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Add a netgraph node to handle ATM LLC encapsulation. This currently handles

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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
This commit is contained in:
Benno Rice 2004-03-08 10:54:35 +00:00
parent a062038267
commit bde778e9f2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=126742
6 changed files with 332 additions and 0 deletions
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1
sys/conf/NOTES
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@ -409,6 +409,7 @@ options LIBMCHAIN
# corresponding man page, e.g., ng_async(8).
options NETGRAPH #netgraph(4) system
options NETGRAPH_ASYNC
options NETGRAPH_ATMLLC
options NETGRAPH_BPF
options NETGRAPH_BRIDGE
options NETGRAPH_CISCO

1
sys/conf/files
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@ -1402,6 +1402,7 @@ contrib/ngatm/netnatm/sig/sig_unimsgcpy.c optional ngatm_uni
contrib/ngatm/netnatm/sig/sig_verify.c optional ngatm_uni
netgraph/ng_UI.c optional netgraph_UI
netgraph/ng_async.c optional netgraph_async
netgraph/ng_atmllc.c optional netgraph_atmllc
netgraph/ng_base.c optional netgraph
netgraph/ng_bpf.c optional netgraph_bpf
net/bpf_filter.c optional netgraph_bpf

1
sys/conf/options
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@ -376,6 +376,7 @@ XBONEHACK
# option below. Each type has its own man page, e.g. ng_async(4).
NETGRAPH
NETGRAPH_ASYNC opt_netgraph.h
NETGRAPH_ATMLLC opt_netgraph.h
NETGRAPH_BPF opt_netgraph.h
NETGRAPH_BRIDGE opt_netgraph.h
NETGRAPH_CISCO opt_netgraph.h

6
sys/modules/netgraph/atmllc/Makefile Normal file
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@ -0,0 +1,6 @@
# $FreeBSD$
KMOD= ng_atmllc
SRCS= ng_atmllc.c
.include <bsd.kmod.mk>

278
sys/netgraph/ng_atmllc.c Normal file
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@ -0,0 +1,278 @@
/*
* 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);
}

45
sys/netgraph/ng_atmllc.h Normal file
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@ -0,0 +1,45 @@
/*
* Copyright (c) 2003-2004 Benno Rice <benno@FreeBSD.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 ``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.
*
* $FreeBSD$
*/
#ifndef _NETGRAPH_ATMLLC_H_
#define _NETGRAPH_ATMLLC_H_
/* Node type name and magic cookie. */
#define NG_ATMLLC_NODE_TYPE "atmllc"
#define NGM_ATMLLC_COOKIE 1065246274
/* Hook names. */
#define NG_ATMLLC_HOOK_ATM "atm"
#define NG_ATMLLC_HOOK_ETHER "ether"
#define NG_ATMLLC_HOOK_802_4 "ieee8024"
#define NG_ATMLLC_HOOK_802_5 "ieee8025"
#define NG_ATMLLC_HOOK_802_6 "ieee8026"
#define NG_ATMLLC_HOOK_FDDI "fddi"
#define NG_ATMLLC_HOOK_BPDU "bpdu"
#endif /* _NETGRAPH_ATMLLC_H_ */