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Date: Wed, 27 Jun 2007 23:20:38 +0100
From: James Chapman <jchapman@...alix.com>
To: netdev@...r.kernel.org
Subject: [PATCH 2/5 2.6.22-rc6] L2TP: Changes to existing ppp and socket kernel headers for L2TP
Add struct sockaddr_pppol2tp to carry L2TP-specific address
information for the PPPoX (PPPoL2TP) socket. Unfortunately we can't
use the union inside struct sockaddr_pppox because the L2TP-specific
data is larger than the current size of the union and we must preserve
the size of struct sockaddr_pppox for binary compatibility.
Also add a PPPIOCGL2TPSTATS ioctl to allow userspace to obtain
L2TP counters and state from the kernel.
Add new if_pppol2tp.h header.
Signed-off-by: James Chapman <jchapman@...alix.com>
Index: linux-2.6.22-rc6/include/linux/if_ppp.h
===================================================================
--- linux-2.6.22-rc6.orig/include/linux/if_ppp.h
+++ linux-2.6.22-rc6/include/linux/if_ppp.h
@@ -110,6 +110,21 @@ struct ifpppcstatsreq {
struct ppp_comp_stats stats;
};
+/* For PPPIOCGL2TPSTATS */
+struct pppol2tp_ioc_stats {
+ __u16 tunnel_id; /* redundant */
+ __u16 session_id; /* if zero, get tunnel stats */
+ __u32 using_ipsec:1; /* valid only for session_id == 0 */
+ __u64 tx_packets;
+ __u64 tx_bytes;
+ __u64 tx_errors;
+ __u64 rx_packets;
+ __u64 rx_bytes;
+ __u64 rx_seq_discards;
+ __u64 rx_oos_packets;
+ __u64 rx_errors;
+};
+
#define ifr__name b.ifr_ifrn.ifrn_name
#define stats_ptr b.ifr_ifru.ifru_data
@@ -146,6 +161,7 @@ struct ifpppcstatsreq {
#define PPPIOCDISCONN _IO('t', 57) /* disconnect channel */
#define PPPIOCATTCHAN _IOW('t', 56, int) /* attach to ppp channel */
#define PPPIOCGCHAN _IOR('t', 55, int) /* get ppp channel number */
+#define PPPIOCGL2TPSTATS _IOR('t', 54, struct pppol2tp_ioc_stats)
#define SIOCGPPPSTATS (SIOCDEVPRIVATE + 0)
#define SIOCGPPPVER (SIOCDEVPRIVATE + 1) /* NEVER change this!! */
Index: linux-2.6.22-rc6/include/linux/if_pppox.h
===================================================================
--- linux-2.6.22-rc6.orig/include/linux/if_pppox.h
+++ linux-2.6.22-rc6/include/linux/if_pppox.h
@@ -27,6 +27,7 @@
#include <asm/semaphore.h>
#include <linux/ppp_channel.h>
#endif /* __KERNEL__ */
+#include <linux/if_pppol2tp.h>
/* For user-space programs to pick up these definitions
* which they wouldn't get otherwise without defining __KERNEL__
@@ -50,8 +51,9 @@ struct pppoe_addr{
* Protocols supported by AF_PPPOX
*/
#define PX_PROTO_OE 0 /* Currently just PPPoE */
-#define PX_MAX_PROTO 1
-
+#define PX_PROTO_OL2TP 1 /* Now L2TP also */
+#define PX_MAX_PROTO 2
+
struct sockaddr_pppox {
sa_family_t sa_family; /* address family, AF_PPPOX */
unsigned int sa_protocol; /* protocol identifier */
@@ -60,6 +62,16 @@ struct sockaddr_pppox {
}sa_addr;
}__attribute__ ((packed));
+/* The use of the above union isn't viable because the size of this
+ * struct must stay fixed over time -- applications use sizeof(struct
+ * sockaddr_pppox) to fill it. We use a protocol specific sockaddr
+ * type instead.
+ */
+struct sockaddr_pppol2tp {
+ sa_family_t sa_family; /* address family, AF_PPPOX */
+ unsigned int sa_protocol; /* protocol identifier */
+ struct pppol2tp_addr pppol2tp;
+}__attribute__ ((packed));
/*********************************************************************
*
Index: linux-2.6.22-rc6/include/linux/socket.h
===================================================================
--- linux-2.6.22-rc6.orig/include/linux/socket.h
+++ linux-2.6.22-rc6/include/linux/socket.h
@@ -287,6 +287,7 @@ struct ucred {
#define SOL_NETLINK 270
#define SOL_TIPC 271
#define SOL_RXRPC 272
+#define SOL_PPPOL2TP 273
/* IPX options */
#define IPX_TYPE 1
Index: linux-2.6.22-rc6/include/linux/if_pppol2tp.h
===================================================================
--- /dev/null
+++ linux-2.6.22-rc6/include/linux/if_pppol2tp.h
@@ -0,0 +1,69 @@
+/***************************************************************************
+ * Linux PPP over L2TP (PPPoL2TP) Socket Implementation (RFC 2661)
+ *
+ * This file supplies definitions required by the PPP over L2TP driver
+ * (pppol2tp.c). All version information wrt this file is located in pppol2tp.c
+ *
+ * License:
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#ifndef __LINUX_IF_PPPOL2TP_H
+#define __LINUX_IF_PPPOL2TP_H
+
+#include <asm/types.h>
+
+#ifdef __KERNEL__
+#include <linux/in.h>
+#endif
+
+/* Structure used to connect() the socket to a particular tunnel UDP
+ * socket.
+ */
+struct pppol2tp_addr
+{
+ pid_t pid; /* pid that owns the fd.
+ * 0 => current */
+ int fd; /* FD of UDP socket to use */
+
+ struct sockaddr_in addr; /* IP address and port to send to */
+
+ __be16 s_tunnel, s_session; /* For matching incoming packets */
+ __be16 d_tunnel, d_session; /* For sending outgoing packets */
+};
+
+/* Socket options:
+ * DEBUG - bitmask of debug message categories
+ * SENDSEQ - 0 => don't send packets with sequence numbers
+ * 1 => send packets with sequence numbers
+ * RECVSEQ - 0 => receive packet sequence numbers are optional
+ * 1 => drop receive packets without sequence numbers
+ * LNSMODE - 0 => act as LAC.
+ * 1 => act as LNS.
+ * REORDERTO - reorder timeout (in millisecs). If 0, don't try to reorder.
+ */
+enum {
+ PPPOL2TP_SO_DEBUG = 1,
+ PPPOL2TP_SO_RECVSEQ = 2,
+ PPPOL2TP_SO_SENDSEQ = 3,
+ PPPOL2TP_SO_LNSMODE = 4,
+ PPPOL2TP_SO_REORDERTO = 5,
+};
+
+/* Debug message categories for the DEBUG socket option */
+enum {
+ PPPOL2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if
+ * compiled in) */
+ PPPOL2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel
+ * interface */
+ PPPOL2TP_MSG_SEQ = (1 << 2), /* sequence numbers */
+ PPPOL2TP_MSG_DATA = (1 << 3), /* data packets */
+};
+
+
+
+#endif
Index: linux-2.6.22-rc6/include/linux/Kbuild
===================================================================
--- linux-2.6.22-rc6.orig/include/linux/Kbuild
+++ linux-2.6.22-rc6/include/linux/Kbuild
@@ -225,6 +225,7 @@ unifdef-y += if_fddi.h
unifdef-y += if_frad.h
unifdef-y += if_ltalk.h
unifdef-y += if_link.h
+unifdef-y += if_pppol2tp.h
unifdef-y += if_pppox.h
unifdef-y += if_shaper.h
unifdef-y += if_tr.h
-
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