2 * Copyright (c) 2005-2007 Daniel Braniss <danny@cs.huji.ac.il>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 | $Id: fsm.c,v 2.8 2007/05/19 16:34:21 danny Exp danny $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <sys/sysctl.h>
40 #include <netinet/in.h>
41 #include <netinet/tcp.h>
42 #include <arpa/inet.h>
43 #if __FreeBSD_version < 500000
46 #include <sys/ioctl.h>
60 #include "iscontrol.h"
65 T2, /*T3,*/ T4, T5, /*T6,*/ T7, T8, T9,
66 T10, T11, T12, T13, T14, T15, T16, T18
70 tcpConnect(isess_t *sess)
72 isc_opt_t *op = sess->op;
74 struct addrinfo *res, hints;
75 struct sockaddr_in sn;
80 if(sess->flags & (SESS_RECONNECT|SESS_REDIRECT)) {
81 syslog(LOG_INFO, "%s", (sess->flags & SESS_RECONNECT)
82 ? "Reconnect": "Redirected");
84 debug(3, "%s", (sess->flags & SESS_RECONNECT) ? "Reconnect": "Redirected");
85 shutdown(sess->soc, SHUT_RDWR);
87 sleep(5); // XXX: actually should be ?
90 sess->flags &= ~SESS_CONNECTED;
91 if(sess->flags & SESS_REDIRECT) {
92 if(sess->redirect_cnt++ > MAXREDIRECTS) {
93 syslog(LOG_WARNING, "too many redirects > %d", MAXREDIRECTS);
96 sess->flags |= SESS_RECONNECT;
98 if((sess->flags & SESS_RECONNECT) == 0)
101 // make sure we are not in a loop
102 // XXX: this code has to be tested
103 sec = time(0) - sess->reconnect_time;
105 // if we've been connected for more that 5 minutes
106 // then just reconnect
107 sess->reconnect_time = sec;
108 sess->reconnect_cnt1 = 0;
112 sess->reconnect_cnt1++;
113 if((sec / sess->reconnect_cnt1) < 2) {
114 // if less that 2 seconds from the last reconnect
115 // we are most probably looping
116 syslog(LOG_CRIT, "too many reconnects %d", sess->reconnect_cnt1);
120 sess->reconnect_cnt++;
121 // sess->flags &= ~(SESS_RECONNECT|SESS_REDIRECT);
124 if((sess->soc = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
125 fprintf(stderr, "tcpConnect: socket: %m");
129 memset(&hints, 0, sizeof(hints));
130 hints.ai_family = PF_INET;
131 hints.ai_socktype = SOCK_STREAM;
133 debug(3, "targetAddress=%s port=%d", op->targetAddress, op->port);
134 if(inet_aton(op->targetAddress, &ipn))
135 hints.ai_flags |= AI_NUMERICHOST;
136 if((val = getaddrinfo(op->targetAddress, NULL, &hints, &res)) != 0) {
137 fprintf(stderr, "getaddrinfo(%s): %s\n", op->targetAddress, gai_strerror(val));
140 memcpy(&sn, res->ai_addr, sizeof(struct sockaddr_in));
141 sn.sin_port = htons(op->port);
144 // from Patrick.Guelat@imp.ch:
145 // iscontrol can be called without waiting for the socket entry to time out
147 if(setsockopt(sess->soc, SOL_SOCKET, SO_REUSEADDR, &val, (socklen_t)sizeof(val)) < 0) {
148 fprintf(stderr, "Cannot set socket SO_REUSEADDR %d: %s\n\n",
149 errno, strerror(errno));
152 sess->flags &= ~SESS_CONNECTED;
154 if(connect(sess->soc, (struct sockaddr *)&sn, sizeof(struct sockaddr_in)) != -1) {
156 struct timeval timeout;
159 if(setsockopt(sess->soc, IPPROTO_TCP, TCP_KEEPALIVE, &val, sizeof(val)) < 0)
160 fprintf(stderr, "Cannot set socket KEEPALIVE option err=%d %s\n",
161 errno, strerror(errno));
163 if(setsockopt(sess->soc, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) < 0)
164 fprintf(stderr, "Cannot set socket NO delay option err=%d %s\n",
165 errno, strerror(errno));
169 if((setsockopt(sess->soc, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) < 0)
170 || (setsockopt(sess->soc, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) < 0)) {
171 fprintf(stderr, "Cannot set socket timeout to %ld err=%d %s\n",
172 timeout.tv_sec, errno, strerror(errno));
177 int len = sizeof(val);
178 if(getsockopt(sess->soc, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0)
179 fprintf(stderr, "was: SO_SNDBUF=%dK\n", val/1024);
182 if(sess->op->sockbufsize) {
183 val = sess->op->sockbufsize * 1024;
184 if((setsockopt(sess->soc, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) < 0)
185 || (setsockopt(sess->soc, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)) < 0)) {
186 fprintf(stderr, "Cannot set socket sndbuf & rcvbuf to %d err=%d %s\n",
187 val, errno, strerror(errno));
191 sess->flags |= SESS_CONNECTED;
196 fprintf(stderr, "errno=%d\n", sv_errno);
202 sleep(5); // for now ...
205 return 0; // terminal error
211 setOptions(isess_t *sess, int flag)
218 bzero(&oop, sizeof(isc_opt_t));
220 if((flag & SESS_FULLFEATURE) == 0) {
221 oop.initiatorName = sess->op->initiatorName;
222 oop.targetAddress = sess->op->targetAddress;
223 if(sess->op->targetName != 0)
224 oop.targetName = sess->op->targetName;
226 oop.maxRecvDataSegmentLength = sess->op->maxRecvDataSegmentLength;
227 oop.maxXmitDataSegmentLength = sess->op->maxXmitDataSegmentLength; // XXX:
228 oop.maxBurstLength = sess->op->maxBurstLength;
229 oop.maxluns = sess->op->maxluns;
233 | turn on digestion only after login
235 if(sess->op->headerDigest != NULL) {
236 sep = strchr(sess->op->headerDigest, ',');
238 oop.headerDigest = sess->op->headerDigest;
239 debug(1, "oop.headerDigest=%s", oop.headerDigest);
241 if(sess->op->dataDigest != NULL) {
242 sep = strchr(sess->op->dataDigest, ',');
244 oop.dataDigest = sess->op->dataDigest;
245 debug(1, "oop.dataDigest=%s", oop.dataDigest);
249 if(ioctl(sess->fd, ISCSISETOPT, &oop)) {
250 perror("ISCSISETOPT");
257 startSession(isess_t *sess)
265 if((sess->flags & SESS_CONNECTED) == 0) {
269 fd = open(iscsidev, O_RDWR);
275 // XXX: this has to go
277 n = sizeof(sess->isid);
278 if(sysctlbyname("net.iscsi.isid", (void *)sess->isid, (size_t *)&n, 0, 0) != 0)
279 perror("sysctlbyname");
281 if(ioctl(fd, ISCSISETSES, &n)) {
282 perror("ISCSISETSES");
285 asprintf(&dev, "%s%d", iscsidev, n);
286 nfd = open(dev, O_RDWR);
296 if(setOptions(sess, 0) != 0)
300 if(ioctl(sess->fd, ISCSISETSOC, &sess->soc)) {
301 perror("ISCSISETSOC");
313 syslog(LOG_NOTICE, "trapped signal %d", sig);
314 fprintf(stderr, "trapped signal %d\n", sig);
318 currsess->flags |= SESS_DISCONNECT;
322 currsess->flags |= SESS_RECONNECT;
339 if(ioctl(sess->fd, ISCSIGETCAM, &sess->cam) != 0) {
340 syslog(LOG_WARNING, "ISCSIGETCAM failed: %d", errno);
343 debug(2, "nluns=%d", sess->cam.target_nluns);
345 | for now will do this for each lun ...
347 for(i = 0; i < sess->cam.target_nluns; i++) {
348 debug(2, "CAM path_id=%d target_id=%d target_lun=%d",
349 sess->cam.path_id, sess->cam.target_id, sess->cam.target_lun[i]);
351 sess->camdev = cam_open_btl(sess->cam.path_id, sess->cam.target_id,
352 sess->cam.target_lun[i], O_RDWR, NULL);
353 if(sess->camdev == NULL) {
354 syslog(LOG_WARNING, "%s", cam_errbuf);
355 debug(3, "%s", cam_errbuf);
359 cam_path_string(sess->camdev, pathstr, sizeof(pathstr));
360 debug(2, "pathstr=%s", pathstr);
362 ccb = cam_getccb(sess->camdev);
363 bzero(&(&ccb->ccb_h)[1], sizeof(struct ccb_relsim) - sizeof(struct ccb_hdr));
364 ccb->ccb_h.func_code = XPT_REL_SIMQ;
365 ccb->crs.release_flags = RELSIM_ADJUST_OPENINGS;
366 ccb->crs.openings = sess->op->tags;
368 if(cam_send_ccb(sess->camdev, ccb) < 0)
369 syslog(LOG_WARNING, "%s", cam_errbuf);
371 if((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
372 syslog(LOG_WARNING, "XPT_REL_SIMQ CCB failed");
373 // cam_error_print(sess->camdev, ccb, CAM_ESF_ALL, CAM_EPF_ALL, stderr);
376 syslog(LOG_INFO, "%s tagged openings now %d\n", pathstr, ccb->crs.openings);
379 cam_close_device(sess->camdev);
384 supervise(isess_t *sess)
390 if(strcmp(sess->op->sessionType, "Discovery") == 0) {
391 sess->flags |= SESS_DISCONNECT;
396 printf("ready to go scsi\n");
398 if(setOptions(sess, SESS_FULLFEATURE) != 0)
401 if((sess->flags & SESS_FULLFEATURE) == 0) {
402 if(daemon(0, 1) != 0) {
407 openlog("iscontrol", LOG_CONS|LOG_PERROR|LOG_PID|LOG_NDELAY, LOG_KERN);
408 syslog(LOG_INFO, "running");
411 if(ioctl(sess->fd, ISCSISTART)) {
412 perror("ISCSISTART");
420 if(ioctl(sess->fd, ISCSIRESTART)) {
421 perror("ISCSIRESTART");
426 signal(SIGINT, trap);
427 signal(SIGHUP, trap);
428 signal(SIGTERM, trap);
432 if(ioctl(sess->fd, ISCSISIGNAL, &sig)) {
433 perror("ISCSISIGNAL");
436 sess->flags |= SESS_FULLFEATURE;
438 sess->flags &= ~(SESS_REDIRECT | SESS_RECONNECT);
439 printf("iscontrol: supervise starting main loop\n");
441 | the main loop - actually do nothing
442 | all the work is done inside the kernel
444 while((sess->flags & (SESS_REDIRECT|SESS_RECONNECT|SESS_DISCONNECT)) == 0) {
446 // like sending a nop_out?
449 printf("iscontrol: supervise going down\n");
450 syslog(LOG_INFO, "sess flags=%x", sess->flags);
453 if(ioctl(sess->fd, ISCSISIGNAL, &sig)) {
454 perror("ISCSISIGNAL");
457 if(sess->flags & SESS_DISCONNECT) {
459 if(ioctl(sess->fd, ISCSISTOP, &val)) {
462 sess->flags &= ~SESS_FULLFEATURE;
466 sess->flags |= SESS_INITIALLOGIN1;
472 handledDiscoveryResp(isess_t *sess, pdu_t *pp)
484 n = strlen((char *)ptr) + 1;
492 doDiscovery(isess_t *sess)
495 text_req_t *tp = (text_req_t *)&spp.ipdu.bhs;
499 bzero(&spp, sizeof(pdu_t));
500 tp->cmd = ISCSI_TEXT_CMD /*| 0x40 */; // because of a bug in openiscsi-target
502 tp->ttt = 0xffffffff;
503 addText(&spp, "SendTargets=All");
504 return sendPDU(sess, &spp, handledDiscoveryResp);
508 doLogin(isess_t *sess)
510 isc_opt_t *op = sess->op;
515 if(op->chapSecret == NULL && op->tgtChapSecret == NULL)
517 | don't need any security negotiation
518 | or in other words: we don't have any secrets to exchange
520 sess->csg = LON_PHASE;
522 sess->csg = SN_PHASE;
525 sess->tsih = 0; // XXX: no 'reconnect' yet
526 sess->flags &= ~SESS_NEGODONE; // XXX: KLUDGE
528 count = 10; // should be more than enough
530 debug(3, "count=%d csg=%d", count, sess->csg);
531 status = loginPhase(sess);
533 // just in case we get into a loop
535 } while(status == 0 && (sess->csg != FF_PHASE));
537 sess->flags &= ~SESS_INITIALLOGIN;
538 debug(3, "status=%d", status);
541 case 0: // all is ok ...
542 sess->flags |= SESS_LOGGEDIN;
543 if(strcmp(sess->op->sessionType, "Discovery") == 0)
547 case 1: // redirect - temporary/permanent
549 | start from scratch?
551 sess->flags &= ~SESS_NEGODONE;
552 sess->flags |= (SESS_REDIRECT | SESS_INITIALLOGIN1);
553 syslog(LOG_DEBUG, "target sent REDIRECT");
556 case 2: // initiator terminal error
557 case 3: // target terminal error -- could retry ...
564 handleLogoutResp(isess_t *sess, pdu_t *pp)
566 if(sess->flags & SESS_DISCONNECT)
572 startLogout(isess_t *sess)
575 logout_req_t *p = (logout_req_t *)&spp.ipdu.bhs;
577 bzero(&spp, sizeof(pdu_t));
578 p->cmd = ISCSI_LOGOUT_CMD| 0x40;
579 p->reason = BIT(7) | 0;
582 return sendPDU(sess, &spp, handleLogoutResp);
586 inLogout(isess_t *sess)
588 if(sess->flags & SESS_RECONNECT)
594 S1, S2, /*S3,*/ S4, S5, S6, S7, S8
606 -------<-------------+
607 +--------->/ S1 \<----+ |
626 | | |T5 +--------+---------+
627 | | | /T16+-----+------+ |
628 | | | / -+-----+--+ | |
629 | | | / / S7 \ |T12| |
630 | | | / +->\ /<-+ V V
631 | | | / / -+----- -------
632 | | | / /T11 |T10 / S8 \
633 | | V / / V +----+ \ /
634 | | ---+-+- ----+-- | -------
635 | | / S5 \T9 / S6 \<+ ^
636 | +-----\ /--->\ / T14 |
637 | ------- --+----+------+T17
638 +---------------------------+
647 if((sess = calloc(1, sizeof(isess_t))) == NULL) {
648 // boy, is this a bad start ...
649 fprintf(stderr, "no memory!\n");
658 sess->flags = SESS_INITIALLOGIN | SESS_INITIALLOGIN1;
664 switch(tcpConnect(sess)) {
665 case T1: state = S2; break;
666 default: state = S8; break;
671 switch(startSession(sess)) {
672 case T2: state = S1; break;
673 case T4: state = S4; break;
674 default: state = S8; break;
679 switch(doLogin(sess)) {
680 case T7: state = S1; break;
681 case T5: state = S5; break;
682 default: state = S8; break;
687 switch(supervise(sess)) {
688 case T8: state = S1; break;
689 case T9: state = S6; break;
690 case T11: state = S7; break;
691 case T15: state = S8; break;
692 default: state = S8; break;
697 switch(startLogout(sess)) {
698 case T13: state = S1; break;
699 case T14: state = S6; break;
700 case T16: state = S8; break;
701 default: state = S8; break;
706 switch(inLogout(sess)) {
707 case T18: state = S1; break;
708 case T10: state = S6; break;
709 case T12: state = S7; break;
710 case T16: state = S8; break;
711 default: state = S8; break;
716 // maybe do some clean up?
717 syslog(LOG_INFO, "terminated");