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