1 files changed, 222 insertions, 0 deletions

diff --git a/include/net/l3mdev.h b/include/net/l3mdev.h
new file mode 100644
index 000000000000..774d85b2d5d9
--- /dev/null
+++ b/include/net/l3mdev.h
@@ -0,0 +1,222 @@
+/*
+ * include/net/l3mdev.h - L3 master device API
+ * Copyright (c) 2015 Cumulus Networks
+ * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
+ *
+ * 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.
+ */
+#ifndef _NET_L3MDEV_H_
+#define _NET_L3MDEV_H_
+
+/**
+ * struct l3mdev_ops - l3mdev operations
+ *
+ * @l3mdev_fib_table: Get FIB table id to use for lookups
+ *
+ * @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
+ *
+ * @l3mdev_get_saddr: Get source address for a flow
+ *
+ * @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device
+ */
+
+struct l3mdev_ops {
+        u32             (*l3mdev_fib_table)(const struct net_device *dev);
+
+        /* IPv4 ops */
+        struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
+                                             const struct flowi4 *fl4);
+        void            (*l3mdev_get_saddr)(struct net_device *dev,
+                                            struct flowi4 *fl4);
+
+        /* IPv6 ops */
+        struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev,
+                                                 const struct flowi6 *fl6);
+};
+
+#ifdef CONFIG_NET_L3_MASTER_DEV
+
+int l3mdev_master_ifindex_rcu(struct net_device *dev);
+static inline int l3mdev_master_ifindex(struct net_device *dev)
+{
+        int ifindex;
+
+        rcu_read_lock();
+        ifindex = l3mdev_master_ifindex_rcu(dev);
+        rcu_read_unlock();
+
+        return ifindex;
+}
+
+/* get index of an interface to use for FIB lookups. For devices
+ * enslaved to an L3 master device FIB lookups are based on the
+ * master index
+ */
+static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
+{
+        return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
+}
+
+static inline int l3mdev_fib_oif(struct net_device *dev)
+{
+        int oif;
+
+        rcu_read_lock();
+        oif = l3mdev_fib_oif_rcu(dev);
+        rcu_read_unlock();
+
+        return oif;
+}
+
+u32 l3mdev_fib_table_rcu(const struct net_device *dev);
+u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
+static inline u32 l3mdev_fib_table(const struct net_device *dev)
+{
+        u32 tb_id;
+
+        rcu_read_lock();
+        tb_id = l3mdev_fib_table_rcu(dev);
+        rcu_read_unlock();
+
+        return tb_id;
+}
+
+static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
+                                               const struct flowi4 *fl4)
+{
+        if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
+                return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
+
+        return NULL;
+}
+
+static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
+{
+        struct net_device *dev;
+        bool rc = false;
+
+        if (ifindex == 0)
+                return false;
+
+        rcu_read_lock();
+
+        dev = dev_get_by_index_rcu(net, ifindex);
+        if (dev)
+                rc = netif_is_l3_master(dev);
+
+        rcu_read_unlock();
+
+        return rc;
+}
+
+static inline void l3mdev_get_saddr(struct net *net, int ifindex,
+                                    struct flowi4 *fl4)
+{
+        struct net_device *dev;
+
+        if (ifindex) {
+
+                rcu_read_lock();
+
+                dev = dev_get_by_index_rcu(net, ifindex);
+                if (dev && netif_is_l3_master(dev) &&
+                    dev->l3mdev_ops->l3mdev_get_saddr) {
+                        dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
+                }
+
+                rcu_read_unlock();
+        }
+}
+
+static inline struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
+                                                   const struct flowi6 *fl6)
+{
+        if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rt6_dst)
+                return dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
+
+        return NULL;
+}
+
+static inline
+struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,
+                                        const struct flowi6 *fl6)
+{
+        struct dst_entry *dst = NULL;
+        struct net_device *dev;
+
+        dev = dev_get_by_index(net, fl6->flowi6_oif);
+        if (dev) {
+                dst = l3mdev_get_rt6_dst(dev, fl6);
+                dev_put(dev);
+        }
+
+        return dst;
+}
+
+#else
+
+static inline int l3mdev_master_ifindex_rcu(struct net_device *dev)
+{
+        return 0;
+}
+static inline int l3mdev_master_ifindex(struct net_device *dev)
+{
+        return 0;
+}
+
+static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
+{
+        return dev ? dev->ifindex : 0;
+}
+static inline int l3mdev_fib_oif(struct net_device *dev)
+{
+        return dev ? dev->ifindex : 0;
+}
+
+static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
+{
+        return 0;
+}
+static inline u32 l3mdev_fib_table(const struct net_device *dev)
+{
+        return 0;
+}
+static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
+{
+        return 0;
+}
+
+static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
+                                               const struct flowi4 *fl4)
+{
+        return NULL;
+}
+
+static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
+{
+        return false;
+}
+
+static inline void l3mdev_get_saddr(struct net *net, int ifindex,
+                                    struct flowi4 *fl4)
+{
+}
+
+static inline
+struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
+                                     const struct flowi6 *fl6)
+{
+        return NULL;
+}
+static inline
+struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,
+                                        const struct flowi6 *fl6)
+{
+        return NULL;
+}
+#endif
+
+#endif /* _NET_L3MDEV_H_ */