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--- 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>
@@ -288,10 +289,66 @@ 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, 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,
};
@@ -393,7 +450,7 @@ static int nf_conntrack_standalone_init_
{
struct proc_dir_entry *pde;
- 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;
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