1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2012 The FreeBSD Foundation
5 *
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 */
31
32 #include <sys/cdefs.h>
33 #include <sys/types.h>
34 #include <sys/ioctl.h>
35 #include <stdbool.h>
36 #include <string.h>
37 #include <netinet/in.h>
38
39 #include "iscsid.h"
40 #include "iscsi_proto.h"
41
42 static struct pdu *
logout_receive(struct connection * conn)43 logout_receive(struct connection *conn)
44 {
45 struct pdu *response;
46 struct iscsi_bhs_logout_response *bhslr;
47
48 response = pdu_new(conn);
49 pdu_receive(response);
50 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGOUT_RESPONSE)
51 log_errx(1, "protocol error: received invalid opcode 0x%x",
52 response->pdu_bhs->bhs_opcode);
53 bhslr = (struct iscsi_bhs_logout_response *)response->pdu_bhs;
54 if (ntohs(bhslr->bhslr_response) != BHSLR_RESPONSE_CLOSED_SUCCESSFULLY)
55 log_warnx("received Logout Response with reason %d",
56 ntohs(bhslr->bhslr_response));
57 if (ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) {
58 log_errx(1, "received Logout PDU with wrong StatSN: "
59 "is %u, should be %u", ntohl(bhslr->bhslr_statsn),
60 conn->conn_statsn + 1);
61 }
62 conn->conn_statsn = ntohl(bhslr->bhslr_statsn);
63
64 return (response);
65 }
66
67 static struct pdu *
logout_new_request(struct connection * conn)68 logout_new_request(struct connection *conn)
69 {
70 struct pdu *request;
71 struct iscsi_bhs_logout_request *bhslr;
72
73 request = pdu_new(conn);
74 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs;
75 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST |
76 ISCSI_BHS_OPCODE_IMMEDIATE;
77 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION;
78 bhslr->bhslr_reason |= 0x80;
79 bhslr->bhslr_initiator_task_tag = 0; /* XXX */
80 bhslr->bhslr_cmdsn = 0; /* XXX */
81 bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1);
82
83 return (request);
84 }
85
86 static void
kernel_add(const struct iscsid_connection * conn,const char * target)87 kernel_add(const struct iscsid_connection *conn, const char *target)
88 {
89 struct iscsi_session_add isa;
90 int error;
91
92 memset(&isa, 0, sizeof(isa));
93 memcpy(&isa.isa_conf, &conn->conn_conf, sizeof(isa.isa_conf));
94 strlcpy(isa.isa_conf.isc_target, target,
95 sizeof(isa.isa_conf.isc_target));
96 isa.isa_conf.isc_discovery = 0;
97 error = ioctl(conn->conn_iscsi_fd, ISCSISADD, &isa);
98 if (error != 0)
99 log_warn("failed to add %s: ISCSISADD", target);
100 }
101
102 static void
kernel_remove(const struct iscsid_connection * conn)103 kernel_remove(const struct iscsid_connection *conn)
104 {
105 struct iscsi_session_remove isr;
106 int error;
107
108 memset(&isr, 0, sizeof(isr));
109 isr.isr_session_id = conn->conn_session_id;
110 error = ioctl(conn->conn_iscsi_fd, ISCSISREMOVE, &isr);
111 if (error != 0)
112 log_warn("ISCSISREMOVE");
113 }
114
115 void
discovery(struct iscsid_connection * conn)116 discovery(struct iscsid_connection *conn)
117 {
118 struct pdu *request, *response;
119 struct keys *request_keys, *response_keys;
120 int i;
121
122 log_debugx("beginning discovery session");
123 request_keys = keys_new();
124 keys_add(request_keys, "SendTargets", "All");
125 text_send_request(&conn->conn, request_keys);
126 keys_delete(request_keys);
127 request_keys = NULL;
128
129 log_debugx("waiting for Text Response");
130 response_keys = text_read_response(&conn->conn);
131 for (i = 0; i < KEYS_MAX; i++) {
132 if (response_keys->keys_names[i] == NULL)
133 break;
134
135 if (strcmp(response_keys->keys_names[i], "TargetName") != 0)
136 continue;
137
138 log_debugx("adding target %s", response_keys->keys_values[i]);
139 /*
140 * XXX: Validate the target name?
141 */
142 kernel_add(conn, response_keys->keys_values[i]);
143 }
144 keys_delete(response_keys);
145
146 log_debugx("removing temporary discovery session");
147 kernel_remove(conn);
148
149 #ifdef ICL_KERNEL_PROXY
150 if (conn->conn_conf.isc_iser == 1) {
151 /*
152 * If we're going through the proxy, the kernel already
153 * sent Logout PDU for us and destroyed the session,
154 * so we can't send anything anymore.
155 */
156 log_debugx("discovery session done");
157 return;
158 }
159 #endif
160
161 log_debugx("discovery done; logging out");
162 request = logout_new_request(&conn->conn);
163 pdu_send(request);
164 pdu_delete(request);
165 request = NULL;
166
167 log_debugx("waiting for Logout Response");
168 response = logout_receive(&conn->conn);
169 pdu_delete(response);
170
171 log_debugx("discovery session done");
172 }
173