packets: Do not assume that IPv4, TCP, or ARP headers are 32-bit aligned.

[cascardo/ovs.git] / lib / unaligned.h

diff --git a/lib/unaligned.h b/lib/unaligned.h
index 2654a27..154eb13 100644 (file)
--- a/lib/unaligned.h
+++ b/lib/unaligned.h
@@ -174,6 +174,21 @@ put_unaligned_u64(uint64_t *p, uint64_t x)
     put_unaligned_u64__(p, x);
 }
 \f
+/* Returns the value in 'x'. */
+static inline uint32_t
+get_16aligned_u32(const ovs_16aligned_u32 *x)
+{
+    return ((uint32_t) x->hi << 16) | x->lo;
+}
+
+/* Stores 'value' in 'x'. */
+static inline void
+put_16aligned_u32(ovs_16aligned_u32 *x, uint32_t value)
+{
+    x->hi = value >> 16;
+    x->lo = value;
+}
+
 /* Returns the value in 'x'. */
 static inline uint64_t
 get_32aligned_u64(const ovs_32aligned_u64 *x)
@@ -190,6 +205,30 @@ put_32aligned_u64(ovs_32aligned_u64 *x, uint64_t value)
 }
 
 #ifndef __CHECKER__
+/* Returns the value of 'x'. */
+static inline ovs_be32
+get_16aligned_be32(const ovs_16aligned_be32 *x)
+{
+#ifdef WORDS_BIGENDIAN
+    return ((ovs_be32) x->hi << 16) | x->lo;
+#else
+    return ((ovs_be32) x->lo << 16) | x->hi;
+#endif
+}
+
+/* Stores network byte order 'value' into 'x'. */
+static inline void
+put_16aligned_be32(ovs_16aligned_be32 *x, ovs_be32 value)
+{
+#if WORDS_BIGENDIAN
+    x->hi = value >> 16;
+    x->lo = value;
+#else
+    x->hi = value;
+    x->lo = value >> 16;
+#endif
+}
+
 /* Returns the value of 'x'. */
 static inline ovs_be64
 get_32aligned_be64(const ovs_32aligned_be64 *x)
@@ -216,6 +255,8 @@ put_32aligned_be64(ovs_32aligned_be64 *x, ovs_be64 value)
 #else  /* __CHECKER__ */
 /* Making sparse happy with these functions also makes them unreadable, so
  * don't bother to show it their implementations. */
+ovs_be32 get_16aligned_be32(const ovs_16aligned_be32 *);
+void put_16aligned_be32(ovs_16aligned_be32 *, ovs_be32);
 ovs_be64 get_32aligned_be64(const ovs_32aligned_be64 *);
 void put_32aligned_be64(ovs_32aligned_be64 *, ovs_be64);
 #endif