b817fe9eca
ethernet (tested) and FDDI (not tested). The main use for this is on ADSL (or other ATM) connections where bridged ethernet is used, PPPoE being a prime example. There is no manual page as yet, I will write one shortly. Reviewed by: harti
279 lines
6.9 KiB
C
279 lines
6.9 KiB
C
/*
|
|
* Copyright (c) 2003-2004 Benno Rice <benno@eloquent.com.au>
|
|
* 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 ``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 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/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
|
|
#include <netgraph/ng_message.h>
|
|
#include <netgraph/netgraph.h>
|
|
#include <netgraph/ng_atmllc.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/ethernet.h> /* for M_HASFCS and ETHER_HDR_LEN */
|
|
#include <net/if_atm.h> /* for struct atmllc */
|
|
|
|
#define NG_ATMLLC_HEADER "\252\252\3\0\200\302"
|
|
#define NG_ATMLLC_HEADER_LEN (sizeof(struct atmllc))
|
|
#define NG_ATMLLC_TYPE_ETHERNET_FCS 0x0001
|
|
#define NG_ATMLLC_TYPE_FDDI_FCS 0x0004
|
|
#define NG_ATMLLC_TYPE_ETHERNET_NOFCS 0x0007
|
|
#define NG_ATMLLC_TYPE_FDDI_NOFCS 0x000A
|
|
|
|
struct ng_atmllc_priv {
|
|
hook_p atm;
|
|
hook_p ether;
|
|
hook_p fddi;
|
|
};
|
|
|
|
/* Netgraph methods. */
|
|
static ng_constructor_t ng_atmllc_constructor;
|
|
static ng_shutdown_t ng_atmllc_shutdown;
|
|
static ng_rcvmsg_t ng_atmllc_rcvmsg;
|
|
static ng_newhook_t ng_atmllc_newhook;
|
|
static ng_rcvdata_t ng_atmllc_rcvdata;
|
|
static ng_disconnect_t ng_atmllc_disconnect;
|
|
|
|
static struct ng_type ng_atmllc_typestruct = {
|
|
NG_ABI_VERSION,
|
|
NG_ATMLLC_NODE_TYPE,
|
|
NULL,
|
|
ng_atmllc_constructor,
|
|
ng_atmllc_rcvmsg,
|
|
ng_atmllc_shutdown,
|
|
ng_atmllc_newhook,
|
|
NULL,
|
|
NULL,
|
|
ng_atmllc_rcvdata,
|
|
ng_atmllc_disconnect,
|
|
NULL
|
|
};
|
|
NETGRAPH_INIT(atmllc, &ng_atmllc_typestruct);
|
|
|
|
static int
|
|
ng_atmllc_constructor(node_p node)
|
|
{
|
|
struct ng_atmllc_priv *priv;
|
|
|
|
MALLOC(priv, struct ng_atmllc_priv *, sizeof(*priv), M_NETGRAPH,
|
|
M_NOWAIT | M_ZERO);
|
|
if (priv == NULL) {
|
|
return (ENOMEM);
|
|
}
|
|
|
|
NG_NODE_SET_PRIVATE(node, priv);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ng_atmllc_rcvmsg(node_p node, item_p item, hook_p lasthook)
|
|
{
|
|
struct ng_mesg *msg;
|
|
int error;
|
|
|
|
error = 0;
|
|
NGI_GET_MSG(item, msg);
|
|
msg->header.flags |= NGF_RESP;
|
|
NG_RESPOND_MSG(error, node, item, msg);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ng_atmllc_shutdown(node_p node)
|
|
{
|
|
struct ng_atmllc_priv *priv;
|
|
|
|
priv = NG_NODE_PRIVATE(node);
|
|
|
|
FREE(priv, M_NETGRAPH);
|
|
|
|
NG_NODE_UNREF(node);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ng_atmllc_newhook(node_p node, hook_p hook, const char *name)
|
|
{
|
|
struct ng_atmllc_priv *priv;
|
|
|
|
priv = NG_NODE_PRIVATE(node);
|
|
|
|
if (strcmp(name, NG_ATMLLC_HOOK_ATM) == 0) {
|
|
if (priv->atm != NULL) {
|
|
return (EISCONN);
|
|
}
|
|
priv->atm = hook;
|
|
} else if (strcmp(name, NG_ATMLLC_HOOK_ETHER) == 0) {
|
|
if (priv->ether != NULL) {
|
|
return (EISCONN);
|
|
}
|
|
priv->ether = hook;
|
|
} else if (strcmp(name, NG_ATMLLC_HOOK_FDDI) == 0) {
|
|
if (priv->fddi != NULL) {
|
|
return (EISCONN);
|
|
}
|
|
priv->fddi = hook;
|
|
} else {
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ng_atmllc_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
struct ng_atmllc_priv *priv;
|
|
struct mbuf *m;
|
|
struct atmllc *hdr;
|
|
hook_p outhook;
|
|
u_int padding;
|
|
int error;
|
|
|
|
priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
m = NGI_M(item);
|
|
outhook = NULL;
|
|
padding = 0;
|
|
|
|
if (hook == priv->atm) {
|
|
/* Ditch the psuedoheader. */
|
|
hdr = mtod(m, struct atmllc *);
|
|
/* m_adj(m, sizeof(struct atm_pseudohdr)); */
|
|
|
|
/*
|
|
* Make sure we have the LLC and ethernet headers.
|
|
* The ethernet header size is slightly larger than the FDDI
|
|
* header, which is convenient.
|
|
*/
|
|
if (m->m_len < sizeof(struct atmllc) + ETHER_HDR_LEN) {
|
|
m = m_pullup(m, sizeof(struct atmllc) + ETHER_HDR_LEN);
|
|
if (m == NULL) {
|
|
return (ENOMEM);
|
|
}
|
|
}
|
|
|
|
/* Decode the LLC header. */
|
|
hdr = mtod(m, struct atmllc *);
|
|
if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_ETHERNET_NOFCS) {
|
|
m->m_flags &= ~M_HASFCS;
|
|
outhook = priv->ether;
|
|
padding = 2;
|
|
} else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_ETHERNET_FCS) {
|
|
m->m_flags |= M_HASFCS;
|
|
outhook = priv->ether;
|
|
padding = 2;
|
|
} else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_FDDI_NOFCS) {
|
|
m->m_flags &= ~M_HASFCS;
|
|
outhook = priv->fddi;
|
|
padding = 3;
|
|
} else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_FDDI_FCS) {
|
|
m->m_flags |= M_HASFCS;
|
|
outhook = priv->fddi;
|
|
padding = 3;
|
|
} else {
|
|
printf("ng_atmllc: unknown type: %x\n",
|
|
ATM_LLC_TYPE(hdr));
|
|
}
|
|
|
|
/* Remove the LLC header and any padding*/
|
|
m_adj(m, sizeof(struct atmllc) + padding);
|
|
} else if (hook == priv->ether) {
|
|
/* Add the LLC header */
|
|
M_PREPEND(m, NG_ATMLLC_HEADER_LEN + 2, M_DONTWAIT);
|
|
if (m == NULL) {
|
|
printf("ng_atmllc: M_PREPEND failed\n");
|
|
NG_FREE_ITEM(item);
|
|
return (ENOMEM);
|
|
}
|
|
hdr = mtod(m, struct atmllc *);
|
|
bzero((void *)hdr, sizeof(struct atmllc) + 2);
|
|
bcopy(NG_ATMLLC_HEADER, hdr->llchdr, 6);
|
|
if ((m->m_flags & M_HASFCS) != 0) {
|
|
ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_ETHERNET_FCS);
|
|
} else {
|
|
ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_ETHERNET_NOFCS);
|
|
}
|
|
outhook = priv->atm;
|
|
} else if (hook == priv->fddi) {
|
|
/* Add the LLC header */
|
|
M_PREPEND(m, NG_ATMLLC_HEADER_LEN + 3, M_DONTWAIT);
|
|
if (m == NULL) {
|
|
printf("ng_atmllc: M_PREPEND failed\n");
|
|
NG_FREE_ITEM(item);
|
|
return (ENOMEM);
|
|
}
|
|
hdr = mtod(m, struct atmllc *);
|
|
bzero((void *)hdr, sizeof(struct atmllc) + 3);
|
|
bcopy(NG_ATMLLC_HEADER, hdr->llchdr, 6);
|
|
if ((m->m_flags & M_HASFCS) != 0) {
|
|
ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_FDDI_FCS);
|
|
} else {
|
|
ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_FDDI_NOFCS);
|
|
}
|
|
outhook = priv->atm;
|
|
}
|
|
|
|
if (outhook == NULL) {
|
|
NG_FREE_ITEM(item);
|
|
return (0);
|
|
}
|
|
|
|
NG_FWD_NEW_DATA(error, item, outhook, m);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ng_atmllc_disconnect(hook_p hook)
|
|
{
|
|
node_p node;
|
|
struct ng_atmllc_priv *priv;
|
|
|
|
node = NG_HOOK_NODE(hook);
|
|
priv = NG_NODE_PRIVATE(node);
|
|
|
|
if (hook == priv->atm) {
|
|
priv->atm = NULL;
|
|
} else if (hook == priv->ether) {
|
|
priv->ether = NULL;
|
|
} else if (hook == priv->fddi) {
|
|
priv->fddi = NULL;
|
|
}
|
|
|
|
if (NG_NODE_NUMHOOKS(node) == 0 && NG_NODE_IS_VALID(node)) {
|
|
ng_rmnode_self(node);
|
|
}
|
|
|
|
return (0);
|
|
}
|