X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=net%2Fnetlabel%2Fnetlabel_kapi.c;h=4f50949722a95a6e082404601b98c98f39190821;hb=c21723edd5f6c288ab613ed658b7140e07fc7209;hp=b35ebf94918ce3a0bb7002c11cd66480b25e9382;hpb=05e00cbf5036929355020dab4837b637203a0742;p=powerpc.git

diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index b35ebf9491..4f50949722 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -38,42 +38,260 @@
 #include "netlabel_domainhash.h"
 #include "netlabel_unlabeled.h"
 #include "netlabel_user.h"
+#include "netlabel_mgmt.h"
+
+/*
+ * Security Attribute Functions
+ */
+
+/**
+ * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
+ * @catmap: the category bitmap
+ * @offset: the offset to start searching at, in bits
+ *
+ * Description:
+ * This function walks a LSM secattr category bitmap starting at @offset and
+ * returns the spot of the first set bit or -ENOENT if no bits are set.
+ *
+ */
+int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
+			       u32 offset)
+{
+	struct netlbl_lsm_secattr_catmap *iter = catmap;
+	u32 node_idx;
+	u32 node_bit;
+	NETLBL_CATMAP_MAPTYPE bitmap;
+
+	if (offset > iter->startbit) {
+		while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
+			iter = iter->next;
+			if (iter == NULL)
+				return -ENOENT;
+		}
+		node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
+		node_bit = offset - iter->startbit -
+			   (NETLBL_CATMAP_MAPSIZE * node_idx);
+	} else {
+		node_idx = 0;
+		node_bit = 0;
+	}
+	bitmap = iter->bitmap[node_idx] >> node_bit;
+
+	for (;;) {
+		if (bitmap != 0) {
+			while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
+				bitmap >>= 1;
+				node_bit++;
+			}
+			return iter->startbit +
+				(NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
+		}
+		if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
+			if (iter->next != NULL) {
+				iter = iter->next;
+				node_idx = 0;
+			} else
+				return -ENOENT;
+		}
+		bitmap = iter->bitmap[node_idx];
+		node_bit = 0;
+	}
+
+	return -ENOENT;
+}
+
+/**
+ * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
+ * @catmap: the category bitmap
+ * @offset: the offset to start searching at, in bits
+ *
+ * Description:
+ * This function walks a LSM secattr category bitmap starting at @offset and
+ * returns the spot of the first cleared bit or -ENOENT if the offset is past
+ * the end of the bitmap.
+ *
+ */
+int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
+				   u32 offset)
+{
+	struct netlbl_lsm_secattr_catmap *iter = catmap;
+	u32 node_idx;
+	u32 node_bit;
+	NETLBL_CATMAP_MAPTYPE bitmask;
+	NETLBL_CATMAP_MAPTYPE bitmap;
+
+	if (offset > iter->startbit) {
+		while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
+			iter = iter->next;
+			if (iter == NULL)
+				return -ENOENT;
+		}
+		node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
+		node_bit = offset - iter->startbit -
+			   (NETLBL_CATMAP_MAPSIZE * node_idx);
+	} else {
+		node_idx = 0;
+		node_bit = 0;
+	}
+	bitmask = NETLBL_CATMAP_BIT << node_bit;
+
+	for (;;) {
+		bitmap = iter->bitmap[node_idx];
+		while (bitmask != 0 && (bitmap & bitmask) != 0) {
+			bitmask <<= 1;
+			node_bit++;
+		}
+
+		if (bitmask != 0)
+			return iter->startbit +
+				(NETLBL_CATMAP_MAPSIZE * node_idx) +
+				node_bit - 1;
+		else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
+			if (iter->next == NULL)
+				return iter->startbit +	NETLBL_CATMAP_SIZE - 1;
+			iter = iter->next;
+			node_idx = 0;
+		}
+		bitmask = NETLBL_CATMAP_BIT;
+		node_bit = 0;
+	}
+
+	return -ENOENT;
+}
+
+/**
+ * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
+ * @catmap: the category bitmap
+ * @bit: the bit to set
+ * @flags: memory allocation flags
+ *
+ * Description:
+ * Set the bit specified by @bit in @catmap.  Returns zero on success,
+ * negative values on failure.
+ *
+ */
+int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
+				 u32 bit,
+				 gfp_t flags)
+{
+	struct netlbl_lsm_secattr_catmap *iter = catmap;
+	u32 node_bit;
+	u32 node_idx;
+
+	while (iter->next != NULL &&
+	       bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
+		iter = iter->next;
+	if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
+		iter->next = netlbl_secattr_catmap_alloc(flags);
+		if (iter->next == NULL)
+			return -ENOMEM;
+		iter = iter->next;
+		iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
+	}
+
+	/* gcc always rounds to zero when doing integer division */
+	node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
+	node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
+	iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
+
+	return 0;
+}
+
+/**
+ * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
+ * @catmap: the category bitmap
+ * @start: the starting bit
+ * @end: the last bit in the string
+ * @flags: memory allocation flags
+ *
+ * Description:
+ * Set a range of bits, starting at @start and ending with @end.  Returns zero
+ * on success, negative values on failure.
+ *
+ */
+int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
+				 u32 start,
+				 u32 end,
+				 gfp_t flags)
+{
+	int ret_val = 0;
+	struct netlbl_lsm_secattr_catmap *iter = catmap;
+	u32 iter_max_spot;
+	u32 spot;
+
+	/* XXX - This could probably be made a bit faster by combining writes
+	 * to the catmap instead of setting a single bit each time, but for
+	 * right now skipping to the start of the range in the catmap should
+	 * be a nice improvement over calling the individual setbit function
+	 * repeatedly from a loop. */
+
+	while (iter->next != NULL &&
+	       start >= (iter->startbit + NETLBL_CATMAP_SIZE))
+		iter = iter->next;
+	iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
+
+	for (spot = start; spot <= end && ret_val == 0; spot++) {
+		if (spot >= iter_max_spot && iter->next != NULL) {
+			iter = iter->next;
+			iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
+		}
+		ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
+	}
+
+	return ret_val;
+}
 
 /*
  * LSM Functions
  */
 
+/**
+ * netlbl_enabled - Determine if the NetLabel subsystem is enabled
+ *
+ * Description:
+ * The LSM can use this function to determine if it should use NetLabel
+ * security attributes in it's enforcement mechanism.  Currently, NetLabel is
+ * considered to be enabled when it's configuration contains a valid setup for
+ * at least one labeled protocol (i.e. NetLabel can understand incoming
+ * labeled packets of at least one type); otherwise NetLabel is considered to
+ * be disabled.
+ *
+ */
+int netlbl_enabled(void)
+{
+	/* At some point we probably want to expose this mechanism to the user
+	 * as well so that admins can toggle NetLabel regardless of the
+	 * configuration */
+	return (netlbl_mgmt_protocount_value() > 0 ? 1 : 0);
+}
+
 /**
  * netlbl_socket_setattr - Label a socket using the correct protocol
- * @sock: the socket to label
+ * @sk: the socket to label
  * @secattr: the security attributes
  *
  * Description:
  * Attach the correct label to the given socket using the security attributes
- * specified in @secattr.  This function requires exclusive access to
- * @sock->sk, which means it either needs to be in the process of being
- * created or locked via lock_sock(sock->sk).  Returns zero on success,
- * negative values on failure.
+ * specified in @secattr.  This function requires exclusive access to @sk,
+ * which means it either needs to be in the process of being created or locked.
+ * Returns zero on success, negative values on failure.
  *
  */
-int netlbl_socket_setattr(const struct socket *sock,
-			  const struct netlbl_lsm_secattr *secattr)
+int netlbl_sock_setattr(struct sock *sk,
+			const struct netlbl_lsm_secattr *secattr)
 {
 	int ret_val = -ENOENT;
 	struct netlbl_dom_map *dom_entry;
 
-	if ((secattr->flags & NETLBL_SECATTR_DOMAIN) == 0)
-		return -ENOENT;
-
 	rcu_read_lock();
 	dom_entry = netlbl_domhsh_getentry(secattr->domain);
 	if (dom_entry == NULL)
 		goto socket_setattr_return;
 	switch (dom_entry->type) {
 	case NETLBL_NLTYPE_CIPSOV4:
-		ret_val = cipso_v4_socket_setattr(sock,
-						  dom_entry->type_def.cipsov4,
-						  secattr);
+		ret_val = cipso_v4_sock_setattr(sk,
+						dom_entry->type_def.cipsov4,
+						secattr);
 		break;
 	case NETLBL_NLTYPE_UNLABELED:
 		ret_val = 0;
@@ -110,30 +328,6 @@ int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
 	return netlbl_unlabel_getattr(secattr);
 }
 
-/**
- * netlbl_socket_getattr - Determine the security attributes of a socket
- * @sock: the socket
- * @secattr: the security attributes
- *
- * Description:
- * Examines the given socket to see any NetLabel style labeling has been
- * applied to the socket, if so it parses the socket label and returns the
- * security attributes in @secattr.  Returns zero on success, negative values
- * on failure.
- *
- */
-int netlbl_socket_getattr(const struct socket *sock,
-			  struct netlbl_lsm_secattr *secattr)
-{
-	int ret_val;
-
-	ret_val = cipso_v4_socket_getattr(sock, secattr);
-	if (ret_val == 0)
-		return 0;
-
-	return netlbl_unlabel_getattr(secattr);
-}
-
 /**
  * netlbl_skbuff_getattr - Determine the security attributes of a packet
  * @skb: the packet