| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| James Chapman | 4600 | 66.83% | 20 | 16.67% |
| Guillaume Nault | 1301 | 18.90% | 37 | 30.83% |
| Benjamin LaHaise | 349 | 5.07% | 3 | 2.50% |
| Shigeru Yoshida | 234 | 3.40% | 1 | 0.83% |
| Tom Parkin | 162 | 2.35% | 11 | 9.17% |
| Cyrill V. Gorcunov | 50 | 0.73% | 3 | 2.50% |
| Eric Dumazet | 50 | 0.73% | 5 | 4.17% |
| Gao Feng | 23 | 0.33% | 4 | 3.33% |
| Eric W. Biedermann | 19 | 0.28% | 3 | 2.50% |
| Arnd Bergmann | 15 | 0.22% | 2 | 1.67% |
| Stephen Hemminger | 9 | 0.13% | 2 | 1.67% |
| Joe Perches | 9 | 0.13% | 2 | 1.67% |
| Jakub Kiciński | 7 | 0.10% | 1 | 0.83% |
| Asbjörn Sloth Tönnesen | 6 | 0.09% | 1 | 0.83% |
| Wei Yongjun | 6 | 0.09% | 1 | 0.83% |
| Alexey Dobriyan | 5 | 0.07% | 2 | 1.67% |
| Chas Williams | 5 | 0.07% | 1 | 0.83% |
| David S. Miller | 4 | 0.06% | 3 | 2.50% |
| Christoph Hellwig | 4 | 0.06% | 2 | 1.67% |
| Sasha Levin | 4 | 0.06% | 1 | 0.83% |
| Phil Turnbull | 3 | 0.04% | 1 | 0.83% |
| Julia Lawall | 2 | 0.03% | 1 | 0.83% |
| Thomas Gleixner | 2 | 0.03% | 1 | 0.83% |
| Linus Torvalds | 2 | 0.03% | 1 | 0.83% |
| Frédéric Moulins | 2 | 0.03% | 1 | 0.83% |
| Elena Reshetova | 1 | 0.01% | 1 | 0.83% |
| Javier Martinez Canillas | 1 | 0.01% | 1 | 0.83% |
| Denys Vlasenko | 1 | 0.01% | 1 | 0.83% |
| Paul Mackerras | 1 | 0.01% | 1 | 0.83% |
| Arun Sharma | 1 | 0.01% | 1 | 0.83% |
| Jan Engelhardt | 1 | 0.01% | 1 | 0.83% |
| Denis V. Lunev | 1 | 0.01% | 1 | 0.83% |
| Justin Stitt | 1 | 0.01% | 1 | 0.83% |
| Al Viro | 1 | 0.01% | 1 | 0.83% |
| Zheng Yongjun | 1 | 0.01% | 1 | 0.83% |
| Total | 6883 | 120 |
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// SPDX-License-Identifier: GPL-2.0-or-later /***************************************************************************** * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets * * PPPoX --- Generic PPP encapsulation socket family * PPPoL2TP --- PPP over L2TP (RFC 2661) * * Version: 2.0.0 * * Authors: James Chapman (jchapman@katalix.com) * * Based on original work by Martijn van Oosterhout <kleptog@svana.org> * * License: */ /* This driver handles only L2TP data frames; control frames are handled by a * userspace application. * * To send data in an L2TP session, userspace opens a PPPoL2TP socket and * attaches it to a bound UDP socket with local tunnel_id / session_id and * peer tunnel_id / session_id set. Data can then be sent or received using * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket * can be read or modified using ioctl() or [gs]etsockopt() calls. * * When a PPPoL2TP socket is connected with local and peer session_id values * zero, the socket is treated as a special tunnel management socket. * * Here's example userspace code to create a socket for sending/receiving data * over an L2TP session:- * * struct sockaddr_pppol2tp sax; * int fd; * int session_fd; * * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP); * * sax.sa_family = AF_PPPOX; * sax.sa_protocol = PX_PROTO_OL2TP; * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr; * sax.pppol2tp.addr.sin_port = addr->sin_port; * sax.pppol2tp.addr.sin_family = AF_INET; * sax.pppol2tp.s_tunnel = tunnel_id; * sax.pppol2tp.s_session = session_id; * sax.pppol2tp.d_tunnel = peer_tunnel_id; * sax.pppol2tp.d_session = peer_session_id; * * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax)); * * A pppd plugin that allows PPP traffic to be carried over L2TP using * this driver is available from the OpenL2TP project at * http://openl2tp.sourceforge.net. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/string.h> #include <linux/list.h> #include <linux/uaccess.h> #include <linux/kernel.h> #include <linux/spinlock.h> #include <linux/kthread.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/jiffies.h> #include <linux/netdevice.h> #include <linux/net.h> #include <linux/inetdevice.h> #include <linux/skbuff.h> #include <linux/init.h> #include <linux/ip.h> #include <linux/udp.h> #include <linux/if_pppox.h> #include <linux/if_pppol2tp.h> #include <net/sock.h> #include <linux/ppp_channel.h> #include <linux/ppp_defs.h> #include <linux/ppp-ioctl.h> #include <linux/file.h> #include <linux/hash.h> #include <linux/sort.h> #include <linux/proc_fs.h> #include <linux/l2tp.h> #include <linux/nsproxy.h> #include <net/net_namespace.h> #include <net/netns/generic.h> #include <net/ip.h> #include <net/udp.h> #include <net/inet_common.h> #include <asm/byteorder.h> #include <linux/atomic.h> #include "l2tp_core.h" #define PPPOL2TP_DRV_VERSION "V2.0" /* Space for UDP, L2TP and PPP headers */ #define PPPOL2TP_HEADER_OVERHEAD 40 /* Number of bytes to build transmit L2TP headers. * Unfortunately the size is different depending on whether sequence numbers * are enabled. */ #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 /* Private data of each session. This data lives at the end of struct * l2tp_session, referenced via session->priv[]. */ struct pppol2tp_session { int owner; /* pid that opened the socket */ struct mutex sk_lock; /* Protects .sk */ struct sock __rcu *sk; /* Pointer to the session PPPoX socket */ struct sock *__sk; /* Copy of .sk, for cleanup */ }; static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); static const struct ppp_channel_ops pppol2tp_chan_ops = { .start_xmit = pppol2tp_xmit, }; static const struct proto_ops pppol2tp_ops; /* Retrieves the pppol2tp socket associated to a session. * A reference is held on the returned socket, so this function must be paired * with sock_put(). */ static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session) { struct pppol2tp_session *ps = l2tp_session_priv(session); struct sock *sk; rcu_read_lock(); sk = rcu_dereference(ps->sk); if (sk) sock_hold(sk); rcu_read_unlock(); return sk; } /* Helpers to obtain tunnel/session contexts from sockets. */ static struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) { struct l2tp_session *session; if (!sk) return NULL; rcu_read_lock(); session = rcu_dereference_sk_user_data(sk); if (session && refcount_inc_not_zero(&session->ref_count)) { rcu_read_unlock(); WARN_ON_ONCE(session->magic != L2TP_SESSION_MAGIC); return session; } rcu_read_unlock(); return NULL; } /***************************************************************************** * Receive data handling *****************************************************************************/ /* Receive message. This is the recvmsg for the PPPoL2TP socket. */ static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, int flags) { int err; struct sk_buff *skb; struct sock *sk = sock->sk; err = -EIO; if (sk->sk_state & PPPOX_BOUND) goto end; err = 0; skb = skb_recv_datagram(sk, flags, &err); if (!skb) goto end; if (len > skb->len) len = skb->len; else if (len < skb->len) msg->msg_flags |= MSG_TRUNC; err = skb_copy_datagram_msg(skb, 0, msg, len); if (likely(err == 0)) err = len; kfree_skb(skb); end: return err; } static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) { struct pppol2tp_session *ps = l2tp_session_priv(session); struct sock *sk = NULL; /* If the socket is bound, send it in to PPP's input queue. Otherwise * queue it on the session socket. */ rcu_read_lock(); sk = rcu_dereference(ps->sk); if (!sk) goto no_sock; /* If the first two bytes are 0xFF03, consider that it is the PPP's * Address and Control fields and skip them. The L2TP module has always * worked this way, although, in theory, the use of these fields should * be negotiated and handled at the PPP layer. These fields are * constant: 0xFF is the All-Stations Address and 0x03 the Unnumbered * Information command with Poll/Final bit set to zero (RFC 1662). */ if (pskb_may_pull(skb, 2) && skb->data[0] == PPP_ALLSTATIONS && skb->data[1] == PPP_UI) skb_pull(skb, 2); if (sk->sk_state & PPPOX_BOUND) { struct pppox_sock *po; po = pppox_sk(sk); ppp_input(&po->chan, skb); } else { if (sock_queue_rcv_skb(sk, skb) < 0) { atomic_long_inc(&session->stats.rx_errors); kfree_skb(skb); } } rcu_read_unlock(); return; no_sock: rcu_read_unlock(); pr_warn_ratelimited("%s: no socket in recv\n", session->name); kfree_skb(skb); } /************************************************************************ * Transmit handling ***********************************************************************/ /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here * when a user application does a sendmsg() on the session socket. L2TP and * PPP headers must be inserted into the user's data. */ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) { struct sock *sk = sock->sk; struct sk_buff *skb; int error; struct l2tp_session *session; struct l2tp_tunnel *tunnel; int uhlen; error = -ENOTCONN; if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) goto error; /* Get session and tunnel contexts */ error = -EBADF; session = pppol2tp_sock_to_session(sk); if (!session) goto error; tunnel = session->tunnel; uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; /* Allocate a socket buffer */ error = -ENOMEM; skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + uhlen + session->hdr_len + 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ 0, GFP_KERNEL); if (!skb) goto error_put_sess; /* Reserve space for headers. */ skb_reserve(skb, NET_SKB_PAD); skb_reset_network_header(skb); skb_reserve(skb, sizeof(struct iphdr)); skb_reset_transport_header(skb); skb_reserve(skb, uhlen); /* Add PPP header */ skb->data[0] = PPP_ALLSTATIONS; skb->data[1] = PPP_UI; skb_put(skb, 2); /* Copy user data into skb */ error = memcpy_from_msg(skb_put(skb, total_len), m, total_len); if (error < 0) { kfree_skb(skb); goto error_put_sess; } local_bh_disable(); l2tp_xmit_skb(session, skb); local_bh_enable(); l2tp_session_put(session); return total_len; error_put_sess: l2tp_session_put(session); error: return error; } /* Transmit function called by generic PPP driver. Sends PPP frame * over PPPoL2TP socket. * * This is almost the same as pppol2tp_sendmsg(), but rather than * being called with a msghdr from userspace, it is called with a skb * from the kernel. * * The supplied skb from ppp doesn't have enough headroom for the * insertion of L2TP, UDP and IP headers so we need to allocate more * headroom in the skb. This will create a cloned skb. But we must be * careful in the error case because the caller will expect to free * the skb it supplied, not our cloned skb. So we take care to always * leave the original skb unfreed if we return an error. */ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) { struct sock *sk = (struct sock *)chan->private; struct l2tp_session *session; struct l2tp_tunnel *tunnel; int uhlen, headroom; if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) goto abort; /* Get session and tunnel contexts from the socket */ session = pppol2tp_sock_to_session(sk); if (!session) goto abort; tunnel = session->tunnel; uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; headroom = NET_SKB_PAD + sizeof(struct iphdr) + /* IP header */ uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ session->hdr_len + /* L2TP header */ 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ if (skb_cow_head(skb, headroom)) goto abort_put_sess; /* Setup PPP header */ __skb_push(skb, 2); skb->data[0] = PPP_ALLSTATIONS; skb->data[1] = PPP_UI; local_bh_disable(); l2tp_xmit_skb(session, skb); local_bh_enable(); l2tp_session_put(session); return 1; abort_put_sess: l2tp_session_put(session); abort: /* Free the original skb */ kfree_skb(skb); return 1; } /***************************************************************************** * Session (and tunnel control) socket create/destroy. *****************************************************************************/ /* Really kill the session socket. (Called from sock_put() if * refcnt == 0.) */ static void pppol2tp_session_destruct(struct sock *sk) { skb_queue_purge(&sk->sk_receive_queue); skb_queue_purge(&sk->sk_write_queue); } static void pppol2tp_session_close(struct l2tp_session *session) { struct pppol2tp_session *ps; 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); if (ps->__sk) { /* detach socket */ rcu_assign_sk_user_data(ps->__sk, NULL); sock_put(ps->__sk); /* drop ref taken when we referenced socket via sk_user_data */ l2tp_session_put(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) { l2tp_session_delete(session); /* drop ref taken by pppol2tp_sock_to_session */ l2tp_session_put(session); } release_sock(sk); 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_set_flag(sk, SOCK_RCU_FREE); 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; session->session_close = pppol2tp_session_close; 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; } static struct l2tp_tunnel *pppol2tp_tunnel_get(struct net *net, const struct l2tp_connect_info *info, bool *new_tunnel) { struct l2tp_tunnel *tunnel; int error; *new_tunnel = false; tunnel = l2tp_tunnel_get(net, info->tunnel_id); /* 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) return ERR_PTR(-EBADF); error = l2tp_tunnel_create(info->fd, info->version, info->tunnel_id, info->peer_tunnel_id, &tcfg, &tunnel); if (error < 0) return ERR_PTR(error); refcount_inc(&tunnel->ref_count); error = l2tp_tunnel_register(tunnel, net, &tcfg); if (error < 0) { kfree(tunnel); return ERR_PTR(error); } *new_tunnel = true; } } else { /* Error if we can't find the tunnel */ if (!tunnel) return ERR_PTR(-ENOENT); /* Error if socket is not prepped */ if (!tunnel->sock) { l2tp_tunnel_put(tunnel); return ERR_PTR(-ENOENT); } } return tunnel; } /* 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 new_session = false; bool new_tunnel = false; int error; error = pppol2tp_sockaddr_get_info(uservaddr, sockaddr_len, &info); if (error < 0) return error; /* Don't bind if tunnel_id is 0 */ if (!info.tunnel_id) return -EINVAL; tunnel = pppol2tp_tunnel_get(sock_net(sk), &info, &new_tunnel); if (IS_ERR(tunnel)) return PTR_ERR(tunnel); 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 */ if (tunnel->peer_tunnel_id == 0) tunnel->peer_tunnel_id = info.peer_tunnel_id; session = l2tp_session_get(sock_net(sk), tunnel->sock, tunnel->version, info.tunnel_id, 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; } drop_refcnt = true; pppol2tp_session_init(session); ps = l2tp_session_priv(session); refcount_inc(&session->ref_count); mutex_lock(&ps->sk_lock); error = l2tp_session_register(session, tunnel); if (error < 0) { mutex_unlock(&ps->sk_lock); l2tp_session_put(session); goto end; } 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. */ sock_hold(sk); rcu_assign_sk_user_data(sk, 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_close() 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_put(session); l2tp_tunnel_put(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: l2tp_session_put(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; l2tp_session_put(session); 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_session_get(tunnel->l2tp_net, tunnel->sock, tunnel->version, tunnel->tunnel_id, stats->session_id); if (!session) return -EBADR; if (session->pwtype != L2TP_PWTYPE_PPP) { l2tp_session_put(session); return -EBADR; } pppol2tp_copy_stats(stats, &session->stats); l2tp_session_put(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, session->tunnel->encap); 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); } l2tp_session_put(session); 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; if (len < 0) return -EINVAL; len = min_t(unsigned int, len, sizeof(int)); 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: l2tp_session_put(session); 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. *****************************************************************************/ #ifdef CONFIG_PROC_FS struct pppol2tp_seq_data { struct seq_net_private p; unsigned long tkey; /* lookup key of current tunnel */ unsigned long skey; /* lookup key of current session */ 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_put(pd->tunnel); for (;;) { pd->tunnel = l2tp_tunnel_get_next(net, &pd->tkey); pd->tkey++; /* Only accept L2TPv2 tunnels */ if (!pd->tunnel || pd->tunnel->version == 2) return; l2tp_tunnel_put(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_put(pd->session); pd->session = l2tp_session_get_next(net, pd->tunnel->sock, pd->tunnel->version, pd->tunnel->tunnel_id, &pd->skey); pd->skey++; if (!pd->session) { pd->skey = 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_put(pd->session); pd->session = NULL; } if (pd->tunnel) { l2tp_tunnel_put(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->sock ? '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, " %u/%u %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, }; /***************************************************************************** * 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);
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