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 1.67 2004/11/08 11:45:59 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)); /* 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)
969 ipcp_options *go = &ipcp_gotoptions[f->unit];
970 u_char cimaxslotindex, cicflag;
971 u_char citype, cilen, *next;
973 u_int32_t ciaddr1, ciaddr2, l, cidnsaddr;
974 ipcp_options no; /* options we've seen Naks for */
975 ipcp_options try; /* options to request next time */
977 BZERO(&no, sizeof(no));
981 * Any Nak'd CIs must be in exactly the same order that we sent.
982 * Check packet length and CI length at each step.
983 * If we find any deviations, then this packet is bad.
985 #define NAKCIADDRS(opt, neg, code) \
987 (cilen = p[1]) == CILEN_ADDRS && \
993 ciaddr1 = htonl(l); \
995 ciaddr2 = htonl(l); \
1000 #define NAKCIVJ(opt, neg, code) \
1002 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
1007 GETSHORT(cishort, p); \
1012 #define NAKCIADDR(opt, neg, code) \
1014 (cilen = p[1]) == CILEN_ADDR && \
1020 ciaddr1 = htonl(l); \
1025 #define NAKCIDNS(opt, neg, code) \
1027 ((cilen = p[1]) == CILEN_ADDR) && \
1033 cidnsaddr = htonl(l); \
1039 * Accept the peer's idea of {our,his} address, if different
1040 * from our idea, only if the accept_{local,remote} flag is set.
1042 NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1043 if (go->accept_local && ciaddr1) { /* Do we know our address? */
1044 try.ouraddr = ciaddr1;
1046 if (go->accept_remote && ciaddr2) { /* Does he know his? */
1047 try.hisaddr = ciaddr2;
1052 * Accept the peer's value of maxslotindex provided that it
1053 * is less than what we asked for. Turn off slot-ID compression
1054 * if the peer wants. Send old-style compress-type option if
1057 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
1058 if (cilen == CILEN_VJ) {
1059 GETCHAR(cimaxslotindex, p);
1060 GETCHAR(cicflag, p);
1061 if (cishort == IPCP_VJ_COMP) {
1063 if (cimaxslotindex < go->maxslotindex)
1064 try.maxslotindex = cimaxslotindex;
1071 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
1073 try.vj_protocol = cishort;
1080 NAKCIADDR(CI_ADDR, neg_addr,
1081 if (go->accept_local && ciaddr1) { /* Do we know our address? */
1082 try.ouraddr = ciaddr1;
1086 NAKCIDNS(CI_MS_DNS1, req_dns1,
1087 try.dnsaddr[0] = cidnsaddr;
1090 NAKCIDNS(CI_MS_DNS2, req_dns2,
1091 try.dnsaddr[1] = cidnsaddr;
1095 * There may be remaining CIs, if the peer is requesting negotiation
1096 * on an option that we didn't include in our request packet.
1097 * If they want to negotiate about IP addresses, we comply.
1098 * If they want us to ask for compression, we refuse.
1100 while (len >= CILEN_VOID) {
1103 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
1105 next = p + cilen - 2;
1108 case CI_COMPRESSTYPE:
1109 if (go->neg_vj || no.neg_vj ||
1110 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
1115 if ((!go->neg_addr && go->old_addrs) || no.old_addrs
1116 || cilen != CILEN_ADDRS)
1121 if (ciaddr1 && go->accept_local)
1122 try.ouraddr = ciaddr1;
1125 if (ciaddr2 && go->accept_remote)
1126 try.hisaddr = ciaddr2;
1130 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
1135 if (ciaddr1 && go->accept_local)
1136 try.ouraddr = ciaddr1;
1137 if (try.ouraddr != 0)
1146 * OK, the Nak is good. Now we can update state.
1147 * If there are any remaining options, we ignore them.
1149 if (f->state != OPENED)
1155 IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
1161 * ipcp_rejci - Reject some of our CIs.
1162 * Callback from fsm_rconfnakrej.
1165 ipcp_rejci(f, p, len)
1170 ipcp_options *go = &ipcp_gotoptions[f->unit];
1171 u_char cimaxslotindex, ciflag, cilen;
1174 ipcp_options try; /* options to request next time */
1178 * Any Rejected CIs must be in exactly the same order that we sent.
1179 * Check packet length and CI length at each step.
1180 * If we find any deviations, then this packet is bad.
1182 #define REJCIADDRS(opt, neg, val1, val2) \
1184 (cilen = p[1]) == CILEN_ADDRS && \
1191 cilong = htonl(l); \
1192 /* Check rejected value. */ \
1193 if (cilong != val1) \
1196 cilong = htonl(l); \
1197 /* Check rejected value. */ \
1198 if (cilong != val2) \
1200 try.old_addrs = 0; \
1203 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
1205 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
1210 GETSHORT(cishort, p); \
1211 /* Check rejected value. */ \
1212 if (cishort != val) \
1215 GETCHAR(cimaxslotindex, p); \
1216 if (cimaxslotindex != maxslot) \
1218 GETCHAR(ciflag, p); \
1219 if (ciflag != cflag) \
1225 #define REJCIADDR(opt, neg, val) \
1227 (cilen = p[1]) == CILEN_ADDR && \
1234 cilong = htonl(l); \
1235 /* Check rejected value. */ \
1236 if (cilong != val) \
1241 #define REJCIDNS(opt, neg, dnsaddr) \
1243 ((cilen = p[1]) == CILEN_ADDR) && \
1250 cilong = htonl(l); \
1251 /* Check rejected value. */ \
1252 if (cilong != dnsaddr) \
1258 REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1259 go->ouraddr, go->hisaddr);
1261 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
1262 go->maxslotindex, go->cflag);
1264 REJCIADDR(CI_ADDR, neg_addr, go->ouraddr);
1266 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
1268 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
1271 * If there are any remaining CIs, then this packet is bad.
1276 * Now we can update state.
1278 if (f->state != OPENED)
1283 IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
1289 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
1290 * Callback from fsm_rconfreq, Receive Configure Request
1292 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1293 * appropriately. If reject_if_disagree is non-zero, doesn't return
1294 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1297 ipcp_reqci(f, inp, len, reject_if_disagree)
1299 u_char *inp; /* Requested CIs */
1300 int *len; /* Length of requested CIs */
1301 int reject_if_disagree;
1303 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1304 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1305 ipcp_options *ao = &ipcp_allowoptions[f->unit];
1306 u_char *cip, *next; /* Pointer to current and next CIs */
1307 u_short cilen, citype; /* Parsed len, type */
1308 u_short cishort; /* Parsed short value */
1309 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
1310 int rc = CONFACK; /* Final packet return code */
1311 int orc; /* Individual option return code */
1312 u_char *p; /* Pointer to next char to parse */
1313 u_char *ucp = inp; /* Pointer to current output char */
1314 int l = *len; /* Length left */
1315 u_char maxslotindex, cflag;
1319 * Reset all his options.
1321 BZERO(ho, sizeof(*ho));
1324 * Process all his options.
1328 orc = CONFACK; /* Assume success */
1329 cip = p = next; /* Remember begining of CI */
1330 if (l < 2 || /* Not enough data for CI header or */
1331 p[1] < 2 || /* CI length too small or */
1332 p[1] > l) { /* CI length too big? */
1333 IPCPDEBUG(("ipcp_reqci: bad CI length!"));
1334 orc = CONFREJ; /* Reject bad CI */
1335 cilen = l; /* Reject till end of packet */
1336 l = 0; /* Don't loop again */
1339 GETCHAR(citype, p); /* Parse CI type */
1340 GETCHAR(cilen, p); /* Parse CI length */
1341 l -= cilen; /* Adjust remaining length */
1342 next += cilen; /* Step to next CI */
1344 switch (citype) { /* Check CI type */
1346 if (!ao->old_addrs || ho->neg_addr ||
1347 cilen != CILEN_ADDRS) { /* Check CI length */
1348 orc = CONFREJ; /* Reject CI */
1353 * If he has no address, or if we both have his address but
1354 * disagree about it, then NAK it with our idea.
1355 * In particular, if we don't know his address, but he does,
1358 GETLONG(tl, p); /* Parse source address (his) */
1359 ciaddr1 = htonl(tl);
1360 if (ciaddr1 != wo->hisaddr
1361 && (ciaddr1 == 0 || !wo->accept_remote)) {
1363 if (!reject_if_disagree) {
1364 DECPTR(sizeof(u_int32_t), p);
1365 tl = ntohl(wo->hisaddr);
1368 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1370 * If neither we nor he knows his address, reject the option.
1373 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1378 * If he doesn't know our address, or if we both have our address
1379 * but disagree about it, then NAK it with our idea.
1381 GETLONG(tl, p); /* Parse desination address (ours) */
1382 ciaddr2 = htonl(tl);
1383 if (ciaddr2 != wo->ouraddr) {
1384 if (ciaddr2 == 0 || !wo->accept_local) {
1386 if (!reject_if_disagree) {
1387 DECPTR(sizeof(u_int32_t), p);
1388 tl = ntohl(wo->ouraddr);
1392 wo->ouraddr = ciaddr2; /* accept peer's idea */
1397 ho->hisaddr = ciaddr1;
1398 ho->ouraddr = ciaddr2;
1402 if (!ao->neg_addr || ho->old_addrs ||
1403 cilen != CILEN_ADDR) { /* Check CI length */
1404 orc = CONFREJ; /* Reject CI */
1409 * If he has no address, or if we both have his address but
1410 * disagree about it, then NAK it with our idea.
1411 * In particular, if we don't know his address, but he does,
1414 GETLONG(tl, p); /* Parse source address (his) */
1415 ciaddr1 = htonl(tl);
1416 if (ciaddr1 != wo->hisaddr
1417 && (ciaddr1 == 0 || !wo->accept_remote)) {
1419 if (!reject_if_disagree) {
1420 DECPTR(sizeof(u_int32_t), p);
1421 tl = ntohl(wo->hisaddr);
1424 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1426 * Don't ACK an address of 0.0.0.0 - reject it instead.
1429 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1434 ho->hisaddr = ciaddr1;
1439 /* Microsoft primary or secondary DNS request */
1440 d = citype == CI_MS_DNS2;
1442 /* If we do not have a DNS address then we cannot send it */
1443 if (ao->dnsaddr[d] == 0 ||
1444 cilen != CILEN_ADDR) { /* Check CI length */
1445 orc = CONFREJ; /* Reject CI */
1449 if (htonl(tl) != ao->dnsaddr[d]) {
1450 DECPTR(sizeof(u_int32_t), p);
1451 tl = ntohl(ao->dnsaddr[d]);
1459 /* Microsoft primary or secondary WINS request */
1460 d = citype == CI_MS_WINS2;
1462 /* If we do not have a DNS address then we cannot send it */
1463 if (ao->winsaddr[d] == 0 ||
1464 cilen != CILEN_ADDR) { /* Check CI length */
1465 orc = CONFREJ; /* Reject CI */
1469 if (htonl(tl) != ao->winsaddr[d]) {
1470 DECPTR(sizeof(u_int32_t), p);
1471 tl = ntohl(ao->winsaddr[d]);
1477 case CI_COMPRESSTYPE:
1479 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
1483 GETSHORT(cishort, p);
1485 if (!(cishort == IPCP_VJ_COMP ||
1486 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1492 ho->vj_protocol = cishort;
1493 if (cilen == CILEN_VJ) {
1494 GETCHAR(maxslotindex, p);
1495 if (maxslotindex > ao->maxslotindex) {
1497 if (!reject_if_disagree){
1499 PUTCHAR(ao->maxslotindex, p);
1503 if (cflag && !ao->cflag) {
1505 if (!reject_if_disagree){
1507 PUTCHAR(wo->cflag, p);
1510 ho->maxslotindex = maxslotindex;
1514 ho->maxslotindex = MAX_STATES - 1;
1524 if (orc == CONFACK && /* Good CI */
1525 rc != CONFACK) /* but prior CI wasnt? */
1526 continue; /* Don't send this one */
1528 if (orc == CONFNAK) { /* Nak this CI? */
1529 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1530 orc = CONFREJ; /* Get tough if so */
1532 if (rc == CONFREJ) /* Rejecting prior CI? */
1533 continue; /* Don't send this one */
1534 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1535 rc = CONFNAK; /* Not anymore... */
1536 ucp = inp; /* Backup */
1541 if (orc == CONFREJ && /* Reject this CI */
1542 rc != CONFREJ) { /* but no prior ones? */
1544 ucp = inp; /* Backup */
1547 /* Need to move CI? */
1549 BCOPY(cip, ucp, cilen); /* Move it */
1551 /* Update output pointer */
1556 * If we aren't rejecting this packet, and we want to negotiate
1557 * their address, and they didn't send their address, then we
1558 * send a NAK with a CI_ADDR option appended. We assume the
1559 * input buffer is long enough that we can append the extra
1562 if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs &&
1563 wo->req_addr && !reject_if_disagree) {
1564 if (rc == CONFACK) {
1566 ucp = inp; /* reset pointer */
1567 wo->req_addr = 0; /* don't ask again */
1569 PUTCHAR(CI_ADDR, ucp);
1570 PUTCHAR(CILEN_ADDR, ucp);
1571 tl = ntohl(wo->hisaddr);
1575 *len = ucp - inp; /* Compute output length */
1576 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
1577 return (rc); /* Return final code */
1582 * ip_check_options - check that any IP-related options are OK,
1583 * and assign appropriate defaults.
1590 ipcp_options *wo = &ipcp_wantoptions[0];
1593 * Default our local IP address based on our hostname.
1594 * If local IP address already given, don't bother.
1596 if (wo->ouraddr == 0 && !disable_defaultip) {
1598 * Look up our hostname (possibly with domain name appended)
1599 * and take the first IP address as our local IP address.
1600 * If there isn't an IP address for our hostname, too bad.
1602 wo->accept_local = 1; /* don't insist on this default value */
1603 if ((hp = gethostbyname(hostname)) != NULL) {
1604 local = *(u_int32_t *)hp->h_addr;
1605 if (local != 0 && !bad_ip_adrs(local))
1606 wo->ouraddr = local;
1609 ask_for_local = wo->ouraddr != 0 || !disable_defaultip;
1614 * ip_demand_conf - configure the interface as though
1615 * IPCP were up, for use with dial-on-demand.
1621 ipcp_options *wo = &ipcp_wantoptions[u];
1623 if (wo->hisaddr == 0) {
1624 /* make up an arbitrary address for the peer */
1625 wo->hisaddr = htonl(0x0a707070 + ifunit);
1626 wo->accept_remote = 1;
1628 if (wo->ouraddr == 0) {
1629 /* make up an arbitrary address for us */
1630 wo->ouraddr = htonl(0x0a404040 + ifunit);
1631 wo->accept_local = 1;
1632 ask_for_local = 0; /* don't tell the peer this address */
1634 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1638 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1640 if (wo->default_route)
1641 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1642 default_route_set[u] = 1;
1644 if (sifproxyarp(u, wo->hisaddr))
1645 proxy_arp_set[u] = 1;
1647 notice("local IP address %I", wo->ouraddr);
1648 notice("remote IP address %I", wo->hisaddr);
1655 * ipcp_up - IPCP has come UP.
1657 * Configure the IP network interface appropriately and bring it up.
1664 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1665 ipcp_options *go = &ipcp_gotoptions[f->unit];
1666 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1668 IPCPDEBUG(("ipcp: up"));
1671 * We must have a non-zero IP address for both ends of the link.
1673 if (!ho->neg_addr && !ho->old_addrs)
1674 ho->hisaddr = wo->hisaddr;
1676 if (go->ouraddr == 0) {
1677 error("Could not determine local IP address");
1678 ipcp_close(f->unit, "Could not determine local IP address");
1681 if (ho->hisaddr == 0) {
1682 ho->hisaddr = htonl(0x0a404040 + ifunit);
1683 warn("Could not determine remote IP address: defaulting to %I",
1686 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
1687 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
1690 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
1692 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
1693 if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1694 script_setenv("USEPEERDNS", "1", 0);
1695 create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
1699 * Check that the peer is allowed to use the IP address it wants.
1701 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1702 error("Peer is not authorized to use remote address %I", ho->hisaddr);
1703 ipcp_close(f->unit, "Unauthorized remote IP address");
1707 /* set tcp compression */
1708 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1711 * If we are doing dial-on-demand, the interface is already
1712 * configured, so we put out any saved-up packets, then set the
1713 * interface to pass IP packets.
1716 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1717 ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
1718 if (go->ouraddr != wo->ouraddr) {
1719 warn("Local IP address changed to %I", go->ouraddr);
1720 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
1721 wo->ouraddr = go->ouraddr;
1723 script_unsetenv("OLDIPLOCAL");
1724 if (ho->hisaddr != wo->hisaddr) {
1725 warn("Remote IP address changed to %I", ho->hisaddr);
1726 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0);
1727 wo->hisaddr = ho->hisaddr;
1729 script_unsetenv("OLDIPREMOTE");
1731 /* Set the interface to the new addresses */
1732 mask = GetMask(go->ouraddr);
1733 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1735 warn("Interface configuration failed");
1736 ipcp_close(f->unit, "Interface configuration failed");
1740 /* assign a default route through the interface if required */
1741 if (ipcp_wantoptions[f->unit].default_route)
1742 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1743 default_route_set[f->unit] = 1;
1745 /* Make a proxy ARP entry if requested. */
1746 if (ipcp_wantoptions[f->unit].proxy_arp)
1747 if (sifproxyarp(f->unit, ho->hisaddr))
1748 proxy_arp_set[f->unit] = 1;
1751 demand_rexmit(PPP_IP);
1752 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1756 * Set IP addresses and (if specified) netmask.
1758 mask = GetMask(go->ouraddr);
1760 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1761 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1763 warn("Interface configuration failed");
1764 ipcp_close(f->unit, "Interface configuration failed");
1769 /* bring the interface up for IP */
1770 if (!sifup(f->unit)) {
1772 warn("Interface failed to come up");
1773 ipcp_close(f->unit, "Interface configuration failed");
1777 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1778 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1780 warn("Interface configuration failed");
1781 ipcp_close(f->unit, "Interface configuration failed");
1785 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1787 /* assign a default route through the interface if required */
1788 if (ipcp_wantoptions[f->unit].default_route)
1789 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1790 default_route_set[f->unit] = 1;
1792 /* Make a proxy ARP entry if requested. */
1793 if (ipcp_wantoptions[f->unit].proxy_arp)
1794 if (sifproxyarp(f->unit, ho->hisaddr))
1795 proxy_arp_set[f->unit] = 1;
1797 ipcp_wantoptions[0].ouraddr = go->ouraddr;
1799 notice("local IP address %I", go->ouraddr);
1800 notice("remote IP address %I", ho->hisaddr);
1802 notice("primary DNS address %I", go->dnsaddr[0]);
1804 notice("secondary DNS address %I", go->dnsaddr[1]);
1807 reset_link_stats(f->unit);
1809 np_up(f->unit, PPP_IP);
1812 notify(ip_up_notifier, 0);
1817 * Execute the ip-up script, like this:
1818 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1820 if (ipcp_script_state == s_down && ipcp_script_pid == 0) {
1821 ipcp_script_state = s_up;
1822 ipcp_script(_PATH_IPUP);
1828 * ipcp_down - IPCP has gone DOWN.
1830 * Take the IP network interface down, clear its addresses
1831 * and delete routes through it.
1837 IPCPDEBUG(("ipcp: down"));
1838 /* XXX a bit IPv4-centric here, we only need to get the stats
1839 * before the interface is marked down. */
1840 /* XXX more correct: we must get the stats before running the notifiers,
1841 * at least for the radius plugin */
1842 update_link_stats(f->unit);
1843 notify(ip_down_notifier, 0);
1848 np_down(f->unit, PPP_IP);
1850 sifvjcomp(f->unit, 0, 0, 0);
1852 print_link_stats(); /* _after_ running the notifiers and ip_down_hook(),
1853 * because print_link_stats() sets link_stats_valid
1857 * If we are doing dial-on-demand, set the interface
1858 * to queue up outgoing packets (for now).
1861 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1863 sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
1865 ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
1866 ipcp_hisoptions[f->unit].hisaddr);
1869 /* Execute the ip-down script */
1870 if (ipcp_script_state == s_up && ipcp_script_pid == 0) {
1871 ipcp_script_state = s_down;
1872 ipcp_script(_PATH_IPDOWN);
1878 * ipcp_clear_addrs() - clear the interface addresses, routes,
1879 * proxy arp entries, etc.
1882 ipcp_clear_addrs(unit, ouraddr, hisaddr)
1884 u_int32_t ouraddr; /* local address */
1885 u_int32_t hisaddr; /* remote address */
1887 if (proxy_arp_set[unit]) {
1888 cifproxyarp(unit, hisaddr);
1889 proxy_arp_set[unit] = 0;
1891 if (default_route_set[unit]) {
1892 cifdefaultroute(unit, ouraddr, hisaddr);
1893 default_route_set[unit] = 0;
1895 cifaddr(unit, ouraddr, hisaddr);
1900 * ipcp_finished - possibly shut down the lower layers.
1908 np_finished(f->unit, PPP_IP);
1914 * ipcp_script_done - called when the ip-up or ip-down script
1918 ipcp_script_done(arg)
1921 ipcp_script_pid = 0;
1922 switch (ipcp_script_state) {
1924 if (ipcp_fsm[0].state != OPENED) {
1925 ipcp_script_state = s_down;
1926 ipcp_script(_PATH_IPDOWN);
1930 if (ipcp_fsm[0].state == OPENED) {
1931 ipcp_script_state = s_up;
1932 ipcp_script(_PATH_IPUP);
1940 * ipcp_script - Execute a script with arguments
1941 * interface-name tty-name speed local-IP remote-IP.
1947 char strspeed[32], strlocal[32], strremote[32];
1950 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
1951 slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr);
1952 slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr);
1959 argv[5] = strremote;
1962 ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, NULL);
1966 * create_resolv - create the replacement resolv.conf file
1969 create_resolv(peerdns1, peerdns2)
1970 u_int32_t peerdns1, peerdns2;
1974 f = fopen(_PATH_RESOLV, "w");
1976 error("Failed to create %s: %m", _PATH_RESOLV);
1981 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1));
1984 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2));
1987 error("Write failed to %s: %m", _PATH_RESOLV);
1993 * ipcp_printpkt - print the contents of an IPCP packet.
1995 static char *ipcp_codenames[] = {
1996 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1997 "TermReq", "TermAck", "CodeRej"
2001 ipcp_printpkt(p, plen, printer, arg)
2004 void (*printer) __P((void *, char *, ...));
2007 int code, id, len, olen;
2008 u_char *pstart, *optend;
2012 if (plen < HEADERLEN)
2018 if (len < HEADERLEN || len > plen)
2021 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
2022 printer(arg, " %s", ipcp_codenames[code-1]);
2024 printer(arg, " code=0x%x", code);
2025 printer(arg, " id=0x%x", id);
2032 /* print option list */
2037 if (olen < 2 || olen > len) {
2045 if (olen == CILEN_ADDRS) {
2048 printer(arg, "addrs %I", htonl(cilong));
2050 printer(arg, " %I", htonl(cilong));
2053 case CI_COMPRESSTYPE:
2054 if (olen >= CILEN_COMPRESS) {
2056 GETSHORT(cishort, p);
2057 printer(arg, "compress ");
2062 case IPCP_VJ_COMP_OLD:
2063 printer(arg, "old-VJ");
2066 printer(arg, "0x%x", cishort);
2071 if (olen == CILEN_ADDR) {
2074 printer(arg, "addr %I", htonl(cilong));
2081 printer(arg, "ms-dns%d %I", code - CI_MS_DNS1 + 1,
2088 printer(arg, "ms-wins %I", htonl(cilong));
2091 while (p < optend) {
2093 printer(arg, " %.2x", code);
2101 if (len > 0 && *p >= ' ' && *p < 0x7f) {
2103 print_string((char *)p, len, printer, arg);
2110 /* print the rest of the bytes in the packet */
2111 for (; len > 0; --len) {
2113 printer(arg, " %.2x", code);
2120 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
2121 * We don't bring the link up for IP fragments or for TCP FIN packets
2124 #define IP_HDRLEN 20 /* bytes */
2125 #define IP_OFFMASK 0x1fff
2127 #define IPPROTO_TCP 6
2129 #define TCP_HDRLEN 20
2133 * We use these macros because the IP header may be at an odd address,
2134 * and some compilers might use word loads to get th_off or ip_hl.
2137 #define net_short(x) (((x)[0] << 8) + (x)[1])
2138 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
2139 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
2140 #define get_ipproto(x) (((unsigned char *)(x))[9])
2141 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
2142 #define get_tcpflags(x) (((unsigned char *)(x))[13])
2145 ip_active_pkt(pkt, len)
2154 if (len < IP_HDRLEN)
2156 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
2158 if (get_ipproto(pkt) != IPPROTO_TCP)
2160 hlen = get_iphl(pkt) * 4;
2161 if (len < hlen + TCP_HDRLEN)
2164 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)