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- 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>
- @@ -382,10 +383,66 @@ 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,
- };
- @@ -489,7 +546,7 @@ 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;
-
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