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freebsd-nq/usr.sbin/ppp/ether.c
Brian Somers c8b9fb53a1 Handle hardware-imposed MTU/MRU limitations. PPPoE will no longer 
allow MRU/MTU negotiations to exceed 1492.

Add an optional ``max'' specifier to ``set m[rt]u'', ie.

	set mtu max 1480

Bump the ppp version number.

Sponsored by:	Monzoon Networks AG and FreeBSD Services Limited
2001-06-18 14:59:36 +00:00

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/*-
* Copyright (c) 1999 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>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netgraph.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netgraph/ng_ether.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_pppoe.h>
#include <netgraph/ng_socket.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <sys/fcntl.h>
#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
#include <sys/linker.h>
#include <sys/module.h>
#endif
#include <sys/stat.h>
#include <sys/uio.h>
#include <termios.h>
#include <sys/time.h>
#include <unistd.h>
#include "layer.h"
#include "defs.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "lqr.h"
#include "hdlc.h"
#include "throughput.h"
#include "fsm.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "async.h"
#include "descriptor.h"
#include "physical.h"
#include "main.h"
#include "mp.h"
#include "chat.h"
#include "auth.h"
#include "chap.h"
#include "cbcp.h"
#include "datalink.h"
#include "slcompress.h"
#include "iplist.h"
#include "ipcp.h"
#include "filter.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "bundle.h"
#include "id.h"
#include "iface.h"
#include "ether.h"
#define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */
struct etherdevice {
struct device dev; /* What struct physical knows about */
int cs; /* Control socket */
int connected; /* Are we connected yet ? */
int timeout; /* Seconds attempting to connect */
char hook[sizeof TUN_NAME + 11]; /* Our socket node hook */
};
#define device2ether(d) \
((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL)
int
ether_DeviceSize(void)
{
return sizeof(struct etherdevice);
}
static ssize_t
ether_Write(struct physical *p, const void *v, size_t n)
{
struct etherdevice *dev = device2ether(p->handler);
return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : n;
}
static ssize_t
ether_Read(struct physical *p, void *v, size_t n)
{
char hook[sizeof TUN_NAME + 11];
return NgRecvData(p->fd, v, n, hook);
}
static int
ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
{
struct etherdevice *dev = device2ether(p->handler);
int result;
if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
FD_CLR(dev->cs, r);
log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
result = 1;
} else
result = 0;
/* Careful... physical_RemoveFromSet() called us ! */
p->handler->removefromset = NULL;
result += physical_RemoveFromSet(p, r, w, e);
p->handler->removefromset = ether_RemoveFromSet;
return result;
}
static void
ether_Free(struct physical *p)
{
struct etherdevice *dev = device2ether(p->handler);
physical_SetDescriptor(p);
if (dev->cs != -1)
close(dev->cs);
free(dev);
}
static const char *
ether_OpenInfo(struct physical *p)
{
struct etherdevice *dev = device2ether(p->handler);
switch (dev->connected) {
case CARRIER_PENDING:
return "negotiating";
case CARRIER_OK:
return "established";
}
return "disconnected";
}
static void
ether_device2iov(struct device *d, struct iovec *iov, int *niov,
int maxiov, int *auxfd, int *nauxfd)
{
struct etherdevice *dev = device2ether(d);
int sz = physical_MaxDeviceSize();
iov[*niov].iov_base = realloc(d, sz);
if (iov[*niov].iov_base == NULL) {
log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
AbortProgram(EX_OSERR);
}
iov[*niov].iov_len = sz;
(*niov)++;
if (dev->cs >= 0) {
*auxfd = dev->cs;
(*nauxfd)++;
}
}
static void
ether_MessageIn(struct etherdevice *dev)
{
char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
char unknown[14];
const char *msg;
struct timeval t;
fd_set *r;
int ret;
if (dev->cs < 0)
return;
if ((r = mkfdset()) == NULL) {
log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
return;
}
zerofdset(r);
FD_SET(dev->cs, r);
t.tv_sec = t.tv_usec = 0;
ret = select(dev->cs + 1, r, NULL, NULL, &t);
free(r);
if (ret <= 0)
return;
if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) < 0)
return;
if (rep->header.version != NG_VERSION) {
log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n",
(long)rep->header.version, (long)NG_VERSION);
return;
}
if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n",
(long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
return;
}
switch (rep->header.cmd) {
case NGM_PPPOE_SET_FLAG: msg = "SET_FLAG"; break;
case NGM_PPPOE_CONNECT: msg = "CONNECT"; break;
case NGM_PPPOE_LISTEN: msg = "LISTEN"; break;
case NGM_PPPOE_OFFER: msg = "OFFER"; break;
case NGM_PPPOE_SUCCESS: msg = "SUCCESS"; break;
case NGM_PPPOE_FAIL: msg = "FAIL"; break;
case NGM_PPPOE_CLOSE: msg = "CLOSE"; break;
case NGM_PPPOE_GET_STATUS: msg = "GET_STATUS"; break;
default:
snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
msg = unknown;
break;
}
log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%s\")\n", msg, sts->hook);
switch (rep->header.cmd) {
case NGM_PPPOE_SUCCESS:
dev->connected = CARRIER_OK;
break;
case NGM_PPPOE_FAIL:
case NGM_PPPOE_CLOSE:
dev->connected = CARRIER_LOST;
break;
}
}
static int
ether_AwaitCarrier(struct physical *p)
{
struct etherdevice *dev = device2ether(p->handler);
if (dev->connected != CARRIER_OK && !dev->timeout--)
dev->connected = CARRIER_LOST;
else if (dev->connected == CARRIER_PENDING)
ether_MessageIn(dev);
return dev->connected;
}
static const struct device baseetherdevice = {
ETHER_DEVICE,
"ether",
1492,
{ CD_REQUIRED, DEF_ETHERCDDELAY },
ether_AwaitCarrier,
ether_RemoveFromSet,
NULL,
NULL,
NULL,
NULL,
ether_Free,
ether_Read,
ether_Write,
ether_device2iov,
NULL,
ether_OpenInfo
};
struct device *
ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
int maxiov, int *auxfd, int *nauxfd)
{
if (type == ETHER_DEVICE) {
struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base;
dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */
if (dev == NULL) {
log_Printf(LogALERT, "Failed to allocate memory: %d\n",
(int)(sizeof *dev));
AbortProgram(EX_OSERR);
}
if (*nauxfd) {
dev->cs = *auxfd;
(*nauxfd)--;
} else
dev->cs = -1;
/* Refresh function pointers etc */
memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
return &dev->dev;
}
return NULL;
}
static int
ether_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
{
struct physical *p = descriptor2physical(d);
struct etherdevice *dev = device2ether(p->handler);
int result;
if (r && dev->cs >= 0) {
FD_SET(dev->cs, r);
log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs);
result = 1;
} else
result = 0;
result += physical_doUpdateSet(d, r, w, e, n, 0);
return result;
}
static int
ether_IsSet(struct fdescriptor *d, const fd_set *fdset)
{
struct physical *p = descriptor2physical(d);
struct etherdevice *dev = device2ether(p->handler);
int result;
result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset);
result += physical_IsSet(d, fdset);
return result;
}
static void
ether_DescriptorRead(struct fdescriptor *d, struct bundle *bundle,
const fd_set *fdset)
{
struct physical *p = descriptor2physical(d);
struct etherdevice *dev = device2ether(p->handler);
if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) {
ether_MessageIn(dev);
if (dev->connected == CARRIER_LOST) {
log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name);
datalink_Down(p->dl, CLOSE_NORMAL);
return;
}
}
if (physical_IsSet(d, fdset))
physical_DescriptorRead(d, bundle, fdset);
}
static struct device *
ether_Abandon(struct etherdevice *dev, struct physical *p)
{
/* Abandon our node construction */
close(dev->cs);
close(p->fd);
p->fd = -2; /* Nobody else need try.. */
free(dev);
return NULL;
}
struct device *
ether_Create(struct physical *p)
{
u_char rbuf[2048];
struct etherdevice *dev;
struct ng_mesg *resp;
const struct hooklist *hlist;
const struct nodeinfo *ninfo;
char *path;
int ifacelen, f;
dev = NULL;
path = NULL;
ifacelen = 0;
if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE,
PPPOE_NODE_TYPE_LEN) &&
p->name.full[PPPOE_NODE_TYPE_LEN] == ':') {
const struct linkinfo *nlink;
struct ngpppoe_init_data *data;
struct ngm_mkpeer mkp;
struct ngm_connect ngc;
const char *iface, *provider;
char etherid[12];
int providerlen;
char connectpath[sizeof dev->hook + 2]; /* .:<hook> */
p->fd--; /* We own the device - change fd */
#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
if (modfind("netgraph") == -1 && ID0kldload("netgraph") == -1) {
log_Printf(LogWARN, "kldload: netgraph: %s\n", strerror(errno));
return NULL;
}
if (modfind("ng_ether") == -1 && ID0kldload("ng_ether") == -1)
/*
* Don't treat this as an error as older kernels have this stuff
* built in as part of the netgraph node itself.
*/
log_Printf(LogWARN, "kldload: ng_ether: %s\n", strerror(errno));
if (modfind("ng_pppoe") == -1 && ID0kldload("ng_pppoe") == -1) {
log_Printf(LogWARN, "kldload: ng_pppoe: %s\n", strerror(errno));
return NULL;
}
if (modfind("ng_socket") == -1 && ID0kldload("ng_socket") == -1) {
log_Printf(LogWARN, "kldload: ng_socket: %s\n", strerror(errno));
return NULL;
}
#endif
if ((dev = malloc(sizeof *dev)) == NULL)
return NULL;
iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1;
provider = strchr(iface, ':');
if (provider) {
ifacelen = provider - iface;
provider++;
providerlen = strlen(provider);
} else {
ifacelen = strlen(iface);
provider = "";
providerlen = 0;
}
/*
* We're going to do this (where tunN is our tunnel device):
*
* .---------.
* | ether |
* | <iface> | dev->cs
* `---------' |
* (orphan) p->fd |
* | | |
* | | |
* (ethernet) | |
* .---------. .-----------.
* | pppoe | | socket |
* | <iface> |(tunN)<---->(tunN)| <unnamed> |
* `--------- `-----------'
* (tunX)
* ^
* |
* `--->(tunX)
*/
/* Create a socket node */
if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
strerror(errno));
free(dev);
return NULL;
}
/*
* Ask for a list of hooks attached to the "ether" node. This node should
* magically exist as a way of hooking stuff onto an ethernet device
*/
path = (char *)alloca(ifacelen + 2);
sprintf(path, "%.*s:", ifacelen, iface);
if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
NULL, 0) < 0) {
log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n",
path, strerror(errno));
return ether_Abandon(dev, p);
}
/* Get our list back */
resp = (struct ng_mesg *)rbuf;
if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) < 0) {
log_Printf(LogWARN, "Cannot get netgraph response: %s\n",
strerror(errno));
return ether_Abandon(dev, p);
}
hlist = (const struct hooklist *)resp->data;
ninfo = &hlist->nodeinfo;
/* Make sure we've got the right type of node */
if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE,
sizeof NG_ETHER_NODE_TYPE - 1)) {
log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``"
NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type);
return ether_Abandon(dev, p);
}
log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
path, ninfo->id);
/* look for a hook already attached. */
for (f = 0; f < ninfo->hooks; f++) {
nlink = &hlist->link[f];
log_Printf(LogDEBUG, " Found %s -> %s\n", nlink->ourhook,
nlink->peerhook);
if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
!strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
/*
* Something is using the data coming out of this ``ether'' node.
* If it's a PPPoE node, we use that node, otherwise we complain that
* someone else is using the node.
*/
if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE))
/* Use this PPPoE node ! */
snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id);
else {
log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n",
path, nlink->nodeinfo.type);
return ether_Abandon(dev, p);
}
break;
}
}
if (f == ninfo->hooks) {
/*
* Create a new ``PPPoE'' node connected to the ``ether'' node using
* the magic ``orphan'' and ``ethernet'' hooks
*/
snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id);
log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n",
etherid, mkp.ourhook, mkp.peerhook);
if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE,
NGM_MKPEER, &mkp, sizeof mkp) < 0) {
log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n",
etherid, strerror(errno));
return ether_Abandon(dev, p);
}
snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN);
}
snprintf(dev->hook, sizeof dev->hook, "%s%d",
TUN_NAME, p->dl->bundle->unit);
/*
* Connect the PPPoE node to our socket node.
* ngc.path has already been set up
*/
snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n",
ngc.ourhook, ngc.path, ngc.peerhook);
if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
NGM_CONNECT, &ngc, sizeof ngc) < 0) {
log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph "
"nodes: %s\n", strerror(errno));
return ether_Abandon(dev, p);
}
/* And finally, request a connection to the given provider */
data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen);
snprintf(data->hook, sizeof data->hook, "%s", dev->hook);
memcpy(data->data, provider, providerlen);
data->data_len = providerlen;
snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook);
log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath);
if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) {
log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n",
connectpath, strerror(errno));
return ether_Abandon(dev, p);
}
/* Hook things up so that we monitor dev->cs */
p->desc.UpdateSet = ether_UpdateSet;
p->desc.IsSet = ether_IsSet;
p->desc.Read = ether_DescriptorRead;
memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
switch (p->cfg.cd.necessity) {
case CD_VARIABLE:
dev->dev.cd.delay = p->cfg.cd.delay;
break;
case CD_REQUIRED:
dev->dev.cd = p->cfg.cd;
break;
case CD_NOTREQUIRED:
log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n",
p->link.name, dev->dev.cd.delay);
case CD_DEFAULT:
break;
}
dev->timeout = dev->dev.cd.delay;
dev->connected = CARRIER_PENDING;
} else {
/* See if we're a netgraph socket */
struct stat st;
if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
struct sockaddr_storage ssock;
struct sockaddr *sock = (struct sockaddr *)&ssock;
int sz;
sz = sizeof ssock;
if (getsockname(p->fd, sock, &sz) == -1) {
log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
close(p->fd);
p->fd = -1;
return NULL;
}
if (sock->sa_family == AF_NETGRAPH) {
/*
* It's a netgraph node... We can't determine hook names etc, so we
* stay pretty impartial....
*/
log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
if ((dev = malloc(sizeof *dev)) == NULL) {
log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
p->link.name, strerror(errno));
return NULL;
}
memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
dev->cs = -1;
dev->timeout = 0;
dev->connected = CARRIER_OK;
*dev->hook = '\0';
}
}
}
if (dev) {
physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
if (path != NULL) {
/* Mark the interface as UP if it's not already */
path[ifacelen] = '\0'; /* Remove the trailing ':' */
if (!iface_SetFlags(path, IFF_UP))
log_Printf(LogWARN, "%s: Failed to set the IFF_UP flag on %s\n",
p->link.name, path);
}
return &dev->dev;
}
return NULL;
}
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