Commit 15084390 authored by jow's avatar jow
Browse files

BB: netfilter: support /proc conntrack flushing of specific ip addresses


Signed-off-by: default avatarJo-Philipp Wich <jow@openwrt.org>

Backport of r42092

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42094 3c298f89-4303-0410-b956-a3cf2f4a3e73
parent 8762cf47
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -268,10 +268,34 @@ static int ct_open(struct inode *inode,
@@ -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>
@@ -268,10 +269,63 @@ static int ct_open(struct inode *inode,
sizeof(struct ct_iter_state));
}
+static int kill_all(struct nf_conn *i, void *data)
+struct kill_request {
+ u16 family;
+ union nf_inet_addr addr;
+};
+
+static int kill_matching(struct nf_conn *i, void *data)
+{
+ return 1;
+ struct kill_request *kr = data;
+ struct nf_conntrack_tuple *t = &i->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+
+ if (!kr->family)
+ return 1;
+
+ if (t->src.l3num != kr->family)
+ return 0;
+
+ return (nf_inet_addr_cmp(&kr->addr, &t->src.u3) ||
+ nf_inet_addr_cmp(&kr->addr, &t->dst.u3));
+}
+
+static ssize_t ct_file_write(struct file *file, const char __user *buf,
......@@ -14,16 +37,30 @@
+{
+ struct seq_file *seq = file->private_data;
+ struct net *net = seq_file_net(seq);
+ struct kill_request kr = { };
+ char req[INET6_ADDRSTRLEN] = { };
+
+ if (count) {
+ char c;
+ if (count == 0)
+ return 0;
+
+ if (get_user(c, buf))
+ return -EFAULT;
+ if (count >= INET6_ADDRSTRLEN)
+ count = INET6_ADDRSTRLEN - 1;
+
+ if (c == 'f')
+ nf_ct_iterate_cleanup(net, kill_all, NULL);
+ 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);
+
+ return count;
+}
+
......@@ -35,7 +72,7 @@
.llseek = seq_lseek,
.release = seq_release_net,
};
@@ -373,7 +397,7 @@ static int nf_conntrack_standalone_init_
@@ -373,7 +427,7 @@ static int nf_conntrack_standalone_init_
{
struct proc_dir_entry *pde;
......
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