diff options
| author | Luiz Augusto von Dentz <luiz.von.dentz@intel.com> | 2017-03-12 10:19:37 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2017-04-12 22:02:36 +0200 |
| commit | fa09ae661fb5ab6f9826545d5128f2b7393bcf4a (patch) | |
| tree | 3e97a905cfc5182279062b77b3be654db917876a /net/6lowpan | |
| parent | 8a7a4b476719df1e06f8eae837b13bdf79908843 (diff) | |
| download | linux-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.c | 49 |
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; } |