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authorAlexander Aring <alex.aring@gmail.com>2015-10-20 08:31:26 +0200
committerMarcel Holtmann <marcel@holtmann.org>2015-10-21 00:49:25 +0200
commit09bf420f101c9d35ca0b5f539c7f03951fd2e24d (patch)
tree1a7cc7bd86376d5bdaa2b316d89479c2b2420c04 /net/6lowpan
parentb5af9bdbfe6d497d27e5936a7d110fc5f64e7c0d (diff)
downloadlinux-stericsson-09bf420f101c9d35ca0b5f539c7f03951fd2e24d.tar.gz
6lowpan: put mcast compression in an own function
This patch moves the mcast compression algorithmn to an own function like all other compression/decompression methods in iphc. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/6lowpan')
-rw-r--r--net/6lowpan/iphc.c59
1 files changed, 32 insertions, 27 deletions
diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index e6cdfc9979ce..346b5c1a9185 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -708,6 +708,37 @@ static u8 lowpan_iphc_tf_compress(u8 **hc_ptr, const struct ipv6hdr *hdr)
return val;
}
+static u8 lowpan_iphc_mcast_addr_compress(u8 **hc_ptr,
+ const struct in6_addr *ipaddr)
+{
+ u8 val;
+
+ if (lowpan_is_mcast_addr_compressable8(ipaddr)) {
+ pr_debug("compressed to 1 octet\n");
+ /* use last byte */
+ lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[15], 1);
+ val = LOWPAN_IPHC_DAM_11;
+ } else if (lowpan_is_mcast_addr_compressable32(ipaddr)) {
+ pr_debug("compressed to 4 octets\n");
+ /* second byte + the last three */
+ lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[1], 1);
+ lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[13], 3);
+ val = LOWPAN_IPHC_DAM_10;
+ } else if (lowpan_is_mcast_addr_compressable48(ipaddr)) {
+ pr_debug("compressed to 6 octets\n");
+ /* second byte + the last five */
+ lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[1], 1);
+ lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[11], 5);
+ val = LOWPAN_IPHC_DAM_01;
+ } else {
+ pr_debug("using full address\n");
+ lowpan_push_hc_data(hc_ptr, ipaddr->s6_addr, 16);
+ val = LOWPAN_IPHC_DAM_00;
+ }
+
+ return val;
+}
+
int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
const void *daddr, const void *saddr)
{
@@ -804,33 +835,7 @@ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
if (addr_type & IPV6_ADDR_MULTICAST) {
pr_debug("destination address is multicast: ");
iphc1 |= LOWPAN_IPHC_M;
- if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
- pr_debug("compressed to 1 octet\n");
- iphc1 |= LOWPAN_IPHC_DAM_11;
- /* use last byte */
- lowpan_push_hc_data(&hc_ptr,
- &hdr->daddr.s6_addr[15], 1);
- } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
- pr_debug("compressed to 4 octets\n");
- iphc1 |= LOWPAN_IPHC_DAM_10;
- /* second byte + the last three */
- lowpan_push_hc_data(&hc_ptr,
- &hdr->daddr.s6_addr[1], 1);
- lowpan_push_hc_data(&hc_ptr,
- &hdr->daddr.s6_addr[13], 3);
- } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
- pr_debug("compressed to 6 octets\n");
- iphc1 |= LOWPAN_IPHC_DAM_01;
- /* second byte + the last five */
- lowpan_push_hc_data(&hc_ptr,
- &hdr->daddr.s6_addr[1], 1);
- lowpan_push_hc_data(&hc_ptr,
- &hdr->daddr.s6_addr[11], 5);
- } else {
- pr_debug("using full address\n");
- iphc1 |= LOWPAN_IPHC_DAM_00;
- lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16);
- }
+ iphc1 |= lowpan_iphc_mcast_addr_compress(&hc_ptr, &hdr->daddr);
} else {
if (addr_type & IPV6_ADDR_LINKLOCAL) {
/* TODO: context lookup */