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[L2TP]: Changes to existing ppp and socket kernel headers for L2TP

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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.

[ Modified to use aligned_u64 in statistics structure -DaveM ]

Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman
2007-06-27 15:43:43 -07:00
committed by David S. Miller
parent 342f0234c7
commit cf14a4d067
5 changed files with 101 additions and 2 deletions
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16
include/linux/if_pppox.h
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@@ -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));
/*********************************************************************
*