qeth: Exploit Connection Isolation

[pandora-kernel.git] / drivers / s390 / net / qeth_core_sys.c

diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c
index 33505c2..f2358a7 100644 (file)
--- 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,
 };