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freebsd/sys/net/if_lagg.c
Adrian Chadd 49de4f2214 Break out the static, global LACP debug options into a per-lagg unit 
sysctl tree.

* Create a net.link.lagg.X.lacp node
* Add a debug node under that for tx_test and rx_test
* Add lacp_strict_mode, defaulting to 1

tx_test and rx_test are still a bitmap of unit numbers for now.
At some point it would be nice to create child nodes of the lagg bundle
for each sub-interface, and then populate those with various knobs
and statistics.

Sponsored by:	Netflix
2013-07-26 19:41:13 +00:00

1986 lines
47 KiB
C
Raw Blame History

/* $OpenBSD: if_trunk.c,v 1.30 2007/01/31 06:20:19 reyk Exp $ */
/*
* Copyright (c) 2005, 2006 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2007 Andrew Thompson <thompsa@FreeBSD.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/module.h>
#include <sys/priv.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/hash.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/taskqueue.h>
#include <sys/eventhandler.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_clone.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_llc.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/bpf.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#endif
#ifdef INET
#include <netinet/in_systm.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#endif
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/in6_ifattach.h>
#endif
#include <net/if_vlan_var.h>
#include <net/if_lagg.h>
#include <net/ieee8023ad_lacp.h>
/* Special flags we should propagate to the lagg ports. */
static struct {
int flag;
int (*func)(struct ifnet *, int);
} lagg_pflags[] = {
{IFF_PROMISC, ifpromisc},
{IFF_ALLMULTI, if_allmulti},
{0, NULL}
};
SLIST_HEAD(__trhead, lagg_softc) lagg_list; /* list of laggs */
static struct mtx lagg_list_mtx;
eventhandler_tag lagg_detach_cookie = NULL;
static int lagg_clone_create(struct if_clone *, int, caddr_t);
static void lagg_clone_destroy(struct ifnet *);
static struct if_clone *lagg_cloner;
static const char laggname[] = "lagg";
static void lagg_lladdr(struct lagg_softc *, uint8_t *);
static void lagg_capabilities(struct lagg_softc *);
static void lagg_port_lladdr(struct lagg_port *, uint8_t *);
static void lagg_port_setlladdr(void *, int);
static int lagg_port_create(struct lagg_softc *, struct ifnet *);
static int lagg_port_destroy(struct lagg_port *, int);
static struct mbuf *lagg_input(struct ifnet *, struct mbuf *);
static void lagg_linkstate(struct lagg_softc *);
static void lagg_port_state(struct ifnet *, int);
static int lagg_port_ioctl(struct ifnet *, u_long, caddr_t);
static int lagg_port_output(struct ifnet *, struct mbuf *,
const struct sockaddr *, struct route *);
static void lagg_port_ifdetach(void *arg __unused, struct ifnet *);
#ifdef LAGG_PORT_STACKING
static int lagg_port_checkstacking(struct lagg_softc *);
#endif
static void lagg_port2req(struct lagg_port *, struct lagg_reqport *);
static void lagg_init(void *);
static void lagg_stop(struct lagg_softc *);
static int lagg_ioctl(struct ifnet *, u_long, caddr_t);
static int lagg_ether_setmulti(struct lagg_softc *);
static int lagg_ether_cmdmulti(struct lagg_port *, int);
static int lagg_setflag(struct lagg_port *, int, int,
int (*func)(struct ifnet *, int));
static int lagg_setflags(struct lagg_port *, int status);
static int lagg_transmit(struct ifnet *, struct mbuf *);
static void lagg_qflush(struct ifnet *);
static int lagg_media_change(struct ifnet *);
static void lagg_media_status(struct ifnet *, struct ifmediareq *);
static struct lagg_port *lagg_link_active(struct lagg_softc *,
struct lagg_port *);
static const void *lagg_gethdr(struct mbuf *, u_int, u_int, void *);
static int lagg_sysctl_active(SYSCTL_HANDLER_ARGS);
/* Simple round robin */
static int lagg_rr_attach(struct lagg_softc *);
static int lagg_rr_detach(struct lagg_softc *);
static int lagg_rr_start(struct lagg_softc *, struct mbuf *);
static struct mbuf *lagg_rr_input(struct lagg_softc *, struct lagg_port *,
struct mbuf *);
/* Active failover */
static int lagg_fail_attach(struct lagg_softc *);
static int lagg_fail_detach(struct lagg_softc *);
static int lagg_fail_start(struct lagg_softc *, struct mbuf *);
static struct mbuf *lagg_fail_input(struct lagg_softc *, struct lagg_port *,
struct mbuf *);
/* Loadbalancing */
static int lagg_lb_attach(struct lagg_softc *);
static int lagg_lb_detach(struct lagg_softc *);
static int lagg_lb_port_create(struct lagg_port *);
static void lagg_lb_port_destroy(struct lagg_port *);
static int lagg_lb_start(struct lagg_softc *, struct mbuf *);
static struct mbuf *lagg_lb_input(struct lagg_softc *, struct lagg_port *,
struct mbuf *);
static int lagg_lb_porttable(struct lagg_softc *, struct lagg_port *);
/* 802.3ad LACP */
static int lagg_lacp_attach(struct lagg_softc *);
static int lagg_lacp_detach(struct lagg_softc *);
static int lagg_lacp_start(struct lagg_softc *, struct mbuf *);
static struct mbuf *lagg_lacp_input(struct lagg_softc *, struct lagg_port *,
struct mbuf *);
static void lagg_lacp_lladdr(struct lagg_softc *);
static void lagg_callout(void *);
/* lagg protocol table */
static const struct {
int ti_proto;
int (*ti_attach)(struct lagg_softc *);
} lagg_protos[] = {
{ LAGG_PROTO_ROUNDROBIN, lagg_rr_attach },
{ LAGG_PROTO_FAILOVER, lagg_fail_attach },
{ LAGG_PROTO_LOADBALANCE, lagg_lb_attach },
{ LAGG_PROTO_ETHERCHANNEL, lagg_lb_attach },
{ LAGG_PROTO_LACP, lagg_lacp_attach },
{ LAGG_PROTO_NONE, NULL }
};
SYSCTL_DECL(_net_link);
SYSCTL_NODE(_net_link, OID_AUTO, lagg, CTLFLAG_RW, 0,
"Link Aggregation");
static int lagg_failover_rx_all = 0; /* Allow input on any failover links */
SYSCTL_INT(_net_link_lagg, OID_AUTO, failover_rx_all, CTLFLAG_RW,
&lagg_failover_rx_all, 0,
"Accept input from any interface in a failover lagg");
static int def_use_flowid = 1; /* Default value for using M_FLOWID */
TUNABLE_INT("net.link.lagg.default_use_flowid", &def_use_flowid);
SYSCTL_INT(_net_link_lagg, OID_AUTO, default_use_flowid, CTLFLAG_RW,
&def_use_flowid, 0,
"Default setting for using flow id for load sharing");
static int
lagg_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
mtx_init(&lagg_list_mtx, "if_lagg list", NULL, MTX_DEF);
SLIST_INIT(&lagg_list);
lagg_cloner = if_clone_simple(laggname, lagg_clone_create,
lagg_clone_destroy, 0);
lagg_input_p = lagg_input;
lagg_linkstate_p = lagg_port_state;
lagg_detach_cookie = EVENTHANDLER_REGISTER(
ifnet_departure_event, lagg_port_ifdetach, NULL,
EVENTHANDLER_PRI_ANY);
break;
case MOD_UNLOAD:
EVENTHANDLER_DEREGISTER(ifnet_departure_event,
lagg_detach_cookie);
if_clone_detach(lagg_cloner);
lagg_input_p = NULL;
lagg_linkstate_p = NULL;
mtx_destroy(&lagg_list_mtx);
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t lagg_mod = {
"if_lagg",
lagg_modevent,
0
};
DECLARE_MODULE(if_lagg, lagg_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(if_lagg, 1);
/*
* This routine is run via an vlan
* config EVENT
*/
static void
lagg_register_vlan(void *arg, struct ifnet *ifp, u_int16_t vtag)
{
struct lagg_softc *sc = ifp->if_softc;
struct lagg_port *lp;
if (ifp->if_softc != arg) /* Not our event */
return;
LAGG_RLOCK(sc);
if (!SLIST_EMPTY(&sc->sc_ports)) {
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
EVENTHANDLER_INVOKE(vlan_config, lp->lp_ifp, vtag);
}
LAGG_RUNLOCK(sc);
}
/*
* This routine is run via an vlan
* unconfig EVENT
*/
static void
lagg_unregister_vlan(void *arg, struct ifnet *ifp, u_int16_t vtag)
{
struct lagg_softc *sc = ifp->if_softc;
struct lagg_port *lp;
if (ifp->if_softc != arg) /* Not our event */
return;
LAGG_RLOCK(sc);
if (!SLIST_EMPTY(&sc->sc_ports)) {
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
EVENTHANDLER_INVOKE(vlan_unconfig, lp->lp_ifp, vtag);
}
LAGG_RUNLOCK(sc);
}
static int
lagg_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
struct lagg_softc *sc;
struct ifnet *ifp;
int i, error = 0;
static const u_char eaddr[6]; /* 00:00:00:00:00:00 */
struct sysctl_oid *oid;
char num[14]; /* sufficient for 32 bits */
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
free(sc, M_DEVBUF);
return (ENOSPC);
}
sc->sc_ipackets = counter_u64_alloc(M_WAITOK);
sc->sc_opackets = counter_u64_alloc(M_WAITOK);
sc->sc_ibytes = counter_u64_alloc(M_WAITOK);
sc->sc_obytes = counter_u64_alloc(M_WAITOK);
sysctl_ctx_init(&sc->ctx);
snprintf(num, sizeof(num), "%u", unit);
sc->use_flowid = def_use_flowid;
sc->sc_oid = oid = SYSCTL_ADD_NODE(&sc->ctx,
&SYSCTL_NODE_CHILDREN(_net_link, lagg),
OID_AUTO, num, CTLFLAG_RD, NULL, "");
SYSCTL_ADD_INT(&sc->ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"use_flowid", CTLTYPE_INT|CTLFLAG_RW, &sc->use_flowid, sc->use_flowid,
"Use flow id for load sharing");
SYSCTL_ADD_INT(&sc->ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"count", CTLTYPE_INT|CTLFLAG_RD, &sc->sc_count, sc->sc_count,
"Total number of ports");
SYSCTL_ADD_PROC(&sc->ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"active", CTLTYPE_INT|CTLFLAG_RD, sc, 0, lagg_sysctl_active,
"I", "Total number of active ports");
SYSCTL_ADD_INT(&sc->ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
"flapping", CTLTYPE_INT|CTLFLAG_RD, &sc->sc_flapping,
sc->sc_flapping, "Total number of port change events");
/* Hash all layers by default */
sc->sc_flags = LAGG_F_HASHL2|LAGG_F_HASHL3|LAGG_F_HASHL4;
sc->sc_proto = LAGG_PROTO_NONE;
for (i = 0; lagg_protos[i].ti_proto != LAGG_PROTO_NONE; i++) {
if (lagg_protos[i].ti_proto == LAGG_PROTO_DEFAULT) {
sc->sc_proto = lagg_protos[i].ti_proto;
if ((error = lagg_protos[i].ti_attach(sc)) != 0) {
if_free(ifp);
free(sc, M_DEVBUF);
return (error);
}
break;
}
}
LAGG_LOCK_INIT(sc);
SLIST_INIT(&sc->sc_ports);
TASK_INIT(&sc->sc_lladdr_task, 0, lagg_port_setlladdr, sc);
callout_init_rw(&sc->sc_callout, &sc->sc_mtx, CALLOUT_SHAREDLOCK);
/* Initialise pseudo media types */
ifmedia_init(&sc->sc_media, 0, lagg_media_change,
lagg_media_status);
ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_AUTO, 0, NULL);
ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_AUTO);
if_initname(ifp, laggname, unit);
ifp->if_softc = sc;
ifp->if_transmit = lagg_transmit;
ifp->if_qflush = lagg_qflush;
ifp->if_init = lagg_init;
ifp->if_ioctl = lagg_ioctl;
ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
/*
* Attach as an ordinary ethernet device, children will be attached
* as special device IFT_IEEE8023ADLAG.
*/
ether_ifattach(ifp, eaddr);
sc->vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
lagg_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
sc->vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
lagg_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
/* Insert into the global list of laggs */
mtx_lock(&lagg_list_mtx);
SLIST_INSERT_HEAD(&lagg_list, sc, sc_entries);
mtx_unlock(&lagg_list_mtx);
callout_reset(&sc->sc_callout, hz, lagg_callout, sc);
return (0);
}
static void
lagg_clone_destroy(struct ifnet *ifp)
{
struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
struct lagg_port *lp;
LAGG_WLOCK(sc);
lagg_stop(sc);
ifp->if_flags &= ~IFF_UP;
EVENTHANDLER_DEREGISTER(vlan_config, sc->vlan_attach);
EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vlan_detach);
/* Shutdown and remove lagg ports */
while ((lp = SLIST_FIRST(&sc->sc_ports)) != NULL)
lagg_port_destroy(lp, 1);
/* Unhook the aggregation protocol */
if (sc->sc_detach != NULL)
(*sc->sc_detach)(sc);
LAGG_WUNLOCK(sc);
sysctl_ctx_free(&sc->ctx);
ifmedia_removeall(&sc->sc_media);
ether_ifdetach(ifp);
if_free(ifp);
callout_drain(&sc->sc_callout);
counter_u64_free(sc->sc_ipackets);
counter_u64_free(sc->sc_opackets);
counter_u64_free(sc->sc_ibytes);
counter_u64_free(sc->sc_obytes);
mtx_lock(&lagg_list_mtx);
SLIST_REMOVE(&lagg_list, sc, lagg_softc, sc_entries);
mtx_unlock(&lagg_list_mtx);
taskqueue_drain(taskqueue_swi, &sc->sc_lladdr_task);
LAGG_LOCK_DESTROY(sc);
free(sc, M_DEVBUF);
}
static void
lagg_lladdr(struct lagg_softc *sc, uint8_t *lladdr)
{
struct ifnet *ifp = sc->sc_ifp;
if (memcmp(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN) == 0)
return;
bcopy(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN);
/* Let the protocol know the MAC has changed */
if (sc->sc_lladdr != NULL)
(*sc->sc_lladdr)(sc);
EVENTHANDLER_INVOKE(iflladdr_event, ifp);
}
static void
lagg_capabilities(struct lagg_softc *sc)
{
struct lagg_port *lp;
int cap = ~0, ena = ~0;
u_long hwa = ~0UL;
LAGG_WLOCK_ASSERT(sc);
/* Get capabilities from the lagg ports */
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
cap &= lp->lp_ifp->if_capabilities;
ena &= lp->lp_ifp->if_capenable;
hwa &= lp->lp_ifp->if_hwassist;
}
cap = (cap == ~0 ? 0 : cap);
ena = (ena == ~0 ? 0 : ena);
hwa = (hwa == ~0 ? 0 : hwa);
if (sc->sc_ifp->if_capabilities != cap ||
sc->sc_ifp->if_capenable != ena ||
sc->sc_ifp->if_hwassist != hwa) {
sc->sc_ifp->if_capabilities = cap;
sc->sc_ifp->if_capenable = ena;
sc->sc_ifp->if_hwassist = hwa;
getmicrotime(&sc->sc_ifp->if_lastchange);
if (sc->sc_ifflags & IFF_DEBUG)
if_printf(sc->sc_ifp,
"capabilities 0x%08x enabled 0x%08x\n", cap, ena);
}
}
static void
lagg_port_lladdr(struct lagg_port *lp, uint8_t *lladdr)
{
struct lagg_softc *sc = lp->lp_softc;
struct ifnet *ifp = lp->lp_ifp;
struct lagg_llq *llq;
int pending = 0;
LAGG_WLOCK_ASSERT(sc);
if (lp->lp_detaching ||
memcmp(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN) == 0)
return;
/* Check to make sure its not already queued to be changed */
SLIST_FOREACH(llq, &sc->sc_llq_head, llq_entries) {
if (llq->llq_ifp == ifp) {
pending = 1;
break;
}
}
if (!pending) {
llq = malloc(sizeof(struct lagg_llq), M_DEVBUF, M_NOWAIT);
if (llq == NULL) /* XXX what to do */
return;
}
/* Update the lladdr even if pending, it may have changed */
llq->llq_ifp = ifp;
bcopy(lladdr, llq->llq_lladdr, ETHER_ADDR_LEN);
if (!pending)
SLIST_INSERT_HEAD(&sc->sc_llq_head, llq, llq_entries);
taskqueue_enqueue(taskqueue_swi, &sc->sc_lladdr_task);
}
/*
* Set the interface MAC address from a taskqueue to avoid a LOR.
*/
static void
lagg_port_setlladdr(void *arg, int pending)
{
struct lagg_softc *sc = (struct lagg_softc *)arg;
struct lagg_llq *llq, *head;
struct ifnet *ifp;
int error;
/* Grab a local reference of the queue and remove it from the softc */
LAGG_WLOCK(sc);
head = SLIST_FIRST(&sc->sc_llq_head);
SLIST_FIRST(&sc->sc_llq_head) = NULL;
LAGG_WUNLOCK(sc);
/*
* Traverse the queue and set the lladdr on each ifp. It is safe to do
* unlocked as we have the only reference to it.
*/
for (llq = head; llq != NULL; llq = head) {
ifp = llq->llq_ifp;
/* Set the link layer address */
CURVNET_SET(ifp->if_vnet);
error = if_setlladdr(ifp, llq->llq_lladdr, ETHER_ADDR_LEN);
CURVNET_RESTORE();
if (error)
printf("%s: setlladdr failed on %s\n", __func__,
ifp->if_xname);
head = SLIST_NEXT(llq, llq_entries);
free(llq, M_DEVBUF);
}
}
static int
lagg_port_create(struct lagg_softc *sc, struct ifnet *ifp)
{
struct lagg_softc *sc_ptr;
struct lagg_port *lp;
int error = 0;
LAGG_WLOCK_ASSERT(sc);
/* Limit the maximal number of lagg ports */
if (sc->sc_count >= LAGG_MAX_PORTS)
return (ENOSPC);
/* Check if port has already been associated to a lagg */
if (ifp->if_lagg != NULL) {
/* Port is already in the current lagg? */
lp = (struct lagg_port *)ifp->if_lagg;
if (lp->lp_softc == sc)
return (EEXIST);
return (EBUSY);
}
/* XXX Disallow non-ethernet interfaces (this should be any of 802) */
if (ifp->if_type != IFT_ETHER)
return (EPROTONOSUPPORT);
#ifdef INET6
/*
* The member interface should not have inet6 address because
* two interfaces with a valid link-local scope zone must not be
* merged in any form. This restriction is needed to
* prevent violation of link-local scope zone. Attempts to
* add a member interface which has inet6 addresses triggers
* removal of all inet6 addresses on the member interface.
*/
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
if (in6ifa_llaonifp(lp->lp_ifp)) {
in6_ifdetach(lp->lp_ifp);
if_printf(sc->sc_ifp,
"IPv6 addresses on %s have been removed "
"before adding it as a member to prevent "
"IPv6 address scope violation.\n",
lp->lp_ifp->if_xname);
}
}
if (in6ifa_llaonifp(ifp)) {
in6_ifdetach(ifp);
if_printf(sc->sc_ifp,
"IPv6 addresses on %s have been removed "
"before adding it as a member to prevent "
"IPv6 address scope violation.\n",
ifp->if_xname);
}
#endif
/* Allow the first Ethernet member to define the MTU */
if (SLIST_EMPTY(&sc->sc_ports))
sc->sc_ifp->if_mtu = ifp->if_mtu;
else if (sc->sc_ifp->if_mtu != ifp->if_mtu) {
if_printf(sc->sc_ifp, "invalid MTU for %s\n",
ifp->if_xname);
return (EINVAL);
}
if ((lp = malloc(sizeof(struct lagg_port),
M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
return (ENOMEM);
/* Check if port is a stacked lagg */
mtx_lock(&lagg_list_mtx);
SLIST_FOREACH(sc_ptr, &lagg_list, sc_entries) {
if (ifp == sc_ptr->sc_ifp) {
mtx_unlock(&lagg_list_mtx);
free(lp, M_DEVBUF);
return (EINVAL);
/* XXX disable stacking for the moment, its untested */
#ifdef LAGG_PORT_STACKING
lp->lp_flags |= LAGG_PORT_STACK;
if (lagg_port_checkstacking(sc_ptr) >=
LAGG_MAX_STACKING) {
mtx_unlock(&lagg_list_mtx);
free(lp, M_DEVBUF);
return (E2BIG);
}
#endif
}
}
mtx_unlock(&lagg_list_mtx);
/* Change the interface type */
lp->lp_iftype = ifp->if_type;
ifp->if_type = IFT_IEEE8023ADLAG;
ifp->if_lagg = lp;
lp->lp_ioctl = ifp->if_ioctl;
ifp->if_ioctl = lagg_port_ioctl;
lp->lp_output = ifp->if_output;
ifp->if_output = lagg_port_output;
lp->lp_ifp = ifp;
lp->lp_softc = sc;
/* Save port link layer address */
bcopy(IF_LLADDR(ifp), lp->lp_lladdr, ETHER_ADDR_LEN);
if (SLIST_EMPTY(&sc->sc_ports)) {
sc->sc_primary = lp;
lagg_lladdr(sc, IF_LLADDR(ifp));
} else {
/* Update link layer address for this port */
lagg_port_lladdr(lp, IF_LLADDR(sc->sc_ifp));
}
/* Insert into the list of ports */
SLIST_INSERT_HEAD(&sc->sc_ports, lp, lp_entries);
sc->sc_count++;
/* Update lagg capabilities */
lagg_capabilities(sc);
lagg_linkstate(sc);
/* Add multicast addresses and interface flags to this port */
lagg_ether_cmdmulti(lp, 1);
lagg_setflags(lp, 1);
if (sc->sc_port_create != NULL)
error = (*sc->sc_port_create)(lp);
if (error) {
/* remove the port again, without calling sc_port_destroy */
lagg_port_destroy(lp, 0);
return (error);
}
return (error);
}
#ifdef LAGG_PORT_STACKING
static int
lagg_port_checkstacking(struct lagg_softc *sc)
{
struct lagg_softc *sc_ptr;
struct lagg_port *lp;
int m = 0;
LAGG_WLOCK_ASSERT(sc);
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
if (lp->lp_flags & LAGG_PORT_STACK) {
sc_ptr = (struct lagg_softc *)lp->lp_ifp->if_softc;
m = MAX(m, lagg_port_checkstacking(sc_ptr));
}
}
return (m + 1);
}
#endif
static int
lagg_port_destroy(struct lagg_port *lp, int runpd)
{
struct lagg_softc *sc = lp->lp_softc;
struct lagg_port *lp_ptr;
struct lagg_llq *llq;
struct ifnet *ifp = lp->lp_ifp;
LAGG_WLOCK_ASSERT(sc);
if (runpd && sc->sc_port_destroy != NULL)
(*sc->sc_port_destroy)(lp);
/*
* Remove multicast addresses and interface flags from this port and
* reset the MAC address, skip if the interface is being detached.
*/
if (!lp->lp_detaching) {
lagg_ether_cmdmulti(lp, 0);
lagg_setflags(lp, 0);
lagg_port_lladdr(lp, lp->lp_lladdr);
}
/* Restore interface */
ifp->if_type = lp->lp_iftype;
ifp->if_ioctl = lp->lp_ioctl;
ifp->if_output = lp->lp_output;
ifp->if_lagg = NULL;
/* Finally, remove the port from the lagg */
SLIST_REMOVE(&sc->sc_ports, lp, lagg_port, lp_entries);
sc->sc_count--;
/* Update the primary interface */
if (lp == sc->sc_primary) {
uint8_t lladdr[ETHER_ADDR_LEN];
if ((lp_ptr = SLIST_FIRST(&sc->sc_ports)) == NULL) {
bzero(&lladdr, ETHER_ADDR_LEN);
} else {
bcopy(lp_ptr->lp_lladdr,
lladdr, ETHER_ADDR_LEN);
}
lagg_lladdr(sc, lladdr);
sc->sc_primary = lp_ptr;
/* Update link layer address for each port */
SLIST_FOREACH(lp_ptr, &sc->sc_ports, lp_entries)
lagg_port_lladdr(lp_ptr, lladdr);
}
/* Remove any pending lladdr changes from the queue */
if (lp->lp_detaching) {
SLIST_FOREACH(llq, &sc->sc_llq_head, llq_entries) {
if (llq->llq_ifp == ifp) {
SLIST_REMOVE(&sc->sc_llq_head, llq, lagg_llq,
llq_entries);
free(llq, M_DEVBUF);
break; /* Only appears once */
}
}
}
if (lp->lp_ifflags)
if_printf(ifp, "%s: lp_ifflags unclean\n", __func__);
free(lp, M_DEVBUF);
/* Update lagg capabilities */
lagg_capabilities(sc);
lagg_linkstate(sc);
return (0);
}
static int
lagg_port_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct lagg_reqport *rp = (struct lagg_reqport *)data;
struct lagg_softc *sc;
struct lagg_port *lp = NULL;
int error = 0;
/* Should be checked by the caller */
if (ifp->if_type != IFT_IEEE8023ADLAG ||
(lp = ifp->if_lagg) == NULL || (sc = lp->lp_softc) == NULL)
goto fallback;
switch (cmd) {
case SIOCGLAGGPORT:
if (rp->rp_portname[0] == '\0' ||
ifunit(rp->rp_portname) != ifp) {
error = EINVAL;
break;
}
LAGG_RLOCK(sc);
if ((lp = ifp->if_lagg) == NULL || lp->lp_softc != sc) {
error = ENOENT;
LAGG_RUNLOCK(sc);
break;
}
lagg_port2req(lp, rp);
LAGG_RUNLOCK(sc);
break;
case SIOCSIFCAP:
if (lp->lp_ioctl == NULL) {
error = EINVAL;
break;
}
error = (*lp->lp_ioctl)(ifp, cmd, data);
if (error)
break;
/* Update lagg interface capabilities */
LAGG_WLOCK(sc);
lagg_capabilities(sc);
LAGG_WUNLOCK(sc);
break;
case SIOCSIFMTU:
/* Do not allow the MTU to be changed once joined */
error = EINVAL;
break;
default:
goto fallback;
}
return (error);
fallback:
if (lp->lp_ioctl != NULL)
return ((*lp->lp_ioctl)(ifp, cmd, data));
return (EINVAL);
}
/*
* For direct output to child ports.
*/
static int
lagg_port_output(struct ifnet *ifp, struct mbuf *m,
const struct sockaddr *dst, struct route *ro)
{
struct lagg_port *lp = ifp->if_lagg;
switch (dst->sa_family) {
case pseudo_AF_HDRCMPLT:
case AF_UNSPEC:
return ((*lp->lp_output)(ifp, m, dst, ro));
}
/* drop any other frames */
m_freem(m);
return (ENETDOWN);
}
static void
lagg_port_ifdetach(void *arg __unused, struct ifnet *ifp)
{
struct lagg_port *lp;
struct lagg_softc *sc;
if ((lp = ifp->if_lagg) == NULL)
return;
/* If the ifnet is just being renamed, don't do anything. */
if (ifp->if_flags & IFF_RENAMING)
return;
sc = lp->lp_softc;
LAGG_WLOCK(sc);
lp->lp_detaching = 1;
lagg_port_destroy(lp, 1);
LAGG_WUNLOCK(sc);
}
static void
lagg_port2req(struct lagg_port *lp, struct lagg_reqport *rp)
{
struct lagg_softc *sc = lp->lp_softc;
strlcpy(rp->rp_ifname, sc->sc_ifname, sizeof(rp->rp_ifname));
strlcpy(rp->rp_portname, lp->lp_ifp->if_xname, sizeof(rp->rp_portname));
rp->rp_prio = lp->lp_prio;
rp->rp_flags = lp->lp_flags;
if (sc->sc_portreq != NULL)
(*sc->sc_portreq)(lp, (caddr_t)&rp->rp_psc);
/* Add protocol specific flags */
switch (sc->sc_proto) {
case LAGG_PROTO_FAILOVER:
if (lp == sc->sc_primary)
rp->rp_flags |= LAGG_PORT_MASTER;
if (lp == lagg_link_active(sc, sc->sc_primary))
rp->rp_flags |= LAGG_PORT_ACTIVE;
break;
case LAGG_PROTO_ROUNDROBIN:
case LAGG_PROTO_LOADBALANCE:
case LAGG_PROTO_ETHERCHANNEL:
if (LAGG_PORTACTIVE(lp))
rp->rp_flags |= LAGG_PORT_ACTIVE;
break;
case LAGG_PROTO_LACP:
/* LACP has a different definition of active */
if (lacp_isactive(lp))
rp->rp_flags |= LAGG_PORT_ACTIVE;
if (lacp_iscollecting(lp))
rp->rp_flags |= LAGG_PORT_COLLECTING;
if (lacp_isdistributing(lp))
rp->rp_flags |= LAGG_PORT_DISTRIBUTING;
break;
}
}
static void
lagg_init(void *xsc)
{
struct lagg_softc *sc = (struct lagg_softc *)xsc;
struct lagg_port *lp;
struct ifnet *ifp = sc->sc_ifp;
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
return;
LAGG_WLOCK(sc);
ifp->if_drv_flags |= IFF_DRV_RUNNING;
/* Update the port lladdrs */
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
lagg_port_lladdr(lp, IF_LLADDR(ifp));
if (sc->sc_init != NULL)
(*sc->sc_init)(sc);
LAGG_WUNLOCK(sc);
}
static void
lagg_stop(struct lagg_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
LAGG_WLOCK_ASSERT(sc);
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return;
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
if (sc->sc_stop != NULL)
(*sc->sc_stop)(sc);
}
static int
lagg_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
struct lagg_reqall *ra = (struct lagg_reqall *)data;
struct lagg_reqport *rp = (struct lagg_reqport *)data, rpbuf;
struct lagg_reqflags *rf = (struct lagg_reqflags *)data;
struct ifreq *ifr = (struct ifreq *)data;
struct lagg_port *lp;
struct ifnet *tpif;
struct thread *td = curthread;
char *buf, *outbuf;
int count, buflen, len, error = 0;
bzero(&rpbuf, sizeof(rpbuf));
switch (cmd) {
case SIOCGLAGG:
LAGG_RLOCK(sc);
count = 0;
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
count++;
buflen = count * sizeof(struct lagg_reqport);
LAGG_RUNLOCK(sc);
outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
LAGG_RLOCK(sc);
ra->ra_proto = sc->sc_proto;
if (sc->sc_req != NULL)
(*sc->sc_req)(sc, (caddr_t)&ra->ra_psc);
count = 0;
buf = outbuf;
len = min(ra->ra_size, buflen);
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
if (len < sizeof(rpbuf))
break;
lagg_port2req(lp, &rpbuf);
memcpy(buf, &rpbuf, sizeof(rpbuf));
count++;
buf += sizeof(rpbuf);
len -= sizeof(rpbuf);
}
LAGG_RUNLOCK(sc);
ra->ra_ports = count;
ra->ra_size = count * sizeof(rpbuf);
error = copyout(outbuf, ra->ra_port, ra->ra_size);
free(outbuf, M_TEMP);
break;
case SIOCSLAGG:
error = priv_check(td, PRIV_NET_LAGG);
if (error)
break;
if (ra->ra_proto >= LAGG_PROTO_MAX) {
error = EPROTONOSUPPORT;
break;
}
LAGG_WLOCK(sc);
if (sc->sc_proto != LAGG_PROTO_NONE) {
/* Reset protocol first in case detach unlocks */
sc->sc_proto = LAGG_PROTO_NONE;
error = sc->sc_detach(sc);
sc->sc_detach = NULL;
sc->sc_start = NULL;
sc->sc_input = NULL;
sc->sc_port_create = NULL;
sc->sc_port_destroy = NULL;
sc->sc_linkstate = NULL;
sc->sc_init = NULL;
sc->sc_stop = NULL;
sc->sc_lladdr = NULL;
sc->sc_req = NULL;
sc->sc_portreq = NULL;
} else if (sc->sc_input != NULL) {
/* Still detaching */
error = EBUSY;
}
if (error != 0) {
LAGG_WUNLOCK(sc);
break;
}
for (int i = 0; i < (sizeof(lagg_protos) /
sizeof(lagg_protos[0])); i++) {
if (lagg_protos[i].ti_proto == ra->ra_proto) {
if (sc->sc_ifflags & IFF_DEBUG)
printf("%s: using proto %u\n",
sc->sc_ifname,
lagg_protos[i].ti_proto);
sc->sc_proto = lagg_protos[i].ti_proto;
if (sc->sc_proto != LAGG_PROTO_NONE)
error = lagg_protos[i].ti_attach(sc);
LAGG_WUNLOCK(sc);
return (error);
}
}
LAGG_WUNLOCK(sc);
error = EPROTONOSUPPORT;
break;
case SIOCGLAGGFLAGS:
rf->rf_flags = sc->sc_flags;
break;
case SIOCSLAGGHASH:
error = priv_check(td, PRIV_NET_LAGG);
if (error)
break;
if ((rf->rf_flags & LAGG_F_HASHMASK) == 0) {
error = EINVAL;
break;
}
LAGG_WLOCK(sc);
sc->sc_flags &= ~LAGG_F_HASHMASK;
sc->sc_flags |= rf->rf_flags & LAGG_F_HASHMASK;
LAGG_WUNLOCK(sc);
break;
case SIOCGLAGGPORT:
if (rp->rp_portname[0] == '\0' ||
(tpif = ifunit(rp->rp_portname)) == NULL) {
error = EINVAL;
break;
}
LAGG_RLOCK(sc);
if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
lp->lp_softc != sc) {
error = ENOENT;
LAGG_RUNLOCK(sc);
break;
}
lagg_port2req(lp, rp);
LAGG_RUNLOCK(sc);
break;
case SIOCSLAGGPORT:
error = priv_check(td, PRIV_NET_LAGG);
if (error)
break;
if (rp->rp_portname[0] == '\0' ||
(tpif = ifunit(rp->rp_portname)) == NULL) {
error = EINVAL;
break;
}
LAGG_WLOCK(sc);
error = lagg_port_create(sc, tpif);
LAGG_WUNLOCK(sc);
break;
case SIOCSLAGGDELPORT:
error = priv_check(td, PRIV_NET_LAGG);
if (error)
break;
if (rp->rp_portname[0] == '\0' ||
(tpif = ifunit(rp->rp_portname)) == NULL) {
error = EINVAL;
break;
}
LAGG_WLOCK(sc);
if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
lp->lp_softc != sc) {
error = ENOENT;
LAGG_WUNLOCK(sc);
break;
}
error = lagg_port_destroy(lp, 1);
LAGG_WUNLOCK(sc);
break;
case SIOCSIFFLAGS:
/* Set flags on ports too */
LAGG_WLOCK(sc);
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
lagg_setflags(lp, 1);
}
LAGG_WUNLOCK(sc);
if (!(ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
/*
* If interface is marked down and it is running,
* then stop and disable it.
*/
LAGG_WLOCK(sc);
lagg_stop(sc);
LAGG_WUNLOCK(sc);
} else if ((ifp->if_flags & IFF_UP) &&
!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
/*
* If interface is marked up and it is stopped, then
* start it.
*/
(*ifp->if_init)(sc);
}
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
LAGG_WLOCK(sc);
error = lagg_ether_setmulti(sc);
LAGG_WUNLOCK(sc);
break;
case SIOCSIFMEDIA:
case SIOCGIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
break;
case SIOCSIFCAP:
case SIOCSIFMTU:
/* Do not allow the MTU or caps to be directly changed */
error = EINVAL;
break;
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
return (error);
}
static int
lagg_ether_setmulti(struct lagg_softc *sc)
{
struct lagg_port *lp;
LAGG_WLOCK_ASSERT(sc);
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
/* First, remove any existing filter entries. */
lagg_ether_cmdmulti(lp, 0);
/* copy all addresses from the lagg interface to the port */
lagg_ether_cmdmulti(lp, 1);
}
return (0);
}
static int
lagg_ether_cmdmulti(struct lagg_port *lp, int set)
{
struct lagg_softc *sc = lp->lp_softc;
struct ifnet *ifp = lp->lp_ifp;
struct ifnet *scifp = sc->sc_ifp;
struct lagg_mc *mc;
struct ifmultiaddr *ifma, *rifma = NULL;
struct sockaddr_dl sdl;
int error;
LAGG_WLOCK_ASSERT(sc);
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, &scifp->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 lagg_mc), M_DEVBUF, M_NOWAIT);
if (mc == NULL)
return (ENOMEM);
mc->mc_ifma = rifma;
SLIST_INSERT_HEAD(&lp->lp_mc_head, mc, mc_entries);
}
} else {
while ((mc = SLIST_FIRST(&lp->lp_mc_head)) != NULL) {
SLIST_REMOVE(&lp->lp_mc_head, mc, lagg_mc, mc_entries);
if_delmulti_ifma(mc->mc_ifma);
free(mc, M_DEVBUF);
}
}
return (0);
}
/* Handle a ref counted flag that should be set on the lagg port as well */
static int
lagg_setflag(struct lagg_port *lp, int flag, int status,
int (*func)(struct ifnet *, int))
{
struct lagg_softc *sc = lp->lp_softc;
struct ifnet *scifp = sc->sc_ifp;
struct ifnet *ifp = lp->lp_ifp;
int error;
LAGG_WLOCK_ASSERT(sc);
status = status ? (scifp->if_flags & flag) : 0;
/* Now "status" contains the flag value or 0 */
/*
* See if recorded ports status is different from what
* we want it to be. If it is, flip it. We record ports
* status in lp_ifflags so that we won't clear ports flag
* we haven't set. In fact, we don't clear or set ports
* flags directly, but get or release references to them.
* That's why we can be sure that recorded flags still are
* in accord with actual ports flags.
*/
if (status != (lp->lp_ifflags & flag)) {
error = (*func)(ifp, status);
if (error)
return (error);
lp->lp_ifflags &= ~flag;
lp->lp_ifflags |= status;
}
return (0);
}
/*
* Handle IFF_* flags that require certain changes on the lagg port
* if "status" is true, update ports flags respective to the lagg
* if "status" is false, forcedly clear the flags set on port.
*/
static int
lagg_setflags(struct lagg_port *lp, int status)
{
int error, i;
for (i = 0; lagg_pflags[i].flag; i++) {
error = lagg_setflag(lp, lagg_pflags[i].flag,
status, lagg_pflags[i].func);
if (error)
return (error);
}
return (0);
}
static int
lagg_transmit(struct ifnet *ifp, struct mbuf *m)
{
struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
int error, len, mcast;
len = m->m_pkthdr.len;
mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0;
LAGG_RLOCK(sc);
/* We need a Tx algorithm and at least one port */
if (sc->sc_proto == LAGG_PROTO_NONE || sc->sc_count == 0) {
LAGG_RUNLOCK(sc);
m_freem(m);
ifp->if_oerrors++;
return (ENXIO);
}
ETHER_BPF_MTAP(ifp, m);
error = (*sc->sc_start)(sc, m);
LAGG_RUNLOCK(sc);
if (error == 0) {
counter_u64_add(sc->sc_opackets, 1);
counter_u64_add(sc->sc_obytes, len);
ifp->if_omcasts += mcast;
} else
ifp->if_oerrors++;
return (error);
}
/*
* The ifp->if_qflush entry point for lagg(4) is no-op.
*/
static void
lagg_qflush(struct ifnet *ifp __unused)
{
}
static struct mbuf *
lagg_input(struct ifnet *ifp, struct mbuf *m)
{
struct lagg_port *lp = ifp->if_lagg;
struct lagg_softc *sc = lp->lp_softc;
struct ifnet *scifp = sc->sc_ifp;
LAGG_RLOCK(sc);
if ((scifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
(lp->lp_flags & LAGG_PORT_DISABLED) ||
sc->sc_proto == LAGG_PROTO_NONE) {
LAGG_RUNLOCK(sc);
m_freem(m);
return (NULL);
}
ETHER_BPF_MTAP(scifp, m);
m = (*sc->sc_input)(sc, lp, m);
if (m != NULL) {
counter_u64_add(sc->sc_ipackets, 1);
counter_u64_add(sc->sc_ibytes, m->m_pkthdr.len);
if (scifp->if_flags & IFF_MONITOR) {
m_freem(m);
m = NULL;
}
}
LAGG_RUNLOCK(sc);
return (m);
}
static int
lagg_media_change(struct ifnet *ifp)
{
struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
if (sc->sc_ifflags & IFF_DEBUG)
printf("%s\n", __func__);
/* Ignore */
return (0);
}
static void
lagg_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
struct lagg_port *lp;
imr->ifm_status = IFM_AVALID;
imr->ifm_active = IFM_ETHER | IFM_AUTO;
LAGG_RLOCK(sc);
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
if (LAGG_PORTACTIVE(lp))
imr->ifm_status |= IFM_ACTIVE;
}
LAGG_RUNLOCK(sc);
}
static void
lagg_linkstate(struct lagg_softc *sc)
{
struct lagg_port *lp;
int new_link = LINK_STATE_DOWN;
uint64_t speed;
/* Our link is considered up if at least one of our ports is active */
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
if (lp->lp_link_state == LINK_STATE_UP) {
new_link = LINK_STATE_UP;
break;
}
}
if_link_state_change(sc->sc_ifp, new_link);
/* Update if_baudrate to reflect the max possible speed */
switch (sc->sc_proto) {
case LAGG_PROTO_FAILOVER:
sc->sc_ifp->if_baudrate = sc->sc_primary != NULL ?
sc->sc_primary->lp_ifp->if_baudrate : 0;
break;
case LAGG_PROTO_ROUNDROBIN:
case LAGG_PROTO_LOADBALANCE:
case LAGG_PROTO_ETHERCHANNEL:
speed = 0;
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
speed += lp->lp_ifp->if_baudrate;
sc->sc_ifp->if_baudrate = speed;
break;
case LAGG_PROTO_LACP:
/* LACP updates if_baudrate itself */
break;
}
}
static void
lagg_port_state(struct ifnet *ifp, int state)
{
struct lagg_port *lp = (struct lagg_port *)ifp->if_lagg;
struct lagg_softc *sc = NULL;
if (lp != NULL)
sc = lp->lp_softc;
if (sc == NULL)
return;
LAGG_WLOCK(sc);
lagg_linkstate(sc);
if (sc->sc_linkstate != NULL)
(*sc->sc_linkstate)(lp);
LAGG_WUNLOCK(sc);
}
struct lagg_port *
lagg_link_active(struct lagg_softc *sc, struct lagg_port *lp)
{
struct lagg_port *lp_next, *rval = NULL;
// int new_link = LINK_STATE_DOWN;
LAGG_RLOCK_ASSERT(sc);
/*
* Search a port which reports an active link state.
*/
if (lp == NULL)
goto search;
if (LAGG_PORTACTIVE(lp)) {
rval = lp;
goto found;
}
if ((lp_next = SLIST_NEXT(lp, lp_entries)) != NULL &&
LAGG_PORTACTIVE(lp_next)) {
rval = lp_next;
goto found;
}
search:
SLIST_FOREACH(lp_next, &sc->sc_ports, lp_entries) {
if (LAGG_PORTACTIVE(lp_next)) {
rval = lp_next;
goto found;
}
}
found:
if (rval != NULL) {
/*
* The IEEE 802.1D standard assumes that a lagg with
* multiple ports is always full duplex. This is valid
* for load sharing laggs and if at least two links
* are active. Unfortunately, checking the latter would
* be too expensive at this point.
XXX
if ((sc->sc_capabilities & IFCAP_LAGG_FULLDUPLEX) &&
(sc->sc_count > 1))
new_link = LINK_STATE_FULL_DUPLEX;
else
new_link = rval->lp_link_state;
*/
}
return (rval);
}
static const void *
lagg_gethdr(struct mbuf *m, u_int off, u_int len, void *buf)
{
if (m->m_pkthdr.len < (off + len)) {
return (NULL);
} else if (m->m_len < (off + len)) {
m_copydata(m, off, len, buf);
return (buf);
}
return (mtod(m, char *) + off);
}
static int
lagg_sysctl_active(SYSCTL_HANDLER_ARGS)
{
struct lagg_softc *sc = (struct lagg_softc *)arg1;
struct lagg_port *lp;
int error;
/* LACP tracks active links automatically, the others do not */
if (sc->sc_proto != LAGG_PROTO_LACP) {
sc->sc_active = 0;
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
sc->sc_active += LAGG_PORTACTIVE(lp);
}
error = sysctl_handle_int(oidp, &sc->sc_active, 0, req);
if ((error) || (req->newptr == NULL))
return (error);
return (0);
}
uint32_t
lagg_hashmbuf(struct lagg_softc *sc, struct mbuf *m, uint32_t key)
{
uint16_t etype;
uint32_t p = key;
int off;
struct ether_header *eh;
const struct ether_vlan_header *vlan;
#ifdef INET
const struct ip *ip;
const uint32_t *ports;
int iphlen;
#endif
#ifdef INET6
const struct ip6_hdr *ip6;
uint32_t flow;
#endif
union {
#ifdef INET
struct ip ip;
#endif
#ifdef INET6
struct ip6_hdr ip6;
#endif
struct ether_vlan_header vlan;
uint32_t port;
} buf;
off = sizeof(*eh);
if (m->m_len < off)
goto out;
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
if (sc->sc_flags & LAGG_F_HASHL2) {
p = hash32_buf(&eh->ether_shost, ETHER_ADDR_LEN, p);
p = hash32_buf(&eh->ether_dhost, ETHER_ADDR_LEN, p);
}
/* Special handling for encapsulating VLAN frames */
if ((m->m_flags & M_VLANTAG) && (sc->sc_flags & LAGG_F_HASHL2)) {
p = hash32_buf(&m->m_pkthdr.ether_vtag,
sizeof(m->m_pkthdr.ether_vtag), p);
} else if (etype == ETHERTYPE_VLAN) {
vlan = lagg_gethdr(m, off, sizeof(*vlan), &buf);
if (vlan == NULL)
goto out;
if (sc->sc_flags & LAGG_F_HASHL2)
p = hash32_buf(&vlan->evl_tag, sizeof(vlan->evl_tag), p);
etype = ntohs(vlan->evl_proto);
off += sizeof(*vlan) - sizeof(*eh);
}
switch (etype) {
#ifdef INET
case ETHERTYPE_IP:
ip = lagg_gethdr(m, off, sizeof(*ip), &buf);
if (ip == NULL)
goto out;
if (sc->sc_flags & LAGG_F_HASHL3) {
p = hash32_buf(&ip->ip_src, sizeof(struct in_addr), p);
p = hash32_buf(&ip->ip_dst, sizeof(struct in_addr), p);
}
if (!(sc->sc_flags & LAGG_F_HASHL4))
break;
switch (ip->ip_p) {
case IPPROTO_TCP:
case IPPROTO_UDP:
case IPPROTO_SCTP:
iphlen = ip->ip_hl << 2;
if (iphlen < sizeof(*ip))
break;
off += iphlen;
ports = lagg_gethdr(m, off, sizeof(*ports), &buf);
if (ports == NULL)
break;
p = hash32_buf(ports, sizeof(*ports), p);
break;
}
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
if (!(sc->sc_flags & LAGG_F_HASHL3))
break;
ip6 = lagg_gethdr(m, off, sizeof(*ip6), &buf);
if (ip6 == NULL)
goto out;
p = hash32_buf(&ip6->ip6_src, sizeof(struct in6_addr), p);
p = hash32_buf(&ip6->ip6_dst, sizeof(struct in6_addr), p);
flow = ip6->ip6_flow & IPV6_FLOWLABEL_MASK;
p = hash32_buf(&flow, sizeof(flow), p); /* IPv6 flow label */
break;
#endif
}
out:
return (p);
}
int
lagg_enqueue(struct ifnet *ifp, struct mbuf *m)
{
return (ifp->if_transmit)(ifp, m);
}
/*
* Simple round robin aggregation
*/
static int
lagg_rr_attach(struct lagg_softc *sc)
{
sc->sc_detach = lagg_rr_detach;
sc->sc_start = lagg_rr_start;
sc->sc_input = lagg_rr_input;
sc->sc_port_create = NULL;
sc->sc_capabilities = IFCAP_LAGG_FULLDUPLEX;
sc->sc_seq = 0;
return (0);
}
static int
lagg_rr_detach(struct lagg_softc *sc)
{
return (0);
}
static int
lagg_rr_start(struct lagg_softc *sc, struct mbuf *m)
{
struct lagg_port *lp;
uint32_t p;
p = atomic_fetchadd_32(&sc->sc_seq, 1);
p %= sc->sc_count;
lp = SLIST_FIRST(&sc->sc_ports);
while (p--)
lp = SLIST_NEXT(lp, lp_entries);
/*
* Check the port's link state. This will return the next active
* port if the link is down or the port is NULL.
*/
if ((lp = lagg_link_active(sc, lp)) == NULL) {
m_freem(m);
return (ENETDOWN);
}
/* Send mbuf */
return (lagg_enqueue(lp->lp_ifp, m));
}
static struct mbuf *
lagg_rr_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
{
struct ifnet *ifp = sc->sc_ifp;
/* Just pass in the packet to our lagg device */
m->m_pkthdr.rcvif = ifp;
return (m);
}
/*
* Active failover
*/
static int
lagg_fail_attach(struct lagg_softc *sc)
{
sc->sc_detach = lagg_fail_detach;
sc->sc_start = lagg_fail_start;
sc->sc_input = lagg_fail_input;
sc->sc_port_create = NULL;
sc->sc_port_destroy = NULL;
return (0);
}
static int
lagg_fail_detach(struct lagg_softc *sc)
{
return (0);
}
static int
lagg_fail_start(struct lagg_softc *sc, struct mbuf *m)
{
struct lagg_port *lp;
/* Use the master port if active or the next available port */
if ((lp = lagg_link_active(sc, sc->sc_primary)) == NULL) {
m_freem(m);
return (ENETDOWN);
}
/* Send mbuf */
return (lagg_enqueue(lp->lp_ifp, m));
}
static struct mbuf *
lagg_fail_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
{
struct ifnet *ifp = sc->sc_ifp;
struct lagg_port *tmp_tp;
if (lp == sc->sc_primary || lagg_failover_rx_all) {
m->m_pkthdr.rcvif = ifp;
return (m);
}
if (!LAGG_PORTACTIVE(sc->sc_primary)) {
tmp_tp = lagg_link_active(sc, sc->sc_primary);
/*
* If tmp_tp is null, we've recieved a packet when all
* our links are down. Weird, but process it anyways.
*/
if ((tmp_tp == NULL || tmp_tp == lp)) {
m->m_pkthdr.rcvif = ifp;
return (m);
}
}
m_freem(m);
return (NULL);
}
/*
* Loadbalancing
*/
static int
lagg_lb_attach(struct lagg_softc *sc)
{
struct lagg_port *lp;
struct lagg_lb *lb;
if ((lb = (struct lagg_lb *)malloc(sizeof(struct lagg_lb),
M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
return (ENOMEM);
sc->sc_detach = lagg_lb_detach;
sc->sc_start = lagg_lb_start;
sc->sc_input = lagg_lb_input;
sc->sc_port_create = lagg_lb_port_create;
sc->sc_port_destroy = lagg_lb_port_destroy;
sc->sc_capabilities = IFCAP_LAGG_FULLDUPLEX;
lb->lb_key = arc4random();
sc->sc_psc = (caddr_t)lb;
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
lagg_lb_port_create(lp);
return (0);
}
static int
lagg_lb_detach(struct lagg_softc *sc)
{
struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
if (lb != NULL)
free(lb, M_DEVBUF);
return (0);
}
static int
lagg_lb_porttable(struct lagg_softc *sc, struct lagg_port *lp)
{
struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
struct lagg_port *lp_next;
int i = 0;
bzero(&lb->lb_ports, sizeof(lb->lb_ports));
SLIST_FOREACH(lp_next, &sc->sc_ports, lp_entries) {
if (lp_next == lp)
continue;
if (i >= LAGG_MAX_PORTS)
return (EINVAL);
if (sc->sc_ifflags & IFF_DEBUG)
printf("%s: port %s at index %d\n",
sc->sc_ifname, lp_next->lp_ifname, i);
lb->lb_ports[i++] = lp_next;
}
return (0);
}
static int
lagg_lb_port_create(struct lagg_port *lp)
{
struct lagg_softc *sc = lp->lp_softc;
return (lagg_lb_porttable(sc, NULL));
}
static void
lagg_lb_port_destroy(struct lagg_port *lp)
{
struct lagg_softc *sc = lp->lp_softc;
lagg_lb_porttable(sc, lp);
}
static int
lagg_lb_start(struct lagg_softc *sc, struct mbuf *m)
{
struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
struct lagg_port *lp = NULL;
uint32_t p = 0;
if (sc->use_flowid && (m->m_flags & M_FLOWID))
p = m->m_pkthdr.flowid;
else
p = lagg_hashmbuf(sc, m, lb->lb_key);
p %= sc->sc_count;
lp = lb->lb_ports[p];
/*
* Check the port's link state. This will return the next active
* port if the link is down or the port is NULL.
*/
if ((lp = lagg_link_active(sc, lp)) == NULL) {
m_freem(m);
return (ENETDOWN);
}
/* Send mbuf */
return (lagg_enqueue(lp->lp_ifp, m));
}
static struct mbuf *
lagg_lb_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
{
struct ifnet *ifp = sc->sc_ifp;
/* Just pass in the packet to our lagg device */
m->m_pkthdr.rcvif = ifp;
return (m);
}
/*
* 802.3ad LACP
*/
static int
lagg_lacp_attach(struct lagg_softc *sc)
{
struct lagg_port *lp;
int error;
sc->sc_detach = lagg_lacp_detach;
sc->sc_port_create = lacp_port_create;
sc->sc_port_destroy = lacp_port_destroy;
sc->sc_linkstate = lacp_linkstate;
sc->sc_start = lagg_lacp_start;
sc->sc_input = lagg_lacp_input;
sc->sc_init = lacp_init;
sc->sc_stop = lacp_stop;
sc->sc_lladdr = lagg_lacp_lladdr;
sc->sc_req = lacp_req;
sc->sc_portreq = lacp_portreq;
error = lacp_attach(sc);
if (error)
return (error);
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
lacp_port_create(lp);
return (error);
}
static int
lagg_lacp_detach(struct lagg_softc *sc)
{
struct lagg_port *lp;
int error;
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
lacp_port_destroy(lp);
/* unlocking is safe here */
LAGG_WUNLOCK(sc);
error = lacp_detach(sc);
LAGG_WLOCK(sc);
return (error);
}
static void
lagg_lacp_lladdr(struct lagg_softc *sc)
{
struct lagg_port *lp;
/* purge all the lacp ports */
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
lacp_port_destroy(lp);
/* add them back in */
SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
lacp_port_create(lp);
}
static int
lagg_lacp_start(struct lagg_softc *sc, struct mbuf *m)
{
struct lagg_port *lp;
lp = lacp_select_tx_port(sc, m);
if (lp == NULL) {
m_freem(m);
return (ENETDOWN);
}
/* Send mbuf */
return (lagg_enqueue(lp->lp_ifp, m));
}
static struct mbuf *
lagg_lacp_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
{
struct ifnet *ifp = sc->sc_ifp;
struct ether_header *eh;
u_short etype;
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
/* Tap off LACP control messages */
if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_SLOW) {
m = lacp_input(lp, m);
if (m == NULL)
return (NULL);
}
/*
* If the port is not collecting or not in the active aggregator then
* free and return.
*/
if (lacp_iscollecting(lp) == 0 || lacp_isactive(lp) == 0) {
m_freem(m);
return (NULL);
}
m->m_pkthdr.rcvif = ifp;
return (m);
}
static void
lagg_callout(void *arg)
{
struct lagg_softc *sc = (struct lagg_softc *)arg;
struct ifnet *ifp = sc->sc_ifp;
ifp->if_ipackets = counter_u64_fetch(sc->sc_ipackets);
ifp->if_opackets = counter_u64_fetch(sc->sc_opackets);
ifp->if_ibytes = counter_u64_fetch(sc->sc_ibytes);
ifp->if_obytes = counter_u64_fetch(sc->sc_obytes);
callout_reset(&sc->sc_callout, hz, lagg_callout, sc);
}
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