diff options
| author | Alexander Aring <alex.aring@gmail.com> | 2013-12-17 14:21:25 +0100 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2013-12-17 15:16:48 +0100 |
| commit | 573701ce3715434f01a8baea3255da8d04ad5979 (patch) | |
| tree | 65925d37c0b3a48f0918e66716db81f364549834 | |
| parent | 6lowpan: fix udp byte ordering (diff) | |
| download | linux-573701ce3715434f01a8baea3255da8d04ad5979.tar.xz linux-573701ce3715434f01a8baea3255da8d04ad5979.zip | |
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>
| -rw-r--r-- | net/ieee802154/6lowpan.h | 1 | ||||
| -rw-r--r-- | net/ieee802154/6lowpan_iphc.c | 11 |
2 files changed, 9 insertions, 3 deletions
diff --git a/net/ieee802154/6lowpan.h b/net/ieee802154/6lowpan.h index 4981bf859e5b..2b835db3bda8 100644 --- a/net/ieee802154/6lowpan.h +++ b/net/ieee802154/6lowpan.h @@ -231,6 +231,7 @@ #define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline, dest = 16 bit inline */ #define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */ +#define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */ #ifdef DEBUG /* print data in line */ diff --git a/net/ieee802154/6lowpan_iphc.c b/net/ieee802154/6lowpan_iphc.c index 02bf74d80e72..a70fa66b5357 100644 --- a/net/ieee802154/6lowpan_iphc.c +++ b/net/ieee802154/6lowpan_iphc.c @@ -309,9 +309,14 @@ uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) pr_debug("uncompressed UDP ports: src = %d, dst = %d\n", ntohs(uh->source), ntohs(uh->dest)); - /* copy checksum */ - memcpy(&uh->check, &skb->data[0], 2); - skb_pull(skb, 2); + /* checksum */ + if (tmp & LOWPAN_NHC_UDP_CS_C) { + pr_debug_ratelimited("checksum elided currently not supported\n"); + goto err; + } else { + memcpy(&uh->check, &skb->data[0], 2); + skb_pull(skb, 2); + } /* * UDP lenght needs to be infered from the lower layers |