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kernel-fxtec-pro1x/drivers/target/iscsi/iscsi_target_nego.c
Roland Dreier 1c5c12c666 iscsi-target: Always send a response before terminating iSCSI connection 
There are some cases, for example when the initiator sends an
out-of-bounds ErrorRecoveryLevel value, where the iSCSI target
terminates the connection without sending back any error.  Audit the
login path and add appropriate iscsit_tx_login_rsp() calls to make
sure this doesn't happen.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2012-11-07 20:12:08 -08:00

1057 lines
27 KiB
C
Raw Blame History

/*******************************************************************************
* This file contains main functions related to iSCSI Parameter negotiation.
*
* \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
*
* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
*
* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
******************************************************************************/
#include <linux/ctype.h>
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include "iscsi_target_core.h"
#include "iscsi_target_parameters.h"
#include "iscsi_target_login.h"
#include "iscsi_target_nego.h"
#include "iscsi_target_tpg.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
#include "iscsi_target_auth.h"
#define MAX_LOGIN_PDUS 7
#define TEXT_LEN 4096
void convert_null_to_semi(char *buf, int len)
{
int i;
for (i = 0; i < len; i++)
if (buf[i] == '\0')
buf[i] = ';';
}
static int strlen_semi(char *buf)
{
int i = 0;
while (buf[i] != '\0') {
if (buf[i] == ';')
return i;
i++;
}
return -1;
}
int extract_param(
const char *in_buf,
const char *pattern,
unsigned int max_length,
char *out_buf,
unsigned char *type)
{
char *ptr;
int len;
if (!in_buf || !pattern || !out_buf || !type)
return -1;
ptr = strstr(in_buf, pattern);
if (!ptr)
return -1;
ptr = strstr(ptr, "=");
if (!ptr)
return -1;
ptr += 1;
if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
ptr += 2; /* skip 0x */
*type = HEX;
} else
*type = DECIMAL;
len = strlen_semi(ptr);
if (len < 0)
return -1;
if (len > max_length) {
pr_err("Length of input: %d exceeds max_length:"
" %d\n", len, max_length);
return -1;
}
memcpy(out_buf, ptr, len);
out_buf[len] = '\0';
return 0;
}
static u32 iscsi_handle_authentication(
struct iscsi_conn *conn,
char *in_buf,
char *out_buf,
int in_length,
int *out_length,
unsigned char *authtype)
{
struct iscsi_session *sess = conn->sess;
struct iscsi_node_auth *auth;
struct iscsi_node_acl *iscsi_nacl;
struct se_node_acl *se_nacl;
if (!sess->sess_ops->SessionType) {
/*
* For SessionType=Normal
*/
se_nacl = conn->sess->se_sess->se_node_acl;
if (!se_nacl) {
pr_err("Unable to locate struct se_node_acl for"
" CHAP auth\n");
return -1;
}
iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
se_node_acl);
if (!iscsi_nacl) {
pr_err("Unable to locate struct iscsi_node_acl for"
" CHAP auth\n");
return -1;
}
auth = ISCSI_NODE_AUTH(iscsi_nacl);
} else {
/*
* For SessionType=Discovery
*/
auth = &iscsit_global->discovery_acl.node_auth;
}
if (strstr("CHAP", authtype))
strcpy(conn->sess->auth_type, "CHAP");
else
strcpy(conn->sess->auth_type, NONE);
if (strstr("None", authtype))
return 1;
#ifdef CANSRP
else if (strstr("SRP", authtype))
return srp_main_loop(conn, auth, in_buf, out_buf,
&in_length, out_length);
#endif
else if (strstr("CHAP", authtype))
return chap_main_loop(conn, auth, in_buf, out_buf,
&in_length, out_length);
else if (strstr("SPKM1", authtype))
return 2;
else if (strstr("SPKM2", authtype))
return 2;
else if (strstr("KRB5", authtype))
return 2;
else
return 2;
}
static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
{
kfree(conn->auth_protocol);
}
static int iscsi_target_check_login_request(
struct iscsi_conn *conn,
struct iscsi_login *login)
{
int req_csg, req_nsg;
u32 payload_length;
struct iscsi_login_req *login_req;
login_req = (struct iscsi_login_req *) login->req;
payload_length = ntoh24(login_req->dlength);
switch (login_req->opcode & ISCSI_OPCODE_MASK) {
case ISCSI_OP_LOGIN:
break;
default:
pr_err("Received unknown opcode 0x%02x.\n",
login_req->opcode & ISCSI_OPCODE_MASK);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
(login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
" and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
req_csg = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK);
if (req_csg != login->current_stage) {
pr_err("Initiator unexpectedly changed login stage"
" from %d to %d, login failed.\n", login->current_stage,
req_csg);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
if ((req_nsg == 2) || (req_csg >= 2) ||
((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
(req_nsg <= req_csg))) {
pr_err("Illegal login_req->flags Combination, CSG: %d,"
" NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
if ((login_req->max_version != login->version_max) ||
(login_req->min_version != login->version_min)) {
pr_err("Login request changed Version Max/Nin"
" unexpectedly to 0x%02x/0x%02x, protocol error\n",
login_req->max_version, login_req->min_version);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
if (memcmp(login_req->isid, login->isid, 6) != 0) {
pr_err("Login request changed ISID unexpectedly,"
" protocol error.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
if (login_req->itt != login->init_task_tag) {
pr_err("Login request changed ITT unexpectedly to"
" 0x%08x, protocol error.\n", login_req->itt);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
if (payload_length > MAX_KEY_VALUE_PAIRS) {
pr_err("Login request payload exceeds default"
" MaxRecvDataSegmentLength: %u, protocol error.\n",
MAX_KEY_VALUE_PAIRS);
return -1;
}
return 0;
}
static int iscsi_target_check_first_request(
struct iscsi_conn *conn,
struct iscsi_login *login)
{
struct iscsi_param *param = NULL;
struct se_node_acl *se_nacl;
login->first_request = 0;
list_for_each_entry(param, &conn->param_list->param_list, p_list) {
if (!strncmp(param->name, SESSIONTYPE, 11)) {
if (!IS_PSTATE_ACCEPTOR(param)) {
pr_err("SessionType key not received"
" in first login request.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_MISSING_FIELDS);
return -1;
}
if (!strncmp(param->value, DISCOVERY, 9))
return 0;
}
if (!strncmp(param->name, INITIATORNAME, 13)) {
if (!IS_PSTATE_ACCEPTOR(param)) {
if (!login->leading_connection)
continue;
pr_err("InitiatorName key not received"
" in first login request.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_MISSING_FIELDS);
return -1;
}
/*
* For non-leading connections, double check that the
* received InitiatorName matches the existing session's
* struct iscsi_node_acl.
*/
if (!login->leading_connection) {
se_nacl = conn->sess->se_sess->se_node_acl;
if (!se_nacl) {
pr_err("Unable to locate"
" struct se_node_acl\n");
iscsit_tx_login_rsp(conn,
ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
return -1;
}
if (strcmp(param->value,
se_nacl->initiatorname)) {
pr_err("Incorrect"
" InitiatorName: %s for this"
" iSCSI Initiator Node.\n",
param->value);
iscsit_tx_login_rsp(conn,
ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
return -1;
}
}
}
}
return 0;
}
static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
{
u32 padding = 0;
struct iscsi_session *sess = conn->sess;
struct iscsi_login_rsp *login_rsp;
login_rsp = (struct iscsi_login_rsp *) login->rsp;
login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
hton24(login_rsp->dlength, login->rsp_length);
memcpy(login_rsp->isid, login->isid, 6);
login_rsp->tsih = cpu_to_be16(login->tsih);
login_rsp->itt = login->init_task_tag;
login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
" ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
" %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
ntohl(login_rsp->statsn), login->rsp_length);
padding = ((-login->rsp_length) & 3);
if (iscsi_login_tx_data(
conn,
login->rsp,
login->rsp_buf,
login->rsp_length + padding) < 0)
return -1;
login->rsp_length = 0;
mutex_lock(&sess->cmdsn_mutex);
login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn);
login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn);
mutex_unlock(&sess->cmdsn_mutex);
return 0;
}
static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
{
u32 padding = 0, payload_length;
struct iscsi_login_req *login_req;
if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
return -1;
login_req = (struct iscsi_login_req *) login->req;
payload_length = ntoh24(login_req->dlength);
pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
" CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
login_req->flags, login_req->itt, login_req->cmdsn,
login_req->exp_statsn, login_req->cid, payload_length);
if (iscsi_target_check_login_request(conn, login) < 0)
return -1;
padding = ((-payload_length) & 3);
memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
if (iscsi_login_rx_data(
conn,
login->req_buf,
payload_length + padding) < 0)
return -1;
return 0;
}
static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
{
if (iscsi_target_do_tx_login_io(conn, login) < 0)
return -1;
if (iscsi_target_do_rx_login_io(conn, login) < 0)
return -1;
return 0;
}
static int iscsi_target_get_initial_payload(
struct iscsi_conn *conn,
struct iscsi_login *login)
{
u32 padding = 0, payload_length;
struct iscsi_login_req *login_req;
login_req = (struct iscsi_login_req *) login->req;
payload_length = ntoh24(login_req->dlength);
pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
" CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
login_req->flags, login_req->itt, login_req->cmdsn,
login_req->exp_statsn, payload_length);
if (iscsi_target_check_login_request(conn, login) < 0)
return -1;
padding = ((-payload_length) & 3);
if (iscsi_login_rx_data(
conn,
login->req_buf,
payload_length + padding) < 0)
return -1;
return 0;
}
/*
* NOTE: We check for existing sessions or connections AFTER the initiator
* has been successfully authenticated in order to protect against faked
* ISID/TSIH combinations.
*/
static int iscsi_target_check_for_existing_instances(
struct iscsi_conn *conn,
struct iscsi_login *login)
{
if (login->checked_for_existing)
return 0;
login->checked_for_existing = 1;
if (!login->tsih)
return iscsi_check_for_session_reinstatement(conn);
else
return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
login->initial_exp_statsn);
}
static int iscsi_target_do_authentication(
struct iscsi_conn *conn,
struct iscsi_login *login)
{
int authret;
u32 payload_length;
struct iscsi_param *param;
struct iscsi_login_req *login_req;
struct iscsi_login_rsp *login_rsp;
login_req = (struct iscsi_login_req *) login->req;
login_rsp = (struct iscsi_login_rsp *) login->rsp;
payload_length = ntoh24(login_req->dlength);
param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
if (!param)
return -1;
authret = iscsi_handle_authentication(
conn,
login->req_buf,
login->rsp_buf,
payload_length,
&login->rsp_length,
param->value);
switch (authret) {
case 0:
pr_debug("Received OK response"
" from LIO Authentication, continuing.\n");
break;
case 1:
pr_debug("iSCSI security negotiation"
" completed successfully.\n");
login->auth_complete = 1;
if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
(login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
ISCSI_FLAG_LOGIN_TRANSIT);
login->current_stage = 1;
}
return iscsi_target_check_for_existing_instances(
conn, login);
case 2:
pr_err("Security negotiation"
" failed.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_AUTH_FAILED);
return -1;
default:
pr_err("Received unknown error %d from LIO"
" Authentication\n", authret);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_TARGET_ERROR);
return -1;
}
return 0;
}
static int iscsi_target_handle_csg_zero(
struct iscsi_conn *conn,
struct iscsi_login *login)
{
int ret;
u32 payload_length;
struct iscsi_param *param;
struct iscsi_login_req *login_req;
struct iscsi_login_rsp *login_rsp;
login_req = (struct iscsi_login_req *) login->req;
login_rsp = (struct iscsi_login_rsp *) login->rsp;
payload_length = ntoh24(login_req->dlength);
param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
if (!param)
return -1;
ret = iscsi_decode_text_input(
PHASE_SECURITY|PHASE_DECLARATIVE,
SENDER_INITIATOR|SENDER_RECEIVER,
login->req_buf,
payload_length,
conn);
if (ret < 0)
return -1;
if (ret > 0) {
if (login->auth_complete) {
pr_err("Initiator has already been"
" successfully authenticated, but is still"
" sending %s keys.\n", param->value);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
goto do_auth;
}
if (login->first_request)
if (iscsi_target_check_first_request(conn, login) < 0)
return -1;
ret = iscsi_encode_text_output(
PHASE_SECURITY|PHASE_DECLARATIVE,
SENDER_TARGET,
login->rsp_buf,
&login->rsp_length,
conn->param_list);
if (ret < 0)
return -1;
if (!iscsi_check_negotiated_keys(conn->param_list)) {
if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
!strncmp(param->value, NONE, 4)) {
pr_err("Initiator sent AuthMethod=None but"
" Target is enforcing iSCSI Authentication,"
" login failed.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_AUTH_FAILED);
return -1;
}
if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
!login->auth_complete)
return 0;
if (strncmp(param->value, NONE, 4) && !login->auth_complete)
return 0;
if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
(login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
ISCSI_FLAG_LOGIN_TRANSIT;
login->current_stage = 1;
}
}
return 0;
do_auth:
return iscsi_target_do_authentication(conn, login);
}
static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
{
int ret;
u32 payload_length;
struct iscsi_login_req *login_req;
struct iscsi_login_rsp *login_rsp;
login_req = (struct iscsi_login_req *) login->req;
login_rsp = (struct iscsi_login_rsp *) login->rsp;
payload_length = ntoh24(login_req->dlength);
ret = iscsi_decode_text_input(
PHASE_OPERATIONAL|PHASE_DECLARATIVE,
SENDER_INITIATOR|SENDER_RECEIVER,
login->req_buf,
payload_length,
conn);
if (ret < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
if (login->first_request)
if (iscsi_target_check_first_request(conn, login) < 0)
return -1;
if (iscsi_target_check_for_existing_instances(conn, login) < 0)
return -1;
ret = iscsi_encode_text_output(
PHASE_OPERATIONAL|PHASE_DECLARATIVE,
SENDER_TARGET,
login->rsp_buf,
&login->rsp_length,
conn->param_list);
if (ret < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_INIT_ERR);
return -1;
}
if (!login->auth_complete &&
ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) {
pr_err("Initiator is requesting CSG: 1, has not been"
" successfully authenticated, and the Target is"
" enforcing iSCSI Authentication, login failed.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_AUTH_FAILED);
return -1;
}
if (!iscsi_check_negotiated_keys(conn->param_list))
if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
(login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
ISCSI_FLAG_LOGIN_TRANSIT;
return 0;
}
static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
{
int pdu_count = 0;
struct iscsi_login_req *login_req;
struct iscsi_login_rsp *login_rsp;
login_req = (struct iscsi_login_req *) login->req;
login_rsp = (struct iscsi_login_rsp *) login->rsp;
while (1) {
if (++pdu_count > MAX_LOGIN_PDUS) {
pr_err("MAX_LOGIN_PDUS count reached.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_TARGET_ERROR);
return -1;
}
switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) {
case 0:
login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK);
if (iscsi_target_handle_csg_zero(conn, login) < 0)
return -1;
break;
case 1:
login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
if (iscsi_target_handle_csg_one(conn, login) < 0)
return -1;
if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
login->tsih = conn->sess->tsih;
if (iscsi_target_do_tx_login_io(conn,
login) < 0)
return -1;
return 0;
}
break;
default:
pr_err("Illegal CSG: %d received from"
" Initiator, protocol error.\n",
(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
>> 2);
break;
}
if (iscsi_target_do_login_io(conn, login) < 0)
return -1;
if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
}
}
return 0;
}
static void iscsi_initiatorname_tolower(
char *param_buf)
{
char *c;
u32 iqn_size = strlen(param_buf), i;
for (i = 0; i < iqn_size; i++) {
c = &param_buf[i];
if (!isupper(*c))
continue;
*c = tolower(*c);
}
}
/*
* Processes the first Login Request..
*/
static int iscsi_target_locate_portal(
struct iscsi_np *np,
struct iscsi_conn *conn,
struct iscsi_login *login)
{
char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
struct iscsi_session *sess = conn->sess;
struct iscsi_tiqn *tiqn;
struct iscsi_login_req *login_req;
u32 payload_length;
int sessiontype = 0, ret = 0;
login_req = (struct iscsi_login_req *) login->req;
payload_length = ntoh24(login_req->dlength);
login->first_request = 1;
login->leading_connection = (!login_req->tsih) ? 1 : 0;
login->current_stage =
(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
login->version_min = login_req->min_version;
login->version_max = login_req->max_version;
memcpy(login->isid, login_req->isid, 6);
login->cmd_sn = be32_to_cpu(login_req->cmdsn);
login->init_task_tag = login_req->itt;
login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
login->cid = be16_to_cpu(login_req->cid);
login->tsih = be16_to_cpu(login_req->tsih);
if (iscsi_target_get_initial_payload(conn, login) < 0)
return -1;
tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
if (!tmpbuf) {
pr_err("Unable to allocate memory for tmpbuf.\n");
return -1;
}
memcpy(tmpbuf, login->req_buf, payload_length);
tmpbuf[payload_length] = '\0';
start = tmpbuf;
end = (start + payload_length);
/*
* Locate the initial keys expected from the Initiator node in
* the first login request in order to progress with the login phase.
*/
while (start < end) {
if (iscsi_extract_key_value(start, &key, &value) < 0) {
ret = -1;
goto out;
}
if (!strncmp(key, "InitiatorName", 13))
i_buf = value;
else if (!strncmp(key, "SessionType", 11))
s_buf = value;
else if (!strncmp(key, "TargetName", 10))
t_buf = value;
start += strlen(key) + strlen(value) + 2;
}
/*
* See 5.3. Login Phase.
*/
if (!i_buf) {
pr_err("InitiatorName key not received"
" in first login request.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_MISSING_FIELDS);
ret = -1;
goto out;
}
/*
* Convert the incoming InitiatorName to lowercase following
* RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
* are NOT case sensitive.
*/
iscsi_initiatorname_tolower(i_buf);
if (!s_buf) {
if (!login->leading_connection)
goto get_target;
pr_err("SessionType key not received"
" in first login request.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_MISSING_FIELDS);
ret = -1;
goto out;
}
/*
* Use default portal group for discovery sessions.
*/
sessiontype = strncmp(s_buf, DISCOVERY, 9);
if (!sessiontype) {
conn->tpg = iscsit_global->discovery_tpg;
if (!login->leading_connection)
goto get_target;
sess->sess_ops->SessionType = 1;
/*
* Setup crc32c modules from libcrypto
*/
if (iscsi_login_setup_crypto(conn) < 0) {
pr_err("iscsi_login_setup_crypto() failed\n");
ret = -1;
goto out;
}
/*
* Serialize access across the discovery struct iscsi_portal_group to
* process login attempt.
*/
if (iscsit_access_np(np, conn->tpg) < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
ret = -1;
goto out;
}
ret = 0;
goto out;
}
get_target:
if (!t_buf) {
pr_err("TargetName key not received"
" in first login request while"
" SessionType=Normal.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_MISSING_FIELDS);
ret = -1;
goto out;
}
/*
* Locate Target IQN from Storage Node.
*/
tiqn = iscsit_get_tiqn_for_login(t_buf);
if (!tiqn) {
pr_err("Unable to locate Target IQN: %s in"
" Storage Node\n", t_buf);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
ret = -1;
goto out;
}
pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
/*
* Locate Target Portal Group from Storage Node.
*/
conn->tpg = iscsit_get_tpg_from_np(tiqn, np);
if (!conn->tpg) {
pr_err("Unable to locate Target Portal Group"
" on %s\n", tiqn->tiqn);
iscsit_put_tiqn_for_login(tiqn);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
ret = -1;
goto out;
}
pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
/*
* Setup crc32c modules from libcrypto
*/
if (iscsi_login_setup_crypto(conn) < 0) {
pr_err("iscsi_login_setup_crypto() failed\n");
ret = -1;
goto out;
}
/*
* Serialize access across the struct iscsi_portal_group to
* process login attempt.
*/
if (iscsit_access_np(np, conn->tpg) < 0) {
iscsit_put_tiqn_for_login(tiqn);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
ret = -1;
conn->tpg = NULL;
goto out;
}
/*
* conn->sess->node_acl will be set when the referenced
* struct iscsi_session is located from received ISID+TSIH in
* iscsi_login_non_zero_tsih_s2().
*/
if (!login->leading_connection) {
ret = 0;
goto out;
}
/*
* This value is required in iscsi_login_zero_tsih_s2()
*/
sess->sess_ops->SessionType = 0;
/*
* Locate incoming Initiator IQN reference from Storage Node.
*/
sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
&conn->tpg->tpg_se_tpg, i_buf);
if (!sess->se_sess->se_node_acl) {
pr_err("iSCSI Initiator Node: %s is not authorized to"
" access iSCSI target portal group: %hu.\n",
i_buf, conn->tpg->tpgt);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
ret = -1;
goto out;
}
ret = 0;
out:
kfree(tmpbuf);
return ret;
}
struct iscsi_login *iscsi_target_init_negotiation(
struct iscsi_np *np,
struct iscsi_conn *conn,
char *login_pdu)
{
struct iscsi_login *login;
login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
if (!login) {
pr_err("Unable to allocate memory for struct iscsi_login.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return NULL;
}
login->req = kmemdup(login_pdu, ISCSI_HDR_LEN, GFP_KERNEL);
if (!login->req) {
pr_err("Unable to allocate memory for Login Request.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
goto out;
}
login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
if (!login->req_buf) {
pr_err("Unable to allocate memory for response buffer.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
goto out;
}
/*
* SessionType: Discovery
*
* Locates Default Portal
*
* SessionType: Normal
*
* Locates Target Portal from NP -> Target IQN
*/
if (iscsi_target_locate_portal(np, conn, login) < 0) {
goto out;
}
return login;
out:
kfree(login->req);
kfree(login->req_buf);
kfree(login);
return NULL;
}
int iscsi_target_start_negotiation(
struct iscsi_login *login,
struct iscsi_conn *conn)
{
int ret = -1;
login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
if (!login->rsp) {
pr_err("Unable to allocate memory for"
" Login Response.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
ret = -1;
goto out;
}
login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
if (!login->rsp_buf) {
pr_err("Unable to allocate memory for"
" request buffer.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
ret = -1;
goto out;
}
ret = iscsi_target_do_login(conn, login);
out:
if (ret != 0)
iscsi_remove_failed_auth_entry(conn);
iscsi_target_nego_release(login, conn);
return ret;
}
void iscsi_target_nego_release(
struct iscsi_login *login,
struct iscsi_conn *conn)
{
kfree(login->req);
kfree(login->rsp);
kfree(login->req_buf);
kfree(login->rsp_buf);
kfree(login);
}
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