[SCTP]: Fix the bind_addr info during migration.

During accept/migrate the code attempts to copy the addresses from
the parent endpoint to the new endpoint.   However, if the parent
was bound to a wildcard address, then we end up pointlessly copying
all of the current addresses on the system.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 0 deletions

diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
index cae95af9a8cc..6a7d01091f0c 100644
--- a/net/sctp/bind_addr.c
+++ b/net/sctp/bind_addr.c
@@ -105,6 +105,32 @@ out:
         return error;
 }
 
+/* Exactly duplicate the address lists.  This is necessary when doing
+ * peer-offs and accepts.  We don't want to put all the current system
+ * addresses into the endpoint.  That's useless.  But we do want duplicat
+ * the list of bound addresses that the older endpoint used.
+ */
+int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
+                        const struct sctp_bind_addr *src,
+                        gfp_t gfp)
+{
+        struct sctp_sockaddr_entry *addr;
+        struct list_head *pos;
+        int error = 0;
+
+        /* All addresses share the same port.  */
+        dest->port = src->port;
+
+        list_for_each(pos, &src->address_list) {
+                addr = list_entry(pos, struct sctp_sockaddr_entry, list);
+                error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
+                if (error < 0)
+                        break;
+        }
+
+        return error;
+}
+
 /* Initialize the SCTP_bind_addr structure for either an endpoint or
  * an association.
  */