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@xxxxxxxxxxx>
---
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
