1 /* Linux ISDN subsystem, sync PPP, interface to ipppd
2 *
3 * Copyright 1994-1999 by Fritz Elfert (fritz@isdn4linux.de)
4 * Copyright 1995,96 Thinking Objects Software GmbH Wuerzburg
5 * Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
6 * Copyright 2000-2002 by Kai Germaschewski (kai@germaschewski.name)
7 *
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
10 *
11 */
12
13 #ifndef _LINUX_ISDN_PPP_H
14 #define _LINUX_ISDN_PPP_H
15
16 #define CALLTYPE_INCOMING 0x1
17 #define CALLTYPE_OUTGOING 0x2
18 #define CALLTYPE_CALLBACK 0x4
19
20 #define IPPP_VERSION "2.2.0"
21
22 struct pppcallinfo
23 {
24 int calltype;
25 unsigned char local_num[64];
26 unsigned char remote_num[64];
27 int charge_units;
28 };
29
30 #define PPPIOCGCALLINFO _IOWR('t',128,struct pppcallinfo)
31 #define PPPIOCBUNDLE _IOW('t',129,int)
32 #define PPPIOCGMPFLAGS _IOR('t',130,int)
33 #define PPPIOCSMPFLAGS _IOW('t',131,int)
34 #define PPPIOCSMPMTU _IOW('t',132,int)
35 #define PPPIOCSMPMRU _IOW('t',133,int)
36 #define PPPIOCGCOMPRESSORS _IOR('t',134,unsigned long [8])
37 #define PPPIOCSCOMPRESSOR _IOW('t',135,int)
38 #define PPPIOCGIFNAME _IOR('t',136, char [IFNAMSIZ] )
39
40
41 #define SC_MP_PROT 0x00000200
42 #define SC_REJ_MP_PROT 0x00000400
43 #define SC_OUT_SHORT_SEQ 0x00000800
44 #define SC_IN_SHORT_SEQ 0x00004000
45
46 #define SC_DECOMP_ON 0x01
47 #define SC_COMP_ON 0x02
48 #define SC_DECOMP_DISCARD 0x04
49 #define SC_COMP_DISCARD 0x08
50 #define SC_LINK_DECOMP_ON 0x10
51 #define SC_LINK_COMP_ON 0x20
52 #define SC_LINK_DECOMP_DISCARD 0x40
53 #define SC_LINK_COMP_DISCARD 0x80
54
55 #define ISDN_PPP_COMP_MAX_OPTIONS 16
56
57 #define IPPP_COMP_FLAG_XMIT 0x1
58 #define IPPP_COMP_FLAG_LINK 0x2
59
60 struct isdn_ppp_comp_data {
61 int num;
62 unsigned char options[ISDN_PPP_COMP_MAX_OPTIONS];
63 int optlen;
64 int flags;
65 };
66
67 #ifdef __KERNEL__
68
69
70
71 #ifdef CONFIG_IPPP_FILTER
72 #include <linux/filter.h>
73 #endif
74
75 #define DECOMP_ERR_NOMEM (-10)
76
77 #define MP_END_FRAG 0x40
78 #define MP_BEGIN_FRAG 0x80
79
80 #define MP_MAX_QUEUE_LEN 16
81
82 /*
83 * We need a way for the decompressor to influence the generation of CCP
84 * Reset-Requests in a variety of ways. The decompressor is already returning
85 * a lot of information (generated skb length, error conditions) so we use
86 * another parameter. This parameter is a pointer to a structure which is
87 * to be marked valid by the decompressor and only in this case is ever used.
88 * Furthermore, the only case where this data is used is when the decom-
89 * pressor returns DECOMP_ERROR.
90 *
91 * We use this same struct for the reset entry of the compressor to commu-
92 * nicate to its caller how to deal with sending of a Reset Ack. In this
93 * case, expra is not used, but other options still apply (suppressing
94 * sending with rsend, appending arbitrary data, etc).
95 */
96
97 #define IPPP_RESET_MAXDATABYTES 32
98
99 struct isdn_ppp_resetparams {
100 unsigned char valid:1; /* rw Is this structure filled at all ? */
101 unsigned char rsend:1; /* rw Should we send one at all ? */
102 unsigned char idval:1; /* rw Is the id field valid ? */
103 unsigned char dtval:1; /* rw Is the data field valid ? */
104 unsigned char expra:1; /* rw Is an Ack expected for this Req ? */
105 unsigned char id; /* wo Send CCP ResetReq with this id */
106 unsigned short maxdlen; /* ro Max bytes to be stored in data field */
107 unsigned short dlen; /* rw Bytes stored in data field */
108 unsigned char *data; /* wo Data for ResetReq info field */
109 };
110
111 /*
112 * this is an 'old friend' from ppp-comp.h under a new name
113 * check the original include for more information
114 */
115 struct isdn_ppp_compressor {
116 struct isdn_ppp_compressor *next, *prev;
117 struct module *owner;
118 int num; /* CCP compression protocol number */
119
120 void *(*alloc) (struct isdn_ppp_comp_data *);
121 void (*free) (void *state);
122 int (*init) (void *state, struct isdn_ppp_comp_data *,
123 int unit,int debug);
124
125 /* The reset entry needs to get more exact information about the
126 ResetReq or ResetAck it was called with. The parameters are
127 obvious. If reset is called without a Req or Ack frame which
128 could be handed into it, code MUST be set to 0. Using rsparm,
129 the reset entry can control if and how a ResetAck is returned. */
130
131 void (*reset) (void *state, unsigned char code, unsigned char id,
132 unsigned char *data, unsigned len,
133 struct isdn_ppp_resetparams *rsparm);
134
135 int (*compress) (void *state, struct sk_buff *in,
136 struct sk_buff *skb_out, int proto);
137
138 int (*decompress) (void *state,struct sk_buff *in,
139 struct sk_buff *skb_out,
140 struct isdn_ppp_resetparams *rsparm);
141
142 void (*incomp) (void *state, struct sk_buff *in,int proto);
143 void (*stat) (void *state, struct compstat *stats);
144 };
145
146 extern int isdn_ppp_register_compressor(struct isdn_ppp_compressor *);
147 extern int isdn_ppp_unregister_compressor(struct isdn_ppp_compressor *);
148 extern int isdn_ppp_dial_slave(char *);
149 extern int isdn_ppp_hangup_slave(char *);
150
151 typedef struct {
152 unsigned long seqerrs;
153 unsigned long frame_drops;
154 unsigned long overflows;
155 unsigned long max_queue_len;
156 } isdn_mppp_stats;
157
158 typedef struct {
159 int mp_mrru; /* unused */
160 struct sk_buff * frags; /* fragments sl list -- use skb->next */
161 long frames; /* number of frames in the frame list */
162 unsigned int seq; /* last processed packet seq #: any packets
163 * with smaller seq # will be dropped
164 * unconditionally */
165 spinlock_t lock;
166 int ref_ct;
167 /* statistics */
168 isdn_mppp_stats stats;
169 } ippp_bundle;
170
171 #define NUM_RCV_BUFFS 64
172
173 struct ippp_buf_queue {
174 struct ippp_buf_queue *next;
175 struct ippp_buf_queue *last;
176 char *buf; /* NULL here indicates end of queue */
177 int len;
178 };
179
180 /* The data structure for one CCP reset transaction */
181 enum ippp_ccp_reset_states {
182 CCPResetIdle,
183 CCPResetSentReq,
184 CCPResetRcvdReq,
185 CCPResetSentAck,
186 CCPResetRcvdAck
187 };
188
189 struct ippp_ccp_reset_state {
190 enum ippp_ccp_reset_states state; /* State of this transaction */
191 struct ippp_struct *is; /* Backlink to device stuff */
192 unsigned char id; /* Backlink id index */
193 unsigned char ta:1; /* The timer is active (flag) */
194 unsigned char expra:1; /* We expect a ResetAck at all */
195 int dlen; /* Databytes stored in data */
196 struct timer_list timer; /* For timeouts/retries */
197 /* This is a hack but seems sufficient for the moment. We do not want
198 to have this be yet another allocation for some bytes, it is more
199 memory management overhead than the whole mess is worth. */
200 unsigned char data[IPPP_RESET_MAXDATABYTES];
201 };
202
203 /* The data structure keeping track of the currently outstanding CCP Reset
204 transactions. */
205 struct ippp_ccp_reset {
206 struct ippp_ccp_reset_state *rs[256]; /* One per possible id */
207 unsigned char lastid; /* Last id allocated by the engine */
208 };
209
210 struct ippp_struct {
211 struct ippp_struct *next_link;
212 int state;
213 spinlock_t buflock;
214 struct ippp_buf_queue rq[NUM_RCV_BUFFS]; /* packet queue for isdn_ppp_read() */
215 struct ippp_buf_queue *first; /* pointer to (current) first packet */
216 struct ippp_buf_queue *last; /* pointer to (current) last used packet in queue */
217 wait_queue_head_t wq;
218 struct task_struct *tk;
219 unsigned int mpppcfg;
220 unsigned int pppcfg;
221 unsigned int mru;
222 unsigned int mpmru;
223 unsigned int mpmtu;
224 unsigned int maxcid;
225 struct isdn_net_local_s *lp;
226 int unit;
227 int minor;
228 unsigned int last_link_seqno;
229 long mp_seqno;
230 #ifdef CONFIG_ISDN_PPP_VJ
231 unsigned char *cbuf;
232 struct slcompress *slcomp;
233 #endif
234 #ifdef CONFIG_IPPP_FILTER
235 struct sock_filter *pass_filter; /* filter for packets to pass */
236 struct sock_filter *active_filter; /* filter for pkts to reset idle */
237 unsigned pass_len, active_len;
238 #endif
239 unsigned long debug;
240 struct isdn_ppp_compressor *compressor,*decompressor;
241 struct isdn_ppp_compressor *link_compressor,*link_decompressor;
242 void *decomp_stat,*comp_stat,*link_decomp_stat,*link_comp_stat;
243 struct ippp_ccp_reset *reset; /* Allocated on demand, may never be needed */
244 unsigned long compflags;
245 };
246
247 #endif /* __KERNEL__ */
248 #endif /* _LINUX_ISDN_PPP_H */
249
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