freebsd-dev/usr.sbin/ppp/link.c

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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.
*
1999-08-28 01:35:59 +00:00
* $FreeBSD$
*
*/
#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>
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#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"
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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#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)
{
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unsigned i;
size_t len;
for (i = 0, len = 0; i < LINK_QUEUES(l); i++)
len += l->Queue[i].len;
return len;
}
size_t
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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link_QueueBytes(struct link *l)
{
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unsigned i;
size_t len, bytes;
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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struct mbuf *m;
bytes = 0;
for (i = 0, len = 0; i < LINK_QUEUES(l); i++) {
len = l->Queue[i].len;
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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m = l->Queue[i].top;
while (len--) {
bytes += m_length(m);
m = m->m_nextpkt;
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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}
}
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" },
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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{ PROTO_MP, "MULTILINK" },
{ 0, "Others" }
};
void
link_ProtocolRecord(struct link *l, u_short proto, int type)
{
int i;
for (i = 0; i < NPROTOSTAT; i++)
if (ProtocolStat[i].number == proto)
break;
if (type == PROTO_IN)
l->proto_in[i]++;
else
l->proto_out[i]++;
}
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");
}
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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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).
*/
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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));
Allow ``host:port/udp'' devices and support ``host:port/tcp'' as being the same as the previous (still supported) ``host:port'' syntax for tcp socket devices. A udp device uses synchronous ppp rather than async, and avoids the double-retransmit overhead that comes with ppp over tcp (it's usually a bad idea to transport IP over a reliable transport that itself is using an unreliable transport). PPP over UDP provides througput of ** 1.5Mb per second ** with all compression disabled, maxing out a PPro/200 when running ppp twice, back-to-back. This proves that PPPoE is plausable in userland.... This change adds a few more handler functions to struct device and allows derivations of struct device (which may contain their own data etc) to pass themselves through the unix domain socket for MP. ** At last **, struct physical has lost all the tty crud ! iov2physical() is now smart enough to restore the correct stack of layers so that MP servers will work again. The version number has bumped as our MP link transfer contents have changed (they now may contain a `struct device'). Don't extract the protocol twice in MP mode (resulting in protocol rejects for every MP packet). This was broken with my original layering changes. Add ``Physical'' and ``Sync'' log levels for logging the relevent raw packets and add protocol-tracking LogDEBUG stuff in various LayerPush & LayerPull functions. Assign our physical device name for incoming tcp connections by calling getpeername(). Assign our physical device name for incoming udp connections from the address retrieved by the first recvfrom().
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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;
Allow ``host:port/udp'' devices and support ``host:port/tcp'' as being the same as the previous (still supported) ``host:port'' syntax for tcp socket devices. A udp device uses synchronous ppp rather than async, and avoids the double-retransmit overhead that comes with ppp over tcp (it's usually a bad idea to transport IP over a reliable transport that itself is using an unreliable transport). PPP over UDP provides througput of ** 1.5Mb per second ** with all compression disabled, maxing out a PPro/200 when running ppp twice, back-to-back. This proves that PPPoE is plausable in userland.... This change adds a few more handler functions to struct device and allows derivations of struct device (which may contain their own data etc) to pass themselves through the unix domain socket for MP. ** At last **, struct physical has lost all the tty crud ! iov2physical() is now smart enough to restore the correct stack of layers so that MP servers will work again. The version number has bumped as our MP link transfer contents have changed (they now may contain a `struct device'). Don't extract the protocol twice in MP mode (resulting in protocol rejects for every MP packet). This was broken with my original layering changes. Add ``Physical'' and ``Sync'' log levels for logging the relevent raw packets and add protocol-tracking LogDEBUG stuff in various LayerPush & LayerPull functions. Assign our physical device name for incoming tcp connections by calling getpeername(). Assign our physical device name for incoming udp connections from the address retrieved by the first recvfrom().
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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)
{
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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;
}