int fd;
};
+struct patch_state {
+ char *peer;
+};
+
struct netdev_dev_linux {
struct netdev_dev netdev_dev;
union {
struct tap_state tap;
+ struct patch_state patch;
} state;
};
* additional log messages. */
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
+static int if_up(const char *name);
static int destroy_gre(const char *name);
static int netdev_linux_do_ethtool(const char *name, struct ethtool_cmd *,
int cmd, const char *cmd_name);
{
const char *type = netdev_dev_get_type(netdev_dev);
assert(!strcmp(type, "system") || !strcmp(type, "tap")
- || !strcmp(type, "gre"));
+ || !strcmp(type, "gre") || !strcmp(type, "patch"));
return CONTAINER_OF(netdev_dev, struct netdev_dev_linux, netdev_dev);
}
{
const char *type = netdev_get_type(netdev);
assert(!strcmp(type, "system") || !strcmp(type, "tap")
- || !strcmp(type, "gre"));
+ || !strcmp(type, "gre") || !strcmp(type, "patch"));
return CONTAINER_OF(netdev, struct netdev_linux, netdev);
}
return error;
}
+/* A veth may be created using the 'command' "+<name>,<peer>". A veth may
+ * be destroyed by using the 'command' "-<name>", where <name> can be
+ * either side of the device.
+ */
+static int
+modify_veth(const char *format, ...)
+{
+ FILE *veth_file;
+ va_list args;
+ int retval;
+
+ veth_file = fopen("/sys/class/net/veth_pairs", "w");
+ if (!veth_file) {
+ VLOG_WARN_RL(&rl, "could not open veth device. Are you running a "
+ "supported XenServer with the kernel module loaded?");
+ return ENODEV;
+ }
+ setvbuf(veth_file, NULL, _IONBF, 0);
+
+ va_start(args, format);
+ retval = vfprintf(veth_file, format, args);
+ va_end(args);
+
+ fclose(veth_file);
+ if (retval < 0) {
+ VLOG_WARN_RL(&rl, "could not destroy patch: %s", strerror(errno));
+ return errno;
+ }
+
+ return 0;
+}
+
+static int
+create_patch(const char *name, const char *peer)
+{
+ int retval;
+ struct netdev_dev *peer_nd;
+
+
+ /* Only create the veth if the peer didn't already do it. */
+ peer_nd = netdev_dev_from_name(peer);
+ if (peer_nd) {
+ if (!strcmp("patch", netdev_dev_get_type(peer_nd))) {
+ struct netdev_dev_linux *ndl = netdev_dev_linux_cast(peer_nd);
+ if (!strcmp(name, ndl->state.patch.peer)) {
+ return 0;
+ } else {
+ VLOG_WARN_RL(&rl, "peer '%s' already paired with '%s'",
+ peer, ndl->state.patch.peer);
+ return EINVAL;
+ }
+ } else {
+ VLOG_WARN_RL(&rl, "peer '%s' exists and is not a patch", peer);
+ return EINVAL;
+ }
+ }
+
+ retval = modify_veth("+%s,%s", name, peer);
+ if (retval) {
+ return retval;
+ }
+
+ retval = if_up(name);
+ if (retval) {
+ return retval;
+ }
+
+ retval = if_up(peer);
+ if (retval) {
+ return retval;
+ }
+
+ return 0;
+}
+
+static int
+setup_patch(const char *name, const struct shash *args, char **peer_)
+{
+ const char *peer;
+
+ peer = shash_find_data(args, "peer");
+ if (!peer) {
+ VLOG_WARN("patch type requires valid 'peer' argument");
+ return EINVAL;
+ }
+
+ if (shash_count(args) > 1) {
+ VLOG_WARN("patch type takes only a 'peer' argument");
+ return EINVAL;
+ }
+
+ if (strlen(peer) >= IFNAMSIZ) {
+ VLOG_WARN_RL(&rl, "patch 'peer' arg too long");
+ return EINVAL;
+ }
+
+ *peer_ = xstrdup(peer);
+ return create_patch(name, peer);
+}
+
/* Creates the netdev device of 'type' with 'name'. */
static int
netdev_linux_create_system(const char *name, const char *type OVS_UNUSED,
return error;
}
+static int
+netdev_linux_create_patch(const char *name, const char *type OVS_UNUSED,
+ const struct shash *args, struct netdev_dev **netdev_devp)
+{
+ struct netdev_dev_linux *netdev_dev;
+ char *peer = NULL;
+ int error;
+
+ error = setup_patch(name, args, &peer);
+ if (error) {
+ free(peer);
+ return error;
+ }
+
+ netdev_dev = xzalloc(sizeof *netdev_dev);
+ netdev_dev->state.patch.peer = peer;
+ netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_patch_class);
+ *netdev_devp = &netdev_dev->netdev_dev;
+
+ return 0;
+}
+
static int
netdev_linux_reconfigure_gre(struct netdev_dev *netdev_dev_,
const struct shash *args)
}
}
+static void
+destroy_patch(struct netdev_dev_linux *netdev_dev)
+{
+ const char *name = netdev_dev_get_name(&netdev_dev->netdev_dev);
+ struct patch_state *state = &netdev_dev->state.patch;
+
+ /* Only destroy veth if 'peer' doesn't exist as an existing netdev. */
+ if (!netdev_dev_from_name(state->peer)) {
+ modify_veth("-%s", name);
+ }
+ free(state->peer);
+}
+
/* Destroys the netdev device 'netdev_dev_'. */
static void
netdev_linux_destroy(struct netdev_dev *netdev_dev_)
destroy_tap(netdev_dev);
} else if (!strcmp(type, "gre")) {
destroy_gre(netdev_dev_get_name(&netdev_dev->netdev_dev));
+ } else if (!strcmp(type, "patch")) {
+ destroy_patch(netdev_dev);
}
free(netdev_dev_);
netdev_linux_poll_add,
netdev_linux_poll_remove,
};
+
+const struct netdev_class netdev_patch_class = {
+ "patch",
+
+ netdev_linux_init,
+ netdev_linux_run,
+ netdev_linux_wait,
+
+ netdev_linux_create_patch,
+ netdev_linux_destroy,
+ NULL, /* reconfigure */
+
+ netdev_linux_open,
+ netdev_linux_close,
+
+ NULL, /* enumerate */
+
+ netdev_linux_recv,
+ netdev_linux_recv_wait,
+ netdev_linux_drain,
+
+ netdev_linux_send,
+ netdev_linux_send_wait,
+
+ netdev_linux_set_etheraddr,
+ netdev_linux_get_etheraddr,
+ netdev_linux_get_mtu,
+ netdev_linux_get_ifindex,
+ netdev_linux_get_carrier,
+ netdev_linux_get_stats,
+
+ netdev_linux_get_features,
+ netdev_linux_set_advertisements,
+ netdev_linux_get_vlan_vid,
+ netdev_linux_set_policing,
+
+ netdev_linux_get_in4,
+ netdev_linux_set_in4,
+ netdev_linux_get_in6,
+ netdev_linux_add_router,
+ netdev_linux_get_next_hop,
+ netdev_linux_arp_lookup,
+
+ netdev_linux_update_flags,
+
+ netdev_linux_poll_add,
+ netdev_linux_poll_remove,
+};
\f
static int
get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
projects / openvswitch / commitdiff