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freebsd-skq/sys/netgraph/ng_fec.c
David Malone 34fa9e8a37 Help ng_fec deal with multicast addresses. 
While ng_fec called the ioctl to let interfaces in the bundle know
the list of multicast addresses had changed, it never actually
updated that list on the interfaces in the bundle. Consequently,
the multicast filters could be programmed incorrectly.

if_lagg does this correctly, by maintaining a list of addresses
that it has added to interfaces in the bundle. This commit basically
takes the if_lagg code and adds it to ng_fec.

A version of this patch for RELENG_6 has fixed some problems with
IPv6 ND over ng_fec. This is probably the problem in PR 107523.

PR:		107523
Tested by:	Rob Gallagher <robert.gallagher@heanet.ie>
Obtained from:	if_lagg
MFC after:	3 weeks
2007-05-18 15:05:49 +00:00

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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_dl.h>
#include <net/if_types.h>
#include <net/if_media.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>
/*
* We need a way to stash a pointer to our netgraph node in the
* ifnet structure so that receive handling works. As far as I can
* tell, although there is an AF_NETGRAPH address family, it's only
* used to identify sockaddr_ng structures: there is no netgraph address
* family domain. This means the AF_NETGRAPH entry in ifp->if_afdata
* should be unused, so we can use to hold our node context.
*/
#define IFP2NG(ifp) ((ifp)->if_afdata[AF_NETGRAPH])
/*
* 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;
void (*fec_if_input) (struct ifnet *,
struct mbuf *);
int fec_idx;
int fec_ifstat;
struct ether_addr fec_mac;
SLIST_HEAD(__mclhd, ng_fec_mc) fec_mc_head;
TAILQ_ENTRY(ng_fec_portlist) fec_list;
};
struct ng_fec_mc {
struct ifmultiaddr *mc_ifma;
SLIST_ENTRY(ng_fec_mc) mc_entries;
};
struct ng_fec_bundle {
TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports;
int fec_ifcnt;
int fec_btype;
int (*fec_if_output) (struct ifnet *,
struct mbuf *,
struct sockaddr *,
struct rtentry *);
};
#define FEC_BTYPE_MAC 0x01
#define FEC_BTYPE_INET 0x02
#define FEC_BTYPE_INET6 0x03
/* Node private data */
struct ng_fec_private {
struct ifnet *ifp;
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);
static int ng_fec_ether_cmdmulti(struct ifnet *trifp, struct ng_fec_portlist *p, int set);
#ifdef DEBUG
static void ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
#endif
/* Netgraph methods */
static int ng_fec_mod_event(module_t, int, void *);
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 = {
.version = NG_ABI_VERSION,
.name = NG_FEC_NODE_TYPE,
.mod_event = ng_fec_mod_event,
.constructor = ng_fec_constructor,
.rcvmsg = ng_fec_rcvmsg,
.shutdown = ng_fec_shutdown,
.cmdlist = 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)
static struct mtx ng_fec_mtx;
/*
* 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;
mtx_lock(&ng_fec_mtx);
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) {
mtx_unlock(&ng_fec_mtx);
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", __func__, ng_fec_units[index], bit));
ng_fec_units[index] &= ~(1 << bit);
*unit = (index * UNITS_BITSPERWORD) + bit;
ng_units_in_use++;
mtx_unlock(&ng_fec_mtx);
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;
mtx_lock(&ng_fec_mtx);
KASSERT(index < ng_fec_units_len,
("%s: unit=%d len=%d", __func__, unit, ng_fec_units_len));
KASSERT((ng_fec_units[index] & (1 << bit)) == 0,
("%s: unit=%d is free", __func__, 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;
}
mtx_unlock(&ng_fec_mtx);
}
/************************************************************************
INTERFACE STUFF
************************************************************************/
static int
ng_fec_addport(struct ng_fec_private *priv, char *iface)
{
struct ng_fec_bundle *b;
struct ifnet *ifp, *bifp;
struct ng_fec_portlist *p, *new;
if (priv == NULL || iface == NULL)
return(EINVAL);
b = &priv->fec_bundle;
ifp = priv->ifp;
/* Only allow reconfiguration if not running. */
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
printf("fec%d: can't add new iface; bundle is running\n",
priv->unit);
return (EINVAL);
}
/* 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);
}
}
/*
* All interfaces must use the same output vector. Once the
* user attaches an interface of one type, make all subsequent
* interfaces have the same output vector.
*/
if (b->fec_if_output != NULL) {
if (b->fec_if_output != bifp->if_output) {
printf("fec%d: iface %s is not the same type "
"as the other interface(s) already in "
"the 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);
IF_AFDATA_LOCK(bifp);
IFP2NG(bifp) = priv->node;
IF_AFDATA_UNLOCK(bifp);
/*
* 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)
if_setlladdr(ifp, IF_LLADDR(bifp), ETHER_ADDR_LEN);
b->fec_btype = FEC_BTYPE_MAC;
new->fec_idx = b->fec_ifcnt;
b->fec_ifcnt++;
/* Initialise the list of multicast addresses that we own. */
SLIST_INIT(&new->fec_mc_head);
/* Save the real MAC address. */
bcopy(IF_LLADDR(bifp),
(char *)&new->fec_mac, ETHER_ADDR_LEN);
/* Set up phony MAC address. */
if_setlladdr(bifp, IF_LLADDR(ifp), ETHER_ADDR_LEN);
/* Save original input vector */
new->fec_if_input = bifp->if_input;
/* Override it with our own */
bifp->if_input = ng_fec_input;
/* Save output vector too. */
if (b->fec_if_output == NULL)
b->fec_if_output = bifp->if_output;
/* Add to the queue */
new->fec_if = bifp;
new->fec_ifstat = -1;
TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list);
/* Add multicast addresses to this port. */
ng_fec_ether_cmdmulti(ifp, new, 1);
return(0);
}
static int
ng_fec_delport(struct ng_fec_private *priv, char *iface)
{
struct ng_fec_bundle *b;
struct ifnet *ifp, *bifp;
struct ng_fec_portlist *p;
if (priv == NULL || iface == NULL)
return(EINVAL);
b = &priv->fec_bundle;
ifp = priv->ifp;
/* Only allow reconfiguration if not running. */
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
printf("fec%d: can't remove iface; bundle is running\n",
priv->unit);
return (EINVAL);
}
/* 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. */
if_setlladdr(bifp, (u_char *)&p->fec_mac, ETHER_ADDR_LEN);
/* Restore input vector */
bifp->if_input = p->fec_if_input;
/* Remove our node context pointer. */
IF_AFDATA_LOCK(bifp);
IFP2NG(bifp) = NULL;
IF_AFDATA_UNLOCK(bifp);
/* Delete port */
TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list);
FREE(p, M_NETGRAPH);
b->fec_ifcnt--;
if (b->fec_ifcnt == 0)
b->fec_if_output = NULL;
return(0);
}
static int
ng_fec_ether_cmdmulti(struct ifnet *trifp, struct ng_fec_portlist *p, int set)
{
struct ifnet *ifp = p->fec_if;
struct ng_fec_mc *mc;
struct ifmultiaddr *ifma, *rifma = NULL;
struct sockaddr_dl sdl;
int error;
bzero((char *)&sdl, sizeof(sdl));
sdl.sdl_len = sizeof(sdl);
sdl.sdl_family = AF_LINK;
sdl.sdl_type = IFT_ETHER;
sdl.sdl_alen = ETHER_ADDR_LEN;
sdl.sdl_index = ifp->if_index;
if (set) {
TAILQ_FOREACH(ifma, &trifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK)
continue;
bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
LLADDR(&sdl), ETHER_ADDR_LEN);
error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
if (error)
return (error);
mc = malloc(sizeof(struct ng_fec_mc), M_DEVBUF, M_NOWAIT);
if (mc == NULL)
return (ENOMEM);
mc->mc_ifma = rifma;
SLIST_INSERT_HEAD(&p->fec_mc_head, mc, mc_entries);
}
} else {
while ((mc = SLIST_FIRST(&p->fec_mc_head)) != NULL) {
SLIST_REMOVE(&p->fec_mc_head, mc, ng_fec_mc, mc_entries);
if_delmulti_ifma(mc->mc_ifma);
free(mc, M_DEVBUF);
}
}
return (0);
}
static int
ng_fec_ether_setmulti(struct ifnet *ifp)
{
struct ng_fec_private *priv;
struct ng_fec_bundle *b;
struct ng_fec_portlist *p;
priv = ifp->if_softc;
b = &priv->fec_bundle;
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
/* First, remove any existing filter entries. */
ng_fec_ether_cmdmulti(ifp, p, 0);
/* copy all addresses from the fec interface to the port */
ng_fec_ether_cmdmulti(ifp, p, 1);
}
return (0);
}
/*
* Pass an ioctl command down to all the underyling interfaces in a
* bundle. Used for setting 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;
priv = arg;
ifp = priv->ifp;
b = &priv->fec_bundle;
if (b->fec_ifcnt != 2 && b->fec_ifcnt != FEC_BUNDLESIZ) {
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;
}
ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
ifp->if_drv_flags |= IFF_DRV_RUNNING;
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);
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
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\n", priv->unit, ifp->if_xname);
continue;
}
if (ifmr.ifm_status & IFM_AVALID) {
if (ifmr.ifm_status & IFM_ACTIVE) {
if (p->fec_ifstat == -1 ||
p->fec_ifstat == 0) {
p->fec_ifstat = 1;
printf("fec%d: port %s in bundle "
"is up\n", priv->unit,
ifp->if_xname);
}
} else {
if (p->fec_ifstat == -1 ||
p->fec_ifstat == 1) {
p->fec_ifstat = 0;
printf("fec%d: port %s in bundle "
"is down\n", priv->unit,
ifp->if_xname);
}
}
}
}
ifp = priv->ifp;
if (ifp->if_drv_flags & IFF_DRV_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 == 1) {
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:
error = ether_ioctl(ifp, command, data);
break;
case SIOCSIFMTU:
if (ifr->ifr_mtu >= NG_FEC_MTU_MIN &&
ifr->ifr_mtu <= NG_FEC_MTU_MAX) {
struct ng_fec_portlist *p;
struct ifnet *bifp;
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
bifp = p->fec_if;
error = (*bifp->if_ioctl)(bifp, SIOCSIFMTU,
data);
if (error != 0)
break;
}
if (error == 0)
ifp->if_mtu = ifr->ifr_mtu;
} else
error = EINVAL;
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_drv_flags & IFF_DRV_RUNNING)) {
/* Sanity. */
if (b->fec_ifcnt != 2 &&
b->fec_ifcnt != FEC_BUNDLESIZ) {
printf("fec%d: invalid bundle "
"size: %d\n", priv->unit,
b->fec_ifcnt);
error = EINVAL;
break;
}
ng_fec_init(priv);
}
/*
* 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_drv_flags & IFF_DRV_RUNNING)
ng_fec_stop(ifp);
}
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
ng_fec_ether_setmulti(ifp);
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 received by underlying network device
* drivers. When we add an interface to our bundle, we override its
* if_input routine with a pointer to ng_fec_input(). This means we
* get to look at all the device's packets before sending them to the
* real ether_input() for processing by the stack. Once we verify the
* packet comes from an interface that's been aggregated into
* our bundle, we fix up the rcvif 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 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->ifp;
TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
if (p->fec_if == m0->m_pkthdr.rcvif)
break;
}
/* Wasn't meant for us; leave this frame alone. */
if (p == NULL)
return;
/*
* Check for a BPF tap on the underlying interface. This
* is mainly a debugging aid: it allows tcpdump-ing of an
* individual interface in a bundle to work, which it
* otherwise would not. BPF tapping of our own aggregate
* interface will occur once we call ether_input().
*/
BPF_MTAP(m0->m_pkthdr.rcvif, m0);
/* Convince the system that this is our frame. */
m0->m_pkthdr.rcvif = bifp;
/*
* Count bytes on an individual interface in a bundle.
* The bytes will also be added to the aggregate interface
* once we call ether_input().
*/
ifp->if_ibytes += m0->m_pkthdr.len;
bifp->if_ipackets++;
(*bifp->if_input)(bifp, m0);
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 output vector 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) &&
(ifp->if_drv_flags & IFF_DRV_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
if_printf(ifp, "can't do inet aggregation of non "
"inet packet\n");
#endif
m->m_flags |= M_FEC_MAC;
}
break;
#endif
default:
if_printf(ifp, "bogus hash type: %d\n",
b->fec_btype);
m_freem(m);
return(EINVAL);
break;
}
/*
* Pass the frame to the output vector for all the protocol
* handling. This will put the ethernet header on the packet
* for us.
*/
priv->if_error = 0;
error = (*b->fec_if_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 = IF_HANDOFF(&oifp->if_snd, m0, oifp) ? 0 : ENOBUFS;
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: %s('%c', %d, char[%d])\n",
ifp->if_xname,
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;
const uint8_t eaddr[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
struct ng_fec_bundle *b;
int error = 0;
/* Allocate node and interface private structures */
MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
if (priv == NULL)
return (ENOMEM);
ifp = priv->ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
FREE(priv, M_NETGRAPH);
return (ENOSPC);
}
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) {
if_free(ifp);
FREE(priv, M_NETGRAPH);
return (error);
}
/* Link together node and private info */
NG_NODE_SET_PRIVATE(node, priv);
priv->node = node;
/* Initialize interface structure */
if_initname(ifp, NG_FEC_FEC_NAME, priv->unit);
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_addrlen = 0; /* XXX */
ifp->if_hdrlen = 0; /* XXX */
ifp->if_baudrate = 100000000; /* XXX */
TAILQ_INIT(&ifp->if_addrhead); /* XXX useless - done in if_attach */
/* Give this node the same name as the interface (if possible) */
bzero(ifname, sizeof(ifname));
strlcpy(ifname, ifp->if_xname, sizeof(ifname));
if (ng_name_node(node, ifname) != 0)
log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
/* Attach the interface */
ether_ifattach(ifp, eaddr);
callout_handle_init(&priv->fec_ch);
/* Override output method with our own */
ifp->if_output = ng_fec_output;
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;
b = &priv->fec_bundle;
ng_fec_stop(priv->ifp);
while (!TAILQ_EMPTY(&b->ng_fec_ports)) {
p = TAILQ_FIRST(&b->ng_fec_ports);
ng_fec_ether_cmdmulti(priv->ifp, p, 0);
ng_fec_delport(priv, p->fec_if->if_xname);
}
ether_ifdetach(priv->ifp);
if_free_type(priv->ifp, IFT_ETHER);
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);
}
/*
* Handle loading and unloading for this node type.
*/
static int
ng_fec_mod_event(module_t mod, int event, void *data)
{
int error = 0;
switch (event) {
case MOD_LOAD:
mtx_init(&ng_fec_mtx, "ng_fec", NULL, MTX_DEF);
break;
case MOD_UNLOAD:
mtx_destroy(&ng_fec_mtx);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
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