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89 lines
2.4 KiB
Diff
89 lines
2.4 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Subject: netfilter: add support for flushing conntrack via /proc
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lede-commit 8193bbe59a74d34d6a26d4a8cb857b1952905314
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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net/netfilter/nf_conntrack_standalone.c | 59 ++++++++++++++++++++++++++++++++-
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1 file changed, 58 insertions(+), 1 deletion(-)
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--- a/net/netfilter/nf_conntrack_standalone.c
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+++ b/net/netfilter/nf_conntrack_standalone.c
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@@ -9,6 +9,7 @@
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#include <linux/percpu.h>
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#include <linux/netdevice.h>
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#include <linux/security.h>
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+#include <linux/inet.h>
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#include <net/net_namespace.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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@@ -433,6 +434,56 @@ static int ct_cpu_seq_show(struct seq_fi
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return 0;
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}
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+struct kill_request {
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+ u16 family;
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+ union nf_inet_addr addr;
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+};
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+
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+static int kill_matching(struct nf_conn *i, void *data)
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+{
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+ struct kill_request *kr = data;
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+ struct nf_conntrack_tuple *t1 = &i->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
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+ struct nf_conntrack_tuple *t2 = &i->tuplehash[IP_CT_DIR_REPLY].tuple;
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+
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+ if (!kr->family)
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+ return 1;
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+
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+ if (t1->src.l3num != kr->family)
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+ return 0;
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+
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+ return (nf_inet_addr_cmp(&kr->addr, &t1->src.u3) ||
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+ nf_inet_addr_cmp(&kr->addr, &t1->dst.u3) ||
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+ nf_inet_addr_cmp(&kr->addr, &t2->src.u3) ||
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+ nf_inet_addr_cmp(&kr->addr, &t2->dst.u3));
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+}
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+
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+static int ct_file_write(struct file *file, char *buf, size_t count)
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+{
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+ struct seq_file *seq = file->private_data;
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+ struct net *net = seq_file_net(seq);
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+ struct kill_request kr = { };
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+
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+ if (count == 0)
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+ return 0;
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+
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+ if (count >= INET6_ADDRSTRLEN)
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+ count = INET6_ADDRSTRLEN - 1;
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+
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+ if (strnchr(buf, count, ':')) {
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+ kr.family = AF_INET6;
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+ if (!in6_pton(buf, count, (void *)&kr.addr, '\n', NULL))
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+ return -EINVAL;
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+ } else if (strnchr(buf, count, '.')) {
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+ kr.family = AF_INET;
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+ if (!in4_pton(buf, count, (void *)&kr.addr, '\n', NULL))
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+ return -EINVAL;
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+ }
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+
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+ nf_ct_iterate_cleanup_net(net, kill_matching, &kr, 0, 0);
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+
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+ return 0;
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+}
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+
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static const struct seq_operations ct_cpu_seq_ops = {
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.start = ct_cpu_seq_start,
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.next = ct_cpu_seq_next,
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@@ -446,8 +497,9 @@ static int nf_conntrack_standalone_init_
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kuid_t root_uid;
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kgid_t root_gid;
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- pde = proc_create_net("nf_conntrack", 0440, net->proc_net, &ct_seq_ops,
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- sizeof(struct ct_iter_state));
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+ pde = proc_create_net_data_write("nf_conntrack", 0440, net->proc_net,
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+ &ct_seq_ops, &ct_file_write,
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+ sizeof(struct ct_iter_state), NULL);
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if (!pde)
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goto out_nf_conntrack;
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