MFC r273635, r273793, r274797: Add basic iSNS client to the iSCSI target.

This makes ctld(8) register its iSCSI targets and portals on configured
iSNS servers to allow initiators find them without active discovery.

Fetching of allowed initiators from iSNS is not implemented now, so target
ACLs still should be configured manually.

Relnotes:	Yes
Sponsored by:	iXsystems, Inc.

1 files changed, 92 insertions, 0 deletions

diff --git a/usr.sbin/ctld/isns.h b/usr.sbin/ctld/isns.h
new file mode 100644
index 0000000..00e6b50
--- /dev/null
+++ b/usr.sbin/ctld/isns.h
@@ -0,0 +1,92 @@
+/*-
+ * Copyright (c) 2014 Alexander Motin <mav@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_ISNS_H
+#define	_ISNS_H
+
+#define	ISNS_VERSION		0x0001
+
+#define	ISNS_FUNC_DEVATTRREG	0x0001
+#define	ISNS_FUNC_DEVATTRQRY	0x0002
+#define	ISNS_FUNC_DEVGETNEXT	0x0003
+#define	ISNS_FUNC_DEVDEREG	0x0004
+#define	ISNS_FUNC_SCNREG	0x0005
+#define	ISNS_FUNC_SCNDEREG	0x0006
+#define	ISNS_FUNC_SCNEVENT	0x0007
+#define	ISNS_FUNC_SCN		0x0008
+#define	ISNS_FUNC_DDREG		0x0009
+#define	ISNS_FUNC_DDDEREG	0x000a
+#define	ISNS_FUNC_DDSREG	0x000b
+#define	ISNS_FUNC_DDSDEREG	0x000c
+#define	ISNS_FUNC_ESI		0x000d
+#define	ISNS_FUNC_HEARTBEAT	0x000e
+#define	ISNS_FUNC_RESPONSE	0x8000
+
+#define	ISNS_FLAG_CLIENT	0x8000
+#define	ISNS_FLAG_SERVER	0x4000
+#define	ISNS_FLAG_AUTH		0x2000
+#define	ISNS_FLAG_REPLACE	0x1000
+#define	ISNS_FLAG_LAST		0x0800
+#define	ISNS_FLAG_FIRST		0x0400
+
+struct isns_hdr {
+	uint8_t	ih_version[2];
+	uint8_t	ih_function[2];
+	uint8_t	ih_length[2];
+	uint8_t	ih_flags[2];
+	uint8_t	ih_transaction[2];
+	uint8_t	ih_sequence[2];
+};
+
+struct isns_tlv {
+	uint8_t	it_tag[4];
+	uint8_t	it_length[4];
+	uint8_t	it_value[];
+};
+
+struct isns_req {
+	u_int	ir_buflen;
+	u_int	ir_usedlen;
+	uint8_t	*ir_buf;
+};
+
+struct isns_req * isns_req_alloc(void);
+struct isns_req * isns_req_create(uint16_t func, uint16_t flags);
+void isns_req_free(struct isns_req *req);
+void isns_req_add(struct isns_req *req, uint32_t tag, uint32_t len,
+    const void *value);
+void isns_req_add_delim(struct isns_req *req);
+void isns_req_add_str(struct isns_req *req, uint32_t tag, const char *value);
+void isns_req_add_32(struct isns_req *req, uint32_t tag, uint32_t value);
+void isns_req_add_addr(struct isns_req *req, uint32_t tag, struct addrinfo *ai);
+void isns_req_add_port(struct isns_req *req, uint32_t tag, struct addrinfo *ai);
+int isns_req_send(int s, struct isns_req *req);
+int isns_req_receive(int s, struct isns_req *req);
+uint32_t isns_req_get_status(struct isns_req *req);
+
+#endif /* _ISNS_H */