kvmtool: Introduce downscript option for virtio-net
To detach tap device automatically from bridge when exiting,
just like what the reverse of "script" does.
Signed-off-by: Fan Du <fan.du@intel.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/include/kvm/virtio-net.h b/include/kvm/virtio-net.h
index f435cc3..d136a09 100644
--- a/include/kvm/virtio-net.h
+++ b/include/kvm/virtio-net.h
@@ -9,6 +9,7 @@
const char *guest_ip;
const char *host_ip;
const char *script;
+ const char *downscript;
const char *trans;
const char *tapif;
char guest_mac[6];
diff --git a/virtio/net.c b/virtio/net.c
index 4a6a855..6d1be65 100644
--- a/virtio/net.c
+++ b/virtio/net.c
@@ -294,10 +294,29 @@
return ret;
}
+static int virtio_net_exec_script(const char* script, const char *tap_name)
+{
+ pid_t pid;
+ int status;
+
+ pid = fork();
+ if (pid == 0) {
+ execl(script, script, tap_name, NULL);
+ _exit(1);
+ } else {
+ waitpid(pid, &status, 0);
+ if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
+ pr_warning("Fail to setup tap by %s", script);
+ return -1;
+ }
+ }
+ return 0;
+}
+
static bool virtio_net__tap_init(struct net_dev *ndev)
{
int sock = socket(AF_INET, SOCK_STREAM, 0);
- int pid, status, offload, hdr_len;
+ int offload, hdr_len;
struct sockaddr_in sin = {0};
struct ifreq ifr;
const struct virtio_net_params *params = ndev->params;
@@ -339,17 +358,8 @@
}
if (strcmp(params->script, "none")) {
- pid = fork();
- if (pid == 0) {
- execl(params->script, params->script, ndev->tap_name, NULL);
- _exit(1);
- } else {
- waitpid(pid, &status, 0);
- if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
- pr_warning("Fail to setup tap by %s", params->script);
- goto fail;
- }
- }
+ if (virtio_net_exec_script(params->script, ndev->tap_name) < 0)
+ goto fail;
} else if (!skipconf) {
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ndev->tap_name));
@@ -702,6 +712,8 @@
die("Unknown network mode %s, please use user, tap or none", kvm->cfg.network);
} else if (strcmp(param, "script") == 0) {
p->script = strdup(val);
+ } else if (strcmp(param, "downscript") == 0) {
+ p->downscript = strdup(val);
} else if (strcmp(param, "guest_ip") == 0) {
p->guest_ip = strdup(val);
} else if (strcmp(param, "host_ip") == 0) {
@@ -740,6 +752,7 @@
.guest_ip = DEFAULT_GUEST_ADDR,
.host_ip = DEFAULT_HOST_ADDR,
.script = DEFAULT_SCRIPT,
+ .downscript = DEFAULT_SCRIPT,
.mode = NET_MODE_TAP,
};
@@ -877,6 +890,18 @@
int virtio_net__exit(struct kvm *kvm)
{
+ struct virtio_net_params *params;
+ struct net_dev *ndev;
+ struct list_head *ptr;
+
+ list_for_each(ptr, &ndevs) {
+ ndev = list_entry(ptr, struct net_dev, list);
+ params = ndev->params;
+ /* Cleanup any tap device which attached to bridge */
+ if (ndev->mode == NET_MODE_TAP &&
+ strcmp(params->downscript, "none"))
+ virtio_net_exec_script(params->downscript, ndev->tap_name);
+ }
return 0;
}
virtio_dev_exit(virtio_net__exit);
