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netfilter: flowtable: Add API for registering to flow table events

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Let drivers to add their cb allowing them to receive flow offload events
of type TC_SETUP_CLSFLOWER (REPLACE/DEL/STATS) for flows managed by the
flow table.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Blakey 2020-03-12 12:23:05 +02:00 committed by David S. Miller
parent c6fe5729dc
commit 978703f425
3 changed files with 57 additions and 0 deletions
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6
include/net/netfilter/nf_flow_table.h
View File

@ -44,6 +44,7 @@ struct nf_flowtable {
struct delayed_work gc_work;
unsigned int flags;
struct flow_block flow_block;
struct mutex flow_block_lock; /* Guards flow_block */
possible_net_t net;
};
@ -129,6 +130,11 @@ struct nf_flow_route {
struct flow_offload *flow_offload_alloc(struct nf_conn *ct);
void flow_offload_free(struct flow_offload *flow);
int nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv);
void nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv);
int flow_offload_route_init(struct flow_offload *flow,
const struct nf_flow_route *route);

47
net/netfilter/nf_flow_table_core.c
View File

@ -372,6 +372,50 @@ static void nf_flow_offload_work_gc(struct work_struct *work)
queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ);
}
int nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
{
struct flow_block *block = &flow_table->flow_block;
struct flow_block_cb *block_cb;
int err = 0;
mutex_lock(&flow_table->flow_block_lock);
block_cb = flow_block_cb_lookup(block, cb, cb_priv);
if (block_cb) {
err = -EEXIST;
goto unlock;
}
block_cb = flow_block_cb_alloc(cb, cb_priv, cb_priv, NULL);
if (IS_ERR(block_cb)) {
err = PTR_ERR(block_cb);
goto unlock;
}
list_add_tail(&block_cb->list, &block->cb_list);
unlock:
mutex_unlock(&flow_table->flow_block_lock);
return err;
}
EXPORT_SYMBOL_GPL(nf_flow_table_offload_add_cb);
void nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
{
struct flow_block *block = &flow_table->flow_block;
struct flow_block_cb *block_cb;
mutex_lock(&flow_table->flow_block_lock);
block_cb = flow_block_cb_lookup(block, cb, cb_priv);
if (block_cb)
list_del(&block_cb->list);
else
WARN_ON(true);
mutex_unlock(&flow_table->flow_block_lock);
}
EXPORT_SYMBOL_GPL(nf_flow_table_offload_del_cb);
static int nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff,
__be16 port, __be16 new_port)
{
@ -494,6 +538,7 @@ int nf_flow_table_init(struct nf_flowtable *flowtable)
INIT_DEFERRABLE_WORK(&flowtable->gc_work, nf_flow_offload_work_gc);
flow_block_init(&flowtable->flow_block);
mutex_init(&flowtable->flow_block_lock);
err = rhashtable_init(&flowtable->rhashtable,
&nf_flow_offload_rhash_params);
@ -550,11 +595,13 @@ void nf_flow_table_free(struct nf_flowtable *flow_table)
mutex_lock(&flowtable_lock);
list_del(&flow_table->list);
mutex_unlock(&flowtable_lock);
cancel_delayed_work_sync(&flow_table->gc_work);
nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL);
nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, flow_table);
nf_flow_table_offload_flush(flow_table);
rhashtable_destroy(&flow_table->rhashtable);
mutex_destroy(&flow_table->flow_block_lock);
}
EXPORT_SYMBOL_GPL(nf_flow_table_free);

4
net/netfilter/nf_flow_table_offload.c
View File

@ -610,6 +610,7 @@ static int nf_flow_offload_tuple(struct nf_flowtable *flowtable,
if (cmd == FLOW_CLS_REPLACE)
cls_flow.rule = flow_rule->rule;
mutex_lock(&flowtable->flow_block_lock);
list_for_each_entry(block_cb, block_cb_list, list) {
err = block_cb->cb(TC_SETUP_CLSFLOWER, &cls_flow,
block_cb->cb_priv);
@ -618,6 +619,7 @@ static int nf_flow_offload_tuple(struct nf_flowtable *flowtable,
i++;
}
mutex_unlock(&flowtable->flow_block_lock);
return i;
}
@ -692,8 +694,10 @@ static void flow_offload_tuple_stats(struct flow_offload_work *offload,
FLOW_CLS_STATS,
&offload->flow->tuplehash[dir].tuple, &extack);
mutex_lock(&flowtable->flow_block_lock);
list_for_each_entry(block_cb, &flowtable->flow_block.cb_list, list)
block_cb->cb(TC_SETUP_CLSFLOWER, &cls_flow, block_cb->cb_priv);
mutex_unlock(&flowtable->flow_block_lock);
memcpy(stats, &cls_flow.stats, sizeof(*stats));
}