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
20 FILE_LICENCE ( GPL2_OR_LATER );
25 #include <ipxe/refcnt.h>
26 #include <ipxe/interface.h>
28 #include <ipxe/xfer.h>
29 #include <ipxe/iobuf.h>
30 #include <ipxe/open.h>
31 #include <ipxe/socket.h>
32 #include <ipxe/retry.h>
33 #include <ipxe/pinger.h>
41 /* Disambiguate the various error causes */
42 #define EPROTO_LEN __einfo_error ( EINFO_EPROTO_LEN )
43 #define EINFO_EPROTO_LEN __einfo_uniqify ( EINFO_EPROTO, 0x01, \
44 "Incorrect reply length" )
45 #define EPROTO_DATA __einfo_error ( EINFO_EPROTO_DATA )
46 #define EINFO_EPROTO_DATA __einfo_uniqify ( EINFO_EPROTO, 0x02, \
47 "Incorrect reply data" )
48 #define EPROTO_SEQ __einfo_error ( EINFO_EPROTO_SEQ )
49 #define EINFO_EPROTO_SEQ __einfo_uniqify ( EINFO_EPROTO, 0x03, \
50 "Delayed or out-of-sequence reply" )
54 /** Reference count */
57 /** Job control interface */
59 /** Data transfer interface */
60 struct interface xfer;
63 struct retry_timer timer;
65 unsigned long timeout;
69 /** Current sequence number */
71 /** Response for current sequence number is still pending */
73 /** Number of remaining expiry events (zero to continue indefinitely) */
74 unsigned int remaining;
80 * @v src Source socket address, or NULL
81 * @v sequence Sequence number
82 * @v len Payload length
85 void ( * callback ) ( struct sockaddr *src, unsigned int sequence,
95 static void pinger_generate ( struct pinger *pinger, void *data ) {
96 uint8_t *bytes = data;
99 /* Generate byte sequence */
100 for ( i = 0 ; i < pinger->len ; i++ )
101 bytes[i] = ( i & 0xff );
108 * @v data Data buffer
109 * @ret rc Return status code
111 static int pinger_verify ( struct pinger *pinger, const void *data ) {
112 const uint8_t *bytes = data;
115 /* Check byte sequence */
116 for ( i = 0 ; i < pinger->len ; i++ ) {
117 if ( bytes[i] != ( i & 0xff ) )
128 * @v rc Reason for close
130 static void pinger_close ( struct pinger *pinger, int rc ) {
133 stop_timer ( &pinger->timer );
135 /* Shut down interfaces */
136 intf_shutdown ( &pinger->xfer, rc );
137 intf_shutdown ( &pinger->job, rc );
141 * Handle data transfer window change
145 static void pinger_window_changed ( struct pinger *pinger ) {
147 /* Do nothing if timer is already running */
148 if ( timer_running ( &pinger->timer ) )
151 /* Start timer when window opens for the first time */
152 if ( xfer_window ( &pinger->xfer ) )
153 start_timer_nodelay ( &pinger->timer );
157 * Handle timer expiry
160 * @v over Failure indicator
162 static void pinger_expired ( struct retry_timer *timer, int over __unused ) {
163 struct pinger *pinger = container_of ( timer, struct pinger, timer );
164 struct xfer_metadata meta;
165 struct io_buffer *iobuf;
168 /* If no response has been received, notify the callback function */
169 if ( pinger->pending && pinger->callback )
170 pinger->callback ( NULL, pinger->sequence, 0, -ETIMEDOUT );
172 /* Check for termination */
173 if ( pinger->remaining && ( --pinger->remaining == 0 ) ) {
174 pinger_close ( pinger, pinger->rc );
178 /* Increase sequence number */
181 /* Restart timer. Do this before attempting to transmit, in
182 * case the transmission attempt fails.
184 start_timer_fixed ( &pinger->timer, pinger->timeout );
187 /* Allocate I/O buffer */
188 iobuf = xfer_alloc_iob ( &pinger->xfer, pinger->len );
190 DBGC ( pinger, "PINGER %p could not allocate I/O buffer\n",
195 /* Generate payload */
196 pinger_generate ( pinger, iob_put ( iobuf, pinger->len ) );
198 /* Generate metadata */
199 memset ( &meta, 0, sizeof ( meta ) );
200 meta.flags = XFER_FL_ABS_OFFSET;
201 meta.offset = pinger->sequence;
203 /* Transmit packet */
204 if ( ( rc = xfer_deliver ( &pinger->xfer, iobuf, &meta ) ) != 0 ) {
205 DBGC ( pinger, "PINGER %p could not transmit: %s\n",
206 pinger, strerror ( rc ) );
212 * Handle received data
215 * @v iobuf I/O buffer
216 * @v meta Data transfer metadata
217 * @ret rc Return status code
219 static int pinger_deliver ( struct pinger *pinger, struct io_buffer *iobuf,
220 struct xfer_metadata *meta ) {
221 size_t len = iob_len ( iobuf );
222 uint16_t sequence = meta->offset;
226 /* Clear response pending flag, if applicable */
227 if ( sequence == pinger->sequence )
230 /* Check for errors */
231 if ( len != pinger->len ) {
232 /* Incorrect length: terminate immediately if we are
233 * not pinging indefinitely.
235 DBGC ( pinger, "PINGER %p received incorrect length %zd "
236 "(expected %zd)\n", pinger, len, pinger->len );
238 terminate = ( pinger->remaining != 0 );
239 } else if ( ( rc = pinger_verify ( pinger, iobuf->data ) ) != 0 ) {
240 /* Incorrect data: terminate immediately if we are not
241 * pinging indefinitely.
243 DBGC ( pinger, "PINGER %p received incorrect data:\n", pinger );
244 DBGC_HDA ( pinger, 0, iobuf->data, iob_len ( iobuf ) );
245 terminate = ( pinger->remaining != 0 );
246 } else if ( sequence != pinger->sequence ) {
247 /* Incorrect sequence number (probably a delayed response):
248 * report via callback but otherwise ignore.
250 DBGC ( pinger, "PINGER %p received sequence %d (expected %d)\n",
251 pinger, sequence, pinger->sequence );
255 /* Success: record that a packet was successfully received,
256 * and terminate if we expect to send no further packets.
260 terminate = ( pinger->remaining == 1 );
263 /* Discard I/O buffer */
266 /* Notify callback function, if applicable */
267 if ( pinger->callback )
268 pinger->callback ( meta->src, sequence, len, rc );
270 /* Terminate if applicable */
272 pinger_close ( pinger, rc );
277 /** Pinger data transfer interface operations */
278 static struct interface_operation pinger_xfer_op[] = {
279 INTF_OP ( xfer_deliver, struct pinger *, pinger_deliver ),
280 INTF_OP ( xfer_window_changed, struct pinger *, pinger_window_changed ),
281 INTF_OP ( intf_close, struct pinger *, pinger_close ),
284 /** Pinger data transfer interface descriptor */
285 static struct interface_descriptor pinger_xfer_desc =
286 INTF_DESC ( struct pinger, xfer, pinger_xfer_op );
288 /** Pinger job control interface operations */
289 static struct interface_operation pinger_job_op[] = {
290 INTF_OP ( intf_close, struct pinger *, pinger_close ),
293 /** Pinger job control interface descriptor */
294 static struct interface_descriptor pinger_job_desc =
295 INTF_DESC ( struct pinger, job, pinger_job_op );
300 * @v job Job control interface
301 * @v hostname Hostname to ping
302 * @v timeout Timeout (in ticks)
303 * @v len Payload length
304 * @v count Number of packets to send (or zero for no limit)
305 * @v callback Callback function (or NULL)
306 * @ret rc Return status code
308 int create_pinger ( struct interface *job, const char *hostname,
309 unsigned long timeout, size_t len, unsigned int count,
310 void ( * callback ) ( struct sockaddr *src,
311 unsigned int sequence, size_t len,
313 struct pinger *pinger;
320 /* Allocate and initialise structure */
321 pinger = zalloc ( sizeof ( *pinger ) );
324 ref_init ( &pinger->refcnt, NULL );
325 intf_init ( &pinger->job, &pinger_job_desc, &pinger->refcnt );
326 intf_init ( &pinger->xfer, &pinger_xfer_desc, &pinger->refcnt );
327 timer_init ( &pinger->timer, pinger_expired, &pinger->refcnt );
328 pinger->timeout = timeout;
330 pinger->remaining = ( count ? ( count + 1 /* Initial packet */ ) : 0 );
331 pinger->callback = callback;
332 pinger->rc = -ETIMEDOUT;
335 if ( ( rc = xfer_open_named_socket ( &pinger->xfer, SOCK_ECHO, NULL,
336 hostname, NULL ) ) != 0 ) {
337 DBGC ( pinger, "PINGER %p could not open socket: %s\n",
338 pinger, strerror ( rc ) );
342 /* Attach parent interface, mortalise self, and return */
343 intf_plug_plug ( &pinger->job, job );
344 ref_put ( &pinger->refcnt );
348 pinger_close ( pinger, rc );
349 ref_put ( &pinger->refcnt );