sicslowpan: Fixed too aggresive fragmentation
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kkrentz
parent
2cf7d98cad
commit
677c078302
5 changed files with 35 additions and 13 deletions
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@ -220,13 +220,12 @@
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#define SICSLOWPAN_CONF_FRAG 1
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#endif /* SICSLOWPAN_CONF_FRAG */
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/* SICSLOWPAN_CONF_MAC_MAX_PAYLOAD specifies the maximum size of
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packets before they get fragmented. The default is 127 bytes (the
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maximum size of a 802.15.4 frame) - 25 bytes (for the 802.15.4 MAC
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layer header). This can be increased for systems with larger packet
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sizes. */
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/* SICSLOWPAN_CONF_MAC_MAX_PAYLOAD is the maximum available size for
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frame headers, link layer security-related overhead, as well as
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6LoWPAN payload. By default, SICSLOWPAN_CONF_MAC_MAX_PAYLOAD is
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127 bytes (MTU of 802.15.4) - 2 bytes (Footer of 802.15.4). */
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#ifndef SICSLOWPAN_CONF_MAC_MAX_PAYLOAD
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#define SICSLOWPAN_CONF_MAC_MAX_PAYLOAD (127 - 25)
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#define SICSLOWPAN_CONF_MAC_MAX_PAYLOAD (127 - 2)
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#endif /* SICSLOWPAN_CONF_MAC_MAX_PAYLOAD */
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/* SICSLOWPAN_CONF_COMPRESSION_THRESHOLD sets a lower threshold for
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@ -155,11 +155,13 @@ void uip_log(char *msg);
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/** @} */
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/** \brief Size of the 802.15.4 payload (127byte - 25 for MAC header) */
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/** \brief Maximum available size for frame headers,
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link layer security-related overhead, as well as
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6LoWPAN payload. */
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#ifdef SICSLOWPAN_CONF_MAC_MAX_PAYLOAD
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#define MAC_MAX_PAYLOAD SICSLOWPAN_CONF_MAC_MAX_PAYLOAD
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#else /* SICSLOWPAN_CONF_MAC_MAX_PAYLOAD */
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#define MAC_MAX_PAYLOAD 102
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#define MAC_MAX_PAYLOAD (127 - 2)
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#endif /* SICSLOWPAN_CONF_MAC_MAX_PAYLOAD */
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@ -1361,6 +1363,7 @@ static uint8_t
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output(const uip_lladdr_t *localdest)
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{
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int framer_hdrlen;
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int max_payload;
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/* The MAC address of the destination of the packet */
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linkaddr_t dest;
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@ -1443,8 +1446,9 @@ output(const uip_lladdr_t *localdest)
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#else /* USE_FRAMER_HDRLEN */
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framer_hdrlen = 21;
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#endif /* USE_FRAMER_HDRLEN */
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max_payload = MAC_MAX_PAYLOAD - framer_hdrlen - NETSTACK_LLSEC.get_overhead();
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if((int)uip_len - (int)uncomp_hdr_len > (int)MAC_MAX_PAYLOAD - framer_hdrlen - (int)packetbuf_hdr_len) {
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if((int)uip_len - (int)uncomp_hdr_len > max_payload - (int)packetbuf_hdr_len) {
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#if SICSLOWPAN_CONF_FRAG
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struct queuebuf *q;
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/*
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@ -1477,7 +1481,7 @@ output(const uip_lladdr_t *localdest)
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/* Copy payload and send */
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packetbuf_hdr_len += SICSLOWPAN_FRAG1_HDR_LEN;
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packetbuf_payload_len = (MAC_MAX_PAYLOAD - framer_hdrlen - packetbuf_hdr_len) & 0xfffffff8;
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packetbuf_payload_len = (max_payload - packetbuf_hdr_len) & 0xfffffff8;
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PRINTFO("(len %d, tag %d)\n", packetbuf_payload_len, my_tag);
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memcpy(packetbuf_ptr + packetbuf_hdr_len,
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(uint8_t *)UIP_IP_BUF + uncomp_hdr_len, packetbuf_payload_len);
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@ -1513,7 +1517,7 @@ output(const uip_lladdr_t *localdest)
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/* uip_htons((SICSLOWPAN_DISPATCH_FRAGN << 8) | uip_len); */
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SET16(PACKETBUF_FRAG_PTR, PACKETBUF_FRAG_DISPATCH_SIZE,
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((SICSLOWPAN_DISPATCH_FRAGN << 8) | uip_len));
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packetbuf_payload_len = (MAC_MAX_PAYLOAD - framer_hdrlen - packetbuf_hdr_len) & 0xfffffff8;
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packetbuf_payload_len = (max_payload - packetbuf_hdr_len) & 0xfffffff8;
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while(processed_ip_out_len < uip_len) {
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PRINTFO("sicslowpan output: fragment ");
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PACKETBUF_FRAG_PTR[PACKETBUF_FRAG_OFFSET] = processed_ip_out_len >> 3;
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@ -85,6 +85,9 @@ struct llsec_driver {
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* filters out injected or replayed frames.
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*/
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void (* input)(void);
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/** Returns the security-related overhead per frame in bytes */
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uint8_t (* get_overhead)(void);
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};
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#endif /* LLSEC_H_ */
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@ -65,6 +65,8 @@
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0x0C , 0x0D , 0x0E , 0x0F }
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#endif /* NONCORESEC_CONF_KEY */
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#define SECURITY_HEADER_LENGTH 5
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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@ -192,6 +194,12 @@ input(void)
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NETSTACK_NETWORK.input();
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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get_overhead(void)
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{
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return SECURITY_HEADER_LENGTH + LLSEC802154_MIC_LENGTH;
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}
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/*---------------------------------------------------------------------------*/
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static void
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bootstrap(llsec_on_bootstrapped_t on_bootstrapped)
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{
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@ -205,7 +213,8 @@ const struct llsec_driver noncoresec_driver = {
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bootstrap,
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send,
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on_frame_created,
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input
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input,
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get_overhead
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};
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/*---------------------------------------------------------------------------*/
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@ -73,12 +73,19 @@ input(void)
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NETSTACK_NETWORK.input();
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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get_overhead(void)
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{
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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const struct llsec_driver nullsec_driver = {
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"nullsec",
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bootstrap,
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send,
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on_frame_created,
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input
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input,
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get_overhead
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};
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/*---------------------------------------------------------------------------*/
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