commit a4a41b9023ef5b3a7c4a1cd82fb167fc63e706df Author: goldsimon <goldsimon@gmx.de> Date: Wed Sep 26 21:50:42 2012 +0200 - This also brings in LwIP's IPv6 codebase Signed-off-by: Tomas Hruby <tom@minix3.org>
1151 lines
37 KiB
C
1151 lines
37 KiB
C
/**
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* @file
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* User Datagram Protocol module
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*
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*/
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/*
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* Copyright (c) 2001-2004 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 modification,
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* 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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* 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF 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) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/* udp.c
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*
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* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
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*
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*/
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/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
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*/
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#include "lwip/opt.h"
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#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/udp.h"
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#include "lwip/def.h"
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#include "lwip/memp.h"
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#include "lwip/inet_chksum.h"
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#include "lwip/ip_addr.h"
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#include "lwip/ip6.h"
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#include "lwip/ip6_addr.h"
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#include "lwip/inet_chksum.h"
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#include "lwip/netif.h"
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#include "lwip/icmp.h"
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#include "lwip/icmp6.h"
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#include "lwip/stats.h"
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#include "lwip/snmp.h"
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#include "arch/perf.h"
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#include "lwip/dhcp.h"
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#include <string.h>
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#ifndef UDP_LOCAL_PORT_RANGE_START
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/* From http://www.iana.org/assignments/port-numbers:
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"The Dynamic and/or Private Ports are those from 49152 through 65535" */
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#define UDP_LOCAL_PORT_RANGE_START 0xc000
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#define UDP_LOCAL_PORT_RANGE_END 0xffff
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#define UDP_ENSURE_LOCAL_PORT_RANGE(port) (((port) & ~UDP_LOCAL_PORT_RANGE_START) + UDP_LOCAL_PORT_RANGE_START)
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#endif
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/* last local UDP port */
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static u16_t udp_port = UDP_LOCAL_PORT_RANGE_START;
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/* The list of UDP PCBs */
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/* exported in udp.h (was static) */
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struct udp_pcb *udp_pcbs;
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/**
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* Initialize this module.
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*/
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void
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udp_init(void)
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{
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#if LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND)
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udp_port = UDP_ENSURE_LOCAL_PORT_RANGE(LWIP_RAND());
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#endif /* LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND) */
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}
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/**
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* Allocate a new local UDP port.
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*
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* @return a new (free) local UDP port number
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*/
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static u16_t
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udp_new_port(void)
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{
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u16_t n = 0;
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struct udp_pcb *pcb;
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again:
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if (udp_port++ == UDP_LOCAL_PORT_RANGE_END) {
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udp_port = UDP_LOCAL_PORT_RANGE_START;
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}
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/* Check all PCBs. */
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for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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if (pcb->local_port == udp_port) {
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if (++n > (UDP_LOCAL_PORT_RANGE_END - UDP_LOCAL_PORT_RANGE_START)) {
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return 0;
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}
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goto again;
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}
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}
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return udp_port;
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#if 0
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struct udp_pcb *ipcb = udp_pcbs;
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while ((ipcb != NULL) && (udp_port != UDP_LOCAL_PORT_RANGE_END)) {
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if (ipcb->local_port == udp_port) {
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/* port is already used by another udp_pcb */
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udp_port++;
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/* restart scanning all udp pcbs */
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ipcb = udp_pcbs;
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} else {
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/* go on with next udp pcb */
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ipcb = ipcb->next;
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}
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}
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if (ipcb != NULL) {
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return 0;
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}
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return udp_port;
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#endif
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}
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/**
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* Process an incoming UDP datagram.
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*
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* Given an incoming UDP datagram (as a chain of pbufs) this function
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* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
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* recv function. If no pcb is found or the datagram is incorrect, the
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* pbuf is freed.
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*
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* @param p pbuf to be demultiplexed to a UDP PCB (p->payload pointing to the UDP header)
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* @param inp network interface on which the datagram was received.
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*
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*/
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void
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udp_input(struct pbuf *p, struct netif *inp)
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{
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struct udp_hdr *udphdr;
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struct udp_pcb *pcb, *prev;
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struct udp_pcb *uncon_pcb;
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u16_t src, dest;
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u8_t local_match;
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u8_t broadcast;
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u8_t for_us;
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PERF_START;
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UDP_STATS_INC(udp.recv);
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/* Check minimum length (UDP header) */
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if (p->len < UDP_HLEN) {
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/* drop short packets */
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LWIP_DEBUGF(UDP_DEBUG,
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("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
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UDP_STATS_INC(udp.lenerr);
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UDP_STATS_INC(udp.drop);
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snmp_inc_udpinerrors();
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pbuf_free(p);
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goto end;
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}
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udphdr = (struct udp_hdr *)p->payload;
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/* is broadcast packet ? */
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#if LWIP_IPV6
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broadcast = !ip_current_is_v6() && ip_addr_isbroadcast(ip_current_dest_addr(), inp);
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#else /* LWIP_IPV6 */
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broadcast = ip_addr_isbroadcast(ip_current_dest_addr(), inp);
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#endif /* LWIP_IPV6 */
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LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
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/* convert src and dest ports to host byte order */
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src = ntohs(udphdr->src);
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dest = ntohs(udphdr->dest);
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udp_debug_print(udphdr);
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/* print the UDP source and destination */
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LWIP_DEBUGF(UDP_DEBUG, ("udp ("));
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ipX_addr_debug_print(ip_current_is_v6(), UDP_DEBUG, ipX_current_dest_addr());
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LWIP_DEBUGF(UDP_DEBUG, (", %"U16_F") <-- (", ntohs(udphdr->dest)));
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ipX_addr_debug_print(ip_current_is_v6(), UDP_DEBUG, ipX_current_src_addr());
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LWIP_DEBUGF(UDP_DEBUG, (", %"U16_F")\n", ntohs(udphdr->src)));
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#if LWIP_DHCP
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pcb = NULL;
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/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
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the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
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if (dest == DHCP_CLIENT_PORT) {
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/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
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if (src == DHCP_SERVER_PORT) {
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if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
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/* accept the packe if
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(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
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- inp->dhcp->pcb->remote == ANY or iphdr->src
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(no need to check for IPv6 since the dhcp struct always uses IPv4) */
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if (ipX_addr_isany(0, &inp->dhcp->pcb->remote_ip) ||
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ip_addr_cmp(ipX_2_ip(&(inp->dhcp->pcb->remote_ip)), ip_current_src_addr())) {
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pcb = inp->dhcp->pcb;
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}
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}
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}
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} else
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#endif /* LWIP_DHCP */
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{
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prev = NULL;
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local_match = 0;
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uncon_pcb = NULL;
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/* Iterate through the UDP pcb list for a matching pcb.
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* 'Perfect match' pcbs (connected to the remote port & ip address) are
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* preferred. If no perfect match is found, the first unconnected pcb that
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* matches the local port and ip address gets the datagram. */
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for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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local_match = 0;
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/* print the PCB local and remote address */
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LWIP_DEBUGF(UDP_DEBUG, ("pcb ("));
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ipX_addr_debug_print(PCB_ISIPV6(pcb), UDP_DEBUG, &pcb->local_ip);
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LWIP_DEBUGF(UDP_DEBUG, (", %"U16_F") <-- (", pcb->local_port));
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ipX_addr_debug_print(PCB_ISIPV6(pcb), UDP_DEBUG, &pcb->remote_ip);
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LWIP_DEBUGF(UDP_DEBUG, (", %"U16_F")\n", pcb->remote_port));
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/* compare PCB local addr+port to UDP destination addr+port */
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if (pcb->local_port == dest) {
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if (
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#if LWIP_IPV6
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((PCB_ISIPV6(pcb) && (ip_current_is_v6()) &&
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(ip6_addr_isany(ipX_2_ip6(&pcb->local_ip)) ||
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#if LWIP_IPV6_MLD
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ip6_addr_ismulticast(ip6_current_dest_addr()) ||
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#endif /* LWIP_IPV6_MLD */
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ip6_addr_cmp(ipX_2_ip6(&pcb->local_ip), ip6_current_dest_addr()))) ||
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(!PCB_ISIPV6(pcb) &&
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(ip_current_header() != NULL) &&
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#else /* LWIP_IPV6 */
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((
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#endif /* LWIP_IPV6 */
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((!broadcast && ipX_addr_isany(0, &pcb->local_ip)) ||
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ip_addr_cmp(ipX_2_ip(&pcb->local_ip), ip_current_dest_addr()) ||
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#if LWIP_IGMP
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ip_addr_ismulticast(ip_current_dest_addr()) ||
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#endif /* LWIP_IGMP */
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#if IP_SOF_BROADCAST_RECV
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(broadcast && ip_get_option(pcb, SOF_BROADCAST) &&
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(ipX_addr_isany(0, &pcb->local_ip) ||
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ip_addr_netcmp(ipX_2_ip(&pcb->local_ip), ip_current_dest_addr(), &inp->netmask))))))) {
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#else /* IP_SOF_BROADCAST_RECV */
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(broadcast &&
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(ipX_addr_isany(0, &pcb->local_ip) ||
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ip_addr_netcmp(ipX_2_ip(&pcb->local_ip), ip_current_dest_addr(), &inp->netmask))))))) {
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#endif /* IP_SOF_BROADCAST_RECV */
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local_match = 1;
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if ((uncon_pcb == NULL) &&
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((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
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/* the first unconnected matching PCB */
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uncon_pcb = pcb;
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}
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}
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}
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/* compare PCB remote addr+port to UDP source addr+port */
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if ((local_match != 0) &&
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(pcb->remote_port == src) && IP_PCB_IPVER_INPUT_MATCH(pcb) &&
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(ipX_addr_isany(PCB_ISIPV6(pcb), &pcb->remote_ip) ||
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ipX_addr_cmp(PCB_ISIPV6(pcb), &pcb->remote_ip, ipX_current_src_addr()))) {
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/* the first fully matching PCB */
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if (prev != NULL) {
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/* move the pcb to the front of udp_pcbs so that is
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found faster next time */
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prev->next = pcb->next;
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pcb->next = udp_pcbs;
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udp_pcbs = pcb;
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} else {
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UDP_STATS_INC(udp.cachehit);
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}
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break;
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}
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prev = pcb;
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}
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/* no fully matching pcb found? then look for an unconnected pcb */
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if (pcb == NULL) {
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pcb = uncon_pcb;
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}
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}
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/* Check checksum if this is a match or if it was directed at us. */
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if (pcb != NULL) {
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for_us = 1;
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} else {
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#if LWIP_IPV6
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if (ip_current_is_v6()) {
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for_us = netif_matches_ip6_addr(inp, ip6_current_dest_addr());
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} else
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#endif /* LWIP_IPV6 */
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{
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for_us = ip_addr_cmp(&inp->ip_addr, ip_current_dest_addr());
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}
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}
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if (for_us) {
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LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
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#if CHECKSUM_CHECK_UDP
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#if LWIP_UDPLITE
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if (ip_current_header_proto() == IP_PROTO_UDPLITE) {
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/* Do the UDP Lite checksum */
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u16_t chklen = ntohs(udphdr->len);
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if (chklen < sizeof(struct udp_hdr)) {
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if (chklen == 0) {
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/* For UDP-Lite, checksum length of 0 means checksum
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over the complete packet (See RFC 3828 chap. 3.1) */
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chklen = p->tot_len;
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} else {
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/* At least the UDP-Lite header must be covered by the
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checksum! (Again, see RFC 3828 chap. 3.1) */
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goto chkerr;
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}
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}
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if (ipX_chksum_pseudo_partial(ip_current_is_v6(), p, IP_PROTO_UDPLITE,
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p->tot_len, chklen,
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ipX_current_src_addr(), ipX_current_dest_addr()) != 0) {
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goto chkerr;
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}
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} else
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#endif /* LWIP_UDPLITE */
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{
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if (udphdr->chksum != 0) {
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if (ipX_chksum_pseudo(ip_current_is_v6(), p, IP_PROTO_UDP, p->tot_len,
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ipX_current_src_addr(),
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ipX_current_dest_addr()) != 0) {
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goto chkerr;
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}
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}
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}
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#endif /* CHECKSUM_CHECK_UDP */
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if(pbuf_header(p, -UDP_HLEN)) {
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/* Can we cope with this failing? Just assert for now */
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LWIP_ASSERT("pbuf_header failed\n", 0);
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UDP_STATS_INC(udp.drop);
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snmp_inc_udpinerrors();
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pbuf_free(p);
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goto end;
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}
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if (pcb != NULL) {
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snmp_inc_udpindatagrams();
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#if SO_REUSE && SO_REUSE_RXTOALL
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if ((broadcast ||
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#if LWIP_IPV6
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ip6_addr_ismulticast(ip6_current_dest_addr()) ||
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#endif /* LWIP_IPV6 */
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ip_addr_ismulticast(ip_current_dest_addr())) &&
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ip_get_option(pcb, SOF_REUSEADDR)) {
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/* pass broadcast- or multicast packets to all multicast pcbs
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if SOF_REUSEADDR is set on the first match */
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struct udp_pcb *mpcb;
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u8_t p_header_changed = 0;
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s16_t hdrs_len = (s16_t)(ip_current_header_tot_len() + UDP_HLEN);
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for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
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if (mpcb != pcb) {
|
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/* compare PCB local addr+port to UDP destination addr+port */
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if ((mpcb->local_port == dest) &&
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#if LWIP_IPV6
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((PCB_ISIPV6(mpcb) &&
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(ip6_addr_ismulticast(ip6_current_dest_addr()) ||
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ip6_addr_cmp(ipX_2_ip6(&mpcb->local_ip), ip6_current_dest_addr()))) ||
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(!PCB_ISIPV6(mpcb) &&
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#else /* LWIP_IPV6 */
|
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((
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#endif /* LWIP_IPV6 */
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((!broadcast && ipX_addr_isany(0, &mpcb->local_ip)) ||
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ip_addr_cmp(ipX_2_ip(&mpcb->local_ip), ip_current_dest_addr()) ||
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#if LWIP_IGMP
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ip_addr_ismulticast(ip_current_dest_addr()) ||
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#endif /* LWIP_IGMP */
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#if IP_SOF_BROADCAST_RECV
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(broadcast && ip_get_option(mpcb, SOF_BROADCAST)))))) {
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#else /* IP_SOF_BROADCAST_RECV */
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(broadcast))))) {
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#endif /* IP_SOF_BROADCAST_RECV */
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/* pass a copy of the packet to all local matches */
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if (mpcb->recv.ip4 != NULL) {
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struct pbuf *q;
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/* for that, move payload to IP header again */
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if (p_header_changed == 0) {
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pbuf_header(p, hdrs_len);
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p_header_changed = 1;
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}
|
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q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
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if (q != NULL) {
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err_t err = pbuf_copy(q, p);
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if (err == ERR_OK) {
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/* move payload to UDP data */
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pbuf_header(q, -hdrs_len);
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#if LWIP_IPV6
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if (PCB_ISIPV6(mpcb)) {
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mpcb->recv.ip6(mpcb->recv_arg, mpcb, q, ip6_current_src_addr(), src);
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}
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else
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#endif /* LWIP_IPV6 */
|
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{
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mpcb->recv.ip4(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
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}
|
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}
|
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}
|
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}
|
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}
|
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}
|
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}
|
|
if (p_header_changed) {
|
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/* and move payload to UDP data again */
|
|
pbuf_header(p, -hdrs_len);
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}
|
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}
|
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#endif /* SO_REUSE && SO_REUSE_RXTOALL */
|
|
/* callback */
|
|
if (pcb->recv.ip4 != NULL) {
|
|
/* now the recv function is responsible for freeing p */
|
|
#if LWIP_IPV6
|
|
if (PCB_ISIPV6(pcb)) {
|
|
pcb->recv.ip6(pcb->recv_arg, pcb, p, ip6_current_src_addr(), src);
|
|
}
|
|
else
|
|
#endif /* LWIP_IPV6 */
|
|
{
|
|
pcb->recv.ip4(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
|
|
}
|
|
} else {
|
|
/* no recv function registered? then we have to free the pbuf! */
|
|
pbuf_free(p);
|
|
goto end;
|
|
}
|
|
} else {
|
|
LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
|
|
|
|
#if LWIP_ICMP || LWIP_ICMP6
|
|
/* No match was found, send ICMP destination port unreachable unless
|
|
destination address was broadcast/multicast. */
|
|
if (!broadcast &&
|
|
#if LWIP_IPV6
|
|
!ip6_addr_ismulticast(ip6_current_dest_addr()) &&
|
|
#endif /* LWIP_IPV6 */
|
|
!ip_addr_ismulticast(ip_current_dest_addr())) {
|
|
/* move payload pointer back to ip header */
|
|
pbuf_header(p, ip_current_header_tot_len() + UDP_HLEN);
|
|
icmp_port_unreach(ip_current_is_v6(), p);
|
|
}
|
|
#endif /* LWIP_ICMP || LWIP_ICMP6 */
|
|
UDP_STATS_INC(udp.proterr);
|
|
UDP_STATS_INC(udp.drop);
|
|
snmp_inc_udpnoports();
|
|
pbuf_free(p);
|
|
}
|
|
} else {
|
|
pbuf_free(p);
|
|
}
|
|
end:
|
|
PERF_STOP("udp_input");
|
|
return;
|
|
#if CHECKSUM_CHECK_UDP
|
|
chkerr:
|
|
LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
|
("udp_input: UDP (or UDP Lite) datagram discarded due to failing checksum\n"));
|
|
UDP_STATS_INC(udp.chkerr);
|
|
UDP_STATS_INC(udp.drop);
|
|
snmp_inc_udpinerrors();
|
|
pbuf_free(p);
|
|
PERF_STOP("udp_input");
|
|
#endif /* CHECKSUM_CHECK_UDP */
|
|
}
|
|
|
|
/**
|
|
* Send data using UDP.
|
|
*
|
|
* @param pcb UDP PCB used to send the data.
|
|
* @param p chain of pbuf's to be sent.
|
|
*
|
|
* The datagram will be sent to the current remote_ip & remote_port
|
|
* stored in pcb. If the pcb is not bound to a port, it will
|
|
* automatically be bound to a random port.
|
|
*
|
|
* @return lwIP error code.
|
|
* - ERR_OK. Successful. No error occured.
|
|
* - ERR_MEM. Out of memory.
|
|
* - ERR_RTE. Could not find route to destination address.
|
|
* - More errors could be returned by lower protocol layers.
|
|
*
|
|
* @see udp_disconnect() udp_sendto()
|
|
*/
|
|
err_t
|
|
udp_send(struct udp_pcb *pcb, struct pbuf *p)
|
|
{
|
|
/* send to the packet using remote ip and port stored in the pcb */
|
|
return udp_sendto(pcb, p, ipX_2_ip(&pcb->remote_ip), pcb->remote_port);
|
|
}
|
|
|
|
#if LWIP_CHECKSUM_ON_COPY
|
|
/** Same as udp_send() but with checksum
|
|
*/
|
|
err_t
|
|
udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
|
|
u8_t have_chksum, u16_t chksum)
|
|
{
|
|
/* send to the packet using remote ip and port stored in the pcb */
|
|
return udp_sendto_chksum(pcb, p, ipX_2_ip(&pcb->remote_ip), pcb->remote_port,
|
|
have_chksum, chksum);
|
|
}
|
|
#endif /* LWIP_CHECKSUM_ON_COPY */
|
|
|
|
/**
|
|
* Send data to a specified address using UDP.
|
|
*
|
|
* @param pcb UDP PCB used to send the data.
|
|
* @param p chain of pbuf's to be sent.
|
|
* @param dst_ip Destination IP address.
|
|
* @param dst_port Destination UDP port.
|
|
*
|
|
* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
|
|
*
|
|
* If the PCB already has a remote address association, it will
|
|
* be restored after the data is sent.
|
|
*
|
|
* @return lwIP error code (@see udp_send for possible error codes)
|
|
*
|
|
* @see udp_disconnect() udp_send()
|
|
*/
|
|
err_t
|
|
udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
|
|
ip_addr_t *dst_ip, u16_t dst_port)
|
|
{
|
|
#if LWIP_CHECKSUM_ON_COPY
|
|
return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
|
|
}
|
|
|
|
/** Same as udp_sendto(), but with checksum */
|
|
err_t
|
|
udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
|
|
u16_t dst_port, u8_t have_chksum, u16_t chksum)
|
|
{
|
|
#endif /* LWIP_CHECKSUM_ON_COPY */
|
|
struct netif *netif;
|
|
ipX_addr_t *dst_ip_route = ip_2_ipX(dst_ip);
|
|
|
|
LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
|
|
|
|
#if LWIP_IPV6 || LWIP_IGMP
|
|
if (ipX_addr_ismulticast(PCB_ISIPV6(pcb), dst_ip_route)) {
|
|
/* For multicast, find a netif based on source address. */
|
|
#if LWIP_IPV6
|
|
if (PCB_ISIPV6(pcb)) {
|
|
dst_ip_route = &pcb->local_ip;
|
|
} else
|
|
#endif /* LWIP_IPV6 */
|
|
{
|
|
#if LWIP_IGMP
|
|
dst_ip_route = ip_2_ipX(&pcb->multicast_ip);
|
|
#endif /* LWIP_IGMP */
|
|
}
|
|
}
|
|
#endif /* LWIP_IPV6 || LWIP_IGMP */
|
|
|
|
/* find the outgoing network interface for this packet */
|
|
netif = ipX_route(PCB_ISIPV6(pcb), &pcb->local_ip, dst_ip_route);
|
|
|
|
/* no outgoing network interface could be found? */
|
|
if (netif == NULL) {
|
|
LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to "));
|
|
ipX_addr_debug_print(PCB_ISIPV6(pcb), UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ip_2_ipX(dst_ip));
|
|
LWIP_DEBUGF(UDP_DEBUG, ("\n"));
|
|
UDP_STATS_INC(udp.rterr);
|
|
return ERR_RTE;
|
|
}
|
|
#if LWIP_CHECKSUM_ON_COPY
|
|
return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
|
|
#else /* LWIP_CHECKSUM_ON_COPY */
|
|
return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
|
|
#endif /* LWIP_CHECKSUM_ON_COPY */
|
|
}
|
|
|
|
/**
|
|
* Send data to a specified address using UDP.
|
|
* The netif used for sending can be specified.
|
|
*
|
|
* This function exists mainly for DHCP, to be able to send UDP packets
|
|
* on a netif that is still down.
|
|
*
|
|
* @param pcb UDP PCB used to send the data.
|
|
* @param p chain of pbuf's to be sent.
|
|
* @param dst_ip Destination IP address.
|
|
* @param dst_port Destination UDP port.
|
|
* @param netif the netif used for sending.
|
|
*
|
|
* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
|
|
*
|
|
* @return lwIP error code (@see udp_send for possible error codes)
|
|
*
|
|
* @see udp_disconnect() udp_send()
|
|
*/
|
|
err_t
|
|
udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
|
|
ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
|
|
{
|
|
#if LWIP_CHECKSUM_ON_COPY
|
|
return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
|
|
}
|
|
|
|
/** Same as udp_sendto_if(), but with checksum */
|
|
err_t
|
|
udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
|
|
u16_t dst_port, struct netif *netif, u8_t have_chksum,
|
|
u16_t chksum)
|
|
{
|
|
#endif /* LWIP_CHECKSUM_ON_COPY */
|
|
struct udp_hdr *udphdr;
|
|
ip_addr_t *src_ip;
|
|
err_t err;
|
|
struct pbuf *q; /* q will be sent down the stack */
|
|
u8_t ip_proto;
|
|
|
|
#if IP_SOF_BROADCAST
|
|
/* broadcast filter? */
|
|
if (!ip_get_option(pcb, SOF_BROADCAST) &&
|
|
#if LWIP_IPV6
|
|
!PCB_ISIPV6(pcb) &&
|
|
#endif /* LWIP_IPV6 */
|
|
ip_addr_isbroadcast(dst_ip, netif) ) {
|
|
LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
|
("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
|
|
return ERR_VAL;
|
|
}
|
|
#endif /* IP_SOF_BROADCAST */
|
|
|
|
/* if the PCB is not yet bound to a port, bind it here */
|
|
if (pcb->local_port == 0) {
|
|
LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
|
|
err = udp_bind(pcb, ipX_2_ip(&pcb->local_ip), pcb->local_port);
|
|
if (err != ERR_OK) {
|
|
LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
|
|
return err;
|
|
}
|
|
}
|
|
|
|
/* not enough space to add an UDP header to first pbuf in given p chain? */
|
|
if (pbuf_header(p, UDP_HLEN)) {
|
|
/* allocate header in a separate new pbuf */
|
|
q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
|
|
/* new header pbuf could not be allocated? */
|
|
if (q == NULL) {
|
|
LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
|
|
return ERR_MEM;
|
|
}
|
|
if (p->tot_len != 0) {
|
|
/* chain header q in front of given pbuf p (only if p contains data) */
|
|
pbuf_chain(q, p);
|
|
}
|
|
/* first pbuf q points to header pbuf */
|
|
LWIP_DEBUGF(UDP_DEBUG,
|
|
("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
|
|
} else {
|
|
/* adding space for header within p succeeded */
|
|
/* first pbuf q equals given pbuf */
|
|
q = p;
|
|
LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
|
|
}
|
|
LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
|
|
(q->len >= sizeof(struct udp_hdr)));
|
|
/* q now represents the packet to be sent */
|
|
udphdr = (struct udp_hdr *)q->payload;
|
|
udphdr->src = htons(pcb->local_port);
|
|
udphdr->dest = htons(dst_port);
|
|
/* in UDP, 0 checksum means 'no checksum' */
|
|
udphdr->chksum = 0x0000;
|
|
|
|
/* Multicast Loop? */
|
|
#if LWIP_IGMP
|
|
if (((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0) &&
|
|
#if LWIP_IPV6
|
|
(
|
|
#if LWIP_IPV6_MLD
|
|
(PCB_ISIPV6(pcb) &&
|
|
ip6_addr_ismulticast(ip_2_ip6(dst_ip))) ||
|
|
#endif /* LWIP_IPV6_MLD */
|
|
(!PCB_ISIPV6(pcb) &&
|
|
#else /* LWIP_IPV6 */
|
|
((
|
|
#endif /* LWIP_IPV6 */
|
|
ip_addr_ismulticast(dst_ip)))) {
|
|
q->flags |= PBUF_FLAG_MCASTLOOP;
|
|
}
|
|
#endif /* LWIP_IGMP */
|
|
|
|
|
|
/* PCB local address is IP_ANY_ADDR? */
|
|
#if LWIP_IPV6
|
|
if (PCB_ISIPV6(pcb)) {
|
|
if (ip6_addr_isany(ipX_2_ip6(&pcb->local_ip))) {
|
|
src_ip = ip6_2_ip(ip6_select_source_address(netif, ip_2_ip6(dst_ip)));
|
|
if (src_ip == NULL) {
|
|
/* No suitable source address was found. */
|
|
if (q != p) {
|
|
/* free the header pbuf */
|
|
pbuf_free(q);
|
|
/* p is still referenced by the caller, and will live on */
|
|
}
|
|
return ERR_RTE;
|
|
}
|
|
} else {
|
|
/* use UDP PCB local IPv6 address as source address, if still valid. */
|
|
if (netif_matches_ip6_addr(netif, ipX_2_ip6(&pcb->local_ip)) < 0) {
|
|
/* Address isn't valid anymore. */
|
|
if (q != p) {
|
|
/* free the header pbuf */
|
|
pbuf_free(q);
|
|
/* p is still referenced by the caller, and will live on */
|
|
}
|
|
return ERR_RTE;
|
|
}
|
|
src_ip = ipX_2_ip(&pcb->local_ip);
|
|
}
|
|
}
|
|
else
|
|
#endif /* LWIP_IPV6 */
|
|
if (ip_addr_isany(ipX_2_ip(&pcb->local_ip))) {
|
|
/* use outgoing network interface IP address as source address */
|
|
src_ip = &(netif->ip_addr);
|
|
} else {
|
|
/* check if UDP PCB local IP address is correct
|
|
* this could be an old address if netif->ip_addr has changed */
|
|
if (!ip_addr_cmp(ipX_2_ip(&(pcb->local_ip)), &(netif->ip_addr))) {
|
|
/* local_ip doesn't match, drop the packet */
|
|
if (q != p) {
|
|
/* free the header pbuf */
|
|
pbuf_free(q);
|
|
q = NULL;
|
|
/* p is still referenced by the caller, and will live on */
|
|
}
|
|
return ERR_VAL;
|
|
}
|
|
/* use UDP PCB local IP address as source address */
|
|
src_ip = ipX_2_ip(&(pcb->local_ip));
|
|
}
|
|
|
|
LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
|
|
|
|
#if LWIP_UDPLITE
|
|
/* UDP Lite protocol? */
|
|
if (pcb->flags & UDP_FLAGS_UDPLITE) {
|
|
u16_t chklen, chklen_hdr;
|
|
LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
|
|
/* set UDP message length in UDP header */
|
|
chklen_hdr = chklen = pcb->chksum_len_tx;
|
|
if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
|
|
if (chklen != 0) {
|
|
LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
|
|
}
|
|
/* For UDP-Lite, checksum length of 0 means checksum
|
|
over the complete packet. (See RFC 3828 chap. 3.1)
|
|
At least the UDP-Lite header must be covered by the
|
|
checksum, therefore, if chksum_len has an illegal
|
|
value, we generate the checksum over the complete
|
|
packet to be safe. */
|
|
chklen_hdr = 0;
|
|
chklen = q->tot_len;
|
|
}
|
|
udphdr->len = htons(chklen_hdr);
|
|
/* calculate checksum */
|
|
#if CHECKSUM_GEN_UDP
|
|
#if LWIP_CHECKSUM_ON_COPY
|
|
if (have_chksum) {
|
|
chklen = UDP_HLEN;
|
|
}
|
|
#endif /* LWIP_CHECKSUM_ON_COPY */
|
|
udphdr->chksum = ipX_chksum_pseudo_partial(PCB_ISIPV6(pcb), q, IP_PROTO_UDPLITE,
|
|
q->tot_len, chklen, ip_2_ipX(src_ip), ip_2_ipX(dst_ip));
|
|
#if LWIP_CHECKSUM_ON_COPY
|
|
if (have_chksum) {
|
|
u32_t acc;
|
|
acc = udphdr->chksum + (u16_t)~(chksum);
|
|
udphdr->chksum = FOLD_U32T(acc);
|
|
}
|
|
#endif /* LWIP_CHECKSUM_ON_COPY */
|
|
|
|
/* chksum zero must become 0xffff, as zero means 'no checksum' */
|
|
if (udphdr->chksum == 0x0000) {
|
|
udphdr->chksum = 0xffff;
|
|
}
|
|
#endif /* CHECKSUM_GEN_UDP */
|
|
|
|
ip_proto = IP_PROTO_UDPLITE;
|
|
} else
|
|
#endif /* LWIP_UDPLITE */
|
|
{ /* UDP */
|
|
LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
|
|
udphdr->len = htons(q->tot_len);
|
|
/* calculate checksum */
|
|
#if CHECKSUM_GEN_UDP
|
|
/* Checksum is mandatory over IPv6. */
|
|
if (PCB_ISIPV6(pcb) || (pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
|
|
u16_t udpchksum;
|
|
#if LWIP_CHECKSUM_ON_COPY
|
|
if (have_chksum) {
|
|
u32_t acc;
|
|
udpchksum = ipX_chksum_pseudo_partial(PCB_ISIPV6(pcb), q, IP_PROTO_UDP,
|
|
q->tot_len, UDP_HLEN, ip_2_ipX(src_ip), ip_2_ipX(dst_ip));
|
|
acc = udpchksum + (u16_t)~(chksum);
|
|
udpchksum = FOLD_U32T(acc);
|
|
} else
|
|
#endif /* LWIP_CHECKSUM_ON_COPY */
|
|
{
|
|
udpchksum = ipX_chksum_pseudo(PCB_ISIPV6(pcb), q, IP_PROTO_UDP, q->tot_len,
|
|
ip_2_ipX(src_ip), ip_2_ipX(dst_ip));
|
|
}
|
|
|
|
/* chksum zero must become 0xffff, as zero means 'no checksum' */
|
|
if (udpchksum == 0x0000) {
|
|
udpchksum = 0xffff;
|
|
}
|
|
udphdr->chksum = udpchksum;
|
|
}
|
|
#endif /* CHECKSUM_GEN_UDP */
|
|
ip_proto = IP_PROTO_UDP;
|
|
}
|
|
|
|
LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
|
|
LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,0x%02"X16_F",)\n", (u16_t)ip_proto));
|
|
/* output to IP */
|
|
NETIF_SET_HWADDRHINT(netif, &(pcb->addr_hint));
|
|
err = ipX_output_if(PCB_ISIPV6(pcb), q, src_ip, dst_ip, pcb->ttl, pcb->tos, ip_proto, netif);
|
|
NETIF_SET_HWADDRHINT(netif, NULL);
|
|
|
|
/* TODO: must this be increased even if error occured? */
|
|
snmp_inc_udpoutdatagrams();
|
|
|
|
/* did we chain a separate header pbuf earlier? */
|
|
if (q != p) {
|
|
/* free the header pbuf */
|
|
pbuf_free(q);
|
|
q = NULL;
|
|
/* p is still referenced by the caller, and will live on */
|
|
}
|
|
|
|
UDP_STATS_INC(udp.xmit);
|
|
return err;
|
|
}
|
|
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/**
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* Bind an UDP PCB.
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*
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* @param pcb UDP PCB to be bound with a local address ipaddr and port.
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* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
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* bind to all local interfaces.
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* @param port local UDP port to bind with. Use 0 to automatically bind
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* to a random port between UDP_LOCAL_PORT_RANGE_START and
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* UDP_LOCAL_PORT_RANGE_END.
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*
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* ipaddr & port are expected to be in the same byte order as in the pcb.
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*
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* @return lwIP error code.
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* - ERR_OK. Successful. No error occured.
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* - ERR_USE. The specified ipaddr and port are already bound to by
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* another UDP PCB.
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*
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* @see udp_disconnect()
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*/
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err_t
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udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
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{
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struct udp_pcb *ipcb;
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u8_t rebind;
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LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
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ipX_addr_debug_print(PCB_ISIPV6(pcb), UDP_DEBUG | LWIP_DBG_TRACE, ip_2_ipX(ipaddr));
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LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
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rebind = 0;
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/* Check for double bind and rebind of the same pcb */
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for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
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/* is this UDP PCB already on active list? */
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if (pcb == ipcb) {
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/* pcb may occur at most once in active list */
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LWIP_ASSERT("rebind == 0", rebind == 0);
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/* pcb already in list, just rebind */
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rebind = 1;
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}
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/* By default, we don't allow to bind to a port that any other udp
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PCB is alread bound to, unless *all* PCBs with that port have tha
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REUSEADDR flag set. */
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#if SO_REUSE
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else if (!ip_get_option(pcb, SOF_REUSEADDR) &&
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!ip_get_option(ipcb, SOF_REUSEADDR)) {
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#else /* SO_REUSE */
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/* port matches that of PCB in list and REUSEADDR not set -> reject */
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else {
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#endif /* SO_REUSE */
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if ((ipcb->local_port == port) && IP_PCB_IPVER_EQ(pcb, ipcb) &&
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/* IP address matches, or one is IP_ADDR_ANY? */
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(ipX_addr_isany(PCB_ISIPV6(ipcb), &(ipcb->local_ip)) ||
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ipX_addr_isany(PCB_ISIPV6(ipcb), ip_2_ipX(ipaddr)) ||
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ipX_addr_cmp(PCB_ISIPV6(ipcb), &(ipcb->local_ip), ip_2_ipX(ipaddr)))) {
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/* other PCB already binds to this local IP and port */
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LWIP_DEBUGF(UDP_DEBUG,
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("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
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return ERR_USE;
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}
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}
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}
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ipX_addr_set_ipaddr(PCB_ISIPV6(pcb), &pcb->local_ip, ipaddr);
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/* no port specified? */
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if (port == 0) {
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port = udp_new_port();
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if (port == 0) {
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/* no more ports available in local range */
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LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
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return ERR_USE;
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}
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}
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pcb->local_port = port;
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snmp_insert_udpidx_tree(pcb);
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/* pcb not active yet? */
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if (rebind == 0) {
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/* place the PCB on the active list if not already there */
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pcb->next = udp_pcbs;
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udp_pcbs = pcb;
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}
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LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("udp_bind: bound to "));
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ipX_addr_debug_print(PCB_ISIPV6(pcb), UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, &pcb->local_ip);
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LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, (", port %"U16_F")\n", pcb->local_port));
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return ERR_OK;
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}
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/**
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* Connect an UDP PCB.
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*
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* This will associate the UDP PCB with the remote address.
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*
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* @param pcb UDP PCB to be connected with remote address ipaddr and port.
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* @param ipaddr remote IP address to connect with.
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* @param port remote UDP port to connect with.
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*
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* @return lwIP error code
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*
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* ipaddr & port are expected to be in the same byte order as in the pcb.
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*
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* The udp pcb is bound to a random local port if not already bound.
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*
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* @see udp_disconnect()
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*/
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err_t
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udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
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{
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struct udp_pcb *ipcb;
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if (pcb->local_port == 0) {
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err_t err = udp_bind(pcb, ipX_2_ip(&pcb->local_ip), pcb->local_port);
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if (err != ERR_OK) {
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return err;
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}
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}
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ipX_addr_set_ipaddr(PCB_ISIPV6(pcb), &pcb->remote_ip, ipaddr);
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pcb->remote_port = port;
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pcb->flags |= UDP_FLAGS_CONNECTED;
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/** TODO: this functionality belongs in upper layers */
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#ifdef LWIP_UDP_TODO
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#if LWIP_IPV6
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if (!PCB_ISIPV6(pcb))
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#endif /* LWIP_IPV6 */
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{
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/* Nail down local IP for netconn_addr()/getsockname() */
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if (ip_addr_isany(ipX_2_ip(&pcb->local_ip)) && !ip_addr_isany(ipX_2_ip(&pcb->remote_ip))) {
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struct netif *netif;
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if ((netif = ip_route(ipX_2_ip(&pcb->remote_ip))) == NULL) {
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LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n",
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ip4_addr_get_u32(ipX_2_ip(&pcb->remote_ip))));
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UDP_STATS_INC(udp.rterr);
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return ERR_RTE;
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}
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/** TODO: this will bind the udp pcb locally, to the interface which
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is used to route output packets to the remote address. However, we
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might want to accept incoming packets on any interface! */
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ipX_addr_copy(0, pcb->local_ip, netif->ip_addr);
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} else if (ip_addr_isany(ipX_2_ip(&pcb->remote_ip))) {
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ipX_addr_set_any(0, &pcb->local_ip);
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}
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}
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#endif
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LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("udp_connect: connected to "));
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ipX_addr_debug_print(PCB_ISIPV6(pcb), UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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&pcb->remote_ip);
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LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, (", port %"U16_F")\n", pcb->remote_port));
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/* Insert UDP PCB into the list of active UDP PCBs. */
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for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
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if (pcb == ipcb) {
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/* already on the list, just return */
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return ERR_OK;
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}
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}
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/* PCB not yet on the list, add PCB now */
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pcb->next = udp_pcbs;
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udp_pcbs = pcb;
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return ERR_OK;
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}
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/**
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* Disconnect a UDP PCB
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*
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* @param pcb the udp pcb to disconnect.
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*/
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void
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udp_disconnect(struct udp_pcb *pcb)
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{
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/* reset remote address association */
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ipX_addr_set_any(PCB_ISIPV6(pcb), &pcb->remote_ip);
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pcb->remote_port = 0;
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/* mark PCB as unconnected */
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pcb->flags &= ~UDP_FLAGS_CONNECTED;
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}
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/**
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* Set a receive callback for a UDP PCB
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*
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* This callback will be called when receiving a datagram for the pcb.
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*
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* @param pcb the pcb for wich to set the recv callback
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* @param recv function pointer of the callback function
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* @param recv_arg additional argument to pass to the callback function
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*/
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void
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udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
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{
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/* remember recv() callback and user data */
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pcb->recv.ip4 = recv;
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pcb->recv_arg = recv_arg;
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}
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|
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/**
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* Remove an UDP PCB.
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*
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* @param pcb UDP PCB to be removed. The PCB is removed from the list of
|
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* UDP PCB's and the data structure is freed from memory.
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*
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* @see udp_new()
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*/
|
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void
|
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udp_remove(struct udp_pcb *pcb)
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{
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struct udp_pcb *pcb2;
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snmp_delete_udpidx_tree(pcb);
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/* pcb to be removed is first in list? */
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if (udp_pcbs == pcb) {
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/* make list start at 2nd pcb */
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udp_pcbs = udp_pcbs->next;
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/* pcb not 1st in list */
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} else {
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for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
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/* find pcb in udp_pcbs list */
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if (pcb2->next != NULL && pcb2->next == pcb) {
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/* remove pcb from list */
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pcb2->next = pcb->next;
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}
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}
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}
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memp_free(MEMP_UDP_PCB, pcb);
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}
|
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|
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/**
|
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* Create a UDP PCB.
|
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*
|
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* @return The UDP PCB which was created. NULL if the PCB data structure
|
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* could not be allocated.
|
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*
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* @see udp_remove()
|
|
*/
|
|
struct udp_pcb *
|
|
udp_new(void)
|
|
{
|
|
struct udp_pcb *pcb;
|
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pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
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/* could allocate UDP PCB? */
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if (pcb != NULL) {
|
|
/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
|
|
* which means checksum is generated over the whole datagram per default
|
|
* (recommended as default by RFC 3828). */
|
|
/* initialize PCB to all zeroes */
|
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memset(pcb, 0, sizeof(struct udp_pcb));
|
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pcb->ttl = UDP_TTL;
|
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}
|
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return pcb;
|
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}
|
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|
|
#if LWIP_IPV6
|
|
/**
|
|
* Create a UDP PCB for IPv6.
|
|
*
|
|
* @return The UDP PCB which was created. NULL if the PCB data structure
|
|
* could not be allocated.
|
|
*
|
|
* @see udp_remove()
|
|
*/
|
|
struct udp_pcb *
|
|
udp_new_ip6(void)
|
|
{
|
|
struct udp_pcb *pcb;
|
|
pcb = udp_new();
|
|
ip_set_v6(pcb, 1);
|
|
return pcb;
|
|
}
|
|
#endif /* LWIP_IPV6 */
|
|
|
|
#if UDP_DEBUG
|
|
/**
|
|
* Print UDP header information for debug purposes.
|
|
*
|
|
* @param udphdr pointer to the udp header in memory.
|
|
*/
|
|
void
|
|
udp_debug_print(struct udp_hdr *udphdr)
|
|
{
|
|
LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
|
|
LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
|
LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
|
|
ntohs(udphdr->src), ntohs(udphdr->dest)));
|
|
LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
|
LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
|
|
ntohs(udphdr->len), ntohs(udphdr->chksum)));
|
|
LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
|
}
|
|
#endif /* UDP_DEBUG */
|
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|
|
#endif /* LWIP_UDP */
|