Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / llc / llc_core.c

diff --git a/kernel/net/llc/llc_core.c b/kernel/net/llc/llc_core.c
new file mode 100644 (file)
index 0000000..842851c
--- /dev/null
+++ b/kernel/net/llc/llc_core.c
@@ -0,0 +1,168 @@
+/*
+ * 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);
+               atomic_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 - searchs a SAP in station
+ *     @sap_value: sap to be found
+ *
+ *     Searchs 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(sap);
+       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);
+
+       synchronize_rcu();
+
+       kfree(sap);
+}
+
+static struct packet_type llc_packet_type __read_mostly = {
+       .type = cpu_to_be16(ETH_P_802_2),
+       .func = llc_rcv,
+};
+
+static struct packet_type llc_tr_packet_type __read_mostly = {
+       .type = cpu_to_be16(ETH_P_TR_802_2),
+       .func = llc_rcv,
+};
+
+static int __init llc_init(void)
+{
+       dev_add_pack(&llc_packet_type);
+       dev_add_pack(&llc_tr_packet_type);
+       return 0;
+}
+
+static void __exit llc_exit(void)
+{
+       dev_remove_pack(&llc_packet_type);
+       dev_remove_pack(&llc_tr_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");