You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.6 KiB
96 lines
2.6 KiB
![]()
7 years ago
|
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;
|
||
|
|