/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* 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.
*
*/
#include <sys/types.h>
#include <netinet/in_systm.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include "defs.h"
#include "layer.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "lqr.h"
#include "hdlc.h"
#include "throughput.h"
#include "proto.h"
#include "fsm.h"
#include "descriptor.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "prompt.h"
#include "async.h"
#include "physical.h"
#include "mp.h"
#include "iplist.h"
#include "slcompress.h"
#include "ncpaddr.h"
#include "ip.h"
#include "ipcp.h"
#include "ipv6cp.h"
#include "auth.h"
#include "pap.h"
#include "chap.h"
#include "cbcp.h"
#include "command.h"
static void Despatch(struct bundle *, struct link *, struct mbuf *, u_short);
static inline void
link_AddInOctets(struct link *l, int n)
{
if (l->stats.gather) {
throughput_addin(&l->stats.total, n);
if (l->stats.parent)
throughput_addin(l->stats.parent, n);
}
}
static inline void
link_AddOutOctets(struct link *l, int n)
{
if (l->stats.gather) {
throughput_addout(&l->stats.total, n);
if (l->stats.parent)
throughput_addout(l->stats.parent, n);
}
}
void
link_SequenceQueue(struct link *l)
{
struct mqueue *queue, *highest;
log_Printf(LogDEBUG, "link_SequenceQueue\n");
highest = LINK_HIGHQ(l);
for (queue = l->Queue; queue < highest; queue++)
while (queue->len)
m_enqueue(highest, m_dequeue(queue));
}
void
link_DeleteQueue(struct link *l)
{
struct mqueue *queue, *highest;
highest = LINK_HIGHQ(l);
for (queue = l->Queue; queue <= highest; queue++)
while (queue->top)
m_freem(m_dequeue(queue));
}
size_t
link_QueueLen(struct link *l)
{
unsigned i;
size_t len;
for (i = 0, len = 0; i < LINK_QUEUES(l); i++)
len += l->Queue[i].len;
return len;
}
size_t
link_QueueBytes(struct link *l)
{
unsigned i;
size_t len, bytes;
struct mbuf *m;
bytes = 0;
for (i = 0, len = 0; i < LINK_QUEUES(l); i++) {
len = l->Queue[i].len;
m = l->Queue[i].top;
while (len--) {
bytes += m_length(m);
m = m->m_nextpkt;
}
}
return bytes;
}
void
link_PendingLowPriorityData(struct link *l, size_t *pkts, size_t *octets)
{
struct mqueue *queue, *highest;
struct mbuf *m;
size_t len;
/*
* This is all rfc1989 stuff... because our LQR packet is going to bypass
* everything that's not in the highest priority queue, we must be able to
* subtract that data from our outgoing packet/octet counts. However,
* we've already async-encoded our data at this point, but the async
* encodings MUSTn't be a part of the LQR-reported payload :( So, we have
* the async layer record how much it's padded the packet in the mbuf's
* priv field, and when we calculate our outgoing LQR values we subtract
* this value for each packet from the octet count sent.
*/
highest = LINK_HIGHQ(l);
*pkts = *octets = 0;
for (queue = l->Queue; queue < highest; queue++) {
len = queue->len;
*pkts += len;
for (m = queue->top; len--; m = m->m_nextpkt)
*octets += m_length(m) - m->priv;
}
}
struct mbuf *
link_Dequeue(struct link *l)
{
int pri;
struct mbuf *bp;
for (bp = NULL, pri = LINK_QUEUES(l) - 1; pri >= 0; pri--)
if (l->Queue[pri].len) {
bp = m_dequeue(l->Queue + pri);
log_Printf(LogDEBUG, "link_Dequeue: Dequeued from queue %d,"
" containing %lu more packets\n", pri,
(u_long)l->Queue[pri].len);
break;
}
return bp;
}
static struct protostatheader {
u_short number;
const char *name;
} ProtocolStat[NPROTOSTAT] = {
{ PROTO_IP, "IP" },
{ PROTO_VJUNCOMP, "VJ_UNCOMP" },
{ PROTO_VJCOMP, "VJ_COMP" },
{ PROTO_COMPD, "COMPD" },
{ PROTO_ICOMPD, "ICOMPD" },
{ PROTO_LCP, "LCP" },
{ PROTO_IPCP, "IPCP" },
{ PROTO_CCP, "CCP" },
{ PROTO_PAP, "PAP" },
{ PROTO_LQR, "LQR" },
{ PROTO_CHAP, "CHAP" },
{ PROTO_MP, "MULTILINK" },
{ 0, "Others" } /* must be last */
};
void
link_ProtocolRecord(struct link *l, u_short proto, int type)
{
int i;
for (i = 0; i < NPROTOSTAT; i++)
if (ProtocolStat[i].number == proto || ProtocolStat[i].number == 0) {
if (type == PROTO_IN)
l->proto_in[i]++;
else
l->proto_out[i]++;
break;
}
}
void
link_ReportProtocolStatus(struct link *l, struct prompt *prompt)
{
int i;
prompt_Printf(prompt, " Protocol in out "
"Protocol in out\n");
for (i = 0; i < NPROTOSTAT; i++) {
prompt_Printf(prompt, " %-9s: %8lu, %8lu",
ProtocolStat[i].name, l->proto_in[i], l->proto_out[i]);
if ((i % 2) == 0)
prompt_Printf(prompt, "\n");
}
if (!(i % 2))
prompt_Printf(prompt, "\n");
}
void
link_PushPacket(struct link *l, struct mbuf *bp, struct bundle *b, int pri,
u_short proto)
{
int layer;
/*
* When we ``push'' a packet into the link, it gets processed by the
* ``push'' function in each layer starting at the top.
* We never expect the result of a ``push'' to be more than one
* packet (as we do with ``pull''s).
*/
if(pri < 0 || (unsigned)pri >= LINK_QUEUES(l))
pri = 0;
bp->priv = 0; /* Adjusted by the async layer ! */
for (layer = l->nlayers; layer && bp; layer--)
if (l->layer[layer - 1]->push != NULL)
bp = (*l->layer[layer - 1]->push)(b, l, bp, pri, &proto);
if (bp) {
link_AddOutOctets(l, m_length(bp));
log_Printf(LogDEBUG, "link_PushPacket: Transmit proto 0x%04x\n", proto);
m_enqueue(l->Queue + pri, m_pullup(bp));
}
}
void
link_PullPacket(struct link *l, char *buf, size_t len, struct bundle *b)
{
struct mbuf *bp, *lbp[LAYER_MAX], *next;
u_short lproto[LAYER_MAX], proto;
int layer;
/*
* When we ``pull'' a packet from the link, it gets processed by the
* ``pull'' function in each layer starting at the bottom.
* Each ``pull'' may produce multiple packets, chained together using
* bp->m_nextpkt.
* Each packet that results from each pull has to be pulled through
* all of the higher layers before the next resulting packet is pulled
* through anything; this ensures that packets that depend on the
* fsm state resulting from the receipt of the previous packet aren't
* surprised.
*/
link_AddInOctets(l, len);
memset(lbp, '\0', sizeof lbp);
lbp[0] = m_get(len, MB_UNKNOWN);
memcpy(MBUF_CTOP(lbp[0]), buf, len);
lproto[0] = 0;
layer = 0;
while (layer || lbp[layer]) {
if (lbp[layer] == NULL) {
layer--;
continue;
}
bp = lbp[layer];
lbp[layer] = bp->m_nextpkt;
bp->m_nextpkt = NULL;
proto = lproto[layer];
if (l->layer[layer]->pull != NULL)
bp = (*l->layer[layer]->pull)(b, l, bp, &proto);
if (layer == l->nlayers - 1) {
/* We've just done the top layer, despatch the packet(s) */
while (bp) {
next = bp->m_nextpkt;
bp->m_nextpkt = NULL;
log_Printf(LogDEBUG, "link_PullPacket: Despatch proto 0x%04x\n", proto);
Despatch(b, l, bp, proto);
bp = next;
}
} else {
lbp[++layer] = bp;
lproto[layer] = proto;
}
}
}
int
link_Stack(struct link *l, struct layer *layer)
{
if (l->nlayers == sizeof l->layer / sizeof l->layer[0]) {
log_Printf(LogERROR, "%s: Oops, cannot stack a %s layer...\n",
l->name, layer->name);
return 0;
}
l->layer[l->nlayers++] = layer;
return 1;
}
void
link_EmptyStack(struct link *l)
{
l->nlayers = 0;
}
static const struct {
u_short proto;
struct mbuf *(*fn)(struct bundle *, struct link *, struct mbuf *);
} despatcher[] = {
{ PROTO_IP, ipv4_Input },
#ifndef NOINET6
{ PROTO_IPV6, ipv6_Input },
#endif
{ PROTO_MP, mp_Input },
{ PROTO_LCP, lcp_Input },
{ PROTO_IPCP, ipcp_Input },
#ifndef NOINET6
{ PROTO_IPV6CP, ipv6cp_Input },
#endif
{ PROTO_PAP, pap_Input },
{ PROTO_CHAP, chap_Input },
{ PROTO_CCP, ccp_Input },
{ PROTO_LQR, lqr_Input },
{ PROTO_CBCP, cbcp_Input }
};
#define DSIZE (sizeof despatcher / sizeof despatcher[0])
static void
Despatch(struct bundle *bundle, struct link *l, struct mbuf *bp, u_short proto)
{
unsigned f;
for (f = 0; f < DSIZE; f++)
if (despatcher[f].proto == proto) {
bp = (*despatcher[f].fn)(bundle, l, bp);
break;
}
if (bp) {
struct physical *p = link2physical(l);
log_Printf(LogPHASE, "%s protocol 0x%04x (%s)\n",
f == DSIZE ? "Unknown" : "Unexpected", proto,
hdlc_Protocol2Nam(proto));
bp = m_pullup(proto_Prepend(bp, proto, 0, 0));
lcp_SendProtoRej(&l->lcp, MBUF_CTOP(bp), bp->m_len);
if (p) {
p->hdlc.lqm.ifInDiscards++;
p->hdlc.stats.unknownproto++;
}
m_freem(bp);
}
}
int
link_ShowLayers(struct cmdargs const *arg)
{
struct link *l = command_ChooseLink(arg);
int layer;
for (layer = l->nlayers; layer; layer--)
prompt_Printf(arg->prompt, "%s%s", layer == l->nlayers ? "" : ", ",
l->layer[layer - 1]->name);
if (l->nlayers)
prompt_Printf(arg->prompt, "\n");
return 0;
}
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