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67e0575bd3
When an UDP packet too big to fit in the uIP packet buffer is to be sent, the part fitting in the uIP buffer is copied to it (so no buffer overflow occurs) but uIP actually sends a packet of the original size therefore a buffer over-read occurs. This modification makes uIP discard the UDP packets that do not fit in the uIP packet buffer.
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* 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 INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Module for sending UDP packets through uIP.
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "contiki-conf.h"
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extern uint16_t uip_slen;
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#include "net/ip/uip-udp-packet.h"
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#include "net/ipv6/multicast/uip-mcast6.h"
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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void
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uip_udp_packet_send(struct uip_udp_conn *c, const void *data, int len)
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{
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#if UIP_UDP
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if(data != NULL && len <= (UIP_BUFSIZE - (UIP_LLH_LEN + UIP_IPUDPH_LEN))) {
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uip_udp_conn = c;
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uip_slen = len;
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memmove(&uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN], data, len);
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uip_process(UIP_UDP_SEND_CONN);
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#if UIP_CONF_IPV6_MULTICAST
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/* Let the multicast engine process the datagram before we send it */
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if(uip_is_addr_mcast_routable(&uip_udp_conn->ripaddr)) {
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UIP_MCAST6.out();
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}
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#endif /* UIP_IPV6_MULTICAST */
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#if NETSTACK_CONF_WITH_IPV6
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tcpip_ipv6_output();
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#else
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if(uip_len > 0) {
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tcpip_output();
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}
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#endif
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}
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uip_slen = 0;
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#endif /* UIP_UDP */
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}
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/*---------------------------------------------------------------------------*/
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void
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uip_udp_packet_sendto(struct uip_udp_conn *c, const void *data, int len,
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const uip_ipaddr_t *toaddr, uint16_t toport)
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{
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uip_ipaddr_t curaddr;
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uint16_t curport;
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if(toaddr != NULL) {
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/* Save current IP addr/port. */
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uip_ipaddr_copy(&curaddr, &c->ripaddr);
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curport = c->rport;
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/* Load new IP addr/port */
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uip_ipaddr_copy(&c->ripaddr, toaddr);
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c->rport = toport;
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uip_udp_packet_send(c, data, len);
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/* Restore old IP addr/port */
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uip_ipaddr_copy(&c->ripaddr, &curaddr);
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c->rport = curport;
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}
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}
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/*---------------------------------------------------------------------------*/
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