/*
* ipcp.c - PPP IP Control Protocol.
*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* 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.
*/
#define RCSID "$Id: ipcp.c,v 1.54 2000/04/15 01:27:11 masputra Exp $"
/*
* TODO:
*/
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#if defined(_linux_) || defined(__linux__)
#define __FAVOR_BSD
#endif
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include "pppd.h"
#include "fsm.h"
#include "ipcp.h"
#include "pathnames.h"
#if !defined(lint) && !defined(_lint)
static const char rcsid[] = RCSID;
#endif
/* 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 */
bool ipcp_from_hostname = 0; /* Local IP address is from hostname lookup */
/* Hook for a plugin to know when IP protocol has come up */
void (*ip_up_hook) __P((void)) = NULL;
/* Hook for a plugin to know when IP protocol has come down */
void (*ip_down_hook) __P((void)) = NULL;
/* local vars */
static bool default_route_set[NUM_PPP]; /* Have set up a default route */
static bool proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */
static bool ipcp_is_up[NUM_PPP]; /* have called np_up() */
static bool proxy_arp_quiet[NUM_PPP]; /* We should be quiet on error */
static bool disable_defaultip = 0; /* Don't use hostname for IP addr */
/*
* 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 */
static void ipcp_finished __P((fsm *)); /* Don't need lower layer */
static int setmsservaddr __P((char *, u_int32_t *));
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, /* Retransmission is necessary */
NULL, /* Called to handle protocol-specific codes */
"IPCP", /* String name of protocol */
NULL /* Peer rejected a code number */
};
/*
* Command-line options.
*/
static int setvjslots __P((char **));
static int setdnsaddr __P((char **));
static int setwinsaddr __P((char **));
static int autoproxyarp __P((char **));
static option_t ipcp_option_list[] = {
{ "noip", o_bool, &ipcp_protent.enabled_flag,
"Disable IP and IPCP" },
{ "-ip", o_bool, &ipcp_protent.enabled_flag,
"Disable IP and IPCP" },
{ "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
"Disable VJ compression", OPT_A2COPY, &ipcp_allowoptions[0].neg_vj },
{ "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
"Disable VJ compression", OPT_A2COPY, &ipcp_allowoptions[0].neg_vj },
{ "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
"Disable VJ connection-ID compression", OPT_A2COPY,
&ipcp_allowoptions[0].cflag },
{ "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
"Disable VJ connection-ID compression", OPT_A2COPY,
&ipcp_allowoptions[0].cflag },
{ "vj-max-slots", o_special, (void *)setvjslots,
"Set maximum VJ header slots" },
{ "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local,
"Accept peer's address for us", 1 },
{ "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote,
"Accept peer's address for it", 1 },
{ "ipparam", o_string, &ipparam,
"Set ip script parameter" },
{ "noipdefault", o_bool, &disable_defaultip,
"Don't use name for default IP adrs", 1 },
{ "ms-dns", o_special, (void *)setdnsaddr,
"DNS address for the peer's use" },
{ "ms-wins", o_special, (void *)setwinsaddr,
"Nameserver for SMB over TCP/IP for peer" },
{ "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
"Set timeout for IPCP" },
{ "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
"Set max #xmits for term-reqs" },
{ "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
"Set max #xmits for conf-reqs" },
{ "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
"Set max #conf-naks for IPCP" },
{ "defaultroute", o_bool, &ipcp_wantoptions[0].default_route,
"Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route },
{ "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route,
"disable defaultroute option", OPT_A2COPY,
&ipcp_wantoptions[0].default_route },
{ "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
"disable defaultroute option", OPT_A2COPY,
&ipcp_wantoptions[0].default_route },
{ "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
"Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
{ "autoproxyarp", o_special_noarg, (void *)autoproxyarp,
"Add proxy ARP entry if needed", OPT_ENABLE,
&ipcp_allowoptions[0].proxy_arp },
{ "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
"disable proxyarp option", OPT_A2COPY, &ipcp_wantoptions[0].proxy_arp },
{ "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
"disable proxyarp option", OPT_A2COPY, &ipcp_wantoptions[0].proxy_arp },
{ "usepeerdns", o_bool, &ipcp_wantoptions[0].req_dns1,
"Ask peer for DNS address(es)", OPT_A2COPY|1,
&ipcp_wantoptions[0].req_dns2 },
{ NULL }
};
/*
* 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 *, const 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));
static void ipcp_print_stat __P((int, FILE *));
static void create_resolv __P((u_int32_t, u_int32_t));
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",
ipcp_option_list,
ip_check_options,
ip_demand_conf,
ip_active_pkt,
ipcp_print_stat
};
static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t));
static void ipcp_script __P((char *)); /* Run an up/down script */
static void ipcp_script_done __P((void *, 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 */
/*
* This state variable is used to ensure that we don't
* run an ipcp-up/down script while one is already running.
*/
static enum script_state {
s_down,
s_up
} ipcp_script_state;
static pid_t ipcp_script_pid;
/*
* Make a string representation of a network IP address.
*/
char *
ip_ntoa(ipaddr)
u_int32_t ipaddr;
{
static char b[64];
(void) slprintf(b, sizeof(b), "%I", ipaddr);
return b;
}
/*
* Option parsing.
*/
/*
* setvjslots - set maximum number of connection slots for VJ compression
*/
static int
setvjslots(argv)
char **argv;
{
int value;
if (!int_option(*argv, &value))
return 0;
if (value < 2 || value > 16) {
option_error("vj-max-slots value must be between 2 and 16");
return 0;
}
ipcp_wantoptions [0].maxslotindex =
ipcp_allowoptions[0].maxslotindex = value - 1;
return 1;
}
/*
* setmsservaddr - Set the primary and secondary server addresses in the
* array. setdnsaddr() and setwinsaddr() call this function with either
* dnsaddr[] or winsaddr[] as the serverarray argument.
*/
static int
setmsservaddr(servname, serverarray)
char *servname;
u_int32_t *serverarray;
{
u_int32_t addr;
struct hostent *hp = NULL;
addr = inet_addr(servname);
if (addr == (u_int32_t) -1) {
if ((hp = gethostbyname(servname)) == NULL)
return 0;
BCOPY(hp->h_addr, &addr, sizeof (u_int32_t));
}
/*
* If there is no primary then this is the first instance of the
* option, we must set the primary. In that case, try to set the
* secondary to h_addr_list[1]. If the primary is already set, then
* this is the second instance of the option, and we must set
* the secondary.
*/
if (serverarray[0] == 0) {
serverarray[0] = addr;
if (hp != NULL && hp->h_addr_list[1] != NULL)
BCOPY(hp->h_addr_list[1], &serverarray[1], sizeof (u_int32_t));
else
serverarray[1] = addr;
} else {
serverarray[1] = addr;
}
return (1);
}
/*
* setdnsaddr - set the dns address(es)
*/
static int
setdnsaddr(argv)
char **argv;
{
if (setmsservaddr(*argv, &(ipcp_allowoptions[0].dnsaddr[0])) == 0) {
option_error("invalid address parameter '%s' for ms-dns option", *argv);
return (0);
}
return (1);
}
/*
* setwinsaddr - set the wins address(es)
* This is primrarly used with the Samba package under UNIX or for pointing
* the caller to the existing WINS server on a Windows NT platform.
*/
static int
setwinsaddr(argv)
char **argv;
{
if (setmsservaddr(*argv, &(ipcp_allowoptions[0].winsaddr[0])) == 0) {
option_error("invalid address parameter '%s' for ms-wins option",
*argv);
return (0);
}
return (1);
}
/*
* autoproxyarp -- enable proxy ARP but don't emit error messages if
* it's not actually needed.
*/
/*ARGSUSED*/
static int
autoproxyarp(argv)
char **argv;
{
ipcp_wantoptions[0].proxy_arp = 1;
proxy_arp_quiet[0] = 1;
return (1);
}
/*
* 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]);
BZERO(wo, sizeof(*wo));
BZERO(ao, sizeof(*ao));
wo->neg_addr = wo->old_addrs = 1;
wo->neg_vj = 1;
wo->vj_protocol = IPCP_VJ_COMP;
wo->maxslotindex = MAX_STATES - 1; /* really max index */
wo->cflag = 1;
ao->neg_addr = ao->old_addrs = 1;
ao->neg_vj = 1;
ao->maxslotindex = MAX_STATES - 1;
ao->cflag = 1;
/*
* These aren't actually negotiated. Instead, they control
* whether the user may use the proxyarp and defaultroute options.
*/
ao->proxy_arp = 1;
ao->default_route = 1;
proxy_arp_quiet[unit] = 0;
}
/*
* 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.
*/
static void
ipcp_protrej(unit)
int unit;
{
fsm_protreject(&ipcp_fsm[unit]);
}
/*
* ipcp_resetci - Reset our CI.
* Called by fsm_sconfreq, Send Configure Request.
*/
static void
ipcp_resetci(f)
fsm *f;
{
ipcp_options *wo = &ipcp_wantoptions[f->unit];
ipcp_options *go = &ipcp_gotoptions[f->unit];
ipcp_options *ao = &ipcp_allowoptions[f->unit];
wo->req_addr = (wo->neg_addr || wo->old_addrs) &&
(ao->neg_addr || ao->old_addrs);
if (wo->ouraddr == 0 || disable_defaultip)
wo->accept_local = 1;
if (wo->hisaddr == 0)
wo->accept_remote = 1;
*go = *wo;
if (disable_defaultip)
go->ouraddr = 0;
}
/*
* ipcp_cilen - Return length of our CI.
* Called by fsm_sconfreq, Send Configure Request.
*/
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 LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0)
#define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
#define LENCIADDR(neg) (neg ? (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 (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs)
/* use the old style of address negotiation */
go->neg_addr = 0;
if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
/* try an older style of VJ negotiation */
/* 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 (LENCIADDRS(!go->neg_addr && go->old_addrs) +
LENCIVJ(go->neg_vj, go->old_vj) +
LENCIADDR(go->neg_addr) +
LENCIADDR(go->req_dns1) +
LENCIADDR(go->req_dns2)) ;
}
/*
* ipcp_addci - Add our desired CIs to a packet.
* Called by fsm_sconfreq, Send Configure Request.
*/
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 ADDCIADDRS(opt, neg, val1, val2) \
if (neg) { \
if (len >= CILEN_ADDRS) { \
PUTCHAR(opt, ucp); \
PUTCHAR(CILEN_ADDRS, ucp); \
PUTNLONG(val1, ucp); \
PUTNLONG(val2, ucp); \
len -= CILEN_ADDRS; \
} else \
go->old_addrs = 0; \
}
#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, val) \
if (neg) { \
if (len >= CILEN_ADDR) { \
PUTCHAR(opt, ucp); \
PUTCHAR(CILEN_ADDR, ucp); \
PUTNLONG(val, ucp); \
len -= CILEN_ADDR; \
} else \
neg = 0; \
}
ADDCIADDRS(CI_ADDRS, !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);
ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
ADDCIADDR(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
ADDCIADDR(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
*lenp -= len;
}
/*
* ipcp_ackci - Ack our CIs.
* Called by fsm_rconfack, Receive Configure ACK.
*
* 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 ACKCHECK(opt, olen) \
if ((len -= olen) < 0) \
goto bad; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != olen || \
citype != opt) \
goto bad;
#define ACKCIADDRS(opt, neg, val1, val2) \
if (neg) { \
ACKCHECK(opt, CILEN_ADDRS) \
GETNLONG(cilong, p); \
if (val1 != cilong) \
goto bad; \
GETNLONG(cilong, p); \
if (val2 != cilong) \
goto bad; \
}
#define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
if (neg) { \
int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
ACKCHECK(opt, vjlen) \
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, val) \
if (neg) { \
ACKCHECK(opt, CILEN_ADDR) \
GETNLONG(cilong, p); \
if (val != cilong) \
goto bad; \
}
ACKCIADDRS(CI_ADDRS, !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);
ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
ACKCIADDR(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
ACKCIADDR(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
/*
* If there are any remaining CIs, then this packet is bad.
*/
if (len != 0)
goto bad;
return (1);
bad:
IPCPDEBUG(("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.
* Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
*
* 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;
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 NAKCIADDRS(opt, neg, code) \
if ((neg) && \
(cilen = p[1]) == CILEN_ADDRS && \
len >= cilen && \
p[0] == opt) { \
len -= cilen; \
INCPTR(2, p); \
GETNLONG(ciaddr1, p); \
GETNLONG(ciaddr2, p); \
no.old_addrs = 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 \
}
#define NAKCIADDR(opt, neg, code) \
if (go->neg && \
(cilen = p[1]) == CILEN_ADDR && \
len >= cilen && \
p[0] == opt) { \
len -= cilen; \
INCPTR(2, p); \
GETNLONG(ciaddr1, 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.
*/
NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
if (go->accept_local && ciaddr1) { /* Do we know our address? */
try.ouraddr = ciaddr1;
}
if (go->accept_remote && ciaddr2) { /* Does he know his? */
try.hisaddr = 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;
}
}
);
NAKCIADDR(CI_ADDR, neg_addr,
if (go->accept_local && ciaddr1) { /* Do we know our address? */
try.ouraddr = ciaddr1;
}
);
NAKCIADDR(CI_MS_DNS1, req_dns1,
try.dnsaddr[0] = ciaddr1;
);
NAKCIADDR(CI_MS_DNS2, req_dns2,
try.dnsaddr[1] = ciaddr1;
);
/*
* 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;
GETNLONG(ciaddr1, p);
if (ciaddr1 && go->accept_local)
try.ouraddr = ciaddr1;
GETNLONG(ciaddr2, p);
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;
GETNLONG(ciaddr1, p);
if (ciaddr1 && go->accept_local)
try.ouraddr = ciaddr1;
if (try.ouraddr != 0)
try.neg_addr = 1;
no.neg_addr = 1;
break;
}
p = next;
}
/*
* OK, the Nak is good. Now we can update state.
* If there are any remaining options, we ignore them.
*/
if (f->state != OPENED)
*go = try;
return 1;
bad:
IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
return 0;
}
/*
* ipcp_rejci - Reject some of our CIs.
* Callback from fsm_rconfnakrej.
*/
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 REJCIADDRS(opt, neg, val1, val2) \
if ((neg) && \
(cilen = p[1]) == CILEN_ADDRS && \
len >= cilen && \
p[0] == opt) { \
len -= cilen; \
INCPTR(2, p); \
GETNLONG(cilong, p); \
/* Check rejected value. */ \
if (cilong != val1) \
goto bad; \
GETNLONG(cilong, p); \
/* Check rejected value. */ \
if (cilong != val2) \
goto bad; \
try.old_addrs = 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; \
}
#define REJCIADDR(opt, neg, addr) \
if (go->neg && \
((cilen = p[1]) == CILEN_ADDR) && \
len >= cilen && \
p[0] == opt) { \
len -= cilen; \
INCPTR(2, p); \
GETNLONG(cilong, p); \
/* Check rejected value. */ \
if (cilong != addr) \
goto bad; \
try.neg = 0; \
}
REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
go->ouraddr, go->hisaddr);
REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
go->maxslotindex, go->cflag);
REJCIADDR(CI_ADDR, neg_addr, go->ouraddr);
REJCIADDR(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
REJCIADDR(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
/*
* 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(("ipcp_rejci: received bad Reject!"));
return 0;
}
/*
* ipcp_reqci - Check the peer's requested CIs and send appropriate response.
* Callback from fsm_rconfreq, Receive Configure Request
*
* Returns: CODE_CONFACK, CODE_CONFNAK or CODE_CONFREJ and input
* packet modified appropriately. If reject_if_disagree is non-zero,
* doesn't return CODE_CONFNAK; returns CODE_CONFREJ if it can't
* return CODE_CONFACK.
*/
static int
ipcp_reqci(f, p, lenp, dont_nak)
fsm *f;
u_char *p; /* Requested CIs */
int *lenp; /* Length of requested CIs */
bool dont_nak;
{
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];
int ret, newret;
u_char *p0, *nakp, *rejp, *prev;
u_short cishort;
int len, cilen, type;
u_int32_t tl, ciaddr1, ciaddr2; /* Parsed address values */
u_char maxslotindex, cflag;
int d;
ret = CODE_CONFACK;
rejp = p0 = p;
nakp = nak_buffer;
/*
* Reset all his options.
*/
BZERO(ho, sizeof(*ho));
/*
* Process all his options.
*/
for (len = *lenp; len > 0; len -= cilen, p = prev + cilen) {
if ((len < 2) || p[1] > len) {
/*
* RFC 1661 page 40 -- if the option extends beyond the
* packet, then discard the entire packet.
*/
return (0);
}
newret = CODE_CONFACK;
prev = p;
GETCHAR(type, p);
GETCHAR(cilen, p);
switch (type) { /* Check CI type */
case CI_ADDRS:
if (!ao->old_addrs || ho->neg_addr) {
newret = CODE_CONFREJ;
break;
}
if (cilen != CILEN_ADDRS) {
/*
* rfc1661, page 40 -- a recongnized option with an
* invalid length should be Nak'ed.
*/
newret = CODE_CONFNAK;
ciaddr1 = wo->hisaddr;
ciaddr2 = wo->ouraddr;
} else {
/*
* 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.
*/
GETNLONG(ciaddr1, p);
if (ciaddr1 != wo->hisaddr &&
(ciaddr1 == 0 || !wo->accept_remote)) {
newret = CODE_CONFNAK;
ciaddr1 = wo->hisaddr;
} else if (ciaddr1 == 0 && wo->hisaddr == 0) {
/*
* If neither we nor he knows his address, reject
* the option.
*/
newret = CODE_CONFREJ;
wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
break;
} else if (ciaddr1 != 0) {
go->hisaddr = ciaddr1;
}
/*
* If he doesn't know our address, or if we both have
* our address * but disagree about it, then NAK it
* with our idea.
*/
GETNLONG(ciaddr2, p);
if (ciaddr2 != wo->ouraddr) {
if (ciaddr2 == 0 || !wo->accept_local) {
newret = CODE_CONFNAK;
ciaddr2 = wo->ouraddr;
} else {
go->ouraddr = ciaddr2; /* accept peer's idea */
}
}
}
if (newret == CODE_CONFNAK) {
PUTCHAR(type, nakp);
PUTCHAR(CILEN_ADDRS, nakp);
PUTNLONG(ciaddr1, nakp);
PUTNLONG(ciaddr2, nakp);
}
ho->old_addrs = 1;
ho->hisaddr = ciaddr1;
ho->ouraddr = ciaddr2;
break;
case CI_ADDR:
if (!ao->neg_addr || ho->old_addrs) {
newret = CODE_CONFREJ;
break;
}
if (cilen != CILEN_ADDR) {
/*
* rfc1661, page 40 -- a recongnized option with an
* invalid length should be Nak'ed.
*/
newret = CODE_CONFNAK;
ciaddr1 = wo->hisaddr;
} else {
/*
* 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.
*/
GETNLONG(ciaddr1, p);
if (ciaddr1 != wo->hisaddr &&
(ciaddr1 == 0 || !wo->accept_remote)) {
newret = CODE_CONFNAK;
ciaddr1 = wo->hisaddr;
} else if (ciaddr1 == 0 && wo->hisaddr == 0 &&
wo->default_route != 0) {
newret = CODE_CONFNAK;
/*
* If this is a dialup line (default_route is
* set), and neither side knows about his address,
* suggest an arbitrary rfc1918 address.
*/
ciaddr1 = htonl(0xc0a80101 + ifunit);
dbglog("Peer address unknown; suggesting %I", ciaddr1);
} else if (ciaddr1 == 0 && wo->hisaddr == 0) {
/*
* If this is not a dialup line, don't ACK an
* address of 0.0.0.0 - reject it instead.
*/
newret = CODE_CONFREJ;
wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
break;
}
}
if (newret == CODE_CONFNAK) {
PUTCHAR(type, nakp);
PUTCHAR(CILEN_ADDR, nakp);
PUTNLONG(ciaddr1, nakp);
}
ho->neg_addr = 1;
ho->hisaddr = ciaddr1;
break;
case CI_MS_DNS1:
case CI_MS_DNS2:
/* Warning -- these options work backwards. */
/* Microsoft primary or secondary DNS request */
d = (type == CI_MS_DNS2 ? 1 : 0);
if (ao->dnsaddr[d] == 0) {
newret = CODE_CONFREJ;
break;
}
if (cilen != CILEN_ADDR) {
newret = CODE_CONFNAK;
} else {
GETNLONG(tl, p);
if (tl != ao->dnsaddr[d]) {
newret = CODE_CONFNAK;
}
}
if (newret == CODE_CONFNAK) {
PUTCHAR(type, nakp);
PUTCHAR(CILEN_ADDR, nakp);
PUTNLONG(ao->dnsaddr[d], nakp);
}
break;
case CI_MS_WINS1:
case CI_MS_WINS2:
/* Warning -- these options work backwards. */
/* Microsoft primary or secondary WINS request */
d = (type == CI_MS_WINS2 ? 1 : 0);
if (ao->winsaddr[d] == 0) {
newret = CODE_CONFREJ;
break;
}
if (cilen != CILEN_ADDR) {
newret = CODE_CONFNAK;
} else {
GETNLONG(tl, p);
if (tl != ao->winsaddr[d]) {
newret = CODE_CONFNAK;
}
}
if (newret == CODE_CONFNAK) {
PUTCHAR(type, nakp);
PUTCHAR(CILEN_ADDR, nakp);
PUTNLONG(ao->winsaddr[d], nakp);
}
break;
case CI_COMPRESSTYPE:
if (!ao->neg_vj) {
newret = CODE_CONFREJ;
break;
}
maxslotindex = ao->maxslotindex;
cflag = ao->cflag;
if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) {
newret = CODE_CONFNAK;
cishort = IPCP_VJ_COMP;
} else {
GETSHORT(cishort, p);
if (cishort != IPCP_VJ_COMP &&
(cishort != IPCP_VJ_COMP_OLD || cilen != CILEN_COMPRESS)) {
newret = CODE_CONFNAK;
cishort = IPCP_VJ_COMP;
} else if (cilen == CILEN_VJ) {
GETCHAR(maxslotindex, p);
if (maxslotindex > ao->maxslotindex) {
newret = CODE_CONFNAK;
maxslotindex = ao->maxslotindex;
}
GETCHAR(cflag, p);
if (cflag != 0 && ao->cflag == 0) {
newret = CODE_CONFNAK;
cflag = 0;
}
} else {
ho->old_vj = 1;
maxslotindex = MAX_STATES - 1;
cflag = 1;
}
}
if (newret == CODE_CONFNAK) {
PUTCHAR(type, nakp);
if (cishort == IPCP_VJ_COMP) {
PUTCHAR(CILEN_VJ, nakp);
PUTSHORT(cishort, nakp);
PUTCHAR(maxslotindex, nakp);
PUTCHAR(cflag, nakp);
} else {
PUTCHAR(CILEN_COMPRESS, nakp);
PUTSHORT(cishort, nakp);
}
}
ho->neg_vj = 1;
ho->vj_protocol = cishort;
ho->maxslotindex = maxslotindex;
ho->cflag = cflag;
break;
default:
newret = CODE_CONFREJ;
break;
}
/* Cope with confused peers. */
if (cilen < 2)
cilen = 2;
/*
* If this is an Ack'able CI, but we're sending back a Nak,
* don't include this CI.
*/
if (newret == CODE_CONFACK && ret != CODE_CONFACK)
continue;
if (newret == CODE_CONFNAK) {
if (dont_nak) {
newret = CODE_CONFREJ;
} else {
/* Ignore subsequent Nak'able things if rejecting. */
if (ret == CODE_CONFREJ)
continue;
ret = CODE_CONFNAK;
}
}
if (newret == CODE_CONFREJ) {
ret = CODE_CONFREJ;
if (prev != rejp)
BCOPY(prev, rejp, cilen);
rejp += cilen;
}
}
/*
* 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 (ret != CODE_CONFREJ && !ho->neg_addr && !ho->old_addrs &&
wo->req_addr && !dont_nak) {
if (ret == CODE_CONFACK)
wo->req_addr = 0; /* don't ask again */
ret = CODE_CONFNAK;
PUTCHAR(CI_ADDR, nakp);
PUTCHAR(CILEN_ADDR, nakp);
PUTNLONG(wo->hisaddr, nakp);
}
switch (ret) {
case CODE_CONFACK:
*lenp = p - p0;
sys_block_proto(PPP_IP);
break;
case CODE_CONFNAK:
*lenp = nakp - nak_buffer;
BCOPY(nak_buffer, p0, *lenp);
break;
case CODE_CONFREJ:
*lenp = rejp - p0;
break;
}
return (ret); /* 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) {
/*
* 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) {
BCOPY(hp->h_addr, &local, sizeof (hp->h_addr));
if (local != 0 && !bad_ip_adrs(local)) {
wo->ouraddr = local;
ipcp_from_hostname = 1;
}
}
}
}
/*
* 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 (wo->hisaddr == 0) {
/* make up an arbitrary address for the peer */
wo->hisaddr = htonl(0x0a707070 + ifunit);
wo->accept_remote = 1;
}
if (wo->ouraddr == 0) {
/* make up an arbitrary address for us */
wo->ouraddr = htonl(0x0a404040 + ifunit);
wo->accept_local = 1;
disable_defaultip = 1; /* don't tell the peer this address */
}
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 && sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
default_route_set[u] = 1;
if (wo->proxy_arp && sifproxyarp(u, wo->hisaddr, proxy_arp_quiet[u]))
proxy_arp_set[u] = 1;
notice("local IP address %I", wo->ouraddr);
notice("remote IP address %I", wo->hisaddr);
return 1;
}
/*
* ipcp_up - IPCP has come UP.
*
* Configure the IP network interface appropriately and bring it up.
*/
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];
IPCPDEBUG(("ipcp: up"));
/*
* We must have a non-zero IP address for both ends of the link.
*/
if (ho->hisaddr == 0)
ho->hisaddr = wo->hisaddr;
if (ho->hisaddr == 0) {
if (wo->accept_remote) {
/* Pick some rfc1918 address. */
ho->hisaddr = htonl(0xc0a80101 + ifunit);
dbglog("Peer refused to provide his address; assuming %I",
ho->hisaddr);
} else {
error("Could not determine remote IP address");
ipcp_close(f->unit, "Could not determine remote IP address");
return;
}
}
if (go->ouraddr == 0) {
error("Could not determine local IP address");
ipcp_close(f->unit, "Could not determine local IP address");
return;
}
script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
/*
* Check that the peer is allowed to use the IP address it wants.
*/
if (!auth_ip_addr(f->unit, ho->hisaddr)) {
error("Peer is not authorized to use remote address %I", ho->hisaddr);
ipcp_close(f->unit, "Unauthorized remote IP address");
return;
}
if ((go->req_dns1 && go->dnsaddr[0] != 0) ||
(go->req_dns2 && go->dnsaddr[1] != 0)) {
script_setenv("USEPEERDNS", "1", 0);
if (go->dnsaddr[0] != 0)
script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
if (go->dnsaddr[1] != 0)
script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
}
/* set tcp compression */
if (sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex) != 1) {
ipcp_close(f->unit, "Could not enable VJ TCP header compression");
return;
}
/*
* 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.
*/
if (demand) {
if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
if (go->ouraddr != wo->ouraddr) {
warn("Local IP address changed to %I", go->ouraddr);
script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
wo->ouraddr = go->ouraddr;
} else
script_unsetenv("OLDIPLOCAL");
if (ho->hisaddr != wo->hisaddr) {
warn("Remote IP address changed to %I", ho->hisaddr);
script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0);
wo->hisaddr = ho->hisaddr;
} else
script_unsetenv("OLDIPREMOTE");
/* Set the interface to the new addresses */
mask = GetMask(go->ouraddr);
if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
warn("Interface configuration failed");
ipcp_close(f->unit, "Interface configuration failed");
return;
}
/* assign a default route through the interface if required */
if (wo->default_route)
if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
default_route_set[f->unit] = 1;
/* Make a proxy ARP entry if requested. */
if (wo->proxy_arp &&
sifproxyarp(f->unit, ho->hisaddr, proxy_arp_quiet[f->unit]))
proxy_arp_set[f->unit] = 1;
}
demand_rexmit(PPP_IP);
if (sifnpmode(f->unit, PPP_IP, NPMODE_PASS) != 1) {
ipcp_close(f->unit, "Interface configuration failed.");
return;
}
} else {
/*
* Set IP addresses and (if specified) netmask.
*/
mask = GetMask(go->ouraddr);
#if SIFUPFIRST
/* bring the interface up for IP */
if (!sifup(f->unit)) {
warn("Interface failed to come up");
ipcp_close(f->unit, "Interface configuration failed");
return;
}
#endif
if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
warn("Interface configuration failed");
ipcp_close(f->unit, "Interface configuration failed");
return;
}
#if !SIFUPFIRST
/* bring the interface up for IP */
if (!sifup(f->unit)) {
warn("Interface failed to come up");
ipcp_close(f->unit, "Interface configuration failed");
return;
}
#endif
if (sifnpmode(f->unit, PPP_IP, NPMODE_PASS) != 1) {
ipcp_close(f->unit, "Interface configuration failed.");
return;
}
/* assign a default route through the interface if required */
if (wo->default_route)
if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
default_route_set[f->unit] = 1;
/* Make a proxy ARP entry if requested. */
if (wo->proxy_arp &&
sifproxyarp(f->unit, ho->hisaddr, proxy_arp_quiet[f->unit]))
proxy_arp_set[f->unit] = 1;
wo->ouraddr = go->ouraddr;
notice("local IP address %I", go->ouraddr);
notice("remote IP address %I", ho->hisaddr);
if (go->dnsaddr[0] != 0)
notice("primary DNS address %I", go->dnsaddr[0]);
if (go->dnsaddr[1] != 0)
notice("secondary DNS address %I", go->dnsaddr[1]);
}
np_up(f->unit, PPP_IP);
ipcp_is_up[f->unit] = 1;
if (ip_up_hook != NULL)
(*ip_up_hook)();
/*
* Execute the ip-up script, like this:
* /etc/ppp/ip-up interface tty speed local-IP remote-IP
*/
if (ipcp_script_state == s_down && ipcp_script_pid == 0) {
ipcp_script_state = s_up;
ipcp_script(_PATH_IPUP);
}
sys_unblock_proto(PPP_IP);
}
/*
* 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(("ipcp: down"));
/* XXX a bit IPv4-centric here, we only need to get the stats
* before the interface is marked down. */
update_link_stats(f->unit);
if (ip_down_hook != NULL)
(*ip_down_hook)();
if (ipcp_is_up[f->unit]) {
ipcp_is_up[f->unit] = 0;
np_down(f->unit, PPP_IP);
}
if (sifvjcomp(f->unit, 0, 0, 0) != 1) {
if (debug)
warn("Failed to disable VJ TCP header compression.");
}
/*
* If we are doing dial-on-demand, set the interface
* to queue up outgoing packets (for now).
*/
if (demand) {
if (sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE) != 1) {
if (debug)
warn("Failed to enable Queueing on outgoing packets.");
}
} else {
if (sifnpmode(f->unit, PPP_IP, NPMODE_ERROR) != 1) {
if (debug)
warn("Could not set interface to drop packets.");
}
if (sifdown(f->unit) != 1)
warn("Could not bring interface down.");
ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
ipcp_hisoptions[f->unit].hisaddr);
}
/* Execute the ip-down script */
if (ipcp_script_state == s_up && ipcp_script_pid == 0) {
ipcp_script_state = s_down;
ipcp_script(_PATH_IPDOWN);
}
}
/*
* ipcp_clear_addrs() - clear the interface addresses, routes,
* proxy arp entries, etc.
*/
static void
ipcp_clear_addrs(unit, ouraddr, hisaddr)
int unit;
u_int32_t ouraddr; /* local address */
u_int32_t hisaddr; /* remote address */
{
if (proxy_arp_set[unit]) {
(void) cifproxyarp(unit, hisaddr);
proxy_arp_set[unit] = 0;
}
if (default_route_set[unit]) {
(void) cifdefaultroute(unit, ouraddr, hisaddr);
default_route_set[unit] = 0;
}
if (cifaddr(unit, ouraddr, hisaddr) != 1)
warn("Could not clear addresses");
}
/*
* ipcp_finished - possibly shut down the lower layers.
*/
static void
ipcp_finished(f)
fsm *f;
{
np_finished(f->unit, PPP_IP);
}
/*
* ipcp_script_done - called when the ip-up or ip-down script
* has finished.
*/
/*ARGSUSED*/
static void
ipcp_script_done(arg, status)
void *arg;
int status;
{
ipcp_script_pid = 0;
switch (ipcp_script_state) {
case s_up:
if (ipcp_fsm[0].state != OPENED) {
ipcp_script_state = s_down;
ipcp_script(_PATH_IPDOWN);
}
break;
case s_down:
if (ipcp_fsm[0].state == OPENED) {
ipcp_script_state = s_up;
ipcp_script(_PATH_IPUP);
}
break;
}
}
/*
* ipcp_script - Execute a script with arguments
* interface-name tty-name speed local-IP remote-IP.
*/
static void
ipcp_script(script)
char *script;
{
char strspeed[32], strlocal[32], strremote[32];
char *argv[8];
(void) slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
(void) slprintf(strlocal, sizeof(strlocal), "%I",
ipcp_gotoptions[0].ouraddr);
(void) slprintf(strremote, sizeof(strremote), "%I",
ipcp_hisoptions[0].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;
ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, NULL);
}
/*
* create_resolv - create the replacement resolv.conf file
*/
static void
create_resolv(peerdns1, peerdns2)
u_int32_t peerdns1, peerdns2;
{
FILE *f;
f = fopen(_PATH_RESOLV, "w");
if (f == NULL) {
error("Failed to create %s: %m", _PATH_RESOLV);
return;
}
if (peerdns1)
if (fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1)) <= 0)
error("Write failed to %s: %m", _PATH_RESOLV);
if (peerdns2)
if (fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2)) <= 0)
error("Write failed to %s: %m", _PATH_RESOLV);
if (fclose(f) != 0)
error("Failed to close %s: %m", _PATH_RESOLV);
}
/*
* ipcp_printpkt - print the contents of an IPCP packet.
*/
static int
ipcp_printpkt(p, plen, printer, arg)
u_char *p;
int plen;
void (*printer) __P((void *, const 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;
printer(arg, " %s id=0x%x", code_name(code, 1), id);
len -= HEADERLEN;
switch (code) {
case CODE_CONFREQ:
case CODE_CONFACK:
case CODE_CONFNAK:
case CODE_CONFREJ:
/* print option list */
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;
GETNLONG(cilong, p);
printer(arg, "addrs %I", cilong);
GETNLONG(cilong, p);
printer(arg, " %I", 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;
GETNLONG(cilong, p);
printer(arg, "addr %I", cilong);
}
break;
case CI_MS_DNS1:
case CI_MS_DNS2:
p += 2;
GETNLONG(cilong, p);
printer(arg, "ms-dns%d %I", (code == CI_MS_DNS1 ? 1 : 2),
cilong);
break;
case CI_MS_WINS1:
case CI_MS_WINS2:
p += 2;
GETNLONG(cilong, p);
printer(arg, "ms-wins%d %I", (code == CI_MS_WINS1 ? 1 : 2),
cilong);
break;
case CI_SUBNET:
p += 2;
GETNLONG(cilong, p);
printer(arg, "subnet %I", cilong);
break;
}
while (p < optend) {
GETCHAR(code, p);
printer(arg, " %.2x", code);
}
printer(arg, ">");
}
break;
case CODE_TERMACK:
case CODE_TERMREQ:
if (len > 0 && *p >= ' ' && *p < 0x7f) {
printer(arg, " ");
print_string((char *)p, len, printer, arg);
p += len;
len = 0;
}
break;
}
/* print the rest of the bytes in the packet */
for (; len > 0; --len) {
GETCHAR(code, p);
printer(arg, " %.2x", code);
}
return p - pstart;
}
char *
tcp_flag_decode(val)
int val;
{
static char buf[32];
char *cp = buf;
if (val & TH_URG)
*cp++ = 'U';
if (val & TH_ACK)
*cp++ = 'A';
if (val & TH_PUSH)
*cp++ = 'P';
if (val & TH_RST)
*cp++ = 'R';
if (val & TH_SYN)
*cp++ = 'S';
if (val & TH_FIN)
*cp++ = 'F';
if (cp != buf)
*cp++ = ' ';
*cp = '\0';
return buf;
}
/*
* 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.
*/
static int
ip_active_pkt(pkt, len)
u_char *pkt;
int len;
{
u_char *tcp;
struct protoent *pep;
int val;
int hlen;
char buf[32], *cp;
u_int32_t src, dst;
len -= PPP_HDRLEN;
pkt += PPP_HDRLEN;
if (len < IP_HDRLEN) {
dbglog("IP packet of length %d is not activity", len);
return 0;
}
src = get_ipsrc(pkt);
dst = get_ipdst(pkt);
if ((get_ipoff(pkt) & IP_OFFMASK) != 0) {
dbglog("IP fragment from %I->%I is not activity", src, dst);
return 0;
}
val = get_ipproto(pkt);
if (val != IPPROTO_TCP) {
if (debug) {
if ((pep = getprotobynumber(val)) != NULL) {
cp = pep->p_name;
} else {
(void) slprintf(buf, sizeof (buf), "IP proto %d", val);
cp = buf;
}
info("%s from %I->%I is activity", cp, src, dst);
}
return 1;
}
hlen = get_iphl(pkt) * 4;
if (len < hlen + TCP_HDRLEN) {
dbglog("Bad TCP length %d<%d+%d %I->%I is not activity", len, hlen,
TCP_HDRLEN, src, dst);
return 0;
}
tcp = pkt + hlen;
val = get_tcpflags(tcp);
hlen += get_tcpoff(tcp) * 4;
if ((val & TH_FIN) != 0 && len == hlen) {
dbglog("Empty TCP FIN %I->%I is not activity", src, dst);
return 0;
}
info("TCP %d data %s%I->%I is activity", len - hlen,
tcp_flag_decode(get_tcpflags(tcp)), src, dst);
return 1;
}
static void
ipcp_print_stat(unit, strptr)
int unit;
FILE *strptr;
{
ipcp_options *go = &ipcp_gotoptions[unit];
ipcp_options *ho = &ipcp_hisoptions[unit];
char *proto_name = ipcp_protent.name;
if (!ipcp_protent.enabled_flag) {
(void) flprintf(strptr, "%s disabled\n", proto_name);
return;
}
(void) flprintf(strptr, "%s state: %s", proto_name,
fsm_state(ipcp_fsm[unit].state));
(void) flprintf(strptr, "%s local %I remote %I", proto_name, go->ouraddr,
ho->ouraddr);
}