Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/include/linux/ppp_channel.h b/include/linux/ppp_channel.h
new file mode 100644
index 000000000..45e6e427c
--- /dev/null
+++ b/include/linux/ppp_channel.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _PPP_CHANNEL_H_
+#define _PPP_CHANNEL_H_
+/*
+ * Definitions for the interface between the generic PPP code
+ * and a PPP channel.
+ *
+ * A PPP channel provides a way for the generic PPP code to send
+ * and receive packets over some sort of communications medium.
+ * Packets are stored in sk_buffs and have the 2-byte PPP protocol
+ * number at the start, but not the address and control bytes.
+ *
+ * Copyright 1999 Paul Mackerras.
+ *
+ * ==FILEVERSION 20000322==
+ */
+
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/poll.h>
+#include <net/net_namespace.h>
+
+struct net_device_path;
+struct net_device_path_ctx;
+struct ppp_channel;
+
+struct ppp_channel_ops {
+	/* Send a packet (or multilink fragment) on this channel.
+	   Returns 1 if it was accepted, 0 if not. */
+	int	(*start_xmit)(struct ppp_channel *, struct sk_buff *);
+	/* Handle an ioctl call that has come in via /dev/ppp. */
+	int	(*ioctl)(struct ppp_channel *, unsigned int, unsigned long);
+	int	(*fill_forward_path)(struct net_device_path_ctx *,
+				     struct net_device_path *,
+				     const struct ppp_channel *);
+};
+
+struct ppp_channel {
+	void		*private;	/* channel private data */
+	const struct ppp_channel_ops *ops; /* operations for this channel */
+	int		mtu;		/* max transmit packet size */
+	int		hdrlen;		/* amount of headroom channel needs */
+	void		*ppp;		/* opaque to channel */
+	int		speed;		/* transfer rate (bytes/second) */
+	/* the following is not used at present */
+	int		latency;	/* overhead time in milliseconds */
+};
+
+#ifdef __KERNEL__
+/* Called by the channel when it can send some more data. */
+extern void ppp_output_wakeup(struct ppp_channel *);
+
+/* Called by the channel to process a received PPP packet.
+   The packet should have just the 2-byte PPP protocol header. */
+extern void ppp_input(struct ppp_channel *, struct sk_buff *);
+
+/* Called by the channel when an input error occurs, indicating
+   that we may have missed a packet. */
+extern void ppp_input_error(struct ppp_channel *, int code);
+
+/* Attach a channel to a given PPP unit in specified net. */
+extern int ppp_register_net_channel(struct net *, struct ppp_channel *);
+
+/* Attach a channel to a given PPP unit. */
+extern int ppp_register_channel(struct ppp_channel *);
+
+/* Detach a channel from its PPP unit (e.g. on hangup). */
+extern void ppp_unregister_channel(struct ppp_channel *);
+
+/* Get the channel number for a channel */
+extern int ppp_channel_index(struct ppp_channel *);
+
+/* Get the unit number associated with a channel, or -1 if none */
+extern int ppp_unit_number(struct ppp_channel *);
+
+/* Get the device name associated with a channel, or NULL if none */
+extern char *ppp_dev_name(struct ppp_channel *);
+
+/*
+ * SMP locking notes:
+ * The channel code must ensure that when it calls ppp_unregister_channel,
+ * nothing is executing in any of the procedures above, for that
+ * channel.  The generic layer will ensure that nothing is executing
+ * in the start_xmit and ioctl routines for the channel by the time
+ * that ppp_unregister_channel returns.
+ */
+
+#endif /* __KERNEL__ */
+#endif