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bhyve: net_backends, automatically IFF_UP tap devices

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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
This commit is contained in:
Bjoern A. Zeeb 2021-07-28 22:53:25 +00:00
parent fd2a4a31d9
commit 56be282bc9
1 changed files with 51 additions and 0 deletions
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51
usr.sbin/bhyve/net_backends.c
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@ -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)