2 /* PPPoE support library "libpppoe"
4 * Copyright 2000 Michal Ostrowski <mostrows@styx.uwaterloo.ca>,
5 * Jamal Hadi Salim <hadi@cyberus.ca>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
15 #include <stdio.h> /* stdio */
16 #include <stdlib.h> /* strtoul(), realloc() */
17 #include <unistd.h> /* STDIN_FILENO,exec */
18 #include <string.h> /* memcpy() */
19 #include <errno.h> /* errno */
26 #include <sys/types.h> /* socket types */
27 #include <asm/types.h>
30 #include <sys/fcntl.h>
31 #include <sys/ioctl.h> /* ioctl() */
32 #include <sys/select.h>
33 #include <sys/socket.h> /* socket() */
34 #include <net/if.h> /* ifreq struct */
35 #include <net/if_arp.h>
36 #include <netinet/in.h>
38 #if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1
39 #include <netpacket/packet.h>
40 //#include <net/ethernet.h>
42 #include <asm/types.h>
43 #include <linux/if_packet.h>
44 #include <linux/if_ether.h>
48 #include <asm/byteorder.h>
51 jamal: we really have to change this
52 to make it compatible to the 2.2 and
56 #include <linux/if_pppox.h>
60 #define DISCONNECTED 0
63 #define _PATH_PPPD "/usr/sbin/pppd"
67 #define LOG_PPPOE LOG_DAEMON
71 #define VERSION_MAJOR 0
72 #define VERSION_MINOR 4
73 #define VERSION_DATE 991120
75 /* Bigger than the biggest ethernet packet we'll ever see, in bytes */
76 #define MAX_PACKET 2000
78 /* references: RFC 2516 */
79 /* ETHER_TYPE fields for PPPoE */
81 #define ETH_P_PPPOE_DISC 0x8863 /* discovery stage */
82 #define ETH_P_PPPOE_SESS 0x8864
84 /* ethernet broadcast address */
85 #define MAC_BCAST_ADDR "\xff\xff\xff\xff\xff\xff"
87 /* Format for parsing long device-name */
89 #define FMTSTRING(size) "%x:%x:%x:%x:%x:%x/%x/%" _STR(size) "s"
91 /* maximum payload length */
92 #define MAX_PAYLOAD 1484
100 /* PPPoE packet; includes Ethernet headers and such */
102 struct sockaddr_ll addr
;
103 struct pppoe_tag
*tags
[MAX_TAGS
];
104 struct pppoe_hdr
*hdr
;
105 char buf
[MAX_PAYLOAD
]; /* buffer in which tags are held */
107 /* Defines meaning of each "tags" element */
109 #define TAG_SRV_NAME 0
110 #define TAG_AC_NAME 1
111 #define TAG_HOST_UNIQ 2
112 #define TAG_AC_COOKIE 3
114 #define TAG_RELAY_SID 5
115 #define TAG_SRV_ERR 6
116 #define TAG_SYS_ERR 7
117 #define TAG_GEN_ERR 8
120 static int tag_map
[] = { PTT_SRV_NAME
,
134 int DEB_DISC
,DEB_DISC2
;
136 #define DEB_DISC (opt_debug & 0x0002)
137 #define DEB_DISC2 (opt_debug & 0x0004)
139 #define MAX_FNAME 256
144 /* return <0 --> fatal error; abor
145 return =0 --> ok, proceed
146 return >0 --> ok, qui
148 typedef int (*packet_cb_t
)(struct session
* ses
,
149 struct pppoe_packet
*p_in
,
150 struct pppoe_packet
**p_out
);
152 /* various override filter tags */
154 struct pppoe_tag
*stag
; /* service name tag override */
155 struct pppoe_tag
*ntag
; /*AC name override */
156 struct pppoe_tag
*htag
; /* hostuniq override */
161 } __attribute__ ((packed
));
164 struct pppoe_tag
*make_filter_tag(short type
, short length
, char* data
);
166 /* Session type definitions */
167 #define SESSION_CLIENT 0
168 #define SESSION_SERVER 1
169 #define SESSION_RELAY 2
179 int ifindex
; /* index of device */
180 char name
[IFNAMSIZ
]; /*dev name */
181 struct pppoe_packet curr_pkt
;
183 packet_cb_t init_disc
;
184 packet_cb_t rcv_pado
;
185 packet_cb_t rcv_padi
;
186 packet_cb_t rcv_pads
;
187 packet_cb_t rcv_padr
;
188 packet_cb_t rcv_padt
;
194 struct sockaddr_ll local
;
195 struct sockaddr_ll remote
;
196 struct sockaddr_pppox sp
;
197 int fd
; /* fd of PPPoE socket */
201 int retransmits
; /* Number of retransmission performed
202 if < 0 , retransmissions disabled */
212 char fwd_name
[IFNAMSIZ
]; /* Name of device to forward to */
213 } __attribute__ ((packed
));
216 retransmit retries for the PADR and PADI packets
228 /* Structure for keeping track of connection relays */
230 struct pppoe_con
*next
;
236 char client
[ETH_ALEN
];
237 char server
[ETH_ALEN
];
242 /* Functions exported from utils.c. */
244 /* Functions exported from pppoehash.c */
245 struct pppoe_con
*get_con(int len
, char *key
);
246 int store_con(struct pppoe_con
*pc
);
247 struct pppoe_con
*delete_con(unsigned long len
, char *key
);
249 /* exported by lib.c */
251 extern int init_lib();
253 extern int get_sockaddr_ll(const char *devnam
,struct sockaddr_ll
* sll
);
255 extern int client_init_ses (struct session
*ses
, char* devnam
);
256 extern int relay_init_ses(struct session
*ses
, char* from
, char* to
);
257 extern int srv_init_ses(struct session
*ses
, char* from
);
258 extern int session_connect(struct session
*ses
);
259 extern int session_disconnect(struct session
*ses
);
261 extern int verify_packet( struct session
*ses
, struct pppoe_packet
*p
);
263 extern void copy_tag(struct pppoe_packet
*dest
, struct pppoe_tag
*pt
);
264 extern struct pppoe_tag
*get_tag(struct pppoe_hdr
*ph
, u_int16_t idx
);
265 extern int send_disc(struct session
*ses
, struct pppoe_packet
*p
);
268 extern int add_client(char *addr
);
270 /* Make connections (including spawning pppd) as server/client */
271 extern ppp_connect(struct session
*ses
);