[Linux-zigbee-devel] [PATCH series][6LoWPAN][net-next]
Hello all, The following patch series adds both major feature and minor fixes. Please find detailed description in each of the patches. Just to summarize current development status: By using MAC and PHY layers support from "http://sourceforge.net/projects/linux-zigbee"; project now it's possible to run generic network applications (ssh, iperf) over ieee802.15.4 network. iperf shows about ~40Kbits/sec for TCP With best regards, Alexander -- RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 ___ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
[Linux-zigbee-devel] [PATCH 1/6] [6LoWPAN] add fragmentation support
This patch adds support for frame fragmentation.
Signed-off-by: Alexander Smirnov
---
include/net/ieee802154.h |6 +
net/ieee802154/6lowpan.c | 260 +-
net/ieee802154/6lowpan.h | 18 +++
3 files changed, 280 insertions(+), 4 deletions(-)
diff --git a/include/net/ieee802154.h b/include/net/ieee802154.h
index d52685d..ee59f8b 100644
--- a/include/net/ieee802154.h
+++ b/include/net/ieee802154.h
@@ -21,11 +21,14 @@
* Maxim Gorbachyov
* Maxim Osipov
* Dmitry Eremin-Solenikov
+ * Alexander Smirnov
*/
#ifndef NET_IEEE802154_H
#define NET_IEEE802154_H
+#define IEEE802154_MTU 127
+
#define IEEE802154_FC_TYPE_BEACON 0x0 /* Frame is beacon */
#defineIEEE802154_FC_TYPE_DATA 0x1 /* Frame is data */
#define IEEE802154_FC_TYPE_ACK 0x2 /* Frame is acknowledgment */
@@ -56,6 +59,9 @@
(((x) & IEEE802154_FC_DAMODE_MASK) >> IEEE802154_FC_DAMODE_SHIFT)
+/* MAC footer size */
+#define IEEE802154_MFR_SIZE2 /* 2 octets */
+
/* MAC's Command Frames Identifiers */
#define IEEE802154_CMD_ASSOCIATION_REQ 0x01
#define IEEE802154_CMD_ASSOCIATION_RESP0x02
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 19d6aef..7d4cb58 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -113,6 +113,20 @@ struct lowpan_dev_record {
struct list_head list;
};
+struct lowpan_fragment {
+ struct sk_buff *skb; /* skb to be assembled */
+ spinlock_t lock; /* concurency lock */
+ u16 length; /* length to be assemled */
+ u32 bytes_rcv; /* bytes received */
+ u16 tag;/* current fragment tag */
+ struct timer_list timer; /* assembling timer */
+ struct list_headlist; /* fragments list */
+};
+
+static unsigned short fragment_tag;
+static LIST_HEAD(lowpan_fragments);
+spinlock_t flist_lock;
+
static inline struct
lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
{
@@ -244,6 +258,17 @@ static u8 lowpan_fetch_skb_u8(struct sk_buff *skb)
return ret;
}
+static u16 lowpan_fetch_skb_u16(struct sk_buff *skb)
+{
+ u16 ret;
+
+ BUG_ON(!pskb_may_pull(skb, 2));
+
+ ret = skb->data[0] | (skb->data[1] << 8);
+ skb_pull(skb, 2);
+ return ret;
+}
+
static int lowpan_header_create(struct sk_buff *skb,
struct net_device *dev,
unsigned short type, const void *_daddr,
@@ -467,6 +492,7 @@ static int lowpan_header_create(struct sk_buff *skb,
memcpy(&(sa.hwaddr), saddr, 8);
mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
+
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
type, (void *)&da, (void *)&sa, skb->len);
}
@@ -511,6 +537,21 @@ static int lowpan_skb_deliver(struct sk_buff *skb, struct
ipv6hdr *hdr)
return stat;
}
+static void lowpan_fragment_timer_expired(unsigned long entry_addr)
+{
+ struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
+
+ pr_debug("%s: timer expired for frame with tag %d\n", __func__,
+ entry->tag);
+
+ spin_lock(&flist_lock);
+ list_del(&entry->list);
+ spin_unlock(&flist_lock);
+
+ dev_kfree_skb(entry->skb);
+ kfree(entry);
+}
+
static int
lowpan_process_data(struct sk_buff *skb)
{
@@ -525,6 +566,107 @@ lowpan_process_data(struct sk_buff *skb)
if (skb->len < 2)
goto drop;
iphc0 = lowpan_fetch_skb_u8(skb);
+
+ /* fragments assembling */
+ switch (iphc0 & LOWPAN_DISPATCH_MASK) {
+ case LOWPAN_DISPATCH_FRAG1:
+ case LOWPAN_DISPATCH_FRAGN:
+ {
+ struct lowpan_fragment *frame;
+ u8 len, offset;
+ u16 tag;
+ bool found = false;
+
+ len = lowpan_fetch_skb_u8(skb); /* frame length */
+ tag = lowpan_fetch_skb_u16(skb);
+
+ /*
+* check if frame assembling with the same tag is
+* already in progress
+*/
+ spin_lock(&flist_lock);
+
+ list_for_each_entry(frame, &lowpan_fragments, list)
+ if (frame->tag == tag) {
+ found = true;
+ break;
+ }
+
+ /* alloc new frame structure */
+ if (!found) {
+ frame = kzalloc(sizeof(struct lowpan_fragment),
+ GFP_ATOMIC);
+ if (!frame)
+ goto unlock_and_drop;
+
+
[Linux-zigbee-devel] [PATCH 2/6] disable debugging by default
This patch disables debug output enabled by default. Signed-off-by: Alexander Smirnov Acked-by: Dmitry Eremin-Solenikov --- net/ieee802154/6lowpan.c |2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c index 7d4cb58..af5553e 100644 --- a/net/ieee802154/6lowpan.c +++ b/net/ieee802154/6lowpan.c @@ -50,8 +50,6 @@ * SUCH DAMAGE. */ -#define DEBUG - #include #include #include -- 1.7.2.5 -- RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 ___ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
[Linux-zigbee-devel] [PATCH 3/6] set proper netdev flags
This patch fixes settings for device initialization which makes possible to use NDISC and TCP. Signed-off-by: Alexander Smirnov Acked-by: Dmitry Eremin-Solenikov --- net/ieee802154/6lowpan.c |3 +-- 1 files changed, 1 insertions(+), 2 deletions(-) diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c index af5553e..39ec6e0 100644 --- a/net/ieee802154/6lowpan.c +++ b/net/ieee802154/6lowpan.c @@ -973,13 +973,12 @@ static void lowpan_setup(struct net_device *dev) dev->addr_len = IEEE802154_ADDR_LEN; memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); dev->type = ARPHRD_IEEE802154; - dev->features = NETIF_F_NO_CSUM; /* Frame Control + Sequence Number + Address fields + Security Header */ dev->hard_header_len= 2 + 1 + 20 + 14; dev->needed_tailroom= 2; /* FCS */ dev->mtu= 1281; dev->tx_queue_len = 0; - dev->flags = IFF_NOARP | IFF_BROADCAST; + dev->flags = IFF_BROADCAST | IFF_MULTICAST; dev->watchdog_timeo = 0; dev->netdev_ops = &lowpan_netdev_ops; -- 1.7.2.5 -- RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 ___ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
[Linux-zigbee-devel] [PATCH 4/6] UDP header compression
This patch adds support for UDP header compression.
Derived from Contiki OS.
Signed-off-by: Alexander Smirnov
---
net/ieee802154/6lowpan.c | 51 ++---
net/ieee802154/6lowpan.h |5
2 files changed, 52 insertions(+), 4 deletions(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 39ec6e0..9bf82d7 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -246,6 +246,50 @@ lowpan_uncompress_addr(struct sk_buff *skb, struct
in6_addr *ipaddr,
return 0;
}
+static void
+lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
+{
+ struct udphdr *uh = udp_hdr(skb);
+
+ pr_debug("(%s): UDP header compression\n", __func__);
+
+ if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
+ LOWPAN_NHC_UDP_4BIT_PORT) &&
+ ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
+ LOWPAN_NHC_UDP_4BIT_PORT)) {
+ pr_debug("(%s): both ports compression to 4 bits\n", __func__);
+ **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
+ **(hc06_ptr + 1) = /* subtraction is faster */
+ (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
+ ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
+ *hc06_ptr += 2;
+ } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
+ LOWPAN_NHC_UDP_8BIT_PORT) {
+ pr_debug("(%s): remove 8 bits of dest\n", __func__);
+ **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
+ memcpy(*hc06_ptr + 1, &uh->source, 2);
+ **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
+ *hc06_ptr += 4;
+ } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
+ LOWPAN_NHC_UDP_8BIT_PORT) {
+ pr_debug("(%s): remove 8 bits of source\n", __func__);
+ **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
+ memcpy(*hc06_ptr + 1, &uh->dest, 2);
+ **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
+ *hc06_ptr += 4;
+ } else {
+ pr_debug("(%s): can't compress header\n", __func__);
+ **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
+ memcpy(*hc06_ptr + 1, &uh->source, 2);
+ memcpy(*hc06_ptr + 3, &uh->dest, 2);
+ *hc06_ptr += 5;
+ }
+
+ /* checksum is always inline */
+ memcpy(*hc06_ptr, &uh->check, 2);
+ *hc06_ptr += 2;
+}
+
static u8 lowpan_fetch_skb_u8(struct sk_buff *skb)
{
u8 ret;
@@ -365,8 +409,6 @@ static int lowpan_header_create(struct sk_buff *skb,
if (hdr->nexthdr == UIP_PROTO_UDP)
iphc0 |= LOWPAN_IPHC_NH_C;
-/* TODO: next header compression */
-
if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
*hc06_ptr = hdr->nexthdr;
hc06_ptr += 1;
@@ -454,8 +496,9 @@ static int lowpan_header_create(struct sk_buff *skb,
}
}
- /* TODO: UDP header compression */
- /* TODO: Next Header compression */
+ /* UDP header compression */
+ if (hdr->nexthdr == UIP_PROTO_UDP)
+ lowpan_compress_udp_header(&hc06_ptr, skb);
head[0] = iphc0;
head[1] = iphc1;
diff --git a/net/ieee802154/6lowpan.h b/net/ieee802154/6lowpan.h
index 5d2e5a0..aeff3f3 100644
--- a/net/ieee802154/6lowpan.h
+++ b/net/ieee802154/6lowpan.h
@@ -219,6 +219,11 @@
#define LOWPAN_NHC_UDP_CHECKSUMC 0x04
#define LOWPAN_NHC_UDP_CHECKSUMI 0x00
+#define LOWPAN_NHC_UDP_4BIT_PORT 0xF0B0
+#define LOWPAN_NHC_UDP_4BIT_MASK 0xFFF0
+#define LOWPAN_NHC_UDP_8BIT_PORT 0xF000
+#define LOWPAN_NHC_UDP_8BIT_MASK 0xFF00
+
/* values for port compression, _with checksum_ ie bit 5 set to 0 */
#define LOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */
#define LOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline,
--
1.7.2.5
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[Linux-zigbee-devel] [PATCH 5/6] [6LoWPAN] UDP header decompression
This patch provides possibility to decompress UDP headers.
Derived from Contiki OS.
Signed-off-by: Alexander Smirnov
---
net/ieee802154/6lowpan.c | 61 +-
1 files changed, 60 insertions(+), 1 deletions(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 9bf82d7..602f318 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -311,6 +311,62 @@ static u16 lowpan_fetch_skb_u16(struct sk_buff *skb)
return ret;
}
+static int
+lowpan_uncompress_udp_header(struct sk_buff *skb)
+{
+ struct udphdr *uh = udp_hdr(skb);
+ u8 tmp;
+
+ tmp = lowpan_fetch_skb_u8(skb);
+
+ if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
+ pr_debug("(%s): UDP header uncompression\n", __func__);
+ switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
+ case LOWPAN_NHC_UDP_CS_P_00:
+ memcpy(&uh->source, &skb->data[0], 2);
+ memcpy(&uh->dest, &skb->data[2], 2);
+ skb_pull(skb, 4);
+ break;
+ case LOWPAN_NHC_UDP_CS_P_01:
+ memcpy(&uh->source, &skb->data[0], 2);
+ uh->dest =
+ skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
+ skb_pull(skb, 3);
+ break;
+ case LOWPAN_NHC_UDP_CS_P_10:
+ uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
+ memcpy(&uh->dest, &skb->data[1], 2);
+ skb_pull(skb, 3);
+ break;
+ case LOWPAN_NHC_UDP_CS_P_11:
+ uh->source =
+ LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
+ uh->dest =
+ LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
+ skb_pull(skb, 1);
+ break;
+ default:
+ pr_debug("(%s) ERROR: unknown UDP format\n", __func__);
+ goto err;
+ break;
+ }
+
+ pr_debug("(%s): uncompressed UDP ports: src = %d, dst = %d\n",
+ __func__, uh->source, uh->dest);
+
+ /* copy checksum */
+ memcpy(&uh->check, &skb->data[0], 2);
+ skb_pull(skb, 2);
+ } else {
+ pr_debug("(%s): ERROR: unsupported NH format\n", __func__);
+ goto err;
+ }
+
+ return 0;
+err:
+ return -EINVAL;
+}
+
static int lowpan_header_create(struct sk_buff *skb,
struct net_device *dev,
unsigned short type, const void *_daddr,
@@ -842,7 +898,10 @@ lowpan_process_data(struct sk_buff *skb)
goto drop;
}
- /* TODO: UDP header parse */
+ /* UDP data uncompression */
+ if (iphc0 & LOWPAN_IPHC_NH_C)
+ if (lowpan_uncompress_udp_header(skb))
+ goto drop;
/* Not fragmented package */
hdr.payload_len = htons(skb->len);
--
1.7.2.5
--
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[Linux-zigbee-devel] [PATCH 6/6] [6LoWPAN] update documentation
This patch adds chapter to documentation which describes how to use 6lowpan technology. Signed-off-by: Alexander Smirnov --- Documentation/networking/ieee802154.txt | 27 +++ 1 files changed, 27 insertions(+), 0 deletions(-) diff --git a/Documentation/networking/ieee802154.txt b/Documentation/networking/ieee802154.txt index 23c995e..83cbee4 100644 --- a/Documentation/networking/ieee802154.txt +++ b/Documentation/networking/ieee802154.txt @@ -78,3 +78,30 @@ in software. This is currently WIP. See header include/net/mac802154.h and several drivers in drivers/ieee802154/. +6LoWPAN Linux implementation + + +The IEEE 802.15.4 standard specifies an MTU of 128 bytes, yielding about 80 +octets of actual MAC payload once security is turned on, on a wireless link +with a link throughput of 250 kbps or less. The 6LoWPAN adaptation format +[RFC4944] was specified to carry IPv6 datagrams over such constrained links, +taking into account limited bandwidth, memory, or energy resources that are +expected in applications such as wireless Sensor Networks. [RFC4944] defines +a Mesh Addressing header to support sub-IP forwarding, a Fragmentation header +to support the IPv6 minimum MTU requirement [RFC2460], and stateless header +compression for IPv6 datagrams (LOWPAN_HC1 and LOWPAN_HC2) to reduce the +relatively large IPv6 and UDP headers down to (in the best case) several bytes. + +In Semptember 2011 the standard update was published - [RFC6282]. +It deprecates HC1 and HC2 compression and defines IPHC encoding format which is +used in this Linux implementation. + +All the code related to 6lowpan you may find in files: net/ieee802154/6lowpan.* + +To setup 6lowpan interface you need (busybox release > 1.17.0): +1. Add IEEE802.15.4 interface and initialize PANid; +2. Add 6lowpan interface by command like: + # ip link add link wpan0 name lowpan0 type lowpan +3. Set MAC (if needs): + # ip link set lowpan0 address de:ad:be:ef:ca:fe:ba:be +4. Bring up 'lowpan0' interface -- 1.7.2.5 -- RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 ___ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
