v4.19.13 snapshot.
diff --git a/net/l3mdev/l3mdev.c b/net/l3mdev/l3mdev.c
new file mode 100644
index 0000000..8da86ce
--- /dev/null
+++ b/net/l3mdev/l3mdev.c
@@ -0,0 +1,203 @@
+/*
+ * net/l3mdev/l3mdev.c - L3 master device implementation
+ * 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.
+ */
+
+#include <linux/netdevice.h>
+#include <net/fib_rules.h>
+#include <net/l3mdev.h>
+
+/**
+ * l3mdev_master_ifindex - get index of L3 master device
+ * @dev: targeted interface
+ */
+
+int l3mdev_master_ifindex_rcu(const struct net_device *dev)
+{
+ int ifindex = 0;
+
+ if (!dev)
+ return 0;
+
+ if (netif_is_l3_master(dev)) {
+ ifindex = dev->ifindex;
+ } else if (netif_is_l3_slave(dev)) {
+ struct net_device *master;
+ struct net_device *_dev = (struct net_device *)dev;
+
+ /* netdev_master_upper_dev_get_rcu calls
+ * list_first_or_null_rcu to walk the upper dev list.
+ * list_first_or_null_rcu does not handle a const arg. We aren't
+ * making changes, just want the master device from that list so
+ * typecast to remove the const
+ */
+ master = netdev_master_upper_dev_get_rcu(_dev);
+ if (master)
+ ifindex = master->ifindex;
+ }
+
+ return ifindex;
+}
+EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
+
+/**
+ * l3mdev_fib_table - get FIB table id associated with an L3
+ * master interface
+ * @dev: targeted interface
+ */
+
+u32 l3mdev_fib_table_rcu(const struct net_device *dev)
+{
+ u32 tb_id = 0;
+
+ if (!dev)
+ return 0;
+
+ if (netif_is_l3_master(dev)) {
+ if (dev->l3mdev_ops->l3mdev_fib_table)
+ tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
+ } else if (netif_is_l3_slave(dev)) {
+ /* Users of netdev_master_upper_dev_get_rcu need non-const,
+ * but current inet_*type functions take a const
+ */
+ struct net_device *_dev = (struct net_device *) dev;
+ const struct net_device *master;
+
+ master = netdev_master_upper_dev_get_rcu(_dev);
+ if (master &&
+ master->l3mdev_ops->l3mdev_fib_table)
+ tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
+ }
+
+ return tb_id;
+}
+EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
+
+u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
+{
+ struct net_device *dev;
+ u32 tb_id = 0;
+
+ if (!ifindex)
+ return 0;
+
+ rcu_read_lock();
+
+ dev = dev_get_by_index_rcu(net, ifindex);
+ if (dev)
+ tb_id = l3mdev_fib_table_rcu(dev);
+
+ rcu_read_unlock();
+
+ return tb_id;
+}
+EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
+
+/**
+ * l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link
+ * local and multicast addresses
+ * @net: network namespace for device index lookup
+ * @fl6: IPv6 flow struct for lookup
+ */
+
+struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
+ struct flowi6 *fl6)
+{
+ struct dst_entry *dst = NULL;
+ struct net_device *dev;
+
+ if (fl6->flowi6_oif) {
+ rcu_read_lock();
+
+ dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
+ if (dev && netif_is_l3_slave(dev))
+ dev = netdev_master_upper_dev_get_rcu(dev);
+
+ if (dev && netif_is_l3_master(dev) &&
+ dev->l3mdev_ops->l3mdev_link_scope_lookup)
+ dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
+
+ rcu_read_unlock();
+ }
+
+ return dst;
+}
+EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
+
+/**
+ * l3mdev_fib_rule_match - Determine if flowi references an
+ * L3 master device
+ * @net: network namespace for device index lookup
+ * @fl: flow struct
+ */
+
+int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
+ struct fib_lookup_arg *arg)
+{
+ struct net_device *dev;
+ int rc = 0;
+
+ rcu_read_lock();
+
+ dev = dev_get_by_index_rcu(net, fl->flowi_oif);
+ if (dev && netif_is_l3_master(dev) &&
+ dev->l3mdev_ops->l3mdev_fib_table) {
+ arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
+ rc = 1;
+ goto out;
+ }
+
+ dev = dev_get_by_index_rcu(net, fl->flowi_iif);
+ if (dev && netif_is_l3_master(dev) &&
+ dev->l3mdev_ops->l3mdev_fib_table) {
+ arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
+ rc = 1;
+ goto out;
+ }
+
+out:
+ rcu_read_unlock();
+
+ return rc;
+}
+
+void l3mdev_update_flow(struct net *net, struct flowi *fl)
+{
+ struct net_device *dev;
+ int ifindex;
+
+ rcu_read_lock();
+
+ if (fl->flowi_oif) {
+ dev = dev_get_by_index_rcu(net, fl->flowi_oif);
+ if (dev) {
+ ifindex = l3mdev_master_ifindex_rcu(dev);
+ if (ifindex) {
+ fl->flowi_oif = ifindex;
+ fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
+ goto out;
+ }
+ }
+ }
+
+ if (fl->flowi_iif) {
+ dev = dev_get_by_index_rcu(net, fl->flowi_iif);
+ if (dev) {
+ ifindex = l3mdev_master_ifindex_rcu(dev);
+ if (ifindex) {
+ fl->flowi_iif = ifindex;
+ fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
+ }
+ }
+ }
+
+out:
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(l3mdev_update_flow);