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authorAlexander Aring <aar@pengutronix.de>2016-03-16 13:52:41 +0100
committerMarcel Holtmann <marcel@holtmann.org>2016-04-08 19:28:13 +0200
commitfeb2add3235ca81dc5cd5d975490c707a24c9889 (patch)
tree403717eb115afc4ce01d1d6c0889ce3b2d683871 /net/6lowpan
parent13407376b255325fa817798800117a839f3aa055 (diff)
downloadlinux-stericsson-feb2add3235ca81dc5cd5d975490c707a24c9889.tar.gz
6lowpan: iphc: fix handling of link-local compression
This patch fixes handling in case of link-local address compression. A IPv6 link-local address is defined as fe80::/10 prefix which is also what ipv6_addr_type checks for link-local addresses. But IPHC compression for link-local addresses are for fe80::/64 types only. This patch adds additional checks for zero padded bits in case of link-local address compression to match on a fe80::/64 address only. Signed-off-by: Alexander Aring <aar@pengutronix.de> Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/6lowpan')
-rw-r--r--net/6lowpan/iphc.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index 99bb22aea346..68c80f3c9add 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -148,6 +148,11 @@
(((a)->s6_addr16[6]) == 0) && \
(((a)->s6_addr[14]) == 0))
+#define lowpan_is_linklocal_zero_padded(a) \
+ (!(hdr->saddr.s6_addr[1] & 0x3f) && \
+ !hdr->saddr.s6_addr16[1] && \
+ !hdr->saddr.s6_addr32[1])
+
#define LOWPAN_IPHC_CID_DCI(cid) (cid & 0x0f)
#define LOWPAN_IPHC_CID_SCI(cid) ((cid & 0xf0) >> 4)
@@ -1101,7 +1106,8 @@ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
true);
iphc1 |= LOWPAN_IPHC_SAC;
} else {
- if (ipv6_saddr_type & IPV6_ADDR_LINKLOCAL) {
+ if (ipv6_saddr_type & IPV6_ADDR_LINKLOCAL &&
+ lowpan_is_linklocal_zero_padded(hdr->saddr)) {
iphc1 |= lowpan_compress_addr_64(&hc_ptr,
&hdr->saddr,
saddr, true);
@@ -1135,7 +1141,8 @@ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
false);
iphc1 |= LOWPAN_IPHC_DAC;
} else {
- if (ipv6_daddr_type & IPV6_ADDR_LINKLOCAL) {
+ if (ipv6_daddr_type & IPV6_ADDR_LINKLOCAL &&
+ lowpan_is_linklocal_zero_padded(hdr->daddr)) {
iphc1 |= lowpan_compress_addr_64(&hc_ptr,
&hdr->daddr,
daddr, false);