Yann Garcia / Mbed 2 deprecated DS130x_I2CApp

This short program illustrates how to use the DS130x_I2C library. My objective is to share the same RTC with Microchip 18F MCU.

Dependencies:   mbed DebugLibrary

NetServices/lwip/core/udp.c@1:995212d326ca, 2011-02-11 (annotated)

Committer:
Yann
Date:
Fri Feb 11 10:17:20 2011 +0000
Revision:
1:995212d326ca
Parent:
0:f30e2135b0db 
V0.0.0.2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Yann 0:f30e2135b0db 1 /**
Yann 0:f30e2135b0db 2 * @file
Yann 0:f30e2135b0db 3 * User Datagram Protocol module
Yann 0:f30e2135b0db 4 *
Yann 0:f30e2135b0db 5 */
Yann 0:f30e2135b0db 6
Yann 0:f30e2135b0db 7 /*
Yann 0:f30e2135b0db 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
Yann 0:f30e2135b0db 9 * All rights reserved.
Yann 0:f30e2135b0db 10 *
Yann 0:f30e2135b0db 11 * Redistribution and use in source and binary forms, with or without modification,
Yann 0:f30e2135b0db 12 * are permitted provided that the following conditions are met:
Yann 0:f30e2135b0db 13 *
Yann 0:f30e2135b0db 14 * 1. Redistributions of source code must retain the above copyright notice,
Yann 0:f30e2135b0db 15 * this list of conditions and the following disclaimer.
Yann 0:f30e2135b0db 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
Yann 0:f30e2135b0db 17 * this list of conditions and the following disclaimer in the documentation
Yann 0:f30e2135b0db 18 * and/or other materials provided with the distribution.
Yann 0:f30e2135b0db 19 * 3. The name of the author may not be used to endorse or promote products
Yann 0:f30e2135b0db 20 * derived from this software without specific prior written permission.
Yann 0:f30e2135b0db 21 *
Yann 0:f30e2135b0db 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
Yann 0:f30e2135b0db 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
Yann 0:f30e2135b0db 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
Yann 0:f30e2135b0db 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Yann 0:f30e2135b0db 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
Yann 0:f30e2135b0db 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Yann 0:f30e2135b0db 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Yann 0:f30e2135b0db 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
Yann 0:f30e2135b0db 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
Yann 0:f30e2135b0db 31 * OF SUCH DAMAGE.
Yann 0:f30e2135b0db 32 *
Yann 0:f30e2135b0db 33 * This file is part of the lwIP TCP/IP stack.
Yann 0:f30e2135b0db 34 *
Yann 0:f30e2135b0db 35 * Author: Adam Dunkels <adam@sics.se>
Yann 0:f30e2135b0db 36 *
Yann 0:f30e2135b0db 37 */
Yann 0:f30e2135b0db 38
Yann 0:f30e2135b0db 39
Yann 0:f30e2135b0db 40 /* udp.c
Yann 0:f30e2135b0db 41 *
Yann 0:f30e2135b0db 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
Yann 0:f30e2135b0db 43 *
Yann 0:f30e2135b0db 44 */
Yann 0:f30e2135b0db 45
Yann 0:f30e2135b0db 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
Yann 0:f30e2135b0db 47 */
Yann 0:f30e2135b0db 48
Yann 0:f30e2135b0db 49 #include "lwip/opt.h"
Yann 0:f30e2135b0db 50
Yann 0:f30e2135b0db 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
Yann 0:f30e2135b0db 52
Yann 0:f30e2135b0db 53 #include "lwip/udp.h"
Yann 0:f30e2135b0db 54 #include "lwip/def.h"
Yann 0:f30e2135b0db 55 #include "lwip/memp.h"
Yann 0:f30e2135b0db 56 #include "lwip/inet_chksum.h"
Yann 0:f30e2135b0db 57 #include "lwip/ip_addr.h"
Yann 0:f30e2135b0db 58 #include "lwip/netif.h"
Yann 0:f30e2135b0db 59 #include "lwip/icmp.h"
Yann 0:f30e2135b0db 60 #include "lwip/stats.h"
Yann 0:f30e2135b0db 61 #include "lwip/snmp.h"
Yann 0:f30e2135b0db 62 #include "arch/perf.h"
Yann 0:f30e2135b0db 63 #include "lwip/dhcp.h"
Yann 0:f30e2135b0db 64
Yann 0:f30e2135b0db 65 #include <string.h>
Yann 0:f30e2135b0db 66
Yann 0:f30e2135b0db 67 /* The list of UDP PCBs */
Yann 0:f30e2135b0db 68 /* exported in udp.h (was static) */
Yann 0:f30e2135b0db 69 struct udp_pcb *udp_pcbs;
Yann 0:f30e2135b0db 70
Yann 0:f30e2135b0db 71 /**
Yann 0:f30e2135b0db 72 * Process an incoming UDP datagram.
Yann 0:f30e2135b0db 73 *
Yann 0:f30e2135b0db 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
Yann 0:f30e2135b0db 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
Yann 0:f30e2135b0db 76 * recv function. If no pcb is found or the datagram is incorrect, the
Yann 0:f30e2135b0db 77 * pbuf is freed.
Yann 0:f30e2135b0db 78 *
Yann 0:f30e2135b0db 79 * @param p pbuf to be demultiplexed to a UDP PCB.
Yann 0:f30e2135b0db 80 * @param inp network interface on which the datagram was received.
Yann 0:f30e2135b0db 81 *
Yann 0:f30e2135b0db 82 */
Yann 0:f30e2135b0db 83 void
Yann 0:f30e2135b0db 84 udp_input(struct pbuf *p, struct netif *inp)
Yann 0:f30e2135b0db 85 {
Yann 0:f30e2135b0db 86 struct udp_hdr *udphdr;
Yann 0:f30e2135b0db 87 struct udp_pcb *pcb, *prev;
Yann 0:f30e2135b0db 88 struct udp_pcb *uncon_pcb;
Yann 0:f30e2135b0db 89 struct ip_hdr *iphdr;
Yann 0:f30e2135b0db 90 u16_t src, dest;
Yann 0:f30e2135b0db 91 u8_t local_match;
Yann 0:f30e2135b0db 92 u8_t broadcast;
Yann 0:f30e2135b0db 93
Yann 0:f30e2135b0db 94 PERF_START;
Yann 0:f30e2135b0db 95
Yann 0:f30e2135b0db 96 UDP_STATS_INC(udp.recv);
Yann 0:f30e2135b0db 97
Yann 0:f30e2135b0db 98 iphdr = (struct ip_hdr *)p->payload;
Yann 0:f30e2135b0db 99
Yann 0:f30e2135b0db 100 /* Check minimum length (IP header + UDP header)
Yann 0:f30e2135b0db 101 * and move payload pointer to UDP header */
Yann 0:f30e2135b0db 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
Yann 0:f30e2135b0db 103 /* drop short packets */
Yann 0:f30e2135b0db 104 LWIP_DEBUGF(UDP_DEBUG,
Yann 0:f30e2135b0db 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
Yann 0:f30e2135b0db 106 UDP_STATS_INC(udp.lenerr);
Yann 0:f30e2135b0db 107 UDP_STATS_INC(udp.drop);
Yann 0:f30e2135b0db 108 snmp_inc_udpinerrors();
Yann 0:f30e2135b0db 109 pbuf_free(p);
Yann 0:f30e2135b0db 110 goto end;
Yann 0:f30e2135b0db 111 }
Yann 0:f30e2135b0db 112
Yann 0:f30e2135b0db 113 udphdr = (struct udp_hdr *)p->payload;
Yann 0:f30e2135b0db 114
Yann 0:f30e2135b0db 115 /* is broadcast packet ? */
Yann 0:f30e2135b0db 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
Yann 0:f30e2135b0db 117
Yann 0:f30e2135b0db 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
Yann 0:f30e2135b0db 119
Yann 0:f30e2135b0db 120 /* convert src and dest ports to host byte order */
Yann 0:f30e2135b0db 121 src = ntohs(udphdr->src);
Yann 0:f30e2135b0db 122 dest = ntohs(udphdr->dest);
Yann 0:f30e2135b0db 123
Yann 0:f30e2135b0db 124 udp_debug_print(udphdr);
Yann 0:f30e2135b0db 125
Yann 0:f30e2135b0db 126 /* print the UDP source and destination */
Yann 0:f30e2135b0db 127 LWIP_DEBUGF(UDP_DEBUG,
Yann 0:f30e2135b0db 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
Yann 0:f30e2135b0db 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
Yann 0:f30e2135b0db 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
Yann 0:f30e2135b0db 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
Yann 0:f30e2135b0db 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
Yann 0:f30e2135b0db 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
Yann 0:f30e2135b0db 134
Yann 0:f30e2135b0db 135 #if LWIP_DHCP
Yann 0:f30e2135b0db 136 pcb = NULL;
Yann 0:f30e2135b0db 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
Yann 0:f30e2135b0db 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
Yann 0:f30e2135b0db 139 if (dest == DHCP_CLIENT_PORT) {
Yann 0:f30e2135b0db 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
Yann 0:f30e2135b0db 141 if (src == DHCP_SERVER_PORT) {
Yann 0:f30e2135b0db 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
Yann 0:f30e2135b0db 143 /* accept the packe if
Yann 0:f30e2135b0db 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
Yann 0:f30e2135b0db 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
Yann 0:f30e2135b0db 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
Yann 0:f30e2135b0db 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
Yann 0:f30e2135b0db 148 pcb = inp->dhcp->pcb;
Yann 0:f30e2135b0db 149 }
Yann 0:f30e2135b0db 150 }
Yann 0:f30e2135b0db 151 }
Yann 0:f30e2135b0db 152 } else
Yann 0:f30e2135b0db 153 #endif /* LWIP_DHCP */
Yann 0:f30e2135b0db 154 {
Yann 0:f30e2135b0db 155 prev = NULL;
Yann 0:f30e2135b0db 156 local_match = 0;
Yann 0:f30e2135b0db 157 uncon_pcb = NULL;
Yann 0:f30e2135b0db 158 /* Iterate through the UDP pcb list for a matching pcb.
Yann 0:f30e2135b0db 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
Yann 0:f30e2135b0db 160 * preferred. If no perfect match is found, the first unconnected pcb that
Yann 0:f30e2135b0db 161 * matches the local port and ip address gets the datagram. */
Yann 0:f30e2135b0db 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
Yann 0:f30e2135b0db 163 local_match = 0;
Yann 0:f30e2135b0db 164 /* print the PCB local and remote address */
Yann 0:f30e2135b0db 165 LWIP_DEBUGF(UDP_DEBUG,
Yann 0:f30e2135b0db 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
Yann 0:f30e2135b0db 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
Yann 0:f30e2135b0db 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
Yann 0:f30e2135b0db 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
Yann 0:f30e2135b0db 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
Yann 0:f30e2135b0db 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
Yann 0:f30e2135b0db 172
Yann 0:f30e2135b0db 173 /* compare PCB local addr+port to UDP destination addr+port */
Yann 0:f30e2135b0db 174 if ((pcb->local_port == dest) &&
Yann 0:f30e2135b0db 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
Yann 0:f30e2135b0db 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
Yann 0:f30e2135b0db 177 #if LWIP_IGMP
Yann 0:f30e2135b0db 178 ip_addr_ismulticast(&current_iphdr_dest) ||
Yann 0:f30e2135b0db 179 #endif /* LWIP_IGMP */
Yann 0:f30e2135b0db 180 #if IP_SOF_BROADCAST_RECV
Yann 0:f30e2135b0db 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
Yann 0:f30e2135b0db 182 #else /* IP_SOF_BROADCAST_RECV */
Yann 0:f30e2135b0db 183 (broadcast))) {
Yann 0:f30e2135b0db 184 #endif /* IP_SOF_BROADCAST_RECV */
Yann 0:f30e2135b0db 185 local_match = 1;
Yann 0:f30e2135b0db 186 if ((uncon_pcb == NULL) &&
Yann 0:f30e2135b0db 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
Yann 0:f30e2135b0db 188 /* the first unconnected matching PCB */
Yann 0:f30e2135b0db 189 uncon_pcb = pcb;
Yann 0:f30e2135b0db 190 }
Yann 0:f30e2135b0db 191 }
Yann 0:f30e2135b0db 192 /* compare PCB remote addr+port to UDP source addr+port */
Yann 0:f30e2135b0db 193 if ((local_match != 0) &&
Yann 0:f30e2135b0db 194 (pcb->remote_port == src) &&
Yann 0:f30e2135b0db 195 (ip_addr_isany(&pcb->remote_ip) ||
Yann 0:f30e2135b0db 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
Yann 0:f30e2135b0db 197 /* the first fully matching PCB */
Yann 0:f30e2135b0db 198 if (prev != NULL) {
Yann 0:f30e2135b0db 199 /* move the pcb to the front of udp_pcbs so that is
Yann 0:f30e2135b0db 200 found faster next time */
Yann 0:f30e2135b0db 201 prev->next = pcb->next;
Yann 0:f30e2135b0db 202 pcb->next = udp_pcbs;
Yann 0:f30e2135b0db 203 udp_pcbs = pcb;
Yann 0:f30e2135b0db 204 } else {
Yann 0:f30e2135b0db 205 UDP_STATS_INC(udp.cachehit);
Yann 0:f30e2135b0db 206 }
Yann 0:f30e2135b0db 207 break;
Yann 0:f30e2135b0db 208 }
Yann 0:f30e2135b0db 209 prev = pcb;
Yann 0:f30e2135b0db 210 }
Yann 0:f30e2135b0db 211 /* no fully matching pcb found? then look for an unconnected pcb */
Yann 0:f30e2135b0db 212 if (pcb == NULL) {
Yann 0:f30e2135b0db 213 pcb = uncon_pcb;
Yann 0:f30e2135b0db 214 }
Yann 0:f30e2135b0db 215 }
Yann 0:f30e2135b0db 216
Yann 0:f30e2135b0db 217 /* Check checksum if this is a match or if it was directed at us. */
Yann 0:f30e2135b0db 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
Yann 0:f30e2135b0db 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
Yann 0:f30e2135b0db 220 #if LWIP_UDPLITE
Yann 0:f30e2135b0db 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
Yann 0:f30e2135b0db 222 /* Do the UDP Lite checksum */
Yann 0:f30e2135b0db 223 #if CHECKSUM_CHECK_UDP
Yann 0:f30e2135b0db 224 u16_t chklen = ntohs(udphdr->len);
Yann 0:f30e2135b0db 225 if (chklen < sizeof(struct udp_hdr)) {
Yann 0:f30e2135b0db 226 if (chklen == 0) {
Yann 0:f30e2135b0db 227 /* For UDP-Lite, checksum length of 0 means checksum
Yann 0:f30e2135b0db 228 over the complete packet (See RFC 3828 chap. 3.1) */
Yann 0:f30e2135b0db 229 chklen = p->tot_len;
Yann 0:f30e2135b0db 230 } else {
Yann 0:f30e2135b0db 231 /* At least the UDP-Lite header must be covered by the
Yann 0:f30e2135b0db 232 checksum! (Again, see RFC 3828 chap. 3.1) */
Yann 0:f30e2135b0db 233 UDP_STATS_INC(udp.chkerr);
Yann 0:f30e2135b0db 234 UDP_STATS_INC(udp.drop);
Yann 0:f30e2135b0db 235 snmp_inc_udpinerrors();
Yann 0:f30e2135b0db 236 pbuf_free(p);
Yann 0:f30e2135b0db 237 goto end;
Yann 0:f30e2135b0db 238 }
Yann 0:f30e2135b0db 239 }
Yann 0:f30e2135b0db 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
Yann 0:f30e2135b0db 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
Yann 0:f30e2135b0db 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
Yann 0:f30e2135b0db 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
Yann 0:f30e2135b0db 244 UDP_STATS_INC(udp.chkerr);
Yann 0:f30e2135b0db 245 UDP_STATS_INC(udp.drop);
Yann 0:f30e2135b0db 246 snmp_inc_udpinerrors();
Yann 0:f30e2135b0db 247 pbuf_free(p);
Yann 0:f30e2135b0db 248 goto end;
Yann 0:f30e2135b0db 249 }
Yann 0:f30e2135b0db 250 #endif /* CHECKSUM_CHECK_UDP */
Yann 0:f30e2135b0db 251 } else
Yann 0:f30e2135b0db 252 #endif /* LWIP_UDPLITE */
Yann 0:f30e2135b0db 253 {
Yann 0:f30e2135b0db 254 #if CHECKSUM_CHECK_UDP
Yann 0:f30e2135b0db 255 if (udphdr->chksum != 0) {
Yann 0:f30e2135b0db 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
Yann 0:f30e2135b0db 257 IP_PROTO_UDP, p->tot_len) != 0) {
Yann 0:f30e2135b0db 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
Yann 0:f30e2135b0db 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
Yann 0:f30e2135b0db 260 UDP_STATS_INC(udp.chkerr);
Yann 0:f30e2135b0db 261 UDP_STATS_INC(udp.drop);
Yann 0:f30e2135b0db 262 snmp_inc_udpinerrors();
Yann 0:f30e2135b0db 263 pbuf_free(p);
Yann 0:f30e2135b0db 264 goto end;
Yann 0:f30e2135b0db 265 }
Yann 0:f30e2135b0db 266 }
Yann 0:f30e2135b0db 267 #endif /* CHECKSUM_CHECK_UDP */
Yann 0:f30e2135b0db 268 }
Yann 0:f30e2135b0db 269 if(pbuf_header(p, -UDP_HLEN)) {
Yann 0:f30e2135b0db 270 /* Can we cope with this failing? Just assert for now */
Yann 0:f30e2135b0db 271 LWIP_ASSERT("pbuf_header failed\n", 0);
Yann 0:f30e2135b0db 272 UDP_STATS_INC(udp.drop);
Yann 0:f30e2135b0db 273 snmp_inc_udpinerrors();
Yann 0:f30e2135b0db 274 pbuf_free(p);
Yann 0:f30e2135b0db 275 goto end;
Yann 0:f30e2135b0db 276 }
Yann 0:f30e2135b0db 277 if (pcb != NULL) {
Yann 0:f30e2135b0db 278 snmp_inc_udpindatagrams();
Yann 0:f30e2135b0db 279 #if SO_REUSE && SO_REUSE_RXTOALL
Yann 0:f30e2135b0db 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
Yann 0:f30e2135b0db 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
Yann 0:f30e2135b0db 282 /* pass broadcast- or multicast packets to all multicast pcbs
Yann 0:f30e2135b0db 283 if SOF_REUSEADDR is set on the first match */
Yann 0:f30e2135b0db 284 struct udp_pcb *mpcb;
Yann 0:f30e2135b0db 285 u8_t p_header_changed = 0;
Yann 0:f30e2135b0db 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
Yann 0:f30e2135b0db 287 if (mpcb != pcb) {
Yann 0:f30e2135b0db 288 /* compare PCB local addr+port to UDP destination addr+port */
Yann 0:f30e2135b0db 289 if ((mpcb->local_port == dest) &&
Yann 0:f30e2135b0db 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
Yann 0:f30e2135b0db 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
Yann 0:f30e2135b0db 292 #if LWIP_IGMP
Yann 0:f30e2135b0db 293 ip_addr_ismulticast(&current_iphdr_dest) ||
Yann 0:f30e2135b0db 294 #endif /* LWIP_IGMP */
Yann 0:f30e2135b0db 295 #if IP_SOF_BROADCAST_RECV
Yann 0:f30e2135b0db 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
Yann 0:f30e2135b0db 297 #else /* IP_SOF_BROADCAST_RECV */
Yann 0:f30e2135b0db 298 (broadcast))) {
Yann 0:f30e2135b0db 299 #endif /* IP_SOF_BROADCAST_RECV */
Yann 0:f30e2135b0db 300 /* pass a copy of the packet to all local matches */
Yann 0:f30e2135b0db 301 if (mpcb->recv != NULL) {
Yann 0:f30e2135b0db 302 struct pbuf *q;
Yann 0:f30e2135b0db 303 /* for that, move payload to IP header again */
Yann 0:f30e2135b0db 304 if (p_header_changed == 0) {
Yann 0:f30e2135b0db 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
Yann 0:f30e2135b0db 306 p_header_changed = 1;
Yann 0:f30e2135b0db 307 }
Yann 0:f30e2135b0db 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
Yann 0:f30e2135b0db 309 if (q != NULL) {
Yann 0:f30e2135b0db 310 err_t err = pbuf_copy(q, p);
Yann 0:f30e2135b0db 311 if (err == ERR_OK) {
Yann 0:f30e2135b0db 312 /* move payload to UDP data */
Yann 0:f30e2135b0db 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
Yann 0:f30e2135b0db 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
Yann 0:f30e2135b0db 315 }
Yann 0:f30e2135b0db 316 }
Yann 0:f30e2135b0db 317 }
Yann 0:f30e2135b0db 318 }
Yann 0:f30e2135b0db 319 }
Yann 0:f30e2135b0db 320 }
Yann 0:f30e2135b0db 321 if (p_header_changed) {
Yann 0:f30e2135b0db 322 /* and move payload to UDP data again */
Yann 0:f30e2135b0db 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
Yann 0:f30e2135b0db 324 }
Yann 0:f30e2135b0db 325 }
Yann 0:f30e2135b0db 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
Yann 0:f30e2135b0db 327 /* callback */
Yann 0:f30e2135b0db 328 if (pcb->recv != NULL) {
Yann 0:f30e2135b0db 329 /* now the recv function is responsible for freeing p */
Yann 0:f30e2135b0db 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
Yann 0:f30e2135b0db 331 } else {
Yann 0:f30e2135b0db 332 /* no recv function registered? then we have to free the pbuf! */
Yann 0:f30e2135b0db 333 pbuf_free(p);
Yann 0:f30e2135b0db 334 goto end;
Yann 0:f30e2135b0db 335 }
Yann 0:f30e2135b0db 336 } else {
Yann 0:f30e2135b0db 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
Yann 0:f30e2135b0db 338
Yann 0:f30e2135b0db 339 #if LWIP_ICMP
Yann 0:f30e2135b0db 340 /* No match was found, send ICMP destination port unreachable unless
Yann 0:f30e2135b0db 341 destination address was broadcast/multicast. */
Yann 0:f30e2135b0db 342 if (!broadcast &&
Yann 0:f30e2135b0db 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
Yann 0:f30e2135b0db 344 /* move payload pointer back to ip header */
Yann 0:f30e2135b0db 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
Yann 0:f30e2135b0db 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
Yann 0:f30e2135b0db 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
Yann 0:f30e2135b0db 348 }
Yann 0:f30e2135b0db 349 #endif /* LWIP_ICMP */
Yann 0:f30e2135b0db 350 UDP_STATS_INC(udp.proterr);
Yann 0:f30e2135b0db 351 UDP_STATS_INC(udp.drop);
Yann 0:f30e2135b0db 352 snmp_inc_udpnoports();
Yann 0:f30e2135b0db 353 pbuf_free(p);
Yann 0:f30e2135b0db 354 }
Yann 0:f30e2135b0db 355 } else {
Yann 0:f30e2135b0db 356 pbuf_free(p);
Yann 0:f30e2135b0db 357 }
Yann 0:f30e2135b0db 358 end:
Yann 0:f30e2135b0db 359 PERF_STOP("udp_input");
Yann 0:f30e2135b0db 360 }
Yann 0:f30e2135b0db 361
Yann 0:f30e2135b0db 362 /**
Yann 0:f30e2135b0db 363 * Send data using UDP.
Yann 0:f30e2135b0db 364 *
Yann 0:f30e2135b0db 365 * @param pcb UDP PCB used to send the data.
Yann 0:f30e2135b0db 366 * @param p chain of pbuf's to be sent.
Yann 0:f30e2135b0db 367 *
Yann 0:f30e2135b0db 368 * The datagram will be sent to the current remote_ip & remote_port
Yann 0:f30e2135b0db 369 * stored in pcb. If the pcb is not bound to a port, it will
Yann 0:f30e2135b0db 370 * automatically be bound to a random port.
Yann 0:f30e2135b0db 371 *
Yann 0:f30e2135b0db 372 * @return lwIP error code.
Yann 0:f30e2135b0db 373 * - ERR_OK. Successful. No error occured.
Yann 0:f30e2135b0db 374 * - ERR_MEM. Out of memory.
Yann 0:f30e2135b0db 375 * - ERR_RTE. Could not find route to destination address.
Yann 0:f30e2135b0db 376 * - More errors could be returned by lower protocol layers.
Yann 0:f30e2135b0db 377 *
Yann 0:f30e2135b0db 378 * @see udp_disconnect() udp_sendto()
Yann 0:f30e2135b0db 379 */
Yann 0:f30e2135b0db 380 err_t
Yann 0:f30e2135b0db 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
Yann 0:f30e2135b0db 382 {
Yann 0:f30e2135b0db 383 /* send to the packet using remote ip and port stored in the pcb */
Yann 0:f30e2135b0db 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
Yann 0:f30e2135b0db 385 }
Yann 0:f30e2135b0db 386
Yann 0:f30e2135b0db 387 #if LWIP_CHECKSUM_ON_COPY
Yann 0:f30e2135b0db 388 /** Same as udp_send() but with checksum
Yann 0:f30e2135b0db 389 */
Yann 0:f30e2135b0db 390 err_t
Yann 0:f30e2135b0db 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
Yann 0:f30e2135b0db 392 u8_t have_chksum, u16_t chksum)
Yann 0:f30e2135b0db 393 {
Yann 0:f30e2135b0db 394 /* send to the packet using remote ip and port stored in the pcb */
Yann 0:f30e2135b0db 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
Yann 0:f30e2135b0db 396 have_chksum, chksum);
Yann 0:f30e2135b0db 397 }
Yann 0:f30e2135b0db 398 #endif /* LWIP_CHECKSUM_ON_COPY */
Yann 0:f30e2135b0db 399
Yann 0:f30e2135b0db 400 /**
Yann 0:f30e2135b0db 401 * Send data to a specified address using UDP.
Yann 0:f30e2135b0db 402 *
Yann 0:f30e2135b0db 403 * @param pcb UDP PCB used to send the data.
Yann 0:f30e2135b0db 404 * @param p chain of pbuf's to be sent.
Yann 0:f30e2135b0db 405 * @param dst_ip Destination IP address.
Yann 0:f30e2135b0db 406 * @param dst_port Destination UDP port.
Yann 0:f30e2135b0db 407 *
Yann 0:f30e2135b0db 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
Yann 0:f30e2135b0db 409 *
Yann 0:f30e2135b0db 410 * If the PCB already has a remote address association, it will
Yann 0:f30e2135b0db 411 * be restored after the data is sent.
Yann 0:f30e2135b0db 412 *
Yann 0:f30e2135b0db 413 * @return lwIP error code (@see udp_send for possible error codes)
Yann 0:f30e2135b0db 414 *
Yann 0:f30e2135b0db 415 * @see udp_disconnect() udp_send()
Yann 0:f30e2135b0db 416 */
Yann 0:f30e2135b0db 417 err_t
Yann 0:f30e2135b0db 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
Yann 0:f30e2135b0db 419 ip_addr_t *dst_ip, u16_t dst_port)
Yann 0:f30e2135b0db 420 {
Yann 0:f30e2135b0db 421 #if LWIP_CHECKSUM_ON_COPY
Yann 0:f30e2135b0db 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
Yann 0:f30e2135b0db 423 }
Yann 0:f30e2135b0db 424
Yann 0:f30e2135b0db 425 /** Same as udp_sendto(), but with checksum */
Yann 0:f30e2135b0db 426 err_t
Yann 0:f30e2135b0db 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
Yann 0:f30e2135b0db 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
Yann 0:f30e2135b0db 429 {
Yann 0:f30e2135b0db 430 #endif /* LWIP_CHECKSUM_ON_COPY */
Yann 0:f30e2135b0db 431 struct netif *netif;
Yann 0:f30e2135b0db 432
Yann 0:f30e2135b0db 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
Yann 0:f30e2135b0db 434
Yann 0:f30e2135b0db 435 /* find the outgoing network interface for this packet */
Yann 0:f30e2135b0db 436 #if LWIP_IGMP
Yann 0:f30e2135b0db 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
Yann 0:f30e2135b0db 438 #else
Yann 0:f30e2135b0db 439 netif = ip_route(dst_ip);
Yann 0:f30e2135b0db 440 #endif /* LWIP_IGMP */
Yann 0:f30e2135b0db 441
Yann 0:f30e2135b0db 442 /* no outgoing network interface could be found? */
Yann 0:f30e2135b0db 443 if (netif == NULL) {
Yann 0:f30e2135b0db 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
Yann 0:f30e2135b0db 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
Yann 0:f30e2135b0db 446 UDP_STATS_INC(udp.rterr);
Yann 0:f30e2135b0db 447 return ERR_RTE;
Yann 0:f30e2135b0db 448 }
Yann 0:f30e2135b0db 449 #if LWIP_CHECKSUM_ON_COPY
Yann 0:f30e2135b0db 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
Yann 0:f30e2135b0db 451 #else /* LWIP_CHECKSUM_ON_COPY */
Yann 0:f30e2135b0db 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
Yann 0:f30e2135b0db 453 #endif /* LWIP_CHECKSUM_ON_COPY */
Yann 0:f30e2135b0db 454 }
Yann 0:f30e2135b0db 455
Yann 0:f30e2135b0db 456 /**
Yann 0:f30e2135b0db 457 * Send data to a specified address using UDP.
Yann 0:f30e2135b0db 458 * The netif used for sending can be specified.
Yann 0:f30e2135b0db 459 *
Yann 0:f30e2135b0db 460 * This function exists mainly for DHCP, to be able to send UDP packets
Yann 0:f30e2135b0db 461 * on a netif that is still down.
Yann 0:f30e2135b0db 462 *
Yann 0:f30e2135b0db 463 * @param pcb UDP PCB used to send the data.
Yann 0:f30e2135b0db 464 * @param p chain of pbuf's to be sent.
Yann 0:f30e2135b0db 465 * @param dst_ip Destination IP address.
Yann 0:f30e2135b0db 466 * @param dst_port Destination UDP port.
Yann 0:f30e2135b0db 467 * @param netif the netif used for sending.
Yann 0:f30e2135b0db 468 *
Yann 0:f30e2135b0db 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
Yann 0:f30e2135b0db 470 *
Yann 0:f30e2135b0db 471 * @return lwIP error code (@see udp_send for possible error codes)
Yann 0:f30e2135b0db 472 *
Yann 0:f30e2135b0db 473 * @see udp_disconnect() udp_send()
Yann 0:f30e2135b0db 474 */
Yann 0:f30e2135b0db 475 err_t
Yann 0:f30e2135b0db 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
Yann 0:f30e2135b0db 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
Yann 0:f30e2135b0db 478 {
Yann 0:f30e2135b0db 479 #if LWIP_CHECKSUM_ON_COPY
Yann 0:f30e2135b0db 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
Yann 0:f30e2135b0db 481 }
Yann 0:f30e2135b0db 482
Yann 0:f30e2135b0db 483 /** Same as udp_sendto_if(), but with checksum */
Yann 0:f30e2135b0db 484 err_t
Yann 0:f30e2135b0db 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
Yann 0:f30e2135b0db 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
Yann 0:f30e2135b0db 487 u16_t chksum)
Yann 0:f30e2135b0db 488 {
Yann 0:f30e2135b0db 489 #endif /* LWIP_CHECKSUM_ON_COPY */
Yann 0:f30e2135b0db 490 struct udp_hdr *udphdr;
Yann 0:f30e2135b0db 491 ip_addr_t *src_ip;
Yann 0:f30e2135b0db 492 err_t err;
Yann 0:f30e2135b0db 493 struct pbuf *q; /* q will be sent down the stack */
Yann 0:f30e2135b0db 494
Yann 0:f30e2135b0db 495 #if IP_SOF_BROADCAST
Yann 0:f30e2135b0db 496 /* broadcast filter? */
Yann 0:f30e2135b0db 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
Yann 0:f30e2135b0db 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
Yann 0:f30e2135b0db 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
Yann 0:f30e2135b0db 500 return ERR_VAL;
Yann 0:f30e2135b0db 501 }
Yann 0:f30e2135b0db 502 #endif /* IP_SOF_BROADCAST */
Yann 0:f30e2135b0db 503
Yann 0:f30e2135b0db 504 /* if the PCB is not yet bound to a port, bind it here */
Yann 0:f30e2135b0db 505 if (pcb->local_port == 0) {
Yann 0:f30e2135b0db 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
Yann 0:f30e2135b0db 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
Yann 0:f30e2135b0db 508 if (err != ERR_OK) {
Yann 0:f30e2135b0db 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
Yann 0:f30e2135b0db 510 return err;
Yann 0:f30e2135b0db 511 }
Yann 0:f30e2135b0db 512 }
Yann 0:f30e2135b0db 513
Yann 0:f30e2135b0db 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
Yann 0:f30e2135b0db 515 if (pbuf_header(p, UDP_HLEN)) {
Yann 0:f30e2135b0db 516 /* allocate header in a separate new pbuf */
Yann 0:f30e2135b0db 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
Yann 0:f30e2135b0db 518 /* new header pbuf could not be allocated? */
Yann 0:f30e2135b0db 519 if (q == NULL) {
Yann 0:f30e2135b0db 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
Yann 0:f30e2135b0db 521 return ERR_MEM;
Yann 0:f30e2135b0db 522 }
Yann 0:f30e2135b0db 523 /* chain header q in front of given pbuf p */
Yann 0:f30e2135b0db 524 pbuf_chain(q, p);
Yann 0:f30e2135b0db 525 /* first pbuf q points to header pbuf */
Yann 0:f30e2135b0db 526 LWIP_DEBUGF(UDP_DEBUG,
Yann 0:f30e2135b0db 527 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
Yann 0:f30e2135b0db 528 } else {
Yann 0:f30e2135b0db 529 /* adding space for header within p succeeded */
Yann 0:f30e2135b0db 530 /* first pbuf q equals given pbuf */
Yann 0:f30e2135b0db 531 q = p;
Yann 0:f30e2135b0db 532 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
Yann 0:f30e2135b0db 533 }
Yann 0:f30e2135b0db 534 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
Yann 0:f30e2135b0db 535 (q->len >= sizeof(struct udp_hdr)));
Yann 0:f30e2135b0db 536 /* q now represents the packet to be sent */
Yann 0:f30e2135b0db 537 udphdr = (struct udp_hdr *)q->payload;
Yann 0:f30e2135b0db 538 udphdr->src = htons(pcb->local_port);
Yann 0:f30e2135b0db 539 udphdr->dest = htons(dst_port);
Yann 0:f30e2135b0db 540 /* in UDP, 0 checksum means 'no checksum' */
Yann 0:f30e2135b0db 541 udphdr->chksum = 0x0000;
Yann 0:f30e2135b0db 542
Yann 0:f30e2135b0db 543 /* Multicast Loop? */
Yann 0:f30e2135b0db 544 #if LWIP_IGMP
Yann 0:f30e2135b0db 545 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
Yann 0:f30e2135b0db 546 q->flags |= PBUF_FLAG_MCASTLOOP;
Yann 0:f30e2135b0db 547 }
Yann 0:f30e2135b0db 548 #endif /* LWIP_IGMP */
Yann 0:f30e2135b0db 549
Yann 0:f30e2135b0db 550
Yann 0:f30e2135b0db 551 /* PCB local address is IP_ANY_ADDR? */
Yann 0:f30e2135b0db 552 if (ip_addr_isany(&pcb->local_ip)) {
Yann 0:f30e2135b0db 553 /* use outgoing network interface IP address as source address */
Yann 0:f30e2135b0db 554 src_ip = &(netif->ip_addr);
Yann 0:f30e2135b0db 555 } else {
Yann 0:f30e2135b0db 556 /* check if UDP PCB local IP address is correct
Yann 0:f30e2135b0db 557 * this could be an old address if netif->ip_addr has changed */
Yann 0:f30e2135b0db 558 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
Yann 0:f30e2135b0db 559 /* local_ip doesn't match, drop the packet */
Yann 0:f30e2135b0db 560 if (q != p) {
Yann 0:f30e2135b0db 561 /* free the header pbuf */
Yann 0:f30e2135b0db 562 pbuf_free(q);
Yann 0:f30e2135b0db 563 q = NULL;
Yann 0:f30e2135b0db 564 /* p is still referenced by the caller, and will live on */
Yann 0:f30e2135b0db 565 }
Yann 0:f30e2135b0db 566 return ERR_VAL;
Yann 0:f30e2135b0db 567 }
Yann 0:f30e2135b0db 568 /* use UDP PCB local IP address as source address */
Yann 0:f30e2135b0db 569 src_ip = &(pcb->local_ip);
Yann 0:f30e2135b0db 570 }
Yann 0:f30e2135b0db 571
Yann 0:f30e2135b0db 572 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
Yann 0:f30e2135b0db 573
Yann 0:f30e2135b0db 574 #if LWIP_UDPLITE
Yann 0:f30e2135b0db 575 /* UDP Lite protocol? */
Yann 0:f30e2135b0db 576 if (pcb->flags & UDP_FLAGS_UDPLITE) {
Yann 0:f30e2135b0db 577 u16_t chklen, chklen_hdr;
Yann 0:f30e2135b0db 578 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
Yann 0:f30e2135b0db 579 /* set UDP message length in UDP header */
Yann 0:f30e2135b0db 580 chklen_hdr = chklen = pcb->chksum_len_tx;
Yann 0:f30e2135b0db 581 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
Yann 0:f30e2135b0db 582 if (chklen != 0) {
Yann 0:f30e2135b0db 583 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
Yann 0:f30e2135b0db 584 }
Yann 0:f30e2135b0db 585 /* For UDP-Lite, checksum length of 0 means checksum
Yann 0:f30e2135b0db 586 over the complete packet. (See RFC 3828 chap. 3.1)
Yann 0:f30e2135b0db 587 At least the UDP-Lite header must be covered by the
Yann 0:f30e2135b0db 588 checksum, therefore, if chksum_len has an illegal
Yann 0:f30e2135b0db 589 value, we generate the checksum over the complete
Yann 0:f30e2135b0db 590 packet to be safe. */
Yann 0:f30e2135b0db 591 chklen_hdr = 0;
Yann 0:f30e2135b0db 592 chklen = q->tot_len;
Yann 0:f30e2135b0db 593 }
Yann 0:f30e2135b0db 594 udphdr->len = htons(chklen_hdr);
Yann 0:f30e2135b0db 595 /* calculate checksum */
Yann 0:f30e2135b0db 596 #if CHECKSUM_GEN_UDP
Yann 0:f30e2135b0db 597 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
Yann 0:f30e2135b0db 598 IP_PROTO_UDPLITE, q->tot_len,
Yann 0:f30e2135b0db 599 #if !LWIP_CHECKSUM_ON_COPY
Yann 0:f30e2135b0db 600 chklen);
Yann 0:f30e2135b0db 601 #else /* !LWIP_CHECKSUM_ON_COPY */
Yann 0:f30e2135b0db 602 (have_chksum ? UDP_HLEN : chklen));
Yann 0:f30e2135b0db 603 if (have_chksum) {
Yann 0:f30e2135b0db 604 u32_t acc;
Yann 0:f30e2135b0db 605 acc = udphdr->chksum + (u16_t)~(chksum);
Yann 0:f30e2135b0db 606 udphdr->chksum = FOLD_U32T(acc);
Yann 0:f30e2135b0db 607 }
Yann 0:f30e2135b0db 608 #endif /* !LWIP_CHECKSUM_ON_COPY */
Yann 0:f30e2135b0db 609
Yann 0:f30e2135b0db 610 /* chksum zero must become 0xffff, as zero means 'no checksum' */
Yann 0:f30e2135b0db 611 if (udphdr->chksum == 0x0000) {
Yann 0:f30e2135b0db 612 udphdr->chksum = 0xffff;
Yann 0:f30e2135b0db 613 }
Yann 0:f30e2135b0db 614 #endif /* CHECKSUM_GEN_UDP */
Yann 0:f30e2135b0db 615 /* output to IP */
Yann 0:f30e2135b0db 616 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
Yann 0:f30e2135b0db 617 #if LWIP_NETIF_HWADDRHINT
Yann 0:f30e2135b0db 618 netif->addr_hint = &(pcb->addr_hint);
Yann 0:f30e2135b0db 619 #endif /* LWIP_NETIF_HWADDRHINT*/
Yann 0:f30e2135b0db 620 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
Yann 0:f30e2135b0db 621 #if LWIP_NETIF_HWADDRHINT
Yann 0:f30e2135b0db 622 netif->addr_hint = NULL;
Yann 0:f30e2135b0db 623 #endif /* LWIP_NETIF_HWADDRHINT*/
Yann 0:f30e2135b0db 624 } else
Yann 0:f30e2135b0db 625 #endif /* LWIP_UDPLITE */
Yann 0:f30e2135b0db 626 { /* UDP */
Yann 0:f30e2135b0db 627 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
Yann 0:f30e2135b0db 628 udphdr->len = htons(q->tot_len);
Yann 0:f30e2135b0db 629 /* calculate checksum */
Yann 0:f30e2135b0db 630 #if CHECKSUM_GEN_UDP
Yann 0:f30e2135b0db 631 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
Yann 0:f30e2135b0db 632 u16_t udpchksum;
Yann 0:f30e2135b0db 633 #if LWIP_CHECKSUM_ON_COPY
Yann 0:f30e2135b0db 634 if (have_chksum) {
Yann 0:f30e2135b0db 635 u32_t acc;
Yann 0:f30e2135b0db 636 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
Yann 0:f30e2135b0db 637 q->tot_len, UDP_HLEN);
Yann 0:f30e2135b0db 638 acc = udpchksum + (u16_t)~(chksum);
Yann 0:f30e2135b0db 639 udpchksum = FOLD_U32T(acc);
Yann 0:f30e2135b0db 640 } else
Yann 0:f30e2135b0db 641 #endif /* LWIP_CHECKSUM_ON_COPY */
Yann 0:f30e2135b0db 642 {
Yann 0:f30e2135b0db 643 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
Yann 0:f30e2135b0db 644 }
Yann 0:f30e2135b0db 645
Yann 0:f30e2135b0db 646 /* chksum zero must become 0xffff, as zero means 'no checksum' */
Yann 0:f30e2135b0db 647 if (udpchksum == 0x0000) {
Yann 0:f30e2135b0db 648 udpchksum = 0xffff;
Yann 0:f30e2135b0db 649 }
Yann 0:f30e2135b0db 650 udphdr->chksum = udpchksum;
Yann 0:f30e2135b0db 651 }
Yann 0:f30e2135b0db 652 #endif /* CHECKSUM_GEN_UDP */
Yann 0:f30e2135b0db 653 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
Yann 0:f30e2135b0db 654 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
Yann 0:f30e2135b0db 655 /* output to IP */
Yann 0:f30e2135b0db 656 #if LWIP_NETIF_HWADDRHINT
Yann 0:f30e2135b0db 657 netif->addr_hint = &(pcb->addr_hint);
Yann 0:f30e2135b0db 658 #endif /* LWIP_NETIF_HWADDRHINT*/
Yann 0:f30e2135b0db 659 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
Yann 0:f30e2135b0db 660 #if LWIP_NETIF_HWADDRHINT
Yann 0:f30e2135b0db 661 netif->addr_hint = NULL;
Yann 0:f30e2135b0db 662 #endif /* LWIP_NETIF_HWADDRHINT*/
Yann 0:f30e2135b0db 663 }
Yann 0:f30e2135b0db 664 /* TODO: must this be increased even if error occured? */
Yann 0:f30e2135b0db 665 snmp_inc_udpoutdatagrams();
Yann 0:f30e2135b0db 666
Yann 0:f30e2135b0db 667 /* did we chain a separate header pbuf earlier? */
Yann 0:f30e2135b0db 668 if (q != p) {
Yann 0:f30e2135b0db 669 /* free the header pbuf */
Yann 0:f30e2135b0db 670 pbuf_free(q);
Yann 0:f30e2135b0db 671 q = NULL;
Yann 0:f30e2135b0db 672 /* p is still referenced by the caller, and will live on */
Yann 0:f30e2135b0db 673 }
Yann 0:f30e2135b0db 674
Yann 0:f30e2135b0db 675 UDP_STATS_INC(udp.xmit);
Yann 0:f30e2135b0db 676 return err;
Yann 0:f30e2135b0db 677 }
Yann 0:f30e2135b0db 678
Yann 0:f30e2135b0db 679 /**
Yann 0:f30e2135b0db 680 * Bind an UDP PCB.
Yann 0:f30e2135b0db 681 *
Yann 0:f30e2135b0db 682 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
Yann 0:f30e2135b0db 683 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
Yann 0:f30e2135b0db 684 * bind to all local interfaces.
Yann 0:f30e2135b0db 685 * @param port local UDP port to bind with. Use 0 to automatically bind
Yann 0:f30e2135b0db 686 * to a random port between UDP_LOCAL_PORT_RANGE_START and
Yann 0:f30e2135b0db 687 * UDP_LOCAL_PORT_RANGE_END.
Yann 0:f30e2135b0db 688 *
Yann 0:f30e2135b0db 689 * ipaddr & port are expected to be in the same byte order as in the pcb.
Yann 0:f30e2135b0db 690 *
Yann 0:f30e2135b0db 691 * @return lwIP error code.
Yann 0:f30e2135b0db 692 * - ERR_OK. Successful. No error occured.
Yann 0:f30e2135b0db 693 * - ERR_USE. The specified ipaddr and port are already bound to by
Yann 0:f30e2135b0db 694 * another UDP PCB.
Yann 0:f30e2135b0db 695 *
Yann 0:f30e2135b0db 696 * @see udp_disconnect()
Yann 0:f30e2135b0db 697 */
Yann 0:f30e2135b0db 698 err_t
Yann 0:f30e2135b0db 699 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
Yann 0:f30e2135b0db 700 {
Yann 0:f30e2135b0db 701 struct udp_pcb *ipcb;
Yann 0:f30e2135b0db 702 u8_t rebind;
Yann 0:f30e2135b0db 703
Yann 0:f30e2135b0db 704 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
Yann 0:f30e2135b0db 705 ip_addr_debug_print(UDP_DEBUG, ipaddr);
Yann 0:f30e2135b0db 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
Yann 0:f30e2135b0db 707
Yann 0:f30e2135b0db 708 rebind = 0;
Yann 0:f30e2135b0db 709 /* Check for double bind and rebind of the same pcb */
Yann 0:f30e2135b0db 710 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
Yann 0:f30e2135b0db 711 /* is this UDP PCB already on active list? */
Yann 0:f30e2135b0db 712 if (pcb == ipcb) {
Yann 0:f30e2135b0db 713 /* pcb may occur at most once in active list */
Yann 0:f30e2135b0db 714 LWIP_ASSERT("rebind == 0", rebind == 0);
Yann 0:f30e2135b0db 715 /* pcb already in list, just rebind */
Yann 0:f30e2135b0db 716 rebind = 1;
Yann 0:f30e2135b0db 717 }
Yann 0:f30e2135b0db 718
Yann 0:f30e2135b0db 719 /* By default, we don't allow to bind to a port that any other udp
Yann 0:f30e2135b0db 720 PCB is alread bound to, unless *all* PCBs with that port have tha
Yann 0:f30e2135b0db 721 REUSEADDR flag set. */
Yann 0:f30e2135b0db 722 #if SO_REUSE
Yann 0:f30e2135b0db 723 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
Yann 0:f30e2135b0db 724 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
Yann 0:f30e2135b0db 725 #else /* SO_REUSE */
Yann 0:f30e2135b0db 726 /* port matches that of PCB in list and REUSEADDR not set -> reject */
Yann 0:f30e2135b0db 727 else {
Yann 0:f30e2135b0db 728 #endif /* SO_REUSE */
Yann 0:f30e2135b0db 729 if ((ipcb->local_port == port) &&
Yann 0:f30e2135b0db 730 /* IP address matches, or one is IP_ADDR_ANY? */
Yann 0:f30e2135b0db 731 (ip_addr_isany(&(ipcb->local_ip)) ||
Yann 0:f30e2135b0db 732 ip_addr_isany(ipaddr) ||
Yann 0:f30e2135b0db 733 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
Yann 0:f30e2135b0db 734 /* other PCB already binds to this local IP and port */
Yann 0:f30e2135b0db 735 LWIP_DEBUGF(UDP_DEBUG,
Yann 0:f30e2135b0db 736 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
Yann 0:f30e2135b0db 737 return ERR_USE;
Yann 0:f30e2135b0db 738 }
Yann 0:f30e2135b0db 739 }
Yann 0:f30e2135b0db 740 }
Yann 0:f30e2135b0db 741
Yann 0:f30e2135b0db 742 ip_addr_set(&pcb->local_ip, ipaddr);
Yann 0:f30e2135b0db 743
Yann 0:f30e2135b0db 744 /* no port specified? */
Yann 0:f30e2135b0db 745 if (port == 0) {
Yann 0:f30e2135b0db 746 #ifndef UDP_LOCAL_PORT_RANGE_START
Yann 0:f30e2135b0db 747 #define UDP_LOCAL_PORT_RANGE_START 4096
Yann 0:f30e2135b0db 748 #define UDP_LOCAL_PORT_RANGE_END 0x7fff
Yann 0:f30e2135b0db 749 #endif
Yann 0:f30e2135b0db 750 port = UDP_LOCAL_PORT_RANGE_START;
Yann 0:f30e2135b0db 751 ipcb = udp_pcbs;
Yann 0:f30e2135b0db 752 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
Yann 0:f30e2135b0db 753 if (ipcb->local_port == port) {
Yann 0:f30e2135b0db 754 /* port is already used by another udp_pcb */
Yann 0:f30e2135b0db 755 port++;
Yann 0:f30e2135b0db 756 /* restart scanning all udp pcbs */
Yann 0:f30e2135b0db 757 ipcb = udp_pcbs;
Yann 0:f30e2135b0db 758 } else {
Yann 0:f30e2135b0db 759 /* go on with next udp pcb */
Yann 0:f30e2135b0db 760 ipcb = ipcb->next;
Yann 0:f30e2135b0db 761 }
Yann 0:f30e2135b0db 762 }
Yann 0:f30e2135b0db 763 if (ipcb != NULL) {
Yann 0:f30e2135b0db 764 /* no more ports available in local range */
Yann 0:f30e2135b0db 765 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
Yann 0:f30e2135b0db 766 return ERR_USE;
Yann 0:f30e2135b0db 767 }
Yann 0:f30e2135b0db 768 }
Yann 0:f30e2135b0db 769 pcb->local_port = port;
Yann 0:f30e2135b0db 770 snmp_insert_udpidx_tree(pcb);
Yann 0:f30e2135b0db 771 /* pcb not active yet? */
Yann 0:f30e2135b0db 772 if (rebind == 0) {
Yann 0:f30e2135b0db 773 /* place the PCB on the active list if not already there */
Yann 0:f30e2135b0db 774 pcb->next = udp_pcbs;
Yann 0:f30e2135b0db 775 udp_pcbs = pcb;
Yann 0:f30e2135b0db 776 }
Yann 0:f30e2135b0db 777 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
Yann 0:f30e2135b0db 778 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
Yann 0:f30e2135b0db 779 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
Yann 0:f30e2135b0db 780 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
Yann 0:f30e2135b0db 781 pcb->local_port));
Yann 0:f30e2135b0db 782 return ERR_OK;
Yann 0:f30e2135b0db 783 }
Yann 0:f30e2135b0db 784 /**
Yann 0:f30e2135b0db 785 * Connect an UDP PCB.
Yann 0:f30e2135b0db 786 *
Yann 0:f30e2135b0db 787 * This will associate the UDP PCB with the remote address.
Yann 0:f30e2135b0db 788 *
Yann 0:f30e2135b0db 789 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
Yann 0:f30e2135b0db 790 * @param ipaddr remote IP address to connect with.
Yann 0:f30e2135b0db 791 * @param port remote UDP port to connect with.
Yann 0:f30e2135b0db 792 *
Yann 0:f30e2135b0db 793 * @return lwIP error code
Yann 0:f30e2135b0db 794 *
Yann 0:f30e2135b0db 795 * ipaddr & port are expected to be in the same byte order as in the pcb.
Yann 0:f30e2135b0db 796 *
Yann 0:f30e2135b0db 797 * The udp pcb is bound to a random local port if not already bound.
Yann 0:f30e2135b0db 798 *
Yann 0:f30e2135b0db 799 * @see udp_disconnect()
Yann 0:f30e2135b0db 800 */
Yann 0:f30e2135b0db 801 err_t
Yann 0:f30e2135b0db 802 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
Yann 0:f30e2135b0db 803 {
Yann 0:f30e2135b0db 804 struct udp_pcb *ipcb;
Yann 0:f30e2135b0db 805
Yann 0:f30e2135b0db 806 if (pcb->local_port == 0) {
Yann 0:f30e2135b0db 807 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
Yann 0:f30e2135b0db 808 if (err != ERR_OK) {
Yann 0:f30e2135b0db 809 return err;
Yann 0:f30e2135b0db 810 }
Yann 0:f30e2135b0db 811 }
Yann 0:f30e2135b0db 812
Yann 0:f30e2135b0db 813 ip_addr_set(&pcb->remote_ip, ipaddr);
Yann 0:f30e2135b0db 814 pcb->remote_port = port;
Yann 0:f30e2135b0db 815 pcb->flags |= UDP_FLAGS_CONNECTED;
Yann 0:f30e2135b0db 816 /** TODO: this functionality belongs in upper layers */
Yann 0:f30e2135b0db 817 #ifdef LWIP_UDP_TODO
Yann 0:f30e2135b0db 818 /* Nail down local IP for netconn_addr()/getsockname() */
Yann 0:f30e2135b0db 819 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
Yann 0:f30e2135b0db 820 struct netif *netif;
Yann 0:f30e2135b0db 821
Yann 0:f30e2135b0db 822 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
Yann 0:f30e2135b0db 823 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
Yann 0:f30e2135b0db 824 UDP_STATS_INC(udp.rterr);
Yann 0:f30e2135b0db 825 return ERR_RTE;
Yann 0:f30e2135b0db 826 }
Yann 0:f30e2135b0db 827 /** TODO: this will bind the udp pcb locally, to the interface which
Yann 0:f30e2135b0db 828 is used to route output packets to the remote address. However, we
Yann 0:f30e2135b0db 829 might want to accept incoming packets on any interface! */
Yann 0:f30e2135b0db 830 pcb->local_ip = netif->ip_addr;
Yann 0:f30e2135b0db 831 } else if (ip_addr_isany(&pcb->remote_ip)) {
Yann 0:f30e2135b0db 832 pcb->local_ip.addr = 0;
Yann 0:f30e2135b0db 833 }
Yann 0:f30e2135b0db 834 #endif
Yann 0:f30e2135b0db 835 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
Yann 0:f30e2135b0db 836 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
Yann 0:f30e2135b0db 837 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
Yann 0:f30e2135b0db 838 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
Yann 0:f30e2135b0db 839 pcb->local_port));
Yann 0:f30e2135b0db 840
Yann 0:f30e2135b0db 841 /* Insert UDP PCB into the list of active UDP PCBs. */
Yann 0:f30e2135b0db 842 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
Yann 0:f30e2135b0db 843 if (pcb == ipcb) {
Yann 0:f30e2135b0db 844 /* already on the list, just return */
Yann 0:f30e2135b0db 845 return ERR_OK;
Yann 0:f30e2135b0db 846 }
Yann 0:f30e2135b0db 847 }
Yann 0:f30e2135b0db 848 /* PCB not yet on the list, add PCB now */
Yann 0:f30e2135b0db 849 pcb->next = udp_pcbs;
Yann 0:f30e2135b0db 850 udp_pcbs = pcb;
Yann 0:f30e2135b0db 851 return ERR_OK;
Yann 0:f30e2135b0db 852 }
Yann 0:f30e2135b0db 853
Yann 0:f30e2135b0db 854 /**
Yann 0:f30e2135b0db 855 * Disconnect a UDP PCB
Yann 0:f30e2135b0db 856 *
Yann 0:f30e2135b0db 857 * @param pcb the udp pcb to disconnect.
Yann 0:f30e2135b0db 858 */
Yann 0:f30e2135b0db 859 void
Yann 0:f30e2135b0db 860 udp_disconnect(struct udp_pcb *pcb)
Yann 0:f30e2135b0db 861 {
Yann 0:f30e2135b0db 862 /* reset remote address association */
Yann 0:f30e2135b0db 863 ip_addr_set_any(&pcb->remote_ip);
Yann 0:f30e2135b0db 864 pcb->remote_port = 0;
Yann 0:f30e2135b0db 865 /* mark PCB as unconnected */
Yann 0:f30e2135b0db 866 pcb->flags &= ~UDP_FLAGS_CONNECTED;
Yann 0:f30e2135b0db 867 }
Yann 0:f30e2135b0db 868
Yann 0:f30e2135b0db 869 /**
Yann 0:f30e2135b0db 870 * Set a receive callback for a UDP PCB
Yann 0:f30e2135b0db 871 *
Yann 0:f30e2135b0db 872 * This callback will be called when receiving a datagram for the pcb.
Yann 0:f30e2135b0db 873 *
Yann 0:f30e2135b0db 874 * @param pcb the pcb for wich to set the recv callback
Yann 0:f30e2135b0db 875 * @param recv function pointer of the callback function
Yann 0:f30e2135b0db 876 * @param recv_arg additional argument to pass to the callback function
Yann 0:f30e2135b0db 877 */
Yann 0:f30e2135b0db 878 void
Yann 0:f30e2135b0db 879 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
Yann 0:f30e2135b0db 880 {
Yann 0:f30e2135b0db 881 /* remember recv() callback and user data */
Yann 0:f30e2135b0db 882 pcb->recv = recv;
Yann 0:f30e2135b0db 883 pcb->recv_arg = recv_arg;
Yann 0:f30e2135b0db 884 }
Yann 0:f30e2135b0db 885
Yann 0:f30e2135b0db 886 /**
Yann 0:f30e2135b0db 887 * Remove an UDP PCB.
Yann 0:f30e2135b0db 888 *
Yann 0:f30e2135b0db 889 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
Yann 0:f30e2135b0db 890 * UDP PCB's and the data structure is freed from memory.
Yann 0:f30e2135b0db 891 *
Yann 0:f30e2135b0db 892 * @see udp_new()
Yann 0:f30e2135b0db 893 */
Yann 0:f30e2135b0db 894 void
Yann 0:f30e2135b0db 895 udp_remove(struct udp_pcb *pcb)
Yann 0:f30e2135b0db 896 {
Yann 0:f30e2135b0db 897 struct udp_pcb *pcb2;
Yann 0:f30e2135b0db 898
Yann 0:f30e2135b0db 899 snmp_delete_udpidx_tree(pcb);
Yann 0:f30e2135b0db 900 /* pcb to be removed is first in list? */
Yann 0:f30e2135b0db 901 if (udp_pcbs == pcb) {
Yann 0:f30e2135b0db 902 /* make list start at 2nd pcb */
Yann 0:f30e2135b0db 903 udp_pcbs = udp_pcbs->next;
Yann 0:f30e2135b0db 904 /* pcb not 1st in list */
Yann 0:f30e2135b0db 905 } else {
Yann 0:f30e2135b0db 906 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
Yann 0:f30e2135b0db 907 /* find pcb in udp_pcbs list */
Yann 0:f30e2135b0db 908 if (pcb2->next != NULL && pcb2->next == pcb) {
Yann 0:f30e2135b0db 909 /* remove pcb from list */
Yann 0:f30e2135b0db 910 pcb2->next = pcb->next;
Yann 0:f30e2135b0db 911 }
Yann 0:f30e2135b0db 912 }
Yann 0:f30e2135b0db 913 }
Yann 0:f30e2135b0db 914 memp_free(MEMP_UDP_PCB, pcb);
Yann 0:f30e2135b0db 915 }
Yann 0:f30e2135b0db 916
Yann 0:f30e2135b0db 917 /**
Yann 0:f30e2135b0db 918 * Create a UDP PCB.
Yann 0:f30e2135b0db 919 *
Yann 0:f30e2135b0db 920 * @return The UDP PCB which was created. NULL if the PCB data structure
Yann 0:f30e2135b0db 921 * could not be allocated.
Yann 0:f30e2135b0db 922 *
Yann 0:f30e2135b0db 923 * @see udp_remove()
Yann 0:f30e2135b0db 924 */
Yann 0:f30e2135b0db 925 struct udp_pcb *
Yann 0:f30e2135b0db 926 udp_new(void)
Yann 0:f30e2135b0db 927 {
Yann 0:f30e2135b0db 928 struct udp_pcb *pcb;
Yann 0:f30e2135b0db 929 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
Yann 0:f30e2135b0db 930 /* could allocate UDP PCB? */
Yann 0:f30e2135b0db 931 if (pcb != NULL) {
Yann 0:f30e2135b0db 932 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
Yann 0:f30e2135b0db 933 * which means checksum is generated over the whole datagram per default
Yann 0:f30e2135b0db 934 * (recommended as default by RFC 3828). */
Yann 0:f30e2135b0db 935 /* initialize PCB to all zeroes */
Yann 0:f30e2135b0db 936 memset(pcb, 0, sizeof(struct udp_pcb));
Yann 0:f30e2135b0db 937 pcb->ttl = UDP_TTL;
Yann 0:f30e2135b0db 938 }
Yann 0:f30e2135b0db 939 return pcb;
Yann 0:f30e2135b0db 940 }
Yann 0:f30e2135b0db 941
Yann 0:f30e2135b0db 942 #if UDP_DEBUG
Yann 0:f30e2135b0db 943 /**
Yann 0:f30e2135b0db 944 * Print UDP header information for debug purposes.
Yann 0:f30e2135b0db 945 *
Yann 0:f30e2135b0db 946 * @param udphdr pointer to the udp header in memory.
Yann 0:f30e2135b0db 947 */
Yann 0:f30e2135b0db 948 void
Yann 0:f30e2135b0db 949 udp_debug_print(struct udp_hdr *udphdr)
Yann 0:f30e2135b0db 950 {
Yann 0:f30e2135b0db 951 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
Yann 0:f30e2135b0db 952 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
Yann 0:f30e2135b0db 953 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
Yann 0:f30e2135b0db 954 ntohs(udphdr->src), ntohs(udphdr->dest)));
Yann 0:f30e2135b0db 955 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
Yann 0:f30e2135b0db 956 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
Yann 0:f30e2135b0db 957 ntohs(udphdr->len), ntohs(udphdr->chksum)));
Yann 0:f30e2135b0db 958 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
Yann 0:f30e2135b0db 959 }
Yann 0:f30e2135b0db 960 #endif /* UDP_DEBUG */
Yann 0:f30e2135b0db 961
Yann 0:f30e2135b0db 962 #endif /* LWIP_UDP */