Phonet: PF_PHONET protocol family support

This is the basis for the Phonet protocol families, and introduces
the ETH_P_PHONET packet type and the PF_PHONET socket family.

Signed-off-by: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 74 insertions, 0 deletions

diff --git a/include/net/phonet/phonet.h b/include/net/phonet/phonet.h
new file mode 100644
index 000000000000..c53f2abc0595
--- /dev/null
+++ b/include/net/phonet/phonet.h
@@ -0,0 +1,74 @@
+/*
+ * File: af_phonet.h
+ *
+ * Phonet sockets kernel definitions
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef AF_PHONET_H
+#define AF_PHONET_H
+
+/*
+ * The lower layers may not require more space, ever. Make sure it's
+ * enough.
+ */
+#define MAX_PHONET_HEADER       8
+
+static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
+{
+        return (struct phonethdr *)skb_network_header(skb);
+}
+
+/*
+ * Get the other party's sockaddr from received skb. The skb begins
+ * with a Phonet header.
+ */
+static inline
+void pn_skb_get_src_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
+{
+        struct phonethdr *ph = pn_hdr(skb);
+        u16 obj = pn_object(ph->pn_sdev, ph->pn_sobj);
+
+        sa->spn_family = AF_PHONET;
+        pn_sockaddr_set_object(sa, obj);
+        pn_sockaddr_set_resource(sa, ph->pn_res);
+        memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
+}
+
+static inline
+void pn_skb_get_dst_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
+{
+        struct phonethdr *ph = pn_hdr(skb);
+        u16 obj = pn_object(ph->pn_rdev, ph->pn_robj);
+
+        sa->spn_family = AF_PHONET;
+        pn_sockaddr_set_object(sa, obj);
+        pn_sockaddr_set_resource(sa, ph->pn_res);
+        memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
+}
+
+/* Protocols in Phonet protocol family. */
+struct phonet_protocol {
+        struct proto            *prot;
+        int                     sock_type;
+};
+
+int phonet_proto_register(int protocol, struct phonet_protocol *pp);
+void phonet_proto_unregister(int protocol, struct phonet_protocol *pp);
+
+#endif