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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/drivers/net/ppp/pptp.c
..
..
@@ -24,6 +24,7 @@
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 #include <linux/in.h>
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 #include <linux/ip.h>
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 #include <linux/rcupdate.h>
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+#include <linux/security.h>
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 #include <linux/spinlock.h>
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 #include <net/sock.h>
..
..
@@ -128,6 +129,23 @@
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 	spin_unlock(&chan_lock);
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 }
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+static struct rtable *pptp_route_output(struct pppox_sock *po,
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+					struct flowi4 *fl4)
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+{
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+	struct sock *sk = &po->sk;
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+	struct net *net;
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+
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+	net = sock_net(sk);
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+	flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, 0,
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+			   RT_SCOPE_UNIVERSE, IPPROTO_GRE, 0,
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+			   po->proto.pptp.dst_addr.sin_addr.s_addr,
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+			   po->proto.pptp.src_addr.sin_addr.s_addr,
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+			   0, 0, sock_net_uid(net, sk));
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+	security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
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+
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+	return ip_route_output_flow(net, fl4, sk);
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+}
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+
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 static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
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 {
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 	struct sock *sk = (struct sock *) chan->private;
..
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@@ -151,11 +169,7 @@
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 	if (sk_pppox(po)->sk_state & PPPOX_DEAD)
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 		goto tx_error;
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-	rt = ip_route_output_ports(net, &fl4, NULL,
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-				   opt->dst_addr.sin_addr.s_addr,
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-				   opt->src_addr.sin_addr.s_addr,
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-				   0, 0, IPPROTO_GRE,
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-				   RT_TOS(0), sk->sk_bound_dev_if);
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+	rt = pptp_route_output(po, &fl4);
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 	if (IS_ERR(rt))
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 		goto tx_error;
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..
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@@ -440,12 +454,7 @@
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 	po->chan.private = sk;
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 	po->chan.ops = &pptp_chan_ops;
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456
 
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-	rt = ip_route_output_ports(sock_net(sk), &fl4, sk,
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-				   opt->dst_addr.sin_addr.s_addr,
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-				   opt->src_addr.sin_addr.s_addr,
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-				   0, 0,
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-				   IPPROTO_GRE, RT_CONN_FLAGS(sk),
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-				   sk->sk_bound_dev_if);
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+	rt = pptp_route_output(po, &fl4);
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 	if (IS_ERR(rt)) {
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 		error = -EHOSTUNREACH;
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 		goto end;