Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 159 insertions, 0 deletions

diff --git a/net/llc/llc_core.c b/net/llc/llc_core.c
new file mode 100644
index 000000000..4f16d9c88
--- /dev/null
+++ b/net/llc/llc_core.c
@@ -0,0 +1,159 @@
+/*
+ * llc_core.c - Minimum needed routines for sap handling and module init/exit
+ *
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ * 		 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * This program can be redistributed or modified under the terms of the
+ * GNU General Public License as published by the Free Software Foundation.
+ * This program is distributed without any warranty or implied warranty
+ * of merchantability or fitness for a particular purpose.
+ *
+ * See the GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <net/net_namespace.h>
+#include <net/llc.h>
+
+LIST_HEAD(llc_sap_list);
+static DEFINE_SPINLOCK(llc_sap_list_lock);
+
+/**
+ *	llc_sap_alloc - allocates and initializes sap.
+ *
+ *	Allocates and initializes sap.
+ */
+static struct llc_sap *llc_sap_alloc(void)
+{
+	struct llc_sap *sap = kzalloc(sizeof(*sap), GFP_ATOMIC);
+	int i;
+
+	if (sap) {
+		/* sap->laddr.mac - leave as a null, it's filled by bind */
+		sap->state = LLC_SAP_STATE_ACTIVE;
+		spin_lock_init(&sap->sk_lock);
+		for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++)
+			INIT_HLIST_NULLS_HEAD(&sap->sk_laddr_hash[i], i);
+		refcount_set(&sap->refcnt, 1);
+	}
+	return sap;
+}
+
+static struct llc_sap *__llc_sap_find(unsigned char sap_value)
+{
+	struct llc_sap *sap;
+
+	list_for_each_entry(sap, &llc_sap_list, node)
+		if (sap->laddr.lsap == sap_value)
+			goto out;
+	sap = NULL;
+out:
+	return sap;
+}
+
+/**
+ *	llc_sap_find - searches a SAP in station
+ *	@sap_value: sap to be found
+ *
+ *	Searches for a sap in the sap list of the LLC's station upon the sap ID.
+ *	If the sap is found it will be refcounted and the user will have to do
+ *	a llc_sap_put after use.
+ *	Returns the sap or %NULL if not found.
+ */
+struct llc_sap *llc_sap_find(unsigned char sap_value)
+{
+	struct llc_sap *sap;
+
+	rcu_read_lock_bh();
+	sap = __llc_sap_find(sap_value);
+	if (!sap || !llc_sap_hold_safe(sap))
+		sap = NULL;
+	rcu_read_unlock_bh();
+	return sap;
+}
+
+/**
+ *	llc_sap_open - open interface to the upper layers.
+ *	@lsap: SAP number.
+ *	@func: rcv func for datalink protos
+ *
+ *	Interface function to upper layer. Each one who wants to get a SAP
+ *	(for example NetBEUI) should call this function. Returns the opened
+ *	SAP for success, NULL for failure.
+ */
+struct llc_sap *llc_sap_open(unsigned char lsap,
+			     int (*func)(struct sk_buff *skb,
+					 struct net_device *dev,
+					 struct packet_type *pt,
+					 struct net_device *orig_dev))
+{
+	struct llc_sap *sap = NULL;
+
+	spin_lock_bh(&llc_sap_list_lock);
+	if (__llc_sap_find(lsap)) /* SAP already exists */
+		goto out;
+	sap = llc_sap_alloc();
+	if (!sap)
+		goto out;
+	sap->laddr.lsap = lsap;
+	sap->rcv_func	= func;
+	list_add_tail_rcu(&sap->node, &llc_sap_list);
+out:
+	spin_unlock_bh(&llc_sap_list_lock);
+	return sap;
+}
+
+/**
+ *	llc_sap_close - close interface for upper layers.
+ *	@sap: SAP to be closed.
+ *
+ *	Close interface function to upper layer. Each one who wants to
+ *	close an open SAP (for example NetBEUI) should call this function.
+ * 	Removes this sap from the list of saps in the station and then
+ * 	frees the memory for this sap.
+ */
+void llc_sap_close(struct llc_sap *sap)
+{
+	WARN_ON(sap->sk_count);
+
+	spin_lock_bh(&llc_sap_list_lock);
+	list_del_rcu(&sap->node);
+	spin_unlock_bh(&llc_sap_list_lock);
+
+	kfree_rcu(sap, rcu);
+}
+
+static struct packet_type llc_packet_type __read_mostly = {
+	.type = cpu_to_be16(ETH_P_802_2),
+	.func = llc_rcv,
+};
+
+static int __init llc_init(void)
+{
+	dev_add_pack(&llc_packet_type);
+	return 0;
+}
+
+static void __exit llc_exit(void)
+{
+	dev_remove_pack(&llc_packet_type);
+}
+
+module_init(llc_init);
+module_exit(llc_exit);
+
+EXPORT_SYMBOL(llc_sap_list);
+EXPORT_SYMBOL(llc_sap_find);
+EXPORT_SYMBOL(llc_sap_open);
+EXPORT_SYMBOL(llc_sap_close);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
+MODULE_DESCRIPTION("LLC IEEE 802.2 core support");