discovery.c revision 262845
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: stable/10/usr.sbin/iscsid/discovery.c 262845 2014-03-06 11:14:36Z trasz $ 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 (ntohl(bhstr->bhstr_statsn) != conn->conn_statsn + 1) { 66 log_errx(1, "received Text PDU with wrong StatSN: " 67 "is %d, should be %d", ntohl(bhstr->bhstr_statsn), 68 conn->conn_statsn + 1); 69 } 70 conn->conn_statsn = ntohl(bhstr->bhstr_statsn); 71 72 return (response); 73} 74 75static struct pdu * 76text_new_request(struct connection *conn) 77{ 78 struct pdu *request; 79 struct iscsi_bhs_text_request *bhstr; 80 81 request = pdu_new(conn); 82 bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs; 83 bhstr->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_REQUEST | 84 ISCSI_BHS_OPCODE_IMMEDIATE; 85 bhstr->bhstr_flags = BHSTR_FLAGS_FINAL; 86 bhstr->bhstr_initiator_task_tag = 0; 87 bhstr->bhstr_target_transfer_tag = 0xffffffff; 88 89 bhstr->bhstr_initiator_task_tag = 0; /* XXX */ 90 bhstr->bhstr_cmdsn = 0; /* XXX */ 91 bhstr->bhstr_expstatsn = htonl(conn->conn_statsn + 1); 92 93 return (request); 94} 95 96static struct pdu * 97logout_receive(struct connection *conn) 98{ 99 struct pdu *response; 100 struct iscsi_bhs_logout_response *bhslr; 101 102 response = pdu_new(conn); 103 pdu_receive(response); 104 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGOUT_RESPONSE) 105 log_errx(1, "protocol error: received invalid opcode 0x%x", 106 response->pdu_bhs->bhs_opcode); 107 bhslr = (struct iscsi_bhs_logout_response *)response->pdu_bhs; 108 if (ntohs(bhslr->bhslr_response) != BHSLR_RESPONSE_CLOSED_SUCCESSFULLY) 109 log_warnx("received Logout Response with reason %d", 110 ntohs(bhslr->bhslr_response)); 111 if (ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) { 112 log_errx(1, "received Logout PDU with wrong StatSN: " 113 "is %d, should be %d", ntohl(bhslr->bhslr_statsn), 114 conn->conn_statsn + 1); 115 } 116 conn->conn_statsn = ntohl(bhslr->bhslr_statsn); 117 118 return (response); 119} 120 121static struct pdu * 122logout_new_request(struct connection *conn) 123{ 124 struct pdu *request; 125 struct iscsi_bhs_logout_request *bhslr; 126 127 request = pdu_new(conn); 128 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs; 129 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST | 130 ISCSI_BHS_OPCODE_IMMEDIATE; 131 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 132 bhslr->bhslr_reason |= 0x80; 133 bhslr->bhslr_initiator_task_tag = 0; /* XXX */ 134 bhslr->bhslr_cmdsn = 0; /* XXX */ 135 bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1); 136 137 return (request); 138} 139 140static void 141kernel_add(const struct connection *conn, const char *target) 142{ 143 struct iscsi_session_add isa; 144 int error; 145 146 memset(&isa, 0, sizeof(isa)); 147 memcpy(&isa.isa_conf, &conn->conn_conf, sizeof(isa.isa_conf)); 148 strlcpy(isa.isa_conf.isc_target, target, 149 sizeof(isa.isa_conf.isc_target)); 150 isa.isa_conf.isc_discovery = 0; 151 error = ioctl(conn->conn_iscsi_fd, ISCSISADD, &isa); 152 if (error != 0) 153 log_warn("failed to add %s: ISCSISADD", target); 154} 155 156static void 157kernel_remove(const struct connection *conn) 158{ 159 struct iscsi_session_remove isr; 160 int error; 161 162 memset(&isr, 0, sizeof(isr)); 163 isr.isr_session_id = conn->conn_session_id; 164 error = ioctl(conn->conn_iscsi_fd, ISCSISREMOVE, &isr); 165 if (error != 0) 166 log_warn("ISCSISREMOVE"); 167} 168 169void 170discovery(struct connection *conn) 171{ 172 struct pdu *request, *response; 173 struct keys *request_keys, *response_keys; 174 int i; 175 176 log_debugx("beginning discovery session"); 177 request = text_new_request(conn); 178 request_keys = keys_new(); 179 keys_add(request_keys, "SendTargets", "All"); 180 keys_save(request_keys, request); 181 keys_delete(request_keys); 182 request_keys = NULL; 183 pdu_send(request); 184 pdu_delete(request); 185 request = NULL; 186 187 log_debugx("waiting for Text Response"); 188 response = text_receive(conn); 189 response_keys = keys_new(); 190 keys_load(response_keys, response); 191 for (i = 0; i < KEYS_MAX; i++) { 192 if (response_keys->keys_names[i] == NULL) 193 break; 194 195 if (strcmp(response_keys->keys_names[i], "TargetName") != 0) 196 continue; 197 198 log_debugx("adding target %s", response_keys->keys_values[i]); 199 /* 200 * XXX: Validate the target name? 201 */ 202 kernel_add(conn, response_keys->keys_values[i]); 203 } 204 keys_delete(response_keys); 205 pdu_delete(response); 206 207 log_debugx("removing temporary discovery session"); 208 kernel_remove(conn); 209 210 log_debugx("discovery done; logging out"); 211 request = logout_new_request(conn); 212 pdu_send(request); 213 pdu_delete(request); 214 request = NULL; 215 216 log_debugx("waiting for Logout Response"); 217 response = logout_receive(conn); 218 pdu_delete(response); 219 220 log_debugx("discovery session done"); 221} 222