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.
21 #include <linux/atmdev.h>
22 #include <linux/atmppp.h>
25 #include <sys/ioctl.h>
26 #include <sys/param.h>
28 #include <pppd/pppd.h>
29 #include <pppd/pathnames.h>
30 #include <pppd/fsm.h> /* Needed for lcp.h to include cleanly */
34 const char pppd_version[] = PPPD_VERSION;
36 static struct sockaddr_atmpvc pvcaddr;
37 static char *qosstr = NULL;
38 static bool llc_encaps = 0;
39 static bool vc_encaps = 0;
40 static int device_got_set = 0;
41 static int pppoatm_max_mtu, pppoatm_max_mru;
42 static int setdevname_pppoatm(const char *cp, const char **argv, int doit);
43 struct channel pppoa_channel;
44 static int pppoa_fd = -1;
46 static option_t pppoa_options[] = {
47 { "device name", o_wild, (void *) &setdevname_pppoatm,
48 "ATM service provider IDs: VPI.VCI",
49 OPT_DEVNAM | OPT_PRIVFIX | OPT_NOARG | OPT_A2STRVAL | OPT_STATIC,
51 { "llc-encaps", o_bool, &llc_encaps,
52 "use LLC encapsulation for PPPoATM", 1},
53 { "vc-encaps", o_bool, &vc_encaps,
54 "use VC multiplexing for PPPoATM (default)", 1},
55 { "qos", o_string, &qosstr,
56 "set QoS for PPPoATM connection", 1},
61 * -1 if there's a problem with setting the device
62 * 0 if we can't parse "cp" as a valid name of a device
63 * 1 if "cp" is a reasonable thing to name a device
64 * Note that we don't actually open the device at this point
65 * We do need to fill in:
66 * devnam: a string representation of the device
67 * devstat: a stat structure of the device. In this case
68 * we're not opening a device, so we just make sure
69 * to set up S_ISCHR(devstat.st_mode) != 1, so we
70 * don't get confused that we're on stdin.
72 int (*old_setdevname_hook)(const char* cp) = NULL;
73 static int setdevname_pppoatm(const char *cp, const char **argv, int doit)
75 struct sockaddr_atmpvc addr;
76 extern struct stat devstat;
81 memset(&addr, 0, sizeof addr);
82 if (text2atm(cp, (struct sockaddr *) &addr, sizeof(addr),
83 T2A_PVC | T2A_NAME | T2A_WILDCARD) < 0) {
85 info("cannot parse the ATM address: %s", cp);
91 memcpy(&pvcaddr, &addr, sizeof pvcaddr);
92 strlcpy(devnam, cp, MAXPATHLEN);
93 devstat.st_mode = S_IFSOCK;
94 if (the_channel != &pppoa_channel) {
95 the_channel = &pppoa_channel;
96 lcp_wantoptions[0].neg_accompression = 0;
97 lcp_allowoptions[0].neg_accompression = 0;
98 lcp_wantoptions[0].neg_asyncmap = 0;
99 lcp_allowoptions[0].neg_asyncmap = 0;
100 lcp_wantoptions[0].neg_pcompression = 0;
106 #define pppoatm_overhead() (llc_encaps ? 6 : 2)
108 static void no_device_given_pppoatm(void)
110 fatal("No vpi.vci specified");
113 static void set_line_discipline_pppoatm(int fd)
115 struct atm_backend_ppp be;
117 be.backend_num = ATM_BACKEND_PPP;
119 be.encaps = PPPOATM_ENCAPS_VC;
121 be.encaps = PPPOATM_ENCAPS_LLC;
123 be.encaps = PPPOATM_ENCAPS_AUTODETECT;
125 if (ioctl(fd, ATM_SETBACKEND, &be) < 0)
126 fatal("ioctl(ATM_SETBACKEND): %m");
130 static void reset_line_discipline_pppoatm(int fd)
132 atm_backend_t be = ATM_BACKEND_RAW;
133 /* 2.4 doesn't support this yet */
134 (void) ioctl(fd, ATM_SETBACKEND, &be);
138 static int connect_pppoatm(void)
144 no_device_given_pppoatm();
145 fd = socket(AF_ATMPVC, SOCK_DGRAM, 0);
147 fatal("failed to create socket: %m");
148 memset(&qos, 0, sizeof qos);
149 qos.txtp.traffic_class = qos.rxtp.traffic_class = ATM_UBR;
150 /* TODO: support simplified QoS setting */
152 if (text2qos(qosstr, &qos, 0))
153 fatal("Can't parse QoS: \"%s\"");
154 qos.txtp.max_sdu = lcp_allowoptions[0].mru + pppoatm_overhead();
155 qos.rxtp.max_sdu = lcp_wantoptions[0].mru + pppoatm_overhead();
157 if (setsockopt(fd, SOL_ATM, SO_ATMQOS, &qos, sizeof(qos)) < 0)
158 fatal("setsockopt(SO_ATMQOS): %m");
159 /* TODO: accept on SVCs... */
160 if (connect(fd, (struct sockaddr *) &pvcaddr,
161 sizeof(struct sockaddr_atmpvc)))
162 fatal("connect(%s): %m", devnam);
163 pppoatm_max_mtu = lcp_allowoptions[0].mru;
164 pppoatm_max_mru = lcp_wantoptions[0].mru;
165 set_line_discipline_pppoatm(fd);
166 strlcpy(ppp_devnam, devnam, MAXPATHLEN);
171 static void disconnect_pppoatm(void)
176 void plugin_init(void)
179 extern int new_style_driver; /* From sys-linux.c */
180 if (!ppp_available() && !new_style_driver)
181 fatal("Kernel doesn't support ppp_generic - "
182 "needed for PPPoATM");
184 fatal("No PPPoATM support on this OS");
186 add_options(pppoa_options);
189 struct channel pppoa_channel = {
190 .options = pppoa_options,
191 .process_extra_options = NULL,
192 .check_options = NULL,
193 .connect = &connect_pppoatm,
194 .disconnect = &disconnect_pppoatm,
195 .establish_ppp = &generic_establish_ppp,
196 .disestablish_ppp = &generic_disestablish_ppp,