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-rw-r--r--net/netlabel/netlabel_kapi.c102
1 files changed, 54 insertions, 48 deletions
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index d9e10466b928..bc3883814890 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -407,6 +407,7 @@ out_entry:
#define _CM_F_NONE 0x00000000
#define _CM_F_ALLOC 0x00000001
+#define _CM_F_WALK 0x00000002
/**
* _netlbl_secattr_catmap_getnode - Get a individual node from a catmap
@@ -416,10 +417,11 @@ out_entry:
* @gfp_flags: memory allocation flags
*
* Description:
- * Iterate through the catmap looking for the node associated with @offset; if
- * the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
- * one will be created and inserted into the catmap. Returns a pointer to the
- * node on success, NULL on failure.
+ * Iterate through the catmap looking for the node associated with @offset.
+ * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
+ * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
+ * set in @cm_flags and there is no associated node, the next highest node will
+ * be returned. Returns a pointer to the node on success, NULL on failure.
*
*/
static struct netlbl_lsm_secattr_catmap *_netlbl_secattr_catmap_getnode(
@@ -431,17 +433,22 @@ static struct netlbl_lsm_secattr_catmap *_netlbl_secattr_catmap_getnode(
struct netlbl_lsm_secattr_catmap *iter = *catmap;
struct netlbl_lsm_secattr_catmap *prev = NULL;
- if (iter == NULL || offset < iter->startbit)
+ if (iter == NULL)
goto secattr_catmap_getnode_alloc;
+ if (offset < iter->startbit)
+ goto secattr_catmap_getnode_walk;
while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
prev = iter;
iter = iter->next;
}
if (iter == NULL || offset < iter->startbit)
- goto secattr_catmap_getnode_alloc;
+ goto secattr_catmap_getnode_walk;
return iter;
+secattr_catmap_getnode_walk:
+ if (cm_flags & _CM_F_WALK)
+ return iter;
secattr_catmap_getnode_alloc:
if (!(cm_flags & _CM_F_ALLOC))
return NULL;
@@ -476,43 +483,41 @@ 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;
+ u32 idx;
+ u32 bit;
NETLBL_CATMAP_MAPTYPE bitmap;
+ iter = _netlbl_secattr_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
+ if (iter == NULL)
+ return -ENOENT;
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);
+ offset -= iter->startbit;
+ idx = offset / NETLBL_CATMAP_MAPSIZE;
+ bit = offset % NETLBL_CATMAP_MAPSIZE;
} else {
- node_idx = 0;
- node_bit = 0;
+ idx = 0;
+ bit = 0;
}
- bitmap = iter->bitmap[node_idx] >> node_bit;
+ bitmap = iter->bitmap[idx] >> bit;
for (;;) {
if (bitmap != 0) {
while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
bitmap >>= 1;
- node_bit++;
+ bit++;
}
return iter->startbit +
- (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
+ (NETLBL_CATMAP_MAPSIZE * idx) + bit;
}
- if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
+ if (++idx >= NETLBL_CATMAP_MAPCNT) {
if (iter->next != NULL) {
iter = iter->next;
- node_idx = 0;
+ idx = 0;
} else
return -ENOENT;
}
- bitmap = iter->bitmap[node_idx];
- node_bit = 0;
+ bitmap = iter->bitmap[idx];
+ bit = 0;
}
return -ENOENT;
@@ -532,46 +537,47 @@ int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
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;
+ struct netlbl_lsm_secattr_catmap *iter;
+ struct netlbl_lsm_secattr_catmap *prev = NULL;
+ u32 idx;
+ u32 bit;
NETLBL_CATMAP_MAPTYPE bitmask;
NETLBL_CATMAP_MAPTYPE bitmap;
+ iter = _netlbl_secattr_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
+ if (iter == NULL)
+ return -ENOENT;
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);
+ offset -= iter->startbit;
+ idx = offset / NETLBL_CATMAP_MAPSIZE;
+ bit = offset % NETLBL_CATMAP_MAPSIZE;
} else {
- node_idx = 0;
- node_bit = 0;
+ idx = 0;
+ bit = 0;
}
- bitmask = NETLBL_CATMAP_BIT << node_bit;
+ bitmask = NETLBL_CATMAP_BIT << bit;
for (;;) {
- bitmap = iter->bitmap[node_idx];
+ bitmap = iter->bitmap[idx];
while (bitmask != 0 && (bitmap & bitmask) != 0) {
bitmask <<= 1;
- node_bit++;
+ bit++;
}
- if (bitmask != 0)
+ if (prev && idx == 0 && bit == 0)
+ return prev->startbit + NETLBL_CATMAP_SIZE - 1;
+ else if (bitmask != 0)
return iter->startbit +
- (NETLBL_CATMAP_MAPSIZE * node_idx) +
- node_bit - 1;
- else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
+ (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
+ else if (++idx >= NETLBL_CATMAP_MAPCNT) {
if (iter->next == NULL)
- return iter->startbit + NETLBL_CATMAP_SIZE - 1;
+ return iter->startbit + NETLBL_CATMAP_SIZE - 1;
+ prev = iter;
iter = iter->next;
- node_idx = 0;
+ idx = 0;
}
bitmask = NETLBL_CATMAP_BIT;
- node_bit = 0;
+ bit = 0;
}
return -ENOENT;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-28 13:26:21 +0000