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netfilter: flowtable: refresh flow if hardware offload fails

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If nf_flow_offload_add() fails to add the flow to hardware, then the
NF_FLOW_HW_REFRESH flag bit is set and the flow remains in the flowtable
software path.

If flowtable hardware offload is enabled, this patch enqueues a new
request to offload this flow to hardware.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-01-06 12:56:47 +01:00
parent a5449cdcaa
commit f698fe4082
4 changed files with 22 additions and 10 deletions
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1
include/net/netfilter/nf_flow_table.h
View File

@ -95,6 +95,7 @@ enum nf_flow_flags {
NF_FLOW_HW,
NF_FLOW_HW_DYING,
NF_FLOW_HW_DEAD,
NF_FLOW_HW_REFRESH,
};
enum flow_offload_type {

4
net/netfilter/nf_flow_table_core.c
View File

@ -243,8 +243,10 @@ int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)
return err;
}
if (nf_flowtable_hw_offload(flow_table))
if (nf_flowtable_hw_offload(flow_table)) {
__set_bit(NF_FLOW_HW, &flow->flags);
nf_flow_offload_add(flow_table, flow);
}
return 0;
}

13
net/netfilter/nf_flow_table_ip.c
View File

@ -232,6 +232,13 @@ static unsigned int nf_flow_xmit_xfrm(struct sk_buff *skb,
return NF_STOLEN;
}
static bool nf_flow_offload_refresh(struct nf_flowtable *flow_table,
struct flow_offload *flow)
{
return nf_flowtable_hw_offload(flow_table) &&
test_and_clear_bit(NF_FLOW_HW_REFRESH, &flow->flags);
}
unsigned int
nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
@ -272,6 +279,9 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
if (nf_flow_state_check(flow, ip_hdr(skb)->protocol, skb, thoff))
return NF_ACCEPT;
if (unlikely(nf_flow_offload_refresh(flow_table, flow)))
nf_flow_offload_add(flow_table, flow);
if (nf_flow_offload_dst_check(&rt->dst)) {
flow_offload_teardown(flow);
return NF_ACCEPT;
@ -498,6 +508,9 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
sizeof(*ip6h)))
return NF_ACCEPT;
if (unlikely(nf_flow_offload_refresh(flow_table, flow)))
nf_flow_offload_add(flow_table, flow);
if (nf_flow_offload_dst_check(&rt->dst)) {
flow_offload_teardown(flow);
return NF_ACCEPT;

14
net/netfilter/nf_flow_table_offload.c
View File

@ -654,20 +654,20 @@ static int flow_offload_rule_add(struct flow_offload_work *offload,
return 0;
}
static int flow_offload_work_add(struct flow_offload_work *offload)
static void flow_offload_work_add(struct flow_offload_work *offload)
{
struct nf_flow_rule *flow_rule[FLOW_OFFLOAD_DIR_MAX];
int err;
err = nf_flow_offload_alloc(offload, flow_rule);
if (err < 0)
return -ENOMEM;
return;
err = flow_offload_rule_add(offload, flow_rule);
if (err < 0)
set_bit(NF_FLOW_HW_REFRESH, &offload->flow->flags);
nf_flow_offload_destroy(flow_rule);
return err;
}
static void flow_offload_work_del(struct flow_offload_work *offload)
@ -712,7 +712,6 @@ static void flow_offload_work_handler(struct work_struct *work)
{
struct flow_offload_work *offload, *next;
LIST_HEAD(offload_pending_list);
int ret;
spin_lock_bh(&flow_offload_pending_list_lock);
list_replace_init(&flow_offload_pending_list, &offload_pending_list);
@ -721,9 +720,7 @@ static void flow_offload_work_handler(struct work_struct *work)
list_for_each_entry_safe(offload, next, &offload_pending_list, list) {
switch (offload->cmd) {
case FLOW_CLS_REPLACE:
ret = flow_offload_work_add(offload);
if (ret < 0)
__clear_bit(NF_FLOW_HW, &offload->flow->flags);
flow_offload_work_add(offload);
break;
case FLOW_CLS_DESTROY:
flow_offload_work_del(offload);
@ -776,7 +773,6 @@ void nf_flow_offload_add(struct nf_flowtable *flowtable,
if (!offload)
return;
__set_bit(NF_FLOW_HW, &flow->flags);
flow_offload_queue_work(offload);
}