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>
27 #include <pppd/pppd.h>
28 #include <pppd/pathnames.h>
29 #include <pppd/fsm.h> /* Needed for lcp.h to include cleanly */
33 const char pppd_version[] = PPPD_VERSION;
35 static struct sockaddr_atmpvc pvcaddr;
36 static char *qosstr = NULL;
37 static bool llc_encaps = 0;
38 static bool vc_encaps = 0;
39 static int device_got_set = 0;
40 static int pppoatm_max_mtu, pppoatm_max_mru;
41 static int setdevname_pppoatm(const char *cp, const char **argv, int doit);
42 struct channel pppoa_channel;
43 static int pppoa_fd = -1;
45 static option_t pppoa_options[] = {
46 { "device name", o_wild, (void *) &setdevname_pppoatm,
47 "ATM service provider IDs: VPI.VCI",
48 OPT_DEVNAM | OPT_PRIVFIX | OPT_NOARG | OPT_A2STRVAL | OPT_STATIC,
50 { "llc-encaps", o_bool, &llc_encaps,
51 "use LLC encapsulation for PPPoATM", 1},
52 { "vc-encaps", o_bool, &vc_encaps,
53 "use VC multiplexing for PPPoATM (default)", 1},
54 { "qos", o_string, &qosstr,
55 "set QoS for PPPoATM connection", 1},
60 * -1 if there's a problem with setting the device
61 * 0 if we can't parse "cp" as a valid name of a device
62 * 1 if "cp" is a reasonable thing to name a device
63 * Note that we don't actually open the device at this point
64 * We do need to fill in:
65 * devnam: a string representation of the device
66 * devstat: a stat structure of the device. In this case
67 * we're not opening a device, so we just make sure
68 * to set up S_ISCHR(devstat.st_mode) != 1, so we
69 * don't get confused that we're on stdin.
71 int (*old_setdevname_hook)(const char* cp) = NULL;
72 static int setdevname_pppoatm(const char *cp, const char **argv, int doit)
74 struct sockaddr_atmpvc addr;
75 extern struct stat devstat;
80 memset(&addr, 0, sizeof addr);
81 if (text2atm(cp, (struct sockaddr *) &addr, sizeof(addr),
82 T2A_PVC | T2A_NAME | T2A_WILDCARD) < 0) {
84 info("cannot parse the ATM address: %s", cp);
90 memcpy(&pvcaddr, &addr, sizeof pvcaddr);
91 strlcpy(devnam, cp, sizeof devnam);
92 devstat.st_mode = S_IFSOCK;
93 if (the_channel != &pppoa_channel) {
94 the_channel = &pppoa_channel;
95 lcp_wantoptions[0].neg_accompression = 0;
96 lcp_allowoptions[0].neg_accompression = 0;
97 lcp_wantoptions[0].neg_asyncmap = 0;
98 lcp_allowoptions[0].neg_asyncmap = 0;
99 lcp_wantoptions[0].neg_pcompression = 0;
105 #define pppoatm_overhead() (llc_encaps ? 6 : 2)
107 static void no_device_given_pppoatm(void)
109 fatal("No vpi.vci specified");
112 static void set_line_discipline_pppoatm(int fd)
114 struct atm_backend_ppp be;
116 be.backend_num = ATM_BACKEND_PPP;
118 be.encaps = PPPOATM_ENCAPS_VC;
120 be.encaps = PPPOATM_ENCAPS_LLC;
122 be.encaps = PPPOATM_ENCAPS_AUTODETECT;
124 if (ioctl(fd, ATM_SETBACKEND, &be) < 0)
125 fatal("ioctl(ATM_SETBACKEND): %m");
129 static void reset_line_discipline_pppoatm(int fd)
131 atm_backend_t be = ATM_BACKEND_RAW;
132 /* 2.4 doesn't support this yet */
133 (void) ioctl(fd, ATM_SETBACKEND, &be);
137 static int connect_pppoatm(void)
143 no_device_given_pppoatm();
144 fd = socket(AF_ATMPVC, SOCK_DGRAM, 0);
146 fatal("failed to create socket: %m");
147 memset(&qos, 0, sizeof qos);
148 qos.txtp.traffic_class = qos.rxtp.traffic_class = ATM_UBR;
149 /* TODO: support simplified QoS setting */
151 if (text2qos(qosstr, &qos, 0))
152 fatal("Can't parse QoS: \"%s\"");
153 qos.txtp.max_sdu = lcp_allowoptions[0].mru + pppoatm_overhead();
154 qos.rxtp.max_sdu = lcp_wantoptions[0].mru + pppoatm_overhead();
156 if (setsockopt(fd, SOL_ATM, SO_ATMQOS, &qos, sizeof(qos)) < 0)
157 fatal("setsockopt(SO_ATMQOS): %m");
158 /* TODO: accept on SVCs... */
159 if (connect(fd, (struct sockaddr *) &pvcaddr,
160 sizeof(struct sockaddr_atmpvc)))
161 fatal("connect(%s): %m", devnam);
162 pppoatm_max_mtu = lcp_allowoptions[0].mru;
163 pppoatm_max_mru = lcp_wantoptions[0].mru;
164 set_line_discipline_pppoatm(fd);
165 strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
170 static void disconnect_pppoatm(void)
175 void plugin_init(void)
178 extern int new_style_driver; /* From sys-linux.c */
179 if (!ppp_available() && !new_style_driver)
180 fatal("Kernel doesn't support ppp_generic - "
181 "needed for PPPoATM");
183 fatal("No PPPoATM support on this OS");
185 add_options(pppoa_options);
188 struct channel pppoa_channel = {
189 .options = pppoa_options,
190 .process_extra_options = NULL,
191 .check_options = NULL,
192 .connect = &connect_pppoatm,
193 .disconnect = &disconnect_pppoatm,
194 .establish_ppp = &generic_establish_ppp,
195 .disestablish_ppp = &generic_disestablish_ppp,