IB/ipoib: Remove ACL sysfs debug files

Currently, there are device attributes like add_acl which are writable and
can be used to add ACL in addition to using ioctl. The kernel needs to
parse a string from user space. While parsing IPv4 address is simple,
parsing IPv6 address is not. And it is error prone and can be a security
issue if not done right. Since those attributes are only used in a debug
kernel, it is advisable to remove those attributes instead of adding IPv6
support to them. The following attributes, add_acl, delete_acl, acl,
acl_instance, add_acl_instance and delete_acl_instance are removed. The
last four do not handle IP address. But to be consistent, they are also
removed.

Orabug: 25410192

Signed-off-by: Ka-Cheong Poon <[email protected]>
Reviewed-by: Yuval Shaia <[email protected]>
Reviewed-by: Håkon Bugge <[email protected]>

Orabug: 27487514

(cherry picked from commit a37d690)
cherry-pick-repo=linux-uek.git

Signed-off-by: Gerd Rausch <[email protected]>
Reviewed-by: Sudhakar Didnukurti <[email protected]>
Signed-off-by: Aron Silverton <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Author: kcp-git

drivers/infiniband/ulp/ipoib/ipoib_acl.c

@@ -34,74 +34,6 @@
 #include <linux/jhash.h>
 #include "ipoib.h"
 
-int extract_guid_and_subnet(const char *buf, char *name, u64 *subnet_prefix,
-			    u64 *guid)
-{
-	u64 gid[8];
-	int i, shift;
-
-	memset(&gid, 0, sizeof(gid));
-
-	if (name) {
-		if (sscanf(buf,
-			   "%s %4llx:%4llx:%4llx:%4llx:%4llx:%4llx:%4llx:%4llx",
-			   name, &gid[0], &gid[1], &gid[2], &gid[3], &gid[4],
-			   &gid[5], &gid[6], &gid[7]) != 9)
-			return -EINVAL;
-	} else {
-		if (sscanf(buf,
-			   "%4llx:%4llx:%4llx:%4llx:%4llx:%4llx:%4llx:%4llx",
-			   &gid[0], &gid[1], &gid[2], &gid[3], &gid[4], &gid[5],
-			   &gid[6], &gid[7]) != 8)
-			return -EINVAL;
-	}
-
-	*guid = 0;
-	*subnet_prefix = 0;
-	for (i = 0; i < 4; i++) {
-		shift = ((3 - i) * 16);
-		*subnet_prefix |= gid[i] << shift;
-		*guid |= gid[i + 4] << shift;
-	}
-
-	return 0;
-}
-
-int extract_guid_subnet_and_ip(const char *buf, char *name, u64 *subnet_prefix,
-			       u64 *guid, u32 *src_ip, char *uuid)
-{
-	u64 gid[8];
-	u32 ip[4];
-	int rc, i, shift;
-
-	memset(&gid, 0, sizeof(gid));
-	memset(&ip, 0, sizeof(ip));
-	memset(uuid, 0, UUID_SZ);
-
-	rc = sscanf(buf,
-		"%s %4llx:%4llx:%4llx:%4llx:%4llx:%4llx:%4llx:%4llx %s %d.%d.%d.%d",
-		name, &gid[0], &gid[1], &gid[2], &gid[3], &gid[4], &gid[5],
-		&gid[6], &gid[7], uuid, &ip[0], &ip[1],  &ip[2],  &ip[3]);
-	if (rc != 14)
-		return -EINVAL;
-
-	*guid = 0;
-	*subnet_prefix = 0;
-	for (i = 0; i < 4; i++) {
-		shift = ((3 - i) * 16);
-		*subnet_prefix |= gid[i] << shift;
-		*guid |= gid[i + 4] << shift;
-	}
-
-	*src_ip = 0;
-	for (i = 0; i < 4; i++) {
-		shift = ((3 - i) * 8);
-		*src_ip |= ip[i] << shift;
-	}
-
-	return 0;
-}
-
 static ssize_t show_acl_enabled(struct device *d,
 				struct device_attribute *attr, char *buf)
 {
@@ -122,131 +54,6 @@ static ssize_t set_acl_enabled(struct device *d, struct device_attribute *attr,
 static DEVICE_ATTR(acl_enabled, S_IWUSR | S_IRUGO, show_acl_enabled,
 		   set_acl_enabled);
 
-static ssize_t add_acl(struct device *d, struct device_attribute *attr,
-		       const char *buf, size_t count)
-{
-	struct ipoib_dev_priv *priv = ipoib_priv(to_net_dev(d));
-	int rc;
-	u64 guid, subnet_prefix;
-	u32 ip;
-	char uuid[UUID_SZ];
-	struct ib_cm_acl *instance_acl;
-	char name[INSTANCE_ACL_ID_SZ];
-
-	rc = extract_guid_subnet_and_ip(buf, name, &subnet_prefix, &guid, &ip,
-					uuid);
-	if (rc)
-		return rc;
-
-	instance_acl = ipoib_get_instance_acl(name, to_net_dev(d));
-	if (!instance_acl)
-		return -EINVAL;
-
-	rc = ib_cm_acl_insert(instance_acl, subnet_prefix, guid, ip, uuid);
-	if (rc)
-		return rc;
-
-	rc = ib_cm_acl_insert(&priv->acl, subnet_prefix, guid, ip, uuid);
-	if (rc)
-		return rc;
-
-	return count;
-}
-
-static DEVICE_ATTR(add_acl, S_IWUSR, NULL, add_acl);
-
-static ssize_t delete_acl(struct device *d, struct device_attribute *attr,
-			  const char *buf, size_t count)
-{
-	struct ipoib_dev_priv *priv = ipoib_priv(to_net_dev(d));
-	u64 guid, subnet_prefix;
-	int rc;
-	struct ib_cm_acl *instance_acl;
-	char name[INSTANCE_ACL_ID_SZ];
-
-	rc = extract_guid_and_subnet(buf, name, &subnet_prefix, &guid);
-	if (rc)
-		return rc;
-
-	instance_acl = ipoib_get_instance_acl(name, to_net_dev(d));
-	if (!instance_acl)
-		return -EINVAL;
-
-	ib_cm_acl_delete(instance_acl, subnet_prefix, guid);
-	ib_cm_acl_delete(&priv->acl, subnet_prefix, guid);
-
-	return count;
-}
-
-static DEVICE_ATTR(delete_acl, S_IWUSR, NULL, delete_acl);
-
-static void print_acl_to_buf(char *buf, size_t buf_size, const char *name,
-			     size_t name_size, struct ib_cm_acl *acl)
-{
-	struct ib_cm_acl_elem *list;
-	ssize_t list_count, i;
-	u8 *subnet_prefix, *guid;
-	u8 *ip;
-	size_t curr_buf_size = 0;
-	const size_t line_size = name_size + 100; /* Rough estimation */
-
-	ib_cm_acl_scan(acl, &list, &list_count);
-	for (i = 0; i < list_count; i++) {
-		/* Do we have enough place for more lines */
-		if (curr_buf_size >= buf_size + line_size) {
-			strcat(buf, "\nNo more space in buffer \n");
-			goto out;
-		}
-
-		subnet_prefix = (u8 *)&(list[i].subnet_prefix);
-		guid = (u8 *)&(list[i].guid);
-		ip = (u8 *)&(list[i].ip);
-		curr_buf_size += sprintf(buf,
-			"%s%s\t%d\t%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\t%s\t%d.%d.%d.%d\n",
-			buf, name, list[i].ref_count, subnet_prefix[7],
-			subnet_prefix[6], subnet_prefix[5], subnet_prefix[4],
-			subnet_prefix[3], subnet_prefix[2], subnet_prefix[1],
-			subnet_prefix[0], guid[7], guid[6], guid[5], guid[4],
-			guid[3], guid[2], guid[1], guid[0], list[i].uuid,
-			ip[3], ip[2], ip[1], ip[0]);
-	}
-
-out:
-	kfree(list);
-}
-
-static ssize_t show_acl(struct device *d,
-			struct device_attribute *attr, char *buf)
-{
-	struct ipoib_dev_priv *priv = ipoib_priv(to_net_dev(d));
-	struct ipoib_instance_acl *results[ACL_BATCH_SZ];
-	unsigned int count, i;
-	unsigned long idx = 0;
-
-	strcpy(buf, "");
-
-	/* Per Documentation/filesystems/sysfs.txt buf size is PAGE_SIZE */
-	print_acl_to_buf(buf, PAGE_SIZE, DRIVER_ACL_NAME, INSTANCE_ACL_ID_SZ,
-			 &priv->acl);
-
-	count = 0;
-	do {
-		count = radix_tree_gang_lookup(&priv->instances_acls.instances,
-					      (void **)results, idx,
-					      ACL_BATCH_SZ);
-		for (i = 0; i < count; i++)
-			print_acl_to_buf(buf, PAGE_SIZE, results[i]->name,
-					 INSTANCE_ACL_ID_SZ, &results[i]->acl);
-		if (count)
-			idx = jhash(results[i - 1]->name,
-				    strlen(results[i - 1]->name), 0) + 1;
-	} while (count);
-
-	return strlen(buf);
-}
-
-static DEVICE_ATTR(acl, S_IRUGO, show_acl, NULL);
-
 void print_acl_instances_to_buf(char *buf, size_t sz,
 				struct ipoib_dev_priv *priv)
 {
@@ -278,94 +85,12 @@ void print_acl_instances_to_buf(char *buf, size_t sz,
 	} while (count);
 }
 
-static ssize_t show_acl_instances(struct device *d,
-				  struct device_attribute *attr, char *buf)
-{
-	struct ipoib_dev_priv *priv = ipoib_priv(to_net_dev(d));
-
-	/* Per Documentation/filesystems/sysfs.txt buf size is PAGE_SIZE */
-	if (priv->instances_acls.list_count * (INSTANCE_ACL_ID_SZ + 1) + 1 <
-	    PAGE_SIZE)
-		print_acl_instances_to_buf(buf, priv->instances_acls.list_count
-					   * (INSTANCE_ACL_ID_SZ + 1)  + 1,
-					   priv);
-
-	return strlen(buf);
-}
-
-static DEVICE_ATTR(acl_instances, S_IRUGO, show_acl_instances, NULL);
-
-static ssize_t add_acl_instance(struct device *d, struct device_attribute *attr,
-				const char *buf, size_t count)
-{
-	char name[INSTANCE_ACL_ID_SZ];
-	char *crlf_pos = strchr(buf, '\n');
-
-	strncpy(name, buf, INSTANCE_ACL_ID_SZ - 1);
-	if (crlf_pos && (crlf_pos - buf) < INSTANCE_ACL_ID_SZ - 1)
-		name[crlf_pos - buf] = 0;
-	else
-		name[INSTANCE_ACL_ID_SZ - 1] = 0;
-	ipoib_create_instance_acl(name, to_net_dev(d));
-
-	return count;
-}
-
-static DEVICE_ATTR(add_acl_instance, S_IWUSR, NULL, add_acl_instance);
-
-static ssize_t delete_acl_instance(struct device *d,
-				   struct device_attribute *attr,
-				   const char *buf, size_t count)
-{
-	char name[INSTANCE_ACL_ID_SZ];
-	char *crlf_pos = strchr(buf, '\n');
-
-	strncpy(name, buf, INSTANCE_ACL_ID_SZ - 1);
-	if (crlf_pos && (crlf_pos - buf) < INSTANCE_ACL_ID_SZ - 1)
-		name[crlf_pos - buf] = 0;
-	else
-		name[INSTANCE_ACL_ID_SZ - 1] = 0;
-	ipoib_delete_instance_acl(name, to_net_dev(d));
-
-	return count;
-}
-
-static DEVICE_ATTR(delete_acl_instance, S_IWUSR, NULL, delete_acl_instance);
-
 int ipoib_create_acl_sysfs(struct net_device *dev)
 {
-	int rc;
-
 	if (!ipoib_debug_level)
 		dev_attr_acl_enabled.attr.mode = 0444;
 
-	rc = device_create_file(&dev->dev, &dev_attr_acl_enabled);
-	if (rc)
-		return rc;
-
-	if (!ipoib_debug_level)
-		return 0;
-
-	rc = device_create_file(&dev->dev, &dev_attr_add_acl);
-	if (rc)
-		return rc;
-	rc = device_create_file(&dev->dev, &dev_attr_delete_acl);
-	if (rc)
-		return rc;
-	rc = device_create_file(&dev->dev, &dev_attr_acl);
-	if (rc)
-		return rc;
-	rc = device_create_file(&dev->dev, &dev_attr_add_acl_instance);
-	if (rc)
-		return rc;
-	rc = device_create_file(&dev->dev, &dev_attr_delete_acl_instance);
-	if (rc)
-		return rc;
-	rc = device_create_file(&dev->dev, &dev_attr_acl_instances);
-	if (rc)
-		return rc;
-
-	return 0;
+	return device_create_file(&dev->dev, &dev_attr_acl_enabled);
 }
 
 void delete_instance_acls(struct net_device *dev)