diff options
| author | Alexander Aring <alex.aring@gmail.com> | 2015-10-20 08:31:26 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2015-10-21 00:49:25 +0200 |
| commit | 09bf420f101c9d35ca0b5f539c7f03951fd2e24d (patch) | |
| tree | 1a7cc7bd86376d5bdaa2b316d89479c2b2420c04 /net/6lowpan/iphc.c | |
| parent | b5af9bdbfe6d497d27e5936a7d110fc5f64e7c0d (diff) | |
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/iphc.c')
| -rw-r--r-- | net/6lowpan/iphc.c | 59 |
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 */ |