1 /* PPPoE support library "libpppoe"
3 * Copyright 2000 Michal Ostrowski <mostrows@styx.uwaterloo.ca>,
4 * Jamal Hadi Salim <hadi@cyberus.ca>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
14 #include <stdio.h> /* stdio */
15 #include <stdlib.h> /* strtoul(), realloc() */
16 #include <unistd.h> /* STDIN_FILENO,exec */
17 #include <string.h> /* memcpy() */
18 #include <errno.h> /* errno */
25 #include <sys/types.h> /* socket types */
26 #include <asm/types.h>
29 #include <sys/fcntl.h>
30 #include <sys/ioctl.h> /* ioctl() */
31 #include <sys/select.h>
32 #include <sys/socket.h> /* socket() */
33 #include <net/if.h> /* ifreq struct */
34 #include <net/if_arp.h>
35 #include <netinet/in.h>
37 #if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1
38 #include <netpacket/packet.h>
39 //#include <net/ethernet.h>
41 #include <asm/types.h>
42 #include <linux/if_packet.h>
43 #include <linux/if_ether.h>
47 #include <asm/byteorder.h>
50 jamal: we really have to change this
51 to make it compatible to the 2.2 and
55 #include <linux/if_pppox.h>
59 #define DISCONNECTED 0
62 #define _PATH_PPPD "/usr/sbin/pppd"
66 #define LOG_PPPOE LOG_DAEMON
70 #define VERSION_MAJOR 0
71 #define VERSION_MINOR 4
72 #define VERSION_DATE 991120
74 /* Bigger than the biggest ethernet packet we'll ever see, in bytes */
75 #define MAX_PACKET 2000
77 /* references: RFC 2516 */
78 /* ETHER_TYPE fields for PPPoE */
80 #define ETH_P_PPPOE_DISC 0x8863 /* discovery stage */
81 #define ETH_P_PPPOE_SESS 0x8864
83 /* ethernet broadcast address */
84 #define MAC_BCAST_ADDR "\xff\xff\xff\xff\xff\xff"
86 /* Format for parsing long device-name */
88 #define FMTSTRING(size) "%x:%x:%x:%x:%x:%x/%x/%" _STR(size) "s"
90 /* maximum payload length */
91 #define MAX_PAYLOAD 1484
99 /* PPPoE packet; includes Ethernet headers and such */
101 struct sockaddr_ll addr;
102 struct pppoe_tag *tags[MAX_TAGS];
103 struct pppoe_hdr *hdr;
104 char buf[MAX_PAYLOAD]; /* buffer in which tags are held */
106 /* Defines meaning of each "tags" element */
108 #define TAG_SRV_NAME 0
109 #define TAG_AC_NAME 1
110 #define TAG_HOST_UNIQ 2
111 #define TAG_AC_COOKIE 3
113 #define TAG_RELAY_SID 5
114 #define TAG_SRV_ERR 6
115 #define TAG_SYS_ERR 7
116 #define TAG_GEN_ERR 8
119 static int tag_map[] = { PTT_SRV_NAME,
133 int DEB_DISC,DEB_DISC2;
135 #define DEB_DISC (opt_debug & 0x0002)
136 #define DEB_DISC2 (opt_debug & 0x0004)
138 #define MAX_FNAME 256
143 /* return <0 --> fatal error; abor
144 return =0 --> ok, proceed
145 return >0 --> ok, qui
147 typedef int (*packet_cb_t)(struct session* ses,
148 struct pppoe_packet *p_in,
149 struct pppoe_packet **p_out);
151 /* various override filter tags */
153 struct pppoe_tag *stag; /* service name tag override */
154 struct pppoe_tag *ntag; /*AC name override */
155 struct pppoe_tag *htag; /* hostuniq override */
160 } __attribute__ ((packed));
163 struct pppoe_tag *make_filter_tag(short type, short length, char* data);
165 /* Session type definitions */
166 #define SESSION_CLIENT 0
167 #define SESSION_SERVER 1
168 #define SESSION_RELAY 2
178 int ifindex; /* index of device */
179 char name[IFNAMSIZ]; /*dev name */
180 struct pppoe_packet curr_pkt;
182 packet_cb_t init_disc;
183 packet_cb_t rcv_pado;
184 packet_cb_t rcv_padi;
185 packet_cb_t rcv_pads;
186 packet_cb_t rcv_padr;
187 packet_cb_t rcv_padt;
193 struct sockaddr_ll local;
194 struct sockaddr_ll remote;
195 struct sockaddr_pppox sp;
196 int fd; /* fd of PPPoE socket */
200 int retransmits; /* Number of retransmission performed
201 if < 0 , retransmissions disabled */
211 char fwd_name[IFNAMSIZ]; /* Name of device to forward to */
212 } __attribute__ ((packed));
215 retransmit retries for the PADR and PADI packets
227 /* Structure for keeping track of connection relays */
229 struct pppoe_con *next;
235 char client[ETH_ALEN];
236 char server[ETH_ALEN];
241 /* Functions exported from utils.c. */
243 /* Functions exported from pppoehash.c */
244 struct pppoe_con *get_con(int len, char *key);
245 int store_con(struct pppoe_con *pc);
246 struct pppoe_con *delete_con(unsigned long len, char *key);
248 /* exported by lib.c */
250 extern int init_lib();
252 extern int get_sockaddr_ll(const char *devnam,struct sockaddr_ll* sll);
254 extern int client_init_ses (struct session *ses, char* devnam);
255 extern int relay_init_ses(struct session *ses, char* from, char* to);
256 extern int srv_init_ses(struct session *ses, char* from);
257 extern int session_connect(struct session *ses);
258 extern int session_disconnect(struct session*ses);
260 extern int verify_packet( struct session *ses, struct pppoe_packet *p);
262 extern void copy_tag(struct pppoe_packet *dest, struct pppoe_tag *pt);
263 extern struct pppoe_tag *get_tag(struct pppoe_hdr *ph, u_int16_t idx);
264 extern int send_disc(struct session *ses, struct pppoe_packet *p);
267 extern int add_client(char *addr);
269 /* Make connections (including spawning pppd) as server/client */
270 extern ppp_connect(struct session *ses);