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netfilter: conntrack: remove offload_pickup sysctl again

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These two sysctls were added because the hardcoded defaults (2 minutes,
tcp, 30 seconds, udp) turned out to be too low for some setups.

They appeared in 5.14-rc1 so it should be fine to remove it again.

Marcelo convinced me that there should be no difference between a flow
that was offloaded vs. a flow that was not wrt. timeout handling.
Thus the default is changed to those for TCP established and UDP stream,
5 days and 120 seconds, respectively.

Marcelo also suggested to account for the timeout value used for the
offloading, this avoids increase beyond the value in the conntrack-sysctl
and will also instantly expire the conntrack entry with altered sysctls.

Example:
   nf_conntrack_udp_timeout_stream=60
   nf_flowtable_udp_timeout=60

This will remove offloaded udp flows after one minute, rather than two.

An earlier version of this patch also cleared the ASSURED bit to
allow nf_conntrack to evict the entry via early_drop (i.e., table full).
However, it looks like we can safely assume that connection timed out
via HW is still in established state, so this isn't needed.

Quoting Oz:
 [..] the hardware sends all packets with a set FIN flags to sw.
 [..] Connections that are aged in hardware are expected to be in the
 established state.

In case it turns out that back-to-sw-path transition can occur for
'dodgy' connections too (e.g., one side disappeared while software-path
would have been in RETRANS timeout), we can adjust this later.

Cc: Oz Shlomo <ozsh@nvidia.com>
Cc: Paul Blakey <paulb@nvidia.com>
Suggested-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2021-08-04 15:02:15 +02:00 committed by Pablo Neira Ayuso
parent 69311e7c99
commit 4592ee7f52
6 changed files with 8 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/networking/nf_conntrack-sysctl.rst
View File

@ -191,19 +191,9 @@ nf_flowtable_tcp_timeout - INTEGER (seconds)
TCP connections may be offloaded from nf conntrack to nf flow table.
Once aged, the connection is returned to nf conntrack with tcp pickup timeout.
nf_flowtable_tcp_pickup - INTEGER (seconds)
default 120
TCP connection timeout after being aged from nf flow table offload.
nf_flowtable_udp_timeout - INTEGER (seconds)
default 30
Control offload timeout for udp connections.
UDP connections may be offloaded from nf conntrack to nf flow table.
Once aged, the connection is returned to nf conntrack with udp pickup timeout.
nf_flowtable_udp_pickup - INTEGER (seconds)
default 30
UDP connection timeout after being aged from nf flow table offload.

2
include/net/netns/conntrack.h
View File

@ -30,7 +30,6 @@ struct nf_tcp_net {
u8 tcp_ignore_invalid_rst;
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
unsigned int offload_timeout;
unsigned int offload_pickup;
#endif
};
@ -44,7 +43,6 @@ struct nf_udp_net {
unsigned int timeouts[UDP_CT_MAX];
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
unsigned int offload_timeout;
unsigned int offload_pickup;
#endif
};

1
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -1478,7 +1478,6 @@ void nf_conntrack_tcp_init_net(struct net *net)
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
tn->offload_timeout = 30 * HZ;
tn->offload_pickup = 120 * HZ;
#endif
}

1
net/netfilter/nf_conntrack_proto_udp.c
View File

@ -271,7 +271,6 @@ void nf_conntrack_udp_init_net(struct net *net)
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
un->offload_timeout = 30 * HZ;
un->offload_pickup = 30 * HZ;
#endif
}

16
net/netfilter/nf_conntrack_standalone.c
View File

@ -575,7 +575,6 @@ enum nf_ct_sysctl_index {
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_UNACK,
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD_PICKUP,
#endif
NF_SYSCTL_CT_PROTO_TCP_LOOSE,
NF_SYSCTL_CT_PROTO_TCP_LIBERAL,
@ -585,7 +584,6 @@ enum nf_ct_sysctl_index {
NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM,
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD,
NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD_PICKUP,
#endif
NF_SYSCTL_CT_PROTO_TIMEOUT_ICMP,
NF_SYSCTL_CT_PROTO_TIMEOUT_ICMPV6,
@ -776,12 +774,6 @@ static struct ctl_table nf_ct_sysctl_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD_PICKUP] = {
.procname = "nf_flowtable_tcp_pickup",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#endif
[NF_SYSCTL_CT_PROTO_TCP_LOOSE] = {
.procname = "nf_conntrack_tcp_loose",
@ -832,12 +824,6 @@ static struct ctl_table nf_ct_sysctl_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD_PICKUP] = {
.procname = "nf_flowtable_udp_pickup",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#endif
[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMP] = {
.procname = "nf_conntrack_icmp_timeout",
@ -1018,7 +1004,6 @@ static void nf_conntrack_standalone_init_tcp_sysctl(struct net *net,
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
table[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD].data = &tn->offload_timeout;
table[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD_PICKUP].data = &tn->offload_pickup;
#endif
}
@ -1111,7 +1096,6 @@ static int nf_conntrack_standalone_init_sysctl(struct net *net)
table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM].data = &un->timeouts[UDP_CT_REPLIED];
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD].data = &un->offload_timeout;
table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD_PICKUP].data = &un->offload_pickup;
#endif
nf_conntrack_standalone_init_tcp_sysctl(net, table);

11
net/netfilter/nf_flow_table_core.c
View File

@ -183,7 +183,7 @@ static void flow_offload_fixup_ct_timeout(struct nf_conn *ct)
const struct nf_conntrack_l4proto *l4proto;
struct net *net = nf_ct_net(ct);
int l4num = nf_ct_protonum(ct);
unsigned int timeout;
s32 timeout;
l4proto = nf_ct_l4proto_find(l4num);
if (!l4proto)
@ -192,15 +192,20 @@ static void flow_offload_fixup_ct_timeout(struct nf_conn *ct)
if (l4num == IPPROTO_TCP) {
struct nf_tcp_net *tn = nf_tcp_pernet(net);
timeout = tn->offload_pickup;
timeout = tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
timeout -= tn->offload_timeout;
} else if (l4num == IPPROTO_UDP) {
struct nf_udp_net *tn = nf_udp_pernet(net);
timeout = tn->offload_pickup;
timeout = tn->timeouts[UDP_CT_REPLIED];
timeout -= tn->offload_timeout;
} else {
return;
}
if (timeout < 0)
timeout = 0;
if (nf_flow_timeout_delta(ct->timeout) > (__s32)timeout)
ct->timeout = nfct_time_stamp + timeout;
}