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| author | Felix Fietkau <nbd@nbd.name> | 2018-02-26 10:15:21 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-04-24 10:28:54 +0200 |
| commit | 59c466dd68e796f3a7a0709d90c72ce2d84e29c2 (patch) | |
| tree | 0c0222d84d3a45a07d09416fe97ace13111b0f5b /net/netfilter/nf_flow_table_core.c | |
| parent | 6bdc3c68d94c5d6adc675ee55361962e9dd2489d (diff) | |
| download | op-kernel-dev-59c466dd68e796f3a7a0709d90c72ce2d84e29c2.zip op-kernel-dev-59c466dd68e796f3a7a0709d90c72ce2d84e29c2.tar.gz | |
netfilter: nf_flow_table: add a new flow state for tearing down offloading
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>
Diffstat (limited to 'net/netfilter/nf_flow_table_core.c')
| -rw-r--r-- | net/netfilter/nf_flow_table_core.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c index 0d38f20..5a81e4f 100644 --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -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: @@ -419,10 +421,14 @@ 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; + } - flow_offload_dead(flow); + if (flow->tuplehash[0].tuple.iifidx == dev->ifindex || + flow->tuplehash[1].tuple.iifidx == dev->ifindex) + flow_offload_dead(flow); } static void nf_flow_table_iterate_cleanup(struct nf_flowtable *flowtable, |
