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
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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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43 #define RCSID "$Id: ipcp.c,v 1.62 2002/12/04 23:03:32 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 */
76 /* Hook for a plugin to know when IP protocol has come up */
77 void (*ip_up_hook) __P((void)) = NULL;
79 /* Hook for a plugin to know when IP protocol has come down */
80 void (*ip_down_hook) __P((void)) = NULL;
82 /* Hook for a plugin to choose the remote IP address */
83 void (*ip_choose_hook) __P((u_int32_t *)) = NULL;
85 /* Notifiers for when IPCP goes up and down */
86 struct notifier *ip_up_notifier = NULL;
87 struct notifier *ip_down_notifier = NULL;
90 static int default_route_set[NUM_PPP]; /* Have set up a default route */
91 static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */
92 static bool usepeerdns; /* Ask peer for DNS addrs */
93 static int ipcp_is_up; /* have called np_up() */
94 static bool ask_for_local; /* request our address from peer */
95 static char vj_value[8]; /* string form of vj option value */
96 static char netmask_str[20]; /* string form of netmask value */
99 * Callbacks for fsm code. (CI = Configuration Information)
101 static void ipcp_resetci __P((fsm *)); /* Reset our CI */
102 static int ipcp_cilen __P((fsm *)); /* Return length of our CI */
103 static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
104 static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
105 static int ipcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */
106 static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
107 static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
108 static void ipcp_up __P((fsm *)); /* We're UP */
109 static void ipcp_down __P((fsm *)); /* We're DOWN */
110 static void ipcp_finished __P((fsm *)); /* Don't need lower layer */
112 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
114 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
115 ipcp_resetci, /* Reset our Configuration Information */
116 ipcp_cilen, /* Length of our Configuration Information */
117 ipcp_addci, /* Add our Configuration Information */
118 ipcp_ackci, /* ACK our Configuration Information */
119 ipcp_nakci, /* NAK our Configuration Information */
120 ipcp_rejci, /* Reject our Configuration Information */
121 ipcp_reqci, /* Request peer's Configuration Information */
122 ipcp_up, /* Called when fsm reaches OPENED state */
123 ipcp_down, /* Called when fsm leaves OPENED state */
124 NULL, /* Called when we want the lower layer up */
125 ipcp_finished, /* Called when we want the lower layer down */
126 NULL, /* Called when Protocol-Reject received */
127 NULL, /* Retransmission is necessary */
128 NULL, /* Called to handle protocol-specific codes */
129 "IPCP" /* String name of protocol */
133 * Command-line options.
135 static int setvjslots __P((char **));
136 static int setdnsaddr __P((char **));
137 static int setwinsaddr __P((char **));
138 static int setnetmask __P((char **));
139 int setipaddr __P((char *, char **, int));
140 static void printipaddr __P((option_t *, void (*)(void *, char *,...),void *));
142 static option_t ipcp_option_list[] = {
143 { "noip", o_bool, &ipcp_protent.enabled_flag,
144 "Disable IP and IPCP" },
145 { "-ip", o_bool, &ipcp_protent.enabled_flag,
146 "Disable IP and IPCP", OPT_ALIAS },
148 { "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
149 "Disable VJ compression", OPT_A2CLR, &ipcp_allowoptions[0].neg_vj },
150 { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
151 "Disable VJ compression", OPT_ALIAS | OPT_A2CLR,
152 &ipcp_allowoptions[0].neg_vj },
154 { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
155 "Disable VJ connection-ID compression", OPT_A2CLR,
156 &ipcp_allowoptions[0].cflag },
157 { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
158 "Disable VJ connection-ID compression", OPT_ALIAS | OPT_A2CLR,
159 &ipcp_allowoptions[0].cflag },
161 { "vj-max-slots", o_special, (void *)setvjslots,
162 "Set maximum VJ header slots",
163 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, vj_value },
165 { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local,
166 "Accept peer's address for us", 1 },
167 { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote,
168 "Accept peer's address for it", 1 },
170 { "ipparam", o_string, &ipparam,
171 "Set ip script parameter", OPT_PRIO },
173 { "noipdefault", o_bool, &disable_defaultip,
174 "Don't use name for default IP adrs", 1 },
176 { "ms-dns", 1, (void *)setdnsaddr,
177 "DNS address for the peer's use" },
178 { "ms-wins", 1, (void *)setwinsaddr,
179 "Nameserver for SMB over TCP/IP for peer" },
181 { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
182 "Set timeout for IPCP", OPT_PRIO },
183 { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
184 "Set max #xmits for term-reqs", OPT_PRIO },
185 { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
186 "Set max #xmits for conf-reqs", OPT_PRIO },
187 { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
188 "Set max #conf-naks for IPCP", OPT_PRIO },
190 { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route,
191 "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route },
192 { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route,
193 "disable defaultroute option", OPT_A2CLR,
194 &ipcp_wantoptions[0].default_route },
195 { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
196 "disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
197 &ipcp_wantoptions[0].default_route },
199 { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
200 "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
201 { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
202 "disable proxyarp option", OPT_A2CLR,
203 &ipcp_wantoptions[0].proxy_arp },
204 { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
205 "disable proxyarp option", OPT_ALIAS | OPT_A2CLR,
206 &ipcp_wantoptions[0].proxy_arp },
208 { "usepeerdns", o_bool, &usepeerdns,
209 "Ask peer for DNS address(es)", 1 },
211 { "netmask", o_special, (void *)setnetmask,
212 "set netmask", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, netmask_str },
214 { "ipcp-no-addresses", o_bool, &ipcp_wantoptions[0].old_addrs,
215 "Disable old-style IP-Addresses usage", OPT_A2CLR,
216 &ipcp_allowoptions[0].old_addrs },
217 { "ipcp-no-address", o_bool, &ipcp_wantoptions[0].neg_addr,
218 "Disable IP-Address usage", OPT_A2CLR,
219 &ipcp_allowoptions[0].neg_addr },
221 { "IP addresses", o_wild, (void *) &setipaddr,
222 "set local and remote IP addresses",
223 OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr },
229 * Protocol entry points from main code.
231 static void ipcp_init __P((int));
232 static void ipcp_open __P((int));
233 static void ipcp_close __P((int, char *));
234 static void ipcp_lowerup __P((int));
235 static void ipcp_lowerdown __P((int));
236 static void ipcp_input __P((int, u_char *, int));
237 static void ipcp_protrej __P((int));
238 static int ipcp_printpkt __P((u_char *, int,
239 void (*) __P((void *, char *, ...)), void *));
240 static void ip_check_options __P((void));
241 static int ip_demand_conf __P((int));
242 static int ip_active_pkt __P((u_char *, int));
243 static void create_resolv __P((u_int32_t, u_int32_t));
245 struct protent ipcp_protent = {
265 static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t));
266 static void ipcp_script __P((char *)); /* Run an up/down script */
267 static void ipcp_script_done __P((void *));
270 * Lengths of configuration options.
273 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
274 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
275 #define CILEN_ADDR 6 /* new-style single address option */
276 #define CILEN_ADDRS 10 /* old-style dual address option */
279 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
280 (x) == CONFNAK ? "NAK" : "REJ")
283 * This state variable is used to ensure that we don't
284 * run an ipcp-up/down script while one is already running.
286 static enum script_state {
290 static pid_t ipcp_script_pid;
293 * Make a string representation of a network IP address.
301 slprintf(b, sizeof(b), "%I", ipaddr);
310 * setvjslots - set maximum number of connection slots for VJ compression
318 if (!int_option(*argv, &value))
320 if (value < 2 || value > 16) {
321 option_error("vj-max-slots value must be between 2 and 16");
324 ipcp_wantoptions [0].maxslotindex =
325 ipcp_allowoptions[0].maxslotindex = value - 1;
326 slprintf(vj_value, sizeof(vj_value), "%d", value);
331 * setdnsaddr - set the dns address(es)
340 dns = inet_addr(*argv);
341 if (dns == (u_int32_t) -1) {
342 if ((hp = gethostbyname(*argv)) == NULL) {
343 option_error("invalid address parameter '%s' for ms-dns option",
347 dns = *(u_int32_t *)hp->h_addr;
350 /* We take the last 2 values given, the 2nd-last as the primary
351 and the last as the secondary. If only one is given it
352 becomes both primary and secondary. */
353 if (ipcp_allowoptions[0].dnsaddr[1] == 0)
354 ipcp_allowoptions[0].dnsaddr[0] = dns;
356 ipcp_allowoptions[0].dnsaddr[0] = ipcp_allowoptions[0].dnsaddr[1];
358 /* always set the secondary address value. */
359 ipcp_allowoptions[0].dnsaddr[1] = dns;
365 * setwinsaddr - set the wins address(es)
366 * This is primrarly used with the Samba package under UNIX or for pointing
367 * the caller to the existing WINS server on a Windows NT platform.
376 wins = inet_addr(*argv);
377 if (wins == (u_int32_t) -1) {
378 if ((hp = gethostbyname(*argv)) == NULL) {
379 option_error("invalid address parameter '%s' for ms-wins option",
383 wins = *(u_int32_t *)hp->h_addr;
386 /* We take the last 2 values given, the 2nd-last as the primary
387 and the last as the secondary. If only one is given it
388 becomes both primary and secondary. */
389 if (ipcp_allowoptions[0].winsaddr[1] == 0)
390 ipcp_allowoptions[0].winsaddr[0] = wins;
392 ipcp_allowoptions[0].winsaddr[0] = ipcp_allowoptions[0].winsaddr[1];
394 /* always set the secondary address value. */
395 ipcp_allowoptions[0].winsaddr[1] = wins;
401 * setipaddr - Set the IP address
402 * If doit is 0, the call is to check whether this option is
403 * potentially an IP address specification.
404 * Not static so that plugins can call it to set the addresses
407 setipaddr(arg, argv, doit)
414 u_int32_t local, remote;
415 ipcp_options *wo = &ipcp_wantoptions[0];
416 static int prio_local = 0, prio_remote = 0;
419 * IP address pair separated by ":".
421 if ((colon = strchr(arg, ':')) == NULL)
427 * If colon first character, then no local addr.
429 if (colon != arg && option_priority >= prio_local) {
431 if ((local = inet_addr(arg)) == (u_int32_t) -1) {
432 if ((hp = gethostbyname(arg)) == NULL) {
433 option_error("unknown host: %s", arg);
436 local = *(u_int32_t *)hp->h_addr;
438 if (bad_ip_adrs(local)) {
439 option_error("bad local IP address %s", ip_ntoa(local));
445 prio_local = option_priority;
449 * If colon last character, then no remote addr.
451 if (*++colon != '\0' && option_priority >= prio_remote) {
452 if ((remote = inet_addr(colon)) == (u_int32_t) -1) {
453 if ((hp = gethostbyname(colon)) == NULL) {
454 option_error("unknown host: %s", colon);
457 remote = *(u_int32_t *)hp->h_addr;
458 if (remote_name[0] == 0)
459 strlcpy(remote_name, colon, sizeof(remote_name));
461 if (bad_ip_adrs(remote)) {
462 option_error("bad remote IP address %s", ip_ntoa(remote));
466 wo->hisaddr = remote;
467 prio_remote = option_priority;
474 printipaddr(opt, printer, arg)
476 void (*printer) __P((void *, char *, ...));
479 ipcp_options *wo = &ipcp_wantoptions[0];
481 if (wo->ouraddr != 0)
482 printer(arg, "%I", wo->ouraddr);
484 if (wo->hisaddr != 0)
485 printer(arg, "%I", wo->hisaddr);
489 * setnetmask - set the netmask to be used on the interface.
500 * Unfortunately, if we use inet_addr, we can't tell whether
501 * a result of all 1s is an error or a valid 255.255.255.255.
504 n = parse_dotted_ip(p, &mask);
508 if (n == 0 || p[n] != 0 || (netmask & ~mask) != 0) {
509 option_error("invalid netmask value '%s'", *argv);
514 slprintf(netmask_str, sizeof(netmask_str), "%I", mask);
520 parse_dotted_ip(p, vp)
530 b = strtoul(p, &endp, 0);
536 /* accept e.g. 0xffffff00 */
554 * ipcp_init - Initialize IPCP.
560 fsm *f = &ipcp_fsm[unit];
561 ipcp_options *wo = &ipcp_wantoptions[unit];
562 ipcp_options *ao = &ipcp_allowoptions[unit];
565 f->protocol = PPP_IPCP;
566 f->callbacks = &ipcp_callbacks;
567 fsm_init(&ipcp_fsm[unit]);
569 memset(wo, 0, sizeof(*wo));
570 memset(ao, 0, sizeof(*ao));
572 wo->neg_addr = wo->old_addrs = 1;
574 wo->vj_protocol = IPCP_VJ_COMP;
575 wo->maxslotindex = MAX_STATES - 1; /* really max index */
579 /* max slots and slot-id compression are currently hardwired in */
580 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
583 ao->neg_addr = ao->old_addrs = 1;
585 ao->maxslotindex = MAX_STATES - 1;
589 * XXX These control whether the user may use the proxyarp
590 * and defaultroute options.
593 ao->default_route = 1;
598 * ipcp_open - IPCP is allowed to come up.
604 fsm_open(&ipcp_fsm[unit]);
609 * ipcp_close - Take IPCP down.
612 ipcp_close(unit, reason)
616 fsm_close(&ipcp_fsm[unit], reason);
621 * ipcp_lowerup - The lower layer is up.
627 fsm_lowerup(&ipcp_fsm[unit]);
632 * ipcp_lowerdown - The lower layer is down.
638 fsm_lowerdown(&ipcp_fsm[unit]);
643 * ipcp_input - Input IPCP packet.
646 ipcp_input(unit, p, len)
651 fsm_input(&ipcp_fsm[unit], p, len);
656 * ipcp_protrej - A Protocol-Reject was received for IPCP.
658 * Pretend the lower layer went down, so we shut up.
664 fsm_lowerdown(&ipcp_fsm[unit]);
669 * ipcp_resetci - Reset our CI.
670 * Called by fsm_sconfreq, Send Configure Request.
676 ipcp_options *wo = &ipcp_wantoptions[f->unit];
677 ipcp_options *go = &ipcp_gotoptions[f->unit];
678 ipcp_options *ao = &ipcp_allowoptions[f->unit];
680 wo->req_addr = (wo->neg_addr || wo->old_addrs) &&
681 (ao->neg_addr || ao->old_addrs);
682 if (wo->ouraddr == 0)
683 wo->accept_local = 1;
684 if (wo->hisaddr == 0)
685 wo->accept_remote = 1;
686 wo->req_dns1 = usepeerdns; /* Request DNS addresses from the peer */
687 wo->req_dns2 = usepeerdns;
691 if (ip_choose_hook) {
692 ip_choose_hook(&wo->hisaddr);
694 wo->accept_remote = 0;
701 * ipcp_cilen - Return length of our CI.
702 * Called by fsm_sconfreq, Send Configure Request.
708 ipcp_options *go = &ipcp_gotoptions[f->unit];
709 ipcp_options *wo = &ipcp_wantoptions[f->unit];
710 ipcp_options *ho = &ipcp_hisoptions[f->unit];
712 #define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0)
713 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
714 #define LENCIADDR(neg) (neg ? CILEN_ADDR : 0)
715 #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
718 * First see if we want to change our options to the old
719 * forms because we have received old forms from the peer.
721 if ((wo->neg_addr || wo->old_addrs) && !go->neg_addr && !go->old_addrs) {
722 /* use the old style of address negotiation */
725 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
726 /* try an older style of VJ negotiation */
727 /* use the old style only if the peer did */
728 if (ho->neg_vj && ho->old_vj) {
731 go->vj_protocol = ho->vj_protocol;
735 return (LENCIADDRS(!go->neg_addr && go->old_addrs) +
736 LENCIVJ(go->neg_vj, go->old_vj) +
737 LENCIADDR(go->neg_addr) +
738 LENCIDNS(go->req_dns1) +
739 LENCIDNS(go->req_dns2)) ;
744 * ipcp_addci - Add our desired CIs to a packet.
745 * Called by fsm_sconfreq, Send Configure Request.
748 ipcp_addci(f, ucp, lenp)
753 ipcp_options *go = &ipcp_gotoptions[f->unit];
756 #define ADDCIADDRS(opt, neg, val1, val2) \
758 if (len >= CILEN_ADDRS) { \
761 PUTCHAR(CILEN_ADDRS, ucp); \
766 len -= CILEN_ADDRS; \
771 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
773 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
774 if (len >= vjlen) { \
776 PUTCHAR(vjlen, ucp); \
777 PUTSHORT(val, ucp); \
779 PUTCHAR(maxslotindex, ucp); \
780 PUTCHAR(cflag, ucp); \
787 #define ADDCIADDR(opt, neg, val) \
789 if (len >= CILEN_ADDR) { \
792 PUTCHAR(CILEN_ADDR, ucp); \
800 #define ADDCIDNS(opt, neg, addr) \
802 if (len >= CILEN_ADDR) { \
805 PUTCHAR(CILEN_ADDR, ucp); \
813 ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
816 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
817 go->maxslotindex, go->cflag);
819 ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
821 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
823 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
830 * ipcp_ackci - Ack our CIs.
831 * Called by fsm_rconfack, Receive Configure ACK.
838 ipcp_ackci(f, p, len)
843 ipcp_options *go = &ipcp_gotoptions[f->unit];
844 u_short cilen, citype, cishort;
846 u_char cimaxslotindex, cicflag;
849 * CIs must be in exactly the same order that we sent...
850 * Check packet length and CI length at each step.
851 * If we find any deviations, then this packet is bad.
854 #define ACKCIADDRS(opt, neg, val1, val2) \
857 if ((len -= CILEN_ADDRS) < 0) \
859 GETCHAR(citype, p); \
861 if (cilen != CILEN_ADDRS || \
866 if (val1 != cilong) \
870 if (val2 != cilong) \
874 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
876 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
877 if ((len -= vjlen) < 0) \
879 GETCHAR(citype, p); \
881 if (cilen != vjlen || \
884 GETSHORT(cishort, p); \
885 if (cishort != val) \
888 GETCHAR(cimaxslotindex, p); \
889 if (cimaxslotindex != maxslotindex) \
891 GETCHAR(cicflag, p); \
892 if (cicflag != cflag) \
897 #define ACKCIADDR(opt, neg, val) \
900 if ((len -= CILEN_ADDR) < 0) \
902 GETCHAR(citype, p); \
904 if (cilen != CILEN_ADDR || \
913 #define ACKCIDNS(opt, neg, addr) \
916 if ((len -= CILEN_ADDR) < 0) \
918 GETCHAR(citype, p); \
920 if (cilen != CILEN_ADDR || citype != opt) \
924 if (addr != cilong) \
928 ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
931 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
932 go->maxslotindex, go->cflag);
934 ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
936 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
938 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
941 * If there are any remaining CIs, then this packet is bad.
948 IPCPDEBUG(("ipcp_ackci: received bad Ack!"));
953 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
954 * This should not modify any state if the Nak is bad
955 * or if IPCP is in the OPENED state.
956 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
963 ipcp_nakci(f, p, len)
968 ipcp_options *go = &ipcp_gotoptions[f->unit];
969 u_char cimaxslotindex, cicflag;
970 u_char citype, cilen, *next;
972 u_int32_t ciaddr1, ciaddr2, l, cidnsaddr;
973 ipcp_options no; /* options we've seen Naks for */
974 ipcp_options try; /* options to request next time */
976 BZERO(&no, sizeof(no));
980 * Any Nak'd CIs must be in exactly the same order that we sent.
981 * Check packet length and CI length at each step.
982 * If we find any deviations, then this packet is bad.
984 #define NAKCIADDRS(opt, neg, code) \
986 (cilen = p[1]) == CILEN_ADDRS && \
992 ciaddr1 = htonl(l); \
994 ciaddr2 = htonl(l); \
999 #define NAKCIVJ(opt, neg, code) \
1001 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
1006 GETSHORT(cishort, p); \
1011 #define NAKCIADDR(opt, neg, code) \
1013 (cilen = p[1]) == CILEN_ADDR && \
1019 ciaddr1 = htonl(l); \
1024 #define NAKCIDNS(opt, neg, code) \
1026 ((cilen = p[1]) == CILEN_ADDR) && \
1032 cidnsaddr = htonl(l); \
1038 * Accept the peer's idea of {our,his} address, if different
1039 * from our idea, only if the accept_{local,remote} flag is set.
1041 NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1042 if (go->accept_local && ciaddr1) { /* Do we know our address? */
1043 try.ouraddr = ciaddr1;
1045 if (go->accept_remote && ciaddr2) { /* Does he know his? */
1046 try.hisaddr = ciaddr2;
1051 * Accept the peer's value of maxslotindex provided that it
1052 * is less than what we asked for. Turn off slot-ID compression
1053 * if the peer wants. Send old-style compress-type option if
1056 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
1057 if (cilen == CILEN_VJ) {
1058 GETCHAR(cimaxslotindex, p);
1059 GETCHAR(cicflag, p);
1060 if (cishort == IPCP_VJ_COMP) {
1062 if (cimaxslotindex < go->maxslotindex)
1063 try.maxslotindex = cimaxslotindex;
1070 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
1072 try.vj_protocol = cishort;
1079 NAKCIADDR(CI_ADDR, neg_addr,
1080 if (go->accept_local && ciaddr1) { /* Do we know our address? */
1081 try.ouraddr = ciaddr1;
1085 NAKCIDNS(CI_MS_DNS1, req_dns1,
1086 try.dnsaddr[0] = cidnsaddr;
1089 NAKCIDNS(CI_MS_DNS2, req_dns2,
1090 try.dnsaddr[1] = cidnsaddr;
1094 * There may be remaining CIs, if the peer is requesting negotiation
1095 * on an option that we didn't include in our request packet.
1096 * If they want to negotiate about IP addresses, we comply.
1097 * If they want us to ask for compression, we refuse.
1099 while (len > CILEN_VOID) {
1102 if( (len -= cilen) < 0 )
1104 next = p + cilen - 2;
1107 case CI_COMPRESSTYPE:
1108 if (go->neg_vj || no.neg_vj ||
1109 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
1114 if ((!go->neg_addr && go->old_addrs) || no.old_addrs
1115 || cilen != CILEN_ADDRS)
1120 if (ciaddr1 && go->accept_local)
1121 try.ouraddr = ciaddr1;
1124 if (ciaddr2 && go->accept_remote)
1125 try.hisaddr = ciaddr2;
1129 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
1134 if (ciaddr1 && go->accept_local)
1135 try.ouraddr = ciaddr1;
1136 if (try.ouraddr != 0)
1145 * OK, the Nak is good. Now we can update state.
1146 * If there are any remaining options, we ignore them.
1148 if (f->state != OPENED)
1154 IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
1160 * ipcp_rejci - Reject some of our CIs.
1161 * Callback from fsm_rconfnakrej.
1164 ipcp_rejci(f, p, len)
1169 ipcp_options *go = &ipcp_gotoptions[f->unit];
1170 u_char cimaxslotindex, ciflag, cilen;
1173 ipcp_options try; /* options to request next time */
1177 * Any Rejected CIs must be in exactly the same order that we sent.
1178 * Check packet length and CI length at each step.
1179 * If we find any deviations, then this packet is bad.
1181 #define REJCIADDRS(opt, neg, val1, val2) \
1183 (cilen = p[1]) == CILEN_ADDRS && \
1190 cilong = htonl(l); \
1191 /* Check rejected value. */ \
1192 if (cilong != val1) \
1195 cilong = htonl(l); \
1196 /* Check rejected value. */ \
1197 if (cilong != val2) \
1199 try.old_addrs = 0; \
1202 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
1204 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
1209 GETSHORT(cishort, p); \
1210 /* Check rejected value. */ \
1211 if (cishort != val) \
1214 GETCHAR(cimaxslotindex, p); \
1215 if (cimaxslotindex != maxslot) \
1217 GETCHAR(ciflag, p); \
1218 if (ciflag != cflag) \
1224 #define REJCIADDR(opt, neg, val) \
1226 (cilen = p[1]) == CILEN_ADDR && \
1233 cilong = htonl(l); \
1234 /* Check rejected value. */ \
1235 if (cilong != val) \
1240 #define REJCIDNS(opt, neg, dnsaddr) \
1242 ((cilen = p[1]) == CILEN_ADDR) && \
1249 cilong = htonl(l); \
1250 /* Check rejected value. */ \
1251 if (cilong != dnsaddr) \
1257 REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1258 go->ouraddr, go->hisaddr);
1260 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
1261 go->maxslotindex, go->cflag);
1263 REJCIADDR(CI_ADDR, neg_addr, go->ouraddr);
1265 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
1267 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
1270 * If there are any remaining CIs, then this packet is bad.
1275 * Now we can update state.
1277 if (f->state != OPENED)
1282 IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
1288 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
1289 * Callback from fsm_rconfreq, Receive Configure Request
1291 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1292 * appropriately. If reject_if_disagree is non-zero, doesn't return
1293 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1296 ipcp_reqci(f, inp, len, reject_if_disagree)
1298 u_char *inp; /* Requested CIs */
1299 int *len; /* Length of requested CIs */
1300 int reject_if_disagree;
1302 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1303 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1304 ipcp_options *ao = &ipcp_allowoptions[f->unit];
1305 u_char *cip, *next; /* Pointer to current and next CIs */
1306 u_short cilen, citype; /* Parsed len, type */
1307 u_short cishort; /* Parsed short value */
1308 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
1309 int rc = CONFACK; /* Final packet return code */
1310 int orc; /* Individual option return code */
1311 u_char *p; /* Pointer to next char to parse */
1312 u_char *ucp = inp; /* Pointer to current output char */
1313 int l = *len; /* Length left */
1314 u_char maxslotindex, cflag;
1318 * Reset all his options.
1320 BZERO(ho, sizeof(*ho));
1323 * Process all his options.
1327 orc = CONFACK; /* Assume success */
1328 cip = p = next; /* Remember begining of CI */
1329 if (l < 2 || /* Not enough data for CI header or */
1330 p[1] < 2 || /* CI length too small or */
1331 p[1] > l) { /* CI length too big? */
1332 IPCPDEBUG(("ipcp_reqci: bad CI length!"));
1333 orc = CONFREJ; /* Reject bad CI */
1334 cilen = l; /* Reject till end of packet */
1335 l = 0; /* Don't loop again */
1338 GETCHAR(citype, p); /* Parse CI type */
1339 GETCHAR(cilen, p); /* Parse CI length */
1340 l -= cilen; /* Adjust remaining length */
1341 next += cilen; /* Step to next CI */
1343 switch (citype) { /* Check CI type */
1345 if (!ao->old_addrs || ho->neg_addr ||
1346 cilen != CILEN_ADDRS) { /* Check CI length */
1347 orc = CONFREJ; /* Reject CI */
1352 * If he has no address, or if we both have his address but
1353 * disagree about it, then NAK it with our idea.
1354 * In particular, if we don't know his address, but he does,
1357 GETLONG(tl, p); /* Parse source address (his) */
1358 ciaddr1 = htonl(tl);
1359 if (ciaddr1 != wo->hisaddr
1360 && (ciaddr1 == 0 || !wo->accept_remote)) {
1362 if (!reject_if_disagree) {
1363 DECPTR(sizeof(u_int32_t), p);
1364 tl = ntohl(wo->hisaddr);
1367 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1369 * If neither we nor he knows his address, reject the option.
1372 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1377 * If he doesn't know our address, or if we both have our address
1378 * but disagree about it, then NAK it with our idea.
1380 GETLONG(tl, p); /* Parse desination address (ours) */
1381 ciaddr2 = htonl(tl);
1382 if (ciaddr2 != wo->ouraddr) {
1383 if (ciaddr2 == 0 || !wo->accept_local) {
1385 if (!reject_if_disagree) {
1386 DECPTR(sizeof(u_int32_t), p);
1387 tl = ntohl(wo->ouraddr);
1391 wo->ouraddr = ciaddr2; /* accept peer's idea */
1396 ho->hisaddr = ciaddr1;
1397 ho->ouraddr = ciaddr2;
1401 if (!ao->neg_addr || ho->old_addrs ||
1402 cilen != CILEN_ADDR) { /* Check CI length */
1403 orc = CONFREJ; /* Reject CI */
1408 * If he has no address, or if we both have his address but
1409 * disagree about it, then NAK it with our idea.
1410 * In particular, if we don't know his address, but he does,
1413 GETLONG(tl, p); /* Parse source address (his) */
1414 ciaddr1 = htonl(tl);
1415 if (ciaddr1 != wo->hisaddr
1416 && (ciaddr1 == 0 || !wo->accept_remote)) {
1418 if (!reject_if_disagree) {
1419 DECPTR(sizeof(u_int32_t), p);
1420 tl = ntohl(wo->hisaddr);
1423 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1425 * Don't ACK an address of 0.0.0.0 - reject it instead.
1428 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1433 ho->hisaddr = ciaddr1;
1438 /* Microsoft primary or secondary DNS request */
1439 d = citype == CI_MS_DNS2;
1441 /* If we do not have a DNS address then we cannot send it */
1442 if (ao->dnsaddr[d] == 0 ||
1443 cilen != CILEN_ADDR) { /* Check CI length */
1444 orc = CONFREJ; /* Reject CI */
1448 if (htonl(tl) != ao->dnsaddr[d]) {
1449 DECPTR(sizeof(u_int32_t), p);
1450 tl = ntohl(ao->dnsaddr[d]);
1458 /* Microsoft primary or secondary WINS request */
1459 d = citype == CI_MS_WINS2;
1461 /* If we do not have a DNS address then we cannot send it */
1462 if (ao->winsaddr[d] == 0 ||
1463 cilen != CILEN_ADDR) { /* Check CI length */
1464 orc = CONFREJ; /* Reject CI */
1468 if (htonl(tl) != ao->winsaddr[d]) {
1469 DECPTR(sizeof(u_int32_t), p);
1470 tl = ntohl(ao->winsaddr[d]);
1476 case CI_COMPRESSTYPE:
1478 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
1482 GETSHORT(cishort, p);
1484 if (!(cishort == IPCP_VJ_COMP ||
1485 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1491 ho->vj_protocol = cishort;
1492 if (cilen == CILEN_VJ) {
1493 GETCHAR(maxslotindex, p);
1494 if (maxslotindex > ao->maxslotindex) {
1496 if (!reject_if_disagree){
1498 PUTCHAR(ao->maxslotindex, p);
1502 if (cflag && !ao->cflag) {
1504 if (!reject_if_disagree){
1506 PUTCHAR(wo->cflag, p);
1509 ho->maxslotindex = maxslotindex;
1513 ho->maxslotindex = MAX_STATES - 1;
1523 if (orc == CONFACK && /* Good CI */
1524 rc != CONFACK) /* but prior CI wasnt? */
1525 continue; /* Don't send this one */
1527 if (orc == CONFNAK) { /* Nak this CI? */
1528 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1529 orc = CONFREJ; /* Get tough if so */
1531 if (rc == CONFREJ) /* Rejecting prior CI? */
1532 continue; /* Don't send this one */
1533 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1534 rc = CONFNAK; /* Not anymore... */
1535 ucp = inp; /* Backup */
1540 if (orc == CONFREJ && /* Reject this CI */
1541 rc != CONFREJ) { /* but no prior ones? */
1543 ucp = inp; /* Backup */
1546 /* Need to move CI? */
1548 BCOPY(cip, ucp, cilen); /* Move it */
1550 /* Update output pointer */
1555 * If we aren't rejecting this packet, and we want to negotiate
1556 * their address, and they didn't send their address, then we
1557 * send a NAK with a CI_ADDR option appended. We assume the
1558 * input buffer is long enough that we can append the extra
1561 if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs &&
1562 wo->req_addr && !reject_if_disagree) {
1563 if (rc == CONFACK) {
1565 ucp = inp; /* reset pointer */
1566 wo->req_addr = 0; /* don't ask again */
1568 PUTCHAR(CI_ADDR, ucp);
1569 PUTCHAR(CILEN_ADDR, ucp);
1570 tl = ntohl(wo->hisaddr);
1574 *len = ucp - inp; /* Compute output length */
1575 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
1576 return (rc); /* Return final code */
1581 * ip_check_options - check that any IP-related options are OK,
1582 * and assign appropriate defaults.
1589 ipcp_options *wo = &ipcp_wantoptions[0];
1592 * Default our local IP address based on our hostname.
1593 * If local IP address already given, don't bother.
1595 if (wo->ouraddr == 0 && !disable_defaultip) {
1597 * Look up our hostname (possibly with domain name appended)
1598 * and take the first IP address as our local IP address.
1599 * If there isn't an IP address for our hostname, too bad.
1601 wo->accept_local = 1; /* don't insist on this default value */
1602 if ((hp = gethostbyname(hostname)) != NULL) {
1603 local = *(u_int32_t *)hp->h_addr;
1604 if (local != 0 && !bad_ip_adrs(local))
1605 wo->ouraddr = local;
1608 ask_for_local = wo->ouraddr != 0 || !disable_defaultip;
1613 * ip_demand_conf - configure the interface as though
1614 * IPCP were up, for use with dial-on-demand.
1620 ipcp_options *wo = &ipcp_wantoptions[u];
1622 if (wo->hisaddr == 0) {
1623 /* make up an arbitrary address for the peer */
1624 wo->hisaddr = htonl(0x0a707070 + ifunit);
1625 wo->accept_remote = 1;
1627 if (wo->ouraddr == 0) {
1628 /* make up an arbitrary address for us */
1629 wo->ouraddr = htonl(0x0a404040 + ifunit);
1630 wo->accept_local = 1;
1631 ask_for_local = 0; /* don't tell the peer this address */
1633 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1637 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1639 if (wo->default_route)
1640 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1641 default_route_set[u] = 1;
1643 if (sifproxyarp(u, wo->hisaddr))
1644 proxy_arp_set[u] = 1;
1646 notice("local IP address %I", wo->ouraddr);
1647 notice("remote IP address %I", wo->hisaddr);
1654 * ipcp_up - IPCP has come UP.
1656 * Configure the IP network interface appropriately and bring it up.
1663 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1664 ipcp_options *go = &ipcp_gotoptions[f->unit];
1665 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1667 IPCPDEBUG(("ipcp: up"));
1670 * We must have a non-zero IP address for both ends of the link.
1672 if (!ho->neg_addr && !ho->old_addrs)
1673 ho->hisaddr = wo->hisaddr;
1675 if (go->ouraddr == 0) {
1676 error("Could not determine local IP address");
1677 ipcp_close(f->unit, "Could not determine local IP address");
1680 if (ho->hisaddr == 0) {
1681 ho->hisaddr = htonl(0x0a404040 + ifunit);
1682 warn("Could not determine remote IP address: defaulting to %I",
1685 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
1686 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
1688 if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1689 script_setenv("USEPEERDNS", "1", 0);
1691 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
1693 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
1694 create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
1698 * Check that the peer is allowed to use the IP address it wants.
1700 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1701 error("Peer is not authorized to use remote address %I", ho->hisaddr);
1702 ipcp_close(f->unit, "Unauthorized remote IP address");
1706 /* set tcp compression */
1707 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1710 * If we are doing dial-on-demand, the interface is already
1711 * configured, so we put out any saved-up packets, then set the
1712 * interface to pass IP packets.
1715 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1716 ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
1717 if (go->ouraddr != wo->ouraddr) {
1718 warn("Local IP address changed to %I", go->ouraddr);
1719 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
1720 wo->ouraddr = go->ouraddr;
1722 script_unsetenv("OLDIPLOCAL");
1723 if (ho->hisaddr != wo->hisaddr) {
1724 warn("Remote IP address changed to %I", ho->hisaddr);
1725 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0);
1726 wo->hisaddr = ho->hisaddr;
1728 script_unsetenv("OLDIPREMOTE");
1730 /* Set the interface to the new addresses */
1731 mask = GetMask(go->ouraddr);
1732 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1734 warn("Interface configuration failed");
1735 ipcp_close(f->unit, "Interface configuration failed");
1739 /* assign a default route through the interface if required */
1740 if (ipcp_wantoptions[f->unit].default_route)
1741 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1742 default_route_set[f->unit] = 1;
1744 /* Make a proxy ARP entry if requested. */
1745 if (ipcp_wantoptions[f->unit].proxy_arp)
1746 if (sifproxyarp(f->unit, ho->hisaddr))
1747 proxy_arp_set[f->unit] = 1;
1750 demand_rexmit(PPP_IP);
1751 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1755 * Set IP addresses and (if specified) netmask.
1757 mask = GetMask(go->ouraddr);
1759 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1760 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1762 warn("Interface configuration failed");
1763 ipcp_close(f->unit, "Interface configuration failed");
1768 /* bring the interface up for IP */
1769 if (!sifup(f->unit)) {
1771 warn("Interface failed to come up");
1772 ipcp_close(f->unit, "Interface configuration failed");
1776 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1777 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1779 warn("Interface configuration failed");
1780 ipcp_close(f->unit, "Interface configuration failed");
1784 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1786 /* assign a default route through the interface if required */
1787 if (ipcp_wantoptions[f->unit].default_route)
1788 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1789 default_route_set[f->unit] = 1;
1791 /* Make a proxy ARP entry if requested. */
1792 if (ipcp_wantoptions[f->unit].proxy_arp)
1793 if (sifproxyarp(f->unit, ho->hisaddr))
1794 proxy_arp_set[f->unit] = 1;
1796 ipcp_wantoptions[0].ouraddr = go->ouraddr;
1798 notice("local IP address %I", go->ouraddr);
1799 notice("remote IP address %I", ho->hisaddr);
1801 notice("primary DNS address %I", go->dnsaddr[0]);
1803 notice("secondary DNS address %I", go->dnsaddr[1]);
1806 np_up(f->unit, PPP_IP);
1809 notify(ip_up_notifier, 0);
1814 * Execute the ip-up script, like this:
1815 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1817 if (ipcp_script_state == s_down && ipcp_script_pid == 0) {
1818 ipcp_script_state = s_up;
1819 ipcp_script(_PATH_IPUP);
1825 * ipcp_down - IPCP has gone DOWN.
1827 * Take the IP network interface down, clear its addresses
1828 * and delete routes through it.
1834 IPCPDEBUG(("ipcp: down"));
1835 /* XXX a bit IPv4-centric here, we only need to get the stats
1836 * before the interface is marked down. */
1837 update_link_stats(f->unit);
1838 notify(ip_down_notifier, 0);
1843 np_down(f->unit, PPP_IP);
1845 sifvjcomp(f->unit, 0, 0, 0);
1848 * If we are doing dial-on-demand, set the interface
1849 * to queue up outgoing packets (for now).
1852 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1854 sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
1856 ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
1857 ipcp_hisoptions[f->unit].hisaddr);
1860 /* Execute the ip-down script */
1861 if (ipcp_script_state == s_up && ipcp_script_pid == 0) {
1862 ipcp_script_state = s_down;
1863 ipcp_script(_PATH_IPDOWN);
1869 * ipcp_clear_addrs() - clear the interface addresses, routes,
1870 * proxy arp entries, etc.
1873 ipcp_clear_addrs(unit, ouraddr, hisaddr)
1875 u_int32_t ouraddr; /* local address */
1876 u_int32_t hisaddr; /* remote address */
1878 if (proxy_arp_set[unit]) {
1879 cifproxyarp(unit, hisaddr);
1880 proxy_arp_set[unit] = 0;
1882 if (default_route_set[unit]) {
1883 cifdefaultroute(unit, ouraddr, hisaddr);
1884 default_route_set[unit] = 0;
1886 cifaddr(unit, ouraddr, hisaddr);
1891 * ipcp_finished - possibly shut down the lower layers.
1897 np_finished(f->unit, PPP_IP);
1902 * ipcp_script_done - called when the ip-up or ip-down script
1906 ipcp_script_done(arg)
1909 ipcp_script_pid = 0;
1910 switch (ipcp_script_state) {
1912 if (ipcp_fsm[0].state != OPENED) {
1913 ipcp_script_state = s_down;
1914 ipcp_script(_PATH_IPDOWN);
1918 if (ipcp_fsm[0].state == OPENED) {
1919 ipcp_script_state = s_up;
1920 ipcp_script(_PATH_IPUP);
1928 * ipcp_script - Execute a script with arguments
1929 * interface-name tty-name speed local-IP remote-IP.
1935 char strspeed[32], strlocal[32], strremote[32];
1938 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
1939 slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr);
1940 slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr);
1947 argv[5] = strremote;
1950 ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, NULL);
1954 * create_resolv - create the replacement resolv.conf file
1957 create_resolv(peerdns1, peerdns2)
1958 u_int32_t peerdns1, peerdns2;
1962 f = fopen(_PATH_RESOLV, "w");
1964 error("Failed to create %s: %m", _PATH_RESOLV);
1969 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1));
1972 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2));
1975 error("Write failed to %s: %m", _PATH_RESOLV);
1981 * ipcp_printpkt - print the contents of an IPCP packet.
1983 static char *ipcp_codenames[] = {
1984 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1985 "TermReq", "TermAck", "CodeRej"
1989 ipcp_printpkt(p, plen, printer, arg)
1992 void (*printer) __P((void *, char *, ...));
1995 int code, id, len, olen;
1996 u_char *pstart, *optend;
2000 if (plen < HEADERLEN)
2006 if (len < HEADERLEN || len > plen)
2009 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
2010 printer(arg, " %s", ipcp_codenames[code-1]);
2012 printer(arg, " code=0x%x", code);
2013 printer(arg, " id=0x%x", id);
2020 /* print option list */
2025 if (olen < 2 || olen > len) {
2033 if (olen == CILEN_ADDRS) {
2036 printer(arg, "addrs %I", htonl(cilong));
2038 printer(arg, " %I", htonl(cilong));
2041 case CI_COMPRESSTYPE:
2042 if (olen >= CILEN_COMPRESS) {
2044 GETSHORT(cishort, p);
2045 printer(arg, "compress ");
2050 case IPCP_VJ_COMP_OLD:
2051 printer(arg, "old-VJ");
2054 printer(arg, "0x%x", cishort);
2059 if (olen == CILEN_ADDR) {
2062 printer(arg, "addr %I", htonl(cilong));
2069 printer(arg, "ms-dns%d %I", code - CI_MS_DNS1 + 1,
2076 printer(arg, "ms-wins %I", htonl(cilong));
2079 while (p < optend) {
2081 printer(arg, " %.2x", code);
2089 if (len > 0 && *p >= ' ' && *p < 0x7f) {
2091 print_string((char *)p, len, printer, arg);
2098 /* print the rest of the bytes in the packet */
2099 for (; len > 0; --len) {
2101 printer(arg, " %.2x", code);
2108 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
2109 * We don't bring the link up for IP fragments or for TCP FIN packets
2112 #define IP_HDRLEN 20 /* bytes */
2113 #define IP_OFFMASK 0x1fff
2115 #define IPPROTO_TCP 6
2117 #define TCP_HDRLEN 20
2121 * We use these macros because the IP header may be at an odd address,
2122 * and some compilers might use word loads to get th_off or ip_hl.
2125 #define net_short(x) (((x)[0] << 8) + (x)[1])
2126 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
2127 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
2128 #define get_ipproto(x) (((unsigned char *)(x))[9])
2129 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
2130 #define get_tcpflags(x) (((unsigned char *)(x))[13])
2133 ip_active_pkt(pkt, len)
2142 if (len < IP_HDRLEN)
2144 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
2146 if (get_ipproto(pkt) != IPPROTO_TCP)
2148 hlen = get_iphl(pkt) * 4;
2149 if (len < hlen + TCP_HDRLEN)
2152 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)