1 /***********************************************************************
5 * pppd plugin for kernel-mode PPPoE on Linux
7 * Copyright (C) 2001 by Roaring Penguin Software Inc., Michal Ostrowski
8 * and Jamal Hadi Salim.
10 * Much code and many ideas derived from pppoe plugin by Michal
11 * Ostrowski and Jamal Hadi Salim, which carries this copyright:
13 * Copyright 2000 Michal Ostrowski <mostrows@styx.uwaterloo.ca>,
14 * Jamal Hadi Salim <hadi@cyberus.ca>
15 * Borrows heavily from the PPPoATM plugin by Mitchell Blank Jr.,
16 * which is based in part on work from Jens Axboe and Paul Mackerras.
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 ***********************************************************************/
24 static char const RCSID[] =
25 "$Id: plugin.c,v 1.13 2005/07/09 09:12:48 paulus Exp $";
30 #include "pppd/pppd.h"
33 #include "pppd/ipcp.h"
35 #include "pppd/pathnames.h"
37 #include <linux/types.h>
39 #include <sys/ioctl.h>
40 #include <sys/types.h>
41 #include <sys/socket.h>
49 #include <net/ethernet.h>
50 #include <net/if_arp.h>
55 #define _PATH_ETHOPT _ROOT_PATH "/etc/ppp/options."
57 char pppd_version[] = VERSION;
59 /* From sys-linux.c in pppd -- MUST FIX THIS! */
60 extern int new_style_driver;
62 char *pppd_pppoe_service = NULL;
63 static char *acName = NULL;
64 static char *existingSession = NULL;
65 static int printACNames = 0;
67 static int PPPoEDevnameHook(char *cmd, char **argv, int doit);
68 static option_t Options[] = {
69 { "device name", o_wild, (void *) &PPPoEDevnameHook,
71 OPT_DEVNAM | OPT_PRIVFIX | OPT_NOARG | OPT_A2STRVAL | OPT_STATIC,
73 { "rp_pppoe_service", o_string, &pppd_pppoe_service,
74 "Desired PPPoE service name" },
75 { "rp_pppoe_ac", o_string, &acName,
76 "Desired PPPoE access concentrator name" },
77 { "rp_pppoe_sess", o_string, &existingSession,
78 "Attach to existing session (sessid:macaddr)" },
79 { "rp_pppoe_verbose", o_int, &printACNames,
80 "Be verbose about discovered access concentrators"},
84 static PPPoEConnection *conn = NULL;
86 /**********************************************************************
87 * %FUNCTION: PPPOEInitDevice
93 * Initializes PPPoE device.
94 ***********************************************************************/
98 conn = malloc(sizeof(PPPoEConnection));
100 fatal("Could not allocate memory for PPPoE session");
102 memset(conn, 0, sizeof(PPPoEConnection));
104 SET_STRING(conn->acName, acName);
106 if (pppd_pppoe_service) {
107 SET_STRING(conn->serviceName, pppd_pppoe_service);
109 SET_STRING(conn->ifName, devnam);
110 conn->discoverySocket = -1;
111 conn->sessionSocket = -1;
112 conn->useHostUniq = 1;
113 conn->printACNames = printACNames;
117 /**********************************************************************
118 * %FUNCTION: PPPOEConnectDevice
122 * Non-negative if all goes well; -1 otherwise
124 * Connects PPPoE device.
125 ***********************************************************************/
127 PPPOEConnectDevice(void)
129 struct sockaddr_pppox sp;
131 strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
132 if (existingSession) {
133 unsigned int mac[ETH_ALEN];
135 if (sscanf(existingSession, "%d:%x:%x:%x:%x:%x:%x",
136 &ses, &mac[0], &mac[1], &mac[2],
137 &mac[3], &mac[4], &mac[5]) != 7) {
138 fatal("Illegal value for rp_pppoe_sess option");
140 conn->session = htons(ses);
141 for (i=0; i<ETH_ALEN; i++) {
142 conn->peerEth[i] = (unsigned char) mac[i];
146 if (conn->discoveryState != STATE_SESSION) {
147 error("Unable to complete PPPoE Discovery");
152 /* Set PPPoE session-number for further consumption */
153 ppp_session_number = ntohs(conn->session);
155 /* Make the session socket */
156 conn->sessionSocket = socket(AF_PPPOX, SOCK_STREAM, PX_PROTO_OE);
157 if (conn->sessionSocket < 0) {
158 fatal("Failed to create PPPoE socket: %m");
160 sp.sa_family = AF_PPPOX;
161 sp.sa_protocol = PX_PROTO_OE;
162 sp.sa_addr.pppoe.sid = conn->session;
163 memcpy(sp.sa_addr.pppoe.dev, conn->ifName, IFNAMSIZ);
164 memcpy(sp.sa_addr.pppoe.remote, conn->peerEth, ETH_ALEN);
166 /* Set remote_number for ServPoET */
167 sprintf(remote_number, "%02X:%02X:%02X:%02X:%02X:%02X",
168 (unsigned) conn->peerEth[0],
169 (unsigned) conn->peerEth[1],
170 (unsigned) conn->peerEth[2],
171 (unsigned) conn->peerEth[3],
172 (unsigned) conn->peerEth[4],
173 (unsigned) conn->peerEth[5]);
175 if (connect(conn->sessionSocket, (struct sockaddr *) &sp,
176 sizeof(struct sockaddr_pppox)) < 0) {
177 fatal("Failed to connect PPPoE socket: %d %m", errno);
181 return conn->sessionSocket;
185 PPPOERecvConfig(int mru,
190 if (mru > MAX_PPPOE_MTU)
191 warn("Couldn't increase MRU to %d", mru);
194 /**********************************************************************
195 * %FUNCTION: PPPOEDisconnectDevice
201 * Disconnects PPPoE device
202 ***********************************************************************/
204 PPPOEDisconnectDevice(void)
206 struct sockaddr_pppox sp;
208 sp.sa_family = AF_PPPOX;
209 sp.sa_protocol = PX_PROTO_OE;
210 sp.sa_addr.pppoe.sid = 0;
211 memcpy(sp.sa_addr.pppoe.dev, conn->ifName, IFNAMSIZ);
212 memcpy(sp.sa_addr.pppoe.remote, conn->peerEth, ETH_ALEN);
213 if (connect(conn->sessionSocket, (struct sockaddr *) &sp,
214 sizeof(struct sockaddr_pppox)) < 0) {
215 fatal("Failed to disconnect PPPoE socket: %d %m", errno);
218 close(conn->sessionSocket);
219 /* don't send PADT?? */
220 close(conn->discoverySocket);
224 PPPOEDeviceOptions(void)
227 snprintf(buf, 256, _PATH_ETHOPT "%s",devnam);
228 if(!options_from_file(buf, 0, 0, 1))
229 exit(EXIT_OPTION_ERROR);
233 struct channel pppoe_channel;
235 /**********************************************************************
236 * %FUNCTION: PPPoEDevnameHook
238 * cmd -- the command (actually, the device name
239 * argv -- argument vector
240 * doit -- if non-zero, set device name. Otherwise, just check if possible
242 * 1 if we will handle this device; 0 otherwise.
244 * Checks if name is a valid interface name; if so, returns 1. Also
245 * sets up devnam (string representation of device).
246 ***********************************************************************/
248 PPPoEDevnameHook(char *cmd, char **argv, int doit)
254 /* Only do it if name is "ethXXX", "nasXXX", "tapXXX" or "nic-XXXX.
255 In latter case strip off the "nic-" */
256 /* Thanks to Russ Couturier for this fix */
257 if (strlen(cmd) > 4 && !strncmp(cmd, "nic-", 4)) {
258 /* Strip off "nic-" */
260 } else if (strlen(cmd) < 4
261 || (strncmp(cmd, "eth", 3) && strncmp(cmd, "nas", 3)
262 && strncmp(cmd, "tap", 3) && strncmp(cmd, "br", 2))) {
267 if ((fd = socket(PF_PACKET, SOCK_RAW, 0)) < 0) {
271 /* Try getting interface index */
273 strncpy(ifr.ifr_name, cmd, sizeof(ifr.ifr_name));
274 if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
277 if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
280 if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
281 error("Interface %s not Ethernet", cmd);
291 strncpy(devnam, cmd, sizeof(devnam));
292 if (the_channel != &pppoe_channel) {
294 the_channel = &pppoe_channel;
297 lcp_allowoptions[0].neg_accompression = 0;
298 lcp_wantoptions[0].neg_accompression = 0;
300 lcp_allowoptions[0].neg_asyncmap = 0;
301 lcp_wantoptions[0].neg_asyncmap = 0;
303 lcp_allowoptions[0].neg_pcompression = 0;
304 lcp_wantoptions[0].neg_pcompression = 0;
306 lcp_allowoptions[0].mru = MAX_PPPOE_MTU;
307 lcp_wantoptions[0].mru = MAX_PPPOE_MTU;
309 ccp_allowoptions[0].deflate = 0 ;
310 ccp_wantoptions[0].deflate = 0 ;
312 ipcp_allowoptions[0].neg_vj=0;
313 ipcp_wantoptions[0].neg_vj=0;
315 ccp_allowoptions[0].bsd_compress = 0;
316 ccp_wantoptions[0].bsd_compress = 0;
326 /**********************************************************************
327 * %FUNCTION: plugin_init
333 * Initializes hooks for pppd plugin
334 ***********************************************************************/
338 if (!ppp_available() && !new_style_driver) {
339 fatal("Linux kernel does not support PPPoE -- are you running 2.4.x?");
342 add_options(Options);
344 info("RP-PPPoE plugin version %s compiled against pppd %s",
345 RP_VERSION, VERSION);
348 /**********************************************************************
351 * str -- error message
355 * Prints a message plus the errno value to stderr and syslog and exits.
356 ***********************************************************************/
358 fatalSys(char const *str)
362 sprintf(buf, "%.256s: %.256s", str, strerror(i));
364 sprintf(buf, "RP-PPPoE: %.256s: %.256s", str, strerror(i));
369 /**********************************************************************
372 * str -- error message
376 * Prints a message to stderr and syslog and exits.
377 ***********************************************************************/
379 rp_fatal(char const *str)
383 sprintf(buf, "RP-PPPoE: %.256s", str);
387 /**********************************************************************
390 * str -- error message
394 * Prints a message plus the errno value to syslog.
395 ***********************************************************************/
397 sysErr(char const *str)
403 struct channel pppoe_channel = {
405 process_extra_options: &PPPOEDeviceOptions,
407 connect: &PPPOEConnectDevice,
408 disconnect: &PPPOEDisconnectDevice,
409 establish_ppp: &generic_establish_ppp,
410 disestablish_ppp: &generic_disestablish_ppp,
412 recv_config: &PPPOERecvConfig,