From ee75ed88879af88558818a5c6609d85f60ff0df4 Mon Sep 17 00:00:00 2001 From: Martin Hundebøll Date: Thu, 23 May 2013 16:53:03 +0200 Subject: batman-adv: Fragment and send skbs larger than mtu MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Non-broadcast packets larger than MTU are fragmented and sent with an encapsulating header. Up to 16 fragments are supported, which are sent in reverse order on the wire to allow minimal memory copying when creating fragments. Signed-off-by: Martin Hundebøll Signed-off-by: Marek Lindner Signed-off-by: Antonio Quartulli --- net/batman-adv/send.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) (limited to 'net/batman-adv/send.c') diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c index b8356ec067bf..1a1aa59d78ee 100644 --- a/net/batman-adv/send.c +++ b/net/batman-adv/send.c @@ -28,8 +28,7 @@ #include "gateway_client.h" #include "originator.h" #include "network-coding.h" - -#include +#include "fragmentation.h" static void batadv_send_outstanding_bcast_packet(struct work_struct *work); @@ -109,7 +108,19 @@ int batadv_send_skb_to_orig(struct sk_buff *skb, /* 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 @@ -123,7 +134,9 @@ int batadv_send_skb_to_orig(struct sk_buff *skb, ret = NET_XMIT_SUCCESS; } - batadv_neigh_node_free_ref(neigh_node); +out: + if (neigh_node) + batadv_neigh_node_free_ref(neigh_node); return ret; } -- cgit