6lowpan: move lowpan frag_info out of 802.15.4 headers

Fragmentation and reassembly information for 6lowpan is independent from
the 802.15.4 stack and used only by the 6lowpan reassembly process. Move
the ieee802154_frag_info struct to a private are, it needn't be in the
802.15.4 skb control block.

Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 9 deletions

diff --git a/net/ieee802154/reassembly.c b/net/ieee802154/reassembly.c
index a2b9e4e533f8..ef2d54372b13 100644
--- a/net/ieee802154/reassembly.c
+++ b/net/ieee802154/reassembly.c
@@ -30,6 +30,17 @@
 
 #include "reassembly.h"
 
+struct lowpan_frag_info {
+        __be16 d_tag;
+        u16 d_size;
+        u8 d_offset;
+};
+
+struct lowpan_frag_info *lowpan_cb(struct sk_buff *skb)
+{
+        return (struct lowpan_frag_info *)skb->cb;
+}
+
 static struct inet_frags lowpan_frags;
 
 static int lowpan_frag_reasm(struct lowpan_frag_queue *fq,
@@ -102,7 +113,7 @@ out:
 }
 
 static inline struct lowpan_frag_queue *
-fq_find(struct net *net, const struct ieee802154_frag_info *frag_info,
+fq_find(struct net *net, const struct lowpan_frag_info *frag_info,
         const struct ieee802154_addr *src,
         const struct ieee802154_addr *dst)
 {
@@ -137,8 +148,8 @@ static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
         if (fq->q.last_in & INET_FRAG_COMPLETE)
                 goto err;
 
-        offset = mac_cb(skb)->frag_info.d_offset << 3;
-        end = mac_cb(skb)->frag_info.d_size;
+        offset = lowpan_cb(skb)->d_offset << 3;
+        end = lowpan_cb(skb)->d_size;
 
         /* Is this the final fragment? */
         if (offset + skb->len == end) {
@@ -164,15 +175,13 @@ static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
          * this fragment, right?
          */
         prev = fq->q.fragments_tail;
-        if (!prev || mac_cb(prev)->frag_info.d_offset <
-                     mac_cb(skb)->frag_info.d_offset) {
+        if (!prev || lowpan_cb(prev)->d_offset < lowpan_cb(skb)->d_offset) {
                 next = NULL;
                 goto found;
         }
         prev = NULL;
         for (next = fq->q.fragments; next != NULL; next = next->next) {
-                if (mac_cb(next)->frag_info.d_offset >=
-                    mac_cb(skb)->frag_info.d_offset)
+                if (lowpan_cb(next)->d_offset >= lowpan_cb(skb)->d_offset)
                         break;  /* bingo! */
                 prev = next;
         }
@@ -319,7 +328,7 @@ out_oom:
 }
 
 static int lowpan_get_frag_info(struct sk_buff *skb, const u8 frag_type,
-                                struct ieee802154_frag_info *frag_info)
+                                struct lowpan_frag_info *frag_info)
 {
         bool fail;
         u8 pattern = 0, low = 0;
@@ -346,7 +355,7 @@ int lowpan_frag_rcv(struct sk_buff *skb, const u8 frag_type)
 {
         struct lowpan_frag_queue *fq;
         struct net *net = dev_net(skb->dev);
-        struct ieee802154_frag_info *frag_info = &mac_cb(skb)->frag_info;
+        struct lowpan_frag_info *frag_info = lowpan_cb(skb);
         struct ieee802154_addr source, dest;
         int err;