kernel: generic: Add kernel 4.14 support

[openwrt/openwrt.git] / target / linux / generic / pending-4.14 / 600-netfilter_conntrack_flush.patch

diff --git a/target/linux/generic/pending-4.14/600-netfilter_conntrack_flush.patch b/target/linux/generic/pending-4.14/600-netfilter_conntrack_flush.patch
new file mode 100644 (file)
index 0000000..f39ed62
--- /dev/null
+++ b/target/linux/generic/pending-4.14/600-netfilter_conntrack_flush.patch
@@ -0,0 +1,95 @@
+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
+@@ -17,6 +17,7 @@
+ #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>
+@@ -377,10 +378,66 @@ static int ct_open(struct inode *inode,
+                       sizeof(struct ct_iter_state));
+ }
+ 
++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 ssize_t ct_file_write(struct file *file, const char __user *buf,
++                           size_t count, loff_t *ppos)
++{
++      struct seq_file *seq = file->private_data;
++      struct net *net = seq_file_net(seq);
++      struct kill_request kr = { };
++      char req[INET6_ADDRSTRLEN] = { };
++
++      if (count == 0)
++              return 0;
++
++      if (count >= INET6_ADDRSTRLEN)
++              count = INET6_ADDRSTRLEN - 1;
++
++      if (copy_from_user(req, buf, count))
++              return -EFAULT;
++
++      if (strnchr(req, count, ':')) {
++              kr.family = AF_INET6;
++              if (!in6_pton(req, count, (void *)&kr.addr, '\n', NULL))
++                      return -EINVAL;
++      } else if (strnchr(req, count, '.')) {
++              kr.family = AF_INET;
++              if (!in4_pton(req, count, (void *)&kr.addr, '\n', NULL))
++                      return -EINVAL;
++      }
++
++      nf_ct_iterate_cleanup_net(net, kill_matching, &kr, 0, 0);
++
++      return count;
++}
++
+ static const struct file_operations ct_file_ops = {
+       .owner   = THIS_MODULE,
+       .open    = ct_open,
+       .read    = seq_read,
++      .write   = ct_file_write,
+       .llseek  = seq_lseek,
+       .release = seq_release_net,
+ };
+@@ -484,7 +541,7 @@ static int nf_conntrack_standalone_init_
+       kuid_t root_uid;
+       kgid_t root_gid;
+ 
+-      pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
++      pde = proc_create("nf_conntrack", 0660, net->proc_net, &ct_file_ops);
+       if (!pde)
+               goto out_nf_conntrack;
+