2 * Copyright (c) 2005-2008 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/param.h>
33 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <sys/sysctl.h>
37 #include <netinet/in.h>
38 #include <netinet/tcp.h>
39 #include <arpa/inet.h>
40 #include <sys/ioctl.h>
54 #include "iscontrol.h"
58 T2, /*T3,*/ T4, T5, /*T6,*/ T7, T8, T9,
59 T10, T11, T12, T13, T14, T15, T16, T18
65 | Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
66 | ume@mahoroba.org ume@{,jp.}FreeBSD.org
67 | http://www.imasy.org/~ume/
70 tcpConnect(isess_t *sess)
72 isc_opt_t *op = sess->op;
73 int val, sv_errno, soc;
74 struct addrinfo *res, *res0, hints;
78 if(sess->flags & (SESS_RECONNECT|SESS_REDIRECT)) {
79 syslog(LOG_INFO, "%s", (sess->flags & SESS_RECONNECT)
80 ? "Reconnect": "Redirected");
82 debug(1, "%s", (sess->flags & SESS_RECONNECT) ? "Reconnect": "Redirected");
83 shutdown(sess->soc, SHUT_RDWR);
87 sess->flags &= ~SESS_CONNECTED;
88 if(sess->flags & SESS_REDIRECT) {
90 sess->flags |= SESS_RECONNECT;
92 sleep(2); // XXX: actually should be ?
96 // make sure we are not in a loop
97 // XXX: this code has to be tested
98 sec = time(0) - sess->reconnect_time;
100 // if we've been connected for more that 5 minutes
101 // then just reconnect
102 sess->reconnect_time = sec;
103 sess->reconnect_cnt1 = 0;
107 sess->reconnect_cnt1++;
108 if((sec / sess->reconnect_cnt1) < 2) {
109 // if less that 2 seconds from the last reconnect
110 // we are most probably looping
111 syslog(LOG_CRIT, "too many reconnects %d", sess->reconnect_cnt1);
117 sess->reconnect_cnt++;
120 snprintf(pbuf, sizeof(pbuf), "%d", op->port);
121 memset(&hints, 0, sizeof(hints));
122 hints.ai_family = PF_UNSPEC;
123 hints.ai_socktype = SOCK_STREAM;
124 debug(1, "targetAddress=%s port=%d", op->targetAddress, op->port);
125 if((val = getaddrinfo(op->targetAddress, pbuf, &hints, &res0)) != 0) {
126 fprintf(stderr, "getaddrinfo(%s): %s\n", op->targetAddress, gai_strerror(val));
129 sess->flags &= ~SESS_CONNECTED;
132 for(res = res0; res; res = res->ai_next) {
133 soc = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
137 // from Patrick.Guelat@imp.ch:
138 // iscontrol can be called without waiting for the socket entry to time out
140 if(setsockopt(soc, SOL_SOCKET, SO_REUSEADDR, &val, (socklen_t)sizeof(val)) < 0) {
141 fprintf(stderr, "Cannot set socket SO_REUSEADDR %d: %s\n\n",
142 errno, strerror(errno));
144 if(connect(soc, res->ai_addr, res->ai_addrlen) == 0)
156 /* Default to TCP_NODELAY to improve transfers */
157 if(setsockopt(sess->soc, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) < 0)
158 fprintf(stderr, "Cannot set socket NO delay option err=%d %s\n",
159 errno, strerror(errno));
162 struct timeval timeout;
165 if(setsockopt(sess->soc, IPPROTO_TCP, TCP_KEEPALIVE, &val, sizeof(val)) < 0)
166 fprintf(stderr, "Cannot set socket KEEPALIVE option err=%d %s\n",
167 errno, strerror(errno));
169 if(setsockopt(sess->soc, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) < 0)
170 fprintf(stderr, "Cannot set socket NO delay option err=%d %s\n",
171 errno, strerror(errno));
175 if((setsockopt(sess->soc, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) < 0)
176 || (setsockopt(sess->soc, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) < 0)) {
177 fprintf(stderr, "Cannot set socket timeout to %ld err=%d %s\n",
178 timeout.tv_sec, errno, strerror(errno));
183 int len = sizeof(val);
184 if(getsockopt(sess->soc, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0)
185 fprintf(stderr, "was: SO_SNDBUF=%dK\n", val/1024);
188 if(sess->op->sockbufsize) {
189 val = sess->op->sockbufsize * 1024;
190 if((setsockopt(sess->soc, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) < 0)
191 || (setsockopt(sess->soc, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)) < 0)) {
192 fprintf(stderr, "Cannot set socket sndbuf & rcvbuf to %d err=%d %s\n",
193 val, errno, strerror(errno));
197 sess->flags |= SESS_CONNECTED;
201 fprintf(stderr, "errno=%d\n", sv_errno);
207 if((sess->flags & SESS_REDIRECT) == 0) {
208 if(strcmp(op->targetAddress, sess->target.address) != 0) {
209 syslog(LOG_INFO, "reconnecting to original target address");
210 free(op->targetAddress);
211 op->targetAddress = sess->target.address;
212 op->port = sess->target.port;
213 op->targetPortalGroupTag = sess->target.pgt;
217 sleep(5); // for now ...
220 return 0; // terminal error
225 setOptions(isess_t *sess, int flag)
232 bzero(&oop, sizeof(isc_opt_t));
234 if((flag & SESS_FULLFEATURE) == 0) {
235 oop.initiatorName = sess->op->initiatorName;
236 oop.targetAddress = sess->op->targetAddress;
237 if(sess->op->targetName != 0)
238 oop.targetName = sess->op->targetName;
240 oop.maxRecvDataSegmentLength = sess->op->maxRecvDataSegmentLength;
241 oop.maxXmitDataSegmentLength = sess->op->maxXmitDataSegmentLength; // XXX:
242 oop.maxBurstLength = sess->op->maxBurstLength;
243 oop.maxluns = sess->op->maxluns;
247 | turn on digestion only after login
249 if(sess->op->headerDigest != NULL) {
250 sep = strchr(sess->op->headerDigest, ',');
252 oop.headerDigest = sess->op->headerDigest;
253 debug(1, "oop.headerDigest=%s", oop.headerDigest);
255 if(sess->op->dataDigest != NULL) {
256 sep = strchr(sess->op->dataDigest, ',');
258 oop.dataDigest = sess->op->dataDigest;
259 debug(1, "oop.dataDigest=%s", oop.dataDigest);
263 if(ioctl(sess->fd, ISCSISETOPT, &oop)) {
264 perror("ISCSISETOPT");
271 startSession(isess_t *sess)
279 if((sess->flags & SESS_CONNECTED) == 0) {
283 fd = open(iscsidev, O_RDWR);
289 // XXX: this has to go
291 n = sizeof(sess->isid);
292 if(sysctlbyname("net.iscsi.isid", (void *)sess->isid, (size_t *)&n, 0, 0) != 0)
293 perror("sysctlbyname");
295 if(ioctl(fd, ISCSISETSES, &n)) {
296 perror("ISCSISETSES");
299 sleep(1); /* XXX temporary */
300 asprintf(&dev, "%s%d", iscsidev, n);
301 nfd = open(dev, O_RDWR);
311 if(setOptions(sess, 0) != 0)
315 if(ioctl(sess->fd, ISCSISETSOC, &sess->soc)) {
316 perror("ISCSISETSOC");
328 syslog(LOG_NOTICE, "trapped signal %d", sig);
329 fprintf(stderr, "trapped signal %d\n", sig);
333 currsess->flags |= SESS_DISCONNECT;
337 currsess->flags |= SESS_RECONNECT;
354 if(ioctl(sess->fd, ISCSIGETCAM, &sess->cam) != 0) {
355 syslog(LOG_WARNING, "ISCSIGETCAM failed: %d", errno);
358 debug(2, "nluns=%d", sess->cam.target_nluns);
360 | for now will do this for each lun ...
362 for(i = 0; i < sess->cam.target_nluns; i++) {
363 debug(2, "CAM path_id=%d target_id=%d target_lun=%d",
364 sess->cam.path_id, sess->cam.target_id, sess->cam.target_lun[i]);
366 sess->camdev = cam_open_btl(sess->cam.path_id, sess->cam.target_id,
367 sess->cam.target_lun[i], O_RDWR, NULL);
368 if(sess->camdev == NULL) {
369 syslog(LOG_WARNING, "%s", cam_errbuf);
370 debug(3, "%s", cam_errbuf);
374 cam_path_string(sess->camdev, pathstr, sizeof(pathstr));
375 debug(2, "pathstr=%s", pathstr);
377 ccb = cam_getccb(sess->camdev);
378 bzero(&(&ccb->ccb_h)[1], sizeof(struct ccb_relsim) - sizeof(struct ccb_hdr));
379 ccb->ccb_h.func_code = XPT_REL_SIMQ;
380 ccb->crs.release_flags = RELSIM_ADJUST_OPENINGS;
381 ccb->crs.openings = sess->op->tags;
383 if(cam_send_ccb(sess->camdev, ccb) < 0)
384 syslog(LOG_WARNING, "%s", cam_errbuf);
386 if((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
387 syslog(LOG_WARNING, "XPT_REL_SIMQ CCB failed");
388 // cam_error_print(sess->camdev, ccb, CAM_ESF_ALL, CAM_EPF_ALL, stderr);
391 syslog(LOG_INFO, "%s tagged openings now %d\n", pathstr, ccb->crs.openings);
394 cam_close_device(sess->camdev);
399 supervise(isess_t *sess)
405 if(strcmp(sess->op->sessionType, "Discovery") == 0) {
406 sess->flags |= SESS_DISCONNECT;
411 printf("ready to go scsi\n");
413 if(setOptions(sess, SESS_FULLFEATURE) != 0)
416 if((sess->flags & SESS_FULLFEATURE) == 0) {
417 if(daemon(0, 1) != 0) {
422 openlog("iscontrol", LOG_CONS|LOG_PERROR|LOG_PID|LOG_NDELAY, LOG_KERN);
423 syslog(LOG_INFO, "running");
426 if(ioctl(sess->fd, ISCSISTART)) {
427 perror("ISCSISTART");
434 if(ioctl(sess->fd, ISCSIRESTART)) {
435 perror("ISCSIRESTART");
440 signal(SIGINT, trap);
441 signal(SIGHUP, trap);
442 signal(SIGTERM, trap);
446 if(ioctl(sess->fd, ISCSISIGNAL, &sig)) {
447 perror("ISCSISIGNAL");
450 sess->flags |= SESS_FULLFEATURE;
452 sess->flags &= ~(SESS_REDIRECT | SESS_RECONNECT);
453 printf("iscontrol: supervise starting main loop\n");
455 | the main loop - actually do nothing
456 | all the work is done inside the kernel
458 while((sess->flags & (SESS_REDIRECT|SESS_RECONNECT|SESS_DISCONNECT)) == 0) {
460 // like sending a nop_out?
463 printf("iscontrol: supervise going down\n");
464 syslog(LOG_INFO, "sess flags=%x", sess->flags);
467 if(ioctl(sess->fd, ISCSISIGNAL, &sig)) {
468 perror("ISCSISIGNAL");
471 if(sess->flags & SESS_DISCONNECT) {
473 if(ioctl(sess->fd, ISCSISTOP, &val)) {
476 sess->flags &= ~SESS_FULLFEATURE;
480 sess->flags |= SESS_INITIALLOGIN1;
486 handledDiscoveryResp(isess_t *sess, pdu_t *pp)
498 n = strlen((char *)ptr) + 1;
506 doDiscovery(isess_t *sess)
509 text_req_t *tp = (text_req_t *)&spp.ipdu.bhs;
513 bzero(&spp, sizeof(pdu_t));
514 tp->cmd = ISCSI_TEXT_CMD /*| 0x40 */; // because of a bug in openiscsi-target
516 tp->ttt = 0xffffffff;
517 addText(&spp, "SendTargets=All");
518 return sendPDU(sess, &spp, handledDiscoveryResp);
522 doLogin(isess_t *sess)
524 isc_opt_t *op = sess->op;
529 if(op->chapSecret == NULL && op->tgtChapSecret == NULL)
531 | don't need any security negotiation
532 | or in other words: we don't have any secrets to exchange
534 sess->csg = LON_PHASE;
536 sess->csg = SN_PHASE;
539 sess->tsih = 0; // XXX: no 'reconnect' yet
540 sess->flags &= ~SESS_NEGODONE; // XXX: KLUDGE
542 count = 10; // should be more than enough
544 debug(3, "count=%d csg=%d", count, sess->csg);
545 status = loginPhase(sess);
547 // just in case we get into a loop
549 } while(status == 0 && (sess->csg != FF_PHASE));
551 sess->flags &= ~SESS_INITIALLOGIN;
552 debug(3, "status=%d", status);
555 case 0: // all is ok ...
556 sess->flags |= SESS_LOGGEDIN;
557 if(strcmp(sess->op->sessionType, "Discovery") == 0)
561 case 1: // redirect - temporary/permanent
563 | start from scratch?
565 sess->flags &= ~SESS_NEGODONE;
566 sess->flags |= (SESS_REDIRECT | SESS_INITIALLOGIN1);
567 syslog(LOG_DEBUG, "target sent REDIRECT");
570 case 2: // initiator terminal error
572 case 3: // target terminal error -- could retry ...
574 return T7; // lets try
581 handleLogoutResp(isess_t *sess, pdu_t *pp)
583 if(sess->flags & SESS_DISCONNECT)
589 startLogout(isess_t *sess)
592 logout_req_t *p = (logout_req_t *)&spp.ipdu.bhs;
594 bzero(&spp, sizeof(pdu_t));
595 p->cmd = ISCSI_LOGOUT_CMD| 0x40;
596 p->reason = BIT(7) | 0;
599 return sendPDU(sess, &spp, handleLogoutResp);
603 inLogout(isess_t *sess)
605 if(sess->flags & SESS_RECONNECT)
611 S1=1, S2, S3, S4, S5, S6, S7, S8
623 -------<-------------+
624 +--------->/ S1 \<----+ |
643 | | |T5 +--------+---------+
644 | | | /T16+-----+------+ |
645 | | | / -+-----+--+ | |
646 | | | / / S7 \ |T12| |
647 | | | / +->\ /<-+ V V
648 | | | / / -+----- -------
649 | | | / /T11 |T10 / S8 \
650 | | V / / V +----+ \ /
651 | | ---+-+- ----+-- | -------
652 | | / S5 \T9 / S6 \<+ ^
653 | +-----\ /--->\ / T14 |
654 | ------- --+----+------+T17
655 +---------------------------+
664 if((sess = calloc(1, sizeof(isess_t))) == NULL) {
665 // boy, is this a bad start ...
666 fprintf(stderr, "no memory!\n");
674 sess->target.address = strdup(op->targetAddress);
675 sess->target.port = op->port;
676 sess->target.pgt = op->targetPortalGroupTag;
678 sess->flags = SESS_INITIALLOGIN | SESS_INITIALLOGIN1;
683 switch(tcpConnect(sess)) {
684 case T1: state = S2; break;
685 default: state = S8; break;
690 switch(startSession(sess)) {
691 case T2: state = S1; break;
692 case T4: state = S4; break;
693 default: state = S8; break;
698 switch(doLogin(sess)) {
699 case T7: state = S1; break;
700 case T5: state = S5; break;
701 default: state = S8; break;
706 switch(supervise(sess)) {
707 case T8: state = S1; break;
708 case T9: state = S6; break;
709 case T11: state = S7; break;
710 case T15: state = S8; break;
711 default: state = S8; break;
716 switch(startLogout(sess)) {
717 case T13: state = S1; break;
718 case T14: state = S6; break;
719 case T16: state = S8; break;
720 default: state = S8; break;
725 switch(inLogout(sess)) {
726 case T18: state = S1; break;
727 case T10: state = S6; break;
728 case T12: state = S7; break;
729 case T16: state = S8; break;
730 default: state = S8; break;
735 // maybe do some clean up?
736 syslog(LOG_INFO, "terminated");
739 syslog(LOG_INFO, "unknown state %d", state);