From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/net/l2tp/l2tp_ip.c | 63 ++++++++++---------------------
1 files changed, 21 insertions(+), 42 deletions(-)
diff --git a/kernel/net/l2tp/l2tp_ip.c b/kernel/net/l2tp/l2tp_ip.c
index 99881b8..97ae125 100644
--- a/kernel/net/l2tp/l2tp_ip.c
+++ b/kernel/net/l2tp/l2tp_ip.c
@@ -1,12 +1,7 @@
-/*
- * L2TPv3 IP encapsulation support
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* L2TPv3 IP encapsulation support
*
* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -123,14 +118,14 @@
struct l2tp_session *session;
struct l2tp_tunnel *tunnel = NULL;
struct iphdr *iph;
- int length;
if (!pskb_may_pull(skb, 4))
goto discard;
/* Point to L2TP header */
- optr = ptr = skb->data;
- session_id = ntohl(*((__be32 *) ptr));
+ optr = skb->data;
+ ptr = skb->data;
+ session_id = ntohl(*((__be32 *)ptr));
ptr += 4;
/* RFC3931: L2TP/IP packets have the first 4 bytes containing
@@ -151,19 +146,6 @@
if (!tunnel)
goto discard_sess;
- /* Trace packet contents, if enabled */
- if (tunnel->debug & L2TP_MSG_DATA) {
- length = min(32u, skb->len);
- if (!pskb_may_pull(skb, length))
- goto discard_sess;
-
- /* Point to L2TP header */
- optr = ptr = skb->data;
- ptr += 4;
- pr_debug("%s: ip recv\n", tunnel->name);
- print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
- }
-
if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr))
goto discard_sess;
@@ -180,7 +162,7 @@
if ((skb->data[0] & 0xc0) != 0xc0)
goto discard;
- tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
+ tunnel_id = ntohl(*(__be32 *)&skb->data[4]);
iph = (struct iphdr *)skb_network_header(skb);
read_lock_bh(&l2tp_ip_lock);
@@ -196,7 +178,7 @@
if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
goto discard_put;
- nf_reset(skb);
+ nf_reset_ct(skb);
return sk_receive_skb(sk, skb, 1);
@@ -251,8 +233,8 @@
static void l2tp_ip_destroy_sock(struct sock *sk)
{
+ struct l2tp_tunnel *tunnel = l2tp_sk_to_tunnel(sk);
struct sk_buff *skb;
- struct l2tp_tunnel *tunnel = sk->sk_user_data;
while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
kfree_skb(skb);
@@ -264,7 +246,7 @@
static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
struct inet_sock *inet = inet_sk(sk);
- struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
+ struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *)uaddr;
struct net *net = sock_net(sk);
int ret;
int chk_addr_ret;
@@ -289,8 +271,10 @@
chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
goto out;
- if (addr->l2tp_addr.s_addr)
- inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
+ if (addr->l2tp_addr.s_addr) {
+ inet->inet_rcv_saddr = addr->l2tp_addr.s_addr;
+ inet->inet_saddr = addr->l2tp_addr.s_addr;
+ }
if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
inet->inet_saddr = 0; /* Use device */
@@ -320,7 +304,7 @@
static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
- struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr;
+ struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr;
int rc;
if (addr_len < sizeof(*lsa))
@@ -379,6 +363,7 @@
lsa->l2tp_addr.s_addr = inet->inet_daddr;
} else {
__be32 addr = inet->inet_rcv_saddr;
+
if (!addr)
addr = inet->inet_saddr;
lsa->l2tp_conn_id = lsk->conn_id;
@@ -426,6 +411,7 @@
/* Get and verify the address. */
if (msg->msg_name) {
DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name);
+
rc = -EINVAL;
if (msg->msg_namelen < sizeof(*lip))
goto out;
@@ -460,7 +446,7 @@
skb_reset_transport_header(skb);
/* Insert 0 session_id */
- *((__be32 *) skb_put(skb, 4)) = 0;
+ *((__be32 *)skb_put(skb, 4)) = 0;
/* Copy user data into skb */
rc = memcpy_from_msg(skb_put(skb, len), msg, len);
@@ -471,10 +457,10 @@
fl4 = &inet->cork.fl.u.ip4;
if (connected)
- rt = (struct rtable *) __sk_dst_check(sk, 0);
+ rt = (struct rtable *)__sk_dst_check(sk, 0);
rcu_read_lock();
- if (rt == NULL) {
+ if (!rt) {
const struct ip_options_rcu *inet_opt;
inet_opt = rcu_dereference(inet->inet_opt);
@@ -596,7 +582,7 @@
return put_user(amount, (int __user *)arg);
}
-EXPORT_SYMBOL(l2tp_ioctl);
+EXPORT_SYMBOL_GPL(l2tp_ioctl);
static struct proto l2tp_ip_prot = {
.name = "L2TP/IP",
@@ -616,10 +602,6 @@
.hash = l2tp_ip_hash,
.unhash = l2tp_ip_unhash,
.obj_size = sizeof(struct l2tp_ip_sock),
-#ifdef CONFIG_COMPAT
- .compat_setsockopt = compat_ip_setsockopt,
- .compat_getsockopt = compat_ip_getsockopt,
-#endif
};
static const struct proto_ops l2tp_ip_ops = {
@@ -633,6 +615,7 @@
.getname = l2tp_ip_getname,
.poll = datagram_poll,
.ioctl = inet_ioctl,
+ .gettstamp = sock_gettstamp,
.listen = sock_no_listen,
.shutdown = inet_shutdown,
.setsockopt = sock_common_setsockopt,
@@ -641,10 +624,6 @@
.recvmsg = sock_common_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
-#ifdef CONFIG_COMPAT
- .compat_setsockopt = compat_sock_common_setsockopt,
- .compat_getsockopt = compat_sock_common_getsockopt,
-#endif
};
static struct inet_protosw l2tp_ip_protosw = {
--
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