diff options
Diffstat (limited to 'kernel/linux/net/bridge/netfilter/ebtable_broute.c')
-rw-r--r-- | kernel/linux/net/bridge/netfilter/ebtable_broute.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/kernel/linux/net/bridge/netfilter/ebtable_broute.c b/kernel/linux/net/bridge/netfilter/ebtable_broute.c new file mode 100644 index 0000000..ce880a2 --- /dev/null +++ b/kernel/linux/net/bridge/netfilter/ebtable_broute.c @@ -0,0 +1,80 @@ +/* + * ebtable_broute + * + * Authors: + * Bart De Schuymer <bart.de.schuymer@pandora.be> + * + * April, 2002 + * + * This table lets you choose between routing and bridging for frames + * entering on a bridge enslaved nic. This table is traversed before any + * other ebtables table. See net/bridge/br_input.c. + */ + +#include <linux/netfilter_bridge/ebtables.h> +#include <linux/netfilter_bridge.h> +#include <linux/netdevice.h> +#include <linux/module.h> +#include <linux/if_bridge.h> +#include <linux/brlock.h> + +// EBT_ACCEPT means the frame will be bridged +// EBT_DROP means the frame will be routed +static struct ebt_entries initial_chain = + {0, EBT_ACCEPT, 0}; + +static struct ebt_replace initial_table = +{ + "broute", 1 << NF_BR_BROUTING, 0, sizeof(struct ebt_entries), + { [NF_BR_BROUTING]&initial_chain}, {}, + 0, NULL, (char *)&initial_chain +}; + +static int check(const struct ebt_table_info *info, unsigned int valid_hooks) +{ + if (valid_hooks & ~(1 << NF_BR_BROUTING)) + return -EINVAL; + return 0; +} + +static struct ebt_table broute_table = +{ + {NULL, NULL}, "broute", &initial_table, 1 << NF_BR_BROUTING, + RW_LOCK_UNLOCKED, check, NULL +}; + +static unsigned int +ebt_broute (unsigned int hook, struct sk_buff **pskb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + return ebt_do_table(hook, pskb, in, out, &broute_table); +} + +static int __init init(void) +{ + int ret; + + ret = ebt_register_table(&broute_table); + if (ret < 0) + return ret; + br_write_lock_bh(BR_NETPROTO_LOCK); + // in br_input.c, br_handle_frame() wants to call broute_decision() + broute_decision = ebt_broute; + br_write_unlock_bh(BR_NETPROTO_LOCK); + return ret; +} + +static void __exit fini(void) +{ + br_write_lock_bh(BR_NETPROTO_LOCK); + broute_decision = NULL; + br_write_unlock_bh(BR_NETPROTO_LOCK); + ebt_unregister_table(&broute_table); +} + +module_init(init); +module_exit(fini); +EXPORT_NO_SYMBOLS; +MODULE_LICENSE("GPL"); |