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kernel-fxtec-pro1x/drivers/target/iscsi/iscsi_target_nego.c
Jörn Engel 8359cf43b9 target: remove useless casts 
A reader should spend an extra moment whenever noticing a cast,
because either something special is going on that deserves extra
attention or, as is all too often the case, the code is wrong.

These casts, afaics, have all been useless.  They cast a foo* to a
foo*, cast a void* to the assigned type, cast a foo* to void*, before
assigning it to a void* variable, etc.

In a few cases I also removed an additional &...[0], which is equally
useless.

Lastly I added three FIXMEs where, to the best of my judgement, the
code appears to have a bug.  It would be good if someone could check
these.

Signed-off-by: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-12-14 11:28:07 +00:00

1066 lines
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/*******************************************************************************
* 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] = ';';
}
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 exeeds 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, rsp_csg, rsp_nsg;
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);
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;
rsp_csg = (login_rsp->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK);
rsp_nsg = (login_rsp->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 = cpu_to_be32(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, ntohl(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;
login_rsp->tsih = be16_to_cpu(login_rsp->tsih);
login_rsp->itt = be32_to_cpu(login_rsp->itt);
login_rsp->statsn = be32_to_cpu(login_rsp->statsn);
mutex_lock(&sess->cmdsn_mutex);
login_rsp->exp_cmdsn = be32_to_cpu(sess->exp_cmd_sn);
login_rsp->max_cmdsn = be32_to_cpu(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);
login_req->tsih = be16_to_cpu(login_req->tsih);
login_req->itt = be32_to_cpu(login_req->itt);
login_req->cid = be16_to_cpu(login_req->cid);
login_req->cmdsn = be32_to_cpu(login_req->cmdsn);
login_req->exp_statsn = be32_to_cpu(login_req->exp_statsn);
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->param_list);
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->param_list);
if (ret < 0)
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)
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;
struct iscsi_targ_login_rsp *login_rsp;
u32 payload_length;
int sessiontype = 0, ret = 0;
login_req = (struct iscsi_login_req *) login->req;
login_rsp = (struct iscsi_targ_login_rsp *) login->rsp;
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 = login_req->cmdsn;
login->init_task_tag = login_req->itt;
login->initial_exp_statsn = login_req->exp_statsn;
login->cid = login_req->cid;
login->tsih = 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) {
pr_err("iSCSI Login negotiation failed.\n");
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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