/*
* ipcp.c - PPP IP Control Protocol.
*
* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define RCSID "$Id: ipcp.c,v 1.73 2008/05/26 08:33:22 paulus Exp $"
/*
* TODO:
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "pppd.h"
#include "fsm.h"
#include "ipcp.h"
#include "pathnames.h"
static const char rcsid[] = RCSID;
/* 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 */
u_int32_t netmask = 0; /* IP netmask to set on interface */
bool disable_defaultip = 0; /* Don't use hostname for default IP adrs */
bool noremoteip = 0; /* Let him have no IP address */
/* 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;
/* Hook for a plugin to choose the remote IP address */
void (*ip_choose_hook) __P((u_int32_t *)) = NULL;
/* Notifiers for when IPCP goes up and down */
struct notifier *ip_up_notifier = NULL;
struct notifier *ip_down_notifier = NULL;
/* local vars */
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 */
static bool usepeerdns; /* Ask peer for DNS addrs */
static int ipcp_is_up; /* have called np_up() */
static int ipcp_is_open; /* haven't called np_finished() */
static bool ask_for_local; /* request our address from peer */
static char vj_value[8]; /* string form of vj option value */
static char netmask_str[20]; /* string form of netmask value */
/*
* 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, 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 */
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 */
};
/*
* Command-line options.
*/
static int setvjslots __P((char **));
static int setdnsaddr __P((char **));
static int setwinsaddr __P((char **));
static int setnetmask __P((char **));
int setipaddr __P((char *, char **, int));
static void printipaddr __P((option_t *, void (*)(void *, char *,...),void *));
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", OPT_ALIAS },
{ "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
"Disable VJ compression", OPT_A2CLR, &ipcp_allowoptions[0].neg_vj },
{ "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
"Disable VJ compression", OPT_ALIAS | OPT_A2CLR,
&ipcp_allowoptions[0].neg_vj },
{ "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
"Disable VJ connection-ID compression", OPT_A2CLR,
&ipcp_allowoptions[0].cflag },
{ "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
"Disable VJ connection-ID compression", OPT_ALIAS | OPT_A2CLR,
&ipcp_allowoptions[0].cflag },
{ "vj-max-slots", o_special, (void *)setvjslots,
"Set maximum VJ header slots",
OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, vj_value },
{ "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", OPT_PRIO },
{ "noipdefault", o_bool, &disable_defaultip,
"Don't use name for default IP adrs", 1 },
{ "ms-dns", 1, (void *)setdnsaddr,
"DNS address for the peer's use" },
{ "ms-wins", 1, (void *)setwinsaddr,
"Nameserver for SMB over TCP/IP for peer" },
{ "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
"Set timeout for IPCP", OPT_PRIO },
{ "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
"Set max #xmits for term-reqs", OPT_PRIO },
{ "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
"Set max #xmits for conf-reqs", OPT_PRIO },
{ "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
"Set max #conf-naks for IPCP", OPT_PRIO },
{ "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_A2CLR,
&ipcp_wantoptions[0].default_route },
{ "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
"disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
&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 },
{ "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
"disable proxyarp option", OPT_A2CLR,
&ipcp_wantoptions[0].proxy_arp },
{ "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
"disable proxyarp option", OPT_ALIAS | OPT_A2CLR,
&ipcp_wantoptions[0].proxy_arp },
{ "usepeerdns", o_bool, &usepeerdns,
"Ask peer for DNS address(es)", 1 },
{ "netmask", o_special, (void *)setnetmask,
"set netmask", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, netmask_str },
{ "ipcp-no-addresses", o_bool, &ipcp_wantoptions[0].old_addrs,
"Disable old-style IP-Addresses usage", OPT_A2CLR,
&ipcp_allowoptions[0].old_addrs },
{ "ipcp-no-address", o_bool, &ipcp_wantoptions[0].neg_addr,
"Disable IP-Address usage", OPT_A2CLR,
&ipcp_allowoptions[0].neg_addr },
#ifdef __linux__
{ "noremoteip", o_bool, &noremoteip,
"Allow peer to have no IP address", 1 },
#endif
{ "nosendip", o_bool, &ipcp_wantoptions[0].neg_addr,
"Don't send our IP address to peer", OPT_A2CLR,
&ipcp_wantoptions[0].old_addrs},
{ "IP addresses", o_wild, (void *) &setipaddr,
"set local and remote IP addresses",
OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr },
{ 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 *, 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 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
};
static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t));
static void ipcp_script __P((char *, int)); /* Run an up/down script */
static void ipcp_script_done __P((void *));
/*
* 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")
/*
* 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];
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;
slprintf(vj_value, sizeof(vj_value), "%d", value);
return 1;
}
/*
* setdnsaddr - set the dns address(es)
*/
static int
setdnsaddr(argv)
char **argv;
{
u_int32_t dns;
struct hostent *hp;
dns = inet_addr(*argv);
if (dns == (u_int32_t) -1) {
if ((hp = gethostbyname(*argv)) == NULL) {
option_error("invalid address parameter '%s' for ms-dns option",
*argv);
return 0;
}
dns = *(u_int32_t *)hp->h_addr;
}
/* We take the last 2 values given, the 2nd-last as the primary
and the last as the secondary. If only one is given it
becomes both primary and secondary. */
if (ipcp_allowoptions[0].dnsaddr[1] == 0)
ipcp_allowoptions[0].dnsaddr[0] = dns;
else
ipcp_allowoptions[0].dnsaddr[0] = ipcp_allowoptions[0].dnsaddr[1];
/* always set the secondary address value. */
ipcp_allowoptions[0].dnsaddr[1] = dns;
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;
{
u_int32_t wins;
struct hostent *hp;
wins = inet_addr(*argv);
if (wins == (u_int32_t) -1) {
if ((hp = gethostbyname(*argv)) == NULL) {
option_error("invalid address parameter '%s' for ms-wins option",
*argv);
return 0;
}
wins = *(u_int32_t *)hp->h_addr;
}
/* We take the last 2 values given, the 2nd-last as the primary
and the last as the secondary. If only one is given it
becomes both primary and secondary. */
if (ipcp_allowoptions[0].winsaddr[1] == 0)
ipcp_allowoptions[0].winsaddr[0] = wins;
else
ipcp_allowoptions[0].winsaddr[0] = ipcp_allowoptions[0].winsaddr[1];
/* always set the secondary address value. */
ipcp_allowoptions[0].winsaddr[1] = wins;
return (1);
}
/*
* setipaddr - Set the IP address
* If doit is 0, the call is to check whether this option is
* potentially an IP address specification.
* Not static so that plugins can call it to set the addresses
*/
int
setipaddr(arg, argv, doit)
char *arg;
char **argv;
int doit;
{
struct hostent *hp;
char *colon;
u_int32_t local, remote;
ipcp_options *wo = &ipcp_wantoptions[0];
static int prio_local = 0, prio_remote = 0;
/*
* IP address pair separated by ":".
*/
if ((colon = strchr(arg, ':')) == NULL)
return 0;
if (!doit)
return 1;
/*
* If colon first character, then no local addr.
*/
if (colon != arg && option_priority >= prio_local) {
*colon = '\0';
if ((local = inet_addr(arg)) == (u_int32_t) -1) {
if ((hp = gethostbyname(arg)) == NULL) {
option_error("unknown host: %s", arg);
return 0;
}
local = *(u_int32_t *)hp->h_addr;
}
if (bad_ip_adrs(local)) {
option_error("bad local IP address %s", ip_ntoa(local));
return 0;
}
if (local != 0)
wo->ouraddr = local;
*colon = ':';
prio_local = option_priority;
}
/*
* If colon last character, then no remote addr.
*/
if (*++colon != '\0' && option_priority >= prio_remote) {
if ((remote = inet_addr(colon)) == (u_int32_t) -1) {
if ((hp = gethostbyname(colon)) == NULL) {
option_error("unknown host: %s", colon);
return 0;
}
remote = *(u_int32_t *)hp->h_addr;
if (remote_name[0] == 0)
strlcpy(remote_name, colon, sizeof(remote_name));
}
if (bad_ip_adrs(remote)) {
option_error("bad remote IP address %s", ip_ntoa(remote));
return 0;
}
if (remote != 0)
wo->hisaddr = remote;
prio_remote = option_priority;
}
return 1;
}
static void
printipaddr(opt, printer, arg)
option_t *opt;
void (*printer) __P((void *, char *, ...));
void *arg;
{
ipcp_options *wo = &ipcp_wantoptions[0];
if (wo->ouraddr != 0)
printer(arg, "%I", wo->ouraddr);
printer(arg, ":");
if (wo->hisaddr != 0)
printer(arg, "%I", wo->hisaddr);
}
/*
* setnetmask - set the netmask to be used on the interface.
*/
static int
setnetmask(argv)
char **argv;
{
u_int32_t mask;
int n;
char *p;
/*
* Unfortunately, if we use inet_addr, we can't tell whether
* a result of all 1s is an error or a valid 255.255.255.255.
*/
p = *argv;
n = parse_dotted_ip(p, &mask);
mask = htonl(mask);
if (n == 0 || p[n] != 0 || (netmask & ~mask) != 0) {
option_error("invalid netmask value '%s'", *argv);
return 0;
}
netmask = mask;
slprintf(netmask_str, sizeof(netmask_str), "%I", mask);
return (1);
}
int
parse_dotted_ip(p, vp)
char *p;
u_int32_t *vp;
{
int n;
u_int32_t v, b;
char *endp, *p0 = p;
v = 0;
for (n = 3;; --n) {
b = strtoul(p, &endp, 0);
if (endp == p)
return 0;
if (b > 255) {
if (n < 3)
return 0;
/* accept e.g. 0xffffff00 */
*vp = b;
return endp - p0;
}
v |= b << (n * 8);
p = endp;
if (n == 0)
break;
if (*p != '.')
return 0;
++p;
}
*vp = v;
return p - p0;
}
/*
* 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]);
/*
* Some 3G modems use repeated IPCP NAKs as a way of stalling
* until they can contact a server on the network, so we increase
* the default number of NAKs we accept before we start treating
* them as rejects.
*/
f->maxnakloops = 100;
memset(wo, 0, sizeof(*wo));
memset(ao, 0, 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;
/* 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 = ao->old_addrs = 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_is_open = 1;
}
/*
* 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.
* 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)
wo->accept_local = 1;
if (wo->hisaddr == 0)
wo->accept_remote = 1;
wo->req_dns1 = usepeerdns; /* Request DNS addresses from the peer */
wo->req_dns2 = usepeerdns;
*go = *wo;
if (!ask_for_local)
go->ouraddr = 0;
if (ip_choose_hook) {
ip_choose_hook(&wo->hisaddr);
if (wo->hisaddr) {
wo->accept_remote = 0;
}
}
BZERO(&ipcp_hisoptions[f->unit], sizeof(ipcp_options));
}
/*
* 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)
#define LENCIDNS(neg) LENCIADDR(neg)
#define LENCIWINS(neg) LENCIADDR(neg)
/*
* 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)
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) +
LENCIDNS(go->req_dns1) +
LENCIDNS(go->req_dns2) +
LENCIWINS(go->winsaddr[0]) +
LENCIWINS(go->winsaddr[1])) ;
}
/*
* 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) { \
u_int32_t l; \
PUTCHAR(opt, ucp); \
PUTCHAR(CILEN_ADDRS, ucp); \
l = ntohl(val1); \
PUTLONG(l, ucp); \
l = ntohl(val2); \
PUTLONG(l, 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) { \
u_int32_t l; \
PUTCHAR(opt, ucp); \
PUTCHAR(CILEN_ADDR, ucp); \
l = ntohl(val); \
PUTLONG(l, ucp); \
len -= CILEN_ADDR; \
} else \
neg = 0; \
}
#define ADDCIDNS(opt, neg, addr) \
if (neg) { \
if (len >= CILEN_ADDR) { \
u_int32_t l; \
PUTCHAR(opt, ucp); \
PUTCHAR(CILEN_ADDR, ucp); \
l = ntohl(addr); \
PUTLONG(l, ucp); \
len -= CILEN_ADDR; \
} else \
neg = 0; \
}
#define ADDCIWINS(opt, addr) \
if (addr) { \
if (len >= CILEN_ADDR) { \
u_int32_t l; \
PUTCHAR(opt, ucp); \
PUTCHAR(CILEN_ADDR, ucp); \
l = ntohl(addr); \
PUTLONG(l, ucp); \
len -= CILEN_ADDR; \
} else \
addr = 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);
ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
ADDCIWINS(CI_MS_WINS1, go->winsaddr[0]);
ADDCIWINS(CI_MS_WINS2, go->winsaddr[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 ACKCIADDRS(opt, neg, val1, val2) \
if (neg) { \
u_int32_t l; \
if ((len -= CILEN_ADDRS) < 0) \
goto bad; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_ADDRS || \
citype != opt) \
goto bad; \
GETLONG(l, p); \
cilong = htonl(l); \
if (val1 != cilong) \
goto bad; \
GETLONG(l, p); \
cilong = htonl(l); \
if (val2 != cilong) \
goto 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, val) \
if (neg) { \
u_int32_t l; \
if ((len -= CILEN_ADDR) < 0) \
goto bad; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_ADDR || \
citype != opt) \
goto bad; \
GETLONG(l, p); \
cilong = htonl(l); \
if (val != cilong) \
goto bad; \
}
#define ACKCIDNS(opt, neg, addr) \
if (neg) { \
u_int32_t l; \
if ((len -= CILEN_ADDR) < 0) \
goto bad; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_ADDR || citype != opt) \
goto bad; \
GETLONG(l, p); \
cilong = htonl(l); \
if (addr != cilong) \
goto bad; \
}
#define ACKCIWINS(opt, addr) \
if (addr) { \
u_int32_t l; \
if ((len -= CILEN_ADDR) < 0) \
goto bad; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_ADDR || citype != opt) \
goto bad; \
GETLONG(l, p); \
cilong = htonl(l); \
if (addr != 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);
ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
ACKCIWINS(CI_MS_WINS1, go->winsaddr[0]);
ACKCIWINS(CI_MS_WINS2, go->winsaddr[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, treat_as_reject)
fsm *f;
u_char *p;
int len;
int treat_as_reject;
{
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, cidnsaddr;
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); \
GETLONG(l, p); \
ciaddr1 = htonl(l); \
GETLONG(l, p); \
ciaddr2 = htonl(l); \
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); \
GETLONG(l, p); \
ciaddr1 = htonl(l); \
no.neg = 1; \
code \
}
#define NAKCIDNS(opt, neg, code) \
if (go->neg && \
((cilen = p[1]) == CILEN_ADDR) && \
len >= cilen && \
p[0] == opt) { \
len -= cilen; \
INCPTR(2, p); \
GETLONG(l, p); \
cidnsaddr = htonl(l); \
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 (treat_as_reject) {
try.old_addrs = 0;
} else {
if (go->accept_local && ciaddr1) {
/* take his idea of our address */
try.ouraddr = ciaddr1;
}
if (go->accept_remote && ciaddr2) {
/* take his idea of his address */
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 (treat_as_reject) {
try.neg_vj = 0;
} else 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 (treat_as_reject) {
try.neg_addr = 0;
try.old_addrs = 0;
} else if (go->accept_local && ciaddr1) {
/* take his idea of our address */
try.ouraddr = ciaddr1;
}
);
NAKCIDNS(CI_MS_DNS1, req_dns1,
if (treat_as_reject) {
try.req_dns1 = 0;
} else {
try.dnsaddr[0] = cidnsaddr;
}
);
NAKCIDNS(CI_MS_DNS2, req_dns2,
if (treat_as_reject) {
try.req_dns2 = 0;
} else {
try.dnsaddr[1] = cidnsaddr;
}
);
/*
* 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.
* If they want us to ask for ms-dns, we do that, since some
* peers get huffy if we don't.
*/
while (len >= CILEN_VOID) {
GETCHAR(citype, p);
GETCHAR(cilen, p);
if ( cilen < CILEN_VOID || (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 = 0;
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;
case CI_MS_DNS1:
if (go->req_dns1 || no.req_dns1 || cilen != CILEN_ADDR)
goto bad;
GETLONG(l, p);
try.dnsaddr[0] = htonl(l);
try.req_dns1 = 1;
no.req_dns1 = 1;
break;
case CI_MS_DNS2:
if (go->req_dns2 || no.req_dns2 || cilen != CILEN_ADDR)
goto bad;
GETLONG(l, p);
try.dnsaddr[1] = htonl(l);
try.req_dns2 = 1;
no.req_dns2 = 1;
break;
case CI_MS_WINS1:
case CI_MS_WINS2:
if (cilen != CILEN_ADDR)
goto bad;
GETLONG(l, p);
ciaddr1 = htonl(l);
if (ciaddr1)
try.winsaddr[citype == CI_MS_WINS2] = ciaddr1;
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) { \
u_int32_t l; \
len -= cilen; \
INCPTR(2, p); \
GETLONG(l, p); \
cilong = htonl(l); \
/* Check rejected value. */ \
if (cilong != val1) \
goto bad; \
GETLONG(l, p); \
cilong = htonl(l); \
/* 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, val) \
if (go->neg && \
(cilen = p[1]) == CILEN_ADDR && \
len >= cilen && \
p[0] == opt) { \
u_int32_t l; \
len -= cilen; \
INCPTR(2, p); \
GETLONG(l, p); \
cilong = htonl(l); \
/* Check rejected value. */ \
if (cilong != val) \
goto bad; \
try.neg = 0; \
}
#define REJCIDNS(opt, neg, dnsaddr) \
if (go->neg && \
((cilen = p[1]) == CILEN_ADDR) && \
len >= cilen && \
p[0] == opt) { \
u_int32_t l; \
len -= cilen; \
INCPTR(2, p); \
GETLONG(l, p); \
cilong = htonl(l); \
/* Check rejected value. */ \
if (cilong != dnsaddr) \
goto bad; \
try.neg = 0; \
}
#define REJCIWINS(opt, addr) \
if (addr && \
((cilen = p[1]) == CILEN_ADDR) && \
len >= cilen && \
p[0] == opt) { \
u_int32_t l; \
len -= cilen; \
INCPTR(2, p); \
GETLONG(l, p); \
cilong = htonl(l); \
/* Check rejected value. */ \
if (cilong != addr) \
goto bad; \
try.winsaddr[opt == CI_MS_WINS2] = 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);
REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
REJCIWINS(CI_MS_WINS1, go->winsaddr[0]);
REJCIWINS(CI_MS_WINS2, go->winsaddr[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: 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];
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;
/*
* 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(("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:
if (!ao->old_addrs || ho->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);
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);
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 {
wo->ouraddr = ciaddr2; /* accept peer's idea */
}
}
ho->old_addrs = 1;
ho->hisaddr = ciaddr1;
ho->ouraddr = ciaddr2;
break;
case CI_ADDR:
if (!ao->neg_addr || ho->old_addrs ||
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);
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;
/* 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;
/* 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:
if (!ao->neg_vj ||
(cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
orc = CONFREJ;
break;
}
GETSHORT(cishort, p);
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:
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 && !ho->old_addrs &&
wo->req_addr && !reject_if_disagree && !noremoteip) {
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(("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;
}
}
ask_for_local = wo->ouraddr != 0 || !disable_defaultip;
}
/*
* 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 && !noremoteip) {
/* 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;
ask_for_local = 0; /* don't tell the peer this address */
}
if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
return 0;
ipcp_script(_PATH_IPPREUP, 1);
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;
notice("local IP address %I", wo->ouraddr);
if (wo->hisaddr)
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->neg_addr && !ho->old_addrs)
ho->hisaddr = wo->hisaddr;
if (!(go->neg_addr || go->old_addrs) && (wo->neg_addr || wo->old_addrs)
&& wo->ouraddr != 0) {
error("Peer refused to agree to our IP address");
ipcp_close(f->unit, "Refused our 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;
}
if (ho->hisaddr == 0 && !noremoteip) {
ho->hisaddr = htonl(0x0a404040 + ifunit);
warn("Could not determine remote IP address: defaulting to %I",
ho->hisaddr);
}
script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
if (ho->hisaddr != 0)
script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
if (!go->req_dns1)
go->dnsaddr[0] = 0;
if (!go->req_dns2)
go->dnsaddr[1] = 0;
if (go->dnsaddr[0])
script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
if (go->dnsaddr[1])
script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
script_setenv("USEPEERDNS", "1", 0);
create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
}
/*
* Check that the peer is allowed to use the IP address it wants.
*/
if (ho->hisaddr != 0 && !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;
}
/* 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.
*/
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 && wo->hisaddr != 0) {
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)) {
if (debug)
warn("Interface configuration failed");
ipcp_close(f->unit, "Interface configuration failed");
return;
}
/* 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 (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
if (sifproxyarp(f->unit, ho->hisaddr))
proxy_arp_set[f->unit] = 1;
}
demand_rexmit(PPP_IP);
sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
} else {
/*
* 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)) {
if (debug)
warn("Interface configuration failed");
ipcp_close(f->unit, "Interface configuration failed");
return;
}
#endif
/* run the pre-up script, if any, and wait for it to finish */
ipcp_script(_PATH_IPPREUP, 1);
/* bring the interface up for IP */
if (!sifup(f->unit)) {
if (debug)
warn("Interface failed to come up");
ipcp_close(f->unit, "Interface configuration failed");
return;
}
#if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
if (debug)
warn("Interface configuration 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 (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
if (sifproxyarp(f->unit, ho->hisaddr))
proxy_arp_set[f->unit] = 1;
ipcp_wantoptions[0].ouraddr = go->ouraddr;
notice("local IP address %I", go->ouraddr);
if (ho->hisaddr != 0)
notice("remote IP address %I", ho->hisaddr);
if (go->dnsaddr[0])
notice("primary DNS address %I", go->dnsaddr[0]);
if (go->dnsaddr[1])
notice("secondary DNS address %I", go->dnsaddr[1]);
}
reset_link_stats(f->unit);
np_up(f->unit, PPP_IP);
ipcp_is_up = 1;
notify(ip_up_notifier, 0);
if (ip_up_hook)
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, 0);
}
}
/*
* 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. */
/* XXX more correct: we must get the stats before running the notifiers,
* at least for the radius plugin */
update_link_stats(f->unit);
notify(ip_down_notifier, 0);
if (ip_down_hook)
ip_down_hook();
if (ipcp_is_up) {
ipcp_is_up = 0;
np_down(f->unit, PPP_IP);
}
sifvjcomp(f->unit, 0, 0, 0);
print_link_stats(); /* _after_ running the notifiers and ip_down_hook(),
* because print_link_stats() sets link_stats_valid
* to 0 (zero) */
/*
* If we are doing dial-on-demand, set the interface
* to queue up outgoing packets (for now).
*/
if (demand) {
sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
} else {
sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
sifdown(f->unit);
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, 0);
}
}
/*
* 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]) {
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;
{
if (ipcp_is_open) {
ipcp_is_open = 0;
np_finished(f->unit, PPP_IP);
}
}
/*
* ipcp_script_done - called when the ip-up or ip-down script
* has finished.
*/
static void
ipcp_script_done(arg)
void *arg;
{
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, 0);
}
break;
case s_down:
if (ipcp_fsm[0].state == OPENED) {
ipcp_script_state = s_up;
ipcp_script(_PATH_IPUP, 0);
}
break;
}
}
/*
* ipcp_script - Execute a script with arguments
* interface-name tty-name speed local-IP remote-IP.
*/
static void
ipcp_script(script, wait)
char *script;
int wait;
{
char strspeed[32], strlocal[32], strremote[32];
char *argv[8];
slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr);
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;
if (wait)
run_program(script, argv, 0, NULL, NULL, 1);
else
ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done,
NULL, 0);
}
/*
* create_resolv - create the replacement resolv.conf file
*/
static void
create_resolv(peerdns1, peerdns2)
u_int32_t peerdns1, peerdns2;
{
#if !defined(__ANDROID__)
FILE *f;
f = fopen(_PATH_RESOLV, "w");
if (f == NULL) {
error("Failed to create %s: %m", _PATH_RESOLV);
return;
}
if (peerdns1)
fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1));
if (peerdns2)
fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2));
if (ferror(f))
error("Write failed to %s: %m", _PATH_RESOLV);
fclose(f);
#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:
/* 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;
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%d %I", (code == CI_MS_DNS1? 1: 2),
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((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;
}
/*
* 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
#ifndef IPPROTO_TCP
#define IPPROTO_TCP 6
#endif
#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;
}