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authorBjoern A. Zeeb <bz@FreeBSD.org>2021-07-28 22:53:25 +0000
committerBjoern A. Zeeb <bz@FreeBSD.org>2021-08-01 20:50:53 +0000
commit56be282bc999cc05dcd1ccb163b108d54f3ff448 (patch)
treef6fd64db641894f0d7b1291885bc0342fe0a177a
parentfd2a4a31d9df9beb793c892af72aeb1c1bf5dd42 (diff)
downloadsrc-main.tar.gz
src-main.zip
bhyve: net_backends, automatically IFF_UP tap devicesHEADmain
If you want communications with the outside world and tell bhyve to create an interfaces then it should be usable as well. Rather than relying on the sysctl net.link.tap.up_on_open automatically try to IFF_UP the opened tap device. MFC after: 10 days Reviewed by: markj, grehan Differential Revision: https://reviews.freebsd.org/D31342
-rw-r--r--usr.sbin/bhyve/net_backends.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/usr.sbin/bhyve/net_backends.c b/usr.sbin/bhyve/net_backends.c
index 30c26aea458b..cb1730fc77df 100644
--- a/usr.sbin/bhyve/net_backends.c
+++ b/usr.sbin/bhyve/net_backends.c
@@ -46,6 +46,9 @@ __FBSDID("$FreeBSD$");
#include <sys/uio.h>
#include <net/if.h>
+#if defined(INET6) || defined(INET)
+#include <net/if_tap.h>
+#endif
#include <net/netmap.h>
#include <net/netmap_virt.h>
#define NETMAP_WITH_LIBS
@@ -179,6 +182,17 @@ SET_DECLARE(net_backend_set, struct net_backend);
* The tap backend
*/
+#if defined(INET6) || defined(INET)
+const int pf_list[] = {
+#if defined(INET6)
+ PF_INET6,
+#endif
+#if defined(INET)
+ PF_INET,
+#endif
+};
+#endif
+
struct tap_priv {
struct mevent *mevp;
/*
@@ -211,6 +225,10 @@ tap_init(struct net_backend *be, const char *devname,
struct tap_priv *priv = (struct tap_priv *)be->opaque;
char tbuf[80];
int opt = 1;
+#if defined(INET6) || defined(INET)
+ struct ifreq ifrq;
+ int i, s;
+#endif
#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;
#endif
@@ -238,6 +256,39 @@ tap_init(struct net_backend *be, const char *devname,
goto error;
}
+#if defined(INET6) || defined(INET)
+ /*
+ * Try to UP the interface rather than relying on
+ * net.link.tap.up_on_open.
+ */
+ bzero(&ifrq, sizeof(ifrq));
+ if (ioctl(be->fd, TAPGIFNAME, &ifrq) < 0) {
+ WPRINTF(("Could not get interface name"));
+ goto error;
+ }
+
+ s = -1;
+ for (i = 0; s == -1 && i < nitems(pf_list); i++)
+ s = socket(pf_list[i], SOCK_DGRAM, 0);
+ if (s == -1) {
+ WPRINTF(("Could open socket"));
+ goto error;
+ }
+
+ if (ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) {
+ (void)close(s);
+ WPRINTF(("Could not get interface flags"));
+ goto error;
+ }
+ ifrq.ifr_flags |= IFF_UP;
+ if (ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) {
+ (void)close(s);
+ WPRINTF(("Could not set interface flags"));
+ goto error;
+ }
+ (void)close(s);
+#endif
+
#ifndef WITHOUT_CAPSICUM
cap_rights_init(&rights, CAP_EVENT, CAP_READ, CAP_WRITE);
if (caph_rights_limit(be->fd, &rights) == -1)