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6loWPAN: Fix a missing source address in header. Correct calculation of payload size.

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This commit is contained in:
Gregory Nutt 2017-04-19 13:33:20 -06:00
parent d3e1ea84f6
commit 50fda0d748
7 changed files with 51 additions and 39 deletions
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4
include/nuttx/net/netconfig.h
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@ -309,7 +309,7 @@
#endif
#ifdef CONFIG_NET_6LOWPAN
# define IEEE802154_UDP_MSS(h) (CONFIG_NET_6LOWPAN_MAXPAYLOAD - UDP_HDRLEN - (h))
# define IEEE802154_UDP_MSS(h) (CONFIG_NET_6LOWPAN_MTU - UDP_HDRLEN - (h))
# ifndef CONFIG_NET_MULTILINK
# define __MIN_UDP_MSS(h) IEEE802154_UDP_MSS(h)
# define __MAX_UDP_MSS(h) IEEE802154_UDP_MSS(h)
@ -484,7 +484,7 @@
#endif
#ifdef CONFIG_NET_6LOWPAN
# define IEEE802154_TCP_MSS(h) (CONFIG_NET_6LOWPAN_MAXPAYLOAD - TCP_HDRLEN - (h))
# define IEEE802154_TCP_MSS(h) (CONFIG_NET_6LOWPAN_MTU - TCP_HDRLEN - (h))
# ifndef CONFIG_NET_MULTILINK
# define __MIN_TCP_MSS(h) IEEE802154_TCP_MSS(h)
# define __MAX_TCP_MSS(h) IEEE802154_TCP_MSS(h)

9
net/sixlowpan/Kconfig
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@ -156,15 +156,6 @@ config NET_6LOWPAN_MAX_MACTRANSMITS
layer should resend packets if no link-layer ACK wasreceived. This
only makes sense with the csma_driver.
config NET_6LOWPAN_MAXPAYLOAD
int "Max packet size"
default 102
---help---
NET_6LOWPAN_MAXPAYLOAD specifies the maximum size of packets
before they get fragmented. The default is 127 bytes (the maximum size
of a 802.15.4 frame) - 25 bytes (for the 802.15.4 MAClayer header). This
can be increased for systems with larger packet sizes.
config NET_6LOWPAN_MTU
int "6LoWPAN packet buffer size"
default 1294

21
net/sixlowpan/README.txt
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@ -33,7 +33,7 @@ Optimal 6loWPAN Configuration
Fragmentation Headers
---------------------
A fragment header is placed at the beginning of the outgoing packet just
after the FCF when the payload is too large to fit in a single IEEE 802.15.4
after the MAC when the payload is too large to fit in a single IEEE 802.15.4
frame. The fragment header contains three fields: Datagram size, datagram tag
and datagram offset.
@ -47,7 +47,7 @@ The length of the fragment header length is four bytes for the first header
(FRAG1) and five bytes for all subsequent headers (FRAGN). For example,
this is a HC1 compressed first frame of a packet
01 08 01 0000 3412 ### 7-byte FCF header
41 88 01 0000 3412 cdab ### 9-byte MAC header
c50e 000b ### 4-byte FRAG1 header
42 ### SIXLOWPAN_DISPATCH_HC1
fb ### RIME_HC1_HC_UDP_HC1_ENCODING
@ -56,14 +56,15 @@ this is a HC1 compressed first frame of a packet
10 ### RIME_HC1_HC_UDP_PORTS
0000 ### RIME_HC1_HC_UDP_CHKSUM
80 byte Payload follows:
104 byte Payload follows:
4f4e452064617920 48656e6e792d7065 6e6e792077617320 7069636b696e6720
757020636f726e20 696e207468652063 6f726e7961726420 7768656e2d2d7768
61636b212d2d736f 6d657468696e6720 g
61636b212d2d736f 6d657468696e6720 6869742068657220 75706f6e20746865
20686561642e2027
This is the second frame of the same transfer:
01 08 01 0000 3412 ### 7-byte FCF header
41 88 01 0000 3412 cdab ### 9-byte MAC header
e50e 000b 0a ### 5 byte FRAGN header
42 ### SIXLOWPAN_DISPATCH_HC1
fb ### RIME_HC1_HC_UDP_HC1_ENCODING
@ -72,11 +73,11 @@ This is the second frame of the same transfer:
10 ### RIME_HC1_HC_UDP_PORTS
0000 ### RIME_HC1_HC_UDP_CHKSUM
80 byte Payload follows:
6869742068657220 75706f6e20746865 20686561642e2027 476f6f646e657373
2067726163696f75 73206d6521272073 6169642048656e6e 792d70656e6e793b
202774686520736b 79277320612d676f
104 byte Payload follows:
476f6f646e657373 2067726163696f75 73206d6521272073 6169642048656e6e
792d70656e6e793b 202774686520736b 79277320612d676f 696e6720746f2066
616c6c3b2049206d 75737420676f2061 6e642074656c6c20 746865206b696e67
2e270a0a536f2073
The payload length is encoded in the LS 11-bits of the first 16-bit value:
In this example the payload size is 0x050e or 1,294. The tag is 0x000b. In

13
net/sixlowpan/sixlowpan_framelist.c
View File

@ -281,6 +281,11 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
ninfo("Sending packet length %d\n", buflen);
/* Set the source and destinatino address */
rimeaddr_copy(&g_pktaddrs[PACKETBUF_ADDR_SENDER], &ieee->i_nodeaddr);
rimeaddr_copy(&g_pktaddrs[PACKETBUF_ADDR_RECEIVER], destmac);
/* Pre-calculate frame header length. */
framer_hdrlen = sixlowpan_send_hdrlen(ieee, ieee->i_panid);
@ -317,11 +322,9 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
ninfo("Header of length %d\n", g_frame_hdrlen);
rimeaddr_copy(&g_pktaddrs[PACKETBUF_ADDR_RECEIVER], destmac);
/* Check if we need to fragment the packet into several frames */
if (buflen > (CONFIG_NET_6LOWPAN_MAXPAYLOAD - g_frame_hdrlen))
if (buflen > (CONFIG_NET_6LOWPAN_FRAMELEN - g_frame_hdrlen))
{
#ifdef CONFIG_NET_6LOWPAN_FRAG
/* ieee->i_framelist will hold the generated frames; frames will be
@ -384,7 +387,7 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
* bytes.
*/
paysize = (CONFIG_NET_6LOWPAN_MAXPAYLOAD - g_frame_hdrlen) & ~7;
paysize = (CONFIG_NET_6LOWPAN_FRAMELEN - g_frame_hdrlen) & ~7;
memcpy(fptr + g_frame_hdrlen, buf, paysize);
/* Set outlen to what we already sent from the IP payload */
@ -457,7 +460,7 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
/* Copy payload and enqueue */
/* Check for the last fragment */
paysize = (CONFIG_NET_6LOWPAN_MAXPAYLOAD - fragn_hdrlen) &
paysize = (CONFIG_NET_6LOWPAN_FRAMELEN - fragn_hdrlen) &
SIXLOWPAN_DISPATCH_FRAG_MASK;
if (buflen - outlen < paysize)
{

33
net/sixlowpan/sixlowpan_framer.c
View File

@ -70,11 +70,11 @@
struct field_length_s
{
uint8_t dest_pid_len; /**< Length (in bytes) of destination PAN ID field */
uint8_t dest_addr_len; /**< Length (in bytes) of destination address field */
uint8_t src_pid_len; /**< Length (in bytes) of source PAN ID field */
uint8_t src_addr_len; /**< Length (in bytes) of source address field */
uint8_t aux_sec_len; /**< Length (in bytes) of aux security header field */
uint8_t dest_pid_len; /* Length (in bytes) of destination PAN ID field */
uint8_t dest_addr_len; /* Length (in bytes) of destination address field */
uint8_t src_pid_len; /* Length (in bytes) of source PAN ID field */
uint8_t src_addr_len; /* Length (in bytes) of source address field */
uint8_t aux_sec_len; /* Length (in bytes) of aux security header field */
};
/****************************************************************************
@ -179,10 +179,17 @@ static void sixlowpan_fieldlengths(FAR struct frame802154_s *finfo,
(finfo->fcf.src_addr_mode & 3) != 0 &&
finfo->src_pid == finfo->dest_pid)
{
/* Indicate source PANID compression */
finfo->fcf.panid_compression = 1;
/* Compressed header, only do dest pid */
/* flen->src_pid_len = 0; */
/* Compressed header, only do dest pid.
*
* REVISIT: This was commented out in corresponding Contiki logic, but
* is needed to match sixlowpan_recv_hdrlen().
*/
flen->src_pid_len = 0;
}
/* Determine address lengths */
@ -348,7 +355,7 @@ static void sixlowpan_setup_params(FAR struct ieee802154_driver_s *ieee,
rimeaddr_copy((struct rimeaddr_s *)&params->dest_addr,
g_pktaddrs[PACKETBUF_ADDR_RECEIVER].u8);
/* Use short address mode if so configured */
/* Use short destination address mode if so configured */
#ifdef CONFIG_NET_6LOWPAN_RIMEADDR_EXTENDED
params->fcf.dest_addr_mode = FRAME802154_LONGADDRMODE;
@ -359,7 +366,15 @@ static void sixlowpan_setup_params(FAR struct ieee802154_driver_s *ieee,
/* Set the source address to the node address assigned to the device */
rimeaddr_copy((struct rimeaddr_s *)&params->src_addr, &ieee->i_nodeaddr.u8);
rimeaddr_copy((struct rimeaddr_s *)&params->src_addr, &ieee->i_nodeaddr);
/* Use short soruce address mode if so configured */
#ifdef CONFIG_NET_6LOWPAN_RIMEADDR_EXTENDED
params->fcf.src_addr_mode = FRAME802154_LONGADDRMODE;
#else
params->fcf.src_addr_mode = FRAME802154_SHORTADDRMODE;
#endif
}
/****************************************************************************

4
net/sixlowpan/sixlowpan_input.c
View File

@ -167,7 +167,7 @@ int sixlowpan_recv_hdrlen(FAR const uint8_t *fptr)
}
else if (addrmode == FRAME802154_LONGADDRMODE)
{
/* 2 byte dest PAN + 6 byte dest long address */
/* 2 byte dest PAN + 8 byte dest long address */
hdrlen += 10;
}
@ -193,6 +193,8 @@ int sixlowpan_recv_hdrlen(FAR const uint8_t *fptr)
}
else
{
/* Add source PANID if PANIDs are not compressed */
if ((fptr[0] & (1 << FRAME802154_PANIDCOMP_SHIFT)) == 0)
{
hdrlen += 2;

6
net/sixlowpan/sixlowpan_internal.h
View File

@ -221,9 +221,9 @@ struct frame802154_fcf_s
struct frame802154_scf_s
{
uint8_t security_level; /* 3 bit. security level */
uint8_t key_id_mode; /* 2 bit. Key identifier mode */
uint8_t reserved; /* 3 bit. Reserved bits */
uint8_t security_level; /* 3 bit. security level */
uint8_t key_id_mode; /* 2 bit. Key identifier mode */
uint8_t reserved; /* 3 bit. Reserved bits */
};
/* 802.15.4 Aux security header */