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generic: 5.15: standardize tcp_no_window_check pending patch

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Standardize pending patch tcp_no_window_check patch as with
new kernel they added a check for global variables.
The 2 new condition are that they must be read-only or
the data pointer should not point to kernel/module global
data.
Remove the global variable and move it to a standard place
following other variables logic.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
This commit is contained in:
Ansuel Smith 2021-11-07 22:33:21 +01:00 committed by Daniel Golle
parent 483503603c
commit 92fb51bc98
1 changed files with 29 additions and 23 deletions
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52
target/linux/generic/pending-5.15/613-netfilter_optional_tcp_window_check.patch
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@ -8,21 +8,11 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -31,6 +31,9 @@
#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
+/* Do not check the TCP window for incoming packets */
+static int nf_ct_tcp_no_window_check __read_mostly = 1;
+
/* FIXME: Examine ipfilter's timeouts and conntrack transitions more
closely. They're more complex. --RR */
@@ -476,6 +479,9 @@ static bool tcp_in_window(const struct n
s32 receiver_offset;
bool res, in_recv_win;
+ if (nf_ct_tcp_no_window_check)
+ if (net->ct.sysctl_no_window_check)
+ return true;
+
/*
@ -33,22 +23,12 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
timeouts[new_state] > timeouts[TCP_CONNTRACK_UNACK])
timeout = timeouts[TCP_CONNTRACK_UNACK];
- else if (ct->proto.tcp.last_win == 0 &&
+ else if (!nf_ct_tcp_no_window_check && ct->proto.tcp.last_win == 0 &&
+ else if (!net->ct.sysctl_no_window_check && ct->proto.tcp.last_win == 0 &&
timeouts[new_state] > timeouts[TCP_CONNTRACK_RETRANS])
timeout = timeouts[TCP_CONNTRACK_RETRANS];
else
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -25,6 +25,9 @@
#include <net/netfilter/nf_conntrack_timestamp.h>
#include <linux/rculist_nulls.h>
+/* Do not check the TCP window for incoming packets */
+static int nf_ct_tcp_no_window_check __read_mostly = 1;
+
static bool enable_hooks __read_mostly;
MODULE_PARM_DESC(enable_hooks, "Always enable conntrack hooks");
module_param(enable_hooks, bool, 0000);
@@ -660,6 +663,7 @@ enum nf_ct_sysctl_index {
NF_SYSCTL_CT_PROTO_TIMEOUT_GRE_STREAM,
#endif
@ -63,7 +43,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
#endif
+ [NF_SYSCTL_CT_PROTO_TCP_NO_WINDOW_CHECK] = {
+ .procname = "nf_conntrack_tcp_no_window_check",
+ .data = &nf_ct_tcp_no_window_check,
+ .data = &init_net.ct.sysctl_no_window_check,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
@ -71,3 +51,29 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
{}
};
@@ -1164,6 +1164,7 @@ static int nf_conntrack_standalone_init_sysctl(struct net *net)
#ifdef CONFIG_NF_CONNTRACK_EVENTS
table[NF_SYSCTL_CT_EVENTS].data = &net->ct.sysctl_events;
#endif
+ table[NF_SYSCTL_CT_PROTO_TCP_NO_WINDOW_CHECK].data = &net->ct.sysctl_no_window_check;
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
table[NF_SYSCTL_CT_TIMESTAMP].data = &net->ct.sysctl_tstamp;
#endif
@@ -1220,6 +1220,7 @@
int ret;
net->ct.sysctl_checksum = 1;
+ net->ct.sysctl_no_window_check = 1;
ret = nf_conntrack_standalone_init_sysctl(net);
if (ret < 0)
--- a/include/net/netns/conntrack.h
+++ b/include/net/netns/conntrack.h
@@ -109,6 +109,7 @@ struct netns_ct {
u8 sysctl_auto_assign_helper;
u8 sysctl_tstamp;
u8 sysctl_checksum;
+ u8 sysctl_no_window_check;
struct ct_pcpu __percpu *pcpu_lists;
struct ip_conntrack_stat __percpu *stat;