qeth: Exploit Connection Isolation

Isolate data connection to a shared OSA card against other data
connections to the same OSA card. Connectivity between isolated
data connections sharing the same OSA card is therefore possible only
through external network gear (e.g. a router).

Signed-off-by: Einar Lueck <elelueck@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 267 insertions, 12 deletions

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index e8f72d715eb..4df5eaad6f9 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -648,6 +648,7 @@ struct qeth_card_options {
 	enum qeth_large_send_types large_send;
 	int performance_stats;
 	int rx_sg_cb;
+	enum qeth_ipa_isolation_modes isolation;
 };
 
 /*
@@ -856,6 +857,7 @@ void qeth_core_get_strings(struct net_device *, u32, u8 *);
 void qeth_core_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
 void qeth_dbf_longtext(enum qeth_dbf_names dbf_nix, int level, char *text, ...);
 int qeth_core_ethtool_get_settings(struct net_device *, struct ethtool_cmd *);
+int qeth_set_access_ctrl_online(struct qeth_card *card);
 
 /* exports for OSN */
 int qeth_osn_assist(struct net_device *, void *, int);
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index edee4dc6430..2c71948c71a 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1079,6 +1079,7 @@ static void qeth_set_intial_options(struct qeth_card *card)
 	card->options.add_hhlen = DEFAULT_ADD_HHLEN;
 	card->options.performance_stats = 0;
 	card->options.rx_sg_cb = QETH_RX_SG_CB;
+	card->options.isolation = ISOLATION_MODE_NONE;
 }
 
 static int qeth_do_start_thread(struct qeth_card *card, unsigned long thread)
@@ -3389,6 +3390,156 @@ int qeth_setadpparms_change_macaddr(struct qeth_card *card)
 }
 EXPORT_SYMBOL_GPL(qeth_setadpparms_change_macaddr);
 
+static int qeth_setadpparms_set_access_ctrl_cb(struct qeth_card *card,
+		struct qeth_reply *reply, unsigned long data)
+{
+	struct qeth_ipa_cmd *cmd;
+	struct qeth_set_access_ctrl *access_ctrl_req;
+	int rc;
+
+	QETH_DBF_TEXT(TRACE, 4, "setaccb");
+
+	cmd = (struct qeth_ipa_cmd *) data;
+	access_ctrl_req = &cmd->data.setadapterparms.data.set_access_ctrl;
+	QETH_DBF_TEXT_(SETUP, 2, "setaccb");
+	QETH_DBF_TEXT_(SETUP, 2, "%s", card->gdev->dev.kobj.name);
+	QETH_DBF_TEXT_(SETUP, 2, "rc=%d",
+		cmd->data.setadapterparms.hdr.return_code);
+	switch (cmd->data.setadapterparms.hdr.return_code) {
+	case SET_ACCESS_CTRL_RC_SUCCESS:
+	case SET_ACCESS_CTRL_RC_ALREADY_NOT_ISOLATED:
+	case SET_ACCESS_CTRL_RC_ALREADY_ISOLATED:
+	{
+		card->options.isolation = access_ctrl_req->subcmd_code;
+		if (card->options.isolation == ISOLATION_MODE_NONE) {
+			dev_info(&card->gdev->dev,
+			    "QDIO data connection isolation is deactivated\n");
+		} else {
+			dev_info(&card->gdev->dev,
+			    "QDIO data connection isolation is activated\n");
+		}
+		QETH_DBF_MESSAGE(3, "OK:SET_ACCESS_CTRL(%s, %d)==%d\n",
+			card->gdev->dev.kobj.name,
+			access_ctrl_req->subcmd_code,
+			cmd->data.setadapterparms.hdr.return_code);
+		rc = 0;
+		break;
+	}
+	case SET_ACCESS_CTRL_RC_NOT_SUPPORTED:
+	{
+		QETH_DBF_MESSAGE(3, "ERR:SET_ACCESS_CTRL(%s,%d)==%d\n",
+			card->gdev->dev.kobj.name,
+			access_ctrl_req->subcmd_code,
+			cmd->data.setadapterparms.hdr.return_code);
+		dev_err(&card->gdev->dev, "Adapter does not "
+			"support QDIO data connection isolation\n");
+
+		/* ensure isolation mode is "none" */
+		card->options.isolation = ISOLATION_MODE_NONE;
+		rc = -EOPNOTSUPP;
+		break;
+	}
+	case SET_ACCESS_CTRL_RC_NONE_SHARED_ADAPTER:
+	{
+		QETH_DBF_MESSAGE(3, "ERR:SET_ACCESS_MODE(%s,%d)==%d\n",
+			card->gdev->dev.kobj.name,
+			access_ctrl_req->subcmd_code,
+			cmd->data.setadapterparms.hdr.return_code);
+		dev_err(&card->gdev->dev,
+			"Adapter is dedicated. "
+			"QDIO data connection isolation not supported\n");
+
+		/* ensure isolation mode is "none" */
+		card->options.isolation = ISOLATION_MODE_NONE;
+		rc = -EOPNOTSUPP;
+		break;
+	}
+	case SET_ACCESS_CTRL_RC_ACTIVE_CHECKSUM_OFF:
+	{
+		QETH_DBF_MESSAGE(3, "ERR:SET_ACCESS_MODE(%s,%d)==%d\n",
+			card->gdev->dev.kobj.name,
+			access_ctrl_req->subcmd_code,
+			cmd->data.setadapterparms.hdr.return_code);
+		dev_err(&card->gdev->dev,
+			"TSO does not permit QDIO data connection isolation\n");
+
+		/* ensure isolation mode is "none" */
+		card->options.isolation = ISOLATION_MODE_NONE;
+		rc = -EPERM;
+		break;
+	}
+	default:
+	{
+		/* this should never happen */
+		QETH_DBF_MESSAGE(3, "ERR:SET_ACCESS_MODE(%s,%d)==%d"
+			"==UNKNOWN\n",
+			card->gdev->dev.kobj.name,
+			access_ctrl_req->subcmd_code,
+			cmd->data.setadapterparms.hdr.return_code);
+
+		/* ensure isolation mode is "none" */
+		card->options.isolation = ISOLATION_MODE_NONE;
+		rc = 0;
+		break;
+	}
+	}
+	qeth_default_setadapterparms_cb(card, reply, (unsigned long) cmd);
+	return rc;
+}
+
+static int qeth_setadpparms_set_access_ctrl(struct qeth_card *card,
+		enum qeth_ipa_isolation_modes isolation)
+{
+	int rc;
+	struct qeth_cmd_buffer *iob;
+	struct qeth_ipa_cmd *cmd;
+	struct qeth_set_access_ctrl *access_ctrl_req;
+
+	QETH_DBF_TEXT(TRACE, 4, "setacctl");
+
+	QETH_DBF_TEXT_(SETUP, 2, "setacctl");
+	QETH_DBF_TEXT_(SETUP, 2, "%s", card->gdev->dev.kobj.name);
+
+	iob = qeth_get_adapter_cmd(card, IPA_SETADP_SET_ACCESS_CONTROL,
+				   sizeof(struct qeth_ipacmd_setadpparms_hdr) +
+				   sizeof(struct qeth_set_access_ctrl));
+	cmd = (struct qeth_ipa_cmd *)(iob->data+IPA_PDU_HEADER_SIZE);
+	access_ctrl_req = &cmd->data.setadapterparms.data.set_access_ctrl;
+	access_ctrl_req->subcmd_code = isolation;
+
+	rc = qeth_send_ipa_cmd(card, iob, qeth_setadpparms_set_access_ctrl_cb,
+			       NULL);
+	QETH_DBF_TEXT_(SETUP, 2, "rc=%d", rc);
+	return rc;
+}
+
+int qeth_set_access_ctrl_online(struct qeth_card *card)
+{
+	int rc = 0;
+
+	QETH_DBF_TEXT(TRACE, 4, "setactlo");
+
+	if (card->info.type == QETH_CARD_TYPE_OSAE &&
+	    qeth_adp_supported(card, IPA_SETADP_SET_ACCESS_CONTROL)) {
+		rc = qeth_setadpparms_set_access_ctrl(card,
+			card->options.isolation);
+		if (rc) {
+			QETH_DBF_MESSAGE(3,
+				"IPA(SET_ACCESS_CTRL,%s,%d) sent failed",
+				card->gdev->dev.kobj.name,
+				rc);
+		}
+	} else if (card->options.isolation != ISOLATION_MODE_NONE) {
+		card->options.isolation = ISOLATION_MODE_NONE;
+
+		dev_err(&card->gdev->dev, "Adapter does not "
+			"support QDIO data connection isolation\n");
+		rc = -EOPNOTSUPP;
+	}
+	return rc;
+}
+EXPORT_SYMBOL_GPL(qeth_set_access_ctrl_online);
+
 void qeth_tx_timeout(struct net_device *dev)
 {
 	struct qeth_card *card;
diff --git a/drivers/s390/net/qeth_core_mpc.h b/drivers/s390/net/qeth_core_mpc.h
index eecb2ee62e8..52c03438dbe 100644
--- a/drivers/s390/net/qeth_core_mpc.h
+++ b/drivers/s390/net/qeth_core_mpc.h
@@ -234,18 +234,19 @@ enum qeth_ipa_setdelip_flags {
 
 /* SETADAPTER IPA Command: ****************************************************/
 enum qeth_ipa_setadp_cmd {
-	IPA_SETADP_QUERY_COMMANDS_SUPPORTED	= 0x0001,
-	IPA_SETADP_ALTER_MAC_ADDRESS		= 0x0002,
-	IPA_SETADP_ADD_DELETE_GROUP_ADDRESS	= 0x0004,
-	IPA_SETADP_ADD_DELETE_FUNCTIONAL_ADDR	= 0x0008,
-	IPA_SETADP_SET_ADDRESSING_MODE		= 0x0010,
-	IPA_SETADP_SET_CONFIG_PARMS		= 0x0020,
-	IPA_SETADP_SET_CONFIG_PARMS_EXTENDED	= 0x0040,
-	IPA_SETADP_SET_BROADCAST_MODE		= 0x0080,
-	IPA_SETADP_SEND_OSA_MESSAGE		= 0x0100,
-	IPA_SETADP_SET_SNMP_CONTROL		= 0x0200,
-	IPA_SETADP_QUERY_CARD_INFO		= 0x0400,
-	IPA_SETADP_SET_PROMISC_MODE		= 0x0800,
+	IPA_SETADP_QUERY_COMMANDS_SUPPORTED	= 0x00000001L,
+	IPA_SETADP_ALTER_MAC_ADDRESS		= 0x00000002L,
+	IPA_SETADP_ADD_DELETE_GROUP_ADDRESS	= 0x00000004L,
+	IPA_SETADP_ADD_DELETE_FUNCTIONAL_ADDR	= 0x00000008L,
+	IPA_SETADP_SET_ADDRESSING_MODE		= 0x00000010L,
+	IPA_SETADP_SET_CONFIG_PARMS		= 0x00000020L,
+	IPA_SETADP_SET_CONFIG_PARMS_EXTENDED	= 0x00000040L,
+	IPA_SETADP_SET_BROADCAST_MODE		= 0x00000080L,
+	IPA_SETADP_SEND_OSA_MESSAGE		= 0x00000100L,
+	IPA_SETADP_SET_SNMP_CONTROL		= 0x00000200L,
+	IPA_SETADP_QUERY_CARD_INFO		= 0x00000400L,
+	IPA_SETADP_SET_PROMISC_MODE		= 0x00000800L,
+	IPA_SETADP_SET_ACCESS_CONTROL		= 0x00010000L,
 };
 enum qeth_ipa_mac_ops {
 	CHANGE_ADDR_READ_MAC		= 0,
@@ -264,6 +265,20 @@ enum qeth_ipa_promisc_modes {
 	SET_PROMISC_MODE_OFF		= 0,
 	SET_PROMISC_MODE_ON		= 1,
 };
+enum qeth_ipa_isolation_modes {
+	ISOLATION_MODE_NONE		= 0x00000000L,
+	ISOLATION_MODE_FWD		= 0x00000001L,
+	ISOLATION_MODE_DROP		= 0x00000002L,
+};
+enum qeth_ipa_set_access_mode_rc {
+	SET_ACCESS_CTRL_RC_SUCCESS		= 0x0000,
+	SET_ACCESS_CTRL_RC_NOT_SUPPORTED	= 0x0004,
+	SET_ACCESS_CTRL_RC_ALREADY_NOT_ISOLATED	= 0x0008,
+	SET_ACCESS_CTRL_RC_ALREADY_ISOLATED	= 0x0010,
+	SET_ACCESS_CTRL_RC_NONE_SHARED_ADAPTER	= 0x0014,
+	SET_ACCESS_CTRL_RC_ACTIVE_CHECKSUM_OFF	= 0x0018,
+};
+
 
 /* (SET)DELIP(M) IPA stuff ***************************************************/
 struct qeth_ipacmd_setdelip4 {
@@ -376,6 +391,11 @@ struct qeth_snmp_ureq {
 	struct qeth_snmp_cmd cmd;
 } __attribute__((packed));
 
+/* SET_ACCESS_CONTROL: same format for request and reply */
+struct qeth_set_access_ctrl {
+	__u32 subcmd_code;
+} __attribute__((packed));
+
 struct qeth_ipacmd_setadpparms_hdr {
 	__u32 supp_hw_cmds;
 	__u32 reserved1;
@@ -394,6 +414,7 @@ struct qeth_ipacmd_setadpparms {
 		struct qeth_query_cmds_supp query_cmds_supp;
 		struct qeth_change_addr change_addr;
 		struct qeth_snmp_cmd snmp;
+		struct qeth_set_access_ctrl set_access_ctrl;
 		__u32 mode;
 	} data;
 } __attribute__ ((packed));
diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c
index 33505c2a0e3..f2358a75ed0 100644
--- a/drivers/s390/net/qeth_core_sys.c
+++ b/drivers/s390/net/qeth_core_sys.c
@@ -463,6 +463,82 @@ static ssize_t qeth_dev_large_send_store(struct device *dev,
 static DEVICE_ATTR(large_send, 0644, qeth_dev_large_send_show,
 		   qeth_dev_large_send_store);
 
+#define ATTR_QETH_ISOLATION_NONE	("none")
+#define ATTR_QETH_ISOLATION_FWD		("forward")
+#define ATTR_QETH_ISOLATION_DROP	("drop")
+
+static ssize_t qeth_dev_isolation_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct qeth_card *card = dev_get_drvdata(dev);
+
+	if (!card)
+		return -EINVAL;
+
+	switch (card->options.isolation) {
+	case ISOLATION_MODE_NONE:
+		return snprintf(buf, 6, "%s\n", ATTR_QETH_ISOLATION_NONE);
+	case ISOLATION_MODE_FWD:
+		return snprintf(buf, 9, "%s\n", ATTR_QETH_ISOLATION_FWD);
+	case ISOLATION_MODE_DROP:
+		return snprintf(buf, 6, "%s\n", ATTR_QETH_ISOLATION_DROP);
+	default:
+		return snprintf(buf, 5, "%s\n", "N/A");
+	}
+}
+
+static ssize_t qeth_dev_isolation_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct qeth_card *card = dev_get_drvdata(dev);
+	enum qeth_ipa_isolation_modes isolation;
+	int rc = 0;
+	char *tmp, *curtoken;
+	curtoken = (char *) buf;
+
+	if (!card) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* check for unknown, too, in case we do not yet know who we are */
+	if (card->info.type != QETH_CARD_TYPE_OSAE &&
+	    card->info.type != QETH_CARD_TYPE_UNKNOWN) {
+		rc = -EOPNOTSUPP;
+		dev_err(&card->gdev->dev, "Adapter does not "
+			"support QDIO data connection isolation\n");
+		goto out;
+	}
+
+	/* parse input into isolation mode */
+	tmp = strsep(&curtoken, "\n");
+	if (!strcmp(tmp, ATTR_QETH_ISOLATION_NONE)) {
+		isolation = ISOLATION_MODE_NONE;
+	} else if (!strcmp(tmp, ATTR_QETH_ISOLATION_FWD)) {
+		isolation = ISOLATION_MODE_FWD;
+	} else if (!strcmp(tmp, ATTR_QETH_ISOLATION_DROP)) {
+		isolation = ISOLATION_MODE_DROP;
+	} else {
+		rc = -EINVAL;
+		goto out;
+	}
+	rc = count;
+
+	/* defer IP assist if device is offline (until discipline->set_online)*/
+	card->options.isolation = isolation;
+	if (card->state == CARD_STATE_SOFTSETUP ||
+	    card->state == CARD_STATE_UP) {
+		int ipa_rc = qeth_set_access_ctrl_online(card);
+		if (ipa_rc != 0)
+			rc = ipa_rc;
+	}
+out:
+	return rc;
+}
+
+static DEVICE_ATTR(isolation, 0644, qeth_dev_isolation_show,
+		   qeth_dev_isolation_store);
+
 static ssize_t qeth_dev_blkt_show(char *buf, struct qeth_card *card, int value)
 {
 
@@ -583,6 +659,7 @@ static struct attribute *qeth_device_attrs[] = {
 	&dev_attr_performance_stats.attr,
 	&dev_attr_layer2.attr,
 	&dev_attr_large_send.attr,
+	&dev_attr_isolation.attr,
 	NULL,
 };
 
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index b61d5c723c5..a63a3dfcdf6 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -988,6 +988,8 @@ static int __qeth_l2_set_online(struct ccwgroup_device *gdev, int recovery_mode)
 		card->lan_online = 1;
 
 	if (card->info.type != QETH_CARD_TYPE_OSN) {
+		/* configure isolation level */
+		qeth_set_access_ctrl_online(card);
 		qeth_set_large_send(card, card->options.large_send);
 		qeth_l2_process_vlans(card, 0);
 	}
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 4ca28c16ca8..dd6766672a0 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1506,6 +1506,8 @@ static int qeth_l3_start_ipa_tso(struct qeth_card *card)
 static int qeth_l3_start_ipassists(struct qeth_card *card)
 {
 	QETH_DBF_TEXT(TRACE, 3, "strtipas");
+
+	qeth_set_access_ctrl_online(card);	/* go on*/
 	qeth_l3_start_ipa_arp_processing(card);	/* go on*/
 	qeth_l3_start_ipa_ip_fragmentation(card);	/* go on*/
 	qeth_l3_start_ipa_source_mac(card);	/* go on*/