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 1.44 1999/04/12 06:24:45 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 cis_received[NUM_PPP]; /* # Conf-Reqs received */
52 static int default_route_set[NUM_PPP]; /* Have set up a default route */
53 static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */
54 static bool usepeerdns; /* Ask peer for DNS addrs */
55 static int ipcp_is_up; /* have called np_up() */
58 * Callbacks for fsm code. (CI = Configuration Information)
60 static void ipcp_resetci __P((fsm *)); /* Reset our CI */
61 static int ipcp_cilen __P((fsm *)); /* Return length of our CI */
62 static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
63 static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
64 static int ipcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */
65 static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
66 static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
67 static void ipcp_up __P((fsm *)); /* We're UP */
68 static void ipcp_down __P((fsm *)); /* We're DOWN */
69 static void ipcp_finished __P((fsm *)); /* Don't need lower layer */
71 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
73 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
74 ipcp_resetci, /* Reset our Configuration Information */
75 ipcp_cilen, /* Length of our Configuration Information */
76 ipcp_addci, /* Add our Configuration Information */
77 ipcp_ackci, /* ACK our Configuration Information */
78 ipcp_nakci, /* NAK our Configuration Information */
79 ipcp_rejci, /* Reject our Configuration Information */
80 ipcp_reqci, /* Request peer's Configuration Information */
81 ipcp_up, /* Called when fsm reaches OPENED state */
82 ipcp_down, /* Called when fsm leaves OPENED state */
83 NULL, /* Called when we want the lower layer up */
84 ipcp_finished, /* Called when we want the lower layer down */
85 NULL, /* Called when Protocol-Reject received */
86 NULL, /* Retransmission is necessary */
87 NULL, /* Called to handle protocol-specific codes */
88 "IPCP" /* String name of protocol */
92 * Command-line options.
94 static int setvjslots __P((char **));
95 static int setdnsaddr __P((char **));
96 static int setwinsaddr __P((char **));
98 static option_t ipcp_option_list[] = {
99 { "noip", o_bool, &ipcp_protent.enabled_flag,
100 "Disable IP and IPCP" },
101 { "-ip", o_bool, &ipcp_protent.enabled_flag,
102 "Disable IP and IPCP" },
103 { "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
104 "Disable VJ compression", OPT_A2COPY, &ipcp_allowoptions[0].neg_vj },
105 { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
106 "Disable VJ compression", OPT_A2COPY, &ipcp_allowoptions[0].neg_vj },
107 { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
108 "Disable VJ connection-ID compression", OPT_A2COPY,
109 &ipcp_allowoptions[0].cflag },
110 { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
111 "Disable VJ connection-ID compression", OPT_A2COPY,
112 &ipcp_allowoptions[0].cflag },
113 { "vj-max-slots", 1, setvjslots,
114 "Set maximum VJ header slots" },
115 { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local,
116 "Accept peer's address for us", 1 },
117 { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote,
118 "Accept peer's address for it", 1 },
119 { "ipparam", o_string, &ipparam,
120 "Set ip script parameter" },
121 { "noipdefault", o_bool, &disable_defaultip,
122 "Don't use name for default IP adrs", 1 },
123 { "ms-dns", 1, setdnsaddr,
124 "DNS address for the peer's use" },
125 { "ms-wins", 1, setwinsaddr,
126 "Nameserver for SMB over TCP/IP for peer" },
127 { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
128 "Set timeout for IPCP" },
129 { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
130 "Set max #xmits for term-reqs" },
131 { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
132 "Set max #xmits for conf-reqs" },
133 { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
134 "Set max #conf-naks for IPCP" },
135 { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route,
136 "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route },
137 { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route,
138 "disable defaultroute option", OPT_A2COPY,
139 &ipcp_wantoptions[0].default_route },
140 { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
141 "disable defaultroute option", OPT_A2COPY,
142 &ipcp_wantoptions[0].default_route },
143 { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
144 "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
145 { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
146 "disable proxyarp option", OPT_A2COPY,
147 &ipcp_wantoptions[0].proxy_arp },
148 { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
149 "disable proxyarp option", OPT_A2COPY,
150 &ipcp_wantoptions[0].proxy_arp },
151 { "usepeerdns", o_bool, &usepeerdns,
152 "Ask peer for DNS address(es)", 1 },
157 * Protocol entry points from main code.
159 static void ipcp_init __P((int));
160 static void ipcp_open __P((int));
161 static void ipcp_close __P((int, char *));
162 static void ipcp_lowerup __P((int));
163 static void ipcp_lowerdown __P((int));
164 static void ipcp_input __P((int, u_char *, int));
165 static void ipcp_protrej __P((int));
166 static int ipcp_printpkt __P((u_char *, int,
167 void (*) __P((void *, char *, ...)), void *));
168 static void ip_check_options __P((void));
169 static int ip_demand_conf __P((int));
170 static int ip_active_pkt __P((u_char *, int));
171 static void create_resolv __P((u_int32_t, u_int32_t));
173 struct protent ipcp_protent = {
193 static void ipcp_clear_addrs __P((int));
194 static void ipcp_script __P((char *)); /* Run an up/down script */
195 static void ipcp_script_done __P((void *));
198 * Lengths of configuration options.
201 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
202 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
203 #define CILEN_ADDR 6 /* new-style single address option */
204 #define CILEN_ADDRS 10 /* old-style dual address option */
207 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
208 (x) == CONFNAK ? "NAK" : "REJ")
211 * This state variable is used to ensure that we don't
212 * run an ipcp-up/down script while one is already running.
214 static enum script_state {
218 static pid_t ipcp_script_pid;
221 * Make a string representation of a network IP address.
229 slprintf(b, sizeof(b), "%I", ipaddr);
238 * setvjslots - set maximum number of connection slots for VJ compression
246 if (!int_option(*argv, &value))
248 if (value < 2 || value > 16) {
249 option_error("vj-max-slots value must be between 2 and 16");
252 ipcp_wantoptions [0].maxslotindex =
253 ipcp_allowoptions[0].maxslotindex = value - 1;
258 * setdnsaddr - set the dns address(es)
267 dns = inet_addr(*argv);
269 if ((hp = gethostbyname(*argv)) == NULL) {
270 option_error("invalid address parameter '%s' for ms-dns option",
274 dns = *(u_int32_t *)hp->h_addr;
277 /* if there is no primary then update it. */
278 if (ipcp_allowoptions[0].dnsaddr[0] == 0)
279 ipcp_allowoptions[0].dnsaddr[0] = dns;
281 /* always set the secondary address value to the same value. */
282 ipcp_allowoptions[0].dnsaddr[1] = dns;
288 * setwinsaddr - set the wins address(es)
289 * This is primrarly used with the Samba package under UNIX or for pointing
290 * the caller to the existing WINS server on a Windows NT platform.
299 wins = inet_addr(*argv);
301 if ((hp = gethostbyname(*argv)) == NULL) {
302 option_error("invalid address parameter '%s' for ms-wins option",
306 wins = *(u_int32_t *)hp->h_addr;
309 /* if there is no primary then update it. */
310 if (ipcp_allowoptions[0].winsaddr[0] == 0)
311 ipcp_allowoptions[0].winsaddr[0] = wins;
313 /* always set the secondary address value to the same value. */
314 ipcp_allowoptions[0].winsaddr[1] = wins;
321 * ipcp_init - Initialize IPCP.
327 fsm *f = &ipcp_fsm[unit];
328 ipcp_options *wo = &ipcp_wantoptions[unit];
329 ipcp_options *ao = &ipcp_allowoptions[unit];
332 f->protocol = PPP_IPCP;
333 f->callbacks = &ipcp_callbacks;
334 fsm_init(&ipcp_fsm[unit]);
336 memset(wo, 0, sizeof(*wo));
337 memset(ao, 0, sizeof(*ao));
341 wo->vj_protocol = IPCP_VJ_COMP;
342 wo->maxslotindex = MAX_STATES - 1; /* really max index */
346 /* max slots and slot-id compression are currently hardwired in */
347 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
352 ao->maxslotindex = MAX_STATES - 1;
356 * XXX These control whether the user may use the proxyarp
357 * and defaultroute options.
360 ao->default_route = 1;
365 * ipcp_open - IPCP is allowed to come up.
371 fsm_open(&ipcp_fsm[unit]);
376 * ipcp_close - Take IPCP down.
379 ipcp_close(unit, reason)
383 fsm_close(&ipcp_fsm[unit], reason);
388 * ipcp_lowerup - The lower layer is up.
394 fsm_lowerup(&ipcp_fsm[unit]);
399 * ipcp_lowerdown - The lower layer is down.
405 fsm_lowerdown(&ipcp_fsm[unit]);
410 * ipcp_input - Input IPCP packet.
413 ipcp_input(unit, p, len)
418 fsm_input(&ipcp_fsm[unit], p, len);
423 * ipcp_protrej - A Protocol-Reject was received for IPCP.
425 * Pretend the lower layer went down, so we shut up.
431 fsm_lowerdown(&ipcp_fsm[unit]);
436 * ipcp_resetci - Reset our CI.
437 * Called by fsm_sconfreq, Send Configure Request.
443 ipcp_options *wo = &ipcp_wantoptions[f->unit];
445 wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
446 if (wo->ouraddr == 0)
447 wo->accept_local = 1;
448 if (wo->hisaddr == 0)
449 wo->accept_remote = 1;
450 wo->req_dns1 = usepeerdns; /* Request DNS addresses from the peer */
451 wo->req_dns2 = usepeerdns;
452 ipcp_gotoptions[f->unit] = *wo;
453 cis_received[f->unit] = 0;
458 * ipcp_cilen - Return length of our CI.
459 * Called by fsm_sconfreq, Send Configure Request.
465 ipcp_options *go = &ipcp_gotoptions[f->unit];
466 ipcp_options *wo = &ipcp_wantoptions[f->unit];
467 ipcp_options *ho = &ipcp_hisoptions[f->unit];
469 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
470 #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
471 #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
474 * First see if we want to change our options to the old
475 * forms because we have received old forms from the peer.
477 if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
478 /* use the old style of address negotiation */
482 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
483 /* try an older style of VJ negotiation */
484 if (cis_received[f->unit] == 0) {
485 /* keep trying the new style until we see some CI from the peer */
488 /* use the old style only if the peer did */
489 if (ho->neg_vj && ho->old_vj) {
492 go->vj_protocol = ho->vj_protocol;
497 return (LENCIADDR(go->neg_addr, go->old_addrs) +
498 LENCIVJ(go->neg_vj, go->old_vj) +
499 LENCIDNS(go->req_dns1) +
500 LENCIDNS(go->req_dns2)) ;
505 * ipcp_addci - Add our desired CIs to a packet.
506 * Called by fsm_sconfreq, Send Configure Request.
509 ipcp_addci(f, ucp, lenp)
514 ipcp_options *go = &ipcp_gotoptions[f->unit];
517 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
519 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
520 if (len >= vjlen) { \
522 PUTCHAR(vjlen, ucp); \
523 PUTSHORT(val, ucp); \
525 PUTCHAR(maxslotindex, ucp); \
526 PUTCHAR(cflag, ucp); \
533 #define ADDCIADDR(opt, neg, old, val1, val2) \
535 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
536 if (len >= addrlen) { \
539 PUTCHAR(addrlen, ucp); \
551 #define ADDCIDNS(opt, neg, addr) \
553 if (len >= CILEN_ADDR) { \
556 PUTCHAR(CILEN_ADDR, ucp); \
564 ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
565 go->old_addrs, go->ouraddr, go->hisaddr);
567 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
568 go->maxslotindex, go->cflag);
570 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
572 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
579 * ipcp_ackci - Ack our CIs.
580 * Called by fsm_rconfack, Receive Configure ACK.
587 ipcp_ackci(f, p, len)
592 ipcp_options *go = &ipcp_gotoptions[f->unit];
593 u_short cilen, citype, cishort;
595 u_char cimaxslotindex, cicflag;
598 * CIs must be in exactly the same order that we sent...
599 * Check packet length and CI length at each step.
600 * If we find any deviations, then this packet is bad.
603 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
605 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
606 if ((len -= vjlen) < 0) \
608 GETCHAR(citype, p); \
610 if (cilen != vjlen || \
613 GETSHORT(cishort, p); \
614 if (cishort != val) \
617 GETCHAR(cimaxslotindex, p); \
618 if (cimaxslotindex != maxslotindex) \
620 GETCHAR(cicflag, p); \
621 if (cicflag != cflag) \
626 #define ACKCIADDR(opt, neg, old, val1, val2) \
628 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
630 if ((len -= addrlen) < 0) \
632 GETCHAR(citype, p); \
634 if (cilen != addrlen || \
639 if (val1 != cilong) \
644 if (val2 != cilong) \
649 #define ACKCIDNS(opt, neg, addr) \
652 if ((len -= CILEN_ADDR) < 0) \
654 GETCHAR(citype, p); \
656 if (cilen != CILEN_ADDR || citype != opt) \
660 if (addr != cilong) \
664 ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
665 go->old_addrs, go->ouraddr, go->hisaddr);
667 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
668 go->maxslotindex, go->cflag);
670 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
672 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
675 * If there are any remaining CIs, then this packet is bad.
682 IPCPDEBUG(("ipcp_ackci: received bad Ack!"));
687 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
688 * This should not modify any state if the Nak is bad
689 * or if IPCP is in the OPENED state.
690 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
697 ipcp_nakci(f, p, len)
702 ipcp_options *go = &ipcp_gotoptions[f->unit];
703 u_char cimaxslotindex, cicflag;
704 u_char citype, cilen, *next;
706 u_int32_t ciaddr1, ciaddr2, l, cidnsaddr;
707 ipcp_options no; /* options we've seen Naks for */
708 ipcp_options try; /* options to request next time */
710 BZERO(&no, sizeof(no));
714 * Any Nak'd CIs must be in exactly the same order that we sent.
715 * Check packet length and CI length at each step.
716 * If we find any deviations, then this packet is bad.
718 #define NAKCIADDR(opt, neg, old, code) \
720 len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
726 ciaddr1 = htonl(l); \
729 ciaddr2 = htonl(l); \
737 #define NAKCIVJ(opt, neg, code) \
739 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
744 GETSHORT(cishort, p); \
749 #define NAKCIDNS(opt, neg, code) \
751 ((cilen = p[1]) == CILEN_ADDR) && \
757 cidnsaddr = htonl(l); \
763 * Accept the peer's idea of {our,his} address, if different
764 * from our idea, only if the accept_{local,remote} flag is set.
766 NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
767 if (go->accept_local && ciaddr1) { /* Do we know our address? */
768 try.ouraddr = ciaddr1;
770 if (go->accept_remote && ciaddr2) { /* Does he know his? */
771 try.hisaddr = ciaddr2;
776 * Accept the peer's value of maxslotindex provided that it
777 * is less than what we asked for. Turn off slot-ID compression
778 * if the peer wants. Send old-style compress-type option if
781 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
782 if (cilen == CILEN_VJ) {
783 GETCHAR(cimaxslotindex, p);
785 if (cishort == IPCP_VJ_COMP) {
787 if (cimaxslotindex < go->maxslotindex)
788 try.maxslotindex = cimaxslotindex;
795 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
797 try.vj_protocol = cishort;
804 NAKCIDNS(CI_MS_DNS1, req_dns1,
805 try.dnsaddr[0] = cidnsaddr;
808 NAKCIDNS(CI_MS_DNS2, req_dns2,
809 try.dnsaddr[1] = cidnsaddr;
813 * There may be remaining CIs, if the peer is requesting negotiation
814 * on an option that we didn't include in our request packet.
815 * If they want to negotiate about IP addresses, we comply.
816 * If they want us to ask for compression, we refuse.
818 while (len > CILEN_VOID) {
821 if( (len -= cilen) < 0 )
823 next = p + cilen - 2;
826 case CI_COMPRESSTYPE:
827 if (go->neg_vj || no.neg_vj ||
828 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
833 if ((go->neg_addr && go->old_addrs) || no.old_addrs
834 || cilen != CILEN_ADDRS)
840 if (ciaddr1 && go->accept_local)
841 try.ouraddr = ciaddr1;
844 if (ciaddr2 && go->accept_remote)
845 try.hisaddr = ciaddr2;
849 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
854 if (ciaddr1 && go->accept_local)
855 try.ouraddr = ciaddr1;
856 if (try.ouraddr != 0)
865 * OK, the Nak is good. Now we can update state.
866 * If there are any remaining options, we ignore them.
868 if (f->state != OPENED)
874 IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
880 * ipcp_rejci - Reject some of our CIs.
881 * Callback from fsm_rconfnakrej.
884 ipcp_rejci(f, p, len)
889 ipcp_options *go = &ipcp_gotoptions[f->unit];
890 u_char cimaxslotindex, ciflag, cilen;
893 ipcp_options try; /* options to request next time */
897 * Any Rejected CIs must be in exactly the same order that we sent.
898 * Check packet length and CI length at each step.
899 * If we find any deviations, then this packet is bad.
901 #define REJCIADDR(opt, neg, old, val1, val2) \
903 len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
911 /* Check rejected value. */ \
912 if (cilong != val1) \
917 /* Check rejected value. */ \
918 if (cilong != val2) \
924 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
926 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
931 GETSHORT(cishort, p); \
932 /* Check rejected value. */ \
933 if (cishort != val) \
936 GETCHAR(cimaxslotindex, p); \
937 if (cimaxslotindex != maxslot) \
939 GETCHAR(ciflag, p); \
940 if (ciflag != cflag) \
946 #define REJCIDNS(opt, neg, dnsaddr) \
948 ((cilen = p[1]) == CILEN_ADDR) && \
956 /* Check rejected value. */ \
957 if (cilong != dnsaddr) \
963 REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
964 go->old_addrs, go->ouraddr, go->hisaddr);
966 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
967 go->maxslotindex, go->cflag);
969 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
971 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
974 * If there are any remaining CIs, then this packet is bad.
979 * Now we can update state.
981 if (f->state != OPENED)
986 IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
992 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
993 * Callback from fsm_rconfreq, Receive Configure Request
995 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
996 * appropriately. If reject_if_disagree is non-zero, doesn't return
997 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1000 ipcp_reqci(f, inp, len, reject_if_disagree)
1002 u_char *inp; /* Requested CIs */
1003 int *len; /* Length of requested CIs */
1004 int reject_if_disagree;
1006 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1007 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1008 ipcp_options *ao = &ipcp_allowoptions[f->unit];
1009 ipcp_options *go = &ipcp_gotoptions[f->unit];
1010 u_char *cip, *next; /* Pointer to current and next CIs */
1011 u_short cilen, citype; /* Parsed len, type */
1012 u_short cishort; /* Parsed short value */
1013 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
1014 int rc = CONFACK; /* Final packet return code */
1015 int orc; /* Individual option return code */
1016 u_char *p; /* Pointer to next char to parse */
1017 u_char *ucp = inp; /* Pointer to current output char */
1018 int l = *len; /* Length left */
1019 u_char maxslotindex, cflag;
1022 cis_received[f->unit] = 1;
1025 * Reset all his options.
1027 BZERO(ho, sizeof(*ho));
1030 * Process all his options.
1034 orc = CONFACK; /* Assume success */
1035 cip = p = next; /* Remember begining of CI */
1036 if (l < 2 || /* Not enough data for CI header or */
1037 p[1] < 2 || /* CI length too small or */
1038 p[1] > l) { /* CI length too big? */
1039 IPCPDEBUG(("ipcp_reqci: bad CI length!"));
1040 orc = CONFREJ; /* Reject bad CI */
1041 cilen = l; /* Reject till end of packet */
1042 l = 0; /* Don't loop again */
1045 GETCHAR(citype, p); /* Parse CI type */
1046 GETCHAR(cilen, p); /* Parse CI length */
1047 l -= cilen; /* Adjust remaining length */
1048 next += cilen; /* Step to next CI */
1050 switch (citype) { /* Check CI type */
1052 if (!ao->neg_addr ||
1053 cilen != CILEN_ADDRS) { /* Check CI length */
1054 orc = CONFREJ; /* Reject CI */
1059 * If he has no address, or if we both have his address but
1060 * disagree about it, then NAK it with our idea.
1061 * In particular, if we don't know his address, but he does,
1064 GETLONG(tl, p); /* Parse source address (his) */
1065 ciaddr1 = htonl(tl);
1066 if (ciaddr1 != wo->hisaddr
1067 && (ciaddr1 == 0 || !wo->accept_remote)) {
1069 if (!reject_if_disagree) {
1070 DECPTR(sizeof(u_int32_t), p);
1071 tl = ntohl(wo->hisaddr);
1074 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1076 * If neither we nor he knows his address, reject the option.
1079 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1084 * If he doesn't know our address, or if we both have our address
1085 * but disagree about it, then NAK it with our idea.
1087 GETLONG(tl, p); /* Parse desination address (ours) */
1088 ciaddr2 = htonl(tl);
1089 if (ciaddr2 != wo->ouraddr) {
1090 if (ciaddr2 == 0 || !wo->accept_local) {
1092 if (!reject_if_disagree) {
1093 DECPTR(sizeof(u_int32_t), p);
1094 tl = ntohl(wo->ouraddr);
1098 go->ouraddr = ciaddr2; /* accept peer's idea */
1104 ho->hisaddr = ciaddr1;
1105 ho->ouraddr = ciaddr2;
1109 if (!ao->neg_addr ||
1110 cilen != CILEN_ADDR) { /* Check CI length */
1111 orc = CONFREJ; /* Reject CI */
1116 * If he has no address, or if we both have his address but
1117 * disagree about it, then NAK it with our idea.
1118 * In particular, if we don't know his address, but he does,
1121 GETLONG(tl, p); /* Parse source address (his) */
1122 ciaddr1 = htonl(tl);
1123 if (ciaddr1 != wo->hisaddr
1124 && (ciaddr1 == 0 || !wo->accept_remote)) {
1126 if (!reject_if_disagree) {
1127 DECPTR(sizeof(u_int32_t), p);
1128 tl = ntohl(wo->hisaddr);
1131 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1133 * Don't ACK an address of 0.0.0.0 - reject it instead.
1136 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1141 ho->hisaddr = ciaddr1;
1146 /* Microsoft primary or secondary DNS request */
1147 d = citype == CI_MS_DNS2;
1149 /* If we do not have a DNS address then we cannot send it */
1150 if (ao->dnsaddr[d] == 0 ||
1151 cilen != CILEN_ADDR) { /* Check CI length */
1152 orc = CONFREJ; /* Reject CI */
1156 if (htonl(tl) != ao->dnsaddr[d]) {
1157 DECPTR(sizeof(u_int32_t), p);
1158 tl = ntohl(ao->dnsaddr[d]);
1166 /* Microsoft primary or secondary WINS request */
1167 d = citype == CI_MS_WINS2;
1169 /* If we do not have a DNS address then we cannot send it */
1170 if (ao->winsaddr[d] == 0 ||
1171 cilen != CILEN_ADDR) { /* Check CI length */
1172 orc = CONFREJ; /* Reject CI */
1176 if (htonl(tl) != ao->winsaddr[d]) {
1177 DECPTR(sizeof(u_int32_t), p);
1178 tl = ntohl(ao->winsaddr[d]);
1184 case CI_COMPRESSTYPE:
1186 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
1190 GETSHORT(cishort, p);
1192 if (!(cishort == IPCP_VJ_COMP ||
1193 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1199 ho->vj_protocol = cishort;
1200 if (cilen == CILEN_VJ) {
1201 GETCHAR(maxslotindex, p);
1202 if (maxslotindex > ao->maxslotindex) {
1204 if (!reject_if_disagree){
1206 PUTCHAR(ao->maxslotindex, p);
1210 if (cflag && !ao->cflag) {
1212 if (!reject_if_disagree){
1214 PUTCHAR(wo->cflag, p);
1217 ho->maxslotindex = maxslotindex;
1221 ho->maxslotindex = MAX_STATES - 1;
1231 if (orc == CONFACK && /* Good CI */
1232 rc != CONFACK) /* but prior CI wasnt? */
1233 continue; /* Don't send this one */
1235 if (orc == CONFNAK) { /* Nak this CI? */
1236 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1237 orc = CONFREJ; /* Get tough if so */
1239 if (rc == CONFREJ) /* Rejecting prior CI? */
1240 continue; /* Don't send this one */
1241 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1242 rc = CONFNAK; /* Not anymore... */
1243 ucp = inp; /* Backup */
1248 if (orc == CONFREJ && /* Reject this CI */
1249 rc != CONFREJ) { /* but no prior ones? */
1251 ucp = inp; /* Backup */
1254 /* Need to move CI? */
1256 BCOPY(cip, ucp, cilen); /* Move it */
1258 /* Update output pointer */
1263 * If we aren't rejecting this packet, and we want to negotiate
1264 * their address, and they didn't send their address, then we
1265 * send a NAK with a CI_ADDR option appended. We assume the
1266 * input buffer is long enough that we can append the extra
1269 if (rc != CONFREJ && !ho->neg_addr &&
1270 wo->req_addr && !reject_if_disagree) {
1271 if (rc == CONFACK) {
1273 ucp = inp; /* reset pointer */
1274 wo->req_addr = 0; /* don't ask again */
1276 PUTCHAR(CI_ADDR, ucp);
1277 PUTCHAR(CILEN_ADDR, ucp);
1278 tl = ntohl(wo->hisaddr);
1282 *len = ucp - inp; /* Compute output length */
1283 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
1284 return (rc); /* Return final code */
1289 * ip_check_options - check that any IP-related options are OK,
1290 * and assign appropriate defaults.
1297 ipcp_options *wo = &ipcp_wantoptions[0];
1300 * Default our local IP address based on our hostname.
1301 * If local IP address already given, don't bother.
1303 if (wo->ouraddr == 0 && !disable_defaultip) {
1305 * Look up our hostname (possibly with domain name appended)
1306 * and take the first IP address as our local IP address.
1307 * If there isn't an IP address for our hostname, too bad.
1309 wo->accept_local = 1; /* don't insist on this default value */
1310 if ((hp = gethostbyname(hostname)) != NULL) {
1311 local = *(u_int32_t *)hp->h_addr;
1312 if (local != 0 && !bad_ip_adrs(local))
1313 wo->ouraddr = local;
1317 if (demand && wo->hisaddr == 0) {
1318 option_error("remote IP address required for demand-dialling\n");
1322 if (demand && wo->accept_remote) {
1323 option_error("ipcp-accept-remote is incompatible with demand\n");
1331 * ip_demand_conf - configure the interface as though
1332 * IPCP were up, for use with dial-on-demand.
1338 ipcp_options *wo = &ipcp_wantoptions[u];
1340 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1344 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1346 if (wo->default_route)
1347 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1348 default_route_set[u] = 1;
1350 if (sifproxyarp(u, wo->hisaddr))
1351 proxy_arp_set[u] = 1;
1353 notice("local IP address %I", wo->ouraddr);
1354 notice("remote IP address %I", wo->hisaddr);
1361 * ipcp_up - IPCP has come UP.
1363 * Configure the IP network interface appropriately and bring it up.
1370 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1371 ipcp_options *go = &ipcp_gotoptions[f->unit];
1372 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1374 IPCPDEBUG(("ipcp: up"));
1377 * We must have a non-zero IP address for both ends of the link.
1380 ho->hisaddr = wo->hisaddr;
1382 if (ho->hisaddr == 0) {
1383 error("Could not determine remote IP address");
1384 ipcp_close(f->unit, "Could not determine remote IP address");
1387 if (go->ouraddr == 0) {
1388 error("Could not determine local IP address");
1389 ipcp_close(f->unit, "Could not determine local IP address");
1392 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr));
1393 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr));
1395 if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1396 script_setenv("USEPEERDNS", "1");
1398 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]));
1400 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]));
1401 create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
1405 * Check that the peer is allowed to use the IP address it wants.
1407 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1408 error("Peer is not authorized to use remote address %I", ho->hisaddr);
1409 ipcp_close(f->unit, "Unauthorized remote IP address");
1413 /* set tcp compression */
1414 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1417 * If we are doing dial-on-demand, the interface is already
1418 * configured, so we put out any saved-up packets, then set the
1419 * interface to pass IP packets.
1422 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1423 if (go->ouraddr != wo->ouraddr) {
1424 warn("Local IP address changed to %I", go->ouraddr);
1425 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr));
1426 wo->ouraddr = go->ouraddr;
1428 script_unsetenv("OLDIPLOCAL");
1429 if (ho->hisaddr != wo->hisaddr) {
1430 warn("Remote IP address changed to %I", ho->hisaddr);
1431 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr));
1432 wo->hisaddr = ho->hisaddr;
1434 script_unsetenv("OLDIPREMOTE");
1435 ipcp_clear_addrs(f->unit);
1437 /* Set the interface to the new addresses */
1438 mask = GetMask(go->ouraddr);
1439 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1441 warn("Interface configuration failed");
1442 ipcp_close(f->unit, "Interface configuration failed");
1446 /* assign a default route through the interface if required */
1447 if (ipcp_wantoptions[f->unit].default_route)
1448 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1449 default_route_set[f->unit] = 1;
1451 /* Make a proxy ARP entry if requested. */
1452 if (ipcp_wantoptions[f->unit].proxy_arp)
1453 if (sifproxyarp(f->unit, ho->hisaddr))
1454 proxy_arp_set[f->unit] = 1;
1457 demand_rexmit(PPP_IP);
1458 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1462 * Set IP addresses and (if specified) netmask.
1464 mask = GetMask(go->ouraddr);
1466 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1467 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1469 warn("Interface configuration failed");
1470 ipcp_close(f->unit, "Interface configuration failed");
1475 /* bring the interface up for IP */
1476 if (!sifup(f->unit)) {
1478 warn("Interface failed to come up");
1479 ipcp_close(f->unit, "Interface configuration failed");
1483 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1484 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1486 warn("Interface configuration failed");
1487 ipcp_close(f->unit, "Interface configuration failed");
1491 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1493 /* assign a default route through the interface if required */
1494 if (ipcp_wantoptions[f->unit].default_route)
1495 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1496 default_route_set[f->unit] = 1;
1498 /* Make a proxy ARP entry if requested. */
1499 if (ipcp_wantoptions[f->unit].proxy_arp)
1500 if (sifproxyarp(f->unit, ho->hisaddr))
1501 proxy_arp_set[f->unit] = 1;
1503 notice("local IP address %I", go->ouraddr);
1504 notice("remote IP address %I", ho->hisaddr);
1506 notice("primary DNS address %I", go->dnsaddr[0]);
1508 notice("secondary DNS address %I", go->dnsaddr[1]);
1511 np_up(f->unit, PPP_IP);
1515 * Execute the ip-up script, like this:
1516 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1518 if (ipcp_script_state == s_down && ipcp_script_pid == 0) {
1519 ipcp_script_state = s_up;
1520 ipcp_script(_PATH_IPUP);
1526 * ipcp_down - IPCP has gone DOWN.
1528 * Take the IP network interface down, clear its addresses
1529 * and delete routes through it.
1535 IPCPDEBUG(("ipcp: down"));
1536 if (get_ppp_stats(f->unit, &link_stats))
1537 link_stats_valid = 1;
1540 np_down(f->unit, PPP_IP);
1542 sifvjcomp(f->unit, 0, 0, 0);
1545 * If we are doing dial-on-demand, set the interface
1546 * to queue up outgoing packets (for now).
1549 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1552 ipcp_clear_addrs(f->unit);
1555 /* Execute the ip-down script */
1556 if (ipcp_script_state == s_up && ipcp_script_pid == 0) {
1557 ipcp_script_state = s_down;
1558 ipcp_script(_PATH_IPDOWN);
1564 * ipcp_clear_addrs() - clear the interface addresses, routes,
1565 * proxy arp entries, etc.
1568 ipcp_clear_addrs(unit)
1571 u_int32_t ouraddr, hisaddr;
1573 ouraddr = ipcp_gotoptions[unit].ouraddr;
1574 hisaddr = ipcp_hisoptions[unit].hisaddr;
1575 if (proxy_arp_set[unit]) {
1576 cifproxyarp(unit, hisaddr);
1577 proxy_arp_set[unit] = 0;
1579 if (default_route_set[unit]) {
1580 cifdefaultroute(unit, ouraddr, hisaddr);
1581 default_route_set[unit] = 0;
1583 cifaddr(unit, ouraddr, hisaddr);
1588 * ipcp_finished - possibly shut down the lower layers.
1594 np_finished(f->unit, PPP_IP);
1599 * ipcp_script_done - called when the ip-up or ip-down script
1603 ipcp_script_done(arg)
1606 ipcp_script_pid = 0;
1607 switch (ipcp_script_state) {
1609 if (ipcp_fsm[0].state != OPENED) {
1610 ipcp_script_state = s_down;
1611 ipcp_script(_PATH_IPDOWN);
1615 if (ipcp_fsm[0].state == OPENED) {
1616 ipcp_script_state = s_up;
1617 ipcp_script(_PATH_IPUP);
1625 * ipcp_script - Execute a script with arguments
1626 * interface-name tty-name speed local-IP remote-IP.
1632 char strspeed[32], strlocal[32], strremote[32];
1635 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
1636 slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr);
1637 slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr);
1644 argv[5] = strremote;
1647 ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, NULL);
1651 * create_resolv - create the replacement resolv.conf file
1654 create_resolv(peerdns1, peerdns2)
1655 u_int32_t peerdns1, peerdns2;
1659 f = fopen(_PATH_RESOLV, "w");
1661 error("Failed to create %s: %m", _PATH_RESOLV);
1666 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1));
1669 fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2));
1672 error("Write failed to %s: %m", _PATH_RESOLV);
1678 * ipcp_printpkt - print the contents of an IPCP packet.
1680 static char *ipcp_codenames[] = {
1681 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1682 "TermReq", "TermAck", "CodeRej"
1686 ipcp_printpkt(p, plen, printer, arg)
1689 void (*printer) __P((void *, char *, ...));
1692 int code, id, len, olen;
1693 u_char *pstart, *optend;
1697 if (plen < HEADERLEN)
1703 if (len < HEADERLEN || len > plen)
1706 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
1707 printer(arg, " %s", ipcp_codenames[code-1]);
1709 printer(arg, " code=0x%x", code);
1710 printer(arg, " id=0x%x", id);
1717 /* print option list */
1722 if (olen < 2 || olen > len) {
1730 if (olen == CILEN_ADDRS) {
1733 printer(arg, "addrs %I", htonl(cilong));
1735 printer(arg, " %I", htonl(cilong));
1738 case CI_COMPRESSTYPE:
1739 if (olen >= CILEN_COMPRESS) {
1741 GETSHORT(cishort, p);
1742 printer(arg, "compress ");
1747 case IPCP_VJ_COMP_OLD:
1748 printer(arg, "old-VJ");
1751 printer(arg, "0x%x", cishort);
1756 if (olen == CILEN_ADDR) {
1759 printer(arg, "addr %I", htonl(cilong));
1766 printer(arg, "ms-dns %I", htonl(cilong));
1772 printer(arg, "ms-wins %I", htonl(cilong));
1775 while (p < optend) {
1777 printer(arg, " %.2x", code);
1785 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1787 print_string(p, len, printer, arg);
1794 /* print the rest of the bytes in the packet */
1795 for (; len > 0; --len) {
1797 printer(arg, " %.2x", code);
1804 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
1805 * We don't bring the link up for IP fragments or for TCP FIN packets
1808 #define IP_HDRLEN 20 /* bytes */
1809 #define IP_OFFMASK 0x1fff
1810 #define IPPROTO_TCP 6
1811 #define TCP_HDRLEN 20
1815 * We use these macros because the IP header may be at an odd address,
1816 * and some compilers might use word loads to get th_off or ip_hl.
1819 #define net_short(x) (((x)[0] << 8) + (x)[1])
1820 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
1821 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
1822 #define get_ipproto(x) (((unsigned char *)(x))[9])
1823 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1824 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1827 ip_active_pkt(pkt, len)
1836 if (len < IP_HDRLEN)
1838 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
1840 if (get_ipproto(pkt) != IPPROTO_TCP)
1842 hlen = get_iphl(pkt) * 4;
1843 if (len < hlen + TCP_HDRLEN)
1846 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)