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/types.h> 33 #include <sys/ioctl.h> 34 #include <stdbool.h> 35 #include <string.h> 36 #include <netinet/in.h> 37 38 #include "iscsid.h" 39 #include "iscsi_proto.h" 40 41 static struct pdu * 42 logout_receive(struct connection *conn) 43 { 44 struct pdu *response; 45 struct iscsi_bhs_logout_response *bhslr; 46 47 response = pdu_new(conn); 48 pdu_receive(response); 49 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGOUT_RESPONSE) 50 log_errx(1, "protocol error: received invalid opcode 0x%x", 51 response->pdu_bhs->bhs_opcode); 52 bhslr = (struct iscsi_bhs_logout_response *)response->pdu_bhs; 53 if (ntohs(bhslr->bhslr_response) != BHSLR_RESPONSE_CLOSED_SUCCESSFULLY) 54 log_warnx("received Logout Response with reason %d", 55 ntohs(bhslr->bhslr_response)); 56 if (ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) { 57 log_errx(1, "received Logout PDU with wrong StatSN: " 58 "is %u, should be %u", ntohl(bhslr->bhslr_statsn), 59 conn->conn_statsn + 1); 60 } 61 conn->conn_statsn = ntohl(bhslr->bhslr_statsn); 62 63 return (response); 64 } 65 66 static struct pdu * 67 logout_new_request(struct connection *conn) 68 { 69 struct pdu *request; 70 struct iscsi_bhs_logout_request *bhslr; 71 72 request = pdu_new(conn); 73 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs; 74 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST | 75 ISCSI_BHS_OPCODE_IMMEDIATE; 76 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 77 bhslr->bhslr_reason |= 0x80; 78 bhslr->bhslr_initiator_task_tag = 0; /* XXX */ 79 bhslr->bhslr_cmdsn = 0; /* XXX */ 80 bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1); 81 82 return (request); 83 } 84 85 static void 86 kernel_add(const struct iscsid_connection *conn, const char *target) 87 { 88 struct iscsi_session_add isa; 89 int error; 90 91 memset(&isa, 0, sizeof(isa)); 92 memcpy(&isa.isa_conf, &conn->conn_conf, sizeof(isa.isa_conf)); 93 strlcpy(isa.isa_conf.isc_target, target, 94 sizeof(isa.isa_conf.isc_target)); 95 isa.isa_conf.isc_discovery = 0; 96 error = ioctl(conn->conn_iscsi_fd, ISCSISADD, &isa); 97 if (error != 0) 98 log_warn("failed to add %s: ISCSISADD", target); 99 } 100 101 static void 102 kernel_remove(const struct iscsid_connection *conn) 103 { 104 struct iscsi_session_remove isr; 105 int error; 106 107 memset(&isr, 0, sizeof(isr)); 108 isr.isr_session_id = conn->conn_session_id; 109 error = ioctl(conn->conn_iscsi_fd, ISCSISREMOVE, &isr); 110 if (error != 0) 111 log_warn("ISCSISREMOVE"); 112 } 113 114 void 115 discovery(struct iscsid_connection *conn) 116 { 117 struct pdu *request, *response; 118 struct keys *request_keys, *response_keys; 119 int i; 120 121 log_debugx("beginning discovery session"); 122 request_keys = keys_new(); 123 keys_add(request_keys, "SendTargets", "All"); 124 text_send_request(&conn->conn, request_keys); 125 keys_delete(request_keys); 126 request_keys = NULL; 127 128 log_debugx("waiting for Text Response"); 129 response_keys = text_read_response(&conn->conn); 130 for (i = 0; i < KEYS_MAX; i++) { 131 if (response_keys->keys_names[i] == NULL) 132 break; 133 134 if (strcmp(response_keys->keys_names[i], "TargetName") != 0) 135 continue; 136 137 log_debugx("adding target %s", response_keys->keys_values[i]); 138 /* 139 * XXX: Validate the target name? 140 */ 141 kernel_add(conn, response_keys->keys_values[i]); 142 } 143 keys_delete(response_keys); 144 145 log_debugx("removing temporary discovery session"); 146 kernel_remove(conn); 147 148 #ifdef ICL_KERNEL_PROXY 149 if (conn->conn_conf.isc_iser == 1) { 150 /* 151 * If we're going through the proxy, the kernel already 152 * sent Logout PDU for us and destroyed the session, 153 * so we can't send anything anymore. 154 */ 155 log_debugx("discovery session done"); 156 return; 157 } 158 #endif 159 160 log_debugx("discovery done; logging out"); 161 request = logout_new_request(&conn->conn); 162 pdu_send(request); 163 pdu_delete(request); 164 request = NULL; 165 166 log_debugx("waiting for Logout Response"); 167 response = logout_receive(&conn->conn); 168 pdu_delete(response); 169 170 log_debugx("discovery session done"); 171 } 172