2 * multilink.c - support routines for multilink.
4 * Copyright (c) 2000-2002 Paul Mackerras. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. The name(s) of the authors of this software must not be used to
14 * endorse or promote products derived from this software without
15 * prior written permission.
17 * 3. Redistributions of any form whatsoever must retain the following
19 * "This product includes software developed by Paul Mackerras
20 * <paulus@samba.org>".
22 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
31 #include "netif/ppp/ppp_opts.h"
32 #if PPP_SUPPORT && defined(HAVE_MULTILINK) /* don't build if not configured for use in lwipopts.h */
36 * Multilink uses Samba TDB (Trivial Database Library), which
37 * we cannot port, because it needs a filesystem.
39 * We have to choose between doing a memory-shared TDB-clone,
40 * or dropping multilink support at all.
49 #include <netinet/in.h>
52 #include "netif/ppp/ppp_impl.h"
54 #include "netif/ppp/fsm.h"
55 #include "netif/ppp/lcp.h"
56 #include "netif/ppp/tdb.h"
58 bool endpoint_specified; /* user gave explicit endpoint discriminator */
59 char *bundle_id; /* identifier for our bundle */
60 char *blinks_id; /* key for the list of links */
61 bool doing_multilink; /* multilink was enabled and agreed to */
62 bool multilink_master; /* we own the multilink bundle */
64 extern TDB_CONTEXT *pppdb;
67 static void make_bundle_links (int append);
68 static void remove_bundle_link (void);
69 static void iterate_bundle_links (void (*func) (char *));
71 static int get_default_epdisc (struct epdisc *);
72 static int parse_num (char *str, const char *key, int *valp);
73 static int owns_unit (TDB_DATA pid, int unit);
75 #define set_ip_epdisc(ep, addr) do { \
77 ep->value[0] = addr >> 24; \
78 ep->value[1] = addr >> 16; \
79 ep->value[2] = addr >> 8; \
80 ep->value[3] = addr; \
83 #define LOCAL_IP_ADDR(addr) \
84 (((addr) & 0xff000000) == 0x0a000000 /* 10.x.x.x */ \
85 || ((addr) & 0xfff00000) == 0xac100000 /* 172.16.x.x */ \
86 || ((addr) & 0xffff0000) == 0xc0a80000) /* 192.168.x.x */
88 #define process_exists(n) (kill((n), 0) == 0 || errno != ESRCH)
93 lcp_options *wo = &lcp_wantoptions[0];
94 lcp_options *ao = &lcp_allowoptions[0];
99 /* if we're doing multilink, we have to negotiate MRRU */
101 /* mrru not specified, default to mru */
108 if (!wo->neg_endpoint && !noendpoint) {
109 /* get a default endpoint value */
110 wo->neg_endpoint = get_default_epdisc(&wo->endpoint);
115 * Make a new bundle or join us to an existing bundle
116 * if we are doing multilink.
121 lcp_options *go = &lcp_gotoptions[0];
122 lcp_options *ho = &lcp_hisoptions[0];
123 lcp_options *ao = &lcp_allowoptions[0];
127 TDB_DATA key, pid, rec;
129 if (doing_multilink) {
130 /* have previously joined a bundle */
131 if (!go->neg_mrru || !ho->neg_mrru) {
132 notice("oops, didn't get multilink on renegotiation");
133 lcp_close(pcb, "multilink required");
136 /* XXX should check the peer_authname and ho->endpoint
137 are the same as previously */
141 if (!go->neg_mrru || !ho->neg_mrru) {
142 /* not doing multilink */
144 notice("oops, multilink negotiated only for receive");
145 mtu = ho->neg_mru? ho->mru: PPP_MRU;
149 /* already have a bundle */
150 cfg_bundle(0, 0, 0, 0);
151 netif_set_mtu(pcb, mtu);
154 make_new_bundle(0, 0, 0, 0);
156 netif_set_mtu(pcb, mtu);
163 * Find the appropriate bundle or join a new one.
164 * First we make up a name for the bundle.
165 * The length estimate is worst-case assuming every
166 * character has to be quoted.
168 l = 4 * strlen(peer_authname) + 10;
169 if (ho->neg_endpoint)
170 l += 3 * ho->endpoint.length + 8;
172 l += 3 * strlen(bundle_name) + 2;
173 bundle_id = malloc(l);
175 novm("bundle identifier");
178 p += slprintf(p, l-1, "BUNDLE=\"%q\"", peer_authname);
179 if (ho->neg_endpoint || bundle_name)
181 if (ho->neg_endpoint)
182 p += slprintf(p, bundle_id+l-p, "%s",
183 epdisc_to_str(&ho->endpoint));
185 p += slprintf(p, bundle_id+l-p, "/%v", bundle_name);
187 /* Make the key for the list of links belonging to the bundle */
189 blinks_id = malloc(l + 7);
190 if (blinks_id == NULL)
191 novm("bundle links key");
192 slprintf(blinks_id, l + 7, "BUNDLE_LINKS=%s", bundle_id + 7);
195 * For demand mode, we only need to configure the bundle
196 * and attach the link.
198 mtu = LWIP_MIN(ho->mrru, ao->mru);
200 cfg_bundle(go->mrru, ho->mrru, go->neg_ssnhf, ho->neg_ssnhf);
201 netif_set_mtu(pcb, mtu);
202 script_setenv("BUNDLE", bundle_id + 7, 1);
207 * Check if the bundle ID is already in the database.
211 key.dptr = bundle_id;
212 key.dsize = p - bundle_id;
213 pid = tdb_fetch(pppdb, key);
214 if (pid.dptr != NULL) {
215 /* bundle ID exists, see if the pppd record exists */
216 rec = tdb_fetch(pppdb, pid);
217 if (rec.dptr != NULL && rec.dsize > 0) {
218 /* make sure the string is null-terminated */
219 rec.dptr[rec.dsize-1] = 0;
220 /* parse the interface number */
221 parse_num(rec.dptr, "IFNAME=ppp", &unit);
222 /* check the pid value */
223 if (!parse_num(rec.dptr, "PPPD_PID=", &pppd_pid)
224 || !process_exists(pppd_pid)
225 || !owns_unit(pid, unit))
233 /* attach to existing unit */
234 if (bundle_attach(unit)) {
236 script_setenv("BUNDLE", bundle_id + 7, 0);
237 make_bundle_links(1);
239 info("Link attached to %s", ifname);
242 /* attach failed because bundle doesn't exist */
245 /* we have to make a new bundle */
246 make_new_bundle(go->mrru, ho->mrru, go->neg_ssnhf, ho->neg_ssnhf);
248 netif_set_mtu(pcb, mtu);
249 script_setenv("BUNDLE", bundle_id + 7, 1);
250 make_bundle_links(pcb);
252 info("New bundle %s created", ifname);
253 multilink_master = 1;
257 void mp_exit_bundle()
260 remove_bundle_link();
264 static void sendhup(char *str)
268 if (parse_num(str, "PPPD_PID=", &pid) && pid != getpid()) {
270 dbglog("sending SIGHUP to process %d", pid);
275 void mp_bundle_terminated()
279 bundle_terminating = 1;
280 upper_layers_down(pcb);
281 notice("Connection terminated.");
282 #if PPP_STATS_SUPPORT
284 #endif /* PPP_STATS_SUPPORT */
287 script_unsetenv("IFNAME");
292 iterate_bundle_links(sendhup);
293 key.dptr = blinks_id;
294 key.dsize = strlen(blinks_id);
295 tdb_delete(pppdb, key);
298 new_phase(PPP_PHASE_DEAD);
301 multilink_master = 0;
304 static void make_bundle_links(int append)
311 key.dptr = blinks_id;
312 key.dsize = strlen(blinks_id);
313 slprintf(entry, sizeof(entry), "%s;", db_key);
316 rec = tdb_fetch(pppdb, key);
317 if (rec.dptr != NULL && rec.dsize > 0) {
318 rec.dptr[rec.dsize-1] = 0;
319 if (strstr(rec.dptr, db_key) != NULL) {
320 /* already in there? strange */
321 warn("link entry already exists in tdb");
324 l = rec.dsize + strlen(entry);
327 novm("bundle link list");
328 slprintf(p, l, "%s%s", rec.dptr, entry);
330 warn("bundle link list not found");
332 if (rec.dptr != NULL)
336 rec.dsize = strlen(p) + 1;
337 if (tdb_store(pppdb, key, rec, TDB_REPLACE))
338 error("couldn't %s bundle link list",
339 append? "update": "create");
344 static void remove_bundle_link()
351 key.dptr = blinks_id;
352 key.dsize = strlen(blinks_id);
353 slprintf(entry, sizeof(entry), "%s;", db_key);
355 rec = tdb_fetch(pppdb, key);
356 if (rec.dptr == NULL || rec.dsize <= 0) {
357 if (rec.dptr != NULL)
361 rec.dptr[rec.dsize-1] = 0;
362 p = strstr(rec.dptr, entry);
364 q = p + strlen(entry);
367 rec.dsize = p - rec.dptr + l;
368 if (tdb_store(pppdb, key, rec, TDB_REPLACE))
369 error("couldn't update bundle link list (removal)");
374 static void iterate_bundle_links(void (*func)(char *))
376 TDB_DATA key, rec, pp;
379 key.dptr = blinks_id;
380 key.dsize = strlen(blinks_id);
381 rec = tdb_fetch(pppdb, key);
382 if (rec.dptr == NULL || rec.dsize <= 0) {
383 error("bundle link list not found (iterating list)");
384 if (rec.dptr != NULL)
390 while ((q = strchr(p, ';')) != NULL) {
394 pp = tdb_fetch(pppdb, key);
395 if (pp.dptr != NULL && pp.dsize > 0) {
396 pp.dptr[pp.dsize-1] = 0;
407 parse_num(str, key, valp)
415 p = strstr(str, key);
418 i = strtol(p, &endp, 10);
419 if (endp != p && (*endp == 0 || *endp == ';')) {
428 * Check whether the pppd identified by `key' still owns ppp unit `unit'.
439 slprintf(ifkey, sizeof(ifkey), "IFNAME=ppp%d", unit);
441 kd.dsize = strlen(ifkey);
442 vd = tdb_fetch(pppdb, kd);
443 if (vd.dptr != NULL) {
444 ret = vd.dsize == key.dsize
445 && memcmp(vd.dptr, key.dptr, vd.dsize) == 0;
452 get_default_epdisc(ep)
459 /* First try for an ethernet MAC address */
460 p = get_first_ethernet();
461 if (p != 0 && get_if_hwaddr(ep->value, p) >= 0) {
467 /* see if our hostname corresponds to a reasonable IP address */
468 hp = gethostbyname(hostname);
470 addr = *(u32_t *)hp->h_addr;
471 if (!bad_ip_adrs(addr)) {
472 addr = lwip_ntohl(addr);
473 if (!LOCAL_IP_ADDR(addr)) {
475 set_ip_epdisc(ep, addr);
485 * epdisc_to_str - make a printable string from an endpoint discriminator.
488 static char *endp_class_names[] = {
489 "null", "local", "IP", "MAC", "magic", "phone"
496 static char str[MAX_ENDP_LEN*3+8];
497 u_char *p = ep->value;
501 if (ep->class == EPD_NULL && ep->length == 0)
503 if (ep->class == EPD_IP && ep->length == 4) {
507 slprintf(str, sizeof(str), "IP:%I", lwip_htonl(addr));
513 if (ep->class == EPD_MAC && ep->length == 6)
515 else if (ep->class == EPD_MAGIC && (ep->length % 4) == 0)
518 if (ep->class <= EPD_PHONENUM)
519 q += slprintf(q, sizeof(str)-1, "%s",
520 endp_class_names[ep->class]);
522 q += slprintf(q, sizeof(str)-1, "%d", ep->class);
524 for (i = 0; i < ep->length && i < MAX_ENDP_LEN; ++i) {
525 if ((i & mask) == 0) {
529 q += slprintf(q, str + sizeof(str) - q, "%.2x", ep->value[i]);
534 static int hexc_val(int c)
544 str_to_epdisc(ep, str)
551 for (i = EPD_NULL; i <= EPD_PHONENUM; ++i) {
552 int sl = strlen(endp_class_names[i]);
553 if (strncasecmp(str, endp_class_names[i], sl) == 0) {
558 if (i > EPD_PHONENUM) {
559 /* not a class name, try a decimal class number */
560 i = strtol(str, &endp, 10);
562 return 0; /* can't parse class number */
570 if (*str != ':' && *str != '.')
576 i = parse_dotted_ip(str, &addr);
577 if (i == 0 || str[i] != 0)
579 set_ip_epdisc(ep, addr);
582 if (i == EPD_MAC && get_if_hwaddr(ep->value, str) >= 0) {
588 for (l = 0; l < MAX_ENDP_LEN; ++l) {
592 for (p = str; isxdigit(*p); ++p)
597 ep->value[l] = hexc_val(*str++);
599 ep->value[l] = (ep->value[l] << 4) + hexc_val(*str++);
600 if (*str == ':' || *str == '.')
603 if (*str != 0 || (ep->class == EPD_MAC && l != 6))
609 #endif /* PPP_SUPPORT && HAVE_MULTILINK */