v4.19.13 snapshot.
diff --git a/include/linux/isdn_ppp.h b/include/linux/isdn_ppp.h
new file mode 100644
index 0000000..a0070c6
--- /dev/null
+++ b/include/linux/isdn_ppp.h
@@ -0,0 +1,194 @@
+/* Linux ISDN subsystem, sync PPP, interface to ipppd
+ *
+ * Copyright 1994-1999 by Fritz Elfert (fritz@isdn4linux.de)
+ * Copyright 1995,96 Thinking Objects Software GmbH Wuerzburg
+ * Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
+ * Copyright 2000-2002 by Kai Germaschewski (kai@germaschewski.name)
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+#ifndef _LINUX_ISDN_PPP_H
+#define _LINUX_ISDN_PPP_H
+
+
+
+
+#ifdef CONFIG_IPPP_FILTER
+#include <linux/filter.h>
+#endif
+#include <uapi/linux/isdn_ppp.h>
+
+#define DECOMP_ERR_NOMEM (-10)
+
+#define MP_END_FRAG 0x40
+#define MP_BEGIN_FRAG 0x80
+
+#define MP_MAX_QUEUE_LEN 16
+
+/*
+ * We need a way for the decompressor to influence the generation of CCP
+ * Reset-Requests in a variety of ways. The decompressor is already returning
+ * a lot of information (generated skb length, error conditions) so we use
+ * another parameter. This parameter is a pointer to a structure which is
+ * to be marked valid by the decompressor and only in this case is ever used.
+ * Furthermore, the only case where this data is used is when the decom-
+ * pressor returns DECOMP_ERROR.
+ *
+ * We use this same struct for the reset entry of the compressor to commu-
+ * nicate to its caller how to deal with sending of a Reset Ack. In this
+ * case, expra is not used, but other options still apply (suppressing
+ * sending with rsend, appending arbitrary data, etc).
+ */
+
+#define IPPP_RESET_MAXDATABYTES 32
+
+struct isdn_ppp_resetparams {
+ unsigned char valid:1; /* rw Is this structure filled at all ? */
+ unsigned char rsend:1; /* rw Should we send one at all ? */
+ unsigned char idval:1; /* rw Is the id field valid ? */
+ unsigned char dtval:1; /* rw Is the data field valid ? */
+ unsigned char expra:1; /* rw Is an Ack expected for this Req ? */
+ unsigned char id; /* wo Send CCP ResetReq with this id */
+ unsigned short maxdlen; /* ro Max bytes to be stored in data field */
+ unsigned short dlen; /* rw Bytes stored in data field */
+ unsigned char *data; /* wo Data for ResetReq info field */
+};
+
+/*
+ * this is an 'old friend' from ppp-comp.h under a new name
+ * check the original include for more information
+ */
+struct isdn_ppp_compressor {
+ struct isdn_ppp_compressor *next, *prev;
+ struct module *owner;
+ int num; /* CCP compression protocol number */
+
+ void *(*alloc) (struct isdn_ppp_comp_data *);
+ void (*free) (void *state);
+ int (*init) (void *state, struct isdn_ppp_comp_data *,
+ int unit,int debug);
+
+ /* The reset entry needs to get more exact information about the
+ ResetReq or ResetAck it was called with. The parameters are
+ obvious. If reset is called without a Req or Ack frame which
+ could be handed into it, code MUST be set to 0. Using rsparm,
+ the reset entry can control if and how a ResetAck is returned. */
+
+ void (*reset) (void *state, unsigned char code, unsigned char id,
+ unsigned char *data, unsigned len,
+ struct isdn_ppp_resetparams *rsparm);
+
+ int (*compress) (void *state, struct sk_buff *in,
+ struct sk_buff *skb_out, int proto);
+
+ int (*decompress) (void *state,struct sk_buff *in,
+ struct sk_buff *skb_out,
+ struct isdn_ppp_resetparams *rsparm);
+
+ void (*incomp) (void *state, struct sk_buff *in,int proto);
+ void (*stat) (void *state, struct compstat *stats);
+};
+
+extern int isdn_ppp_register_compressor(struct isdn_ppp_compressor *);
+extern int isdn_ppp_unregister_compressor(struct isdn_ppp_compressor *);
+extern int isdn_ppp_dial_slave(char *);
+extern int isdn_ppp_hangup_slave(char *);
+
+typedef struct {
+ unsigned long seqerrs;
+ unsigned long frame_drops;
+ unsigned long overflows;
+ unsigned long max_queue_len;
+} isdn_mppp_stats;
+
+typedef struct {
+ int mp_mrru; /* unused */
+ struct sk_buff * frags; /* fragments sl list -- use skb->next */
+ long frames; /* number of frames in the frame list */
+ unsigned int seq; /* last processed packet seq #: any packets
+ * with smaller seq # will be dropped
+ * unconditionally */
+ spinlock_t lock;
+ int ref_ct;
+ /* statistics */
+ isdn_mppp_stats stats;
+} ippp_bundle;
+
+#define NUM_RCV_BUFFS 64
+
+struct ippp_buf_queue {
+ struct ippp_buf_queue *next;
+ struct ippp_buf_queue *last;
+ char *buf; /* NULL here indicates end of queue */
+ int len;
+};
+
+/* The data structure for one CCP reset transaction */
+enum ippp_ccp_reset_states {
+ CCPResetIdle,
+ CCPResetSentReq,
+ CCPResetRcvdReq,
+ CCPResetSentAck,
+ CCPResetRcvdAck
+};
+
+struct ippp_ccp_reset_state {
+ enum ippp_ccp_reset_states state; /* State of this transaction */
+ struct ippp_struct *is; /* Backlink to device stuff */
+ unsigned char id; /* Backlink id index */
+ unsigned char ta:1; /* The timer is active (flag) */
+ unsigned char expra:1; /* We expect a ResetAck at all */
+ int dlen; /* Databytes stored in data */
+ struct timer_list timer; /* For timeouts/retries */
+ /* This is a hack but seems sufficient for the moment. We do not want
+ to have this be yet another allocation for some bytes, it is more
+ memory management overhead than the whole mess is worth. */
+ unsigned char data[IPPP_RESET_MAXDATABYTES];
+};
+
+/* The data structure keeping track of the currently outstanding CCP Reset
+ transactions. */
+struct ippp_ccp_reset {
+ struct ippp_ccp_reset_state *rs[256]; /* One per possible id */
+ unsigned char lastid; /* Last id allocated by the engine */
+};
+
+struct ippp_struct {
+ struct ippp_struct *next_link;
+ int state;
+ spinlock_t buflock;
+ struct ippp_buf_queue rq[NUM_RCV_BUFFS]; /* packet queue for isdn_ppp_read() */
+ struct ippp_buf_queue *first; /* pointer to (current) first packet */
+ struct ippp_buf_queue *last; /* pointer to (current) last used packet in queue */
+ wait_queue_head_t wq;
+ struct task_struct *tk;
+ unsigned int mpppcfg;
+ unsigned int pppcfg;
+ unsigned int mru;
+ unsigned int mpmru;
+ unsigned int mpmtu;
+ unsigned int maxcid;
+ struct isdn_net_local_s *lp;
+ int unit;
+ int minor;
+ unsigned int last_link_seqno;
+ long mp_seqno;
+#ifdef CONFIG_ISDN_PPP_VJ
+ unsigned char *cbuf;
+ struct slcompress *slcomp;
+#endif
+#ifdef CONFIG_IPPP_FILTER
+ struct bpf_prog *pass_filter; /* filter for packets to pass */
+ struct bpf_prog *active_filter; /* filter for pkts to reset idle */
+#endif
+ unsigned long debug;
+ struct isdn_ppp_compressor *compressor,*decompressor;
+ struct isdn_ppp_compressor *link_compressor,*link_decompressor;
+ void *decomp_stat,*comp_stat,*link_decomp_stat,*link_comp_stat;
+ struct ippp_ccp_reset *reset; /* Allocated on demand, may never be needed */
+ unsigned long compflags;
+};
+
+#endif /* _LINUX_ISDN_PPP_H */