[SCTP]: Beginning of sin_port fixes.

That's going to be a long series.  Introduced temporary helpers
doing copy-and-convert for sctp_addr; they are used to kill
flip-in-place in global data structures and will be used
to gradually push host-endian uses of sctp_addr out of existence.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index ca77bc5b7ff5..2aa61ac9a9f3 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -74,6 +74,28 @@ union sctp_addr {
         struct sockaddr sa;
 };
 
+static inline void flip_to_n(union sctp_addr *to, const union sctp_addr *from)
+{
+        size_t len;
+        if (from->sa.sa_family == AF_INET6)
+                len = sizeof(struct sockaddr_in6);
+        else
+                len = sizeof(struct sockaddr);
+        memcpy(to, from, len);
+        to->v4.sin_port = htons(from->v4.sin_port);
+}
+
+static inline void flip_to_h(union sctp_addr *to, const union sctp_addr *from)
+{
+        size_t len;
+        if (from->sa.sa_family == AF_INET6)
+                len = sizeof(struct sockaddr_in6);
+        else
+                len = sizeof(struct sockaddr);
+        memcpy(to, from, len);
+        to->v4.sin_port = ntohs(from->v4.sin_port);
+}
+
 /* Forward declarations for data structures. */
 struct sctp_globals;
 struct sctp_endpoint;