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netfilter: nf_flow_table: add a new flow state for tearing down offloading

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On cleanup, this will be treated differently from FLOW_OFFLOAD_DYING:

If FLOW_OFFLOAD_DYING is set, the connection is going away, so both the
offload state and the connection tracking entry will be deleted.

If FLOW_OFFLOAD_TEARDOWN is set, the connection remains alive, but
the offload state is torn down. This is useful for cases that require
more complex state tracking / timeout handling on TCP, or if the
connection has been idle for too long.

Support for sending flows back to the slow path will be implemented in
a following patch

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Felix Fietkau 2018-02-26 10:15:21 +01:00 committed by Pablo Neira Ayuso
parent 6bdc3c68d9
commit 59c466dd68
2 changed files with 16 additions and 8 deletions
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2
include/net/netfilter/nf_flow_table.h
View File

@ -68,6 +68,7 @@ struct flow_offload_tuple_rhash {
#define FLOW_OFFLOAD_SNAT 0x1
#define FLOW_OFFLOAD_DNAT 0x2
#define FLOW_OFFLOAD_DYING 0x4
#define FLOW_OFFLOAD_TEARDOWN 0x8
struct flow_offload {
struct flow_offload_tuple_rhash tuplehash[FLOW_OFFLOAD_DIR_MAX];
@ -103,6 +104,7 @@ void nf_flow_table_cleanup(struct net *net, struct net_device *dev);
int nf_flow_table_init(struct nf_flowtable *flow_table);
void nf_flow_table_free(struct nf_flowtable *flow_table);
void flow_offload_teardown(struct flow_offload *flow);
static inline void flow_offload_dead(struct flow_offload *flow)
{
flow->flags |= FLOW_OFFLOAD_DYING;

20
net/netfilter/nf_flow_table_core.c
View File

@ -174,6 +174,12 @@ static void flow_offload_del(struct nf_flowtable *flow_table,
flow_offload_free(flow);
}
void flow_offload_teardown(struct flow_offload *flow)
{
flow->flags |= FLOW_OFFLOAD_TEARDOWN;
}
EXPORT_SYMBOL_GPL(flow_offload_teardown);
struct flow_offload_tuple_rhash *
flow_offload_lookup(struct nf_flowtable *flow_table,
struct flow_offload_tuple *tuple)
@ -226,11 +232,6 @@ static inline bool nf_flow_has_expired(const struct flow_offload *flow)
return (__s32)(flow->timeout - (u32)jiffies) <= 0;
}
static inline bool nf_flow_is_dying(const struct flow_offload *flow)
{
return flow->flags & FLOW_OFFLOAD_DYING;
}
static int nf_flow_offload_gc_step(struct nf_flowtable *flow_table)
{
struct flow_offload_tuple_rhash *tuplehash;
@ -258,7 +259,8 @@ static int nf_flow_offload_gc_step(struct nf_flowtable *flow_table)
flow = container_of(tuplehash, struct flow_offload, tuplehash[0]);
if (nf_flow_has_expired(flow) ||
nf_flow_is_dying(flow))
(flow->flags & (FLOW_OFFLOAD_DYING |
FLOW_OFFLOAD_TEARDOWN)))
flow_offload_del(flow_table, flow);
}
out:
@ -419,9 +421,13 @@ static void nf_flow_table_do_cleanup(struct flow_offload *flow, void *data)
{
struct net_device *dev = data;
if (dev && flow->tuplehash[0].tuple.iifidx != dev->ifindex)
if (!dev) {
flow_offload_teardown(flow);
return;
}
if (flow->tuplehash[0].tuple.iifidx == dev->ifindex ||
flow->tuplehash[1].tuple.iifidx == dev->ifindex)
flow_offload_dead(flow);
}