6lowpan: iphc: use ipv6 api to check address scope

This patch removes the own implementation to check of link-layer,
broadcast and any address type and use the IPv6 api for that.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 17 insertions, 25 deletions

diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h
index 79b530fb2c4d..18010bce68c8 100644
--- a/include/net/6lowpan.h
+++ b/include/net/6lowpan.h
@@ -75,20 +75,10 @@
          (((a)->s6_addr[14]) == (m)[6]) &&              \
          (((a)->s6_addr[15]) == (m)[7]))
 
-/* ipv6 address is unspecified */
-#define is_addr_unspecified(a)          \
-        ((((a)->s6_addr32[0]) == 0) &&  \
-         (((a)->s6_addr32[1]) == 0) &&  \
-         (((a)->s6_addr32[2]) == 0) &&  \
-         (((a)->s6_addr32[3]) == 0))
-
 /* compare ipv6 addresses prefixes */
 #define ipaddr_prefixcmp(addr1, addr2, length) \
         (memcmp(addr1, addr2, length >> 3) == 0)
 
-/* local link, i.e. FE80::/10 */
-#define is_addr_link_local(a) (((a)->s6_addr16[0]) == htons(0xFE80))
-
 /*
  * check whether we can compress the IID to 16 bits,
  * it's possible for unicast adresses with first 49 bits are zero only.
@@ -100,9 +90,6 @@
          (((a)->s6_addr[12]) == 0xfe) &&        \
          (((a)->s6_addr[13]) == 0))
 
-/* multicast address */
-#define is_addr_mcast(a) (((a)->s6_addr[0]) == 0xFF)
-
 /* check whether the 112-bit gid of the multicast address is mappable to: */
 
 /* 9 bits, for FF02::1 (all nodes) and FF02::2 (all routers) addresses only. */
diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index 636edd0f3724..d4fc2dd8ad75 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -611,6 +611,7 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
         u8 tmp, iphc0, iphc1, *hc_ptr;
         struct ipv6hdr *hdr;
         u8 head[100] = {};
+        int addr_type;
 
         if (type != ETH_P_IPV6)
                 return -EINVAL;
@@ -720,23 +721,27 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
                                     sizeof(hdr->hop_limit));
         }
 
+        addr_type = ipv6_addr_type(&hdr->saddr);
         /* source address compression */
-        if (is_addr_unspecified(&hdr->saddr)) {
+        if (addr_type == IPV6_ADDR_ANY) {
                 pr_debug("source address is unspecified, setting SAC\n");
                 iphc1 |= LOWPAN_IPHC_SAC;
-        /* TODO: context lookup */
-        } else if (is_addr_link_local(&hdr->saddr)) {
-                iphc1 |= lowpan_compress_addr_64(&hc_ptr,
-                                LOWPAN_IPHC_SAM_BIT, &hdr->saddr, _saddr);
-                pr_debug("source address unicast link-local %pI6c "
-                        "iphc1 0x%02x\n", &hdr->saddr, iphc1);
         } else {
-                pr_debug("send the full source address\n");
-                lowpan_push_hc_data(&hc_ptr, &hdr->saddr.s6_addr[0], 16);
+                if (addr_type & IPV6_ADDR_LINKLOCAL) {
+                        iphc1 |= lowpan_compress_addr_64(&hc_ptr,
+                                                         LOWPAN_IPHC_SAM_BIT,
+                                                         &hdr->saddr, _saddr);
+                        pr_debug("source address unicast link-local %pI6c iphc1 0x%02x\n",
+                                 &hdr->saddr, iphc1);
+                } else {
+                        pr_debug("send the full source address\n");
+                        lowpan_push_hc_data(&hc_ptr, hdr->saddr.s6_addr, 16);
+                }
         }
 
+        addr_type = ipv6_addr_type(&hdr->daddr);
         /* destination address compression */
-        if (is_addr_mcast(&hdr->daddr)) {
+        if (addr_type & IPV6_ADDR_MULTICAST) {
                 pr_debug("destination address is multicast: ");
                 iphc1 |= LOWPAN_IPHC_M;
                 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
@@ -767,8 +772,8 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
                         lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16);
                 }
         } else {
-                /* TODO: context lookup */
-                if (is_addr_link_local(&hdr->daddr)) {
+                if (addr_type & IPV6_ADDR_LINKLOCAL) {
+                        /* TODO: context lookup */
                         iphc1 |= lowpan_compress_addr_64(&hc_ptr,
                                 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr);
                         pr_debug("dest address unicast link-local %pI6c "