1 /*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 #include <sys/ioctl.h> 36 #include <assert.h> 37 #include <stdbool.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <netinet/in.h> 42 43 #include "iscsid.h" 44 #include "iscsi_proto.h" 45 46 static struct pdu * 47 text_receive(struct connection *conn) 48 { 49 struct pdu *response; 50 struct iscsi_bhs_text_response *bhstr; 51 52 response = pdu_new(conn); 53 pdu_receive(response); 54 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_TEXT_RESPONSE) 55 log_errx(1, "protocol error: received invalid opcode 0x%x", 56 response->pdu_bhs->bhs_opcode); 57 bhstr = (struct iscsi_bhs_text_response *)response->pdu_bhs; 58 #if 0 59 if ((bhstr->bhstr_flags & BHSTR_FLAGS_FINAL) == 0) 60 log_errx(1, "received Text PDU without the \"F\" flag"); 61 #endif 62 /* 63 * XXX: Implement the C flag some day. 64 */ 65 if ((bhstr->bhstr_flags & BHSTR_FLAGS_CONTINUE) != 0) 66 log_errx(1, "received Text PDU with unsupported \"C\" flag"); 67 if (ntohl(bhstr->bhstr_statsn) != conn->conn_statsn + 1) { 68 log_errx(1, "received Text PDU with wrong StatSN: " 69 "is %d, should be %d", ntohl(bhstr->bhstr_statsn), 70 conn->conn_statsn + 1); 71 } 72 conn->conn_statsn = ntohl(bhstr->bhstr_statsn); 73 74 return (response); 75 } 76 77 static struct pdu * 78 text_new_request(struct connection *conn) 79 { 80 struct pdu *request; 81 struct iscsi_bhs_text_request *bhstr; 82 83 request = pdu_new(conn); 84 bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs; 85 bhstr->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_REQUEST | 86 ISCSI_BHS_OPCODE_IMMEDIATE; 87 bhstr->bhstr_flags = BHSTR_FLAGS_FINAL; 88 bhstr->bhstr_initiator_task_tag = 0; 89 bhstr->bhstr_target_transfer_tag = 0xffffffff; 90 91 bhstr->bhstr_initiator_task_tag = 0; /* XXX */ 92 bhstr->bhstr_cmdsn = 0; /* XXX */ 93 bhstr->bhstr_expstatsn = htonl(conn->conn_statsn + 1); 94 95 return (request); 96 } 97 98 static struct pdu * 99 logout_receive(struct connection *conn) 100 { 101 struct pdu *response; 102 struct iscsi_bhs_logout_response *bhslr; 103 104 response = pdu_new(conn); 105 pdu_receive(response); 106 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGOUT_RESPONSE) 107 log_errx(1, "protocol error: received invalid opcode 0x%x", 108 response->pdu_bhs->bhs_opcode); 109 bhslr = (struct iscsi_bhs_logout_response *)response->pdu_bhs; 110 if (ntohs(bhslr->bhslr_response) != BHSLR_RESPONSE_CLOSED_SUCCESSFULLY) 111 log_warnx("received Logout Response with reason %d", 112 ntohs(bhslr->bhslr_response)); 113 if (ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) { 114 log_errx(1, "received Logout PDU with wrong StatSN: " 115 "is %d, should be %d", ntohl(bhslr->bhslr_statsn), 116 conn->conn_statsn + 1); 117 } 118 conn->conn_statsn = ntohl(bhslr->bhslr_statsn); 119 120 return (response); 121 } 122 123 static struct pdu * 124 logout_new_request(struct connection *conn) 125 { 126 struct pdu *request; 127 struct iscsi_bhs_logout_request *bhslr; 128 129 request = pdu_new(conn); 130 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs; 131 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST | 132 ISCSI_BHS_OPCODE_IMMEDIATE; 133 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 134 bhslr->bhslr_reason |= 0x80; 135 bhslr->bhslr_initiator_task_tag = 0; /* XXX */ 136 bhslr->bhslr_cmdsn = 0; /* XXX */ 137 bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1); 138 139 return (request); 140 } 141 142 static void 143 kernel_add(const struct connection *conn, const char *target) 144 { 145 struct iscsi_session_add isa; 146 int error; 147 148 memset(&isa, 0, sizeof(isa)); 149 memcpy(&isa.isa_conf, &conn->conn_conf, sizeof(isa.isa_conf)); 150 strlcpy(isa.isa_conf.isc_target, target, 151 sizeof(isa.isa_conf.isc_target)); 152 isa.isa_conf.isc_discovery = 0; 153 error = ioctl(conn->conn_iscsi_fd, ISCSISADD, &isa); 154 if (error != 0) 155 log_warn("failed to add %s: ISCSISADD", target); 156 } 157 158 static void 159 kernel_remove(const struct connection *conn) 160 { 161 struct iscsi_session_remove isr; 162 int error; 163 164 memset(&isr, 0, sizeof(isr)); 165 isr.isr_session_id = conn->conn_session_id; 166 error = ioctl(conn->conn_iscsi_fd, ISCSISREMOVE, &isr); 167 if (error != 0) 168 log_warn("ISCSISREMOVE"); 169 } 170 171 void 172 discovery(struct connection *conn) 173 { 174 struct pdu *request, *response; 175 struct keys *request_keys, *response_keys; 176 int i; 177 178 log_debugx("beginning discovery session"); 179 request = text_new_request(conn); 180 request_keys = keys_new(); 181 keys_add(request_keys, "SendTargets", "All"); 182 keys_save(request_keys, request); 183 keys_delete(request_keys); 184 request_keys = NULL; 185 pdu_send(request); 186 pdu_delete(request); 187 request = NULL; 188 189 log_debugx("waiting for Text Response"); 190 response = text_receive(conn); 191 response_keys = keys_new(); 192 keys_load(response_keys, response); 193 for (i = 0; i < KEYS_MAX; i++) { 194 if (response_keys->keys_names[i] == NULL) 195 break; 196 197 if (strcmp(response_keys->keys_names[i], "TargetName") != 0) 198 continue; 199 200 log_debugx("adding target %s", response_keys->keys_values[i]); 201 /* 202 * XXX: Validate the target name? 203 */ 204 kernel_add(conn, response_keys->keys_values[i]); 205 } 206 keys_delete(response_keys); 207 pdu_delete(response); 208 209 log_debugx("removing temporary discovery session"); 210 kernel_remove(conn); 211 212 log_debugx("discovery done; logging out"); 213 request = logout_new_request(conn); 214 pdu_send(request); 215 pdu_delete(request); 216 request = NULL; 217 218 log_debugx("waiting for Logout Response"); 219 response = logout_receive(conn); 220 pdu_delete(response); 221 222 log_debugx("discovery session done"); 223 } 224