Pascal Nysten / lwip

Adapted to Lora Semtech + Nucleo

Dependencies:   DebugLib

Dependents:   LoRaWAN-lmic-app LoRaWAN-lmic-app LoRaWAN-test-10secs LoRaPersonalizedDeviceForEverynet ... more

Fork of lwip_ppp_ethernet by Donatien Garnier

src/core/udp.c@0:8e01dca41002, 2012-05-24 (annotated)

Committer:
donatien
Date:
Thu May 24 15:53:48 2012 +0000
Revision:
0:8e01dca41002
Merge with Emilio's LwIp

Who changed what in which revision?

UserRevisionLine numberNew contents of line
donatien 0:8e01dca41002 1 /**
donatien 0:8e01dca41002 2 * @file
donatien 0:8e01dca41002 3 * User Datagram Protocol module
donatien 0:8e01dca41002 4 *
donatien 0:8e01dca41002 5 */
donatien 0:8e01dca41002 6
donatien 0:8e01dca41002 7 /*
donatien 0:8e01dca41002 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
donatien 0:8e01dca41002 9 * All rights reserved.
donatien 0:8e01dca41002 10 *
donatien 0:8e01dca41002 11 * Redistribution and use in source and binary forms, with or without modification,
donatien 0:8e01dca41002 12 * are permitted provided that the following conditions are met:
donatien 0:8e01dca41002 13 *
donatien 0:8e01dca41002 14 * 1. Redistributions of source code must retain the above copyright notice,
donatien 0:8e01dca41002 15 * this list of conditions and the following disclaimer.
donatien 0:8e01dca41002 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
donatien 0:8e01dca41002 17 * this list of conditions and the following disclaimer in the documentation
donatien 0:8e01dca41002 18 * and/or other materials provided with the distribution.
donatien 0:8e01dca41002 19 * 3. The name of the author may not be used to endorse or promote products
donatien 0:8e01dca41002 20 * derived from this software without specific prior written permission.
donatien 0:8e01dca41002 21 *
donatien 0:8e01dca41002 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien 0:8e01dca41002 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien 0:8e01dca41002 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien 0:8e01dca41002 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien 0:8e01dca41002 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien 0:8e01dca41002 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien 0:8e01dca41002 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien 0:8e01dca41002 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien 0:8e01dca41002 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien 0:8e01dca41002 31 * OF SUCH DAMAGE.
donatien 0:8e01dca41002 32 *
donatien 0:8e01dca41002 33 * This file is part of the lwIP TCP/IP stack.
donatien 0:8e01dca41002 34 *
donatien 0:8e01dca41002 35 * Author: Adam Dunkels <adam@sics.se>
donatien 0:8e01dca41002 36 *
donatien 0:8e01dca41002 37 */
donatien 0:8e01dca41002 38
donatien 0:8e01dca41002 39
donatien 0:8e01dca41002 40 /* udp.c
donatien 0:8e01dca41002 41 *
donatien 0:8e01dca41002 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
donatien 0:8e01dca41002 43 *
donatien 0:8e01dca41002 44 */
donatien 0:8e01dca41002 45
donatien 0:8e01dca41002 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
donatien 0:8e01dca41002 47 */
donatien 0:8e01dca41002 48
donatien 0:8e01dca41002 49 #include "lwip/opt.h"
donatien 0:8e01dca41002 50
donatien 0:8e01dca41002 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
donatien 0:8e01dca41002 52
donatien 0:8e01dca41002 53 #include "lwip/udp.h"
donatien 0:8e01dca41002 54 #include "lwip/def.h"
donatien 0:8e01dca41002 55 #include "lwip/memp.h"
donatien 0:8e01dca41002 56 #include "lwip/inet_chksum.h"
donatien 0:8e01dca41002 57 #include "lwip/ip_addr.h"
donatien 0:8e01dca41002 58 #include "lwip/netif.h"
donatien 0:8e01dca41002 59 #include "lwip/icmp.h"
donatien 0:8e01dca41002 60 #include "lwip/stats.h"
donatien 0:8e01dca41002 61 #include "lwip/snmp.h"
donatien 0:8e01dca41002 62 #include "arch/perf.h"
donatien 0:8e01dca41002 63 #include "lwip/dhcp.h"
donatien 0:8e01dca41002 64
donatien 0:8e01dca41002 65 #include <string.h>
donatien 0:8e01dca41002 66
donatien 0:8e01dca41002 67 /* The list of UDP PCBs */
donatien 0:8e01dca41002 68 /* exported in udp.h (was static) */
donatien 0:8e01dca41002 69 struct udp_pcb *udp_pcbs;
donatien 0:8e01dca41002 70
donatien 0:8e01dca41002 71 /**
donatien 0:8e01dca41002 72 * Process an incoming UDP datagram.
donatien 0:8e01dca41002 73 *
donatien 0:8e01dca41002 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
donatien 0:8e01dca41002 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
donatien 0:8e01dca41002 76 * recv function. If no pcb is found or the datagram is incorrect, the
donatien 0:8e01dca41002 77 * pbuf is freed.
donatien 0:8e01dca41002 78 *
donatien 0:8e01dca41002 79 * @param p pbuf to be demultiplexed to a UDP PCB.
donatien 0:8e01dca41002 80 * @param inp network interface on which the datagram was received.
donatien 0:8e01dca41002 81 *
donatien 0:8e01dca41002 82 */
donatien 0:8e01dca41002 83 void
donatien 0:8e01dca41002 84 udp_input(struct pbuf *p, struct netif *inp)
donatien 0:8e01dca41002 85 {
donatien 0:8e01dca41002 86 struct udp_hdr *udphdr;
donatien 0:8e01dca41002 87 struct udp_pcb *pcb, *prev;
donatien 0:8e01dca41002 88 struct udp_pcb *uncon_pcb;
donatien 0:8e01dca41002 89 struct ip_hdr *iphdr;
donatien 0:8e01dca41002 90 u16_t src, dest;
donatien 0:8e01dca41002 91 u8_t local_match;
donatien 0:8e01dca41002 92 u8_t broadcast;
donatien 0:8e01dca41002 93
donatien 0:8e01dca41002 94 PERF_START;
donatien 0:8e01dca41002 95
donatien 0:8e01dca41002 96 UDP_STATS_INC(udp.recv);
donatien 0:8e01dca41002 97
donatien 0:8e01dca41002 98 iphdr = (struct ip_hdr *)p->payload;
donatien 0:8e01dca41002 99
donatien 0:8e01dca41002 100 /* Check minimum length (IP header + UDP header)
donatien 0:8e01dca41002 101 * and move payload pointer to UDP header */
donatien 0:8e01dca41002 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
donatien 0:8e01dca41002 103 /* drop short packets */
donatien 0:8e01dca41002 104 LWIP_DEBUGF(UDP_DEBUG,
donatien 0:8e01dca41002 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
donatien 0:8e01dca41002 106 UDP_STATS_INC(udp.lenerr);
donatien 0:8e01dca41002 107 UDP_STATS_INC(udp.drop);
donatien 0:8e01dca41002 108 snmp_inc_udpinerrors();
donatien 0:8e01dca41002 109 pbuf_free(p);
donatien 0:8e01dca41002 110 goto end;
donatien 0:8e01dca41002 111 }
donatien 0:8e01dca41002 112
donatien 0:8e01dca41002 113 udphdr = (struct udp_hdr *)p->payload;
donatien 0:8e01dca41002 114
donatien 0:8e01dca41002 115 /* is broadcast packet ? */
donatien 0:8e01dca41002 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
donatien 0:8e01dca41002 117
donatien 0:8e01dca41002 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
donatien 0:8e01dca41002 119
donatien 0:8e01dca41002 120 /* convert src and dest ports to host byte order */
donatien 0:8e01dca41002 121 src = ntohs(udphdr->src);
donatien 0:8e01dca41002 122 dest = ntohs(udphdr->dest);
donatien 0:8e01dca41002 123
donatien 0:8e01dca41002 124 udp_debug_print(udphdr);
donatien 0:8e01dca41002 125
donatien 0:8e01dca41002 126 /* print the UDP source and destination */
donatien 0:8e01dca41002 127 LWIP_DEBUGF(UDP_DEBUG,
donatien 0:8e01dca41002 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
donatien 0:8e01dca41002 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
donatien 0:8e01dca41002 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
donatien 0:8e01dca41002 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
donatien 0:8e01dca41002 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
donatien 0:8e01dca41002 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
donatien 0:8e01dca41002 134
donatien 0:8e01dca41002 135 #if LWIP_DHCP
donatien 0:8e01dca41002 136 pcb = NULL;
donatien 0:8e01dca41002 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
donatien 0:8e01dca41002 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
donatien 0:8e01dca41002 139 if (dest == DHCP_CLIENT_PORT) {
donatien 0:8e01dca41002 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
donatien 0:8e01dca41002 141 if (src == DHCP_SERVER_PORT) {
donatien 0:8e01dca41002 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
donatien 0:8e01dca41002 143 /* accept the packe if
donatien 0:8e01dca41002 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
donatien 0:8e01dca41002 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
donatien 0:8e01dca41002 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
donatien 0:8e01dca41002 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
donatien 0:8e01dca41002 148 pcb = inp->dhcp->pcb;
donatien 0:8e01dca41002 149 }
donatien 0:8e01dca41002 150 }
donatien 0:8e01dca41002 151 }
donatien 0:8e01dca41002 152 } else
donatien 0:8e01dca41002 153 #endif /* LWIP_DHCP */
donatien 0:8e01dca41002 154 {
donatien 0:8e01dca41002 155 prev = NULL;
donatien 0:8e01dca41002 156 local_match = 0;
donatien 0:8e01dca41002 157 uncon_pcb = NULL;
donatien 0:8e01dca41002 158 /* Iterate through the UDP pcb list for a matching pcb.
donatien 0:8e01dca41002 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
donatien 0:8e01dca41002 160 * preferred. If no perfect match is found, the first unconnected pcb that
donatien 0:8e01dca41002 161 * matches the local port and ip address gets the datagram. */
donatien 0:8e01dca41002 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
donatien 0:8e01dca41002 163 local_match = 0;
donatien 0:8e01dca41002 164 /* print the PCB local and remote address */
donatien 0:8e01dca41002 165 LWIP_DEBUGF(UDP_DEBUG,
donatien 0:8e01dca41002 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
donatien 0:8e01dca41002 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
donatien 0:8e01dca41002 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien 0:8e01dca41002 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
donatien 0:8e01dca41002 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
donatien 0:8e01dca41002 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
donatien 0:8e01dca41002 172
donatien 0:8e01dca41002 173 /* compare PCB local addr+port to UDP destination addr+port */
donatien 0:8e01dca41002 174 if ((pcb->local_port == dest) &&
donatien 0:8e01dca41002 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
donatien 0:8e01dca41002 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
donatien 0:8e01dca41002 177 #if LWIP_IGMP
donatien 0:8e01dca41002 178 ip_addr_ismulticast(&current_iphdr_dest) ||
donatien 0:8e01dca41002 179 #endif /* LWIP_IGMP */
donatien 0:8e01dca41002 180 #if IP_SOF_BROADCAST_RECV
donatien 0:8e01dca41002 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
donatien 0:8e01dca41002 182 #else /* IP_SOF_BROADCAST_RECV */
donatien 0:8e01dca41002 183 (broadcast))) {
donatien 0:8e01dca41002 184 #endif /* IP_SOF_BROADCAST_RECV */
donatien 0:8e01dca41002 185 local_match = 1;
donatien 0:8e01dca41002 186 if ((uncon_pcb == NULL) &&
donatien 0:8e01dca41002 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
donatien 0:8e01dca41002 188 /* the first unconnected matching PCB */
donatien 0:8e01dca41002 189 uncon_pcb = pcb;
donatien 0:8e01dca41002 190 }
donatien 0:8e01dca41002 191 }
donatien 0:8e01dca41002 192 /* compare PCB remote addr+port to UDP source addr+port */
donatien 0:8e01dca41002 193 if ((local_match != 0) &&
donatien 0:8e01dca41002 194 (pcb->remote_port == src) &&
donatien 0:8e01dca41002 195 (ip_addr_isany(&pcb->remote_ip) ||
donatien 0:8e01dca41002 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
donatien 0:8e01dca41002 197 /* the first fully matching PCB */
donatien 0:8e01dca41002 198 if (prev != NULL) {
donatien 0:8e01dca41002 199 /* move the pcb to the front of udp_pcbs so that is
donatien 0:8e01dca41002 200 found faster next time */
donatien 0:8e01dca41002 201 prev->next = pcb->next;
donatien 0:8e01dca41002 202 pcb->next = udp_pcbs;
donatien 0:8e01dca41002 203 udp_pcbs = pcb;
donatien 0:8e01dca41002 204 } else {
donatien 0:8e01dca41002 205 UDP_STATS_INC(udp.cachehit);
donatien 0:8e01dca41002 206 }
donatien 0:8e01dca41002 207 break;
donatien 0:8e01dca41002 208 }
donatien 0:8e01dca41002 209 prev = pcb;
donatien 0:8e01dca41002 210 }
donatien 0:8e01dca41002 211 /* no fully matching pcb found? then look for an unconnected pcb */
donatien 0:8e01dca41002 212 if (pcb == NULL) {
donatien 0:8e01dca41002 213 pcb = uncon_pcb;
donatien 0:8e01dca41002 214 }
donatien 0:8e01dca41002 215 }
donatien 0:8e01dca41002 216
donatien 0:8e01dca41002 217 /* Check checksum if this is a match or if it was directed at us. */
donatien 0:8e01dca41002 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
donatien 0:8e01dca41002 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
donatien 0:8e01dca41002 220 #if LWIP_UDPLITE
donatien 0:8e01dca41002 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
donatien 0:8e01dca41002 222 /* Do the UDP Lite checksum */
donatien 0:8e01dca41002 223 #if CHECKSUM_CHECK_UDP
donatien 0:8e01dca41002 224 u16_t chklen = ntohs(udphdr->len);
donatien 0:8e01dca41002 225 if (chklen < sizeof(struct udp_hdr)) {
donatien 0:8e01dca41002 226 if (chklen == 0) {
donatien 0:8e01dca41002 227 /* For UDP-Lite, checksum length of 0 means checksum
donatien 0:8e01dca41002 228 over the complete packet (See RFC 3828 chap. 3.1) */
donatien 0:8e01dca41002 229 chklen = p->tot_len;
donatien 0:8e01dca41002 230 } else {
donatien 0:8e01dca41002 231 /* At least the UDP-Lite header must be covered by the
donatien 0:8e01dca41002 232 checksum! (Again, see RFC 3828 chap. 3.1) */
donatien 0:8e01dca41002 233 UDP_STATS_INC(udp.chkerr);
donatien 0:8e01dca41002 234 UDP_STATS_INC(udp.drop);
donatien 0:8e01dca41002 235 snmp_inc_udpinerrors();
donatien 0:8e01dca41002 236 pbuf_free(p);
donatien 0:8e01dca41002 237 goto end;
donatien 0:8e01dca41002 238 }
donatien 0:8e01dca41002 239 }
donatien 0:8e01dca41002 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
donatien 0:8e01dca41002 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
donatien 0:8e01dca41002 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
donatien 0:8e01dca41002 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
donatien 0:8e01dca41002 244 UDP_STATS_INC(udp.chkerr);
donatien 0:8e01dca41002 245 UDP_STATS_INC(udp.drop);
donatien 0:8e01dca41002 246 snmp_inc_udpinerrors();
donatien 0:8e01dca41002 247 pbuf_free(p);
donatien 0:8e01dca41002 248 goto end;
donatien 0:8e01dca41002 249 }
donatien 0:8e01dca41002 250 #endif /* CHECKSUM_CHECK_UDP */
donatien 0:8e01dca41002 251 } else
donatien 0:8e01dca41002 252 #endif /* LWIP_UDPLITE */
donatien 0:8e01dca41002 253 {
donatien 0:8e01dca41002 254 #if CHECKSUM_CHECK_UDP
donatien 0:8e01dca41002 255 if (udphdr->chksum != 0) {
donatien 0:8e01dca41002 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
donatien 0:8e01dca41002 257 IP_PROTO_UDP, p->tot_len) != 0) {
donatien 0:8e01dca41002 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
donatien 0:8e01dca41002 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
donatien 0:8e01dca41002 260 UDP_STATS_INC(udp.chkerr);
donatien 0:8e01dca41002 261 UDP_STATS_INC(udp.drop);
donatien 0:8e01dca41002 262 snmp_inc_udpinerrors();
donatien 0:8e01dca41002 263 pbuf_free(p);
donatien 0:8e01dca41002 264 goto end;
donatien 0:8e01dca41002 265 }
donatien 0:8e01dca41002 266 }
donatien 0:8e01dca41002 267 #endif /* CHECKSUM_CHECK_UDP */
donatien 0:8e01dca41002 268 }
donatien 0:8e01dca41002 269 if(pbuf_header(p, -UDP_HLEN)) {
donatien 0:8e01dca41002 270 /* Can we cope with this failing? Just assert for now */
donatien 0:8e01dca41002 271 LWIP_ASSERT("pbuf_header failed\n", 0);
donatien 0:8e01dca41002 272 UDP_STATS_INC(udp.drop);
donatien 0:8e01dca41002 273 snmp_inc_udpinerrors();
donatien 0:8e01dca41002 274 pbuf_free(p);
donatien 0:8e01dca41002 275 goto end;
donatien 0:8e01dca41002 276 }
donatien 0:8e01dca41002 277 if (pcb != NULL) {
donatien 0:8e01dca41002 278 snmp_inc_udpindatagrams();
donatien 0:8e01dca41002 279 #if SO_REUSE && SO_REUSE_RXTOALL
donatien 0:8e01dca41002 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
donatien 0:8e01dca41002 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
donatien 0:8e01dca41002 282 /* pass broadcast- or multicast packets to all multicast pcbs
donatien 0:8e01dca41002 283 if SOF_REUSEADDR is set on the first match */
donatien 0:8e01dca41002 284 struct udp_pcb *mpcb;
donatien 0:8e01dca41002 285 u8_t p_header_changed = 0;
donatien 0:8e01dca41002 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
donatien 0:8e01dca41002 287 if (mpcb != pcb) {
donatien 0:8e01dca41002 288 /* compare PCB local addr+port to UDP destination addr+port */
donatien 0:8e01dca41002 289 if ((mpcb->local_port == dest) &&
donatien 0:8e01dca41002 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
donatien 0:8e01dca41002 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
donatien 0:8e01dca41002 292 #if LWIP_IGMP
donatien 0:8e01dca41002 293 ip_addr_ismulticast(&current_iphdr_dest) ||
donatien 0:8e01dca41002 294 #endif /* LWIP_IGMP */
donatien 0:8e01dca41002 295 #if IP_SOF_BROADCAST_RECV
donatien 0:8e01dca41002 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
donatien 0:8e01dca41002 297 #else /* IP_SOF_BROADCAST_RECV */
donatien 0:8e01dca41002 298 (broadcast))) {
donatien 0:8e01dca41002 299 #endif /* IP_SOF_BROADCAST_RECV */
donatien 0:8e01dca41002 300 /* pass a copy of the packet to all local matches */
donatien 0:8e01dca41002 301 if (mpcb->recv != NULL) {
donatien 0:8e01dca41002 302 struct pbuf *q;
donatien 0:8e01dca41002 303 /* for that, move payload to IP header again */
donatien 0:8e01dca41002 304 if (p_header_changed == 0) {
donatien 0:8e01dca41002 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
donatien 0:8e01dca41002 306 p_header_changed = 1;
donatien 0:8e01dca41002 307 }
donatien 0:8e01dca41002 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
donatien 0:8e01dca41002 309 if (q != NULL) {
donatien 0:8e01dca41002 310 err_t err = pbuf_copy(q, p);
donatien 0:8e01dca41002 311 if (err == ERR_OK) {
donatien 0:8e01dca41002 312 /* move payload to UDP data */
donatien 0:8e01dca41002 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
donatien 0:8e01dca41002 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
donatien 0:8e01dca41002 315 }
donatien 0:8e01dca41002 316 }
donatien 0:8e01dca41002 317 }
donatien 0:8e01dca41002 318 }
donatien 0:8e01dca41002 319 }
donatien 0:8e01dca41002 320 }
donatien 0:8e01dca41002 321 if (p_header_changed) {
donatien 0:8e01dca41002 322 /* and move payload to UDP data again */
donatien 0:8e01dca41002 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
donatien 0:8e01dca41002 324 }
donatien 0:8e01dca41002 325 }
donatien 0:8e01dca41002 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
donatien 0:8e01dca41002 327 /* callback */
donatien 0:8e01dca41002 328 if (pcb->recv != NULL) {
donatien 0:8e01dca41002 329 /* now the recv function is responsible for freeing p */
donatien 0:8e01dca41002 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
donatien 0:8e01dca41002 331 } else {
donatien 0:8e01dca41002 332 /* no recv function registered? then we have to free the pbuf! */
donatien 0:8e01dca41002 333 pbuf_free(p);
donatien 0:8e01dca41002 334 goto end;
donatien 0:8e01dca41002 335 }
donatien 0:8e01dca41002 336 } else {
donatien 0:8e01dca41002 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
donatien 0:8e01dca41002 338
donatien 0:8e01dca41002 339 #if LWIP_ICMP
donatien 0:8e01dca41002 340 /* No match was found, send ICMP destination port unreachable unless
donatien 0:8e01dca41002 341 destination address was broadcast/multicast. */
donatien 0:8e01dca41002 342 if (!broadcast &&
donatien 0:8e01dca41002 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
donatien 0:8e01dca41002 344 /* move payload pointer back to ip header */
donatien 0:8e01dca41002 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
donatien 0:8e01dca41002 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
donatien 0:8e01dca41002 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
donatien 0:8e01dca41002 348 }
donatien 0:8e01dca41002 349 #endif /* LWIP_ICMP */
donatien 0:8e01dca41002 350 UDP_STATS_INC(udp.proterr);
donatien 0:8e01dca41002 351 UDP_STATS_INC(udp.drop);
donatien 0:8e01dca41002 352 snmp_inc_udpnoports();
donatien 0:8e01dca41002 353 pbuf_free(p);
donatien 0:8e01dca41002 354 }
donatien 0:8e01dca41002 355 } else {
donatien 0:8e01dca41002 356 pbuf_free(p);
donatien 0:8e01dca41002 357 }
donatien 0:8e01dca41002 358 end:
donatien 0:8e01dca41002 359 PERF_STOP("udp_input");
donatien 0:8e01dca41002 360 }
donatien 0:8e01dca41002 361
donatien 0:8e01dca41002 362 /**
donatien 0:8e01dca41002 363 * Send data using UDP.
donatien 0:8e01dca41002 364 *
donatien 0:8e01dca41002 365 * @param pcb UDP PCB used to send the data.
donatien 0:8e01dca41002 366 * @param p chain of pbuf's to be sent.
donatien 0:8e01dca41002 367 *
donatien 0:8e01dca41002 368 * The datagram will be sent to the current remote_ip & remote_port
donatien 0:8e01dca41002 369 * stored in pcb. If the pcb is not bound to a port, it will
donatien 0:8e01dca41002 370 * automatically be bound to a random port.
donatien 0:8e01dca41002 371 *
donatien 0:8e01dca41002 372 * @return lwIP error code.
donatien 0:8e01dca41002 373 * - ERR_OK. Successful. No error occured.
donatien 0:8e01dca41002 374 * - ERR_MEM. Out of memory.
donatien 0:8e01dca41002 375 * - ERR_RTE. Could not find route to destination address.
donatien 0:8e01dca41002 376 * - More errors could be returned by lower protocol layers.
donatien 0:8e01dca41002 377 *
donatien 0:8e01dca41002 378 * @see udp_disconnect() udp_sendto()
donatien 0:8e01dca41002 379 */
donatien 0:8e01dca41002 380 err_t
donatien 0:8e01dca41002 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
donatien 0:8e01dca41002 382 {
donatien 0:8e01dca41002 383 /* send to the packet using remote ip and port stored in the pcb */
donatien 0:8e01dca41002 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
donatien 0:8e01dca41002 385 }
donatien 0:8e01dca41002 386
donatien 0:8e01dca41002 387 #if LWIP_CHECKSUM_ON_COPY
donatien 0:8e01dca41002 388 /** Same as udp_send() but with checksum
donatien 0:8e01dca41002 389 */
donatien 0:8e01dca41002 390 err_t
donatien 0:8e01dca41002 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
donatien 0:8e01dca41002 392 u8_t have_chksum, u16_t chksum)
donatien 0:8e01dca41002 393 {
donatien 0:8e01dca41002 394 /* send to the packet using remote ip and port stored in the pcb */
donatien 0:8e01dca41002 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
donatien 0:8e01dca41002 396 have_chksum, chksum);
donatien 0:8e01dca41002 397 }
donatien 0:8e01dca41002 398 #endif /* LWIP_CHECKSUM_ON_COPY */
donatien 0:8e01dca41002 399
donatien 0:8e01dca41002 400 /**
donatien 0:8e01dca41002 401 * Send data to a specified address using UDP.
donatien 0:8e01dca41002 402 *
donatien 0:8e01dca41002 403 * @param pcb UDP PCB used to send the data.
donatien 0:8e01dca41002 404 * @param p chain of pbuf's to be sent.
donatien 0:8e01dca41002 405 * @param dst_ip Destination IP address.
donatien 0:8e01dca41002 406 * @param dst_port Destination UDP port.
donatien 0:8e01dca41002 407 *
donatien 0:8e01dca41002 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
donatien 0:8e01dca41002 409 *
donatien 0:8e01dca41002 410 * If the PCB already has a remote address association, it will
donatien 0:8e01dca41002 411 * be restored after the data is sent.
donatien 0:8e01dca41002 412 *
donatien 0:8e01dca41002 413 * @return lwIP error code (@see udp_send for possible error codes)
donatien 0:8e01dca41002 414 *
donatien 0:8e01dca41002 415 * @see udp_disconnect() udp_send()
donatien 0:8e01dca41002 416 */
donatien 0:8e01dca41002 417 err_t
donatien 0:8e01dca41002 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
donatien 0:8e01dca41002 419 ip_addr_t *dst_ip, u16_t dst_port)
donatien 0:8e01dca41002 420 {
donatien 0:8e01dca41002 421 #if LWIP_CHECKSUM_ON_COPY
donatien 0:8e01dca41002 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
donatien 0:8e01dca41002 423 }
donatien 0:8e01dca41002 424
donatien 0:8e01dca41002 425 /** Same as udp_sendto(), but with checksum */
donatien 0:8e01dca41002 426 err_t
donatien 0:8e01dca41002 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
donatien 0:8e01dca41002 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
donatien 0:8e01dca41002 429 {
donatien 0:8e01dca41002 430 #endif /* LWIP_CHECKSUM_ON_COPY */
donatien 0:8e01dca41002 431 struct netif *netif;
donatien 0:8e01dca41002 432
donatien 0:8e01dca41002 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
donatien 0:8e01dca41002 434
donatien 0:8e01dca41002 435 /* find the outgoing network interface for this packet */
donatien 0:8e01dca41002 436 #if LWIP_IGMP
donatien 0:8e01dca41002 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
donatien 0:8e01dca41002 438 #else
donatien 0:8e01dca41002 439 netif = ip_route(dst_ip);
donatien 0:8e01dca41002 440 #endif /* LWIP_IGMP */
donatien 0:8e01dca41002 441
donatien 0:8e01dca41002 442 /* no outgoing network interface could be found? */
donatien 0:8e01dca41002 443 if (netif == NULL) {
donatien 0:8e01dca41002 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
donatien 0:8e01dca41002 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
donatien 0:8e01dca41002 446 UDP_STATS_INC(udp.rterr);
donatien 0:8e01dca41002 447 return ERR_RTE;
donatien 0:8e01dca41002 448 }
donatien 0:8e01dca41002 449 #if LWIP_CHECKSUM_ON_COPY
donatien 0:8e01dca41002 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
donatien 0:8e01dca41002 451 #else /* LWIP_CHECKSUM_ON_COPY */
donatien 0:8e01dca41002 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
donatien 0:8e01dca41002 453 #endif /* LWIP_CHECKSUM_ON_COPY */
donatien 0:8e01dca41002 454 }
donatien 0:8e01dca41002 455
donatien 0:8e01dca41002 456 /**
donatien 0:8e01dca41002 457 * Send data to a specified address using UDP.
donatien 0:8e01dca41002 458 * The netif used for sending can be specified.
donatien 0:8e01dca41002 459 *
donatien 0:8e01dca41002 460 * This function exists mainly for DHCP, to be able to send UDP packets
donatien 0:8e01dca41002 461 * on a netif that is still down.
donatien 0:8e01dca41002 462 *
donatien 0:8e01dca41002 463 * @param pcb UDP PCB used to send the data.
donatien 0:8e01dca41002 464 * @param p chain of pbuf's to be sent.
donatien 0:8e01dca41002 465 * @param dst_ip Destination IP address.
donatien 0:8e01dca41002 466 * @param dst_port Destination UDP port.
donatien 0:8e01dca41002 467 * @param netif the netif used for sending.
donatien 0:8e01dca41002 468 *
donatien 0:8e01dca41002 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
donatien 0:8e01dca41002 470 *
donatien 0:8e01dca41002 471 * @return lwIP error code (@see udp_send for possible error codes)
donatien 0:8e01dca41002 472 *
donatien 0:8e01dca41002 473 * @see udp_disconnect() udp_send()
donatien 0:8e01dca41002 474 */
donatien 0:8e01dca41002 475 err_t
donatien 0:8e01dca41002 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
donatien 0:8e01dca41002 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
donatien 0:8e01dca41002 478 {
donatien 0:8e01dca41002 479 #if LWIP_CHECKSUM_ON_COPY
donatien 0:8e01dca41002 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
donatien 0:8e01dca41002 481 }
donatien 0:8e01dca41002 482
donatien 0:8e01dca41002 483 /** Same as udp_sendto_if(), but with checksum */
donatien 0:8e01dca41002 484 err_t
donatien 0:8e01dca41002 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
donatien 0:8e01dca41002 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
donatien 0:8e01dca41002 487 u16_t chksum)
donatien 0:8e01dca41002 488 {
donatien 0:8e01dca41002 489 #endif /* LWIP_CHECKSUM_ON_COPY */
donatien 0:8e01dca41002 490 struct udp_hdr *udphdr;
donatien 0:8e01dca41002 491 ip_addr_t *src_ip;
donatien 0:8e01dca41002 492 err_t err;
donatien 0:8e01dca41002 493 struct pbuf *q; /* q will be sent down the stack */
donatien 0:8e01dca41002 494
donatien 0:8e01dca41002 495 #if IP_SOF_BROADCAST
donatien 0:8e01dca41002 496 /* broadcast filter? */
donatien 0:8e01dca41002 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
donatien 0:8e01dca41002 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
donatien 0:8e01dca41002 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
donatien 0:8e01dca41002 500 return ERR_VAL;
donatien 0:8e01dca41002 501 }
donatien 0:8e01dca41002 502 #endif /* IP_SOF_BROADCAST */
donatien 0:8e01dca41002 503
donatien 0:8e01dca41002 504 /* if the PCB is not yet bound to a port, bind it here */
donatien 0:8e01dca41002 505 if (pcb->local_port == 0) {
donatien 0:8e01dca41002 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
donatien 0:8e01dca41002 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
donatien 0:8e01dca41002 508 if (err != ERR_OK) {
donatien 0:8e01dca41002 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
donatien 0:8e01dca41002 510 return err;
donatien 0:8e01dca41002 511 }
donatien 0:8e01dca41002 512 }
donatien 0:8e01dca41002 513
donatien 0:8e01dca41002 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
donatien 0:8e01dca41002 515 if (pbuf_header(p, UDP_HLEN)) {
donatien 0:8e01dca41002 516 /* allocate header in a separate new pbuf */
donatien 0:8e01dca41002 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
donatien 0:8e01dca41002 518 /* new header pbuf could not be allocated? */
donatien 0:8e01dca41002 519 if (q == NULL) {
donatien 0:8e01dca41002 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
donatien 0:8e01dca41002 521 return ERR_MEM;
donatien 0:8e01dca41002 522 }
donatien 0:8e01dca41002 523 if (p->tot_len != 0) {
donatien 0:8e01dca41002 524 /* chain header q in front of given pbuf p (only if p contains data) */
donatien 0:8e01dca41002 525 pbuf_chain(q, p);
donatien 0:8e01dca41002 526 }
donatien 0:8e01dca41002 527 /* first pbuf q points to header pbuf */
donatien 0:8e01dca41002 528 LWIP_DEBUGF(UDP_DEBUG,
donatien 0:8e01dca41002 529 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
donatien 0:8e01dca41002 530 } else {
donatien 0:8e01dca41002 531 /* adding space for header within p succeeded */
donatien 0:8e01dca41002 532 /* first pbuf q equals given pbuf */
donatien 0:8e01dca41002 533 q = p;
donatien 0:8e01dca41002 534 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
donatien 0:8e01dca41002 535 }
donatien 0:8e01dca41002 536 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
donatien 0:8e01dca41002 537 (q->len >= sizeof(struct udp_hdr)));
donatien 0:8e01dca41002 538 /* q now represents the packet to be sent */
donatien 0:8e01dca41002 539 udphdr = (struct udp_hdr *)q->payload;
donatien 0:8e01dca41002 540 udphdr->src = htons(pcb->local_port);
donatien 0:8e01dca41002 541 udphdr->dest = htons(dst_port);
donatien 0:8e01dca41002 542 /* in UDP, 0 checksum means 'no checksum' */
donatien 0:8e01dca41002 543 udphdr->chksum = 0x0000;
donatien 0:8e01dca41002 544
donatien 0:8e01dca41002 545 /* Multicast Loop? */
donatien 0:8e01dca41002 546 #if LWIP_IGMP
donatien 0:8e01dca41002 547 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
donatien 0:8e01dca41002 548 q->flags |= PBUF_FLAG_MCASTLOOP;
donatien 0:8e01dca41002 549 }
donatien 0:8e01dca41002 550 #endif /* LWIP_IGMP */
donatien 0:8e01dca41002 551
donatien 0:8e01dca41002 552
donatien 0:8e01dca41002 553 /* PCB local address is IP_ANY_ADDR? */
donatien 0:8e01dca41002 554 if (ip_addr_isany(&pcb->local_ip)) {
donatien 0:8e01dca41002 555 /* use outgoing network interface IP address as source address */
donatien 0:8e01dca41002 556 src_ip = &(netif->ip_addr);
donatien 0:8e01dca41002 557 } else {
donatien 0:8e01dca41002 558 /* check if UDP PCB local IP address is correct
donatien 0:8e01dca41002 559 * this could be an old address if netif->ip_addr has changed */
donatien 0:8e01dca41002 560 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
donatien 0:8e01dca41002 561 /* local_ip doesn't match, drop the packet */
donatien 0:8e01dca41002 562 if (q != p) {
donatien 0:8e01dca41002 563 /* free the header pbuf */
donatien 0:8e01dca41002 564 pbuf_free(q);
donatien 0:8e01dca41002 565 q = NULL;
donatien 0:8e01dca41002 566 /* p is still referenced by the caller, and will live on */
donatien 0:8e01dca41002 567 }
donatien 0:8e01dca41002 568 return ERR_VAL;
donatien 0:8e01dca41002 569 }
donatien 0:8e01dca41002 570 /* use UDP PCB local IP address as source address */
donatien 0:8e01dca41002 571 src_ip = &(pcb->local_ip);
donatien 0:8e01dca41002 572 }
donatien 0:8e01dca41002 573
donatien 0:8e01dca41002 574 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
donatien 0:8e01dca41002 575
donatien 0:8e01dca41002 576 #if LWIP_UDPLITE
donatien 0:8e01dca41002 577 /* UDP Lite protocol? */
donatien 0:8e01dca41002 578 if (pcb->flags & UDP_FLAGS_UDPLITE) {
donatien 0:8e01dca41002 579 u16_t chklen, chklen_hdr;
donatien 0:8e01dca41002 580 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
donatien 0:8e01dca41002 581 /* set UDP message length in UDP header */
donatien 0:8e01dca41002 582 chklen_hdr = chklen = pcb->chksum_len_tx;
donatien 0:8e01dca41002 583 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
donatien 0:8e01dca41002 584 if (chklen != 0) {
donatien 0:8e01dca41002 585 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
donatien 0:8e01dca41002 586 }
donatien 0:8e01dca41002 587 /* For UDP-Lite, checksum length of 0 means checksum
donatien 0:8e01dca41002 588 over the complete packet. (See RFC 3828 chap. 3.1)
donatien 0:8e01dca41002 589 At least the UDP-Lite header must be covered by the
donatien 0:8e01dca41002 590 checksum, therefore, if chksum_len has an illegal
donatien 0:8e01dca41002 591 value, we generate the checksum over the complete
donatien 0:8e01dca41002 592 packet to be safe. */
donatien 0:8e01dca41002 593 chklen_hdr = 0;
donatien 0:8e01dca41002 594 chklen = q->tot_len;
donatien 0:8e01dca41002 595 }
donatien 0:8e01dca41002 596 udphdr->len = htons(chklen_hdr);
donatien 0:8e01dca41002 597 /* calculate checksum */
donatien 0:8e01dca41002 598 #if CHECKSUM_GEN_UDP
donatien 0:8e01dca41002 599 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
donatien 0:8e01dca41002 600 IP_PROTO_UDPLITE, q->tot_len,
donatien 0:8e01dca41002 601 #if !LWIP_CHECKSUM_ON_COPY
donatien 0:8e01dca41002 602 chklen);
donatien 0:8e01dca41002 603 #else /* !LWIP_CHECKSUM_ON_COPY */
donatien 0:8e01dca41002 604 (have_chksum ? UDP_HLEN : chklen));
donatien 0:8e01dca41002 605 if (have_chksum) {
donatien 0:8e01dca41002 606 u32_t acc;
donatien 0:8e01dca41002 607 acc = udphdr->chksum + (u16_t)~(chksum);
donatien 0:8e01dca41002 608 udphdr->chksum = FOLD_U32T(acc);
donatien 0:8e01dca41002 609 }
donatien 0:8e01dca41002 610 #endif /* !LWIP_CHECKSUM_ON_COPY */
donatien 0:8e01dca41002 611
donatien 0:8e01dca41002 612 /* chksum zero must become 0xffff, as zero means 'no checksum' */
donatien 0:8e01dca41002 613 if (udphdr->chksum == 0x0000) {
donatien 0:8e01dca41002 614 udphdr->chksum = 0xffff;
donatien 0:8e01dca41002 615 }
donatien 0:8e01dca41002 616 #endif /* CHECKSUM_GEN_UDP */
donatien 0:8e01dca41002 617 /* output to IP */
donatien 0:8e01dca41002 618 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
donatien 0:8e01dca41002 619 #if LWIP_NETIF_HWADDRHINT
donatien 0:8e01dca41002 620 netif->addr_hint = &(pcb->addr_hint);
donatien 0:8e01dca41002 621 #endif /* LWIP_NETIF_HWADDRHINT*/
donatien 0:8e01dca41002 622 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
donatien 0:8e01dca41002 623 #if LWIP_NETIF_HWADDRHINT
donatien 0:8e01dca41002 624 netif->addr_hint = NULL;
donatien 0:8e01dca41002 625 #endif /* LWIP_NETIF_HWADDRHINT*/
donatien 0:8e01dca41002 626 } else
donatien 0:8e01dca41002 627 #endif /* LWIP_UDPLITE */
donatien 0:8e01dca41002 628 { /* UDP */
donatien 0:8e01dca41002 629 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
donatien 0:8e01dca41002 630 udphdr->len = htons(q->tot_len);
donatien 0:8e01dca41002 631 /* calculate checksum */
donatien 0:8e01dca41002 632 #if CHECKSUM_GEN_UDP
donatien 0:8e01dca41002 633 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
donatien 0:8e01dca41002 634 u16_t udpchksum;
donatien 0:8e01dca41002 635 #if LWIP_CHECKSUM_ON_COPY
donatien 0:8e01dca41002 636 if (have_chksum) {
donatien 0:8e01dca41002 637 u32_t acc;
donatien 0:8e01dca41002 638 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
donatien 0:8e01dca41002 639 q->tot_len, UDP_HLEN);
donatien 0:8e01dca41002 640 acc = udpchksum + (u16_t)~(chksum);
donatien 0:8e01dca41002 641 udpchksum = FOLD_U32T(acc);
donatien 0:8e01dca41002 642 } else
donatien 0:8e01dca41002 643 #endif /* LWIP_CHECKSUM_ON_COPY */
donatien 0:8e01dca41002 644 {
donatien 0:8e01dca41002 645 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
donatien 0:8e01dca41002 646 }
donatien 0:8e01dca41002 647
donatien 0:8e01dca41002 648 /* chksum zero must become 0xffff, as zero means 'no checksum' */
donatien 0:8e01dca41002 649 if (udpchksum == 0x0000) {
donatien 0:8e01dca41002 650 udpchksum = 0xffff;
donatien 0:8e01dca41002 651 }
donatien 0:8e01dca41002 652 udphdr->chksum = udpchksum;
donatien 0:8e01dca41002 653 }
donatien 0:8e01dca41002 654 #endif /* CHECKSUM_GEN_UDP */
donatien 0:8e01dca41002 655 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
donatien 0:8e01dca41002 656 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
donatien 0:8e01dca41002 657 /* output to IP */
donatien 0:8e01dca41002 658 #if LWIP_NETIF_HWADDRHINT
donatien 0:8e01dca41002 659 netif->addr_hint = &(pcb->addr_hint);
donatien 0:8e01dca41002 660 #endif /* LWIP_NETIF_HWADDRHINT*/
donatien 0:8e01dca41002 661 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
donatien 0:8e01dca41002 662 #if LWIP_NETIF_HWADDRHINT
donatien 0:8e01dca41002 663 netif->addr_hint = NULL;
donatien 0:8e01dca41002 664 #endif /* LWIP_NETIF_HWADDRHINT*/
donatien 0:8e01dca41002 665 }
donatien 0:8e01dca41002 666 /* TODO: must this be increased even if error occured? */
donatien 0:8e01dca41002 667 snmp_inc_udpoutdatagrams();
donatien 0:8e01dca41002 668
donatien 0:8e01dca41002 669 /* did we chain a separate header pbuf earlier? */
donatien 0:8e01dca41002 670 if (q != p) {
donatien 0:8e01dca41002 671 /* free the header pbuf */
donatien 0:8e01dca41002 672 pbuf_free(q);
donatien 0:8e01dca41002 673 q = NULL;
donatien 0:8e01dca41002 674 /* p is still referenced by the caller, and will live on */
donatien 0:8e01dca41002 675 }
donatien 0:8e01dca41002 676
donatien 0:8e01dca41002 677 UDP_STATS_INC(udp.xmit);
donatien 0:8e01dca41002 678 return err;
donatien 0:8e01dca41002 679 }
donatien 0:8e01dca41002 680
donatien 0:8e01dca41002 681 /**
donatien 0:8e01dca41002 682 * Bind an UDP PCB.
donatien 0:8e01dca41002 683 *
donatien 0:8e01dca41002 684 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
donatien 0:8e01dca41002 685 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
donatien 0:8e01dca41002 686 * bind to all local interfaces.
donatien 0:8e01dca41002 687 * @param port local UDP port to bind with. Use 0 to automatically bind
donatien 0:8e01dca41002 688 * to a random port between UDP_LOCAL_PORT_RANGE_START and
donatien 0:8e01dca41002 689 * UDP_LOCAL_PORT_RANGE_END.
donatien 0:8e01dca41002 690 *
donatien 0:8e01dca41002 691 * ipaddr & port are expected to be in the same byte order as in the pcb.
donatien 0:8e01dca41002 692 *
donatien 0:8e01dca41002 693 * @return lwIP error code.
donatien 0:8e01dca41002 694 * - ERR_OK. Successful. No error occured.
donatien 0:8e01dca41002 695 * - ERR_USE. The specified ipaddr and port are already bound to by
donatien 0:8e01dca41002 696 * another UDP PCB.
donatien 0:8e01dca41002 697 *
donatien 0:8e01dca41002 698 * @see udp_disconnect()
donatien 0:8e01dca41002 699 */
donatien 0:8e01dca41002 700 err_t
donatien 0:8e01dca41002 701 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
donatien 0:8e01dca41002 702 {
donatien 0:8e01dca41002 703 struct udp_pcb *ipcb;
donatien 0:8e01dca41002 704 u8_t rebind;
donatien 0:8e01dca41002 705
donatien 0:8e01dca41002 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
donatien 0:8e01dca41002 707 ip_addr_debug_print(UDP_DEBUG, ipaddr);
donatien 0:8e01dca41002 708 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
donatien 0:8e01dca41002 709
donatien 0:8e01dca41002 710 rebind = 0;
donatien 0:8e01dca41002 711 /* Check for double bind and rebind of the same pcb */
donatien 0:8e01dca41002 712 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
donatien 0:8e01dca41002 713 /* is this UDP PCB already on active list? */
donatien 0:8e01dca41002 714 if (pcb == ipcb) {
donatien 0:8e01dca41002 715 /* pcb may occur at most once in active list */
donatien 0:8e01dca41002 716 LWIP_ASSERT("rebind == 0", rebind == 0);
donatien 0:8e01dca41002 717 /* pcb already in list, just rebind */
donatien 0:8e01dca41002 718 rebind = 1;
donatien 0:8e01dca41002 719 }
donatien 0:8e01dca41002 720
donatien 0:8e01dca41002 721 /* By default, we don't allow to bind to a port that any other udp
donatien 0:8e01dca41002 722 PCB is alread bound to, unless *all* PCBs with that port have tha
donatien 0:8e01dca41002 723 REUSEADDR flag set. */
donatien 0:8e01dca41002 724 #if SO_REUSE
donatien 0:8e01dca41002 725 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
donatien 0:8e01dca41002 726 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
donatien 0:8e01dca41002 727 #else /* SO_REUSE */
donatien 0:8e01dca41002 728 /* port matches that of PCB in list and REUSEADDR not set -> reject */
donatien 0:8e01dca41002 729 else {
donatien 0:8e01dca41002 730 #endif /* SO_REUSE */
donatien 0:8e01dca41002 731 if ((ipcb->local_port == port) &&
donatien 0:8e01dca41002 732 /* IP address matches, or one is IP_ADDR_ANY? */
donatien 0:8e01dca41002 733 (ip_addr_isany(&(ipcb->local_ip)) ||
donatien 0:8e01dca41002 734 ip_addr_isany(ipaddr) ||
donatien 0:8e01dca41002 735 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
donatien 0:8e01dca41002 736 /* other PCB already binds to this local IP and port */
donatien 0:8e01dca41002 737 LWIP_DEBUGF(UDP_DEBUG,
donatien 0:8e01dca41002 738 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
donatien 0:8e01dca41002 739 return ERR_USE;
donatien 0:8e01dca41002 740 }
donatien 0:8e01dca41002 741 }
donatien 0:8e01dca41002 742 }
donatien 0:8e01dca41002 743
donatien 0:8e01dca41002 744 ip_addr_set(&pcb->local_ip, ipaddr);
donatien 0:8e01dca41002 745
donatien 0:8e01dca41002 746 /* no port specified? */
donatien 0:8e01dca41002 747 if (port == 0) {
donatien 0:8e01dca41002 748 #ifndef UDP_LOCAL_PORT_RANGE_START
donatien 0:8e01dca41002 749 /* From http://www.iana.org/assignments/port-numbers:
donatien 0:8e01dca41002 750 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
donatien 0:8e01dca41002 751 #define UDP_LOCAL_PORT_RANGE_START 0xc000
donatien 0:8e01dca41002 752 #define UDP_LOCAL_PORT_RANGE_END 0xffff
donatien 0:8e01dca41002 753 #endif
donatien 0:8e01dca41002 754 port = UDP_LOCAL_PORT_RANGE_START;
donatien 0:8e01dca41002 755 ipcb = udp_pcbs;
donatien 0:8e01dca41002 756 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
donatien 0:8e01dca41002 757 if (ipcb->local_port == port) {
donatien 0:8e01dca41002 758 /* port is already used by another udp_pcb */
donatien 0:8e01dca41002 759 port++;
donatien 0:8e01dca41002 760 /* restart scanning all udp pcbs */
donatien 0:8e01dca41002 761 ipcb = udp_pcbs;
donatien 0:8e01dca41002 762 } else {
donatien 0:8e01dca41002 763 /* go on with next udp pcb */
donatien 0:8e01dca41002 764 ipcb = ipcb->next;
donatien 0:8e01dca41002 765 }
donatien 0:8e01dca41002 766 }
donatien 0:8e01dca41002 767 if (ipcb != NULL) {
donatien 0:8e01dca41002 768 /* no more ports available in local range */
donatien 0:8e01dca41002 769 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
donatien 0:8e01dca41002 770 return ERR_USE;
donatien 0:8e01dca41002 771 }
donatien 0:8e01dca41002 772 }
donatien 0:8e01dca41002 773 pcb->local_port = port;
donatien 0:8e01dca41002 774 snmp_insert_udpidx_tree(pcb);
donatien 0:8e01dca41002 775 /* pcb not active yet? */
donatien 0:8e01dca41002 776 if (rebind == 0) {
donatien 0:8e01dca41002 777 /* place the PCB on the active list if not already there */
donatien 0:8e01dca41002 778 pcb->next = udp_pcbs;
donatien 0:8e01dca41002 779 udp_pcbs = pcb;
donatien 0:8e01dca41002 780 }
donatien 0:8e01dca41002 781 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
donatien 0:8e01dca41002 782 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
donatien 0:8e01dca41002 783 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien 0:8e01dca41002 784 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
donatien 0:8e01dca41002 785 pcb->local_port));
donatien 0:8e01dca41002 786 return ERR_OK;
donatien 0:8e01dca41002 787 }
donatien 0:8e01dca41002 788 /**
donatien 0:8e01dca41002 789 * Connect an UDP PCB.
donatien 0:8e01dca41002 790 *
donatien 0:8e01dca41002 791 * This will associate the UDP PCB with the remote address.
donatien 0:8e01dca41002 792 *
donatien 0:8e01dca41002 793 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
donatien 0:8e01dca41002 794 * @param ipaddr remote IP address to connect with.
donatien 0:8e01dca41002 795 * @param port remote UDP port to connect with.
donatien 0:8e01dca41002 796 *
donatien 0:8e01dca41002 797 * @return lwIP error code
donatien 0:8e01dca41002 798 *
donatien 0:8e01dca41002 799 * ipaddr & port are expected to be in the same byte order as in the pcb.
donatien 0:8e01dca41002 800 *
donatien 0:8e01dca41002 801 * The udp pcb is bound to a random local port if not already bound.
donatien 0:8e01dca41002 802 *
donatien 0:8e01dca41002 803 * @see udp_disconnect()
donatien 0:8e01dca41002 804 */
donatien 0:8e01dca41002 805 err_t
donatien 0:8e01dca41002 806 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
donatien 0:8e01dca41002 807 {
donatien 0:8e01dca41002 808 struct udp_pcb *ipcb;
donatien 0:8e01dca41002 809
donatien 0:8e01dca41002 810 if (pcb->local_port == 0) {
donatien 0:8e01dca41002 811 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
donatien 0:8e01dca41002 812 if (err != ERR_OK) {
donatien 0:8e01dca41002 813 return err;
donatien 0:8e01dca41002 814 }
donatien 0:8e01dca41002 815 }
donatien 0:8e01dca41002 816
donatien 0:8e01dca41002 817 ip_addr_set(&pcb->remote_ip, ipaddr);
donatien 0:8e01dca41002 818 pcb->remote_port = port;
donatien 0:8e01dca41002 819 pcb->flags |= UDP_FLAGS_CONNECTED;
donatien 0:8e01dca41002 820 /** TODO: this functionality belongs in upper layers */
donatien 0:8e01dca41002 821 #ifdef LWIP_UDP_TODO
donatien 0:8e01dca41002 822 /* Nail down local IP for netconn_addr()/getsockname() */
donatien 0:8e01dca41002 823 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
donatien 0:8e01dca41002 824 struct netif *netif;
donatien 0:8e01dca41002 825
donatien 0:8e01dca41002 826 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
donatien 0:8e01dca41002 827 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
donatien 0:8e01dca41002 828 UDP_STATS_INC(udp.rterr);
donatien 0:8e01dca41002 829 return ERR_RTE;
donatien 0:8e01dca41002 830 }
donatien 0:8e01dca41002 831 /** TODO: this will bind the udp pcb locally, to the interface which
donatien 0:8e01dca41002 832 is used to route output packets to the remote address. However, we
donatien 0:8e01dca41002 833 might want to accept incoming packets on any interface! */
donatien 0:8e01dca41002 834 pcb->local_ip = netif->ip_addr;
donatien 0:8e01dca41002 835 } else if (ip_addr_isany(&pcb->remote_ip)) {
donatien 0:8e01dca41002 836 pcb->local_ip.addr = 0;
donatien 0:8e01dca41002 837 }
donatien 0:8e01dca41002 838 #endif
donatien 0:8e01dca41002 839 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
donatien 0:8e01dca41002 840 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
donatien 0:8e01dca41002 841 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien 0:8e01dca41002 842 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
donatien 0:8e01dca41002 843 pcb->local_port));
donatien 0:8e01dca41002 844
donatien 0:8e01dca41002 845 /* Insert UDP PCB into the list of active UDP PCBs. */
donatien 0:8e01dca41002 846 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
donatien 0:8e01dca41002 847 if (pcb == ipcb) {
donatien 0:8e01dca41002 848 /* already on the list, just return */
donatien 0:8e01dca41002 849 return ERR_OK;
donatien 0:8e01dca41002 850 }
donatien 0:8e01dca41002 851 }
donatien 0:8e01dca41002 852 /* PCB not yet on the list, add PCB now */
donatien 0:8e01dca41002 853 pcb->next = udp_pcbs;
donatien 0:8e01dca41002 854 udp_pcbs = pcb;
donatien 0:8e01dca41002 855 return ERR_OK;
donatien 0:8e01dca41002 856 }
donatien 0:8e01dca41002 857
donatien 0:8e01dca41002 858 /**
donatien 0:8e01dca41002 859 * Disconnect a UDP PCB
donatien 0:8e01dca41002 860 *
donatien 0:8e01dca41002 861 * @param pcb the udp pcb to disconnect.
donatien 0:8e01dca41002 862 */
donatien 0:8e01dca41002 863 void
donatien 0:8e01dca41002 864 udp_disconnect(struct udp_pcb *pcb)
donatien 0:8e01dca41002 865 {
donatien 0:8e01dca41002 866 /* reset remote address association */
donatien 0:8e01dca41002 867 ip_addr_set_any(&pcb->remote_ip);
donatien 0:8e01dca41002 868 pcb->remote_port = 0;
donatien 0:8e01dca41002 869 /* mark PCB as unconnected */
donatien 0:8e01dca41002 870 pcb->flags &= ~UDP_FLAGS_CONNECTED;
donatien 0:8e01dca41002 871 }
donatien 0:8e01dca41002 872
donatien 0:8e01dca41002 873 /**
donatien 0:8e01dca41002 874 * Set a receive callback for a UDP PCB
donatien 0:8e01dca41002 875 *
donatien 0:8e01dca41002 876 * This callback will be called when receiving a datagram for the pcb.
donatien 0:8e01dca41002 877 *
donatien 0:8e01dca41002 878 * @param pcb the pcb for wich to set the recv callback
donatien 0:8e01dca41002 879 * @param recv function pointer of the callback function
donatien 0:8e01dca41002 880 * @param recv_arg additional argument to pass to the callback function
donatien 0:8e01dca41002 881 */
donatien 0:8e01dca41002 882 void
donatien 0:8e01dca41002 883 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
donatien 0:8e01dca41002 884 {
donatien 0:8e01dca41002 885 /* remember recv() callback and user data */
donatien 0:8e01dca41002 886 pcb->recv = recv;
donatien 0:8e01dca41002 887 pcb->recv_arg = recv_arg;
donatien 0:8e01dca41002 888 }
donatien 0:8e01dca41002 889
donatien 0:8e01dca41002 890 /**
donatien 0:8e01dca41002 891 * Remove an UDP PCB.
donatien 0:8e01dca41002 892 *
donatien 0:8e01dca41002 893 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
donatien 0:8e01dca41002 894 * UDP PCB's and the data structure is freed from memory.
donatien 0:8e01dca41002 895 *
donatien 0:8e01dca41002 896 * @see udp_new()
donatien 0:8e01dca41002 897 */
donatien 0:8e01dca41002 898 void
donatien 0:8e01dca41002 899 udp_remove(struct udp_pcb *pcb)
donatien 0:8e01dca41002 900 {
donatien 0:8e01dca41002 901 struct udp_pcb *pcb2;
donatien 0:8e01dca41002 902
donatien 0:8e01dca41002 903 snmp_delete_udpidx_tree(pcb);
donatien 0:8e01dca41002 904 /* pcb to be removed is first in list? */
donatien 0:8e01dca41002 905 if (udp_pcbs == pcb) {
donatien 0:8e01dca41002 906 /* make list start at 2nd pcb */
donatien 0:8e01dca41002 907 udp_pcbs = udp_pcbs->next;
donatien 0:8e01dca41002 908 /* pcb not 1st in list */
donatien 0:8e01dca41002 909 } else {
donatien 0:8e01dca41002 910 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
donatien 0:8e01dca41002 911 /* find pcb in udp_pcbs list */
donatien 0:8e01dca41002 912 if (pcb2->next != NULL && pcb2->next == pcb) {
donatien 0:8e01dca41002 913 /* remove pcb from list */
donatien 0:8e01dca41002 914 pcb2->next = pcb->next;
donatien 0:8e01dca41002 915 }
donatien 0:8e01dca41002 916 }
donatien 0:8e01dca41002 917 }
donatien 0:8e01dca41002 918 memp_free(MEMP_UDP_PCB, pcb);
donatien 0:8e01dca41002 919 }
donatien 0:8e01dca41002 920
donatien 0:8e01dca41002 921 /**
donatien 0:8e01dca41002 922 * Create a UDP PCB.
donatien 0:8e01dca41002 923 *
donatien 0:8e01dca41002 924 * @return The UDP PCB which was created. NULL if the PCB data structure
donatien 0:8e01dca41002 925 * could not be allocated.
donatien 0:8e01dca41002 926 *
donatien 0:8e01dca41002 927 * @see udp_remove()
donatien 0:8e01dca41002 928 */
donatien 0:8e01dca41002 929 struct udp_pcb *
donatien 0:8e01dca41002 930 udp_new(void)
donatien 0:8e01dca41002 931 {
donatien 0:8e01dca41002 932 struct udp_pcb *pcb;
donatien 0:8e01dca41002 933 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
donatien 0:8e01dca41002 934 /* could allocate UDP PCB? */
donatien 0:8e01dca41002 935 if (pcb != NULL) {
donatien 0:8e01dca41002 936 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
donatien 0:8e01dca41002 937 * which means checksum is generated over the whole datagram per default
donatien 0:8e01dca41002 938 * (recommended as default by RFC 3828). */
donatien 0:8e01dca41002 939 /* initialize PCB to all zeroes */
donatien 0:8e01dca41002 940 memset(pcb, 0, sizeof(struct udp_pcb));
donatien 0:8e01dca41002 941 pcb->ttl = UDP_TTL;
donatien 0:8e01dca41002 942 }
donatien 0:8e01dca41002 943 return pcb;
donatien 0:8e01dca41002 944 }
donatien 0:8e01dca41002 945
donatien 0:8e01dca41002 946 #if UDP_DEBUG
donatien 0:8e01dca41002 947 /**
donatien 0:8e01dca41002 948 * Print UDP header information for debug purposes.
donatien 0:8e01dca41002 949 *
donatien 0:8e01dca41002 950 * @param udphdr pointer to the udp header in memory.
donatien 0:8e01dca41002 951 */
donatien 0:8e01dca41002 952 void
donatien 0:8e01dca41002 953 udp_debug_print(struct udp_hdr *udphdr)
donatien 0:8e01dca41002 954 {
donatien 0:8e01dca41002 955 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
donatien 0:8e01dca41002 956 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien 0:8e01dca41002 957 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
donatien 0:8e01dca41002 958 ntohs(udphdr->src), ntohs(udphdr->dest)));
donatien 0:8e01dca41002 959 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien 0:8e01dca41002 960 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
donatien 0:8e01dca41002 961 ntohs(udphdr->len), ntohs(udphdr->chksum)));
donatien 0:8e01dca41002 962 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien 0:8e01dca41002 963 }
donatien 0:8e01dca41002 964 #endif /* UDP_DEBUG */
donatien 0:8e01dca41002 965
donatien 0:8e01dca41002 966 #endif /* LWIP_UDP */