6lowpan: add udp warning for elided checksum
Bit 5 of "UDP LOWPAN_NHC Format" indicate that the checksum can be elided. The host need to calculate the udp checksum afterwards but this isn't supported right now. See: http://tools.ietf.org/html/rfc6282#section-4.3.3 Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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@ -231,6 +231,7 @@
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#define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline,
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dest = 16 bit inline */
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#define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */
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#define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */
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#ifdef DEBUG
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/* print data in line */
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@ -309,9 +309,14 @@ uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh)
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pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
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ntohs(uh->source), ntohs(uh->dest));
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/* copy checksum */
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memcpy(&uh->check, &skb->data[0], 2);
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skb_pull(skb, 2);
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/* checksum */
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if (tmp & LOWPAN_NHC_UDP_CS_C) {
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pr_debug_ratelimited("checksum elided currently not supported\n");
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goto err;
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} else {
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memcpy(&uh->check, &skb->data[0], 2);
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skb_pull(skb, 2);
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}
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/*
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* UDP lenght needs to be infered from the lower layers
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