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Index: qemu/vl.c
@@ -41,6 +41,9 @@
#ifdef _BSD
#include <sys/stat.h>
#include <libutil.h>
+#ifdef __FreeBSD__
+#include <sys/module.h>
+#endif
#else
#include <linux/if.h>
#include <linux/if_tun.h>
@@ -1059,6 +1062,34 @@
#endif /* CONFIG_SLIRP */
+#ifdef __FreeBSD__
+#define LOAD_QUIETLY 1
+#define LOAD_VERBOSLY 2
+
+int
+loadmodules(int how, const char *module, ...)
+{
+ int loaded = 0;
+ va_list ap;
+
+ va_start(ap, module);
+#ifndef NO_MODULES
+ while (module != NULL) {
+ if (modfind(module) == -1) {
+ if (kldload(module) == -1) {
+ if (how == LOAD_VERBOSLY)
+ fprintf(stderr, "%s: Cannot load module\n", module);
+ } else
+ loaded++;
+ }
+ module = va_arg(ap, const char *);
+ }
+ va_end(ap);
+#endif
+ return loaded;
+}
+#endif
+
#if !defined(_WIN32)
#ifdef _BSD
static int tun_open(char *ifname, int ifname_size)
@@ -1067,11 +1098,55 @@
char *dev;
struct stat s;
+#ifdef __FreeBSD__
+ int i, kldtried = 0, enoentcount = 0, err = 0;
+ char dname[100];
+#ifdef USE_DEVTAP
+ /*
+ * 5.x has /dev/tap, but that seems to just blindly increase its
+ * couter on every open() for some people(??), i.e. on every qemu run.
+ */
+ i = -1;
+#else
+ i = 0;
+#endif
+ for (; i < 10; i++) {
+ if (i == -1)
+ strcpy(dname, "/dev/tap");
+ else
+ snprintf(dname, sizeof dname, "%s%d",
+ "/dev/tap", i);
+ fd = open(dname, O_RDWR);
+ if (fd >= 0)
+ break;
+ else if (errno == ENXIO || errno == ENOENT) {
+ if (i == 0 && !kldtried++) {
+ /*
+ * Attempt to load the tunnel interface KLD if it isn't loaded
+ * already.
+ */
+ if (loadmodules(LOAD_VERBOSLY, "if_tap", NULL))
+ i = -1;
+ continue;
+ }
+ if (errno != ENOENT || ++enoentcount > 3) {
+ err = errno;
+ break;
+ }
+ } else
+ err = errno;
+ }
+ if (fd < 0) {
+ fprintf(stderr, "warning: could not open %s (%s): no virtual network emulation\n", dname, strerror(err));
+ return -1;
+ }
+#else
fd = open("/dev/tap", O_RDWR);
if (fd < 0) {
- fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
+ fprintf(stderr, "warning: could not open /dev/tap (%s): no virtual network emulation\n", strerror(errno));
return -1;
}
+#endif
fstat(fd, &s);
dev = devname(s.st_rdev, S_IFCHR);
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