tarreau | 5c979a9 | 2012-05-07 17:15:39 +0200 | [diff] [blame] | 654 | }; |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 655 | |
| 656 | /* |
| 657 | * Local variables: |
| 658 | * c-indent-level: 8 |
| 659 | * c-basic-offset: 8 |
| 660 | * End: |
| 661 | */ |