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 * $FreeBSD$ 30 */ 31 32#include <sys/types.h> 33#include <sys/ioctl.h> 34#include <assert.h> 35#include <stdbool.h> 36#include <stdio.h> 37#include <stdlib.h> 38#include <string.h> 39#include <netinet/in.h> 40 41#include "iscsid.h" 42#include "iscsi_proto.h" 43 44static struct pdu * 45text_receive(struct connection *conn) 46{ 47 struct pdu *response; 48 struct iscsi_bhs_text_response *bhstr; 49 50 response = pdu_new(conn); 51 pdu_receive(response); 52 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_TEXT_RESPONSE) 53 log_errx(1, "protocol error: received invalid opcode 0x%x", 54 response->pdu_bhs->bhs_opcode); 55 bhstr = (struct iscsi_bhs_text_response *)response->pdu_bhs; 56#if 0 57 if ((bhstr->bhstr_flags & BHSTR_FLAGS_FINAL) == 0) 58 log_errx(1, "received Text PDU without the \"F\" flag"); 59#endif 60 /* 61 * XXX: Implement the C flag some day. 62 */ 63 if ((bhstr->bhstr_flags & BHSTR_FLAGS_CONTINUE) != 0) 64 log_errx(1, "received Text PDU with unsupported \"C\" flag"); 65 if (response->pdu_data_len == 0) 66 log_errx(1, "received Text PDU with empty data segment"); 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 77static struct pdu * 78text_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 98static struct pdu * 99logout_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 123static struct pdu * 124logout_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 142static void 143kernel_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 158static void 159kernel_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 171void 172discovery(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