netdev - [RFC,net-next, 1/5] l3mdev: add infrastructure for table to VRF mapping

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Date:   Fri, 12 Jun 2020 18:49:33 +0200
From:   Andrea Mayer <andrea.mayer@...roma2.it>
To:     David Ahern <dsahern@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Shrijeet Mukherjee <shrijeet@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Shuah Khan <shuah@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc:     Donald Sharp <sharpd@...ulusnetworks.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Dinesh Dutt <didutt@...il.com>,
        Stefano Salsano <stefano.salsano@...roma2.it>,
        Paolo Lungaroni <paolo.lungaroni@...t.it>,
        Ahmed Abdelsalam <ahabdels@...il.com>,
        Andrea Mayer <andrea.mayer@...roma2.it>
Subject: [RFC,net-next, 1/5] l3mdev: add infrastructure for table to VRF mapping

Add infrastructure to l3mdev (the core code for Layer 3 master devices) in
order to find out the corresponding VRF device for a given table id.
Therefore, the l3mdev implementations:
 - can register a callback that returns the device index of the l3mdev
   associated with a given table id;
 - can offer the lookup function (table to VRF device).

Signed-off-by: Andrea Mayer <andrea.mayer@...roma2.it>
---
 include/net/l3mdev.h | 37 +++++++++++++++++
 net/l3mdev/l3mdev.c  | 95 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 132 insertions(+)

diff --git a/include/net/l3mdev.h b/include/net/l3mdev.h
index e942372b077b..37aed117455f 100644
--- a/include/net/l3mdev.h
+++ b/include/net/l3mdev.h
@@ -10,6 +10,14 @@
 #include <net/dst.h>
 #include <net/fib_rules.h>
 
+enum l3mdev_type {
+	L3MDEV_TYPE_UNSPEC,
+	L3MDEV_TYPE_VRF,
+	__L3MDEV_TYPE_MAX
+};
+
+#define L3MDEV_TYPE_MAX (__L3MDEV_TYPE_MAX - 1)
+
 /**
  * struct l3mdev_ops - l3mdev operations
  *
@@ -37,6 +45,15 @@ struct l3mdev_ops {
 
 #ifdef CONFIG_NET_L3_MASTER_DEV
 
+int l3mdev_table_lookup_register(enum l3mdev_type l3type,
+				 int (*fn)(struct net *net, u32 table_id));
+
+void l3mdev_table_lookup_unregister(enum l3mdev_type l3type,
+				    int (*fn)(struct net *net, u32 table_id));
+
+int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net,
+				      u32 table_id);
+
 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
 			  struct fib_lookup_arg *arg);
 
@@ -280,6 +297,26 @@ struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
 	return skb;
 }
 
+static inline
+int l3mdev_table_lookup_register(enum l3mdev_type l3type,
+				 int (*fn)(struct net *net, u32 table_id))
+{
+	return -EOPNOTSUPP;
+}
+
+static inline
+void l3mdev_table_lookup_unregister(enum l3mdev_type l3type,
+				    int (*fn)(struct net *net, u32 table_id))
+{
+}
+
+static inline
+int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net,
+				      u32 table_id)
+{
+	return -ENODEV;
+}
+
 static inline
 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
 			  struct fib_lookup_arg *arg)
diff --git a/net/l3mdev/l3mdev.c b/net/l3mdev/l3mdev.c
index f35899d45a9a..6cc1fe7eb039 100644
--- a/net/l3mdev/l3mdev.c
+++ b/net/l3mdev/l3mdev.c
@@ -9,6 +9,101 @@
 #include <net/fib_rules.h>
 #include <net/l3mdev.h>
 
+DEFINE_SPINLOCK(l3mdev_lock);
+
+typedef int (*lookup_by_table_id_t)(struct net *net, u32 table_d);
+
+struct l3mdev_handler {
+	lookup_by_table_id_t dev_lookup;
+};
+
+static struct l3mdev_handler l3mdev_handlers[L3MDEV_TYPE_MAX + 1];
+
+static int l3mdev_check_type(enum l3mdev_type l3type)
+{
+	if (l3type <= L3MDEV_TYPE_UNSPEC || l3type > L3MDEV_TYPE_MAX)
+		return -EINVAL;
+
+	return 0;
+}
+
+int l3mdev_table_lookup_register(enum l3mdev_type l3type,
+				 lookup_by_table_id_t fn)
+{
+	struct l3mdev_handler *hdlr;
+	int res;
+
+	res = l3mdev_check_type(l3type);
+	if (res)
+		return res;
+
+	hdlr = &l3mdev_handlers[l3type];
+
+	spin_lock(&l3mdev_lock);
+
+	if (hdlr->dev_lookup) {
+		res = -EBUSY;
+		goto unlock;
+	}
+
+	hdlr->dev_lookup = fn;
+	res = 0;
+
+unlock:
+	spin_unlock(&l3mdev_lock);
+
+	return res;
+}
+EXPORT_SYMBOL_GPL(l3mdev_table_lookup_register);
+
+void l3mdev_table_lookup_unregister(enum l3mdev_type l3type,
+				    lookup_by_table_id_t fn)
+{
+	struct l3mdev_handler *hdlr;
+
+	if (l3mdev_check_type(l3type))
+		return;
+
+	hdlr = &l3mdev_handlers[l3type];
+
+	spin_lock(&l3mdev_lock);
+
+	if (hdlr->dev_lookup == fn)
+		hdlr->dev_lookup = NULL;
+
+	spin_unlock(&l3mdev_lock);
+}
+EXPORT_SYMBOL_GPL(l3mdev_table_lookup_unregister);
+
+int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type,
+				      struct net *net, u32 table_id)
+{
+	lookup_by_table_id_t lookup;
+	struct l3mdev_handler *hdlr;
+	int ifindex = -EINVAL;
+	int res;
+
+	res = l3mdev_check_type(l3type);
+	if (res)
+		return res;
+
+	hdlr = &l3mdev_handlers[l3type];
+
+	spin_lock(&l3mdev_lock);
+
+	lookup = hdlr->dev_lookup;
+	if (!lookup)
+		goto unlock;
+
+	ifindex = lookup(net, table_id);
+
+unlock:
+	spin_unlock(&l3mdev_lock);
+
+	return ifindex;
+}
+EXPORT_SYMBOL_GPL(l3mdev_ifindex_lookup_by_table_id);
+
 /**
  *	l3mdev_master_ifindex - get index of L3 master device
  *	@dev: targeted interface
-- 
2.20.1