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TOMOYO Linux Cross Reference
Linux/net/l2tp/l2tp_ppp.c

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  1 /*****************************************************************************
  2  * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets
  3  *
  4  * PPPoX    --- Generic PPP encapsulation socket family
  5  * PPPoL2TP --- PPP over L2TP (RFC 2661)
  6  *
  7  * Version:     2.0.0
  8  *
  9  * Authors:     James Chapman (jchapman@katalix.com)
 10  *
 11  * Based on original work by Martijn van Oosterhout <kleptog@svana.org>
 12  *
 13  * License:
 14  *              This program is free software; you can redistribute it and/or
 15  *              modify it under the terms of the GNU General Public License
 16  *              as published by the Free Software Foundation; either version
 17  *              2 of the License, or (at your option) any later version.
 18  *
 19  */
 20 
 21 /* This driver handles only L2TP data frames; control frames are handled by a
 22  * userspace application.
 23  *
 24  * To send data in an L2TP session, userspace opens a PPPoL2TP socket and
 25  * attaches it to a bound UDP socket with local tunnel_id / session_id and
 26  * peer tunnel_id / session_id set. Data can then be sent or received using
 27  * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket
 28  * can be read or modified using ioctl() or [gs]etsockopt() calls.
 29  *
 30  * When a PPPoL2TP socket is connected with local and peer session_id values
 31  * zero, the socket is treated as a special tunnel management socket.
 32  *
 33  * Here's example userspace code to create a socket for sending/receiving data
 34  * over an L2TP session:-
 35  *
 36  *      struct sockaddr_pppol2tp sax;
 37  *      int fd;
 38  *      int session_fd;
 39  *
 40  *      fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
 41  *
 42  *      sax.sa_family = AF_PPPOX;
 43  *      sax.sa_protocol = PX_PROTO_OL2TP;
 44  *      sax.pppol2tp.fd = tunnel_fd;    // bound UDP socket
 45  *      sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr;
 46  *      sax.pppol2tp.addr.sin_port = addr->sin_port;
 47  *      sax.pppol2tp.addr.sin_family = AF_INET;
 48  *      sax.pppol2tp.s_tunnel  = tunnel_id;
 49  *      sax.pppol2tp.s_session = session_id;
 50  *      sax.pppol2tp.d_tunnel  = peer_tunnel_id;
 51  *      sax.pppol2tp.d_session = peer_session_id;
 52  *
 53  *      session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax));
 54  *
 55  * A pppd plugin that allows PPP traffic to be carried over L2TP using
 56  * this driver is available from the OpenL2TP project at
 57  * http://openl2tp.sourceforge.net.
 58  */
 59 
 60 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 61 
 62 #include <linux/module.h>
 63 #include <linux/string.h>
 64 #include <linux/list.h>
 65 #include <linux/uaccess.h>
 66 
 67 #include <linux/kernel.h>
 68 #include <linux/spinlock.h>
 69 #include <linux/kthread.h>
 70 #include <linux/sched.h>
 71 #include <linux/slab.h>
 72 #include <linux/errno.h>
 73 #include <linux/jiffies.h>
 74 
 75 #include <linux/netdevice.h>
 76 #include <linux/net.h>
 77 #include <linux/inetdevice.h>
 78 #include <linux/skbuff.h>
 79 #include <linux/init.h>
 80 #include <linux/ip.h>
 81 #include <linux/udp.h>
 82 #include <linux/if_pppox.h>
 83 #include <linux/if_pppol2tp.h>
 84 #include <net/sock.h>
 85 #include <linux/ppp_channel.h>
 86 #include <linux/ppp_defs.h>
 87 #include <linux/ppp-ioctl.h>
 88 #include <linux/file.h>
 89 #include <linux/hash.h>
 90 #include <linux/sort.h>
 91 #include <linux/proc_fs.h>
 92 #include <linux/l2tp.h>
 93 #include <linux/nsproxy.h>
 94 #include <net/net_namespace.h>
 95 #include <net/netns/generic.h>
 96 #include <net/dst.h>
 97 #include <net/ip.h>
 98 #include <net/udp.h>
 99 #include <net/xfrm.h>
100 #include <net/inet_common.h>
101 
102 #include <asm/byteorder.h>
103 #include <linux/atomic.h>
104 
105 #include "l2tp_core.h"
106 
107 #define PPPOL2TP_DRV_VERSION    "V2.0"
108 
109 /* Space for UDP, L2TP and PPP headers */
110 #define PPPOL2TP_HEADER_OVERHEAD        40
111 
112 /* Number of bytes to build transmit L2TP headers.
113  * Unfortunately the size is different depending on whether sequence numbers
114  * are enabled.
115  */
116 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ              10
117 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ            6
118 
119 /* Private data of each session. This data lives at the end of struct
120  * l2tp_session, referenced via session->priv[].
121  */
122 struct pppol2tp_session {
123         int                     owner;          /* pid that opened the socket */
124 
125         struct mutex            sk_lock;        /* Protects .sk */
126         struct sock __rcu       *sk;            /* Pointer to the session
127                                                  * PPPoX socket */
128         struct sock             *__sk;          /* Copy of .sk, for cleanup */
129         struct rcu_head         rcu;            /* For asynchronous release */
130         int                     flags;          /* accessed by PPPIOCGFLAGS.
131                                                  * Unused. */
132 };
133 
134 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
135 
136 static const struct ppp_channel_ops pppol2tp_chan_ops = {
137         .start_xmit =  pppol2tp_xmit,
138 };
139 
140 static const struct proto_ops pppol2tp_ops;
141 
142 /* Retrieves the pppol2tp socket associated to a session.
143  * A reference is held on the returned socket, so this function must be paired
144  * with sock_put().
145  */
146 static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session)
147 {
148         struct pppol2tp_session *ps = l2tp_session_priv(session);
149         struct sock *sk;
150 
151         rcu_read_lock();
152         sk = rcu_dereference(ps->sk);
153         if (sk)
154                 sock_hold(sk);
155         rcu_read_unlock();
156 
157         return sk;
158 }
159 
160 /* Helpers to obtain tunnel/session contexts from sockets.
161  */
162 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
163 {
164         struct l2tp_session *session;
165 
166         if (sk == NULL)
167                 return NULL;
168 
169         sock_hold(sk);
170         session = (struct l2tp_session *)(sk->sk_user_data);
171         if (session == NULL) {
172                 sock_put(sk);
173                 goto out;
174         }
175 
176         BUG_ON(session->magic != L2TP_SESSION_MAGIC);
177 
178 out:
179         return session;
180 }
181 
182 /*****************************************************************************
183  * Receive data handling
184  *****************************************************************************/
185 
186 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
187 {
188         /* Skip PPP header, if present.  In testing, Microsoft L2TP clients
189          * don't send the PPP header (PPP header compression enabled), but
190          * other clients can include the header. So we cope with both cases
191          * here. The PPP header is always FF03 when using L2TP.
192          *
193          * Note that skb->data[] isn't dereferenced from a u16 ptr here since
194          * the field may be unaligned.
195          */
196         if (!pskb_may_pull(skb, 2))
197                 return 1;
198 
199         if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))
200                 skb_pull(skb, 2);
201 
202         return 0;
203 }
204 
205 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
206  */
207 static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
208                             size_t len, int flags)
209 {
210         int err;
211         struct sk_buff *skb;
212         struct sock *sk = sock->sk;
213 
214         err = -EIO;
215         if (sk->sk_state & PPPOX_BOUND)
216                 goto end;
217 
218         err = 0;
219         skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
220                                 flags & MSG_DONTWAIT, &err);
221         if (!skb)
222                 goto end;
223 
224         if (len > skb->len)
225                 len = skb->len;
226         else if (len < skb->len)
227                 msg->msg_flags |= MSG_TRUNC;
228 
229         err = skb_copy_datagram_msg(skb, 0, msg, len);
230         if (likely(err == 0))
231                 err = len;
232 
233         kfree_skb(skb);
234 end:
235         return err;
236 }
237 
238 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
239 {
240         struct pppol2tp_session *ps = l2tp_session_priv(session);
241         struct sock *sk = NULL;
242 
243         /* If the socket is bound, send it in to PPP's input queue. Otherwise
244          * queue it on the session socket.
245          */
246         rcu_read_lock();
247         sk = rcu_dereference(ps->sk);
248         if (sk == NULL)
249                 goto no_sock;
250 
251         if (sk->sk_state & PPPOX_BOUND) {
252                 struct pppox_sock *po;
253 
254                 l2tp_dbg(session, L2TP_MSG_DATA,
255                          "%s: recv %d byte data frame, passing to ppp\n",
256                          session->name, data_len);
257 
258                 po = pppox_sk(sk);
259                 ppp_input(&po->chan, skb);
260         } else {
261                 l2tp_dbg(session, L2TP_MSG_DATA,
262                          "%s: recv %d byte data frame, passing to L2TP socket\n",
263                          session->name, data_len);
264 
265                 if (sock_queue_rcv_skb(sk, skb) < 0) {
266                         atomic_long_inc(&session->stats.rx_errors);
267                         kfree_skb(skb);
268                 }
269         }
270         rcu_read_unlock();
271 
272         return;
273 
274 no_sock:
275         rcu_read_unlock();
276         l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name);
277         kfree_skb(skb);
278 }
279 
280 /************************************************************************
281  * Transmit handling
282  ***********************************************************************/
283 
284 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket.  We come here
285  * when a user application does a sendmsg() on the session socket. L2TP and
286  * PPP headers must be inserted into the user's data.
287  */
288 static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
289                             size_t total_len)
290 {
291         struct sock *sk = sock->sk;
292         struct sk_buff *skb;
293         int error;
294         struct l2tp_session *session;
295         struct l2tp_tunnel *tunnel;
296         int uhlen;
297 
298         error = -ENOTCONN;
299         if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
300                 goto error;
301 
302         /* Get session and tunnel contexts */
303         error = -EBADF;
304         session = pppol2tp_sock_to_session(sk);
305         if (session == NULL)
306                 goto error;
307 
308         tunnel = session->tunnel;
309 
310         uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
311 
312         /* Allocate a socket buffer */
313         error = -ENOMEM;
314         skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
315                            uhlen + session->hdr_len +
316                            2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
317                            0, GFP_KERNEL);
318         if (!skb)
319                 goto error_put_sess;
320 
321         /* Reserve space for headers. */
322         skb_reserve(skb, NET_SKB_PAD);
323         skb_reset_network_header(skb);
324         skb_reserve(skb, sizeof(struct iphdr));
325         skb_reset_transport_header(skb);
326         skb_reserve(skb, uhlen);
327 
328         /* Add PPP header */
329         skb->data[0] = PPP_ALLSTATIONS;
330         skb->data[1] = PPP_UI;
331         skb_put(skb, 2);
332 
333         /* Copy user data into skb */
334         error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
335         if (error < 0) {
336                 kfree_skb(skb);
337                 goto error_put_sess;
338         }
339 
340         local_bh_disable();
341         l2tp_xmit_skb(session, skb, session->hdr_len);
342         local_bh_enable();
343 
344         sock_put(sk);
345 
346         return total_len;
347 
348 error_put_sess:
349         sock_put(sk);
350 error:
351         return error;
352 }
353 
354 /* Transmit function called by generic PPP driver.  Sends PPP frame
355  * over PPPoL2TP socket.
356  *
357  * This is almost the same as pppol2tp_sendmsg(), but rather than
358  * being called with a msghdr from userspace, it is called with a skb
359  * from the kernel.
360  *
361  * The supplied skb from ppp doesn't have enough headroom for the
362  * insertion of L2TP, UDP and IP headers so we need to allocate more
363  * headroom in the skb. This will create a cloned skb. But we must be
364  * careful in the error case because the caller will expect to free
365  * the skb it supplied, not our cloned skb. So we take care to always
366  * leave the original skb unfreed if we return an error.
367  */
368 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
369 {
370         struct sock *sk = (struct sock *) chan->private;
371         struct l2tp_session *session;
372         struct l2tp_tunnel *tunnel;
373         int uhlen, headroom;
374 
375         if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
376                 goto abort;
377 
378         /* Get session and tunnel contexts from the socket */
379         session = pppol2tp_sock_to_session(sk);
380         if (session == NULL)
381                 goto abort;
382 
383         tunnel = session->tunnel;
384 
385         uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
386         headroom = NET_SKB_PAD +
387                    sizeof(struct iphdr) + /* IP header */
388                    uhlen +              /* UDP header (if L2TP_ENCAPTYPE_UDP) */
389                    session->hdr_len +   /* L2TP header */
390                    2;                   /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
391         if (skb_cow_head(skb, headroom))
392                 goto abort_put_sess;
393 
394         /* Setup PPP header */
395         __skb_push(skb, 2);
396         skb->data[0] = PPP_ALLSTATIONS;
397         skb->data[1] = PPP_UI;
398 
399         local_bh_disable();
400         l2tp_xmit_skb(session, skb, session->hdr_len);
401         local_bh_enable();
402 
403         sock_put(sk);
404 
405         return 1;
406 
407 abort_put_sess:
408         sock_put(sk);
409 abort:
410         /* Free the original skb */
411         kfree_skb(skb);
412         return 1;
413 }
414 
415 /*****************************************************************************
416  * Session (and tunnel control) socket create/destroy.
417  *****************************************************************************/
418 
419 static void pppol2tp_put_sk(struct rcu_head *head)
420 {
421         struct pppol2tp_session *ps;
422 
423         ps = container_of(head, typeof(*ps), rcu);
424         sock_put(ps->__sk);
425 }
426 
427 /* Called by l2tp_core when a session socket is being closed.
428  */
429 static void pppol2tp_session_close(struct l2tp_session *session)
430 {
431 }
432 
433 /* Really kill the session socket. (Called from sock_put() if
434  * refcnt == 0.)
435  */
436 static void pppol2tp_session_destruct(struct sock *sk)
437 {
438         struct l2tp_session *session = sk->sk_user_data;
439 
440         skb_queue_purge(&sk->sk_receive_queue);
441         skb_queue_purge(&sk->sk_write_queue);
442 
443         if (session) {
444                 sk->sk_user_data = NULL;
445                 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
446                 l2tp_session_dec_refcount(session);
447         }
448 }
449 
450 /* Called when the PPPoX socket (session) is closed.
451  */
452 static int pppol2tp_release(struct socket *sock)
453 {
454         struct sock *sk = sock->sk;
455         struct l2tp_session *session;
456         int error;
457 
458         if (!sk)
459                 return 0;
460 
461         error = -EBADF;
462         lock_sock(sk);
463         if (sock_flag(sk, SOCK_DEAD) != 0)
464                 goto error;
465 
466         pppox_unbind_sock(sk);
467 
468         /* Signal the death of the socket. */
469         sk->sk_state = PPPOX_DEAD;
470         sock_orphan(sk);
471         sock->sk = NULL;
472 
473         session = pppol2tp_sock_to_session(sk);
474         if (session) {
475                 struct pppol2tp_session *ps;
476 
477                 l2tp_session_delete(session);
478 
479                 ps = l2tp_session_priv(session);
480                 mutex_lock(&ps->sk_lock);
481                 ps->__sk = rcu_dereference_protected(ps->sk,
482                                                      lockdep_is_held(&ps->sk_lock));
483                 RCU_INIT_POINTER(ps->sk, NULL);
484                 mutex_unlock(&ps->sk_lock);
485                 call_rcu(&ps->rcu, pppol2tp_put_sk);
486 
487                 /* Rely on the sock_put() call at the end of the function for
488                  * dropping the reference held by pppol2tp_sock_to_session().
489                  * The last reference will be dropped by pppol2tp_put_sk().
490                  */
491         }
492 
493         release_sock(sk);
494 
495         /* This will delete the session context via
496          * pppol2tp_session_destruct() if the socket's refcnt drops to
497          * zero.
498          */
499         sock_put(sk);
500 
501         return 0;
502 
503 error:
504         release_sock(sk);
505         return error;
506 }
507 
508 static struct proto pppol2tp_sk_proto = {
509         .name     = "PPPOL2TP",
510         .owner    = THIS_MODULE,
511         .obj_size = sizeof(struct pppox_sock),
512 };
513 
514 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
515 {
516         int rc;
517 
518         rc = l2tp_udp_encap_recv(sk, skb);
519         if (rc)
520                 kfree_skb(skb);
521 
522         return NET_RX_SUCCESS;
523 }
524 
525 /* socket() handler. Initialize a new struct sock.
526  */
527 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
528 {
529         int error = -ENOMEM;
530         struct sock *sk;
531 
532         sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
533         if (!sk)
534                 goto out;
535 
536         sock_init_data(sock, sk);
537 
538         sock->state  = SS_UNCONNECTED;
539         sock->ops    = &pppol2tp_ops;
540 
541         sk->sk_backlog_rcv = pppol2tp_backlog_recv;
542         sk->sk_protocol    = PX_PROTO_OL2TP;
543         sk->sk_family      = PF_PPPOX;
544         sk->sk_state       = PPPOX_NONE;
545         sk->sk_type        = SOCK_STREAM;
546         sk->sk_destruct    = pppol2tp_session_destruct;
547 
548         error = 0;
549 
550 out:
551         return error;
552 }
553 
554 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
555 static void pppol2tp_show(struct seq_file *m, void *arg)
556 {
557         struct l2tp_session *session = arg;
558         struct sock *sk;
559 
560         sk = pppol2tp_session_get_sock(session);
561         if (sk) {
562                 struct pppox_sock *po = pppox_sk(sk);
563 
564                 seq_printf(m, "   interface %s\n", ppp_dev_name(&po->chan));
565                 sock_put(sk);
566         }
567 }
568 #endif
569 
570 static void pppol2tp_session_init(struct l2tp_session *session)
571 {
572         struct pppol2tp_session *ps;
573         struct dst_entry *dst;
574 
575         session->recv_skb = pppol2tp_recv;
576         session->session_close = pppol2tp_session_close;
577 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
578         session->show = pppol2tp_show;
579 #endif
580 
581         ps = l2tp_session_priv(session);
582         mutex_init(&ps->sk_lock);
583         ps->owner = current->pid;
584 
585         /* If PMTU discovery was enabled, use the MTU that was discovered */
586         dst = sk_dst_get(session->tunnel->sock);
587         if (dst) {
588                 u32 pmtu = dst_mtu(dst);
589 
590                 if (pmtu) {
591                         session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
592                         session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
593                 }
594                 dst_release(dst);
595         }
596 }
597 
598 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
599  */
600 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
601                             int sockaddr_len, int flags)
602 {
603         struct sock *sk = sock->sk;
604         struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
605         struct pppox_sock *po = pppox_sk(sk);
606         struct l2tp_session *session = NULL;
607         struct l2tp_tunnel *tunnel;
608         struct pppol2tp_session *ps;
609         struct l2tp_session_cfg cfg = { 0, };
610         int error = 0;
611         u32 tunnel_id, peer_tunnel_id;
612         u32 session_id, peer_session_id;
613         bool drop_refcnt = false;
614         bool drop_tunnel = false;
615         int ver = 2;
616         int fd;
617 
618         lock_sock(sk);
619 
620         error = -EINVAL;
621 
622         if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) &&
623             sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) &&
624             sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) &&
625             sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6))
626                 goto end;
627 
628         if (sp->sa_protocol != PX_PROTO_OL2TP)
629                 goto end;
630 
631         /* Check for already bound sockets */
632         error = -EBUSY;
633         if (sk->sk_state & PPPOX_CONNECTED)
634                 goto end;
635 
636         /* We don't supporting rebinding anyway */
637         error = -EALREADY;
638         if (sk->sk_user_data)
639                 goto end; /* socket is already attached */
640 
641         /* Get params from socket address. Handle L2TPv2 and L2TPv3.
642          * This is nasty because there are different sockaddr_pppol2tp
643          * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
644          * the sockaddr size to determine which structure the caller
645          * is using.
646          */
647         peer_tunnel_id = 0;
648         if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
649                 fd = sp->pppol2tp.fd;
650                 tunnel_id = sp->pppol2tp.s_tunnel;
651                 peer_tunnel_id = sp->pppol2tp.d_tunnel;
652                 session_id = sp->pppol2tp.s_session;
653                 peer_session_id = sp->pppol2tp.d_session;
654         } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
655                 struct sockaddr_pppol2tpv3 *sp3 =
656                         (struct sockaddr_pppol2tpv3 *) sp;
657                 ver = 3;
658                 fd = sp3->pppol2tp.fd;
659                 tunnel_id = sp3->pppol2tp.s_tunnel;
660                 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
661                 session_id = sp3->pppol2tp.s_session;
662                 peer_session_id = sp3->pppol2tp.d_session;
663         } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
664                 struct sockaddr_pppol2tpin6 *sp6 =
665                         (struct sockaddr_pppol2tpin6 *) sp;
666                 fd = sp6->pppol2tp.fd;
667                 tunnel_id = sp6->pppol2tp.s_tunnel;
668                 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
669                 session_id = sp6->pppol2tp.s_session;
670                 peer_session_id = sp6->pppol2tp.d_session;
671         } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
672                 struct sockaddr_pppol2tpv3in6 *sp6 =
673                         (struct sockaddr_pppol2tpv3in6 *) sp;
674                 ver = 3;
675                 fd = sp6->pppol2tp.fd;
676                 tunnel_id = sp6->pppol2tp.s_tunnel;
677                 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
678                 session_id = sp6->pppol2tp.s_session;
679                 peer_session_id = sp6->pppol2tp.d_session;
680         } else {
681                 error = -EINVAL;
682                 goto end; /* bad socket address */
683         }
684 
685         /* Don't bind if tunnel_id is 0 */
686         error = -EINVAL;
687         if (tunnel_id == 0)
688                 goto end;
689 
690         tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
691         if (tunnel)
692                 drop_tunnel = true;
693 
694         /* Special case: create tunnel context if session_id and
695          * peer_session_id is 0. Otherwise look up tunnel using supplied
696          * tunnel id.
697          */
698         if ((session_id == 0) && (peer_session_id == 0)) {
699                 if (tunnel == NULL) {
700                         struct l2tp_tunnel_cfg tcfg = {
701                                 .encap = L2TP_ENCAPTYPE_UDP,
702                                 .debug = 0,
703                         };
704                         error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
705                         if (error < 0)
706                                 goto end;
707 
708                         l2tp_tunnel_inc_refcount(tunnel);
709                         error = l2tp_tunnel_register(tunnel, sock_net(sk),
710                                                      &tcfg);
711                         if (error < 0) {
712                                 kfree(tunnel);
713                                 goto end;
714                         }
715                         drop_tunnel = true;
716                 }
717         } else {
718                 /* Error if we can't find the tunnel */
719                 error = -ENOENT;
720                 if (tunnel == NULL)
721                         goto end;
722 
723                 /* Error if socket is not prepped */
724                 if (tunnel->sock == NULL)
725                         goto end;
726         }
727 
728         if (tunnel->recv_payload_hook == NULL)
729                 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
730 
731         if (tunnel->peer_tunnel_id == 0)
732                 tunnel->peer_tunnel_id = peer_tunnel_id;
733 
734         session = l2tp_session_get(sock_net(sk), tunnel, session_id);
735         if (session) {
736                 drop_refcnt = true;
737                 ps = l2tp_session_priv(session);
738 
739                 /* Using a pre-existing session is fine as long as it hasn't
740                  * been connected yet.
741                  */
742                 mutex_lock(&ps->sk_lock);
743                 if (rcu_dereference_protected(ps->sk,
744                                               lockdep_is_held(&ps->sk_lock)) ||
745                     ps->__sk) {
746                         mutex_unlock(&ps->sk_lock);
747                         error = -EEXIST;
748                         goto end;
749                 }
750         } else {
751                 /* Default MTU must allow space for UDP/L2TP/PPP headers */
752                 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
753                 cfg.mru = cfg.mtu;
754 
755                 session = l2tp_session_create(sizeof(struct pppol2tp_session),
756                                               tunnel, session_id,
757                                               peer_session_id, &cfg);
758                 if (IS_ERR(session)) {
759                         error = PTR_ERR(session);
760                         goto end;
761                 }
762 
763                 pppol2tp_session_init(session);
764                 ps = l2tp_session_priv(session);
765                 l2tp_session_inc_refcount(session);
766 
767                 mutex_lock(&ps->sk_lock);
768                 error = l2tp_session_register(session, tunnel);
769                 if (error < 0) {
770                         mutex_unlock(&ps->sk_lock);
771                         kfree(session);
772                         goto end;
773                 }
774                 drop_refcnt = true;
775         }
776 
777         /* Special case: if source & dest session_id == 0x0000, this
778          * socket is being created to manage the tunnel. Just set up
779          * the internal context for use by ioctl() and sockopt()
780          * handlers.
781          */
782         if ((session->session_id == 0) &&
783             (session->peer_session_id == 0)) {
784                 error = 0;
785                 goto out_no_ppp;
786         }
787 
788         /* The only header we need to worry about is the L2TP
789          * header. This size is different depending on whether
790          * sequence numbers are enabled for the data channel.
791          */
792         po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
793 
794         po->chan.private = sk;
795         po->chan.ops     = &pppol2tp_chan_ops;
796         po->chan.mtu     = session->mtu;
797 
798         error = ppp_register_net_channel(sock_net(sk), &po->chan);
799         if (error) {
800                 mutex_unlock(&ps->sk_lock);
801                 goto end;
802         }
803 
804 out_no_ppp:
805         /* This is how we get the session context from the socket. */
806         sk->sk_user_data = session;
807         rcu_assign_pointer(ps->sk, sk);
808         mutex_unlock(&ps->sk_lock);
809 
810         /* Keep the reference we've grabbed on the session: sk doesn't expect
811          * the session to disappear. pppol2tp_session_destruct() is responsible
812          * for dropping it.
813          */
814         drop_refcnt = false;
815 
816         sk->sk_state = PPPOX_CONNECTED;
817         l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
818                   session->name);
819 
820 end:
821         if (drop_refcnt)
822                 l2tp_session_dec_refcount(session);
823         if (drop_tunnel)
824                 l2tp_tunnel_dec_refcount(tunnel);
825         release_sock(sk);
826 
827         return error;
828 }
829 
830 #ifdef CONFIG_L2TP_V3
831 
832 /* Called when creating sessions via the netlink interface. */
833 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
834                                    u32 session_id, u32 peer_session_id,
835                                    struct l2tp_session_cfg *cfg)
836 {
837         int error;
838         struct l2tp_session *session;
839 
840         /* Error if tunnel socket is not prepped */
841         if (!tunnel->sock) {
842                 error = -ENOENT;
843                 goto err;
844         }
845 
846         /* Default MTU values. */
847         if (cfg->mtu == 0)
848                 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
849         if (cfg->mru == 0)
850                 cfg->mru = cfg->mtu;
851 
852         /* Allocate and initialize a new session context. */
853         session = l2tp_session_create(sizeof(struct pppol2tp_session),
854                                       tunnel, session_id,
855                                       peer_session_id, cfg);
856         if (IS_ERR(session)) {
857                 error = PTR_ERR(session);
858                 goto err;
859         }
860 
861         pppol2tp_session_init(session);
862 
863         error = l2tp_session_register(session, tunnel);
864         if (error < 0)
865                 goto err_sess;
866 
867         return 0;
868 
869 err_sess:
870         kfree(session);
871 err:
872         return error;
873 }
874 
875 #endif /* CONFIG_L2TP_V3 */
876 
877 /* getname() support.
878  */
879 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
880                             int *usockaddr_len, int peer)
881 {
882         int len = 0;
883         int error = 0;
884         struct l2tp_session *session;
885         struct l2tp_tunnel *tunnel;
886         struct sock *sk = sock->sk;
887         struct inet_sock *inet;
888         struct pppol2tp_session *pls;
889 
890         error = -ENOTCONN;
891         if (sk == NULL)
892                 goto end;
893         if (!(sk->sk_state & PPPOX_CONNECTED))
894                 goto end;
895 
896         error = -EBADF;
897         session = pppol2tp_sock_to_session(sk);
898         if (session == NULL)
899                 goto end;
900 
901         pls = l2tp_session_priv(session);
902         tunnel = session->tunnel;
903 
904         inet = inet_sk(tunnel->sock);
905         if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
906                 struct sockaddr_pppol2tp sp;
907                 len = sizeof(sp);
908                 memset(&sp, 0, len);
909                 sp.sa_family    = AF_PPPOX;
910                 sp.sa_protocol  = PX_PROTO_OL2TP;
911                 sp.pppol2tp.fd  = tunnel->fd;
912                 sp.pppol2tp.pid = pls->owner;
913                 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
914                 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
915                 sp.pppol2tp.s_session = session->session_id;
916                 sp.pppol2tp.d_session = session->peer_session_id;
917                 sp.pppol2tp.addr.sin_family = AF_INET;
918                 sp.pppol2tp.addr.sin_port = inet->inet_dport;
919                 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
920                 memcpy(uaddr, &sp, len);
921 #if IS_ENABLED(CONFIG_IPV6)
922         } else if ((tunnel->version == 2) &&
923                    (tunnel->sock->sk_family == AF_INET6)) {
924                 struct sockaddr_pppol2tpin6 sp;
925 
926                 len = sizeof(sp);
927                 memset(&sp, 0, len);
928                 sp.sa_family    = AF_PPPOX;
929                 sp.sa_protocol  = PX_PROTO_OL2TP;
930                 sp.pppol2tp.fd  = tunnel->fd;
931                 sp.pppol2tp.pid = pls->owner;
932                 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
933                 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
934                 sp.pppol2tp.s_session = session->session_id;
935                 sp.pppol2tp.d_session = session->peer_session_id;
936                 sp.pppol2tp.addr.sin6_family = AF_INET6;
937                 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
938                 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
939                        sizeof(tunnel->sock->sk_v6_daddr));
940                 memcpy(uaddr, &sp, len);
941         } else if ((tunnel->version == 3) &&
942                    (tunnel->sock->sk_family == AF_INET6)) {
943                 struct sockaddr_pppol2tpv3in6 sp;
944 
945                 len = sizeof(sp);
946                 memset(&sp, 0, len);
947                 sp.sa_family    = AF_PPPOX;
948                 sp.sa_protocol  = PX_PROTO_OL2TP;
949                 sp.pppol2tp.fd  = tunnel->fd;
950                 sp.pppol2tp.pid = pls->owner;
951                 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
952                 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
953                 sp.pppol2tp.s_session = session->session_id;
954                 sp.pppol2tp.d_session = session->peer_session_id;
955                 sp.pppol2tp.addr.sin6_family = AF_INET6;
956                 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
957                 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
958                        sizeof(tunnel->sock->sk_v6_daddr));
959                 memcpy(uaddr, &sp, len);
960 #endif
961         } else if (tunnel->version == 3) {
962                 struct sockaddr_pppol2tpv3 sp;
963                 len = sizeof(sp);
964                 memset(&sp, 0, len);
965                 sp.sa_family    = AF_PPPOX;
966                 sp.sa_protocol  = PX_PROTO_OL2TP;
967                 sp.pppol2tp.fd  = tunnel->fd;
968                 sp.pppol2tp.pid = pls->owner;
969                 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
970                 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
971                 sp.pppol2tp.s_session = session->session_id;
972                 sp.pppol2tp.d_session = session->peer_session_id;
973                 sp.pppol2tp.addr.sin_family = AF_INET;
974                 sp.pppol2tp.addr.sin_port = inet->inet_dport;
975                 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
976                 memcpy(uaddr, &sp, len);
977         }
978 
979         *usockaddr_len = len;
980         error = 0;
981 
982         sock_put(sk);
983 end:
984         return error;
985 }
986 
987 /****************************************************************************
988  * ioctl() handlers.
989  *
990  * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
991  * sockets. However, in order to control kernel tunnel features, we allow
992  * userspace to create a special "tunnel" PPPoX socket which is used for
993  * control only.  Tunnel PPPoX sockets have session_id == 0 and simply allow
994  * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
995  * calls.
996  ****************************************************************************/
997 
998 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
999                                 struct l2tp_stats *stats)
1000 {
1001         dest->tx_packets = atomic_long_read(&stats->tx_packets);
1002         dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
1003         dest->tx_errors = atomic_long_read(&stats->tx_errors);
1004         dest->rx_packets = atomic_long_read(&stats->rx_packets);
1005         dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1006         dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1007         dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1008         dest->rx_errors = atomic_long_read(&stats->rx_errors);
1009 }
1010 
1011 /* Session ioctl helper.
1012  */
1013 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1014                                   unsigned int cmd, unsigned long arg)
1015 {
1016         struct ifreq ifr;
1017         int err = 0;
1018         struct sock *sk;
1019         int val = (int) arg;
1020         struct pppol2tp_session *ps = l2tp_session_priv(session);
1021         struct l2tp_tunnel *tunnel = session->tunnel;
1022         struct pppol2tp_ioc_stats stats;
1023 
1024         l2tp_dbg(session, L2TP_MSG_CONTROL,
1025                  "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1026                  session->name, cmd, arg);
1027 
1028         sk = pppol2tp_session_get_sock(session);
1029         if (!sk)
1030                 return -EBADR;
1031 
1032         switch (cmd) {
1033         case SIOCGIFMTU:
1034                 err = -ENXIO;
1035                 if (!(sk->sk_state & PPPOX_CONNECTED))
1036                         break;
1037 
1038                 err = -EFAULT;
1039                 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1040                         break;
1041                 ifr.ifr_mtu = session->mtu;
1042                 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1043                         break;
1044 
1045                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1046                           session->name, session->mtu);
1047                 err = 0;
1048                 break;
1049 
1050         case SIOCSIFMTU:
1051                 err = -ENXIO;
1052                 if (!(sk->sk_state & PPPOX_CONNECTED))
1053                         break;
1054 
1055                 err = -EFAULT;
1056                 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1057                         break;
1058 
1059                 session->mtu = ifr.ifr_mtu;
1060 
1061                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1062                           session->name, session->mtu);
1063                 err = 0;
1064                 break;
1065 
1066         case PPPIOCGMRU:
1067                 err = -ENXIO;
1068                 if (!(sk->sk_state & PPPOX_CONNECTED))
1069                         break;
1070 
1071                 err = -EFAULT;
1072                 if (put_user(session->mru, (int __user *) arg))
1073                         break;
1074 
1075                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1076                           session->name, session->mru);
1077                 err = 0;
1078                 break;
1079 
1080         case PPPIOCSMRU:
1081                 err = -ENXIO;
1082                 if (!(sk->sk_state & PPPOX_CONNECTED))
1083                         break;
1084 
1085                 err = -EFAULT;
1086                 if (get_user(val, (int __user *) arg))
1087                         break;
1088 
1089                 session->mru = val;
1090                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1091                           session->name, session->mru);
1092                 err = 0;
1093                 break;
1094 
1095         case PPPIOCGFLAGS:
1096                 err = -EFAULT;
1097                 if (put_user(ps->flags, (int __user *) arg))
1098                         break;
1099 
1100                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1101                           session->name, ps->flags);
1102                 err = 0;
1103                 break;
1104 
1105         case PPPIOCSFLAGS:
1106                 err = -EFAULT;
1107                 if (get_user(val, (int __user *) arg))
1108                         break;
1109                 ps->flags = val;
1110                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1111                           session->name, ps->flags);
1112                 err = 0;
1113                 break;
1114 
1115         case PPPIOCGL2TPSTATS:
1116                 err = -ENXIO;
1117                 if (!(sk->sk_state & PPPOX_CONNECTED))
1118                         break;
1119 
1120                 memset(&stats, 0, sizeof(stats));
1121                 stats.tunnel_id = tunnel->tunnel_id;
1122                 stats.session_id = session->session_id;
1123                 pppol2tp_copy_stats(&stats, &session->stats);
1124                 if (copy_to_user((void __user *) arg, &stats,
1125                                  sizeof(stats)))
1126                         break;
1127                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1128                           session->name);
1129                 err = 0;
1130                 break;
1131 
1132         default:
1133                 err = -ENOSYS;
1134                 break;
1135         }
1136 
1137         sock_put(sk);
1138 
1139         return err;
1140 }
1141 
1142 /* Tunnel ioctl helper.
1143  *
1144  * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1145  * specifies a session_id, the session ioctl handler is called. This allows an
1146  * application to retrieve session stats via a tunnel socket.
1147  */
1148 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1149                                  unsigned int cmd, unsigned long arg)
1150 {
1151         int err = 0;
1152         struct sock *sk;
1153         struct pppol2tp_ioc_stats stats;
1154 
1155         l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1156                  "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1157                  tunnel->name, cmd, arg);
1158 
1159         sk = tunnel->sock;
1160         sock_hold(sk);
1161 
1162         switch (cmd) {
1163         case PPPIOCGL2TPSTATS:
1164                 err = -ENXIO;
1165                 if (!(sk->sk_state & PPPOX_CONNECTED))
1166                         break;
1167 
1168                 if (copy_from_user(&stats, (void __user *) arg,
1169                                    sizeof(stats))) {
1170                         err = -EFAULT;
1171                         break;
1172                 }
1173                 if (stats.session_id != 0) {
1174                         /* resend to session ioctl handler */
1175                         struct l2tp_session *session =
1176                                 l2tp_session_get(sock_net(sk), tunnel,
1177                                                  stats.session_id);
1178 
1179                         if (session) {
1180                                 err = pppol2tp_session_ioctl(session, cmd,
1181                                                              arg);
1182                                 l2tp_session_dec_refcount(session);
1183                         } else {
1184                                 err = -EBADR;
1185                         }
1186                         break;
1187                 }
1188 #ifdef CONFIG_XFRM
1189                 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1190 #endif
1191                 pppol2tp_copy_stats(&stats, &tunnel->stats);
1192                 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1193                         err = -EFAULT;
1194                         break;
1195                 }
1196                 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1197                           tunnel->name);
1198                 err = 0;
1199                 break;
1200 
1201         default:
1202                 err = -ENOSYS;
1203                 break;
1204         }
1205 
1206         sock_put(sk);
1207 
1208         return err;
1209 }
1210 
1211 /* Main ioctl() handler.
1212  * Dispatch to tunnel or session helpers depending on the socket.
1213  */
1214 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1215                           unsigned long arg)
1216 {
1217         struct sock *sk = sock->sk;
1218         struct l2tp_session *session;
1219         struct l2tp_tunnel *tunnel;
1220         int err;
1221 
1222         if (!sk)
1223                 return 0;
1224 
1225         err = -EBADF;
1226         if (sock_flag(sk, SOCK_DEAD) != 0)
1227                 goto end;
1228 
1229         err = -ENOTCONN;
1230         if ((sk->sk_user_data == NULL) ||
1231             (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1232                 goto end;
1233 
1234         /* Get session context from the socket */
1235         err = -EBADF;
1236         session = pppol2tp_sock_to_session(sk);
1237         if (session == NULL)
1238                 goto end;
1239 
1240         /* Special case: if session's session_id is zero, treat ioctl as a
1241          * tunnel ioctl
1242          */
1243         if ((session->session_id == 0) &&
1244             (session->peer_session_id == 0)) {
1245                 tunnel = session->tunnel;
1246                 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1247                 goto end_put_sess;
1248         }
1249 
1250         err = pppol2tp_session_ioctl(session, cmd, arg);
1251 
1252 end_put_sess:
1253         sock_put(sk);
1254 end:
1255         return err;
1256 }
1257 
1258 /*****************************************************************************
1259  * setsockopt() / getsockopt() support.
1260  *
1261  * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1262  * sockets. In order to control kernel tunnel features, we allow userspace to
1263  * create a special "tunnel" PPPoX socket which is used for control only.
1264  * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1265  * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1266  *****************************************************************************/
1267 
1268 /* Tunnel setsockopt() helper.
1269  */
1270 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1271                                       struct l2tp_tunnel *tunnel,
1272                                       int optname, int val)
1273 {
1274         int err = 0;
1275 
1276         switch (optname) {
1277         case PPPOL2TP_SO_DEBUG:
1278                 tunnel->debug = val;
1279                 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1280                           tunnel->name, tunnel->debug);
1281                 break;
1282 
1283         default:
1284                 err = -ENOPROTOOPT;
1285                 break;
1286         }
1287 
1288         return err;
1289 }
1290 
1291 /* Session setsockopt helper.
1292  */
1293 static int pppol2tp_session_setsockopt(struct sock *sk,
1294                                        struct l2tp_session *session,
1295                                        int optname, int val)
1296 {
1297         int err = 0;
1298 
1299         switch (optname) {
1300         case PPPOL2TP_SO_RECVSEQ:
1301                 if ((val != 0) && (val != 1)) {
1302                         err = -EINVAL;
1303                         break;
1304                 }
1305                 session->recv_seq = !!val;
1306                 l2tp_info(session, L2TP_MSG_CONTROL,
1307                           "%s: set recv_seq=%d\n",
1308                           session->name, session->recv_seq);
1309                 break;
1310 
1311         case PPPOL2TP_SO_SENDSEQ:
1312                 if ((val != 0) && (val != 1)) {
1313                         err = -EINVAL;
1314                         break;
1315                 }
1316                 session->send_seq = !!val;
1317                 {
1318                         struct pppox_sock *po = pppox_sk(sk);
1319 
1320                         po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1321                                 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1322                 }
1323                 l2tp_session_set_header_len(session, session->tunnel->version);
1324                 l2tp_info(session, L2TP_MSG_CONTROL,
1325                           "%s: set send_seq=%d\n",
1326                           session->name, session->send_seq);
1327                 break;
1328 
1329         case PPPOL2TP_SO_LNSMODE:
1330                 if ((val != 0) && (val != 1)) {
1331                         err = -EINVAL;
1332                         break;
1333                 }
1334                 session->lns_mode = !!val;
1335                 l2tp_info(session, L2TP_MSG_CONTROL,
1336                           "%s: set lns_mode=%d\n",
1337                           session->name, session->lns_mode);
1338                 break;
1339 
1340         case PPPOL2TP_SO_DEBUG:
1341                 session->debug = val;
1342                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1343                           session->name, session->debug);
1344                 break;
1345 
1346         case PPPOL2TP_SO_REORDERTO:
1347                 session->reorder_timeout = msecs_to_jiffies(val);
1348                 l2tp_info(session, L2TP_MSG_CONTROL,
1349                           "%s: set reorder_timeout=%d\n",
1350                           session->name, session->reorder_timeout);
1351                 break;
1352 
1353         default:
1354                 err = -ENOPROTOOPT;
1355                 break;
1356         }
1357 
1358         return err;
1359 }
1360 
1361 /* Main setsockopt() entry point.
1362  * Does API checks, then calls either the tunnel or session setsockopt
1363  * handler, according to whether the PPPoL2TP socket is a for a regular
1364  * session or the special tunnel type.
1365  */
1366 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1367                                char __user *optval, unsigned int optlen)
1368 {
1369         struct sock *sk = sock->sk;
1370         struct l2tp_session *session;
1371         struct l2tp_tunnel *tunnel;
1372         int val;
1373         int err;
1374 
1375         if (level != SOL_PPPOL2TP)
1376                 return -EINVAL;
1377 
1378         if (optlen < sizeof(int))
1379                 return -EINVAL;
1380 
1381         if (get_user(val, (int __user *)optval))
1382                 return -EFAULT;
1383 
1384         err = -ENOTCONN;
1385         if (sk->sk_user_data == NULL)
1386                 goto end;
1387 
1388         /* Get session context from the socket */
1389         err = -EBADF;
1390         session = pppol2tp_sock_to_session(sk);
1391         if (session == NULL)
1392                 goto end;
1393 
1394         /* Special case: if session_id == 0x0000, treat as operation on tunnel
1395          */
1396         if ((session->session_id == 0) &&
1397             (session->peer_session_id == 0)) {
1398                 tunnel = session->tunnel;
1399                 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1400         } else {
1401                 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1402         }
1403 
1404         sock_put(sk);
1405 end:
1406         return err;
1407 }
1408 
1409 /* Tunnel getsockopt helper. Called with sock locked.
1410  */
1411 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1412                                       struct l2tp_tunnel *tunnel,
1413                                       int optname, int *val)
1414 {
1415         int err = 0;
1416 
1417         switch (optname) {
1418         case PPPOL2TP_SO_DEBUG:
1419                 *val = tunnel->debug;
1420                 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1421                           tunnel->name, tunnel->debug);
1422                 break;
1423 
1424         default:
1425                 err = -ENOPROTOOPT;
1426                 break;
1427         }
1428 
1429         return err;
1430 }
1431 
1432 /* Session getsockopt helper. Called with sock locked.
1433  */
1434 static int pppol2tp_session_getsockopt(struct sock *sk,
1435                                        struct l2tp_session *session,
1436                                        int optname, int *val)
1437 {
1438         int err = 0;
1439 
1440         switch (optname) {
1441         case PPPOL2TP_SO_RECVSEQ:
1442                 *val = session->recv_seq;
1443                 l2tp_info(session, L2TP_MSG_CONTROL,
1444                           "%s: get recv_seq=%d\n", session->name, *val);
1445                 break;
1446 
1447         case PPPOL2TP_SO_SENDSEQ:
1448                 *val = session->send_seq;
1449                 l2tp_info(session, L2TP_MSG_CONTROL,
1450                           "%s: get send_seq=%d\n", session->name, *val);
1451                 break;
1452 
1453         case PPPOL2TP_SO_LNSMODE:
1454                 *val = session->lns_mode;
1455                 l2tp_info(session, L2TP_MSG_CONTROL,
1456                           "%s: get lns_mode=%d\n", session->name, *val);
1457                 break;
1458 
1459         case PPPOL2TP_SO_DEBUG:
1460                 *val = session->debug;
1461                 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1462                           session->name, *val);
1463                 break;
1464 
1465         case PPPOL2TP_SO_REORDERTO:
1466                 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1467                 l2tp_info(session, L2TP_MSG_CONTROL,
1468                           "%s: get reorder_timeout=%d\n", session->name, *val);
1469                 break;
1470 
1471         default:
1472                 err = -ENOPROTOOPT;
1473         }
1474 
1475         return err;
1476 }
1477 
1478 /* Main getsockopt() entry point.
1479  * Does API checks, then calls either the tunnel or session getsockopt
1480  * handler, according to whether the PPPoX socket is a for a regular session
1481  * or the special tunnel type.
1482  */
1483 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1484                                char __user *optval, int __user *optlen)
1485 {
1486         struct sock *sk = sock->sk;
1487         struct l2tp_session *session;
1488         struct l2tp_tunnel *tunnel;
1489         int val, len;
1490         int err;
1491 
1492         if (level != SOL_PPPOL2TP)
1493                 return -EINVAL;
1494 
1495         if (get_user(len, optlen))
1496                 return -EFAULT;
1497 
1498         len = min_t(unsigned int, len, sizeof(int));
1499 
1500         if (len < 0)
1501                 return -EINVAL;
1502 
1503         err = -ENOTCONN;
1504         if (sk->sk_user_data == NULL)
1505                 goto end;
1506 
1507         /* Get the session context */
1508         err = -EBADF;
1509         session = pppol2tp_sock_to_session(sk);
1510         if (session == NULL)
1511                 goto end;
1512 
1513         /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1514         if ((session->session_id == 0) &&
1515             (session->peer_session_id == 0)) {
1516                 tunnel = session->tunnel;
1517                 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1518                 if (err)
1519                         goto end_put_sess;
1520         } else {
1521                 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1522                 if (err)
1523                         goto end_put_sess;
1524         }
1525 
1526         err = -EFAULT;
1527         if (put_user(len, optlen))
1528                 goto end_put_sess;
1529 
1530         if (copy_to_user((void __user *) optval, &val, len))
1531                 goto end_put_sess;
1532 
1533         err = 0;
1534 
1535 end_put_sess:
1536         sock_put(sk);
1537 end:
1538         return err;
1539 }
1540 
1541 /*****************************************************************************
1542  * /proc filesystem for debug
1543  * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1544  * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1545  *****************************************************************************/
1546 
1547 static unsigned int pppol2tp_net_id;
1548 
1549 #ifdef CONFIG_PROC_FS
1550 
1551 struct pppol2tp_seq_data {
1552         struct seq_net_private p;
1553         int tunnel_idx;                 /* current tunnel */
1554         int session_idx;                /* index of session within current tunnel */
1555         struct l2tp_tunnel *tunnel;
1556         struct l2tp_session *session;   /* NULL means get next tunnel */
1557 };
1558 
1559 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1560 {
1561         /* Drop reference taken during previous invocation */
1562         if (pd->tunnel)
1563                 l2tp_tunnel_dec_refcount(pd->tunnel);
1564 
1565         for (;;) {
1566                 pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx);
1567                 pd->tunnel_idx++;
1568 
1569                 /* Only accept L2TPv2 tunnels */
1570                 if (!pd->tunnel || pd->tunnel->version == 2)
1571                         return;
1572 
1573                 l2tp_tunnel_dec_refcount(pd->tunnel);
1574         }
1575 }
1576 
1577 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1578 {
1579         pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
1580         pd->session_idx++;
1581 
1582         if (pd->session == NULL) {
1583                 pd->session_idx = 0;
1584                 pppol2tp_next_tunnel(net, pd);
1585         }
1586 }
1587 
1588 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1589 {
1590         struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1591         loff_t pos = *offs;
1592         struct net *net;
1593 
1594         if (!pos)
1595                 goto out;
1596 
1597         BUG_ON(m->private == NULL);
1598         pd = m->private;
1599         net = seq_file_net(m);
1600 
1601         if (pd->tunnel == NULL)
1602                 pppol2tp_next_tunnel(net, pd);
1603         else
1604                 pppol2tp_next_session(net, pd);
1605 
1606         /* NULL tunnel and session indicates end of list */
1607         if ((pd->tunnel == NULL) && (pd->session == NULL))
1608                 pd = NULL;
1609 
1610 out:
1611         return pd;
1612 }
1613 
1614 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1615 {
1616         (*pos)++;
1617         return NULL;
1618 }
1619 
1620 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1621 {
1622         struct pppol2tp_seq_data *pd = v;
1623 
1624         if (!pd || pd == SEQ_START_TOKEN)
1625                 return;
1626 
1627         /* Drop reference taken by last invocation of pppol2tp_next_tunnel() */
1628         if (pd->tunnel) {
1629                 l2tp_tunnel_dec_refcount(pd->tunnel);
1630                 pd->tunnel = NULL;
1631                 pd->session = NULL;
1632         }
1633 }
1634 
1635 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1636 {
1637         struct l2tp_tunnel *tunnel = v;
1638 
1639         seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1640                    tunnel->name,
1641                    (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1642                    refcount_read(&tunnel->ref_count) - 1);
1643         seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1644                    tunnel->debug,
1645                    atomic_long_read(&tunnel->stats.tx_packets),
1646                    atomic_long_read(&tunnel->stats.tx_bytes),
1647                    atomic_long_read(&tunnel->stats.tx_errors),
1648                    atomic_long_read(&tunnel->stats.rx_packets),
1649                    atomic_long_read(&tunnel->stats.rx_bytes),
1650                    atomic_long_read(&tunnel->stats.rx_errors));
1651 }
1652 
1653 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1654 {
1655         struct l2tp_session *session = v;
1656         struct l2tp_tunnel *tunnel = session->tunnel;
1657         unsigned char state;
1658         char user_data_ok;
1659         struct sock *sk;
1660         u32 ip = 0;
1661         u16 port = 0;
1662 
1663         if (tunnel->sock) {
1664                 struct inet_sock *inet = inet_sk(tunnel->sock);
1665                 ip = ntohl(inet->inet_saddr);
1666                 port = ntohs(inet->inet_sport);
1667         }
1668 
1669         sk = pppol2tp_session_get_sock(session);
1670         if (sk) {
1671                 state = sk->sk_state;
1672                 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1673         } else {
1674                 state = 0;
1675                 user_data_ok = 'N';
1676         }
1677 
1678         seq_printf(m, "  SESSION '%s' %08X/%d %04X/%04X -> "
1679                    "%04X/%04X %d %c\n",
1680                    session->name, ip, port,
1681                    tunnel->tunnel_id,
1682                    session->session_id,
1683                    tunnel->peer_tunnel_id,
1684                    session->peer_session_id,
1685                    state, user_data_ok);
1686         seq_printf(m, "   %d/%d/%c/%c/%s %08x %u\n",
1687                    session->mtu, session->mru,
1688                    session->recv_seq ? 'R' : '-',
1689                    session->send_seq ? 'S' : '-',
1690                    session->lns_mode ? "LNS" : "LAC",
1691                    session->debug,
1692                    jiffies_to_msecs(session->reorder_timeout));
1693         seq_printf(m, "   %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1694                    session->nr, session->ns,
1695                    atomic_long_read(&session->stats.tx_packets),
1696                    atomic_long_read(&session->stats.tx_bytes),
1697                    atomic_long_read(&session->stats.tx_errors),
1698                    atomic_long_read(&session->stats.rx_packets),
1699                    atomic_long_read(&session->stats.rx_bytes),
1700                    atomic_long_read(&session->stats.rx_errors));
1701 
1702         if (sk) {
1703                 struct pppox_sock *po = pppox_sk(sk);
1704 
1705                 seq_printf(m, "   interface %s\n", ppp_dev_name(&po->chan));
1706                 sock_put(sk);
1707         }
1708 }
1709 
1710 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1711 {
1712         struct pppol2tp_seq_data *pd = v;
1713 
1714         /* display header on line 1 */
1715         if (v == SEQ_START_TOKEN) {
1716                 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1717                 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1718                 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1719                 seq_puts(m, "  SESSION name, addr/port src-tid/sid "
1720                          "dest-tid/sid state user-data-ok\n");
1721                 seq_puts(m, "   mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1722                 seq_puts(m, "   nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1723                 goto out;
1724         }
1725 
1726         /* Show the tunnel or session context.
1727          */
1728         if (!pd->session) {
1729                 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1730         } else {
1731                 pppol2tp_seq_session_show(m, pd->session);
1732                 l2tp_session_dec_refcount(pd->session);
1733         }
1734 
1735 out:
1736         return 0;
1737 }
1738 
1739 static const struct seq_operations pppol2tp_seq_ops = {
1740         .start          = pppol2tp_seq_start,
1741         .next           = pppol2tp_seq_next,
1742         .stop           = pppol2tp_seq_stop,
1743         .show           = pppol2tp_seq_show,
1744 };
1745 
1746 /* Called when our /proc file is opened. We allocate data for use when
1747  * iterating our tunnel / session contexts and store it in the private
1748  * data of the seq_file.
1749  */
1750 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1751 {
1752         return seq_open_net(inode, file, &pppol2tp_seq_ops,
1753                             sizeof(struct pppol2tp_seq_data));
1754 }
1755 
1756 static const struct file_operations pppol2tp_proc_fops = {
1757         .open           = pppol2tp_proc_open,
1758         .read           = seq_read,
1759         .llseek         = seq_lseek,
1760         .release        = seq_release_net,
1761 };
1762 
1763 #endif /* CONFIG_PROC_FS */
1764 
1765 /*****************************************************************************
1766  * Network namespace
1767  *****************************************************************************/
1768 
1769 static __net_init int pppol2tp_init_net(struct net *net)
1770 {
1771         struct proc_dir_entry *pde;
1772         int err = 0;
1773 
1774         pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1775                           &pppol2tp_proc_fops);
1776         if (!pde) {
1777                 err = -ENOMEM;
1778                 goto out;
1779         }
1780 
1781 out:
1782         return err;
1783 }
1784 
1785 static __net_exit void pppol2tp_exit_net(struct net *net)
1786 {
1787         remove_proc_entry("pppol2tp", net->proc_net);
1788 }
1789 
1790 static struct pernet_operations pppol2tp_net_ops = {
1791         .init = pppol2tp_init_net,
1792         .exit = pppol2tp_exit_net,
1793         .id   = &pppol2tp_net_id,
1794 };
1795 
1796 /*****************************************************************************
1797  * Init and cleanup
1798  *****************************************************************************/
1799 
1800 static const struct proto_ops pppol2tp_ops = {
1801         .family         = AF_PPPOX,
1802         .owner          = THIS_MODULE,
1803         .release        = pppol2tp_release,
1804         .bind           = sock_no_bind,
1805         .connect        = pppol2tp_connect,
1806         .socketpair     = sock_no_socketpair,
1807         .accept         = sock_no_accept,
1808         .getname        = pppol2tp_getname,
1809         .poll           = datagram_poll,
1810         .listen         = sock_no_listen,
1811         .shutdown       = sock_no_shutdown,
1812         .setsockopt     = pppol2tp_setsockopt,
1813         .getsockopt     = pppol2tp_getsockopt,
1814         .sendmsg        = pppol2tp_sendmsg,
1815         .recvmsg        = pppol2tp_recvmsg,
1816         .mmap           = sock_no_mmap,
1817         .ioctl          = pppox_ioctl,
1818 };
1819 
1820 static const struct pppox_proto pppol2tp_proto = {
1821         .create         = pppol2tp_create,
1822         .ioctl          = pppol2tp_ioctl,
1823         .owner          = THIS_MODULE,
1824 };
1825 
1826 #ifdef CONFIG_L2TP_V3
1827 
1828 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1829         .session_create = pppol2tp_session_create,
1830         .session_delete = l2tp_session_delete,
1831 };
1832 
1833 #endif /* CONFIG_L2TP_V3 */
1834 
1835 static int __init pppol2tp_init(void)
1836 {
1837         int err;
1838 
1839         err = register_pernet_device(&pppol2tp_net_ops);
1840         if (err)
1841                 goto out;
1842 
1843         err = proto_register(&pppol2tp_sk_proto, 0);
1844         if (err)
1845                 goto out_unregister_pppol2tp_pernet;
1846 
1847         err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1848         if (err)
1849                 goto out_unregister_pppol2tp_proto;
1850 
1851 #ifdef CONFIG_L2TP_V3
1852         err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1853         if (err)
1854                 goto out_unregister_pppox;
1855 #endif
1856 
1857         pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1858 
1859 out:
1860         return err;
1861 
1862 #ifdef CONFIG_L2TP_V3
1863 out_unregister_pppox:
1864         unregister_pppox_proto(PX_PROTO_OL2TP);
1865 #endif
1866 out_unregister_pppol2tp_proto:
1867         proto_unregister(&pppol2tp_sk_proto);
1868 out_unregister_pppol2tp_pernet:
1869         unregister_pernet_device(&pppol2tp_net_ops);
1870         goto out;
1871 }
1872 
1873 static void __exit pppol2tp_exit(void)
1874 {
1875 #ifdef CONFIG_L2TP_V3
1876         l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1877 #endif
1878         unregister_pppox_proto(PX_PROTO_OL2TP);
1879         proto_unregister(&pppol2tp_sk_proto);
1880         unregister_pernet_device(&pppol2tp_net_ops);
1881 }
1882 
1883 module_init(pppol2tp_init);
1884 module_exit(pppol2tp_exit);
1885 
1886 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1887 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1888 MODULE_LICENSE("GPL");
1889 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1890 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1891 MODULE_ALIAS_L2TP_PWTYPE(7);
1892 

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