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Make shmif SIMPLEX

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Add a sender field to a packet header on a shmif bus to identify
and ignore packets sent by itself.

This makes shmif work with bridges.

ok pooka@
This commit is contained in:
ozaki-r 2014-08-15 15:03:03 +00:00
parent 912cfee7bf
commit 5c34a7158d
2 changed files with 13 additions and 5 deletions
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14
sys/rump/net/lib/libshmif/if_shmem.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_shmem.c,v 1.62 2014/08/09 09:43:49 ozaki-r Exp $ */
/* $NetBSD: if_shmem.c,v 1.63 2014/08/15 15:03:03 ozaki-r Exp $ */
/*
* Copyright (c) 2009, 2010 Antti Kantee. All Rights Reserved.
@ -28,7 +28,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_shmem.c,v 1.62 2014/08/09 09:43:49 ozaki-r Exp $");
__KERNEL_RCSID(0, "$NetBSD: if_shmem.c,v 1.63 2014/08/15 15:03:03 ozaki-r Exp $");
#include <sys/param.h>
#include <sys/atomic.h>
@ -97,6 +97,8 @@ struct shmif_sc {
struct lwp *sc_rcvl;
bool sc_dying;
uint64_t sc_uuid;
};
static void shmif_rcv(void *);
@ -167,12 +169,13 @@ allocif(int unit, struct shmif_sc **scp)
sc = kmem_zalloc(sizeof(*sc), KM_SLEEP);
sc->sc_memfd = -1;
sc->sc_unit = unit;
sc->sc_uuid = cprng_fast64();
ifp = &sc->sc_ec.ec_if;
snprintf(ifp->if_xname, sizeof(ifp->if_xname), "shmif%d", unit);
ifp->if_softc = sc;
ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_init = shmif_init;
ifp->if_ioctl = shmif_ioctl;
ifp->if_start = shmif_start;
@ -540,6 +543,7 @@ shmif_start(struct ifnet *ifp)
sp.sp_len = pktsize;
sp.sp_sec = tv.tv_sec;
sp.sp_usec = tv.tv_usec;
sp.sp_sender = sc->sc_uuid;
bpf_mtap(ifp, m0);
@ -743,7 +747,9 @@ shmif_rcv(void *arg)
* Test if we want to pass the packet upwards
*/
eth = mtod(m, struct ether_header *);
if (memcmp(eth->ether_dhost, CLLADDR(ifp->if_sadl),
if (sp.sp_sender == sc->sc_uuid) {
passup = false;
} else if (memcmp(eth->ether_dhost, CLLADDR(ifp->if_sadl),
ETHER_ADDR_LEN) == 0) {
passup = true;
} else if (ETHER_IS_MULTICAST(eth->ether_dhost)) {

4
sys/rump/net/lib/libshmif/shmifvar.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: shmifvar.h,v 1.7 2013/12/20 09:06:35 pooka Exp $ */
/* $NetBSD: shmifvar.h,v 1.8 2014/08/15 15:03:03 ozaki-r Exp $ */
/*-
* Copyright (c) 2009, 2010 Antti Kantee. All Rights Reserved.
@ -56,6 +56,8 @@ struct shmif_pkthdr {
uint32_t sp_sec;
uint32_t sp_usec;
uint64_t sp_sender;
};
#define BUSMEM_SIZE (1024*1024)