From 4bc8fbc95e0d831e5e3800ecc8a8d5acac79c9a8 Mon Sep 17 00:00:00 2001 From: Alexander Aring Date: Wed, 30 Sep 2015 10:20:10 +0200 Subject: [PATCH] ieee802154: 6lowpan: don't skip first dsn while fragmentation This patch fixes the data frame sequence numer (dsn) while 6lowpan fragmentation for frag1. Currently we create one 802.15.4 header at first, then check if it's match into one frame and at the end construct many fragments and calling wpan_dev_hard_header for each of them, inclusive for the first fragment. This will make the first generated header to garbage, instead we copying this header for frag1 instead of generate a new one which skips one dsn. Signed-off-by: Alexander Aring Signed-off-by: Marcel Holtmann --- net/ieee802154/6lowpan/tx.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c index 5ecf8af7154b..3b665e12cf2b 100644 --- a/net/ieee802154/6lowpan/tx.c +++ b/net/ieee802154/6lowpan/tx.c @@ -79,7 +79,7 @@ int lowpan_header_create(struct sk_buff *skb, struct net_device *ldev, static struct sk_buff* lowpan_alloc_frag(struct sk_buff *skb, int size, - const struct ieee802154_hdr *master_hdr) + const struct ieee802154_hdr *master_hdr, bool frag1) { struct net_device *wdev = lowpan_dev_info(skb->dev)->wdev; struct sk_buff *frag; @@ -95,11 +95,17 @@ lowpan_alloc_frag(struct sk_buff *skb, int size, skb_reset_network_header(frag); *mac_cb(frag) = *mac_cb(skb); - rc = wpan_dev_hard_header(frag, wdev, &master_hdr->dest, - &master_hdr->source, size); - if (rc < 0) { - kfree_skb(frag); - return ERR_PTR(rc); + if (frag1) { + memcpy(skb_put(frag, skb->mac_len), + skb_mac_header(skb), skb->mac_len); + } else { + rc = wpan_dev_hard_header(frag, wdev, + &master_hdr->dest, + &master_hdr->source, size); + if (rc < 0) { + kfree_skb(frag); + return ERR_PTR(rc); + } } } else { frag = ERR_PTR(-ENOMEM); @@ -111,13 +117,13 @@ lowpan_alloc_frag(struct sk_buff *skb, int size, static int lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, u8 *frag_hdr, int frag_hdrlen, - int offset, int len) + int offset, int len, bool frag1) { struct sk_buff *frag; raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen); - frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr); + frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr, frag1); if (IS_ERR(frag)) return PTR_ERR(frag); @@ -156,7 +162,8 @@ lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev, rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, LOWPAN_FRAG1_HEAD_SIZE, 0, - frag_len + skb_network_header_len(skb)); + frag_len + skb_network_header_len(skb), + true); if (rc) { pr_debug("%s unable to send FRAG1 packet (tag: %d)", __func__, ntohs(frag_tag)); @@ -177,7 +184,7 @@ lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev, rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, LOWPAN_FRAGN_HEAD_SIZE, skb_offset, - frag_len); + frag_len, false); if (rc) { pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n", __func__, ntohs(frag_tag), skb_offset); -- 2.20.1