static bool create_nic(char *nic, char *br, int pid, char **cnic)
{
char *veth1buf, *veth2buf;
veth1buf = alloca(IFNAMSIZ);
veth2buf = alloca(IFNAMSIZ);
int ret, mtu;
ret = snprintf(veth1buf, IFNAMSIZ, "%s", nic);
if (ret < 0 || ret >= IFNAMSIZ) {
fprintf(stderr, "host nic name too long\n");
return false;
}
/* create the nics */
if (instantiate_veth(veth1buf, &veth2buf) < 0) {
fprintf(stderr, "Error creating veth tunnel\n");
return false;
}
if (strcmp(br, "none") != 0) {
/* copy the bridge's mtu to both ends */
mtu = get_mtu(br);
if (mtu != -1) {
if (lxc_netdev_set_mtu(veth1buf, mtu) < 0 ||
lxc_netdev_set_mtu(veth2buf, mtu) < 0) {
fprintf(stderr, "Failed setting mtu\n");
goto out_del;
}
}
/* attach veth1 to bridge */
if (lxc_bridge_attach(lxcpath, lxcname, br, veth1buf) < 0) {
fprintf(stderr, "Error attaching %s to %s\n", veth1buf, br);
goto out_del;
}
}
/* pass veth2 to target netns */
ret = lxc_netdev_move_by_name(veth2buf, pid, NULL);
if (ret < 0) {
fprintf(stderr, "Error moving %s to netns %d\n", veth2buf, pid);
goto out_del;
}
*cnic = strdup(veth2buf);
return true;
out_del:
lxc_netdev_delete_by_name(veth1buf);
return false;
}
static int create_nic(char *nic, char *br, int pid, char **cnic)
{
char veth1buf[IFNAMSIZ], veth2buf[IFNAMSIZ];
int mtu, ret;
ret = snprintf(veth1buf, IFNAMSIZ, "%s", nic);
if (ret < 0 || ret >= IFNAMSIZ) {
usernic_error("%s", "Could not create nic name\n");
return -1;
}
ret = snprintf(veth2buf, IFNAMSIZ, "%sp", veth1buf);
if (ret < 0 || ret >= IFNAMSIZ) {
usernic_error("%s\n", "Could not create nic name");
return -1;
}
/* create the nics */
ret = instantiate_veth(veth1buf, veth2buf);
if (ret < 0) {
usernic_error("%s", "Error creating veth tunnel\n");
return -1;
}
if (strcmp(br, "none")) {
/* copy the bridge's mtu to both ends */
mtu = get_mtu(br);
if (mtu > 0) {
ret = lxc_netdev_set_mtu(veth1buf, mtu);
if (ret < 0) {
usernic_error("Failed to set mtu to %d on %s\n",
mtu, veth1buf);
goto out_del;
}
ret = lxc_netdev_set_mtu(veth2buf, mtu);
if (ret < 0) {
usernic_error("Failed to set mtu to %d on %s\n",
mtu, veth2buf);
goto out_del;
}
}
/* attach veth1 to bridge */
ret = lxc_bridge_attach(br, veth1buf);
if (ret < 0) {
usernic_error("Error attaching %s to %s\n", veth1buf, br);
goto out_del;
}
}
/* pass veth2 to target netns */
ret = lxc_netdev_move_by_name(veth2buf, pid, NULL);
if (ret < 0) {
usernic_error("Error moving %s to network namespace of %d\n",
veth2buf, pid);
goto out_del;
}
*cnic = strdup(veth2buf);
if (!*cnic) {
usernic_error("Failed to copy string \"%s\"\n", veth2buf);
return -1;
}
return 0;
out_del:
lxc_netdev_delete_by_name(veth1buf);
return -1;
}
