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freebsd-skq/usr.sbin/ppp/cbcp.c
brian 93764b6de1 Be concerned about huge callback numbers by truncating them rather than 
scribbling past the end of our buffer.

Problem spotted by:	Damien COUDERC couderc at openbsd dot org
2005-02-15 10:59:54 +00:00

764 lines
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/*-
* Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#ifdef __FreeBSD__
#include <netinet/in.h>
#endif
#include <sys/un.h>
#include <string.h>
#include <termios.h>
#include "layer.h"
#include "defs.h"
#include "log.h"
#include "timer.h"
#include "descriptor.h"
#include "lqr.h"
#include "mbuf.h"
#include "fsm.h"
#include "throughput.h"
#include "hdlc.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "async.h"
#include "physical.h"
#include "proto.h"
#include "cbcp.h"
#include "mp.h"
#include "chat.h"
#include "auth.h"
#include "chap.h"
#include "datalink.h"
void
cbcp_Init(struct cbcp *cbcp, struct physical *p)
{
cbcp->required = 0;
cbcp->fsm.state = CBCP_CLOSED;
cbcp->fsm.id = 0;
cbcp->fsm.delay = 0;
*cbcp->fsm.phone = '\0';
memset(&cbcp->fsm.timer, '\0', sizeof cbcp->fsm.timer);
cbcp->p = p;
}
static void cbcp_SendReq(struct cbcp *);
static void cbcp_SendResponse(struct cbcp *);
static void cbcp_SendAck(struct cbcp *);
static void
cbcp_Timeout(void *v)
{
struct cbcp *cbcp = (struct cbcp *)v;
timer_Stop(&cbcp->fsm.timer);
if (cbcp->fsm.restart) {
switch (cbcp->fsm.state) {
case CBCP_CLOSED:
case CBCP_STOPPED:
log_Printf(LogCBCP, "%s: Urk - unexpected CBCP timeout !\n",
cbcp->p->dl->name);
break;
case CBCP_REQSENT:
cbcp_SendReq(cbcp);
break;
case CBCP_RESPSENT:
cbcp_SendResponse(cbcp);
break;
case CBCP_ACKSENT:
cbcp_SendAck(cbcp);
break;
}
} else {
const char *missed;
switch (cbcp->fsm.state) {
case CBCP_STOPPED:
missed = "REQ";
break;
case CBCP_REQSENT:
missed = "RESPONSE";
break;
case CBCP_RESPSENT:
missed = "ACK";
break;
case CBCP_ACKSENT:
missed = "Terminate REQ";
break;
default:
log_Printf(LogCBCP, "%s: Urk - unexpected CBCP timeout !\n",
cbcp->p->dl->name);
missed = NULL;
break;
}
if (missed)
log_Printf(LogCBCP, "%s: Timeout waiting for peer %s\n",
cbcp->p->dl->name, missed);
datalink_CBCPFailed(cbcp->p->dl);
}
}
static void
cbcp_StartTimer(struct cbcp *cbcp, int timeout)
{
timer_Stop(&cbcp->fsm.timer);
cbcp->fsm.timer.func = cbcp_Timeout;
cbcp->fsm.timer.name = "cbcp";
cbcp->fsm.timer.load = timeout * SECTICKS;
cbcp->fsm.timer.arg = cbcp;
timer_Start(&cbcp->fsm.timer);
}
#define CBCP_CLOSED (0) /* Not in use */
#define CBCP_STOPPED (1) /* Waiting for a REQ */
#define CBCP_REQSENT (2) /* Waiting for a RESP */
#define CBCP_RESPSENT (3) /* Waiting for an ACK */
#define CBCP_ACKSENT (4) /* Waiting for an LCP Term REQ */
static const char * const cbcpname[] = {
"closed", "stopped", "req-sent", "resp-sent", "ack-sent"
};
static const char *
cbcpstate(unsigned s)
{
if (s < sizeof cbcpname / sizeof cbcpname[0])
return cbcpname[s];
return HexStr(s, NULL, 0);
}
static void
cbcp_NewPhase(struct cbcp *cbcp, int new)
{
if (cbcp->fsm.state != new) {
log_Printf(LogCBCP, "%s: State change %s --> %s\n", cbcp->p->dl->name,
cbcpstate(cbcp->fsm.state), cbcpstate(new));
cbcp->fsm.state = new;
}
}
struct cbcp_header {
u_char code;
u_char id;
u_int16_t length; /* Network byte order */
};
/* cbcp_header::code values */
#define CBCP_REQ (1)
#define CBCP_RESPONSE (2)
#define CBCP_ACK (3)
struct cbcp_data {
u_char type;
u_char length;
u_char delay;
char addr_start[253]; /* max cbcp_data length 255 + 1 for NULL */
};
/* cbcp_data::type values */
#define CBCP_NONUM (1)
#define CBCP_CLIENTNUM (2)
#define CBCP_SERVERNUM (3)
#define CBCP_LISTNUM (4)
static void
cbcp_Output(struct cbcp *cbcp, u_char code, struct cbcp_data *data)
{
struct cbcp_header *head;
struct mbuf *bp;
bp = m_get(sizeof *head + data->length, MB_CBCPOUT);
head = (struct cbcp_header *)MBUF_CTOP(bp);
head->code = code;
head->id = cbcp->fsm.id;
head->length = htons(sizeof *head + data->length);
memcpy(MBUF_CTOP(bp) + sizeof *head, data, data->length);
log_DumpBp(LogDEBUG, "cbcp_Output", bp);
link_PushPacket(&cbcp->p->link, bp, cbcp->p->dl->bundle,
LINK_QUEUES(&cbcp->p->link) - 1, PROTO_CBCP);
}
static const char *
cbcp_data_Type(unsigned type)
{
static const char * const types[] = {
"No callback", "User-spec", "Server-spec", "list"
};
if (type < 1 || type > sizeof types / sizeof types[0])
return HexStr(type, NULL, 0);
return types[type-1];
}
struct cbcp_addr {
u_char type;
char addr[sizeof ((struct cbcp_data *)0)->addr_start - 1]; /* ASCIIZ */
};
/* cbcp_data::type values */
#define CBCP_ADDR_PSTN (1)
static void
cbcp_data_Show(struct cbcp_data *data)
{
struct cbcp_addr *addr;
char *end;
addr = (struct cbcp_addr *)data->addr_start;
end = (char *)data + data->length;
*end = '\0';
log_Printf(LogCBCP, " TYPE %s\n", cbcp_data_Type(data->type));
if ((char *)&data->delay < end) {
log_Printf(LogCBCP, " DELAY %d\n", data->delay);
while (addr->addr < end) {
if (addr->type == CBCP_ADDR_PSTN)
log_Printf(LogCBCP, " ADDR %s\n", addr->addr);
else
log_Printf(LogCBCP, " ADDR type %d ??\n", (int)addr->type);
addr = (struct cbcp_addr *)(addr->addr + strlen(addr->addr) + 1);
}
}
}
static void
cbcp_SendReq(struct cbcp *cbcp)
{
struct cbcp_data data;
struct cbcp_addr *addr;
char list[sizeof cbcp->fsm.phone], *next;
int len, max;
/* Only callees send REQs */
log_Printf(LogCBCP, "%s: SendReq(%d) state = %s\n", cbcp->p->dl->name,
cbcp->fsm.id, cbcpstate(cbcp->fsm.state));
data.type = cbcp->fsm.type;
data.delay = 0;
strncpy(list, cbcp->fsm.phone, sizeof list - 1);
list[sizeof list - 1] = '\0';
switch (data.type) {
case CBCP_CLIENTNUM:
addr = (struct cbcp_addr *)data.addr_start;
addr->type = CBCP_ADDR_PSTN;
*addr->addr = '\0';
data.length = addr->addr - (char *)&data;
break;
case CBCP_LISTNUM:
addr = (struct cbcp_addr *)data.addr_start;
for (next = strtok(list, ","); next; next = strtok(NULL, ",")) {
len = strlen(next);
max = data.addr_start + sizeof data.addr_start - addr->addr - 1;
if (len <= max) {
addr->type = CBCP_ADDR_PSTN;
strncpy(addr->addr, next, sizeof addr->addr - 1);
addr->addr[sizeof addr->addr - 1] = '\0';
addr = (struct cbcp_addr *)((char *)addr + len + 2);
} else
log_Printf(LogWARN, "CBCP ADDR \"%s\" skipped - packet too large\n",
next);
}
data.length = (char *)addr - (char *)&data;
break;
case CBCP_SERVERNUM:
data.length = data.addr_start - (char *)&data;
break;
default:
data.length = (char *)&data.delay - (char *)&data;
break;
}
cbcp_data_Show(&data);
cbcp_Output(cbcp, CBCP_REQ, &data);
cbcp->fsm.restart--;
cbcp_StartTimer(cbcp, cbcp->fsm.delay);
cbcp_NewPhase(cbcp, CBCP_REQSENT); /* Wait for a RESPONSE */
}
void
cbcp_Up(struct cbcp *cbcp)
{
struct lcp *lcp = &cbcp->p->link.lcp;
cbcp->fsm.delay = cbcp->p->dl->cfg.cbcp.delay;
if (*cbcp->p->dl->peer.authname == '\0' ||
!auth_SetPhoneList(cbcp->p->dl->peer.authname, cbcp->fsm.phone,
sizeof cbcp->fsm.phone)) {
strncpy(cbcp->fsm.phone, cbcp->p->dl->cfg.cbcp.phone,
sizeof cbcp->fsm.phone - 1);
cbcp->fsm.phone[sizeof cbcp->fsm.phone - 1] = '\0';
}
if (lcp->want_callback.opmask) {
if (*cbcp->fsm.phone == '\0')
cbcp->fsm.type = CBCP_NONUM;
else if (!strcmp(cbcp->fsm.phone, "*")) {
cbcp->fsm.type = CBCP_SERVERNUM;
*cbcp->fsm.phone = '\0';
} else
cbcp->fsm.type = CBCP_CLIENTNUM;
cbcp_NewPhase(cbcp, CBCP_STOPPED); /* Wait for a REQ */
cbcp_StartTimer(cbcp, cbcp->fsm.delay * DEF_FSMTRIES);
} else {
if (*cbcp->fsm.phone == '\0')
cbcp->fsm.type = CBCP_NONUM;
else if (!strcmp(cbcp->fsm.phone, "*")) {
cbcp->fsm.type = CBCP_CLIENTNUM;
*cbcp->fsm.phone = '\0';
} else if (strchr(cbcp->fsm.phone, ','))
cbcp->fsm.type = CBCP_LISTNUM;
else
cbcp->fsm.type = CBCP_SERVERNUM;
cbcp->fsm.restart = DEF_FSMTRIES;
cbcp_SendReq(cbcp);
}
}
static int
cbcp_AdjustResponse(struct cbcp *cbcp, struct cbcp_data *data)
{
/*
* We've received a REQ (data). Adjust our reponse (cbcp->fsm.*)
* so that we (hopefully) agree with the peer
*/
struct cbcp_addr *addr;
switch (data->type) {
case CBCP_NONUM:
if (cbcp->p->dl->cfg.callback.opmask & CALLBACK_BIT(CALLBACK_NONE))
/*
* if ``none'' is a configured callback possibility
* (ie, ``set callback cbcp none''), go along with the callees
* request
*/
cbcp->fsm.type = CBCP_NONUM;
/*
* Otherwise, we send our desired response anyway. This seems to be
* what Win95 does - although I can't find this behaviour documented
* in the CBCP spec....
*/
return 1;
case CBCP_CLIENTNUM:
if (cbcp->fsm.type == CBCP_CLIENTNUM) {
char *ptr;
if (data->length > data->addr_start - (char *)data) {
/*
* The peer has given us an address type spec - make sure we
* understand !
*/
addr = (struct cbcp_addr *)data->addr_start;
if (addr->type != CBCP_ADDR_PSTN) {
log_Printf(LogPHASE, "CBCP: Unrecognised address type %d !\n",
(int)addr->type);
return 0;
}
}
/* we accept the REQ even if the peer didn't specify an addr->type */
ptr = strchr(cbcp->fsm.phone, ',');
if (ptr)
*ptr = '\0'; /* Just use the first number in our list */
return 1;
}
log_Printf(LogPHASE, "CBCP: no number to pass to the peer !\n");
return 0;
case CBCP_SERVERNUM:
if (cbcp->fsm.type == CBCP_SERVERNUM) {
*cbcp->fsm.phone = '\0';
return 1;
}
if (data->length > data->addr_start - (char *)data) {
/*
* This violates the spec, but if the peer has told us the
* number it wants to call back, take advantage of this fact
* and allow things to proceed if we've specified the same
* number
*/
addr = (struct cbcp_addr *)data->addr_start;
if (addr->type != CBCP_ADDR_PSTN) {
log_Printf(LogPHASE, "CBCP: Unrecognised address type %d !\n",
(int)addr->type);
return 0;
} else if (cbcp->fsm.type == CBCP_CLIENTNUM) {
/*
* If the peer's insisting on deciding the number, make sure
* it's one of the ones in our list. If it is, let the peer
* think it's in control :-)
*/
char list[sizeof cbcp->fsm.phone], *next;
strncpy(list, cbcp->fsm.phone, sizeof list - 1);
list[sizeof list - 1] = '\0';
for (next = strtok(list, ","); next; next = strtok(NULL, ","))
if (!strcmp(next, addr->addr)) {
cbcp->fsm.type = CBCP_SERVERNUM;
strcpy(cbcp->fsm.phone, next);
return 1;
}
}
}
log_Printf(LogPHASE, "CBCP: Peer won't allow local decision !\n");
return 0;
case CBCP_LISTNUM:
if (cbcp->fsm.type == CBCP_CLIENTNUM || cbcp->fsm.type == CBCP_LISTNUM) {
/*
* Search through ``data''s addresses and see if cbcp->fsm.phone
* contains any of them
*/
char list[sizeof cbcp->fsm.phone], *next, *end;
addr = (struct cbcp_addr *)data->addr_start;
end = (char *)data + data->length;
while (addr->addr < end) {
if (addr->type == CBCP_ADDR_PSTN) {
strncpy(list, cbcp->fsm.phone, sizeof list - 1);
list[sizeof list - 1] = '\0';
for (next = strtok(list, ","); next; next = strtok(NULL, ","))
if (!strcmp(next, addr->addr)) {
cbcp->fsm.type = CBCP_LISTNUM;
strcpy(cbcp->fsm.phone, next);
return 1;
}
} else
log_Printf(LogCBCP, "Warning: Unrecognised address type %d !\n",
(int)addr->type);
addr = (struct cbcp_addr *)(addr->addr + strlen(addr->addr) + 1);
}
}
log_Printf(LogPHASE, "CBCP: no good number to pass to the peer !\n");
return 0;
}
log_Printf(LogCBCP, "Unrecognised REQ type %d !\n", (int)data->type);
return 0;
}
static void
cbcp_SendResponse(struct cbcp *cbcp)
{
struct cbcp_data data;
struct cbcp_addr *addr;
/* Only callers send RESPONSEs */
log_Printf(LogCBCP, "%s: SendResponse(%d) state = %s\n", cbcp->p->dl->name,
cbcp->fsm.id, cbcpstate(cbcp->fsm.state));
data.type = cbcp->fsm.type;
data.delay = cbcp->fsm.delay;
addr = (struct cbcp_addr *)data.addr_start;
if (data.type == CBCP_NONUM)
data.length = (char *)&data.delay - (char *)&data;
else if (*cbcp->fsm.phone) {
addr->type = CBCP_ADDR_PSTN;
strncpy(addr->addr, cbcp->fsm.phone, sizeof addr->addr - 1);
addr->addr[sizeof addr->addr - 1] = '\0';
data.length = (addr->addr + strlen(addr->addr) + 1) - (char *)&data;
} else
data.length = data.addr_start - (char *)&data;
cbcp_data_Show(&data);
cbcp_Output(cbcp, CBCP_RESPONSE, &data);
cbcp->fsm.restart--;
cbcp_StartTimer(cbcp, cbcp->fsm.delay);
cbcp_NewPhase(cbcp, CBCP_RESPSENT); /* Wait for an ACK */
}
/* What to do after checking an incoming response */
#define CBCP_ACTION_DOWN (0)
#define CBCP_ACTION_REQ (1)
#define CBCP_ACTION_ACK (2)
static int
cbcp_CheckResponse(struct cbcp *cbcp, struct cbcp_data *data)
{
/*
* We've received a RESPONSE (data). Check if it agrees with
* our REQ (cbcp->fsm)
*/
struct cbcp_addr *addr;
addr = (struct cbcp_addr *)data->addr_start;
if (data->type == cbcp->fsm.type) {
switch (cbcp->fsm.type) {
case CBCP_NONUM:
return CBCP_ACTION_ACK;
case CBCP_CLIENTNUM:
if ((char *)data + data->length <= addr->addr)
log_Printf(LogPHASE, "CBCP: peer didn't respond with a number !\n");
else if (addr->type != CBCP_ADDR_PSTN)
log_Printf(LogPHASE, "CBCP: Unrecognised address type %d !\n",
addr->type);
else {
strncpy(cbcp->fsm.phone, addr->addr, sizeof cbcp->fsm.phone - 1);
cbcp->fsm.phone[sizeof cbcp->fsm.phone - 1] = '\0';
cbcp->fsm.delay = data->delay;
return CBCP_ACTION_ACK;
}
return CBCP_ACTION_DOWN;
case CBCP_SERVERNUM:
cbcp->fsm.delay = data->delay;
return CBCP_ACTION_ACK;
case CBCP_LISTNUM:
if ((char *)data + data->length <= addr->addr)
log_Printf(LogPHASE, "CBCP: peer didn't respond with a number !\n");
else if (addr->type != CBCP_ADDR_PSTN)
log_Printf(LogPHASE, "CBCP: Unrecognised address type %d !\n",
addr->type);
else {
char list[sizeof cbcp->fsm.phone], *next;
strncpy(list, cbcp->fsm.phone, sizeof list - 1);
list[sizeof list - 1] = '\0';
for (next = strtok(list, ","); next; next = strtok(NULL, ","))
if (!strcmp(addr->addr, next)) {
strcpy(cbcp->fsm.phone, next);
cbcp->fsm.delay = data->delay;
return CBCP_ACTION_ACK;
}
log_Printf(LogPHASE, "CBCP: peer didn't respond with a "
"valid number !\n");
}
return CBCP_ACTION_DOWN;
}
log_Printf(LogPHASE, "Internal CBCP error - agreed on %d !\n",
(int)cbcp->fsm.type);
return CBCP_ACTION_DOWN;
} else if (data->type == CBCP_NONUM && cbcp->fsm.type == CBCP_CLIENTNUM) {
/*
* Client doesn't want CBCP after all....
* We only allow this when ``set cbcp *'' has been specified.
*/
cbcp->fsm.type = CBCP_NONUM;
return CBCP_ACTION_ACK;
}
log_Printf(LogCBCP, "Invalid peer RESPONSE\n");
return CBCP_ACTION_REQ;
}
static void
cbcp_SendAck(struct cbcp *cbcp)
{
struct cbcp_data data;
struct cbcp_addr *addr;
/* Only callees send ACKs */
log_Printf(LogCBCP, "%s: SendAck(%d) state = %s\n", cbcp->p->dl->name,
cbcp->fsm.id, cbcpstate(cbcp->fsm.state));
data.type = cbcp->fsm.type;
switch (data.type) {
case CBCP_NONUM:
data.length = (char *)&data.delay - (char *)&data;
break;
case CBCP_CLIENTNUM:
addr = (struct cbcp_addr *)data.addr_start;
addr->type = CBCP_ADDR_PSTN;
strncpy(addr->addr, cbcp->fsm.phone, sizeof addr->addr - 1);
addr->addr[sizeof addr->addr - 1] = '\0';
data.delay = cbcp->fsm.delay;
data.length = addr->addr + strlen(addr->addr) + 1 - (char *)&data;
break;
default:
data.delay = cbcp->fsm.delay;
data.length = data.addr_start - (char *)&data;
break;
}
cbcp_data_Show(&data);
cbcp_Output(cbcp, CBCP_ACK, &data);
cbcp->fsm.restart--;
cbcp_StartTimer(cbcp, cbcp->fsm.delay);
cbcp_NewPhase(cbcp, CBCP_ACKSENT); /* Wait for an ACK */
}
extern struct mbuf *
cbcp_Input(struct bundle *bundle __unused, struct link *l, struct mbuf *bp)
{
struct physical *p = link2physical(l);
struct cbcp_header *head;
struct cbcp_data *data;
struct cbcp *cbcp = &p->dl->cbcp;
size_t len;
if (p == NULL) {
log_Printf(LogERROR, "cbcp_Input: Not a physical link - dropped\n");
m_freem(bp);
return NULL;
}
bp = m_pullup(bp);
len = m_length(bp);
if (len < sizeof(struct cbcp_header)) {
m_freem(bp);
return NULL;
}
head = (struct cbcp_header *)MBUF_CTOP(bp);
if (ntohs(head->length) != len) {
log_Printf(LogWARN, "Corrupt CBCP packet (code %d, length %u not %zu)"
" - ignored\n", head->code, ntohs(head->length), len);
m_freem(bp);
return NULL;
}
m_settype(bp, MB_CBCPIN);
/* XXX check the id */
bp->m_offset += sizeof(struct cbcp_header);
bp->m_len -= sizeof(struct cbcp_header);
data = (struct cbcp_data *)MBUF_CTOP(bp);
switch (head->code) {
case CBCP_REQ:
log_Printf(LogCBCP, "%s: RecvReq(%d) state = %s\n",
p->dl->name, head->id, cbcpstate(cbcp->fsm.state));
cbcp_data_Show(data);
if (cbcp->fsm.state == CBCP_STOPPED || cbcp->fsm.state == CBCP_RESPSENT) {
timer_Stop(&cbcp->fsm.timer);
if (cbcp_AdjustResponse(cbcp, data)) {
cbcp->fsm.restart = DEF_FSMTRIES;
cbcp->fsm.id = head->id;
cbcp_SendResponse(cbcp);
} else
datalink_CBCPFailed(cbcp->p->dl);
} else
log_Printf(LogCBCP, "%s: unexpected REQ dropped\n", p->dl->name);
break;
case CBCP_RESPONSE:
log_Printf(LogCBCP, "%s: RecvResponse(%d) state = %s\n",
p->dl->name, head->id, cbcpstate(cbcp->fsm.state));
cbcp_data_Show(data);
if (cbcp->fsm.id != head->id) {
log_Printf(LogCBCP, "Warning: Expected id was %d, not %d\n",
cbcp->fsm.id, head->id);
cbcp->fsm.id = head->id;
}
if (cbcp->fsm.state == CBCP_REQSENT || cbcp->fsm.state == CBCP_ACKSENT) {
timer_Stop(&cbcp->fsm.timer);
switch (cbcp_CheckResponse(cbcp, data)) {
case CBCP_ACTION_REQ:
cbcp_SendReq(cbcp);
break;
case CBCP_ACTION_ACK:
cbcp->fsm.restart = DEF_FSMTRIES;
cbcp_SendAck(cbcp);
if (cbcp->fsm.type == CBCP_NONUM) {
/*
* Don't change state in case the peer doesn't get our ACK,
* just bring the layer up.
*/
timer_Stop(&cbcp->fsm.timer);
datalink_NCPUp(cbcp->p->dl);
}
break;
default:
datalink_CBCPFailed(cbcp->p->dl);
break;
}
} else
log_Printf(LogCBCP, "%s: unexpected RESPONSE dropped\n", p->dl->name);
break;
case CBCP_ACK:
log_Printf(LogCBCP, "%s: RecvAck(%d) state = %s\n",
p->dl->name, head->id, cbcpstate(cbcp->fsm.state));
cbcp_data_Show(data);
if (cbcp->fsm.id != head->id) {
log_Printf(LogCBCP, "Warning: Expected id was %d, not %d\n",
cbcp->fsm.id, head->id);
cbcp->fsm.id = head->id;
}
if (cbcp->fsm.type == CBCP_NONUM) {
/*
* Don't change state in case the peer doesn't get our ACK,
* just bring the layer up.
*/
timer_Stop(&cbcp->fsm.timer);
datalink_NCPUp(cbcp->p->dl);
} else if (cbcp->fsm.state == CBCP_RESPSENT) {
timer_Stop(&cbcp->fsm.timer);
datalink_CBCPComplete(cbcp->p->dl);
log_Printf(LogPHASE, "%s: CBCP: Peer will dial back\n", p->dl->name);
} else
log_Printf(LogCBCP, "%s: unexpected ACK dropped\n", p->dl->name);
break;
default:
log_Printf(LogWARN, "Unrecognised CBCP packet (code %d, length %zd)\n",
head->code, len);
break;
}
m_freem(bp);
return NULL;
}
void
cbcp_Down(struct cbcp *cbcp)
{
timer_Stop(&cbcp->fsm.timer);
cbcp_NewPhase(cbcp, CBCP_CLOSED);
cbcp->required = 0;
}
void
cbcp_ReceiveTerminateReq(struct physical *p)
{
if (p->dl->cbcp.fsm.state == CBCP_ACKSENT) {
/* Don't change our state in case the peer doesn't get the ACK */
p->dl->cbcp.required = 1;
log_Printf(LogPHASE, "%s: CBCP: Will dial back on %s\n", p->dl->name,
p->dl->cbcp.fsm.phone);
} else
cbcp_NewPhase(&p->dl->cbcp, CBCP_CLOSED);
}
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