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/*
* ppposeq - PPP over a SEQPACKET AF_PPPOX socket.
*
* Replaces the pty + ppp_async transport for userspace PPP terminators.
* A pty is a byte stream, so frame boundaries are lost in the tty flip
* buffer and have to be rebuilt with HDLC escape+FCS framing.
* Here the socket itself is the PPP endpoint and each datagram carries
* exactly one PPP frame, so no HDLC framing is needed on either side.
*
* fd = socket(AF_PPPOX, SOCK_SEQPACKET, PX_PROTO_OSEQ);
* connect(fd, &sa, sizeof(sa)); // registers the channel
* ioctl(fd, PPPIOCGCHAN, &idx);
* chan = open("/dev/ppp"); ioctl(chan, PPPIOCATTCHAN, &idx);
* // frames flow over fd with send()/recv()
*
* Only the protocol number is new; everything else uses the common
* AF_PPPOX and PPPIOC* interfaces.
*/
#ifndef __PPPOSEQ_H
#define __PPPOSEQ_H
#include <linux/if_pppox.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0)
typedef sa_family_t __kernel_sa_family_t;
#endif
#ifndef PX_PROTO_OSEQ
#define PX_PROTO_OSEQ 3
#endif
struct sockaddr_ppposeq {
__kernel_sa_family_t sa_family; /* AF_PPPOX */
unsigned int sa_protocol; /* PX_PROTO_OSEQ */
} __attribute__((packed));
#endif
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