Author: trasz
Date: Wed Jun 18 17:35:40 2014
New Revision: 267613
URL: http://svnweb.freebsd.org/changeset/base/267613
Log:
Implement redirection handling in initiator.
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/dev/iscsi/iscsi.c
head/sys/dev/iscsi/iscsi_ioctl.h
head/usr.sbin/iscsid/iscsid.c
head/usr.sbin/iscsid/login.c
Modified: head/sys/dev/iscsi/iscsi.c
==============================================================================
--- head/sys/dev/iscsi/iscsi.c Wed Jun 18 17:21:38 2014 (r267612)
+++ head/sys/dev/iscsi/iscsi.c Wed Jun 18 17:35:40 2014 (r267613)
@@ -1589,6 +1589,33 @@ iscsi_sanitize_session_conf(struct iscsi
isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0';
}
+static bool
+iscsi_valid_session_conf(const struct iscsi_session_conf *isc)
+{
+
+ if (isc->isc_initiator[0] == '\0') {
+ ISCSI_DEBUG("empty isc_initiator");
+ return (false);
+ }
+
+ if (isc->isc_target_addr[0] == '\0') {
+ ISCSI_DEBUG("empty isc_target_addr");
+ return (false);
+ }
+
+ if (isc->isc_discovery != 0 && isc->isc_target[0] != 0) {
+ ISCSI_DEBUG("non-empty isc_target for discovery session");
+ return (false);
+ }
+
+ if (isc->isc_discovery == 0 && isc->isc_target[0] == 0) {
+ ISCSI_DEBUG("empty isc_target for non-discovery session");
+ return (false);
+ }
+
+ return (true);
+}
+
static int
iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa)
{
@@ -1597,22 +1624,12 @@ iscsi_ioctl_session_add(struct iscsi_sof
int error;
iscsi_sanitize_session_conf(&isa->isa_conf);
+ if (iscsi_valid_session_conf(&isa->isa_conf) == false)
+ return (EINVAL);
is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK);
memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf));
- if (is->is_conf.isc_initiator[0] == '\0' ||
- is->is_conf.isc_target_addr[0] == '\0') {
- free(is, M_ISCSI);
- return (EINVAL);
- }
-
- if ((is->is_conf.isc_discovery != 0 && is->is_conf.isc_target[0] != 0)
||
- (is->is_conf.isc_discovery == 0 && is->is_conf.isc_target[0] == 0))
{
- free(is, M_ISCSI);
- return (EINVAL);
- }
-
sx_xlock(&sc->sc_lock);
/*
@@ -1769,7 +1786,38 @@ iscsi_ioctl_session_list(struct iscsi_so
return (0);
}
-
+
+static int
+iscsi_ioctl_session_modify(struct iscsi_softc *sc,
+ struct iscsi_session_modify *ism)
+{
+ struct iscsi_session *is;
+
+ iscsi_sanitize_session_conf(&ism->ism_conf);
+ if (iscsi_valid_session_conf(&ism->ism_conf) == false)
+ return (EINVAL);
+
+ sx_xlock(&sc->sc_lock);
+ TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
+ ISCSI_SESSION_LOCK(is);
+ if (is->is_id == ism->ism_session_id)
+ break;
+ ISCSI_SESSION_UNLOCK(is);
+ }
+ if (is == NULL) {
+ sx_xunlock(&sc->sc_lock);
+ return (ESRCH);
+ }
+ sx_xunlock(&sc->sc_lock);
+
+ memcpy(&is->is_conf, &ism->ism_conf, sizeof(is->is_conf));
+ ISCSI_SESSION_UNLOCK(is);
+
+ iscsi_session_reconnect(is);
+
+ return (0);
+}
+
static int
iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
struct thread *td)
@@ -1808,6 +1856,9 @@ iscsi_ioctl(struct cdev *dev, u_long cmd
case ISCSISLIST:
return (iscsi_ioctl_session_list(sc,
(struct iscsi_session_list *)arg));
+ case ISCSISMODIFY:
+ return (iscsi_ioctl_session_modify(sc,
+ (struct iscsi_session_modify *)arg));
default:
return (EINVAL);
}
Modified: head/sys/dev/iscsi/iscsi_ioctl.h
==============================================================================
--- head/sys/dev/iscsi/iscsi_ioctl.h Wed Jun 18 17:21:38 2014
(r267612)
+++ head/sys/dev/iscsi/iscsi_ioctl.h Wed Jun 18 17:35:40 2014
(r267613)
@@ -202,8 +202,15 @@ struct iscsi_session_list {
int isl_spare[4];
};
+struct iscsi_session_modify {
+ unsigned int ism_session_id;
+ struct iscsi_session_conf ism_conf;
+ int ism_spare[4];
+};
+
#define ISCSISADD _IOW('I', 0x11, struct iscsi_session_add)
#define ISCSISREMOVE _IOW('I', 0x12, struct iscsi_session_remove)
#define ISCSISLIST _IOWR('I', 0x13, struct iscsi_session_list)
+#define ISCSISMODIFY _IOWR('I', 0x14, struct iscsi_session_modify)
#endif /* !ISCSI_IOCTL_H */
Modified: head/usr.sbin/iscsid/iscsid.c
==============================================================================
--- head/usr.sbin/iscsid/iscsid.c Wed Jun 18 17:21:38 2014
(r267612)
+++ head/usr.sbin/iscsid/iscsid.c Wed Jun 18 17:35:40 2014
(r267613)
@@ -304,10 +304,10 @@ capsicate(struct connection *conn)
cap_rights_t rights;
#ifdef ICL_KERNEL_PROXY
const unsigned long cmds[] = { ISCSIDCONNECT, ISCSIDSEND, ISCSIDRECEIVE,
- ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD, ISCSISREMOVE };
+ ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD, ISCSISREMOVE, ISCSISMODIFY };
#else
const unsigned long cmds[] = { ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD,
- ISCSISREMOVE };
+ ISCSISREMOVE, ISCSISMODIFY };
#endif
cap_rights_init(&rights, CAP_IOCTL);
Modified: head/usr.sbin/iscsid/login.c
==============================================================================
--- head/usr.sbin/iscsid/login.c Wed Jun 18 17:21:38 2014
(r267612)
+++ head/usr.sbin/iscsid/login.c Wed Jun 18 17:35:40 2014
(r267613)
@@ -30,6 +30,7 @@
*/
#include <sys/types.h>
+#include <sys/ioctl.h>
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
@@ -158,6 +159,60 @@ login_target_error_str(int class, int de
}
}
+static void
+kernel_modify(const struct connection *conn, const char *target_address)
+{
+ struct iscsi_session_modify ism;
+ int error;
+
+ memset(&ism, 0, sizeof(ism));
+ ism.ism_session_id = conn->conn_session_id;
+ memcpy(&ism.ism_conf, &conn->conn_conf, sizeof(ism.ism_conf));
+ strlcpy(ism.ism_conf.isc_target_addr, target_address,
+ sizeof(ism.ism_conf.isc_target));
+ error = ioctl(conn->conn_iscsi_fd, ISCSISMODIFY, &ism);
+ if (error != 0) {
+ log_err(1, "failed to redirect to %s: ISCSISMODIFY",
+ target_address);
+ }
+}
+
+/*
+ * XXX: The way it works is suboptimal; what should happen is described
+ * in draft-gilligan-iscsi-fault-tolerance-00. That, however, would
+ * be much more complicated: we would need to keep "dependencies"
+ * for sessions, so that, in case described in draft and using draft
+ * terminology, we would have three sessions: one for discovery,
+ * one for initial target portal, and one for redirect portal.
+ * This would allow us to "backtrack" on connection failure,
+ * as described in draft.
+ */
+static void
+login_handle_redirection(struct connection *conn, struct pdu *response)
+{
+ struct iscsi_bhs_login_response *bhslr;
+ struct keys *response_keys;
+ const char *target_address;
+
+ bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
+ assert (bhslr->bhslr_status_class == 1);
+
+ response_keys = keys_new();
+ keys_load(response_keys, response);
+
+ target_address = keys_find(response_keys, "TargetAddress");
+ if (target_address == NULL)
+ log_errx(1, "received redirection without TargetAddress");
+ if (target_address[0] == '\0')
+ log_errx(1, "received redirection with empty TargetAddress");
+ if (strlen(target_address) >=
+ sizeof(conn->conn_conf.isc_target_addr) - 1)
+ log_errx(1, "received TargetAddress is too long");
+
+ log_debugx("received redirection to \"%s\"", target_address);
+ kernel_modify(conn, target_address);
+}
+
static struct pdu *
login_receive(struct connection *conn)
{
@@ -184,6 +239,11 @@ login_receive(struct connection *conn)
if (bhslr->bhslr_version_active != 0x00)
log_errx(1, "received Login PDU with unsupported "
"Version-active 0x%x", bhslr->bhslr_version_active);
+ if (bhslr->bhslr_status_class == 1) {
+ login_handle_redirection(conn, response);
+ log_debugx("redirection handled; exiting");
+ exit(0);
+ }
if (bhslr->bhslr_status_class != 0) {
errorstr = login_target_error_str(bhslr->bhslr_status_class,
bhslr->bhslr_status_detail);
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