2 * ipcp.c - PPP IP Control Protocol.
4 * Copyright (c) 1984-2000 Carnegie Mellon University. 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. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name "Carnegie Mellon University" must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission. For permission or any legal
21 * details, please contact
22 * Office of Technology Transfer
23 * Carnegie Mellon University
25 * Pittsburgh, PA 15213-3890
26 * (412) 268-4387, fax: (412) 268-7395
27 * tech-transfer@andrew.cmu.edu
29 * 4. Redistributions of any form whatsoever must retain the following
31 * "This product includes software developed by Computing Services
32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
35 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
36 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
37 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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39 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
40 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
43 #define RCSID "$Id: ipcp.c,v 1.73 2008/05/26 08:33:22 paulus Exp $"
53 #include <sys/param.h>
54 #include <sys/types.h>
55 #include <sys/socket.h>
56 #include <netinet/in.h>
57 #include <arpa/inet.h>
62 #include "pathnames.h"
64 static const char rcsid[] = RCSID;
67 ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */
68 ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
69 ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
70 ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
72 u_int32_t netmask = 0; /* IP netmask to set on interface */
74 bool disable_defaultip = 0; /* Don't use hostname for default IP adrs */
75 bool noremoteip = 0; /* Let him have no IP address */
77 /* Hook for a plugin to know when IP protocol has come up */
78 void (*ip_up_hook) __P((void)) = NULL;
80 /* Hook for a plugin to know when IP protocol has come down */
81 void (*ip_down_hook) __P((void)) = NULL;
83 /* Hook for a plugin to choose the remote IP address */
84 void (*ip_choose_hook) __P((u_int32_t *)) = NULL;
86 /* Notifiers for when IPCP goes up and down */
87 struct notifier *ip_up_notifier = NULL;
88 struct notifier *ip_down_notifier = NULL;
91 static int default_route_set[NUM_PPP]; /* Have set up a default route */
92 static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */
93 static bool usepeerdns; /* Ask peer for DNS addrs */
94 static int ipcp_is_up; /* have called np_up() */
95 static int ipcp_is_open; /* haven't called np_finished() */
96 static bool ask_for_local; /* request our address from peer */
97 static char vj_value[8]; /* string form of vj option value */
98 static char netmask_str[20]; /* string form of netmask value */
101 * Callbacks for fsm code. (CI = Configuration Information)
103 static void ipcp_resetci __P((fsm *)); /* Reset our CI */
104 static int ipcp_cilen __P((fsm *)); /* Return length of our CI */
105 static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
106 static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
107 static int ipcp_nakci __P((fsm *, u_char *, int, int));/* Peer nak'd our CI */
108 static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
109 static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
110 static void ipcp_up __P((fsm *)); /* We're UP */
111 static void ipcp_down __P((fsm *)); /* We're DOWN */
112 static void ipcp_finished __P((fsm *)); /* Don't need lower layer */
114 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
116 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
117 ipcp_resetci, /* Reset our Configuration Information */
118 ipcp_cilen, /* Length of our Configuration Information */
119 ipcp_addci, /* Add our Configuration Information */
120 ipcp_ackci, /* ACK our Configuration Information */
121 ipcp_nakci, /* NAK our Configuration Information */
122 ipcp_rejci, /* Reject our Configuration Information */
123 ipcp_reqci, /* Request peer's Configuration Information */
124 ipcp_up, /* Called when fsm reaches OPENED state */
125 ipcp_down, /* Called when fsm leaves OPENED state */
126 NULL, /* Called when we want the lower layer up */
127 ipcp_finished, /* Called when we want the lower layer down */
128 NULL, /* Called when Protocol-Reject received */
129 NULL, /* Retransmission is necessary */
130 NULL, /* Called to handle protocol-specific codes */
131 "IPCP" /* String name of protocol */
135 * Command-line options.
137 static int setvjslots __P((char **));
138 static int setdnsaddr __P((char **));
139 static int setwinsaddr __P((char **));
140 static int setnetmask __P((char **));
141 int setipaddr __P((char *, char **, int));
142 static void printipaddr __P((option_t *, void (*)(void *, char *,...),void *));
144 static option_t ipcp_option_list[] = {
145 { "noip", o_bool, &ipcp_protent.enabled_flag,
146 "Disable IP and IPCP" },
147 { "-ip", o_bool, &ipcp_protent.enabled_flag,
148 "Disable IP and IPCP", OPT_ALIAS },
150 { "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
151 "Disable VJ compression", OPT_A2CLR, &ipcp_allowoptions[0].neg_vj },
152 { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
153 "Disable VJ compression", OPT_ALIAS | OPT_A2CLR,
154 &ipcp_allowoptions[0].neg_vj },
156 { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
157 "Disable VJ connection-ID compression", OPT_A2CLR,
158 &ipcp_allowoptions[0].cflag },
159 { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
160 "Disable VJ connection-ID compression", OPT_ALIAS | OPT_A2CLR,
161 &ipcp_allowoptions[0].cflag },
163 { "vj-max-slots", o_special, (void *)setvjslots,
164 "Set maximum VJ header slots",
165 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, vj_value },
167 { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local,
168 "Accept peer's address for us", 1 },
169 { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote,
170 "Accept peer's address for it", 1 },
172 { "ipparam", o_string, &ipparam,
173 "Set ip script parameter", OPT_PRIO },
175 { "noipdefault", o_bool, &disable_defaultip,
176 "Don't use name for default IP adrs", 1 },
178 { "ms-dns", o_special, (void *)setdnsaddr,
179 "DNS address for the peer's use", OPT_A2LIST },
180 { "ms-wins", o_special, (void *)setwinsaddr,
181 "Nameserver for SMB over TCP/IP for peer", OPT_A2LIST },
183 { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
184 "Set timeout for IPCP", OPT_PRIO },
185 { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
186 "Set max #xmits for term-reqs", OPT_PRIO },
187 { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
188 "Set max #xmits for conf-reqs", OPT_PRIO },
189 { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
190 "Set max #conf-naks for IPCP", OPT_PRIO },
192 { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route,
193 "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route },
194 { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route,
195 "disable defaultroute option", OPT_A2CLR,
196 &ipcp_wantoptions[0].default_route },
197 { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
198 "disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
199 &ipcp_wantoptions[0].default_route },
201 { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
202 "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
203 { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
204 "disable proxyarp option", OPT_A2CLR,
205 &ipcp_wantoptions[0].proxy_arp },
206 { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
207 "disable proxyarp option", OPT_ALIAS | OPT_A2CLR,
208 &ipcp_wantoptions[0].proxy_arp },
210 { "usepeerdns", o_bool, &usepeerdns,
211 "Ask peer for DNS address(es)", 1 },
213 { "netmask", o_special, (void *)setnetmask,
214 "set netmask", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, netmask_str },
216 { "ipcp-no-addresses", o_bool, &ipcp_wantoptions[0].old_addrs,
217 "Disable old-style IP-Addresses usage", OPT_A2CLR,
218 &ipcp_allowoptions[0].old_addrs },
219 { "ipcp-no-address", o_bool, &ipcp_wantoptions[0].neg_addr,
220 "Disable IP-Address usage", OPT_A2CLR,
221 &ipcp_allowoptions[0].neg_addr },
223 { "noremoteip", o_bool, &noremoteip,
224 "Allow peer to have no IP address", 1 },
226 { "nosendip", o_bool, &ipcp_wantoptions[0].neg_addr,
227 "Don't send our IP address to peer", OPT_A2CLR,
228 &ipcp_wantoptions[0].old_addrs},
230 { "IP addresses", o_wild, (void *) &setipaddr,
231 "set local and remote IP addresses",
232 OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr },
238 * Protocol entry points from main code.
240 static void ipcp_init __P((int));
241 static void ipcp_open __P((int));
242 static void ipcp_close __P((int, char *));
243 static void ipcp_lowerup __P((int));
244 static void ipcp_lowerdown __P((int));
245 static void ipcp_input __P((int, u_char *, int));
246 static void ipcp_protrej __P((int));
247 static int ipcp_printpkt __P((u_char *, int,
248 void (*) __P((void *, char *, ...)), void *));
249 static void ip_check_options __P((void));
250 static int ip_demand_conf __P((int));
251 static int ip_active_pkt __P((u_char *, int));
252 static void create_resolv __P((u_int32_t, u_int32_t));
254 struct protent ipcp_protent = {
274 static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t));
275 static void ipcp_script __P((char *, int)); /* Run an up/down script */
276 static void ipcp_script_done __P((void *));
279 * Lengths of configuration options.
282 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
283 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
284 #define CILEN_ADDR 6 /* new-style single address option */
285 #define CILEN_ADDRS 10 /* old-style dual address option */
288 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
289 (x) == CONFNAK ? "NAK" : "REJ")
292 * This state variable is used to ensure that we don't
293 * run an ipcp-up/down script while one is already running.
295 static enum script_state {
299 static pid_t ipcp_script_pid;
302 * Make a string representation of a network IP address.
310 slprintf(b, sizeof(b), "%I", ipaddr);
319 * setvjslots - set maximum number of connection slots for VJ compression
327 if (!int_option(*argv, &value))
329 if (value < 2 || value > 16) {
330 option_error("vj-max-slots value must be between 2 and 16");
333 ipcp_wantoptions [0].maxslotindex =
334 ipcp_allowoptions[0].maxslotindex = value - 1;
335 slprintf(vj_value, sizeof(vj_value), "%d", value);
340 * setdnsaddr - set the dns address(es)
349 dns = inet_addr(*argv);
350 if (dns == (u_int32_t) -1) {
351 if ((hp = gethostbyname(*argv)) == NULL) {
352 option_error("invalid address parameter '%s' for ms-dns option",
356 dns = *(u_int32_t *)hp->h_addr;
359 /* We take the last 2 values given, the 2nd-last as the primary
360 and the last as the secondary. If only one is given it
361 becomes both primary and secondary. */
362 if (ipcp_allowoptions[0].dnsaddr[1] == 0)
363 ipcp_allowoptions[0].dnsaddr[0] = dns;
365 ipcp_allowoptions[0].dnsaddr[0] = ipcp_allowoptions[0].dnsaddr[1];
367 /* always set the secondary address value. */
368 ipcp_allowoptions[0].dnsaddr[1] = dns;
374 * setwinsaddr - set the wins address(es)
375 * This is primrarly used with the Samba package under UNIX or for pointing
376 * the caller to the existing WINS server on a Windows NT platform.
385 wins = inet_addr(*argv);
386 if (wins == (u_int32_t) -1) {
387 if ((hp = gethostbyname(*argv)) == NULL) {
388 option_error("invalid address parameter '%s' for ms-wins option",
392 wins = *(u_int32_t *)hp->h_addr;
395 /* We take the last 2 values given, the 2nd-last as the primary
396 and the last as the secondary. If only one is given it
397 becomes both primary and secondary. */
398 if (ipcp_allowoptions[0].winsaddr[1] == 0)
399 ipcp_allowoptions[0].winsaddr[0] = wins;
401 ipcp_allowoptions[0].winsaddr[0] = ipcp_allowoptions[0].winsaddr[1];
403 /* always set the secondary address value. */
404 ipcp_allowoptions[0].winsaddr[1] = wins;
410 * setipaddr - Set the IP address
411 * If doit is 0, the call is to check whether this option is
412 * potentially an IP address specification.
413 * Not static so that plugins can call it to set the addresses
416 setipaddr(arg, argv, doit)
423 u_int32_t local, remote;
424 ipcp_options *wo = &ipcp_wantoptions[0];
425 static int prio_local = 0, prio_remote = 0;
428 * IP address pair separated by ":".
430 if ((colon = strchr(arg, ':')) == NULL)
436 * If colon first character, then no local addr.
438 if (colon != arg && option_priority >= prio_local) {
440 if ((local = inet_addr(arg)) == (u_int32_t) -1) {
441 if ((hp = gethostbyname(arg)) == NULL) {
442 option_error("unknown host: %s", arg);
445 local = *(u_int32_t *)hp->h_addr;
447 if (bad_ip_adrs(local)) {
448 option_error("bad local IP address %s", ip_ntoa(local));
454 prio_local = option_priority;
458 * If colon last character, then no remote addr.
460 if (*++colon != '\0' && option_priority >= prio_remote) {
461 if ((remote = inet_addr(colon)) == (u_int32_t) -1) {
462 if ((hp = gethostbyname(colon)) == NULL) {
463 option_error("unknown host: %s", colon);
466 remote = *(u_int32_t *)hp->h_addr;
467 if (remote_name[0] == 0)
468 strlcpy(remote_name, colon, sizeof(remote_name));
470 if (bad_ip_adrs(remote)) {
471 option_error("bad remote IP address %s", ip_ntoa(remote));
475 wo->hisaddr = remote;
476 prio_remote = option_priority;
483 printipaddr(opt, printer, arg)
485 void (*printer) __P((void *, char *, ...));
488 ipcp_options *wo = &ipcp_wantoptions[0];
490 if (wo->ouraddr != 0)
491 printer(arg, "%I", wo->ouraddr);
493 if (wo->hisaddr != 0)
494 printer(arg, "%I", wo->hisaddr);
498 * setnetmask - set the netmask to be used on the interface.
509 * Unfortunately, if we use inet_addr, we can't tell whether
510 * a result of all 1s is an error or a valid 255.255.255.255.
513 n = parse_dotted_ip(p, &mask);
517 if (n == 0 || p[n] != 0 || (netmask & ~mask) != 0) {
518 option_error("invalid netmask value '%s'", *argv);
523 slprintf(netmask_str, sizeof(netmask_str), "%I", mask);
529 parse_dotted_ip(p, vp)
539 b = strtoul(p, &endp, 0);
545 /* accept e.g. 0xffffff00 */
563 * ipcp_init - Initialize IPCP.
569 fsm *f = &ipcp_fsm[unit];
570 ipcp_options *wo = &ipcp_wantoptions[unit];
571 ipcp_options *ao = &ipcp_allowoptions[unit];
574 f->protocol = PPP_IPCP;
575 f->callbacks = &ipcp_callbacks;
576 fsm_init(&ipcp_fsm[unit]);
579 * Some 3G modems use repeated IPCP NAKs as a way of stalling
580 * until they can contact a server on the network, so we increase
581 * the default number of NAKs we accept before we start treating
584 f->maxnakloops = 100;
586 memset(wo, 0, sizeof(*wo));
587 memset(ao, 0, sizeof(*ao));
589 wo->neg_addr = wo->old_addrs = 1;
591 wo->vj_protocol = IPCP_VJ_COMP;
592 wo->maxslotindex = MAX_STATES - 1; /* really max index */
596 /* max slots and slot-id compression are currently hardwired in */
597 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
600 ao->neg_addr = ao->old_addrs = 1;
602 ao->maxslotindex = MAX_STATES - 1;
606 * XXX These control whether the user may use the proxyarp
607 * and defaultroute options.
610 ao->default_route = 1;
615 * ipcp_open - IPCP is allowed to come up.
621 fsm_open(&ipcp_fsm[unit]);
627 * ipcp_close - Take IPCP down.
630 ipcp_close(unit, reason)
634 fsm_close(&ipcp_fsm[unit], reason);
639 * ipcp_lowerup - The lower layer is up.
645 fsm_lowerup(&ipcp_fsm[unit]);
650 * ipcp_lowerdown - The lower layer is down.
656 fsm_lowerdown(&ipcp_fsm[unit]);
661 * ipcp_input - Input IPCP packet.
664 ipcp_input(unit, p, len)
669 fsm_input(&ipcp_fsm[unit], p, len);
674 * ipcp_protrej - A Protocol-Reject was received for IPCP.
676 * Pretend the lower layer went down, so we shut up.
682 fsm_lowerdown(&ipcp_fsm[unit]);
687 * ipcp_resetci - Reset our CI.
688 * Called by fsm_sconfreq, Send Configure Request.
694 ipcp_options *wo = &ipcp_wantoptions[f->unit];
695 ipcp_options *go = &ipcp_gotoptions[f->unit];
696 ipcp_options *ao = &ipcp_allowoptions[f->unit];
698 wo->req_addr = (wo->neg_addr || wo->old_addrs) &&
699 (ao->neg_addr || ao->old_addrs);
700 if (wo->ouraddr == 0)
701 wo->accept_local = 1;
702 if (wo->hisaddr == 0)
703 wo->accept_remote = 1;
704 wo->req_dns1 = usepeerdns; /* Request DNS addresses from the peer */
705 wo->req_dns2 = usepeerdns;
709 if (ip_choose_hook) {
710 ip_choose_hook(&wo->hisaddr);
712 wo->accept_remote = 0;
715 BZERO(&ipcp_hisoptions[f->unit], sizeof(ipcp_options));
720 * ipcp_cilen - Return length of our CI.
721 * Called by fsm_sconfreq, Send Configure Request.
727 ipcp_options *go = &ipcp_gotoptions[f->unit];
728 ipcp_options *wo = &ipcp_wantoptions[f->unit];
729 ipcp_options *ho = &ipcp_hisoptions[f->unit];
731 #define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0)
732 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
733 #define LENCIADDR(neg) (neg ? CILEN_ADDR : 0)
734 #define LENCIDNS(neg) LENCIADDR(neg)
735 #define LENCIWINS(neg) LENCIADDR(neg)
738 * First see if we want to change our options to the old
739 * forms because we have received old forms from the peer.
741 if (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs)
743 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
744 /* try an older style of VJ negotiation */
745 /* use the old style only if the peer did */
746 if (ho->neg_vj && ho->old_vj) {
749 go->vj_protocol = ho->vj_protocol;
753 return (LENCIADDRS(!go->neg_addr && go->old_addrs) +
754 LENCIVJ(go->neg_vj, go->old_vj) +
755 LENCIADDR(go->neg_addr) +
756 LENCIDNS(go->req_dns1) +
757 LENCIDNS(go->req_dns2) +
758 LENCIWINS(go->winsaddr[0]) +
759 LENCIWINS(go->winsaddr[1])) ;
764 * ipcp_addci - Add our desired CIs to a packet.
765 * Called by fsm_sconfreq, Send Configure Request.
768 ipcp_addci(f, ucp, lenp)
773 ipcp_options *go = &ipcp_gotoptions[f->unit];
776 #define ADDCIADDRS(opt, neg, val1, val2) \
778 if (len >= CILEN_ADDRS) { \
781 PUTCHAR(CILEN_ADDRS, ucp); \
786 len -= CILEN_ADDRS; \
791 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
793 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
794 if (len >= vjlen) { \
796 PUTCHAR(vjlen, ucp); \
797 PUTSHORT(val, ucp); \
799 PUTCHAR(maxslotindex, ucp); \
800 PUTCHAR(cflag, ucp); \
807 #define ADDCIADDR(opt, neg, val) \
809 if (len >= CILEN_ADDR) { \
812 PUTCHAR(CILEN_ADDR, ucp); \
820 #define ADDCIDNS(opt, neg, addr) \
822 if (len >= CILEN_ADDR) { \
825 PUTCHAR(CILEN_ADDR, ucp); \
833 #define ADDCIWINS(opt, addr) \
835 if (len >= CILEN_ADDR) { \
838 PUTCHAR(CILEN_ADDR, ucp); \
846 ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
849 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
850 go->maxslotindex, go->cflag);
852 ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
854 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
856 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
858 ADDCIWINS(CI_MS_WINS1, go->winsaddr[0]);
860 ADDCIWINS(CI_MS_WINS2, go->winsaddr[1]);
867 * ipcp_ackci - Ack our CIs.
868 * Called by fsm_rconfack, Receive Configure ACK.
875 ipcp_ackci(f, p, len)
880 ipcp_options *go = &ipcp_gotoptions[f->unit];
881 u_short cilen, citype, cishort;
883 u_char cimaxslotindex, cicflag;
886 * CIs must be in exactly the same order that we sent...
887 * Check packet length and CI length at each step.
888 * If we find any deviations, then this packet is bad.
891 #define ACKCIADDRS(opt, neg, val1, val2) \
894 if ((len -= CILEN_ADDRS) < 0) \
896 GETCHAR(citype, p); \
898 if (cilen != CILEN_ADDRS || \
903 if (val1 != cilong) \
907 if (val2 != cilong) \
911 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
913 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
914 if ((len -= vjlen) < 0) \
916 GETCHAR(citype, p); \
918 if (cilen != vjlen || \
921 GETSHORT(cishort, p); \
922 if (cishort != val) \
925 GETCHAR(cimaxslotindex, p); \
926 if (cimaxslotindex != maxslotindex) \
928 GETCHAR(cicflag, p); \
929 if (cicflag != cflag) \
934 #define ACKCIADDR(opt, neg, val) \
937 if ((len -= CILEN_ADDR) < 0) \
939 GETCHAR(citype, p); \
941 if (cilen != CILEN_ADDR || \
950 #define ACKCIDNS(opt, neg, addr) \
953 if ((len -= CILEN_ADDR) < 0) \
955 GETCHAR(citype, p); \
957 if (cilen != CILEN_ADDR || citype != opt) \
961 if (addr != cilong) \
965 #define ACKCIWINS(opt, addr) \
968 if ((len -= CILEN_ADDR) < 0) \
970 GETCHAR(citype, p); \
972 if (cilen != CILEN_ADDR || citype != opt) \
976 if (addr != cilong) \
980 ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
983 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
984 go->maxslotindex, go->cflag);
986 ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
988 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
990 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
992 ACKCIWINS(CI_MS_WINS1, go->winsaddr[0]);
994 ACKCIWINS(CI_MS_WINS2, go->winsaddr[1]);
997 * If there are any remaining CIs, then this packet is bad.
1004 IPCPDEBUG(("ipcp_ackci: received bad Ack!"));
1009 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
1010 * This should not modify any state if the Nak is bad
1011 * or if IPCP is in the OPENED state.
1012 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
1019 ipcp_nakci(f, p, len, treat_as_reject)
1023 int treat_as_reject;
1025 ipcp_options *go = &ipcp_gotoptions[f->unit];
1026 u_char cimaxslotindex, cicflag;
1027 u_char citype, cilen, *next;
1029 u_int32_t ciaddr1, ciaddr2, l, cidnsaddr;
1030 ipcp_options no; /* options we've seen Naks for */
1031 ipcp_options try; /* options to request next time */
1033 BZERO(&no, sizeof(no));
1037 * Any Nak'd CIs must be in exactly the same order that we sent.
1038 * Check packet length and CI length at each step.
1039 * If we find any deviations, then this packet is bad.
1041 #define NAKCIADDRS(opt, neg, code) \
1043 (cilen = p[1]) == CILEN_ADDRS && \
1049 ciaddr1 = htonl(l); \
1051 ciaddr2 = htonl(l); \
1056 #define NAKCIVJ(opt, neg, code) \
1058 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
1063 GETSHORT(cishort, p); \
1068 #define NAKCIADDR(opt, neg, code) \
1070 (cilen = p[1]) == CILEN_ADDR && \
1076 ciaddr1 = htonl(l); \
1081 #define NAKCIDNS(opt, neg, code) \
1083 ((cilen = p[1]) == CILEN_ADDR) && \
1089 cidnsaddr = htonl(l); \
1095 * Accept the peer's idea of {our,his} address, if different
1096 * from our idea, only if the accept_{local,remote} flag is set.
1098 NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1099 if (treat_as_reject) {
1102 if (go->accept_local && ciaddr1) {
1103 /* take his idea of our address */
1104 try.ouraddr = ciaddr1;
1106 if (go->accept_remote && ciaddr2) {
1107 /* take his idea of his address */
1108 try.hisaddr = ciaddr2;
1114 * Accept the peer's value of maxslotindex provided that it
1115 * is less than what we asked for. Turn off slot-ID compression
1116 * if the peer wants. Send old-style compress-type option if
1119 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
1120 if (treat_as_reject) {
1122 } else if (cilen == CILEN_VJ) {
1123 GETCHAR(cimaxslotindex, p);
1124 GETCHAR(cicflag, p);
1125 if (cishort == IPCP_VJ_COMP) {
1127 if (cimaxslotindex < go->maxslotindex)
1128 try.maxslotindex = cimaxslotindex;
1135 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
1137 try.vj_protocol = cishort;
1144 NAKCIADDR(CI_ADDR, neg_addr,
1145 if (treat_as_reject) {
1148 } else if (go->accept_local && ciaddr1) {
1149 /* take his idea of our address */
1150 try.ouraddr = ciaddr1;
1154 NAKCIDNS(CI_MS_DNS1, req_dns1,
1155 if (treat_as_reject) {
1158 try.dnsaddr[0] = cidnsaddr;
1162 NAKCIDNS(CI_MS_DNS2, req_dns2,
1163 if (treat_as_reject) {
1166 try.dnsaddr[1] = cidnsaddr;
1171 * There may be remaining CIs, if the peer is requesting negotiation
1172 * on an option that we didn't include in our request packet.
1173 * If they want to negotiate about IP addresses, we comply.
1174 * If they want us to ask for compression, we refuse.
1175 * If they want us to ask for ms-dns, we do that, since some
1176 * peers get huffy if we don't.
1178 while (len >= CILEN_VOID) {
1181 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
1183 next = p + cilen - 2;
1186 case CI_COMPRESSTYPE:
1187 if (go->neg_vj || no.neg_vj ||
1188 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
1193 if ((!go->neg_addr && go->old_addrs) || no.old_addrs
1194 || cilen != CILEN_ADDRS)
1199 if (ciaddr1 && go->accept_local)
1200 try.ouraddr = ciaddr1;
1203 if (ciaddr2 && go->accept_remote)
1204 try.hisaddr = ciaddr2;
1208 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
1213 if (ciaddr1 && go->accept_local)
1214 try.ouraddr = ciaddr1;
1215 if (try.ouraddr != 0)
1220 if (go->req_dns1 || no.req_dns1 || cilen != CILEN_ADDR)
1223 try.dnsaddr[0] = htonl(l);
1228 if (go->req_dns2 || no.req_dns2 || cilen != CILEN_ADDR)
1231 try.dnsaddr[1] = htonl(l);
1237 if (cilen != CILEN_ADDR)
1242 try.winsaddr[citype == CI_MS_WINS2] = ciaddr1;
1249 * OK, the Nak is good. Now we can update state.
1250 * If there are any remaining options, we ignore them.
1252 if (f->state != OPENED)
1258 IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
1264 * ipcp_rejci - Reject some of our CIs.
1265 * Callback from fsm_rconfnakrej.
1268 ipcp_rejci(f, p, len)
1273 ipcp_options *go = &ipcp_gotoptions[f->unit];
1274 u_char cimaxslotindex, ciflag, cilen;
1277 ipcp_options try; /* options to request next time */
1281 * Any Rejected CIs must be in exactly the same order that we sent.
1282 * Check packet length and CI length at each step.
1283 * If we find any deviations, then this packet is bad.
1285 #define REJCIADDRS(opt, neg, val1, val2) \
1287 (cilen = p[1]) == CILEN_ADDRS && \
1294 cilong = htonl(l); \
1295 /* Check rejected value. */ \
1296 if (cilong != val1) \
1299 cilong = htonl(l); \
1300 /* Check rejected value. */ \
1301 if (cilong != val2) \
1303 try.old_addrs = 0; \
1306 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
1308 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
1313 GETSHORT(cishort, p); \
1314 /* Check rejected value. */ \
1315 if (cishort != val) \
1318 GETCHAR(cimaxslotindex, p); \
1319 if (cimaxslotindex != maxslot) \
1321 GETCHAR(ciflag, p); \
1322 if (ciflag != cflag) \
1328 #define REJCIADDR(opt, neg, val) \
1330 (cilen = p[1]) == CILEN_ADDR && \
1337 cilong = htonl(l); \
1338 /* Check rejected value. */ \
1339 if (cilong != val) \
1344 #define REJCIDNS(opt, neg, dnsaddr) \
1346 ((cilen = p[1]) == CILEN_ADDR) && \
1353 cilong = htonl(l); \
1354 /* Check rejected value. */ \
1355 if (cilong != dnsaddr) \
1360 #define REJCIWINS(opt, addr) \
1362 ((cilen = p[1]) == CILEN_ADDR) && \
1369 cilong = htonl(l); \
1370 /* Check rejected value. */ \
1371 if (cilong != addr) \
1373 try.winsaddr[opt == CI_MS_WINS2] = 0; \
1376 REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1377 go->ouraddr, go->hisaddr);
1379 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
1380 go->maxslotindex, go->cflag);
1382 REJCIADDR(CI_ADDR, neg_addr, go->ouraddr);
1384 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
1386 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
1388 REJCIWINS(CI_MS_WINS1, go->winsaddr[0]);
1390 REJCIWINS(CI_MS_WINS2, go->winsaddr[1]);
1393 * If there are any remaining CIs, then this packet is bad.
1398 * Now we can update state.
1400 if (f->state != OPENED)
1405 IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
1411 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
1412 * Callback from fsm_rconfreq, Receive Configure Request
1414 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1415 * appropriately. If reject_if_disagree is non-zero, doesn't return
1416 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1419 ipcp_reqci(f, inp, len, reject_if_disagree)
1421 u_char *inp; /* Requested CIs */
1422 int *len; /* Length of requested CIs */
1423 int reject_if_disagree;
1425 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1426 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1427 ipcp_options *ao = &ipcp_allowoptions[f->unit];
1428 u_char *cip, *next; /* Pointer to current and next CIs */
1429 u_short cilen, citype; /* Parsed len, type */
1430 u_short cishort; /* Parsed short value */
1431 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
1432 int rc = CONFACK; /* Final packet return code */
1433 int orc; /* Individual option return code */
1434 u_char *p; /* Pointer to next char to parse */
1435 u_char *ucp = inp; /* Pointer to current output char */
1436 int l = *len; /* Length left */
1437 u_char maxslotindex, cflag;
1441 * Reset all his options.
1443 BZERO(ho, sizeof(*ho));
1446 * Process all his options.
1450 orc = CONFACK; /* Assume success */
1451 cip = p = next; /* Remember begining of CI */
1452 if (l < 2 || /* Not enough data for CI header or */
1453 p[1] < 2 || /* CI length too small or */
1454 p[1] > l) { /* CI length too big? */
1455 IPCPDEBUG(("ipcp_reqci: bad CI length!"));
1456 orc = CONFREJ; /* Reject bad CI */
1457 cilen = l; /* Reject till end of packet */
1458 l = 0; /* Don't loop again */
1461 GETCHAR(citype, p); /* Parse CI type */
1462 GETCHAR(cilen, p); /* Parse CI length */
1463 l -= cilen; /* Adjust remaining length */
1464 next += cilen; /* Step to next CI */
1466 switch (citype) { /* Check CI type */
1468 if (!ao->old_addrs || ho->neg_addr ||
1469 cilen != CILEN_ADDRS) { /* Check CI length */
1470 orc = CONFREJ; /* Reject CI */
1475 * If he has no address, or if we both have his address but
1476 * disagree about it, then NAK it with our idea.
1477 * In particular, if we don't know his address, but he does,
1480 GETLONG(tl, p); /* Parse source address (his) */
1481 ciaddr1 = htonl(tl);
1482 if (ciaddr1 != wo->hisaddr
1483 && (ciaddr1 == 0 || !wo->accept_remote)) {
1485 if (!reject_if_disagree) {
1486 DECPTR(sizeof(u_int32_t), p);
1487 tl = ntohl(wo->hisaddr);
1490 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1492 * If neither we nor he knows his address, reject the option.
1495 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1500 * If he doesn't know our address, or if we both have our address
1501 * but disagree about it, then NAK it with our idea.
1503 GETLONG(tl, p); /* Parse desination address (ours) */
1504 ciaddr2 = htonl(tl);
1505 if (ciaddr2 != wo->ouraddr) {
1506 if (ciaddr2 == 0 || !wo->accept_local) {
1508 if (!reject_if_disagree) {
1509 DECPTR(sizeof(u_int32_t), p);
1510 tl = ntohl(wo->ouraddr);
1514 wo->ouraddr = ciaddr2; /* accept peer's idea */
1519 ho->hisaddr = ciaddr1;
1520 ho->ouraddr = ciaddr2;
1524 if (!ao->neg_addr || ho->old_addrs ||
1525 cilen != CILEN_ADDR) { /* Check CI length */
1526 orc = CONFREJ; /* Reject CI */
1531 * If he has no address, or if we both have his address but
1532 * disagree about it, then NAK it with our idea.
1533 * In particular, if we don't know his address, but he does,
1536 GETLONG(tl, p); /* Parse source address (his) */
1537 ciaddr1 = htonl(tl);
1538 if (ciaddr1 != wo->hisaddr
1539 && (ciaddr1 == 0 || !wo->accept_remote)) {
1541 if (!reject_if_disagree) {
1542 DECPTR(sizeof(u_int32_t), p);
1543 tl = ntohl(wo->hisaddr);
1546 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1548 * Don't ACK an address of 0.0.0.0 - reject it instead.
1551 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1556 ho->hisaddr = ciaddr1;
1561 /* Microsoft primary or secondary DNS request */
1562 d = citype == CI_MS_DNS2;
1564 /* If we do not have a DNS address then we cannot send it */
1565 if (ao->dnsaddr[d] == 0 ||
1566 cilen != CILEN_ADDR) { /* Check CI length */
1567 orc = CONFREJ; /* Reject CI */
1571 if (htonl(tl) != ao->dnsaddr[d]) {
1572 DECPTR(sizeof(u_int32_t), p);
1573 tl = ntohl(ao->dnsaddr[d]);
1581 /* Microsoft primary or secondary WINS request */
1582 d = citype == CI_MS_WINS2;
1584 /* If we do not have a DNS address then we cannot send it */
1585 if (ao->winsaddr[d] == 0 ||
1586 cilen != CILEN_ADDR) { /* Check CI length */
1587 orc = CONFREJ; /* Reject CI */
1591 if (htonl(tl) != ao->winsaddr[d]) {
1592 DECPTR(sizeof(u_int32_t), p);
1593 tl = ntohl(ao->winsaddr[d]);
1599 case CI_COMPRESSTYPE:
1601 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
1605 GETSHORT(cishort, p);
1607 if (!(cishort == IPCP_VJ_COMP ||
1608 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1614 ho->vj_protocol = cishort;
1615 if (cilen == CILEN_VJ) {
1616 GETCHAR(maxslotindex, p);
1617 if (maxslotindex > ao->maxslotindex) {
1619 if (!reject_if_disagree){
1621 PUTCHAR(ao->maxslotindex, p);
1625 if (cflag && !ao->cflag) {
1627 if (!reject_if_disagree){
1629 PUTCHAR(wo->cflag, p);
1632 ho->maxslotindex = maxslotindex;
1636 ho->maxslotindex = MAX_STATES - 1;
1646 if (orc == CONFACK && /* Good CI */
1647 rc != CONFACK) /* but prior CI wasnt? */
1648 continue; /* Don't send this one */
1650 if (orc == CONFNAK) { /* Nak this CI? */
1651 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1652 orc = CONFREJ; /* Get tough if so */
1654 if (rc == CONFREJ) /* Rejecting prior CI? */
1655 continue; /* Don't send this one */
1656 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1657 rc = CONFNAK; /* Not anymore... */
1658 ucp = inp; /* Backup */
1663 if (orc == CONFREJ && /* Reject this CI */
1664 rc != CONFREJ) { /* but no prior ones? */
1666 ucp = inp; /* Backup */
1669 /* Need to move CI? */
1671 BCOPY(cip, ucp, cilen); /* Move it */
1673 /* Update output pointer */
1678 * If we aren't rejecting this packet, and we want to negotiate
1679 * their address, and they didn't send their address, then we
1680 * send a NAK with a CI_ADDR option appended. We assume the
1681 * input buffer is long enough that we can append the extra
1684 if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs &&
1685 wo->req_addr && !reject_if_disagree && !noremoteip) {
1686 if (rc == CONFACK) {
1688 ucp = inp; /* reset pointer */
1689 wo->req_addr = 0; /* don't ask again */
1691 PUTCHAR(CI_ADDR, ucp);
1692 PUTCHAR(CILEN_ADDR, ucp);
1693 tl = ntohl(wo->hisaddr);
1697 *len = ucp - inp; /* Compute output length */
1698 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
1699 return (rc); /* Return final code */
1704 * ip_check_options - check that any IP-related options are OK,
1705 * and assign appropriate defaults.
1712 ipcp_options *wo = &ipcp_wantoptions[0];
1715 * Default our local IP address based on our hostname.
1716 * If local IP address already given, don't bother.
1718 if (wo->ouraddr == 0 && !disable_defaultip) {
1720 * Look up our hostname (possibly with domain name appended)
1721 * and take the first IP address as our local IP address.
1722 * If there isn't an IP address for our hostname, too bad.
1724 wo->accept_local = 1; /* don't insist on this default value */
1725 if ((hp = gethostbyname(hostname)) != NULL) {
1726 local = *(u_int32_t *)hp->h_addr;
1727 if (local != 0 && !bad_ip_adrs(local))
1728 wo->ouraddr = local;
1731 ask_for_local = wo->ouraddr != 0 || !disable_defaultip;
1736 * ip_demand_conf - configure the interface as though
1737 * IPCP were up, for use with dial-on-demand.
1743 ipcp_options *wo = &ipcp_wantoptions[u];
1745 if (wo->hisaddr == 0 && !noremoteip) {
1746 /* make up an arbitrary address for the peer */
1747 wo->hisaddr = htonl(0x0a707070 + ifunit);
1748 wo->accept_remote = 1;
1750 if (wo->ouraddr == 0) {
1751 /* make up an arbitrary address for us */
1752 wo->ouraddr = htonl(0x0a404040 + ifunit);
1753 wo->accept_local = 1;
1754 ask_for_local = 0; /* don't tell the peer this address */
1756 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1758 ipcp_script(_PATH_IPPREUP, 1);
1761 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1763 if (wo->default_route)
1764 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1765 default_route_set[u] = 1;
1767 if (sifproxyarp(u, wo->hisaddr))
1768 proxy_arp_set[u] = 1;
1770 notice("local IP address %I", wo->ouraddr);
1772 notice("remote IP address %I", wo->hisaddr);
1779 * ipcp_up - IPCP has come UP.
1781 * Configure the IP network interface appropriately and bring it up.
1788 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1789 ipcp_options *go = &ipcp_gotoptions[f->unit];
1790 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1792 IPCPDEBUG(("ipcp: up"));
1795 * We must have a non-zero IP address for both ends of the link.
1797 if (!ho->neg_addr && !ho->old_addrs)
1798 ho->hisaddr = wo->hisaddr;
1800 if (!(go->neg_addr || go->old_addrs) && (wo->neg_addr || wo->old_addrs)
1801 && wo->ouraddr != 0) {
1802 error("Peer refused to agree to our IP address");
1803 ipcp_close(f->unit, "Refused our IP address");
1806 if (go->ouraddr == 0) {
1807 error("Could not determine local IP address");
1808 ipcp_close(f->unit, "Could not determine local IP address");
1811 if (ho->hisaddr == 0 && !noremoteip) {
1812 ho->hisaddr = htonl(0x0a404040 + ifunit);
1813 warn("Could not determine remote IP address: defaulting to %I",
1816 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
1817 if (ho->hisaddr != 0)
1818 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
1825 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
1827 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
1828 if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1829 script_setenv("USEPEERDNS", "1", 0);
1830 create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
1834 * Check that the peer is allowed to use the IP address it wants.
1836 if (ho->hisaddr != 0 && !auth_ip_addr(f->unit, ho->hisaddr)) {
1837 error("Peer is not authorized to use remote address %I", ho->hisaddr);
1838 ipcp_close(f->unit, "Unauthorized remote IP address");
1842 /* set tcp compression */
1843 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1846 * If we are doing dial-on-demand, the interface is already
1847 * configured, so we put out any saved-up packets, then set the
1848 * interface to pass IP packets.
1851 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1852 ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
1853 if (go->ouraddr != wo->ouraddr) {
1854 warn("Local IP address changed to %I", go->ouraddr);
1855 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
1856 wo->ouraddr = go->ouraddr;
1858 script_unsetenv("OLDIPLOCAL");
1859 if (ho->hisaddr != wo->hisaddr && wo->hisaddr != 0) {
1860 warn("Remote IP address changed to %I", ho->hisaddr);
1861 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0);
1862 wo->hisaddr = ho->hisaddr;
1864 script_unsetenv("OLDIPREMOTE");
1866 /* Set the interface to the new addresses */
1867 mask = GetMask(go->ouraddr);
1868 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1870 warn("Interface configuration failed");
1871 ipcp_close(f->unit, "Interface configuration failed");
1875 /* assign a default route through the interface if required */
1876 if (ipcp_wantoptions[f->unit].default_route)
1877 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1878 default_route_set[f->unit] = 1;
1880 /* Make a proxy ARP entry if requested. */
1881 if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
1882 if (sifproxyarp(f->unit, ho->hisaddr))
1883 proxy_arp_set[f->unit] = 1;
1886 demand_rexmit(PPP_IP);
1887 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1891 * Set IP addresses and (if specified) netmask.
1893 mask = GetMask(go->ouraddr);
1895 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1896 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1898 warn("Interface configuration failed");
1899 ipcp_close(f->unit, "Interface configuration failed");
1904 /* run the pre-up script, if any, and wait for it to finish */
1905 ipcp_script(_PATH_IPPREUP, 1);
1907 /* bring the interface up for IP */
1908 if (!sifup(f->unit)) {
1910 warn("Interface failed to come up");
1911 ipcp_close(f->unit, "Interface configuration failed");
1915 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1916 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1918 warn("Interface configuration failed");
1919 ipcp_close(f->unit, "Interface configuration failed");
1923 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1925 /* assign a default route through the interface if required */
1926 if (ipcp_wantoptions[f->unit].default_route)
1927 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1928 default_route_set[f->unit] = 1;
1930 /* Make a proxy ARP entry if requested. */
1931 if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
1932 if (sifproxyarp(f->unit, ho->hisaddr))
1933 proxy_arp_set[f->unit] = 1;
1935 ipcp_wantoptions[0].ouraddr = go->ouraddr;
1937 notice("local IP address %I", go->ouraddr);
1938 if (ho->hisaddr != 0)
1939 notice("remote IP address %I", ho->hisaddr);
1941 notice("primary DNS address %I", go->dnsaddr[0]);
1943 notice("secondary DNS address %I", go->dnsaddr[1]);
1946 reset_link_stats(f->unit);
1948 np_up(f->unit, PPP_IP);
1951 notify(ip_up_notifier, 0);
1956 * Execute the ip-up script, like this:
1957 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1959 if (ipcp_script_state == s_down && ipcp_script_pid == 0) {
1960 ipcp_script_state = s_up;
1961 ipcp_script(_PATH_IPUP, 0);
1967 * ipcp_down - IPCP has gone DOWN.
1969 * Take the IP network interface down, clear its addresses
1970 * and delete routes through it.
1976 IPCPDEBUG(("ipcp: down"));
1977 /* XXX a bit IPv4-centric here, we only need to get the stats
1978 * before the interface is marked down. */
1979 /* XXX more correct: we must get the stats before running the notifiers,
1980 * at least for the radius plugin */
1981 update_link_stats(f->unit);
1982 notify(ip_down_notifier, 0);
1987 np_down(f->unit, PPP_IP);
1989 sifvjcomp(f->unit, 0, 0, 0);
1991 print_link_stats(); /* _after_ running the notifiers and ip_down_hook(),
1992 * because print_link_stats() sets link_stats_valid
1996 * If we are doing dial-on-demand, set the interface
1997 * to queue up outgoing packets (for now).
2000 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
2002 sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
2004 ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
2005 ipcp_hisoptions[f->unit].hisaddr);
2008 /* Execute the ip-down script */
2009 if (ipcp_script_state == s_up && ipcp_script_pid == 0) {
2010 ipcp_script_state = s_down;
2011 ipcp_script(_PATH_IPDOWN, 0);
2017 * ipcp_clear_addrs() - clear the interface addresses, routes,
2018 * proxy arp entries, etc.
2021 ipcp_clear_addrs(unit, ouraddr, hisaddr)
2023 u_int32_t ouraddr; /* local address */
2024 u_int32_t hisaddr; /* remote address */
2026 if (proxy_arp_set[unit]) {
2027 cifproxyarp(unit, hisaddr);
2028 proxy_arp_set[unit] = 0;
2030 if (default_route_set[unit]) {
2031 cifdefaultroute(unit, ouraddr, hisaddr);
2032 default_route_set[unit] = 0;
2034 cifaddr(unit, ouraddr, hisaddr);
2039 * ipcp_finished - possibly shut down the lower layers.
2047 np_finished(f->unit, PPP_IP);
2053 * ipcp_script_done - called when the ip-up or ip-down script
2057 ipcp_script_done(arg)
2060 ipcp_script_pid = 0;
2061 switch (ipcp_script_state) {
2063 if (ipcp_fsm[0].state != OPENED) {
2064 ipcp_script_state = s_down;
2065 ipcp_script(_PATH_IPDOWN, 0);
2069 if (ipcp_fsm[0].state == OPENED) {
2070 ipcp_script_state = s_up;
2071 ipcp_script(_PATH_IPUP, 0);
2079 * ipcp_script - Execute a script with arguments
2080 * interface-name tty-name speed local-IP remote-IP.
2083 ipcp_script(script, wait)
2087 char strspeed[32], strlocal[32], strremote[32];
2090 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2091 slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr);
2092 slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr);
2099 argv[5] = strremote;
2103 run_program(script, argv, 0, NULL, NULL, 1);
2105 ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done,
2110 * create_resolv - create the replacement resolv.conf file
2113 create_resolv(peerdns1, peerdns2)
2114 u_int32_t peerdns1, peerdns2;
2118 f = fopen(_PATH_RESOLV, "w");
2120 error("Failed to create %s: %m", _PATH_RESOLV);
2125 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1));
2128 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2));
2131 error("Write failed to %s: %m", _PATH_RESOLV);
2137 * ipcp_printpkt - print the contents of an IPCP packet.
2139 static char *ipcp_codenames[] = {
2140 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
2141 "TermReq", "TermAck", "CodeRej"
2145 ipcp_printpkt(p, plen, printer, arg)
2148 void (*printer) __P((void *, char *, ...));
2151 int code, id, len, olen;
2152 u_char *pstart, *optend;
2156 if (plen < HEADERLEN)
2162 if (len < HEADERLEN || len > plen)
2165 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
2166 printer(arg, " %s", ipcp_codenames[code-1]);
2168 printer(arg, " code=0x%x", code);
2169 printer(arg, " id=0x%x", id);
2176 /* print option list */
2181 if (olen < 2 || olen > len) {
2189 if (olen == CILEN_ADDRS) {
2192 printer(arg, "addrs %I", htonl(cilong));
2194 printer(arg, " %I", htonl(cilong));
2197 case CI_COMPRESSTYPE:
2198 if (olen >= CILEN_COMPRESS) {
2200 GETSHORT(cishort, p);
2201 printer(arg, "compress ");
2206 case IPCP_VJ_COMP_OLD:
2207 printer(arg, "old-VJ");
2210 printer(arg, "0x%x", cishort);
2215 if (olen == CILEN_ADDR) {
2218 printer(arg, "addr %I", htonl(cilong));
2225 printer(arg, "ms-dns%d %I", (code == CI_MS_DNS1? 1: 2),
2232 printer(arg, "ms-wins %I", htonl(cilong));
2235 while (p < optend) {
2237 printer(arg, " %.2x", code);
2245 if (len > 0 && *p >= ' ' && *p < 0x7f) {
2247 print_string((char *)p, len, printer, arg);
2254 /* print the rest of the bytes in the packet */
2255 for (; len > 0; --len) {
2257 printer(arg, " %.2x", code);
2264 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
2265 * We don't bring the link up for IP fragments or for TCP FIN packets
2268 #define IP_HDRLEN 20 /* bytes */
2269 #define IP_OFFMASK 0x1fff
2271 #define IPPROTO_TCP 6
2273 #define TCP_HDRLEN 20
2277 * We use these macros because the IP header may be at an odd address,
2278 * and some compilers might use word loads to get th_off or ip_hl.
2281 #define net_short(x) (((x)[0] << 8) + (x)[1])
2282 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
2283 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
2284 #define get_ipproto(x) (((unsigned char *)(x))[9])
2285 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
2286 #define get_tcpflags(x) (((unsigned char *)(x))[13])
2289 ip_active_pkt(pkt, len)
2298 if (len < IP_HDRLEN)
2300 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
2302 if (get_ipproto(pkt) != IPPROTO_TCP)
2304 hlen = get_iphl(pkt) * 4;
2305 if (len < hlen + TCP_HDRLEN)
2308 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)