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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2017-03-12 10:19:37 +0200
committerMarcel Holtmann <marcel@holtmann.org>2017-04-12 22:02:36 +0200
commitfa09ae661fb5ab6f9826545d5128f2b7393bcf4a (patch)
tree3e97a905cfc5182279062b77b3be654db917876a /net/6lowpan
parent8a7a4b476719df1e06f8eae837b13bdf79908843 (diff)
downloadlinux-stericsson-fa09ae661fb5ab6f9826545d5128f2b7393bcf4a.tar.gz
6lowpan: Use netdev addr_len to determine lladdr len
This allow technologies such as Bluetooth to use its native lladdr which is eui48 instead of eui64 which was expected by functions like lowpan_header_decompress and lowpan_header_compress. Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@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.c49
1 files changed, 38 insertions, 11 deletions
diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index fb5f6fa8f1df..6b1042e21656 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -278,6 +278,23 @@ lowpan_iphc_ctx_get_by_mcast_addr(const struct net_device *dev,
return ret;
}
+static void lowpan_iphc_uncompress_lladdr(const struct net_device *dev,
+ struct in6_addr *ipaddr,
+ const void *lladdr)
+{
+ switch (dev->addr_len) {
+ case ETH_ALEN:
+ lowpan_iphc_uncompress_eui48_lladdr(ipaddr, lladdr);
+ break;
+ case EUI64_ADDR_LEN:
+ lowpan_iphc_uncompress_eui64_lladdr(ipaddr, lladdr);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+}
+
/* Uncompress address function for source and
* destination address(non-multicast).
*
@@ -320,7 +337,7 @@ static int lowpan_iphc_uncompress_addr(struct sk_buff *skb,
lowpan_iphc_uncompress_802154_lladdr(ipaddr, lladdr);
break;
default:
- lowpan_iphc_uncompress_eui64_lladdr(ipaddr, lladdr);
+ lowpan_iphc_uncompress_lladdr(dev, ipaddr, lladdr);
break;
}
break;
@@ -381,7 +398,7 @@ static int lowpan_iphc_uncompress_ctx_addr(struct sk_buff *skb,
lowpan_iphc_uncompress_802154_lladdr(ipaddr, lladdr);
break;
default:
- lowpan_iphc_uncompress_eui64_lladdr(ipaddr, lladdr);
+ lowpan_iphc_uncompress_lladdr(dev, ipaddr, lladdr);
break;
}
ipv6_addr_prefix_copy(ipaddr, &ctx->pfx, ctx->plen);
@@ -810,6 +827,21 @@ lowpan_iphc_compress_ctx_802154_lladdr(const struct in6_addr *ipaddr,
return lladdr_compress;
}
+static bool lowpan_iphc_addr_equal(const struct net_device *dev,
+ const struct lowpan_iphc_ctx *ctx,
+ const struct in6_addr *ipaddr,
+ const void *lladdr)
+{
+ struct in6_addr tmp = {};
+
+ lowpan_iphc_uncompress_lladdr(dev, &tmp, lladdr);
+
+ if (ctx)
+ ipv6_addr_prefix_copy(&tmp, &ctx->pfx, ctx->plen);
+
+ return ipv6_addr_equal(&tmp, ipaddr);
+}
+
static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct net_device *dev,
const struct in6_addr *ipaddr,
const struct lowpan_iphc_ctx *ctx,
@@ -827,13 +859,7 @@ static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct net_device *dev,
}
break;
default:
- /* check for SAM/DAM = 11 */
- memcpy(&tmp.s6_addr[8], lladdr, EUI64_ADDR_LEN);
- /* second bit-flip (Universe/Local) is done according RFC2464 */
- tmp.s6_addr[8] ^= 0x02;
- /* context information are always used */
- ipv6_addr_prefix_copy(&tmp, &ctx->pfx, ctx->plen);
- if (ipv6_addr_equal(&tmp, ipaddr)) {
+ if (lowpan_iphc_addr_equal(dev, ctx, ipaddr, lladdr)) {
dam = LOWPAN_IPHC_DAM_11;
goto out;
}
@@ -929,11 +955,12 @@ static u8 lowpan_compress_addr_64(u8 **hc_ptr, const struct net_device *dev,
}
break;
default:
- if (is_addr_mac_addr_based(ipaddr, lladdr)) {
- dam = LOWPAN_IPHC_DAM_11; /* 0-bits */
+ if (lowpan_iphc_addr_equal(dev, NULL, ipaddr, lladdr)) {
+ dam = LOWPAN_IPHC_DAM_11;
pr_debug("address compression 0 bits\n");
goto out;
}
+
break;
}