2
* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
4
* This program is free software; you can redistribute it and/or
5
* modify it under the terms of the GNU General Public License as
6
* published by the Free Software Foundation; either version 2 of the
7
* License, or any later version.
9
* This program is distributed in the hope that it will be useful, but
10
* WITHOUT ANY WARRANTY; without even the implied warranty of
11
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12
* General Public License for more details.
14
* You should have received a copy of the GNU General Public License
15
* along with this program; if not, write to the Free Software
16
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19
* You can also choose to distribute this program under the terms of
20
* the Unmodified Binary Distribution Licence (as given in the file
21
* COPYING.UBDL), provided that you have satisfied its requirements.
24
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
29
#include <ipxe/refcnt.h>
30
#include <ipxe/interface.h>
32
#include <ipxe/xfer.h>
33
#include <ipxe/iobuf.h>
34
#include <ipxe/open.h>
35
#include <ipxe/socket.h>
36
#include <ipxe/retry.h>
37
#include <ipxe/pinger.h>
45
/* Disambiguate the various error causes */
46
#define EPROTO_LEN __einfo_error ( EINFO_EPROTO_LEN )
47
#define EINFO_EPROTO_LEN __einfo_uniqify ( EINFO_EPROTO, 0x01, \
48
"Incorrect reply length" )
49
#define EPROTO_DATA __einfo_error ( EINFO_EPROTO_DATA )
50
#define EINFO_EPROTO_DATA __einfo_uniqify ( EINFO_EPROTO, 0x02, \
51
"Incorrect reply data" )
52
#define EPROTO_SEQ __einfo_error ( EINFO_EPROTO_SEQ )
53
#define EINFO_EPROTO_SEQ __einfo_uniqify ( EINFO_EPROTO, 0x03, \
54
"Delayed or out-of-sequence reply" )
58
/** Reference count */
61
/** Job control interface */
63
/** Data transfer interface */
64
struct interface xfer;
67
struct retry_timer timer;
69
unsigned long timeout;
73
/** Current sequence number */
75
/** Response for current sequence number is still pending */
77
/** Number of remaining expiry events (zero to continue indefinitely) */
78
unsigned int remaining;
84
* @v src Source socket address, or NULL
85
* @v sequence Sequence number
86
* @v len Payload length
89
void ( * callback ) ( struct sockaddr *src, unsigned int sequence,
99
static void pinger_generate ( struct pinger *pinger, void *data ) {
100
uint8_t *bytes = data;
103
/* Generate byte sequence */
104
for ( i = 0 ; i < pinger->len ; i++ )
105
bytes[i] = ( i & 0xff );
112
* @v data Data buffer
113
* @ret rc Return status code
115
static int pinger_verify ( struct pinger *pinger, const void *data ) {
116
const uint8_t *bytes = data;
119
/* Check byte sequence */
120
for ( i = 0 ; i < pinger->len ; i++ ) {
121
if ( bytes[i] != ( i & 0xff ) )
132
* @v rc Reason for close
134
static void pinger_close ( struct pinger *pinger, int rc ) {
137
stop_timer ( &pinger->timer );
139
/* Shut down interfaces */
140
intf_shutdown ( &pinger->xfer, rc );
141
intf_shutdown ( &pinger->job, rc );
145
* Handle data transfer window change
149
static void pinger_window_changed ( struct pinger *pinger ) {
151
/* Do nothing if timer is already running */
152
if ( timer_running ( &pinger->timer ) )
155
/* Start timer when window opens for the first time */
156
if ( xfer_window ( &pinger->xfer ) )
157
start_timer_nodelay ( &pinger->timer );
161
* Handle timer expiry
164
* @v over Failure indicator
166
static void pinger_expired ( struct retry_timer *timer, int over __unused ) {
167
struct pinger *pinger = container_of ( timer, struct pinger, timer );
168
struct xfer_metadata meta;
169
struct io_buffer *iobuf;
172
/* If no response has been received, notify the callback function */
173
if ( pinger->pending && pinger->callback )
174
pinger->callback ( NULL, pinger->sequence, 0, -ETIMEDOUT );
176
/* Check for termination */
177
if ( pinger->remaining && ( --pinger->remaining == 0 ) ) {
178
pinger_close ( pinger, pinger->rc );
182
/* Increase sequence number */
185
/* Restart timer. Do this before attempting to transmit, in
186
* case the transmission attempt fails.
188
start_timer_fixed ( &pinger->timer, pinger->timeout );
191
/* Allocate I/O buffer */
192
iobuf = xfer_alloc_iob ( &pinger->xfer, pinger->len );
194
DBGC ( pinger, "PINGER %p could not allocate I/O buffer\n",
199
/* Generate payload */
200
pinger_generate ( pinger, iob_put ( iobuf, pinger->len ) );
202
/* Generate metadata */
203
memset ( &meta, 0, sizeof ( meta ) );
204
meta.flags = XFER_FL_ABS_OFFSET;
205
meta.offset = pinger->sequence;
207
/* Transmit packet */
208
if ( ( rc = xfer_deliver ( &pinger->xfer, iobuf, &meta ) ) != 0 ) {
209
DBGC ( pinger, "PINGER %p could not transmit: %s\n",
210
pinger, strerror ( rc ) );
216
* Handle received data
219
* @v iobuf I/O buffer
220
* @v meta Data transfer metadata
221
* @ret rc Return status code
223
static int pinger_deliver ( struct pinger *pinger, struct io_buffer *iobuf,
224
struct xfer_metadata *meta ) {
225
size_t len = iob_len ( iobuf );
226
uint16_t sequence = meta->offset;
230
/* Clear response pending flag, if applicable */
231
if ( sequence == pinger->sequence )
234
/* Check for errors */
235
if ( len != pinger->len ) {
236
/* Incorrect length: terminate immediately if we are
237
* not pinging indefinitely.
239
DBGC ( pinger, "PINGER %p received incorrect length %zd "
240
"(expected %zd)\n", pinger, len, pinger->len );
242
terminate = ( pinger->remaining != 0 );
243
} else if ( ( rc = pinger_verify ( pinger, iobuf->data ) ) != 0 ) {
244
/* Incorrect data: terminate immediately if we are not
245
* pinging indefinitely.
247
DBGC ( pinger, "PINGER %p received incorrect data:\n", pinger );
248
DBGC_HDA ( pinger, 0, iobuf->data, iob_len ( iobuf ) );
249
terminate = ( pinger->remaining != 0 );
250
} else if ( sequence != pinger->sequence ) {
251
/* Incorrect sequence number (probably a delayed response):
252
* report via callback but otherwise ignore.
254
DBGC ( pinger, "PINGER %p received sequence %d (expected %d)\n",
255
pinger, sequence, pinger->sequence );
259
/* Success: record that a packet was successfully received,
260
* and terminate if we expect to send no further packets.
264
terminate = ( pinger->remaining == 1 );
267
/* Discard I/O buffer */
270
/* Notify callback function, if applicable */
271
if ( pinger->callback )
272
pinger->callback ( meta->src, sequence, len, rc );
274
/* Terminate if applicable */
276
pinger_close ( pinger, rc );
281
/** Pinger data transfer interface operations */
282
static struct interface_operation pinger_xfer_op[] = {
283
INTF_OP ( xfer_deliver, struct pinger *, pinger_deliver ),
284
INTF_OP ( xfer_window_changed, struct pinger *, pinger_window_changed ),
285
INTF_OP ( intf_close, struct pinger *, pinger_close ),
288
/** Pinger data transfer interface descriptor */
289
static struct interface_descriptor pinger_xfer_desc =
290
INTF_DESC ( struct pinger, xfer, pinger_xfer_op );
292
/** Pinger job control interface operations */
293
static struct interface_operation pinger_job_op[] = {
294
INTF_OP ( intf_close, struct pinger *, pinger_close ),
297
/** Pinger job control interface descriptor */
298
static struct interface_descriptor pinger_job_desc =
299
INTF_DESC ( struct pinger, job, pinger_job_op );
304
* @v job Job control interface
305
* @v hostname Hostname to ping
306
* @v timeout Timeout (in ticks)
307
* @v len Payload length
308
* @v count Number of packets to send (or zero for no limit)
309
* @v callback Callback function (or NULL)
310
* @ret rc Return status code
312
int create_pinger ( struct interface *job, const char *hostname,
313
unsigned long timeout, size_t len, unsigned int count,
314
void ( * callback ) ( struct sockaddr *src,
315
unsigned int sequence, size_t len,
317
struct pinger *pinger;
324
/* Allocate and initialise structure */
325
pinger = zalloc ( sizeof ( *pinger ) );
328
ref_init ( &pinger->refcnt, NULL );
329
intf_init ( &pinger->job, &pinger_job_desc, &pinger->refcnt );
330
intf_init ( &pinger->xfer, &pinger_xfer_desc, &pinger->refcnt );
331
timer_init ( &pinger->timer, pinger_expired, &pinger->refcnt );
332
pinger->timeout = timeout;
334
pinger->remaining = ( count ? ( count + 1 /* Initial packet */ ) : 0 );
335
pinger->callback = callback;
336
pinger->rc = -ETIMEDOUT;
339
if ( ( rc = xfer_open_named_socket ( &pinger->xfer, SOCK_ECHO, NULL,
340
hostname, NULL ) ) != 0 ) {
341
DBGC ( pinger, "PINGER %p could not open socket: %s\n",
342
pinger, strerror ( rc ) );
346
/* Attach parent interface, mortalise self, and return */
347
intf_plug_plug ( &pinger->job, job );
348
ref_put ( &pinger->refcnt );
352
pinger_close ( pinger, rc );
353
ref_put ( &pinger->refcnt );