From a1325b1bccc31f16d6da5cff46dd722ab620b361 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Fri, 7 Jul 2017 14:45:49 -0700 Subject: iscsi-target: Add login_keys_workaround attribute for non RFC initiators commit 138d351eefb727ab9e41a3dc5f112ceb4f6e59f2 upstream. This patch re-introduces part of a long standing login workaround that was recently dropped by: commit 1c99de981f30b3e7868b8d20ce5479fa1c0fea46 Author: Nicholas Bellinger Date: Sun Apr 2 13:36:44 2017 -0700 iscsi-target: Drop work-around for legacy GlobalSAN initiator Namely, the workaround for FirstBurstLength ended up being required by Mellanox Flexboot PXE boot ROMs as reported by Robert. So this patch re-adds the work-around for FirstBurstLength within iscsi_check_proposer_for_optional_reply(), and makes the key optional to respond when the initiator does not propose, nor respond to it. Also as requested by Arun, this patch introduces a new TPG attribute named 'login_keys_workaround' that controls the use of both the FirstBurstLength workaround, as well as the two other existing workarounds for gPXE iSCSI boot client. By default, the workaround is enabled with login_keys_workaround=1, since Mellanox FlexBoot requires it, and Arun has verified the Qlogic MSFT initiator already proposes FirstBurstLength, so it's uneffected by this re-adding this part of the original work-around. Reported-by: Robert LeBlanc Cc: Robert LeBlanc Reviewed-by: Arun Easi Signed-off-by: Nicholas Bellinger [bwh: Backported to 3.16: - Use DEF_TPG_ATTRIB() + TPG_ATTR() to define the attribute - Adjust context] Signed-off-by: Ben Hutchings --- drivers/target/iscsi/iscsi_target_configfs.c | 3 ++ drivers/target/iscsi/iscsi_target_core.h | 9 ++++++ drivers/target/iscsi/iscsi_target_nego.c | 6 ++-- drivers/target/iscsi/iscsi_target_parameters.c | 41 ++++++++++++++++++-------- drivers/target/iscsi/iscsi_target_parameters.h | 2 +- drivers/target/iscsi/iscsi_target_tpg.c | 19 ++++++++++++ drivers/target/iscsi/iscsi_target_tpg.h | 1 + 7 files changed, 65 insertions(+), 16 deletions(-) diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c index e7785e29a858..425e4c7969e9 100644 --- a/drivers/target/iscsi/iscsi_target_configfs.c +++ b/drivers/target/iscsi/iscsi_target_configfs.c @@ -1057,6 +1057,8 @@ TPG_ATTR(default_erl, S_IRUGO | S_IWUSR); */ DEF_TPG_ATTRIB(t10_pi); TPG_ATTR(t10_pi, S_IRUGO | S_IWUSR); +DEF_TPG_ATTRIB(login_keys_workaround); +TPG_ATTR(login_keys_workaround, S_IRUGO | S_IWUSR); static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = { &iscsi_tpg_attrib_authentication.attr, @@ -1070,6 +1072,7 @@ static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = { &iscsi_tpg_attrib_demo_mode_discovery.attr, &iscsi_tpg_attrib_default_erl.attr, &iscsi_tpg_attrib_t10_pi.attr, + &iscsi_tpg_attrib_login_keys_workaround.attr, NULL, }; diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h index 1863de28ce46..f8e14dda29f6 100644 --- a/drivers/target/iscsi/iscsi_target_core.h +++ b/drivers/target/iscsi/iscsi_target_core.h @@ -60,6 +60,14 @@ #define TA_CACHE_CORE_NPS 0 /* T10 protection information disabled by default */ #define TA_DEFAULT_T10_PI 0 +/* + * Used to control the sending of keys with optional to respond state bit, + * as a workaround for non RFC compliant initiators,that do not propose, + * nor respond to specific keys required for login to complete. + * + * See iscsi_check_proposer_for_optional_reply() for more details. + */ +#define TA_DEFAULT_LOGIN_KEYS_WORKAROUND 1 #define ISCSI_IOV_DATA_BUFFER 5 @@ -774,6 +782,7 @@ struct iscsi_tpg_attrib { u32 demo_mode_discovery; u32 default_erl; u8 t10_pi; + u32 login_keys_workaround; struct iscsi_portal_group *tpg; }; diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c index c15cfcb3fcc9..d2d4b5010447 100644 --- a/drivers/target/iscsi/iscsi_target_nego.c +++ b/drivers/target/iscsi/iscsi_target_nego.c @@ -887,7 +887,8 @@ static int iscsi_target_handle_csg_zero( SENDER_TARGET, login->rsp_buf, &login->rsp_length, - conn->param_list); + conn->param_list, + conn->tpg->tpg_attrib.login_keys_workaround); if (ret < 0) return -1; @@ -957,7 +958,8 @@ static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_log SENDER_TARGET, login->rsp_buf, &login->rsp_length, - conn->param_list); + conn->param_list, + conn->tpg->tpg_attrib.login_keys_workaround); if (ret < 0) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, ISCSI_LOGIN_STATUS_INIT_ERR); diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c index 578f5d03d84e..070dc042d250 100644 --- a/drivers/target/iscsi/iscsi_target_parameters.c +++ b/drivers/target/iscsi/iscsi_target_parameters.c @@ -787,7 +787,8 @@ static int iscsi_check_for_auth_key(char *key) return 0; } -static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param) +static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param, + bool keys_workaround) { if (IS_TYPE_BOOL_AND(param)) { if (!strcmp(param->value, NO)) @@ -795,19 +796,31 @@ static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param) } else if (IS_TYPE_BOOL_OR(param)) { if (!strcmp(param->value, YES)) SET_PSTATE_REPLY_OPTIONAL(param); - /* - * Required for gPXE iSCSI boot client - */ - if (!strcmp(param->name, IMMEDIATEDATA)) - SET_PSTATE_REPLY_OPTIONAL(param); + + if (keys_workaround) { + /* + * Required for gPXE iSCSI boot client + */ + if (!strcmp(param->name, IMMEDIATEDATA)) + SET_PSTATE_REPLY_OPTIONAL(param); + } } else if (IS_TYPE_NUMBER(param)) { if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) SET_PSTATE_REPLY_OPTIONAL(param); - /* - * Required for gPXE iSCSI boot client - */ - if (!strcmp(param->name, MAXCONNECTIONS)) - SET_PSTATE_REPLY_OPTIONAL(param); + + if (keys_workaround) { + /* + * Required for Mellanox Flexboot PXE boot ROM + */ + if (!strcmp(param->name, FIRSTBURSTLENGTH)) + SET_PSTATE_REPLY_OPTIONAL(param); + + /* + * Required for gPXE iSCSI boot client + */ + if (!strcmp(param->name, MAXCONNECTIONS)) + SET_PSTATE_REPLY_OPTIONAL(param); + } } else if (IS_PHASE_DECLARATIVE(param)) SET_PSTATE_REPLY_OPTIONAL(param); } @@ -1657,7 +1670,8 @@ int iscsi_encode_text_output( u8 sender, char *textbuf, u32 *length, - struct iscsi_param_list *param_list) + struct iscsi_param_list *param_list, + bool keys_workaround) { char *output_buf = NULL; struct iscsi_extra_response *er; @@ -1693,7 +1707,8 @@ int iscsi_encode_text_output( *length += 1; output_buf = textbuf + *length; SET_PSTATE_PROPOSER(param); - iscsi_check_proposer_for_optional_reply(param); + iscsi_check_proposer_for_optional_reply(param, + keys_workaround); pr_debug("Sending key: %s=%s\n", param->name, param->value); } diff --git a/drivers/target/iscsi/iscsi_target_parameters.h b/drivers/target/iscsi/iscsi_target_parameters.h index a47046a752aa..f430a0eba0f8 100644 --- a/drivers/target/iscsi/iscsi_target_parameters.h +++ b/drivers/target/iscsi/iscsi_target_parameters.h @@ -40,7 +40,7 @@ extern int iscsi_extract_key_value(char *, char **, char **); extern int iscsi_update_param_value(struct iscsi_param *, char *); extern int iscsi_decode_text_input(u8, u8, char *, u32, struct iscsi_conn *); extern int iscsi_encode_text_output(u8, u8, char *, u32 *, - struct iscsi_param_list *); + struct iscsi_param_list *, bool); extern int iscsi_check_negotiated_keys(struct iscsi_param_list *); extern void iscsi_set_connection_parameters(struct iscsi_conn_ops *, struct iscsi_param_list *); diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c index 48cd3cf741df..79ca361078b8 100644 --- a/drivers/target/iscsi/iscsi_target_tpg.c +++ b/drivers/target/iscsi/iscsi_target_tpg.c @@ -228,6 +228,7 @@ static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *tpg) a->demo_mode_discovery = TA_DEMO_MODE_DISCOVERY; a->default_erl = TA_DEFAULT_ERL; a->t10_pi = TA_DEFAULT_T10_PI; + a->login_keys_workaround = TA_DEFAULT_LOGIN_KEYS_WORKAROUND; } int iscsit_tpg_add_portal_group(struct iscsi_tiqn *tiqn, struct iscsi_portal_group *tpg) @@ -878,3 +879,21 @@ int iscsit_ta_t10_pi( return 0; } + +int iscsit_ta_login_keys_workaround( + struct iscsi_portal_group *tpg, + u32 flag) +{ + struct iscsi_tpg_attrib *a = &tpg->tpg_attrib; + + if ((flag != 0) && (flag != 1)) { + pr_err("Illegal value %d\n", flag); + return -EINVAL; + } + + a->login_keys_workaround = flag; + pr_debug("iSCSI_TPG[%hu] - TPG enabled bit for login keys workaround: %s ", + tpg->tpgt, (a->login_keys_workaround) ? "ON" : "OFF"); + + return 0; +} diff --git a/drivers/target/iscsi/iscsi_target_tpg.h b/drivers/target/iscsi/iscsi_target_tpg.h index e7265337bc43..49b869fab102 100644 --- a/drivers/target/iscsi/iscsi_target_tpg.h +++ b/drivers/target/iscsi/iscsi_target_tpg.h @@ -39,5 +39,6 @@ extern int iscsit_ta_prod_mode_write_protect(struct iscsi_portal_group *, u32); extern int iscsit_ta_demo_mode_discovery(struct iscsi_portal_group *, u32); extern int iscsit_ta_default_erl(struct iscsi_portal_group *, u32); extern int iscsit_ta_t10_pi(struct iscsi_portal_group *, u32); +extern int iscsit_ta_login_keys_workaround(struct iscsi_portal_group *, u32); #endif /* ISCSI_TARGET_TPG_H */ -- cgit v1.2.3