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1 /*      $NetBSD: btpand.h,v 1.1 2008/08/17 13:20:57 plunky Exp $        */
2
3 /*-
4  * SPDX-License-Identifier: BSD-2-Clause
5  *
6  * Copyright (c) 2008 Iain Hibbert
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29
30
31 #include <sys/types.h>
32 #include <sys/queue.h>
33 #include <sys/socket.h>
34
35 #include <net/if.h>
36 #include <net/ethernet.h>
37
38 #include <assert.h>
39 #include <bluetooth.h>
40 #include <stdbool.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <syslog.h>
44
45 #include "event.h"
46
47 #ifndef __arraycount
48 #define __arraycount(__x)       (int)(sizeof((__x)) / sizeof((__x)[0]))
49 #endif
50
51 #ifndef L2CAP_PSM_INVALID
52 #define L2CAP_PSM_INVALID(psm)  (((psm) & 0x0101) != 0x0001)
53 #endif
54
55 #ifndef L2CAP_PSM_BNEP
56 #define L2CAP_PSM_BNEP  15
57 #endif
58
59 typedef struct channel  channel_t;
60 typedef struct pfilter  pfilter_t;
61 typedef struct mfilter  mfilter_t;
62 typedef struct packet   packet_t;
63 typedef struct pkthdr   pkthdr_t;
64 typedef struct pktlist  pktlist_t;
65 typedef struct exthdr   exthdr_t;
66 typedef struct extlist  extlist_t;
67
68 LIST_HEAD(chlist, channel);
69 STAILQ_HEAD(extlist, exthdr);
70 STAILQ_HEAD(pktlist, pkthdr);
71
72 enum channel_state {
73         CHANNEL_CLOSED,
74         CHANNEL_WAIT_CONNECT_REQ,
75         CHANNEL_WAIT_CONNECT_RSP,
76         CHANNEL_OPEN,
77 };
78
79 #define CHANNEL_MAXQLEN         128
80
81 /* BNEP or tap channel */
82 struct channel {
83         enum channel_state      state;
84         bool                    oactive;
85
86         uint8_t                 laddr[ETHER_ADDR_LEN];
87         uint8_t                 raddr[ETHER_ADDR_LEN];
88         size_t                  mru;
89         size_t                  mtu;
90
91         int                     npfilter;
92         pfilter_t *             pfilter;
93
94         int                     nmfilter;
95         mfilter_t *             mfilter;
96
97         pktlist_t               pktlist;
98         int                     qlen;
99
100         int                     fd;
101         struct event            rd_ev;
102         struct event            wr_ev;
103         uint8_t *               sendbuf;
104
105         bool                    (*send)(channel_t *, packet_t *);
106         bool                    (*recv)(packet_t *);
107
108         int                     tick;
109
110         struct pidfh            *pfh;
111
112         int                     refcnt;
113         LIST_ENTRY(channel)     next;
114 };
115
116 /* network protocol type filter */
117 struct pfilter {
118         uint16_t        start;
119         uint16_t        end;
120 };
121
122 /* multicast address filter */
123 struct mfilter {
124         uint8_t         start[ETHER_ADDR_LEN];
125         uint8_t         end[ETHER_ADDR_LEN];
126 };
127
128 /* packet data buffer */
129 struct packet {
130         channel_t *             chan;   /* source channel */
131         uint8_t *               dst;    /* dest address */
132         uint8_t *               src;    /* source address */
133         uint8_t *               type;   /* protocol type */
134         uint8_t *               ptr;    /* data pointer */
135         size_t                  len;    /* data length */
136         int                     refcnt; /* reference count */
137         extlist_t               extlist;/* extension headers */
138         uint8_t                 buf[0]; /* data starts here */
139 };
140
141 /* extension header */
142 struct exthdr {
143         STAILQ_ENTRY(exthdr)    next;
144         uint8_t *               ptr;
145         uint8_t                 len;
146 };
147
148 /* packet header */
149 struct pkthdr {
150         STAILQ_ENTRY(pkthdr)    next;
151         packet_t *              data;
152 };
153
154 /* global variables */
155 extern const char *     control_path;
156 extern const char *     service_name;
157 extern const char *     interface_name;
158 extern bdaddr_t         local_bdaddr;
159 extern bdaddr_t         remote_bdaddr;
160 extern uint16_t         l2cap_psm;
161 extern int              l2cap_mode;
162 extern uint16_t         service_class;
163 extern int              server_limit;
164
165 /*
166  * Bluetooth addresses are stored the other way around than
167  * Ethernet addresses even though they are of the same family
168  */
169 static inline void
170 b2eaddr(void *dst, bdaddr_t *src)
171 {
172         uint8_t *d = dst;
173         int i;
174
175         for (i = 0; i < ETHER_ADDR_LEN; i++)
176                 d[i] = src->b[ETHER_ADDR_LEN - i - 1];
177 }
178
179 #define log_err(fmt, args...)           syslog(LOG_ERR, fmt , ##args)
180 #define log_info(fmt, args...)          syslog(LOG_INFO, fmt , ##args)
181 #define log_notice(fmt, args...)        syslog(LOG_NOTICE, fmt , ##args)
182 #define log_debug(fmt, args...)         syslog(LOG_DEBUG, "%s: " fmt, __func__ , ##args)
183
184 /* bnep.c */
185 bool            bnep_send(channel_t *, packet_t *);
186 bool            bnep_recv(packet_t *);
187 void            bnep_send_control(channel_t *, unsigned, ...);
188
189 /* channel.c */
190 void            channel_init(void);
191 channel_t *     channel_alloc(void);
192 bool            channel_open(channel_t *, int);
193 void            channel_close(channel_t *);
194 void            channel_free(channel_t *);
195 void            channel_timeout(channel_t *, int);
196 void            channel_put(channel_t *, packet_t *);
197
198 /* client.c */
199 void            client_init(void);
200
201 /* packet.c */
202 packet_t *      packet_alloc(channel_t *);
203 void            packet_free(packet_t *);
204 void            packet_adj(packet_t *, size_t);
205 pkthdr_t *      pkthdr_alloc(packet_t *);
206 void            pkthdr_free(pkthdr_t *);
207
208 /* server.c */
209 void            server_init(void);
210 void            server_update(int);
211
212 /* tap.c */
213 void            tap_init(void);