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Commit 607b0bd3 authored by Alexander Aring's avatar Alexander Aring Committed by Marcel Holtmann
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6lowpan: nhc: move iphc manipulation out of nhc 



This patch moves the iphc setting of next header commpression bit inside
iphc functionality. Setting of IPHC bits should be happen at iphc.c file
only.

Signed-off-by: default avatarAlexander Aring <alex.aring@gmail.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 478208e3

net/6lowpan/iphc.c

+6 −3
Original line number Diff line number Diff line
@@ -532,9 +532,12 @@ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev, 
	/* Check if we provide the nhc format for nexthdr and compression

	 * functionality. If not nexthdr is handled inline and not compressed.

	 */

	ret = lowpan_nhc_check_compression(skb, hdr, &hc_ptr, &iphc0);

	if (ret < 0)

		return ret;

	ret = lowpan_nhc_check_compression(skb, hdr, &hc_ptr);

	if (ret == -ENOENT)

		lowpan_push_hc_data(&hc_ptr, &hdr->nexthdr,

				    sizeof(hdr->nexthdr));

	else

		iphc0 |= LOWPAN_IPHC_NH_C;



	/* Hop limit

	 * if 1:   compress, encoding is 01

net/6lowpan/nhc.c

+5 −8
Original line number Diff line number Diff line
@@ -95,23 +95,20 @@ static struct lowpan_nhc *lowpan_nhc_by_nhcid(const struct sk_buff *skb) 
}



int lowpan_nhc_check_compression(struct sk_buff *skb,

				 const struct ipv6hdr *hdr, u8 **hc_ptr,

				 u8 *iphc0)

				 const struct ipv6hdr *hdr, u8 **hc_ptr)

{

	struct lowpan_nhc *nhc;

	int ret = 0;



	spin_lock_bh(&lowpan_nhc_lock);



	nhc = lowpan_nexthdr_nhcs[hdr->nexthdr];

	if (nhc && nhc->compress)

		*iphc0 |= LOWPAN_IPHC_NH_C;

	else

		lowpan_push_hc_data(hc_ptr, &hdr->nexthdr,

				    sizeof(hdr->nexthdr));

	if (!(nhc && nhc->compress))

		ret = -ENOENT;



	spin_unlock_bh(&lowpan_nhc_lock);



	return 0;

	return ret;

}



int lowpan_nhc_do_compression(struct sk_buff *skb, const struct ipv6hdr *hdr,

net/6lowpan/nhc.h

+3 −6
Original line number Diff line number Diff line
@@ -86,19 +86,16 @@ struct lowpan_nhc *lowpan_nhc_by_nexthdr(u8 nexthdr); 


/**

 * lowpan_nhc_check_compression - checks if we support compression format. If

 *	we support the nhc by nexthdr field, the 6LoWPAN iphc NHC bit will be

 *	set. If we don't support nexthdr will be added as inline data to the

 *	6LoWPAN header.

 *	we support the nhc by nexthdr field, the function will return 0. If we

 *	don't support the nhc by nexthdr this function will return -ENOENT.

 *

 * @skb: skb of 6LoWPAN header to read nhc and replace header.

 * @hdr: ipv6hdr to check the nexthdr value

 * @hc_ptr: pointer for 6LoWPAN header which should increment at the end of

 *	    replaced header.

 * @iphc0: iphc0 pointer to set the 6LoWPAN NHC bit

 */

int lowpan_nhc_check_compression(struct sk_buff *skb,

				 const struct ipv6hdr *hdr, u8 **hc_ptr,

				 u8 *iphc0);

				 const struct ipv6hdr *hdr, u8 **hc_ptr);



/**

 * lowpan_nhc_do_compression - calling compress callback for nhc