111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/* compression.h - Header Compression */
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/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <net/net_buf.h>
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#include <net/sicslowpan/null_fragmentation.h>
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#include <net/netstack.h>
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#include "contiki/ipv6/uip-ds6-nbr.h"
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#define DEBUG 0
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#include "net/ip/uip-debug.h"
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#if UIP_LOGGING
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#include <stdio.h>
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void uip_log(char *msg);
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#define UIP_LOG(m) uip_log(m)
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#else
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#define UIP_LOG(m)
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#endif
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static void
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packet_sent(struct net_mbuf *buf, void *ptr, int status, int transmissions)
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{
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const linkaddr_t *dest = packetbuf_addr(buf, PACKETBUF_ADDR_RECEIVER);
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uip_ds6_link_neighbor_callback(dest, status, transmissions);
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uip_last_tx_status(buf) = status;
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}
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static int fragment(struct net_buf *buf, const uip_lladdr_t *localdest, void *ptr)
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{
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struct net_mbuf *mbuf;
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mbuf = net_mbuf_get_reserve(0);
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if (!mbuf) {
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return 0;
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}
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packetbuf_copyfrom(mbuf, &uip_buf(buf)[UIP_LLH_LEN], uip_len(buf));
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net_buf_put(buf);
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return NETSTACK_LLSEC.send(mbuf, &packet_sent, ptr);
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}
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static int reassemble(struct net_mbuf *mbuf)
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{
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struct net_buf *buf;
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int ret;
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buf = net_buf_get_reserve(0);
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if (!buf) {
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return 0;
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}
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if(packetbuf_datalen(mbuf) > 0 &&
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packetbuf_datalen(mbuf) <= UIP_BUFSIZE - UIP_LLH_LEN) {
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memcpy(uip_buf(buf), packetbuf_dataptr(mbuf),
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packetbuf_datalen(mbuf));
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uip_len(buf) = packetbuf_datalen(mbuf);
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ret = NETSTACK_COMPRESS.uncompress(buf);
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if (!ret) {
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net_buf_put(buf);
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} else {
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net_mbuf_put(mbuf);
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}
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return ret;
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} else {
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PRINTF("packet discarded, datalen %d MAX %d\n",
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packetbuf_datalen(mbuf), UIP_BUFSIZE - UIP_LLH_LEN);
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net_buf_put(buf);
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return 0;
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}
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}
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const struct fragmentation null_fragmentation = {
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fragment,
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reassemble
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};
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