Marcelo Rebonatto / lwip

Modify changes to test TCP socket.

Dependents:   EthernetInterface

Fork of lwip by mbed official

core/udp.c@12:963887732b7c, 2013-12-13 (annotated)

Committer:
rebonatto
Date:
Fri Dec 13 11:39:39 2013 +0000
Revision:
12:963887732b7c
Parent:
0:51ac1d130fd4 
modify;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /**
mbed_official 0:51ac1d130fd4 2 * @file
mbed_official 0:51ac1d130fd4 3 * User Datagram Protocol module
mbed_official 0:51ac1d130fd4 4 *
mbed_official 0:51ac1d130fd4 5 */
mbed_official 0:51ac1d130fd4 6
mbed_official 0:51ac1d130fd4 7 /*
mbed_official 0:51ac1d130fd4 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed_official 0:51ac1d130fd4 9 * All rights reserved.
mbed_official 0:51ac1d130fd4 10 *
mbed_official 0:51ac1d130fd4 11 * Redistribution and use in source and binary forms, with or without modification,
mbed_official 0:51ac1d130fd4 12 * are permitted provided that the following conditions are met:
mbed_official 0:51ac1d130fd4 13 *
mbed_official 0:51ac1d130fd4 14 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 0:51ac1d130fd4 15 * this list of conditions and the following disclaimer.
mbed_official 0:51ac1d130fd4 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 0:51ac1d130fd4 17 * this list of conditions and the following disclaimer in the documentation
mbed_official 0:51ac1d130fd4 18 * and/or other materials provided with the distribution.
mbed_official 0:51ac1d130fd4 19 * 3. The name of the author may not be used to endorse or promote products
mbed_official 0:51ac1d130fd4 20 * derived from this software without specific prior written permission.
mbed_official 0:51ac1d130fd4 21 *
mbed_official 0:51ac1d130fd4 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed_official 0:51ac1d130fd4 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed_official 0:51ac1d130fd4 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed_official 0:51ac1d130fd4 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed_official 0:51ac1d130fd4 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed_official 0:51ac1d130fd4 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed_official 0:51ac1d130fd4 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed_official 0:51ac1d130fd4 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed_official 0:51ac1d130fd4 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed_official 0:51ac1d130fd4 31 * OF SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 32 *
mbed_official 0:51ac1d130fd4 33 * This file is part of the lwIP TCP/IP stack.
mbed_official 0:51ac1d130fd4 34 *
mbed_official 0:51ac1d130fd4 35 * Author: Adam Dunkels <adam@sics.se>
mbed_official 0:51ac1d130fd4 36 *
mbed_official 0:51ac1d130fd4 37 */
mbed_official 0:51ac1d130fd4 38
mbed_official 0:51ac1d130fd4 39
mbed_official 0:51ac1d130fd4 40 /* udp.c
mbed_official 0:51ac1d130fd4 41 *
mbed_official 0:51ac1d130fd4 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
mbed_official 0:51ac1d130fd4 43 *
mbed_official 0:51ac1d130fd4 44 */
mbed_official 0:51ac1d130fd4 45
mbed_official 0:51ac1d130fd4 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
mbed_official 0:51ac1d130fd4 47 */
mbed_official 0:51ac1d130fd4 48
mbed_official 0:51ac1d130fd4 49 #include "lwip/opt.h"
mbed_official 0:51ac1d130fd4 50
mbed_official 0:51ac1d130fd4 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
mbed_official 0:51ac1d130fd4 52
mbed_official 0:51ac1d130fd4 53 #include "lwip/udp.h"
mbed_official 0:51ac1d130fd4 54 #include "lwip/def.h"
mbed_official 0:51ac1d130fd4 55 #include "lwip/memp.h"
mbed_official 0:51ac1d130fd4 56 #include "lwip/inet_chksum.h"
mbed_official 0:51ac1d130fd4 57 #include "lwip/ip_addr.h"
mbed_official 0:51ac1d130fd4 58 #include "lwip/netif.h"
mbed_official 0:51ac1d130fd4 59 #include "lwip/icmp.h"
mbed_official 0:51ac1d130fd4 60 #include "lwip/stats.h"
mbed_official 0:51ac1d130fd4 61 #include "lwip/snmp.h"
mbed_official 0:51ac1d130fd4 62 #include "arch/perf.h"
mbed_official 0:51ac1d130fd4 63 #include "lwip/dhcp.h"
mbed_official 0:51ac1d130fd4 64
mbed_official 0:51ac1d130fd4 65 #include <string.h>
mbed_official 0:51ac1d130fd4 66
mbed_official 0:51ac1d130fd4 67 /* The list of UDP PCBs */
mbed_official 0:51ac1d130fd4 68 /* exported in udp.h (was static) */
mbed_official 0:51ac1d130fd4 69 struct udp_pcb *udp_pcbs;
mbed_official 0:51ac1d130fd4 70
mbed_official 0:51ac1d130fd4 71 /**
mbed_official 0:51ac1d130fd4 72 * Process an incoming UDP datagram.
mbed_official 0:51ac1d130fd4 73 *
mbed_official 0:51ac1d130fd4 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
mbed_official 0:51ac1d130fd4 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
mbed_official 0:51ac1d130fd4 76 * recv function. If no pcb is found or the datagram is incorrect, the
mbed_official 0:51ac1d130fd4 77 * pbuf is freed.
mbed_official 0:51ac1d130fd4 78 *
mbed_official 0:51ac1d130fd4 79 * @param p pbuf to be demultiplexed to a UDP PCB.
mbed_official 0:51ac1d130fd4 80 * @param inp network interface on which the datagram was received.
mbed_official 0:51ac1d130fd4 81 *
mbed_official 0:51ac1d130fd4 82 */
mbed_official 0:51ac1d130fd4 83 void
mbed_official 0:51ac1d130fd4 84 udp_input(struct pbuf *p, struct netif *inp)
mbed_official 0:51ac1d130fd4 85 {
mbed_official 0:51ac1d130fd4 86 struct udp_hdr *udphdr;
mbed_official 0:51ac1d130fd4 87 struct udp_pcb *pcb, *prev;
mbed_official 0:51ac1d130fd4 88 struct udp_pcb *uncon_pcb;
mbed_official 0:51ac1d130fd4 89 struct ip_hdr *iphdr;
mbed_official 0:51ac1d130fd4 90 u16_t src, dest;
mbed_official 0:51ac1d130fd4 91 u8_t local_match;
mbed_official 0:51ac1d130fd4 92 u8_t broadcast;
mbed_official 0:51ac1d130fd4 93
mbed_official 0:51ac1d130fd4 94 PERF_START;
mbed_official 0:51ac1d130fd4 95
mbed_official 0:51ac1d130fd4 96 UDP_STATS_INC(udp.recv);
mbed_official 0:51ac1d130fd4 97
mbed_official 0:51ac1d130fd4 98 iphdr = (struct ip_hdr *)p->payload;
mbed_official 0:51ac1d130fd4 99
mbed_official 0:51ac1d130fd4 100 /* Check minimum length (IP header + UDP header)
mbed_official 0:51ac1d130fd4 101 * and move payload pointer to UDP header */
mbed_official 0:51ac1d130fd4 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
mbed_official 0:51ac1d130fd4 103 /* drop short packets */
mbed_official 0:51ac1d130fd4 104 LWIP_DEBUGF(UDP_DEBUG,
mbed_official 0:51ac1d130fd4 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
mbed_official 0:51ac1d130fd4 106 UDP_STATS_INC(udp.lenerr);
mbed_official 0:51ac1d130fd4 107 UDP_STATS_INC(udp.drop);
mbed_official 0:51ac1d130fd4 108 snmp_inc_udpinerrors();
mbed_official 0:51ac1d130fd4 109 pbuf_free(p);
mbed_official 0:51ac1d130fd4 110 goto end;
mbed_official 0:51ac1d130fd4 111 }
mbed_official 0:51ac1d130fd4 112
mbed_official 0:51ac1d130fd4 113 udphdr = (struct udp_hdr *)p->payload;
mbed_official 0:51ac1d130fd4 114
mbed_official 0:51ac1d130fd4 115 /* is broadcast packet ? */
mbed_official 0:51ac1d130fd4 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
mbed_official 0:51ac1d130fd4 117
mbed_official 0:51ac1d130fd4 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
mbed_official 0:51ac1d130fd4 119
mbed_official 0:51ac1d130fd4 120 /* convert src and dest ports to host byte order */
mbed_official 0:51ac1d130fd4 121 src = ntohs(udphdr->src);
mbed_official 0:51ac1d130fd4 122 dest = ntohs(udphdr->dest);
mbed_official 0:51ac1d130fd4 123
mbed_official 0:51ac1d130fd4 124 udp_debug_print(udphdr);
mbed_official 0:51ac1d130fd4 125
mbed_official 0:51ac1d130fd4 126 /* print the UDP source and destination */
mbed_official 0:51ac1d130fd4 127 LWIP_DEBUGF(UDP_DEBUG,
mbed_official 0:51ac1d130fd4 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
mbed_official 0:51ac1d130fd4 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
mbed_official 0:51ac1d130fd4 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
mbed_official 0:51ac1d130fd4 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
mbed_official 0:51ac1d130fd4 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
mbed_official 0:51ac1d130fd4 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
mbed_official 0:51ac1d130fd4 134
mbed_official 0:51ac1d130fd4 135 #if LWIP_DHCP
mbed_official 0:51ac1d130fd4 136 pcb = NULL;
mbed_official 0:51ac1d130fd4 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
mbed_official 0:51ac1d130fd4 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
mbed_official 0:51ac1d130fd4 139 if (dest == DHCP_CLIENT_PORT) {
mbed_official 0:51ac1d130fd4 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
mbed_official 0:51ac1d130fd4 141 if (src == DHCP_SERVER_PORT) {
mbed_official 0:51ac1d130fd4 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
mbed_official 0:51ac1d130fd4 143 /* accept the packe if
mbed_official 0:51ac1d130fd4 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
mbed_official 0:51ac1d130fd4 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
mbed_official 0:51ac1d130fd4 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
mbed_official 0:51ac1d130fd4 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
mbed_official 0:51ac1d130fd4 148 pcb = inp->dhcp->pcb;
mbed_official 0:51ac1d130fd4 149 }
mbed_official 0:51ac1d130fd4 150 }
mbed_official 0:51ac1d130fd4 151 }
mbed_official 0:51ac1d130fd4 152 } else
mbed_official 0:51ac1d130fd4 153 #endif /* LWIP_DHCP */
mbed_official 0:51ac1d130fd4 154 {
mbed_official 0:51ac1d130fd4 155 prev = NULL;
mbed_official 0:51ac1d130fd4 156 local_match = 0;
mbed_official 0:51ac1d130fd4 157 uncon_pcb = NULL;
mbed_official 0:51ac1d130fd4 158 /* Iterate through the UDP pcb list for a matching pcb.
mbed_official 0:51ac1d130fd4 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
mbed_official 0:51ac1d130fd4 160 * preferred. If no perfect match is found, the first unconnected pcb that
mbed_official 0:51ac1d130fd4 161 * matches the local port and ip address gets the datagram. */
mbed_official 0:51ac1d130fd4 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
mbed_official 0:51ac1d130fd4 163 local_match = 0;
mbed_official 0:51ac1d130fd4 164 /* print the PCB local and remote address */
mbed_official 0:51ac1d130fd4 165 LWIP_DEBUGF(UDP_DEBUG,
mbed_official 0:51ac1d130fd4 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
mbed_official 0:51ac1d130fd4 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
mbed_official 0:51ac1d130fd4 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed_official 0:51ac1d130fd4 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
mbed_official 0:51ac1d130fd4 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
mbed_official 0:51ac1d130fd4 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
mbed_official 0:51ac1d130fd4 172
mbed_official 0:51ac1d130fd4 173 /* compare PCB local addr+port to UDP destination addr+port */
mbed_official 0:51ac1d130fd4 174 if ((pcb->local_port == dest) &&
mbed_official 0:51ac1d130fd4 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
mbed_official 0:51ac1d130fd4 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
mbed_official 0:51ac1d130fd4 177 #if LWIP_IGMP
mbed_official 0:51ac1d130fd4 178 ip_addr_ismulticast(&current_iphdr_dest) ||
mbed_official 0:51ac1d130fd4 179 #endif /* LWIP_IGMP */
mbed_official 0:51ac1d130fd4 180 #if IP_SOF_BROADCAST_RECV
mbed_official 0:51ac1d130fd4 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
mbed_official 0:51ac1d130fd4 182 #else /* IP_SOF_BROADCAST_RECV */
mbed_official 0:51ac1d130fd4 183 (broadcast))) {
mbed_official 0:51ac1d130fd4 184 #endif /* IP_SOF_BROADCAST_RECV */
mbed_official 0:51ac1d130fd4 185 local_match = 1;
mbed_official 0:51ac1d130fd4 186 if ((uncon_pcb == NULL) &&
mbed_official 0:51ac1d130fd4 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
mbed_official 0:51ac1d130fd4 188 /* the first unconnected matching PCB */
mbed_official 0:51ac1d130fd4 189 uncon_pcb = pcb;
mbed_official 0:51ac1d130fd4 190 }
mbed_official 0:51ac1d130fd4 191 }
mbed_official 0:51ac1d130fd4 192 /* compare PCB remote addr+port to UDP source addr+port */
mbed_official 0:51ac1d130fd4 193 if ((local_match != 0) &&
mbed_official 0:51ac1d130fd4 194 (pcb->remote_port == src) &&
mbed_official 0:51ac1d130fd4 195 (ip_addr_isany(&pcb->remote_ip) ||
mbed_official 0:51ac1d130fd4 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
mbed_official 0:51ac1d130fd4 197 /* the first fully matching PCB */
mbed_official 0:51ac1d130fd4 198 if (prev != NULL) {
mbed_official 0:51ac1d130fd4 199 /* move the pcb to the front of udp_pcbs so that is
mbed_official 0:51ac1d130fd4 200 found faster next time */
mbed_official 0:51ac1d130fd4 201 prev->next = pcb->next;
mbed_official 0:51ac1d130fd4 202 pcb->next = udp_pcbs;
mbed_official 0:51ac1d130fd4 203 udp_pcbs = pcb;
mbed_official 0:51ac1d130fd4 204 } else {
mbed_official 0:51ac1d130fd4 205 UDP_STATS_INC(udp.cachehit);
mbed_official 0:51ac1d130fd4 206 }
mbed_official 0:51ac1d130fd4 207 break;
mbed_official 0:51ac1d130fd4 208 }
mbed_official 0:51ac1d130fd4 209 prev = pcb;
mbed_official 0:51ac1d130fd4 210 }
mbed_official 0:51ac1d130fd4 211 /* no fully matching pcb found? then look for an unconnected pcb */
mbed_official 0:51ac1d130fd4 212 if (pcb == NULL) {
mbed_official 0:51ac1d130fd4 213 pcb = uncon_pcb;
mbed_official 0:51ac1d130fd4 214 }
mbed_official 0:51ac1d130fd4 215 }
mbed_official 0:51ac1d130fd4 216
mbed_official 0:51ac1d130fd4 217 /* Check checksum if this is a match or if it was directed at us. */
mbed_official 0:51ac1d130fd4 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
mbed_official 0:51ac1d130fd4 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
mbed_official 0:51ac1d130fd4 220 #if LWIP_UDPLITE
mbed_official 0:51ac1d130fd4 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
mbed_official 0:51ac1d130fd4 222 /* Do the UDP Lite checksum */
mbed_official 0:51ac1d130fd4 223 #if CHECKSUM_CHECK_UDP
mbed_official 0:51ac1d130fd4 224 u16_t chklen = ntohs(udphdr->len);
mbed_official 0:51ac1d130fd4 225 if (chklen < sizeof(struct udp_hdr)) {
mbed_official 0:51ac1d130fd4 226 if (chklen == 0) {
mbed_official 0:51ac1d130fd4 227 /* For UDP-Lite, checksum length of 0 means checksum
mbed_official 0:51ac1d130fd4 228 over the complete packet (See RFC 3828 chap. 3.1) */
mbed_official 0:51ac1d130fd4 229 chklen = p->tot_len;
mbed_official 0:51ac1d130fd4 230 } else {
mbed_official 0:51ac1d130fd4 231 /* At least the UDP-Lite header must be covered by the
mbed_official 0:51ac1d130fd4 232 checksum! (Again, see RFC 3828 chap. 3.1) */
mbed_official 0:51ac1d130fd4 233 UDP_STATS_INC(udp.chkerr);
mbed_official 0:51ac1d130fd4 234 UDP_STATS_INC(udp.drop);
mbed_official 0:51ac1d130fd4 235 snmp_inc_udpinerrors();
mbed_official 0:51ac1d130fd4 236 pbuf_free(p);
mbed_official 0:51ac1d130fd4 237 goto end;
mbed_official 0:51ac1d130fd4 238 }
mbed_official 0:51ac1d130fd4 239 }
mbed_official 0:51ac1d130fd4 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
mbed_official 0:51ac1d130fd4 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
mbed_official 0:51ac1d130fd4 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mbed_official 0:51ac1d130fd4 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
mbed_official 0:51ac1d130fd4 244 UDP_STATS_INC(udp.chkerr);
mbed_official 0:51ac1d130fd4 245 UDP_STATS_INC(udp.drop);
mbed_official 0:51ac1d130fd4 246 snmp_inc_udpinerrors();
mbed_official 0:51ac1d130fd4 247 pbuf_free(p);
mbed_official 0:51ac1d130fd4 248 goto end;
mbed_official 0:51ac1d130fd4 249 }
mbed_official 0:51ac1d130fd4 250 #endif /* CHECKSUM_CHECK_UDP */
mbed_official 0:51ac1d130fd4 251 } else
mbed_official 0:51ac1d130fd4 252 #endif /* LWIP_UDPLITE */
mbed_official 0:51ac1d130fd4 253 {
mbed_official 0:51ac1d130fd4 254 #if CHECKSUM_CHECK_UDP
mbed_official 0:51ac1d130fd4 255 if (udphdr->chksum != 0) {
mbed_official 0:51ac1d130fd4 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
mbed_official 0:51ac1d130fd4 257 IP_PROTO_UDP, p->tot_len) != 0) {
mbed_official 0:51ac1d130fd4 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mbed_official 0:51ac1d130fd4 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
mbed_official 0:51ac1d130fd4 260 UDP_STATS_INC(udp.chkerr);
mbed_official 0:51ac1d130fd4 261 UDP_STATS_INC(udp.drop);
mbed_official 0:51ac1d130fd4 262 snmp_inc_udpinerrors();
mbed_official 0:51ac1d130fd4 263 pbuf_free(p);
mbed_official 0:51ac1d130fd4 264 goto end;
mbed_official 0:51ac1d130fd4 265 }
mbed_official 0:51ac1d130fd4 266 }
mbed_official 0:51ac1d130fd4 267 #endif /* CHECKSUM_CHECK_UDP */
mbed_official 0:51ac1d130fd4 268 }
mbed_official 0:51ac1d130fd4 269 if(pbuf_header(p, -UDP_HLEN)) {
mbed_official 0:51ac1d130fd4 270 /* Can we cope with this failing? Just assert for now */
mbed_official 0:51ac1d130fd4 271 LWIP_ASSERT("pbuf_header failed\n", 0);
mbed_official 0:51ac1d130fd4 272 UDP_STATS_INC(udp.drop);
mbed_official 0:51ac1d130fd4 273 snmp_inc_udpinerrors();
mbed_official 0:51ac1d130fd4 274 pbuf_free(p);
mbed_official 0:51ac1d130fd4 275 goto end;
mbed_official 0:51ac1d130fd4 276 }
mbed_official 0:51ac1d130fd4 277 if (pcb != NULL) {
mbed_official 0:51ac1d130fd4 278 snmp_inc_udpindatagrams();
mbed_official 0:51ac1d130fd4 279 #if SO_REUSE && SO_REUSE_RXTOALL
mbed_official 0:51ac1d130fd4 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
mbed_official 0:51ac1d130fd4 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
mbed_official 0:51ac1d130fd4 282 /* pass broadcast- or multicast packets to all multicast pcbs
mbed_official 0:51ac1d130fd4 283 if SOF_REUSEADDR is set on the first match */
mbed_official 0:51ac1d130fd4 284 struct udp_pcb *mpcb;
mbed_official 0:51ac1d130fd4 285 u8_t p_header_changed = 0;
mbed_official 0:51ac1d130fd4 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
mbed_official 0:51ac1d130fd4 287 if (mpcb != pcb) {
mbed_official 0:51ac1d130fd4 288 /* compare PCB local addr+port to UDP destination addr+port */
mbed_official 0:51ac1d130fd4 289 if ((mpcb->local_port == dest) &&
mbed_official 0:51ac1d130fd4 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
mbed_official 0:51ac1d130fd4 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
mbed_official 0:51ac1d130fd4 292 #if LWIP_IGMP
mbed_official 0:51ac1d130fd4 293 ip_addr_ismulticast(&current_iphdr_dest) ||
mbed_official 0:51ac1d130fd4 294 #endif /* LWIP_IGMP */
mbed_official 0:51ac1d130fd4 295 #if IP_SOF_BROADCAST_RECV
mbed_official 0:51ac1d130fd4 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
mbed_official 0:51ac1d130fd4 297 #else /* IP_SOF_BROADCAST_RECV */
mbed_official 0:51ac1d130fd4 298 (broadcast))) {
mbed_official 0:51ac1d130fd4 299 #endif /* IP_SOF_BROADCAST_RECV */
mbed_official 0:51ac1d130fd4 300 /* pass a copy of the packet to all local matches */
mbed_official 0:51ac1d130fd4 301 if (mpcb->recv != NULL) {
mbed_official 0:51ac1d130fd4 302 struct pbuf *q;
mbed_official 0:51ac1d130fd4 303 /* for that, move payload to IP header again */
mbed_official 0:51ac1d130fd4 304 if (p_header_changed == 0) {
mbed_official 0:51ac1d130fd4 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed_official 0:51ac1d130fd4 306 p_header_changed = 1;
mbed_official 0:51ac1d130fd4 307 }
mbed_official 0:51ac1d130fd4 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
mbed_official 0:51ac1d130fd4 309 if (q != NULL) {
mbed_official 0:51ac1d130fd4 310 err_t err = pbuf_copy(q, p);
mbed_official 0:51ac1d130fd4 311 if (err == ERR_OK) {
mbed_official 0:51ac1d130fd4 312 /* move payload to UDP data */
mbed_official 0:51ac1d130fd4 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed_official 0:51ac1d130fd4 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
mbed_official 0:51ac1d130fd4 315 }
mbed_official 0:51ac1d130fd4 316 }
mbed_official 0:51ac1d130fd4 317 }
mbed_official 0:51ac1d130fd4 318 }
mbed_official 0:51ac1d130fd4 319 }
mbed_official 0:51ac1d130fd4 320 }
mbed_official 0:51ac1d130fd4 321 if (p_header_changed) {
mbed_official 0:51ac1d130fd4 322 /* and move payload to UDP data again */
mbed_official 0:51ac1d130fd4 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed_official 0:51ac1d130fd4 324 }
mbed_official 0:51ac1d130fd4 325 }
mbed_official 0:51ac1d130fd4 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
mbed_official 0:51ac1d130fd4 327 /* callback */
mbed_official 0:51ac1d130fd4 328 if (pcb->recv != NULL) {
mbed_official 0:51ac1d130fd4 329 /* now the recv function is responsible for freeing p */
mbed_official 0:51ac1d130fd4 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
mbed_official 0:51ac1d130fd4 331 } else {
mbed_official 0:51ac1d130fd4 332 /* no recv function registered? then we have to free the pbuf! */
mbed_official 0:51ac1d130fd4 333 pbuf_free(p);
mbed_official 0:51ac1d130fd4 334 goto end;
mbed_official 0:51ac1d130fd4 335 }
mbed_official 0:51ac1d130fd4 336 } else {
mbed_official 0:51ac1d130fd4 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
mbed_official 0:51ac1d130fd4 338
mbed_official 0:51ac1d130fd4 339 #if LWIP_ICMP
mbed_official 0:51ac1d130fd4 340 /* No match was found, send ICMP destination port unreachable unless
mbed_official 0:51ac1d130fd4 341 destination address was broadcast/multicast. */
mbed_official 0:51ac1d130fd4 342 if (!broadcast &&
mbed_official 0:51ac1d130fd4 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
mbed_official 0:51ac1d130fd4 344 /* move payload pointer back to ip header */
mbed_official 0:51ac1d130fd4 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
mbed_official 0:51ac1d130fd4 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
mbed_official 0:51ac1d130fd4 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
mbed_official 0:51ac1d130fd4 348 }
mbed_official 0:51ac1d130fd4 349 #endif /* LWIP_ICMP */
mbed_official 0:51ac1d130fd4 350 UDP_STATS_INC(udp.proterr);
mbed_official 0:51ac1d130fd4 351 UDP_STATS_INC(udp.drop);
mbed_official 0:51ac1d130fd4 352 snmp_inc_udpnoports();
mbed_official 0:51ac1d130fd4 353 pbuf_free(p);
mbed_official 0:51ac1d130fd4 354 }
mbed_official 0:51ac1d130fd4 355 } else {
mbed_official 0:51ac1d130fd4 356 pbuf_free(p);
mbed_official 0:51ac1d130fd4 357 }
mbed_official 0:51ac1d130fd4 358 end:
mbed_official 0:51ac1d130fd4 359 PERF_STOP("udp_input");
mbed_official 0:51ac1d130fd4 360 }
mbed_official 0:51ac1d130fd4 361
mbed_official 0:51ac1d130fd4 362 /**
mbed_official 0:51ac1d130fd4 363 * Send data using UDP.
mbed_official 0:51ac1d130fd4 364 *
mbed_official 0:51ac1d130fd4 365 * @param pcb UDP PCB used to send the data.
mbed_official 0:51ac1d130fd4 366 * @param p chain of pbuf's to be sent.
mbed_official 0:51ac1d130fd4 367 *
mbed_official 0:51ac1d130fd4 368 * The datagram will be sent to the current remote_ip & remote_port
mbed_official 0:51ac1d130fd4 369 * stored in pcb. If the pcb is not bound to a port, it will
mbed_official 0:51ac1d130fd4 370 * automatically be bound to a random port.
mbed_official 0:51ac1d130fd4 371 *
mbed_official 0:51ac1d130fd4 372 * @return lwIP error code.
mbed_official 0:51ac1d130fd4 373 * - ERR_OK. Successful. No error occured.
mbed_official 0:51ac1d130fd4 374 * - ERR_MEM. Out of memory.
mbed_official 0:51ac1d130fd4 375 * - ERR_RTE. Could not find route to destination address.
mbed_official 0:51ac1d130fd4 376 * - More errors could be returned by lower protocol layers.
mbed_official 0:51ac1d130fd4 377 *
mbed_official 0:51ac1d130fd4 378 * @see udp_disconnect() udp_sendto()
mbed_official 0:51ac1d130fd4 379 */
mbed_official 0:51ac1d130fd4 380 err_t
mbed_official 0:51ac1d130fd4 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
mbed_official 0:51ac1d130fd4 382 {
mbed_official 0:51ac1d130fd4 383 /* send to the packet using remote ip and port stored in the pcb */
mbed_official 0:51ac1d130fd4 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
mbed_official 0:51ac1d130fd4 385 }
mbed_official 0:51ac1d130fd4 386
mbed_official 0:51ac1d130fd4 387 #if LWIP_CHECKSUM_ON_COPY
mbed_official 0:51ac1d130fd4 388 /** Same as udp_send() but with checksum
mbed_official 0:51ac1d130fd4 389 */
mbed_official 0:51ac1d130fd4 390 err_t
mbed_official 0:51ac1d130fd4 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
mbed_official 0:51ac1d130fd4 392 u8_t have_chksum, u16_t chksum)
mbed_official 0:51ac1d130fd4 393 {
mbed_official 0:51ac1d130fd4 394 /* send to the packet using remote ip and port stored in the pcb */
mbed_official 0:51ac1d130fd4 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
mbed_official 0:51ac1d130fd4 396 have_chksum, chksum);
mbed_official 0:51ac1d130fd4 397 }
mbed_official 0:51ac1d130fd4 398 #endif /* LWIP_CHECKSUM_ON_COPY */
mbed_official 0:51ac1d130fd4 399
mbed_official 0:51ac1d130fd4 400 /**
mbed_official 0:51ac1d130fd4 401 * Send data to a specified address using UDP.
mbed_official 0:51ac1d130fd4 402 *
mbed_official 0:51ac1d130fd4 403 * @param pcb UDP PCB used to send the data.
mbed_official 0:51ac1d130fd4 404 * @param p chain of pbuf's to be sent.
mbed_official 0:51ac1d130fd4 405 * @param dst_ip Destination IP address.
mbed_official 0:51ac1d130fd4 406 * @param dst_port Destination UDP port.
mbed_official 0:51ac1d130fd4 407 *
mbed_official 0:51ac1d130fd4 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
mbed_official 0:51ac1d130fd4 409 *
mbed_official 0:51ac1d130fd4 410 * If the PCB already has a remote address association, it will
mbed_official 0:51ac1d130fd4 411 * be restored after the data is sent.
mbed_official 0:51ac1d130fd4 412 *
mbed_official 0:51ac1d130fd4 413 * @return lwIP error code (@see udp_send for possible error codes)
mbed_official 0:51ac1d130fd4 414 *
mbed_official 0:51ac1d130fd4 415 * @see udp_disconnect() udp_send()
mbed_official 0:51ac1d130fd4 416 */
mbed_official 0:51ac1d130fd4 417 err_t
mbed_official 0:51ac1d130fd4 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
mbed_official 0:51ac1d130fd4 419 ip_addr_t *dst_ip, u16_t dst_port)
mbed_official 0:51ac1d130fd4 420 {
mbed_official 0:51ac1d130fd4 421 #if LWIP_CHECKSUM_ON_COPY
mbed_official 0:51ac1d130fd4 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
mbed_official 0:51ac1d130fd4 423 }
mbed_official 0:51ac1d130fd4 424
mbed_official 0:51ac1d130fd4 425 /** Same as udp_sendto(), but with checksum */
mbed_official 0:51ac1d130fd4 426 err_t
mbed_official 0:51ac1d130fd4 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
mbed_official 0:51ac1d130fd4 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
mbed_official 0:51ac1d130fd4 429 {
mbed_official 0:51ac1d130fd4 430 #endif /* LWIP_CHECKSUM_ON_COPY */
mbed_official 0:51ac1d130fd4 431 struct netif *netif;
mbed_official 0:51ac1d130fd4 432
mbed_official 0:51ac1d130fd4 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
mbed_official 0:51ac1d130fd4 434
mbed_official 0:51ac1d130fd4 435 /* find the outgoing network interface for this packet */
mbed_official 0:51ac1d130fd4 436 #if LWIP_IGMP
mbed_official 0:51ac1d130fd4 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
mbed_official 0:51ac1d130fd4 438 #else
mbed_official 0:51ac1d130fd4 439 netif = ip_route(dst_ip);
mbed_official 0:51ac1d130fd4 440 #endif /* LWIP_IGMP */
mbed_official 0:51ac1d130fd4 441
mbed_official 0:51ac1d130fd4 442 /* no outgoing network interface could be found? */
mbed_official 0:51ac1d130fd4 443 if (netif == NULL) {
mbed_official 0:51ac1d130fd4 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed_official 0:51ac1d130fd4 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
mbed_official 0:51ac1d130fd4 446 UDP_STATS_INC(udp.rterr);
mbed_official 0:51ac1d130fd4 447 return ERR_RTE;
mbed_official 0:51ac1d130fd4 448 }
mbed_official 0:51ac1d130fd4 449 #if LWIP_CHECKSUM_ON_COPY
mbed_official 0:51ac1d130fd4 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
mbed_official 0:51ac1d130fd4 451 #else /* LWIP_CHECKSUM_ON_COPY */
mbed_official 0:51ac1d130fd4 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
mbed_official 0:51ac1d130fd4 453 #endif /* LWIP_CHECKSUM_ON_COPY */
mbed_official 0:51ac1d130fd4 454 }
mbed_official 0:51ac1d130fd4 455
mbed_official 0:51ac1d130fd4 456 /**
mbed_official 0:51ac1d130fd4 457 * Send data to a specified address using UDP.
mbed_official 0:51ac1d130fd4 458 * The netif used for sending can be specified.
mbed_official 0:51ac1d130fd4 459 *
mbed_official 0:51ac1d130fd4 460 * This function exists mainly for DHCP, to be able to send UDP packets
mbed_official 0:51ac1d130fd4 461 * on a netif that is still down.
mbed_official 0:51ac1d130fd4 462 *
mbed_official 0:51ac1d130fd4 463 * @param pcb UDP PCB used to send the data.
mbed_official 0:51ac1d130fd4 464 * @param p chain of pbuf's to be sent.
mbed_official 0:51ac1d130fd4 465 * @param dst_ip Destination IP address.
mbed_official 0:51ac1d130fd4 466 * @param dst_port Destination UDP port.
mbed_official 0:51ac1d130fd4 467 * @param netif the netif used for sending.
mbed_official 0:51ac1d130fd4 468 *
mbed_official 0:51ac1d130fd4 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
mbed_official 0:51ac1d130fd4 470 *
mbed_official 0:51ac1d130fd4 471 * @return lwIP error code (@see udp_send for possible error codes)
mbed_official 0:51ac1d130fd4 472 *
mbed_official 0:51ac1d130fd4 473 * @see udp_disconnect() udp_send()
mbed_official 0:51ac1d130fd4 474 */
mbed_official 0:51ac1d130fd4 475 err_t
mbed_official 0:51ac1d130fd4 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
mbed_official 0:51ac1d130fd4 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
mbed_official 0:51ac1d130fd4 478 {
mbed_official 0:51ac1d130fd4 479 #if LWIP_CHECKSUM_ON_COPY
mbed_official 0:51ac1d130fd4 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
mbed_official 0:51ac1d130fd4 481 }
mbed_official 0:51ac1d130fd4 482
mbed_official 0:51ac1d130fd4 483 /** Same as udp_sendto_if(), but with checksum */
mbed_official 0:51ac1d130fd4 484 err_t
mbed_official 0:51ac1d130fd4 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
mbed_official 0:51ac1d130fd4 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
mbed_official 0:51ac1d130fd4 487 u16_t chksum)
mbed_official 0:51ac1d130fd4 488 {
mbed_official 0:51ac1d130fd4 489 #endif /* LWIP_CHECKSUM_ON_COPY */
mbed_official 0:51ac1d130fd4 490 struct udp_hdr *udphdr;
mbed_official 0:51ac1d130fd4 491 ip_addr_t *src_ip;
mbed_official 0:51ac1d130fd4 492 err_t err;
mbed_official 0:51ac1d130fd4 493 struct pbuf *q; /* q will be sent down the stack */
mbed_official 0:51ac1d130fd4 494
mbed_official 0:51ac1d130fd4 495 #if IP_SOF_BROADCAST
mbed_official 0:51ac1d130fd4 496 /* broadcast filter? */
mbed_official 0:51ac1d130fd4 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
mbed_official 0:51ac1d130fd4 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mbed_official 0:51ac1d130fd4 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
mbed_official 0:51ac1d130fd4 500 return ERR_VAL;
mbed_official 0:51ac1d130fd4 501 }
mbed_official 0:51ac1d130fd4 502 #endif /* IP_SOF_BROADCAST */
mbed_official 0:51ac1d130fd4 503
mbed_official 0:51ac1d130fd4 504 /* if the PCB is not yet bound to a port, bind it here */
mbed_official 0:51ac1d130fd4 505 if (pcb->local_port == 0) {
mbed_official 0:51ac1d130fd4 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
mbed_official 0:51ac1d130fd4 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
mbed_official 0:51ac1d130fd4 508 if (err != ERR_OK) {
mbed_official 0:51ac1d130fd4 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
mbed_official 0:51ac1d130fd4 510 return err;
mbed_official 0:51ac1d130fd4 511 }
mbed_official 0:51ac1d130fd4 512 }
mbed_official 0:51ac1d130fd4 513
mbed_official 0:51ac1d130fd4 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
mbed_official 0:51ac1d130fd4 515 if (pbuf_header(p, UDP_HLEN)) {
mbed_official 0:51ac1d130fd4 516 /* allocate header in a separate new pbuf */
mbed_official 0:51ac1d130fd4 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
mbed_official 0:51ac1d130fd4 518 /* new header pbuf could not be allocated? */
mbed_official 0:51ac1d130fd4 519 if (q == NULL) {
mbed_official 0:51ac1d130fd4 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
mbed_official 0:51ac1d130fd4 521 return ERR_MEM;
mbed_official 0:51ac1d130fd4 522 }
mbed_official 0:51ac1d130fd4 523 if (p->tot_len != 0) {
mbed_official 0:51ac1d130fd4 524 /* chain header q in front of given pbuf p (only if p contains data) */
mbed_official 0:51ac1d130fd4 525 pbuf_chain(q, p);
mbed_official 0:51ac1d130fd4 526 }
mbed_official 0:51ac1d130fd4 527 /* first pbuf q points to header pbuf */
mbed_official 0:51ac1d130fd4 528 LWIP_DEBUGF(UDP_DEBUG,
mbed_official 0:51ac1d130fd4 529 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
mbed_official 0:51ac1d130fd4 530 } else {
mbed_official 0:51ac1d130fd4 531 /* adding space for header within p succeeded */
mbed_official 0:51ac1d130fd4 532 /* first pbuf q equals given pbuf */
mbed_official 0:51ac1d130fd4 533 q = p;
mbed_official 0:51ac1d130fd4 534 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
mbed_official 0:51ac1d130fd4 535 }
mbed_official 0:51ac1d130fd4 536 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
mbed_official 0:51ac1d130fd4 537 (q->len >= sizeof(struct udp_hdr)));
mbed_official 0:51ac1d130fd4 538 /* q now represents the packet to be sent */
mbed_official 0:51ac1d130fd4 539 udphdr = (struct udp_hdr *)q->payload;
mbed_official 0:51ac1d130fd4 540 udphdr->src = htons(pcb->local_port);
mbed_official 0:51ac1d130fd4 541 udphdr->dest = htons(dst_port);
mbed_official 0:51ac1d130fd4 542 /* in UDP, 0 checksum means 'no checksum' */
mbed_official 0:51ac1d130fd4 543 udphdr->chksum = 0x0000;
mbed_official 0:51ac1d130fd4 544
mbed_official 0:51ac1d130fd4 545 /* Multicast Loop? */
mbed_official 0:51ac1d130fd4 546 #if LWIP_IGMP
mbed_official 0:51ac1d130fd4 547 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
mbed_official 0:51ac1d130fd4 548 q->flags |= PBUF_FLAG_MCASTLOOP;
mbed_official 0:51ac1d130fd4 549 }
mbed_official 0:51ac1d130fd4 550 #endif /* LWIP_IGMP */
mbed_official 0:51ac1d130fd4 551
mbed_official 0:51ac1d130fd4 552
mbed_official 0:51ac1d130fd4 553 /* PCB local address is IP_ANY_ADDR? */
mbed_official 0:51ac1d130fd4 554 if (ip_addr_isany(&pcb->local_ip)) {
mbed_official 0:51ac1d130fd4 555 /* use outgoing network interface IP address as source address */
mbed_official 0:51ac1d130fd4 556 src_ip = &(netif->ip_addr);
mbed_official 0:51ac1d130fd4 557 } else {
mbed_official 0:51ac1d130fd4 558 /* check if UDP PCB local IP address is correct
mbed_official 0:51ac1d130fd4 559 * this could be an old address if netif->ip_addr has changed */
mbed_official 0:51ac1d130fd4 560 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
mbed_official 0:51ac1d130fd4 561 /* local_ip doesn't match, drop the packet */
mbed_official 0:51ac1d130fd4 562 if (q != p) {
mbed_official 0:51ac1d130fd4 563 /* free the header pbuf */
mbed_official 0:51ac1d130fd4 564 pbuf_free(q);
mbed_official 0:51ac1d130fd4 565 q = NULL;
mbed_official 0:51ac1d130fd4 566 /* p is still referenced by the caller, and will live on */
mbed_official 0:51ac1d130fd4 567 }
mbed_official 0:51ac1d130fd4 568 return ERR_VAL;
mbed_official 0:51ac1d130fd4 569 }
mbed_official 0:51ac1d130fd4 570 /* use UDP PCB local IP address as source address */
mbed_official 0:51ac1d130fd4 571 src_ip = &(pcb->local_ip);
mbed_official 0:51ac1d130fd4 572 }
mbed_official 0:51ac1d130fd4 573
mbed_official 0:51ac1d130fd4 574 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
mbed_official 0:51ac1d130fd4 575
mbed_official 0:51ac1d130fd4 576 #if LWIP_UDPLITE
mbed_official 0:51ac1d130fd4 577 /* UDP Lite protocol? */
mbed_official 0:51ac1d130fd4 578 if (pcb->flags & UDP_FLAGS_UDPLITE) {
mbed_official 0:51ac1d130fd4 579 u16_t chklen, chklen_hdr;
mbed_official 0:51ac1d130fd4 580 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
mbed_official 0:51ac1d130fd4 581 /* set UDP message length in UDP header */
mbed_official 0:51ac1d130fd4 582 chklen_hdr = chklen = pcb->chksum_len_tx;
mbed_official 0:51ac1d130fd4 583 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
mbed_official 0:51ac1d130fd4 584 if (chklen != 0) {
mbed_official 0:51ac1d130fd4 585 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
mbed_official 0:51ac1d130fd4 586 }
mbed_official 0:51ac1d130fd4 587 /* For UDP-Lite, checksum length of 0 means checksum
mbed_official 0:51ac1d130fd4 588 over the complete packet. (See RFC 3828 chap. 3.1)
mbed_official 0:51ac1d130fd4 589 At least the UDP-Lite header must be covered by the
mbed_official 0:51ac1d130fd4 590 checksum, therefore, if chksum_len has an illegal
mbed_official 0:51ac1d130fd4 591 value, we generate the checksum over the complete
mbed_official 0:51ac1d130fd4 592 packet to be safe. */
mbed_official 0:51ac1d130fd4 593 chklen_hdr = 0;
mbed_official 0:51ac1d130fd4 594 chklen = q->tot_len;
mbed_official 0:51ac1d130fd4 595 }
mbed_official 0:51ac1d130fd4 596 udphdr->len = htons(chklen_hdr);
mbed_official 0:51ac1d130fd4 597 /* calculate checksum */
mbed_official 0:51ac1d130fd4 598 #if CHECKSUM_GEN_UDP
mbed_official 0:51ac1d130fd4 599 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
mbed_official 0:51ac1d130fd4 600 IP_PROTO_UDPLITE, q->tot_len,
mbed_official 0:51ac1d130fd4 601 #if !LWIP_CHECKSUM_ON_COPY
mbed_official 0:51ac1d130fd4 602 chklen);
mbed_official 0:51ac1d130fd4 603 #else /* !LWIP_CHECKSUM_ON_COPY */
mbed_official 0:51ac1d130fd4 604 (have_chksum ? UDP_HLEN : chklen));
mbed_official 0:51ac1d130fd4 605 if (have_chksum) {
mbed_official 0:51ac1d130fd4 606 u32_t acc;
mbed_official 0:51ac1d130fd4 607 acc = udphdr->chksum + (u16_t)~(chksum);
mbed_official 0:51ac1d130fd4 608 udphdr->chksum = FOLD_U32T(acc);
mbed_official 0:51ac1d130fd4 609 }
mbed_official 0:51ac1d130fd4 610 #endif /* !LWIP_CHECKSUM_ON_COPY */
mbed_official 0:51ac1d130fd4 611
mbed_official 0:51ac1d130fd4 612 /* chksum zero must become 0xffff, as zero means 'no checksum' */
mbed_official 0:51ac1d130fd4 613 if (udphdr->chksum == 0x0000) {
mbed_official 0:51ac1d130fd4 614 udphdr->chksum = 0xffff;
mbed_official 0:51ac1d130fd4 615 }
mbed_official 0:51ac1d130fd4 616 #endif /* CHECKSUM_GEN_UDP */
mbed_official 0:51ac1d130fd4 617 /* output to IP */
mbed_official 0:51ac1d130fd4 618 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
mbed_official 0:51ac1d130fd4 619 #if LWIP_NETIF_HWADDRHINT
mbed_official 0:51ac1d130fd4 620 netif->addr_hint = &(pcb->addr_hint);
mbed_official 0:51ac1d130fd4 621 #endif /* LWIP_NETIF_HWADDRHINT*/
mbed_official 0:51ac1d130fd4 622 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
mbed_official 0:51ac1d130fd4 623 #if LWIP_NETIF_HWADDRHINT
mbed_official 0:51ac1d130fd4 624 netif->addr_hint = NULL;
mbed_official 0:51ac1d130fd4 625 #endif /* LWIP_NETIF_HWADDRHINT*/
mbed_official 0:51ac1d130fd4 626 } else
mbed_official 0:51ac1d130fd4 627 #endif /* LWIP_UDPLITE */
mbed_official 0:51ac1d130fd4 628 { /* UDP */
mbed_official 0:51ac1d130fd4 629 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
mbed_official 0:51ac1d130fd4 630 udphdr->len = htons(q->tot_len);
mbed_official 0:51ac1d130fd4 631 /* calculate checksum */
mbed_official 0:51ac1d130fd4 632 #if CHECKSUM_GEN_UDP
mbed_official 0:51ac1d130fd4 633 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
mbed_official 0:51ac1d130fd4 634 u16_t udpchksum;
mbed_official 0:51ac1d130fd4 635 #if LWIP_CHECKSUM_ON_COPY
mbed_official 0:51ac1d130fd4 636 if (have_chksum) {
mbed_official 0:51ac1d130fd4 637 u32_t acc;
mbed_official 0:51ac1d130fd4 638 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
mbed_official 0:51ac1d130fd4 639 q->tot_len, UDP_HLEN);
mbed_official 0:51ac1d130fd4 640 acc = udpchksum + (u16_t)~(chksum);
mbed_official 0:51ac1d130fd4 641 udpchksum = FOLD_U32T(acc);
mbed_official 0:51ac1d130fd4 642 } else
mbed_official 0:51ac1d130fd4 643 #endif /* LWIP_CHECKSUM_ON_COPY */
mbed_official 0:51ac1d130fd4 644 {
mbed_official 0:51ac1d130fd4 645 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
mbed_official 0:51ac1d130fd4 646 }
mbed_official 0:51ac1d130fd4 647
mbed_official 0:51ac1d130fd4 648 /* chksum zero must become 0xffff, as zero means 'no checksum' */
mbed_official 0:51ac1d130fd4 649 if (udpchksum == 0x0000) {
mbed_official 0:51ac1d130fd4 650 udpchksum = 0xffff;
mbed_official 0:51ac1d130fd4 651 }
mbed_official 0:51ac1d130fd4 652 udphdr->chksum = udpchksum;
mbed_official 0:51ac1d130fd4 653 }
mbed_official 0:51ac1d130fd4 654 #endif /* CHECKSUM_GEN_UDP */
mbed_official 0:51ac1d130fd4 655 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
mbed_official 0:51ac1d130fd4 656 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
mbed_official 0:51ac1d130fd4 657 /* output to IP */
mbed_official 0:51ac1d130fd4 658 #if LWIP_NETIF_HWADDRHINT
mbed_official 0:51ac1d130fd4 659 netif->addr_hint = &(pcb->addr_hint);
mbed_official 0:51ac1d130fd4 660 #endif /* LWIP_NETIF_HWADDRHINT*/
mbed_official 0:51ac1d130fd4 661 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
mbed_official 0:51ac1d130fd4 662 #if LWIP_NETIF_HWADDRHINT
mbed_official 0:51ac1d130fd4 663 netif->addr_hint = NULL;
mbed_official 0:51ac1d130fd4 664 #endif /* LWIP_NETIF_HWADDRHINT*/
mbed_official 0:51ac1d130fd4 665 }
mbed_official 0:51ac1d130fd4 666 /* TODO: must this be increased even if error occured? */
mbed_official 0:51ac1d130fd4 667 snmp_inc_udpoutdatagrams();
mbed_official 0:51ac1d130fd4 668
mbed_official 0:51ac1d130fd4 669 /* did we chain a separate header pbuf earlier? */
mbed_official 0:51ac1d130fd4 670 if (q != p) {
mbed_official 0:51ac1d130fd4 671 /* free the header pbuf */
mbed_official 0:51ac1d130fd4 672 pbuf_free(q);
mbed_official 0:51ac1d130fd4 673 q = NULL;
mbed_official 0:51ac1d130fd4 674 /* p is still referenced by the caller, and will live on */
mbed_official 0:51ac1d130fd4 675 }
mbed_official 0:51ac1d130fd4 676
mbed_official 0:51ac1d130fd4 677 UDP_STATS_INC(udp.xmit);
mbed_official 0:51ac1d130fd4 678 return err;
mbed_official 0:51ac1d130fd4 679 }
mbed_official 0:51ac1d130fd4 680
mbed_official 0:51ac1d130fd4 681 /**
mbed_official 0:51ac1d130fd4 682 * Bind an UDP PCB.
mbed_official 0:51ac1d130fd4 683 *
mbed_official 0:51ac1d130fd4 684 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
mbed_official 0:51ac1d130fd4 685 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
mbed_official 0:51ac1d130fd4 686 * bind to all local interfaces.
mbed_official 0:51ac1d130fd4 687 * @param port local UDP port to bind with. Use 0 to automatically bind
mbed_official 0:51ac1d130fd4 688 * to a random port between UDP_LOCAL_PORT_RANGE_START and
mbed_official 0:51ac1d130fd4 689 * UDP_LOCAL_PORT_RANGE_END.
mbed_official 0:51ac1d130fd4 690 *
mbed_official 0:51ac1d130fd4 691 * ipaddr & port are expected to be in the same byte order as in the pcb.
mbed_official 0:51ac1d130fd4 692 *
mbed_official 0:51ac1d130fd4 693 * @return lwIP error code.
mbed_official 0:51ac1d130fd4 694 * - ERR_OK. Successful. No error occured.
mbed_official 0:51ac1d130fd4 695 * - ERR_USE. The specified ipaddr and port are already bound to by
mbed_official 0:51ac1d130fd4 696 * another UDP PCB.
mbed_official 0:51ac1d130fd4 697 *
mbed_official 0:51ac1d130fd4 698 * @see udp_disconnect()
mbed_official 0:51ac1d130fd4 699 */
mbed_official 0:51ac1d130fd4 700 err_t
mbed_official 0:51ac1d130fd4 701 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
mbed_official 0:51ac1d130fd4 702 {
mbed_official 0:51ac1d130fd4 703 struct udp_pcb *ipcb;
mbed_official 0:51ac1d130fd4 704 u8_t rebind;
mbed_official 0:51ac1d130fd4 705
mbed_official 0:51ac1d130fd4 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
mbed_official 0:51ac1d130fd4 707 ip_addr_debug_print(UDP_DEBUG, ipaddr);
mbed_official 0:51ac1d130fd4 708 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
mbed_official 0:51ac1d130fd4 709
mbed_official 0:51ac1d130fd4 710 rebind = 0;
mbed_official 0:51ac1d130fd4 711 /* Check for double bind and rebind of the same pcb */
mbed_official 0:51ac1d130fd4 712 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
mbed_official 0:51ac1d130fd4 713 /* is this UDP PCB already on active list? */
mbed_official 0:51ac1d130fd4 714 if (pcb == ipcb) {
mbed_official 0:51ac1d130fd4 715 /* pcb may occur at most once in active list */
mbed_official 0:51ac1d130fd4 716 LWIP_ASSERT("rebind == 0", rebind == 0);
mbed_official 0:51ac1d130fd4 717 /* pcb already in list, just rebind */
mbed_official 0:51ac1d130fd4 718 rebind = 1;
mbed_official 0:51ac1d130fd4 719 }
mbed_official 0:51ac1d130fd4 720
mbed_official 0:51ac1d130fd4 721 /* By default, we don't allow to bind to a port that any other udp
mbed_official 0:51ac1d130fd4 722 PCB is alread bound to, unless *all* PCBs with that port have tha
mbed_official 0:51ac1d130fd4 723 REUSEADDR flag set. */
mbed_official 0:51ac1d130fd4 724 #if SO_REUSE
mbed_official 0:51ac1d130fd4 725 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
mbed_official 0:51ac1d130fd4 726 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
mbed_official 0:51ac1d130fd4 727 #else /* SO_REUSE */
mbed_official 0:51ac1d130fd4 728 /* port matches that of PCB in list and REUSEADDR not set -> reject */
mbed_official 0:51ac1d130fd4 729 else {
mbed_official 0:51ac1d130fd4 730 #endif /* SO_REUSE */
mbed_official 0:51ac1d130fd4 731 if ((ipcb->local_port == port) &&
mbed_official 0:51ac1d130fd4 732 /* IP address matches, or one is IP_ADDR_ANY? */
mbed_official 0:51ac1d130fd4 733 (ip_addr_isany(&(ipcb->local_ip)) ||
mbed_official 0:51ac1d130fd4 734 ip_addr_isany(ipaddr) ||
mbed_official 0:51ac1d130fd4 735 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
mbed_official 0:51ac1d130fd4 736 /* other PCB already binds to this local IP and port */
mbed_official 0:51ac1d130fd4 737 LWIP_DEBUGF(UDP_DEBUG,
mbed_official 0:51ac1d130fd4 738 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
mbed_official 0:51ac1d130fd4 739 return ERR_USE;
mbed_official 0:51ac1d130fd4 740 }
mbed_official 0:51ac1d130fd4 741 }
mbed_official 0:51ac1d130fd4 742 }
mbed_official 0:51ac1d130fd4 743
mbed_official 0:51ac1d130fd4 744 ip_addr_set(&pcb->local_ip, ipaddr);
mbed_official 0:51ac1d130fd4 745
mbed_official 0:51ac1d130fd4 746 /* no port specified? */
mbed_official 0:51ac1d130fd4 747 if (port == 0) {
mbed_official 0:51ac1d130fd4 748 #ifndef UDP_LOCAL_PORT_RANGE_START
mbed_official 0:51ac1d130fd4 749 /* From http://www.iana.org/assignments/port-numbers:
mbed_official 0:51ac1d130fd4 750 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
mbed_official 0:51ac1d130fd4 751 #define UDP_LOCAL_PORT_RANGE_START 0xc000
mbed_official 0:51ac1d130fd4 752 #define UDP_LOCAL_PORT_RANGE_END 0xffff
mbed_official 0:51ac1d130fd4 753 #endif
mbed_official 0:51ac1d130fd4 754 port = UDP_LOCAL_PORT_RANGE_START;
mbed_official 0:51ac1d130fd4 755 ipcb = udp_pcbs;
mbed_official 0:51ac1d130fd4 756 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
mbed_official 0:51ac1d130fd4 757 if (ipcb->local_port == port) {
mbed_official 0:51ac1d130fd4 758 /* port is already used by another udp_pcb */
mbed_official 0:51ac1d130fd4 759 port++;
mbed_official 0:51ac1d130fd4 760 /* restart scanning all udp pcbs */
mbed_official 0:51ac1d130fd4 761 ipcb = udp_pcbs;
mbed_official 0:51ac1d130fd4 762 } else {
mbed_official 0:51ac1d130fd4 763 /* go on with next udp pcb */
mbed_official 0:51ac1d130fd4 764 ipcb = ipcb->next;
mbed_official 0:51ac1d130fd4 765 }
mbed_official 0:51ac1d130fd4 766 }
mbed_official 0:51ac1d130fd4 767 if (ipcb != NULL) {
mbed_official 0:51ac1d130fd4 768 /* no more ports available in local range */
mbed_official 0:51ac1d130fd4 769 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
mbed_official 0:51ac1d130fd4 770 return ERR_USE;
mbed_official 0:51ac1d130fd4 771 }
mbed_official 0:51ac1d130fd4 772 }
mbed_official 0:51ac1d130fd4 773 pcb->local_port = port;
mbed_official 0:51ac1d130fd4 774 snmp_insert_udpidx_tree(pcb);
mbed_official 0:51ac1d130fd4 775 /* pcb not active yet? */
mbed_official 0:51ac1d130fd4 776 if (rebind == 0) {
mbed_official 0:51ac1d130fd4 777 /* place the PCB on the active list if not already there */
mbed_official 0:51ac1d130fd4 778 pcb->next = udp_pcbs;
mbed_official 0:51ac1d130fd4 779 udp_pcbs = pcb;
mbed_official 0:51ac1d130fd4 780 }
mbed_official 0:51ac1d130fd4 781 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
mbed_official 0:51ac1d130fd4 782 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
mbed_official 0:51ac1d130fd4 783 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed_official 0:51ac1d130fd4 784 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
mbed_official 0:51ac1d130fd4 785 pcb->local_port));
mbed_official 0:51ac1d130fd4 786 return ERR_OK;
mbed_official 0:51ac1d130fd4 787 }
mbed_official 0:51ac1d130fd4 788 /**
mbed_official 0:51ac1d130fd4 789 * Connect an UDP PCB.
mbed_official 0:51ac1d130fd4 790 *
mbed_official 0:51ac1d130fd4 791 * This will associate the UDP PCB with the remote address.
mbed_official 0:51ac1d130fd4 792 *
mbed_official 0:51ac1d130fd4 793 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
mbed_official 0:51ac1d130fd4 794 * @param ipaddr remote IP address to connect with.
mbed_official 0:51ac1d130fd4 795 * @param port remote UDP port to connect with.
mbed_official 0:51ac1d130fd4 796 *
mbed_official 0:51ac1d130fd4 797 * @return lwIP error code
mbed_official 0:51ac1d130fd4 798 *
mbed_official 0:51ac1d130fd4 799 * ipaddr & port are expected to be in the same byte order as in the pcb.
mbed_official 0:51ac1d130fd4 800 *
mbed_official 0:51ac1d130fd4 801 * The udp pcb is bound to a random local port if not already bound.
mbed_official 0:51ac1d130fd4 802 *
mbed_official 0:51ac1d130fd4 803 * @see udp_disconnect()
mbed_official 0:51ac1d130fd4 804 */
mbed_official 0:51ac1d130fd4 805 err_t
mbed_official 0:51ac1d130fd4 806 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
mbed_official 0:51ac1d130fd4 807 {
mbed_official 0:51ac1d130fd4 808 struct udp_pcb *ipcb;
mbed_official 0:51ac1d130fd4 809
mbed_official 0:51ac1d130fd4 810 if (pcb->local_port == 0) {
mbed_official 0:51ac1d130fd4 811 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
mbed_official 0:51ac1d130fd4 812 if (err != ERR_OK) {
mbed_official 0:51ac1d130fd4 813 return err;
mbed_official 0:51ac1d130fd4 814 }
mbed_official 0:51ac1d130fd4 815 }
mbed_official 0:51ac1d130fd4 816
mbed_official 0:51ac1d130fd4 817 ip_addr_set(&pcb->remote_ip, ipaddr);
mbed_official 0:51ac1d130fd4 818 pcb->remote_port = port;
mbed_official 0:51ac1d130fd4 819 pcb->flags |= UDP_FLAGS_CONNECTED;
mbed_official 0:51ac1d130fd4 820 /** TODO: this functionality belongs in upper layers */
mbed_official 0:51ac1d130fd4 821 #ifdef LWIP_UDP_TODO
mbed_official 0:51ac1d130fd4 822 /* Nail down local IP for netconn_addr()/getsockname() */
mbed_official 0:51ac1d130fd4 823 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
mbed_official 0:51ac1d130fd4 824 struct netif *netif;
mbed_official 0:51ac1d130fd4 825
mbed_official 0:51ac1d130fd4 826 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
mbed_official 0:51ac1d130fd4 827 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
mbed_official 0:51ac1d130fd4 828 UDP_STATS_INC(udp.rterr);
mbed_official 0:51ac1d130fd4 829 return ERR_RTE;
mbed_official 0:51ac1d130fd4 830 }
mbed_official 0:51ac1d130fd4 831 /** TODO: this will bind the udp pcb locally, to the interface which
mbed_official 0:51ac1d130fd4 832 is used to route output packets to the remote address. However, we
mbed_official 0:51ac1d130fd4 833 might want to accept incoming packets on any interface! */
mbed_official 0:51ac1d130fd4 834 pcb->local_ip = netif->ip_addr;
mbed_official 0:51ac1d130fd4 835 } else if (ip_addr_isany(&pcb->remote_ip)) {
mbed_official 0:51ac1d130fd4 836 pcb->local_ip.addr = 0;
mbed_official 0:51ac1d130fd4 837 }
mbed_official 0:51ac1d130fd4 838 #endif
mbed_official 0:51ac1d130fd4 839 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
mbed_official 0:51ac1d130fd4 840 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
mbed_official 0:51ac1d130fd4 841 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed_official 0:51ac1d130fd4 842 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
mbed_official 0:51ac1d130fd4 843 pcb->local_port));
mbed_official 0:51ac1d130fd4 844
mbed_official 0:51ac1d130fd4 845 /* Insert UDP PCB into the list of active UDP PCBs. */
mbed_official 0:51ac1d130fd4 846 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
mbed_official 0:51ac1d130fd4 847 if (pcb == ipcb) {
mbed_official 0:51ac1d130fd4 848 /* already on the list, just return */
mbed_official 0:51ac1d130fd4 849 return ERR_OK;
mbed_official 0:51ac1d130fd4 850 }
mbed_official 0:51ac1d130fd4 851 }
mbed_official 0:51ac1d130fd4 852 /* PCB not yet on the list, add PCB now */
mbed_official 0:51ac1d130fd4 853 pcb->next = udp_pcbs;
mbed_official 0:51ac1d130fd4 854 udp_pcbs = pcb;
mbed_official 0:51ac1d130fd4 855 return ERR_OK;
mbed_official 0:51ac1d130fd4 856 }
mbed_official 0:51ac1d130fd4 857
mbed_official 0:51ac1d130fd4 858 /**
mbed_official 0:51ac1d130fd4 859 * Disconnect a UDP PCB
mbed_official 0:51ac1d130fd4 860 *
mbed_official 0:51ac1d130fd4 861 * @param pcb the udp pcb to disconnect.
mbed_official 0:51ac1d130fd4 862 */
mbed_official 0:51ac1d130fd4 863 void
mbed_official 0:51ac1d130fd4 864 udp_disconnect(struct udp_pcb *pcb)
mbed_official 0:51ac1d130fd4 865 {
mbed_official 0:51ac1d130fd4 866 /* reset remote address association */
mbed_official 0:51ac1d130fd4 867 ip_addr_set_any(&pcb->remote_ip);
mbed_official 0:51ac1d130fd4 868 pcb->remote_port = 0;
mbed_official 0:51ac1d130fd4 869 /* mark PCB as unconnected */
mbed_official 0:51ac1d130fd4 870 pcb->flags &= ~UDP_FLAGS_CONNECTED;
mbed_official 0:51ac1d130fd4 871 }
mbed_official 0:51ac1d130fd4 872
mbed_official 0:51ac1d130fd4 873 /**
mbed_official 0:51ac1d130fd4 874 * Set a receive callback for a UDP PCB
mbed_official 0:51ac1d130fd4 875 *
mbed_official 0:51ac1d130fd4 876 * This callback will be called when receiving a datagram for the pcb.
mbed_official 0:51ac1d130fd4 877 *
mbed_official 0:51ac1d130fd4 878 * @param pcb the pcb for wich to set the recv callback
mbed_official 0:51ac1d130fd4 879 * @param recv function pointer of the callback function
mbed_official 0:51ac1d130fd4 880 * @param recv_arg additional argument to pass to the callback function
mbed_official 0:51ac1d130fd4 881 */
mbed_official 0:51ac1d130fd4 882 void
mbed_official 0:51ac1d130fd4 883 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
mbed_official 0:51ac1d130fd4 884 {
mbed_official 0:51ac1d130fd4 885 /* remember recv() callback and user data */
mbed_official 0:51ac1d130fd4 886 pcb->recv = recv;
mbed_official 0:51ac1d130fd4 887 pcb->recv_arg = recv_arg;
mbed_official 0:51ac1d130fd4 888 }
mbed_official 0:51ac1d130fd4 889
mbed_official 0:51ac1d130fd4 890 /**
mbed_official 0:51ac1d130fd4 891 * Remove an UDP PCB.
mbed_official 0:51ac1d130fd4 892 *
mbed_official 0:51ac1d130fd4 893 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
mbed_official 0:51ac1d130fd4 894 * UDP PCB's and the data structure is freed from memory.
mbed_official 0:51ac1d130fd4 895 *
mbed_official 0:51ac1d130fd4 896 * @see udp_new()
mbed_official 0:51ac1d130fd4 897 */
mbed_official 0:51ac1d130fd4 898 void
mbed_official 0:51ac1d130fd4 899 udp_remove(struct udp_pcb *pcb)
mbed_official 0:51ac1d130fd4 900 {
mbed_official 0:51ac1d130fd4 901 struct udp_pcb *pcb2;
mbed_official 0:51ac1d130fd4 902
mbed_official 0:51ac1d130fd4 903 snmp_delete_udpidx_tree(pcb);
mbed_official 0:51ac1d130fd4 904 /* pcb to be removed is first in list? */
mbed_official 0:51ac1d130fd4 905 if (udp_pcbs == pcb) {
mbed_official 0:51ac1d130fd4 906 /* make list start at 2nd pcb */
mbed_official 0:51ac1d130fd4 907 udp_pcbs = udp_pcbs->next;
mbed_official 0:51ac1d130fd4 908 /* pcb not 1st in list */
mbed_official 0:51ac1d130fd4 909 } else {
mbed_official 0:51ac1d130fd4 910 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
mbed_official 0:51ac1d130fd4 911 /* find pcb in udp_pcbs list */
mbed_official 0:51ac1d130fd4 912 if (pcb2->next != NULL && pcb2->next == pcb) {
mbed_official 0:51ac1d130fd4 913 /* remove pcb from list */
mbed_official 0:51ac1d130fd4 914 pcb2->next = pcb->next;
mbed_official 0:51ac1d130fd4 915 }
mbed_official 0:51ac1d130fd4 916 }
mbed_official 0:51ac1d130fd4 917 }
mbed_official 0:51ac1d130fd4 918 memp_free(MEMP_UDP_PCB, pcb);
mbed_official 0:51ac1d130fd4 919 }
mbed_official 0:51ac1d130fd4 920
mbed_official 0:51ac1d130fd4 921 /**
mbed_official 0:51ac1d130fd4 922 * Create a UDP PCB.
mbed_official 0:51ac1d130fd4 923 *
mbed_official 0:51ac1d130fd4 924 * @return The UDP PCB which was created. NULL if the PCB data structure
mbed_official 0:51ac1d130fd4 925 * could not be allocated.
mbed_official 0:51ac1d130fd4 926 *
mbed_official 0:51ac1d130fd4 927 * @see udp_remove()
mbed_official 0:51ac1d130fd4 928 */
mbed_official 0:51ac1d130fd4 929 struct udp_pcb *
mbed_official 0:51ac1d130fd4 930 udp_new(void)
mbed_official 0:51ac1d130fd4 931 {
mbed_official 0:51ac1d130fd4 932 struct udp_pcb *pcb;
mbed_official 0:51ac1d130fd4 933 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
mbed_official 0:51ac1d130fd4 934 /* could allocate UDP PCB? */
mbed_official 0:51ac1d130fd4 935 if (pcb != NULL) {
mbed_official 0:51ac1d130fd4 936 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
mbed_official 0:51ac1d130fd4 937 * which means checksum is generated over the whole datagram per default
mbed_official 0:51ac1d130fd4 938 * (recommended as default by RFC 3828). */
mbed_official 0:51ac1d130fd4 939 /* initialize PCB to all zeroes */
mbed_official 0:51ac1d130fd4 940 memset(pcb, 0, sizeof(struct udp_pcb));
mbed_official 0:51ac1d130fd4 941 pcb->ttl = UDP_TTL;
mbed_official 0:51ac1d130fd4 942 }
mbed_official 0:51ac1d130fd4 943 return pcb;
mbed_official 0:51ac1d130fd4 944 }
mbed_official 0:51ac1d130fd4 945
mbed_official 0:51ac1d130fd4 946 #if UDP_DEBUG
mbed_official 0:51ac1d130fd4 947 /**
mbed_official 0:51ac1d130fd4 948 * Print UDP header information for debug purposes.
mbed_official 0:51ac1d130fd4 949 *
mbed_official 0:51ac1d130fd4 950 * @param udphdr pointer to the udp header in memory.
mbed_official 0:51ac1d130fd4 951 */
mbed_official 0:51ac1d130fd4 952 void
mbed_official 0:51ac1d130fd4 953 udp_debug_print(struct udp_hdr *udphdr)
mbed_official 0:51ac1d130fd4 954 {
mbed_official 0:51ac1d130fd4 955 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
mbed_official 0:51ac1d130fd4 956 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 957 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
mbed_official 0:51ac1d130fd4 958 ntohs(udphdr->src), ntohs(udphdr->dest)));
mbed_official 0:51ac1d130fd4 959 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 960 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
mbed_official 0:51ac1d130fd4 961 ntohs(udphdr->len), ntohs(udphdr->chksum)));
mbed_official 0:51ac1d130fd4 962 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 963 }
mbed_official 0:51ac1d130fd4 964 #endif /* UDP_DEBUG */
mbed_official 0:51ac1d130fd4 965
mbed_official 0:51ac1d130fd4 966 #endif /* LWIP_UDP */