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freebsd-skq/usr.sbin/ppp/cbcp.c
pfg 7551d83c35 various: general adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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 response (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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