2 * ipcp.c - PPP IP Control Protocol.
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 static char rcsid[] = "$Id: ipcp.c,v 1.46 1999/05/13 00:35:23 paulus Exp $";
31 #include <sys/param.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
40 #include "pathnames.h"
43 ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */
44 ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
45 ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
46 ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
48 bool disable_defaultip = 0; /* Don't use hostname for default IP adrs */
51 static int default_route_set[NUM_PPP]; /* Have set up a default route */
52 static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */
53 static bool usepeerdns; /* Ask peer for DNS addrs */
54 static int ipcp_is_up; /* have called np_up() */
57 * Callbacks for fsm code. (CI = Configuration Information)
59 static void ipcp_resetci __P((fsm *)); /* Reset our CI */
60 static int ipcp_cilen __P((fsm *)); /* Return length of our CI */
61 static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
62 static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
63 static int ipcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */
64 static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
65 static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
66 static void ipcp_up __P((fsm *)); /* We're UP */
67 static void ipcp_down __P((fsm *)); /* We're DOWN */
68 static void ipcp_finished __P((fsm *)); /* Don't need lower layer */
70 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
72 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
73 ipcp_resetci, /* Reset our Configuration Information */
74 ipcp_cilen, /* Length of our Configuration Information */
75 ipcp_addci, /* Add our Configuration Information */
76 ipcp_ackci, /* ACK our Configuration Information */
77 ipcp_nakci, /* NAK our Configuration Information */
78 ipcp_rejci, /* Reject our Configuration Information */
79 ipcp_reqci, /* Request peer's Configuration Information */
80 ipcp_up, /* Called when fsm reaches OPENED state */
81 ipcp_down, /* Called when fsm leaves OPENED state */
82 NULL, /* Called when we want the lower layer up */
83 ipcp_finished, /* Called when we want the lower layer down */
84 NULL, /* Called when Protocol-Reject received */
85 NULL, /* Retransmission is necessary */
86 NULL, /* Called to handle protocol-specific codes */
87 "IPCP" /* String name of protocol */
91 * Command-line options.
93 static int setvjslots __P((char **));
94 static int setdnsaddr __P((char **));
95 static int setwinsaddr __P((char **));
97 static option_t ipcp_option_list[] = {
98 { "noip", o_bool, &ipcp_protent.enabled_flag,
99 "Disable IP and IPCP" },
100 { "-ip", o_bool, &ipcp_protent.enabled_flag,
101 "Disable IP and IPCP" },
102 { "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
103 "Disable VJ compression", OPT_A2COPY, &ipcp_allowoptions[0].neg_vj },
104 { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
105 "Disable VJ compression", OPT_A2COPY, &ipcp_allowoptions[0].neg_vj },
106 { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
107 "Disable VJ connection-ID compression", OPT_A2COPY,
108 &ipcp_allowoptions[0].cflag },
109 { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
110 "Disable VJ connection-ID compression", OPT_A2COPY,
111 &ipcp_allowoptions[0].cflag },
112 { "vj-max-slots", 1, setvjslots,
113 "Set maximum VJ header slots" },
114 { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local,
115 "Accept peer's address for us", 1 },
116 { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote,
117 "Accept peer's address for it", 1 },
118 { "ipparam", o_string, &ipparam,
119 "Set ip script parameter" },
120 { "noipdefault", o_bool, &disable_defaultip,
121 "Don't use name for default IP adrs", 1 },
122 { "ms-dns", 1, setdnsaddr,
123 "DNS address for the peer's use" },
124 { "ms-wins", 1, setwinsaddr,
125 "Nameserver for SMB over TCP/IP for peer" },
126 { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
127 "Set timeout for IPCP" },
128 { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
129 "Set max #xmits for term-reqs" },
130 { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
131 "Set max #xmits for conf-reqs" },
132 { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
133 "Set max #conf-naks for IPCP" },
134 { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route,
135 "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route },
136 { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route,
137 "disable defaultroute option", OPT_A2COPY,
138 &ipcp_wantoptions[0].default_route },
139 { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
140 "disable defaultroute option", OPT_A2COPY,
141 &ipcp_wantoptions[0].default_route },
142 { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
143 "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
144 { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
145 "disable proxyarp option", OPT_A2COPY,
146 &ipcp_wantoptions[0].proxy_arp },
147 { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
148 "disable proxyarp option", OPT_A2COPY,
149 &ipcp_wantoptions[0].proxy_arp },
150 { "usepeerdns", o_bool, &usepeerdns,
151 "Ask peer for DNS address(es)", 1 },
156 * Protocol entry points from main code.
158 static void ipcp_init __P((int));
159 static void ipcp_open __P((int));
160 static void ipcp_close __P((int, char *));
161 static void ipcp_lowerup __P((int));
162 static void ipcp_lowerdown __P((int));
163 static void ipcp_input __P((int, u_char *, int));
164 static void ipcp_protrej __P((int));
165 static int ipcp_printpkt __P((u_char *, int,
166 void (*) __P((void *, char *, ...)), void *));
167 static void ip_check_options __P((void));
168 static int ip_demand_conf __P((int));
169 static int ip_active_pkt __P((u_char *, int));
170 static void create_resolv __P((u_int32_t, u_int32_t));
172 struct protent ipcp_protent = {
192 static void ipcp_clear_addrs __P((int));
193 static void ipcp_script __P((char *)); /* Run an up/down script */
194 static void ipcp_script_done __P((void *));
197 * Lengths of configuration options.
200 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
201 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
202 #define CILEN_ADDR 6 /* new-style single address option */
203 #define CILEN_ADDRS 10 /* old-style dual address option */
206 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
207 (x) == CONFNAK ? "NAK" : "REJ")
210 * This state variable is used to ensure that we don't
211 * run an ipcp-up/down script while one is already running.
213 static enum script_state {
217 static pid_t ipcp_script_pid;
220 * Make a string representation of a network IP address.
228 slprintf(b, sizeof(b), "%I", ipaddr);
237 * setvjslots - set maximum number of connection slots for VJ compression
245 if (!int_option(*argv, &value))
247 if (value < 2 || value > 16) {
248 option_error("vj-max-slots value must be between 2 and 16");
251 ipcp_wantoptions [0].maxslotindex =
252 ipcp_allowoptions[0].maxslotindex = value - 1;
257 * setdnsaddr - set the dns address(es)
266 dns = inet_addr(*argv);
268 if ((hp = gethostbyname(*argv)) == NULL) {
269 option_error("invalid address parameter '%s' for ms-dns option",
273 dns = *(u_int32_t *)hp->h_addr;
276 /* if there is no primary then update it. */
277 if (ipcp_allowoptions[0].dnsaddr[0] == 0)
278 ipcp_allowoptions[0].dnsaddr[0] = dns;
280 /* always set the secondary address value to the same value. */
281 ipcp_allowoptions[0].dnsaddr[1] = dns;
287 * setwinsaddr - set the wins address(es)
288 * This is primrarly used with the Samba package under UNIX or for pointing
289 * the caller to the existing WINS server on a Windows NT platform.
298 wins = inet_addr(*argv);
300 if ((hp = gethostbyname(*argv)) == NULL) {
301 option_error("invalid address parameter '%s' for ms-wins option",
305 wins = *(u_int32_t *)hp->h_addr;
308 /* if there is no primary then update it. */
309 if (ipcp_allowoptions[0].winsaddr[0] == 0)
310 ipcp_allowoptions[0].winsaddr[0] = wins;
312 /* always set the secondary address value to the same value. */
313 ipcp_allowoptions[0].winsaddr[1] = wins;
320 * ipcp_init - Initialize IPCP.
326 fsm *f = &ipcp_fsm[unit];
327 ipcp_options *wo = &ipcp_wantoptions[unit];
328 ipcp_options *ao = &ipcp_allowoptions[unit];
331 f->protocol = PPP_IPCP;
332 f->callbacks = &ipcp_callbacks;
333 fsm_init(&ipcp_fsm[unit]);
335 memset(wo, 0, sizeof(*wo));
336 memset(ao, 0, sizeof(*ao));
340 wo->vj_protocol = IPCP_VJ_COMP;
341 wo->maxslotindex = MAX_STATES - 1; /* really max index */
345 /* max slots and slot-id compression are currently hardwired in */
346 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
351 ao->maxslotindex = MAX_STATES - 1;
355 * XXX These control whether the user may use the proxyarp
356 * and defaultroute options.
359 ao->default_route = 1;
364 * ipcp_open - IPCP is allowed to come up.
370 fsm_open(&ipcp_fsm[unit]);
375 * ipcp_close - Take IPCP down.
378 ipcp_close(unit, reason)
382 fsm_close(&ipcp_fsm[unit], reason);
387 * ipcp_lowerup - The lower layer is up.
393 fsm_lowerup(&ipcp_fsm[unit]);
398 * ipcp_lowerdown - The lower layer is down.
404 fsm_lowerdown(&ipcp_fsm[unit]);
409 * ipcp_input - Input IPCP packet.
412 ipcp_input(unit, p, len)
417 fsm_input(&ipcp_fsm[unit], p, len);
422 * ipcp_protrej - A Protocol-Reject was received for IPCP.
424 * Pretend the lower layer went down, so we shut up.
430 fsm_lowerdown(&ipcp_fsm[unit]);
435 * ipcp_resetci - Reset our CI.
436 * Called by fsm_sconfreq, Send Configure Request.
442 ipcp_options *wo = &ipcp_wantoptions[f->unit];
444 wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
445 if (wo->ouraddr == 0)
446 wo->accept_local = 1;
447 if (wo->hisaddr == 0)
448 wo->accept_remote = 1;
449 wo->req_dns1 = usepeerdns; /* Request DNS addresses from the peer */
450 wo->req_dns2 = usepeerdns;
451 ipcp_gotoptions[f->unit] = *wo;
456 * ipcp_cilen - Return length of our CI.
457 * Called by fsm_sconfreq, Send Configure Request.
463 ipcp_options *go = &ipcp_gotoptions[f->unit];
464 ipcp_options *wo = &ipcp_wantoptions[f->unit];
465 ipcp_options *ho = &ipcp_hisoptions[f->unit];
467 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
468 #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
469 #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
472 * First see if we want to change our options to the old
473 * forms because we have received old forms from the peer.
475 if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
476 /* use the old style of address negotiation */
480 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
481 /* try an older style of VJ negotiation */
482 /* use the old style only if the peer did */
483 if (ho->neg_vj && ho->old_vj) {
486 go->vj_protocol = ho->vj_protocol;
490 return (LENCIADDR(go->neg_addr, go->old_addrs) +
491 LENCIVJ(go->neg_vj, go->old_vj) +
492 LENCIDNS(go->req_dns1) +
493 LENCIDNS(go->req_dns2)) ;
498 * ipcp_addci - Add our desired CIs to a packet.
499 * Called by fsm_sconfreq, Send Configure Request.
502 ipcp_addci(f, ucp, lenp)
507 ipcp_options *go = &ipcp_gotoptions[f->unit];
510 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
512 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
513 if (len >= vjlen) { \
515 PUTCHAR(vjlen, ucp); \
516 PUTSHORT(val, ucp); \
518 PUTCHAR(maxslotindex, ucp); \
519 PUTCHAR(cflag, ucp); \
526 #define ADDCIADDR(opt, neg, old, val1, val2) \
528 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
529 if (len >= addrlen) { \
532 PUTCHAR(addrlen, ucp); \
544 #define ADDCIDNS(opt, neg, addr) \
546 if (len >= CILEN_ADDR) { \
549 PUTCHAR(CILEN_ADDR, ucp); \
557 ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
558 go->old_addrs, go->ouraddr, go->hisaddr);
560 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
561 go->maxslotindex, go->cflag);
563 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
565 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
572 * ipcp_ackci - Ack our CIs.
573 * Called by fsm_rconfack, Receive Configure ACK.
580 ipcp_ackci(f, p, len)
585 ipcp_options *go = &ipcp_gotoptions[f->unit];
586 u_short cilen, citype, cishort;
588 u_char cimaxslotindex, cicflag;
591 * CIs must be in exactly the same order that we sent...
592 * Check packet length and CI length at each step.
593 * If we find any deviations, then this packet is bad.
596 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
598 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
599 if ((len -= vjlen) < 0) \
601 GETCHAR(citype, p); \
603 if (cilen != vjlen || \
606 GETSHORT(cishort, p); \
607 if (cishort != val) \
610 GETCHAR(cimaxslotindex, p); \
611 if (cimaxslotindex != maxslotindex) \
613 GETCHAR(cicflag, p); \
614 if (cicflag != cflag) \
619 #define ACKCIADDR(opt, neg, old, val1, val2) \
621 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
623 if ((len -= addrlen) < 0) \
625 GETCHAR(citype, p); \
627 if (cilen != addrlen || \
632 if (val1 != cilong) \
637 if (val2 != cilong) \
642 #define ACKCIDNS(opt, neg, addr) \
645 if ((len -= CILEN_ADDR) < 0) \
647 GETCHAR(citype, p); \
649 if (cilen != CILEN_ADDR || citype != opt) \
653 if (addr != cilong) \
657 ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
658 go->old_addrs, go->ouraddr, go->hisaddr);
660 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
661 go->maxslotindex, go->cflag);
663 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
665 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
668 * If there are any remaining CIs, then this packet is bad.
675 IPCPDEBUG(("ipcp_ackci: received bad Ack!"));
680 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
681 * This should not modify any state if the Nak is bad
682 * or if IPCP is in the OPENED state.
683 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
690 ipcp_nakci(f, p, len)
695 ipcp_options *go = &ipcp_gotoptions[f->unit];
696 u_char cimaxslotindex, cicflag;
697 u_char citype, cilen, *next;
699 u_int32_t ciaddr1, ciaddr2, l, cidnsaddr;
700 ipcp_options no; /* options we've seen Naks for */
701 ipcp_options try; /* options to request next time */
703 BZERO(&no, sizeof(no));
707 * Any Nak'd CIs must be in exactly the same order that we sent.
708 * Check packet length and CI length at each step.
709 * If we find any deviations, then this packet is bad.
711 #define NAKCIADDR(opt, neg, old, code) \
713 len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
719 ciaddr1 = htonl(l); \
722 ciaddr2 = htonl(l); \
730 #define NAKCIVJ(opt, neg, code) \
732 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
737 GETSHORT(cishort, p); \
742 #define NAKCIDNS(opt, neg, code) \
744 ((cilen = p[1]) == CILEN_ADDR) && \
750 cidnsaddr = htonl(l); \
756 * Accept the peer's idea of {our,his} address, if different
757 * from our idea, only if the accept_{local,remote} flag is set.
759 NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
760 if (go->accept_local && ciaddr1) { /* Do we know our address? */
761 try.ouraddr = ciaddr1;
763 if (go->accept_remote && ciaddr2) { /* Does he know his? */
764 try.hisaddr = ciaddr2;
769 * Accept the peer's value of maxslotindex provided that it
770 * is less than what we asked for. Turn off slot-ID compression
771 * if the peer wants. Send old-style compress-type option if
774 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
775 if (cilen == CILEN_VJ) {
776 GETCHAR(cimaxslotindex, p);
778 if (cishort == IPCP_VJ_COMP) {
780 if (cimaxslotindex < go->maxslotindex)
781 try.maxslotindex = cimaxslotindex;
788 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
790 try.vj_protocol = cishort;
797 NAKCIDNS(CI_MS_DNS1, req_dns1,
798 try.dnsaddr[0] = cidnsaddr;
801 NAKCIDNS(CI_MS_DNS2, req_dns2,
802 try.dnsaddr[1] = cidnsaddr;
806 * There may be remaining CIs, if the peer is requesting negotiation
807 * on an option that we didn't include in our request packet.
808 * If they want to negotiate about IP addresses, we comply.
809 * If they want us to ask for compression, we refuse.
811 while (len > CILEN_VOID) {
814 if( (len -= cilen) < 0 )
816 next = p + cilen - 2;
819 case CI_COMPRESSTYPE:
820 if (go->neg_vj || no.neg_vj ||
821 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
826 if ((go->neg_addr && go->old_addrs) || no.old_addrs
827 || cilen != CILEN_ADDRS)
833 if (ciaddr1 && go->accept_local)
834 try.ouraddr = ciaddr1;
837 if (ciaddr2 && go->accept_remote)
838 try.hisaddr = ciaddr2;
842 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
847 if (ciaddr1 && go->accept_local)
848 try.ouraddr = ciaddr1;
849 if (try.ouraddr != 0)
858 * OK, the Nak is good. Now we can update state.
859 * If there are any remaining options, we ignore them.
861 if (f->state != OPENED)
867 IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
873 * ipcp_rejci - Reject some of our CIs.
874 * Callback from fsm_rconfnakrej.
877 ipcp_rejci(f, p, len)
882 ipcp_options *go = &ipcp_gotoptions[f->unit];
883 u_char cimaxslotindex, ciflag, cilen;
886 ipcp_options try; /* options to request next time */
890 * Any Rejected CIs must be in exactly the same order that we sent.
891 * Check packet length and CI length at each step.
892 * If we find any deviations, then this packet is bad.
894 #define REJCIADDR(opt, neg, old, val1, val2) \
896 len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
904 /* Check rejected value. */ \
905 if (cilong != val1) \
910 /* Check rejected value. */ \
911 if (cilong != val2) \
917 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
919 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
924 GETSHORT(cishort, p); \
925 /* Check rejected value. */ \
926 if (cishort != val) \
929 GETCHAR(cimaxslotindex, p); \
930 if (cimaxslotindex != maxslot) \
932 GETCHAR(ciflag, p); \
933 if (ciflag != cflag) \
939 #define REJCIDNS(opt, neg, dnsaddr) \
941 ((cilen = p[1]) == CILEN_ADDR) && \
949 /* Check rejected value. */ \
950 if (cilong != dnsaddr) \
956 REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
957 go->old_addrs, go->ouraddr, go->hisaddr);
959 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
960 go->maxslotindex, go->cflag);
962 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
964 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
967 * If there are any remaining CIs, then this packet is bad.
972 * Now we can update state.
974 if (f->state != OPENED)
979 IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
985 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
986 * Callback from fsm_rconfreq, Receive Configure Request
988 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
989 * appropriately. If reject_if_disagree is non-zero, doesn't return
990 * CONFNAK; returns CONFREJ if it can't return CONFACK.
993 ipcp_reqci(f, inp, len, reject_if_disagree)
995 u_char *inp; /* Requested CIs */
996 int *len; /* Length of requested CIs */
997 int reject_if_disagree;
999 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1000 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1001 ipcp_options *ao = &ipcp_allowoptions[f->unit];
1002 ipcp_options *go = &ipcp_gotoptions[f->unit];
1003 u_char *cip, *next; /* Pointer to current and next CIs */
1004 u_short cilen, citype; /* Parsed len, type */
1005 u_short cishort; /* Parsed short value */
1006 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
1007 int rc = CONFACK; /* Final packet return code */
1008 int orc; /* Individual option return code */
1009 u_char *p; /* Pointer to next char to parse */
1010 u_char *ucp = inp; /* Pointer to current output char */
1011 int l = *len; /* Length left */
1012 u_char maxslotindex, cflag;
1016 * Reset all his options.
1018 BZERO(ho, sizeof(*ho));
1021 * Process all his options.
1025 orc = CONFACK; /* Assume success */
1026 cip = p = next; /* Remember begining of CI */
1027 if (l < 2 || /* Not enough data for CI header or */
1028 p[1] < 2 || /* CI length too small or */
1029 p[1] > l) { /* CI length too big? */
1030 IPCPDEBUG(("ipcp_reqci: bad CI length!"));
1031 orc = CONFREJ; /* Reject bad CI */
1032 cilen = l; /* Reject till end of packet */
1033 l = 0; /* Don't loop again */
1036 GETCHAR(citype, p); /* Parse CI type */
1037 GETCHAR(cilen, p); /* Parse CI length */
1038 l -= cilen; /* Adjust remaining length */
1039 next += cilen; /* Step to next CI */
1041 switch (citype) { /* Check CI type */
1043 if (!ao->neg_addr ||
1044 cilen != CILEN_ADDRS) { /* Check CI length */
1045 orc = CONFREJ; /* Reject CI */
1050 * If he has no address, or if we both have his address but
1051 * disagree about it, then NAK it with our idea.
1052 * In particular, if we don't know his address, but he does,
1055 GETLONG(tl, p); /* Parse source address (his) */
1056 ciaddr1 = htonl(tl);
1057 if (ciaddr1 != wo->hisaddr
1058 && (ciaddr1 == 0 || !wo->accept_remote)) {
1060 if (!reject_if_disagree) {
1061 DECPTR(sizeof(u_int32_t), p);
1062 tl = ntohl(wo->hisaddr);
1065 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1067 * If neither we nor he knows his address, reject the option.
1070 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1075 * If he doesn't know our address, or if we both have our address
1076 * but disagree about it, then NAK it with our idea.
1078 GETLONG(tl, p); /* Parse desination address (ours) */
1079 ciaddr2 = htonl(tl);
1080 if (ciaddr2 != wo->ouraddr) {
1081 if (ciaddr2 == 0 || !wo->accept_local) {
1083 if (!reject_if_disagree) {
1084 DECPTR(sizeof(u_int32_t), p);
1085 tl = ntohl(wo->ouraddr);
1089 go->ouraddr = ciaddr2; /* accept peer's idea */
1095 ho->hisaddr = ciaddr1;
1096 ho->ouraddr = ciaddr2;
1100 if (!ao->neg_addr ||
1101 cilen != CILEN_ADDR) { /* Check CI length */
1102 orc = CONFREJ; /* Reject CI */
1107 * If he has no address, or if we both have his address but
1108 * disagree about it, then NAK it with our idea.
1109 * In particular, if we don't know his address, but he does,
1112 GETLONG(tl, p); /* Parse source address (his) */
1113 ciaddr1 = htonl(tl);
1114 if (ciaddr1 != wo->hisaddr
1115 && (ciaddr1 == 0 || !wo->accept_remote)) {
1117 if (!reject_if_disagree) {
1118 DECPTR(sizeof(u_int32_t), p);
1119 tl = ntohl(wo->hisaddr);
1122 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1124 * Don't ACK an address of 0.0.0.0 - reject it instead.
1127 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1132 ho->hisaddr = ciaddr1;
1137 /* Microsoft primary or secondary DNS request */
1138 d = citype == CI_MS_DNS2;
1140 /* If we do not have a DNS address then we cannot send it */
1141 if (ao->dnsaddr[d] == 0 ||
1142 cilen != CILEN_ADDR) { /* Check CI length */
1143 orc = CONFREJ; /* Reject CI */
1147 if (htonl(tl) != ao->dnsaddr[d]) {
1148 DECPTR(sizeof(u_int32_t), p);
1149 tl = ntohl(ao->dnsaddr[d]);
1157 /* Microsoft primary or secondary WINS request */
1158 d = citype == CI_MS_WINS2;
1160 /* If we do not have a DNS address then we cannot send it */
1161 if (ao->winsaddr[d] == 0 ||
1162 cilen != CILEN_ADDR) { /* Check CI length */
1163 orc = CONFREJ; /* Reject CI */
1167 if (htonl(tl) != ao->winsaddr[d]) {
1168 DECPTR(sizeof(u_int32_t), p);
1169 tl = ntohl(ao->winsaddr[d]);
1175 case CI_COMPRESSTYPE:
1177 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
1181 GETSHORT(cishort, p);
1183 if (!(cishort == IPCP_VJ_COMP ||
1184 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1190 ho->vj_protocol = cishort;
1191 if (cilen == CILEN_VJ) {
1192 GETCHAR(maxslotindex, p);
1193 if (maxslotindex > ao->maxslotindex) {
1195 if (!reject_if_disagree){
1197 PUTCHAR(ao->maxslotindex, p);
1201 if (cflag && !ao->cflag) {
1203 if (!reject_if_disagree){
1205 PUTCHAR(wo->cflag, p);
1208 ho->maxslotindex = maxslotindex;
1212 ho->maxslotindex = MAX_STATES - 1;
1222 if (orc == CONFACK && /* Good CI */
1223 rc != CONFACK) /* but prior CI wasnt? */
1224 continue; /* Don't send this one */
1226 if (orc == CONFNAK) { /* Nak this CI? */
1227 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1228 orc = CONFREJ; /* Get tough if so */
1230 if (rc == CONFREJ) /* Rejecting prior CI? */
1231 continue; /* Don't send this one */
1232 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1233 rc = CONFNAK; /* Not anymore... */
1234 ucp = inp; /* Backup */
1239 if (orc == CONFREJ && /* Reject this CI */
1240 rc != CONFREJ) { /* but no prior ones? */
1242 ucp = inp; /* Backup */
1245 /* Need to move CI? */
1247 BCOPY(cip, ucp, cilen); /* Move it */
1249 /* Update output pointer */
1254 * If we aren't rejecting this packet, and we want to negotiate
1255 * their address, and they didn't send their address, then we
1256 * send a NAK with a CI_ADDR option appended. We assume the
1257 * input buffer is long enough that we can append the extra
1260 if (rc != CONFREJ && !ho->neg_addr &&
1261 wo->req_addr && !reject_if_disagree) {
1262 if (rc == CONFACK) {
1264 ucp = inp; /* reset pointer */
1265 wo->req_addr = 0; /* don't ask again */
1267 PUTCHAR(CI_ADDR, ucp);
1268 PUTCHAR(CILEN_ADDR, ucp);
1269 tl = ntohl(wo->hisaddr);
1273 *len = ucp - inp; /* Compute output length */
1274 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
1275 return (rc); /* Return final code */
1280 * ip_check_options - check that any IP-related options are OK,
1281 * and assign appropriate defaults.
1288 ipcp_options *wo = &ipcp_wantoptions[0];
1291 * Default our local IP address based on our hostname.
1292 * If local IP address already given, don't bother.
1294 if (wo->ouraddr == 0 && !disable_defaultip) {
1296 * Look up our hostname (possibly with domain name appended)
1297 * and take the first IP address as our local IP address.
1298 * If there isn't an IP address for our hostname, too bad.
1300 wo->accept_local = 1; /* don't insist on this default value */
1301 if ((hp = gethostbyname(hostname)) != NULL) {
1302 local = *(u_int32_t *)hp->h_addr;
1303 if (local != 0 && !bad_ip_adrs(local))
1304 wo->ouraddr = local;
1308 if (demand && wo->hisaddr == 0) {
1309 option_error("remote IP address required for demand-dialling\n");
1313 if (demand && wo->accept_remote) {
1314 option_error("ipcp-accept-remote is incompatible with demand\n");
1322 * ip_demand_conf - configure the interface as though
1323 * IPCP were up, for use with dial-on-demand.
1329 ipcp_options *wo = &ipcp_wantoptions[u];
1331 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1335 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1337 if (wo->default_route)
1338 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1339 default_route_set[u] = 1;
1341 if (sifproxyarp(u, wo->hisaddr))
1342 proxy_arp_set[u] = 1;
1344 notice("local IP address %I", wo->ouraddr);
1345 notice("remote IP address %I", wo->hisaddr);
1352 * ipcp_up - IPCP has come UP.
1354 * Configure the IP network interface appropriately and bring it up.
1361 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1362 ipcp_options *go = &ipcp_gotoptions[f->unit];
1363 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1365 IPCPDEBUG(("ipcp: up"));
1368 * We must have a non-zero IP address for both ends of the link.
1371 ho->hisaddr = wo->hisaddr;
1373 if (ho->hisaddr == 0) {
1374 error("Could not determine remote IP address");
1375 ipcp_close(f->unit, "Could not determine remote IP address");
1378 if (go->ouraddr == 0) {
1379 error("Could not determine local IP address");
1380 ipcp_close(f->unit, "Could not determine local IP address");
1383 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr));
1384 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr));
1386 if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1387 script_setenv("USEPEERDNS", "1");
1389 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]));
1391 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]));
1392 create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
1396 * Check that the peer is allowed to use the IP address it wants.
1398 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1399 error("Peer is not authorized to use remote address %I", ho->hisaddr);
1400 ipcp_close(f->unit, "Unauthorized remote IP address");
1404 /* set tcp compression */
1405 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1408 * If we are doing dial-on-demand, the interface is already
1409 * configured, so we put out any saved-up packets, then set the
1410 * interface to pass IP packets.
1413 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1414 if (go->ouraddr != wo->ouraddr) {
1415 warn("Local IP address changed to %I", go->ouraddr);
1416 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr));
1417 wo->ouraddr = go->ouraddr;
1419 script_unsetenv("OLDIPLOCAL");
1420 if (ho->hisaddr != wo->hisaddr) {
1421 warn("Remote IP address changed to %I", ho->hisaddr);
1422 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr));
1423 wo->hisaddr = ho->hisaddr;
1425 script_unsetenv("OLDIPREMOTE");
1426 ipcp_clear_addrs(f->unit);
1428 /* Set the interface to the new addresses */
1429 mask = GetMask(go->ouraddr);
1430 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1432 warn("Interface configuration failed");
1433 ipcp_close(f->unit, "Interface configuration failed");
1437 /* assign a default route through the interface if required */
1438 if (ipcp_wantoptions[f->unit].default_route)
1439 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1440 default_route_set[f->unit] = 1;
1442 /* Make a proxy ARP entry if requested. */
1443 if (ipcp_wantoptions[f->unit].proxy_arp)
1444 if (sifproxyarp(f->unit, ho->hisaddr))
1445 proxy_arp_set[f->unit] = 1;
1448 demand_rexmit(PPP_IP);
1449 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1453 * Set IP addresses and (if specified) netmask.
1455 mask = GetMask(go->ouraddr);
1457 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1458 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1460 warn("Interface configuration failed");
1461 ipcp_close(f->unit, "Interface configuration failed");
1466 /* bring the interface up for IP */
1467 if (!sifup(f->unit)) {
1469 warn("Interface failed to come up");
1470 ipcp_close(f->unit, "Interface configuration failed");
1474 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1475 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1477 warn("Interface configuration failed");
1478 ipcp_close(f->unit, "Interface configuration failed");
1482 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1484 /* assign a default route through the interface if required */
1485 if (ipcp_wantoptions[f->unit].default_route)
1486 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1487 default_route_set[f->unit] = 1;
1489 /* Make a proxy ARP entry if requested. */
1490 if (ipcp_wantoptions[f->unit].proxy_arp)
1491 if (sifproxyarp(f->unit, ho->hisaddr))
1492 proxy_arp_set[f->unit] = 1;
1494 notice("local IP address %I", go->ouraddr);
1495 notice("remote IP address %I", ho->hisaddr);
1497 notice("primary DNS address %I", go->dnsaddr[0]);
1499 notice("secondary DNS address %I", go->dnsaddr[1]);
1502 np_up(f->unit, PPP_IP);
1506 * Execute the ip-up script, like this:
1507 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1509 if (ipcp_script_state == s_down && ipcp_script_pid == 0) {
1510 ipcp_script_state = s_up;
1511 ipcp_script(_PATH_IPUP);
1517 * ipcp_down - IPCP has gone DOWN.
1519 * Take the IP network interface down, clear its addresses
1520 * and delete routes through it.
1526 IPCPDEBUG(("ipcp: down"));
1527 /* XXX a bit IPv4-centric here, we only need to get the stats
1528 * before the interface is marked down. */
1529 update_link_stats(f->unit);
1532 np_down(f->unit, PPP_IP);
1534 sifvjcomp(f->unit, 0, 0, 0);
1537 * If we are doing dial-on-demand, set the interface
1538 * to queue up outgoing packets (for now).
1541 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1544 ipcp_clear_addrs(f->unit);
1547 /* Execute the ip-down script */
1548 if (ipcp_script_state == s_up && ipcp_script_pid == 0) {
1549 ipcp_script_state = s_down;
1550 ipcp_script(_PATH_IPDOWN);
1556 * ipcp_clear_addrs() - clear the interface addresses, routes,
1557 * proxy arp entries, etc.
1560 ipcp_clear_addrs(unit)
1563 u_int32_t ouraddr, hisaddr;
1565 ouraddr = ipcp_gotoptions[unit].ouraddr;
1566 hisaddr = ipcp_hisoptions[unit].hisaddr;
1567 if (proxy_arp_set[unit]) {
1568 cifproxyarp(unit, hisaddr);
1569 proxy_arp_set[unit] = 0;
1571 if (default_route_set[unit]) {
1572 cifdefaultroute(unit, ouraddr, hisaddr);
1573 default_route_set[unit] = 0;
1575 cifaddr(unit, ouraddr, hisaddr);
1580 * ipcp_finished - possibly shut down the lower layers.
1586 np_finished(f->unit, PPP_IP);
1591 * ipcp_script_done - called when the ip-up or ip-down script
1595 ipcp_script_done(arg)
1598 ipcp_script_pid = 0;
1599 switch (ipcp_script_state) {
1601 if (ipcp_fsm[0].state != OPENED) {
1602 ipcp_script_state = s_down;
1603 ipcp_script(_PATH_IPDOWN);
1607 if (ipcp_fsm[0].state == OPENED) {
1608 ipcp_script_state = s_up;
1609 ipcp_script(_PATH_IPUP);
1617 * ipcp_script - Execute a script with arguments
1618 * interface-name tty-name speed local-IP remote-IP.
1624 char strspeed[32], strlocal[32], strremote[32];
1627 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
1628 slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr);
1629 slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr);
1636 argv[5] = strremote;
1639 ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, NULL);
1643 * create_resolv - create the replacement resolv.conf file
1646 create_resolv(peerdns1, peerdns2)
1647 u_int32_t peerdns1, peerdns2;
1651 f = fopen(_PATH_RESOLV, "w");
1653 error("Failed to create %s: %m", _PATH_RESOLV);
1658 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1));
1661 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2));
1664 error("Write failed to %s: %m", _PATH_RESOLV);
1670 * ipcp_printpkt - print the contents of an IPCP packet.
1672 static char *ipcp_codenames[] = {
1673 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1674 "TermReq", "TermAck", "CodeRej"
1678 ipcp_printpkt(p, plen, printer, arg)
1681 void (*printer) __P((void *, char *, ...));
1684 int code, id, len, olen;
1685 u_char *pstart, *optend;
1689 if (plen < HEADERLEN)
1695 if (len < HEADERLEN || len > plen)
1698 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
1699 printer(arg, " %s", ipcp_codenames[code-1]);
1701 printer(arg, " code=0x%x", code);
1702 printer(arg, " id=0x%x", id);
1709 /* print option list */
1714 if (olen < 2 || olen > len) {
1722 if (olen == CILEN_ADDRS) {
1725 printer(arg, "addrs %I", htonl(cilong));
1727 printer(arg, " %I", htonl(cilong));
1730 case CI_COMPRESSTYPE:
1731 if (olen >= CILEN_COMPRESS) {
1733 GETSHORT(cishort, p);
1734 printer(arg, "compress ");
1739 case IPCP_VJ_COMP_OLD:
1740 printer(arg, "old-VJ");
1743 printer(arg, "0x%x", cishort);
1748 if (olen == CILEN_ADDR) {
1751 printer(arg, "addr %I", htonl(cilong));
1758 printer(arg, "ms-dns%d %I", code - CI_MS_DNS1 + 1,
1765 printer(arg, "ms-wins %I", htonl(cilong));
1768 while (p < optend) {
1770 printer(arg, " %.2x", code);
1778 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1780 print_string(p, len, printer, arg);
1787 /* print the rest of the bytes in the packet */
1788 for (; len > 0; --len) {
1790 printer(arg, " %.2x", code);
1797 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
1798 * We don't bring the link up for IP fragments or for TCP FIN packets
1801 #define IP_HDRLEN 20 /* bytes */
1802 #define IP_OFFMASK 0x1fff
1803 #define IPPROTO_TCP 6
1804 #define TCP_HDRLEN 20
1808 * We use these macros because the IP header may be at an odd address,
1809 * and some compilers might use word loads to get th_off or ip_hl.
1812 #define net_short(x) (((x)[0] << 8) + (x)[1])
1813 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
1814 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
1815 #define get_ipproto(x) (((unsigned char *)(x))[9])
1816 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1817 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1820 ip_active_pkt(pkt, len)
1829 if (len < IP_HDRLEN)
1831 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
1833 if (get_ipproto(pkt) != IPPROTO_TCP)
1835 hlen = get_iphl(pkt) * 4;
1836 if (len < hlen + TCP_HDRLEN)
1839 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)