diff options
author | Andrea Mayer <andrea.mayer@uniroma2.it> | 2020-06-20 01:54:43 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2020-06-21 03:22:22 +0300 |
commit | 49042c220b3a31e25902b36df71b23dc10efa0b8 (patch) | |
tree | b8c373b905cf92b3b1a3efe98a82433ac6fcb195 | |
parent | c5eb179edd8a169949b1fb153ecfd04649a71c8d (diff) |
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@uniroma2.it>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | include/net/l3mdev.h | 39 | ||||
-rw-r--r-- | net/l3mdev/l3mdev.c | 93 |
2 files changed, 132 insertions, 0 deletions
diff --git a/include/net/l3mdev.h b/include/net/l3mdev.h index e942372b077b..031c661aa14d 100644 --- a/include/net/l3mdev.h +++ b/include/net/l3mdev.h @@ -10,6 +10,16 @@ #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) + +typedef int (*lookup_by_table_id_t)(struct net *net, u32 table_d); + /** * struct l3mdev_ops - l3mdev operations * @@ -37,6 +47,15 @@ struct l3mdev_ops { #ifdef CONFIG_NET_L3_MASTER_DEV +int l3mdev_table_lookup_register(enum l3mdev_type l3type, + lookup_by_table_id_t fn); + +void l3mdev_table_lookup_unregister(enum l3mdev_type l3type, + lookup_by_table_id_t fn); + +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); @@ -281,6 +300,26 @@ struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) } static inline +int l3mdev_table_lookup_register(enum l3mdev_type l3type, + lookup_by_table_id_t fn) +{ + return -EOPNOTSUPP; +} + +static inline +void l3mdev_table_lookup_unregister(enum l3mdev_type l3type, + lookup_by_table_id_t fn) +{ +} + +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..e71ca5aec684 100644 --- a/net/l3mdev/l3mdev.c +++ b/net/l3mdev/l3mdev.c @@ -9,6 +9,99 @@ #include <net/fib_rules.h> #include <net/l3mdev.h> +static DEFINE_SPINLOCK(l3mdev_lock); + +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 |