Add pr_debug() call in order to debug 6LoWPAN fragmentation and
reassembly.
Signed-off-by: Tony Cheneau <tony.chen...@amnesiak.org>
---
net/ieee802154/6lowpan.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 4a62289..61eee9d 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -742,10 +742,16 @@ lowpan_process_data(struct sk_buff *skb)
/* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
len = ((iphc0 & 7) << 8) | slen;
- /* FRAGN */
- if ((iphc0 & LOWPAN_DISPATCH_MASK) != LOWPAN_DISPATCH_FRAG1) {
+ if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) {
+ pr_debug("%s received a FRAG1 packet (tag: %d, "
+ "size of the entire IP packet: %d)",
+ __func__, tag, len);
+ } else { /* FRAGN */
if (lowpan_fetch_skb_u8(skb, &offset))
goto unlock_and_drop;
+ pr_debug("%s received a FRAGN packet (tag: %d, "
+ "size of the entire IP packet: %d, "
+ "offset: %d)", __func__, tag, len, offset * 8);
}
/*
@@ -762,6 +768,8 @@ lowpan_process_data(struct sk_buff *skb)
/* alloc new frame structure */
if (!found) {
+ pr_debug("%s first fragment received for tag %d, "
+ "begin packet reassembly", __func__, tag);
frame = lowpan_alloc_new_frame(skb, len, tag);
if (!frame)
goto unlock_and_drop;
@@ -784,6 +792,9 @@ lowpan_process_data(struct sk_buff *skb)
list_del(&frame->list);
spin_unlock_bh(&flist_lock);
+ pr_debug("%s successfully reassembled fragment "
+ "(tag %d)", __func__, tag);
+
dev_kfree_skb(skb);
skb = frame->skb;
kfree(frame);
@@ -1034,8 +1045,11 @@ lowpan_skb_fragmentation(struct sk_buff *skb)
err = lowpan_fragment_xmit(skb, head, header_length, LOWPAN_FRAG_SIZE,
0, LOWPAN_DISPATCH_FRAG1);
- if (err)
+ if (err) {
+ pr_debug("%s unable to send FRAG1 packet (tag: %d)",
+ __func__, tag);
goto exit;
+ }
offset = LOWPAN_FRAG_SIZE;
@@ -1053,8 +1067,11 @@ lowpan_skb_fragmentation(struct sk_buff *skb)
err = lowpan_fragment_xmit(skb, head, header_length,
len, offset, LOWPAN_DISPATCH_FRAGN);
- if (err)
+ if (err) {
+ pr_debug("%s unable to send a subsequent FRAGN packet "
+ "(tag: %d, offset: %d", __func__, tag, offset);
goto exit;
+ }
offset += len;
}
--
1.7.12.4
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