1 /* pppoatm.c - pppd plugin to implement PPPoATM protocol.
3 * Copyright 2000 Mitchell Blank Jr.
4 * Based in part on work from Jens Axboe and Paul Mackerras.
5 * Updated to ppp-2.4.1 by Bernhard Kaindl
7 * Updated to ppp-2.4.2 by David Woodhouse 2004.
8 * - disconnect method added
9 * - remove_options() abuse removed.
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
20 #include "pathnames.h"
21 #include "fsm.h" /* Needed for lcp.h to include cleanly */
24 #include <linux/atmdev.h>
25 #include <linux/atmppp.h>
28 #include <sys/ioctl.h>
30 const char pppd_version[] = VERSION;
32 static struct sockaddr_atmpvc pvcaddr;
33 static char *qosstr = NULL;
34 static bool llc_encaps = 0;
35 static bool vc_encaps = 0;
36 static int device_got_set = 0;
37 static int pppoatm_max_mtu, pppoatm_max_mru;
38 static int setdevname_pppoatm(const char *cp, const char **argv, int doit);
39 struct channel pppoa_channel;
40 static int pppoa_fd = -1;
42 static option_t pppoa_options[] = {
43 { "device name", o_wild, (void *) &setdevname_pppoatm,
44 "ATM service provider IDs: VPI.VCI",
45 OPT_DEVNAM | OPT_PRIVFIX | OPT_NOARG | OPT_A2STRVAL | OPT_STATIC,
47 { "llc-encaps", o_bool, &llc_encaps,
48 "use LLC encapsulation for PPPoATM", 1},
49 { "vc-encaps", o_bool, &vc_encaps,
50 "use VC multiplexing for PPPoATM (default)", 1},
51 { "qos", o_string, &qosstr,
52 "set QoS for PPPoATM connection", 1},
57 * -1 if there's a problem with setting the device
58 * 0 if we can't parse "cp" as a valid name of a device
59 * 1 if "cp" is a reasonable thing to name a device
60 * Note that we don't actually open the device at this point
61 * We do need to fill in:
62 * devnam: a string representation of the device
63 * devstat: a stat structure of the device. In this case
64 * we're not opening a device, so we just make sure
65 * to set up S_ISCHR(devstat.st_mode) != 1, so we
66 * don't get confused that we're on stdin.
68 int (*old_setdevname_hook)(const char* cp) = NULL;
69 static int setdevname_pppoatm(const char *cp, const char **argv, int doit)
71 struct sockaddr_atmpvc addr;
72 extern struct stat devstat;
75 //info("PPPoATM setdevname_pppoatm: '%s'", cp);
76 memset(&addr, 0, sizeof addr);
77 if (text2atm(cp, (struct sockaddr *) &addr, sizeof(addr),
78 T2A_PVC | T2A_NAME) < 0) {
80 info("atm does not recognize: %s", cp);
84 //if (!dev_set_ok()) return -1;
85 memcpy(&pvcaddr, &addr, sizeof pvcaddr);
86 strlcpy(devnam, cp, sizeof devnam);
87 devstat.st_mode = S_IFSOCK;
88 if (the_channel != &pppoa_channel) {
89 the_channel = &pppoa_channel;
90 lcp_wantoptions[0].neg_accompression = 0;
91 lcp_allowoptions[0].neg_accompression = 0;
92 lcp_wantoptions[0].neg_asyncmap = 0;
93 lcp_allowoptions[0].neg_asyncmap = 0;
94 lcp_wantoptions[0].neg_pcompression = 0;
96 info("PPPoATM setdevname_pppoatm - SUCCESS:%s", cp);
101 #define pppoatm_overhead() (llc_encaps ? 6 : 2)
103 static void no_device_given_pppoatm(void)
105 fatal("No vpi.vci specified");
108 static void set_line_discipline_pppoatm(int fd)
110 struct atm_backend_ppp be;
111 be.backend_num = ATM_BACKEND_PPP;
113 be.encaps = PPPOATM_ENCAPS_VC;
115 be.encaps = PPPOATM_ENCAPS_LLC;
117 be.encaps = PPPOATM_ENCAPS_AUTODETECT;
118 if (ioctl(fd, ATM_SETBACKEND, &be) < 0)
119 fatal("ioctl(ATM_SETBACKEND): %m");
123 static void reset_line_discipline_pppoatm(int fd)
125 atm_backend_t be = ATM_BACKEND_RAW;
126 /* 2.4 doesn't support this yet */
127 (void) ioctl(fd, ATM_SETBACKEND, &be);
131 static int connect_pppoatm(void)
136 system ("/sbin/modprobe -q pppoatm");
139 no_device_given_pppoatm();
140 fd = socket(AF_ATMPVC, SOCK_DGRAM, 0);
142 fatal("failed to create socket: %m");
143 memset(&qos, 0, sizeof qos);
144 qos.txtp.traffic_class = qos.rxtp.traffic_class = ATM_UBR;
145 /* TODO: support simplified QoS setting */
147 if (text2qos(qosstr, &qos, 0))
148 fatal("Can't parse QoS: \"%s\"");
149 qos.txtp.max_sdu = lcp_allowoptions[0].mru + pppoatm_overhead();
150 qos.rxtp.max_sdu = lcp_wantoptions[0].mru + pppoatm_overhead();
152 if (setsockopt(fd, SOL_ATM, SO_ATMQOS, &qos, sizeof(qos)) < 0)
153 fatal("setsockopt(SO_ATMQOS): %m");
154 /* TODO: accept on SVCs... */
155 if (connect(fd, (struct sockaddr *) &pvcaddr,
156 sizeof(struct sockaddr_atmpvc)))
157 fatal("connect(%s): %m", devnam);
158 pppoatm_max_mtu = lcp_allowoptions[0].mru;
159 pppoatm_max_mru = lcp_wantoptions[0].mru;
160 set_line_discipline_pppoatm(fd);
161 strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
166 static void disconnect_pppoatm(void)
171 static void send_config_pppoa(int mtu,
178 if (mtu > pppoatm_max_mtu)
179 error("Couldn't increase MTU to %d", mtu);
180 sock = socket(AF_INET, SOCK_DGRAM, 0);
182 fatal("Couldn't create IP socket: %m");
183 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
185 if (ioctl(sock, SIOCSIFMTU, (caddr_t) &ifr) < 0)
186 fatal("ioctl(SIOCSIFMTU): %m");
190 static void recv_config_pppoa(int mru,
195 if (mru > pppoatm_max_mru)
196 error("Couldn't increase MRU to %d", mru);
199 void plugin_init(void)
201 #if defined(__linux__)
202 extern int new_style_driver; /* From sys-linux.c */
203 if (!ppp_available() && !new_style_driver)
204 fatal("Kernel doesn't support ppp_generic - "
205 "needed for PPPoATM");
207 fatal("No PPPoATM support on this OS");
209 info("PPPoATM plugin_init");
210 add_options(pppoa_options);
212 struct channel pppoa_channel = {
213 options: pppoa_options,
214 process_extra_options: NULL,
216 connect: &connect_pppoatm,
217 disconnect: &disconnect_pppoatm,
218 establish_ppp: &generic_establish_ppp,
219 disestablish_ppp: &generic_disestablish_ppp,
220 send_config: &send_config_pppoa,
221 recv_config: &recv_config_pppoa,