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+From: Matthias Schiffer <mschiffer@universe-factory.net>
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+Date: Thu, 9 Mar 2017 19:00:12 +0100
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+Subject: batman-adv: backport a few maint patches
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+
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+In particular, this fixes packages of a certain range of sizes not being
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+transmitted correctly, leading to hanging TCP connections.
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+
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+diff --git a/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch b/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch
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+new file mode 100644
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+index 0000000000000000000000000000000000000000..4d754ecda1451b5c3e25f74da97fab18b7a93c87
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+--- /dev/null
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++++ b/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch
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+@@ -0,0 +1,64 @@
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++From bcb7b6149bd9d1f41dae01ab47e74b8a931a650f Mon Sep 17 00:00:00 2001
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++Message-Id: <bcb7b6149bd9d1f41dae01ab47e74b8a931a650f.1489082249.git.mschiffer@universe-factory.net>
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++From: Sven Eckelmann <sven@narfation.org>
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++Date: Sun, 12 Feb 2017 11:26:33 +0100
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++Subject: [PATCH] batman-adv: Fix double free during fragment merge error
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++
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++The function batadv_frag_skb_buffer was supposed not to consume the skbuff
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++on errors. This was followed in the helper function
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++batadv_frag_insert_packet when the skb would potentially be inserted in the
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++fragment queue. But it could happen that the next helper function
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++batadv_frag_merge_packets would try to merge the fragments and fail. This
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++results in a kfree_skb of all the enqueued fragments (including the just
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++inserted one). batadv_recv_frag_packet would detect the error in
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++batadv_frag_skb_buffer and try to free the skb again.
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++
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++The behavior of batadv_frag_skb_buffer (and its helper
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++batadv_frag_insert_packet) must therefore be changed to always consume the
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++skbuff to have a common behavior and avoid the double kfree_skb.
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++
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++Fixes: 9b3eab61754d ("batman-adv: Receive fragmented packets and merge")
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++Signed-off-by: Sven Eckelmann <sven@narfation.org>
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++---
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++ net/batman-adv/fragmentation.c | 8 +++++---
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++ 1 file changed, 5 insertions(+), 3 deletions(-)
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++
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++diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
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++index 65536db1..c3e293a3 100644
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++--- a/net/batman-adv/fragmentation.c
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+++++ b/net/batman-adv/fragmentation.c
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++@@ -233,8 +233,10 @@ err_unlock:
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++ spin_unlock_bh(&chain->lock);
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++
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++ err:
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++- if (!ret)
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+++ if (!ret) {
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++ kfree(frag_entry_new);
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+++ kfree_skb(skb);
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+++ }
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++
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++ return ret;
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++ }
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++@@ -305,7 +307,7 @@ free:
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++ *
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++ * There are three possible outcomes: 1) Packet is merged: Return true and
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++ * set *skb to merged packet; 2) Packet is buffered: Return true and set *skb
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++- * to NULL; 3) Error: Return false and leave skb as is.
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+++ * to NULL; 3) Error: Return false and free skb.
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++ *
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++ * Return: true when packet is merged or buffered, false when skb is not not
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++ * used.
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++@@ -330,9 +332,9 @@ bool batadv_frag_skb_buffer(struct sk_buff **skb,
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++ goto out_err;
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++
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++ out:
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++- *skb = skb_out;
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++ ret = true;
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++ out_err:
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+++ *skb = skb_out;
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++ return ret;
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++ }
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++
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++--
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++2.12.0
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++
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+diff --git a/batman-adv/patches/1004-batman-adv-Keep-fragments-equally-sized.patch b/batman-adv/patches/1004-batman-adv-Keep-fragments-equally-sized.patch
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+new file mode 100644
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+index 0000000000000000000000000000000000000000..431c0b4a1a722c4c2ebae390bc0c90be18966023
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+--- /dev/null
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++++ b/batman-adv/patches/1004-batman-adv-Keep-fragments-equally-sized.patch
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+@@ -0,0 +1,112 @@
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++From 450247570eacc8b6cf5484fe61c50eff804c6416 Mon Sep 17 00:00:00 2001
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++Message-Id: <450247570eacc8b6cf5484fe61c50eff804c6416.1489082253.git.mschiffer@universe-factory.net>
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++From: Sven Eckelmann <sven@narfation.org>
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++Date: Sat, 4 Mar 2017 17:29:25 +0100
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++Subject: [PATCH] batman-adv: Keep fragments equally sized
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++MIME-Version: 1.0
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++Content-Type: text/plain; charset=UTF-8
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++Content-Transfer-Encoding: 8bit
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++
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++The batman-adv fragmentation packets have the design problem that they
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++cannot be refragmented and cannot handle padding by the underlying link.
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++The latter often leads to problems when networks are incorrectly configured
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++and don't use a common MTU.
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++
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++The sender could for example fragment a 1271 byte frame (plus external
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++ethernet header (14) and batadv unicast header (10)) to fit in a 1280 bytes
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++large MTU of the underlying link (max. 1294 byte frames). This would create
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++a 1294 bytes large frame (fragment 2) and a 55 bytes large frame
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++(fragment 1). The extra 54 bytes are the fragment header (20) added to each
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++fragment and the external ethernet header (14) for the second fragment.
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++
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++Let us assume that the next hop is then not able to transport 1294 bytes to
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++its next hop. The 1294 byte large frame will be dropped but the 55 bytes
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++large fragment will still be forwarded to its destination.
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++
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++Or let us assume that the underlying hardware requires that each frame has
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++a minimum size (e.g. 60 bytes). Then it will pad the 55 bytes frame to 60
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++bytes. The receiver of the 60 bytes frame will no longer be able to
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++correctly assemble the two frames together because it is not aware that 5
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++bytes of the 60 bytes frame are padding and don't belong to the reassembled
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++frame.
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++
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++This can partly be avoided by splitting frames more equally. In this
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++example, the 675 and 674 bytes large fragment frames could both potentially
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++reach its destination without being too large or too small.
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++
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++Reported-by: Martin Weinelt <martin@darmstadt.freifunk.net>
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++Fixes: db56e4ecf5c2 ("batman-adv: Fragment and send skbs larger than mtu")
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++Signed-off-by: Sven Eckelmann <sven@narfation.org>
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++Acked-by: Linus Lüssing <linus.luessing@c0d3.blue>
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++Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
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++---
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++ net/batman-adv/fragmentation.c | 20 +++++++++++++-------
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++ 1 file changed, 13 insertions(+), 7 deletions(-)
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++
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++diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
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++index c3e293a3..89882ed7 100644
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++--- a/net/batman-adv/fragmentation.c
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+++++ b/net/batman-adv/fragmentation.c
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++@@ -396,7 +396,7 @@ out:
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++ * batadv_frag_create - create a fragment from skb
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++ * @skb: skb to create fragment from
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++ * @frag_head: header to use in new fragment
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++- * @mtu: size of new fragment
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+++ * @fragment_size: size of new fragment
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++ *
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++ * Split the passed skb into two fragments: A new one with size matching the
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++ * passed mtu and the old one with the rest. The new skb contains data from the
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++@@ -406,11 +406,11 @@ out:
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++ */
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++ static struct sk_buff *batadv_frag_create(struct sk_buff *skb,
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++ struct batadv_frag_packet *frag_head,
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++- unsigned int mtu)
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+++ unsigned int fragment_size)
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++ {
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++ struct sk_buff *skb_fragment;
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++ unsigned int header_size = sizeof(*frag_head);
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++- unsigned int fragment_size = mtu - header_size;
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+++ unsigned int mtu = fragment_size + header_size;
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++
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++ skb_fragment = netdev_alloc_skb(NULL, mtu + ETH_HLEN);
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++ if (!skb_fragment)
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++@@ -448,7 +448,7 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
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++ struct sk_buff *skb_fragment;
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++ unsigned int mtu = neigh_node->if_incoming->net_dev->mtu;
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++ unsigned int header_size = sizeof(frag_header);
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++- unsigned int max_fragment_size, max_packet_size;
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+++ unsigned int max_fragment_size, num_fragments;
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++ bool ret = false;
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++
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++ /* To avoid merge and refragmentation at next-hops we never send
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++@@ -456,10 +456,15 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
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++ */
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++ mtu = min_t(unsigned int, mtu, BATADV_FRAG_MAX_FRAG_SIZE);
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++ max_fragment_size = mtu - header_size;
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++- max_packet_size = max_fragment_size * BATADV_FRAG_MAX_FRAGMENTS;
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+++
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+++ if (skb->len == 0 || max_fragment_size == 0)
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+++ return -EINVAL;
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+++
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+++ num_fragments = (skb->len - 1) / max_fragment_size + 1;
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+++ max_fragment_size = (skb->len - 1) / num_fragments + 1;
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++
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++ /* Don't even try to fragment, if we need more than 16 fragments */
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++- if (skb->len > max_packet_size)
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+++ if (num_fragments > BATADV_FRAG_MAX_FRAGMENTS)
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++ goto out_err;
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++
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++ bat_priv = orig_node->bat_priv;
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++@@ -480,7 +485,8 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
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++
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++ /* Eat and send fragments from the tail of skb */
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++ while (skb->len > max_fragment_size) {
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++- skb_fragment = batadv_frag_create(skb, &frag_header, mtu);
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+++ skb_fragment = batadv_frag_create(skb, &frag_header,
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+++ max_fragment_size);
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++ if (!skb_fragment)
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++ goto out_err;
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++
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++--
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++2.12.0
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++
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