/*
* ipxcp.c - PPP IPX Control Protocol.
*
* Copyright (c) 1989 Carnegie Mellon University.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Carnegie Mellon University. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifdef IPX_CHANGE
#define RCSID "$Id$"
/*
* TODO:
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "pppd.h"
#include "fsm.h"
#include "ipxcp.h"
#include "pathnames.h"
#include "magic.h"
static const char rcsid[] = RCSID;
/* global vars */
ipxcp_options ipxcp_wantoptions[NUM_PPP]; /* Options that we want to request */
ipxcp_options ipxcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
ipxcp_options ipxcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
ipxcp_options ipxcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
#define wo (&ipxcp_wantoptions[0])
#define ao (&ipxcp_allowoptions[0])
#define go (&ipxcp_gotoptions[0])
#define ho (&ipxcp_hisoptions[0])
/*
* Callbacks for fsm code. (CI = Configuration Information)
*/
static void ipxcp_resetci __P((fsm *)); /* Reset our CI */
static int ipxcp_cilen __P((fsm *)); /* Return length of our CI */
static void ipxcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
static int ipxcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
static int ipxcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */
static int ipxcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
static int ipxcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
static void ipxcp_up __P((fsm *)); /* We're UP */
static void ipxcp_down __P((fsm *)); /* We're DOWN */
static void ipxcp_finished __P((fsm *)); /* Don't need lower layer */
fsm ipxcp_fsm[NUM_PPP]; /* IPXCP fsm structure */
static fsm_callbacks ipxcp_callbacks = { /* IPXCP callback routines */
ipxcp_resetci, /* Reset our Configuration Information */
ipxcp_cilen, /* Length of our Configuration Information */
ipxcp_addci, /* Add our Configuration Information */
ipxcp_ackci, /* ACK our Configuration Information */
ipxcp_nakci, /* NAK our Configuration Information */
ipxcp_rejci, /* Reject our Configuration Information */
ipxcp_reqci, /* Request peer's Configuration Information */
ipxcp_up, /* Called when fsm reaches OPENED state */
ipxcp_down, /* Called when fsm leaves OPENED state */
NULL, /* Called when we want the lower layer up */
ipxcp_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 */
"IPXCP" /* String name of protocol */
};
/*
* Command-line options.
*/
static int setipxnode __P((char **));
static int setipxname __P((char **));
static option_t ipxcp_option_list[] = {
{ "ipx", o_bool, &ipxcp_protent.enabled_flag,
"Enable IPXCP (and IPX)", 1 },
{ "+ipx", o_bool, &ipxcp_protent.enabled_flag,
"Enable IPXCP (and IPX)", 1 },
{ "noipx", o_bool, &ipxcp_protent.enabled_flag,
"Disable IPXCP (and IPX)" },
{ "-ipx", o_bool, &ipxcp_protent.enabled_flag,
"Disable IPXCP (and IPX)" } ,
{ "ipx-network", o_uint32, &ipxcp_wantoptions[0].our_network,
"Set our IPX network number", 0, &ipxcp_wantoptions[0].neg_nn },
{ "ipxcp-accept-network", o_bool, &ipxcp_wantoptions[0].accept_network,
"Accept peer IPX network number", 1,
&ipxcp_allowoptions[0].accept_network },
{ "ipx-node", o_special, setipxnode,
"Set IPX node number" },
{ "ipxcp-accept-local", o_bool, &ipxcp_wantoptions[0].accept_local,
"Accept our IPX address", 1,
&ipxcp_allowoptions[0].accept_local },
{ "ipxcp-accept-remote", o_bool, &ipxcp_wantoptions[0].accept_remote,
"Accept peer's IPX address", 1,
&ipxcp_allowoptions[0].accept_remote },
{ "ipx-routing", o_int, &ipxcp_wantoptions[0].router,
"Set IPX routing proto number", 0,
&ipxcp_wantoptions[0].neg_router },
{ "ipx-router-name", o_special, setipxname,
"Set IPX router name" },
{ "ipxcp-restart", o_int, &ipxcp_fsm[0].timeouttime,
"Set timeout for IPXCP" },
{ "ipxcp-max-terminate", o_int, &ipxcp_fsm[0].maxtermtransmits,
"Set max #xmits for IPXCP term-reqs" },
{ "ipxcp-max-configure", o_int, &ipxcp_fsm[0].maxconfreqtransmits,
"Set max #xmits for IPXCP conf-reqs" },
{ "ipxcp-max-failure", o_int, &ipxcp_fsm[0].maxnakloops,
"Set max #conf-naks for IPXCP" },
{ NULL }
};
/*
* Protocol entry points.
*/
static void ipxcp_init __P((int));
static void ipxcp_open __P((int));
static void ipxcp_close __P((int, char *));
static void ipxcp_lowerup __P((int));
static void ipxcp_lowerdown __P((int));
static void ipxcp_input __P((int, u_char *, int));
static void ipxcp_protrej __P((int));
static int ipxcp_printpkt __P((u_char *, int,
void (*) __P((void *, char *, ...)), void *));
struct protent ipxcp_protent = {
PPP_IPXCP,
ipxcp_init,
ipxcp_input,
ipxcp_protrej,
ipxcp_lowerup,
ipxcp_lowerdown,
ipxcp_open,
ipxcp_close,
ipxcp_printpkt,
NULL,
0,
"IPXCP",
"IPX",
ipxcp_option_list,
NULL,
NULL,
NULL
};
/*
* Lengths of configuration options.
*/
#define CILEN_VOID 2
#define CILEN_COMPLETE 2 /* length of complete option */
#define CILEN_NETN 6 /* network number length option */
#define CILEN_NODEN 8 /* node number length option */
#define CILEN_PROTOCOL 4 /* Minimum length of routing protocol */
#define CILEN_NAME 3 /* Minimum length of router name */
#define CILEN_COMPRESS 4 /* Minimum length of compression protocol */
#define CODENAME(x) ((x) == CONFACK ? "ACK" : \
(x) == CONFNAK ? "NAK" : "REJ")
static int ipxcp_is_up;
static char *ipx_ntoa __P((u_int32_t));
/* Used in printing the node number */
#define NODE(base) base[0], base[1], base[2], base[3], base[4], base[5]
/* Used to generate the proper bit mask */
#define BIT(num) (1 << (num))
/*
* Convert from internal to external notation
*/
static short int
to_external(internal)
short int internal;
{
short int external;
if (internal & BIT(IPX_NONE) )
external = IPX_NONE;
else
external = RIP_SAP;
return external;
}
/*
* Make a string representation of a network IP address.
*/
static char *
ipx_ntoa(ipxaddr)
u_int32_t ipxaddr;
{
static char b[64];
slprintf(b, sizeof(b), "%x", ipxaddr);
return b;
}
static u_char *
setipxnodevalue(src,dst)
u_char *src, *dst;
{
int indx;
int item;
for (;;) {
if (!isxdigit (*src))
break;
for (indx = 0; indx < 5; ++indx) {
dst[indx] <<= 4;
dst[indx] |= (dst[indx + 1] >> 4) & 0x0F;
}
item = toupper (*src) - '0';
if (item > 9)
item -= 7;
dst[5] = (dst[5] << 4) | item;
++src;
}
return src;
}
static int
setipxnode(argv)
char **argv;
{
char *end;
memset (&ipxcp_wantoptions[0].our_node[0], 0, 6);
memset (&ipxcp_wantoptions[0].his_node[0], 0, 6);
end = setipxnodevalue (*argv, &ipxcp_wantoptions[0].our_node[0]);
if (*end == ':')
end = setipxnodevalue (++end, &ipxcp_wantoptions[0].his_node[0]);
if (*end == '\0') {
ipxcp_wantoptions[0].neg_node = 1;
return 1;
}
option_error("invalid parameter '%s' for ipx-node option", *argv);
return 0;
}
static int
setipxname (argv)
char **argv;
{
char *dest = ipxcp_wantoptions[0].name;
char *src = *argv;
int count;
char ch;
ipxcp_wantoptions[0].neg_name = 1;
ipxcp_allowoptions[0].neg_name = 1;
memset (dest, '\0', sizeof (ipxcp_wantoptions[0].name));
count = 0;
while (*src) {
ch = *src++;
if (! isalnum (ch) && ch != '_') {
option_error("IPX router name must be alphanumeric or _");
return 0;
}
if (count >= sizeof (ipxcp_wantoptions[0].name)) {
option_error("IPX router name is limited to %d characters",
sizeof (ipxcp_wantoptions[0].name) - 1);
return 0;
}
dest[count++] = toupper (ch);
}
return 1;
}
/*
* ipxcp_init - Initialize IPXCP.
*/
static void
ipxcp_init(unit)
int unit;
{
fsm *f = &ipxcp_fsm[unit];
f->unit = unit;
f->protocol = PPP_IPXCP;
f->callbacks = &ipxcp_callbacks;
fsm_init(&ipxcp_fsm[unit]);
memset (wo->name, 0, sizeof (wo->name));
memset (wo->our_node, 0, sizeof (wo->our_node));
memset (wo->his_node, 0, sizeof (wo->his_node));
wo->neg_nn = 1;
wo->neg_complete = 1;
wo->network = 0;
ao->neg_node = 1;
ao->neg_nn = 1;
ao->neg_name = 1;
ao->neg_complete = 1;
ao->neg_router = 1;
ao->accept_local = 0;
ao->accept_remote = 0;
ao->accept_network = 0;
wo->tried_rip = 0;
wo->tried_nlsp = 0;
}
/*
* Copy the node number
*/
static void
copy_node (src, dst)
u_char *src, *dst;
{
memcpy (dst, src, sizeof (ipxcp_wantoptions[0].our_node));
}
/*
* Compare node numbers
*/
static int
compare_node (src, dst)
u_char *src, *dst;
{
return memcmp (dst, src, sizeof (ipxcp_wantoptions[0].our_node)) == 0;
}
/*
* Is the node number zero?
*/
static int
zero_node (node)
u_char *node;
{
int indx;
for (indx = 0; indx < sizeof (ipxcp_wantoptions[0].our_node); ++indx)
if (node [indx] != 0)
return 0;
return 1;
}
/*
* Increment the node number
*/
static void
inc_node (node)
u_char *node;
{
u_char *outp;
u_int32_t magic_num;
outp = node;
magic_num = magic();
*outp++ = '\0';
*outp++ = '\0';
PUTLONG (magic_num, outp);
}
/*
* ipxcp_open - IPXCP is allowed to come up.
*/
static void
ipxcp_open(unit)
int unit;
{
fsm_open(&ipxcp_fsm[unit]);
}
/*
* ipxcp_close - Take IPXCP down.
*/
static void
ipxcp_close(unit, reason)
int unit;
char *reason;
{
fsm_close(&ipxcp_fsm[unit], reason);
}
/*
* ipxcp_lowerup - The lower layer is up.
*/
static void
ipxcp_lowerup(unit)
int unit;
{
fsm_lowerup(&ipxcp_fsm[unit]);
}
/*
* ipxcp_lowerdown - The lower layer is down.
*/
static void
ipxcp_lowerdown(unit)
int unit;
{
fsm_lowerdown(&ipxcp_fsm[unit]);
}
/*
* ipxcp_input - Input IPXCP packet.
*/
static void
ipxcp_input(unit, p, len)
int unit;
u_char *p;
int len;
{
fsm_input(&ipxcp_fsm[unit], p, len);
}
/*
* ipxcp_protrej - A Protocol-Reject was received for IPXCP.
*
* Pretend the lower layer went down, so we shut up.
*/
static void
ipxcp_protrej(unit)
int unit;
{
fsm_lowerdown(&ipxcp_fsm[unit]);
}
/*
* ipxcp_resetci - Reset our CI.
*/
static void
ipxcp_resetci(f)
fsm *f;
{
wo->req_node = wo->neg_node && ao->neg_node;
wo->req_nn = wo->neg_nn && ao->neg_nn;
if (wo->our_network == 0) {
wo->neg_node = 1;
ao->accept_network = 1;
}
/*
* If our node number is zero then change it.
*/
if (zero_node (wo->our_node)) {
inc_node (wo->our_node);
ao->accept_local = 1;
wo->neg_node = 1;
}
/*
* If his node number is zero then change it.
*/
if (zero_node (wo->his_node)) {
inc_node (wo->his_node);
ao->accept_remote = 1;
}
/*
* If no routing agent was specified then we do RIP/SAP according to the
* RFC documents. If you have specified something then OK. Otherwise, we
* do RIP/SAP.
*/
if (ao->router == 0) {
ao->router |= BIT(RIP_SAP);
wo->router |= BIT(RIP_SAP);
}
/* Always specify a routing protocol unless it was REJected. */
wo->neg_router = 1;
/*
* Start with these default values
*/
*go = *wo;
}
/*
* ipxcp_cilen - Return length of our CI.
*/
static int
ipxcp_cilen(f)
fsm *f;
{
int len;
len = go->neg_nn ? CILEN_NETN : 0;
len += go->neg_node ? CILEN_NODEN : 0;
len += go->neg_name ? CILEN_NAME + strlen (go->name) - 1 : 0;
/* RFC says that defaults should not be included. */
if (go->neg_router && to_external(go->router) != RIP_SAP)
len += CILEN_PROTOCOL;
return (len);
}
/*
* ipxcp_addci - Add our desired CIs to a packet.
*/
static void
ipxcp_addci(f, ucp, lenp)
fsm *f;
u_char *ucp;
int *lenp;
{
/*
* Add the options to the record.
*/
if (go->neg_nn) {
PUTCHAR (IPX_NETWORK_NUMBER, ucp);
PUTCHAR (CILEN_NETN, ucp);
PUTLONG (go->our_network, ucp);
}
if (go->neg_node) {
int indx;
PUTCHAR (IPX_NODE_NUMBER, ucp);
PUTCHAR (CILEN_NODEN, ucp);
for (indx = 0; indx < sizeof (go->our_node); ++indx)
PUTCHAR (go->our_node[indx], ucp);
}
if (go->neg_name) {
int cilen = strlen (go->name);
int indx;
PUTCHAR (IPX_ROUTER_NAME, ucp);
PUTCHAR (CILEN_NAME + cilen - 1, ucp);
for (indx = 0; indx < cilen; ++indx)
PUTCHAR (go->name [indx], ucp);
}
if (go->neg_router) {
short external = to_external (go->router);
if (external != RIP_SAP) {
PUTCHAR (IPX_ROUTER_PROTOCOL, ucp);
PUTCHAR (CILEN_PROTOCOL, ucp);
PUTSHORT (external, ucp);
}
}
}
/*
* ipxcp_ackci - Ack our CIs.
*
* Returns:
* 0 - Ack was bad.
* 1 - Ack was good.
*/
static int
ipxcp_ackci(f, p, len)
fsm *f;
u_char *p;
int len;
{
u_short cilen, citype, cishort;
u_char cichar;
u_int32_t cilong;
#define ACKCIVOID(opt, neg) \
if (neg) { \
if ((len -= CILEN_VOID) < 0) \
break; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_VOID || \
citype != opt) \
break; \
}
#define ACKCICOMPLETE(opt,neg) ACKCIVOID(opt, neg)
#define ACKCICHARS(opt, neg, val, cnt) \
if (neg) { \
int indx, count = cnt; \
len -= (count + 2); \
if (len < 0) \
break; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != (count + 2) || \
citype != opt) \
break; \
for (indx = 0; indx < count; ++indx) {\
GETCHAR(cichar, p); \
if (cichar != ((u_char *) &val)[indx]) \
break; \
}\
if (indx != count) \
break; \
}
#define ACKCINODE(opt,neg,val) ACKCICHARS(opt,neg,val,sizeof(val))
#define ACKCINAME(opt,neg,val) ACKCICHARS(opt,neg,val,strlen(val))
#define ACKCINETWORK(opt, neg, val) \
if (neg) { \
if ((len -= CILEN_NETN) < 0) \
break; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_NETN || \
citype != opt) \
break; \
GETLONG(cilong, p); \
if (cilong != val) \
break; \
}
#define ACKCIPROTO(opt, neg, val) \
if (neg) { \
if (len < 2) \
break; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_PROTOCOL || citype != opt) \
break; \
len -= cilen; \
if (len < 0) \
break; \
GETSHORT(cishort, p); \
if (cishort != to_external (val) || cishort == RIP_SAP) \
break; \
}
/*
* Process the ACK frame in the order in which the frame was assembled
*/
do {
ACKCINETWORK (IPX_NETWORK_NUMBER, go->neg_nn, go->our_network);
ACKCINODE (IPX_NODE_NUMBER, go->neg_node, go->our_node);
ACKCINAME (IPX_ROUTER_NAME, go->neg_name, go->name);
if (len > 0)
ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router);
/*
* This is the end of the record.
*/
if (len == 0)
return (1);
} while (0);
/*
* The frame is invalid
*/
IPXCPDEBUG(("ipxcp_ackci: received bad Ack!"));
return (0);
}
/*
* ipxcp_nakci - Peer has sent a NAK for some of our CIs.
* This should not modify any state if the Nak is bad
* or if IPXCP is in the OPENED state.
*
* Returns:
* 0 - Nak was bad.
* 1 - Nak was good.
*/
static int
ipxcp_nakci(f, p, len)
fsm *f;
u_char *p;
int len;
{
u_char citype, cilen, *next;
u_short s;
u_int32_t l;
ipxcp_options no; /* options we've seen Naks for */
ipxcp_options try; /* options to request next time */
BZERO(&no, sizeof(no));
try = *go;
while (len > CILEN_VOID) {
GETCHAR (citype, p);
GETCHAR (cilen, p);
len -= cilen;
if (len < 0)
goto bad;
next = &p [cilen - CILEN_VOID];
switch (citype) {
case IPX_NETWORK_NUMBER:
if (!go->neg_nn || no.neg_nn || (cilen != CILEN_NETN))
goto bad;
no.neg_nn = 1;
GETLONG(l, p);
if (l && ao->accept_network)
try.our_network = l;
break;
case IPX_NODE_NUMBER:
if (!go->neg_node || no.neg_node || (cilen != CILEN_NODEN))
goto bad;
no.neg_node = 1;
if (!zero_node (p) && ao->accept_local &&
! compare_node (p, ho->his_node))
copy_node (p, try.our_node);
break;
/* This has never been sent. Ignore the NAK frame */
case IPX_COMPRESSION_PROTOCOL:
goto bad;
case IPX_ROUTER_PROTOCOL:
if (!go->neg_router || (cilen < CILEN_PROTOCOL))
goto bad;
GETSHORT (s, p);
if (s > 15) /* This is just bad, but ignore for now. */
break;
s = BIT(s);
if (no.router & s) /* duplicate NAKs are always bad */
goto bad;
if (no.router == 0) /* Reset on first NAK only */
try.router = 0;
no.router |= s;
try.router |= s;
try.neg_router = 1;
break;
/* These, according to the RFC, must never be NAKed. */
case IPX_ROUTER_NAME:
case IPX_COMPLETE:
goto bad;
/* These are for options which we have not seen. */
default:
break;
}
p = next;
}
/*
* Do not permit the peer to force a router protocol which we do not
* support. However, default to the condition that will accept "NONE".
*/
try.router &= (ao->router | BIT(IPX_NONE));
if (try.router == 0 && ao->router != 0)
try.router = BIT(IPX_NONE);
if (try.router != 0)
try.neg_router = 1;
/*
* OK, the Nak is good. Now we can update state.
* If there are any options left, we ignore them.
*/
if (f->state != OPENED)
*go = try;
return 1;
bad:
IPXCPDEBUG(("ipxcp_nakci: received bad Nak!"));
return 0;
}
/*
* ipxcp_rejci - Reject some of our CIs.
*/
static int
ipxcp_rejci(f, p, len)
fsm *f;
u_char *p;
int len;
{
u_short cilen, citype, cishort;
u_char cichar;
u_int32_t cilong;
ipxcp_options try; /* options to request next time */
#define REJCINETWORK(opt, neg, val) \
if (neg && p[0] == opt) { \
if ((len -= CILEN_NETN) < 0) \
break; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_NETN || \
citype != opt) \
break; \
GETLONG(cilong, p); \
if (cilong != val) \
break; \
neg = 0; \
}
#define REJCICHARS(opt, neg, val, cnt) \
if (neg && p[0] == opt) { \
int indx, count = cnt; \
len -= (count + 2); \
if (len < 0) \
break; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != (count + 2) || \
citype != opt) \
break; \
for (indx = 0; indx < count; ++indx) {\
GETCHAR(cichar, p); \
if (cichar != ((u_char *) &val)[indx]) \
break; \
}\
if (indx != count) \
break; \
neg = 0; \
}
#define REJCINODE(opt,neg,val) REJCICHARS(opt,neg,val,sizeof(val))
#define REJCINAME(opt,neg,val) REJCICHARS(opt,neg,val,strlen(val))
#define REJCIVOID(opt, neg) \
if (neg && p[0] == opt) { \
if ((len -= CILEN_VOID) < 0) \
break; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_VOID || citype != opt) \
break; \
neg = 0; \
}
/* a reject for RIP/SAP is invalid since we don't send it and you can't
reject something which is not sent. (You can NAK, but you can't REJ.) */
#define REJCIPROTO(opt, neg, val, bit) \
if (neg && p[0] == opt) { \
if ((len -= CILEN_PROTOCOL) < 0) \
break; \
GETCHAR(citype, p); \
GETCHAR(cilen, p); \
if (cilen != CILEN_PROTOCOL) \
break; \
GETSHORT(cishort, p); \
if (cishort != to_external (val) || cishort == RIP_SAP) \
break; \
neg = 0; \
}
/*
* 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.
*/
try = *go;
do {
REJCINETWORK (IPX_NETWORK_NUMBER, try.neg_nn, try.our_network);
REJCINODE (IPX_NODE_NUMBER, try.neg_node, try.our_node);
REJCINAME (IPX_ROUTER_NAME, try.neg_name, try.name);
REJCIPROTO (IPX_ROUTER_PROTOCOL, try.neg_router, try.router, 0);
/*
* This is the end of the record.
*/
if (len == 0) {
if (f->state != OPENED)
*go = try;
return (1);
}
} while (0);
/*
* The frame is invalid at this point.
*/
IPXCPDEBUG(("ipxcp_rejci: received bad Reject!"));
return 0;
}
/*
* ipxcp_reqci - Check the peer's requested CIs and send appropriate response.
*
* Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
* appropriately. If reject_if_disagree is non-zero, doesn't return
* CONFNAK; returns CONFREJ if it can't return CONFACK.
*/
static int
ipxcp_reqci(f, inp, len, reject_if_disagree)
fsm *f;
u_char *inp; /* Requested CIs */
int *len; /* Length of requested CIs */
int reject_if_disagree;
{
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 cinetwork; /* 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 */
/*
* 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? */
IPXCPDEBUG(("ipxcp_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 */
/*
* The network number must match. Choose the larger of the two.
*/
case IPX_NETWORK_NUMBER:
/* if we wont negotiate the network number or the length is wrong
then reject the option */
if ( !ao->neg_nn || cilen != CILEN_NETN ) {
orc = CONFREJ;
break;
}
GETLONG(cinetwork, p);
/* If the network numbers match then acknowledge them. */
if (cinetwork != 0) {
ho->his_network = cinetwork;
ho->neg_nn = 1;
if (wo->our_network == cinetwork)
break;
/*
* If the network number is not given or we don't accept their change or
* the network number is too small then NAK it.
*/
if (! ao->accept_network || cinetwork < wo->our_network) {
DECPTR (sizeof (u_int32_t), p);
PUTLONG (wo->our_network, p);
orc = CONFNAK;
}
break;
}
/*
* The peer sent '0' for the network. Give it ours if we have one.
*/
if (go->our_network != 0) {
DECPTR (sizeof (u_int32_t), p);
PUTLONG (wo->our_network, p);
orc = CONFNAK;
/*
* We don't have one. Reject the value.
*/
} else
orc = CONFREJ;
break;
/*
* The node number is required
*/
case IPX_NODE_NUMBER:
/* if we wont negotiate the node number or the length is wrong
then reject the option */
if ( cilen != CILEN_NODEN ) {
orc = CONFREJ;
break;
}
copy_node (p, ho->his_node);
ho->neg_node = 1;
/*
* If the remote does not have a number and we do then NAK it with the value
* which we have for it. (We never have a default value of zero.)
*/
if (zero_node (ho->his_node)) {
orc = CONFNAK;
copy_node (wo->his_node, p);
INCPTR (sizeof (wo->his_node), p);
break;
}
/*
* If you have given me the expected network node number then I'll accept
* it now.
*/
if (compare_node (wo->his_node, ho->his_node)) {
orc = CONFACK;
ho->neg_node = 1;
INCPTR (sizeof (wo->his_node), p);
break;
}
/*
* If his node number is the same as ours then ask him to try the next
* value.
*/
if (compare_node (ho->his_node, go->our_node)) {
inc_node (ho->his_node);
orc = CONFNAK;
copy_node (ho->his_node, p);
INCPTR (sizeof (wo->his_node), p);
break;
}
/*
* If we don't accept a new value then NAK it.
*/
if (! ao->accept_remote) {
copy_node (wo->his_node, p);
INCPTR (sizeof (wo->his_node), p);
orc = CONFNAK;
break;
}
orc = CONFACK;
ho->neg_node = 1;
INCPTR (sizeof (wo->his_node), p);
break;
/*
* Compression is not desired at this time. It is always rejected.
*/
case IPX_COMPRESSION_PROTOCOL:
orc = CONFREJ;
break;
/*
* The routing protocol is a bitmask of various types. Any combination
* of the values RIP_SAP and NLSP are permissible. 'IPX_NONE' for no
* routing protocol must be specified only once.
*/
case IPX_ROUTER_PROTOCOL:
if ( !ao->neg_router || cilen < CILEN_PROTOCOL ) {
orc = CONFREJ;
break;
}
GETSHORT (cishort, p);
if (wo->neg_router == 0) {
wo->neg_router = 1;
wo->router = BIT(IPX_NONE);
}
if ((cishort == IPX_NONE && ho->router != 0) ||
(ho->router & BIT(IPX_NONE))) {
orc = CONFREJ;
break;
}
cishort = BIT(cishort);
if (ho->router & cishort) {
orc = CONFREJ;
break;
}
ho->router |= cishort;
ho->neg_router = 1;
/* Finally do not allow a router protocol which we do not
support. */
if ((cishort & (ao->router | BIT(IPX_NONE))) == 0) {
int protocol;
if (cishort == BIT(NLSP) &&
(ao->router & BIT(RIP_SAP)) &&
!wo->tried_rip) {
protocol = RIP_SAP;
wo->tried_rip = 1;
} else
protocol = IPX_NONE;
DECPTR (sizeof (u_int16_t), p);
PUTSHORT (protocol, p);
orc = CONFNAK;
}
break;
/*
* The router name is advisorary. Just accept it if it is not too large.
*/
case IPX_ROUTER_NAME:
if (cilen >= CILEN_NAME) {
int name_size = cilen - CILEN_NAME;
if (name_size > sizeof (ho->name))
name_size = sizeof (ho->name) - 1;
memset (ho->name, 0, sizeof (ho->name));
memcpy (ho->name, p, name_size);
ho->name [name_size] = '\0';
ho->neg_name = 1;
orc = CONFACK;
break;
}
orc = CONFREJ;
break;
/*
* This is advisorary.
*/
case IPX_COMPLETE:
if (cilen != CILEN_COMPLETE)
orc = CONFREJ;
else {
ho->neg_complete = 1;
orc = CONFACK;
}
break;
/*
* All other entries are not known at this time.
*/
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 */
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 IPX_NODE_NUMBER option appended. We assume the
* input buffer is long enough that we can append the extra
* option safely.
*/
if (rc != CONFREJ && !ho->neg_node &&
wo->req_nn && !reject_if_disagree) {
if (rc == CONFACK) {
rc = CONFNAK;
wo->req_nn = 0; /* don't ask again */
ucp = inp; /* reset pointer */
}
if (zero_node (wo->his_node))
inc_node (wo->his_node);
PUTCHAR (IPX_NODE_NUMBER, ucp);
PUTCHAR (CILEN_NODEN, ucp);
copy_node (wo->his_node, ucp);
INCPTR (sizeof (wo->his_node), ucp);
}
*len = ucp - inp; /* Compute output length */
IPXCPDEBUG(("ipxcp: returning Configure-%s", CODENAME(rc)));
return (rc); /* Return final code */
}
/*
* ipxcp_up - IPXCP has come UP.
*
* Configure the IP network interface appropriately and bring it up.
*/
static void
ipxcp_up(f)
fsm *f;
{
int unit = f->unit;
IPXCPDEBUG(("ipxcp: up"));
/* The default router protocol is RIP/SAP. */
if (ho->router == 0)
ho->router = BIT(RIP_SAP);
if (go->router == 0)
go->router = BIT(RIP_SAP);
/* Fetch the network number */
if (!ho->neg_nn)
ho->his_network = wo->his_network;
if (!ho->neg_node)
copy_node (wo->his_node, ho->his_node);
if (!wo->neg_node && !go->neg_node)
copy_node (wo->our_node, go->our_node);
if (zero_node (go->our_node)) {
static char errmsg[] = "Could not determine local IPX node address";
if (debug)
error(errmsg);
ipxcp_close(f->unit, errmsg);
return;
}
go->network = go->our_network;
if (ho->his_network != 0 && ho->his_network > go->network)
go->network = ho->his_network;
if (go->network == 0) {
static char errmsg[] = "Can not determine network number";
if (debug)
error(errmsg);
ipxcp_close (unit, errmsg);
return;
}
/* bring the interface up */
if (!sifup(unit)) {
if (debug)
warn("sifup failed (IPX)");
ipxcp_close(unit, "Interface configuration failed");
return;
}
ipxcp_is_up = 1;
/* set the network number for IPX */
if (!sipxfaddr(unit, go->network, go->our_node)) {
if (debug)
warn("sipxfaddr failed");
ipxcp_close(unit, "Interface configuration failed");
return;
}
np_up(f->unit, PPP_IPX);
}
/*
* ipxcp_down - IPXCP has gone DOWN.
*
* Take the IP network interface down, clear its addresses
* and delete routes through it.
*/
static void
ipxcp_down(f)
fsm *f;
{
IPXCPDEBUG(("ipxcp: down"));
if (!ipxcp_is_up)
return;
ipxcp_is_up = 0;
np_down(f->unit, PPP_IPX);
cipxfaddr(f->unit);
sifnpmode(f->unit, PPP_IPX, NPMODE_DROP);
sifdown(f->unit);
}
/*
* ipxcp_finished - possibly shut down the lower layers.
*/
static void
ipxcp_finished(f)
fsm *f;
{
np_finished(f->unit, PPP_IPX);
}
/*
* ipxcp_printpkt - print the contents of an IPXCP packet.
*/
static char *ipxcp_codenames[] = {
"ConfReq", "ConfAck", "ConfNak", "ConfRej",
"TermReq", "TermAck", "CodeRej"
};
static int
ipxcp_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(ipxcp_codenames) / sizeof(char *))
printer(arg, " %s", ipxcp_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 < CILEN_VOID || olen > len) {
break;
}
printer(arg, " <");
len -= olen;
optend = p + olen;
switch (code) {
case IPX_NETWORK_NUMBER:
if (olen == CILEN_NETN) {
p += 2;
GETLONG(cilong, p);
printer (arg, "network %s", ipx_ntoa (cilong));
}
break;
case IPX_NODE_NUMBER:
if (olen == CILEN_NODEN) {
p += 2;
printer (arg, "node ");
while (p < optend) {
GETCHAR(code, p);
printer(arg, "%.2x", (int) (unsigned int) (unsigned char) code);
}
}
break;
case IPX_COMPRESSION_PROTOCOL:
if (olen == CILEN_COMPRESS) {
p += 2;
GETSHORT (cishort, p);
printer (arg, "compression %d", (int) cishort);
}
break;
case IPX_ROUTER_PROTOCOL:
if (olen == CILEN_PROTOCOL) {
p += 2;
GETSHORT (cishort, p);
printer (arg, "router proto %d", (int) cishort);
}
break;
case IPX_ROUTER_NAME:
if (olen >= CILEN_NAME) {
p += 2;
printer (arg, "router name \"");
while (p < optend) {
GETCHAR(code, p);
if (code >= 0x20 && code <= 0x7E)
printer (arg, "%c", (int) (unsigned int) (unsigned char) code);
else
printer (arg, " \\%.2x", (int) (unsigned int) (unsigned char) code);
}
printer (arg, "\"");
}
break;
case IPX_COMPLETE:
if (olen == CILEN_COMPLETE) {
p += 2;
printer (arg, "complete");
}
break;
default:
break;
}
while (p < optend) {
GETCHAR(code, p);
printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code);
}
printer(arg, ">");
}
break;
case TERMACK:
case TERMREQ:
if (len > 0 && *p >= ' ' && *p < 0x7f) {
printer(arg, " ");
print_string(p, len, printer, arg);
p += len;
len = 0;
}
break;
}
/* print the rest of the bytes in the packet */
for (; len > 0; --len) {
GETCHAR(code, p);
printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code);
}
return p - pstart;
}
#endif /* ifdef IPX_CHANGE */
