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.
23 ***********************************************************************/
25 static char const RCSID[] =
26 "$Id: plugin.c,v 1.17 2008/06/15 04:35:50 paulus Exp $";
31 #include "pppd/pppd.h"
34 #include "pppd/ipcp.h"
36 /* #include "pppd/pathnames.h" */
38 #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>
51 #include <linux/ppp_defs.h>
52 #include <linux/if_pppox.h>
58 #define _PATH_ETHOPT _ROOT_PATH "/etc/ppp/options."
60 char pppd_version[] = VERSION;
62 /* From sys-linux.c in pppd -- MUST FIX THIS! */
63 extern int new_style_driver;
65 char *pppd_pppoe_service = NULL;
66 static char *acName = NULL;
67 static char *existingSession = NULL;
68 static int printACNames = 0;
69 static char *pppoe_reqd_mac = NULL;
70 unsigned char pppoe_reqd_mac_addr[6];
71 static char *host_uniq;
73 static int PPPoEDevnameHook(char *cmd, char **argv, int doit);
74 static option_t Options[] = {
75 { "device name", o_wild, (void *) &PPPoEDevnameHook,
77 OPT_DEVNAM | OPT_PRIVFIX | OPT_NOARG | OPT_A2STRVAL | OPT_STATIC,
79 { "rp_pppoe_service", o_string, &pppd_pppoe_service,
80 "Desired PPPoE service name" },
81 { "rp_pppoe_ac", o_string, &acName,
82 "Desired PPPoE access concentrator name" },
83 { "rp_pppoe_sess", o_string, &existingSession,
84 "Attach to existing session (sessid:macaddr)" },
85 { "rp_pppoe_verbose", o_int, &printACNames,
86 "Be verbose about discovered access concentrators"},
87 { "pppoe-mac", o_string, &pppoe_reqd_mac,
88 "Only connect to specified MAC address" },
89 { "host-uniq", o_string, &host_uniq,
90 "Set the Host-Uniq to the supplied hex string" },
93 int (*OldDevnameHook)(char *cmd, char **argv, int doit) = NULL;
94 static PPPoEConnection *conn = NULL;
96 /**********************************************************************
97 * %FUNCTION: PPPOEInitDevice
103 * Initializes PPPoE device.
104 ***********************************************************************/
106 PPPOEInitDevice(void)
108 conn = malloc(sizeof(PPPoEConnection));
110 novm("PPPoE session data");
112 memset(conn, 0, sizeof(PPPoEConnection));
113 conn->ifName = devnam;
114 conn->discoverySocket = -1;
115 conn->sessionSocket = -1;
116 conn->printACNames = printACNames;
117 conn->discoveryTimeout = PADI_TIMEOUT;
121 /**********************************************************************
122 * %FUNCTION: PPPOEConnectDevice
126 * Non-negative if all goes well; -1 otherwise
128 * Connects PPPoE device.
129 ***********************************************************************/
131 PPPOEConnectDevice(void)
133 struct sockaddr_pppox sp;
137 /* Open session socket before discovery phase, to avoid losing session */
138 /* packets sent by peer just after PADS packet (noted on some Cisco */
139 /* server equipment). */
140 /* Opening this socket just before waitForPADS in the discovery() */
141 /* function would be more appropriate, but it would mess-up the code */
142 conn->sessionSocket = socket(AF_PPPOX, SOCK_STREAM, PX_PROTO_OE);
143 if (conn->sessionSocket < 0) {
144 error("Failed to create PPPoE socket: %m");
148 /* Restore configuration */
149 lcp_allowoptions[0].mru = conn->mtu;
150 lcp_wantoptions[0].mru = conn->mru;
152 /* Update maximum MRU */
153 s = socket(AF_INET, SOCK_DGRAM, 0);
155 error("Can't get MTU for %s: %m", conn->ifName);
158 strlcpy(ifr.ifr_name, conn->ifName, sizeof(ifr.ifr_name));
159 if (ioctl(s, SIOCGIFMTU, &ifr) < 0) {
160 error("Can't get MTU for %s: %m", conn->ifName);
166 if (lcp_allowoptions[0].mru > ifr.ifr_mtu - TOTAL_OVERHEAD)
167 lcp_allowoptions[0].mru = ifr.ifr_mtu - TOTAL_OVERHEAD;
168 if (lcp_wantoptions[0].mru > ifr.ifr_mtu - TOTAL_OVERHEAD)
169 lcp_wantoptions[0].mru = ifr.ifr_mtu - TOTAL_OVERHEAD;
172 if (!parseHostUniq(host_uniq, &conn->hostUniq))
173 fatal("Illegal value for host-uniq option");
175 /* if a custom host-uniq is not supplied, use our PID */
176 pid_t pid = getpid();
177 conn->hostUniq.type = htons(TAG_HOST_UNIQ);
178 conn->hostUniq.length = htons(sizeof(pid));
179 memcpy(conn->hostUniq.payload, &pid, sizeof(pid));
182 conn->acName = acName;
183 conn->serviceName = pppd_pppoe_service;
184 strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
185 if (existingSession) {
186 unsigned int mac[ETH_ALEN];
188 if (sscanf(existingSession, "%d:%x:%x:%x:%x:%x:%x",
189 &ses, &mac[0], &mac[1], &mac[2],
190 &mac[3], &mac[4], &mac[5]) != 7) {
191 fatal("Illegal value for rp_pppoe_sess option");
193 conn->session = htons(ses);
194 for (i=0; i<ETH_ALEN; i++) {
195 conn->peerEth[i] = (unsigned char) mac[i];
198 conn->discoverySocket =
199 openInterface(conn->ifName, Eth_PPPOE_Discovery, conn->myEth);
201 if (conn->discoveryState != STATE_SESSION) {
202 error("Unable to complete PPPoE Discovery");
207 /* Set PPPoE session-number for further consumption */
208 ppp_session_number = ntohs(conn->session);
210 sp.sa_family = AF_PPPOX;
211 sp.sa_protocol = PX_PROTO_OE;
212 sp.sa_addr.pppoe.sid = conn->session;
213 memcpy(sp.sa_addr.pppoe.dev, conn->ifName, IFNAMSIZ);
214 memcpy(sp.sa_addr.pppoe.remote, conn->peerEth, ETH_ALEN);
216 /* Set remote_number for ServPoET */
217 sprintf(remote_number, "%02X:%02X:%02X:%02X:%02X:%02X",
218 (unsigned) conn->peerEth[0],
219 (unsigned) conn->peerEth[1],
220 (unsigned) conn->peerEth[2],
221 (unsigned) conn->peerEth[3],
222 (unsigned) conn->peerEth[4],
223 (unsigned) conn->peerEth[5]);
225 warn("Connected to %02X:%02X:%02X:%02X:%02X:%02X via interface %s",
226 (unsigned) conn->peerEth[0],
227 (unsigned) conn->peerEth[1],
228 (unsigned) conn->peerEth[2],
229 (unsigned) conn->peerEth[3],
230 (unsigned) conn->peerEth[4],
231 (unsigned) conn->peerEth[5],
234 script_setenv("MACREMOTE", remote_number, 0);
236 if (connect(conn->sessionSocket, (struct sockaddr *) &sp,
237 sizeof(struct sockaddr_pppox)) < 0) {
238 error("Failed to connect PPPoE socket: %d %m", errno);
242 return conn->sessionSocket;
245 if (conn->discoverySocket >= 0) {
246 sendPADT(conn, NULL);
247 close(conn->discoverySocket);
248 conn->discoverySocket = -1;
250 close(conn->sessionSocket);
255 PPPOERecvConfig(int mru,
260 #if 0 /* broken protocol, but no point harrassing the users I guess... */
261 if (mru > MAX_PPPOE_MTU)
262 warn("Couldn't increase MRU to %d", mru);
266 /**********************************************************************
267 * %FUNCTION: PPPOEDisconnectDevice
273 * Disconnects PPPoE device
274 ***********************************************************************/
276 PPPOEDisconnectDevice(void)
278 struct sockaddr_pppox sp;
280 sp.sa_family = AF_PPPOX;
281 sp.sa_protocol = PX_PROTO_OE;
282 sp.sa_addr.pppoe.sid = 0;
283 memcpy(sp.sa_addr.pppoe.dev, conn->ifName, IFNAMSIZ);
284 memcpy(sp.sa_addr.pppoe.remote, conn->peerEth, ETH_ALEN);
285 if (connect(conn->sessionSocket, (struct sockaddr *) &sp,
286 sizeof(struct sockaddr_pppox)) < 0 && errno != EALREADY)
287 error("Failed to disconnect PPPoE socket: %d %m", errno);
288 close(conn->sessionSocket);
289 if (conn->discoverySocket >= 0) {
290 sendPADT(conn, NULL);
291 close(conn->discoverySocket);
296 PPPOEDeviceOptions(void)
299 snprintf(buf, 256, _PATH_ETHOPT "%s", devnam);
300 if (!options_from_file(buf, 0, 0, 1))
301 exit(EXIT_OPTION_ERROR);
305 struct channel pppoe_channel;
307 /**********************************************************************
308 * %FUNCTION: PPPoEDevnameHook
310 * cmd -- the command (actually, the device name
311 * argv -- argument vector
312 * doit -- if non-zero, set device name. Otherwise, just check if possible
314 * 1 if we will handle this device; 0 otherwise.
316 * Checks if name is a valid interface name; if so, returns 1. Also
317 * sets up devnam (string representation of device).
318 ***********************************************************************/
320 PPPoEDevnameHook(char *cmd, char **argv, int doit)
327 * Take any otherwise-unrecognized option as a possible device name,
328 * and test if it is the name of a network interface with a
329 * hardware address whose sa_family is ARPHRD_ETHER.
331 if (strlen(cmd) > 4 && !strncmp(cmd, "nic-", 4)) {
332 /* Strip off "nic-" */
337 if ((fd = socket(PF_PACKET, SOCK_RAW, 0)) < 0) {
341 /* Try getting interface index */
343 strlcpy(ifr.ifr_name, cmd, sizeof(ifr.ifr_name));
344 if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
347 if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
350 if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
352 error("Interface %s not Ethernet", cmd);
362 strlcpy(devnam, cmd, sizeof(devnam));
363 if (the_channel != &pppoe_channel) {
365 the_channel = &pppoe_channel;
376 /**********************************************************************
377 * %FUNCTION: plugin_init
383 * Initializes hooks for pppd plugin
384 ***********************************************************************/
388 if (!ppp_available() && !new_style_driver) {
389 fatal("Linux kernel does not support PPPoE -- are you running 2.4.x?");
392 add_options(Options);
394 info("RP-PPPoE plugin version %s compiled against pppd %s",
395 RP_VERSION, VERSION);
398 void pppoe_check_options(void)
403 if (pppoe_reqd_mac != NULL) {
404 if (sscanf(pppoe_reqd_mac, "%x:%x:%x:%x:%x:%x",
405 &mac[0], &mac[1], &mac[2], &mac[3],
406 &mac[4], &mac[5]) != 6) {
407 option_error("cannot parse pppoe-mac option value");
408 exit(EXIT_OPTION_ERROR);
410 for (i = 0; i < 6; ++i)
411 conn->req_peer_mac[i] = mac[i];
415 lcp_allowoptions[0].neg_accompression = 0;
416 lcp_wantoptions[0].neg_accompression = 0;
418 lcp_allowoptions[0].neg_asyncmap = 0;
419 lcp_wantoptions[0].neg_asyncmap = 0;
421 lcp_allowoptions[0].neg_pcompression = 0;
422 lcp_wantoptions[0].neg_pcompression = 0;
424 if (lcp_allowoptions[0].mru > MAX_PPPOE_MTU)
425 lcp_allowoptions[0].mru = MAX_PPPOE_MTU;
426 if (lcp_wantoptions[0].mru > MAX_PPPOE_MTU)
427 lcp_wantoptions[0].mru = MAX_PPPOE_MTU;
429 /* Save configuration */
430 conn->mtu = lcp_allowoptions[0].mru;
431 conn->mru = lcp_wantoptions[0].mru;
433 ccp_allowoptions[0].deflate = 0;
434 ccp_wantoptions[0].deflate = 0;
436 ipcp_allowoptions[0].neg_vj = 0;
437 ipcp_wantoptions[0].neg_vj = 0;
439 ccp_allowoptions[0].bsd_compress = 0;
440 ccp_wantoptions[0].bsd_compress = 0;
443 struct channel pppoe_channel = {
445 .process_extra_options = &PPPOEDeviceOptions,
446 .check_options = pppoe_check_options,
447 .connect = &PPPOEConnectDevice,
448 .disconnect = &PPPOEDisconnectDevice,
449 .establish_ppp = &generic_establish_ppp,
450 .disestablish_ppp = &generic_disestablish_ppp,
452 .recv_config = &PPPOERecvConfig,