b7af91d012
The kernel already does this for us when we ask it to terminate the session. MFC after: 1 month Sponsored by: The FreeBSD Foundation
233 lines
6.8 KiB
C
233 lines
6.8 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <stdbool.h>
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#include <string.h>
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#include <netinet/in.h>
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#include "iscsid.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 *response;
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struct iscsi_bhs_text_response *bhstr;
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response = pdu_new(conn);
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pdu_receive(response);
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if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_TEXT_RESPONSE)
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log_errx(1, "protocol error: received invalid opcode 0x%x",
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response->pdu_bhs->bhs_opcode);
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bhstr = (struct iscsi_bhs_text_response *)response->pdu_bhs;
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#if 0
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if ((bhstr->bhstr_flags & 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_statsn) != conn->conn_statsn + 1) {
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log_errx(1, "received Text PDU with wrong StatSN: "
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"is %u, should be %u", ntohl(bhstr->bhstr_statsn),
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conn->conn_statsn + 1);
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}
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conn->conn_statsn = ntohl(bhstr->bhstr_statsn);
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return (response);
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}
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static struct pdu *
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text_new_request(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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bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs;
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bhstr->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_REQUEST |
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ISCSI_BHS_OPCODE_IMMEDIATE;
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bhstr->bhstr_flags = BHSTR_FLAGS_FINAL;
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bhstr->bhstr_initiator_task_tag = 0;
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bhstr->bhstr_target_transfer_tag = 0xffffffff;
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bhstr->bhstr_initiator_task_tag = 0; /* XXX */
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bhstr->bhstr_cmdsn = 0; /* XXX */
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bhstr->bhstr_expstatsn = htonl(conn->conn_statsn + 1);
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return (request);
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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 *response;
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struct iscsi_bhs_logout_response *bhslr;
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response = pdu_new(conn);
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pdu_receive(response);
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if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGOUT_RESPONSE)
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log_errx(1, "protocol error: received invalid opcode 0x%x",
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response->pdu_bhs->bhs_opcode);
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bhslr = (struct iscsi_bhs_logout_response *)response->pdu_bhs;
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if (ntohs(bhslr->bhslr_response) != BHSLR_RESPONSE_CLOSED_SUCCESSFULLY)
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log_warnx("received Logout Response with reason %d",
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ntohs(bhslr->bhslr_response));
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if (ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) {
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log_errx(1, "received Logout PDU with wrong StatSN: "
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"is %u, should be %u", ntohl(bhslr->bhslr_statsn),
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conn->conn_statsn + 1);
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}
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conn->conn_statsn = ntohl(bhslr->bhslr_statsn);
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return (response);
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}
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static struct pdu *
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logout_new_request(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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bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs;
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bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST |
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ISCSI_BHS_OPCODE_IMMEDIATE;
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bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION;
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bhslr->bhslr_reason |= 0x80;
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bhslr->bhslr_initiator_task_tag = 0; /* XXX */
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bhslr->bhslr_cmdsn = 0; /* XXX */
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bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1);
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return (request);
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}
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static void
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kernel_add(const struct connection *conn, const char *target)
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{
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struct iscsi_session_add isa;
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int error;
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memset(&isa, 0, sizeof(isa));
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memcpy(&isa.isa_conf, &conn->conn_conf, sizeof(isa.isa_conf));
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strlcpy(isa.isa_conf.isc_target, target,
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sizeof(isa.isa_conf.isc_target));
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isa.isa_conf.isc_discovery = 0;
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error = ioctl(conn->conn_iscsi_fd, ISCSISADD, &isa);
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if (error != 0)
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log_warn("failed to add %s: ISCSISADD", target);
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}
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static void
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kernel_remove(const struct connection *conn)
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{
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struct iscsi_session_remove isr;
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int error;
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memset(&isr, 0, sizeof(isr));
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isr.isr_session_id = conn->conn_session_id;
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error = ioctl(conn->conn_iscsi_fd, ISCSISREMOVE, &isr);
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if (error != 0)
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log_warn("ISCSISREMOVE");
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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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int i;
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log_debugx("beginning discovery session");
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request = text_new_request(conn);
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request_keys = keys_new();
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keys_add(request_keys, "SendTargets", "All");
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keys_save(request_keys, request);
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keys_delete(request_keys);
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request_keys = NULL;
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pdu_send(request);
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pdu_delete(request);
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request = NULL;
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log_debugx("waiting for Text Response");
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response = text_receive(conn);
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response_keys = keys_new();
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keys_load(response_keys, response);
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for (i = 0; i < KEYS_MAX; i++) {
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if (response_keys->keys_names[i] == NULL)
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break;
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if (strcmp(response_keys->keys_names[i], "TargetName") != 0)
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continue;
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log_debugx("adding target %s", response_keys->keys_values[i]);
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/*
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* XXX: Validate the target name?
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*/
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kernel_add(conn, response_keys->keys_values[i]);
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}
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keys_delete(response_keys);
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pdu_delete(response);
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log_debugx("removing temporary discovery session");
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kernel_remove(conn);
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#ifdef ICL_KERNEL_PROXY
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if (conn->conn_conf.isc_iser == 1) {
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/*
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* If we're going through the proxy, the kernel already
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* sent Logout PDU for us and destroyed the session,
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* so we can't send anything anymore.
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*/
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log_debugx("discovery session done");
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return;
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}
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#endif
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log_debugx("discovery done; logging out");
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request = logout_new_request(conn);
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pdu_send(request);
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pdu_delete(request);
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request = NULL;
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log_debugx("waiting for Logout Response");
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response = logout_receive(conn);
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pdu_delete(response);
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log_debugx("discovery session done");
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}
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