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@@ -0,0 +1,2486 @@
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+/*****************************************************************************
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+ * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets
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+ *
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+ * PPPoX --- Generic PPP encapsulation socket family
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+ * PPPoL2TP --- PPP over L2TP (RFC 2661)
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+ *
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+ * Version: 1.0.0
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+ *
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+ * Authors: Martijn van Oosterhout <kleptog@svana.org>
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+ * James Chapman (jchapman@katalix.com)
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+ * Contributors:
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+ * Michal Ostrowski <mostrows@speakeasy.net>
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+ * Arnaldo Carvalho de Melo <acme@xconectiva.com.br>
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+ * David S. Miller (davem@redhat.com)
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+ *
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+ * License:
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version
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+ * 2 of the License, or (at your option) any later version.
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+ *
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+ */
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+
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+/* This driver handles only L2TP data frames; control frames are handled by a
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+ * userspace application.
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+ *
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+ * To send data in an L2TP session, userspace opens a PPPoL2TP socket and
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+ * attaches it to a bound UDP socket with local tunnel_id / session_id and
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+ * peer tunnel_id / session_id set. Data can then be sent or received using
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+ * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket
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+ * can be read or modified using ioctl() or [gs]etsockopt() calls.
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+ *
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+ * When a PPPoL2TP socket is connected with local and peer session_id values
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+ * zero, the socket is treated as a special tunnel management socket.
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+ *
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+ * Here's example userspace code to create a socket for sending/receiving data
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+ * over an L2TP session:-
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+ *
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+ * struct sockaddr_pppol2tp sax;
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+ * int fd;
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+ * int session_fd;
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+ *
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+ * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
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+ *
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+ * sax.sa_family = AF_PPPOX;
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+ * sax.sa_protocol = PX_PROTO_OL2TP;
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+ * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket
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+ * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr;
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+ * sax.pppol2tp.addr.sin_port = addr->sin_port;
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+ * sax.pppol2tp.addr.sin_family = AF_INET;
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+ * sax.pppol2tp.s_tunnel = tunnel_id;
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+ * sax.pppol2tp.s_session = session_id;
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+ * sax.pppol2tp.d_tunnel = peer_tunnel_id;
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+ * sax.pppol2tp.d_session = peer_session_id;
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+ *
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+ * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax));
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+ *
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+ * A pppd plugin that allows PPP traffic to be carried over L2TP using
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+ * this driver is available from the OpenL2TP project at
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+ * http://openl2tp.sourceforge.net.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/version.h>
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+#include <linux/string.h>
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+#include <linux/list.h>
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+#include <asm/uaccess.h>
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+
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+#include <linux/kernel.h>
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+#include <linux/spinlock.h>
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+#include <linux/kthread.h>
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+#include <linux/sched.h>
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+#include <linux/slab.h>
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+#include <linux/errno.h>
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+#include <linux/jiffies.h>
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+
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+#include <linux/netdevice.h>
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+#include <linux/net.h>
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+#include <linux/inetdevice.h>
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+#include <linux/skbuff.h>
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+#include <linux/init.h>
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+#include <linux/ip.h>
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+#include <linux/udp.h>
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+#include <linux/if_pppox.h>
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+#include <linux/if_pppol2tp.h>
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+#include <net/sock.h>
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+#include <linux/ppp_channel.h>
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+#include <linux/ppp_defs.h>
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+#include <linux/if_ppp.h>
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+#include <linux/file.h>
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+#include <linux/hash.h>
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+#include <linux/sort.h>
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+#include <linux/proc_fs.h>
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+#include <net/dst.h>
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+#include <net/ip.h>
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+#include <net/udp.h>
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+#include <net/xfrm.h>
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+
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+#include <asm/byteorder.h>
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+#include <asm/atomic.h>
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+
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+
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+#define PPPOL2TP_DRV_VERSION "V1.0"
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+
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+/* L2TP header constants */
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+#define L2TP_HDRFLAG_T 0x8000
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+#define L2TP_HDRFLAG_L 0x4000
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+#define L2TP_HDRFLAG_S 0x0800
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+#define L2TP_HDRFLAG_O 0x0200
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+#define L2TP_HDRFLAG_P 0x0100
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+
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+#define L2TP_HDR_VER_MASK 0x000F
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+#define L2TP_HDR_VER 0x0002
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+
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+/* Space for UDP, L2TP and PPP headers */
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+#define PPPOL2TP_HEADER_OVERHEAD 40
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+
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+/* Just some random numbers */
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+#define L2TP_TUNNEL_MAGIC 0x42114DDA
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+#define L2TP_SESSION_MAGIC 0x0C04EB7D
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+
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+#define PPPOL2TP_HASH_BITS 4
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+#define PPPOL2TP_HASH_SIZE (1 << PPPOL2TP_HASH_BITS)
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+
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+/* Default trace flags */
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+#define PPPOL2TP_DEFAULT_DEBUG_FLAGS 0
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+
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+#define PRINTK(_mask, _type, _lvl, _fmt, args...) \
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+ do { \
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+ if ((_mask) & (_type)) \
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+ printk(_lvl "PPPOL2TP: " _fmt, ##args); \
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+ } while(0)
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+
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+/* Number of bytes to build transmit L2TP headers.
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+ * Unfortunately the size is different depending on whether sequence numbers
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+ * are enabled.
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+ */
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+#define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
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+#define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
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+
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+struct pppol2tp_tunnel;
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+
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+/* Describes a session. It is the sk_user_data field in the PPPoL2TP
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+ * socket. Contains information to determine incoming packets and transmit
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+ * outgoing ones.
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+ */
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+struct pppol2tp_session
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+{
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+ int magic; /* should be
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+ * L2TP_SESSION_MAGIC */
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+ int owner; /* pid that opened the socket */
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+
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+ struct sock *sock; /* Pointer to the session
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+ * PPPoX socket */
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+ struct sock *tunnel_sock; /* Pointer to the tunnel UDP
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+ * socket */
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+
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+ struct pppol2tp_addr tunnel_addr; /* Description of tunnel */
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+
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+ struct pppol2tp_tunnel *tunnel; /* back pointer to tunnel
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+ * context */
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+
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+ char name[20]; /* "sess xxxxx/yyyyy", where
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+ * x=tunnel_id, y=session_id */
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+ int mtu;
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+ int mru;
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+ int flags; /* accessed by PPPIOCGFLAGS.
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+ * Unused. */
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+ unsigned recv_seq:1; /* expect receive packets with
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+ * sequence numbers? */
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+ unsigned send_seq:1; /* send packets with sequence
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+ * numbers? */
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+ unsigned lns_mode:1; /* behave as LNS? LAC enables
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+ * sequence numbers under
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+ * control of LNS. */
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+ int debug; /* bitmask of debug message
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+ * categories */
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+ int reorder_timeout; /* configured reorder timeout
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+ * (in jiffies) */
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+ u16 nr; /* session NR state (receive) */
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+ u16 ns; /* session NR state (send) */
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+ struct sk_buff_head reorder_q; /* receive reorder queue */
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+ struct pppol2tp_ioc_stats stats;
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+ struct hlist_node hlist; /* Hash list node */
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+};
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+
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+/* The sk_user_data field of the tunnel's UDP socket. It contains info to track
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+ * all the associated sessions so incoming packets can be sorted out
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+ */
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+struct pppol2tp_tunnel
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+{
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+ int magic; /* Should be L2TP_TUNNEL_MAGIC */
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+ rwlock_t hlist_lock; /* protect session_hlist */
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+ struct hlist_head session_hlist[PPPOL2TP_HASH_SIZE];
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+ /* hashed list of sessions,
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+ * hashed by id */
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+ int debug; /* bitmask of debug message
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+ * categories */
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+ char name[12]; /* "tunl xxxxx" */
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+ struct pppol2tp_ioc_stats stats;
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+
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+ void (*old_sk_destruct)(struct sock *);
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+
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+ struct sock *sock; /* Parent socket */
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+ struct list_head list; /* Keep a list of all open
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+ * prepared sockets */
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+
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+ atomic_t ref_count;
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+};
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+
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+/* Private data stored for received packets in the skb.
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+ */
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+struct pppol2tp_skb_cb {
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+ u16 ns;
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+ u16 nr;
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+ u16 has_seq;
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+ u16 length;
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+ unsigned long expires;
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+};
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+
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+#define PPPOL2TP_SKB_CB(skb) ((struct pppol2tp_skb_cb *) &skb->cb[sizeof(struct inet_skb_parm)])
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+
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+static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
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+static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel);
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+
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+static atomic_t pppol2tp_tunnel_count;
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+static atomic_t pppol2tp_session_count;
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+static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL };
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+static struct proto_ops pppol2tp_ops;
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+static LIST_HEAD(pppol2tp_tunnel_list);
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+static DEFINE_RWLOCK(pppol2tp_tunnel_list_lock);
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+
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+/* Helpers to obtain tunnel/session contexts from sockets.
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+ */
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+static inline struct pppol2tp_session *pppol2tp_sock_to_session(struct sock *sk)
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+{
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+ struct pppol2tp_session *session;
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+
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+ if (sk == NULL)
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+ return NULL;
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+
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+ session = (struct pppol2tp_session *)(sk->sk_user_data);
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+ if (session == NULL)
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+ return NULL;
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+
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+ BUG_ON(session->magic != L2TP_SESSION_MAGIC);
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+
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+ return session;
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+}
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+
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+static inline struct pppol2tp_tunnel *pppol2tp_sock_to_tunnel(struct sock *sk)
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+{
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+ struct pppol2tp_tunnel *tunnel;
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+
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+ if (sk == NULL)
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+ return NULL;
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+
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+ tunnel = (struct pppol2tp_tunnel *)(sk->sk_user_data);
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+ if (tunnel == NULL)
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+ return NULL;
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+
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+ BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
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+
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+ return tunnel;
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+}
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+
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+/* Tunnel reference counts. Incremented per session that is added to
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+ * the tunnel.
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+ */
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+static inline void pppol2tp_tunnel_inc_refcount(struct pppol2tp_tunnel *tunnel)
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+{
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+ atomic_inc(&tunnel->ref_count);
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+}
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+
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+static inline void pppol2tp_tunnel_dec_refcount(struct pppol2tp_tunnel *tunnel)
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+{
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+ if (atomic_dec_and_test(&tunnel->ref_count))
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+ pppol2tp_tunnel_free(tunnel);
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+}
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+
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+/* Session hash list.
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+ * The session_id SHOULD be random according to RFC2661, but several
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+ * L2TP implementations (Cisco and Microsoft) use incrementing
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+ * session_ids. So we do a real hash on the session_id, rather than a
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+ * simple bitmask.
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+ */
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+static inline struct hlist_head *
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+pppol2tp_session_id_hash(struct pppol2tp_tunnel *tunnel, u16 session_id)
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+{
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+ unsigned long hash_val = (unsigned long) session_id;
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+ return &tunnel->session_hlist[hash_long(hash_val, PPPOL2TP_HASH_BITS)];
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+}
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+
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+/* Lookup a session by id
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+ */
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+static struct pppol2tp_session *
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+pppol2tp_session_find(struct pppol2tp_tunnel *tunnel, u16 session_id)
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+{
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+ struct hlist_head *session_list =
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+ pppol2tp_session_id_hash(tunnel, session_id);
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+ struct pppol2tp_session *session;
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+ struct hlist_node *walk;
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+
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+ read_lock(&tunnel->hlist_lock);
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+ hlist_for_each_entry(session, walk, session_list, hlist) {
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+ if (session->tunnel_addr.s_session == session_id) {
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+ read_unlock(&tunnel->hlist_lock);
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+ return session;
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+ }
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+ }
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+ read_unlock(&tunnel->hlist_lock);
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+
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+ return NULL;
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+}
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+
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+/* Lookup a tunnel by id
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+ */
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+static struct pppol2tp_tunnel *pppol2tp_tunnel_find(u16 tunnel_id)
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+{
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+ struct pppol2tp_tunnel *tunnel = NULL;
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+
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+ read_lock(&pppol2tp_tunnel_list_lock);
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+ list_for_each_entry(tunnel, &pppol2tp_tunnel_list, list) {
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+ if (tunnel->stats.tunnel_id == tunnel_id) {
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+ read_unlock(&pppol2tp_tunnel_list_lock);
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+ return tunnel;
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+ }
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+ }
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+ read_unlock(&pppol2tp_tunnel_list_lock);
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+
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+ return NULL;
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+}
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+
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+/*****************************************************************************
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+ * Receive data handling
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+ *****************************************************************************/
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+
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+/* Queue a skb in order. We come here only if the skb has an L2TP sequence
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+ * number.
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+ */
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+static void pppol2tp_recv_queue_skb(struct pppol2tp_session *session, struct sk_buff *skb)
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+{
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+ struct sk_buff *skbp;
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+ u16 ns = PPPOL2TP_SKB_CB(skb)->ns;
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+
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+ spin_lock(&session->reorder_q.lock);
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+ skb_queue_walk(&session->reorder_q, skbp) {
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+ if (PPPOL2TP_SKB_CB(skbp)->ns > ns) {
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+ __skb_insert(skb, skbp->prev, skbp, &session->reorder_q);
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+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
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+ "%s: pkt %hu, inserted before %hu, reorder_q len=%d\n",
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+ session->name, ns, PPPOL2TP_SKB_CB(skbp)->ns,
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+ skb_queue_len(&session->reorder_q));
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+ session->stats.rx_oos_packets++;
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+ goto out;
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+ }
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+ }
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+
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+ __skb_queue_tail(&session->reorder_q, skb);
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+
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+out:
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+ spin_unlock(&session->reorder_q.lock);
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+}
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+
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+/* Dequeue a single skb.
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+ */
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+static void pppol2tp_recv_dequeue_skb(struct pppol2tp_session *session, struct sk_buff *skb)
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+{
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+ struct pppol2tp_tunnel *tunnel = session->tunnel;
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+ int length = PPPOL2TP_SKB_CB(skb)->length;
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+ struct sock *session_sock = NULL;
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+
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+ /* We're about to requeue the skb, so unlink it and return resources
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+ * to its current owner (a socket receive buffer).
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+ */
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+ skb_unlink(skb, &session->reorder_q);
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+ skb_orphan(skb);
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+
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+ tunnel->stats.rx_packets++;
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+ tunnel->stats.rx_bytes += length;
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+ session->stats.rx_packets++;
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+ session->stats.rx_bytes += length;
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+
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|
|
+ if (PPPOL2TP_SKB_CB(skb)->has_seq) {
|
|
|
+ /* Bump our Nr */
|
|
|
+ session->nr++;
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
|
|
|
+ "%s: updated nr to %hu\n", session->name, session->nr);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* If the socket is bound, send it in to PPP's input queue. Otherwise
|
|
|
+ * queue it on the session socket.
|
|
|
+ */
|
|
|
+ session_sock = session->sock;
|
|
|
+ if (session_sock->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, length);
|
|
|
+
|
|
|
+ /* 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);
|
|
|
+ dst_release(skb->dst);
|
|
|
+ skb->dst = NULL;
|
|
|
+ nf_reset(skb);
|
|
|
+
|
|
|
+ po = pppox_sk(session_sock);
|
|
|
+ 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);
|
|
|
+ }
|
|
|
+
|
|
|
+ sock_put(session->sock);
|
|
|
+}
|
|
|
+
|
|
|
+/* 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 pppol2tp_recv_dequeue(struct pppol2tp_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.
|
|
|
+ */
|
|
|
+ spin_lock(&session->reorder_q.lock);
|
|
|
+ skb_queue_walk_safe(&session->reorder_q, skb, tmp) {
|
|
|
+ if (time_after(jiffies, PPPOL2TP_SKB_CB(skb)->expires)) {
|
|
|
+ session->stats.rx_seq_discards++;
|
|
|
+ session->stats.rx_errors++;
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
|
|
|
+ "%s: oos pkt %hu len %d discarded (too old), "
|
|
|
+ "waiting for %hu, reorder_q_len=%d\n",
|
|
|
+ session->name, PPPOL2TP_SKB_CB(skb)->ns,
|
|
|
+ PPPOL2TP_SKB_CB(skb)->length, session->nr,
|
|
|
+ skb_queue_len(&session->reorder_q));
|
|
|
+ __skb_unlink(skb, &session->reorder_q);
|
|
|
+ kfree_skb(skb);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (PPPOL2TP_SKB_CB(skb)->has_seq) {
|
|
|
+ if (PPPOL2TP_SKB_CB(skb)->ns != session->nr) {
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
|
|
|
+ "%s: holding oos pkt %hu len %d, "
|
|
|
+ "waiting for %hu, reorder_q_len=%d\n",
|
|
|
+ session->name, PPPOL2TP_SKB_CB(skb)->ns,
|
|
|
+ PPPOL2TP_SKB_CB(skb)->length, session->nr,
|
|
|
+ skb_queue_len(&session->reorder_q));
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ spin_unlock(&session->reorder_q.lock);
|
|
|
+ pppol2tp_recv_dequeue_skb(session, skb);
|
|
|
+ spin_lock(&session->reorder_q.lock);
|
|
|
+ }
|
|
|
+
|
|
|
+out:
|
|
|
+ spin_unlock(&session->reorder_q.lock);
|
|
|
+}
|
|
|
+
|
|
|
+/* Internal 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 pppol2tp_recv_core(struct sock *sock, struct sk_buff *skb)
|
|
|
+{
|
|
|
+ struct pppol2tp_session *session = NULL;
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+ unsigned char *ptr;
|
|
|
+ u16 hdrflags;
|
|
|
+ u16 tunnel_id, session_id;
|
|
|
+ int length;
|
|
|
+ struct udphdr *uh;
|
|
|
+
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(sock);
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto error;
|
|
|
+
|
|
|
+ /* Short packet? */
|
|
|
+ if (skb->len < sizeof(struct udphdr)) {
|
|
|
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
|
|
|
+ "%s: recv short packet (len=%d)\n", tunnel->name, skb->len);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Point to L2TP header */
|
|
|
+ ptr = skb->data + sizeof(struct udphdr);
|
|
|
+
|
|
|
+ /* Get L2TP header flags */
|
|
|
+ hdrflags = ntohs(*(__be16*)ptr);
|
|
|
+
|
|
|
+ /* Trace packet contents, if enabled */
|
|
|
+ if (tunnel->debug & PPPOL2TP_MSG_DATA) {
|
|
|
+ printk(KERN_DEBUG "%s: recv: ", tunnel->name);
|
|
|
+
|
|
|
+ for (length = 0; length < 16; length++)
|
|
|
+ printk(" %02X", ptr[length]);
|
|
|
+ printk("\n");
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Get length of L2TP packet */
|
|
|
+ uh = (struct udphdr *) skb_transport_header(skb);
|
|
|
+ length = ntohs(uh->len) - sizeof(struct udphdr);
|
|
|
+
|
|
|
+ /* Too short? */
|
|
|
+ if (length < 12) {
|
|
|
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
|
|
|
+ "%s: recv short L2TP packet (len=%d)\n", tunnel->name, length);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* If type is control packet, it is handled by userspace. */
|
|
|
+ if (hdrflags & L2TP_HDRFLAG_T) {
|
|
|
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
|
|
|
+ "%s: recv control packet, len=%d\n", tunnel->name, length);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Skip flags */
|
|
|
+ ptr += 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;
|
|
|
+
|
|
|
+ /* Find the session context */
|
|
|
+ session = pppol2tp_session_find(tunnel, session_id);
|
|
|
+ if (!session) {
|
|
|
+ /* Not found? Pass to userspace to deal with */
|
|
|
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
|
|
|
+ "%s: no socket found (%hu/%hu). Passing up.\n",
|
|
|
+ tunnel->name, tunnel_id, session_id);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ sock_hold(session->sock);
|
|
|
+
|
|
|
+ /* The ref count on the socket was increased by the above call since
|
|
|
+ * we now hold a pointer to the session. Take care to do sock_put()
|
|
|
+ * when exiting this function from now on...
|
|
|
+ */
|
|
|
+
|
|
|
+ /* Handle the optional sequence numbers. 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.
|
|
|
+ */
|
|
|
+ if (hdrflags & L2TP_HDRFLAG_S) {
|
|
|
+ u16 ns, nr;
|
|
|
+ ns = ntohs(*(__be16 *) ptr);
|
|
|
+ ptr += 2;
|
|
|
+ nr = ntohs(*(__be16 *) ptr);
|
|
|
+ ptr += 2;
|
|
|
+
|
|
|
+ /* 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, PPPOL2TP_MSG_SEQ, KERN_INFO,
|
|
|
+ "%s: requested to enable seq numbers by LNS\n",
|
|
|
+ session->name);
|
|
|
+ session->send_seq = -1;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Store L2TP info in the skb */
|
|
|
+ PPPOL2TP_SKB_CB(skb)->ns = ns;
|
|
|
+ PPPOL2TP_SKB_CB(skb)->nr = nr;
|
|
|
+ PPPOL2TP_SKB_CB(skb)->has_seq = 1;
|
|
|
+
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
|
|
|
+ "%s: recv data ns=%hu, nr=%hu, session nr=%hu\n",
|
|
|
+ session->name, ns, nr, session->nr);
|
|
|
+ } else {
|
|
|
+ /* No sequence numbers.
|
|
|
+ * If user has configured mandatory sequence numbers, discard.
|
|
|
+ */
|
|
|
+ if (session->recv_seq) {
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_WARNING,
|
|
|
+ "%s: recv data has no seq numbers when required. "
|
|
|
+ "Discarding\n", session->name);
|
|
|
+ session->stats.rx_seq_discards++;
|
|
|
+ session->stats.rx_errors++;
|
|
|
+ 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, PPPOL2TP_MSG_SEQ, KERN_INFO,
|
|
|
+ "%s: requested to disable seq numbers by LNS\n",
|
|
|
+ session->name);
|
|
|
+ session->send_seq = 0;
|
|
|
+ } else if (session->send_seq) {
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_WARNING,
|
|
|
+ "%s: recv data has no seq numbers when required. "
|
|
|
+ "Discarding\n", session->name);
|
|
|
+ session->stats.rx_seq_discards++;
|
|
|
+ session->stats.rx_errors++;
|
|
|
+ goto discard;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Store L2TP info in the skb */
|
|
|
+ PPPOL2TP_SKB_CB(skb)->has_seq = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* If offset bit set, skip it. */
|
|
|
+ if (hdrflags & L2TP_HDRFLAG_O)
|
|
|
+ ptr += 2 + ntohs(*(__be16 *) ptr);
|
|
|
+
|
|
|
+ skb_pull(skb, ptr - skb->data);
|
|
|
+
|
|
|
+ /* 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 ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
|
|
|
+ skb_pull(skb, 2);
|
|
|
+
|
|
|
+ /* Prepare skb for adding to the session's reorder_q. Hold
|
|
|
+ * packets for max reorder_timeout or 1 second if not
|
|
|
+ * reordering.
|
|
|
+ */
|
|
|
+ PPPOL2TP_SKB_CB(skb)->length = length;
|
|
|
+ PPPOL2TP_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 (PPPOL2TP_SKB_CB(skb)->has_seq) {
|
|
|
+ if (session->reorder_timeout != 0) {
|
|
|
+ /* Packet reordering enabled. Add skb to session's
|
|
|
+ * reorder queue, in order of ns.
|
|
|
+ */
|
|
|
+ pppol2tp_recv_queue_skb(session, skb);
|
|
|
+ } else {
|
|
|
+ /* Packet reordering disabled. Discard out-of-sequence
|
|
|
+ * packets
|
|
|
+ */
|
|
|
+ if (PPPOL2TP_SKB_CB(skb)->ns != session->nr) {
|
|
|
+ session->stats.rx_seq_discards++;
|
|
|
+ session->stats.rx_errors++;
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
|
|
|
+ "%s: oos pkt %hu len %d discarded, "
|
|
|
+ "waiting for %hu, reorder_q_len=%d\n",
|
|
|
+ session->name, PPPOL2TP_SKB_CB(skb)->ns,
|
|
|
+ PPPOL2TP_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. */
|
|
|
+ pppol2tp_recv_dequeue(session);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+discard:
|
|
|
+ kfree_skb(skb);
|
|
|
+ sock_put(session->sock);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+error:
|
|
|
+ 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.
|
|
|
+ */
|
|
|
+static int pppol2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
|
|
|
+{
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(sk);
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto pass_up;
|
|
|
+
|
|
|
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
|
|
|
+ "%s: received %d bytes\n", tunnel->name, skb->len);
|
|
|
+
|
|
|
+ if (pppol2tp_recv_core(sk, skb))
|
|
|
+ goto pass_up;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+pass_up:
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+/* 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;
|
|
|
+
|
|
|
+ msg->msg_namelen = 0;
|
|
|
+
|
|
|
+ err = 0;
|
|
|
+ skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
|
|
|
+ flags & MSG_DONTWAIT, &err);
|
|
|
+ if (skb) {
|
|
|
+ err = memcpy_toiovec(msg->msg_iov, (unsigned char *) skb->data,
|
|
|
+ skb->len);
|
|
|
+ if (err < 0)
|
|
|
+ goto do_skb_free;
|
|
|
+ err = skb->len;
|
|
|
+ }
|
|
|
+do_skb_free:
|
|
|
+ kfree_skb(skb);
|
|
|
+end:
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+/************************************************************************
|
|
|
+ * Transmit handling
|
|
|
+ ***********************************************************************/
|
|
|
+
|
|
|
+/* Tell how big L2TP headers are for a particular session. This
|
|
|
+ * depends on whether sequence numbers are being used.
|
|
|
+ */
|
|
|
+static inline int pppol2tp_l2tp_header_len(struct pppol2tp_session *session)
|
|
|
+{
|
|
|
+ if (session->send_seq)
|
|
|
+ return PPPOL2TP_L2TP_HDR_SIZE_SEQ;
|
|
|
+
|
|
|
+ return PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
|
|
|
+}
|
|
|
+
|
|
|
+/* Build an L2TP header for the session into the buffer provided.
|
|
|
+ */
|
|
|
+static void pppol2tp_build_l2tp_header(struct pppol2tp_session *session,
|
|
|
+ void *buf)
|
|
|
+{
|
|
|
+ __be16 *bufp = buf;
|
|
|
+ u16 flags = L2TP_HDR_VER;
|
|
|
+
|
|
|
+ if (session->send_seq)
|
|
|
+ flags |= L2TP_HDRFLAG_S;
|
|
|
+
|
|
|
+ /* Setup L2TP header.
|
|
|
+ * FIXME: Can this ever be unaligned? Is direct dereferencing of
|
|
|
+ * 16-bit header fields safe here for all architectures?
|
|
|
+ */
|
|
|
+ *bufp++ = htons(flags);
|
|
|
+ *bufp++ = htons(session->tunnel_addr.d_tunnel);
|
|
|
+ *bufp++ = htons(session->tunnel_addr.d_session);
|
|
|
+ if (session->send_seq) {
|
|
|
+ *bufp++ = htons(session->ns);
|
|
|
+ *bufp++ = 0;
|
|
|
+ session->ns++;
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
|
|
|
+ "%s: updated ns to %hu\n", session->name, session->ns);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* 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 inet_sock *inet;
|
|
|
+ __wsum csum = 0;
|
|
|
+ struct sk_buff *skb;
|
|
|
+ int error;
|
|
|
+ int hdr_len;
|
|
|
+ struct pppol2tp_session *session;
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+ struct udphdr *uh;
|
|
|
+
|
|
|
+ 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;
|
|
|
+
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock);
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto error;
|
|
|
+
|
|
|
+ /* What header length is configured for this session? */
|
|
|
+ hdr_len = pppol2tp_l2tp_header_len(session);
|
|
|
+
|
|
|
+ /* Allocate a socket buffer */
|
|
|
+ error = -ENOMEM;
|
|
|
+ skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
|
|
|
+ sizeof(struct udphdr) + hdr_len +
|
|
|
+ sizeof(ppph) + total_len,
|
|
|
+ 0, GFP_KERNEL);
|
|
|
+ if (!skb)
|
|
|
+ goto error;
|
|
|
+
|
|
|
+ /* 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);
|
|
|
+
|
|
|
+ /* Build UDP header */
|
|
|
+ inet = inet_sk(session->tunnel_sock);
|
|
|
+ uh = (struct udphdr *) skb->data;
|
|
|
+ uh->source = inet->sport;
|
|
|
+ uh->dest = inet->dport;
|
|
|
+ uh->len = htons(hdr_len + sizeof(ppph) + total_len);
|
|
|
+ uh->check = 0;
|
|
|
+ skb_put(skb, sizeof(struct udphdr));
|
|
|
+
|
|
|
+ /* Build L2TP header */
|
|
|
+ pppol2tp_build_l2tp_header(session, skb->data);
|
|
|
+ skb_put(skb, hdr_len);
|
|
|
+
|
|
|
+ /* 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->data, m->msg_iov, total_len);
|
|
|
+ if (error < 0) {
|
|
|
+ kfree_skb(skb);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ skb_put(skb, total_len);
|
|
|
+
|
|
|
+ /* Calculate UDP checksum if configured to do so */
|
|
|
+ if (session->tunnel_sock->sk_no_check != UDP_CSUM_NOXMIT)
|
|
|
+ csum = udp_csum_outgoing(sk, skb);
|
|
|
+
|
|
|
+ /* Debug */
|
|
|
+ if (session->send_seq)
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
|
|
|
+ "%s: send %Zd bytes, ns=%hu\n", session->name,
|
|
|
+ total_len, session->ns - 1);
|
|
|
+ else
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
|
|
|
+ "%s: send %Zd bytes\n", session->name, total_len);
|
|
|
+
|
|
|
+ if (session->debug & PPPOL2TP_MSG_DATA) {
|
|
|
+ int i;
|
|
|
+ unsigned char *datap = skb->data;
|
|
|
+
|
|
|
+ printk(KERN_DEBUG "%s: xmit:", session->name);
|
|
|
+ for (i = 0; i < total_len; i++) {
|
|
|
+ printk(" %02X", *datap++);
|
|
|
+ if (i == 15) {
|
|
|
+ printk(" ...");
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ printk("\n");
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Queue the packet to IP for output */
|
|
|
+ error = ip_queue_xmit(skb, 1);
|
|
|
+
|
|
|
+ /* Update stats */
|
|
|
+ if (error >= 0) {
|
|
|
+ tunnel->stats.tx_packets++;
|
|
|
+ tunnel->stats.tx_bytes += skb->len;
|
|
|
+ session->stats.tx_packets++;
|
|
|
+ session->stats.tx_bytes += skb->len;
|
|
|
+ } else {
|
|
|
+ tunnel->stats.tx_errors++;
|
|
|
+ session->stats.tx_errors++;
|
|
|
+ }
|
|
|
+
|
|
|
+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;
|
|
|
+ int hdr_len;
|
|
|
+ struct pppol2tp_session *session;
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+ int rc;
|
|
|
+ int headroom;
|
|
|
+ int data_len = skb->len;
|
|
|
+ struct inet_sock *inet;
|
|
|
+ __wsum csum = 0;
|
|
|
+ struct sk_buff *skb2 = NULL;
|
|
|
+ struct udphdr *uh;
|
|
|
+
|
|
|
+ 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;
|
|
|
+
|
|
|
+ sk_tun = session->tunnel_sock;
|
|
|
+ if (sk_tun == NULL)
|
|
|
+ goto abort;
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(sk_tun);
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto abort;
|
|
|
+
|
|
|
+ /* What header length is configured for this session? */
|
|
|
+ hdr_len = pppol2tp_l2tp_header_len(session);
|
|
|
+
|
|
|
+ /* Check that there's enough headroom in the skb to insert IP,
|
|
|
+ * UDP and L2TP and PPP headers. If not enough, expand it to
|
|
|
+ * make room. Note that a new skb (or a clone) is
|
|
|
+ * allocated. If we return an error from this point on, make
|
|
|
+ * sure we free the new skb but do not free the original skb
|
|
|
+ * since that is done by the caller for the error case.
|
|
|
+ */
|
|
|
+ headroom = NET_SKB_PAD + sizeof(struct iphdr) +
|
|
|
+ sizeof(struct udphdr) + hdr_len + sizeof(ppph);
|
|
|
+ if (skb_headroom(skb) < headroom) {
|
|
|
+ skb2 = skb_realloc_headroom(skb, headroom);
|
|
|
+ if (skb2 == NULL)
|
|
|
+ goto abort;
|
|
|
+ } else
|
|
|
+ skb2 = skb;
|
|
|
+
|
|
|
+ /* Check that the socket has room */
|
|
|
+ if (atomic_read(&sk_tun->sk_wmem_alloc) < sk_tun->sk_sndbuf)
|
|
|
+ skb_set_owner_w(skb2, sk_tun);
|
|
|
+ else
|
|
|
+ goto discard;
|
|
|
+
|
|
|
+ /* Setup PPP header */
|
|
|
+ skb_push(skb2, sizeof(ppph));
|
|
|
+ skb2->data[0] = ppph[0];
|
|
|
+ skb2->data[1] = ppph[1];
|
|
|
+
|
|
|
+ /* Setup L2TP header */
|
|
|
+ skb_push(skb2, hdr_len);
|
|
|
+ pppol2tp_build_l2tp_header(session, skb2->data);
|
|
|
+
|
|
|
+ /* Setup UDP header */
|
|
|
+ inet = inet_sk(sk_tun);
|
|
|
+ skb_push(skb2, sizeof(struct udphdr));
|
|
|
+ skb_reset_transport_header(skb2);
|
|
|
+ uh = (struct udphdr *) skb2->data;
|
|
|
+ uh->source = inet->sport;
|
|
|
+ uh->dest = inet->dport;
|
|
|
+ uh->len = htons(sizeof(struct udphdr) + hdr_len + sizeof(ppph) + data_len);
|
|
|
+ uh->check = 0;
|
|
|
+
|
|
|
+ /* Calculate UDP checksum if configured to do so */
|
|
|
+ if (sk_tun->sk_no_check != UDP_CSUM_NOXMIT)
|
|
|
+ csum = udp_csum_outgoing(sk_tun, skb2);
|
|
|
+
|
|
|
+ /* Debug */
|
|
|
+ if (session->send_seq)
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
|
|
|
+ "%s: send %d bytes, ns=%hu\n", session->name,
|
|
|
+ data_len, session->ns - 1);
|
|
|
+ else
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
|
|
|
+ "%s: send %d bytes\n", session->name, data_len);
|
|
|
+
|
|
|
+ if (session->debug & PPPOL2TP_MSG_DATA) {
|
|
|
+ int i;
|
|
|
+ unsigned char *datap = skb2->data;
|
|
|
+
|
|
|
+ printk(KERN_DEBUG "%s: xmit:", session->name);
|
|
|
+ for (i = 0; i < data_len; i++) {
|
|
|
+ printk(" %02X", *datap++);
|
|
|
+ if (i == 31) {
|
|
|
+ printk(" ...");
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ printk("\n");
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Get routing info from the tunnel socket */
|
|
|
+ skb2->dst = sk_dst_get(sk_tun);
|
|
|
+
|
|
|
+ /* Queue the packet to IP for output */
|
|
|
+ rc = ip_queue_xmit(skb2, 1);
|
|
|
+
|
|
|
+ /* Update stats */
|
|
|
+ if (rc >= 0) {
|
|
|
+ tunnel->stats.tx_packets++;
|
|
|
+ tunnel->stats.tx_bytes += skb2->len;
|
|
|
+ session->stats.tx_packets++;
|
|
|
+ session->stats.tx_bytes += skb2->len;
|
|
|
+ } else {
|
|
|
+ tunnel->stats.tx_errors++;
|
|
|
+ session->stats.tx_errors++;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Free the original skb */
|
|
|
+ kfree_skb(skb);
|
|
|
+
|
|
|
+ return 1;
|
|
|
+
|
|
|
+discard:
|
|
|
+ /* Free the new skb. Caller will free original skb. */
|
|
|
+ if (skb2 != skb)
|
|
|
+ kfree_skb(skb2);
|
|
|
+abort:
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/*****************************************************************************
|
|
|
+ * Session (and tunnel control) socket create/destroy.
|
|
|
+ *****************************************************************************/
|
|
|
+
|
|
|
+/* When the tunnel UDP socket is closed, all the attached sockets need to go
|
|
|
+ * too.
|
|
|
+ */
|
|
|
+static void pppol2tp_tunnel_closeall(struct pppol2tp_tunnel *tunnel)
|
|
|
+{
|
|
|
+ int hash;
|
|
|
+ struct hlist_node *walk;
|
|
|
+ struct hlist_node *tmp;
|
|
|
+ struct pppol2tp_session *session;
|
|
|
+ struct sock *sk;
|
|
|
+
|
|
|
+ if (tunnel == NULL)
|
|
|
+ BUG();
|
|
|
+
|
|
|
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
|
+ "%s: closing all sessions...\n", tunnel->name);
|
|
|
+
|
|
|
+ write_lock(&tunnel->hlist_lock);
|
|
|
+ for (hash = 0; hash < PPPOL2TP_HASH_SIZE; hash++) {
|
|
|
+again:
|
|
|
+ hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
|
|
|
+ session = hlist_entry(walk, struct pppol2tp_session, hlist);
|
|
|
+
|
|
|
+ sk = session->sock;
|
|
|
+
|
|
|
+ PRINTK(session->debug, PPPOL2TP_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.
|
|
|
+ */
|
|
|
+ sock_hold(sk);
|
|
|
+ write_unlock(&tunnel->hlist_lock);
|
|
|
+ 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);
|
|
|
+ skb_queue_purge(&session->reorder_q);
|
|
|
+
|
|
|
+ release_sock(sk);
|
|
|
+ sock_put(sk);
|
|
|
+
|
|
|
+ /* 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.
|
|
|
+ */
|
|
|
+ write_lock(&tunnel->hlist_lock);
|
|
|
+ goto again;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ write_unlock(&tunnel->hlist_lock);
|
|
|
+}
|
|
|
+
|
|
|
+/* Really kill the tunnel.
|
|
|
+ * Come here only when all sessions have been cleared from the tunnel.
|
|
|
+ */
|
|
|
+static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel)
|
|
|
+{
|
|
|
+ /* Remove from socket list */
|
|
|
+ write_lock(&pppol2tp_tunnel_list_lock);
|
|
|
+ list_del_init(&tunnel->list);
|
|
|
+ write_unlock(&pppol2tp_tunnel_list_lock);
|
|
|
+
|
|
|
+ atomic_dec(&pppol2tp_tunnel_count);
|
|
|
+ kfree(tunnel);
|
|
|
+}
|
|
|
+
|
|
|
+/* Tunnel UDP socket destruct hook.
|
|
|
+ * The tunnel context is deleted only when all session sockets have been
|
|
|
+ * closed.
|
|
|
+ */
|
|
|
+static void pppol2tp_tunnel_destruct(struct sock *sk)
|
|
|
+{
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(sk);
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
|
+ "%s: closing...\n", tunnel->name);
|
|
|
+
|
|
|
+ /* Close all sessions */
|
|
|
+ pppol2tp_tunnel_closeall(tunnel);
|
|
|
+
|
|
|
+ /* No longer an encapsulation socket. See net/ipv4/udp.c */
|
|
|
+ (udp_sk(sk))->encap_type = 0;
|
|
|
+ (udp_sk(sk))->encap_rcv = NULL;
|
|
|
+
|
|
|
+ /* Remove hooks into tunnel socket */
|
|
|
+ tunnel->sock = NULL;
|
|
|
+ sk->sk_destruct = tunnel->old_sk_destruct;
|
|
|
+ sk->sk_user_data = NULL;
|
|
|
+
|
|
|
+ /* Call original (UDP) socket descructor */
|
|
|
+ if (sk->sk_destruct != NULL)
|
|
|
+ (*sk->sk_destruct)(sk);
|
|
|
+
|
|
|
+ pppol2tp_tunnel_dec_refcount(tunnel);
|
|
|
+
|
|
|
+end:
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+/* Really kill the session socket. (Called from sock_put() if
|
|
|
+ * refcnt == 0.)
|
|
|
+ */
|
|
|
+static void pppol2tp_session_destruct(struct sock *sk)
|
|
|
+{
|
|
|
+ struct pppol2tp_session *session = NULL;
|
|
|
+
|
|
|
+ if (sk->sk_user_data != NULL) {
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+
|
|
|
+ session = pppol2tp_sock_to_session(sk);
|
|
|
+ if (session == NULL)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ /* Don't use pppol2tp_sock_to_tunnel() here to
|
|
|
+ * get the tunnel context because the tunnel
|
|
|
+ * socket might have already been closed (its
|
|
|
+ * sk->sk_user_data will be NULL) so use the
|
|
|
+ * session's private tunnel ptr instead.
|
|
|
+ */
|
|
|
+ tunnel = session->tunnel;
|
|
|
+ if (tunnel != NULL) {
|
|
|
+ BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
|
|
|
+
|
|
|
+ /* If session_id is zero, this is a null
|
|
|
+ * session context, which was created for a
|
|
|
+ * socket that is being used only to manage
|
|
|
+ * tunnels.
|
|
|
+ */
|
|
|
+ if (session->tunnel_addr.s_session != 0) {
|
|
|
+ /* Delete the session socket from the
|
|
|
+ * hash
|
|
|
+ */
|
|
|
+ write_lock(&tunnel->hlist_lock);
|
|
|
+ hlist_del_init(&session->hlist);
|
|
|
+ write_unlock(&tunnel->hlist_lock);
|
|
|
+
|
|
|
+ atomic_dec(&pppol2tp_session_count);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* This will delete the tunnel context if this
|
|
|
+ * is the last session on the tunnel.
|
|
|
+ */
|
|
|
+ session->tunnel = NULL;
|
|
|
+ session->tunnel_sock = NULL;
|
|
|
+ pppol2tp_tunnel_dec_refcount(tunnel);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ kfree(session);
|
|
|
+out:
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+/* Called when the PPPoX socket (session) is closed.
|
|
|
+ */
|
|
|
+static int pppol2tp_release(struct socket *sock)
|
|
|
+{
|
|
|
+ struct sock *sk = sock->sk;
|
|
|
+ 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;
|
|
|
+
|
|
|
+ /* Purge any queued data */
|
|
|
+ skb_queue_purge(&sk->sk_receive_queue);
|
|
|
+ skb_queue_purge(&sk->sk_write_queue);
|
|
|
+
|
|
|
+ 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;
|
|
|
+}
|
|
|
+
|
|
|
+/* Internal function to prepare a tunnel (UDP) socket to have PPPoX
|
|
|
+ * sockets attached to it.
|
|
|
+ */
|
|
|
+static struct sock *pppol2tp_prepare_tunnel_socket(int fd, u16 tunnel_id,
|
|
|
+ int *error)
|
|
|
+{
|
|
|
+ int err;
|
|
|
+ struct socket *sock = NULL;
|
|
|
+ struct sock *sk;
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+ struct sock *ret = NULL;
|
|
|
+
|
|
|
+ /* Get the tunnel UDP socket from the fd, which was opened by
|
|
|
+ * the userspace L2TP daemon.
|
|
|
+ */
|
|
|
+ err = -EBADF;
|
|
|
+ sock = sockfd_lookup(fd, &err);
|
|
|
+ if (!sock) {
|
|
|
+ PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR,
|
|
|
+ "tunl %hu: sockfd_lookup(fd=%d) returned %d\n",
|
|
|
+ tunnel_id, fd, err);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Quick sanity checks */
|
|
|
+ err = -ESOCKTNOSUPPORT;
|
|
|
+ if (sock->type != SOCK_DGRAM) {
|
|
|
+ PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR,
|
|
|
+ "tunl %hu: fd %d wrong type, got %d, expected %d\n",
|
|
|
+ tunnel_id, fd, sock->type, SOCK_DGRAM);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ err = -EAFNOSUPPORT;
|
|
|
+ if (sock->ops->family != AF_INET) {
|
|
|
+ PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR,
|
|
|
+ "tunl %hu: fd %d wrong family, got %d, expected %d\n",
|
|
|
+ tunnel_id, fd, sock->ops->family, AF_INET);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = -ENOTCONN;
|
|
|
+ sk = sock->sk;
|
|
|
+
|
|
|
+ /* Check if this socket has already been prepped */
|
|
|
+ tunnel = (struct pppol2tp_tunnel *)sk->sk_user_data;
|
|
|
+ if (tunnel != NULL) {
|
|
|
+ /* User-data field already set */
|
|
|
+ err = -EBUSY;
|
|
|
+ BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
|
|
|
+
|
|
|
+ /* This socket has already been prepped */
|
|
|
+ ret = tunnel->sock;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* This socket is available and needs prepping. Create a new tunnel
|
|
|
+ * context and init it.
|
|
|
+ */
|
|
|
+ sk->sk_user_data = tunnel = kzalloc(sizeof(struct pppol2tp_tunnel), GFP_KERNEL);
|
|
|
+ if (sk->sk_user_data == NULL) {
|
|
|
+ err = -ENOMEM;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ tunnel->magic = L2TP_TUNNEL_MAGIC;
|
|
|
+ sprintf(&tunnel->name[0], "tunl %hu", tunnel_id);
|
|
|
+
|
|
|
+ tunnel->stats.tunnel_id = tunnel_id;
|
|
|
+ tunnel->debug = PPPOL2TP_DEFAULT_DEBUG_FLAGS;
|
|
|
+
|
|
|
+ /* 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 = &pppol2tp_tunnel_destruct;
|
|
|
+
|
|
|
+ tunnel->sock = sk;
|
|
|
+ sk->sk_allocation = GFP_ATOMIC;
|
|
|
+
|
|
|
+ /* Misc init */
|
|
|
+ rwlock_init(&tunnel->hlist_lock);
|
|
|
+
|
|
|
+ /* Add tunnel to our list */
|
|
|
+ INIT_LIST_HEAD(&tunnel->list);
|
|
|
+ write_lock(&pppol2tp_tunnel_list_lock);
|
|
|
+ list_add(&tunnel->list, &pppol2tp_tunnel_list);
|
|
|
+ write_unlock(&pppol2tp_tunnel_list_lock);
|
|
|
+ atomic_inc(&pppol2tp_tunnel_count);
|
|
|
+
|
|
|
+ /* Bump the reference count. The tunnel context is deleted
|
|
|
+ * only when this drops to zero.
|
|
|
+ */
|
|
|
+ pppol2tp_tunnel_inc_refcount(tunnel);
|
|
|
+
|
|
|
+ /* Mark socket as an encapsulation socket. See net/ipv4/udp.c */
|
|
|
+ (udp_sk(sk))->encap_type = UDP_ENCAP_L2TPINUDP;
|
|
|
+ (udp_sk(sk))->encap_rcv = pppol2tp_udp_encap_recv;
|
|
|
+
|
|
|
+ ret = tunnel->sock;
|
|
|
+
|
|
|
+ *error = 0;
|
|
|
+out:
|
|
|
+ if (sock)
|
|
|
+ sockfd_put(sock);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+
|
|
|
+err:
|
|
|
+ *error = err;
|
|
|
+ goto out;
|
|
|
+}
|
|
|
+
|
|
|
+static struct proto pppol2tp_sk_proto = {
|
|
|
+ .name = "PPPOL2TP",
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ .obj_size = sizeof(struct pppox_sock),
|
|
|
+};
|
|
|
+
|
|
|
+/* socket() handler. Initialize a new struct sock.
|
|
|
+ */
|
|
|
+static int pppol2tp_create(struct socket *sock)
|
|
|
+{
|
|
|
+ int error = -ENOMEM;
|
|
|
+ struct sock *sk;
|
|
|
+
|
|
|
+ sk = sk_alloc(PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, 1);
|
|
|
+ if (!sk)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ sock_init_data(sock, sk);
|
|
|
+
|
|
|
+ sock->state = SS_UNCONNECTED;
|
|
|
+ sock->ops = &pppol2tp_ops;
|
|
|
+
|
|
|
+ sk->sk_backlog_rcv = pppol2tp_recv_core;
|
|
|
+ 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;
|
|
|
+}
|
|
|
+
|
|
|
+/* 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 pppox_sock *po = pppox_sk(sk);
|
|
|
+ struct sock *tunnel_sock = NULL;
|
|
|
+ struct pppol2tp_session *session = NULL;
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+ struct dst_entry *dst;
|
|
|
+ int error = 0;
|
|
|
+
|
|
|
+ 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 */
|
|
|
+
|
|
|
+ /* Don't bind if s_tunnel is 0 */
|
|
|
+ error = -EINVAL;
|
|
|
+ if (sp->pppol2tp.s_tunnel == 0)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ /* Special case: prepare tunnel socket if s_session and
|
|
|
+ * d_session is 0. Otherwise look up tunnel using supplied
|
|
|
+ * tunnel id.
|
|
|
+ */
|
|
|
+ if ((sp->pppol2tp.s_session == 0) && (sp->pppol2tp.d_session == 0)) {
|
|
|
+ tunnel_sock = pppol2tp_prepare_tunnel_socket(sp->pppol2tp.fd,
|
|
|
+ sp->pppol2tp.s_tunnel,
|
|
|
+ &error);
|
|
|
+ if (tunnel_sock == NULL)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ tunnel = tunnel_sock->sk_user_data;
|
|
|
+ } else {
|
|
|
+ tunnel = pppol2tp_tunnel_find(sp->pppol2tp.s_tunnel);
|
|
|
+
|
|
|
+ /* Error if we can't find the tunnel */
|
|
|
+ error = -ENOENT;
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ tunnel_sock = tunnel->sock;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Check that this session doesn't already exist */
|
|
|
+ error = -EEXIST;
|
|
|
+ session = pppol2tp_session_find(tunnel, sp->pppol2tp.s_session);
|
|
|
+ if (session != NULL)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ /* Allocate and initialize a new session context. */
|
|
|
+ session = kzalloc(sizeof(struct pppol2tp_session), GFP_KERNEL);
|
|
|
+ if (session == NULL) {
|
|
|
+ error = -ENOMEM;
|
|
|
+ goto end;
|
|
|
+ }
|
|
|
+
|
|
|
+ skb_queue_head_init(&session->reorder_q);
|
|
|
+
|
|
|
+ session->magic = L2TP_SESSION_MAGIC;
|
|
|
+ session->owner = current->pid;
|
|
|
+ session->sock = sk;
|
|
|
+ session->tunnel = tunnel;
|
|
|
+ session->tunnel_sock = tunnel_sock;
|
|
|
+ session->tunnel_addr = sp->pppol2tp;
|
|
|
+ sprintf(&session->name[0], "sess %hu/%hu",
|
|
|
+ session->tunnel_addr.s_tunnel,
|
|
|
+ session->tunnel_addr.s_session);
|
|
|
+
|
|
|
+ session->stats.tunnel_id = session->tunnel_addr.s_tunnel;
|
|
|
+ session->stats.session_id = session->tunnel_addr.s_session;
|
|
|
+
|
|
|
+ INIT_HLIST_NODE(&session->hlist);
|
|
|
+
|
|
|
+ /* Inherit debug options from tunnel */
|
|
|
+ session->debug = tunnel->debug;
|
|
|
+
|
|
|
+ /* Default MTU must allow space for UDP/L2TP/PPP
|
|
|
+ * headers.
|
|
|
+ */
|
|
|
+ session->mtu = session->mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
|
|
|
+
|
|
|
+ /* If PMTU discovery was enabled, use the MTU that was discovered */
|
|
|
+ dst = sk_dst_get(sk);
|
|
|
+ if (dst != NULL) {
|
|
|
+ u32 pmtu = dst_mtu(__sk_dst_get(sk));
|
|
|
+ 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. Don't add the session to the
|
|
|
+ * session hash list, just set up the internal context for use by
|
|
|
+ * ioctl() and sockopt() handlers.
|
|
|
+ */
|
|
|
+ if ((session->tunnel_addr.s_session == 0) &&
|
|
|
+ (session->tunnel_addr.d_session == 0)) {
|
|
|
+ error = 0;
|
|
|
+ sk->sk_user_data = session;
|
|
|
+ goto out_no_ppp;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Get tunnel context from the tunnel socket */
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(tunnel_sock);
|
|
|
+ if (tunnel == NULL) {
|
|
|
+ error = -EBADF;
|
|
|
+ goto end;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Right now, because we don't have a way to push the incoming skb's
|
|
|
+ * straight through the UDP layer, 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_channel(&po->chan);
|
|
|
+ if (error)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ /* This is how we get the session context from the socket. */
|
|
|
+ sk->sk_user_data = session;
|
|
|
+
|
|
|
+ /* Add session to the tunnel's hash list */
|
|
|
+ write_lock(&tunnel->hlist_lock);
|
|
|
+ hlist_add_head(&session->hlist,
|
|
|
+ pppol2tp_session_id_hash(tunnel,
|
|
|
+ session->tunnel_addr.s_session));
|
|
|
+ write_unlock(&tunnel->hlist_lock);
|
|
|
+
|
|
|
+ atomic_inc(&pppol2tp_session_count);
|
|
|
+
|
|
|
+out_no_ppp:
|
|
|
+ pppol2tp_tunnel_inc_refcount(tunnel);
|
|
|
+ sk->sk_state = PPPOX_CONNECTED;
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
|
+ "%s: created\n", session->name);
|
|
|
+
|
|
|
+end:
|
|
|
+ release_sock(sk);
|
|
|
+
|
|
|
+ if (error != 0)
|
|
|
+ PRINTK(session ? session->debug : -1, PPPOL2TP_MSG_CONTROL, KERN_WARNING,
|
|
|
+ "%s: connect failed: %d\n", session->name, error);
|
|
|
+
|
|
|
+ return error;
|
|
|
+}
|
|
|
+
|
|
|
+/* getname() support.
|
|
|
+ */
|
|
|
+static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
|
+ int *usockaddr_len, int peer)
|
|
|
+{
|
|
|
+ int len = sizeof(struct sockaddr_pppol2tp);
|
|
|
+ struct sockaddr_pppol2tp sp;
|
|
|
+ int error = 0;
|
|
|
+ struct pppol2tp_session *session;
|
|
|
+
|
|
|
+ error = -ENOTCONN;
|
|
|
+ if (sock->sk->sk_state != PPPOX_CONNECTED)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ session = pppol2tp_sock_to_session(sock->sk);
|
|
|
+ if (session == NULL) {
|
|
|
+ error = -EBADF;
|
|
|
+ goto end;
|
|
|
+ }
|
|
|
+
|
|
|
+ sp.sa_family = AF_PPPOX;
|
|
|
+ sp.sa_protocol = PX_PROTO_OL2TP;
|
|
|
+ memcpy(&sp.pppol2tp, &session->tunnel_addr,
|
|
|
+ sizeof(struct pppol2tp_addr));
|
|
|
+
|
|
|
+ memcpy(uaddr, &sp, len);
|
|
|
+
|
|
|
+ *usockaddr_len = len;
|
|
|
+
|
|
|
+ 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.
|
|
|
+ ****************************************************************************/
|
|
|
+
|
|
|
+/* Session ioctl helper.
|
|
|
+ */
|
|
|
+static int pppol2tp_session_ioctl(struct pppol2tp_session *session,
|
|
|
+ unsigned int cmd, unsigned long arg)
|
|
|
+{
|
|
|
+ struct ifreq ifr;
|
|
|
+ int err = 0;
|
|
|
+ struct sock *sk = session->sock;
|
|
|
+ int val = (int) arg;
|
|
|
+
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
|
|
|
+ "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
|
|
|
+ session->name, cmd, arg);
|
|
|
+
|
|
|
+ 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(session->flags, (int __user *) arg))
|
|
|
+ break;
|
|
|
+
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
|
+ "%s: get flags=%d\n", session->name, session->flags);
|
|
|
+ err = 0;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case PPPIOCSFLAGS:
|
|
|
+ err = -EFAULT;
|
|
|
+ if (get_user(val, (int __user *) arg))
|
|
|
+ break;
|
|
|
+ session->flags = val;
|
|
|
+ PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
|
+ "%s: set flags=%d\n", session->name, session->flags);
|
|
|
+ err = 0;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case PPPIOCGL2TPSTATS:
|
|
|
+ err = -ENXIO;
|
|
|
+ if (!(sk->sk_state & PPPOX_CONNECTED))
|
|
|
+ break;
|
|
|
+
|
|
|
+ if (copy_to_user((void __user *) arg, &session->stats,
|
|
|
+ sizeof(session->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 pppol2tp_tunnel *tunnel,
|
|
|
+ unsigned int cmd, unsigned long arg)
|
|
|
+{
|
|
|
+ int err = 0;
|
|
|
+ struct sock *sk = tunnel->sock;
|
|
|
+ struct pppol2tp_ioc_stats stats_req;
|
|
|
+
|
|
|
+ PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
|
|
|
+ "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", tunnel->name,
|
|
|
+ cmd, arg);
|
|
|
+
|
|
|
+ sock_hold(sk);
|
|
|
+
|
|
|
+ switch (cmd) {
|
|
|
+ case PPPIOCGL2TPSTATS:
|
|
|
+ err = -ENXIO;
|
|
|
+ if (!(sk->sk_state & PPPOX_CONNECTED))
|
|
|
+ break;
|
|
|
+
|
|
|
+ if (copy_from_user(&stats_req, (void __user *) arg,
|
|
|
+ sizeof(stats_req))) {
|
|
|
+ err = -EFAULT;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ if (stats_req.session_id != 0) {
|
|
|
+ /* resend to session ioctl handler */
|
|
|
+ struct pppol2tp_session *session =
|
|
|
+ pppol2tp_session_find(tunnel, stats_req.session_id);
|
|
|
+ if (session != NULL)
|
|
|
+ err = pppol2tp_session_ioctl(session, cmd, arg);
|
|
|
+ else
|
|
|
+ err = -EBADR;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+#ifdef CONFIG_XFRM
|
|
|
+ tunnel->stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
|
|
|
+#endif
|
|
|
+ if (copy_to_user((void __user *) arg, &tunnel->stats,
|
|
|
+ sizeof(tunnel->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 pppol2tp_session *session;
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+ 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
|
|
|
+ */
|
|
|
+ if ((session->tunnel_addr.s_session == 0) &&
|
|
|
+ (session->tunnel_addr.d_session == 0)) {
|
|
|
+ err = -EBADF;
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock);
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
|
|
|
+ goto end;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = pppol2tp_session_ioctl(session, cmd, arg);
|
|
|
+
|
|
|
+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 pppol2tp_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 pppol2tp_session *session,
|
|
|
+ int optname, int val)
|
|
|
+{
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ switch (optname) {
|
|
|
+ case PPPOL2TP_SO_RECVSEQ:
|
|
|
+ if ((val != 0) && (val != 1)) {
|
|
|
+ err = -EINVAL;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ session->recv_seq = val ? -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 = session->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, int optlen)
|
|
|
+{
|
|
|
+ struct sock *sk = sock->sk;
|
|
|
+ struct pppol2tp_session *session = sk->sk_user_data;
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+ int val;
|
|
|
+ int err;
|
|
|
+
|
|
|
+ if (level != SOL_PPPOL2TP)
|
|
|
+ return udp_prot.setsockopt(sk, level, optname, optval, optlen);
|
|
|
+
|
|
|
+ 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
|
|
|
+ */
|
|
|
+ if ((session->tunnel_addr.s_session == 0) &&
|
|
|
+ (session->tunnel_addr.d_session == 0)) {
|
|
|
+ err = -EBADF;
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock);
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
|
|
|
+ } else
|
|
|
+ err = pppol2tp_session_setsockopt(sk, session, optname, val);
|
|
|
+
|
|
|
+ err = 0;
|
|
|
+
|
|
|
+end:
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+/* Tunnel getsockopt helper. Called with sock locked.
|
|
|
+ */
|
|
|
+static int pppol2tp_tunnel_getsockopt(struct sock *sk,
|
|
|
+ struct pppol2tp_tunnel *tunnel,
|
|
|
+ int optname, int __user *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 pppol2tp_session *session,
|
|
|
+ int optname, int __user *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 pppol2tp_session *session = sk->sk_user_data;
|
|
|
+ struct pppol2tp_tunnel *tunnel;
|
|
|
+ int val, len;
|
|
|
+ int err;
|
|
|
+
|
|
|
+ if (level != SOL_PPPOL2TP)
|
|
|
+ return udp_prot.getsockopt(sk, level, optname, optval, optlen);
|
|
|
+
|
|
|
+ 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 */
|
|
|
+ if ((session->tunnel_addr.s_session == 0) &&
|
|
|
+ (session->tunnel_addr.d_session == 0)) {
|
|
|
+ err = -EBADF;
|
|
|
+ tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock);
|
|
|
+ if (tunnel == NULL)
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
|
|
|
+ } else
|
|
|
+ err = pppol2tp_session_getsockopt(sk, session, optname, &val);
|
|
|
+
|
|
|
+ err = -EFAULT;
|
|
|
+ if (put_user(len, (int __user *) optlen))
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ if (copy_to_user((void __user *) optval, &val, len))
|
|
|
+ goto end;
|
|
|
+
|
|
|
+ err = 0;
|
|
|
+end:
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+/*****************************************************************************
|
|
|
+ * /proc filesystem for debug
|
|
|
+ *****************************************************************************/
|
|
|
+
|
|
|
+#ifdef CONFIG_PROC_FS
|
|
|
+
|
|
|
+#include <linux/seq_file.h>
|
|
|
+
|
|
|
+struct pppol2tp_seq_data {
|
|
|
+ struct pppol2tp_tunnel *tunnel; /* current tunnel */
|
|
|
+ struct pppol2tp_session *session; /* NULL means get first session in tunnel */
|
|
|
+};
|
|
|
+
|
|
|
+static struct pppol2tp_session *next_session(struct pppol2tp_tunnel *tunnel, struct pppol2tp_session *curr)
|
|
|
+{
|
|
|
+ struct pppol2tp_session *session = NULL;
|
|
|
+ struct hlist_node *walk;
|
|
|
+ int found = 0;
|
|
|
+ int next = 0;
|
|
|
+ int i;
|
|
|
+
|
|
|
+ read_lock(&tunnel->hlist_lock);
|
|
|
+ for (i = 0; i < PPPOL2TP_HASH_SIZE; i++) {
|
|
|
+ hlist_for_each_entry(session, walk, &tunnel->session_hlist[i], hlist) {
|
|
|
+ if (curr == NULL) {
|
|
|
+ found = 1;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ if (session == curr) {
|
|
|
+ next = 1;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ if (next) {
|
|
|
+ found = 1;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+out:
|
|
|
+ read_unlock(&tunnel->hlist_lock);
|
|
|
+ if (!found)
|
|
|
+ session = NULL;
|
|
|
+
|
|
|
+ return session;
|
|
|
+}
|
|
|
+
|
|
|
+static struct pppol2tp_tunnel *next_tunnel(struct pppol2tp_tunnel *curr)
|
|
|
+{
|
|
|
+ struct pppol2tp_tunnel *tunnel = NULL;
|
|
|
+
|
|
|
+ read_lock(&pppol2tp_tunnel_list_lock);
|
|
|
+ if (list_is_last(&curr->list, &pppol2tp_tunnel_list)) {
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ tunnel = list_entry(curr->list.next, struct pppol2tp_tunnel, list);
|
|
|
+out:
|
|
|
+ read_unlock(&pppol2tp_tunnel_list_lock);
|
|
|
+
|
|
|
+ return tunnel;
|
|
|
+}
|
|
|
+
|
|
|
+static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
|
|
|
+{
|
|
|
+ struct pppol2tp_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) {
|
|
|
+ if (!list_empty(&pppol2tp_tunnel_list))
|
|
|
+ pd->tunnel = list_entry(pppol2tp_tunnel_list.next, struct pppol2tp_tunnel, list);
|
|
|
+ } else {
|
|
|
+ pd->session = next_session(pd->tunnel, pd->session);
|
|
|
+ if (pd->session == NULL) {
|
|
|
+ pd->tunnel = next_tunnel(pd->tunnel);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* 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 pppol2tp_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,
|
|
|
+ tunnel->stats.tx_packets, tunnel->stats.tx_bytes,
|
|
|
+ tunnel->stats.tx_errors,
|
|
|
+ tunnel->stats.rx_packets, tunnel->stats.rx_bytes,
|
|
|
+ tunnel->stats.rx_errors);
|
|
|
+}
|
|
|
+
|
|
|
+static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
|
|
|
+{
|
|
|
+ struct pppol2tp_session *session = v;
|
|
|
+
|
|
|
+ seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
|
|
|
+ "%04X/%04X %d %c\n",
|
|
|
+ session->name,
|
|
|
+ ntohl(session->tunnel_addr.addr.sin_addr.s_addr),
|
|
|
+ ntohs(session->tunnel_addr.addr.sin_port),
|
|
|
+ session->tunnel_addr.s_tunnel,
|
|
|
+ session->tunnel_addr.s_session,
|
|
|
+ session->tunnel_addr.d_tunnel,
|
|
|
+ session->tunnel_addr.d_session,
|
|
|
+ session->sock->sk_state,
|
|
|
+ (session == session->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,
|
|
|
+ session->stats.tx_packets,
|
|
|
+ session->stats.tx_bytes,
|
|
|
+ session->stats.tx_errors,
|
|
|
+ session->stats.rx_packets,
|
|
|
+ session->stats.rx_bytes,
|
|
|
+ session->stats.rx_errors);
|
|
|
+}
|
|
|
+
|
|
|
+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 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)
|
|
|
+{
|
|
|
+ struct seq_file *m;
|
|
|
+ struct pppol2tp_seq_data *pd;
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ ret = seq_open(file, &pppol2tp_seq_ops);
|
|
|
+ if (ret < 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ m = file->private_data;
|
|
|
+
|
|
|
+ /* Allocate and fill our proc_data for access later */
|
|
|
+ ret = -ENOMEM;
|
|
|
+ m->private = kzalloc(sizeof(struct pppol2tp_seq_data), GFP_KERNEL);
|
|
|
+ if (m->private == NULL)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ pd = m->private;
|
|
|
+ ret = 0;
|
|
|
+
|
|
|
+out:
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+/* Called when /proc file access completes.
|
|
|
+ */
|
|
|
+static int pppol2tp_proc_release(struct inode *inode, struct file *file)
|
|
|
+{
|
|
|
+ struct seq_file *m = (struct seq_file *)file->private_data;
|
|
|
+
|
|
|
+ kfree(m->private);
|
|
|
+ m->private = NULL;
|
|
|
+
|
|
|
+ return seq_release(inode, file);
|
|
|
+}
|
|
|
+
|
|
|
+static struct file_operations pppol2tp_proc_fops = {
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ .open = pppol2tp_proc_open,
|
|
|
+ .read = seq_read,
|
|
|
+ .llseek = seq_lseek,
|
|
|
+ .release = pppol2tp_proc_release,
|
|
|
+};
|
|
|
+
|
|
|
+static struct proc_dir_entry *pppol2tp_proc;
|
|
|
+
|
|
|
+#endif /* CONFIG_PROC_FS */
|
|
|
+
|
|
|
+/*****************************************************************************
|
|
|
+ * Init and cleanup
|
|
|
+ *****************************************************************************/
|
|
|
+
|
|
|
+static 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 struct pppox_proto pppol2tp_proto = {
|
|
|
+ .create = pppol2tp_create,
|
|
|
+ .ioctl = pppol2tp_ioctl
|
|
|
+};
|
|
|
+
|
|
|
+static int __init pppol2tp_init(void)
|
|
|
+{
|
|
|
+ int err;
|
|
|
+
|
|
|
+ err = proto_register(&pppol2tp_sk_proto, 0);
|
|
|
+ if (err)
|
|
|
+ goto out;
|
|
|
+ err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
|
|
|
+ if (err)
|
|
|
+ goto out_unregister_pppol2tp_proto;
|
|
|
+
|
|
|
+#ifdef CONFIG_PROC_FS
|
|
|
+ pppol2tp_proc = create_proc_entry("pppol2tp", 0, proc_net);
|
|
|
+ if (!pppol2tp_proc) {
|
|
|
+ err = -ENOMEM;
|
|
|
+ goto out_unregister_pppox_proto;
|
|
|
+ }
|
|
|
+ pppol2tp_proc->proc_fops = &pppol2tp_proc_fops;
|
|
|
+#endif /* CONFIG_PROC_FS */
|
|
|
+ printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
|
|
|
+ PPPOL2TP_DRV_VERSION);
|
|
|
+
|
|
|
+out:
|
|
|
+ return err;
|
|
|
+
|
|
|
+out_unregister_pppox_proto:
|
|
|
+ unregister_pppox_proto(PX_PROTO_OL2TP);
|
|
|
+out_unregister_pppol2tp_proto:
|
|
|
+ proto_unregister(&pppol2tp_sk_proto);
|
|
|
+ goto out;
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit pppol2tp_exit(void)
|
|
|
+{
|
|
|
+ unregister_pppox_proto(PX_PROTO_OL2TP);
|
|
|
+
|
|
|
+#ifdef CONFIG_PROC_FS
|
|
|
+ remove_proc_entry("pppol2tp", proc_net);
|
|
|
+#endif
|
|
|
+ proto_unregister(&pppol2tp_sk_proto);
|
|
|
+}
|
|
|
+
|
|
|
+module_init(pppol2tp_init);
|
|
|
+module_exit(pppol2tp_exit);
|
|
|
+
|
|
|
+MODULE_AUTHOR("Martijn van Oosterhout <kleptog@svana.org>,"
|
|
|
+ "James Chapman <jchapman@katalix.com>");
|
|
|
+MODULE_DESCRIPTION("PPP over L2TP over UDP");
|
|
|
+MODULE_LICENSE("GPL");
|
|
|
+MODULE_VERSION(PPPOL2TP_DRV_VERSION);
|
Linus Torvalds