From 980edbd503dc0823c75e138edc53a48f99e1e3f6 Mon Sep 17 00:00:00 2001 From: Simon Vincent Date: Tue, 4 Nov 2014 15:29:51 +0000 Subject: [PATCH] 6lowpan: fix udp header compression when using raw sockets 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 Acked-by: Alexander Aring Signed-off-by: Marcel Holtmann --- net/6lowpan/iphc.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c index 73a7065f0c6b..cd5f8b8e34cd 100644 --- a/net/6lowpan/iphc.c +++ b/net/6lowpan/iphc.c @@ -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) == -- 2.20.1