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 <stdbool.h> 37 #include <string.h> 38 #include <netinet/in.h> 39 40 #include "iscsid.h" 41 #include "iscsi_proto.h" 42 43 static struct pdu * 44 text_receive(struct connection *conn) 45 { 46 struct pdu *response; 47 struct iscsi_bhs_text_response *bhstr; 48 49 response = pdu_new(conn); 50 pdu_receive(response); 51 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_TEXT_RESPONSE) 52 log_errx(1, "protocol error: received invalid opcode 0x%x", 53 response->pdu_bhs->bhs_opcode); 54 bhstr = (struct iscsi_bhs_text_response *)response->pdu_bhs; 55 #if 0 56 if ((bhstr->bhstr_flags & BHSTR_FLAGS_FINAL) == 0) 57 log_errx(1, "received Text PDU without the \"F\" flag"); 58 #endif 59 /* 60 * XXX: Implement the C flag some day. 61 */ 62 if ((bhstr->bhstr_flags & BHSTR_FLAGS_CONTINUE) != 0) 63 log_errx(1, "received Text PDU with unsupported \"C\" flag"); 64 if (ntohl(bhstr->bhstr_statsn) != conn->conn_statsn + 1) { 65 log_errx(1, "received Text PDU with wrong StatSN: " 66 "is %u, should be %u", ntohl(bhstr->bhstr_statsn), 67 conn->conn_statsn + 1); 68 } 69 conn->conn_statsn = ntohl(bhstr->bhstr_statsn); 70 71 return (response); 72 } 73 74 static struct pdu * 75 text_new_request(struct connection *conn) 76 { 77 struct pdu *request; 78 struct iscsi_bhs_text_request *bhstr; 79 80 request = pdu_new(conn); 81 bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs; 82 bhstr->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_REQUEST | 83 ISCSI_BHS_OPCODE_IMMEDIATE; 84 bhstr->bhstr_flags = BHSTR_FLAGS_FINAL; 85 bhstr->bhstr_initiator_task_tag = 0; 86 bhstr->bhstr_target_transfer_tag = 0xffffffff; 87 88 bhstr->bhstr_initiator_task_tag = 0; /* XXX */ 89 bhstr->bhstr_cmdsn = 0; /* XXX */ 90 bhstr->bhstr_expstatsn = htonl(conn->conn_statsn + 1); 91 92 return (request); 93 } 94 95 static struct pdu * 96 logout_receive(struct connection *conn) 97 { 98 struct pdu *response; 99 struct iscsi_bhs_logout_response *bhslr; 100 101 response = pdu_new(conn); 102 pdu_receive(response); 103 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGOUT_RESPONSE) 104 log_errx(1, "protocol error: received invalid opcode 0x%x", 105 response->pdu_bhs->bhs_opcode); 106 bhslr = (struct iscsi_bhs_logout_response *)response->pdu_bhs; 107 if (ntohs(bhslr->bhslr_response) != BHSLR_RESPONSE_CLOSED_SUCCESSFULLY) 108 log_warnx("received Logout Response with reason %d", 109 ntohs(bhslr->bhslr_response)); 110 if (ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) { 111 log_errx(1, "received Logout PDU with wrong StatSN: " 112 "is %u, should be %u", ntohl(bhslr->bhslr_statsn), 113 conn->conn_statsn + 1); 114 } 115 conn->conn_statsn = ntohl(bhslr->bhslr_statsn); 116 117 return (response); 118 } 119 120 static struct pdu * 121 logout_new_request(struct connection *conn) 122 { 123 struct pdu *request; 124 struct iscsi_bhs_logout_request *bhslr; 125 126 request = pdu_new(conn); 127 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs; 128 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST | 129 ISCSI_BHS_OPCODE_IMMEDIATE; 130 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 131 bhslr->bhslr_reason |= 0x80; 132 bhslr->bhslr_initiator_task_tag = 0; /* XXX */ 133 bhslr->bhslr_cmdsn = 0; /* XXX */ 134 bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1); 135 136 return (request); 137 } 138 139 static void 140 kernel_add(const struct connection *conn, const char *target) 141 { 142 struct iscsi_session_add isa; 143 int error; 144 145 memset(&isa, 0, sizeof(isa)); 146 memcpy(&isa.isa_conf, &conn->conn_conf, sizeof(isa.isa_conf)); 147 strlcpy(isa.isa_conf.isc_target, target, 148 sizeof(isa.isa_conf.isc_target)); 149 isa.isa_conf.isc_discovery = 0; 150 error = ioctl(conn->conn_iscsi_fd, ISCSISADD, &isa); 151 if (error != 0) 152 log_warn("failed to add %s: ISCSISADD", target); 153 } 154 155 static void 156 kernel_remove(const struct connection *conn) 157 { 158 struct iscsi_session_remove isr; 159 int error; 160 161 memset(&isr, 0, sizeof(isr)); 162 isr.isr_session_id = conn->conn_session_id; 163 error = ioctl(conn->conn_iscsi_fd, ISCSISREMOVE, &isr); 164 if (error != 0) 165 log_warn("ISCSISREMOVE"); 166 } 167 168 void 169 discovery(struct connection *conn) 170 { 171 struct pdu *request, *response; 172 struct keys *request_keys, *response_keys; 173 int i; 174 175 log_debugx("beginning discovery session"); 176 request = text_new_request(conn); 177 request_keys = keys_new(); 178 keys_add(request_keys, "SendTargets", "All"); 179 keys_save(request_keys, request); 180 keys_delete(request_keys); 181 request_keys = NULL; 182 pdu_send(request); 183 pdu_delete(request); 184 request = NULL; 185 186 log_debugx("waiting for Text Response"); 187 response = text_receive(conn); 188 response_keys = keys_new(); 189 keys_load(response_keys, response); 190 for (i = 0; i < KEYS_MAX; i++) { 191 if (response_keys->keys_names[i] == NULL) 192 break; 193 194 if (strcmp(response_keys->keys_names[i], "TargetName") != 0) 195 continue; 196 197 log_debugx("adding target %s", response_keys->keys_values[i]); 198 /* 199 * XXX: Validate the target name? 200 */ 201 kernel_add(conn, response_keys->keys_values[i]); 202 } 203 keys_delete(response_keys); 204 pdu_delete(response); 205 206 log_debugx("removing temporary discovery session"); 207 kernel_remove(conn); 208 209 log_debugx("discovery done; logging out"); 210 request = logout_new_request(conn); 211 pdu_send(request); 212 pdu_delete(request); 213 request = NULL; 214 215 log_debugx("waiting for Logout Response"); 216 response = logout_receive(conn); 217 pdu_delete(response); 218 219 log_debugx("discovery session done"); 220 } 221