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![Zheng Yongjun](/assets/img/avatar_default.png)
Fix some spelling mistakes in comments: negociated ==> negotiated dont ==> don't Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1735 lines
42 KiB
C
1735 lines
42 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*****************************************************************************
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* Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets
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*
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* PPPoX --- Generic PPP encapsulation socket family
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* PPPoL2TP --- PPP over L2TP (RFC 2661)
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*
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* Version: 2.0.0
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*
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* Authors: James Chapman (jchapman@katalix.com)
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*
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* Based on original work by Martijn van Oosterhout <kleptog@svana.org>
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*
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* License:
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*/
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/* This driver handles only L2TP data frames; control frames are handled by a
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* userspace application.
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*
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* To send data in an L2TP session, userspace opens a PPPoL2TP socket and
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* attaches it to a bound UDP socket with local tunnel_id / session_id and
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* peer tunnel_id / session_id set. Data can then be sent or received using
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* regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket
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* can be read or modified using ioctl() or [gs]etsockopt() calls.
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*
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* When a PPPoL2TP socket is connected with local and peer session_id values
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* zero, the socket is treated as a special tunnel management socket.
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*
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* Here's example userspace code to create a socket for sending/receiving data
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* over an L2TP session:-
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*
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* struct sockaddr_pppol2tp sax;
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* int fd;
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* int session_fd;
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*
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* fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
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*
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* sax.sa_family = AF_PPPOX;
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* sax.sa_protocol = PX_PROTO_OL2TP;
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* sax.pppol2tp.fd = tunnel_fd; // bound UDP socket
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* sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr;
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* sax.pppol2tp.addr.sin_port = addr->sin_port;
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* sax.pppol2tp.addr.sin_family = AF_INET;
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* sax.pppol2tp.s_tunnel = tunnel_id;
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* sax.pppol2tp.s_session = session_id;
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* sax.pppol2tp.d_tunnel = peer_tunnel_id;
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* sax.pppol2tp.d_session = peer_session_id;
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*
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* session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax));
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*
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* A pppd plugin that allows PPP traffic to be carried over L2TP using
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* this driver is available from the OpenL2TP project at
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* http://openl2tp.sourceforge.net.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/kthread.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/jiffies.h>
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#include <linux/netdevice.h>
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#include <linux/net.h>
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#include <linux/inetdevice.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/if_pppox.h>
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#include <linux/if_pppol2tp.h>
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#include <net/sock.h>
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#include <linux/ppp_channel.h>
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#include <linux/ppp_defs.h>
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#include <linux/ppp-ioctl.h>
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#include <linux/file.h>
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#include <linux/hash.h>
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#include <linux/sort.h>
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#include <linux/proc_fs.h>
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#include <linux/l2tp.h>
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#include <linux/nsproxy.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/ip.h>
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#include <net/udp.h>
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#include <net/inet_common.h>
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#include <asm/byteorder.h>
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#include <linux/atomic.h>
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#include "l2tp_core.h"
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#define PPPOL2TP_DRV_VERSION "V2.0"
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/* Space for UDP, L2TP and PPP headers */
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#define PPPOL2TP_HEADER_OVERHEAD 40
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/* Number of bytes to build transmit L2TP headers.
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* Unfortunately the size is different depending on whether sequence numbers
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* are enabled.
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*/
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#define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
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#define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
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/* Private data of each session. This data lives at the end of struct
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* l2tp_session, referenced via session->priv[].
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*/
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struct pppol2tp_session {
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int owner; /* pid that opened the socket */
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struct mutex sk_lock; /* Protects .sk */
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struct sock __rcu *sk; /* Pointer to the session PPPoX socket */
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struct sock *__sk; /* Copy of .sk, for cleanup */
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struct rcu_head rcu; /* For asynchronous release */
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};
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static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
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static const struct ppp_channel_ops pppol2tp_chan_ops = {
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.start_xmit = pppol2tp_xmit,
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};
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static const struct proto_ops pppol2tp_ops;
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/* Retrieves the pppol2tp socket associated to a session.
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* A reference is held on the returned socket, so this function must be paired
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* with sock_put().
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*/
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static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session)
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{
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struct pppol2tp_session *ps = l2tp_session_priv(session);
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struct sock *sk;
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rcu_read_lock();
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sk = rcu_dereference(ps->sk);
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if (sk)
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sock_hold(sk);
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rcu_read_unlock();
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return sk;
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}
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/* Helpers to obtain tunnel/session contexts from sockets.
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*/
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static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
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{
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struct l2tp_session *session;
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if (!sk)
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return NULL;
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sock_hold(sk);
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session = (struct l2tp_session *)(sk->sk_user_data);
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if (!session) {
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sock_put(sk);
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goto out;
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}
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if (WARN_ON(session->magic != L2TP_SESSION_MAGIC)) {
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session = NULL;
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sock_put(sk);
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goto out;
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}
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out:
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return session;
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}
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/*****************************************************************************
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* Receive data handling
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*****************************************************************************/
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/* Receive message. This is the recvmsg for the PPPoL2TP socket.
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*/
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static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
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size_t len, int flags)
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{
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int err;
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struct sk_buff *skb;
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struct sock *sk = sock->sk;
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err = -EIO;
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if (sk->sk_state & PPPOX_BOUND)
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goto end;
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err = 0;
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skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
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flags & MSG_DONTWAIT, &err);
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if (!skb)
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goto end;
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if (len > skb->len)
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len = skb->len;
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else if (len < skb->len)
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msg->msg_flags |= MSG_TRUNC;
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err = skb_copy_datagram_msg(skb, 0, msg, len);
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if (likely(err == 0))
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err = len;
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kfree_skb(skb);
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end:
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return err;
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}
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static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
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{
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struct pppol2tp_session *ps = l2tp_session_priv(session);
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struct sock *sk = NULL;
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/* If the socket is bound, send it in to PPP's input queue. Otherwise
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* queue it on the session socket.
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*/
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rcu_read_lock();
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sk = rcu_dereference(ps->sk);
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if (!sk)
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goto no_sock;
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/* If the first two bytes are 0xFF03, consider that it is the PPP's
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* Address and Control fields and skip them. The L2TP module has always
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* worked this way, although, in theory, the use of these fields should
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* be negotiated and handled at the PPP layer. These fields are
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* constant: 0xFF is the All-Stations Address and 0x03 the Unnumbered
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* Information command with Poll/Final bit set to zero (RFC 1662).
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*/
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if (pskb_may_pull(skb, 2) && skb->data[0] == PPP_ALLSTATIONS &&
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skb->data[1] == PPP_UI)
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skb_pull(skb, 2);
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if (sk->sk_state & PPPOX_BOUND) {
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struct pppox_sock *po;
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po = pppox_sk(sk);
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ppp_input(&po->chan, skb);
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} else {
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if (sock_queue_rcv_skb(sk, skb) < 0) {
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atomic_long_inc(&session->stats.rx_errors);
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kfree_skb(skb);
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}
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}
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rcu_read_unlock();
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return;
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no_sock:
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rcu_read_unlock();
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pr_warn_ratelimited("%s: no socket in recv\n", session->name);
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kfree_skb(skb);
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}
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/************************************************************************
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* Transmit handling
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***********************************************************************/
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/* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
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* when a user application does a sendmsg() on the session socket. L2TP and
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* PPP headers must be inserted into the user's data.
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*/
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static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
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size_t total_len)
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{
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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int error;
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struct l2tp_session *session;
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struct l2tp_tunnel *tunnel;
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int uhlen;
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error = -ENOTCONN;
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if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
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goto error;
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/* Get session and tunnel contexts */
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error = -EBADF;
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session = pppol2tp_sock_to_session(sk);
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if (!session)
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goto error;
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tunnel = session->tunnel;
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uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
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/* Allocate a socket buffer */
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error = -ENOMEM;
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skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
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uhlen + session->hdr_len +
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2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
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0, GFP_KERNEL);
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if (!skb)
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goto error_put_sess;
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/* Reserve space for headers. */
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skb_reserve(skb, NET_SKB_PAD);
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skb_reset_network_header(skb);
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skb_reserve(skb, sizeof(struct iphdr));
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skb_reset_transport_header(skb);
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skb_reserve(skb, uhlen);
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/* Add PPP header */
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skb->data[0] = PPP_ALLSTATIONS;
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skb->data[1] = PPP_UI;
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skb_put(skb, 2);
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/* Copy user data into skb */
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error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
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if (error < 0) {
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kfree_skb(skb);
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goto error_put_sess;
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}
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local_bh_disable();
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l2tp_xmit_skb(session, skb);
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local_bh_enable();
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sock_put(sk);
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return total_len;
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error_put_sess:
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sock_put(sk);
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error:
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return error;
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}
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/* Transmit function called by generic PPP driver. Sends PPP frame
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* over PPPoL2TP socket.
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*
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* This is almost the same as pppol2tp_sendmsg(), but rather than
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* being called with a msghdr from userspace, it is called with a skb
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* from the kernel.
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*
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* The supplied skb from ppp doesn't have enough headroom for the
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* insertion of L2TP, UDP and IP headers so we need to allocate more
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* headroom in the skb. This will create a cloned skb. But we must be
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* careful in the error case because the caller will expect to free
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* the skb it supplied, not our cloned skb. So we take care to always
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* leave the original skb unfreed if we return an error.
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*/
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static int pppol2tp_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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struct l2tp_session *session;
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struct l2tp_tunnel *tunnel;
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int uhlen, headroom;
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|
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if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
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goto abort;
|
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|
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/* Get session and tunnel contexts from the socket */
|
|
session = pppol2tp_sock_to_session(sk);
|
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if (!session)
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goto abort;
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|
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tunnel = session->tunnel;
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|
|
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uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
|
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headroom = NET_SKB_PAD +
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sizeof(struct iphdr) + /* IP header */
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uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
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session->hdr_len + /* L2TP header */
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2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
|
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if (skb_cow_head(skb, headroom))
|
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goto abort_put_sess;
|
|
|
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/* Setup PPP header */
|
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__skb_push(skb, 2);
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skb->data[0] = PPP_ALLSTATIONS;
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skb->data[1] = PPP_UI;
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|
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local_bh_disable();
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l2tp_xmit_skb(session, skb);
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local_bh_enable();
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|
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sock_put(sk);
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|
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return 1;
|
|
|
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abort_put_sess:
|
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sock_put(sk);
|
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abort:
|
|
/* Free the original skb */
|
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kfree_skb(skb);
|
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return 1;
|
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}
|
|
|
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/*****************************************************************************
|
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* Session (and tunnel control) socket create/destroy.
|
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*****************************************************************************/
|
|
|
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static void pppol2tp_put_sk(struct rcu_head *head)
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{
|
|
struct pppol2tp_session *ps;
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|
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ps = container_of(head, typeof(*ps), rcu);
|
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sock_put(ps->__sk);
|
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}
|
|
|
|
/* Really kill the session socket. (Called from sock_put() if
|
|
* refcnt == 0.)
|
|
*/
|
|
static void pppol2tp_session_destruct(struct sock *sk)
|
|
{
|
|
struct l2tp_session *session = sk->sk_user_data;
|
|
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
skb_queue_purge(&sk->sk_write_queue);
|
|
|
|
if (session) {
|
|
sk->sk_user_data = NULL;
|
|
if (WARN_ON(session->magic != L2TP_SESSION_MAGIC))
|
|
return;
|
|
l2tp_session_dec_refcount(session);
|
|
}
|
|
}
|
|
|
|
/* Called when the PPPoX socket (session) is closed.
|
|
*/
|
|
static int pppol2tp_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2tp_session *session;
|
|
int error;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
error = -EBADF;
|
|
lock_sock(sk);
|
|
if (sock_flag(sk, SOCK_DEAD) != 0)
|
|
goto error;
|
|
|
|
pppox_unbind_sock(sk);
|
|
|
|
/* Signal the death of the socket. */
|
|
sk->sk_state = PPPOX_DEAD;
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
|
|
session = pppol2tp_sock_to_session(sk);
|
|
if (session) {
|
|
struct pppol2tp_session *ps;
|
|
|
|
l2tp_session_delete(session);
|
|
|
|
ps = l2tp_session_priv(session);
|
|
mutex_lock(&ps->sk_lock);
|
|
ps->__sk = rcu_dereference_protected(ps->sk,
|
|
lockdep_is_held(&ps->sk_lock));
|
|
RCU_INIT_POINTER(ps->sk, NULL);
|
|
mutex_unlock(&ps->sk_lock);
|
|
call_rcu(&ps->rcu, pppol2tp_put_sk);
|
|
|
|
/* Rely on the sock_put() call at the end of the function for
|
|
* dropping the reference held by pppol2tp_sock_to_session().
|
|
* The last reference will be dropped by pppol2tp_put_sk().
|
|
*/
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
/* This will delete the session context via
|
|
* pppol2tp_session_destruct() if the socket's refcnt drops to
|
|
* zero.
|
|
*/
|
|
sock_put(sk);
|
|
|
|
return 0;
|
|
|
|
error:
|
|
release_sock(sk);
|
|
return error;
|
|
}
|
|
|
|
static struct proto pppol2tp_sk_proto = {
|
|
.name = "PPPOL2TP",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct pppox_sock),
|
|
};
|
|
|
|
static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
int rc;
|
|
|
|
rc = l2tp_udp_encap_recv(sk, skb);
|
|
if (rc)
|
|
kfree_skb(skb);
|
|
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
/* socket() handler. Initialize a new struct sock.
|
|
*/
|
|
static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
|
|
{
|
|
int error = -ENOMEM;
|
|
struct sock *sk;
|
|
|
|
sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
|
|
if (!sk)
|
|
goto out;
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
sock->ops = &pppol2tp_ops;
|
|
|
|
sk->sk_backlog_rcv = pppol2tp_backlog_recv;
|
|
sk->sk_protocol = PX_PROTO_OL2TP;
|
|
sk->sk_family = PF_PPPOX;
|
|
sk->sk_state = PPPOX_NONE;
|
|
sk->sk_type = SOCK_STREAM;
|
|
sk->sk_destruct = pppol2tp_session_destruct;
|
|
|
|
error = 0;
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static void pppol2tp_show(struct seq_file *m, void *arg)
|
|
{
|
|
struct l2tp_session *session = arg;
|
|
struct sock *sk;
|
|
|
|
sk = pppol2tp_session_get_sock(session);
|
|
if (sk) {
|
|
struct pppox_sock *po = pppox_sk(sk);
|
|
|
|
seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
|
|
sock_put(sk);
|
|
}
|
|
}
|
|
|
|
static void pppol2tp_session_init(struct l2tp_session *session)
|
|
{
|
|
struct pppol2tp_session *ps;
|
|
|
|
session->recv_skb = pppol2tp_recv;
|
|
if (IS_ENABLED(CONFIG_L2TP_DEBUGFS))
|
|
session->show = pppol2tp_show;
|
|
|
|
ps = l2tp_session_priv(session);
|
|
mutex_init(&ps->sk_lock);
|
|
ps->owner = current->pid;
|
|
}
|
|
|
|
struct l2tp_connect_info {
|
|
u8 version;
|
|
int fd;
|
|
u32 tunnel_id;
|
|
u32 peer_tunnel_id;
|
|
u32 session_id;
|
|
u32 peer_session_id;
|
|
};
|
|
|
|
static int pppol2tp_sockaddr_get_info(const void *sa, int sa_len,
|
|
struct l2tp_connect_info *info)
|
|
{
|
|
switch (sa_len) {
|
|
case sizeof(struct sockaddr_pppol2tp):
|
|
{
|
|
const struct sockaddr_pppol2tp *sa_v2in4 = sa;
|
|
|
|
if (sa_v2in4->sa_protocol != PX_PROTO_OL2TP)
|
|
return -EINVAL;
|
|
|
|
info->version = 2;
|
|
info->fd = sa_v2in4->pppol2tp.fd;
|
|
info->tunnel_id = sa_v2in4->pppol2tp.s_tunnel;
|
|
info->peer_tunnel_id = sa_v2in4->pppol2tp.d_tunnel;
|
|
info->session_id = sa_v2in4->pppol2tp.s_session;
|
|
info->peer_session_id = sa_v2in4->pppol2tp.d_session;
|
|
|
|
break;
|
|
}
|
|
case sizeof(struct sockaddr_pppol2tpv3):
|
|
{
|
|
const struct sockaddr_pppol2tpv3 *sa_v3in4 = sa;
|
|
|
|
if (sa_v3in4->sa_protocol != PX_PROTO_OL2TP)
|
|
return -EINVAL;
|
|
|
|
info->version = 3;
|
|
info->fd = sa_v3in4->pppol2tp.fd;
|
|
info->tunnel_id = sa_v3in4->pppol2tp.s_tunnel;
|
|
info->peer_tunnel_id = sa_v3in4->pppol2tp.d_tunnel;
|
|
info->session_id = sa_v3in4->pppol2tp.s_session;
|
|
info->peer_session_id = sa_v3in4->pppol2tp.d_session;
|
|
|
|
break;
|
|
}
|
|
case sizeof(struct sockaddr_pppol2tpin6):
|
|
{
|
|
const struct sockaddr_pppol2tpin6 *sa_v2in6 = sa;
|
|
|
|
if (sa_v2in6->sa_protocol != PX_PROTO_OL2TP)
|
|
return -EINVAL;
|
|
|
|
info->version = 2;
|
|
info->fd = sa_v2in6->pppol2tp.fd;
|
|
info->tunnel_id = sa_v2in6->pppol2tp.s_tunnel;
|
|
info->peer_tunnel_id = sa_v2in6->pppol2tp.d_tunnel;
|
|
info->session_id = sa_v2in6->pppol2tp.s_session;
|
|
info->peer_session_id = sa_v2in6->pppol2tp.d_session;
|
|
|
|
break;
|
|
}
|
|
case sizeof(struct sockaddr_pppol2tpv3in6):
|
|
{
|
|
const struct sockaddr_pppol2tpv3in6 *sa_v3in6 = sa;
|
|
|
|
if (sa_v3in6->sa_protocol != PX_PROTO_OL2TP)
|
|
return -EINVAL;
|
|
|
|
info->version = 3;
|
|
info->fd = sa_v3in6->pppol2tp.fd;
|
|
info->tunnel_id = sa_v3in6->pppol2tp.s_tunnel;
|
|
info->peer_tunnel_id = sa_v3in6->pppol2tp.d_tunnel;
|
|
info->session_id = sa_v3in6->pppol2tp.s_session;
|
|
info->peer_session_id = sa_v3in6->pppol2tp.d_session;
|
|
|
|
break;
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Rough estimation of the maximum payload size a tunnel can transmit without
|
|
* fragmenting at the lower IP layer. Assumes L2TPv2 with sequence
|
|
* numbers and no IP option. Not quite accurate, but the result is mostly
|
|
* unused anyway.
|
|
*/
|
|
static int pppol2tp_tunnel_mtu(const struct l2tp_tunnel *tunnel)
|
|
{
|
|
int mtu;
|
|
|
|
mtu = l2tp_tunnel_dst_mtu(tunnel);
|
|
if (mtu <= PPPOL2TP_HEADER_OVERHEAD)
|
|
return 1500 - PPPOL2TP_HEADER_OVERHEAD;
|
|
|
|
return mtu - PPPOL2TP_HEADER_OVERHEAD;
|
|
}
|
|
|
|
/* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
|
|
*/
|
|
static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
|
|
int sockaddr_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct pppox_sock *po = pppox_sk(sk);
|
|
struct l2tp_session *session = NULL;
|
|
struct l2tp_connect_info info;
|
|
struct l2tp_tunnel *tunnel;
|
|
struct pppol2tp_session *ps;
|
|
struct l2tp_session_cfg cfg = { 0, };
|
|
bool drop_refcnt = false;
|
|
bool drop_tunnel = false;
|
|
bool new_session = false;
|
|
bool new_tunnel = false;
|
|
int error;
|
|
|
|
error = pppol2tp_sockaddr_get_info(uservaddr, sockaddr_len, &info);
|
|
if (error < 0)
|
|
return error;
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Check for already bound sockets */
|
|
error = -EBUSY;
|
|
if (sk->sk_state & PPPOX_CONNECTED)
|
|
goto end;
|
|
|
|
/* We don't supporting rebinding anyway */
|
|
error = -EALREADY;
|
|
if (sk->sk_user_data)
|
|
goto end; /* socket is already attached */
|
|
|
|
/* Don't bind if tunnel_id is 0 */
|
|
error = -EINVAL;
|
|
if (!info.tunnel_id)
|
|
goto end;
|
|
|
|
tunnel = l2tp_tunnel_get(sock_net(sk), info.tunnel_id);
|
|
if (tunnel)
|
|
drop_tunnel = true;
|
|
|
|
/* Special case: create tunnel context if session_id and
|
|
* peer_session_id is 0. Otherwise look up tunnel using supplied
|
|
* tunnel id.
|
|
*/
|
|
if (!info.session_id && !info.peer_session_id) {
|
|
if (!tunnel) {
|
|
struct l2tp_tunnel_cfg tcfg = {
|
|
.encap = L2TP_ENCAPTYPE_UDP,
|
|
};
|
|
|
|
/* Prevent l2tp_tunnel_register() from trying to set up
|
|
* a kernel socket.
|
|
*/
|
|
if (info.fd < 0) {
|
|
error = -EBADF;
|
|
goto end;
|
|
}
|
|
|
|
error = l2tp_tunnel_create(info.fd,
|
|
info.version,
|
|
info.tunnel_id,
|
|
info.peer_tunnel_id, &tcfg,
|
|
&tunnel);
|
|
if (error < 0)
|
|
goto end;
|
|
|
|
l2tp_tunnel_inc_refcount(tunnel);
|
|
error = l2tp_tunnel_register(tunnel, sock_net(sk),
|
|
&tcfg);
|
|
if (error < 0) {
|
|
kfree(tunnel);
|
|
goto end;
|
|
}
|
|
drop_tunnel = true;
|
|
new_tunnel = true;
|
|
}
|
|
} else {
|
|
/* Error if we can't find the tunnel */
|
|
error = -ENOENT;
|
|
if (!tunnel)
|
|
goto end;
|
|
|
|
/* Error if socket is not prepped */
|
|
if (!tunnel->sock)
|
|
goto end;
|
|
}
|
|
|
|
if (tunnel->peer_tunnel_id == 0)
|
|
tunnel->peer_tunnel_id = info.peer_tunnel_id;
|
|
|
|
session = l2tp_tunnel_get_session(tunnel, info.session_id);
|
|
if (session) {
|
|
drop_refcnt = true;
|
|
|
|
if (session->pwtype != L2TP_PWTYPE_PPP) {
|
|
error = -EPROTOTYPE;
|
|
goto end;
|
|
}
|
|
|
|
ps = l2tp_session_priv(session);
|
|
|
|
/* Using a pre-existing session is fine as long as it hasn't
|
|
* been connected yet.
|
|
*/
|
|
mutex_lock(&ps->sk_lock);
|
|
if (rcu_dereference_protected(ps->sk,
|
|
lockdep_is_held(&ps->sk_lock)) ||
|
|
ps->__sk) {
|
|
mutex_unlock(&ps->sk_lock);
|
|
error = -EEXIST;
|
|
goto end;
|
|
}
|
|
} else {
|
|
cfg.pw_type = L2TP_PWTYPE_PPP;
|
|
|
|
session = l2tp_session_create(sizeof(struct pppol2tp_session),
|
|
tunnel, info.session_id,
|
|
info.peer_session_id, &cfg);
|
|
if (IS_ERR(session)) {
|
|
error = PTR_ERR(session);
|
|
goto end;
|
|
}
|
|
|
|
pppol2tp_session_init(session);
|
|
ps = l2tp_session_priv(session);
|
|
l2tp_session_inc_refcount(session);
|
|
|
|
mutex_lock(&ps->sk_lock);
|
|
error = l2tp_session_register(session, tunnel);
|
|
if (error < 0) {
|
|
mutex_unlock(&ps->sk_lock);
|
|
kfree(session);
|
|
goto end;
|
|
}
|
|
drop_refcnt = true;
|
|
new_session = true;
|
|
}
|
|
|
|
/* Special case: if source & dest session_id == 0x0000, this
|
|
* socket is being created to manage the tunnel. Just set up
|
|
* the internal context for use by ioctl() and sockopt()
|
|
* handlers.
|
|
*/
|
|
if (session->session_id == 0 && session->peer_session_id == 0) {
|
|
error = 0;
|
|
goto out_no_ppp;
|
|
}
|
|
|
|
/* The only header we need to worry about is the L2TP
|
|
* header. This size is different depending on whether
|
|
* sequence numbers are enabled for the data channel.
|
|
*/
|
|
po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
|
|
|
|
po->chan.private = sk;
|
|
po->chan.ops = &pppol2tp_chan_ops;
|
|
po->chan.mtu = pppol2tp_tunnel_mtu(tunnel);
|
|
|
|
error = ppp_register_net_channel(sock_net(sk), &po->chan);
|
|
if (error) {
|
|
mutex_unlock(&ps->sk_lock);
|
|
goto end;
|
|
}
|
|
|
|
out_no_ppp:
|
|
/* This is how we get the session context from the socket. */
|
|
sk->sk_user_data = session;
|
|
rcu_assign_pointer(ps->sk, sk);
|
|
mutex_unlock(&ps->sk_lock);
|
|
|
|
/* Keep the reference we've grabbed on the session: sk doesn't expect
|
|
* the session to disappear. pppol2tp_session_destruct() is responsible
|
|
* for dropping it.
|
|
*/
|
|
drop_refcnt = false;
|
|
|
|
sk->sk_state = PPPOX_CONNECTED;
|
|
|
|
end:
|
|
if (error) {
|
|
if (new_session)
|
|
l2tp_session_delete(session);
|
|
if (new_tunnel)
|
|
l2tp_tunnel_delete(tunnel);
|
|
}
|
|
if (drop_refcnt)
|
|
l2tp_session_dec_refcount(session);
|
|
if (drop_tunnel)
|
|
l2tp_tunnel_dec_refcount(tunnel);
|
|
release_sock(sk);
|
|
|
|
return error;
|
|
}
|
|
|
|
#ifdef CONFIG_L2TP_V3
|
|
|
|
/* Called when creating sessions via the netlink interface. */
|
|
static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
|
|
u32 session_id, u32 peer_session_id,
|
|
struct l2tp_session_cfg *cfg)
|
|
{
|
|
int error;
|
|
struct l2tp_session *session;
|
|
|
|
/* Error if tunnel socket is not prepped */
|
|
if (!tunnel->sock) {
|
|
error = -ENOENT;
|
|
goto err;
|
|
}
|
|
|
|
/* Allocate and initialize a new session context. */
|
|
session = l2tp_session_create(sizeof(struct pppol2tp_session),
|
|
tunnel, session_id,
|
|
peer_session_id, cfg);
|
|
if (IS_ERR(session)) {
|
|
error = PTR_ERR(session);
|
|
goto err;
|
|
}
|
|
|
|
pppol2tp_session_init(session);
|
|
|
|
error = l2tp_session_register(session, tunnel);
|
|
if (error < 0)
|
|
goto err_sess;
|
|
|
|
return 0;
|
|
|
|
err_sess:
|
|
kfree(session);
|
|
err:
|
|
return error;
|
|
}
|
|
|
|
#endif /* CONFIG_L2TP_V3 */
|
|
|
|
/* getname() support.
|
|
*/
|
|
static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int peer)
|
|
{
|
|
int len = 0;
|
|
int error = 0;
|
|
struct l2tp_session *session;
|
|
struct l2tp_tunnel *tunnel;
|
|
struct sock *sk = sock->sk;
|
|
struct inet_sock *inet;
|
|
struct pppol2tp_session *pls;
|
|
|
|
error = -ENOTCONN;
|
|
if (!sk)
|
|
goto end;
|
|
if (!(sk->sk_state & PPPOX_CONNECTED))
|
|
goto end;
|
|
|
|
error = -EBADF;
|
|
session = pppol2tp_sock_to_session(sk);
|
|
if (!session)
|
|
goto end;
|
|
|
|
pls = l2tp_session_priv(session);
|
|
tunnel = session->tunnel;
|
|
|
|
inet = inet_sk(tunnel->sock);
|
|
if (tunnel->version == 2 && tunnel->sock->sk_family == AF_INET) {
|
|
struct sockaddr_pppol2tp sp;
|
|
|
|
len = sizeof(sp);
|
|
memset(&sp, 0, len);
|
|
sp.sa_family = AF_PPPOX;
|
|
sp.sa_protocol = PX_PROTO_OL2TP;
|
|
sp.pppol2tp.fd = tunnel->fd;
|
|
sp.pppol2tp.pid = pls->owner;
|
|
sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
|
|
sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
|
|
sp.pppol2tp.s_session = session->session_id;
|
|
sp.pppol2tp.d_session = session->peer_session_id;
|
|
sp.pppol2tp.addr.sin_family = AF_INET;
|
|
sp.pppol2tp.addr.sin_port = inet->inet_dport;
|
|
sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
|
|
memcpy(uaddr, &sp, len);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else if (tunnel->version == 2 && tunnel->sock->sk_family == AF_INET6) {
|
|
struct sockaddr_pppol2tpin6 sp;
|
|
|
|
len = sizeof(sp);
|
|
memset(&sp, 0, len);
|
|
sp.sa_family = AF_PPPOX;
|
|
sp.sa_protocol = PX_PROTO_OL2TP;
|
|
sp.pppol2tp.fd = tunnel->fd;
|
|
sp.pppol2tp.pid = pls->owner;
|
|
sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
|
|
sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
|
|
sp.pppol2tp.s_session = session->session_id;
|
|
sp.pppol2tp.d_session = session->peer_session_id;
|
|
sp.pppol2tp.addr.sin6_family = AF_INET6;
|
|
sp.pppol2tp.addr.sin6_port = inet->inet_dport;
|
|
memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
|
|
sizeof(tunnel->sock->sk_v6_daddr));
|
|
memcpy(uaddr, &sp, len);
|
|
} else if (tunnel->version == 3 && tunnel->sock->sk_family == AF_INET6) {
|
|
struct sockaddr_pppol2tpv3in6 sp;
|
|
|
|
len = sizeof(sp);
|
|
memset(&sp, 0, len);
|
|
sp.sa_family = AF_PPPOX;
|
|
sp.sa_protocol = PX_PROTO_OL2TP;
|
|
sp.pppol2tp.fd = tunnel->fd;
|
|
sp.pppol2tp.pid = pls->owner;
|
|
sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
|
|
sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
|
|
sp.pppol2tp.s_session = session->session_id;
|
|
sp.pppol2tp.d_session = session->peer_session_id;
|
|
sp.pppol2tp.addr.sin6_family = AF_INET6;
|
|
sp.pppol2tp.addr.sin6_port = inet->inet_dport;
|
|
memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
|
|
sizeof(tunnel->sock->sk_v6_daddr));
|
|
memcpy(uaddr, &sp, len);
|
|
#endif
|
|
} else if (tunnel->version == 3) {
|
|
struct sockaddr_pppol2tpv3 sp;
|
|
|
|
len = sizeof(sp);
|
|
memset(&sp, 0, len);
|
|
sp.sa_family = AF_PPPOX;
|
|
sp.sa_protocol = PX_PROTO_OL2TP;
|
|
sp.pppol2tp.fd = tunnel->fd;
|
|
sp.pppol2tp.pid = pls->owner;
|
|
sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
|
|
sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
|
|
sp.pppol2tp.s_session = session->session_id;
|
|
sp.pppol2tp.d_session = session->peer_session_id;
|
|
sp.pppol2tp.addr.sin_family = AF_INET;
|
|
sp.pppol2tp.addr.sin_port = inet->inet_dport;
|
|
sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
|
|
memcpy(uaddr, &sp, len);
|
|
}
|
|
|
|
error = len;
|
|
|
|
sock_put(sk);
|
|
end:
|
|
return error;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* ioctl() handlers.
|
|
*
|
|
* The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
|
|
* sockets. However, in order to control kernel tunnel features, we allow
|
|
* userspace to create a special "tunnel" PPPoX socket which is used for
|
|
* control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
|
|
* the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
|
|
* calls.
|
|
****************************************************************************/
|
|
|
|
static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
|
|
const struct l2tp_stats *stats)
|
|
{
|
|
memset(dest, 0, sizeof(*dest));
|
|
|
|
dest->tx_packets = atomic_long_read(&stats->tx_packets);
|
|
dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
|
|
dest->tx_errors = atomic_long_read(&stats->tx_errors);
|
|
dest->rx_packets = atomic_long_read(&stats->rx_packets);
|
|
dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
|
|
dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
|
|
dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
|
|
dest->rx_errors = atomic_long_read(&stats->rx_errors);
|
|
}
|
|
|
|
static int pppol2tp_tunnel_copy_stats(struct pppol2tp_ioc_stats *stats,
|
|
struct l2tp_tunnel *tunnel)
|
|
{
|
|
struct l2tp_session *session;
|
|
|
|
if (!stats->session_id) {
|
|
pppol2tp_copy_stats(stats, &tunnel->stats);
|
|
return 0;
|
|
}
|
|
|
|
/* If session_id is set, search the corresponding session in the
|
|
* context of this tunnel and record the session's statistics.
|
|
*/
|
|
session = l2tp_tunnel_get_session(tunnel, stats->session_id);
|
|
if (!session)
|
|
return -EBADR;
|
|
|
|
if (session->pwtype != L2TP_PWTYPE_PPP) {
|
|
l2tp_session_dec_refcount(session);
|
|
return -EBADR;
|
|
}
|
|
|
|
pppol2tp_copy_stats(stats, &session->stats);
|
|
l2tp_session_dec_refcount(session);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct pppol2tp_ioc_stats stats;
|
|
struct l2tp_session *session;
|
|
|
|
switch (cmd) {
|
|
case PPPIOCGMRU:
|
|
case PPPIOCGFLAGS:
|
|
session = sock->sk->sk_user_data;
|
|
if (!session)
|
|
return -ENOTCONN;
|
|
|
|
if (WARN_ON(session->magic != L2TP_SESSION_MAGIC))
|
|
return -EBADF;
|
|
|
|
/* Not defined for tunnels */
|
|
if (!session->session_id && !session->peer_session_id)
|
|
return -ENOSYS;
|
|
|
|
if (put_user(0, (int __user *)arg))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case PPPIOCSMRU:
|
|
case PPPIOCSFLAGS:
|
|
session = sock->sk->sk_user_data;
|
|
if (!session)
|
|
return -ENOTCONN;
|
|
|
|
if (WARN_ON(session->magic != L2TP_SESSION_MAGIC))
|
|
return -EBADF;
|
|
|
|
/* Not defined for tunnels */
|
|
if (!session->session_id && !session->peer_session_id)
|
|
return -ENOSYS;
|
|
|
|
if (!access_ok((int __user *)arg, sizeof(int)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case PPPIOCGL2TPSTATS:
|
|
session = sock->sk->sk_user_data;
|
|
if (!session)
|
|
return -ENOTCONN;
|
|
|
|
if (WARN_ON(session->magic != L2TP_SESSION_MAGIC))
|
|
return -EBADF;
|
|
|
|
/* Session 0 represents the parent tunnel */
|
|
if (!session->session_id && !session->peer_session_id) {
|
|
u32 session_id;
|
|
int err;
|
|
|
|
if (copy_from_user(&stats, (void __user *)arg,
|
|
sizeof(stats)))
|
|
return -EFAULT;
|
|
|
|
session_id = stats.session_id;
|
|
err = pppol2tp_tunnel_copy_stats(&stats,
|
|
session->tunnel);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
stats.session_id = session_id;
|
|
} else {
|
|
pppol2tp_copy_stats(&stats, &session->stats);
|
|
stats.session_id = session->session_id;
|
|
}
|
|
stats.tunnel_id = session->tunnel->tunnel_id;
|
|
stats.using_ipsec = l2tp_tunnel_uses_xfrm(session->tunnel);
|
|
|
|
if (copy_to_user((void __user *)arg, &stats, sizeof(stats)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* setsockopt() / getsockopt() support.
|
|
*
|
|
* The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
|
|
* sockets. In order to control kernel tunnel features, we allow userspace to
|
|
* create a special "tunnel" PPPoX socket which is used for control only.
|
|
* Tunnel PPPoX sockets have session_id == 0 and simply allow the user
|
|
* application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
|
|
*****************************************************************************/
|
|
|
|
/* Tunnel setsockopt() helper.
|
|
*/
|
|
static int pppol2tp_tunnel_setsockopt(struct sock *sk,
|
|
struct l2tp_tunnel *tunnel,
|
|
int optname, int val)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (optname) {
|
|
case PPPOL2TP_SO_DEBUG:
|
|
/* Tunnel debug flags option is deprecated */
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Session setsockopt helper.
|
|
*/
|
|
static int pppol2tp_session_setsockopt(struct sock *sk,
|
|
struct l2tp_session *session,
|
|
int optname, int val)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (optname) {
|
|
case PPPOL2TP_SO_RECVSEQ:
|
|
if (val != 0 && val != 1) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
session->recv_seq = !!val;
|
|
break;
|
|
|
|
case PPPOL2TP_SO_SENDSEQ:
|
|
if (val != 0 && val != 1) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
session->send_seq = !!val;
|
|
{
|
|
struct pppox_sock *po = pppox_sk(sk);
|
|
|
|
po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
|
|
PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
|
|
}
|
|
l2tp_session_set_header_len(session, session->tunnel->version);
|
|
break;
|
|
|
|
case PPPOL2TP_SO_LNSMODE:
|
|
if (val != 0 && val != 1) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
session->lns_mode = !!val;
|
|
break;
|
|
|
|
case PPPOL2TP_SO_DEBUG:
|
|
/* Session debug flags option is deprecated */
|
|
break;
|
|
|
|
case PPPOL2TP_SO_REORDERTO:
|
|
session->reorder_timeout = msecs_to_jiffies(val);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Main setsockopt() entry point.
|
|
* Does API checks, then calls either the tunnel or session setsockopt
|
|
* handler, according to whether the PPPoL2TP socket is a for a regular
|
|
* session or the special tunnel type.
|
|
*/
|
|
static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2tp_session *session;
|
|
struct l2tp_tunnel *tunnel;
|
|
int val;
|
|
int err;
|
|
|
|
if (level != SOL_PPPOL2TP)
|
|
return -EINVAL;
|
|
|
|
if (optlen < sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&val, optval, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
err = -ENOTCONN;
|
|
if (!sk->sk_user_data)
|
|
goto end;
|
|
|
|
/* Get session context from the socket */
|
|
err = -EBADF;
|
|
session = pppol2tp_sock_to_session(sk);
|
|
if (!session)
|
|
goto end;
|
|
|
|
/* Special case: if session_id == 0x0000, treat as operation on tunnel
|
|
*/
|
|
if (session->session_id == 0 && session->peer_session_id == 0) {
|
|
tunnel = session->tunnel;
|
|
err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
|
|
} else {
|
|
err = pppol2tp_session_setsockopt(sk, session, optname, val);
|
|
}
|
|
|
|
sock_put(sk);
|
|
end:
|
|
return err;
|
|
}
|
|
|
|
/* Tunnel getsockopt helper. Called with sock locked.
|
|
*/
|
|
static int pppol2tp_tunnel_getsockopt(struct sock *sk,
|
|
struct l2tp_tunnel *tunnel,
|
|
int optname, int *val)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (optname) {
|
|
case PPPOL2TP_SO_DEBUG:
|
|
/* Tunnel debug flags option is deprecated */
|
|
*val = 0;
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Session getsockopt helper. Called with sock locked.
|
|
*/
|
|
static int pppol2tp_session_getsockopt(struct sock *sk,
|
|
struct l2tp_session *session,
|
|
int optname, int *val)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (optname) {
|
|
case PPPOL2TP_SO_RECVSEQ:
|
|
*val = session->recv_seq;
|
|
break;
|
|
|
|
case PPPOL2TP_SO_SENDSEQ:
|
|
*val = session->send_seq;
|
|
break;
|
|
|
|
case PPPOL2TP_SO_LNSMODE:
|
|
*val = session->lns_mode;
|
|
break;
|
|
|
|
case PPPOL2TP_SO_DEBUG:
|
|
/* Session debug flags option is deprecated */
|
|
*val = 0;
|
|
break;
|
|
|
|
case PPPOL2TP_SO_REORDERTO:
|
|
*val = (int)jiffies_to_msecs(session->reorder_timeout);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Main getsockopt() entry point.
|
|
* Does API checks, then calls either the tunnel or session getsockopt
|
|
* handler, according to whether the PPPoX socket is a for a regular session
|
|
* or the special tunnel type.
|
|
*/
|
|
static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2tp_session *session;
|
|
struct l2tp_tunnel *tunnel;
|
|
int val, len;
|
|
int err;
|
|
|
|
if (level != SOL_PPPOL2TP)
|
|
return -EINVAL;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
len = min_t(unsigned int, len, sizeof(int));
|
|
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
err = -ENOTCONN;
|
|
if (!sk->sk_user_data)
|
|
goto end;
|
|
|
|
/* Get the session context */
|
|
err = -EBADF;
|
|
session = pppol2tp_sock_to_session(sk);
|
|
if (!session)
|
|
goto end;
|
|
|
|
/* Special case: if session_id == 0x0000, treat as operation on tunnel */
|
|
if (session->session_id == 0 && session->peer_session_id == 0) {
|
|
tunnel = session->tunnel;
|
|
err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
|
|
if (err)
|
|
goto end_put_sess;
|
|
} else {
|
|
err = pppol2tp_session_getsockopt(sk, session, optname, &val);
|
|
if (err)
|
|
goto end_put_sess;
|
|
}
|
|
|
|
err = -EFAULT;
|
|
if (put_user(len, optlen))
|
|
goto end_put_sess;
|
|
|
|
if (copy_to_user((void __user *)optval, &val, len))
|
|
goto end_put_sess;
|
|
|
|
err = 0;
|
|
|
|
end_put_sess:
|
|
sock_put(sk);
|
|
end:
|
|
return err;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* /proc filesystem for debug
|
|
* Since the original pppol2tp driver provided /proc/net/pppol2tp for
|
|
* L2TPv2, we dump only L2TPv2 tunnels and sessions here.
|
|
*****************************************************************************/
|
|
|
|
static unsigned int pppol2tp_net_id;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
struct pppol2tp_seq_data {
|
|
struct seq_net_private p;
|
|
int tunnel_idx; /* current tunnel */
|
|
int session_idx; /* index of session within current tunnel */
|
|
struct l2tp_tunnel *tunnel;
|
|
struct l2tp_session *session; /* NULL means get next tunnel */
|
|
};
|
|
|
|
static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
|
|
{
|
|
/* Drop reference taken during previous invocation */
|
|
if (pd->tunnel)
|
|
l2tp_tunnel_dec_refcount(pd->tunnel);
|
|
|
|
for (;;) {
|
|
pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx);
|
|
pd->tunnel_idx++;
|
|
|
|
/* Only accept L2TPv2 tunnels */
|
|
if (!pd->tunnel || pd->tunnel->version == 2)
|
|
return;
|
|
|
|
l2tp_tunnel_dec_refcount(pd->tunnel);
|
|
}
|
|
}
|
|
|
|
static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
|
|
{
|
|
/* Drop reference taken during previous invocation */
|
|
if (pd->session)
|
|
l2tp_session_dec_refcount(pd->session);
|
|
|
|
pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
|
|
pd->session_idx++;
|
|
|
|
if (!pd->session) {
|
|
pd->session_idx = 0;
|
|
pppol2tp_next_tunnel(net, pd);
|
|
}
|
|
}
|
|
|
|
static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
|
|
{
|
|
struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
|
|
loff_t pos = *offs;
|
|
struct net *net;
|
|
|
|
if (!pos)
|
|
goto out;
|
|
|
|
if (WARN_ON(!m->private)) {
|
|
pd = NULL;
|
|
goto out;
|
|
}
|
|
|
|
pd = m->private;
|
|
net = seq_file_net(m);
|
|
|
|
if (!pd->tunnel)
|
|
pppol2tp_next_tunnel(net, pd);
|
|
else
|
|
pppol2tp_next_session(net, pd);
|
|
|
|
/* NULL tunnel and session indicates end of list */
|
|
if (!pd->tunnel && !pd->session)
|
|
pd = NULL;
|
|
|
|
out:
|
|
return pd;
|
|
}
|
|
|
|
static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
(*pos)++;
|
|
return NULL;
|
|
}
|
|
|
|
static void pppol2tp_seq_stop(struct seq_file *p, void *v)
|
|
{
|
|
struct pppol2tp_seq_data *pd = v;
|
|
|
|
if (!pd || pd == SEQ_START_TOKEN)
|
|
return;
|
|
|
|
/* Drop reference taken by last invocation of pppol2tp_next_session()
|
|
* or pppol2tp_next_tunnel().
|
|
*/
|
|
if (pd->session) {
|
|
l2tp_session_dec_refcount(pd->session);
|
|
pd->session = NULL;
|
|
}
|
|
if (pd->tunnel) {
|
|
l2tp_tunnel_dec_refcount(pd->tunnel);
|
|
pd->tunnel = NULL;
|
|
}
|
|
}
|
|
|
|
static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
|
|
{
|
|
struct l2tp_tunnel *tunnel = v;
|
|
|
|
seq_printf(m, "\nTUNNEL '%s', %c %d\n",
|
|
tunnel->name,
|
|
(tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
|
|
refcount_read(&tunnel->ref_count) - 1);
|
|
seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
|
|
0,
|
|
atomic_long_read(&tunnel->stats.tx_packets),
|
|
atomic_long_read(&tunnel->stats.tx_bytes),
|
|
atomic_long_read(&tunnel->stats.tx_errors),
|
|
atomic_long_read(&tunnel->stats.rx_packets),
|
|
atomic_long_read(&tunnel->stats.rx_bytes),
|
|
atomic_long_read(&tunnel->stats.rx_errors));
|
|
}
|
|
|
|
static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
|
|
{
|
|
struct l2tp_session *session = v;
|
|
struct l2tp_tunnel *tunnel = session->tunnel;
|
|
unsigned char state;
|
|
char user_data_ok;
|
|
struct sock *sk;
|
|
u32 ip = 0;
|
|
u16 port = 0;
|
|
|
|
if (tunnel->sock) {
|
|
struct inet_sock *inet = inet_sk(tunnel->sock);
|
|
|
|
ip = ntohl(inet->inet_saddr);
|
|
port = ntohs(inet->inet_sport);
|
|
}
|
|
|
|
sk = pppol2tp_session_get_sock(session);
|
|
if (sk) {
|
|
state = sk->sk_state;
|
|
user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
|
|
} else {
|
|
state = 0;
|
|
user_data_ok = 'N';
|
|
}
|
|
|
|
seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> %04X/%04X %d %c\n",
|
|
session->name, ip, port,
|
|
tunnel->tunnel_id,
|
|
session->session_id,
|
|
tunnel->peer_tunnel_id,
|
|
session->peer_session_id,
|
|
state, user_data_ok);
|
|
seq_printf(m, " 0/0/%c/%c/%s %08x %u\n",
|
|
session->recv_seq ? 'R' : '-',
|
|
session->send_seq ? 'S' : '-',
|
|
session->lns_mode ? "LNS" : "LAC",
|
|
0,
|
|
jiffies_to_msecs(session->reorder_timeout));
|
|
seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
|
|
session->nr, session->ns,
|
|
atomic_long_read(&session->stats.tx_packets),
|
|
atomic_long_read(&session->stats.tx_bytes),
|
|
atomic_long_read(&session->stats.tx_errors),
|
|
atomic_long_read(&session->stats.rx_packets),
|
|
atomic_long_read(&session->stats.rx_bytes),
|
|
atomic_long_read(&session->stats.rx_errors));
|
|
|
|
if (sk) {
|
|
struct pppox_sock *po = pppox_sk(sk);
|
|
|
|
seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
|
|
sock_put(sk);
|
|
}
|
|
}
|
|
|
|
static int pppol2tp_seq_show(struct seq_file *m, void *v)
|
|
{
|
|
struct pppol2tp_seq_data *pd = v;
|
|
|
|
/* display header on line 1 */
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
|
|
seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
|
|
seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
|
|
seq_puts(m, " SESSION name, addr/port src-tid/sid dest-tid/sid state user-data-ok\n");
|
|
seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
|
|
seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
|
|
goto out;
|
|
}
|
|
|
|
if (!pd->session)
|
|
pppol2tp_seq_tunnel_show(m, pd->tunnel);
|
|
else
|
|
pppol2tp_seq_session_show(m, pd->session);
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations pppol2tp_seq_ops = {
|
|
.start = pppol2tp_seq_start,
|
|
.next = pppol2tp_seq_next,
|
|
.stop = pppol2tp_seq_stop,
|
|
.show = pppol2tp_seq_show,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/*****************************************************************************
|
|
* Network namespace
|
|
*****************************************************************************/
|
|
|
|
static __net_init int pppol2tp_init_net(struct net *net)
|
|
{
|
|
struct proc_dir_entry *pde;
|
|
int err = 0;
|
|
|
|
pde = proc_create_net("pppol2tp", 0444, net->proc_net,
|
|
&pppol2tp_seq_ops, sizeof(struct pppol2tp_seq_data));
|
|
if (!pde) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static __net_exit void pppol2tp_exit_net(struct net *net)
|
|
{
|
|
remove_proc_entry("pppol2tp", net->proc_net);
|
|
}
|
|
|
|
static struct pernet_operations pppol2tp_net_ops = {
|
|
.init = pppol2tp_init_net,
|
|
.exit = pppol2tp_exit_net,
|
|
.id = &pppol2tp_net_id,
|
|
};
|
|
|
|
/*****************************************************************************
|
|
* Init and cleanup
|
|
*****************************************************************************/
|
|
|
|
static const struct proto_ops pppol2tp_ops = {
|
|
.family = AF_PPPOX,
|
|
.owner = THIS_MODULE,
|
|
.release = pppol2tp_release,
|
|
.bind = sock_no_bind,
|
|
.connect = pppol2tp_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = pppol2tp_getname,
|
|
.poll = datagram_poll,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = pppol2tp_setsockopt,
|
|
.getsockopt = pppol2tp_getsockopt,
|
|
.sendmsg = pppol2tp_sendmsg,
|
|
.recvmsg = pppol2tp_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.ioctl = pppox_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = pppox_compat_ioctl,
|
|
#endif
|
|
};
|
|
|
|
static const struct pppox_proto pppol2tp_proto = {
|
|
.create = pppol2tp_create,
|
|
.ioctl = pppol2tp_ioctl,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
#ifdef CONFIG_L2TP_V3
|
|
|
|
static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
|
|
.session_create = pppol2tp_session_create,
|
|
.session_delete = l2tp_session_delete,
|
|
};
|
|
|
|
#endif /* CONFIG_L2TP_V3 */
|
|
|
|
static int __init pppol2tp_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = register_pernet_device(&pppol2tp_net_ops);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = proto_register(&pppol2tp_sk_proto, 0);
|
|
if (err)
|
|
goto out_unregister_pppol2tp_pernet;
|
|
|
|
err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
|
|
if (err)
|
|
goto out_unregister_pppol2tp_proto;
|
|
|
|
#ifdef CONFIG_L2TP_V3
|
|
err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
|
|
if (err)
|
|
goto out_unregister_pppox;
|
|
#endif
|
|
|
|
pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
|
|
|
|
out:
|
|
return err;
|
|
|
|
#ifdef CONFIG_L2TP_V3
|
|
out_unregister_pppox:
|
|
unregister_pppox_proto(PX_PROTO_OL2TP);
|
|
#endif
|
|
out_unregister_pppol2tp_proto:
|
|
proto_unregister(&pppol2tp_sk_proto);
|
|
out_unregister_pppol2tp_pernet:
|
|
unregister_pernet_device(&pppol2tp_net_ops);
|
|
goto out;
|
|
}
|
|
|
|
static void __exit pppol2tp_exit(void)
|
|
{
|
|
#ifdef CONFIG_L2TP_V3
|
|
l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
|
|
#endif
|
|
unregister_pppox_proto(PX_PROTO_OL2TP);
|
|
proto_unregister(&pppol2tp_sk_proto);
|
|
unregister_pernet_device(&pppol2tp_net_ops);
|
|
}
|
|
|
|
module_init(pppol2tp_init);
|
|
module_exit(pppol2tp_exit);
|
|
|
|
MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
|
|
MODULE_DESCRIPTION("PPP over L2TP over UDP");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(PPPOL2TP_DRV_VERSION);
|
|
MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
|
|
MODULE_ALIAS_L2TP_PWTYPE(7);
|