2124e3b07f
While we don't support MCS, hole in received sequence numbers may mean only PDU loss. While we don't support lost PDU recovery, terminate the connection to avoid stuck commands. While there, improve handling of sequence numbers wrap after 2^32 PDUs. MFC after: 2 weeks
331 lines
10 KiB
C
331 lines
10 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 <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 <netdb.h>
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#include <sys/socket.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 (ISCSI_SNLT(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 %u, is %u", 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 %u, should be %u", 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 (ISCSI_SNLT(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 %u, is %u", 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 %u, should be %u", 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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static void
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discovery_add_target(struct keys *response_keys, const struct target *targ)
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{
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struct portal *portal;
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char *buf;
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char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
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struct addrinfo *ai;
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int ret;
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keys_add(response_keys, "TargetName", targ->t_name);
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TAILQ_FOREACH(portal, &targ->t_portal_group->pg_portals, p_next) {
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ai = portal->p_ai;
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ret = getnameinfo(ai->ai_addr, ai->ai_addrlen,
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hbuf, sizeof(hbuf), sbuf, sizeof(sbuf),
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (ret != 0) {
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log_warnx("getnameinfo: %s", gai_strerror(ret));
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continue;
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}
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switch (ai->ai_addr->sa_family) {
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case AF_INET:
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if (strcmp(hbuf, "0.0.0.0") == 0)
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continue;
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ret = asprintf(&buf, "%s:%s,%d", hbuf, sbuf,
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targ->t_portal_group->pg_tag);
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break;
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case AF_INET6:
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if (strcmp(hbuf, "::") == 0)
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continue;
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ret = asprintf(&buf, "[%s]:%s,%d", hbuf, sbuf,
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targ->t_portal_group->pg_tag);
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break;
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default:
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continue;
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}
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if (ret <= 0)
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log_err(1, "asprintf");
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keys_add(response_keys, "TargetAddress", buf);
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free(buf);
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}
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}
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static bool
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discovery_target_filtered_out(const struct connection *conn,
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const struct target *targ)
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{
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const struct auth_group *ag;
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const struct portal_group *pg;
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const struct auth *auth;
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int error;
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ag = targ->t_auth_group;
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pg = conn->conn_portal->p_portal_group;
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assert(pg->pg_discovery_auth_group != PG_FILTER_UNKNOWN);
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if (pg->pg_discovery_filter >= PG_FILTER_PORTAL &&
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auth_portal_check(ag, &conn->conn_initiator_sa) != 0) {
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log_debugx("initiator does not match initiator portals "
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"allowed for target \"%s\"; skipping", targ->t_name);
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return (true);
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}
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if (pg->pg_discovery_filter >= PG_FILTER_PORTAL_NAME &&
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auth_name_check(ag, conn->conn_initiator_name) != 0) {
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log_debugx("initiator does not match initiator names "
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"allowed for target \"%s\"; skipping", targ->t_name);
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return (true);
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}
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if (pg->pg_discovery_filter >= PG_FILTER_PORTAL_NAME_AUTH &&
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ag->ag_type != AG_TYPE_NO_AUTHENTICATION) {
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if (conn->conn_chap == NULL) {
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assert(pg->pg_discovery_auth_group->ag_type ==
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AG_TYPE_NO_AUTHENTICATION);
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log_debugx("initiator didn't authenticate, but target "
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"\"%s\" requires CHAP; skipping", targ->t_name);
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return (true);
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}
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assert(conn->conn_user != NULL);
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auth = auth_find(ag, conn->conn_user);
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if (auth == NULL) {
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log_debugx("CHAP user \"%s\" doesn't match target "
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"\"%s\"; skipping", conn->conn_user, targ->t_name);
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return (true);
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}
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error = chap_authenticate(conn->conn_chap, auth->a_secret);
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if (error != 0) {
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log_debugx("password for CHAP user \"%s\" doesn't "
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"match target \"%s\"; skipping",
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conn->conn_user, targ->t_name);
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return (true);
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}
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}
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return (false);
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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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const struct portal_group *pg;
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const struct target *targ;
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const char *send_targets;
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pg = conn->conn_portal->p_portal_group;
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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, &pg->pg_conf->conf_targets, t_next) {
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if (targ->t_portal_group != pg) {
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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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if (discovery_target_filtered_out(conn, targ)) {
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/* Ignore this target. */
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continue;
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}
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discovery_add_target(response_keys, targ);
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}
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} else {
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targ = target_find(pg->pg_conf, 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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if (discovery_target_filtered_out(conn, targ)) {
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/* Ignore this target. */
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} else {
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discovery_add_target(response_keys, targ);
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}
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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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