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-rw-r--r--net/ipv4/cipso_ipv4.c113
1 files changed, 53 insertions, 60 deletions
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 23a968f..a056278 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -958,35 +958,28 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
* Protocol Handling Functions
*/
+#define CIPSO_V4_OPT_LEN_MAX 40
#define CIPSO_V4_HDR_LEN 6
/**
* cipso_v4_gentag_hdr - Generate a CIPSO option header
* @doi_def: the DOI definition
- * @len: the total tag length in bytes
+ * @len: the total tag length in bytes, not including this header
* @buf: the CIPSO option buffer
*
* Description:
- * Write a CIPSO header into the beginning of @buffer. Return zero on success,
- * negative values on failure.
+ * Write a CIPSO header into the beginning of @buffer.
*
*/
-static int cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def,
- u32 len,
- unsigned char *buf)
+static void cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def,
+ unsigned char *buf,
+ u32 len)
{
- if (CIPSO_V4_HDR_LEN + len > 40)
- return -ENOSPC;
-
buf[0] = IPOPT_CIPSO;
buf[1] = CIPSO_V4_HDR_LEN + len;
*(__be32 *)&buf[2] = htonl(doi_def->doi);
-
- return 0;
}
-#define CIPSO_V4_TAG1_CAT_LEN 30
-
/**
* cipso_v4_gentag_rbm - Generate a CIPSO restricted bitmap tag (type #1)
* @doi_def: the DOI definition
@@ -997,71 +990,50 @@ static int cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def,
* Description:
* Generate a CIPSO option using the restricted bitmap tag, tag type #1. The
* actual buffer length may be larger than the indicated size due to
- * translation between host and network category bitmaps. Returns zero on
- * success, negative values on failure.
+ * translation between host and network category bitmaps. Returns the size of
+ * the tag on success, negative values on failure.
*
*/
static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr,
- unsigned char **buffer,
- u32 *buffer_len)
+ unsigned char *buffer,
+ u32 buffer_len)
{
int ret_val;
- unsigned char *buf = NULL;
- u32 buf_len;
+ u32 tag_len;
u32 level;
if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0)
return -EPERM;
- if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
- buf = kzalloc(CIPSO_V4_HDR_LEN + 4 + CIPSO_V4_TAG1_CAT_LEN,
- GFP_ATOMIC);
- if (buf == NULL)
- return -ENOMEM;
+ ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level);
+ if (ret_val != 0)
+ return ret_val;
+ if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
ret_val = cipso_v4_map_cat_rbm_hton(doi_def,
secattr->mls_cat,
secattr->mls_cat_len,
- &buf[CIPSO_V4_HDR_LEN + 4],
- CIPSO_V4_TAG1_CAT_LEN);
+ &buffer[4],
+ buffer_len - 4);
if (ret_val < 0)
- goto gentag_failure;
+ return ret_val;
/* This will send packets using the "optimized" format when
* possibile as specified in section 3.4.2.6 of the
* CIPSO draft. */
if (cipso_v4_rbm_optfmt && ret_val > 0 && ret_val <= 10)
- buf_len = 14;
+ tag_len = 14;
else
- buf_len = 4 + ret_val;
- } else {
- buf = kzalloc(CIPSO_V4_HDR_LEN + 4, GFP_ATOMIC);
- if (buf == NULL)
- return -ENOMEM;
- buf_len = 4;
- }
-
- ret_val = cipso_v4_map_lvl_hton(doi_def, secattr->mls_lvl, &level);
- if (ret_val != 0)
- goto gentag_failure;
-
- ret_val = cipso_v4_gentag_hdr(doi_def, buf_len, buf);
- if (ret_val != 0)
- goto gentag_failure;
-
- buf[CIPSO_V4_HDR_LEN] = 0x01;
- buf[CIPSO_V4_HDR_LEN + 1] = buf_len;
- buf[CIPSO_V4_HDR_LEN + 3] = level;
+ tag_len = 4 + ret_val;
+ } else
+ tag_len = 4;
- *buffer = buf;
- *buffer_len = CIPSO_V4_HDR_LEN + buf_len;
+ buffer[0] = 0x01;
+ buffer[1] = tag_len;
+ buffer[3] = level;
- return 0;
-
-gentag_failure:
- kfree(buf);
- return ret_val;
+ return tag_len;
}
/**
@@ -1284,7 +1256,7 @@ int cipso_v4_socket_setattr(const struct socket *sock,
{
int ret_val = -EPERM;
u32 iter;
- unsigned char *buf = NULL;
+ unsigned char *buf;
u32 buf_len = 0;
u32 opt_len;
struct ip_options *opt = NULL;
@@ -1300,17 +1272,28 @@ int cipso_v4_socket_setattr(const struct socket *sock,
if (sk == NULL)
return 0;
+ /* We allocate the maximum CIPSO option size here so we are probably
+ * being a little wasteful, but it makes our life _much_ easier later
+ * on and after all we are only talking about 40 bytes. */
+ buf_len = CIPSO_V4_OPT_LEN_MAX;
+ buf = kmalloc(buf_len, GFP_ATOMIC);
+ if (buf == NULL) {
+ ret_val = -ENOMEM;
+ goto socket_setattr_failure;
+ }
+
/* XXX - This code assumes only one tag per CIPSO option which isn't
* really a good assumption to make but since we only support the MAC
* tags right now it is a safe assumption. */
iter = 0;
do {
+ memset(buf, 0, buf_len);
switch (doi_def->tags[iter]) {
case CIPSO_V4_TAG_RBITMAP:
ret_val = cipso_v4_gentag_rbm(doi_def,
- secattr,
- &buf,
- &buf_len);
+ secattr,
+ &buf[CIPSO_V4_HDR_LEN],
+ buf_len - CIPSO_V4_HDR_LEN);
break;
default:
ret_val = -EPERM;
@@ -1318,11 +1301,13 @@ int cipso_v4_socket_setattr(const struct socket *sock,
}
iter++;
- } while (ret_val != 0 &&
+ } while (ret_val < 0 &&
iter < CIPSO_V4_TAG_MAXCNT &&
doi_def->tags[iter] != CIPSO_V4_TAG_INVALID);
- if (ret_val != 0)
+ if (ret_val < 0)
goto socket_setattr_failure;
+ cipso_v4_gentag_hdr(doi_def, buf, ret_val);
+ buf_len = CIPSO_V4_HDR_LEN + ret_val;
/* We can't use ip_options_get() directly because it makes a call to
* ip_options_get_alloc() which allocates memory with GFP_KERNEL and
@@ -1396,6 +1381,10 @@ int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
rcu_read_unlock();
return -ENOMSG;
}
+
+ /* XXX - This code assumes only one tag per CIPSO option which isn't
+ * really a good assumption to make but since we only support the MAC
+ * tags right now it is a safe assumption. */
switch (cipso_ptr[6]) {
case CIPSO_V4_TAG_RBITMAP:
ret_val = cipso_v4_parsetag_rbm(doi_def,
@@ -1458,6 +1447,10 @@ int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
doi_def = cipso_v4_doi_getdef(doi);
if (doi_def == NULL)
goto skbuff_getattr_return;
+
+ /* XXX - This code assumes only one tag per CIPSO option which isn't
+ * really a good assumption to make but since we only support the MAC
+ * tags right now it is a safe assumption. */
switch (cipso_ptr[6]) {
case CIPSO_V4_TAG_RBITMAP:
ret_val = cipso_v4_parsetag_rbm(doi_def,
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