219 lines
7.1 KiB
C
219 lines
7.1 KiB
C
/*-
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* Copyright (c) 2012 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <assert.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <netinet/in.h>
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#include "ctld.h"
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#include "iscsi_proto.h"
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static struct pdu *
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text_receive(struct connection *conn)
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{
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struct pdu *request;
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struct iscsi_bhs_text_request *bhstr;
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request = pdu_new(conn);
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pdu_receive(request);
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if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) !=
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ISCSI_BHS_OPCODE_TEXT_REQUEST)
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log_errx(1, "protocol error: received invalid opcode 0x%x",
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request->pdu_bhs->bhs_opcode);
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bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs;
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#if 0
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if ((bhstr->bhstr_flags & ISCSI_BHSTR_FLAGS_FINAL) == 0)
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log_errx(1, "received Text PDU without the \"F\" flag");
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#endif
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/*
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* XXX: Implement the C flag some day.
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*/
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if ((bhstr->bhstr_flags & BHSTR_FLAGS_CONTINUE) != 0)
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log_errx(1, "received Text PDU with unsupported \"C\" flag");
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if (ntohl(bhstr->bhstr_cmdsn) < conn->conn_cmdsn) {
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log_errx(1, "received Text PDU with decreasing CmdSN: "
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"was %d, is %d", conn->conn_cmdsn, ntohl(bhstr->bhstr_cmdsn));
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}
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if (ntohl(bhstr->bhstr_expstatsn) != conn->conn_statsn) {
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log_errx(1, "received Text PDU with wrong StatSN: "
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"is %d, should be %d", ntohl(bhstr->bhstr_expstatsn),
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conn->conn_statsn);
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}
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conn->conn_cmdsn = ntohl(bhstr->bhstr_cmdsn);
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return (request);
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}
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static struct pdu *
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text_new_response(struct pdu *request)
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{
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struct pdu *response;
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struct connection *conn;
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struct iscsi_bhs_text_request *bhstr;
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struct iscsi_bhs_text_response *bhstr2;
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bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs;
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conn = request->pdu_connection;
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response = pdu_new_response(request);
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bhstr2 = (struct iscsi_bhs_text_response *)response->pdu_bhs;
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bhstr2->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_RESPONSE;
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bhstr2->bhstr_flags = BHSTR_FLAGS_FINAL;
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bhstr2->bhstr_lun = bhstr->bhstr_lun;
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bhstr2->bhstr_initiator_task_tag = bhstr->bhstr_initiator_task_tag;
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bhstr2->bhstr_target_transfer_tag = bhstr->bhstr_target_transfer_tag;
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bhstr2->bhstr_statsn = htonl(conn->conn_statsn++);
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bhstr2->bhstr_expcmdsn = htonl(conn->conn_cmdsn);
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bhstr2->bhstr_maxcmdsn = htonl(conn->conn_cmdsn);
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return (response);
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}
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static struct pdu *
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logout_receive(struct connection *conn)
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{
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struct pdu *request;
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struct iscsi_bhs_logout_request *bhslr;
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request = pdu_new(conn);
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pdu_receive(request);
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if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) !=
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ISCSI_BHS_OPCODE_LOGOUT_REQUEST)
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log_errx(1, "protocol error: received invalid opcode 0x%x",
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request->pdu_bhs->bhs_opcode);
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bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs;
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if ((bhslr->bhslr_reason & 0x7f) != BHSLR_REASON_CLOSE_SESSION)
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log_debugx("received Logout PDU with invalid reason 0x%x; "
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"continuing anyway", bhslr->bhslr_reason & 0x7f);
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if (ntohl(bhslr->bhslr_cmdsn) < conn->conn_cmdsn) {
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log_errx(1, "received Logout PDU with decreasing CmdSN: "
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"was %d, is %d", conn->conn_cmdsn,
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ntohl(bhslr->bhslr_cmdsn));
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}
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if (ntohl(bhslr->bhslr_expstatsn) != conn->conn_statsn) {
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log_errx(1, "received Logout PDU with wrong StatSN: "
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"is %d, should be %d", ntohl(bhslr->bhslr_expstatsn),
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conn->conn_statsn);
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}
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conn->conn_cmdsn = ntohl(bhslr->bhslr_cmdsn);
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return (request);
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}
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static struct pdu *
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logout_new_response(struct pdu *request)
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{
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struct pdu *response;
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struct connection *conn;
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struct iscsi_bhs_logout_request *bhslr;
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struct iscsi_bhs_logout_response *bhslr2;
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bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs;
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conn = request->pdu_connection;
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response = pdu_new_response(request);
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bhslr2 = (struct iscsi_bhs_logout_response *)response->pdu_bhs;
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bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE;
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bhslr2->bhslr_flags = 0x80;
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bhslr2->bhslr_response = BHSLR_RESPONSE_CLOSED_SUCCESSFULLY;
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bhslr2->bhslr_initiator_task_tag = bhslr->bhslr_initiator_task_tag;
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bhslr2->bhslr_statsn = htonl(conn->conn_statsn++);
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bhslr2->bhslr_expcmdsn = htonl(conn->conn_cmdsn);
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bhslr2->bhslr_maxcmdsn = htonl(conn->conn_cmdsn);
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return (response);
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}
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void
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discovery(struct connection *conn)
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{
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struct pdu *request, *response;
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struct keys *request_keys, *response_keys;
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struct target *targ;
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const char *send_targets;
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log_debugx("beginning discovery session; waiting for Text PDU");
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request = text_receive(conn);
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request_keys = keys_new();
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keys_load(request_keys, request);
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send_targets = keys_find(request_keys, "SendTargets");
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if (send_targets == NULL)
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log_errx(1, "received Text PDU without SendTargets");
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response = text_new_response(request);
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response_keys = keys_new();
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if (strcmp(send_targets, "All") == 0) {
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TAILQ_FOREACH(targ,
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&conn->conn_portal->p_portal_group->pg_conf->conf_targets,
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t_next) {
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if (targ->t_portal_group !=
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conn->conn_portal->p_portal_group) {
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log_debugx("not returning target \"%s\"; "
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"belongs to a different portal group",
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targ->t_name);
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continue;
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}
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keys_add(response_keys, "TargetName", targ->t_name);
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}
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} else {
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targ = target_find(conn->conn_portal->p_portal_group->pg_conf,
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send_targets);
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if (targ == NULL) {
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log_debugx("initiator requested information on unknown "
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"target \"%s\"; returning nothing", send_targets);
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} else {
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keys_add(response_keys, "TargetName", targ->t_name);
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}
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}
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keys_save(response_keys, response);
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pdu_send(response);
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pdu_delete(response);
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keys_delete(response_keys);
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pdu_delete(request);
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keys_delete(request_keys);
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log_debugx("done sending targets; waiting for Logout PDU");
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request = logout_receive(conn);
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response = logout_new_response(request);
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pdu_send(response);
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pdu_delete(response);
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pdu_delete(request);
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log_debugx("discovery session done");
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}
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