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freebsd/sys/netgraph/ng_fec.c
Bill Paul 0aef141cd0 Attempt to make the ng_fec module play nice with BPF again. Things have 
changed since this code was written:

- The ng_ether_input_p hook only accepts two arguments now: the pointer
  to the ether header structure is gone.

- It's no longer necessary to cons up a fake ether header before passing
  incoming packets to BPF_MTAP().

ng_fec_input() has been modified to account for these two changes.
Running tcpdump on fec0 should work now.

PR:	kern/46720
2003-02-26 06:38:54 +00:00

1194 lines
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/*
* ng_fec.c
*
* Copyright (c) 2001 Berkeley Software Design, Inc.
* Copyright (c) 2000, 2001
* Bill Paul <wpaul@osd.bsdi.com>. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
* 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.
*
* $FreeBSD$
*/
/*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Archie Cobbs <archie@freebsd.org>
*
* $Whistle: ng_fec.c,v 1.33 1999/11/01 09:24:51 julian Exp $
*/
/*
* This module implements ethernet channel bonding using the Cisco
* Fast EtherChannel mechanism. Two or four ports may be combined
* into a single aggregate interface.
*
* Interfaces are named fec0, fec1, etc. New nodes take the
* first available interface name.
*
* This node also includes Berkeley packet filter support.
*
* Note that this node doesn't need to connect to any other
* netgraph nodes in order to do its work.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/sockio.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/libkern.h>
#include <sys/queue.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/intrq.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include "opt_inet.h"
#include "opt_inet6.h"
#include <netinet/in.h>
#ifdef INET
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#endif
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_fec.h>
#define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
#define FEC_INC(x, y) (x) = (x + 1) % y
/*
* Current fast etherchannel implementations use either 2 or 4
* ports, so for now we limit the maximum bundle size to 4 interfaces.
*/
#define FEC_BUNDLESIZ 4
struct ng_fec_portlist {
struct ifnet *fec_if;
int fec_idx;
int fec_ifstat;
struct ether_addr fec_mac;
TAILQ_ENTRY(ng_fec_portlist) fec_list;
};
struct ng_fec_bundle {
TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports;
int fec_ifcnt;
int fec_btype;
};
#define FEC_BTYPE_MAC 0x01
#define FEC_BTYPE_INET 0x02
#define FEC_BTYPE_INET6 0x03
/* Node private data */
struct ng_fec_private {
struct arpcom arpcom;
struct ifmedia ifmedia;
int if_flags;
int if_error; /* XXX */
int unit; /* Interface unit number */
node_p node; /* Our netgraph node */
struct ng_fec_bundle fec_bundle;/* Aggregate bundle */
struct callout_handle fec_ch; /* callout handle for ticker */
};
typedef struct ng_fec_private *priv_p;
/* Interface methods */
static void ng_fec_input(struct ifnet *, struct mbuf **);
static void ng_fec_start(struct ifnet *ifp);
static int ng_fec_choose_port(struct ng_fec_bundle *b,
struct mbuf *m, struct ifnet **ifp);
static int ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data);
static void ng_fec_init(void *arg);
static void ng_fec_stop(struct ifnet *ifp);
static int ng_fec_ifmedia_upd(struct ifnet *ifp);
static void ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
static int ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
static int ng_fec_output(struct ifnet *ifp, struct mbuf *m0,
struct sockaddr *dst, struct rtentry *rt0);
static void ng_fec_tick(void *arg);
static int ng_fec_addport(struct ng_fec_private *priv, char *iface);
static int ng_fec_delport(struct ng_fec_private *priv, char *iface);
#ifdef DEBUG
static void ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
#endif
/* ng_ether_input_p - see sys/netgraph/ng_ether.c */
extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
/* Netgraph methods */
static ng_constructor_t ng_fec_constructor;
static ng_rcvmsg_t ng_fec_rcvmsg;
static ng_shutdown_t ng_fec_shutdown;
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_fec_cmds[] = {
{
NGM_FEC_COOKIE,
NGM_FEC_ADD_IFACE,
"add_iface",
&ng_parse_string_type,
NULL,
},
{
NGM_FEC_COOKIE,
NGM_FEC_DEL_IFACE,
"del_iface",
&ng_parse_string_type,
NULL,
},
{
NGM_FEC_COOKIE,
NGM_FEC_SET_MODE_MAC,
"set_mode_mac",
NULL,
NULL,
},
{
NGM_FEC_COOKIE,
NGM_FEC_SET_MODE_INET,
"set_mode_inet",
NULL,
NULL,
},
{ 0 }
};
/* Node type descriptor */
static struct ng_type typestruct = {
NG_ABI_VERSION,
NG_FEC_NODE_TYPE,
NULL,
ng_fec_constructor,
ng_fec_rcvmsg,
ng_fec_shutdown,
NULL,
NULL,
NULL,
NULL,
NULL,
ng_fec_cmds
};
NETGRAPH_INIT(fec, &typestruct);
/* We keep a bitmap indicating which unit numbers are free.
One means the unit number is free, zero means it's taken. */
static int *ng_fec_units = NULL;
static int ng_fec_units_len = 0;
static int ng_units_in_use = 0;
#define UNITS_BITSPERWORD (sizeof(*ng_fec_units) * NBBY)
/*
* Find the first free unit number for a new interface.
* Increase the size of the unit bitmap as necessary.
*/
static __inline__ int
ng_fec_get_unit(int *unit)
{
int index, bit;
for (index = 0; index < ng_fec_units_len
&& ng_fec_units[index] == 0; index++);
if (index == ng_fec_units_len) { /* extend array */
int i, *newarray, newlen;
newlen = (2 * ng_fec_units_len) + 4;
MALLOC(newarray, int *, newlen * sizeof(*ng_fec_units),
M_NETGRAPH, M_NOWAIT);
if (newarray == NULL)
return (ENOMEM);
bcopy(ng_fec_units, newarray,
ng_fec_units_len * sizeof(*ng_fec_units));
for (i = ng_fec_units_len; i < newlen; i++)
newarray[i] = ~0;
if (ng_fec_units != NULL)
FREE(ng_fec_units, M_NETGRAPH);
ng_fec_units = newarray;
ng_fec_units_len = newlen;
}
bit = ffs(ng_fec_units[index]) - 1;
KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
("%s: word=%d bit=%d", __FUNCTION__, ng_fec_units[index], bit));
ng_fec_units[index] &= ~(1 << bit);
*unit = (index * UNITS_BITSPERWORD) + bit;
ng_units_in_use++;
return (0);
}
/*
* Free a no longer needed unit number.
*/
static __inline__ void
ng_fec_free_unit(int unit)
{
int index, bit;
index = unit / UNITS_BITSPERWORD;
bit = unit % UNITS_BITSPERWORD;
KASSERT(index < ng_fec_units_len,
("%s: unit=%d len=%d", __FUNCTION__, unit, ng_fec_units_len));
KASSERT((ng_fec_units[index] & (1 << bit)) == 0,
("%s: unit=%d is free", __FUNCTION__, unit));
ng_fec_units[index] |= (1 << bit);
/*
* XXX We could think about reducing the size of ng_fec_units[]
* XXX here if the last portion is all ones
* XXX At least free it if no more units
* Needed if we are to eventually be able to unload.
*/
ng_units_in_use--;
if (ng_units_in_use == 0) { /* XXX make SMP safe */
FREE(ng_fec_units, M_NETGRAPH);
ng_fec_units_len = 0;
ng_fec_units = NULL;
}
}
/************************************************************************
INTERFACE STUFF
************************************************************************/
static int
ng_fec_addport(struct ng_fec_private *priv, char *iface)
{
struct ng_fec_bundle *b;
struct ifnet *ifp, *bifp;
struct arpcom *ac;
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
struct ng_fec_portlist *p, *new;
if (priv == NULL || iface == NULL)
return(EINVAL);
b = &priv->fec_bundle;
ifp = &priv->arpcom.ac_if;
/* Find the interface */
bifp = ifunit(iface);
if (bifp == NULL) {
printf("fec%d: tried to add iface %s, which "
"doesn't seem to exist\n", priv->unit, iface);
return(ENOENT);
}
/* See if we have room in the bundle */
if (b->fec_ifcnt == FEC_BUNDLESIZ) {
printf("fec%d: can't add new iface; bundle is full\n",
priv->unit);
return(ENOSPC);
}
/* See if the interface is already in the bundle */
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
if (p->fec_if == bifp) {
printf("fec%d: iface %s is already in this "
"bundle\n", priv->unit, iface);
return(EINVAL);
}
}
/* Allocate new list entry. */
MALLOC(new, struct ng_fec_portlist *,
sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT);
if (new == NULL)
return(ENOMEM);
ac = (struct arpcom *)bifp;
ac->ac_netgraph = priv->node;
/*
* If this is the first interface added to the bundle,
* use its MAC address for the virtual interface (and,
* by extension, all the other ports in the bundle).
*/
if (b->fec_ifcnt == 0) {
ifa = TAILQ_FIRST(&ifp->if_addrhead);
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
bcopy((char *)ac->ac_enaddr,
priv->arpcom.ac_enaddr, ETHER_ADDR_LEN);
bcopy((char *)ac->ac_enaddr,
LLADDR(sdl), ETHER_ADDR_LEN);
}
b->fec_btype = FEC_BTYPE_MAC;
new->fec_idx = b->fec_ifcnt;
b->fec_ifcnt++;
/* Save the real MAC address. */
bcopy((char *)ac->ac_enaddr,
(char *)&new->fec_mac, ETHER_ADDR_LEN);
/* Set up phony MAC address. */
ifa = TAILQ_FIRST(&bifp->if_addrhead);
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
bcopy(priv->arpcom.ac_enaddr, ac->ac_enaddr, ETHER_ADDR_LEN);
bcopy(priv->arpcom.ac_enaddr, LLADDR(sdl), ETHER_ADDR_LEN);
/* Add to the queue */
new->fec_if = bifp;
TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list);
return(0);
}
static int
ng_fec_delport(struct ng_fec_private *priv, char *iface)
{
struct ng_fec_bundle *b;
struct ifnet *ifp, *bifp;
struct arpcom *ac;
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
struct ng_fec_portlist *p;
if (priv == NULL || iface == NULL)
return(EINVAL);
b = &priv->fec_bundle;
ifp = &priv->arpcom.ac_if;
/* Find the interface */
bifp = ifunit(iface);
if (bifp == NULL) {
printf("fec%d: tried to remove iface %s, which "
"doesn't seem to exist\n", priv->unit, iface);
return(ENOENT);
}
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
if (p->fec_if == bifp)
break;
}
if (p == NULL) {
printf("fec%d: tried to remove iface %s which "
"is not in our bundle\n", priv->unit, iface);
return(EINVAL);
}
/* Stop interface */
bifp->if_flags &= ~IFF_UP;
(*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
/* Restore MAC address. */
ac = (struct arpcom *)bifp;
ifa = TAILQ_FIRST(&bifp->if_addrhead);
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
bcopy((char *)&p->fec_mac, ac->ac_enaddr, ETHER_ADDR_LEN);
bcopy((char *)&p->fec_mac, LLADDR(sdl), ETHER_ADDR_LEN);
/* Delete port */
TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list);
FREE(p, M_NETGRAPH);
b->fec_ifcnt--;
return(0);
}
/*
* Pass an ioctl command down to all the underyling interfaces in a
* bundle. Used for setting multicast filters and flags.
*/
static int
ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data)
{
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
struct ifnet *oifp;
struct ng_fec_portlist *p;
priv = ifp->if_softc;
b = &priv->fec_bundle;
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
oifp = p->fec_if;
if (oifp != NULL)
(*oifp->if_ioctl)(oifp, command, data);
}
return(0);
}
static void
ng_fec_init(void *arg)
{
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
struct ifnet *ifp, *bifp;
struct ng_fec_portlist *p;
ifp = arg;
priv = ifp->if_softc;
b = &priv->fec_bundle;
if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
printf("fec%d: invalid bundle "
"size: %d\n", priv->unit,
b->fec_ifcnt);
return;
}
ng_fec_stop(ifp);
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
bifp = p->fec_if;
bifp->if_flags |= IFF_UP;
(*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
/* mark iface as up and let the monitor check it */
p->fec_ifstat = -1;
}
priv->fec_ch = timeout(ng_fec_tick, priv, hz);
return;
}
static void
ng_fec_stop(struct ifnet *ifp)
{
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
struct ifnet *bifp;
struct ng_fec_portlist *p;
priv = ifp->if_softc;
b = &priv->fec_bundle;
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
bifp = p->fec_if;
bifp->if_flags &= ~IFF_UP;
(*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
}
untimeout(ng_fec_tick, priv, priv->fec_ch);
return;
}
static void
ng_fec_tick(void *arg)
{
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
struct ifmediareq ifmr;
struct ifnet *ifp;
struct ng_fec_portlist *p;
int error = 0;
priv = arg;
b = &priv->fec_bundle;
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
bzero((char *)&ifmr, sizeof(ifmr));
ifp = p->fec_if;
error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
if (error) {
printf("fec%d: failed to check status "
"of link %s%d\n", priv->unit, ifp->if_name,
ifp->if_unit);
continue;
}
if (ifmr.ifm_status & IFM_AVALID &&
IFM_TYPE(ifmr.ifm_active) == IFM_ETHER) {
if (ifmr.ifm_status & IFM_ACTIVE) {
if (p->fec_ifstat == -1 ||
p->fec_ifstat == 0) {
p->fec_ifstat = 1;
printf("fec%d: port %s%d in bundle "
"is up\n", priv->unit,
ifp->if_name, ifp->if_unit);
}
} else {
if (p->fec_ifstat == -1 ||
p->fec_ifstat == 1) {
p->fec_ifstat = 0;
printf("fec%d: port %s%d in bundle "
"is down\n", priv->unit,
ifp->if_name, ifp->if_unit);
}
}
}
}
ifp = &priv->arpcom.ac_if;
if (ifp->if_flags & IFF_RUNNING)
priv->fec_ch = timeout(ng_fec_tick, priv, hz);
return;
}
static int
ng_fec_ifmedia_upd(struct ifnet *ifp)
{
return(0);
}
static void ng_fec_ifmedia_sts(struct ifnet *ifp,
struct ifmediareq *ifmr)
{
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
struct ng_fec_portlist *p;
priv = ifp->if_softc;
b = &priv->fec_bundle;
ifmr->ifm_status = IFM_AVALID;
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
if (p->fec_ifstat) {
ifmr->ifm_status |= IFM_ACTIVE;
break;
}
}
return;
}
/*
* Process an ioctl for the virtual interface
*/
static int
ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
struct ifreq *const ifr = (struct ifreq *) data;
int s, error = 0;
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
priv = ifp->if_softc;
b = &priv->fec_bundle;
#ifdef DEBUG
ng_fec_print_ioctl(ifp, command, data);
#endif
s = splimp();
switch (command) {
/* These two are mostly handled at a higher layer */
case SIOCSIFADDR:
case SIOCGIFADDR:
case SIOCSIFMTU:
error = ether_ioctl(ifp, command, data);
break;
/* Set flags */
case SIOCSIFFLAGS:
/*
* If the interface is marked up and stopped, then start it.
* If it is marked down and running, then stop it.
*/
if (ifr->ifr_flags & IFF_UP) {
if (!(ifp->if_flags & IFF_RUNNING)) {
/* Sanity. */
if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
printf("fec%d: invalid bundle "
"size: %d\n", priv->unit,
b->fec_ifcnt);
error = EINVAL;
break;
}
ifp->if_flags &= ~(IFF_OACTIVE);
ifp->if_flags |= IFF_RUNNING;
ng_fec_init(ifp);
}
/*
* Bubble down changes in promisc mode to
* underlying interfaces.
*/
if ((ifp->if_flags & IFF_PROMISC) !=
(priv->if_flags & IFF_PROMISC)) {
ng_fec_setport(ifp, command, data);
priv->if_flags = ifp->if_flags;
}
} else {
if (ifp->if_flags & IFF_RUNNING)
ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
ng_fec_stop(ifp);
}
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
ng_fec_setport(ifp, command, data);
error = 0;
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command);
break;
/* Stuff that's not supported */
case SIOCSIFPHYS:
error = EOPNOTSUPP;
break;
default:
error = EINVAL;
break;
}
(void) splx(s);
return (error);
}
/*
* This routine spies on mbufs passing through ether_input(). If
* they come from one of the interfaces that are aggregated into
* our bundle, we fix up the ifnet pointer and increment our
* packet counters so that it looks like the frames are actually
* coming from us.
*/
static void
ng_fec_input(struct ifnet *ifp, struct mbuf **m0)
{
struct ng_node *node;
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
struct mbuf *m;
struct ifnet *bifp;
struct ng_fec_portlist *p;
/* Sanity check */
if (ifp == NULL || m0 == NULL)
return;
node = IFP2NG(ifp);
/* Sanity check part II */
if (node == NULL)
return;
priv = NG_NODE_PRIVATE(node);
b = &priv->fec_bundle;
bifp = &priv->arpcom.ac_if;
m = *m0;
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
if (p->fec_if == m->m_pkthdr.rcvif)
break;
}
/* Wasn't meant for us; leave this frame alone. */
if (p == NULL)
return;
/* Pretend this is our frame. */
m->m_pkthdr.rcvif = bifp;
bifp->if_ipackets++;
bifp->if_ibytes += m->m_pkthdr.len + sizeof(struct ether_header);
/* Check for a BPF tap */
if (bifp->if_bpf != NULL)
BPF_MTAP(bifp, m);
return;
}
/*
* Take a quick peek at the packet and see if it's ok for us to use
* the inet or inet6 hash methods on it, if they're enabled. We do
* this by setting flags in the mbuf header. Once we've made up our
* mind what to do, we pass the frame to ether_output() for further
* processing.
*/
static int
ng_fec_output(struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt0)
{
const priv_p priv = (priv_p) ifp->if_softc;
struct ng_fec_bundle *b;
int error;
/* Check interface flags */
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
m_freem(m);
return (ENETDOWN);
}
b = &priv->fec_bundle;
switch (b->fec_btype) {
case FEC_BTYPE_MAC:
m->m_flags |= M_FEC_MAC;
break;
#ifdef INET
case FEC_BTYPE_INET:
/*
* We can't use the INET address port selection
* scheme if this isn't an INET packet.
*/
if (dst->sa_family == AF_INET)
m->m_flags |= M_FEC_INET;
#ifdef INET6
else if (dst->sa_family == AF_INET6)
m->m_flags |= M_FEC_INET6;
#endif
else {
#ifdef DEBUG
printf("fec%d: can't do inet aggregation of non "
"inet packet\n", ifp->if_unit);
#endif
m->m_flags |= M_FEC_MAC;
}
break;
#endif
default:
printf("fec%d: bogus hash type: %d\n", ifp->if_unit,
b->fec_btype);
m_freem(m);
return(EINVAL);
break;
}
/*
* Pass the frame to ether_output() for all the protocol
* handling. This will put the ethernet header on the packet
* for us.
*/
priv->if_error = 0;
error = ether_output(ifp, m, dst, rt0);
if (priv->if_error && !error)
error = priv->if_error;
return(error);
}
/*
* Apply a hash to the source and destination addresses in the packet
* in order to select an interface. Also check link status and handle
* dead links accordingly.
*/
static int
ng_fec_choose_port(struct ng_fec_bundle *b,
struct mbuf *m, struct ifnet **ifp)
{
struct ether_header *eh;
struct mbuf *m0;
#ifdef INET
struct ip *ip;
#ifdef INET6
struct ip6_hdr *ip6;
#endif
#endif
struct ng_fec_portlist *p;
int port = 0, mask;
/*
* If there are only two ports, mask off all but the
* last bit for XORing. If there are 4, mask off all
* but the last 2 bits.
*/
mask = b->fec_ifcnt == 2 ? 0x1 : 0x3;
eh = mtod(m, struct ether_header *);
#ifdef INET
ip = (struct ip *)(mtod(m, char *) +
sizeof(struct ether_header));
#ifdef INET6
ip6 = (struct ip6_hdr *)(mtod(m, char *) +
sizeof(struct ether_header));
#endif
#endif
/*
* The fg_fec_output() routine is supposed to leave a
* flag for us in the mbuf that tells us what hash to
* use, but sometimes a new mbuf is prepended to the
* chain, so we have to search every mbuf in the chain
* to find the flags.
*/
m0 = m;
while (m0) {
if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6))
break;
m0 = m0->m_next;
}
if (m0 == NULL)
return(EINVAL);
switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) {
case M_FEC_MAC:
port = (eh->ether_dhost[5] ^
eh->ether_shost[5]) & mask;
break;
#ifdef INET
case M_FEC_INET:
port = (ntohl(ip->ip_dst.s_addr) ^
ntohl(ip->ip_src.s_addr)) & mask;
break;
#ifdef INET6
case M_FEC_INET6:
port = (ip6->ip6_dst.s6_addr[15] ^
ip6->ip6_dst.s6_addr[15]) & mask;
break;
#endif
#endif
default:
return(EINVAL);
break;
}
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
if (port == p->fec_idx)
break;
}
/*
* Now that we've chosen a port, make sure it's
* alive. If it's not alive, cycle through the bundle
* looking for a port that is alive. If we don't find
* any, return an error.
*/
if (p->fec_ifstat != 1) {
struct ng_fec_portlist *n = NULL;
n = TAILQ_NEXT(p, fec_list);
if (n == NULL)
n = TAILQ_FIRST(&b->ng_fec_ports);
while (n != p) {
if (n->fec_ifstat == 1)
break;
n = TAILQ_NEXT(n, fec_list);
if (n == NULL)
n = TAILQ_FIRST(&b->ng_fec_ports);
}
if (n == p)
return(EAGAIN);
p = n;
}
*ifp = p->fec_if;
return(0);
}
/*
* Now that the packet has been run through ether_output(), yank it
* off our own send queue and stick it on the queue for the appropriate
* underlying physical interface. Note that if the interface's send
* queue is full, we save an error status in our private netgraph
* space which will eventually be handed up to ng_fec_output(), which
* will return it to the rest of the IP stack. We need to do this
* in order to duplicate the effect of ether_output() returning ENOBUFS
* when it detects that an interface's send queue is full. There's no
* other way to signal the error status from here since the if_start()
* routine is spec'ed to return void.
*
* Once the frame is queued, we call ether_output_frame() to initiate
* transmission.
*/
static void
ng_fec_start(struct ifnet *ifp)
{
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
struct ifnet *oifp = NULL;
struct mbuf *m0;
int error;
priv = ifp->if_softc;
b = &priv->fec_bundle;
IF_DEQUEUE(&ifp->if_snd, m0);
if (m0 == NULL)
return;
BPF_MTAP(ifp, m0);
/* Queue up packet on the proper port. */
error = ng_fec_choose_port(b, m0, &oifp);
if (error) {
ifp->if_ierrors++;
m_freem(m0);
priv->if_error = ENOBUFS;
return;
}
ifp->if_opackets++;
priv->if_error = ether_output_frame(oifp, m0);
return;
}
#ifdef DEBUG
/*
* Display an ioctl to the virtual interface
*/
static void
ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
{
char *str;
switch (command & IOC_DIRMASK) {
case IOC_VOID:
str = "IO";
break;
case IOC_OUT:
str = "IOR";
break;
case IOC_IN:
str = "IOW";
break;
case IOC_INOUT:
str = "IORW";
break;
default:
str = "IO??";
}
log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n",
ifp->if_name, ifp->if_unit,
str,
IOCGROUP(command),
command & 0xff,
IOCPARM_LEN(command));
}
#endif /* DEBUG */
/************************************************************************
NETGRAPH NODE STUFF
************************************************************************/
/*
* Constructor for a node
*/
static int
ng_fec_constructor(node_p node)
{
char ifname[NG_FEC_FEC_NAME_MAX + 1];
struct ifnet *ifp;
priv_p priv;
struct ng_fec_bundle *b;
int error = 0;
/* Allocate node and interface private structures */
MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
if (priv == NULL)
return (ENOMEM);
bzero(priv, sizeof(*priv));
ifp = &priv->arpcom.ac_if;
b = &priv->fec_bundle;
/* Link them together */
ifp->if_softc = priv;
/* Get an interface unit number */
if ((error = ng_fec_get_unit(&priv->unit)) != 0) {
FREE(ifp, M_NETGRAPH);
FREE(priv, M_NETGRAPH);
return (error);
}
/* Link together node and private info */
NG_NODE_SET_PRIVATE(node, priv);
priv->node = node;
priv->arpcom.ac_netgraph = node;
/* Initialize interface structure */
ifp->if_name = NG_FEC_FEC_NAME;
ifp->if_unit = priv->unit;
ifp->if_output = ng_fec_output;
ifp->if_start = ng_fec_start;
ifp->if_ioctl = ng_fec_ioctl;
ifp->if_init = ng_fec_init;
ifp->if_watchdog = NULL;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
ifp->if_mtu = NG_FEC_MTU_DEFAULT;
ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST);
ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
ifp->if_addrlen = 0; /* XXX */
ifp->if_hdrlen = 0; /* XXX */
ifp->if_baudrate = 100000000; /* XXX */
TAILQ_INIT(&ifp->if_addrhead);
/* Give this node the same name as the interface (if possible) */
bzero(ifname, sizeof(ifname));
snprintf(ifname, sizeof(ifname), "%s%d", ifp->if_name, ifp->if_unit);
if (ng_name_node(node, ifname) != 0)
log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
/* Grab hold of the ether_input pipe. */
if (ng_ether_input_p == NULL)
ng_ether_input_p = ng_fec_input;
/* Attach the interface */
ether_ifattach(ifp, priv->arpcom.ac_enaddr);
callout_handle_init(&priv->fec_ch);
TAILQ_INIT(&b->ng_fec_ports);
b->fec_ifcnt = 0;
ifmedia_init(&priv->ifmedia, 0,
ng_fec_ifmedia_upd, ng_fec_ifmedia_sts);
ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL);
ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE);
/* Done */
return (0);
}
/*
* Receive a control message
*/
static int
ng_fec_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
const priv_p priv = NG_NODE_PRIVATE(node);
struct ng_fec_bundle *b;
struct ng_mesg *resp = NULL;
struct ng_mesg *msg;
char *ifname;
int error = 0;
NGI_GET_MSG(item, msg);
b = &priv->fec_bundle;
switch (msg->header.typecookie) {
case NGM_FEC_COOKIE:
switch (msg->header.cmd) {
case NGM_FEC_ADD_IFACE:
ifname = msg->data;
error = ng_fec_addport(priv, ifname);
break;
case NGM_FEC_DEL_IFACE:
ifname = msg->data;
error = ng_fec_delport(priv, ifname);
break;
case NGM_FEC_SET_MODE_MAC:
b->fec_btype = FEC_BTYPE_MAC;
break;
#ifdef INET
case NGM_FEC_SET_MODE_INET:
b->fec_btype = FEC_BTYPE_INET;
break;
#ifdef INET6
case NGM_FEC_SET_MODE_INET6:
b->fec_btype = FEC_BTYPE_INET6;
break;
#endif
#endif
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return (error);
}
/*
* Shutdown and remove the node and its associated interface.
*/
static int
ng_fec_shutdown(node_p node)
{
const priv_p priv = NG_NODE_PRIVATE(node);
struct ng_fec_bundle *b;
struct ng_fec_portlist *p;
char ifname[IFNAMSIZ];
b = &priv->fec_bundle;
ng_fec_stop(&priv->arpcom.ac_if);
while (!TAILQ_EMPTY(&b->ng_fec_ports)) {
p = TAILQ_FIRST(&b->ng_fec_ports);
sprintf(ifname, "%s%d",
p->fec_if->if_name,
p->fec_if->if_unit);
ng_fec_delport(priv, ifname);
}
if (ng_ether_input_p != NULL)
ng_ether_input_p = NULL;
ether_ifdetach(&priv->arpcom.ac_if);
ifmedia_removeall(&priv->ifmedia);
ng_fec_free_unit(priv->unit);
FREE(priv, M_NETGRAPH);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
return (0);
}
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