| /* 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 */ |