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diff --git a/usr.sbin/bhyve/net_backends.c b/usr.sbin/bhyve/net_backends.c
--- a/usr.sbin/bhyve/net_backends.c
+++ b/usr.sbin/bhyve/net_backends.c
@@ -168,10 +168,12 @@
/* Size of backend-specific private data. */
size_t priv_size;
- /* Room for backend-specific data. */
- char opaque[0];
+ /* Backend-specific private data follows. */
};
+#define NET_BE_PRIV(be) ((void *)((be) + 1))
+#define NET_BE_SIZE(be) (sizeof(*be) + (be)->priv_size)
+
SET_DECLARE(net_backend_set, struct net_backend);
#define VNET_HDR_LEN sizeof(struct virtio_net_rxhdr)
@@ -207,7 +209,7 @@
static void
tap_cleanup(struct net_backend *be)
{
- struct tap_priv *priv = (struct tap_priv *)be->opaque;
+ struct tap_priv *priv = NET_BE_PRIV(be);
if (priv->mevp) {
mevent_delete(priv->mevp);
@@ -222,7 +224,7 @@
tap_init(struct net_backend *be, const char *devname,
nvlist_t *nvl __unused, net_be_rxeof_t cb, void *param)
{
- struct tap_priv *priv = (struct tap_priv *)be->opaque;
+ struct tap_priv *priv = NET_BE_PRIV(be);
char tbuf[80];
int opt = 1;
#if defined(INET6) || defined(INET)
@@ -323,7 +325,7 @@
static ssize_t
tap_peek_recvlen(struct net_backend *be)
{
- struct tap_priv *priv = (struct tap_priv *)be->opaque;
+ struct tap_priv *priv = NET_BE_PRIV(be);
ssize_t ret;
if (priv->bbuflen > 0) {
@@ -353,7 +355,7 @@
static ssize_t
tap_recv(struct net_backend *be, const struct iovec *iov, int iovcnt)
{
- struct tap_priv *priv = (struct tap_priv *)be->opaque;
+ struct tap_priv *priv = NET_BE_PRIV(be);
ssize_t ret;
if (priv->bbuflen > 0) {
@@ -381,7 +383,7 @@
static void
tap_recv_enable(struct net_backend *be)
{
- struct tap_priv *priv = (struct tap_priv *)be->opaque;
+ struct tap_priv *priv = NET_BE_PRIV(be);
mevent_enable(priv->mevp);
}
@@ -389,7 +391,7 @@
static void
tap_recv_disable(struct net_backend *be)
{
- struct tap_priv *priv = (struct tap_priv *)be->opaque;
+ struct tap_priv *priv = NET_BE_PRIV(be);
mevent_disable(priv->mevp);
}
@@ -453,7 +455,7 @@
ng_init(struct net_backend *be, const char *devname __unused,
nvlist_t *nvl, net_be_rxeof_t cb, void *param)
{
- struct tap_priv *p = (struct tap_priv *)be->opaque;
+ struct tap_priv *p = NET_BE_PRIV(be);
struct ngm_connect ngc;
const char *value, *nodename;
int sbsz;
@@ -629,7 +631,7 @@
{
int err;
struct nmreq req;
- struct netmap_priv *priv = (struct netmap_priv *)be->opaque;
+ struct netmap_priv *priv = NET_BE_PRIV(be);
nmreq_init(&req, priv->ifname);
req.nr_cmd = NETMAP_BDG_VNET_HDR;
@@ -686,7 +688,7 @@
netmap_init(struct net_backend *be, const char *devname,
nvlist_t *nvl __unused, net_be_rxeof_t cb, void *param)
{
- struct netmap_priv *priv = (struct netmap_priv *)be->opaque;
+ struct netmap_priv *priv = NET_BE_PRIV(be);
strlcpy(priv->ifname, devname, sizeof(priv->ifname));
priv->ifname[sizeof(priv->ifname) - 1] = '\0';
@@ -717,7 +719,7 @@
static void
netmap_cleanup(struct net_backend *be)
{
- struct netmap_priv *priv = (struct netmap_priv *)be->opaque;
+ struct netmap_priv *priv = NET_BE_PRIV(be);
if (priv->mevp) {
mevent_delete(priv->mevp);
@@ -732,7 +734,7 @@
netmap_send(struct net_backend *be, const struct iovec *iov,
int iovcnt)
{
- struct netmap_priv *priv = (struct netmap_priv *)be->opaque;
+ struct netmap_priv *priv = NET_BE_PRIV(be);
struct netmap_ring *ring;
ssize_t totlen = 0;
int nm_buf_size;
@@ -811,7 +813,7 @@
static ssize_t
netmap_peek_recvlen(struct net_backend *be)
{
- struct netmap_priv *priv = (struct netmap_priv *)be->opaque;
+ struct netmap_priv *priv = NET_BE_PRIV(be);
struct netmap_ring *ring = priv->rx;
uint32_t head = ring->head;
ssize_t totlen = 0;
@@ -831,7 +833,7 @@
static ssize_t
netmap_recv(struct net_backend *be, const struct iovec *iov, int iovcnt)
{
- struct netmap_priv *priv = (struct netmap_priv *)be->opaque;
+ struct netmap_priv *priv = NET_BE_PRIV(be);
struct netmap_slot *slot = NULL;
struct netmap_ring *ring;
uint8_t *iov_frag_buf;
@@ -898,7 +900,7 @@
static void
netmap_recv_enable(struct net_backend *be)
{
- struct netmap_priv *priv = (struct netmap_priv *)be->opaque;
+ struct netmap_priv *priv = NET_BE_PRIV(be);
mevent_enable(priv->mevp);
}
@@ -906,7 +908,7 @@
static void
netmap_recv_disable(struct net_backend *be)
{
- struct netmap_priv *priv = (struct netmap_priv *)be->opaque;
+ struct netmap_priv *priv = NET_BE_PRIV(be);
mevent_disable(priv->mevp);
}
@@ -1021,7 +1023,7 @@
return (EINVAL);
}
- nbe = calloc(1, sizeof(*nbe) + tbe->priv_size);
+ nbe = calloc(1, NET_BE_SIZE(tbe));
*nbe = *tbe; /* copy the template */
nbe->fd = -1;
nbe->sc = param;

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