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 1.68 2004/11/13 02:28:15 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 int ipcp_is_open; /* haven't called np_finished() */
95 static bool ask_for_local; /* request our address from peer */
96 static char vj_value[8]; /* string form of vj option value */
97 static char netmask_str[20]; /* string form of netmask value */
100 * Callbacks for fsm code. (CI = Configuration Information)
102 static void ipcp_resetci __P((fsm *)); /* Reset our CI */
103 static int ipcp_cilen __P((fsm *)); /* Return length of our CI */
104 static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
105 static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
106 static int ipcp_nakci __P((fsm *, u_char *, int, int));/* Peer nak'd our CI */
107 static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
108 static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
109 static void ipcp_up __P((fsm *)); /* We're UP */
110 static void ipcp_down __P((fsm *)); /* We're DOWN */
111 static void ipcp_finished __P((fsm *)); /* Don't need lower layer */
113 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
115 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
116 ipcp_resetci, /* Reset our Configuration Information */
117 ipcp_cilen, /* Length of our Configuration Information */
118 ipcp_addci, /* Add our Configuration Information */
119 ipcp_ackci, /* ACK our Configuration Information */
120 ipcp_nakci, /* NAK our Configuration Information */
121 ipcp_rejci, /* Reject our Configuration Information */
122 ipcp_reqci, /* Request peer's Configuration Information */
123 ipcp_up, /* Called when fsm reaches OPENED state */
124 ipcp_down, /* Called when fsm leaves OPENED state */
125 NULL, /* Called when we want the lower layer up */
126 ipcp_finished, /* Called when we want the lower layer down */
127 NULL, /* Called when Protocol-Reject received */
128 NULL, /* Retransmission is necessary */
129 NULL, /* Called to handle protocol-specific codes */
130 "IPCP" /* String name of protocol */
134 * Command-line options.
136 static int setvjslots __P((char **));
137 static int setdnsaddr __P((char **));
138 static int setwinsaddr __P((char **));
139 static int setnetmask __P((char **));
140 int setipaddr __P((char *, char **, int));
141 static void printipaddr __P((option_t *, void (*)(void *, char *,...),void *));
143 static option_t ipcp_option_list[] = {
144 { "noip", o_bool, &ipcp_protent.enabled_flag,
145 "Disable IP and IPCP" },
146 { "-ip", o_bool, &ipcp_protent.enabled_flag,
147 "Disable IP and IPCP", OPT_ALIAS },
149 { "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
150 "Disable VJ compression", OPT_A2CLR, &ipcp_allowoptions[0].neg_vj },
151 { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
152 "Disable VJ compression", OPT_ALIAS | OPT_A2CLR,
153 &ipcp_allowoptions[0].neg_vj },
155 { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
156 "Disable VJ connection-ID compression", OPT_A2CLR,
157 &ipcp_allowoptions[0].cflag },
158 { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
159 "Disable VJ connection-ID compression", OPT_ALIAS | OPT_A2CLR,
160 &ipcp_allowoptions[0].cflag },
162 { "vj-max-slots", o_special, (void *)setvjslots,
163 "Set maximum VJ header slots",
164 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, vj_value },
166 { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local,
167 "Accept peer's address for us", 1 },
168 { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote,
169 "Accept peer's address for it", 1 },
171 { "ipparam", o_string, &ipparam,
172 "Set ip script parameter", OPT_PRIO },
174 { "noipdefault", o_bool, &disable_defaultip,
175 "Don't use name for default IP adrs", 1 },
177 { "ms-dns", 1, (void *)setdnsaddr,
178 "DNS address for the peer's use" },
179 { "ms-wins", 1, (void *)setwinsaddr,
180 "Nameserver for SMB over TCP/IP for peer" },
182 { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
183 "Set timeout for IPCP", OPT_PRIO },
184 { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
185 "Set max #xmits for term-reqs", OPT_PRIO },
186 { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
187 "Set max #xmits for conf-reqs", OPT_PRIO },
188 { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
189 "Set max #conf-naks for IPCP", OPT_PRIO },
191 { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route,
192 "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route },
193 { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route,
194 "disable defaultroute option", OPT_A2CLR,
195 &ipcp_wantoptions[0].default_route },
196 { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
197 "disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
198 &ipcp_wantoptions[0].default_route },
200 { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
201 "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
202 { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
203 "disable proxyarp option", OPT_A2CLR,
204 &ipcp_wantoptions[0].proxy_arp },
205 { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
206 "disable proxyarp option", OPT_ALIAS | OPT_A2CLR,
207 &ipcp_wantoptions[0].proxy_arp },
209 { "usepeerdns", o_bool, &usepeerdns,
210 "Ask peer for DNS address(es)", 1 },
212 { "netmask", o_special, (void *)setnetmask,
213 "set netmask", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, netmask_str },
215 { "ipcp-no-addresses", o_bool, &ipcp_wantoptions[0].old_addrs,
216 "Disable old-style IP-Addresses usage", OPT_A2CLR,
217 &ipcp_allowoptions[0].old_addrs },
218 { "ipcp-no-address", o_bool, &ipcp_wantoptions[0].neg_addr,
219 "Disable IP-Address usage", OPT_A2CLR,
220 &ipcp_allowoptions[0].neg_addr },
222 { "IP addresses", o_wild, (void *) &setipaddr,
223 "set local and remote IP addresses",
224 OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr },
230 * Protocol entry points from main code.
232 static void ipcp_init __P((int));
233 static void ipcp_open __P((int));
234 static void ipcp_close __P((int, char *));
235 static void ipcp_lowerup __P((int));
236 static void ipcp_lowerdown __P((int));
237 static void ipcp_input __P((int, u_char *, int));
238 static void ipcp_protrej __P((int));
239 static int ipcp_printpkt __P((u_char *, int,
240 void (*) __P((void *, char *, ...)), void *));
241 static void ip_check_options __P((void));
242 static int ip_demand_conf __P((int));
243 static int ip_active_pkt __P((u_char *, int));
244 static void create_resolv __P((u_int32_t, u_int32_t));
246 struct protent ipcp_protent = {
266 static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t));
267 static void ipcp_script __P((char *)); /* Run an up/down script */
268 static void ipcp_script_done __P((void *));
271 * Lengths of configuration options.
274 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
275 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
276 #define CILEN_ADDR 6 /* new-style single address option */
277 #define CILEN_ADDRS 10 /* old-style dual address option */
280 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
281 (x) == CONFNAK ? "NAK" : "REJ")
284 * This state variable is used to ensure that we don't
285 * run an ipcp-up/down script while one is already running.
287 static enum script_state {
291 static pid_t ipcp_script_pid;
294 * Make a string representation of a network IP address.
302 slprintf(b, sizeof(b), "%I", ipaddr);
311 * setvjslots - set maximum number of connection slots for VJ compression
319 if (!int_option(*argv, &value))
321 if (value < 2 || value > 16) {
322 option_error("vj-max-slots value must be between 2 and 16");
325 ipcp_wantoptions [0].maxslotindex =
326 ipcp_allowoptions[0].maxslotindex = value - 1;
327 slprintf(vj_value, sizeof(vj_value), "%d", value);
332 * setdnsaddr - set the dns address(es)
341 dns = inet_addr(*argv);
342 if (dns == (u_int32_t) -1) {
343 if ((hp = gethostbyname(*argv)) == NULL) {
344 option_error("invalid address parameter '%s' for ms-dns option",
348 dns = *(u_int32_t *)hp->h_addr;
351 /* We take the last 2 values given, the 2nd-last as the primary
352 and the last as the secondary. If only one is given it
353 becomes both primary and secondary. */
354 if (ipcp_allowoptions[0].dnsaddr[1] == 0)
355 ipcp_allowoptions[0].dnsaddr[0] = dns;
357 ipcp_allowoptions[0].dnsaddr[0] = ipcp_allowoptions[0].dnsaddr[1];
359 /* always set the secondary address value. */
360 ipcp_allowoptions[0].dnsaddr[1] = dns;
366 * setwinsaddr - set the wins address(es)
367 * This is primrarly used with the Samba package under UNIX or for pointing
368 * the caller to the existing WINS server on a Windows NT platform.
377 wins = inet_addr(*argv);
378 if (wins == (u_int32_t) -1) {
379 if ((hp = gethostbyname(*argv)) == NULL) {
380 option_error("invalid address parameter '%s' for ms-wins option",
384 wins = *(u_int32_t *)hp->h_addr;
387 /* We take the last 2 values given, the 2nd-last as the primary
388 and the last as the secondary. If only one is given it
389 becomes both primary and secondary. */
390 if (ipcp_allowoptions[0].winsaddr[1] == 0)
391 ipcp_allowoptions[0].winsaddr[0] = wins;
393 ipcp_allowoptions[0].winsaddr[0] = ipcp_allowoptions[0].winsaddr[1];
395 /* always set the secondary address value. */
396 ipcp_allowoptions[0].winsaddr[1] = wins;
402 * setipaddr - Set the IP address
403 * If doit is 0, the call is to check whether this option is
404 * potentially an IP address specification.
405 * Not static so that plugins can call it to set the addresses
408 setipaddr(arg, argv, doit)
415 u_int32_t local, remote;
416 ipcp_options *wo = &ipcp_wantoptions[0];
417 static int prio_local = 0, prio_remote = 0;
420 * IP address pair separated by ":".
422 if ((colon = strchr(arg, ':')) == NULL)
428 * If colon first character, then no local addr.
430 if (colon != arg && option_priority >= prio_local) {
432 if ((local = inet_addr(arg)) == (u_int32_t) -1) {
433 if ((hp = gethostbyname(arg)) == NULL) {
434 option_error("unknown host: %s", arg);
437 local = *(u_int32_t *)hp->h_addr;
439 if (bad_ip_adrs(local)) {
440 option_error("bad local IP address %s", ip_ntoa(local));
446 prio_local = option_priority;
450 * If colon last character, then no remote addr.
452 if (*++colon != '\0' && option_priority >= prio_remote) {
453 if ((remote = inet_addr(colon)) == (u_int32_t) -1) {
454 if ((hp = gethostbyname(colon)) == NULL) {
455 option_error("unknown host: %s", colon);
458 remote = *(u_int32_t *)hp->h_addr;
459 if (remote_name[0] == 0)
460 strlcpy(remote_name, colon, sizeof(remote_name));
462 if (bad_ip_adrs(remote)) {
463 option_error("bad remote IP address %s", ip_ntoa(remote));
467 wo->hisaddr = remote;
468 prio_remote = option_priority;
475 printipaddr(opt, printer, arg)
477 void (*printer) __P((void *, char *, ...));
480 ipcp_options *wo = &ipcp_wantoptions[0];
482 if (wo->ouraddr != 0)
483 printer(arg, "%I", wo->ouraddr);
485 if (wo->hisaddr != 0)
486 printer(arg, "%I", wo->hisaddr);
490 * setnetmask - set the netmask to be used on the interface.
501 * Unfortunately, if we use inet_addr, we can't tell whether
502 * a result of all 1s is an error or a valid 255.255.255.255.
505 n = parse_dotted_ip(p, &mask);
509 if (n == 0 || p[n] != 0 || (netmask & ~mask) != 0) {
510 option_error("invalid netmask value '%s'", *argv);
515 slprintf(netmask_str, sizeof(netmask_str), "%I", mask);
521 parse_dotted_ip(p, vp)
531 b = strtoul(p, &endp, 0);
537 /* accept e.g. 0xffffff00 */
555 * ipcp_init - Initialize IPCP.
561 fsm *f = &ipcp_fsm[unit];
562 ipcp_options *wo = &ipcp_wantoptions[unit];
563 ipcp_options *ao = &ipcp_allowoptions[unit];
566 f->protocol = PPP_IPCP;
567 f->callbacks = &ipcp_callbacks;
568 fsm_init(&ipcp_fsm[unit]);
570 memset(wo, 0, sizeof(*wo));
571 memset(ao, 0, sizeof(*ao));
573 wo->neg_addr = wo->old_addrs = 1;
575 wo->vj_protocol = IPCP_VJ_COMP;
576 wo->maxslotindex = MAX_STATES - 1; /* really max index */
580 /* max slots and slot-id compression are currently hardwired in */
581 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
584 ao->neg_addr = ao->old_addrs = 1;
586 ao->maxslotindex = MAX_STATES - 1;
590 * XXX These control whether the user may use the proxyarp
591 * and defaultroute options.
594 ao->default_route = 1;
599 * ipcp_open - IPCP is allowed to come up.
605 fsm_open(&ipcp_fsm[unit]);
611 * ipcp_close - Take IPCP down.
614 ipcp_close(unit, reason)
618 fsm_close(&ipcp_fsm[unit], reason);
623 * ipcp_lowerup - The lower layer is up.
629 fsm_lowerup(&ipcp_fsm[unit]);
634 * ipcp_lowerdown - The lower layer is down.
640 fsm_lowerdown(&ipcp_fsm[unit]);
645 * ipcp_input - Input IPCP packet.
648 ipcp_input(unit, p, len)
653 fsm_input(&ipcp_fsm[unit], p, len);
658 * ipcp_protrej - A Protocol-Reject was received for IPCP.
660 * Pretend the lower layer went down, so we shut up.
666 fsm_lowerdown(&ipcp_fsm[unit]);
671 * ipcp_resetci - Reset our CI.
672 * Called by fsm_sconfreq, Send Configure Request.
678 ipcp_options *wo = &ipcp_wantoptions[f->unit];
679 ipcp_options *go = &ipcp_gotoptions[f->unit];
680 ipcp_options *ao = &ipcp_allowoptions[f->unit];
682 wo->req_addr = (wo->neg_addr || wo->old_addrs) &&
683 (ao->neg_addr || ao->old_addrs);
684 if (wo->ouraddr == 0)
685 wo->accept_local = 1;
686 if (wo->hisaddr == 0)
687 wo->accept_remote = 1;
688 wo->req_dns1 = usepeerdns; /* Request DNS addresses from the peer */
689 wo->req_dns2 = usepeerdns;
693 if (ip_choose_hook) {
694 ip_choose_hook(&wo->hisaddr);
696 wo->accept_remote = 0;
699 BZERO(&ipcp_hisoptions[f->unit], sizeof(ipcp_options));
704 * ipcp_cilen - Return length of our CI.
705 * Called by fsm_sconfreq, Send Configure Request.
711 ipcp_options *go = &ipcp_gotoptions[f->unit];
712 ipcp_options *wo = &ipcp_wantoptions[f->unit];
713 ipcp_options *ho = &ipcp_hisoptions[f->unit];
715 #define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0)
716 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
717 #define LENCIADDR(neg) (neg ? CILEN_ADDR : 0)
718 #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
721 * First see if we want to change our options to the old
722 * forms because we have received old forms from the peer.
724 if (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs)
726 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
727 /* try an older style of VJ negotiation */
728 /* use the old style only if the peer did */
729 if (ho->neg_vj && ho->old_vj) {
732 go->vj_protocol = ho->vj_protocol;
736 return (LENCIADDRS(!go->neg_addr && go->old_addrs) +
737 LENCIVJ(go->neg_vj, go->old_vj) +
738 LENCIADDR(go->neg_addr) +
739 LENCIDNS(go->req_dns1) +
740 LENCIDNS(go->req_dns2)) ;
745 * ipcp_addci - Add our desired CIs to a packet.
746 * Called by fsm_sconfreq, Send Configure Request.
749 ipcp_addci(f, ucp, lenp)
754 ipcp_options *go = &ipcp_gotoptions[f->unit];
757 #define ADDCIADDRS(opt, neg, val1, val2) \
759 if (len >= CILEN_ADDRS) { \
762 PUTCHAR(CILEN_ADDRS, ucp); \
767 len -= CILEN_ADDRS; \
772 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
774 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
775 if (len >= vjlen) { \
777 PUTCHAR(vjlen, ucp); \
778 PUTSHORT(val, ucp); \
780 PUTCHAR(maxslotindex, ucp); \
781 PUTCHAR(cflag, ucp); \
788 #define ADDCIADDR(opt, neg, val) \
790 if (len >= CILEN_ADDR) { \
793 PUTCHAR(CILEN_ADDR, ucp); \
801 #define ADDCIDNS(opt, neg, addr) \
803 if (len >= CILEN_ADDR) { \
806 PUTCHAR(CILEN_ADDR, ucp); \
814 ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
817 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
818 go->maxslotindex, go->cflag);
820 ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
822 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
824 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
831 * ipcp_ackci - Ack our CIs.
832 * Called by fsm_rconfack, Receive Configure ACK.
839 ipcp_ackci(f, p, len)
844 ipcp_options *go = &ipcp_gotoptions[f->unit];
845 u_short cilen, citype, cishort;
847 u_char cimaxslotindex, cicflag;
850 * CIs must be in exactly the same order that we sent...
851 * Check packet length and CI length at each step.
852 * If we find any deviations, then this packet is bad.
855 #define ACKCIADDRS(opt, neg, val1, val2) \
858 if ((len -= CILEN_ADDRS) < 0) \
860 GETCHAR(citype, p); \
862 if (cilen != CILEN_ADDRS || \
867 if (val1 != cilong) \
871 if (val2 != cilong) \
875 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
877 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
878 if ((len -= vjlen) < 0) \
880 GETCHAR(citype, p); \
882 if (cilen != vjlen || \
885 GETSHORT(cishort, p); \
886 if (cishort != val) \
889 GETCHAR(cimaxslotindex, p); \
890 if (cimaxslotindex != maxslotindex) \
892 GETCHAR(cicflag, p); \
893 if (cicflag != cflag) \
898 #define ACKCIADDR(opt, neg, val) \
901 if ((len -= CILEN_ADDR) < 0) \
903 GETCHAR(citype, p); \
905 if (cilen != CILEN_ADDR || \
914 #define ACKCIDNS(opt, neg, addr) \
917 if ((len -= CILEN_ADDR) < 0) \
919 GETCHAR(citype, p); \
921 if (cilen != CILEN_ADDR || citype != opt) \
925 if (addr != cilong) \
929 ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
932 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
933 go->maxslotindex, go->cflag);
935 ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
937 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
939 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
942 * If there are any remaining CIs, then this packet is bad.
949 IPCPDEBUG(("ipcp_ackci: received bad Ack!"));
954 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
955 * This should not modify any state if the Nak is bad
956 * or if IPCP is in the OPENED state.
957 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
964 ipcp_nakci(f, p, len, treat_as_reject)
970 ipcp_options *go = &ipcp_gotoptions[f->unit];
971 u_char cimaxslotindex, cicflag;
972 u_char citype, cilen, *next;
974 u_int32_t ciaddr1, ciaddr2, l, cidnsaddr;
975 ipcp_options no; /* options we've seen Naks for */
976 ipcp_options try; /* options to request next time */
978 BZERO(&no, sizeof(no));
982 * Any Nak'd CIs must be in exactly the same order that we sent.
983 * Check packet length and CI length at each step.
984 * If we find any deviations, then this packet is bad.
986 #define NAKCIADDRS(opt, neg, code) \
988 (cilen = p[1]) == CILEN_ADDRS && \
994 ciaddr1 = htonl(l); \
996 ciaddr2 = htonl(l); \
1001 #define NAKCIVJ(opt, neg, code) \
1003 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
1008 GETSHORT(cishort, p); \
1013 #define NAKCIADDR(opt, neg, code) \
1015 (cilen = p[1]) == CILEN_ADDR && \
1021 ciaddr1 = htonl(l); \
1026 #define NAKCIDNS(opt, neg, code) \
1028 ((cilen = p[1]) == CILEN_ADDR) && \
1034 cidnsaddr = htonl(l); \
1040 * Accept the peer's idea of {our,his} address, if different
1041 * from our idea, only if the accept_{local,remote} flag is set.
1043 NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1044 if (treat_as_reject) {
1047 if (go->accept_local && ciaddr1) {
1048 /* take his idea of our address */
1049 try.ouraddr = ciaddr1;
1051 if (go->accept_remote && ciaddr2) {
1052 /* take his idea of his address */
1053 try.hisaddr = ciaddr2;
1059 * Accept the peer's value of maxslotindex provided that it
1060 * is less than what we asked for. Turn off slot-ID compression
1061 * if the peer wants. Send old-style compress-type option if
1064 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
1065 if (treat_as_reject) {
1067 } else if (cilen == CILEN_VJ) {
1068 GETCHAR(cimaxslotindex, p);
1069 GETCHAR(cicflag, p);
1070 if (cishort == IPCP_VJ_COMP) {
1072 if (cimaxslotindex < go->maxslotindex)
1073 try.maxslotindex = cimaxslotindex;
1080 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
1082 try.vj_protocol = cishort;
1089 NAKCIADDR(CI_ADDR, neg_addr,
1090 if (treat_as_reject) {
1092 } else if (go->accept_local && ciaddr1) {
1093 /* take his idea of our address */
1094 try.ouraddr = ciaddr1;
1098 NAKCIDNS(CI_MS_DNS1, req_dns1,
1099 if (treat_as_reject) {
1102 try.dnsaddr[0] = cidnsaddr;
1106 NAKCIDNS(CI_MS_DNS2, req_dns2,
1107 if (treat_as_reject) {
1110 try.dnsaddr[1] = cidnsaddr;
1115 * There may be remaining CIs, if the peer is requesting negotiation
1116 * on an option that we didn't include in our request packet.
1117 * If they want to negotiate about IP addresses, we comply.
1118 * If they want us to ask for compression, we refuse.
1120 while (len >= CILEN_VOID) {
1123 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
1125 next = p + cilen - 2;
1128 case CI_COMPRESSTYPE:
1129 if (go->neg_vj || no.neg_vj ||
1130 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
1135 if ((!go->neg_addr && go->old_addrs) || no.old_addrs
1136 || cilen != CILEN_ADDRS)
1141 if (ciaddr1 && go->accept_local)
1142 try.ouraddr = ciaddr1;
1145 if (ciaddr2 && go->accept_remote)
1146 try.hisaddr = ciaddr2;
1150 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
1155 if (ciaddr1 && go->accept_local)
1156 try.ouraddr = ciaddr1;
1157 if (try.ouraddr != 0)
1166 * OK, the Nak is good. Now we can update state.
1167 * If there are any remaining options, we ignore them.
1169 if (f->state != OPENED)
1175 IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
1181 * ipcp_rejci - Reject some of our CIs.
1182 * Callback from fsm_rconfnakrej.
1185 ipcp_rejci(f, p, len)
1190 ipcp_options *go = &ipcp_gotoptions[f->unit];
1191 u_char cimaxslotindex, ciflag, cilen;
1194 ipcp_options try; /* options to request next time */
1198 * Any Rejected CIs must be in exactly the same order that we sent.
1199 * Check packet length and CI length at each step.
1200 * If we find any deviations, then this packet is bad.
1202 #define REJCIADDRS(opt, neg, val1, val2) \
1204 (cilen = p[1]) == CILEN_ADDRS && \
1211 cilong = htonl(l); \
1212 /* Check rejected value. */ \
1213 if (cilong != val1) \
1216 cilong = htonl(l); \
1217 /* Check rejected value. */ \
1218 if (cilong != val2) \
1220 try.old_addrs = 0; \
1223 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
1225 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
1230 GETSHORT(cishort, p); \
1231 /* Check rejected value. */ \
1232 if (cishort != val) \
1235 GETCHAR(cimaxslotindex, p); \
1236 if (cimaxslotindex != maxslot) \
1238 GETCHAR(ciflag, p); \
1239 if (ciflag != cflag) \
1245 #define REJCIADDR(opt, neg, val) \
1247 (cilen = p[1]) == CILEN_ADDR && \
1254 cilong = htonl(l); \
1255 /* Check rejected value. */ \
1256 if (cilong != val) \
1261 #define REJCIDNS(opt, neg, dnsaddr) \
1263 ((cilen = p[1]) == CILEN_ADDR) && \
1270 cilong = htonl(l); \
1271 /* Check rejected value. */ \
1272 if (cilong != dnsaddr) \
1278 REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1279 go->ouraddr, go->hisaddr);
1281 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
1282 go->maxslotindex, go->cflag);
1284 REJCIADDR(CI_ADDR, neg_addr, go->ouraddr);
1286 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
1288 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
1291 * If there are any remaining CIs, then this packet is bad.
1296 * Now we can update state.
1298 if (f->state != OPENED)
1303 IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
1309 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
1310 * Callback from fsm_rconfreq, Receive Configure Request
1312 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1313 * appropriately. If reject_if_disagree is non-zero, doesn't return
1314 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1317 ipcp_reqci(f, inp, len, reject_if_disagree)
1319 u_char *inp; /* Requested CIs */
1320 int *len; /* Length of requested CIs */
1321 int reject_if_disagree;
1323 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1324 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1325 ipcp_options *ao = &ipcp_allowoptions[f->unit];
1326 u_char *cip, *next; /* Pointer to current and next CIs */
1327 u_short cilen, citype; /* Parsed len, type */
1328 u_short cishort; /* Parsed short value */
1329 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
1330 int rc = CONFACK; /* Final packet return code */
1331 int orc; /* Individual option return code */
1332 u_char *p; /* Pointer to next char to parse */
1333 u_char *ucp = inp; /* Pointer to current output char */
1334 int l = *len; /* Length left */
1335 u_char maxslotindex, cflag;
1339 * Reset all his options.
1341 BZERO(ho, sizeof(*ho));
1344 * Process all his options.
1348 orc = CONFACK; /* Assume success */
1349 cip = p = next; /* Remember begining of CI */
1350 if (l < 2 || /* Not enough data for CI header or */
1351 p[1] < 2 || /* CI length too small or */
1352 p[1] > l) { /* CI length too big? */
1353 IPCPDEBUG(("ipcp_reqci: bad CI length!"));
1354 orc = CONFREJ; /* Reject bad CI */
1355 cilen = l; /* Reject till end of packet */
1356 l = 0; /* Don't loop again */
1359 GETCHAR(citype, p); /* Parse CI type */
1360 GETCHAR(cilen, p); /* Parse CI length */
1361 l -= cilen; /* Adjust remaining length */
1362 next += cilen; /* Step to next CI */
1364 switch (citype) { /* Check CI type */
1366 if (!ao->old_addrs || ho->neg_addr ||
1367 cilen != CILEN_ADDRS) { /* Check CI length */
1368 orc = CONFREJ; /* Reject CI */
1373 * If he has no address, or if we both have his address but
1374 * disagree about it, then NAK it with our idea.
1375 * In particular, if we don't know his address, but he does,
1378 GETLONG(tl, p); /* Parse source address (his) */
1379 ciaddr1 = htonl(tl);
1380 if (ciaddr1 != wo->hisaddr
1381 && (ciaddr1 == 0 || !wo->accept_remote)) {
1383 if (!reject_if_disagree) {
1384 DECPTR(sizeof(u_int32_t), p);
1385 tl = ntohl(wo->hisaddr);
1388 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1390 * If neither we nor he knows his address, reject the option.
1393 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1398 * If he doesn't know our address, or if we both have our address
1399 * but disagree about it, then NAK it with our idea.
1401 GETLONG(tl, p); /* Parse desination address (ours) */
1402 ciaddr2 = htonl(tl);
1403 if (ciaddr2 != wo->ouraddr) {
1404 if (ciaddr2 == 0 || !wo->accept_local) {
1406 if (!reject_if_disagree) {
1407 DECPTR(sizeof(u_int32_t), p);
1408 tl = ntohl(wo->ouraddr);
1412 wo->ouraddr = ciaddr2; /* accept peer's idea */
1417 ho->hisaddr = ciaddr1;
1418 ho->ouraddr = ciaddr2;
1422 if (!ao->neg_addr || ho->old_addrs ||
1423 cilen != CILEN_ADDR) { /* Check CI length */
1424 orc = CONFREJ; /* Reject CI */
1429 * If he has no address, or if we both have his address but
1430 * disagree about it, then NAK it with our idea.
1431 * In particular, if we don't know his address, but he does,
1434 GETLONG(tl, p); /* Parse source address (his) */
1435 ciaddr1 = htonl(tl);
1436 if (ciaddr1 != wo->hisaddr
1437 && (ciaddr1 == 0 || !wo->accept_remote)) {
1439 if (!reject_if_disagree) {
1440 DECPTR(sizeof(u_int32_t), p);
1441 tl = ntohl(wo->hisaddr);
1444 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1446 * Don't ACK an address of 0.0.0.0 - reject it instead.
1449 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1454 ho->hisaddr = ciaddr1;
1459 /* Microsoft primary or secondary DNS request */
1460 d = citype == CI_MS_DNS2;
1462 /* If we do not have a DNS address then we cannot send it */
1463 if (ao->dnsaddr[d] == 0 ||
1464 cilen != CILEN_ADDR) { /* Check CI length */
1465 orc = CONFREJ; /* Reject CI */
1469 if (htonl(tl) != ao->dnsaddr[d]) {
1470 DECPTR(sizeof(u_int32_t), p);
1471 tl = ntohl(ao->dnsaddr[d]);
1479 /* Microsoft primary or secondary WINS request */
1480 d = citype == CI_MS_WINS2;
1482 /* If we do not have a DNS address then we cannot send it */
1483 if (ao->winsaddr[d] == 0 ||
1484 cilen != CILEN_ADDR) { /* Check CI length */
1485 orc = CONFREJ; /* Reject CI */
1489 if (htonl(tl) != ao->winsaddr[d]) {
1490 DECPTR(sizeof(u_int32_t), p);
1491 tl = ntohl(ao->winsaddr[d]);
1497 case CI_COMPRESSTYPE:
1499 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
1503 GETSHORT(cishort, p);
1505 if (!(cishort == IPCP_VJ_COMP ||
1506 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1512 ho->vj_protocol = cishort;
1513 if (cilen == CILEN_VJ) {
1514 GETCHAR(maxslotindex, p);
1515 if (maxslotindex > ao->maxslotindex) {
1517 if (!reject_if_disagree){
1519 PUTCHAR(ao->maxslotindex, p);
1523 if (cflag && !ao->cflag) {
1525 if (!reject_if_disagree){
1527 PUTCHAR(wo->cflag, p);
1530 ho->maxslotindex = maxslotindex;
1534 ho->maxslotindex = MAX_STATES - 1;
1544 if (orc == CONFACK && /* Good CI */
1545 rc != CONFACK) /* but prior CI wasnt? */
1546 continue; /* Don't send this one */
1548 if (orc == CONFNAK) { /* Nak this CI? */
1549 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1550 orc = CONFREJ; /* Get tough if so */
1552 if (rc == CONFREJ) /* Rejecting prior CI? */
1553 continue; /* Don't send this one */
1554 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1555 rc = CONFNAK; /* Not anymore... */
1556 ucp = inp; /* Backup */
1561 if (orc == CONFREJ && /* Reject this CI */
1562 rc != CONFREJ) { /* but no prior ones? */
1564 ucp = inp; /* Backup */
1567 /* Need to move CI? */
1569 BCOPY(cip, ucp, cilen); /* Move it */
1571 /* Update output pointer */
1576 * If we aren't rejecting this packet, and we want to negotiate
1577 * their address, and they didn't send their address, then we
1578 * send a NAK with a CI_ADDR option appended. We assume the
1579 * input buffer is long enough that we can append the extra
1582 if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs &&
1583 wo->req_addr && !reject_if_disagree) {
1584 if (rc == CONFACK) {
1586 ucp = inp; /* reset pointer */
1587 wo->req_addr = 0; /* don't ask again */
1589 PUTCHAR(CI_ADDR, ucp);
1590 PUTCHAR(CILEN_ADDR, ucp);
1591 tl = ntohl(wo->hisaddr);
1595 *len = ucp - inp; /* Compute output length */
1596 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
1597 return (rc); /* Return final code */
1602 * ip_check_options - check that any IP-related options are OK,
1603 * and assign appropriate defaults.
1610 ipcp_options *wo = &ipcp_wantoptions[0];
1613 * Default our local IP address based on our hostname.
1614 * If local IP address already given, don't bother.
1616 if (wo->ouraddr == 0 && !disable_defaultip) {
1618 * Look up our hostname (possibly with domain name appended)
1619 * and take the first IP address as our local IP address.
1620 * If there isn't an IP address for our hostname, too bad.
1622 wo->accept_local = 1; /* don't insist on this default value */
1623 if ((hp = gethostbyname(hostname)) != NULL) {
1624 local = *(u_int32_t *)hp->h_addr;
1625 if (local != 0 && !bad_ip_adrs(local))
1626 wo->ouraddr = local;
1629 ask_for_local = wo->ouraddr != 0 || !disable_defaultip;
1634 * ip_demand_conf - configure the interface as though
1635 * IPCP were up, for use with dial-on-demand.
1641 ipcp_options *wo = &ipcp_wantoptions[u];
1643 if (wo->hisaddr == 0) {
1644 /* make up an arbitrary address for the peer */
1645 wo->hisaddr = htonl(0x0a707070 + ifunit);
1646 wo->accept_remote = 1;
1648 if (wo->ouraddr == 0) {
1649 /* make up an arbitrary address for us */
1650 wo->ouraddr = htonl(0x0a404040 + ifunit);
1651 wo->accept_local = 1;
1652 ask_for_local = 0; /* don't tell the peer this address */
1654 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1658 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1660 if (wo->default_route)
1661 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1662 default_route_set[u] = 1;
1664 if (sifproxyarp(u, wo->hisaddr))
1665 proxy_arp_set[u] = 1;
1667 notice("local IP address %I", wo->ouraddr);
1668 notice("remote IP address %I", wo->hisaddr);
1675 * ipcp_up - IPCP has come UP.
1677 * Configure the IP network interface appropriately and bring it up.
1684 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1685 ipcp_options *go = &ipcp_gotoptions[f->unit];
1686 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1688 IPCPDEBUG(("ipcp: up"));
1691 * We must have a non-zero IP address for both ends of the link.
1693 if (!ho->neg_addr && !ho->old_addrs)
1694 ho->hisaddr = wo->hisaddr;
1696 if (go->ouraddr == 0) {
1697 error("Could not determine local IP address");
1698 ipcp_close(f->unit, "Could not determine local IP address");
1701 if (ho->hisaddr == 0) {
1702 ho->hisaddr = htonl(0x0a404040 + ifunit);
1703 warn("Could not determine remote IP address: defaulting to %I",
1706 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
1707 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
1710 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
1712 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
1713 if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1714 script_setenv("USEPEERDNS", "1", 0);
1715 create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
1719 * Check that the peer is allowed to use the IP address it wants.
1721 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1722 error("Peer is not authorized to use remote address %I", ho->hisaddr);
1723 ipcp_close(f->unit, "Unauthorized remote IP address");
1727 /* set tcp compression */
1728 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1731 * If we are doing dial-on-demand, the interface is already
1732 * configured, so we put out any saved-up packets, then set the
1733 * interface to pass IP packets.
1736 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1737 ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
1738 if (go->ouraddr != wo->ouraddr) {
1739 warn("Local IP address changed to %I", go->ouraddr);
1740 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
1741 wo->ouraddr = go->ouraddr;
1743 script_unsetenv("OLDIPLOCAL");
1744 if (ho->hisaddr != wo->hisaddr) {
1745 warn("Remote IP address changed to %I", ho->hisaddr);
1746 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0);
1747 wo->hisaddr = ho->hisaddr;
1749 script_unsetenv("OLDIPREMOTE");
1751 /* Set the interface to the new addresses */
1752 mask = GetMask(go->ouraddr);
1753 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1755 warn("Interface configuration failed");
1756 ipcp_close(f->unit, "Interface configuration failed");
1760 /* assign a default route through the interface if required */
1761 if (ipcp_wantoptions[f->unit].default_route)
1762 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1763 default_route_set[f->unit] = 1;
1765 /* Make a proxy ARP entry if requested. */
1766 if (ipcp_wantoptions[f->unit].proxy_arp)
1767 if (sifproxyarp(f->unit, ho->hisaddr))
1768 proxy_arp_set[f->unit] = 1;
1771 demand_rexmit(PPP_IP);
1772 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1776 * Set IP addresses and (if specified) netmask.
1778 mask = GetMask(go->ouraddr);
1780 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1781 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1783 warn("Interface configuration failed");
1784 ipcp_close(f->unit, "Interface configuration failed");
1789 /* bring the interface up for IP */
1790 if (!sifup(f->unit)) {
1792 warn("Interface failed to come up");
1793 ipcp_close(f->unit, "Interface configuration failed");
1797 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1798 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1800 warn("Interface configuration failed");
1801 ipcp_close(f->unit, "Interface configuration failed");
1805 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1807 /* assign a default route through the interface if required */
1808 if (ipcp_wantoptions[f->unit].default_route)
1809 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1810 default_route_set[f->unit] = 1;
1812 /* Make a proxy ARP entry if requested. */
1813 if (ipcp_wantoptions[f->unit].proxy_arp)
1814 if (sifproxyarp(f->unit, ho->hisaddr))
1815 proxy_arp_set[f->unit] = 1;
1817 ipcp_wantoptions[0].ouraddr = go->ouraddr;
1819 notice("local IP address %I", go->ouraddr);
1820 notice("remote IP address %I", ho->hisaddr);
1822 notice("primary DNS address %I", go->dnsaddr[0]);
1824 notice("secondary DNS address %I", go->dnsaddr[1]);
1827 reset_link_stats(f->unit);
1829 np_up(f->unit, PPP_IP);
1832 notify(ip_up_notifier, 0);
1837 * Execute the ip-up script, like this:
1838 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1840 if (ipcp_script_state == s_down && ipcp_script_pid == 0) {
1841 ipcp_script_state = s_up;
1842 ipcp_script(_PATH_IPUP);
1848 * ipcp_down - IPCP has gone DOWN.
1850 * Take the IP network interface down, clear its addresses
1851 * and delete routes through it.
1857 IPCPDEBUG(("ipcp: down"));
1858 /* XXX a bit IPv4-centric here, we only need to get the stats
1859 * before the interface is marked down. */
1860 /* XXX more correct: we must get the stats before running the notifiers,
1861 * at least for the radius plugin */
1862 update_link_stats(f->unit);
1863 notify(ip_down_notifier, 0);
1868 np_down(f->unit, PPP_IP);
1870 sifvjcomp(f->unit, 0, 0, 0);
1872 print_link_stats(); /* _after_ running the notifiers and ip_down_hook(),
1873 * because print_link_stats() sets link_stats_valid
1877 * If we are doing dial-on-demand, set the interface
1878 * to queue up outgoing packets (for now).
1881 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1883 sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
1885 ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
1886 ipcp_hisoptions[f->unit].hisaddr);
1889 /* Execute the ip-down script */
1890 if (ipcp_script_state == s_up && ipcp_script_pid == 0) {
1891 ipcp_script_state = s_down;
1892 ipcp_script(_PATH_IPDOWN);
1898 * ipcp_clear_addrs() - clear the interface addresses, routes,
1899 * proxy arp entries, etc.
1902 ipcp_clear_addrs(unit, ouraddr, hisaddr)
1904 u_int32_t ouraddr; /* local address */
1905 u_int32_t hisaddr; /* remote address */
1907 if (proxy_arp_set[unit]) {
1908 cifproxyarp(unit, hisaddr);
1909 proxy_arp_set[unit] = 0;
1911 if (default_route_set[unit]) {
1912 cifdefaultroute(unit, ouraddr, hisaddr);
1913 default_route_set[unit] = 0;
1915 cifaddr(unit, ouraddr, hisaddr);
1920 * ipcp_finished - possibly shut down the lower layers.
1928 np_finished(f->unit, PPP_IP);
1934 * ipcp_script_done - called when the ip-up or ip-down script
1938 ipcp_script_done(arg)
1941 ipcp_script_pid = 0;
1942 switch (ipcp_script_state) {
1944 if (ipcp_fsm[0].state != OPENED) {
1945 ipcp_script_state = s_down;
1946 ipcp_script(_PATH_IPDOWN);
1950 if (ipcp_fsm[0].state == OPENED) {
1951 ipcp_script_state = s_up;
1952 ipcp_script(_PATH_IPUP);
1960 * ipcp_script - Execute a script with arguments
1961 * interface-name tty-name speed local-IP remote-IP.
1967 char strspeed[32], strlocal[32], strremote[32];
1970 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
1971 slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr);
1972 slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr);
1979 argv[5] = strremote;
1982 ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, NULL);
1986 * create_resolv - create the replacement resolv.conf file
1989 create_resolv(peerdns1, peerdns2)
1990 u_int32_t peerdns1, peerdns2;
1994 f = fopen(_PATH_RESOLV, "w");
1996 error("Failed to create %s: %m", _PATH_RESOLV);
2001 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1));
2004 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2));
2007 error("Write failed to %s: %m", _PATH_RESOLV);
2013 * ipcp_printpkt - print the contents of an IPCP packet.
2015 static char *ipcp_codenames[] = {
2016 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
2017 "TermReq", "TermAck", "CodeRej"
2021 ipcp_printpkt(p, plen, printer, arg)
2024 void (*printer) __P((void *, char *, ...));
2027 int code, id, len, olen;
2028 u_char *pstart, *optend;
2032 if (plen < HEADERLEN)
2038 if (len < HEADERLEN || len > plen)
2041 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
2042 printer(arg, " %s", ipcp_codenames[code-1]);
2044 printer(arg, " code=0x%x", code);
2045 printer(arg, " id=0x%x", id);
2052 /* print option list */
2057 if (olen < 2 || olen > len) {
2065 if (olen == CILEN_ADDRS) {
2068 printer(arg, "addrs %I", htonl(cilong));
2070 printer(arg, " %I", htonl(cilong));
2073 case CI_COMPRESSTYPE:
2074 if (olen >= CILEN_COMPRESS) {
2076 GETSHORT(cishort, p);
2077 printer(arg, "compress ");
2082 case IPCP_VJ_COMP_OLD:
2083 printer(arg, "old-VJ");
2086 printer(arg, "0x%x", cishort);
2091 if (olen == CILEN_ADDR) {
2094 printer(arg, "addr %I", htonl(cilong));
2101 printer(arg, "ms-dns%d %I", code - CI_MS_DNS1 + 1,
2108 printer(arg, "ms-wins %I", htonl(cilong));
2111 while (p < optend) {
2113 printer(arg, " %.2x", code);
2121 if (len > 0 && *p >= ' ' && *p < 0x7f) {
2123 print_string((char *)p, len, printer, arg);
2130 /* print the rest of the bytes in the packet */
2131 for (; len > 0; --len) {
2133 printer(arg, " %.2x", code);
2140 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
2141 * We don't bring the link up for IP fragments or for TCP FIN packets
2144 #define IP_HDRLEN 20 /* bytes */
2145 #define IP_OFFMASK 0x1fff
2147 #define IPPROTO_TCP 6
2149 #define TCP_HDRLEN 20
2153 * We use these macros because the IP header may be at an odd address,
2154 * and some compilers might use word loads to get th_off or ip_hl.
2157 #define net_short(x) (((x)[0] << 8) + (x)[1])
2158 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
2159 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
2160 #define get_ipproto(x) (((unsigned char *)(x))[9])
2161 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
2162 #define get_tcpflags(x) (((unsigned char *)(x))[13])
2165 ip_active_pkt(pkt, len)
2174 if (len < IP_HDRLEN)
2176 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
2178 if (get_ipproto(pkt) != IPPROTO_TCP)
2180 hlen = get_iphl(pkt) * 4;
2181 if (len < hlen + TCP_HDRLEN)
2184 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)