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net: flow_offload: add list handling functions

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This patch adds the list handling functions for the flow block API:

* flow_block_cb_lookup() allows drivers to look up for existing flow blocks.
* flow_block_cb_add() adds a flow block to the per driver list to be registered
  by the core.
* flow_block_cb_remove() to remove a flow block from the list of existing
  flow blocks per driver and to request the core to unregister this.

The flow block API also annotates the netns this flow block belongs to.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pablo Neira Ayuso
2019-07-09 22:55:43 +02:00
committed by David S. Miller
parent d63db30c85
commit da3eeb904f
3 changed files with 39 additions and 0 deletions
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net/core/flow_offload.c
+17
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@@ -176,6 +176,7 @@ struct flow_block_cb *flow_block_cb_alloc(struct net *net, tc_setup_cb_t *cb,
if (!block_cb)
return ERR_PTR(-ENOMEM);
block_cb->net = net;
block_cb->cb = cb;
block_cb->cb_ident = cb_ident;
block_cb->cb_priv = cb_priv;
@@ -194,6 +195,22 @@ void flow_block_cb_free(struct flow_block_cb *block_cb)
}
EXPORT_SYMBOL(flow_block_cb_free);
struct flow_block_cb *flow_block_cb_lookup(struct flow_block_offload *f,
tc_setup_cb_t *cb, void *cb_ident)
{
struct flow_block_cb *block_cb;
list_for_each_entry(block_cb, f->driver_block_list, driver_list) {
if (block_cb->net == f->net &&
block_cb->cb == cb &&
block_cb->cb_ident == cb_ident)
return block_cb;
}
return NULL;
}
EXPORT_SYMBOL(flow_block_cb_lookup);
int flow_block_cb_setup_simple(struct flow_block_offload *f,
struct list_head *driver_block_list,
tc_setup_cb_t *cb, void *cb_ident, void *cb_priv,