diff options
Diffstat (limited to 'cpukit/pppd/ipcp.c')
| -rw-r--r-- | cpukit/pppd/ipcp.c | 1506 |
1 files changed, 1506 insertions, 0 deletions
diff --git a/cpukit/pppd/ipcp.c b/cpukit/pppd/ipcp.c new file mode 100644 index 0000000000..5553d3194d --- /dev/null +++ b/cpukit/pppd/ipcp.c @@ -0,0 +1,1506 @@ +/* + * ipcp.c - PPP IP Control Protocol. + * + * Copyright (c) 1989 Carnegie Mellon University. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by Carnegie Mellon University. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#ifndef lint +/* static char rcsid[] = "$Id$"; */ +#endif + +/* + * TODO: + */ + +#include <stdio.h> +#include <string.h> +#include <syslog.h> +#include <netdb.h> +#include <sys/param.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +/* #include <stbconfig.h> */ + +#include "pppd.h" +#include "fsm.h" +#include "ipcp.h" +#include "pathnames.h" + +/* global vars */ +ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */ +ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ +ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ +ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ + +/* local vars */ +static int cis_received[NUM_PPP]; /* # Conf-Reqs received */ +static int default_route_set[NUM_PPP]; /* Have set up a default route */ +static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */ + +/* + * Callbacks for fsm code. (CI = Configuration Information) + */ +static void ipcp_resetci __P((fsm *)); /* Reset our CI */ +static int ipcp_cilen __P((fsm *)); /* Return length of our CI */ +static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ +static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ +static int ipcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ +static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ +static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ +static void ipcp_up __P((fsm *)); /* We're UP */ +static void ipcp_down __P((fsm *)); /* We're DOWN */ +#if 0 +static void ipcp_script __P((fsm *, char *)); /* Run an up/down script */ +#endif +static void ipcp_finished __P((fsm *)); /* Don't need lower layer */ + +fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */ + +static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */ + ipcp_resetci, /* Reset our Configuration Information */ + ipcp_cilen, /* Length of our Configuration Information */ + ipcp_addci, /* Add our Configuration Information */ + ipcp_ackci, /* ACK our Configuration Information */ + ipcp_nakci, /* NAK our Configuration Information */ + ipcp_rejci, /* Reject our Configuration Information */ + ipcp_reqci, /* Request peer's Configuration Information */ + ipcp_up, /* Called when fsm reaches OPENED state */ + ipcp_down, /* Called when fsm leaves OPENED state */ + NULL, /* Called when we want the lower layer up */ + ipcp_finished, /* Called when we want the lower layer down */ + NULL, /* Called when Protocol-Reject received */ + NULL, /* Retransmission is necessary */ + NULL, /* Called to handle protocol-specific codes */ + "IPCP" /* String name of protocol */ +}; + +/* + * Protocol entry points from main code. + */ +static void ipcp_init __P((int)); +static void ipcp_open __P((int)); +static void ipcp_close __P((int, char *)); +static void ipcp_lowerup __P((int)); +static void ipcp_lowerdown __P((int)); +static void ipcp_input __P((int, u_char *, int)); +static void ipcp_protrej __P((int)); +static int ipcp_printpkt __P((u_char *, int, + void (*) __P((void *, char *, ...)), void *)); +static void ip_check_options __P((void)); +static int ip_demand_conf __P((int)); +static int ip_active_pkt __P((u_char *, int)); + +struct protent ipcp_protent = { + PPP_IPCP, + ipcp_init, + ipcp_input, + ipcp_protrej, + ipcp_lowerup, + ipcp_lowerdown, + ipcp_open, + ipcp_close, + ipcp_printpkt, + NULL, + 1, + "IPCP", + ip_check_options, + ip_demand_conf, + ip_active_pkt +}; + +static void ipcp_clear_addrs __P((int)); + +/* + * Lengths of configuration options. + */ +#define CILEN_VOID 2 +#define CILEN_COMPRESS 4 /* min length for compression protocol opt. */ +#define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */ +#define CILEN_ADDR 6 /* new-style single address option */ +#define CILEN_ADDRS 10 /* old-style dual address option */ + + +#define CODENAME(x) ((x) == CONFACK ? "ACK" : \ + (x) == CONFNAK ? "NAK" : "REJ") + + +/* + * Make a string representation of a network IP address. + */ +char * +ip_ntoa(ipaddr) +u_int32_t ipaddr; +{ + static char b[64]; + + ipaddr = ntohl(ipaddr); + + sprintf(b, "%d.%d.%d.%d", + (u_char)(ipaddr >> 24), + (u_char)(ipaddr >> 16), + (u_char)(ipaddr >> 8), + (u_char)(ipaddr)); + return b; +} + + +/* + * ipcp_init - Initialize IPCP. + */ +static void +ipcp_init(unit) + int unit; +{ + fsm *f = &ipcp_fsm[unit]; + ipcp_options *wo = &ipcp_wantoptions[unit]; + ipcp_options *ao = &ipcp_allowoptions[unit]; + + f->unit = unit; + f->protocol = PPP_IPCP; + f->callbacks = &ipcp_callbacks; + fsm_init(&ipcp_fsm[unit]); + + memset(wo, 0, sizeof(*wo)); + memset(ao, 0, sizeof(*ao)); + + wo->neg_addr = 1; + wo->neg_vj = 1; + wo->vj_protocol = IPCP_VJ_COMP; + wo->maxslotindex = MAX_STATES - 1; /* really max index */ + wo->cflag = 1; + ipcp_wantoptions[0].default_route = 1; + /* max slots and slot-id compression are currently hardwired in */ + /* ppp_if.c to 16 and 1, this needs to be changed (among other */ + /* things) gmc */ + + ao->neg_addr = 1; + ao->neg_vj = 1; + ao->maxslotindex = MAX_STATES - 1; + ao->cflag = 1; + + /* + * XXX These control whether the user may use the proxyarp + * and defaultroute options. + */ + ao->proxy_arp = 1; + ao->default_route = 1; +} + + +/* + * ipcp_open - IPCP is allowed to come up. + */ +static void +ipcp_open(unit) + int unit; +{ + fsm_open(&ipcp_fsm[unit]); +} + + +/* + * ipcp_close - Take IPCP down. + */ +static void +ipcp_close(unit, reason) + int unit; + char *reason; +{ + fsm_close(&ipcp_fsm[unit], reason); +} + + +/* + * ipcp_lowerup - The lower layer is up. + */ +static void +ipcp_lowerup(unit) + int unit; +{ + fsm_lowerup(&ipcp_fsm[unit]); +} + + +/* + * ipcp_lowerdown - The lower layer is down. + */ +static void +ipcp_lowerdown(unit) + int unit; +{ + fsm_lowerdown(&ipcp_fsm[unit]); +} + + +/* + * ipcp_input - Input IPCP packet. + */ +static void +ipcp_input(unit, p, len) + int unit; + u_char *p; + int len; +{ + fsm_input(&ipcp_fsm[unit], p, len); +} + + +/* + * ipcp_protrej - A Protocol-Reject was received for IPCP. + * + * Pretend the lower layer went down, so we shut up. + */ +static void +ipcp_protrej(unit) + int unit; +{ + fsm_lowerdown(&ipcp_fsm[unit]); +} + + +/* + * ipcp_resetci - Reset our CI. + */ +static void +ipcp_resetci(f) + fsm *f; +{ + ipcp_options *wo = &ipcp_wantoptions[f->unit]; + + wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr; + if (wo->ouraddr == 0) + wo->accept_local = 1; + if (wo->hisaddr == 0) + wo->accept_remote = 1; + ipcp_gotoptions[f->unit] = *wo; + cis_received[f->unit] = 0; +} + + +/* + * ipcp_cilen - Return length of our CI. + */ +static int +ipcp_cilen(f) + fsm *f; +{ + ipcp_options *go = &ipcp_gotoptions[f->unit]; + ipcp_options *wo = &ipcp_wantoptions[f->unit]; + ipcp_options *ho = &ipcp_hisoptions[f->unit]; + +#define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0) +#define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0) + + /* + * First see if we want to change our options to the old + * forms because we have received old forms from the peer. + */ + if (wo->neg_addr && !go->neg_addr && !go->old_addrs) { + /* use the old style of address negotiation */ + go->neg_addr = 1; + go->old_addrs = 1; + } + if (wo->neg_vj && !go->neg_vj && !go->old_vj) { + /* try an older style of VJ negotiation */ + if (cis_received[f->unit] == 0) { + /* keep trying the new style until we see some CI from the peer */ + go->neg_vj = 1; + } else { + /* use the old style only if the peer did */ + if (ho->neg_vj && ho->old_vj) { + go->neg_vj = 1; + go->old_vj = 1; + go->vj_protocol = ho->vj_protocol; + } + } + } + + return (LENCIADDR(go->neg_addr, go->old_addrs) + + LENCIVJ(go->neg_vj, go->old_vj)); +} + + +/* + * ipcp_addci - Add our desired CIs to a packet. + */ +static void +ipcp_addci(f, ucp, lenp) + fsm *f; + u_char *ucp; + int *lenp; +{ + ipcp_options *go = &ipcp_gotoptions[f->unit]; + int len = *lenp; + +#define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \ + if (neg) { \ + int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ + if (len >= vjlen) { \ + PUTCHAR(opt, ucp); \ + PUTCHAR(vjlen, ucp); \ + PUTSHORT(val, ucp); \ + if (!old) { \ + PUTCHAR(maxslotindex, ucp); \ + PUTCHAR(cflag, ucp); \ + } \ + len -= vjlen; \ + } else \ + neg = 0; \ + } + +#define ADDCIADDR(opt, neg, old, val1, val2) \ + if (neg) { \ + int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \ + if (len >= addrlen) { \ + u_int32_t l; \ + PUTCHAR(opt, ucp); \ + PUTCHAR(addrlen, ucp); \ + l = ntohl(val1); \ + PUTLONG(l, ucp); \ + if (old) { \ + l = ntohl(val2); \ + PUTLONG(l, ucp); \ + } \ + len -= addrlen; \ + } else \ + neg = 0; \ + } + + ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr, + go->old_addrs, go->ouraddr, go->hisaddr); + + ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, + go->maxslotindex, go->cflag); + + *lenp -= len; +} + + +/* + * ipcp_ackci - Ack our CIs. + * + * Returns: + * 0 - Ack was bad. + * 1 - Ack was good. + */ +static int +ipcp_ackci(f, p, len) + fsm *f; + u_char *p; + int len; +{ + ipcp_options *go = &ipcp_gotoptions[f->unit]; + u_short cilen, citype, cishort; + u_int32_t cilong; + u_char cimaxslotindex, cicflag; + + /* + * CIs must be in exactly the same order that we sent... + * Check packet length and CI length at each step. + * If we find any deviations, then this packet is bad. + */ + +#define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \ + if (neg) { \ + int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ + if ((len -= vjlen) < 0) \ + goto bad; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != vjlen || \ + citype != opt) \ + goto bad; \ + GETSHORT(cishort, p); \ + if (cishort != val) \ + goto bad; \ + if (!old) { \ + GETCHAR(cimaxslotindex, p); \ + if (cimaxslotindex != maxslotindex) \ + goto bad; \ + GETCHAR(cicflag, p); \ + if (cicflag != cflag) \ + goto bad; \ + } \ + } + +#define ACKCIADDR(opt, neg, old, val1, val2) \ + if (neg) { \ + int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \ + u_int32_t l; \ + if ((len -= addrlen) < 0) \ + goto bad; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != addrlen || \ + citype != opt) \ + goto bad; \ + GETLONG(l, p); \ + cilong = htonl(l); \ + if (val1 != cilong) \ + goto bad; \ + if (old) { \ + GETLONG(l, p); \ + cilong = htonl(l); \ + if (val2 != cilong) \ + goto bad; \ + } \ + } + + ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr, + go->old_addrs, go->ouraddr, go->hisaddr); + + ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, + go->maxslotindex, go->cflag); + + /* + * If there are any remaining CIs, then this packet is bad. + */ + if (len != 0) + goto bad; + return (1); + +bad: + IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!")); + return (0); +} + +/* + * ipcp_nakci - Peer has sent a NAK for some of our CIs. + * This should not modify any state if the Nak is bad + * or if IPCP is in the OPENED state. + * + * Returns: + * 0 - Nak was bad. + * 1 - Nak was good. + */ +static int +ipcp_nakci(f, p, len) + fsm *f; + u_char *p; + int len; +{ + ipcp_options *go = &ipcp_gotoptions[f->unit]; + u_char cimaxslotindex, cicflag; + u_char citype, cilen, *next; + u_short cishort; + u_int32_t ciaddr1, ciaddr2, l; + ipcp_options no; /* options we've seen Naks for */ + ipcp_options try; /* options to request next time */ + + BZERO(&no, sizeof(no)); + try = *go; + + /* + * Any Nak'd CIs must be in exactly the same order that we sent. + * Check packet length and CI length at each step. + * If we find any deviations, then this packet is bad. + */ +#define NAKCIADDR(opt, neg, old, code) \ + if (go->neg && \ + len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \ + p[1] == cilen && \ + p[0] == opt) { \ + len -= cilen; \ + INCPTR(2, p); \ + GETLONG(l, p); \ + ciaddr1 = htonl(l); \ + if (old) { \ + GETLONG(l, p); \ + ciaddr2 = htonl(l); \ + no.old_addrs = 1; \ + } else \ + ciaddr2 = 0; \ + no.neg = 1; \ + code \ + } + +#define NAKCIVJ(opt, neg, code) \ + if (go->neg && \ + ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \ + len >= cilen && \ + p[0] == opt) { \ + len -= cilen; \ + INCPTR(2, p); \ + GETSHORT(cishort, p); \ + no.neg = 1; \ + code \ + } + + /* + * Accept the peer's idea of {our,his} address, if different + * from our idea, only if the accept_{local,remote} flag is set. + */ + NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs, + if (go->accept_local && ciaddr1) { /* Do we know our address? */ + try.ouraddr = ciaddr1; + IPCPDEBUG((LOG_INFO, "local IP address %s", + ip_ntoa(ciaddr1))); + } + if (go->accept_remote && ciaddr2) { /* Does he know his? */ + try.hisaddr = ciaddr2; + IPCPDEBUG((LOG_INFO, "remote IP address %s", + ip_ntoa(ciaddr2))); + } + ); + + /* + * Accept the peer's value of maxslotindex provided that it + * is less than what we asked for. Turn off slot-ID compression + * if the peer wants. Send old-style compress-type option if + * the peer wants. + */ + NAKCIVJ(CI_COMPRESSTYPE, neg_vj, + if (cilen == CILEN_VJ) { + GETCHAR(cimaxslotindex, p); + GETCHAR(cicflag, p); + if (cishort == IPCP_VJ_COMP) { + try.old_vj = 0; + if (cimaxslotindex < go->maxslotindex) + try.maxslotindex = cimaxslotindex; + if (!cicflag) + try.cflag = 0; + } else { + try.neg_vj = 0; + } + } else { + if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) { + try.old_vj = 1; + try.vj_protocol = cishort; + } else { + try.neg_vj = 0; + } + } + ); + + /* + * There may be remaining CIs, if the peer is requesting negotiation + * on an option that we didn't include in our request packet. + * If they want to negotiate about IP addresses, we comply. + * If they want us to ask for compression, we refuse. + */ + while (len > CILEN_VOID) { + GETCHAR(citype, p); + GETCHAR(cilen, p); + if( (len -= cilen) < 0 ) + goto bad; + next = p + cilen - 2; + + switch (citype) { + case CI_COMPRESSTYPE: + if (go->neg_vj || no.neg_vj || + (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) + goto bad; + no.neg_vj = 1; + break; + case CI_ADDRS: + if ((go->neg_addr && go->old_addrs) || no.old_addrs + || cilen != CILEN_ADDRS) + goto bad; + try.neg_addr = 1; + try.old_addrs = 1; + GETLONG(l, p); + ciaddr1 = htonl(l); + if (ciaddr1 && go->accept_local) + try.ouraddr = ciaddr1; + GETLONG(l, p); + ciaddr2 = htonl(l); + if (ciaddr2 && go->accept_remote) + try.hisaddr = ciaddr2; + no.old_addrs = 1; + break; + case CI_ADDR: + if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) + goto bad; + try.old_addrs = 0; + GETLONG(l, p); + ciaddr1 = htonl(l); + if (ciaddr1 && go->accept_local) + try.ouraddr = ciaddr1; + if (try.ouraddr != 0) + try.neg_addr = 1; + no.neg_addr = 1; + break; + } + p = next; + } + + /* If there is still anything left, this packet is bad. */ + if (len != 0) + goto bad; + + /* + * OK, the Nak is good. Now we can update state. + */ + if (f->state != OPENED) + *go = try; + + return 1; + +bad: + IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!")); + return 0; +} + + +/* + * ipcp_rejci - Reject some of our CIs. + */ +static int +ipcp_rejci(f, p, len) + fsm *f; + u_char *p; + int len; +{ + ipcp_options *go = &ipcp_gotoptions[f->unit]; + u_char cimaxslotindex, ciflag, cilen; + u_short cishort; + u_int32_t cilong; + ipcp_options try; /* options to request next time */ + + try = *go; + /* + * Any Rejected CIs must be in exactly the same order that we sent. + * Check packet length and CI length at each step. + * If we find any deviations, then this packet is bad. + */ +#define REJCIADDR(opt, neg, old, val1, val2) \ + if (go->neg && \ + len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \ + p[1] == cilen && \ + p[0] == opt) { \ + u_int32_t l; \ + len -= cilen; \ + INCPTR(2, p); \ + GETLONG(l, p); \ + cilong = htonl(l); \ + /* Check rejected value. */ \ + if (cilong != val1) \ + goto bad; \ + if (old) { \ + GETLONG(l, p); \ + cilong = htonl(l); \ + /* Check rejected value. */ \ + if (cilong != val2) \ + goto bad; \ + } \ + try.neg = 0; \ + } + +#define REJCIVJ(opt, neg, val, old, maxslot, cflag) \ + if (go->neg && \ + p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \ + len >= p[1] && \ + p[0] == opt) { \ + len -= p[1]; \ + INCPTR(2, p); \ + GETSHORT(cishort, p); \ + /* Check rejected value. */ \ + if (cishort != val) \ + goto bad; \ + if (!old) { \ + GETCHAR(cimaxslotindex, p); \ + if (cimaxslotindex != maxslot) \ + goto bad; \ + GETCHAR(ciflag, p); \ + if (ciflag != cflag) \ + goto bad; \ + } \ + try.neg = 0; \ + } + + REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, + go->old_addrs, go->ouraddr, go->hisaddr); + + REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj, + go->maxslotindex, go->cflag); + + /* + * If there are any remaining CIs, then this packet is bad. + */ + if (len != 0) + goto bad; + /* + * Now we can update state. + */ + if (f->state != OPENED) + *go = try; + return 1; + +bad: + IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!")); + return 0; +} + + +/* + * ipcp_reqci - Check the peer's requested CIs and send appropriate response. + * + * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified + * appropriately. If reject_if_disagree is non-zero, doesn't return + * CONFNAK; returns CONFREJ if it can't return CONFACK. + */ +static int +ipcp_reqci(f, inp, len, reject_if_disagree) + fsm *f; + u_char *inp; /* Requested CIs */ + int *len; /* Length of requested CIs */ + int reject_if_disagree; +{ + ipcp_options *wo = &ipcp_wantoptions[f->unit]; + ipcp_options *ho = &ipcp_hisoptions[f->unit]; + ipcp_options *ao = &ipcp_allowoptions[f->unit]; + ipcp_options *go = &ipcp_gotoptions[f->unit]; + u_char *cip, *next; /* Pointer to current and next CIs */ + u_short cilen, citype; /* Parsed len, type */ + u_short cishort; /* Parsed short value */ + u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */ + int rc = CONFACK; /* Final packet return code */ + int orc; /* Individual option return code */ + u_char *p; /* Pointer to next char to parse */ + u_char *ucp = inp; /* Pointer to current output char */ + int l = *len; /* Length left */ + u_char maxslotindex, cflag; + int d; + + cis_received[f->unit] = 1; + + /* + * Reset all his options. + */ + BZERO(ho, sizeof(*ho)); + + /* + * Process all his options. + */ + next = inp; + while (l) { + orc = CONFACK; /* Assume success */ + cip = p = next; /* Remember begining of CI */ + if (l < 2 || /* Not enough data for CI header or */ + p[1] < 2 || /* CI length too small or */ + p[1] > l) { /* CI length too big? */ + IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!")); + orc = CONFREJ; /* Reject bad CI */ + cilen = l; /* Reject till end of packet */ + l = 0; /* Don't loop again */ + goto endswitch; + } + GETCHAR(citype, p); /* Parse CI type */ + GETCHAR(cilen, p); /* Parse CI length */ + l -= cilen; /* Adjust remaining length */ + next += cilen; /* Step to next CI */ + + switch (citype) { /* Check CI type */ + case CI_ADDRS: + IPCPDEBUG((LOG_INFO, "ipcp: received ADDRS ")); + if (!ao->neg_addr || + cilen != CILEN_ADDRS) { /* Check CI length */ + orc = CONFREJ; /* Reject CI */ + break; + } + + /* + * If he has no address, or if we both have his address but + * disagree about it, then NAK it with our idea. + * In particular, if we don't know his address, but he does, + * then accept it. + */ + GETLONG(tl, p); /* Parse source address (his) */ + ciaddr1 = htonl(tl); + IPCPDEBUG((LOG_INFO, "(%s:", ip_ntoa(ciaddr1))); + if (ciaddr1 != wo->hisaddr + && (ciaddr1 == 0 || !wo->accept_remote)) { + orc = CONFNAK; + if (!reject_if_disagree) { + DECPTR(sizeof(u_int32_t), p); + tl = ntohl(wo->hisaddr); + PUTLONG(tl, p); + } + } else if (ciaddr1 == 0 && wo->hisaddr == 0) { + /* + * If neither we nor he knows his address, reject the option. + */ + orc = CONFREJ; + wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ + break; + } + + /* + * If he doesn't know our address, or if we both have our address + * but disagree about it, then NAK it with our idea. + */ + GETLONG(tl, p); /* Parse desination address (ours) */ + ciaddr2 = htonl(tl); + IPCPDEBUG((LOG_INFO, "%s)", ip_ntoa(ciaddr2))); + if (ciaddr2 != wo->ouraddr) { + if (ciaddr2 == 0 || !wo->accept_local) { + orc = CONFNAK; + if (!reject_if_disagree) { + DECPTR(sizeof(u_int32_t), p); + tl = ntohl(wo->ouraddr); + PUTLONG(tl, p); + } + } else { + go->ouraddr = ciaddr2; /* accept peer's idea */ + } + } + + ho->neg_addr = 1; + ho->old_addrs = 1; + ho->hisaddr = ciaddr1; + ho->ouraddr = ciaddr2; + break; + + case CI_ADDR: + IPCPDEBUG((LOG_INFO, "ipcp: received ADDR ")); + + if (!ao->neg_addr || + cilen != CILEN_ADDR) { /* Check CI length */ + orc = CONFREJ; /* Reject CI */ + break; + } + + /* + * If he has no address, or if we both have his address but + * disagree about it, then NAK it with our idea. + * In particular, if we don't know his address, but he does, + * then accept it. + */ + GETLONG(tl, p); /* Parse source address (his) */ + ciaddr1 = htonl(tl); + IPCPDEBUG((LOG_INFO, "(%s)", ip_ntoa(ciaddr1))); + if (ciaddr1 != wo->hisaddr + && (ciaddr1 == 0 || !wo->accept_remote)) { + orc = CONFNAK; + if (!reject_if_disagree) { + DECPTR(sizeof(u_int32_t), p); + tl = ntohl(wo->hisaddr); + PUTLONG(tl, p); + } + } else if (ciaddr1 == 0 && wo->hisaddr == 0) { + /* + * Don't ACK an address of 0.0.0.0 - reject it instead. + */ + orc = CONFREJ; + wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ + break; + } + + ho->neg_addr = 1; + ho->hisaddr = ciaddr1; + break; + + case CI_MS_DNS1: + case CI_MS_DNS2: + /* Microsoft primary or secondary DNS request */ + d = citype == CI_MS_DNS2; + IPCPDEBUG((LOG_INFO, "ipcp: received DNS%d Request ", d+1)); + + /* If we do not have a DNS address then we cannot send it */ + if (ao->dnsaddr[d] == 0 || + cilen != CILEN_ADDR) { /* Check CI length */ + orc = CONFREJ; /* Reject CI */ + break; + } + GETLONG(tl, p); + if (htonl(tl) != ao->dnsaddr[d]) { + DECPTR(sizeof(u_int32_t), p); + tl = ntohl(ao->dnsaddr[d]); + PUTLONG(tl, p); + orc = CONFNAK; + } + break; + + case CI_MS_WINS1: + case CI_MS_WINS2: + /* Microsoft primary or secondary WINS request */ + d = citype == CI_MS_WINS2; + IPCPDEBUG((LOG_INFO, "ipcp: received WINS%d Request ", d+1)); + + /* If we do not have a DNS address then we cannot send it */ + if (ao->winsaddr[d] == 0 || + cilen != CILEN_ADDR) { /* Check CI length */ + orc = CONFREJ; /* Reject CI */ + break; + } + GETLONG(tl, p); + if (htonl(tl) != ao->winsaddr[d]) { + DECPTR(sizeof(u_int32_t), p); + tl = ntohl(ao->winsaddr[d]); + PUTLONG(tl, p); + orc = CONFNAK; + } + break; + + case CI_COMPRESSTYPE: + IPCPDEBUG((LOG_INFO, "ipcp: received COMPRESSTYPE ")); + if (!ao->neg_vj || + (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) { + orc = CONFREJ; + break; + } + GETSHORT(cishort, p); + IPCPDEBUG((LOG_INFO, "(%d)", cishort)); + + if (!(cishort == IPCP_VJ_COMP || + (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) { + orc = CONFREJ; + break; + } + + ho->neg_vj = 1; + ho->vj_protocol = cishort; + if (cilen == CILEN_VJ) { + GETCHAR(maxslotindex, p); + if (maxslotindex > ao->maxslotindex) { + orc = CONFNAK; + if (!reject_if_disagree){ + DECPTR(1, p); + PUTCHAR(ao->maxslotindex, p); + } + } + GETCHAR(cflag, p); + if (cflag && !ao->cflag) { + orc = CONFNAK; + if (!reject_if_disagree){ + DECPTR(1, p); + PUTCHAR(wo->cflag, p); + } + } + ho->maxslotindex = maxslotindex; + ho->cflag = cflag; + } else { + ho->old_vj = 1; + ho->maxslotindex = MAX_STATES - 1; + ho->cflag = 1; + } + break; + + default: + orc = CONFREJ; + break; + } + +endswitch: + IPCPDEBUG((LOG_INFO, " (%s)\n", CODENAME(orc))); + + if (orc == CONFACK && /* Good CI */ + rc != CONFACK) /* but prior CI wasnt? */ + continue; /* Don't send this one */ + + if (orc == CONFNAK) { /* Nak this CI? */ + if (reject_if_disagree) /* Getting fed up with sending NAKs? */ + orc = CONFREJ; /* Get tough if so */ + else { + if (rc == CONFREJ) /* Rejecting prior CI? */ + continue; /* Don't send this one */ + if (rc == CONFACK) { /* Ack'd all prior CIs? */ + rc = CONFNAK; /* Not anymore... */ + ucp = inp; /* Backup */ + } + } + } + + if (orc == CONFREJ && /* Reject this CI */ + rc != CONFREJ) { /* but no prior ones? */ + rc = CONFREJ; + ucp = inp; /* Backup */ + } + + /* Need to move CI? */ + if (ucp != cip) + BCOPY(cip, ucp, cilen); /* Move it */ + + /* Update output pointer */ + INCPTR(cilen, ucp); + } + + /* + * If we aren't rejecting this packet, and we want to negotiate + * their address, and they didn't send their address, then we + * send a NAK with a CI_ADDR option appended. We assume the + * input buffer is long enough that we can append the extra + * option safely. + */ + if (rc != CONFREJ && !ho->neg_addr && + wo->req_addr && !reject_if_disagree) { + if (rc == CONFACK) { + rc = CONFNAK; + ucp = inp; /* reset pointer */ + wo->req_addr = 0; /* don't ask again */ + } + PUTCHAR(CI_ADDR, ucp); + PUTCHAR(CILEN_ADDR, ucp); + tl = ntohl(wo->hisaddr); + PUTLONG(tl, ucp); + } + + *len = ucp - inp; /* Compute output length */ + IPCPDEBUG((LOG_INFO, "ipcp: returning Configure-%s", CODENAME(rc))); + return (rc); /* Return final code */ +} + + +/* + * ip_check_options - check that any IP-related options are OK, + * and assign appropriate defaults. + */ +static void +ip_check_options() +{ + struct hostent *hp; + u_int32_t local; + ipcp_options *wo = &ipcp_wantoptions[0]; + + /* + * Default our local IP address based on our hostname. + * If local IP address already given, don't bother. + */ + if (wo->ouraddr == 0 && !disable_defaultip) { + /* + * Look up our hostname (possibly with domain name appended) + * and take the first IP address as our local IP address. + * If there isn't an IP address for our hostname, too bad. + */ + wo->accept_local = 1; /* don't insist on this default value */ + if ((hp = gethostbyname(hostname)) != NULL) { + local = *(u_int32_t *)hp->h_addr; + if (local != 0 && !bad_ip_adrs(local)) + wo->ouraddr = local; + } + } + +} + + +/* + * ip_demand_conf - configure the interface as though + * IPCP were up, for use with dial-on-demand. + */ +static int +ip_demand_conf(u) + int u; +{ + ipcp_options *wo = &ipcp_wantoptions[u]; + + if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr))) + return 0; + if (!sifup(u)) + return 0; + if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE)) + return 0; + if (wo->default_route) + if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr)) + default_route_set[u] = 1; + if (wo->proxy_arp) + if (sifproxyarp(u, wo->hisaddr)) + proxy_arp_set[u] = 1; + + syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(wo->ouraddr)); + syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(wo->hisaddr)); + + return 1; +} + + +/* + * ipcp_up - IPCP has come UP. + * + * Configure the IP network interface appropriately and bring it up. + */ +#define script_setenv(a,b) + + +static void +ipcp_up(f) + fsm *f; +{ + u_int32_t mask; + ipcp_options *ho = &ipcp_hisoptions[f->unit]; + ipcp_options *go = &ipcp_gotoptions[f->unit]; + ipcp_options *wo = &ipcp_wantoptions[f->unit]; + + np_up(f->unit, PPP_IP); + IPCPDEBUG((LOG_INFO, "ipcp: up")); + + /* + * We must have a non-zero IP address for both ends of the link. + */ + if (!ho->neg_addr) + ho->hisaddr = wo->hisaddr; + + if (ho->hisaddr == 0) { + syslog(LOG_ERR, "Could not determine remote IP address"); + ipcp_close(f->unit, "Could not determine remote IP address"); + return; + } + if (go->ouraddr == 0) { + syslog(LOG_ERR, "Could not determine local IP address"); + ipcp_close(f->unit, "Could not determine local IP address"); + return; + } +/* script_setenv("IPLOCAL", ip_ntoa(go->ouraddr)); + script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr)); +*/ + /* + * Check that the peer is allowed to use the IP address it wants. + */ + if (!auth_ip_addr(f->unit, ho->hisaddr)) { + syslog(LOG_ERR, "Peer is not authorized to use remote address %s", + ip_ntoa(ho->hisaddr)); + ipcp_close(f->unit, "Unauthorized remote IP address"); + return; + } + + /* set tcp compression */ + sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex); + + /* + * If we are doing dial-on-demand, the interface is already + * configured, so we put out any saved-up packets, then set the + * interface to pass IP packets. + */ + { + /* + * Set IP addresses and (if specified) netmask. + */ + mask = GetMask(go->ouraddr); + +#if !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) + if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { + IPCPDEBUG((LOG_WARNING, "sifaddr failed")); + ipcp_close(f->unit, "Interface configuration failed"); + return; + } +#endif + + /* bring the interface up for IP */ + if (!sifup(f->unit)) { + IPCPDEBUG((LOG_WARNING, "sifup failed")); + ipcp_close(f->unit, "Interface configuration failed"); + return; + } + +#if (defined(SVR4) && (defined(SNI) || defined(__USLC__))) + if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { + IPCPDEBUG((LOG_WARNING, "sifaddr failed")); + ipcp_close(f->unit, "Interface configuration failed"); + return; + } +#endif + sifnpmode(f->unit, PPP_IP, NPMODE_PASS); + + /* assign a default route through the interface if required */ + if (ipcp_wantoptions[f->unit].default_route) + if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) + default_route_set[f->unit] = 1; + + /* Make a proxy ARP entry if requested. */ + if (ipcp_wantoptions[f->unit].proxy_arp) + if (sifproxyarp(f->unit, ho->hisaddr)) + proxy_arp_set[f->unit] = 1; + + syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(go->ouraddr)); + syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(ho->hisaddr)); + } + + /* + * Execute the ip-up script, like this: + * /etc/ppp/ip-up interface tty speed local-IP remote-IP + */ + { +#if 0 +/* XXX PPPConfiguration */ + GlobalSystemStatus *stat; + stat=LockSTBSystemParam(); + stat->ConnectionStatus=Connected; + UnlockSTBSystemParam(); +#endif + } +} + + +/* + * ipcp_down - IPCP has gone DOWN. + * + * Take the IP network interface down, clear its addresses + * and delete routes through it. + */ +static void +ipcp_down(f) + fsm *f; +{ + IPCPDEBUG((LOG_INFO, "ipcp: down")); + np_down(f->unit, PPP_IP); + sifvjcomp(f->unit, 0, 0, 0); + + /* + * If we are doing dial-on-demand, set the interface + * to queue up outgoing packets (for now). + */ + sifdown(f->unit); + ipcp_clear_addrs(f->unit); + + /* Execute the ip-down script */ + { +#if 0 +/* XXX PPPConfiguration */ + GlobalSystemStatus *stat; + stat=LockSTBSystemParam(); + stat->ConnectionStatus=NotConnected; + UnlockSTBSystemParam(); +#endif + } +} + + +/* + * ipcp_clear_addrs() - clear the interface addresses, routes, + * proxy arp entries, etc. + */ +static void +ipcp_clear_addrs(unit) + int unit; +{ + u_int32_t ouraddr, hisaddr; + + ouraddr = ipcp_gotoptions[unit].ouraddr; + hisaddr = ipcp_hisoptions[unit].hisaddr; + if (proxy_arp_set[unit]) { + cifproxyarp(unit, hisaddr); + proxy_arp_set[unit] = 0; + } + if (default_route_set[unit]) { + cifdefaultroute(unit, ouraddr, hisaddr); + default_route_set[unit] = 0; + } + cifaddr(unit, ouraddr, hisaddr); +} + + +/* + * ipcp_finished - possibly shut down the lower layers. + */ +static void +ipcp_finished(f) + fsm *f; +{ + np_finished(f->unit, PPP_IP); +} + + +#if 0 +/* + * ipcp_script - Execute a script with arguments + * interface-name tty-name speed local-IP remote-IP. + */ +static void +ipcp_script(f, script) + fsm *f; + char *script; +{ + char strspeed[32], strlocal[32], strremote[32]; + char *argv[8]; + + sprintf(strspeed, "%d", baud_rate); + strcpy(strlocal, ip_ntoa(ipcp_gotoptions[f->unit].ouraddr)); + strcpy(strremote, ip_ntoa(ipcp_hisoptions[f->unit].hisaddr)); + + argv[0] = script; + argv[1] = ifname; + argv[2] = devnam; + argv[3] = strspeed; + argv[4] = strlocal; + argv[5] = strremote; + argv[6] = ipparam; + argv[7] = NULL; + run_program(script, argv, 0); +} +#endif + +/* + * ipcp_printpkt - print the contents of an IPCP packet. + */ +static char *ipcp_codenames[] = { + "ConfReq", "ConfAck", "ConfNak", "ConfRej", + "TermReq", "TermAck", "CodeRej" +}; + +static int +ipcp_printpkt(p, plen, printer, arg) + u_char *p; + int plen; + void (*printer) __P((void *, char *, ...)); + void *arg; +{ + int code, id, len, olen; + u_char *pstart, *optend; + u_short cishort; + u_int32_t cilong; + + if (plen < HEADERLEN) + return 0; + pstart = p; + GETCHAR(code, p); + GETCHAR(id, p); + GETSHORT(len, p); + if (len < HEADERLEN || len > plen) + return 0; + + if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *)) + printer(arg, " %s", ipcp_codenames[code-1]); + else + printer(arg, " code=0x%x", code); + printer(arg, " id=0x%x", id); + len -= HEADERLEN; + switch (code) { + case CONFREQ: + case CONFACK: + case CONFNAK: + case CONFREJ: + + while (len >= 2) { + GETCHAR(code, p); + GETCHAR(olen, p); + p -= 2; + if (olen < 2 || olen > len) { + break; + } + printer(arg, " <"); + len -= olen; + optend = p + olen; + switch (code) { + case CI_ADDRS: + if (olen == CILEN_ADDRS) { + p += 2; + GETLONG(cilong, p); + printer(arg, "addrs %I", htonl(cilong)); + GETLONG(cilong, p); + printer(arg, " %I", htonl(cilong)); + } + break; + case CI_COMPRESSTYPE: + if (olen >= CILEN_COMPRESS) { + p += 2; + GETSHORT(cishort, p); + printer(arg, "compress "); + switch (cishort) { + case IPCP_VJ_COMP: + printer(arg, "VJ"); + break; + case IPCP_VJ_COMP_OLD: + printer(arg, "old-VJ"); + break; + default: + printer(arg, "0x%x", cishort); + } + } + break; + case CI_ADDR: + if (olen == CILEN_ADDR) { + p += 2; + GETLONG(cilong, p); + printer(arg, "addr %I", htonl(cilong)); + } + break; + case CI_MS_DNS1: + case CI_MS_DNS2: + p += 2; + GETLONG(cilong, p); + printer(arg, "ms-dns %I", htonl(cilong)); + break; + case CI_MS_WINS1: + case CI_MS_WINS2: + p += 2; + GETLONG(cilong, p); + printer(arg, "ms-wins %I", htonl(cilong)); + break; + } + while (p < optend) { + GETCHAR(code, p); + printer(arg, " %.2x", code); + } + printer(arg, ">"); + } + break; + + case TERMACK: + case TERMREQ: + if (len > 0 && *p >= ' ' && *p < 0x7f) { + printer(arg, " "); + print_string(p, len, printer, arg); + p += len; + len = 0; + } + break; + } + + for (; len > 0; --len) { + GETCHAR(code, p); + printer(arg, " %.2x", code); + } + + return p - pstart; +} + +/* + * ip_active_pkt - see if this IP packet is worth bringing the link up for. + * We don't bring the link up for IP fragments or for TCP FIN packets + * with no data. + */ +#define IP_HDRLEN 20 /* bytes */ +#define IP_OFFMASK 0x1fff +#define IPPROTO_TCP 6 +#define TCP_HDRLEN 20 +#define TH_FIN 0x01 + +/* + * We use these macros because the IP header may be at an odd address, + * and some compilers might use word loads to get th_off or ip_hl. + */ + +#define net_short(x) (((x)[0] << 8) + (x)[1]) +#define get_iphl(x) (((unsigned char *)(x))[0] & 0xF) +#define get_ipoff(x) net_short((unsigned char *)(x) + 6) +#define get_ipproto(x) (((unsigned char *)(x))[9]) +#define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) +#define get_tcpflags(x) (((unsigned char *)(x))[13]) + +static int +ip_active_pkt(pkt, len) + u_char *pkt; + int len; +{ + u_char *tcp; + int hlen; + + len -= PPP_HDRLEN; + pkt += PPP_HDRLEN; + if (len < IP_HDRLEN) + return 0; + if ((get_ipoff(pkt) & IP_OFFMASK) != 0) + return 0; + if (get_ipproto(pkt) != IPPROTO_TCP) + return 1; + hlen = get_iphl(pkt) * 4; + if (len < hlen + TCP_HDRLEN) + return 0; + tcp = pkt + hlen; + if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) + return 0; + return 1; +} |