#include "translation-table.h"
#include "soft-interface.h"
#include "hard-interface.h"
-#include "vis.h"
#include "gateway_common.h"
+#include "gateway_client.h"
#include "originator.h"
#include "network-coding.h"
-
-#include <linux/if_ether.h>
+#include "fragmentation.h"
static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
ethhdr = eth_hdr(skb);
memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
- ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
+ ethhdr->h_proto = htons(ETH_P_BATMAN);
skb_set_network_header(skb, ETH_HLEN);
- skb->protocol = __constant_htons(ETH_P_BATMAN);
+ skb->protocol = htons(ETH_P_BATMAN);
skb->dev = hard_iface->net_dev;
/* batadv_find_router() increases neigh_nodes refcount if found. */
neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
if (!neigh_node)
- return ret;
+ goto out;
+
+ /* Check if the skb is too large to send in one piece and fragment
+ * it if needed.
+ */
+ if (atomic_read(&bat_priv->fragmentation) &&
+ skb->len > neigh_node->if_incoming->net_dev->mtu) {
+ /* Fragment and send packet. */
+ if (batadv_frag_send_packet(skb, orig_node, neigh_node))
+ ret = NET_XMIT_SUCCESS;
+
+ goto out;
+ }
/* try to network code the packet, if it is received on an interface
* (i.e. being forwarded). If the packet originates from this node or if
ret = NET_XMIT_SUCCESS;
}
- batadv_neigh_node_free_ref(neigh_node);
+out:
+ if (neigh_node)
+ batadv_neigh_node_free_ref(neigh_node);
+
+ return ret;
+}
+
+/**
+ * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
+ * common fields for unicast packets
+ * @skb: the skb carrying the unicast header to initialize
+ * @hdr_size: amount of bytes to push at the beginning of the skb
+ * @orig_node: the destination node
+ *
+ * Returns false if the buffer extension was not possible or true otherwise.
+ */
+static bool
+batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
+ struct batadv_orig_node *orig_node)
+{
+ struct batadv_unicast_packet *unicast_packet;
+ uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
+
+ if (batadv_skb_head_push(skb, hdr_size) < 0)
+ return false;
+
+ unicast_packet = (struct batadv_unicast_packet *)skb->data;
+ unicast_packet->header.version = BATADV_COMPAT_VERSION;
+ /* batman packet type: unicast */
+ unicast_packet->header.packet_type = BATADV_UNICAST;
+ /* set unicast ttl */
+ unicast_packet->header.ttl = BATADV_TTL;
+ /* copy the destination for faster routing */
+ memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
+ /* set the destination tt version number */
+ unicast_packet->ttvn = ttvn;
+
+ return true;
+}
+
+/**
+ * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
+ * @skb: the skb containing the payload to encapsulate
+ * @orig_node: the destination node
+ *
+ * Returns false if the payload could not be encapsulated or true otherwise.
+ */
+static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
+ struct batadv_orig_node *orig_node)
+{
+ size_t uni_size = sizeof(struct batadv_unicast_packet);
+
+ return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
+}
+
+/**
+ * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
+ * unicast 4addr header
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the skb containing the payload to encapsulate
+ * @orig_node: the destination node
+ * @packet_subtype: the unicast 4addr packet subtype to use
+ *
+ * Returns false if the payload could not be encapsulated or true otherwise.
+ */
+bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
+ struct sk_buff *skb,
+ struct batadv_orig_node *orig,
+ int packet_subtype)
+{
+ struct batadv_hard_iface *primary_if;
+ struct batadv_unicast_4addr_packet *uc_4addr_packet;
+ bool ret = false;
+
+ primary_if = batadv_primary_if_get_selected(bat_priv);
+ if (!primary_if)
+ goto out;
+
+ /* Pull the header space and fill the unicast_packet substructure.
+ * We can do that because the first member of the uc_4addr_packet
+ * is of type struct unicast_packet
+ */
+ if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
+ orig))
+ goto out;
+
+ uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
+ uc_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR;
+ memcpy(uc_4addr_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
+ uc_4addr_packet->subtype = packet_subtype;
+ uc_4addr_packet->reserved = 0;
+
+ ret = true;
+out:
+ if (primary_if)
+ batadv_hardif_free_ref(primary_if);
+ return ret;
+}
+
+/**
+ * batadv_send_skb_unicast - encapsulate and send an skb via unicast
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: payload to send
+ * @packet_type: the batman unicast packet type to use
+ * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
+ * 4addr packets)
+ * @orig_node: the originator to send the packet to
+ * @vid: the vid to be used to search the translation table
+ *
+ * Wrap the given skb into a batman-adv unicast or unicast-4addr header
+ * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied
+ * as packet_type. Then send this frame to the given orig_node and release a
+ * reference to this orig_node.
+ *
+ * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
+ */
+static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
+ struct sk_buff *skb, int packet_type,
+ int packet_subtype,
+ struct batadv_orig_node *orig_node,
+ unsigned short vid)
+{
+ struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+ struct batadv_unicast_packet *unicast_packet;
+ int ret = NET_XMIT_DROP;
+
+ if (!orig_node)
+ goto out;
+
+ switch (packet_type) {
+ case BATADV_UNICAST:
+ if (!batadv_send_skb_prepare_unicast(skb, orig_node))
+ goto out;
+ break;
+ case BATADV_UNICAST_4ADDR:
+ if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
+ orig_node,
+ packet_subtype))
+ goto out;
+ break;
+ default:
+ /* this function supports UNICAST and UNICAST_4ADDR only. It
+ * should never be invoked with any other packet type
+ */
+ goto out;
+ }
+
+ unicast_packet = (struct batadv_unicast_packet *)skb->data;
+
+ /* inform the destination node that we are still missing a correct route
+ * for this client. The destination will receive this packet and will
+ * try to reroute it because the ttvn contained in the header is less
+ * than the current one
+ */
+ if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
+ unicast_packet->ttvn = unicast_packet->ttvn - 1;
+ if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
+ ret = NET_XMIT_SUCCESS;
+
+out:
+ if (orig_node)
+ batadv_orig_node_free_ref(orig_node);
+ if (ret == NET_XMIT_DROP)
+ kfree_skb(skb);
return ret;
}
+/**
+ * batadv_send_skb_via_tt_generic - send an skb via TT lookup
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: payload to send
+ * @packet_type: the batman unicast packet type to use
+ * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
+ * 4addr packets)
+ * @vid: the vid to be used to search the translation table
+ *
+ * Look up the recipient node for the destination address in the ethernet
+ * header via the translation table. Wrap the given skb into a batman-adv
+ * unicast or unicast-4addr header depending on whether BATADV_UNICAST or
+ * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame
+ * to the according destination node.
+ *
+ * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
+ */
+int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
+ struct sk_buff *skb, int packet_type,
+ int packet_subtype, unsigned short vid)
+{
+ struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+ struct batadv_orig_node *orig_node;
+
+ orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
+ ethhdr->h_dest, vid);
+ return batadv_send_skb_unicast(bat_priv, skb, packet_type,
+ packet_subtype, orig_node, vid);
+}
+
+/**
+ * batadv_send_skb_via_gw - send an skb via gateway lookup
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: payload to send
+ * @vid: the vid to be used to search the translation table
+ *
+ * Look up the currently selected gateway. Wrap the given skb into a batman-adv
+ * unicast header and send this frame to this gateway node.
+ *
+ * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
+ */
+int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
+ unsigned short vid)
+{
+ struct batadv_orig_node *orig_node;
+
+ orig_node = batadv_gw_get_selected_orig(bat_priv);
+ return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
+ orig_node, vid);
+}
+
void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
{
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
projects / karo-tx-linux.git / blobdiff