6lowpan: fix udp header compression when using raw sockets (980edbd5) · Commits · 戴 / test

If you use RAW sockets the transport header offset is not set by the ipv6 stack so when we get to the udp header compression it does not compress the right part of the packet. This patch adds a check for this scenario and sets the transport header offset. Signed-off-by:

Simon Vincent <simon.vincent@xsilon.com> Acked-by:

Alexander Aring <alex.aring@gmail.com> Signed-off-by:

Marcel Holtmann <marcel@holtmann.org>

net/6lowpan/iphc.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -512,9 +512,17 @@ static u8 lowpan_compress_addr_64(u8 **hc_ptr, u8 shift,

		static void compress_udp_header(u8 *hc_ptr, struct sk_buff skb)
		{
		struct udphdr *uh = udp_hdr(skb);
		struct udphdr *uh;
		u8 tmp;

		/* In the case of RAW sockets the transport header is not set by
		* the ip6 stack so we must set it ourselves
		*/
		if (skb->transport_header == skb->network_header)
		skb_set_transport_header(skb, sizeof(struct ipv6hdr));

		uh = udp_hdr(skb);

		if (((ntohs(uh->source) & LOWPAN_NHC_UDP_4BIT_MASK) ==
		LOWPAN_NHC_UDP_4BIT_PORT) &&
		((ntohs(uh->dest) & LOWPAN_NHC_UDP_4BIT_MASK) ==

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