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authorAlexander Aring <aar@pengutronix.de>2016-06-15 21:20:27 +0200
committerDavid S. Miller <davem@davemloft.net>2016-06-15 20:41:24 -0700
commiteab560e58208730ec47e1e0461b8db1049d5d176 (patch)
treefd09b3276c17b4e3dcc8b81197e6a58b3561cc7b /net/6lowpan
parentcfce94653dad2d0661e1926c028ce63052eb20cd (diff)
downloadlinux-stericsson-eab560e58208730ec47e1e0461b8db1049d5d176.tar.gz
6lowpan: add support for 802.15.4 short addr handling
This patch adds necessary handling for use the short address for 802.15.4 6lowpan. It contains support for IPHC address compression and new matching algorithmn to decide which link layer address will be used for 802.15.4 frame. Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com> Signed-off-by: Alexander Aring <aar@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/6lowpan')
-rw-r--r--net/6lowpan/iphc.c167
1 files changed, 138 insertions, 29 deletions
diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index 8501dd532fe1..79f1fa22509a 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -761,22 +761,75 @@ static const u8 lowpan_iphc_dam_to_sam_value[] = {
[LOWPAN_IPHC_DAM_11] = LOWPAN_IPHC_SAM_11,
};
-static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct in6_addr *ipaddr,
+static inline bool
+lowpan_iphc_compress_ctx_802154_lladdr(const struct in6_addr *ipaddr,
+ const struct lowpan_iphc_ctx *ctx,
+ const void *lladdr)
+{
+ const struct ieee802154_addr *addr = lladdr;
+ unsigned char extended_addr[EUI64_ADDR_LEN];
+ bool lladdr_compress = false;
+ struct in6_addr tmp = {};
+
+ switch (addr->mode) {
+ case IEEE802154_ADDR_LONG:
+ ieee802154_le64_to_be64(&extended_addr, &addr->extended_addr);
+ /* check for SAM/DAM = 11 */
+ memcpy(&tmp.s6_addr[8], &extended_addr, 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))
+ lladdr_compress = true;
+ break;
+ case IEEE802154_ADDR_SHORT:
+ tmp.s6_addr[11] = 0xFF;
+ tmp.s6_addr[12] = 0xFE;
+ ieee802154_le16_to_be16(&tmp.s6_addr16[7],
+ &addr->short_addr);
+ /* context information are always used */
+ ipv6_addr_prefix_copy(&tmp, &ctx->pfx, ctx->plen);
+ if (ipv6_addr_equal(&tmp, ipaddr))
+ lladdr_compress = true;
+ break;
+ default:
+ /* should never handled and filtered by 802154 6lowpan */
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return lladdr_compress;
+}
+
+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,
const unsigned char *lladdr, bool sam)
{
struct in6_addr tmp = {};
u8 dam;
- /* check for SAM/DAM = 11 */
- memcpy(&tmp.s6_addr[8], lladdr, 8);
- /* 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)) {
- dam = LOWPAN_IPHC_DAM_11;
- goto out;
+ switch (lowpan_dev(dev)->lltype) {
+ case LOWPAN_LLTYPE_IEEE802154:
+ if (lowpan_iphc_compress_ctx_802154_lladdr(ipaddr, ctx,
+ lladdr)) {
+ dam = LOWPAN_IPHC_DAM_11;
+ goto out;
+ }
+ 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)) {
+ dam = LOWPAN_IPHC_DAM_11;
+ goto out;
+ }
+ break;
}
memset(&tmp, 0, sizeof(tmp));
@@ -813,28 +866,85 @@ out:
return dam;
}
-static u8 lowpan_compress_addr_64(u8 **hc_ptr, const struct in6_addr *ipaddr,
+static inline bool
+lowpan_iphc_compress_802154_lladdr(const struct in6_addr *ipaddr,
+ const void *lladdr)
+{
+ const struct ieee802154_addr *addr = lladdr;
+ unsigned char extended_addr[EUI64_ADDR_LEN];
+ bool lladdr_compress = false;
+ struct in6_addr tmp = {};
+
+ switch (addr->mode) {
+ case IEEE802154_ADDR_LONG:
+ ieee802154_le64_to_be64(&extended_addr, &addr->extended_addr);
+ if (is_addr_mac_addr_based(ipaddr, extended_addr))
+ lladdr_compress = true;
+ break;
+ case IEEE802154_ADDR_SHORT:
+ /* fe:80::ff:fe00:XXXX
+ * \__/
+ * short_addr
+ *
+ * Universe/Local bit is zero.
+ */
+ tmp.s6_addr[0] = 0xFE;
+ tmp.s6_addr[1] = 0x80;
+ tmp.s6_addr[11] = 0xFF;
+ tmp.s6_addr[12] = 0xFE;
+ ieee802154_le16_to_be16(&tmp.s6_addr16[7],
+ &addr->short_addr);
+ if (ipv6_addr_equal(&tmp, ipaddr))
+ lladdr_compress = true;
+ break;
+ default:
+ /* should never handled and filtered by 802154 6lowpan */
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return lladdr_compress;
+}
+
+static u8 lowpan_compress_addr_64(u8 **hc_ptr, const struct net_device *dev,
+ const struct in6_addr *ipaddr,
const unsigned char *lladdr, bool sam)
{
- u8 dam = LOWPAN_IPHC_DAM_00;
+ u8 dam = LOWPAN_IPHC_DAM_01;
- if (is_addr_mac_addr_based(ipaddr, lladdr)) {
- dam = LOWPAN_IPHC_DAM_11; /* 0-bits */
- pr_debug("address compression 0 bits\n");
- } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
+ switch (lowpan_dev(dev)->lltype) {
+ case LOWPAN_LLTYPE_IEEE802154:
+ if (lowpan_iphc_compress_802154_lladdr(ipaddr, lladdr)) {
+ dam = LOWPAN_IPHC_DAM_11; /* 0-bits */
+ pr_debug("address compression 0 bits\n");
+ goto out;
+ }
+ break;
+ default:
+ if (is_addr_mac_addr_based(ipaddr, lladdr)) {
+ dam = LOWPAN_IPHC_DAM_11; /* 0-bits */
+ pr_debug("address compression 0 bits\n");
+ goto out;
+ }
+ break;
+ }
+
+ if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
/* compress IID to 16 bits xxxx::XXXX */
lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[7], 2);
dam = LOWPAN_IPHC_DAM_10; /* 16-bits */
raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)",
*hc_ptr - 2, 2);
- } else {
- /* do not compress IID => xxxx::IID */
- lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[4], 8);
- dam = LOWPAN_IPHC_DAM_01; /* 64-bits */
- raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)",
- *hc_ptr - 8, 8);
+ goto out;
}
+ /* do not compress IID => xxxx::IID */
+ lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[4], 8);
+ raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)",
+ *hc_ptr - 8, 8);
+
+out:
+
if (sam)
return lowpan_iphc_dam_to_sam_value[dam];
else
@@ -1013,9 +1123,6 @@ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
iphc0 = LOWPAN_DISPATCH_IPHC;
iphc1 = 0;
- raw_dump_inline(__func__, "saddr", saddr, EUI64_ADDR_LEN);
- raw_dump_inline(__func__, "daddr", daddr, EUI64_ADDR_LEN);
-
raw_dump_table(__func__, "sending raw skb network uncompressed packet",
skb->data, skb->len);
@@ -1088,14 +1195,15 @@ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
iphc1 |= LOWPAN_IPHC_SAC;
} else {
if (sci) {
- iphc1 |= lowpan_compress_ctx_addr(&hc_ptr, &hdr->saddr,
+ iphc1 |= lowpan_compress_ctx_addr(&hc_ptr, dev,
+ &hdr->saddr,
&sci_entry, saddr,
true);
iphc1 |= LOWPAN_IPHC_SAC;
} else {
if (ipv6_saddr_type & IPV6_ADDR_LINKLOCAL &&
lowpan_is_linklocal_zero_padded(hdr->saddr)) {
- iphc1 |= lowpan_compress_addr_64(&hc_ptr,
+ iphc1 |= lowpan_compress_addr_64(&hc_ptr, dev,
&hdr->saddr,
saddr, true);
pr_debug("source address unicast link-local %pI6c iphc1 0x%02x\n",
@@ -1123,14 +1231,15 @@ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
}
} else {
if (dci) {
- iphc1 |= lowpan_compress_ctx_addr(&hc_ptr, &hdr->daddr,
+ iphc1 |= lowpan_compress_ctx_addr(&hc_ptr, dev,
+ &hdr->daddr,
&dci_entry, daddr,
false);
iphc1 |= LOWPAN_IPHC_DAC;
} else {
if (ipv6_daddr_type & IPV6_ADDR_LINKLOCAL &&
lowpan_is_linklocal_zero_padded(hdr->daddr)) {
- iphc1 |= lowpan_compress_addr_64(&hc_ptr,
+ iphc1 |= lowpan_compress_addr_64(&hc_ptr, dev,
&hdr->daddr,
daddr, false);
pr_debug("dest address unicast link-local %pI6c iphc1 0x%02x\n",