kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 88 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.4/600-netfilter_conntrack_flush.patch b/target/linux/generic/pending-5.4/600-netfilter_conntrack_flush.patch
new file mode 100644
index 0000000000..fa32f88e17
--- /dev/null
+++ b/target/linux/generic/pending-5.4/600-netfilter_conntrack_flush.patch
@@ -0,0 +1,88 @@
+From: Felix Fietkau <nbd@nbd.name>
+Subject: netfilter: add support for flushing conntrack via /proc
+
+lede-commit 8193bbe59a74d34d6a26d4a8cb857b1952905314
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+ net/netfilter/nf_conntrack_standalone.c | 59 ++++++++++++++++++++++++++++++++-
+ 1 file changed, 58 insertions(+), 1 deletion(-)
+
+--- a/net/netfilter/nf_conntrack_standalone.c
++++ b/net/netfilter/nf_conntrack_standalone.c
+@@ -9,6 +9,7 @@
+ #include <linux/percpu.h>
+ #include <linux/netdevice.h>
+ #include <linux/security.h>
++#include <linux/inet.h>
+ #include <net/net_namespace.h>
+ #ifdef CONFIG_SYSCTL
+ #include <linux/sysctl.h>
+@@ -433,6 +434,56 @@ static int ct_cpu_seq_show(struct seq_fi
+ 	return 0;
+ }
+ 
++struct kill_request {
++	u16 family;
++	union nf_inet_addr addr;
++};
++
++static int kill_matching(struct nf_conn *i, void *data)
++{
++	struct kill_request *kr = data;
++	struct nf_conntrack_tuple *t1 = &i->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
++	struct nf_conntrack_tuple *t2 = &i->tuplehash[IP_CT_DIR_REPLY].tuple;
++
++	if (!kr->family)
++		return 1;
++
++	if (t1->src.l3num != kr->family)
++		return 0;
++
++	return (nf_inet_addr_cmp(&kr->addr, &t1->src.u3) ||
++	        nf_inet_addr_cmp(&kr->addr, &t1->dst.u3) ||
++	        nf_inet_addr_cmp(&kr->addr, &t2->src.u3) ||
++	        nf_inet_addr_cmp(&kr->addr, &t2->dst.u3));
++}
++
++static int ct_file_write(struct file *file, char *buf, size_t count)
++{
++	struct seq_file *seq = file->private_data;
++	struct net *net = seq_file_net(seq);
++	struct kill_request kr = { };
++
++	if (count == 0)
++		return 0;
++
++	if (count >= INET6_ADDRSTRLEN)
++		count = INET6_ADDRSTRLEN - 1;
++
++	if (strnchr(buf, count, ':')) {
++		kr.family = AF_INET6;
++		if (!in6_pton(buf, count, (void *)&kr.addr, '\n', NULL))
++			return -EINVAL;
++	} else if (strnchr(buf, count, '.')) {
++		kr.family = AF_INET;
++		if (!in4_pton(buf, count, (void *)&kr.addr, '\n', NULL))
++			return -EINVAL;
++	}
++
++	nf_ct_iterate_cleanup_net(net, kill_matching, &kr, 0, 0);
++
++	return 0;
++}
++
+ static const struct seq_operations ct_cpu_seq_ops = {
+ 	.start	= ct_cpu_seq_start,
+ 	.next	= ct_cpu_seq_next,
+@@ -446,8 +497,9 @@ static int nf_conntrack_standalone_init_
+ 	kuid_t root_uid;
+ 	kgid_t root_gid;
+ 
+-	pde = proc_create_net("nf_conntrack", 0440, net->proc_net, &ct_seq_ops,
+-			sizeof(struct ct_iter_state));
++	pde = proc_create_net_data_write("nf_conntrack", 0440, net->proc_net,
++					 &ct_seq_ops, &ct_file_write,
++					 sizeof(struct ct_iter_state), NULL);
+ 	if (!pde)
+ 		goto out_nf_conntrack;
+