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authorPaul Moore <pmoore@redhat.com>2015-02-11 22:46:37 +0300
committerPaul Moore <pmoore@redhat.com>2015-02-11 22:46:37 +0300
commit04f81f0154e4bf002be6f4d85668ce1257efa4d9 (patch)
tree6572c58a65fe65aa738419e43e45e59c32538357 /include/net
parent6eb4e2b41b264f57ee02d16ee61683952945484d (diff)
downloadlinux-04f81f0154e4bf002be6f4d85668ce1257efa4d9.tar.xz
cipso: don't use IPCB() to locate the CIPSO IP option
Using the IPCB() macro to get the IPv4 options is convenient, but unfortunately NetLabel often needs to examine the CIPSO option outside of the scope of the IP layer in the stack. While historically IPCB() worked above the IP layer, due to the inclusion of the inet_skb_param struct at the head of the {tcp,udp}_skb_cb structs, recent commit 971f10ec ("tcp: better TCP_SKB_CB layout to reduce cache line misses") reordered the tcp_skb_cb struct and invalidated this IPCB() trick. This patch fixes the problem by creating a new function, cipso_v4_optptr(), which locates the CIPSO option inside the IP header without calling IPCB(). Unfortunately, this isn't as fast as a simple lookup so some additional tweaks were made to limit the use of this new function. Cc: <stable@vger.kernel.org> # 3.18 Reported-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Paul Moore <pmoore@redhat.com> Tested-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/cipso_ipv4.h25
1 files changed, 16 insertions, 9 deletions
diff --git a/include/net/cipso_ipv4.h b/include/net/cipso_ipv4.h
index a6fd939f202d..3ebb168b9afc 100644
--- a/include/net/cipso_ipv4.h
+++ b/include/net/cipso_ipv4.h
@@ -121,13 +121,6 @@ extern int cipso_v4_rbm_strictvalid;
#endif
/*
- * Helper Functions
- */
-
-#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
-#define CIPSO_V4_OPTPTR(x) (skb_network_header(x) + IPCB(x)->opt.cipso)
-
-/*
* DOI List Functions
*/
@@ -190,7 +183,7 @@ static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
#ifdef CONFIG_NETLABEL
void cipso_v4_cache_invalidate(void);
-int cipso_v4_cache_add(const struct sk_buff *skb,
+int cipso_v4_cache_add(const unsigned char *cipso_ptr,
const struct netlbl_lsm_secattr *secattr);
#else
static inline void cipso_v4_cache_invalidate(void)
@@ -198,7 +191,7 @@ static inline void cipso_v4_cache_invalidate(void)
return;
}
-static inline int cipso_v4_cache_add(const struct sk_buff *skb,
+static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
const struct netlbl_lsm_secattr *secattr)
{
return 0;
@@ -211,6 +204,8 @@ static inline int cipso_v4_cache_add(const struct sk_buff *skb,
#ifdef CONFIG_NETLABEL
void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
+int cipso_v4_getattr(const unsigned char *cipso,
+ struct netlbl_lsm_secattr *secattr);
int cipso_v4_sock_setattr(struct sock *sk,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr);
@@ -226,6 +221,7 @@ int cipso_v4_skbuff_setattr(struct sk_buff *skb,
int cipso_v4_skbuff_delattr(struct sk_buff *skb);
int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
struct netlbl_lsm_secattr *secattr);
+unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
#else
static inline void cipso_v4_error(struct sk_buff *skb,
@@ -235,6 +231,12 @@ static inline void cipso_v4_error(struct sk_buff *skb,
return;
}
+static inline int cipso_v4_getattr(const unsigned char *cipso,
+ struct netlbl_lsm_secattr *secattr)
+{
+ return -ENOSYS;
+}
+
static inline int cipso_v4_sock_setattr(struct sock *sk,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
@@ -282,6 +284,11 @@ static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
return -ENOSYS;
}
+static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
+{
+ return NULL;
+}
+
static inline int cipso_v4_validate(const struct sk_buff *skb,
unsigned char **option)
{