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netfilter: flowtable: add nf_flowtable_time_stamp 

This patch adds nf_flowtable_time_stamp and updates the existing code to
use it.

This patch is also implicitly fixing up hardware statistic fetching via
nf_flow_offload_stats() where casting to u32 is missing. Use
nf_flow_timeout_delta() to fix this.

Fixes: c29f74e0df ("netfilter: nf_flow_table: hardware offload support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: wenxu <wenxu@ucloud.cn>
This commit is contained in:
Pablo Neira Ayuso 2020-01-03 18:10:04 +01:00
parent 5acab91458
commit fb46f1b780
4 changed files with 11 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/netfilter/nf_flow_table.h
View File

@ -106,6 +106,12 @@ struct flow_offload {
};
#define NF_FLOW_TIMEOUT (30 * HZ)
#define nf_flowtable_time_stamp (u32)jiffies
static inline __s32 nf_flow_timeout_delta(unsigned int timeout)
{
return (__s32)(timeout - nf_flowtable_time_stamp);
}
struct nf_flow_route {
struct {

7
net/netfilter/nf_flow_table_core.c
View File

@ -134,11 +134,6 @@ static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp)
#define NF_FLOWTABLE_TCP_PICKUP_TIMEOUT (120 * HZ)
#define NF_FLOWTABLE_UDP_PICKUP_TIMEOUT (30 * HZ)
static inline __s32 nf_flow_timeout_delta(unsigned int timeout)
{
return (__s32)(timeout - (u32)jiffies);
}
static void flow_offload_fixup_ct_timeout(struct nf_conn *ct)
{
const struct nf_conntrack_l4proto *l4proto;
@ -232,7 +227,7 @@ int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)
{
int err;
flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT;
flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT;
err = rhashtable_insert_fast(&flow_table->rhashtable,
&flow->tuplehash[0].node,

4
net/netfilter/nf_flow_table_ip.c
View File

@ -280,7 +280,7 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
if (nf_flow_nat_ip(flow, skb, thoff, dir) < 0)
return NF_DROP;
flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT;
flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT;
iph = ip_hdr(skb);
ip_decrease_ttl(iph);
skb->tstamp = 0;
@ -509,7 +509,7 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
if (nf_flow_nat_ipv6(flow, skb, dir) < 0)
return NF_DROP;
flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT;
flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT;
ip6h = ipv6_hdr(skb);
ip6h->hop_limit--;
skb->tstamp = 0;

4
net/netfilter/nf_flow_table_offload.c
View File

@ -781,9 +781,9 @@ void nf_flow_offload_stats(struct nf_flowtable *flowtable,
struct flow_offload *flow)
{
struct flow_offload_work *offload;
s64 delta;
__s32 delta;
delta = flow->timeout - jiffies;
delta = nf_flow_timeout_delta(flow->timeout);
if ((delta >= (9 * NF_FLOW_TIMEOUT) / 10) ||
flow->flags & FLOW_OFFLOAD_HW_DYING)
return;