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![Hannes Eder](/assets/img/avatar_default.png)
Fix this sparse warnings: drivers/net/ppp_generic.c:919:43: warning: incorrect type in argument 1 (different signedness) drivers/net/pppoe.c:1195:43: warning: incorrect type in argument 1 (different signedness) drivers/net/pppol2tp.c:2666:43: warning: incorrect type in argument 1 (different signedness) Signed-off-by: Hannes Eder <hannes@hanneseder.net> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2695 lines
70 KiB
C
2695 lines
70 KiB
C
/*****************************************************************************
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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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/* 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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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <asm/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/kthread.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/jiffies.h>
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#include <linux/netdevice.h>
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#include <linux/net.h>
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#include <linux/inetdevice.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/if_pppox.h>
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#include <linux/if_pppol2tp.h>
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#include <net/sock.h>
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#include <linux/ppp_channel.h>
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#include <linux/ppp_defs.h>
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#include <linux/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 <linux/nsproxy.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/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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#include <asm/byteorder.h>
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#include <asm/atomic.h>
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#define PPPOL2TP_DRV_VERSION "V1.0"
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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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#define L2TP_HDR_VER_MASK 0x000F
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#define L2TP_HDR_VER 0x0002
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/* Space for UDP, L2TP and PPP headers */
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#define PPPOL2TP_HEADER_OVERHEAD 40
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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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#define PPPOL2TP_HASH_BITS 4
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#define PPPOL2TP_HASH_SIZE (1 << PPPOL2TP_HASH_BITS)
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/* Default trace flags */
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#define PPPOL2TP_DEFAULT_DEBUG_FLAGS 0
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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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/* 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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struct pppol2tp_tunnel;
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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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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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struct pppol2tp_addr tunnel_addr; /* Description of tunnel */
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struct pppol2tp_tunnel *tunnel; /* back pointer to tunnel
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* context */
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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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/* 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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void (*old_sk_destruct)(struct sock *);
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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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struct net *pppol2tp_net; /* the net we belong to */
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atomic_t ref_count;
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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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#define PPPOL2TP_SKB_CB(skb) ((struct pppol2tp_skb_cb *) &skb->cb[sizeof(struct inet_skb_parm)])
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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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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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/* per-net private data for this module */
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static int pppol2tp_net_id;
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struct pppol2tp_net {
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struct list_head pppol2tp_tunnel_list;
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rwlock_t pppol2tp_tunnel_list_lock;
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};
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static inline struct pppol2tp_net *pppol2tp_pernet(struct net *net)
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{
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BUG_ON(!net);
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return net_generic(net, pppol2tp_net_id);
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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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if (sk == NULL)
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return NULL;
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sock_hold(sk);
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session = (struct pppol2tp_session *)(sk->sk_user_data);
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if (session == NULL) {
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sock_put(sk);
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goto out;
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}
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BUG_ON(session->magic != L2TP_SESSION_MAGIC);
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out:
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return session;
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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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if (sk == NULL)
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return NULL;
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sock_hold(sk);
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tunnel = (struct pppol2tp_tunnel *)(sk->sk_user_data);
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if (tunnel == NULL) {
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sock_put(sk);
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goto out;
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}
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BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
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out:
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return tunnel;
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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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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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/* 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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/* 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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read_lock_bh(&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_bh(&tunnel->hlist_lock);
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return session;
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}
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}
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read_unlock_bh(&tunnel->hlist_lock);
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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(struct net *net, u16 tunnel_id)
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{
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struct pppol2tp_tunnel *tunnel;
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struct pppol2tp_net *pn = pppol2tp_pernet(net);
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read_lock_bh(&pn->pppol2tp_tunnel_list_lock);
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list_for_each_entry(tunnel, &pn->pppol2tp_tunnel_list, list) {
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if (tunnel->stats.tunnel_id == tunnel_id) {
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read_unlock_bh(&pn->pppol2tp_tunnel_list_lock);
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return tunnel;
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}
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}
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read_unlock_bh(&pn->pppol2tp_tunnel_list_lock);
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return NULL;
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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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struct sk_buff *tmp;
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u16 ns = PPPOL2TP_SKB_CB(skb)->ns;
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spin_lock_bh(&session->reorder_q.lock);
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skb_queue_walk_safe(&session->reorder_q, skbp, tmp) {
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if (PPPOL2TP_SKB_CB(skbp)->ns > ns) {
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__skb_queue_before(&session->reorder_q, skbp, skb);
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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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__skb_queue_tail(&session->reorder_q, skb);
|
|
|
|
out:
|
|
spin_unlock_bh(&session->reorder_q.lock);
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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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{
|
|
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;
|
|
|
|
/* We're about to requeue the skb, so return resources
|
|
* to its current owner (a socket receive buffer).
|
|
*/
|
|
skb_orphan(skb);
|
|
|
|
tunnel->stats.rx_packets++;
|
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tunnel->stats.rx_bytes += length;
|
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session->stats.rx_packets++;
|
|
session->stats.rx_bytes += length;
|
|
|
|
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_bh(&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);
|
|
sock_put(session->sock);
|
|
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;
|
|
}
|
|
}
|
|
__skb_unlink(skb, &session->reorder_q);
|
|
|
|
/* Process the skb. We release the queue lock while we
|
|
* do so to let other contexts process the queue.
|
|
*/
|
|
spin_unlock_bh(&session->reorder_q.lock);
|
|
pppol2tp_recv_dequeue_skb(session, skb);
|
|
spin_lock_bh(&session->reorder_q.lock);
|
|
}
|
|
|
|
out:
|
|
spin_unlock_bh(&session->reorder_q.lock);
|
|
}
|
|
|
|
static inline int pppol2tp_verify_udp_checksum(struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct udphdr *uh = udp_hdr(skb);
|
|
u16 ulen = ntohs(uh->len);
|
|
struct inet_sock *inet;
|
|
__wsum psum;
|
|
|
|
if (sk->sk_no_check || skb_csum_unnecessary(skb) || !uh->check)
|
|
return 0;
|
|
|
|
inet = inet_sk(sk);
|
|
psum = csum_tcpudp_nofold(inet->saddr, inet->daddr, ulen,
|
|
IPPROTO_UDP, 0);
|
|
|
|
if ((skb->ip_summed == CHECKSUM_COMPLETE) &&
|
|
!csum_fold(csum_add(psum, skb->csum)))
|
|
return 0;
|
|
|
|
skb->csum = psum;
|
|
|
|
return __skb_checksum_complete(skb);
|
|
}
|
|
|
|
/* 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, *optr;
|
|
u16 hdrflags;
|
|
u16 tunnel_id, session_id;
|
|
int length;
|
|
int offset;
|
|
|
|
tunnel = pppol2tp_sock_to_tunnel(sock);
|
|
if (tunnel == NULL)
|
|
goto no_tunnel;
|
|
|
|
if (tunnel->sock && pppol2tp_verify_udp_checksum(tunnel->sock, skb))
|
|
goto discard_bad_csum;
|
|
|
|
/* UDP always verifies the packet length. */
|
|
__skb_pull(skb, sizeof(struct udphdr));
|
|
|
|
/* Short packet? */
|
|
if (!pskb_may_pull(skb, 12)) {
|
|
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 */
|
|
optr = ptr = skb->data;
|
|
|
|
/* Get L2TP header flags */
|
|
hdrflags = ntohs(*(__be16*)ptr);
|
|
|
|
/* Trace packet contents, if enabled */
|
|
if (tunnel->debug & PPPOL2TP_MSG_DATA) {
|
|
length = min(16u, skb->len);
|
|
if (!pskb_may_pull(skb, length))
|
|
goto error;
|
|
|
|
printk(KERN_DEBUG "%s: recv: ", tunnel->name);
|
|
|
|
offset = 0;
|
|
do {
|
|
printk(" %02X", ptr[offset]);
|
|
} while (++offset < length);
|
|
|
|
printk("\n");
|
|
}
|
|
|
|
/* Get length of L2TP packet */
|
|
length = skb->len;
|
|
|
|
/* If type is control packet, it is handled by userspace. */
|
|
if (hdrflags & L2TP_HDRFLAG_T) {
|
|
PRINTK(tunnel->debug, 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++;
|
|
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++;
|
|
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) {
|
|
offset = ntohs(*(__be16 *)ptr);
|
|
ptr += 2 + offset;
|
|
}
|
|
|
|
offset = ptr - optr;
|
|
if (!pskb_may_pull(skb, offset))
|
|
goto discard;
|
|
|
|
__skb_pull(skb, offset);
|
|
|
|
/* Skip PPP header, if present. In testing, Microsoft L2TP clients
|
|
* don't send the PPP header (PPP header compression enabled), but
|
|
* other clients can include the header. So we cope with both cases
|
|
* here. The PPP header is always FF03 when using L2TP.
|
|
*
|
|
* Note that skb->data[] isn't dereferenced from a u16 ptr here since
|
|
* the field may be unaligned.
|
|
*/
|
|
if (!pskb_may_pull(skb, 2))
|
|
goto discard;
|
|
|
|
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++;
|
|
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:
|
|
session->stats.rx_errors++;
|
|
kfree_skb(skb);
|
|
sock_put(session->sock);
|
|
sock_put(sock);
|
|
|
|
return 0;
|
|
|
|
discard_bad_csum:
|
|
LIMIT_NETDEBUG("%s: UDP: bad checksum\n", tunnel->name);
|
|
UDP_INC_STATS_USER(&init_net, UDP_MIB_INERRORS, 0);
|
|
tunnel->stats.rx_errors++;
|
|
kfree_skb(skb);
|
|
|
|
return 0;
|
|
|
|
error:
|
|
/* Put UDP header back */
|
|
__skb_push(skb, sizeof(struct udphdr));
|
|
sock_put(sock);
|
|
|
|
no_tunnel:
|
|
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_put;
|
|
|
|
sock_put(sk);
|
|
return 0;
|
|
|
|
pass_up_put:
|
|
sock_put(sk);
|
|
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)
|
|
goto end;
|
|
|
|
if (len > skb->len)
|
|
len = skb->len;
|
|
else if (len < skb->len)
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
|
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
|
|
if (likely(err == 0))
|
|
err = len;
|
|
|
|
kfree_skb(skb);
|
|
end:
|
|
return err;
|
|
}
|
|
|
|
/************************************************************************
|
|
* 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;
|
|
struct sk_buff *skb;
|
|
int error;
|
|
int hdr_len;
|
|
struct pppol2tp_session *session;
|
|
struct pppol2tp_tunnel *tunnel;
|
|
struct udphdr *uh;
|
|
unsigned int len;
|
|
struct sock *sk_tun;
|
|
u16 udp_len;
|
|
|
|
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;
|
|
|
|
sk_tun = session->tunnel_sock;
|
|
tunnel = pppol2tp_sock_to_tunnel(sk_tun);
|
|
if (tunnel == NULL)
|
|
goto error_put_sess;
|
|
|
|
/* 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_put_sess_tun;
|
|
|
|
/* Reserve space for headers. */
|
|
skb_reserve(skb, NET_SKB_PAD);
|
|
skb_reset_network_header(skb);
|
|
skb_reserve(skb, sizeof(struct iphdr));
|
|
skb_reset_transport_header(skb);
|
|
|
|
/* Build UDP header */
|
|
inet = inet_sk(sk_tun);
|
|
udp_len = hdr_len + sizeof(ppph) + total_len;
|
|
uh = (struct udphdr *) skb->data;
|
|
uh->source = inet->sport;
|
|
uh->dest = inet->dport;
|
|
uh->len = htons(udp_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_put_sess_tun;
|
|
}
|
|
skb_put(skb, total_len);
|
|
|
|
/* Calculate UDP checksum if configured to do so */
|
|
if (sk_tun->sk_no_check == UDP_CSUM_NOXMIT)
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
else if (!(skb->dst->dev->features & NETIF_F_V4_CSUM)) {
|
|
skb->ip_summed = CHECKSUM_COMPLETE;
|
|
csum = skb_checksum(skb, 0, udp_len, 0);
|
|
uh->check = csum_tcpudp_magic(inet->saddr, inet->daddr,
|
|
udp_len, IPPROTO_UDP, csum);
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
} else {
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
skb->csum_start = skb_transport_header(skb) - skb->head;
|
|
skb->csum_offset = offsetof(struct udphdr, check);
|
|
uh->check = ~csum_tcpudp_magic(inet->saddr, inet->daddr,
|
|
udp_len, IPPROTO_UDP, 0);
|
|
}
|
|
|
|
/* 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 */
|
|
len = skb->len;
|
|
error = ip_queue_xmit(skb, 1);
|
|
|
|
/* Update stats */
|
|
if (error >= 0) {
|
|
tunnel->stats.tx_packets++;
|
|
tunnel->stats.tx_bytes += len;
|
|
session->stats.tx_packets++;
|
|
session->stats.tx_bytes += len;
|
|
} else {
|
|
tunnel->stats.tx_errors++;
|
|
session->stats.tx_errors++;
|
|
}
|
|
|
|
return error;
|
|
|
|
error_put_sess_tun:
|
|
sock_put(session->tunnel_sock);
|
|
error_put_sess:
|
|
sock_put(sk);
|
|
error:
|
|
return error;
|
|
}
|
|
|
|
/* Automatically called when the skb is freed.
|
|
*/
|
|
static void pppol2tp_sock_wfree(struct sk_buff *skb)
|
|
{
|
|
sock_put(skb->sk);
|
|
}
|
|
|
|
/* For data skbs that we transmit, we associate with the tunnel socket
|
|
* but don't do accounting.
|
|
*/
|
|
static inline void pppol2tp_skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
sock_hold(sk);
|
|
skb->sk = sk;
|
|
skb->destructor = pppol2tp_sock_wfree;
|
|
}
|
|
|
|
/* 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;
|
|
u16 udp_len;
|
|
struct pppol2tp_session *session;
|
|
struct pppol2tp_tunnel *tunnel;
|
|
int rc;
|
|
int headroom;
|
|
int data_len = skb->len;
|
|
struct inet_sock *inet;
|
|
__wsum csum;
|
|
struct udphdr *uh;
|
|
unsigned int len;
|
|
int old_headroom;
|
|
int new_headroom;
|
|
|
|
if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
|
|
goto abort;
|
|
|
|
/* Get session and tunnel contexts from the socket */
|
|
session = pppol2tp_sock_to_session(sk);
|
|
if (session == NULL)
|
|
goto abort;
|
|
|
|
sk_tun = session->tunnel_sock;
|
|
if (sk_tun == NULL)
|
|
goto abort_put_sess;
|
|
tunnel = pppol2tp_sock_to_tunnel(sk_tun);
|
|
if (tunnel == NULL)
|
|
goto abort_put_sess;
|
|
|
|
/* 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. Adjust truesize.
|
|
*/
|
|
headroom = NET_SKB_PAD + sizeof(struct iphdr) +
|
|
sizeof(struct udphdr) + hdr_len + sizeof(ppph);
|
|
old_headroom = skb_headroom(skb);
|
|
if (skb_cow_head(skb, headroom))
|
|
goto abort_put_sess_tun;
|
|
|
|
new_headroom = skb_headroom(skb);
|
|
skb_orphan(skb);
|
|
skb->truesize += new_headroom - old_headroom;
|
|
|
|
/* Setup PPP header */
|
|
__skb_push(skb, sizeof(ppph));
|
|
skb->data[0] = ppph[0];
|
|
skb->data[1] = ppph[1];
|
|
|
|
/* Setup L2TP header */
|
|
pppol2tp_build_l2tp_header(session, __skb_push(skb, hdr_len));
|
|
|
|
udp_len = sizeof(struct udphdr) + hdr_len + sizeof(ppph) + data_len;
|
|
|
|
/* Setup UDP header */
|
|
inet = inet_sk(sk_tun);
|
|
__skb_push(skb, sizeof(*uh));
|
|
skb_reset_transport_header(skb);
|
|
uh = udp_hdr(skb);
|
|
uh->source = inet->sport;
|
|
uh->dest = inet->dport;
|
|
uh->len = htons(udp_len);
|
|
uh->check = 0;
|
|
|
|
/* 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 = skb->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");
|
|
}
|
|
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
|
IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
|
|
IPSKB_REROUTED);
|
|
nf_reset(skb);
|
|
|
|
/* Get routing info from the tunnel socket */
|
|
dst_release(skb->dst);
|
|
skb->dst = dst_clone(__sk_dst_get(sk_tun));
|
|
pppol2tp_skb_set_owner_w(skb, sk_tun);
|
|
|
|
/* Calculate UDP checksum if configured to do so */
|
|
if (sk_tun->sk_no_check == UDP_CSUM_NOXMIT)
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
else if (!(skb->dst->dev->features & NETIF_F_V4_CSUM)) {
|
|
skb->ip_summed = CHECKSUM_COMPLETE;
|
|
csum = skb_checksum(skb, 0, udp_len, 0);
|
|
uh->check = csum_tcpudp_magic(inet->saddr, inet->daddr,
|
|
udp_len, IPPROTO_UDP, csum);
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
} else {
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
skb->csum_start = skb_transport_header(skb) - skb->head;
|
|
skb->csum_offset = offsetof(struct udphdr, check);
|
|
uh->check = ~csum_tcpudp_magic(inet->saddr, inet->daddr,
|
|
udp_len, IPPROTO_UDP, 0);
|
|
}
|
|
|
|
/* Queue the packet to IP for output */
|
|
len = skb->len;
|
|
rc = ip_queue_xmit(skb, 1);
|
|
|
|
/* Update stats */
|
|
if (rc >= 0) {
|
|
tunnel->stats.tx_packets++;
|
|
tunnel->stats.tx_bytes += len;
|
|
session->stats.tx_packets++;
|
|
session->stats.tx_bytes += len;
|
|
} else {
|
|
tunnel->stats.tx_errors++;
|
|
session->stats.tx_errors++;
|
|
}
|
|
|
|
sock_put(sk_tun);
|
|
sock_put(sk);
|
|
return 1;
|
|
|
|
abort_put_sess_tun:
|
|
sock_put(sk_tun);
|
|
abort_put_sess:
|
|
sock_put(sk);
|
|
abort:
|
|
/* Free the original skb */
|
|
kfree_skb(skb);
|
|
return 1;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Session (and tunnel control) socket create/destroy.
|
|
*****************************************************************************/
|
|
|
|
/* 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_bh(&tunnel->hlist_lock);
|
|
for (hash = 0; hash < PPPOL2TP_HASH_SIZE; hash++) {
|
|
again:
|
|
hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
|
|
struct sk_buff *skb;
|
|
|
|
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_bh(&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);
|
|
while ((skb = skb_dequeue(&session->reorder_q))) {
|
|
kfree_skb(skb);
|
|
sock_put(sk);
|
|
}
|
|
|
|
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_bh(&tunnel->hlist_lock);
|
|
goto again;
|
|
}
|
|
}
|
|
write_unlock_bh(&tunnel->hlist_lock);
|
|
}
|
|
|
|
/* Really kill the tunnel.
|
|
* Come here only when all sessions have been cleared from the tunnel.
|
|
*/
|
|
static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel)
|
|
{
|
|
struct pppol2tp_net *pn = pppol2tp_pernet(tunnel->pppol2tp_net);
|
|
|
|
/* Remove from socket list */
|
|
write_lock_bh(&pn->pppol2tp_tunnel_list_lock);
|
|
list_del_init(&tunnel->list);
|
|
write_unlock_bh(&pn->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 = sk->sk_user_data;
|
|
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 = sk->sk_user_data;
|
|
if (session == NULL)
|
|
goto out;
|
|
|
|
BUG_ON(session->magic != L2TP_SESSION_MAGIC);
|
|
|
|
/* 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_bh(&tunnel->hlist_lock);
|
|
hlist_del_init(&session->hlist);
|
|
write_unlock_bh(&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;
|
|
struct pppol2tp_session *session;
|
|
int error;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
error = -EBADF;
|
|
lock_sock(sk);
|
|
if (sock_flag(sk, SOCK_DEAD) != 0)
|
|
goto error;
|
|
|
|
pppox_unbind_sock(sk);
|
|
|
|
/* Signal the death of the socket. */
|
|
sk->sk_state = PPPOX_DEAD;
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
|
|
session = pppol2tp_sock_to_session(sk);
|
|
|
|
/* Purge any queued data */
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
skb_queue_purge(&sk->sk_write_queue);
|
|
if (session != NULL) {
|
|
struct sk_buff *skb;
|
|
while ((skb = skb_dequeue(&session->reorder_q))) {
|
|
kfree_skb(skb);
|
|
sock_put(sk);
|
|
}
|
|
sock_put(sk);
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
/* This will delete the session context via
|
|
* pppol2tp_session_destruct() if the socket's refcnt drops to
|
|
* zero.
|
|
*/
|
|
sock_put(sk);
|
|
|
|
return 0;
|
|
|
|
error:
|
|
release_sock(sk);
|
|
return error;
|
|
}
|
|
|
|
/* Internal function to prepare a tunnel (UDP) socket to have PPPoX
|
|
* sockets attached to it.
|
|
*/
|
|
static struct sock *pppol2tp_prepare_tunnel_socket(struct net *net,
|
|
int fd, u16 tunnel_id, int *error)
|
|
{
|
|
int err;
|
|
struct socket *sock = NULL;
|
|
struct sock *sk;
|
|
struct pppol2tp_tunnel *tunnel;
|
|
struct pppol2tp_net *pn;
|
|
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;
|
|
}
|
|
|
|
sk = sock->sk;
|
|
|
|
/* Quick sanity checks */
|
|
err = -EPROTONOSUPPORT;
|
|
if (sk->sk_protocol != IPPROTO_UDP) {
|
|
PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR,
|
|
"tunl %hu: fd %d wrong protocol, got %d, expected %d\n",
|
|
tunnel_id, fd, sk->sk_protocol, IPPROTO_UDP);
|
|
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;
|
|
|
|
/* 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);
|
|
|
|
/* The net we belong to */
|
|
tunnel->pppol2tp_net = net;
|
|
pn = pppol2tp_pernet(net);
|
|
|
|
/* Add tunnel to our list */
|
|
INIT_LIST_HEAD(&tunnel->list);
|
|
write_lock_bh(&pn->pppol2tp_tunnel_list_lock);
|
|
list_add(&tunnel->list, &pn->pppol2tp_tunnel_list);
|
|
write_unlock_bh(&pn->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 net *net, struct socket *sock)
|
|
{
|
|
int error = -ENOMEM;
|
|
struct sock *sk;
|
|
|
|
sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
|
|
if (!sk)
|
|
goto out;
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
sock->ops = &pppol2tp_ops;
|
|
|
|
sk->sk_backlog_rcv = pppol2tp_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(sock_net(sk),
|
|
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(sock_net(sk), 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_net_channel(sock_net(sk), &po->chan);
|
|
if (error)
|
|
goto end_put_tun;
|
|
|
|
/* 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_bh(&tunnel->hlist_lock);
|
|
hlist_add_head(&session->hlist,
|
|
pppol2tp_session_id_hash(tunnel,
|
|
session->tunnel_addr.s_session));
|
|
write_unlock_bh(&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_put_tun:
|
|
sock_put(tunnel_sock);
|
|
end:
|
|
release_sock(sk);
|
|
|
|
if (error != 0) {
|
|
if (session)
|
|
PRINTK(session->debug,
|
|
PPPOL2TP_MSG_CONTROL, KERN_WARNING,
|
|
"%s: connect failed: %d\n",
|
|
session->name, error);
|
|
else
|
|
PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_WARNING,
|
|
"connect failed: %d\n", 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;
|
|
sock_put(sock->sk);
|
|
|
|
end:
|
|
return error;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* ioctl() handlers.
|
|
*
|
|
* The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
|
|
* sockets. However, in order to control kernel tunnel features, we allow
|
|
* userspace to create a special "tunnel" PPPoX socket which is used for
|
|
* control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
|
|
* the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
|
|
* calls.
|
|
****************************************************************************/
|
|
|
|
/* 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_put_sess;
|
|
|
|
err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
|
|
sock_put(session->tunnel_sock);
|
|
goto end_put_sess;
|
|
}
|
|
|
|
err = pppol2tp_session_ioctl(session, cmd, arg);
|
|
|
|
end_put_sess:
|
|
sock_put(sk);
|
|
end:
|
|
return err;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* setsockopt() / getsockopt() support.
|
|
*
|
|
* The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
|
|
* sockets. In order to control kernel tunnel features, we allow userspace to
|
|
* create a special "tunnel" PPPoX socket which is used for control only.
|
|
* Tunnel PPPoX sockets have session_id == 0 and simply allow the user
|
|
* application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
|
|
*****************************************************************************/
|
|
|
|
/* Tunnel setsockopt() helper.
|
|
*/
|
|
static int pppol2tp_tunnel_setsockopt(struct sock *sk,
|
|
struct 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_put_sess;
|
|
|
|
err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
|
|
sock_put(session->tunnel_sock);
|
|
} else
|
|
err = pppol2tp_session_setsockopt(sk, session, optname, val);
|
|
|
|
err = 0;
|
|
|
|
end_put_sess:
|
|
sock_put(sk);
|
|
end:
|
|
return err;
|
|
}
|
|
|
|
/* Tunnel getsockopt helper. Called with sock locked.
|
|
*/
|
|
static int pppol2tp_tunnel_getsockopt(struct sock *sk,
|
|
struct pppol2tp_tunnel *tunnel,
|
|
int optname, int *val)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (optname) {
|
|
case PPPOL2TP_SO_DEBUG:
|
|
*val = tunnel->debug;
|
|
PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
"%s: get debug=%x\n", tunnel->name, tunnel->debug);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Session getsockopt helper. Called with sock locked.
|
|
*/
|
|
static int pppol2tp_session_getsockopt(struct sock *sk,
|
|
struct pppol2tp_session *session,
|
|
int optname, int *val)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (optname) {
|
|
case PPPOL2TP_SO_RECVSEQ:
|
|
*val = session->recv_seq;
|
|
PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
"%s: get recv_seq=%d\n", session->name, *val);
|
|
break;
|
|
|
|
case PPPOL2TP_SO_SENDSEQ:
|
|
*val = session->send_seq;
|
|
PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
"%s: get send_seq=%d\n", session->name, *val);
|
|
break;
|
|
|
|
case PPPOL2TP_SO_LNSMODE:
|
|
*val = session->lns_mode;
|
|
PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
"%s: get lns_mode=%d\n", session->name, *val);
|
|
break;
|
|
|
|
case PPPOL2TP_SO_DEBUG:
|
|
*val = session->debug;
|
|
PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
"%s: get debug=%d\n", session->name, *val);
|
|
break;
|
|
|
|
case PPPOL2TP_SO_REORDERTO:
|
|
*val = (int) jiffies_to_msecs(session->reorder_timeout);
|
|
PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
|
|
"%s: get reorder_timeout=%d\n", session->name, *val);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Main getsockopt() entry point.
|
|
* Does API checks, then calls either the tunnel or session getsockopt
|
|
* handler, according to whether the PPPoX socket is a for a regular session
|
|
* or the special tunnel type.
|
|
*/
|
|
static int pppol2tp_getsockopt(struct socket *sock, int level,
|
|
int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct 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_put_sess;
|
|
|
|
err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
|
|
sock_put(session->tunnel_sock);
|
|
} else
|
|
err = pppol2tp_session_getsockopt(sk, session, optname, &val);
|
|
|
|
err = -EFAULT;
|
|
if (put_user(len, (int __user *) optlen))
|
|
goto end_put_sess;
|
|
|
|
if (copy_to_user((void __user *) optval, &val, len))
|
|
goto end_put_sess;
|
|
|
|
err = 0;
|
|
|
|
end_put_sess:
|
|
sock_put(sk);
|
|
end:
|
|
return err;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* /proc filesystem for debug
|
|
*****************************************************************************/
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
#include <linux/seq_file.h>
|
|
|
|
struct pppol2tp_seq_data {
|
|
struct seq_net_private p;
|
|
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_bh(&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_bh(&tunnel->hlist_lock);
|
|
if (!found)
|
|
session = NULL;
|
|
|
|
return session;
|
|
}
|
|
|
|
static struct pppol2tp_tunnel *next_tunnel(struct pppol2tp_net *pn,
|
|
struct pppol2tp_tunnel *curr)
|
|
{
|
|
struct pppol2tp_tunnel *tunnel = NULL;
|
|
|
|
read_lock_bh(&pn->pppol2tp_tunnel_list_lock);
|
|
if (list_is_last(&curr->list, &pn->pppol2tp_tunnel_list)) {
|
|
goto out;
|
|
}
|
|
tunnel = list_entry(curr->list.next, struct pppol2tp_tunnel, list);
|
|
out:
|
|
read_unlock_bh(&pn->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;
|
|
struct pppol2tp_net *pn;
|
|
loff_t pos = *offs;
|
|
|
|
if (!pos)
|
|
goto out;
|
|
|
|
BUG_ON(m->private == NULL);
|
|
pd = m->private;
|
|
pn = pppol2tp_pernet(seq_file_net(m));
|
|
|
|
if (pd->tunnel == NULL) {
|
|
if (!list_empty(&pn->pppol2tp_tunnel_list))
|
|
pd->tunnel = list_entry(pn->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(pn, 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,
|
|
(unsigned long long)tunnel->stats.tx_packets,
|
|
(unsigned long long)tunnel->stats.tx_bytes,
|
|
(unsigned long long)tunnel->stats.tx_errors,
|
|
(unsigned long long)tunnel->stats.rx_packets,
|
|
(unsigned long long)tunnel->stats.rx_bytes,
|
|
(unsigned long long)tunnel->stats.rx_errors);
|
|
}
|
|
|
|
static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
|
|
{
|
|
struct 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,
|
|
(unsigned long long)session->stats.tx_packets,
|
|
(unsigned long long)session->stats.tx_bytes,
|
|
(unsigned long long)session->stats.tx_errors,
|
|
(unsigned long long)session->stats.rx_packets,
|
|
(unsigned long long)session->stats.rx_bytes,
|
|
(unsigned long long)session->stats.rx_errors);
|
|
}
|
|
|
|
static int pppol2tp_seq_show(struct seq_file *m, void *v)
|
|
{
|
|
struct pppol2tp_seq_data *pd = v;
|
|
|
|
/* display header on line 1 */
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
|
|
seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
|
|
seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
|
|
seq_puts(m, " SESSION name, addr/port src-tid/sid "
|
|
"dest-tid/sid state user-data-ok\n");
|
|
seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
|
|
seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
|
|
goto out;
|
|
}
|
|
|
|
/* Show the tunnel or session context.
|
|
*/
|
|
if (pd->session == NULL)
|
|
pppol2tp_seq_tunnel_show(m, pd->tunnel);
|
|
else
|
|
pppol2tp_seq_session_show(m, pd->session);
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations pppol2tp_seq_ops = {
|
|
.start = pppol2tp_seq_start,
|
|
.next = pppol2tp_seq_next,
|
|
.stop = pppol2tp_seq_stop,
|
|
.show = pppol2tp_seq_show,
|
|
};
|
|
|
|
/* Called when our /proc file is opened. We allocate data for use when
|
|
* iterating our tunnel / session contexts and store it in the private
|
|
* data of the seq_file.
|
|
*/
|
|
static int pppol2tp_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &pppol2tp_seq_ops,
|
|
sizeof(struct pppol2tp_seq_data));
|
|
}
|
|
|
|
static const struct file_operations pppol2tp_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = pppol2tp_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/*****************************************************************************
|
|
* 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 __net_init int pppol2tp_init_net(struct net *net)
|
|
{
|
|
struct pppol2tp_net *pn;
|
|
struct proc_dir_entry *pde;
|
|
int err;
|
|
|
|
pn = kzalloc(sizeof(*pn), GFP_KERNEL);
|
|
if (!pn)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&pn->pppol2tp_tunnel_list);
|
|
rwlock_init(&pn->pppol2tp_tunnel_list_lock);
|
|
|
|
err = net_assign_generic(net, pppol2tp_net_id, pn);
|
|
if (err)
|
|
goto out;
|
|
|
|
pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
|
|
#ifdef CONFIG_PROC_FS
|
|
if (!pde) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
out:
|
|
kfree(pn);
|
|
return err;
|
|
}
|
|
|
|
static __net_exit void pppol2tp_exit_net(struct net *net)
|
|
{
|
|
struct pppoe_net *pn;
|
|
|
|
proc_net_remove(net, "pppol2tp");
|
|
pn = net_generic(net, pppol2tp_net_id);
|
|
/*
|
|
* if someone has cached our net then
|
|
* further net_generic call will return NULL
|
|
*/
|
|
net_assign_generic(net, pppol2tp_net_id, NULL);
|
|
kfree(pn);
|
|
}
|
|
|
|
static struct pernet_operations pppol2tp_net_ops = {
|
|
.init = pppol2tp_init_net,
|
|
.exit = pppol2tp_exit_net,
|
|
};
|
|
|
|
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;
|
|
|
|
err = register_pernet_gen_device(&pppol2tp_net_id, &pppol2tp_net_ops);
|
|
if (err)
|
|
goto out_unregister_pppox_proto;
|
|
|
|
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);
|
|
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);
|