aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv4/protocol.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/protocol.c')
-rw-r--r--net/ipv4/protocol.c101
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);