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net: flow_offload: add flow_block_cb_is_busy() and use it

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This patch adds a function to check if flow block callback is already in
use.  Call this new function from flow_block_cb_setup_simple() and from
drivers.

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 22:55:48 +02:00
committed by David S. Miller
parent 722d36e6e2
commit 0d4fd02e71
7 changed files with 39 additions and 0 deletions
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18
net/core/flow_offload.c
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@@ -228,6 +228,21 @@ unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb)
}
EXPORT_SYMBOL(flow_block_cb_decref);
bool flow_block_cb_is_busy(tc_setup_cb_t *cb, void *cb_ident,
struct list_head *driver_block_list)
{
struct flow_block_cb *block_cb;
list_for_each_entry(block_cb, driver_block_list, driver_list) {
if (block_cb->cb == cb &&
block_cb->cb_ident == cb_ident)
return true;
}
return false;
}
EXPORT_SYMBOL(flow_block_cb_is_busy);
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,
@@ -243,6 +258,9 @@ int flow_block_cb_setup_simple(struct flow_block_offload *f,
switch (f->command) {
case FLOW_BLOCK_BIND:
if (flow_block_cb_is_busy(cb, cb_ident, driver_block_list))
return -EBUSY;
block_cb = flow_block_cb_alloc(f->net, cb, cb_ident,
cb_priv, NULL);
if (IS_ERR(block_cb))