1 files changed, 101 insertions, 0 deletions

diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c
new file mode 100644
index 000000000000..90a587cacaa4
--- /dev/null
+++ b/net/ipv4/protocol.c
@@ -0,0 +1,101 @@
+/*
+ * INET         An implementation of the TCP/IP protocol suite for the LINUX
+ *              operating system.  INET is implemented using the  BSD Socket
+ *              interface as the means of communication with the user level.
+ *
+ *              INET protocol dispatch tables.
+ *
+ * Version:     $Id: protocol.c,v 1.14 2001/05/18 02:25:49 davem Exp $
+ *
+ * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
+ *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ * Fixes:
+ *              Alan Cox        : Ahah! udp icmp errors don't work because
+ *                                udp_err is never called!
+ *              Alan Cox        : Added new fields for init and ready for
+ *                                proper fragmentation (_NO_ 4K limits!)
+ *              Richard Colella : Hang on hash collision
+ *              Vince Laviano   : Modified inet_del_protocol() to correctly
+ *                                maintain copy bit.
+ *
+ *              This program is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/config.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/timer.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/tcp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/ipip.h>
+#include <linux/igmp.h>
+
+struct net_protocol *inet_protos[MAX_INET_PROTOS];
+static DEFINE_SPINLOCK(inet_proto_lock);
+
+/*
+ *      Add a protocol handler to the hash tables
+ */
+
+int inet_add_protocol(struct net_protocol *prot, unsigned char protocol)
+{
+        int hash, ret;
+
+        hash = protocol & (MAX_INET_PROTOS - 1);
+
+        spin_lock_bh(&inet_proto_lock);
+        if (inet_protos[hash]) {
+                ret = -1;
+        } else {
+                inet_protos[hash] = prot;
+                ret = 0;
+        }
+        spin_unlock_bh(&inet_proto_lock);
+
+        return ret;
+}
+
+/*
+ *      Remove a protocol from the hash tables.
+ */
+ 
+int inet_del_protocol(struct net_protocol *prot, unsigned char protocol)
+{
+        int hash, ret;
+
+        hash = protocol & (MAX_INET_PROTOS - 1);
+
+        spin_lock_bh(&inet_proto_lock);
+        if (inet_protos[hash] == prot) {
+                inet_protos[hash] = NULL;
+                ret = 0;
+        } else {
+                ret = -1;
+        }
+        spin_unlock_bh(&inet_proto_lock);
+
+        synchronize_net();
+
+        return ret;
+}
+
+EXPORT_SYMBOL(inet_add_protocol);
+EXPORT_SYMBOL(inet_del_protocol);