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Message-Id: <20170302132335.21192-6-luiz.dentz@gmail.com>
Date: Thu, 2 Mar 2017 15:23:34 +0200
From: Luiz Augusto von Dentz <luiz.dentz@...il.com>
To: linux-bluetooth@...r.kernel.org
Cc: patrik.flykt@...ux.intel.com, aar@...gutronix.de,
jukka.rissanen@...ux.intel.com, linux-wpan@...r.kernel.org,
netdev@...r.kernel.org
Subject: [PATCH v6 5/6] 6lowpan: Use netdev addr_len to determine lladdr len
From: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
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@...el.com>
Reviewed-by: Stefan Schmidt <stefan@....samsung.com>
---
include/net/6lowpan.h | 19 +++++++++++++++++++
net/6lowpan/iphc.c | 49 ++++++++++++++++++++++++++++++++++++++-----------
net/bluetooth/6lowpan.c | 42 ++++++------------------------------------
3 files changed, 63 insertions(+), 47 deletions(-)
diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h
index 5ab4c99..c5792cb 100644
--- a/include/net/6lowpan.h
+++ b/include/net/6lowpan.h
@@ -198,6 +198,25 @@ static inline void lowpan_iphc_uncompress_eui64_lladdr(struct in6_addr *ipaddr,
ipaddr->s6_addr[8] ^= 0x02;
}
+static inline void lowpan_iphc_uncompress_eui48_lladdr(struct in6_addr *ipaddr,
+ const void *lladdr)
+{
+ /* fe:80::XXXX:XXff:feXX:XXXX
+ * \_________________/
+ * hwaddr
+ */
+ ipaddr->s6_addr[0] = 0xFE;
+ ipaddr->s6_addr[1] = 0x80;
+ memcpy(&ipaddr->s6_addr[8], lladdr, 3);
+ ipaddr->s6_addr[11] = 0xFF;
+ ipaddr->s6_addr[12] = 0xFE;
+ memcpy(&ipaddr->s6_addr[13], lladdr + 3, 3);
+ /* second bit-flip (Universe/Local)
+ * is done according RFC2464
+ */
+ ipaddr->s6_addr[8] ^= 0x02;
+}
+
#ifdef DEBUG
/* print data in line */
static inline void raw_dump_inline(const char *caller, char *msg,
diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index fb5f6fa..6b1042e 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;
}
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 1456b01..0b68cfc 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -64,7 +64,7 @@ struct lowpan_peer {
struct l2cap_chan *chan;
/* peer addresses in various formats */
- unsigned char eui64_addr[EUI64_ADDR_LEN];
+ unsigned char lladdr[ETH_ALEN];
struct in6_addr peer_addr;
};
@@ -80,8 +80,6 @@ struct lowpan_btle_dev {
struct delayed_work notify_peers;
};
-static void set_addr(u8 *eui, u8 *addr, u8 addr_type);
-
static inline struct lowpan_btle_dev *
lowpan_btle_dev(const struct net_device *netdev)
{
@@ -277,7 +275,6 @@ static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
const u8 *saddr;
struct lowpan_btle_dev *dev;
struct lowpan_peer *peer;
- unsigned char eui64_daddr[EUI64_ADDR_LEN];
dev = lowpan_btle_dev(netdev);
@@ -287,10 +284,9 @@ static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
if (!peer)
return -EINVAL;
- saddr = peer->eui64_addr;
- set_addr(&eui64_daddr[0], chan->src.b, chan->src_type);
+ saddr = peer->lladdr;
- return lowpan_header_decompress(skb, netdev, &eui64_daddr, saddr);
+ return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr);
}
static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
@@ -477,7 +473,7 @@ static int setup_header(struct sk_buff *skb, struct net_device *netdev,
}
}
- daddr = peer->eui64_addr;
+ daddr = peer->lladdr;
*peer_addr = addr;
*peer_addr_type = addr_type;
lowpan_cb(skb)->chan = peer->chan;
@@ -663,27 +659,6 @@ static struct device_type bt_type = {
.name = "bluetooth",
};
-static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
-{
- /* addr is the BT address in little-endian format */
- eui[0] = addr[5];
- eui[1] = addr[4];
- eui[2] = addr[3];
- eui[3] = 0xFF;
- eui[4] = 0xFE;
- eui[5] = addr[2];
- eui[6] = addr[1];
- eui[7] = addr[0];
-
- /* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
- if (addr_type == BDADDR_LE_PUBLIC)
- eui[0] &= ~0x02;
- else
- eui[0] |= 0x02;
-
- BT_DBG("type %d addr %*phC", addr_type, 8, eui);
-}
-
static void ifup(struct net_device *netdev)
{
int err;
@@ -762,14 +737,9 @@ static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
peer->chan = chan;
memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
- /* RFC 2464 ch. 5 */
- peer->peer_addr.s6_addr[0] = 0xFE;
- peer->peer_addr.s6_addr[1] = 0x80;
- set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
- chan->dst_type);
+ baswap((void *)peer->lladdr, &chan->dst);
- memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
- EUI64_ADDR_LEN);
+ lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr);
/* IPv6 address needs to have the U/L bit set properly so toggle
* it back here.
--
2.9.3
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