zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/Kconfig b/ap/os/linux/linux-3.4.x/net/l2tp/Kconfig
new file mode 100644
index 0000000..4b1e717
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/Kconfig
@@ -0,0 +1,107 @@
+#
+# Layer Two Tunneling Protocol (L2TP)
+#
+
+menuconfig L2TP
+ tristate "Layer Two Tunneling Protocol (L2TP)"
+ depends on INET
+ ---help---
+ Layer Two Tunneling Protocol
+
+ From RFC 2661 <http://www.ietf.org/rfc/rfc2661.txt>.
+
+ L2TP facilitates the tunneling of packets across an
+ intervening network in a way that is as transparent as
+ possible to both end-users and applications.
+
+ L2TP is often used to tunnel PPP traffic over IP
+ tunnels. One IP tunnel may carry thousands of individual PPP
+ connections. L2TP is also used as a VPN protocol, popular
+ with home workers to connect to their offices.
+
+ L2TPv3 allows other protocols as well as PPP to be carried
+ over L2TP tunnels. L2TPv3 is defined in RFC 3931
+ <http://www.ietf.org/rfc/rfc3931.txt>.
+
+ The kernel component handles only L2TP data packets: a
+ userland daemon handles L2TP the control protocol (tunnel
+ and session setup). One such daemon is OpenL2TP
+ (http://openl2tp.org/).
+
+ If you don't need L2TP, say N. To compile all L2TP code as
+ modules, choose M here.
+
+config L2TP_DEBUGFS
+ tristate "L2TP debugfs support"
+ depends on L2TP && DEBUG_FS
+ help
+ Support for l2tp directory in debugfs filesystem. This may be
+ used to dump internal state of the l2tp drivers for problem
+ analysis.
+
+ If unsure, say 'Y'.
+
+ To compile this driver as a module, choose M here. The module
+ will be called l2tp_debugfs.
+
+config L2TP_V3
+ bool "L2TPv3 support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && L2TP
+ help
+ Layer Two Tunneling Protocol Version 3
+
+ From RFC 3931 <http://www.ietf.org/rfc/rfc3931.txt>.
+
+ The Layer Two Tunneling Protocol (L2TP) provides a dynamic
+ mechanism for tunneling Layer 2 (L2) "circuits" across a
+ packet-oriented data network (e.g., over IP). L2TP, as
+ originally defined in RFC 2661, is a standard method for
+ tunneling Point-to-Point Protocol (PPP) [RFC1661] sessions.
+ L2TP has since been adopted for tunneling a number of other
+ L2 protocols, including ATM, Frame Relay, HDLC and even raw
+ ethernet frames.
+
+ If you are connecting to L2TPv3 equipment, or you want to
+ tunnel raw ethernet frames using L2TP, say Y here. If
+ unsure, say N.
+
+config L2TP_IP
+ tristate "L2TP IP encapsulation for L2TPv3"
+ depends on L2TP_V3
+ help
+ Support for L2TP-over-IP socket family.
+
+ The L2TPv3 protocol defines two possible encapsulations for
+ L2TP frames, namely UDP and plain IP (without UDP). This
+ driver provides a new L2TPIP socket family with which
+ userspace L2TPv3 daemons may create L2TP/IP tunnel sockets
+ when UDP encapsulation is not required. When L2TP is carried
+ in IP packets, it used IP protocol number 115, so this port
+ must be enabled in firewalls.
+
+ To compile this driver as a module, choose M here. The module
+ will be called l2tp_ip.
+
+config L2TP_ETH
+ tristate "L2TP ethernet pseudowire support for L2TPv3"
+ depends on L2TP_V3
+ help
+ Support for carrying raw ethernet frames over L2TPv3.
+
+ From RFC 4719 <http://www.ietf.org/rfc/rfc4719.txt>.
+
+ The Layer 2 Tunneling Protocol, Version 3 (L2TPv3) can be
+ used as a control protocol and for data encapsulation to set
+ up Pseudowires for transporting layer 2 Packet Data Units
+ across an IP network [RFC3931].
+
+ This driver provides an ethernet virtual interface for each
+ L2TP ethernet pseudowire instance. Standard Linux tools may
+ be used to assign an IP address to the local virtual
+ interface, or add the interface to a bridge.
+
+ If you are using L2TPv3, you will almost certainly want to
+ enable this option.
+
+ To compile this driver as a module, choose M here. The module
+ will be called l2tp_eth.
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/Makefile b/ap/os/linux/linux-3.4.x/net/l2tp/Makefile
new file mode 100644
index 0000000..110e7bc
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/Makefile
@@ -0,0 +1,12 @@
+#
+# Makefile for the L2TP.
+#
+
+obj-$(CONFIG_L2TP) += l2tp_core.o
+
+# Build l2tp as modules if L2TP is M
+obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_PPPOL2TP)) += l2tp_ppp.o
+obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_IP)) += l2tp_ip.o
+obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_V3)) += l2tp_netlink.o
+obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_ETH)) += l2tp_eth.o
+obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_DEBUGFS)) += l2tp_debugfs.o
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_core.c b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_core.c
new file mode 100644
index 0000000..7501b22
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_core.c
@@ -0,0 +1,1703 @@
+/*
+ * L2TP core.
+ *
+ * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
+ *
+ * This file contains some code of the original L2TPv2 pppol2tp
+ * driver, which has the following copyright:
+ *
+ * Authors: Martijn van Oosterhout <kleptog@svana.org>
+ * James Chapman (jchapman@katalix.com)
+ * Contributors:
+ * Michal Ostrowski <mostrows@speakeasy.net>
+ * Arnaldo Carvalho de Melo <acme@xconectiva.com.br>
+ * David S. Miller (davem@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <linux/rculist.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/in.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/l2tp.h>
+#include <linux/hash.h>
+#include <linux/sort.h>
+#include <linux/file.h>
+#include <linux/nsproxy.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/dst.h>
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/inet_common.h>
+#include <net/xfrm.h>
+#include <net/protocol.h>
+
+#include <asm/byteorder.h>
+#include <linux/atomic.h>
+
+#include "l2tp_core.h"
+
+#define L2TP_DRV_VERSION "V2.0"
+
+/* L2TP header constants */
+#define L2TP_HDRFLAG_T 0x8000
+#define L2TP_HDRFLAG_L 0x4000
+#define L2TP_HDRFLAG_S 0x0800
+#define L2TP_HDRFLAG_O 0x0200
+#define L2TP_HDRFLAG_P 0x0100
+
+#define L2TP_HDR_VER_MASK 0x000F
+#define L2TP_HDR_VER_2 0x0002
+#define L2TP_HDR_VER_3 0x0003
+
+/* L2TPv3 default L2-specific sublayer */
+#define L2TP_SLFLAG_S 0x40000000
+#define L2TP_SL_SEQ_MASK 0x00ffffff
+
+#define L2TP_HDR_SIZE_SEQ 10
+#define L2TP_HDR_SIZE_NOSEQ 6
+
+/* Default trace flags */
+#define L2TP_DEFAULT_DEBUG_FLAGS 0
+
+#define PRINTK(_mask, _type, _lvl, _fmt, args...) \
+ do { \
+ if ((_mask) & (_type)) \
+ printk(_lvl "L2TP: " _fmt, ##args); \
+ } while (0)
+
+/* Private data stored for received packets in the skb.
+ */
+struct l2tp_skb_cb {
+ u32 ns;
+ u16 has_seq;
+ u16 length;
+ unsigned long expires;
+};
+
+#define L2TP_SKB_CB(skb) ((struct l2tp_skb_cb *) &skb->cb[sizeof(struct inet_skb_parm)])
+
+static atomic_t l2tp_tunnel_count;
+static atomic_t l2tp_session_count;
+
+/* per-net private data for this module */
+static unsigned int l2tp_net_id;
+struct l2tp_net {
+ struct list_head l2tp_tunnel_list;
+ spinlock_t l2tp_tunnel_list_lock;
+ struct hlist_head l2tp_session_hlist[L2TP_HASH_SIZE_2];
+ spinlock_t l2tp_session_hlist_lock;
+};
+
+static void l2tp_session_set_header_len(struct l2tp_session *session, int version);
+static void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
+static void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
+
+static inline struct l2tp_net *l2tp_pernet(struct net *net)
+{
+ BUG_ON(!net);
+
+ return net_generic(net, l2tp_net_id);
+}
+
+
+/* Tunnel reference counts. Incremented per session that is added to
+ * the tunnel.
+ */
+static inline void l2tp_tunnel_inc_refcount_1(struct l2tp_tunnel *tunnel)
+{
+ atomic_inc(&tunnel->ref_count);
+}
+
+static inline void l2tp_tunnel_dec_refcount_1(struct l2tp_tunnel *tunnel)
+{
+ if (atomic_dec_and_test(&tunnel->ref_count))
+ l2tp_tunnel_free(tunnel);
+}
+#ifdef L2TP_REFCNT_DEBUG
+#define l2tp_tunnel_inc_refcount(_t) do { \
+ printk(KERN_DEBUG "l2tp_tunnel_inc_refcount: %s:%d %s: cnt=%d\n", __func__, __LINE__, (_t)->name, atomic_read(&_t->ref_count)); \
+ l2tp_tunnel_inc_refcount_1(_t); \
+ } while (0)
+#define l2tp_tunnel_dec_refcount(_t) do { \
+ printk(KERN_DEBUG "l2tp_tunnel_dec_refcount: %s:%d %s: cnt=%d\n", __func__, __LINE__, (_t)->name, atomic_read(&_t->ref_count)); \
+ l2tp_tunnel_dec_refcount_1(_t); \
+ } while (0)
+#else
+#define l2tp_tunnel_inc_refcount(t) l2tp_tunnel_inc_refcount_1(t)
+#define l2tp_tunnel_dec_refcount(t) l2tp_tunnel_dec_refcount_1(t)
+#endif
+
+/* Session hash global list for L2TPv3.
+ * The session_id SHOULD be random according to RFC3931, but several
+ * L2TP implementations use incrementing session_ids. So we do a real
+ * hash on the session_id, rather than a simple bitmask.
+ */
+static inline struct hlist_head *
+l2tp_session_id_hash_2(struct l2tp_net *pn, u32 session_id)
+{
+ return &pn->l2tp_session_hlist[hash_32(session_id, L2TP_HASH_BITS_2)];
+
+}
+
+/* Lookup a session by id in the global session list
+ */
+static struct l2tp_session *l2tp_session_find_2(struct net *net, u32 session_id)
+{
+ struct l2tp_net *pn = l2tp_pernet(net);
+ struct hlist_head *session_list =
+ l2tp_session_id_hash_2(pn, session_id);
+ struct l2tp_session *session;
+ struct hlist_node *walk;
+
+ rcu_read_lock_bh();
+ hlist_for_each_entry_rcu(session, walk, session_list, global_hlist) {
+ if (session->session_id == session_id) {
+ rcu_read_unlock_bh();
+ return session;
+ }
+ }
+ rcu_read_unlock_bh();
+
+ return NULL;
+}
+
+/* Session hash list.
+ * The session_id SHOULD be random according to RFC2661, but several
+ * L2TP implementations (Cisco and Microsoft) use incrementing
+ * session_ids. So we do a real hash on the session_id, rather than a
+ * simple bitmask.
+ */
+static inline struct hlist_head *
+l2tp_session_id_hash(struct l2tp_tunnel *tunnel, u32 session_id)
+{
+ return &tunnel->session_hlist[hash_32(session_id, L2TP_HASH_BITS)];
+}
+
+/* Lookup a session by id
+ */
+struct l2tp_session *l2tp_session_find(struct net *net, struct l2tp_tunnel *tunnel, u32 session_id)
+{
+ struct hlist_head *session_list;
+ struct l2tp_session *session;
+ struct hlist_node *walk;
+
+ /* In L2TPv3, session_ids are unique over all tunnels and we
+ * sometimes need to look them up before we know the
+ * tunnel.
+ */
+ if (tunnel == NULL)
+ return l2tp_session_find_2(net, session_id);
+
+ session_list = l2tp_session_id_hash(tunnel, session_id);
+ read_lock_bh(&tunnel->hlist_lock);
+ hlist_for_each_entry(session, walk, session_list, hlist) {
+ if (session->session_id == session_id) {
+ read_unlock_bh(&tunnel->hlist_lock);
+ return session;
+ }
+ }
+ read_unlock_bh(&tunnel->hlist_lock);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(l2tp_session_find);
+
+struct l2tp_session *l2tp_session_find_nth(struct l2tp_tunnel *tunnel, int nth)
+{
+ int hash;
+ struct hlist_node *walk;
+ struct l2tp_session *session;
+ int count = 0;
+
+ read_lock_bh(&tunnel->hlist_lock);
+ for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
+ hlist_for_each_entry(session, walk, &tunnel->session_hlist[hash], hlist) {
+ if (++count > nth) {
+ read_unlock_bh(&tunnel->hlist_lock);
+ return session;
+ }
+ }
+ }
+
+ read_unlock_bh(&tunnel->hlist_lock);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(l2tp_session_find_nth);
+
+/* Lookup a session by interface name.
+ * This is very inefficient but is only used by management interfaces.
+ */
+struct l2tp_session *l2tp_session_find_by_ifname(struct net *net, char *ifname)
+{
+ struct l2tp_net *pn = l2tp_pernet(net);
+ int hash;
+ struct hlist_node *walk;
+ struct l2tp_session *session;
+
+ rcu_read_lock_bh();
+ for (hash = 0; hash < L2TP_HASH_SIZE_2; hash++) {
+ hlist_for_each_entry_rcu(session, walk, &pn->l2tp_session_hlist[hash], global_hlist) {
+ if (!strcmp(session->ifname, ifname)) {
+ rcu_read_unlock_bh();
+ return session;
+ }
+ }
+ }
+
+ rcu_read_unlock_bh();
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(l2tp_session_find_by_ifname);
+
+/* Lookup a tunnel by id
+ */
+struct l2tp_tunnel *l2tp_tunnel_find(struct net *net, u32 tunnel_id)
+{
+ struct l2tp_tunnel *tunnel;
+ struct l2tp_net *pn = l2tp_pernet(net);
+
+ rcu_read_lock_bh();
+ list_for_each_entry_rcu(tunnel, &pn->l2tp_tunnel_list, list) {
+ if (tunnel->tunnel_id == tunnel_id) {
+ rcu_read_unlock_bh();
+ return tunnel;
+ }
+ }
+ rcu_read_unlock_bh();
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(l2tp_tunnel_find);
+
+struct l2tp_tunnel *l2tp_tunnel_find_nth(struct net *net, int nth)
+{
+ struct l2tp_net *pn = l2tp_pernet(net);
+ struct l2tp_tunnel *tunnel;
+ int count = 0;
+
+ rcu_read_lock_bh();
+ list_for_each_entry_rcu(tunnel, &pn->l2tp_tunnel_list, list) {
+ if (++count > nth) {
+ rcu_read_unlock_bh();
+ return tunnel;
+ }
+ }
+
+ rcu_read_unlock_bh();
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(l2tp_tunnel_find_nth);
+
+/*****************************************************************************
+ * Receive data handling
+ *****************************************************************************/
+
+/* Queue a skb in order. We come here only if the skb has an L2TP sequence
+ * number.
+ */
+static void l2tp_recv_queue_skb(struct l2tp_session *session, struct sk_buff *skb)
+{
+ struct sk_buff *skbp;
+ struct sk_buff *tmp;
+ u32 ns = L2TP_SKB_CB(skb)->ns;
+
+ spin_lock_bh(&session->reorder_q.lock);
+ skb_queue_walk_safe(&session->reorder_q, skbp, tmp) {
+ if (L2TP_SKB_CB(skbp)->ns > ns) {
+ __skb_queue_before(&session->reorder_q, skbp, skb);
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: pkt %hu, inserted before %hu, reorder_q len=%d\n",
+ session->name, ns, L2TP_SKB_CB(skbp)->ns,
+ skb_queue_len(&session->reorder_q));
+ session->stats.rx_oos_packets++;
+ goto out;
+ }
+ }
+
+ __skb_queue_tail(&session->reorder_q, skb);
+
+out:
+ spin_unlock_bh(&session->reorder_q.lock);
+}
+
+/* Dequeue a single skb.
+ */
+static void l2tp_recv_dequeue_skb(struct l2tp_session *session, struct sk_buff *skb)
+{
+ struct l2tp_tunnel *tunnel = session->tunnel;
+ int length = L2TP_SKB_CB(skb)->length;
+
+ /* We're about to requeue the skb, so return resources
+ * to its current owner (a socket receive buffer).
+ */
+ skb_orphan(skb);
+
+ tunnel->stats.rx_packets++;
+ tunnel->stats.rx_bytes += length;
+ session->stats.rx_packets++;
+ session->stats.rx_bytes += length;
+
+ if (L2TP_SKB_CB(skb)->has_seq) {
+ /* Bump our Nr */
+ session->nr++;
+ if (tunnel->version == L2TP_HDR_VER_2)
+ session->nr &= 0xffff;
+ else
+ session->nr &= 0xffffff;
+
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: updated nr to %hu\n", session->name, session->nr);
+ }
+
+ /* call private receive handler */
+ if (session->recv_skb != NULL)
+ (*session->recv_skb)(session, skb, L2TP_SKB_CB(skb)->length);
+ else
+ kfree_skb(skb);
+
+ if (session->deref)
+ (*session->deref)(session);
+}
+
+/* Dequeue skbs from the session's reorder_q, subject to packet order.
+ * Skbs that have been in the queue for too long are simply discarded.
+ */
+static void l2tp_recv_dequeue(struct l2tp_session *session)
+{
+ struct sk_buff *skb;
+ struct sk_buff *tmp;
+
+ /* If the pkt at the head of the queue has the nr that we
+ * expect to send up next, dequeue it and any other
+ * in-sequence packets behind it.
+ */
+start:
+ spin_lock_bh(&session->reorder_q.lock);
+ skb_queue_walk_safe(&session->reorder_q, skb, tmp) {
+ if (time_after(jiffies, L2TP_SKB_CB(skb)->expires)) {
+ session->stats.rx_seq_discards++;
+ session->stats.rx_errors++;
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: oos pkt %u len %d discarded (too old), "
+ "waiting for %u, reorder_q_len=%d\n",
+ session->name, L2TP_SKB_CB(skb)->ns,
+ L2TP_SKB_CB(skb)->length, session->nr,
+ skb_queue_len(&session->reorder_q));
+ __skb_unlink(skb, &session->reorder_q);
+ kfree_skb(skb);
+ if (session->deref)
+ (*session->deref)(session);
+ continue;
+ }
+
+ if (L2TP_SKB_CB(skb)->has_seq) {
+ if (L2TP_SKB_CB(skb)->ns != session->nr) {
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: holding oos pkt %u len %d, "
+ "waiting for %u, reorder_q_len=%d\n",
+ session->name, L2TP_SKB_CB(skb)->ns,
+ L2TP_SKB_CB(skb)->length, session->nr,
+ skb_queue_len(&session->reorder_q));
+ goto out;
+ }
+ }
+ __skb_unlink(skb, &session->reorder_q);
+
+ /* Process the skb. We release the queue lock while we
+ * do so to let other contexts process the queue.
+ */
+ spin_unlock_bh(&session->reorder_q.lock);
+ l2tp_recv_dequeue_skb(session, skb);
+ goto start;
+ }
+
+out:
+ spin_unlock_bh(&session->reorder_q.lock);
+}
+
+static inline int l2tp_verify_udp_checksum(struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct udphdr *uh = udp_hdr(skb);
+ u16 ulen = ntohs(uh->len);
+ struct inet_sock *inet;
+ __wsum psum;
+
+ if (sk->sk_no_check || skb_csum_unnecessary(skb) || !uh->check)
+ return 0;
+
+ inet = inet_sk(sk);
+ psum = csum_tcpudp_nofold(inet->inet_saddr, inet->inet_daddr, ulen,
+ IPPROTO_UDP, 0);
+
+ if ((skb->ip_summed == CHECKSUM_COMPLETE) &&
+ !csum_fold(csum_add(psum, skb->csum)))
+ return 0;
+
+ skb->csum = psum;
+
+ return __skb_checksum_complete(skb);
+}
+
+/* Do receive processing of L2TP data frames. We handle both L2TPv2
+ * and L2TPv3 data frames here.
+ *
+ * L2TPv2 Data Message Header
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |T|L|x|x|S|x|O|P|x|x|x|x| Ver | Length (opt) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Tunnel ID | Session ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ns (opt) | Nr (opt) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Offset Size (opt) | Offset pad... (opt)
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Data frames are marked by T=0. All other fields are the same as
+ * those in L2TP control frames.
+ *
+ * L2TPv3 Data Message Header
+ *
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | L2TP Session Header |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | L2-Specific Sublayer |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Tunnel Payload ...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * L2TPv3 Session Header Over IP
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Session ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Cookie (optional, maximum 64 bits)...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * L2TPv3 L2-Specific Sublayer Format
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |x|S|x|x|x|x|x|x| Sequence Number |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Cookie value, sublayer format and offset (pad) are negotiated with
+ * the peer when the session is set up. Unlike L2TPv2, we do not need
+ * to parse the packet header to determine if optional fields are
+ * present.
+ *
+ * Caller must already have parsed the frame and determined that it is
+ * a data (not control) frame before coming here. Fields up to the
+ * session-id have already been parsed and ptr points to the data
+ * after the session-id.
+ */
+void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
+ unsigned char *ptr, unsigned char *optr, u16 hdrflags,
+ int length, int (*payload_hook)(struct sk_buff *skb))
+{
+ struct l2tp_tunnel *tunnel = session->tunnel;
+ int offset;
+ u32 ns, nr;
+
+ /* The ref count is increased since we now hold a pointer to
+ * the session. Take care to decrement the refcnt when exiting
+ * this function from now on...
+ */
+ l2tp_session_inc_refcount(session);
+ if (session->ref)
+ (*session->ref)(session);
+
+ /* Parse and check optional cookie */
+ if (session->peer_cookie_len > 0) {
+ if (memcmp(ptr, &session->peer_cookie[0], session->peer_cookie_len)) {
+ PRINTK(tunnel->debug, L2TP_MSG_DATA, KERN_INFO,
+ "%s: cookie mismatch (%u/%u). Discarding.\n",
+ tunnel->name, tunnel->tunnel_id, session->session_id);
+ session->stats.rx_cookie_discards++;
+ goto discard;
+ }
+ ptr += session->peer_cookie_len;
+ }
+
+ /* Handle the optional sequence numbers. Sequence numbers are
+ * in different places for L2TPv2 and L2TPv3.
+ *
+ * If we are the LAC, enable/disable sequence numbers under
+ * the control of the LNS. If no sequence numbers present but
+ * we were expecting them, discard frame.
+ */
+ ns = nr = 0;
+ L2TP_SKB_CB(skb)->has_seq = 0;
+ if (tunnel->version == L2TP_HDR_VER_2) {
+ if (hdrflags & L2TP_HDRFLAG_S) {
+ ns = ntohs(*(__be16 *) ptr);
+ ptr += 2;
+ nr = ntohs(*(__be16 *) ptr);
+ ptr += 2;
+
+ /* Store L2TP info in the skb */
+ L2TP_SKB_CB(skb)->ns = ns;
+ L2TP_SKB_CB(skb)->has_seq = 1;
+
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: recv data ns=%u, nr=%u, session nr=%u\n",
+ session->name, ns, nr, session->nr);
+ }
+ } else if (session->l2specific_type == L2TP_L2SPECTYPE_DEFAULT) {
+ u32 l2h = ntohl(*(__be32 *) ptr);
+
+ if (l2h & 0x40000000) {
+ ns = l2h & 0x00ffffff;
+
+ /* Store L2TP info in the skb */
+ L2TP_SKB_CB(skb)->ns = ns;
+ L2TP_SKB_CB(skb)->has_seq = 1;
+
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: recv data ns=%u, session nr=%u\n",
+ session->name, ns, session->nr);
+ }
+ }
+
+ /* Advance past L2-specific header, if present */
+ ptr += session->l2specific_len;
+
+ if (L2TP_SKB_CB(skb)->has_seq) {
+ /* Received a packet with sequence numbers. If we're the LNS,
+ * check if we sre sending sequence numbers and if not,
+ * configure it so.
+ */
+ if ((!session->lns_mode) && (!session->send_seq)) {
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_INFO,
+ "%s: requested to enable seq numbers by LNS\n",
+ session->name);
+ session->send_seq = -1;
+ l2tp_session_set_header_len(session, tunnel->version);
+ }
+ } else {
+ /* No sequence numbers.
+ * If user has configured mandatory sequence numbers, discard.
+ */
+ if (session->recv_seq) {
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_WARNING,
+ "%s: recv data has no seq numbers when required. "
+ "Discarding\n", session->name);
+ session->stats.rx_seq_discards++;
+ goto discard;
+ }
+
+ /* If we're the LAC and we're sending sequence numbers, the
+ * LNS has requested that we no longer send sequence numbers.
+ * If we're the LNS and we're sending sequence numbers, the
+ * LAC is broken. Discard the frame.
+ */
+ if ((!session->lns_mode) && (session->send_seq)) {
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_INFO,
+ "%s: requested to disable seq numbers by LNS\n",
+ session->name);
+ session->send_seq = 0;
+ l2tp_session_set_header_len(session, tunnel->version);
+ } else if (session->send_seq) {
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_WARNING,
+ "%s: recv data has no seq numbers when required. "
+ "Discarding\n", session->name);
+ session->stats.rx_seq_discards++;
+ goto discard;
+ }
+ }
+
+ /* Session data offset is handled differently for L2TPv2 and
+ * L2TPv3. For L2TPv2, there is an optional 16-bit value in
+ * the header. For L2TPv3, the offset is negotiated using AVPs
+ * in the session setup control protocol.
+ */
+ if (tunnel->version == L2TP_HDR_VER_2) {
+ /* If offset bit set, skip it. */
+ if (hdrflags & L2TP_HDRFLAG_O) {
+ offset = ntohs(*(__be16 *)ptr);
+ ptr += 2 + offset;
+ }
+ } else
+ ptr += session->offset;
+
+ offset = ptr - optr;
+ if (!pskb_may_pull(skb, offset))
+ goto discard;
+
+ __skb_pull(skb, offset);
+
+ /* If caller wants to process the payload before we queue the
+ * packet, do so now.
+ */
+ if (payload_hook)
+ if ((*payload_hook)(skb))
+ goto discard;
+
+ /* Prepare skb for adding to the session's reorder_q. Hold
+ * packets for max reorder_timeout or 1 second if not
+ * reordering.
+ */
+ L2TP_SKB_CB(skb)->length = length;
+ L2TP_SKB_CB(skb)->expires = jiffies +
+ (session->reorder_timeout ? session->reorder_timeout : HZ);
+
+ /* Add packet to the session's receive queue. Reordering is done here, if
+ * enabled. Saved L2TP protocol info is stored in skb->sb[].
+ */
+ if (L2TP_SKB_CB(skb)->has_seq) {
+ if (session->reorder_timeout != 0) {
+ /* Packet reordering enabled. Add skb to session's
+ * reorder queue, in order of ns.
+ */
+ l2tp_recv_queue_skb(session, skb);
+ } else {
+ /* Packet reordering disabled. Discard out-of-sequence
+ * packets
+ */
+ if (L2TP_SKB_CB(skb)->ns != session->nr) {
+ session->stats.rx_seq_discards++;
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: oos pkt %u len %d discarded, "
+ "waiting for %u, reorder_q_len=%d\n",
+ session->name, L2TP_SKB_CB(skb)->ns,
+ L2TP_SKB_CB(skb)->length, session->nr,
+ skb_queue_len(&session->reorder_q));
+ goto discard;
+ }
+ skb_queue_tail(&session->reorder_q, skb);
+ }
+ } else {
+ /* No sequence numbers. Add the skb to the tail of the
+ * reorder queue. This ensures that it will be
+ * delivered after all previous sequenced skbs.
+ */
+ skb_queue_tail(&session->reorder_q, skb);
+ }
+
+ /* Try to dequeue as many skbs from reorder_q as we can. */
+ l2tp_recv_dequeue(session);
+
+ l2tp_session_dec_refcount(session);
+
+ return;
+
+discard:
+ session->stats.rx_errors++;
+ kfree_skb(skb);
+
+ if (session->deref)
+ (*session->deref)(session);
+
+ l2tp_session_dec_refcount(session);
+}
+EXPORT_SYMBOL(l2tp_recv_common);
+
+/* Internal UDP receive frame. Do the real work of receiving an L2TP data frame
+ * here. The skb is not on a list when we get here.
+ * Returns 0 if the packet was a data packet and was successfully passed on.
+ * Returns 1 if the packet was not a good data packet and could not be
+ * forwarded. All such packets are passed up to userspace to deal with.
+ */
+static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb,
+ int (*payload_hook)(struct sk_buff *skb))
+{
+ struct l2tp_session *session = NULL;
+ unsigned char *ptr, *optr;
+ u16 hdrflags;
+ u32 tunnel_id, session_id;
+ int offset;
+ u16 version;
+ int length;
+
+ if (tunnel->sock && l2tp_verify_udp_checksum(tunnel->sock, skb))
+ goto discard_bad_csum;
+
+ /* UDP always verifies the packet length. */
+ __skb_pull(skb, sizeof(struct udphdr));
+
+ /* Short packet? */
+ if (!pskb_may_pull(skb, L2TP_HDR_SIZE_SEQ)) {
+ PRINTK(tunnel->debug, L2TP_MSG_DATA, KERN_INFO,
+ "%s: recv short packet (len=%d)\n", tunnel->name, skb->len);
+ goto error;
+ }
+
+ /* Trace packet contents, if enabled */
+ if (tunnel->debug & L2TP_MSG_DATA) {
+ length = min(32u, skb->len);
+ if (!pskb_may_pull(skb, length))
+ goto error;
+
+ printk(KERN_DEBUG "%s: recv: ", tunnel->name);
+
+ offset = 0;
+ do {
+ printk(" %02X", skb->data[offset]);
+ } while (++offset < length);
+
+ printk("\n");
+ }
+
+ /* Point to L2TP header */
+ optr = ptr = skb->data;
+
+ /* Get L2TP header flags */
+ hdrflags = ntohs(*(__be16 *) ptr);
+
+ /* Check protocol version */
+ version = hdrflags & L2TP_HDR_VER_MASK;
+ if (version != tunnel->version) {
+ PRINTK(tunnel->debug, L2TP_MSG_DATA, KERN_INFO,
+ "%s: recv protocol version mismatch: got %d expected %d\n",
+ tunnel->name, version, tunnel->version);
+ goto error;
+ }
+
+ /* Get length of L2TP packet */
+ length = skb->len;
+
+ /* If type is control packet, it is handled by userspace. */
+ if (hdrflags & L2TP_HDRFLAG_T) {
+ PRINTK(tunnel->debug, L2TP_MSG_DATA, KERN_DEBUG,
+ "%s: recv control packet, len=%d\n", tunnel->name, length);
+ goto error;
+ }
+
+ /* Skip flags */
+ ptr += 2;
+
+ if (tunnel->version == L2TP_HDR_VER_2) {
+ /* If length is present, skip it */
+ if (hdrflags & L2TP_HDRFLAG_L)
+ ptr += 2;
+
+ /* Extract tunnel and session ID */
+ tunnel_id = ntohs(*(__be16 *) ptr);
+ ptr += 2;
+ session_id = ntohs(*(__be16 *) ptr);
+ ptr += 2;
+ } else {
+ ptr += 2; /* skip reserved bits */
+ tunnel_id = tunnel->tunnel_id;
+ session_id = ntohl(*(__be32 *) ptr);
+ ptr += 4;
+ }
+
+ /* Find the session context */
+ session = l2tp_session_find(tunnel->l2tp_net, tunnel, session_id);
+ if (!session || !session->recv_skb) {
+ /* Not found? Pass to userspace to deal with */
+ PRINTK(tunnel->debug, L2TP_MSG_DATA, KERN_INFO,
+ "%s: no session found (%u/%u). Passing up.\n",
+ tunnel->name, tunnel_id, session_id);
+ goto error;
+ }
+
+ l2tp_recv_common(session, skb, ptr, optr, hdrflags, length, payload_hook);
+
+ return 0;
+
+discard_bad_csum:
+ LIMIT_NETDEBUG("%s: UDP: bad checksum\n", tunnel->name);
+ UDP_INC_STATS_USER(tunnel->l2tp_net, UDP_MIB_INERRORS, 0);
+ tunnel->stats.rx_errors++;
+ kfree_skb(skb);
+
+ return 0;
+
+error:
+ /* Put UDP header back */
+ __skb_push(skb, sizeof(struct udphdr));
+
+ return 1;
+}
+
+/* UDP encapsulation receive handler. See net/ipv4/udp.c.
+ * Return codes:
+ * 0 : success.
+ * <0: error
+ * >0: skb should be passed up to userspace as UDP.
+ */
+int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
+{
+ struct l2tp_tunnel *tunnel;
+
+ tunnel = l2tp_sock_to_tunnel(sk);
+ if (tunnel == NULL)
+ goto pass_up;
+
+ PRINTK(tunnel->debug, L2TP_MSG_DATA, KERN_DEBUG,
+ "%s: received %d bytes\n", tunnel->name, skb->len);
+
+ if (l2tp_udp_recv_core(tunnel, skb, tunnel->recv_payload_hook))
+ goto pass_up_put;
+
+ sock_put(sk);
+ return 0;
+
+pass_up_put:
+ sock_put(sk);
+pass_up:
+ return 1;
+}
+EXPORT_SYMBOL_GPL(l2tp_udp_encap_recv);
+
+/************************************************************************
+ * Transmit handling
+ ***********************************************************************/
+
+/* Build an L2TP header for the session into the buffer provided.
+ */
+static int l2tp_build_l2tpv2_header(struct l2tp_session *session, void *buf)
+{
+ struct l2tp_tunnel *tunnel = session->tunnel;
+ __be16 *bufp = buf;
+ __be16 *optr = buf;
+ u16 flags = L2TP_HDR_VER_2;
+ u32 tunnel_id = tunnel->peer_tunnel_id;
+ u32 session_id = session->peer_session_id;
+
+ if (session->send_seq)
+ flags |= L2TP_HDRFLAG_S;
+
+ /* Setup L2TP header. */
+ *bufp++ = htons(flags);
+ *bufp++ = htons(tunnel_id);
+ *bufp++ = htons(session_id);
+ if (session->send_seq) {
+ *bufp++ = htons(session->ns);
+ *bufp++ = 0;
+ session->ns++;
+ session->ns &= 0xffff;
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: updated ns to %u\n", session->name, session->ns);
+ }
+
+ return bufp - optr;
+}
+
+static int l2tp_build_l2tpv3_header(struct l2tp_session *session, void *buf)
+{
+ struct l2tp_tunnel *tunnel = session->tunnel;
+ char *bufp = buf;
+ char *optr = bufp;
+
+ /* Setup L2TP header. The header differs slightly for UDP and
+ * IP encapsulations. For UDP, there is 4 bytes of flags.
+ */
+ if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {
+ u16 flags = L2TP_HDR_VER_3;
+ *((__be16 *) bufp) = htons(flags);
+ bufp += 2;
+ *((__be16 *) bufp) = 0;
+ bufp += 2;
+ }
+
+ *((__be32 *) bufp) = htonl(session->peer_session_id);
+ bufp += 4;
+ if (session->cookie_len) {
+ memcpy(bufp, &session->cookie[0], session->cookie_len);
+ bufp += session->cookie_len;
+ }
+ if (session->l2specific_len) {
+ if (session->l2specific_type == L2TP_L2SPECTYPE_DEFAULT) {
+ u32 l2h = 0;
+ if (session->send_seq) {
+ l2h = 0x40000000 | session->ns;
+ session->ns++;
+ session->ns &= 0xffffff;
+ PRINTK(session->debug, L2TP_MSG_SEQ, KERN_DEBUG,
+ "%s: updated ns to %u\n", session->name, session->ns);
+ }
+
+ *((__be32 *) bufp) = htonl(l2h);
+ }
+ bufp += session->l2specific_len;
+ }
+ if (session->offset)
+ bufp += session->offset;
+
+ return bufp - optr;
+}
+
+static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
+ struct flowi *fl, size_t data_len)
+{
+ struct l2tp_tunnel *tunnel = session->tunnel;
+ unsigned int len = skb->len;
+ int error;
+
+ /* Debug */
+ if (session->send_seq)
+ PRINTK(session->debug, L2TP_MSG_DATA, KERN_DEBUG,
+ "%s: send %Zd bytes, ns=%u\n", session->name,
+ data_len, session->ns - 1);
+ else
+ PRINTK(session->debug, L2TP_MSG_DATA, KERN_DEBUG,
+ "%s: send %Zd bytes\n", session->name, data_len);
+
+ if (session->debug & L2TP_MSG_DATA) {
+ int i;
+ int uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
+ unsigned char *datap = skb->data + uhlen;
+
+ printk(KERN_DEBUG "%s: xmit:", session->name);
+ for (i = 0; i < (len - uhlen); i++) {
+ printk(" %02X", *datap++);
+ if (i == 31) {
+ printk(" ...");
+ break;
+ }
+ }
+ printk("\n");
+ }
+
+ /* Queue the packet to IP for output */
+ skb->local_df = 1;
+ error = ip_queue_xmit(skb, fl);
+
+ /* Update stats */
+ if (error >= 0) {
+ tunnel->stats.tx_packets++;
+ tunnel->stats.tx_bytes += len;
+ session->stats.tx_packets++;
+ session->stats.tx_bytes += len;
+ } else {
+ tunnel->stats.tx_errors++;
+ session->stats.tx_errors++;
+ }
+
+ return 0;
+}
+
+/* Automatically called when the skb is freed.
+ */
+static void l2tp_sock_wfree(struct sk_buff *skb)
+{
+ sock_put(skb->sk);
+}
+
+/* For data skbs that we transmit, we associate with the tunnel socket
+ * but don't do accounting.
+ */
+static inline void l2tp_skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
+{
+ sock_hold(sk);
+ skb->sk = sk;
+ skb->destructor = l2tp_sock_wfree;
+}
+
+/* If caller requires the skb to have a ppp header, the header must be
+ * inserted in the skb data before calling this function.
+ */
+int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len)
+{
+ int data_len = skb->len;
+ struct l2tp_tunnel *tunnel = session->tunnel;
+ struct sock *sk = tunnel->sock;
+ struct flowi *fl;
+ struct udphdr *uh;
+ struct inet_sock *inet;
+ __wsum csum;
+ int old_headroom;
+ int new_headroom;
+ int headroom;
+ int uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
+ int udp_len;
+
+ /* Check that there's enough headroom in the skb to insert IP,
+ * UDP and L2TP headers. If not enough, expand it to
+ * make room. Adjust truesize.
+ */
+ headroom = NET_SKB_PAD + sizeof(struct iphdr) +
+ uhlen + hdr_len;
+ old_headroom = skb_headroom(skb);
+ if (skb_cow_head(skb, headroom)) {
+ dev_kfree_skb(skb);
+ goto abort;
+ }
+
+ new_headroom = skb_headroom(skb);
+ skb_orphan(skb);
+ skb->truesize += new_headroom - old_headroom;
+
+ /* Setup L2TP header */
+ session->build_header(session, __skb_push(skb, hdr_len));
+
+ /* Reset skb netfilter state */
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
+ IPSKB_REROUTED);
+ nf_reset(skb);
+
+ bh_lock_sock(sk);
+ if (sock_owned_by_user(sk)) {
+ dev_kfree_skb(skb);
+ goto out_unlock;
+ }
+
+ /* Get routing info from the tunnel socket */
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst_clone(__sk_dst_check(sk, 0)));
+
+ inet = inet_sk(sk);
+ fl = &inet->cork.fl;
+ switch (tunnel->encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ /* Setup UDP header */
+ __skb_push(skb, sizeof(*uh));
+ skb_reset_transport_header(skb);
+ uh = udp_hdr(skb);
+ uh->source = inet->inet_sport;
+ uh->dest = inet->inet_dport;
+ udp_len = uhlen + hdr_len + data_len;
+ uh->len = htons(udp_len);
+ uh->check = 0;
+
+ /* Calculate UDP checksum if configured to do so */
+ if (sk->sk_no_check == UDP_CSUM_NOXMIT)
+ skb->ip_summed = CHECKSUM_NONE;
+ else if ((skb_dst(skb) && skb_dst(skb)->dev) &&
+ (!(skb_dst(skb)->dev->features & NETIF_F_V4_CSUM))) {
+ skb->ip_summed = CHECKSUM_COMPLETE;
+ csum = skb_checksum(skb, 0, udp_len, 0);
+ uh->check = csum_tcpudp_magic(inet->inet_saddr,
+ inet->inet_daddr,
+ udp_len, IPPROTO_UDP, csum);
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+ } else {
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct udphdr, check);
+ uh->check = ~csum_tcpudp_magic(inet->inet_saddr,
+ inet->inet_daddr,
+ udp_len, IPPROTO_UDP, 0);
+ }
+ break;
+
+ case L2TP_ENCAPTYPE_IP:
+ break;
+ }
+
+ l2tp_skb_set_owner_w(skb, sk);
+
+ l2tp_xmit_core(session, skb, fl, data_len);
+out_unlock:
+ bh_unlock_sock(sk);
+
+abort:
+ return 0;
+}
+EXPORT_SYMBOL_GPL(l2tp_xmit_skb);
+
+/*****************************************************************************
+ * Tinnel and session create/destroy.
+ *****************************************************************************/
+
+/* Tunnel socket destruct hook.
+ * The tunnel context is deleted only when all session sockets have been
+ * closed.
+ */
+static void l2tp_tunnel_destruct(struct sock *sk)
+{
+ struct l2tp_tunnel *tunnel;
+
+ tunnel = sk->sk_user_data;
+ if (tunnel == NULL)
+ goto end;
+
+ PRINTK(tunnel->debug, L2TP_MSG_CONTROL, KERN_INFO,
+ "%s: closing...\n", tunnel->name);
+
+ /* Close all sessions */
+ l2tp_tunnel_closeall(tunnel);
+
+ switch (tunnel->encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ /* No longer an encapsulation socket. See net/ipv4/udp.c */
+ (udp_sk(sk))->encap_type = 0;
+ (udp_sk(sk))->encap_rcv = NULL;
+ break;
+ case L2TP_ENCAPTYPE_IP:
+ break;
+ }
+
+ /* Remove hooks into tunnel socket */
+ tunnel->sock = NULL;
+ sk->sk_destruct = tunnel->old_sk_destruct;
+ sk->sk_user_data = NULL;
+
+ /* Call the original destructor */
+ if (sk->sk_destruct)
+ (*sk->sk_destruct)(sk);
+
+ /* We're finished with the socket */
+ l2tp_tunnel_dec_refcount(tunnel);
+
+end:
+ return;
+}
+
+/* When the tunnel is closed, all the attached sessions need to go too.
+ */
+static void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel)
+{
+ int hash;
+ struct hlist_node *walk;
+ struct hlist_node *tmp;
+ struct l2tp_session *session;
+
+ BUG_ON(tunnel == NULL);
+
+ PRINTK(tunnel->debug, L2TP_MSG_CONTROL, KERN_INFO,
+ "%s: closing all sessions...\n", tunnel->name);
+
+ write_lock_bh(&tunnel->hlist_lock);
+ for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
+again:
+ hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
+ session = hlist_entry(walk, struct l2tp_session, hlist);
+
+ PRINTK(session->debug, L2TP_MSG_CONTROL, KERN_INFO,
+ "%s: closing session\n", session->name);
+
+ hlist_del_init(&session->hlist);
+
+ /* Since we should hold the sock lock while
+ * doing any unbinding, we need to release the
+ * lock we're holding before taking that lock.
+ * Hold a reference to the sock so it doesn't
+ * disappear as we're jumping between locks.
+ */
+ if (session->ref != NULL)
+ (*session->ref)(session);
+
+ write_unlock_bh(&tunnel->hlist_lock);
+
+ if (tunnel->version != L2TP_HDR_VER_2) {
+ struct l2tp_net *pn = l2tp_pernet(tunnel->l2tp_net);
+
+ spin_lock_bh(&pn->l2tp_session_hlist_lock);
+ hlist_del_init_rcu(&session->global_hlist);
+ spin_unlock_bh(&pn->l2tp_session_hlist_lock);
+ synchronize_rcu();
+ }
+
+ if (session->session_close != NULL)
+ (*session->session_close)(session);
+
+ if (session->deref != NULL)
+ (*session->deref)(session);
+
+ write_lock_bh(&tunnel->hlist_lock);
+
+ /* Now restart from the beginning of this hash
+ * chain. We always remove a session from the
+ * list so we are guaranteed to make forward
+ * progress.
+ */
+ goto again;
+ }
+ }
+ write_unlock_bh(&tunnel->hlist_lock);
+}
+
+/* Really kill the tunnel.
+ * Come here only when all sessions have been cleared from the tunnel.
+ */
+static void l2tp_tunnel_free(struct l2tp_tunnel *tunnel)
+{
+ struct l2tp_net *pn = l2tp_pernet(tunnel->l2tp_net);
+
+ BUG_ON(atomic_read(&tunnel->ref_count) != 0);
+ BUG_ON(tunnel->sock != NULL);
+
+ PRINTK(tunnel->debug, L2TP_MSG_CONTROL, KERN_INFO,
+ "%s: free...\n", tunnel->name);
+
+ /* Remove from tunnel list */
+ spin_lock_bh(&pn->l2tp_tunnel_list_lock);
+ list_del_rcu(&tunnel->list);
+ kfree_rcu(tunnel, rcu);
+ spin_unlock_bh(&pn->l2tp_tunnel_list_lock);
+
+ atomic_dec(&l2tp_tunnel_count);
+}
+
+/* Create a socket for the tunnel, if one isn't set up by
+ * userspace. This is used for static tunnels where there is no
+ * managing L2TP daemon.
+ */
+static int l2tp_tunnel_sock_create(u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct socket **sockp)
+{
+ int err = -EINVAL;
+ struct sockaddr_in udp_addr;
+ struct sockaddr_l2tpip ip_addr;
+ struct socket *sock = NULL;
+
+ switch (cfg->encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ err = sock_create(AF_INET, SOCK_DGRAM, 0, sockp);
+ if (err < 0)
+ goto out;
+
+ sock = *sockp;
+
+ memset(&udp_addr, 0, sizeof(udp_addr));
+ udp_addr.sin_family = AF_INET;
+ udp_addr.sin_addr = cfg->local_ip;
+ udp_addr.sin_port = htons(cfg->local_udp_port);
+ err = kernel_bind(sock, (struct sockaddr *) &udp_addr, sizeof(udp_addr));
+ if (err < 0)
+ goto out;
+
+ udp_addr.sin_family = AF_INET;
+ udp_addr.sin_addr = cfg->peer_ip;
+ udp_addr.sin_port = htons(cfg->peer_udp_port);
+ err = kernel_connect(sock, (struct sockaddr *) &udp_addr, sizeof(udp_addr), 0);
+ if (err < 0)
+ goto out;
+
+ if (!cfg->use_udp_checksums)
+ sock->sk->sk_no_check = UDP_CSUM_NOXMIT;
+
+ break;
+
+ case L2TP_ENCAPTYPE_IP:
+ err = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_L2TP, sockp);
+ if (err < 0)
+ goto out;
+
+ sock = *sockp;
+
+ memset(&ip_addr, 0, sizeof(ip_addr));
+ ip_addr.l2tp_family = AF_INET;
+ ip_addr.l2tp_addr = cfg->local_ip;
+ ip_addr.l2tp_conn_id = tunnel_id;
+ err = kernel_bind(sock, (struct sockaddr *) &ip_addr, sizeof(ip_addr));
+ if (err < 0)
+ goto out;
+
+ ip_addr.l2tp_family = AF_INET;
+ ip_addr.l2tp_addr = cfg->peer_ip;
+ ip_addr.l2tp_conn_id = peer_tunnel_id;
+ err = kernel_connect(sock, (struct sockaddr *) &ip_addr, sizeof(ip_addr), 0);
+ if (err < 0)
+ goto out;
+
+ break;
+
+ default:
+ goto out;
+ }
+
+out:
+ if ((err < 0) && sock) {
+ sock_release(sock);
+ *sockp = NULL;
+ }
+
+ return err;
+}
+
+int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct l2tp_tunnel **tunnelp)
+{
+ struct l2tp_tunnel *tunnel = NULL;
+ int err;
+ struct socket *sock = NULL;
+ struct sock *sk = NULL;
+ struct l2tp_net *pn;
+ enum l2tp_encap_type encap = L2TP_ENCAPTYPE_UDP;
+
+ /* Get the tunnel socket from the fd, which was opened by
+ * the userspace L2TP daemon. If not specified, create a
+ * kernel socket.
+ */
+ if (fd < 0) {
+ err = l2tp_tunnel_sock_create(tunnel_id, peer_tunnel_id, cfg, &sock);
+ if (err < 0)
+ goto err;
+ } else {
+ err = -EBADF;
+ sock = sockfd_lookup(fd, &err);
+ if (!sock) {
+ printk(KERN_ERR "tunl %hu: sockfd_lookup(fd=%d) returned %d\n",
+ tunnel_id, fd, err);
+ goto err;
+ }
+ }
+
+ sk = sock->sk;
+
+ if (cfg != NULL)
+ encap = cfg->encap;
+
+ /* Quick sanity checks */
+ switch (encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ err = -EPROTONOSUPPORT;
+ if (sk->sk_protocol != IPPROTO_UDP) {
+ printk(KERN_ERR "tunl %hu: fd %d wrong protocol, got %d, expected %d\n",
+ tunnel_id, fd, sk->sk_protocol, IPPROTO_UDP);
+ goto err;
+ }
+ break;
+ case L2TP_ENCAPTYPE_IP:
+ err = -EPROTONOSUPPORT;
+ if (sk->sk_protocol != IPPROTO_L2TP) {
+ printk(KERN_ERR "tunl %hu: fd %d wrong protocol, got %d, expected %d\n",
+ tunnel_id, fd, sk->sk_protocol, IPPROTO_L2TP);
+ goto err;
+ }
+ break;
+ }
+
+ /* Check if this socket has already been prepped */
+ tunnel = (struct l2tp_tunnel *)sk->sk_user_data;
+ if (tunnel != NULL) {
+ /* This socket has already been prepped */
+ err = -EBUSY;
+ goto err;
+ }
+
+ tunnel = kzalloc(sizeof(struct l2tp_tunnel), GFP_KERNEL);
+ if (tunnel == NULL) {
+ err = -ENOMEM;
+ goto err;
+ }
+
+ tunnel->version = version;
+ tunnel->tunnel_id = tunnel_id;
+ tunnel->peer_tunnel_id = peer_tunnel_id;
+ tunnel->debug = L2TP_DEFAULT_DEBUG_FLAGS;
+
+ tunnel->magic = L2TP_TUNNEL_MAGIC;
+ sprintf(&tunnel->name[0], "tunl %u", tunnel_id);
+ rwlock_init(&tunnel->hlist_lock);
+
+ /* The net we belong to */
+ tunnel->l2tp_net = net;
+ pn = l2tp_pernet(net);
+
+ if (cfg != NULL)
+ tunnel->debug = cfg->debug;
+
+ /* Mark socket as an encapsulation socket. See net/ipv4/udp.c */
+ tunnel->encap = encap;
+ if (encap == L2TP_ENCAPTYPE_UDP) {
+ /* Mark socket as an encapsulation socket. See net/ipv4/udp.c */
+ udp_sk(sk)->encap_type = UDP_ENCAP_L2TPINUDP;
+ udp_sk(sk)->encap_rcv = l2tp_udp_encap_recv;
+ }
+
+ sk->sk_user_data = tunnel;
+
+ /* Hook on the tunnel socket destructor so that we can cleanup
+ * if the tunnel socket goes away.
+ */
+ tunnel->old_sk_destruct = sk->sk_destruct;
+ sk->sk_destruct = &l2tp_tunnel_destruct;
+ tunnel->sock = sk;
+ sk->sk_allocation = GFP_ATOMIC;
+
+ /* Add tunnel to our list */
+ INIT_LIST_HEAD(&tunnel->list);
+ atomic_inc(&l2tp_tunnel_count);
+
+ /* Bump the reference count. The tunnel context is deleted
+ * only when this drops to zero. Must be done before list insertion
+ */
+ l2tp_tunnel_inc_refcount(tunnel);
+ spin_lock_bh(&pn->l2tp_tunnel_list_lock);
+ list_add_rcu(&tunnel->list, &pn->l2tp_tunnel_list);
+ spin_unlock_bh(&pn->l2tp_tunnel_list_lock);
+
+ err = 0;
+err:
+ if (tunnelp)
+ *tunnelp = tunnel;
+
+ /* If tunnel's socket was created by the kernel, it doesn't
+ * have a file.
+ */
+ if (sock && sock->file)
+ sockfd_put(sock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(l2tp_tunnel_create);
+
+/* This function is used by the netlink TUNNEL_DELETE command.
+ */
+int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel)
+{
+ int err = 0;
+ struct socket *sock = tunnel->sock ? tunnel->sock->sk_socket : NULL;
+
+ /* Force the tunnel socket to close. This will eventually
+ * cause the tunnel to be deleted via the normal socket close
+ * mechanisms when userspace closes the tunnel socket.
+ */
+ if (sock != NULL) {
+ err = inet_shutdown(sock, 2);
+
+ /* If the tunnel's socket was created by the kernel,
+ * close the socket here since the socket was not
+ * created by userspace.
+ */
+ if (sock->file == NULL)
+ err = inet_release(sock);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(l2tp_tunnel_delete);
+
+/* Really kill the session.
+ */
+void l2tp_session_free(struct l2tp_session *session)
+{
+ struct l2tp_tunnel *tunnel;
+
+ BUG_ON(atomic_read(&session->ref_count) != 0);
+
+ tunnel = session->tunnel;
+ if (tunnel != NULL) {
+ BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
+
+ /* Delete the session from the hash */
+ write_lock_bh(&tunnel->hlist_lock);
+ hlist_del_init(&session->hlist);
+ write_unlock_bh(&tunnel->hlist_lock);
+
+ /* Unlink from the global hash if not L2TPv2 */
+ if (tunnel->version != L2TP_HDR_VER_2) {
+ struct l2tp_net *pn = l2tp_pernet(tunnel->l2tp_net);
+
+ spin_lock_bh(&pn->l2tp_session_hlist_lock);
+ hlist_del_init_rcu(&session->global_hlist);
+ spin_unlock_bh(&pn->l2tp_session_hlist_lock);
+ synchronize_rcu();
+ }
+
+ if (session->session_id != 0)
+ atomic_dec(&l2tp_session_count);
+
+ sock_put(tunnel->sock);
+
+ /* This will delete the tunnel context if this
+ * is the last session on the tunnel.
+ */
+ session->tunnel = NULL;
+ l2tp_tunnel_dec_refcount(tunnel);
+ }
+
+ kfree(session);
+
+ return;
+}
+EXPORT_SYMBOL_GPL(l2tp_session_free);
+
+/* This function is used by the netlink SESSION_DELETE command and by
+ pseudowire modules.
+ */
+int l2tp_session_delete(struct l2tp_session *session)
+{
+ if (session->session_close != NULL)
+ (*session->session_close)(session);
+
+ l2tp_session_dec_refcount(session);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(l2tp_session_delete);
+
+
+/* We come here whenever a session's send_seq, cookie_len or
+ * l2specific_len parameters are set.
+ */
+static void l2tp_session_set_header_len(struct l2tp_session *session, int version)
+{
+ if (version == L2TP_HDR_VER_2) {
+ session->hdr_len = 6;
+ if (session->send_seq)
+ session->hdr_len += 4;
+ } else {
+ session->hdr_len = 4 + session->cookie_len + session->l2specific_len + session->offset;
+ if (session->tunnel->encap == L2TP_ENCAPTYPE_UDP)
+ session->hdr_len += 4;
+ }
+
+}
+
+struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunnel, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
+{
+ struct l2tp_session *session;
+
+ session = kzalloc(sizeof(struct l2tp_session) + priv_size, GFP_KERNEL);
+ if (session != NULL) {
+ session->magic = L2TP_SESSION_MAGIC;
+ session->tunnel = tunnel;
+
+ session->session_id = session_id;
+ session->peer_session_id = peer_session_id;
+ session->nr = 1;
+
+ sprintf(&session->name[0], "sess %u/%u",
+ tunnel->tunnel_id, session->session_id);
+
+ skb_queue_head_init(&session->reorder_q);
+
+ INIT_HLIST_NODE(&session->hlist);
+ INIT_HLIST_NODE(&session->global_hlist);
+
+ /* Inherit debug options from tunnel */
+ session->debug = tunnel->debug;
+
+ if (cfg) {
+ session->pwtype = cfg->pw_type;
+ session->debug = cfg->debug;
+ session->mtu = cfg->mtu;
+ session->mru = cfg->mru;
+ session->send_seq = cfg->send_seq;
+ session->recv_seq = cfg->recv_seq;
+ session->lns_mode = cfg->lns_mode;
+ session->reorder_timeout = cfg->reorder_timeout;
+ session->offset = cfg->offset;
+ session->l2specific_type = cfg->l2specific_type;
+ session->l2specific_len = cfg->l2specific_len;
+ session->cookie_len = cfg->cookie_len;
+ memcpy(&session->cookie[0], &cfg->cookie[0], cfg->cookie_len);
+ session->peer_cookie_len = cfg->peer_cookie_len;
+ memcpy(&session->peer_cookie[0], &cfg->peer_cookie[0], cfg->peer_cookie_len);
+ }
+
+ if (tunnel->version == L2TP_HDR_VER_2)
+ session->build_header = l2tp_build_l2tpv2_header;
+ else
+ session->build_header = l2tp_build_l2tpv3_header;
+
+ l2tp_session_set_header_len(session, tunnel->version);
+
+ /* Bump the reference count. The session context is deleted
+ * only when this drops to zero.
+ */
+ l2tp_session_inc_refcount(session);
+ l2tp_tunnel_inc_refcount(tunnel);
+
+ /* Ensure tunnel socket isn't deleted */
+ sock_hold(tunnel->sock);
+
+ /* Add session to the tunnel's hash list */
+ write_lock_bh(&tunnel->hlist_lock);
+ hlist_add_head(&session->hlist,
+ l2tp_session_id_hash(tunnel, session_id));
+ write_unlock_bh(&tunnel->hlist_lock);
+
+ /* And to the global session list if L2TPv3 */
+ if (tunnel->version != L2TP_HDR_VER_2) {
+ struct l2tp_net *pn = l2tp_pernet(tunnel->l2tp_net);
+
+ spin_lock_bh(&pn->l2tp_session_hlist_lock);
+ hlist_add_head_rcu(&session->global_hlist,
+ l2tp_session_id_hash_2(pn, session_id));
+ spin_unlock_bh(&pn->l2tp_session_hlist_lock);
+ }
+
+ /* Ignore management session in session count value */
+ if (session->session_id != 0)
+ atomic_inc(&l2tp_session_count);
+ }
+
+ return session;
+}
+EXPORT_SYMBOL_GPL(l2tp_session_create);
+
+/*****************************************************************************
+ * Init and cleanup
+ *****************************************************************************/
+
+static __net_init int l2tp_init_net(struct net *net)
+{
+ struct l2tp_net *pn = net_generic(net, l2tp_net_id);
+ int hash;
+
+ INIT_LIST_HEAD(&pn->l2tp_tunnel_list);
+ spin_lock_init(&pn->l2tp_tunnel_list_lock);
+
+ for (hash = 0; hash < L2TP_HASH_SIZE_2; hash++)
+ INIT_HLIST_HEAD(&pn->l2tp_session_hlist[hash]);
+
+ spin_lock_init(&pn->l2tp_session_hlist_lock);
+
+ return 0;
+}
+
+static struct pernet_operations l2tp_net_ops = {
+ .init = l2tp_init_net,
+ .id = &l2tp_net_id,
+ .size = sizeof(struct l2tp_net),
+};
+
+static int __init l2tp_init(void)
+{
+ int rc = 0;
+
+ rc = register_pernet_device(&l2tp_net_ops);
+ if (rc)
+ goto out;
+
+ printk(KERN_INFO "L2TP core driver, %s\n", L2TP_DRV_VERSION);
+
+out:
+ return rc;
+}
+
+static void __exit l2tp_exit(void)
+{
+ unregister_pernet_device(&l2tp_net_ops);
+}
+
+module_init(l2tp_init);
+module_exit(l2tp_exit);
+
+MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
+MODULE_DESCRIPTION("L2TP core");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(L2TP_DRV_VERSION);
+
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_core.h b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_core.h
new file mode 100644
index 0000000..4393794
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_core.h
@@ -0,0 +1,272 @@
+/*
+ * L2TP internal definitions.
+ *
+ * Copyright (c) 2008,2009 Katalix Systems Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _L2TP_CORE_H_
+#define _L2TP_CORE_H_
+
+/* Just some random numbers */
+#define L2TP_TUNNEL_MAGIC 0x42114DDA
+#define L2TP_SESSION_MAGIC 0x0C04EB7D
+
+/* Per tunnel, session hash table size */
+#define L2TP_HASH_BITS 4
+#define L2TP_HASH_SIZE (1 << L2TP_HASH_BITS)
+
+/* System-wide, session hash table size */
+#define L2TP_HASH_BITS_2 8
+#define L2TP_HASH_SIZE_2 (1 << L2TP_HASH_BITS_2)
+
+/* Debug message categories for the DEBUG socket option */
+enum {
+ L2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if
+ * compiled in) */
+ L2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel
+ * interface */
+ L2TP_MSG_SEQ = (1 << 2), /* sequence numbers */
+ L2TP_MSG_DATA = (1 << 3), /* data packets */
+};
+
+struct sk_buff;
+
+struct l2tp_stats {
+ u64 tx_packets;
+ u64 tx_bytes;
+ u64 tx_errors;
+ u64 rx_packets;
+ u64 rx_bytes;
+ u64 rx_seq_discards;
+ u64 rx_oos_packets;
+ u64 rx_errors;
+ u64 rx_cookie_discards;
+};
+
+struct l2tp_tunnel;
+
+/* Describes a session. Contains information to determine incoming
+ * packets and transmit outgoing ones.
+ */
+struct l2tp_session_cfg {
+ enum l2tp_pwtype pw_type;
+ unsigned data_seq:2; /* data sequencing level
+ * 0 => none, 1 => IP only,
+ * 2 => all
+ */
+ unsigned recv_seq:1; /* expect receive packets with
+ * sequence numbers? */
+ unsigned send_seq:1; /* send packets with sequence
+ * numbers? */
+ unsigned lns_mode:1; /* behave as LNS? LAC enables
+ * sequence numbers under
+ * control of LNS. */
+ int debug; /* bitmask of debug message
+ * categories */
+ u16 vlan_id; /* VLAN pseudowire only */
+ u16 offset; /* offset to payload */
+ u16 l2specific_len; /* Layer 2 specific length */
+ u16 l2specific_type; /* Layer 2 specific type */
+ u8 cookie[8]; /* optional cookie */
+ int cookie_len; /* 0, 4 or 8 bytes */
+ u8 peer_cookie[8]; /* peer's cookie */
+ int peer_cookie_len; /* 0, 4 or 8 bytes */
+ int reorder_timeout; /* configured reorder timeout
+ * (in jiffies) */
+ int mtu;
+ int mru;
+ char *ifname;
+};
+
+struct l2tp_session {
+ int magic; /* should be
+ * L2TP_SESSION_MAGIC */
+
+ struct l2tp_tunnel *tunnel; /* back pointer to tunnel
+ * context */
+ u32 session_id;
+ u32 peer_session_id;
+ u8 cookie[8];
+ int cookie_len;
+ u8 peer_cookie[8];
+ int peer_cookie_len;
+ u16 offset; /* offset from end of L2TP header
+ to beginning of data */
+ u16 l2specific_len;
+ u16 l2specific_type;
+ u16 hdr_len;
+ u32 nr; /* session NR state (receive) */
+ u32 ns; /* session NR state (send) */
+ struct sk_buff_head reorder_q; /* receive reorder queue */
+ struct hlist_node hlist; /* Hash list node */
+ atomic_t ref_count;
+
+ char name[32]; /* for logging */
+ char ifname[IFNAMSIZ];
+ unsigned data_seq:2; /* data sequencing level
+ * 0 => none, 1 => IP only,
+ * 2 => all
+ */
+ unsigned recv_seq:1; /* expect receive packets with
+ * sequence numbers? */
+ unsigned send_seq:1; /* send packets with sequence
+ * numbers? */
+ unsigned lns_mode:1; /* behave as LNS? LAC enables
+ * sequence numbers under
+ * control of LNS. */
+ int debug; /* bitmask of debug message
+ * categories */
+ int reorder_timeout; /* configured reorder timeout
+ * (in jiffies) */
+ int mtu;
+ int mru;
+ enum l2tp_pwtype pwtype;
+ struct l2tp_stats stats;
+ struct hlist_node global_hlist; /* Global hash list node */
+
+ int (*build_header)(struct l2tp_session *session, void *buf);
+ void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
+ void (*session_close)(struct l2tp_session *session);
+ void (*ref)(struct l2tp_session *session);
+ void (*deref)(struct l2tp_session *session);
+#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
+ void (*show)(struct seq_file *m, void *priv);
+#endif
+ uint8_t priv[0]; /* private data */
+};
+
+/* Describes the tunnel. It contains info to track all the associated
+ * sessions so incoming packets can be sorted out
+ */
+struct l2tp_tunnel_cfg {
+ int debug; /* bitmask of debug message
+ * categories */
+ enum l2tp_encap_type encap;
+
+ /* Used only for kernel-created sockets */
+ struct in_addr local_ip;
+ struct in_addr peer_ip;
+ u16 local_udp_port;
+ u16 peer_udp_port;
+ unsigned int use_udp_checksums:1;
+};
+
+struct l2tp_tunnel {
+ int magic; /* Should be L2TP_TUNNEL_MAGIC */
+ struct rcu_head rcu;
+ rwlock_t hlist_lock; /* protect session_hlist */
+ struct hlist_head session_hlist[L2TP_HASH_SIZE];
+ /* hashed list of sessions,
+ * hashed by id */
+ u32 tunnel_id;
+ u32 peer_tunnel_id;
+ int version; /* 2=>L2TPv2, 3=>L2TPv3 */
+
+ char name[20]; /* for logging */
+ int debug; /* bitmask of debug message
+ * categories */
+ enum l2tp_encap_type encap;
+ struct l2tp_stats stats;
+
+ struct list_head list; /* Keep a list of all tunnels */
+ struct net *l2tp_net; /* the net we belong to */
+
+ atomic_t ref_count;
+#ifdef CONFIG_DEBUG_FS
+ void (*show)(struct seq_file *m, void *arg);
+#endif
+ int (*recv_payload_hook)(struct sk_buff *skb);
+ void (*old_sk_destruct)(struct sock *);
+ struct sock *sock; /* Parent socket */
+ int fd;
+
+ uint8_t priv[0]; /* private data */
+};
+
+struct l2tp_nl_cmd_ops {
+ int (*session_create)(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg);
+ int (*session_delete)(struct l2tp_session *session);
+};
+
+static inline void *l2tp_tunnel_priv(struct l2tp_tunnel *tunnel)
+{
+ return &tunnel->priv[0];
+}
+
+static inline void *l2tp_session_priv(struct l2tp_session *session)
+{
+ return &session->priv[0];
+}
+
+static inline struct l2tp_tunnel *l2tp_sock_to_tunnel(struct sock *sk)
+{
+ struct l2tp_tunnel *tunnel;
+
+ if (sk == NULL)
+ return NULL;
+
+ sock_hold(sk);
+ tunnel = (struct l2tp_tunnel *)(sk->sk_user_data);
+ if (tunnel == NULL) {
+ sock_put(sk);
+ goto out;
+ }
+
+ BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
+
+out:
+ return tunnel;
+}
+
+extern struct l2tp_session *l2tp_session_find(struct net *net, struct l2tp_tunnel *tunnel, u32 session_id);
+extern struct l2tp_session *l2tp_session_find_nth(struct l2tp_tunnel *tunnel, int nth);
+extern struct l2tp_session *l2tp_session_find_by_ifname(struct net *net, char *ifname);
+extern struct l2tp_tunnel *l2tp_tunnel_find(struct net *net, u32 tunnel_id);
+extern struct l2tp_tunnel *l2tp_tunnel_find_nth(struct net *net, int nth);
+
+extern int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct l2tp_tunnel **tunnelp);
+extern int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
+extern struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunnel, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg);
+extern int l2tp_session_delete(struct l2tp_session *session);
+extern void l2tp_session_free(struct l2tp_session *session);
+extern void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, unsigned char *ptr, unsigned char *optr, u16 hdrflags, int length, int (*payload_hook)(struct sk_buff *skb));
+extern int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb);
+
+extern int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len);
+
+extern int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops);
+extern void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
+
+/* Session reference counts. Incremented when code obtains a reference
+ * to a session.
+ */
+static inline void l2tp_session_inc_refcount_1(struct l2tp_session *session)
+{
+ atomic_inc(&session->ref_count);
+}
+
+static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session)
+{
+ if (atomic_dec_and_test(&session->ref_count))
+ l2tp_session_free(session);
+}
+
+#ifdef L2TP_REFCNT_DEBUG
+#define l2tp_session_inc_refcount(_s) do { \
+ printk(KERN_DEBUG "l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n", __func__, __LINE__, (_s)->name, atomic_read(&_s->ref_count)); \
+ l2tp_session_inc_refcount_1(_s); \
+ } while (0)
+#define l2tp_session_dec_refcount(_s) do { \
+ printk(KERN_DEBUG "l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n", __func__, __LINE__, (_s)->name, atomic_read(&_s->ref_count)); \
+ l2tp_session_dec_refcount_1(_s); \
+ } while (0)
+#else
+#define l2tp_session_inc_refcount(s) l2tp_session_inc_refcount_1(s)
+#define l2tp_session_dec_refcount(s) l2tp_session_dec_refcount_1(s)
+#endif
+
+#endif /* _L2TP_CORE_H_ */
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_debugfs.c b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_debugfs.c
new file mode 100644
index 0000000..7613013
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_debugfs.c
@@ -0,0 +1,341 @@
+/*
+ * L2TP subsystem debugfs
+ *
+ * Copyright (c) 2010 Katalix Systems Ltd
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/hash.h>
+#include <linux/l2tp.h>
+#include <linux/in.h>
+#include <linux/etherdevice.h>
+#include <linux/spinlock.h>
+#include <linux/debugfs.h>
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/inet_common.h>
+#include <net/inet_hashtables.h>
+#include <net/tcp_states.h>
+#include <net/protocol.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+#include "l2tp_core.h"
+
+static struct dentry *rootdir;
+static struct dentry *tunnels;
+
+struct l2tp_dfs_seq_data {
+ struct net *net;
+ int tunnel_idx; /* current tunnel */
+ int session_idx; /* index of session within current tunnel */
+ struct l2tp_tunnel *tunnel;
+ struct l2tp_session *session; /* NULL means get next tunnel */
+};
+
+static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd)
+{
+ pd->tunnel = l2tp_tunnel_find_nth(pd->net, pd->tunnel_idx);
+ pd->tunnel_idx++;
+}
+
+static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
+{
+ pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
+ pd->session_idx++;
+
+ if (pd->session == NULL) {
+ pd->session_idx = 0;
+ l2tp_dfs_next_tunnel(pd);
+ }
+
+}
+
+static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
+{
+ struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN;
+ loff_t pos = *offs;
+
+ if (!pos)
+ goto out;
+
+ BUG_ON(m->private == NULL);
+ pd = m->private;
+
+ if (pd->tunnel == NULL)
+ l2tp_dfs_next_tunnel(pd);
+ else
+ l2tp_dfs_next_session(pd);
+
+ /* NULL tunnel and session indicates end of list */
+ if ((pd->tunnel == NULL) && (pd->session == NULL))
+ pd = NULL;
+
+out:
+ return pd;
+}
+
+
+static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ (*pos)++;
+ return NULL;
+}
+
+static void l2tp_dfs_seq_stop(struct seq_file *p, void *v)
+{
+ /* nothing to do */
+}
+
+static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
+{
+ struct l2tp_tunnel *tunnel = v;
+ int session_count = 0;
+ int hash;
+ struct hlist_node *walk;
+ struct hlist_node *tmp;
+
+ read_lock_bh(&tunnel->hlist_lock);
+ for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
+ hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
+ struct l2tp_session *session;
+
+ session = hlist_entry(walk, struct l2tp_session, hlist);
+ if (session->session_id == 0)
+ continue;
+
+ session_count++;
+ }
+ }
+ read_unlock_bh(&tunnel->hlist_lock);
+
+ seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id);
+ if (tunnel->sock) {
+ struct inet_sock *inet = inet_sk(tunnel->sock);
+ seq_printf(m, " from %pI4 to %pI4\n",
+ &inet->inet_saddr, &inet->inet_daddr);
+ if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
+ seq_printf(m, " source port %hu, dest port %hu\n",
+ ntohs(inet->inet_sport), ntohs(inet->inet_dport));
+ }
+ seq_printf(m, " L2TPv%d, %s\n", tunnel->version,
+ tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
+ tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" :
+ "");
+ seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count,
+ tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0,
+ atomic_read(&tunnel->ref_count));
+
+ seq_printf(m, " %08x rx %llu/%llu/%llu rx %llu/%llu/%llu\n",
+ tunnel->debug,
+ (unsigned long long)tunnel->stats.tx_packets,
+ (unsigned long long)tunnel->stats.tx_bytes,
+ (unsigned long long)tunnel->stats.tx_errors,
+ (unsigned long long)tunnel->stats.rx_packets,
+ (unsigned long long)tunnel->stats.rx_bytes,
+ (unsigned long long)tunnel->stats.rx_errors);
+
+ if (tunnel->show != NULL)
+ tunnel->show(m, tunnel);
+}
+
+static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
+{
+ struct l2tp_session *session = v;
+
+ seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id,
+ session->peer_session_id,
+ session->pwtype == L2TP_PWTYPE_ETH ? "ETH" :
+ session->pwtype == L2TP_PWTYPE_PPP ? "PPP" :
+ "");
+ if (session->send_seq || session->recv_seq)
+ seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns);
+ seq_printf(m, " refcnt %d\n", atomic_read(&session->ref_count));
+ seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n",
+ session->mtu, session->mru,
+ session->recv_seq ? 'R' : '-',
+ session->send_seq ? 'S' : '-',
+ session->data_seq == 1 ? "IPSEQ" :
+ session->data_seq == 2 ? "DATASEQ" : "-",
+ session->lns_mode ? "LNS" : "LAC",
+ session->debug,
+ jiffies_to_msecs(session->reorder_timeout));
+ seq_printf(m, " offset %hu l2specific %hu/%hu\n",
+ session->offset, session->l2specific_type, session->l2specific_len);
+ if (session->cookie_len) {
+ seq_printf(m, " cookie %02x%02x%02x%02x",
+ session->cookie[0], session->cookie[1],
+ session->cookie[2], session->cookie[3]);
+ if (session->cookie_len == 8)
+ seq_printf(m, "%02x%02x%02x%02x",
+ session->cookie[4], session->cookie[5],
+ session->cookie[6], session->cookie[7]);
+ seq_printf(m, "\n");
+ }
+ if (session->peer_cookie_len) {
+ seq_printf(m, " peer cookie %02x%02x%02x%02x",
+ session->peer_cookie[0], session->peer_cookie[1],
+ session->peer_cookie[2], session->peer_cookie[3]);
+ if (session->peer_cookie_len == 8)
+ seq_printf(m, "%02x%02x%02x%02x",
+ session->peer_cookie[4], session->peer_cookie[5],
+ session->peer_cookie[6], session->peer_cookie[7]);
+ seq_printf(m, "\n");
+ }
+
+ seq_printf(m, " %hu/%hu tx %llu/%llu/%llu rx %llu/%llu/%llu\n",
+ session->nr, session->ns,
+ (unsigned long long)session->stats.tx_packets,
+ (unsigned long long)session->stats.tx_bytes,
+ (unsigned long long)session->stats.tx_errors,
+ (unsigned long long)session->stats.rx_packets,
+ (unsigned long long)session->stats.rx_bytes,
+ (unsigned long long)session->stats.rx_errors);
+
+ if (session->show != NULL)
+ session->show(m, session);
+}
+
+static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
+{
+ struct l2tp_dfs_seq_data *pd = v;
+
+ /* display header on line 1 */
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n");
+ seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n");
+ seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n");
+ seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
+ seq_puts(m, " SESSION ID, peer ID, PWTYPE\n");
+ seq_puts(m, " refcnt cnt\n");
+ seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n");
+ seq_puts(m, " [ cookie ]\n");
+ seq_puts(m, " [ peer cookie ]\n");
+ seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
+ seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
+ goto out;
+ }
+
+ /* Show the tunnel or session context */
+ if (pd->session == NULL)
+ l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
+ else
+ l2tp_dfs_seq_session_show(m, pd->session);
+
+out:
+ return 0;
+}
+
+static const struct seq_operations l2tp_dfs_seq_ops = {
+ .start = l2tp_dfs_seq_start,
+ .next = l2tp_dfs_seq_next,
+ .stop = l2tp_dfs_seq_stop,
+ .show = l2tp_dfs_seq_show,
+};
+
+static int l2tp_dfs_seq_open(struct inode *inode, struct file *file)
+{
+ struct l2tp_dfs_seq_data *pd;
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+
+ pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+ if (pd == NULL)
+ goto out;
+
+ /* Derive the network namespace from the pid opening the
+ * file.
+ */
+ pd->net = get_net_ns_by_pid(current->pid);
+ if (IS_ERR(pd->net)) {
+ rc = PTR_ERR(pd->net);
+ goto err_free_pd;
+ }
+
+ rc = seq_open(file, &l2tp_dfs_seq_ops);
+ if (rc)
+ goto err_free_net;
+
+ seq = file->private_data;
+ seq->private = pd;
+
+out:
+ return rc;
+
+err_free_net:
+ put_net(pd->net);
+err_free_pd:
+ kfree(pd);
+ goto out;
+}
+
+static int l2tp_dfs_seq_release(struct inode *inode, struct file *file)
+{
+ struct l2tp_dfs_seq_data *pd;
+ struct seq_file *seq;
+
+ seq = file->private_data;
+ pd = seq->private;
+ if (pd->net)
+ put_net(pd->net);
+ kfree(pd);
+ seq_release(inode, file);
+
+ return 0;
+}
+
+static const struct file_operations l2tp_dfs_fops = {
+ .owner = THIS_MODULE,
+ .open = l2tp_dfs_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = l2tp_dfs_seq_release,
+};
+
+static int __init l2tp_debugfs_init(void)
+{
+ int rc = 0;
+
+ rootdir = debugfs_create_dir("l2tp", NULL);
+ if (IS_ERR(rootdir)) {
+ rc = PTR_ERR(rootdir);
+ rootdir = NULL;
+ goto out;
+ }
+
+ tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
+ if (tunnels == NULL)
+ rc = -EIO;
+
+ printk(KERN_INFO "L2TP debugfs support\n");
+
+out:
+ if (rc)
+ printk(KERN_WARNING "l2tp debugfs: unable to init\n");
+
+ return rc;
+}
+
+static void __exit l2tp_debugfs_exit(void)
+{
+ debugfs_remove(tunnels);
+ debugfs_remove(rootdir);
+}
+
+module_init(l2tp_debugfs_init);
+module_exit(l2tp_debugfs_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
+MODULE_DESCRIPTION("L2TP debugfs driver");
+MODULE_VERSION("1.0");
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_eth.c b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_eth.c
new file mode 100644
index 0000000..ab9a293
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_eth.c
@@ -0,0 +1,336 @@
+/*
+ * L2TPv3 ethernet pseudowire driver
+ *
+ * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/hash.h>
+#include <linux/l2tp.h>
+#include <linux/in.h>
+#include <linux/etherdevice.h>
+#include <linux/spinlock.h>
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/inet_common.h>
+#include <net/inet_hashtables.h>
+#include <net/tcp_states.h>
+#include <net/protocol.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+#include "l2tp_core.h"
+
+/* Default device name. May be overridden by name specified by user */
+#define L2TP_ETH_DEV_NAME "l2tpeth%d"
+
+/* via netdev_priv() */
+struct l2tp_eth {
+ struct net_device *dev;
+ struct sock *tunnel_sock;
+ struct l2tp_session *session;
+ struct list_head list;
+};
+
+/* via l2tp_session_priv() */
+struct l2tp_eth_sess {
+ struct net_device *dev;
+};
+
+/* per-net private data for this module */
+static unsigned int l2tp_eth_net_id;
+struct l2tp_eth_net {
+ struct list_head l2tp_eth_dev_list;
+ spinlock_t l2tp_eth_lock;
+};
+
+static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
+{
+ return net_generic(net, l2tp_eth_net_id);
+}
+
+static int l2tp_eth_dev_init(struct net_device *dev)
+{
+ struct l2tp_eth *priv = netdev_priv(dev);
+
+ priv->dev = dev;
+ eth_hw_addr_random(dev);
+ memset(&dev->broadcast[0], 0xff, 6);
+
+ return 0;
+}
+
+static void l2tp_eth_dev_uninit(struct net_device *dev)
+{
+ struct l2tp_eth *priv = netdev_priv(dev);
+ struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
+
+ spin_lock(&pn->l2tp_eth_lock);
+ list_del_init(&priv->list);
+ spin_unlock(&pn->l2tp_eth_lock);
+ dev_put(dev);
+}
+
+static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct l2tp_eth *priv = netdev_priv(dev);
+ struct l2tp_session *session = priv->session;
+
+ l2tp_xmit_skb(session, skb, session->hdr_len);
+
+ dev->stats.tx_bytes += skb->len;
+ dev->stats.tx_packets++;
+
+ return 0;
+}
+
+static struct net_device_ops l2tp_eth_netdev_ops = {
+ .ndo_init = l2tp_eth_dev_init,
+ .ndo_uninit = l2tp_eth_dev_uninit,
+ .ndo_start_xmit = l2tp_eth_dev_xmit,
+};
+
+static void l2tp_eth_dev_setup(struct net_device *dev)
+{
+ ether_setup(dev);
+ dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ dev->netdev_ops = &l2tp_eth_netdev_ops;
+ dev->destructor = free_netdev;
+}
+
+static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
+{
+ struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
+ struct net_device *dev = spriv->dev;
+
+ if (session->debug & L2TP_MSG_DATA) {
+ unsigned int length;
+ int offset;
+ u8 *ptr = skb->data;
+
+ length = min(32u, skb->len);
+ if (!pskb_may_pull(skb, length))
+ goto error;
+
+ printk(KERN_DEBUG "%s: eth recv: ", session->name);
+
+ offset = 0;
+ do {
+ printk(" %02X", ptr[offset]);
+ } while (++offset < length);
+
+ printk("\n");
+ }
+
+ if (!pskb_may_pull(skb, ETH_HLEN))
+ goto error;
+
+ secpath_reset(skb);
+
+ /* checksums verified by L2TP */
+ skb->ip_summed = CHECKSUM_NONE;
+
+ skb_dst_drop(skb);
+ nf_reset(skb);
+
+ if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += data_len;
+ } else
+ dev->stats.rx_errors++;
+
+ return;
+
+error:
+ dev->stats.rx_errors++;
+ kfree_skb(skb);
+}
+
+static void l2tp_eth_delete(struct l2tp_session *session)
+{
+ struct l2tp_eth_sess *spriv;
+ struct net_device *dev;
+
+ if (session) {
+ spriv = l2tp_session_priv(session);
+ dev = spriv->dev;
+ if (dev) {
+ unregister_netdev(dev);
+ spriv->dev = NULL;
+ module_put(THIS_MODULE);
+ }
+ }
+}
+
+#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
+static void l2tp_eth_show(struct seq_file *m, void *arg)
+{
+ struct l2tp_session *session = arg;
+ struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
+ struct net_device *dev = spriv->dev;
+
+ seq_printf(m, " interface %s\n", dev->name);
+}
+#endif
+
+static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
+{
+ struct net_device *dev;
+ char name[IFNAMSIZ];
+ struct l2tp_tunnel *tunnel;
+ struct l2tp_session *session;
+ struct l2tp_eth *priv;
+ struct l2tp_eth_sess *spriv;
+ int rc;
+ struct l2tp_eth_net *pn;
+
+ tunnel = l2tp_tunnel_find(net, tunnel_id);
+ if (!tunnel) {
+ rc = -ENODEV;
+ goto out;
+ }
+
+ session = l2tp_session_find(net, tunnel, session_id);
+ if (session) {
+ rc = -EEXIST;
+ goto out;
+ }
+
+ if (cfg->ifname) {
+ dev = dev_get_by_name(net, cfg->ifname);
+ if (dev) {
+ dev_put(dev);
+ rc = -EEXIST;
+ goto out;
+ }
+ strlcpy(name, cfg->ifname, IFNAMSIZ);
+ } else
+ strcpy(name, L2TP_ETH_DEV_NAME);
+
+ session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
+ peer_session_id, cfg);
+ if (!session) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup);
+ if (!dev) {
+ rc = -ENOMEM;
+ goto out_del_session;
+ }
+
+ dev_net_set(dev, net);
+ if (session->mtu == 0)
+ session->mtu = dev->mtu - session->hdr_len;
+ dev->mtu = session->mtu;
+ dev->needed_headroom += session->hdr_len;
+
+ priv = netdev_priv(dev);
+ priv->dev = dev;
+ priv->session = session;
+ INIT_LIST_HEAD(&priv->list);
+
+ priv->tunnel_sock = tunnel->sock;
+ session->recv_skb = l2tp_eth_dev_recv;
+ session->session_close = l2tp_eth_delete;
+#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
+ session->show = l2tp_eth_show;
+#endif
+
+ spriv = l2tp_session_priv(session);
+ spriv->dev = dev;
+
+ rc = register_netdev(dev);
+ if (rc < 0)
+ goto out_del_dev;
+
+ __module_get(THIS_MODULE);
+ /* Must be done after register_netdev() */
+ strlcpy(session->ifname, dev->name, IFNAMSIZ);
+
+ dev_hold(dev);
+ pn = l2tp_eth_pernet(dev_net(dev));
+ spin_lock(&pn->l2tp_eth_lock);
+ list_add(&priv->list, &pn->l2tp_eth_dev_list);
+ spin_unlock(&pn->l2tp_eth_lock);
+
+ return 0;
+
+out_del_dev:
+ free_netdev(dev);
+ spriv->dev = NULL;
+out_del_session:
+ l2tp_session_delete(session);
+out:
+ return rc;
+}
+
+static __net_init int l2tp_eth_init_net(struct net *net)
+{
+ struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
+
+ INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
+ spin_lock_init(&pn->l2tp_eth_lock);
+
+ return 0;
+}
+
+static struct pernet_operations l2tp_eth_net_ops = {
+ .init = l2tp_eth_init_net,
+ .id = &l2tp_eth_net_id,
+ .size = sizeof(struct l2tp_eth_net),
+};
+
+
+static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
+ .session_create = l2tp_eth_create,
+ .session_delete = l2tp_session_delete,
+};
+
+
+static int __init l2tp_eth_init(void)
+{
+ int err = 0;
+
+ err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
+ if (err)
+ goto out;
+
+ err = register_pernet_device(&l2tp_eth_net_ops);
+ if (err)
+ goto out_unreg;
+
+ printk(KERN_INFO "L2TP ethernet pseudowire support (L2TPv3)\n");
+
+ return 0;
+
+out_unreg:
+ l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
+out:
+ return err;
+}
+
+static void __exit l2tp_eth_exit(void)
+{
+ unregister_pernet_device(&l2tp_eth_net_ops);
+ l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
+}
+
+module_init(l2tp_eth_init);
+module_exit(l2tp_eth_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
+MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
+MODULE_VERSION("1.0");
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_ip.c b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_ip.c
new file mode 100755
index 0000000..f54fa99
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_ip.c
@@ -0,0 +1,717 @@
+/*
+ * L2TPv3 IP encapsulation support
+ *
+ * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/icmp.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/random.h>
+#include <linux/socket.h>
+#include <linux/l2tp.h>
+#include <linux/in.h>
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/inet_common.h>
+#include <net/inet_hashtables.h>
+#include <net/tcp_states.h>
+#include <net/protocol.h>
+#include <net/xfrm.h>
+
+#include "l2tp_core.h"
+
+struct l2tp_ip_sock {
+ /* inet_sock has to be the first member of l2tp_ip_sock */
+ struct inet_sock inet;
+
+ __u32 conn_id;
+ __u32 peer_conn_id;
+
+ __u64 tx_packets;
+ __u64 tx_bytes;
+ __u64 tx_errors;
+ __u64 rx_packets;
+ __u64 rx_bytes;
+ __u64 rx_errors;
+};
+
+static DEFINE_RWLOCK(l2tp_ip_lock);
+static struct hlist_head l2tp_ip_table;
+static struct hlist_head l2tp_ip_bind_table;
+
+static inline struct l2tp_ip_sock *l2tp_ip_sk(const struct sock *sk)
+{
+ return (struct l2tp_ip_sock *)sk;
+}
+
+static struct sock *__l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id)
+{
+ struct hlist_node *node;
+ struct sock *sk;
+
+ sk_for_each_bound(sk, node, &l2tp_ip_bind_table) {
+ struct inet_sock *inet = inet_sk(sk);
+ struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk);
+
+ if (l2tp == NULL)
+ continue;
+
+ if ((l2tp->conn_id == tunnel_id) &&
+ net_eq(sock_net(sk), net) &&
+ !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
+ !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
+ goto found;
+ }
+
+ sk = NULL;
+found:
+ return sk;
+}
+
+static inline struct sock *l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id)
+{
+ struct sock *sk = __l2tp_ip_bind_lookup(net, laddr, dif, tunnel_id);
+ if (sk)
+ sock_hold(sk);
+
+ return sk;
+}
+
+/* When processing receive frames, there are two cases to
+ * consider. Data frames consist of a non-zero session-id and an
+ * optional cookie. Control frames consist of a regular L2TP header
+ * preceded by 32-bits of zeros.
+ *
+ * L2TPv3 Session Header Over IP
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Session ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Cookie (optional, maximum 64 bits)...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * L2TPv3 Control Message Header Over IP
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | (32 bits of zeros) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Control Connection ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ns | Nr |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * All control frames are passed to userspace.
+ */
+static int l2tp_ip_recv(struct sk_buff *skb)
+{
+ struct sock *sk;
+ u32 session_id;
+ u32 tunnel_id;
+ unsigned char *ptr, *optr;
+ struct l2tp_session *session;
+ struct l2tp_tunnel *tunnel = NULL;
+ int length;
+ int offset;
+
+ /* Point to L2TP header */
+ optr = ptr = skb->data;
+
+ if (!pskb_may_pull(skb, 4))
+ goto discard;
+
+ session_id = ntohl(*((__be32 *) ptr));
+ ptr += 4;
+
+ /* RFC3931: L2TP/IP packets have the first 4 bytes containing
+ * the session_id. If it is 0, the packet is a L2TP control
+ * frame and the session_id value can be discarded.
+ */
+ if (session_id == 0) {
+ __skb_pull(skb, 4);
+ goto pass_up;
+ }
+
+ /* Ok, this is a data packet. Lookup the session. */
+ session = l2tp_session_find(&init_net, NULL, session_id);
+ if (session == NULL)
+ goto discard;
+
+ tunnel = session->tunnel;
+ if (tunnel == NULL)
+ goto discard;
+
+ /* Trace packet contents, if enabled */
+ if (tunnel->debug & L2TP_MSG_DATA) {
+ length = min(32u, skb->len);
+ if (!pskb_may_pull(skb, length))
+ goto discard;
+
+ printk(KERN_DEBUG "%s: ip recv: ", tunnel->name);
+
+ offset = 0;
+ do {
+ printk(" %02X", ptr[offset]);
+ } while (++offset < length);
+
+ printk("\n");
+ }
+
+ l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook);
+
+ return 0;
+
+pass_up:
+ /* Get the tunnel_id from the L2TP header */
+ if (!pskb_may_pull(skb, 12))
+ goto discard;
+
+ if ((skb->data[0] & 0xc0) != 0xc0)
+ goto discard;
+
+ tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
+ tunnel = l2tp_tunnel_find(&init_net, tunnel_id);
+ if (tunnel != NULL)
+ sk = tunnel->sock;
+ else {
+ struct iphdr *iph = (struct iphdr *) skb_network_header(skb);
+
+ read_lock_bh(&l2tp_ip_lock);
+ sk = __l2tp_ip_bind_lookup(&init_net, iph->daddr, 0, tunnel_id);
+ read_unlock_bh(&l2tp_ip_lock);
+ }
+
+ if (sk == NULL)
+ goto discard;
+
+ sock_hold(sk);
+
+ if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
+ goto discard_put;
+
+ nf_reset(skb);
+
+ return sk_receive_skb(sk, skb, 1);
+
+discard_put:
+ sock_put(sk);
+
+discard:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int l2tp_ip_open(struct sock *sk)
+{
+ /* Prevent autobind. We don't have ports. */
+ inet_sk(sk)->inet_num = IPPROTO_L2TP;
+
+ write_lock_bh(&l2tp_ip_lock);
+ sk_add_node(sk, &l2tp_ip_table);
+ write_unlock_bh(&l2tp_ip_lock);
+
+ return 0;
+}
+
+static void l2tp_ip_close(struct sock *sk, long timeout)
+{
+ write_lock_bh(&l2tp_ip_lock);
+ hlist_del_init(&sk->sk_bind_node);
+ sk_del_node_init(sk);
+ write_unlock_bh(&l2tp_ip_lock);
+ sk_common_release(sk);
+}
+
+static void l2tp_ip_destroy_sock(struct sock *sk)
+{
+ struct sk_buff *skb;
+
+ while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
+ kfree_skb(skb);
+
+ sk_refcnt_debug_dec(sk);
+}
+
+static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
+ int ret;
+ int chk_addr_ret;
+
+ if (addr_len < sizeof(struct sockaddr_l2tpip))
+ return -EINVAL;
+ if (addr->l2tp_family != AF_INET)
+ return -EINVAL;
+
+ ret = -EADDRINUSE;
+ read_lock_bh(&l2tp_ip_lock);
+ if (__l2tp_ip_bind_lookup(&init_net, addr->l2tp_addr.s_addr, sk->sk_bound_dev_if, addr->l2tp_conn_id))
+ goto out_in_use;
+
+ read_unlock_bh(&l2tp_ip_lock);
+
+ lock_sock(sk);
+ //hubÖÎÀí£ºCVE-2016-10200
+ if (!sock_flag(sk, SOCK_ZAPPED))
+ goto out;
+ if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip))
+ goto out;
+
+ chk_addr_ret = inet_addr_type(&init_net, addr->l2tp_addr.s_addr);
+ ret = -EADDRNOTAVAIL;
+ if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
+ chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
+ goto out;
+
+ if (addr->l2tp_addr.s_addr)
+ inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
+ if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
+ inet->inet_saddr = 0; /* Use device */
+ sk_dst_reset(sk);
+
+ l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id;
+
+ write_lock_bh(&l2tp_ip_lock);
+ sk_add_bind_node(sk, &l2tp_ip_bind_table);
+ sk_del_node_init(sk);
+ write_unlock_bh(&l2tp_ip_lock);
+ ret = 0;
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+out:
+ release_sock(sk);
+
+ return ret;
+
+out_in_use:
+ read_unlock_bh(&l2tp_ip_lock);
+
+ return ret;
+}
+
+static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr;
+ struct inet_sock *inet = inet_sk(sk);
+ struct flowi4 *fl4;
+ struct rtable *rt;
+ __be32 saddr;
+ int oif, rc;
+
+ if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
+ return -EINVAL;
+
+ if (addr_len < sizeof(*lsa))
+ return -EINVAL;
+
+ if (lsa->l2tp_family != AF_INET)
+ return -EAFNOSUPPORT;
+
+ lock_sock(sk);
+
+ sk_dst_reset(sk);
+
+ oif = sk->sk_bound_dev_if;
+ saddr = inet->inet_saddr;
+
+ rc = -EINVAL;
+ if (ipv4_is_multicast(lsa->l2tp_addr.s_addr))
+ goto out;
+
+ fl4 = &inet->cork.fl.u.ip4;
+ rt = ip_route_connect(fl4, lsa->l2tp_addr.s_addr, saddr,
+ RT_CONN_FLAGS(sk), oif,
+ IPPROTO_L2TP,
+ 0, 0, sk, true);
+ if (IS_ERR(rt)) {
+ rc = PTR_ERR(rt);
+ if (rc == -ENETUNREACH)
+ IP_INC_STATS_BH(&init_net, IPSTATS_MIB_OUTNOROUTES);
+ goto out;
+ }
+
+ rc = -ENETUNREACH;
+ if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
+ ip_rt_put(rt);
+ goto out;
+ }
+
+ l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
+
+ if (!inet->inet_saddr)
+ inet->inet_saddr = fl4->saddr;
+ if (!inet->inet_rcv_saddr)
+ inet->inet_rcv_saddr = fl4->saddr;
+ inet->inet_daddr = fl4->daddr;
+ sk->sk_state = TCP_ESTABLISHED;
+ inet->inet_id = jiffies;
+
+ sk_dst_set(sk, &rt->dst);
+
+ write_lock_bh(&l2tp_ip_lock);
+ hlist_del_init(&sk->sk_bind_node);
+ sk_add_bind_node(sk, &l2tp_ip_bind_table);
+ write_unlock_bh(&l2tp_ip_lock);
+
+ rc = 0;
+out:
+ release_sock(sk);
+ return rc;
+}
+
+static int l2tp_ip_disconnect(struct sock *sk, int flags)
+{
+ if (sock_flag(sk, SOCK_ZAPPED))
+ return 0;
+
+ return udp_disconnect(sk, flags);
+}
+
+static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr,
+ int *uaddr_len, int peer)
+{
+ struct sock *sk = sock->sk;
+ struct inet_sock *inet = inet_sk(sk);
+ struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk);
+ struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr;
+
+ memset(lsa, 0, sizeof(*lsa));
+ lsa->l2tp_family = AF_INET;
+ if (peer) {
+ if (!inet->inet_dport)
+ return -ENOTCONN;
+ lsa->l2tp_conn_id = lsk->peer_conn_id;
+ lsa->l2tp_addr.s_addr = inet->inet_daddr;
+ } else {
+ __be32 addr = inet->inet_rcv_saddr;
+ if (!addr)
+ addr = inet->inet_saddr;
+ lsa->l2tp_conn_id = lsk->conn_id;
+ lsa->l2tp_addr.s_addr = addr;
+ }
+ *uaddr_len = sizeof(*lsa);
+ return 0;
+}
+
+static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb)
+{
+ int rc;
+
+ /* Charge it to the socket, dropping if the queue is full. */
+ rc = sock_queue_rcv_skb(sk, skb);
+ if (rc < 0)
+ goto drop;
+
+ return 0;
+
+drop:
+ IP_INC_STATS(&init_net, IPSTATS_MIB_INDISCARDS);
+ kfree_skb(skb);
+ return -1;
+}
+
+/* Userspace will call sendmsg() on the tunnel socket to send L2TP
+ * control frames.
+ */
+static int l2tp_ip_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len)
+{
+ struct sk_buff *skb;
+ int rc;
+ struct l2tp_ip_sock *lsa = l2tp_ip_sk(sk);
+ struct inet_sock *inet = inet_sk(sk);
+ struct rtable *rt = NULL;
+ struct flowi4 *fl4;
+ int connected = 0;
+ __be32 daddr;
+
+ lock_sock(sk);
+
+ rc = -ENOTCONN;
+ if (sock_flag(sk, SOCK_DEAD))
+ goto out;
+
+ /* Get and verify the address. */
+ if (msg->msg_name) {
+ struct sockaddr_l2tpip *lip = (struct sockaddr_l2tpip *) msg->msg_name;
+ rc = -EINVAL;
+ if (msg->msg_namelen < sizeof(*lip))
+ goto out;
+
+ if (lip->l2tp_family != AF_INET) {
+ rc = -EAFNOSUPPORT;
+ if (lip->l2tp_family != AF_UNSPEC)
+ goto out;
+ }
+
+ daddr = lip->l2tp_addr.s_addr;
+ } else {
+ rc = -EDESTADDRREQ;
+ if (sk->sk_state != TCP_ESTABLISHED)
+ goto out;
+
+ daddr = inet->inet_daddr;
+ connected = 1;
+ }
+
+ /* Allocate a socket buffer */
+ rc = -ENOMEM;
+ skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) +
+ 4 + len, 0, GFP_KERNEL);
+ if (!skb)
+ goto error;
+
+ /* Reserve space for headers, putting IP header on 4-byte boundary. */
+ skb_reserve(skb, 2 + NET_SKB_PAD);
+ skb_reset_network_header(skb);
+ skb_reserve(skb, sizeof(struct iphdr));
+ skb_reset_transport_header(skb);
+
+ /* Insert 0 session_id */
+ *((__be32 *) skb_put(skb, 4)) = 0;
+
+ /* Copy user data into skb */
+ rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
+ if (rc < 0) {
+ kfree_skb(skb);
+ goto error;
+ }
+
+ fl4 = &inet->cork.fl.u.ip4;
+ if (connected)
+ rt = (struct rtable *) __sk_dst_check(sk, 0);
+
+ rcu_read_lock();
+ if (rt == NULL) {
+ const struct ip_options_rcu *inet_opt;
+
+ inet_opt = rcu_dereference(inet->inet_opt);
+
+ /* Use correct destination address if we have options. */
+ if (inet_opt && inet_opt->opt.srr)
+ daddr = inet_opt->opt.faddr;
+
+ /* If this fails, retransmit mechanism of transport layer will
+ * keep trying until route appears or the connection times
+ * itself out.
+ */
+ rt = ip_route_output_ports(sock_net(sk), fl4, sk,
+ daddr, inet->inet_saddr,
+ inet->inet_dport, inet->inet_sport,
+ sk->sk_protocol, RT_CONN_FLAGS(sk),
+ sk->sk_bound_dev_if);
+ if (IS_ERR(rt))
+ goto no_route;
+ if (connected) {
+ sk_setup_caps(sk, &rt->dst);
+ } else {
+ skb_dst_set(skb, &rt->dst);
+ goto xmit;
+ }
+ }
+
+ /* We dont need to clone dst here, it is guaranteed to not disappear.
+ * __dev_xmit_skb() might force a refcount if needed.
+ */
+ skb_dst_set_noref(skb, &rt->dst);
+
+xmit:
+ /* Queue the packet to IP for output */
+ rc = ip_queue_xmit(skb, &inet->cork.fl);
+ rcu_read_unlock();
+
+error:
+ /* Update stats */
+ if (rc >= 0) {
+ lsa->tx_packets++;
+ lsa->tx_bytes += len;
+ rc = len;
+ } else {
+ lsa->tx_errors++;
+ }
+
+out:
+ release_sock(sk);
+ return rc;
+
+no_route:
+ rcu_read_unlock();
+ IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
+ kfree_skb(skb);
+ rc = -EHOSTUNREACH;
+ goto out;
+}
+
+static int l2tp_ip_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
+ size_t len, int noblock, int flags, int *addr_len)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk);
+ size_t copied = 0;
+ int err = -EOPNOTSUPP;
+ struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
+ struct sk_buff *skb;
+
+ if (flags & MSG_OOB)
+ goto out;
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb)
+ goto out;
+
+ copied = skb->len;
+ if (len < copied) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+ if (err)
+ goto done;
+
+ sock_recv_timestamp(msg, sk, skb);
+
+ /* Copy the address. */
+ if (sin) {
+ sin->sin_family = AF_INET;
+ sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+ sin->sin_port = 0;
+ memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
+ *addr_len = sizeof(*sin);
+ }
+ if (inet->cmsg_flags)
+ ip_cmsg_recv(msg, skb);
+ if (flags & MSG_TRUNC)
+ copied = skb->len;
+done:
+ skb_free_datagram(sk, skb);
+out:
+ if (err) {
+ lsk->rx_errors++;
+ return err;
+ }
+
+ lsk->rx_packets++;
+ lsk->rx_bytes += copied;
+
+ return copied;
+}
+
+static struct proto l2tp_ip_prot = {
+ .name = "L2TP/IP",
+ .owner = THIS_MODULE,
+ .init = l2tp_ip_open,
+ .close = l2tp_ip_close,
+ .bind = l2tp_ip_bind,
+ .connect = l2tp_ip_connect,
+ .disconnect = l2tp_ip_disconnect,
+ .ioctl = udp_ioctl,
+ .destroy = l2tp_ip_destroy_sock,
+ .setsockopt = ip_setsockopt,
+ .getsockopt = ip_getsockopt,
+ .sendmsg = l2tp_ip_sendmsg,
+ .recvmsg = l2tp_ip_recvmsg,
+ .backlog_rcv = l2tp_ip_backlog_recv,
+ .hash = inet_hash,
+ .unhash = inet_unhash,
+ .obj_size = sizeof(struct l2tp_ip_sock),
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_ip_setsockopt,
+ .compat_getsockopt = compat_ip_getsockopt,
+#endif
+};
+
+static const struct proto_ops l2tp_ip_ops = {
+ .family = PF_INET,
+ .owner = THIS_MODULE,
+ .release = inet_release,
+ .bind = inet_bind,
+ .connect = inet_dgram_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = l2tp_ip_getname,
+ .poll = datagram_poll,
+ .ioctl = inet_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = inet_shutdown,
+ .setsockopt = sock_common_setsockopt,
+ .getsockopt = sock_common_getsockopt,
+ .sendmsg = inet_sendmsg,
+ .recvmsg = sock_common_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
+
+static struct inet_protosw l2tp_ip_protosw = {
+ .type = SOCK_DGRAM,
+ .protocol = IPPROTO_L2TP,
+ .prot = &l2tp_ip_prot,
+ .ops = &l2tp_ip_ops,
+ .no_check = 0,
+};
+
+static struct net_protocol l2tp_ip_protocol __read_mostly = {
+ .handler = l2tp_ip_recv,
+};
+
+static int __init l2tp_ip_init(void)
+{
+ int err;
+
+ printk(KERN_INFO "L2TP IP encapsulation support (L2TPv3)\n");
+
+ err = proto_register(&l2tp_ip_prot, 1);
+ if (err != 0)
+ goto out;
+
+ err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP);
+ if (err)
+ goto out1;
+
+ inet_register_protosw(&l2tp_ip_protosw);
+ return 0;
+
+out1:
+ proto_unregister(&l2tp_ip_prot);
+out:
+ return err;
+}
+
+static void __exit l2tp_ip_exit(void)
+{
+ inet_unregister_protosw(&l2tp_ip_protosw);
+ inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP);
+ proto_unregister(&l2tp_ip_prot);
+}
+
+module_init(l2tp_ip_init);
+module_exit(l2tp_ip_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
+MODULE_DESCRIPTION("L2TP over IP");
+MODULE_VERSION("1.0");
+
+/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
+ * enums
+ */
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP);
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_netlink.c b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_netlink.c
new file mode 100644
index 0000000..93a41a0
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_netlink.c
@@ -0,0 +1,841 @@
+/*
+ * L2TP netlink layer, for management
+ *
+ * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
+ *
+ * Partly based on the IrDA nelink implementation
+ * (see net/irda/irnetlink.c) which is:
+ * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
+ * which is in turn partly based on the wireless netlink code:
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <net/sock.h>
+#include <net/genetlink.h>
+#include <net/udp.h>
+#include <linux/in.h>
+#include <linux/udp.h>
+#include <linux/socket.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <net/net_namespace.h>
+
+#include <linux/l2tp.h>
+
+#include "l2tp_core.h"
+
+
+static struct genl_family l2tp_nl_family = {
+ .id = GENL_ID_GENERATE,
+ .name = L2TP_GENL_NAME,
+ .version = L2TP_GENL_VERSION,
+ .hdrsize = 0,
+ .maxattr = L2TP_ATTR_MAX,
+};
+
+/* Accessed under genl lock */
+static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
+
+static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
+{
+ u32 tunnel_id;
+ u32 session_id;
+ char *ifname;
+ struct l2tp_tunnel *tunnel;
+ struct l2tp_session *session = NULL;
+ struct net *net = genl_info_net(info);
+
+ if (info->attrs[L2TP_ATTR_IFNAME]) {
+ ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
+ session = l2tp_session_find_by_ifname(net, ifname);
+ } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
+ (info->attrs[L2TP_ATTR_CONN_ID])) {
+ tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
+ session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
+ tunnel = l2tp_tunnel_find(net, tunnel_id);
+ if (tunnel)
+ session = l2tp_session_find(net, tunnel, session_id);
+ }
+
+ return session;
+}
+
+static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *msg;
+ void *hdr;
+ int ret = -ENOBUFS;
+
+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!msg) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
+ &l2tp_nl_family, 0, L2TP_CMD_NOOP);
+ if (IS_ERR(hdr)) {
+ ret = PTR_ERR(hdr);
+ goto err_out;
+ }
+
+ genlmsg_end(msg, hdr);
+
+ return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
+
+err_out:
+ nlmsg_free(msg);
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
+{
+ u32 tunnel_id;
+ u32 peer_tunnel_id;
+ int proto_version;
+ int fd;
+ int ret = 0;
+ struct l2tp_tunnel_cfg cfg = { 0, };
+ struct l2tp_tunnel *tunnel;
+ struct net *net = genl_info_net(info);
+
+ if (!info->attrs[L2TP_ATTR_CONN_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
+
+ if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
+
+ if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
+
+ if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
+
+ fd = -1;
+ if (info->attrs[L2TP_ATTR_FD]) {
+ fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
+ } else {
+ if (info->attrs[L2TP_ATTR_IP_SADDR])
+ cfg.local_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_SADDR]);
+ if (info->attrs[L2TP_ATTR_IP_DADDR])
+ cfg.peer_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_DADDR]);
+ if (info->attrs[L2TP_ATTR_UDP_SPORT])
+ cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
+ if (info->attrs[L2TP_ATTR_UDP_DPORT])
+ cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
+ if (info->attrs[L2TP_ATTR_UDP_CSUM])
+ cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
+ }
+
+ if (info->attrs[L2TP_ATTR_DEBUG])
+ cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
+
+ tunnel = l2tp_tunnel_find(net, tunnel_id);
+ if (tunnel != NULL) {
+ ret = -EEXIST;
+ goto out;
+ }
+
+ ret = -EINVAL;
+ switch (cfg.encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ case L2TP_ENCAPTYPE_IP:
+ ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
+ peer_tunnel_id, &cfg, &tunnel);
+ break;
+ }
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
+{
+ struct l2tp_tunnel *tunnel;
+ u32 tunnel_id;
+ int ret = 0;
+ struct net *net = genl_info_net(info);
+
+ if (!info->attrs[L2TP_ATTR_CONN_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
+
+ tunnel = l2tp_tunnel_find(net, tunnel_id);
+ if (tunnel == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ (void) l2tp_tunnel_delete(tunnel);
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
+{
+ struct l2tp_tunnel *tunnel;
+ u32 tunnel_id;
+ int ret = 0;
+ struct net *net = genl_info_net(info);
+
+ if (!info->attrs[L2TP_ATTR_CONN_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
+
+ tunnel = l2tp_tunnel_find(net, tunnel_id);
+ if (tunnel == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (info->attrs[L2TP_ATTR_DEBUG])
+ tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
+ struct l2tp_tunnel *tunnel)
+{
+ void *hdr;
+ struct nlattr *nest;
+ struct sock *sk = NULL;
+ struct inet_sock *inet;
+
+ hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags,
+ L2TP_CMD_TUNNEL_GET);
+ if (IS_ERR(hdr))
+ return PTR_ERR(hdr);
+
+ NLA_PUT_U8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version);
+ NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id);
+ NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id);
+ NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, tunnel->debug);
+ NLA_PUT_U16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap);
+
+ nest = nla_nest_start(skb, L2TP_ATTR_STATS);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, tunnel->stats.tx_packets);
+ NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, tunnel->stats.tx_bytes);
+ NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, tunnel->stats.tx_errors);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, tunnel->stats.rx_packets);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, tunnel->stats.rx_bytes);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, tunnel->stats.rx_seq_discards);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, tunnel->stats.rx_oos_packets);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, tunnel->stats.rx_errors);
+ nla_nest_end(skb, nest);
+
+ sk = tunnel->sock;
+ if (!sk)
+ goto out;
+
+ inet = inet_sk(sk);
+
+ switch (tunnel->encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ NLA_PUT_U16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport));
+ NLA_PUT_U16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport));
+ NLA_PUT_U8(skb, L2TP_ATTR_UDP_CSUM, (sk->sk_no_check != UDP_CSUM_NOXMIT));
+ /* NOBREAK */
+ case L2TP_ENCAPTYPE_IP:
+ NLA_PUT_BE32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr);
+ NLA_PUT_BE32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr);
+ break;
+ }
+
+out:
+ return genlmsg_end(skb, hdr);
+
+nla_put_failure:
+ genlmsg_cancel(skb, hdr);
+ return -1;
+}
+
+static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct l2tp_tunnel *tunnel;
+ struct sk_buff *msg;
+ u32 tunnel_id;
+ int ret = -ENOBUFS;
+ struct net *net = genl_info_net(info);
+
+ if (!info->attrs[L2TP_ATTR_CONN_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
+
+ tunnel = l2tp_tunnel_find(net, tunnel_id);
+ if (tunnel == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!msg) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq,
+ NLM_F_ACK, tunnel);
+ if (ret < 0)
+ goto err_out;
+
+ return genlmsg_unicast(net, msg, info->snd_pid);
+
+err_out:
+ nlmsg_free(msg);
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int ti = cb->args[0];
+ struct l2tp_tunnel *tunnel;
+ struct net *net = sock_net(skb->sk);
+
+ for (;;) {
+ tunnel = l2tp_tunnel_find_nth(net, ti);
+ if (tunnel == NULL)
+ goto out;
+
+ if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ tunnel) <= 0)
+ goto out;
+
+ ti++;
+ }
+
+out:
+ cb->args[0] = ti;
+
+ return skb->len;
+}
+
+static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
+{
+ u32 tunnel_id = 0;
+ u32 session_id;
+ u32 peer_session_id;
+ int ret = 0;
+ struct l2tp_tunnel *tunnel;
+ struct l2tp_session *session;
+ struct l2tp_session_cfg cfg = { 0, };
+ struct net *net = genl_info_net(info);
+
+ if (!info->attrs[L2TP_ATTR_CONN_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
+ tunnel = l2tp_tunnel_find(net, tunnel_id);
+ if (!tunnel) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
+ session = l2tp_session_find(net, tunnel, session_id);
+ if (session) {
+ ret = -EEXIST;
+ goto out;
+ }
+
+ if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
+
+ if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
+ if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (tunnel->version > 2) {
+ if (info->attrs[L2TP_ATTR_OFFSET])
+ cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
+
+ if (info->attrs[L2TP_ATTR_DATA_SEQ])
+ cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
+
+ cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
+ if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
+ cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
+
+ cfg.l2specific_len = 4;
+ if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
+ cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
+
+ if (info->attrs[L2TP_ATTR_COOKIE]) {
+ u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
+ if (len > 8) {
+ ret = -EINVAL;
+ goto out;
+ }
+ cfg.cookie_len = len;
+ memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
+ }
+ if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
+ u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
+ if (len > 8) {
+ ret = -EINVAL;
+ goto out;
+ }
+ cfg.peer_cookie_len = len;
+ memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
+ }
+ if (info->attrs[L2TP_ATTR_IFNAME])
+ cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
+
+ if (info->attrs[L2TP_ATTR_VLAN_ID])
+ cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
+ }
+
+ if (info->attrs[L2TP_ATTR_DEBUG])
+ cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
+
+ if (info->attrs[L2TP_ATTR_RECV_SEQ])
+ cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
+
+ if (info->attrs[L2TP_ATTR_SEND_SEQ])
+ cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
+
+ if (info->attrs[L2TP_ATTR_LNS_MODE])
+ cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
+
+ if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
+ cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
+
+ if (info->attrs[L2TP_ATTR_MTU])
+ cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
+
+ if (info->attrs[L2TP_ATTR_MRU])
+ cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
+
+ if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
+ (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
+ ret = -EPROTONOSUPPORT;
+ goto out;
+ }
+
+ /* Check that pseudowire-specific params are present */
+ switch (cfg.pw_type) {
+ case L2TP_PWTYPE_NONE:
+ break;
+ case L2TP_PWTYPE_ETH_VLAN:
+ if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
+ ret = -EINVAL;
+ goto out;
+ }
+ break;
+ case L2TP_PWTYPE_ETH:
+ break;
+ case L2TP_PWTYPE_PPP:
+ case L2TP_PWTYPE_PPP_AC:
+ break;
+ case L2TP_PWTYPE_IP:
+ default:
+ ret = -EPROTONOSUPPORT;
+ break;
+ }
+
+ ret = -EPROTONOSUPPORT;
+ if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
+ ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
+ session_id, peer_session_id, &cfg);
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
+{
+ int ret = 0;
+ struct l2tp_session *session;
+ u16 pw_type;
+
+ session = l2tp_nl_session_find(info);
+ if (session == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ pw_type = session->pwtype;
+ if (pw_type < __L2TP_PWTYPE_MAX)
+ if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
+ ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
+{
+ int ret = 0;
+ struct l2tp_session *session;
+
+ session = l2tp_nl_session_find(info);
+ if (session == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (info->attrs[L2TP_ATTR_DEBUG])
+ session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
+
+ if (info->attrs[L2TP_ATTR_DATA_SEQ])
+ session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
+
+ if (info->attrs[L2TP_ATTR_RECV_SEQ])
+ session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
+
+ if (info->attrs[L2TP_ATTR_SEND_SEQ])
+ session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
+
+ if (info->attrs[L2TP_ATTR_LNS_MODE])
+ session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
+
+ if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
+ session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
+
+ if (info->attrs[L2TP_ATTR_MTU])
+ session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
+
+ if (info->attrs[L2TP_ATTR_MRU])
+ session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
+ struct l2tp_session *session)
+{
+ void *hdr;
+ struct nlattr *nest;
+ struct l2tp_tunnel *tunnel = session->tunnel;
+ struct sock *sk = NULL;
+
+ sk = tunnel->sock;
+
+ hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
+ if (IS_ERR(hdr))
+ return PTR_ERR(hdr);
+
+ NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id);
+ NLA_PUT_U32(skb, L2TP_ATTR_SESSION_ID, session->session_id);
+ NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id);
+ NLA_PUT_U32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id);
+ NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, session->debug);
+ NLA_PUT_U16(skb, L2TP_ATTR_PW_TYPE, session->pwtype);
+ NLA_PUT_U16(skb, L2TP_ATTR_MTU, session->mtu);
+ if (session->mru)
+ NLA_PUT_U16(skb, L2TP_ATTR_MRU, session->mru);
+
+ if (session->ifname && session->ifname[0])
+ NLA_PUT_STRING(skb, L2TP_ATTR_IFNAME, session->ifname);
+ if (session->cookie_len)
+ NLA_PUT(skb, L2TP_ATTR_COOKIE, session->cookie_len, &session->cookie[0]);
+ if (session->peer_cookie_len)
+ NLA_PUT(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, &session->peer_cookie[0]);
+ NLA_PUT_U8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq);
+ NLA_PUT_U8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq);
+ NLA_PUT_U8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode);
+#ifdef CONFIG_XFRM
+ if ((sk) && (sk->sk_policy[0] || sk->sk_policy[1]))
+ NLA_PUT_U8(skb, L2TP_ATTR_USING_IPSEC, 1);
+#endif
+ if (session->reorder_timeout)
+ NLA_PUT_MSECS(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout);
+
+ nest = nla_nest_start(skb, L2TP_ATTR_STATS);
+ if (nest == NULL)
+ goto nla_put_failure;
+ NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, session->stats.tx_packets);
+ NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, session->stats.tx_bytes);
+ NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, session->stats.tx_errors);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, session->stats.rx_packets);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, session->stats.rx_bytes);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, session->stats.rx_seq_discards);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, session->stats.rx_oos_packets);
+ NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, session->stats.rx_errors);
+ nla_nest_end(skb, nest);
+
+ return genlmsg_end(skb, hdr);
+
+ nla_put_failure:
+ genlmsg_cancel(skb, hdr);
+ return -1;
+}
+
+static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct l2tp_session *session;
+ struct sk_buff *msg;
+ int ret;
+
+ session = l2tp_nl_session_find(info);
+ if (session == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!msg) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq,
+ 0, session);
+ if (ret < 0)
+ goto err_out;
+
+ return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
+
+err_out:
+ nlmsg_free(msg);
+
+out:
+ return ret;
+}
+
+static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct l2tp_session *session;
+ struct l2tp_tunnel *tunnel = NULL;
+ int ti = cb->args[0];
+ int si = cb->args[1];
+
+ for (;;) {
+ if (tunnel == NULL) {
+ tunnel = l2tp_tunnel_find_nth(net, ti);
+ if (tunnel == NULL)
+ goto out;
+ }
+
+ session = l2tp_session_find_nth(tunnel, si);
+ if (session == NULL) {
+ ti++;
+ tunnel = NULL;
+ si = 0;
+ continue;
+ }
+
+ if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ session) <= 0)
+ break;
+
+ si++;
+ }
+
+out:
+ cb->args[0] = ti;
+ cb->args[1] = si;
+
+ return skb->len;
+}
+
+static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
+ [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
+ [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
+ [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
+ [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
+ [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
+ [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
+ [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
+ [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
+ [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
+ [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
+ [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
+ [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
+ [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
+ [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
+ [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
+ [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
+ [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
+ [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
+ [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
+ [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
+ [L2TP_ATTR_FD] = { .type = NLA_U32, },
+ [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
+ [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
+ [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
+ [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
+ [L2TP_ATTR_MTU] = { .type = NLA_U16, },
+ [L2TP_ATTR_MRU] = { .type = NLA_U16, },
+ [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
+ [L2TP_ATTR_IFNAME] = {
+ .type = NLA_NUL_STRING,
+ .len = IFNAMSIZ - 1,
+ },
+ [L2TP_ATTR_COOKIE] = {
+ .type = NLA_BINARY,
+ .len = 8,
+ },
+ [L2TP_ATTR_PEER_COOKIE] = {
+ .type = NLA_BINARY,
+ .len = 8,
+ },
+};
+
+static struct genl_ops l2tp_nl_ops[] = {
+ {
+ .cmd = L2TP_CMD_NOOP,
+ .doit = l2tp_nl_cmd_noop,
+ .policy = l2tp_nl_policy,
+ /* can be retrieved by unprivileged users */
+ },
+ {
+ .cmd = L2TP_CMD_TUNNEL_CREATE,
+ .doit = l2tp_nl_cmd_tunnel_create,
+ .policy = l2tp_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = L2TP_CMD_TUNNEL_DELETE,
+ .doit = l2tp_nl_cmd_tunnel_delete,
+ .policy = l2tp_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = L2TP_CMD_TUNNEL_MODIFY,
+ .doit = l2tp_nl_cmd_tunnel_modify,
+ .policy = l2tp_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = L2TP_CMD_TUNNEL_GET,
+ .doit = l2tp_nl_cmd_tunnel_get,
+ .dumpit = l2tp_nl_cmd_tunnel_dump,
+ .policy = l2tp_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = L2TP_CMD_SESSION_CREATE,
+ .doit = l2tp_nl_cmd_session_create,
+ .policy = l2tp_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = L2TP_CMD_SESSION_DELETE,
+ .doit = l2tp_nl_cmd_session_delete,
+ .policy = l2tp_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = L2TP_CMD_SESSION_MODIFY,
+ .doit = l2tp_nl_cmd_session_modify,
+ .policy = l2tp_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = L2TP_CMD_SESSION_GET,
+ .doit = l2tp_nl_cmd_session_get,
+ .dumpit = l2tp_nl_cmd_session_dump,
+ .policy = l2tp_nl_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+};
+
+int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
+{
+ int ret;
+
+ ret = -EINVAL;
+ if (pw_type >= __L2TP_PWTYPE_MAX)
+ goto err;
+
+ genl_lock();
+ ret = -EBUSY;
+ if (l2tp_nl_cmd_ops[pw_type])
+ goto out;
+
+ l2tp_nl_cmd_ops[pw_type] = ops;
+ ret = 0;
+
+out:
+ genl_unlock();
+err:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
+
+void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
+{
+ if (pw_type < __L2TP_PWTYPE_MAX) {
+ genl_lock();
+ l2tp_nl_cmd_ops[pw_type] = NULL;
+ genl_unlock();
+ }
+}
+EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
+
+static int l2tp_nl_init(void)
+{
+ int err;
+
+ printk(KERN_INFO "L2TP netlink interface\n");
+ err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
+ ARRAY_SIZE(l2tp_nl_ops));
+
+ return err;
+}
+
+static void l2tp_nl_cleanup(void)
+{
+ genl_unregister_family(&l2tp_nl_family);
+}
+
+module_init(l2tp_nl_init);
+module_exit(l2tp_nl_cleanup);
+
+MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
+MODULE_DESCRIPTION("L2TP netlink");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
+MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \
+ __stringify(NETLINK_GENERIC) "-type-" "l2tp");
diff --git a/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_ppp.c b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_ppp.c
new file mode 100644
index 0000000..cf7821b
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/l2tp/l2tp_ppp.c
@@ -0,0 +1,1853 @@
+/*****************************************************************************
+ * 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 program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+/* 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.
+ */
+
+#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/dst.h>
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/xfrm.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
+
+#define PRINTK(_mask, _type, _lvl, _fmt, args...) \
+ do { \
+ if ((_mask) & (_type)) \
+ printk(_lvl "PPPOL2TP: " _fmt, ##args); \
+ } while (0)
+
+/* 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 sock *sock; /* Pointer to the session
+ * PPPoX socket */
+ struct sock *tunnel_sock; /* Pointer to the tunnel UDP
+ * socket */
+ int flags; /* accessed by PPPIOCGFLAGS.
+ * Unused. */
+};
+
+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;
+
+/* Helpers to obtain tunnel/session contexts from sockets.
+ */
+static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
+{
+ struct l2tp_session *session;
+
+ if (sk == NULL)
+ return NULL;
+
+ sock_hold(sk);
+ session = (struct l2tp_session *)(sk->sk_user_data);
+ if (session == NULL) {
+ sock_put(sk);
+ goto out;
+ }
+
+ BUG_ON(session->magic != L2TP_SESSION_MAGIC);
+
+out:
+ return session;
+}
+
+/*****************************************************************************
+ * Receive data handling
+ *****************************************************************************/
+
+static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
+{
+ /* Skip PPP header, if present. In testing, Microsoft L2TP clients
+ * don't send the PPP header (PPP header compression enabled), but
+ * other clients can include the header. So we cope with both cases
+ * here. The PPP header is always FF03 when using L2TP.
+ *
+ * Note that skb->data[] isn't dereferenced from a u16 ptr here since
+ * the field may be unaligned.
+ */
+ if (!pskb_may_pull(skb, 2))
+ return 1;
+
+ if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
+ skb_pull(skb, 2);
+
+ return 0;
+}
+
+/* Receive message. This is the recvmsg for the PPPoL2TP socket.
+ */
+static int pppol2tp_recvmsg(struct kiocb *iocb, 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 & ~MSG_DONTWAIT,
+ flags & MSG_DONTWAIT, &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_iovec(skb, 0, msg->msg_iov, 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.
+ */
+ sk = ps->sock;
+ if (sk == NULL)
+ goto no_sock;
+
+ if (sk->sk_state & PPPOX_BOUND) {
+ struct pppox_sock *po;
+ PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
+ "%s: recv %d byte data frame, passing to ppp\n",
+ session->name, data_len);
+
+ /* We need to forget all info related to the L2TP packet
+ * gathered in the skb as we are going to reuse the same
+ * skb for the inner packet.
+ * Namely we need to:
+ * - reset xfrm (IPSec) information as it applies to
+ * the outer L2TP packet and not to the inner one
+ * - release the dst to force a route lookup on the inner
+ * IP packet since skb->dst currently points to the dst
+ * of the UDP tunnel
+ * - reset netfilter information as it doesn't apply
+ * to the inner packet either
+ */
+ secpath_reset(skb);
+ skb_dst_drop(skb);
+ nf_reset(skb);
+
+ po = pppox_sk(sk);
+ ppp_input(&po->chan, skb);
+ } else {
+ PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
+ "%s: socket not bound\n", session->name);
+
+ /* Not bound. Nothing we can do, so discard. */
+ session->stats.rx_errors++;
+ kfree_skb(skb);
+ }
+
+ return;
+
+no_sock:
+ PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
+ "%s: no socket\n", session->name);
+ kfree_skb(skb);
+}
+
+static void pppol2tp_session_sock_hold(struct l2tp_session *session)
+{
+ struct pppol2tp_session *ps = l2tp_session_priv(session);
+
+ if (ps->sock)
+ sock_hold(ps->sock);
+}
+
+static void pppol2tp_session_sock_put(struct l2tp_session *session)
+{
+ struct pppol2tp_session *ps = l2tp_session_priv(session);
+
+ if (ps->sock)
+ sock_put(ps->sock);
+}
+
+/************************************************************************
+ * 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 kiocb *iocb, struct socket *sock, struct msghdr *m,
+ size_t total_len)
+{
+ static const unsigned char ppph[2] = { 0xff, 0x03 };
+ struct sock *sk = sock->sk;
+ struct sk_buff *skb;
+ int error;
+ struct l2tp_session *session;
+ struct l2tp_tunnel *tunnel;
+ struct pppol2tp_session *ps;
+ 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 == NULL)
+ goto error;
+
+ ps = l2tp_session_priv(session);
+ tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
+ if (tunnel == NULL)
+ goto error_put_sess;
+
+ 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 +
+ sizeof(ppph) + total_len,
+ 0, GFP_KERNEL);
+ if (!skb)
+ goto error_put_sess_tun;
+
+ /* 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] = ppph[0];
+ skb->data[1] = ppph[1];
+ skb_put(skb, 2);
+
+ /* Copy user data into skb */
+ error = memcpy_fromiovec(skb_put(skb, total_len), m->msg_iov,
+ total_len);
+ if (error < 0) {
+ kfree_skb(skb);
+ goto error_put_sess_tun;
+ }
+
+ local_bh_disable();
+ l2tp_xmit_skb(session, skb, session->hdr_len);
+ local_bh_enable();
+
+ sock_put(ps->tunnel_sock);
+ sock_put(sk);
+
+ return total_len;
+
+error_put_sess_tun:
+ sock_put(ps->tunnel_sock);
+error_put_sess:
+ sock_put(sk);
+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)
+{
+ static const u8 ppph[2] = { 0xff, 0x03 };
+ struct sock *sk = (struct sock *) chan->private;
+ struct sock *sk_tun;
+ struct l2tp_session *session;
+ struct l2tp_tunnel *tunnel;
+ struct pppol2tp_session *ps;
+ int old_headroom;
+ int new_headroom;
+ 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 == NULL)
+ goto abort;
+
+ ps = l2tp_session_priv(session);
+ sk_tun = ps->tunnel_sock;
+ if (sk_tun == NULL)
+ goto abort_put_sess;
+ tunnel = l2tp_sock_to_tunnel(sk_tun);
+ if (tunnel == NULL)
+ goto abort_put_sess;
+
+ old_headroom = skb_headroom(skb);
+ 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 */
+ sizeof(ppph); /* PPP header */
+ if (skb_cow_head(skb, headroom))
+ goto abort_put_sess_tun;
+
+ new_headroom = skb_headroom(skb);
+ skb->truesize += new_headroom - old_headroom;
+
+ /* Setup PPP header */
+ __skb_push(skb, sizeof(ppph));
+ skb->data[0] = ppph[0];
+ skb->data[1] = ppph[1];
+
+ local_bh_disable();
+ l2tp_xmit_skb(session, skb, session->hdr_len);
+ local_bh_enable();
+
+ sock_put(sk_tun);
+ sock_put(sk);
+ return 1;
+
+abort_put_sess_tun:
+ sock_put(sk_tun);
+abort_put_sess:
+ sock_put(sk);
+abort:
+ /* Free the original skb */
+ kfree_skb(skb);
+ return 1;
+}
+
+/*****************************************************************************
+ * Session (and tunnel control) socket create/destroy.
+ *****************************************************************************/
+
+/* Called by l2tp_core when a session socket is being closed.
+ */
+static void pppol2tp_session_close(struct l2tp_session *session)
+{
+ struct pppol2tp_session *ps = l2tp_session_priv(session);
+ struct sock *sk = ps->sock;
+ struct sk_buff *skb;
+
+ BUG_ON(session->magic != L2TP_SESSION_MAGIC);
+
+ if (session->session_id == 0)
+ goto out;
+
+ if (sk != NULL) {
+ lock_sock(sk);
+
+ if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
+ pppox_unbind_sock(sk);
+ sk->sk_state = PPPOX_DEAD;
+ sk->sk_state_change(sk);
+ }
+
+ /* Purge any queued data */
+ skb_queue_purge(&sk->sk_receive_queue);
+ skb_queue_purge(&sk->sk_write_queue);
+ while ((skb = skb_dequeue(&session->reorder_q))) {
+ kfree_skb(skb);
+ sock_put(sk);
+ }
+
+ release_sock(sk);
+ }
+
+out:
+ return;
+}
+
+/* Really kill the session socket. (Called from sock_put() if
+ * refcnt == 0.)
+ */
+static void pppol2tp_session_destruct(struct sock *sk)
+{
+ struct l2tp_session *session;
+
+ if (sk->sk_user_data != NULL) {
+ session = sk->sk_user_data;
+ if (session == NULL)
+ goto out;
+
+ sk->sk_user_data = NULL;
+ BUG_ON(session->magic != L2TP_SESSION_MAGIC);
+ l2tp_session_dec_refcount(session);
+ }
+
+out:
+ return;
+}
+
+/* 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);
+
+ /* Purge any queued data */
+ skb_queue_purge(&sk->sk_receive_queue);
+ skb_queue_purge(&sk->sk_write_queue);
+ if (session != NULL) {
+ struct sk_buff *skb;
+ while ((skb = skb_dequeue(&session->reorder_q))) {
+ kfree_skb(skb);
+ sock_put(sk);
+ }
+ sock_put(sk);
+ }
+
+ release_sock(sk);
+
+ /* This will delete the session context via
+ * pppol2tp_session_destruct() if the socket's refcnt drops to
+ * zero.
+ */
+ sock_put(sk);
+
+ return 0;
+
+error:
+ release_sock(sk);
+ return error;
+}
+
+static struct proto pppol2tp_sk_proto = {
+ .name = "PPPOL2TP",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct pppox_sock),
+};
+
+static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
+{
+ int rc;
+
+ rc = l2tp_udp_encap_recv(sk, skb);
+ if (rc)
+ kfree_skb(skb);
+
+ return NET_RX_SUCCESS;
+}
+
+/* socket() handler. Initialize a new struct sock.
+ */
+static int pppol2tp_create(struct net *net, struct socket *sock)
+{
+ int error = -ENOMEM;
+ struct sock *sk;
+
+ sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
+ if (!sk)
+ goto out;
+
+ sock_init_data(sock, sk);
+
+ sock->state = SS_UNCONNECTED;
+ sock->ops = &pppol2tp_ops;
+
+ sk->sk_backlog_rcv = pppol2tp_backlog_recv;
+ sk->sk_protocol = PX_PROTO_OL2TP;
+ sk->sk_family = PF_PPPOX;
+ sk->sk_state = PPPOX_NONE;
+ sk->sk_type = SOCK_STREAM;
+ sk->sk_destruct = pppol2tp_session_destruct;
+
+ error = 0;
+
+out:
+ return error;
+}
+
+#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
+static void pppol2tp_show(struct seq_file *m, void *arg)
+{
+ struct l2tp_session *session = arg;
+ struct pppol2tp_session *ps = l2tp_session_priv(session);
+
+ if (ps) {
+ struct pppox_sock *po = pppox_sk(ps->sock);
+ if (po)
+ seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
+ }
+}
+#endif
+
+/* 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 sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
+ struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
+ struct pppox_sock *po = pppox_sk(sk);
+ struct l2tp_session *session = NULL;
+ struct l2tp_tunnel *tunnel;
+ struct pppol2tp_session *ps;
+ struct dst_entry *dst;
+ struct l2tp_session_cfg cfg = { 0, };
+ int error = 0;
+ u32 tunnel_id, peer_tunnel_id;
+ u32 session_id, peer_session_id;
+ int ver = 2;
+ int fd;
+
+ lock_sock(sk);
+
+ error = -EINVAL;
+ if (sp->sa_protocol != PX_PROTO_OL2TP)
+ goto end;
+
+ /* 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 */
+
+ /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
+ if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
+ fd = sp->pppol2tp.fd;
+ tunnel_id = sp->pppol2tp.s_tunnel;
+ peer_tunnel_id = sp->pppol2tp.d_tunnel;
+ session_id = sp->pppol2tp.s_session;
+ peer_session_id = sp->pppol2tp.d_session;
+ } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
+ ver = 3;
+ fd = sp3->pppol2tp.fd;
+ tunnel_id = sp3->pppol2tp.s_tunnel;
+ peer_tunnel_id = sp3->pppol2tp.d_tunnel;
+ session_id = sp3->pppol2tp.s_session;
+ peer_session_id = sp3->pppol2tp.d_session;
+ } else {
+ error = -EINVAL;
+ goto end; /* bad socket address */
+ }
+
+ /* Don't bind if tunnel_id is 0 */
+ error = -EINVAL;
+ if (tunnel_id == 0)
+ goto end;
+
+ tunnel = l2tp_tunnel_find(sock_net(sk), 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 ((session_id == 0) && (peer_session_id == 0)) {
+ if (tunnel == NULL) {
+ struct l2tp_tunnel_cfg tcfg = {
+ .encap = L2TP_ENCAPTYPE_UDP,
+ .debug = 0,
+ };
+ error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
+ if (error < 0)
+ goto end;
+ }
+ } else {
+ /* Error if we can't find the tunnel */
+ error = -ENOENT;
+ if (tunnel == NULL)
+ goto end;
+
+ /* Error if socket is not prepped */
+ if (tunnel->sock == NULL)
+ goto end;
+ }
+
+ if (tunnel->recv_payload_hook == NULL)
+ tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
+
+ if (tunnel->peer_tunnel_id == 0) {
+ if (ver == 2)
+ tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
+ else
+ tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
+ }
+
+ /* Create session if it doesn't already exist. We handle the
+ * case where a session was previously created by the netlink
+ * interface by checking that the session doesn't already have
+ * a socket and its tunnel socket are what we expect. If any
+ * of those checks fail, return EEXIST to the caller.
+ */
+ session = l2tp_session_find(sock_net(sk), tunnel, session_id);
+ if (session == NULL) {
+ /* Default MTU must allow space for UDP/L2TP/PPP
+ * headers.
+ */
+ cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
+
+ /* Allocate and initialize a new session context. */
+ session = l2tp_session_create(sizeof(struct pppol2tp_session),
+ tunnel, session_id,
+ peer_session_id, &cfg);
+ if (session == NULL) {
+ error = -ENOMEM;
+ goto end;
+ }
+ } else {
+ ps = l2tp_session_priv(session);
+ error = -EEXIST;
+ if (ps->sock != NULL)
+ goto end;
+
+ /* consistency checks */
+ if (ps->tunnel_sock != tunnel->sock)
+ goto end;
+ }
+
+ /* Associate session with its PPPoL2TP socket */
+ ps = l2tp_session_priv(session);
+ ps->owner = current->pid;
+ ps->sock = sk;
+ ps->tunnel_sock = tunnel->sock;
+
+ session->recv_skb = pppol2tp_recv;
+ session->session_close = pppol2tp_session_close;
+#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
+ session->show = pppol2tp_show;
+#endif
+
+ /* We need to know each time a skb is dropped from the reorder
+ * queue.
+ */
+ session->ref = pppol2tp_session_sock_hold;
+ session->deref = pppol2tp_session_sock_put;
+
+ /* If PMTU discovery was enabled, use the MTU that was discovered */
+ dst = sk_dst_get(tunnel->sock);
+ if (dst != NULL) {
+ u32 pmtu = dst_mtu(dst);
+
+ if (pmtu != 0)
+ session->mtu = session->mru = pmtu -
+ PPPOL2TP_HEADER_OVERHEAD;
+ dst_release(dst);
+ }
+
+ /* 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 = session->mtu;
+
+ error = ppp_register_net_channel(sock_net(sk), &po->chan);
+ if (error)
+ goto end;
+
+out_no_ppp:
+ /* This is how we get the session context from the socket. */
+ sk->sk_user_data = session;
+ sk->sk_state = PPPOX_CONNECTED;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: created\n", session->name);
+
+end:
+ 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, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
+{
+ int error;
+ struct l2tp_tunnel *tunnel;
+ struct l2tp_session *session;
+ struct pppol2tp_session *ps;
+
+ tunnel = l2tp_tunnel_find(net, tunnel_id);
+
+ /* Error if we can't find the tunnel */
+ error = -ENOENT;
+ if (tunnel == NULL)
+ goto out;
+
+ /* Error if tunnel socket is not prepped */
+ if (tunnel->sock == NULL)
+ goto out;
+
+ /* Check that this session doesn't already exist */
+ error = -EEXIST;
+ session = l2tp_session_find(net, tunnel, session_id);
+ if (session != NULL)
+ goto out;
+
+ /* Default MTU values. */
+ if (cfg->mtu == 0)
+ cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
+ if (cfg->mru == 0)
+ cfg->mru = cfg->mtu;
+
+ /* Allocate and initialize a new session context. */
+ error = -ENOMEM;
+ session = l2tp_session_create(sizeof(struct pppol2tp_session),
+ tunnel, session_id,
+ peer_session_id, cfg);
+ if (session == NULL)
+ goto out;
+
+ ps = l2tp_session_priv(session);
+ ps->tunnel_sock = tunnel->sock;
+
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: created\n", session->name);
+
+ error = 0;
+
+out:
+ return error;
+}
+
+/* Called when deleting sessions via the netlink interface.
+ */
+static int pppol2tp_session_delete(struct l2tp_session *session)
+{
+ struct pppol2tp_session *ps = l2tp_session_priv(session);
+
+ if (ps->sock == NULL)
+ l2tp_session_dec_refcount(session);
+
+ return 0;
+}
+
+#endif /* CONFIG_L2TP_V3 */
+
+/* getname() support.
+ */
+static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
+ int *usockaddr_len, 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 == NULL)
+ goto end;
+ if (sk->sk_state != PPPOX_CONNECTED)
+ goto end;
+
+ error = -EBADF;
+ session = pppol2tp_sock_to_session(sk);
+ if (session == NULL)
+ goto end;
+
+ pls = l2tp_session_priv(session);
+ tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
+ if (tunnel == NULL) {
+ error = -EBADF;
+ goto end_put_sess;
+ }
+
+ inet = inet_sk(tunnel->sock);
+ if (tunnel->version == 2) {
+ 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);
+ } 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);
+ }
+
+ *usockaddr_len = len;
+
+ sock_put(pls->tunnel_sock);
+end_put_sess:
+ sock_put(sk);
+ error = 0;
+
+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,
+ struct l2tp_stats *stats)
+{
+ dest->tx_packets = stats->tx_packets;
+ dest->tx_bytes = stats->tx_bytes;
+ dest->tx_errors = stats->tx_errors;
+ dest->rx_packets = stats->rx_packets;
+ dest->rx_bytes = stats->rx_bytes;
+ dest->rx_seq_discards = stats->rx_seq_discards;
+ dest->rx_oos_packets = stats->rx_oos_packets;
+ dest->rx_errors = stats->rx_errors;
+}
+
+/* Session ioctl helper.
+ */
+static int pppol2tp_session_ioctl(struct l2tp_session *session,
+ unsigned int cmd, unsigned long arg)
+{
+ struct ifreq ifr;
+ int err = 0;
+ struct sock *sk;
+ int val = (int) arg;
+ struct pppol2tp_session *ps = l2tp_session_priv(session);
+ struct l2tp_tunnel *tunnel = session->tunnel;
+ struct pppol2tp_ioc_stats stats;
+
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
+ "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
+ session->name, cmd, arg);
+
+ sk = ps->sock;
+ sock_hold(sk);
+
+ switch (cmd) {
+ case SIOCGIFMTU:
+ err = -ENXIO;
+ if (!(sk->sk_state & PPPOX_CONNECTED))
+ break;
+
+ err = -EFAULT;
+ if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
+ break;
+ ifr.ifr_mtu = session->mtu;
+ if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
+ break;
+
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get mtu=%d\n", session->name, session->mtu);
+ err = 0;
+ break;
+
+ case SIOCSIFMTU:
+ err = -ENXIO;
+ if (!(sk->sk_state & PPPOX_CONNECTED))
+ break;
+
+ err = -EFAULT;
+ if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
+ break;
+
+ session->mtu = ifr.ifr_mtu;
+
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set mtu=%d\n", session->name, session->mtu);
+ err = 0;
+ break;
+
+ case PPPIOCGMRU:
+ err = -ENXIO;
+ if (!(sk->sk_state & PPPOX_CONNECTED))
+ break;
+
+ err = -EFAULT;
+ if (put_user(session->mru, (int __user *) arg))
+ break;
+
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get mru=%d\n", session->name, session->mru);
+ err = 0;
+ break;
+
+ case PPPIOCSMRU:
+ err = -ENXIO;
+ if (!(sk->sk_state & PPPOX_CONNECTED))
+ break;
+
+ err = -EFAULT;
+ if (get_user(val, (int __user *) arg))
+ break;
+
+ session->mru = val;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set mru=%d\n", session->name, session->mru);
+ err = 0;
+ break;
+
+ case PPPIOCGFLAGS:
+ err = -EFAULT;
+ if (put_user(ps->flags, (int __user *) arg))
+ break;
+
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get flags=%d\n", session->name, ps->flags);
+ err = 0;
+ break;
+
+ case PPPIOCSFLAGS:
+ err = -EFAULT;
+ if (get_user(val, (int __user *) arg))
+ break;
+ ps->flags = val;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set flags=%d\n", session->name, ps->flags);
+ err = 0;
+ break;
+
+ case PPPIOCGL2TPSTATS:
+ err = -ENXIO;
+ if (!(sk->sk_state & PPPOX_CONNECTED))
+ break;
+
+ memset(&stats, 0, sizeof(stats));
+ stats.tunnel_id = tunnel->tunnel_id;
+ stats.session_id = session->session_id;
+ pppol2tp_copy_stats(&stats, &session->stats);
+ if (copy_to_user((void __user *) arg, &stats,
+ sizeof(stats)))
+ break;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get L2TP stats\n", session->name);
+ err = 0;
+ break;
+
+ default:
+ err = -ENOSYS;
+ break;
+ }
+
+ sock_put(sk);
+
+ return err;
+}
+
+/* Tunnel ioctl helper.
+ *
+ * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
+ * specifies a session_id, the session ioctl handler is called. This allows an
+ * application to retrieve session stats via a tunnel socket.
+ */
+static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
+ unsigned int cmd, unsigned long arg)
+{
+ int err = 0;
+ struct sock *sk;
+ struct pppol2tp_ioc_stats stats;
+
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
+ "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
+ tunnel->name, cmd, arg);
+
+ sk = tunnel->sock;
+ sock_hold(sk);
+
+ switch (cmd) {
+ case PPPIOCGL2TPSTATS:
+ err = -ENXIO;
+ if (!(sk->sk_state & PPPOX_CONNECTED))
+ break;
+
+ if (copy_from_user(&stats, (void __user *) arg,
+ sizeof(stats))) {
+ err = -EFAULT;
+ break;
+ }
+ if (stats.session_id != 0) {
+ /* resend to session ioctl handler */
+ struct l2tp_session *session =
+ l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
+ if (session != NULL)
+ err = pppol2tp_session_ioctl(session, cmd, arg);
+ else
+ err = -EBADR;
+ break;
+ }
+#ifdef CONFIG_XFRM
+ stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
+#endif
+ pppol2tp_copy_stats(&stats, &tunnel->stats);
+ if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
+ err = -EFAULT;
+ break;
+ }
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get L2TP stats\n", tunnel->name);
+ err = 0;
+ break;
+
+ default:
+ err = -ENOSYS;
+ break;
+ }
+
+ sock_put(sk);
+
+ return err;
+}
+
+/* Main ioctl() handler.
+ * Dispatch to tunnel or session helpers depending on the socket.
+ */
+static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
+ unsigned long arg)
+{
+ struct sock *sk = sock->sk;
+ struct l2tp_session *session;
+ struct l2tp_tunnel *tunnel;
+ struct pppol2tp_session *ps;
+ int err;
+
+ if (!sk)
+ return 0;
+
+ err = -EBADF;
+ if (sock_flag(sk, SOCK_DEAD) != 0)
+ goto end;
+
+ err = -ENOTCONN;
+ if ((sk->sk_user_data == NULL) ||
+ (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
+ goto end;
+
+ /* Get session context from the socket */
+ err = -EBADF;
+ session = pppol2tp_sock_to_session(sk);
+ if (session == NULL)
+ goto end;
+
+ /* Special case: if session's session_id is zero, treat ioctl as a
+ * tunnel ioctl
+ */
+ ps = l2tp_session_priv(session);
+ if ((session->session_id == 0) &&
+ (session->peer_session_id == 0)) {
+ err = -EBADF;
+ tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
+ if (tunnel == NULL)
+ goto end_put_sess;
+
+ err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
+ sock_put(ps->tunnel_sock);
+ goto end_put_sess;
+ }
+
+ err = pppol2tp_session_ioctl(session, cmd, arg);
+
+end_put_sess:
+ sock_put(sk);
+end:
+ return err;
+}
+
+/*****************************************************************************
+ * 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 = val;
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set debug=%x\n", tunnel->name, tunnel->debug);
+ 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;
+ struct pppol2tp_session *ps = l2tp_session_priv(session);
+
+ switch (optname) {
+ case PPPOL2TP_SO_RECVSEQ:
+ if ((val != 0) && (val != 1)) {
+ err = -EINVAL;
+ break;
+ }
+ session->recv_seq = val ? -1 : 0;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set recv_seq=%d\n", session->name, session->recv_seq);
+ break;
+
+ case PPPOL2TP_SO_SENDSEQ:
+ if ((val != 0) && (val != 1)) {
+ err = -EINVAL;
+ break;
+ }
+ session->send_seq = val ? -1 : 0;
+ {
+ struct sock *ssk = ps->sock;
+ struct pppox_sock *po = pppox_sk(ssk);
+ po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
+ PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
+ }
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set send_seq=%d\n", session->name, session->send_seq);
+ break;
+
+ case PPPOL2TP_SO_LNSMODE:
+ if ((val != 0) && (val != 1)) {
+ err = -EINVAL;
+ break;
+ }
+ session->lns_mode = val ? -1 : 0;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set lns_mode=%d\n", session->name, session->lns_mode);
+ break;
+
+ case PPPOL2TP_SO_DEBUG:
+ session->debug = val;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set debug=%x\n", session->name, session->debug);
+ break;
+
+ case PPPOL2TP_SO_REORDERTO:
+ session->reorder_timeout = msecs_to_jiffies(val);
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
+ 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,
+ char __user *optval, unsigned int optlen)
+{
+ struct sock *sk = sock->sk;
+ struct l2tp_session *session;
+ struct l2tp_tunnel *tunnel;
+ struct pppol2tp_session *ps;
+ int val;
+ int err;
+
+ if (level != SOL_PPPOL2TP)
+ return -EINVAL;
+
+ if (optlen < sizeof(int))
+ return -EINVAL;
+
+ if (get_user(val, (int __user *)optval))
+ return -EFAULT;
+
+ err = -ENOTCONN;
+ if (sk->sk_user_data == NULL)
+ goto end;
+
+ /* Get session context from the socket */
+ err = -EBADF;
+ session = pppol2tp_sock_to_session(sk);
+ if (session == NULL)
+ goto end;
+
+ /* Special case: if session_id == 0x0000, treat as operation on tunnel
+ */
+ ps = l2tp_session_priv(session);
+ if ((session->session_id == 0) &&
+ (session->peer_session_id == 0)) {
+ err = -EBADF;
+ tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
+ if (tunnel == NULL)
+ goto end_put_sess;
+
+ err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
+ sock_put(ps->tunnel_sock);
+ } else
+ err = pppol2tp_session_setsockopt(sk, session, optname, val);
+
+ err = 0;
+
+end_put_sess:
+ sock_put(sk);
+end:
+ return err;
+}
+
+/* Tunnel getsockopt helper. Called with sock locked.
+ */
+static int pppol2tp_tunnel_getsockopt(struct sock *sk,
+ struct l2tp_tunnel *tunnel,
+ int optname, int *val)
+{
+ int err = 0;
+
+ switch (optname) {
+ case PPPOL2TP_SO_DEBUG:
+ *val = tunnel->debug;
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get debug=%x\n", tunnel->name, tunnel->debug);
+ 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;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get recv_seq=%d\n", session->name, *val);
+ break;
+
+ case PPPOL2TP_SO_SENDSEQ:
+ *val = session->send_seq;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get send_seq=%d\n", session->name, *val);
+ break;
+
+ case PPPOL2TP_SO_LNSMODE:
+ *val = session->lns_mode;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get lns_mode=%d\n", session->name, *val);
+ break;
+
+ case PPPOL2TP_SO_DEBUG:
+ *val = session->debug;
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get debug=%d\n", session->name, *val);
+ break;
+
+ case PPPOL2TP_SO_REORDERTO:
+ *val = (int) jiffies_to_msecs(session->reorder_timeout);
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
+ "%s: get reorder_timeout=%d\n", session->name, *val);
+ 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;
+ struct pppol2tp_session *ps;
+
+ if (level != SOL_PPPOL2TP)
+ return -EINVAL;
+
+ if (get_user(len, (int __user *) optlen))
+ return -EFAULT;
+
+ len = min_t(unsigned int, len, sizeof(int));
+
+ if (len < 0)
+ return -EINVAL;
+
+ err = -ENOTCONN;
+ if (sk->sk_user_data == NULL)
+ goto end;
+
+ /* Get the session context */
+ err = -EBADF;
+ session = pppol2tp_sock_to_session(sk);
+ if (session == NULL)
+ goto end;
+
+ /* Special case: if session_id == 0x0000, treat as operation on tunnel */
+ ps = l2tp_session_priv(session);
+ if ((session->session_id == 0) &&
+ (session->peer_session_id == 0)) {
+ err = -EBADF;
+ tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
+ if (tunnel == NULL)
+ goto end_put_sess;
+
+ err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
+ sock_put(ps->tunnel_sock);
+ } else
+ err = pppol2tp_session_getsockopt(sk, session, optname, &val);
+
+ err = -EFAULT;
+ if (put_user(len, (int __user *) optlen))
+ goto end_put_sess;
+
+ if (copy_to_user((void __user *) optval, &val, len))
+ goto end_put_sess;
+
+ err = 0;
+
+end_put_sess:
+ sock_put(sk);
+end:
+ return err;
+}
+
+/*****************************************************************************
+ * /proc filesystem for debug
+ * Since the original pppol2tp driver provided /proc/net/pppol2tp for
+ * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
+ *****************************************************************************/
+
+static unsigned int pppol2tp_net_id;
+
+#ifdef CONFIG_PROC_FS
+
+struct pppol2tp_seq_data {
+ struct seq_net_private p;
+ int tunnel_idx; /* current tunnel */
+ int session_idx; /* index of session within current tunnel */
+ struct l2tp_tunnel *tunnel;
+ struct l2tp_session *session; /* NULL means get next tunnel */
+};
+
+static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
+{
+ for (;;) {
+ pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
+ pd->tunnel_idx++;
+
+ if (pd->tunnel == NULL)
+ break;
+
+ /* Ignore L2TPv3 tunnels */
+ if (pd->tunnel->version < 3)
+ break;
+ }
+}
+
+static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
+{
+ pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
+ pd->session_idx++;
+
+ if (pd->session == NULL) {
+ pd->session_idx = 0;
+ pppol2tp_next_tunnel(net, pd);
+ }
+}
+
+static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
+{
+ struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
+ loff_t pos = *offs;
+ struct net *net;
+
+ if (!pos)
+ goto out;
+
+ BUG_ON(m->private == NULL);
+ pd = m->private;
+ net = seq_file_net(m);
+
+ if (pd->tunnel == NULL)
+ pppol2tp_next_tunnel(net, pd);
+ else
+ pppol2tp_next_session(net, pd);
+
+ /* NULL tunnel and session indicates end of list */
+ if ((pd->tunnel == NULL) && (pd->session == NULL))
+ 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)
+{
+ /* nothing to do */
+}
+
+static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
+{
+ struct l2tp_tunnel *tunnel = v;
+
+ seq_printf(m, "\nTUNNEL '%s', %c %d\n",
+ tunnel->name,
+ (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
+ atomic_read(&tunnel->ref_count) - 1);
+ seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
+ tunnel->debug,
+ (unsigned long long)tunnel->stats.tx_packets,
+ (unsigned long long)tunnel->stats.tx_bytes,
+ (unsigned long long)tunnel->stats.tx_errors,
+ (unsigned long long)tunnel->stats.rx_packets,
+ (unsigned long long)tunnel->stats.rx_bytes,
+ (unsigned long long)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;
+ struct pppol2tp_session *ps = l2tp_session_priv(session);
+ struct pppox_sock *po = pppox_sk(ps->sock);
+ 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);
+ }
+
+ 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,
+ ps->sock->sk_state,
+ (session == ps->sock->sk_user_data) ?
+ 'Y' : 'N');
+ seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
+ session->mtu, session->mru,
+ session->recv_seq ? 'R' : '-',
+ session->send_seq ? 'S' : '-',
+ session->lns_mode ? "LNS" : "LAC",
+ session->debug,
+ jiffies_to_msecs(session->reorder_timeout));
+ seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
+ session->nr, session->ns,
+ (unsigned long long)session->stats.tx_packets,
+ (unsigned long long)session->stats.tx_bytes,
+ (unsigned long long)session->stats.tx_errors,
+ (unsigned long long)session->stats.rx_packets,
+ (unsigned long long)session->stats.rx_bytes,
+ (unsigned long long)session->stats.rx_errors);
+
+ if (po)
+ seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
+}
+
+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;
+ }
+
+ /* Show the tunnel or session context.
+ */
+ if (pd->session == NULL)
+ 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,
+};
+
+/* Called when our /proc file is opened. We allocate data for use when
+ * iterating our tunnel / session contexts and store it in the private
+ * data of the seq_file.
+ */
+static int pppol2tp_proc_open(struct inode *inode, struct file *file)
+{
+ return seq_open_net(inode, file, &pppol2tp_seq_ops,
+ sizeof(struct pppol2tp_seq_data));
+}
+
+static const struct file_operations pppol2tp_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = pppol2tp_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_net,
+};
+
+#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_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
+ if (!pde) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+out:
+ return err;
+}
+
+static __net_exit void pppol2tp_exit_net(struct net *net)
+{
+ proc_net_remove(net, "pppol2tp");
+}
+
+static struct pernet_operations pppol2tp_net_ops = {
+ .init = pppol2tp_init_net,
+ .exit = pppol2tp_exit_net,
+ .id = &pppol2tp_net_id,
+};
+
+/*****************************************************************************
+ * Init and cleanup
+ *****************************************************************************/
+
+static const struct proto_ops pppol2tp_ops = {
+ .family = AF_PPPOX,
+ .owner = THIS_MODULE,
+ .release = pppol2tp_release,
+ .bind = sock_no_bind,
+ .connect = pppol2tp_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = pppol2tp_getname,
+ .poll = datagram_poll,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = pppol2tp_setsockopt,
+ .getsockopt = pppol2tp_getsockopt,
+ .sendmsg = pppol2tp_sendmsg,
+ .recvmsg = pppol2tp_recvmsg,
+ .mmap = sock_no_mmap,
+ .ioctl = pppox_ioctl,
+};
+
+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 = pppol2tp_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
+
+ printk(KERN_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("pppox-proto-" __stringify(PX_PROTO_OL2TP));