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", 1, (void *)setdnsaddr,
179 "DNS address for the peer's use" },
180 { "ms-wins", 1, (void *)setwinsaddr,
181 "Nameserver for SMB over TCP/IP for peer" },
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]);
578 memset(wo, 0, sizeof(*wo));
579 memset(ao, 0, sizeof(*ao));
581 wo->neg_addr = wo->old_addrs = 1;
583 wo->vj_protocol = IPCP_VJ_COMP;
584 wo->maxslotindex = MAX_STATES - 1; /* really max index */
588 /* max slots and slot-id compression are currently hardwired in */
589 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
592 ao->neg_addr = ao->old_addrs = 1;
594 ao->maxslotindex = MAX_STATES - 1;
598 * XXX These control whether the user may use the proxyarp
599 * and defaultroute options.
602 ao->default_route = 1;
607 * ipcp_open - IPCP is allowed to come up.
613 fsm_open(&ipcp_fsm[unit]);
619 * ipcp_close - Take IPCP down.
622 ipcp_close(unit, reason)
626 fsm_close(&ipcp_fsm[unit], reason);
631 * ipcp_lowerup - The lower layer is up.
637 fsm_lowerup(&ipcp_fsm[unit]);
642 * ipcp_lowerdown - The lower layer is down.
648 fsm_lowerdown(&ipcp_fsm[unit]);
653 * ipcp_input - Input IPCP packet.
656 ipcp_input(unit, p, len)
661 fsm_input(&ipcp_fsm[unit], p, len);
666 * ipcp_protrej - A Protocol-Reject was received for IPCP.
668 * Pretend the lower layer went down, so we shut up.
674 fsm_lowerdown(&ipcp_fsm[unit]);
679 * ipcp_resetci - Reset our CI.
680 * Called by fsm_sconfreq, Send Configure Request.
686 ipcp_options *wo = &ipcp_wantoptions[f->unit];
687 ipcp_options *go = &ipcp_gotoptions[f->unit];
688 ipcp_options *ao = &ipcp_allowoptions[f->unit];
690 wo->req_addr = (wo->neg_addr || wo->old_addrs) &&
691 (ao->neg_addr || ao->old_addrs);
692 if (wo->ouraddr == 0)
693 wo->accept_local = 1;
694 if (wo->hisaddr == 0)
695 wo->accept_remote = 1;
696 wo->req_dns1 = usepeerdns; /* Request DNS addresses from the peer */
697 wo->req_dns2 = usepeerdns;
701 if (ip_choose_hook) {
702 ip_choose_hook(&wo->hisaddr);
704 wo->accept_remote = 0;
707 BZERO(&ipcp_hisoptions[f->unit], sizeof(ipcp_options));
712 * ipcp_cilen - Return length of our CI.
713 * Called by fsm_sconfreq, Send Configure Request.
719 ipcp_options *go = &ipcp_gotoptions[f->unit];
720 ipcp_options *wo = &ipcp_wantoptions[f->unit];
721 ipcp_options *ho = &ipcp_hisoptions[f->unit];
723 #define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0)
724 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
725 #define LENCIADDR(neg) (neg ? CILEN_ADDR : 0)
726 #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
729 * First see if we want to change our options to the old
730 * forms because we have received old forms from the peer.
732 if (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs)
734 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
735 /* try an older style of VJ negotiation */
736 /* use the old style only if the peer did */
737 if (ho->neg_vj && ho->old_vj) {
740 go->vj_protocol = ho->vj_protocol;
744 return (LENCIADDRS(!go->neg_addr && go->old_addrs) +
745 LENCIVJ(go->neg_vj, go->old_vj) +
746 LENCIADDR(go->neg_addr) +
747 LENCIDNS(go->req_dns1) +
748 LENCIDNS(go->req_dns2)) ;
753 * ipcp_addci - Add our desired CIs to a packet.
754 * Called by fsm_sconfreq, Send Configure Request.
757 ipcp_addci(f, ucp, lenp)
762 ipcp_options *go = &ipcp_gotoptions[f->unit];
765 #define ADDCIADDRS(opt, neg, val1, val2) \
767 if (len >= CILEN_ADDRS) { \
770 PUTCHAR(CILEN_ADDRS, ucp); \
775 len -= CILEN_ADDRS; \
780 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
782 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
783 if (len >= vjlen) { \
785 PUTCHAR(vjlen, ucp); \
786 PUTSHORT(val, ucp); \
788 PUTCHAR(maxslotindex, ucp); \
789 PUTCHAR(cflag, ucp); \
796 #define ADDCIADDR(opt, neg, val) \
798 if (len >= CILEN_ADDR) { \
801 PUTCHAR(CILEN_ADDR, ucp); \
809 #define ADDCIDNS(opt, neg, addr) \
811 if (len >= CILEN_ADDR) { \
814 PUTCHAR(CILEN_ADDR, ucp); \
822 ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
825 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
826 go->maxslotindex, go->cflag);
828 ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
830 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
832 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
839 * ipcp_ackci - Ack our CIs.
840 * Called by fsm_rconfack, Receive Configure ACK.
847 ipcp_ackci(f, p, len)
852 ipcp_options *go = &ipcp_gotoptions[f->unit];
853 u_short cilen, citype, cishort;
855 u_char cimaxslotindex, cicflag;
858 * CIs must be in exactly the same order that we sent...
859 * Check packet length and CI length at each step.
860 * If we find any deviations, then this packet is bad.
863 #define ACKCIADDRS(opt, neg, val1, val2) \
866 if ((len -= CILEN_ADDRS) < 0) \
868 GETCHAR(citype, p); \
870 if (cilen != CILEN_ADDRS || \
875 if (val1 != cilong) \
879 if (val2 != cilong) \
883 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
885 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
886 if ((len -= vjlen) < 0) \
888 GETCHAR(citype, p); \
890 if (cilen != vjlen || \
893 GETSHORT(cishort, p); \
894 if (cishort != val) \
897 GETCHAR(cimaxslotindex, p); \
898 if (cimaxslotindex != maxslotindex) \
900 GETCHAR(cicflag, p); \
901 if (cicflag != cflag) \
906 #define ACKCIADDR(opt, neg, val) \
909 if ((len -= CILEN_ADDR) < 0) \
911 GETCHAR(citype, p); \
913 if (cilen != CILEN_ADDR || \
922 #define ACKCIDNS(opt, neg, addr) \
925 if ((len -= CILEN_ADDR) < 0) \
927 GETCHAR(citype, p); \
929 if (cilen != CILEN_ADDR || citype != opt) \
933 if (addr != cilong) \
937 ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
940 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
941 go->maxslotindex, go->cflag);
943 ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
945 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
947 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
950 * If there are any remaining CIs, then this packet is bad.
957 IPCPDEBUG(("ipcp_ackci: received bad Ack!"));
962 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
963 * This should not modify any state if the Nak is bad
964 * or if IPCP is in the OPENED state.
965 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
972 ipcp_nakci(f, p, len, treat_as_reject)
978 ipcp_options *go = &ipcp_gotoptions[f->unit];
979 u_char cimaxslotindex, cicflag;
980 u_char citype, cilen, *next;
982 u_int32_t ciaddr1, ciaddr2, l, cidnsaddr;
983 ipcp_options no; /* options we've seen Naks for */
984 ipcp_options try; /* options to request next time */
986 BZERO(&no, sizeof(no));
990 * Any Nak'd CIs must be in exactly the same order that we sent.
991 * Check packet length and CI length at each step.
992 * If we find any deviations, then this packet is bad.
994 #define NAKCIADDRS(opt, neg, code) \
996 (cilen = p[1]) == CILEN_ADDRS && \
1002 ciaddr1 = htonl(l); \
1004 ciaddr2 = htonl(l); \
1009 #define NAKCIVJ(opt, neg, code) \
1011 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
1016 GETSHORT(cishort, p); \
1021 #define NAKCIADDR(opt, neg, code) \
1023 (cilen = p[1]) == CILEN_ADDR && \
1029 ciaddr1 = htonl(l); \
1034 #define NAKCIDNS(opt, neg, code) \
1036 ((cilen = p[1]) == CILEN_ADDR) && \
1042 cidnsaddr = htonl(l); \
1048 * Accept the peer's idea of {our,his} address, if different
1049 * from our idea, only if the accept_{local,remote} flag is set.
1051 NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1052 if (treat_as_reject) {
1055 if (go->accept_local && ciaddr1) {
1056 /* take his idea of our address */
1057 try.ouraddr = ciaddr1;
1059 if (go->accept_remote && ciaddr2) {
1060 /* take his idea of his address */
1061 try.hisaddr = ciaddr2;
1067 * Accept the peer's value of maxslotindex provided that it
1068 * is less than what we asked for. Turn off slot-ID compression
1069 * if the peer wants. Send old-style compress-type option if
1072 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
1073 if (treat_as_reject) {
1075 } else if (cilen == CILEN_VJ) {
1076 GETCHAR(cimaxslotindex, p);
1077 GETCHAR(cicflag, p);
1078 if (cishort == IPCP_VJ_COMP) {
1080 if (cimaxslotindex < go->maxslotindex)
1081 try.maxslotindex = cimaxslotindex;
1088 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
1090 try.vj_protocol = cishort;
1097 NAKCIADDR(CI_ADDR, neg_addr,
1098 if (treat_as_reject) {
1101 } else if (go->accept_local && ciaddr1) {
1102 /* take his idea of our address */
1103 try.ouraddr = ciaddr1;
1107 NAKCIDNS(CI_MS_DNS1, req_dns1,
1108 if (treat_as_reject) {
1111 try.dnsaddr[0] = cidnsaddr;
1115 NAKCIDNS(CI_MS_DNS2, req_dns2,
1116 if (treat_as_reject) {
1119 try.dnsaddr[1] = cidnsaddr;
1124 * There may be remaining CIs, if the peer is requesting negotiation
1125 * on an option that we didn't include in our request packet.
1126 * If they want to negotiate about IP addresses, we comply.
1127 * If they want us to ask for compression, we refuse.
1128 * If they want us to ask for ms-dns, we do that, since some
1129 * peers get huffy if we don't.
1131 while (len >= CILEN_VOID) {
1134 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
1136 next = p + cilen - 2;
1139 case CI_COMPRESSTYPE:
1140 if (go->neg_vj || no.neg_vj ||
1141 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
1146 if ((!go->neg_addr && go->old_addrs) || no.old_addrs
1147 || cilen != CILEN_ADDRS)
1152 if (ciaddr1 && go->accept_local)
1153 try.ouraddr = ciaddr1;
1156 if (ciaddr2 && go->accept_remote)
1157 try.hisaddr = ciaddr2;
1161 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
1166 if (ciaddr1 && go->accept_local)
1167 try.ouraddr = ciaddr1;
1168 if (try.ouraddr != 0)
1173 if (go->req_dns1 || no.req_dns1 || cilen != CILEN_ADDR)
1176 try.dnsaddr[0] = htonl(l);
1181 if (go->req_dns2 || no.req_dns2 || cilen != CILEN_ADDR)
1184 try.dnsaddr[1] = htonl(l);
1193 * OK, the Nak is good. Now we can update state.
1194 * If there are any remaining options, we ignore them.
1196 if (f->state != OPENED)
1202 IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
1208 * ipcp_rejci - Reject some of our CIs.
1209 * Callback from fsm_rconfnakrej.
1212 ipcp_rejci(f, p, len)
1217 ipcp_options *go = &ipcp_gotoptions[f->unit];
1218 u_char cimaxslotindex, ciflag, cilen;
1221 ipcp_options try; /* options to request next time */
1225 * Any Rejected CIs must be in exactly the same order that we sent.
1226 * Check packet length and CI length at each step.
1227 * If we find any deviations, then this packet is bad.
1229 #define REJCIADDRS(opt, neg, val1, val2) \
1231 (cilen = p[1]) == CILEN_ADDRS && \
1238 cilong = htonl(l); \
1239 /* Check rejected value. */ \
1240 if (cilong != val1) \
1243 cilong = htonl(l); \
1244 /* Check rejected value. */ \
1245 if (cilong != val2) \
1247 try.old_addrs = 0; \
1250 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
1252 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
1257 GETSHORT(cishort, p); \
1258 /* Check rejected value. */ \
1259 if (cishort != val) \
1262 GETCHAR(cimaxslotindex, p); \
1263 if (cimaxslotindex != maxslot) \
1265 GETCHAR(ciflag, p); \
1266 if (ciflag != cflag) \
1272 #define REJCIADDR(opt, neg, val) \
1274 (cilen = p[1]) == CILEN_ADDR && \
1281 cilong = htonl(l); \
1282 /* Check rejected value. */ \
1283 if (cilong != val) \
1288 #define REJCIDNS(opt, neg, dnsaddr) \
1290 ((cilen = p[1]) == CILEN_ADDR) && \
1297 cilong = htonl(l); \
1298 /* Check rejected value. */ \
1299 if (cilong != dnsaddr) \
1305 REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1306 go->ouraddr, go->hisaddr);
1308 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
1309 go->maxslotindex, go->cflag);
1311 REJCIADDR(CI_ADDR, neg_addr, go->ouraddr);
1313 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
1315 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
1318 * If there are any remaining CIs, then this packet is bad.
1323 * Now we can update state.
1325 if (f->state != OPENED)
1330 IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
1336 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
1337 * Callback from fsm_rconfreq, Receive Configure Request
1339 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1340 * appropriately. If reject_if_disagree is non-zero, doesn't return
1341 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1344 ipcp_reqci(f, inp, len, reject_if_disagree)
1346 u_char *inp; /* Requested CIs */
1347 int *len; /* Length of requested CIs */
1348 int reject_if_disagree;
1350 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1351 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1352 ipcp_options *ao = &ipcp_allowoptions[f->unit];
1353 u_char *cip, *next; /* Pointer to current and next CIs */
1354 u_short cilen, citype; /* Parsed len, type */
1355 u_short cishort; /* Parsed short value */
1356 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
1357 int rc = CONFACK; /* Final packet return code */
1358 int orc; /* Individual option return code */
1359 u_char *p; /* Pointer to next char to parse */
1360 u_char *ucp = inp; /* Pointer to current output char */
1361 int l = *len; /* Length left */
1362 u_char maxslotindex, cflag;
1366 * Reset all his options.
1368 BZERO(ho, sizeof(*ho));
1371 * Process all his options.
1375 orc = CONFACK; /* Assume success */
1376 cip = p = next; /* Remember begining of CI */
1377 if (l < 2 || /* Not enough data for CI header or */
1378 p[1] < 2 || /* CI length too small or */
1379 p[1] > l) { /* CI length too big? */
1380 IPCPDEBUG(("ipcp_reqci: bad CI length!"));
1381 orc = CONFREJ; /* Reject bad CI */
1382 cilen = l; /* Reject till end of packet */
1383 l = 0; /* Don't loop again */
1386 GETCHAR(citype, p); /* Parse CI type */
1387 GETCHAR(cilen, p); /* Parse CI length */
1388 l -= cilen; /* Adjust remaining length */
1389 next += cilen; /* Step to next CI */
1391 switch (citype) { /* Check CI type */
1393 if (!ao->old_addrs || ho->neg_addr ||
1394 cilen != CILEN_ADDRS) { /* Check CI length */
1395 orc = CONFREJ; /* Reject CI */
1400 * If he has no address, or if we both have his address but
1401 * disagree about it, then NAK it with our idea.
1402 * In particular, if we don't know his address, but he does,
1405 GETLONG(tl, p); /* Parse source address (his) */
1406 ciaddr1 = htonl(tl);
1407 if (ciaddr1 != wo->hisaddr
1408 && (ciaddr1 == 0 || !wo->accept_remote)) {
1410 if (!reject_if_disagree) {
1411 DECPTR(sizeof(u_int32_t), p);
1412 tl = ntohl(wo->hisaddr);
1415 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1417 * If neither we nor he knows his address, reject the option.
1420 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1425 * If he doesn't know our address, or if we both have our address
1426 * but disagree about it, then NAK it with our idea.
1428 GETLONG(tl, p); /* Parse desination address (ours) */
1429 ciaddr2 = htonl(tl);
1430 if (ciaddr2 != wo->ouraddr) {
1431 if (ciaddr2 == 0 || !wo->accept_local) {
1433 if (!reject_if_disagree) {
1434 DECPTR(sizeof(u_int32_t), p);
1435 tl = ntohl(wo->ouraddr);
1439 wo->ouraddr = ciaddr2; /* accept peer's idea */
1444 ho->hisaddr = ciaddr1;
1445 ho->ouraddr = ciaddr2;
1449 if (!ao->neg_addr || ho->old_addrs ||
1450 cilen != CILEN_ADDR) { /* Check CI length */
1451 orc = CONFREJ; /* Reject CI */
1456 * If he has no address, or if we both have his address but
1457 * disagree about it, then NAK it with our idea.
1458 * In particular, if we don't know his address, but he does,
1461 GETLONG(tl, p); /* Parse source address (his) */
1462 ciaddr1 = htonl(tl);
1463 if (ciaddr1 != wo->hisaddr
1464 && (ciaddr1 == 0 || !wo->accept_remote)) {
1466 if (!reject_if_disagree) {
1467 DECPTR(sizeof(u_int32_t), p);
1468 tl = ntohl(wo->hisaddr);
1471 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1473 * Don't ACK an address of 0.0.0.0 - reject it instead.
1476 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1481 ho->hisaddr = ciaddr1;
1486 /* Microsoft primary or secondary DNS request */
1487 d = citype == CI_MS_DNS2;
1489 /* If we do not have a DNS address then we cannot send it */
1490 if (ao->dnsaddr[d] == 0 ||
1491 cilen != CILEN_ADDR) { /* Check CI length */
1492 orc = CONFREJ; /* Reject CI */
1496 if (htonl(tl) != ao->dnsaddr[d]) {
1497 DECPTR(sizeof(u_int32_t), p);
1498 tl = ntohl(ao->dnsaddr[d]);
1506 /* Microsoft primary or secondary WINS request */
1507 d = citype == CI_MS_WINS2;
1509 /* If we do not have a DNS address then we cannot send it */
1510 if (ao->winsaddr[d] == 0 ||
1511 cilen != CILEN_ADDR) { /* Check CI length */
1512 orc = CONFREJ; /* Reject CI */
1516 if (htonl(tl) != ao->winsaddr[d]) {
1517 DECPTR(sizeof(u_int32_t), p);
1518 tl = ntohl(ao->winsaddr[d]);
1524 case CI_COMPRESSTYPE:
1526 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
1530 GETSHORT(cishort, p);
1532 if (!(cishort == IPCP_VJ_COMP ||
1533 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1539 ho->vj_protocol = cishort;
1540 if (cilen == CILEN_VJ) {
1541 GETCHAR(maxslotindex, p);
1542 if (maxslotindex > ao->maxslotindex) {
1544 if (!reject_if_disagree){
1546 PUTCHAR(ao->maxslotindex, p);
1550 if (cflag && !ao->cflag) {
1552 if (!reject_if_disagree){
1554 PUTCHAR(wo->cflag, p);
1557 ho->maxslotindex = maxslotindex;
1561 ho->maxslotindex = MAX_STATES - 1;
1571 if (orc == CONFACK && /* Good CI */
1572 rc != CONFACK) /* but prior CI wasnt? */
1573 continue; /* Don't send this one */
1575 if (orc == CONFNAK) { /* Nak this CI? */
1576 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1577 orc = CONFREJ; /* Get tough if so */
1579 if (rc == CONFREJ) /* Rejecting prior CI? */
1580 continue; /* Don't send this one */
1581 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1582 rc = CONFNAK; /* Not anymore... */
1583 ucp = inp; /* Backup */
1588 if (orc == CONFREJ && /* Reject this CI */
1589 rc != CONFREJ) { /* but no prior ones? */
1591 ucp = inp; /* Backup */
1594 /* Need to move CI? */
1596 BCOPY(cip, ucp, cilen); /* Move it */
1598 /* Update output pointer */
1603 * If we aren't rejecting this packet, and we want to negotiate
1604 * their address, and they didn't send their address, then we
1605 * send a NAK with a CI_ADDR option appended. We assume the
1606 * input buffer is long enough that we can append the extra
1609 if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs &&
1610 wo->req_addr && !reject_if_disagree && !noremoteip) {
1611 if (rc == CONFACK) {
1613 ucp = inp; /* reset pointer */
1614 wo->req_addr = 0; /* don't ask again */
1616 PUTCHAR(CI_ADDR, ucp);
1617 PUTCHAR(CILEN_ADDR, ucp);
1618 tl = ntohl(wo->hisaddr);
1622 *len = ucp - inp; /* Compute output length */
1623 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
1624 return (rc); /* Return final code */
1629 * ip_check_options - check that any IP-related options are OK,
1630 * and assign appropriate defaults.
1637 ipcp_options *wo = &ipcp_wantoptions[0];
1640 * Default our local IP address based on our hostname.
1641 * If local IP address already given, don't bother.
1643 if (wo->ouraddr == 0 && !disable_defaultip) {
1645 * Look up our hostname (possibly with domain name appended)
1646 * and take the first IP address as our local IP address.
1647 * If there isn't an IP address for our hostname, too bad.
1649 wo->accept_local = 1; /* don't insist on this default value */
1650 if ((hp = gethostbyname(hostname)) != NULL) {
1651 local = *(u_int32_t *)hp->h_addr;
1652 if (local != 0 && !bad_ip_adrs(local))
1653 wo->ouraddr = local;
1656 ask_for_local = wo->ouraddr != 0 || !disable_defaultip;
1661 * ip_demand_conf - configure the interface as though
1662 * IPCP were up, for use with dial-on-demand.
1668 ipcp_options *wo = &ipcp_wantoptions[u];
1670 if (wo->hisaddr == 0 && !noremoteip) {
1671 /* make up an arbitrary address for the peer */
1672 wo->hisaddr = htonl(0x0a707070 + ifunit);
1673 wo->accept_remote = 1;
1675 if (wo->ouraddr == 0) {
1676 /* make up an arbitrary address for us */
1677 wo->ouraddr = htonl(0x0a404040 + ifunit);
1678 wo->accept_local = 1;
1679 ask_for_local = 0; /* don't tell the peer this address */
1681 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1683 ipcp_script(_PATH_IPPREUP, 1);
1686 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1688 if (wo->default_route)
1689 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1690 default_route_set[u] = 1;
1692 if (sifproxyarp(u, wo->hisaddr))
1693 proxy_arp_set[u] = 1;
1695 notice("local IP address %I", wo->ouraddr);
1697 notice("remote IP address %I", wo->hisaddr);
1704 * ipcp_up - IPCP has come UP.
1706 * Configure the IP network interface appropriately and bring it up.
1713 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1714 ipcp_options *go = &ipcp_gotoptions[f->unit];
1715 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1717 IPCPDEBUG(("ipcp: up"));
1720 * We must have a non-zero IP address for both ends of the link.
1722 if (!ho->neg_addr && !ho->old_addrs)
1723 ho->hisaddr = wo->hisaddr;
1725 if (!(go->neg_addr || go->old_addrs) && (wo->neg_addr || wo->old_addrs)
1726 && wo->ouraddr != 0) {
1727 error("Peer refused to agree to our IP address");
1728 ipcp_close(f->unit, "Refused our IP address");
1731 if (go->ouraddr == 0) {
1732 error("Could not determine local IP address");
1733 ipcp_close(f->unit, "Could not determine local IP address");
1736 if (ho->hisaddr == 0 && !noremoteip) {
1737 ho->hisaddr = htonl(0x0a404040 + ifunit);
1738 warn("Could not determine remote IP address: defaulting to %I",
1741 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
1742 if (ho->hisaddr != 0)
1743 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
1750 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
1752 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
1753 if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1754 script_setenv("USEPEERDNS", "1", 0);
1755 create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
1759 * Check that the peer is allowed to use the IP address it wants.
1761 if (ho->hisaddr != 0 && !auth_ip_addr(f->unit, ho->hisaddr)) {
1762 error("Peer is not authorized to use remote address %I", ho->hisaddr);
1763 ipcp_close(f->unit, "Unauthorized remote IP address");
1767 /* set tcp compression */
1768 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1771 * If we are doing dial-on-demand, the interface is already
1772 * configured, so we put out any saved-up packets, then set the
1773 * interface to pass IP packets.
1776 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1777 ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
1778 if (go->ouraddr != wo->ouraddr) {
1779 warn("Local IP address changed to %I", go->ouraddr);
1780 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
1781 wo->ouraddr = go->ouraddr;
1783 script_unsetenv("OLDIPLOCAL");
1784 if (ho->hisaddr != wo->hisaddr && wo->hisaddr != 0) {
1785 warn("Remote IP address changed to %I", ho->hisaddr);
1786 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0);
1787 wo->hisaddr = ho->hisaddr;
1789 script_unsetenv("OLDIPREMOTE");
1791 /* Set the interface to the new addresses */
1792 mask = GetMask(go->ouraddr);
1793 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1795 warn("Interface configuration failed");
1796 ipcp_close(f->unit, "Interface configuration failed");
1800 /* assign a default route through the interface if required */
1801 if (ipcp_wantoptions[f->unit].default_route)
1802 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1803 default_route_set[f->unit] = 1;
1805 /* Make a proxy ARP entry if requested. */
1806 if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
1807 if (sifproxyarp(f->unit, ho->hisaddr))
1808 proxy_arp_set[f->unit] = 1;
1811 demand_rexmit(PPP_IP);
1812 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1816 * Set IP addresses and (if specified) netmask.
1818 mask = GetMask(go->ouraddr);
1820 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1821 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1823 warn("Interface configuration failed");
1824 ipcp_close(f->unit, "Interface configuration failed");
1829 /* run the pre-up script, if any, and wait for it to finish */
1830 ipcp_script(_PATH_IPPREUP, 1);
1832 /* bring the interface up for IP */
1833 if (!sifup(f->unit)) {
1835 warn("Interface failed to come up");
1836 ipcp_close(f->unit, "Interface configuration failed");
1840 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1841 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1843 warn("Interface configuration failed");
1844 ipcp_close(f->unit, "Interface configuration failed");
1848 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1850 /* assign a default route through the interface if required */
1851 if (ipcp_wantoptions[f->unit].default_route)
1852 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1853 default_route_set[f->unit] = 1;
1855 /* Make a proxy ARP entry if requested. */
1856 if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
1857 if (sifproxyarp(f->unit, ho->hisaddr))
1858 proxy_arp_set[f->unit] = 1;
1860 ipcp_wantoptions[0].ouraddr = go->ouraddr;
1862 notice("local IP address %I", go->ouraddr);
1863 if (ho->hisaddr != 0)
1864 notice("remote IP address %I", ho->hisaddr);
1866 notice("primary DNS address %I", go->dnsaddr[0]);
1868 notice("secondary DNS address %I", go->dnsaddr[1]);
1871 reset_link_stats(f->unit);
1873 np_up(f->unit, PPP_IP);
1876 notify(ip_up_notifier, 0);
1881 * Execute the ip-up script, like this:
1882 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1884 if (ipcp_script_state == s_down && ipcp_script_pid == 0) {
1885 ipcp_script_state = s_up;
1886 ipcp_script(_PATH_IPUP, 0);
1892 * ipcp_down - IPCP has gone DOWN.
1894 * Take the IP network interface down, clear its addresses
1895 * and delete routes through it.
1901 IPCPDEBUG(("ipcp: down"));
1902 /* XXX a bit IPv4-centric here, we only need to get the stats
1903 * before the interface is marked down. */
1904 /* XXX more correct: we must get the stats before running the notifiers,
1905 * at least for the radius plugin */
1906 update_link_stats(f->unit);
1907 notify(ip_down_notifier, 0);
1912 np_down(f->unit, PPP_IP);
1914 sifvjcomp(f->unit, 0, 0, 0);
1916 print_link_stats(); /* _after_ running the notifiers and ip_down_hook(),
1917 * because print_link_stats() sets link_stats_valid
1921 * If we are doing dial-on-demand, set the interface
1922 * to queue up outgoing packets (for now).
1925 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1927 sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
1929 ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
1930 ipcp_hisoptions[f->unit].hisaddr);
1933 /* Execute the ip-down script */
1934 if (ipcp_script_state == s_up && ipcp_script_pid == 0) {
1935 ipcp_script_state = s_down;
1936 ipcp_script(_PATH_IPDOWN, 0);
1942 * ipcp_clear_addrs() - clear the interface addresses, routes,
1943 * proxy arp entries, etc.
1946 ipcp_clear_addrs(unit, ouraddr, hisaddr)
1948 u_int32_t ouraddr; /* local address */
1949 u_int32_t hisaddr; /* remote address */
1951 if (proxy_arp_set[unit]) {
1952 cifproxyarp(unit, hisaddr);
1953 proxy_arp_set[unit] = 0;
1955 if (default_route_set[unit]) {
1956 cifdefaultroute(unit, ouraddr, hisaddr);
1957 default_route_set[unit] = 0;
1959 cifaddr(unit, ouraddr, hisaddr);
1964 * ipcp_finished - possibly shut down the lower layers.
1972 np_finished(f->unit, PPP_IP);
1978 * ipcp_script_done - called when the ip-up or ip-down script
1982 ipcp_script_done(arg)
1985 ipcp_script_pid = 0;
1986 switch (ipcp_script_state) {
1988 if (ipcp_fsm[0].state != OPENED) {
1989 ipcp_script_state = s_down;
1990 ipcp_script(_PATH_IPDOWN, 0);
1994 if (ipcp_fsm[0].state == OPENED) {
1995 ipcp_script_state = s_up;
1996 ipcp_script(_PATH_IPUP, 0);
2004 * ipcp_script - Execute a script with arguments
2005 * interface-name tty-name speed local-IP remote-IP.
2008 ipcp_script(script, wait)
2012 char strspeed[32], strlocal[32], strremote[32];
2015 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2016 slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr);
2017 slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr);
2024 argv[5] = strremote;
2028 run_program(script, argv, 0, NULL, NULL, 1);
2030 ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done,
2035 * create_resolv - create the replacement resolv.conf file
2038 create_resolv(peerdns1, peerdns2)
2039 u_int32_t peerdns1, peerdns2;
2043 f = fopen(_PATH_RESOLV, "w");
2045 error("Failed to create %s: %m", _PATH_RESOLV);
2050 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1));
2053 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2));
2056 error("Write failed to %s: %m", _PATH_RESOLV);
2062 * ipcp_printpkt - print the contents of an IPCP packet.
2064 static char *ipcp_codenames[] = {
2065 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
2066 "TermReq", "TermAck", "CodeRej"
2070 ipcp_printpkt(p, plen, printer, arg)
2073 void (*printer) __P((void *, char *, ...));
2076 int code, id, len, olen;
2077 u_char *pstart, *optend;
2081 if (plen < HEADERLEN)
2087 if (len < HEADERLEN || len > plen)
2090 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
2091 printer(arg, " %s", ipcp_codenames[code-1]);
2093 printer(arg, " code=0x%x", code);
2094 printer(arg, " id=0x%x", id);
2101 /* print option list */
2106 if (olen < 2 || olen > len) {
2114 if (olen == CILEN_ADDRS) {
2117 printer(arg, "addrs %I", htonl(cilong));
2119 printer(arg, " %I", htonl(cilong));
2122 case CI_COMPRESSTYPE:
2123 if (olen >= CILEN_COMPRESS) {
2125 GETSHORT(cishort, p);
2126 printer(arg, "compress ");
2131 case IPCP_VJ_COMP_OLD:
2132 printer(arg, "old-VJ");
2135 printer(arg, "0x%x", cishort);
2140 if (olen == CILEN_ADDR) {
2143 printer(arg, "addr %I", htonl(cilong));
2150 printer(arg, "ms-dns%d %I", (code == CI_MS_DNS1? 1: 2),
2157 printer(arg, "ms-wins %I", htonl(cilong));
2160 while (p < optend) {
2162 printer(arg, " %.2x", code);
2170 if (len > 0 && *p >= ' ' && *p < 0x7f) {
2172 print_string((char *)p, len, printer, arg);
2179 /* print the rest of the bytes in the packet */
2180 for (; len > 0; --len) {
2182 printer(arg, " %.2x", code);
2189 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
2190 * We don't bring the link up for IP fragments or for TCP FIN packets
2193 #define IP_HDRLEN 20 /* bytes */
2194 #define IP_OFFMASK 0x1fff
2196 #define IPPROTO_TCP 6
2198 #define TCP_HDRLEN 20
2202 * We use these macros because the IP header may be at an odd address,
2203 * and some compilers might use word loads to get th_off or ip_hl.
2206 #define net_short(x) (((x)[0] << 8) + (x)[1])
2207 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
2208 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
2209 #define get_ipproto(x) (((unsigned char *)(x))[9])
2210 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
2211 #define get_tcpflags(x) (((unsigned char *)(x))[13])
2214 ip_active_pkt(pkt, len)
2223 if (len < IP_HDRLEN)
2225 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
2227 if (get_ipproto(pkt) != IPPROTO_TCP)
2229 hlen = get_iphl(pkt) * 4;
2230 if (len < hlen + TCP_HDRLEN)
2233 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)