diff options
Diffstat (limited to 'net/l3mdev')
| -rw-r--r-- | net/l3mdev/Kconfig | 2 | ||||
| -rw-r--r-- | net/l3mdev/Makefile | 2 | ||||
| -rw-r--r-- | net/l3mdev/l3mdev.c | 145 |
3 files changed, 117 insertions, 32 deletions
diff --git a/net/l3mdev/Kconfig b/net/l3mdev/Kconfig index de186dff8f63..2b2861e1fb7d 100644 --- a/net/l3mdev/Kconfig +++ b/net/l3mdev/Kconfig @@ -6,6 +6,6 @@ config NET_L3_MASTER_DEV bool "L3 Master device support" depends on INET || IPV6 - ---help--- + help This module provides glue between core networking code and device drivers to support L3 master devices like VRF. diff --git a/net/l3mdev/Makefile b/net/l3mdev/Makefile index 59755a9e2f9b..9e7da0acc58c 100644 --- a/net/l3mdev/Makefile +++ b/net/l3mdev/Makefile @@ -3,4 +3,4 @@ # Makefile for the L3 device API # -obj-$(CONFIG_NET_L3_MASTER_DEV) += l3mdev.o +obj-y += l3mdev.o diff --git a/net/l3mdev/l3mdev.c b/net/l3mdev/l3mdev.c index f35899d45a9a..ca10916340b0 100644 --- a/net/l3mdev/l3mdev.c +++ b/net/l3mdev/l3mdev.c @@ -9,8 +9,101 @@ #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 + * l3mdev_master_ifindex_rcu - get index of L3 master device * @dev: targeted interface */ @@ -43,7 +136,7 @@ int l3mdev_master_ifindex_rcu(const struct net_device *dev) EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu); /** - * l3mdev_master_upper_ifindex_by_index - get index of upper l3 master + * l3mdev_master_upper_ifindex_by_index_rcu - get index of upper l3 master * device * @net: network namespace for device index lookup * @ifindex: targeted interface @@ -54,14 +147,14 @@ int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex) dev = dev_get_by_index_rcu(net, ifindex); while (dev && !netif_is_l3_master(dev)) - dev = netdev_master_upper_dev_get(dev); + dev = netdev_master_upper_dev_get_rcu(dev); return dev ? dev->ifindex : 0; } EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu); /** - * l3mdev_fib_table - get FIB table id associated with an L3 + * l3mdev_fib_table_rcu - get FIB table id associated with an L3 * master interface * @dev: targeted interface */ @@ -148,6 +241,7 @@ EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup); * L3 master device * @net: network namespace for device index lookup * @fl: flow struct + * @arg: store the table the rule matched with here */ int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, @@ -156,25 +250,19 @@ int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, struct net_device *dev; int rc = 0; - rcu_read_lock(); + /* update flow ensures flowi_l3mdev is set when relevant */ + if (!fl->flowi_l3mdev) + return 0; - 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; - } + rcu_read_lock(); - dev = dev_get_by_index_rcu(net, fl->flowi_iif); + dev = dev_get_by_index_rcu(net, fl->flowi_l3mdev); 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; @@ -183,31 +271,28 @@ out: 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_l3mdev) + fl->flowi_l3mdev = l3mdev_master_ifindex_rcu(dev); + + /* oif set to L3mdev directs lookup to its table; + * reset to avoid oif match in fib_lookup + */ + if (netif_is_l3_master(dev)) + fl->flowi_oif = 0; + goto out; } } - if (fl->flowi_iif) { + if (fl->flowi_iif > LOOPBACK_IFINDEX && !fl->flowi_l3mdev) { 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; - } - } + if (dev) + fl->flowi_l3mdev = l3mdev_master_ifindex_rcu(dev); } out: |