Nino Der Kinderen / Mbed 2 deprecated InetTest

Embedded C project:18/12/2014

Dependencies:   DS1307 TextLCD mbed

NetServices/lwip/core/udp.c@0:8d87bc453349, 2014-12-18 (annotated)

Committer:
ninoderkinderen
Date:
Thu Dec 18 09:35:49 2014 +0000
Revision:
0:8d87bc453349
Programma embedded C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ninoderkinderen 0:8d87bc453349 1 /**
ninoderkinderen 0:8d87bc453349 2 * @file
ninoderkinderen 0:8d87bc453349 3 * User Datagram Protocol module
ninoderkinderen 0:8d87bc453349 4 *
ninoderkinderen 0:8d87bc453349 5 */
ninoderkinderen 0:8d87bc453349 6
ninoderkinderen 0:8d87bc453349 7 /*
ninoderkinderen 0:8d87bc453349 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
ninoderkinderen 0:8d87bc453349 9 * All rights reserved.
ninoderkinderen 0:8d87bc453349 10 *
ninoderkinderen 0:8d87bc453349 11 * Redistribution and use in source and binary forms, with or without modification,
ninoderkinderen 0:8d87bc453349 12 * are permitted provided that the following conditions are met:
ninoderkinderen 0:8d87bc453349 13 *
ninoderkinderen 0:8d87bc453349 14 * 1. Redistributions of source code must retain the above copyright notice,
ninoderkinderen 0:8d87bc453349 15 * this list of conditions and the following disclaimer.
ninoderkinderen 0:8d87bc453349 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
ninoderkinderen 0:8d87bc453349 17 * this list of conditions and the following disclaimer in the documentation
ninoderkinderen 0:8d87bc453349 18 * and/or other materials provided with the distribution.
ninoderkinderen 0:8d87bc453349 19 * 3. The name of the author may not be used to endorse or promote products
ninoderkinderen 0:8d87bc453349 20 * derived from this software without specific prior written permission.
ninoderkinderen 0:8d87bc453349 21 *
ninoderkinderen 0:8d87bc453349 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
ninoderkinderen 0:8d87bc453349 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
ninoderkinderen 0:8d87bc453349 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
ninoderkinderen 0:8d87bc453349 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ninoderkinderen 0:8d87bc453349 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
ninoderkinderen 0:8d87bc453349 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ninoderkinderen 0:8d87bc453349 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ninoderkinderen 0:8d87bc453349 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
ninoderkinderen 0:8d87bc453349 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
ninoderkinderen 0:8d87bc453349 31 * OF SUCH DAMAGE.
ninoderkinderen 0:8d87bc453349 32 *
ninoderkinderen 0:8d87bc453349 33 * This file is part of the lwIP TCP/IP stack.
ninoderkinderen 0:8d87bc453349 34 *
ninoderkinderen 0:8d87bc453349 35 * Author: Adam Dunkels <adam@sics.se>
ninoderkinderen 0:8d87bc453349 36 *
ninoderkinderen 0:8d87bc453349 37 */
ninoderkinderen 0:8d87bc453349 38
ninoderkinderen 0:8d87bc453349 39
ninoderkinderen 0:8d87bc453349 40 /* udp.c
ninoderkinderen 0:8d87bc453349 41 *
ninoderkinderen 0:8d87bc453349 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
ninoderkinderen 0:8d87bc453349 43 *
ninoderkinderen 0:8d87bc453349 44 */
ninoderkinderen 0:8d87bc453349 45
ninoderkinderen 0:8d87bc453349 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
ninoderkinderen 0:8d87bc453349 47 */
ninoderkinderen 0:8d87bc453349 48
ninoderkinderen 0:8d87bc453349 49 #include "lwip/opt.h"
ninoderkinderen 0:8d87bc453349 50
ninoderkinderen 0:8d87bc453349 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
ninoderkinderen 0:8d87bc453349 52
ninoderkinderen 0:8d87bc453349 53 #include "lwip/udp.h"
ninoderkinderen 0:8d87bc453349 54 #include "lwip/def.h"
ninoderkinderen 0:8d87bc453349 55 #include "lwip/memp.h"
ninoderkinderen 0:8d87bc453349 56 #include "lwip/inet_chksum.h"
ninoderkinderen 0:8d87bc453349 57 #include "lwip/ip_addr.h"
ninoderkinderen 0:8d87bc453349 58 #include "lwip/netif.h"
ninoderkinderen 0:8d87bc453349 59 #include "lwip/icmp.h"
ninoderkinderen 0:8d87bc453349 60 #include "lwip/stats.h"
ninoderkinderen 0:8d87bc453349 61 #include "lwip/snmp.h"
ninoderkinderen 0:8d87bc453349 62 #include "arch/perf.h"
ninoderkinderen 0:8d87bc453349 63 #include "lwip/dhcp.h"
ninoderkinderen 0:8d87bc453349 64
ninoderkinderen 0:8d87bc453349 65 #include <string.h>
ninoderkinderen 0:8d87bc453349 66
ninoderkinderen 0:8d87bc453349 67 /* The list of UDP PCBs */
ninoderkinderen 0:8d87bc453349 68 /* exported in udp.h (was static) */
ninoderkinderen 0:8d87bc453349 69 struct udp_pcb *udp_pcbs;
ninoderkinderen 0:8d87bc453349 70
ninoderkinderen 0:8d87bc453349 71 /**
ninoderkinderen 0:8d87bc453349 72 * Process an incoming UDP datagram.
ninoderkinderen 0:8d87bc453349 73 *
ninoderkinderen 0:8d87bc453349 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
ninoderkinderen 0:8d87bc453349 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
ninoderkinderen 0:8d87bc453349 76 * recv function. If no pcb is found or the datagram is incorrect, the
ninoderkinderen 0:8d87bc453349 77 * pbuf is freed.
ninoderkinderen 0:8d87bc453349 78 *
ninoderkinderen 0:8d87bc453349 79 * @param p pbuf to be demultiplexed to a UDP PCB.
ninoderkinderen 0:8d87bc453349 80 * @param inp network interface on which the datagram was received.
ninoderkinderen 0:8d87bc453349 81 *
ninoderkinderen 0:8d87bc453349 82 */
ninoderkinderen 0:8d87bc453349 83 void
ninoderkinderen 0:8d87bc453349 84 udp_input(struct pbuf *p, struct netif *inp)
ninoderkinderen 0:8d87bc453349 85 {
ninoderkinderen 0:8d87bc453349 86 struct udp_hdr *udphdr;
ninoderkinderen 0:8d87bc453349 87 struct udp_pcb *pcb, *prev;
ninoderkinderen 0:8d87bc453349 88 struct udp_pcb *uncon_pcb;
ninoderkinderen 0:8d87bc453349 89 struct ip_hdr *iphdr;
ninoderkinderen 0:8d87bc453349 90 u16_t src, dest;
ninoderkinderen 0:8d87bc453349 91 u8_t local_match;
ninoderkinderen 0:8d87bc453349 92 u8_t broadcast;
ninoderkinderen 0:8d87bc453349 93
ninoderkinderen 0:8d87bc453349 94 PERF_START;
ninoderkinderen 0:8d87bc453349 95
ninoderkinderen 0:8d87bc453349 96 UDP_STATS_INC(udp.recv);
ninoderkinderen 0:8d87bc453349 97
ninoderkinderen 0:8d87bc453349 98 iphdr = (struct ip_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 99
ninoderkinderen 0:8d87bc453349 100 /* Check minimum length (IP header + UDP header)
ninoderkinderen 0:8d87bc453349 101 * and move payload pointer to UDP header */
ninoderkinderen 0:8d87bc453349 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
ninoderkinderen 0:8d87bc453349 103 /* drop short packets */
ninoderkinderen 0:8d87bc453349 104 LWIP_DEBUGF(UDP_DEBUG,
ninoderkinderen 0:8d87bc453349 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
ninoderkinderen 0:8d87bc453349 106 UDP_STATS_INC(udp.lenerr);
ninoderkinderen 0:8d87bc453349 107 UDP_STATS_INC(udp.drop);
ninoderkinderen 0:8d87bc453349 108 snmp_inc_udpinerrors();
ninoderkinderen 0:8d87bc453349 109 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 110 goto end;
ninoderkinderen 0:8d87bc453349 111 }
ninoderkinderen 0:8d87bc453349 112
ninoderkinderen 0:8d87bc453349 113 udphdr = (struct udp_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 114
ninoderkinderen 0:8d87bc453349 115 /* is broadcast packet ? */
ninoderkinderen 0:8d87bc453349 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
ninoderkinderen 0:8d87bc453349 117
ninoderkinderen 0:8d87bc453349 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
ninoderkinderen 0:8d87bc453349 119
ninoderkinderen 0:8d87bc453349 120 /* convert src and dest ports to host byte order */
ninoderkinderen 0:8d87bc453349 121 src = ntohs(udphdr->src);
ninoderkinderen 0:8d87bc453349 122 dest = ntohs(udphdr->dest);
ninoderkinderen 0:8d87bc453349 123
ninoderkinderen 0:8d87bc453349 124 udp_debug_print(udphdr);
ninoderkinderen 0:8d87bc453349 125
ninoderkinderen 0:8d87bc453349 126 /* print the UDP source and destination */
ninoderkinderen 0:8d87bc453349 127 LWIP_DEBUGF(UDP_DEBUG,
ninoderkinderen 0:8d87bc453349 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
ninoderkinderen 0:8d87bc453349 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
ninoderkinderen 0:8d87bc453349 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
ninoderkinderen 0:8d87bc453349 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
ninoderkinderen 0:8d87bc453349 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
ninoderkinderen 0:8d87bc453349 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
ninoderkinderen 0:8d87bc453349 134
ninoderkinderen 0:8d87bc453349 135 #if LWIP_DHCP
ninoderkinderen 0:8d87bc453349 136 pcb = NULL;
ninoderkinderen 0:8d87bc453349 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
ninoderkinderen 0:8d87bc453349 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
ninoderkinderen 0:8d87bc453349 139 if (dest == DHCP_CLIENT_PORT) {
ninoderkinderen 0:8d87bc453349 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
ninoderkinderen 0:8d87bc453349 141 if (src == DHCP_SERVER_PORT) {
ninoderkinderen 0:8d87bc453349 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
ninoderkinderen 0:8d87bc453349 143 /* accept the packe if
ninoderkinderen 0:8d87bc453349 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
ninoderkinderen 0:8d87bc453349 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
ninoderkinderen 0:8d87bc453349 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
ninoderkinderen 0:8d87bc453349 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
ninoderkinderen 0:8d87bc453349 148 pcb = inp->dhcp->pcb;
ninoderkinderen 0:8d87bc453349 149 }
ninoderkinderen 0:8d87bc453349 150 }
ninoderkinderen 0:8d87bc453349 151 }
ninoderkinderen 0:8d87bc453349 152 } else
ninoderkinderen 0:8d87bc453349 153 #endif /* LWIP_DHCP */
ninoderkinderen 0:8d87bc453349 154 {
ninoderkinderen 0:8d87bc453349 155 prev = NULL;
ninoderkinderen 0:8d87bc453349 156 local_match = 0;
ninoderkinderen 0:8d87bc453349 157 uncon_pcb = NULL;
ninoderkinderen 0:8d87bc453349 158 /* Iterate through the UDP pcb list for a matching pcb.
ninoderkinderen 0:8d87bc453349 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
ninoderkinderen 0:8d87bc453349 160 * preferred. If no perfect match is found, the first unconnected pcb that
ninoderkinderen 0:8d87bc453349 161 * matches the local port and ip address gets the datagram. */
ninoderkinderen 0:8d87bc453349 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
ninoderkinderen 0:8d87bc453349 163 local_match = 0;
ninoderkinderen 0:8d87bc453349 164 /* print the PCB local and remote address */
ninoderkinderen 0:8d87bc453349 165 LWIP_DEBUGF(UDP_DEBUG,
ninoderkinderen 0:8d87bc453349 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
ninoderkinderen 0:8d87bc453349 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
ninoderkinderen 0:8d87bc453349 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
ninoderkinderen 0:8d87bc453349 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
ninoderkinderen 0:8d87bc453349 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
ninoderkinderen 0:8d87bc453349 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
ninoderkinderen 0:8d87bc453349 172
ninoderkinderen 0:8d87bc453349 173 /* compare PCB local addr+port to UDP destination addr+port */
ninoderkinderen 0:8d87bc453349 174 if ((pcb->local_port == dest) &&
ninoderkinderen 0:8d87bc453349 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
ninoderkinderen 0:8d87bc453349 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
ninoderkinderen 0:8d87bc453349 177 #if LWIP_IGMP
ninoderkinderen 0:8d87bc453349 178 ip_addr_ismulticast(&current_iphdr_dest) ||
ninoderkinderen 0:8d87bc453349 179 #endif /* LWIP_IGMP */
ninoderkinderen 0:8d87bc453349 180 #if IP_SOF_BROADCAST_RECV
ninoderkinderen 0:8d87bc453349 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
ninoderkinderen 0:8d87bc453349 182 #else /* IP_SOF_BROADCAST_RECV */
ninoderkinderen 0:8d87bc453349 183 (broadcast))) {
ninoderkinderen 0:8d87bc453349 184 #endif /* IP_SOF_BROADCAST_RECV */
ninoderkinderen 0:8d87bc453349 185 local_match = 1;
ninoderkinderen 0:8d87bc453349 186 if ((uncon_pcb == NULL) &&
ninoderkinderen 0:8d87bc453349 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
ninoderkinderen 0:8d87bc453349 188 /* the first unconnected matching PCB */
ninoderkinderen 0:8d87bc453349 189 uncon_pcb = pcb;
ninoderkinderen 0:8d87bc453349 190 }
ninoderkinderen 0:8d87bc453349 191 }
ninoderkinderen 0:8d87bc453349 192 /* compare PCB remote addr+port to UDP source addr+port */
ninoderkinderen 0:8d87bc453349 193 if ((local_match != 0) &&
ninoderkinderen 0:8d87bc453349 194 (pcb->remote_port == src) &&
ninoderkinderen 0:8d87bc453349 195 (ip_addr_isany(&pcb->remote_ip) ||
ninoderkinderen 0:8d87bc453349 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
ninoderkinderen 0:8d87bc453349 197 /* the first fully matching PCB */
ninoderkinderen 0:8d87bc453349 198 if (prev != NULL) {
ninoderkinderen 0:8d87bc453349 199 /* move the pcb to the front of udp_pcbs so that is
ninoderkinderen 0:8d87bc453349 200 found faster next time */
ninoderkinderen 0:8d87bc453349 201 prev->next = pcb->next;
ninoderkinderen 0:8d87bc453349 202 pcb->next = udp_pcbs;
ninoderkinderen 0:8d87bc453349 203 udp_pcbs = pcb;
ninoderkinderen 0:8d87bc453349 204 } else {
ninoderkinderen 0:8d87bc453349 205 UDP_STATS_INC(udp.cachehit);
ninoderkinderen 0:8d87bc453349 206 }
ninoderkinderen 0:8d87bc453349 207 break;
ninoderkinderen 0:8d87bc453349 208 }
ninoderkinderen 0:8d87bc453349 209 prev = pcb;
ninoderkinderen 0:8d87bc453349 210 }
ninoderkinderen 0:8d87bc453349 211 /* no fully matching pcb found? then look for an unconnected pcb */
ninoderkinderen 0:8d87bc453349 212 if (pcb == NULL) {
ninoderkinderen 0:8d87bc453349 213 pcb = uncon_pcb;
ninoderkinderen 0:8d87bc453349 214 }
ninoderkinderen 0:8d87bc453349 215 }
ninoderkinderen 0:8d87bc453349 216
ninoderkinderen 0:8d87bc453349 217 /* Check checksum if this is a match or if it was directed at us. */
ninoderkinderen 0:8d87bc453349 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
ninoderkinderen 0:8d87bc453349 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
ninoderkinderen 0:8d87bc453349 220 #if LWIP_UDPLITE
ninoderkinderen 0:8d87bc453349 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
ninoderkinderen 0:8d87bc453349 222 /* Do the UDP Lite checksum */
ninoderkinderen 0:8d87bc453349 223 #if CHECKSUM_CHECK_UDP
ninoderkinderen 0:8d87bc453349 224 u16_t chklen = ntohs(udphdr->len);
ninoderkinderen 0:8d87bc453349 225 if (chklen < sizeof(struct udp_hdr)) {
ninoderkinderen 0:8d87bc453349 226 if (chklen == 0) {
ninoderkinderen 0:8d87bc453349 227 /* For UDP-Lite, checksum length of 0 means checksum
ninoderkinderen 0:8d87bc453349 228 over the complete packet (See RFC 3828 chap. 3.1) */
ninoderkinderen 0:8d87bc453349 229 chklen = p->tot_len;
ninoderkinderen 0:8d87bc453349 230 } else {
ninoderkinderen 0:8d87bc453349 231 /* At least the UDP-Lite header must be covered by the
ninoderkinderen 0:8d87bc453349 232 checksum! (Again, see RFC 3828 chap. 3.1) */
ninoderkinderen 0:8d87bc453349 233 UDP_STATS_INC(udp.chkerr);
ninoderkinderen 0:8d87bc453349 234 UDP_STATS_INC(udp.drop);
ninoderkinderen 0:8d87bc453349 235 snmp_inc_udpinerrors();
ninoderkinderen 0:8d87bc453349 236 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 237 goto end;
ninoderkinderen 0:8d87bc453349 238 }
ninoderkinderen 0:8d87bc453349 239 }
ninoderkinderen 0:8d87bc453349 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
ninoderkinderen 0:8d87bc453349 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
ninoderkinderen 0:8d87bc453349 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
ninoderkinderen 0:8d87bc453349 244 UDP_STATS_INC(udp.chkerr);
ninoderkinderen 0:8d87bc453349 245 UDP_STATS_INC(udp.drop);
ninoderkinderen 0:8d87bc453349 246 snmp_inc_udpinerrors();
ninoderkinderen 0:8d87bc453349 247 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 248 goto end;
ninoderkinderen 0:8d87bc453349 249 }
ninoderkinderen 0:8d87bc453349 250 #endif /* CHECKSUM_CHECK_UDP */
ninoderkinderen 0:8d87bc453349 251 } else
ninoderkinderen 0:8d87bc453349 252 #endif /* LWIP_UDPLITE */
ninoderkinderen 0:8d87bc453349 253 {
ninoderkinderen 0:8d87bc453349 254 #if CHECKSUM_CHECK_UDP
ninoderkinderen 0:8d87bc453349 255 if (udphdr->chksum != 0) {
ninoderkinderen 0:8d87bc453349 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
ninoderkinderen 0:8d87bc453349 257 IP_PROTO_UDP, p->tot_len) != 0) {
ninoderkinderen 0:8d87bc453349 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
ninoderkinderen 0:8d87bc453349 260 UDP_STATS_INC(udp.chkerr);
ninoderkinderen 0:8d87bc453349 261 UDP_STATS_INC(udp.drop);
ninoderkinderen 0:8d87bc453349 262 snmp_inc_udpinerrors();
ninoderkinderen 0:8d87bc453349 263 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 264 goto end;
ninoderkinderen 0:8d87bc453349 265 }
ninoderkinderen 0:8d87bc453349 266 }
ninoderkinderen 0:8d87bc453349 267 #endif /* CHECKSUM_CHECK_UDP */
ninoderkinderen 0:8d87bc453349 268 }
ninoderkinderen 0:8d87bc453349 269 if(pbuf_header(p, -UDP_HLEN)) {
ninoderkinderen 0:8d87bc453349 270 /* Can we cope with this failing? Just assert for now */
ninoderkinderen 0:8d87bc453349 271 LWIP_ASSERT("pbuf_header failed\n", 0);
ninoderkinderen 0:8d87bc453349 272 UDP_STATS_INC(udp.drop);
ninoderkinderen 0:8d87bc453349 273 snmp_inc_udpinerrors();
ninoderkinderen 0:8d87bc453349 274 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 275 goto end;
ninoderkinderen 0:8d87bc453349 276 }
ninoderkinderen 0:8d87bc453349 277 if (pcb != NULL) {
ninoderkinderen 0:8d87bc453349 278 snmp_inc_udpindatagrams();
ninoderkinderen 0:8d87bc453349 279 #if SO_REUSE && SO_REUSE_RXTOALL
ninoderkinderen 0:8d87bc453349 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
ninoderkinderen 0:8d87bc453349 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
ninoderkinderen 0:8d87bc453349 282 /* pass broadcast- or multicast packets to all multicast pcbs
ninoderkinderen 0:8d87bc453349 283 if SOF_REUSEADDR is set on the first match */
ninoderkinderen 0:8d87bc453349 284 struct udp_pcb *mpcb;
ninoderkinderen 0:8d87bc453349 285 u8_t p_header_changed = 0;
ninoderkinderen 0:8d87bc453349 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
ninoderkinderen 0:8d87bc453349 287 if (mpcb != pcb) {
ninoderkinderen 0:8d87bc453349 288 /* compare PCB local addr+port to UDP destination addr+port */
ninoderkinderen 0:8d87bc453349 289 if ((mpcb->local_port == dest) &&
ninoderkinderen 0:8d87bc453349 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
ninoderkinderen 0:8d87bc453349 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
ninoderkinderen 0:8d87bc453349 292 #if LWIP_IGMP
ninoderkinderen 0:8d87bc453349 293 ip_addr_ismulticast(&current_iphdr_dest) ||
ninoderkinderen 0:8d87bc453349 294 #endif /* LWIP_IGMP */
ninoderkinderen 0:8d87bc453349 295 #if IP_SOF_BROADCAST_RECV
ninoderkinderen 0:8d87bc453349 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
ninoderkinderen 0:8d87bc453349 297 #else /* IP_SOF_BROADCAST_RECV */
ninoderkinderen 0:8d87bc453349 298 (broadcast))) {
ninoderkinderen 0:8d87bc453349 299 #endif /* IP_SOF_BROADCAST_RECV */
ninoderkinderen 0:8d87bc453349 300 /* pass a copy of the packet to all local matches */
ninoderkinderen 0:8d87bc453349 301 if (mpcb->recv != NULL) {
ninoderkinderen 0:8d87bc453349 302 struct pbuf *q;
ninoderkinderen 0:8d87bc453349 303 /* for that, move payload to IP header again */
ninoderkinderen 0:8d87bc453349 304 if (p_header_changed == 0) {
ninoderkinderen 0:8d87bc453349 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
ninoderkinderen 0:8d87bc453349 306 p_header_changed = 1;
ninoderkinderen 0:8d87bc453349 307 }
ninoderkinderen 0:8d87bc453349 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
ninoderkinderen 0:8d87bc453349 309 if (q != NULL) {
ninoderkinderen 0:8d87bc453349 310 err_t err = pbuf_copy(q, p);
ninoderkinderen 0:8d87bc453349 311 if (err == ERR_OK) {
ninoderkinderen 0:8d87bc453349 312 /* move payload to UDP data */
ninoderkinderen 0:8d87bc453349 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
ninoderkinderen 0:8d87bc453349 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
ninoderkinderen 0:8d87bc453349 315 }
ninoderkinderen 0:8d87bc453349 316 }
ninoderkinderen 0:8d87bc453349 317 }
ninoderkinderen 0:8d87bc453349 318 }
ninoderkinderen 0:8d87bc453349 319 }
ninoderkinderen 0:8d87bc453349 320 }
ninoderkinderen 0:8d87bc453349 321 if (p_header_changed) {
ninoderkinderen 0:8d87bc453349 322 /* and move payload to UDP data again */
ninoderkinderen 0:8d87bc453349 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
ninoderkinderen 0:8d87bc453349 324 }
ninoderkinderen 0:8d87bc453349 325 }
ninoderkinderen 0:8d87bc453349 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
ninoderkinderen 0:8d87bc453349 327 /* callback */
ninoderkinderen 0:8d87bc453349 328 if (pcb->recv != NULL) {
ninoderkinderen 0:8d87bc453349 329 /* now the recv function is responsible for freeing p */
ninoderkinderen 0:8d87bc453349 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
ninoderkinderen 0:8d87bc453349 331 } else {
ninoderkinderen 0:8d87bc453349 332 /* no recv function registered? then we have to free the pbuf! */
ninoderkinderen 0:8d87bc453349 333 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 334 goto end;
ninoderkinderen 0:8d87bc453349 335 }
ninoderkinderen 0:8d87bc453349 336 } else {
ninoderkinderen 0:8d87bc453349 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
ninoderkinderen 0:8d87bc453349 338
ninoderkinderen 0:8d87bc453349 339 #if LWIP_ICMP
ninoderkinderen 0:8d87bc453349 340 /* No match was found, send ICMP destination port unreachable unless
ninoderkinderen 0:8d87bc453349 341 destination address was broadcast/multicast. */
ninoderkinderen 0:8d87bc453349 342 if (!broadcast &&
ninoderkinderen 0:8d87bc453349 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
ninoderkinderen 0:8d87bc453349 344 /* move payload pointer back to ip header */
ninoderkinderen 0:8d87bc453349 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
ninoderkinderen 0:8d87bc453349 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
ninoderkinderen 0:8d87bc453349 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
ninoderkinderen 0:8d87bc453349 348 }
ninoderkinderen 0:8d87bc453349 349 #endif /* LWIP_ICMP */
ninoderkinderen 0:8d87bc453349 350 UDP_STATS_INC(udp.proterr);
ninoderkinderen 0:8d87bc453349 351 UDP_STATS_INC(udp.drop);
ninoderkinderen 0:8d87bc453349 352 snmp_inc_udpnoports();
ninoderkinderen 0:8d87bc453349 353 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 354 }
ninoderkinderen 0:8d87bc453349 355 } else {
ninoderkinderen 0:8d87bc453349 356 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 357 }
ninoderkinderen 0:8d87bc453349 358 end:
ninoderkinderen 0:8d87bc453349 359 PERF_STOP("udp_input");
ninoderkinderen 0:8d87bc453349 360 }
ninoderkinderen 0:8d87bc453349 361
ninoderkinderen 0:8d87bc453349 362 /**
ninoderkinderen 0:8d87bc453349 363 * Send data using UDP.
ninoderkinderen 0:8d87bc453349 364 *
ninoderkinderen 0:8d87bc453349 365 * @param pcb UDP PCB used to send the data.
ninoderkinderen 0:8d87bc453349 366 * @param p chain of pbuf's to be sent.
ninoderkinderen 0:8d87bc453349 367 *
ninoderkinderen 0:8d87bc453349 368 * The datagram will be sent to the current remote_ip & remote_port
ninoderkinderen 0:8d87bc453349 369 * stored in pcb. If the pcb is not bound to a port, it will
ninoderkinderen 0:8d87bc453349 370 * automatically be bound to a random port.
ninoderkinderen 0:8d87bc453349 371 *
ninoderkinderen 0:8d87bc453349 372 * @return lwIP error code.
ninoderkinderen 0:8d87bc453349 373 * - ERR_OK. Successful. No error occured.
ninoderkinderen 0:8d87bc453349 374 * - ERR_MEM. Out of memory.
ninoderkinderen 0:8d87bc453349 375 * - ERR_RTE. Could not find route to destination address.
ninoderkinderen 0:8d87bc453349 376 * - More errors could be returned by lower protocol layers.
ninoderkinderen 0:8d87bc453349 377 *
ninoderkinderen 0:8d87bc453349 378 * @see udp_disconnect() udp_sendto()
ninoderkinderen 0:8d87bc453349 379 */
ninoderkinderen 0:8d87bc453349 380 err_t
ninoderkinderen 0:8d87bc453349 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
ninoderkinderen 0:8d87bc453349 382 {
ninoderkinderen 0:8d87bc453349 383 /* send to the packet using remote ip and port stored in the pcb */
ninoderkinderen 0:8d87bc453349 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
ninoderkinderen 0:8d87bc453349 385 }
ninoderkinderen 0:8d87bc453349 386
ninoderkinderen 0:8d87bc453349 387 #if LWIP_CHECKSUM_ON_COPY
ninoderkinderen 0:8d87bc453349 388 /** Same as udp_send() but with checksum
ninoderkinderen 0:8d87bc453349 389 */
ninoderkinderen 0:8d87bc453349 390 err_t
ninoderkinderen 0:8d87bc453349 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
ninoderkinderen 0:8d87bc453349 392 u8_t have_chksum, u16_t chksum)
ninoderkinderen 0:8d87bc453349 393 {
ninoderkinderen 0:8d87bc453349 394 /* send to the packet using remote ip and port stored in the pcb */
ninoderkinderen 0:8d87bc453349 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
ninoderkinderen 0:8d87bc453349 396 have_chksum, chksum);
ninoderkinderen 0:8d87bc453349 397 }
ninoderkinderen 0:8d87bc453349 398 #endif /* LWIP_CHECKSUM_ON_COPY */
ninoderkinderen 0:8d87bc453349 399
ninoderkinderen 0:8d87bc453349 400 /**
ninoderkinderen 0:8d87bc453349 401 * Send data to a specified address using UDP.
ninoderkinderen 0:8d87bc453349 402 *
ninoderkinderen 0:8d87bc453349 403 * @param pcb UDP PCB used to send the data.
ninoderkinderen 0:8d87bc453349 404 * @param p chain of pbuf's to be sent.
ninoderkinderen 0:8d87bc453349 405 * @param dst_ip Destination IP address.
ninoderkinderen 0:8d87bc453349 406 * @param dst_port Destination UDP port.
ninoderkinderen 0:8d87bc453349 407 *
ninoderkinderen 0:8d87bc453349 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
ninoderkinderen 0:8d87bc453349 409 *
ninoderkinderen 0:8d87bc453349 410 * If the PCB already has a remote address association, it will
ninoderkinderen 0:8d87bc453349 411 * be restored after the data is sent.
ninoderkinderen 0:8d87bc453349 412 *
ninoderkinderen 0:8d87bc453349 413 * @return lwIP error code (@see udp_send for possible error codes)
ninoderkinderen 0:8d87bc453349 414 *
ninoderkinderen 0:8d87bc453349 415 * @see udp_disconnect() udp_send()
ninoderkinderen 0:8d87bc453349 416 */
ninoderkinderen 0:8d87bc453349 417 err_t
ninoderkinderen 0:8d87bc453349 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
ninoderkinderen 0:8d87bc453349 419 ip_addr_t *dst_ip, u16_t dst_port)
ninoderkinderen 0:8d87bc453349 420 {
ninoderkinderen 0:8d87bc453349 421 #if LWIP_CHECKSUM_ON_COPY
ninoderkinderen 0:8d87bc453349 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
ninoderkinderen 0:8d87bc453349 423 }
ninoderkinderen 0:8d87bc453349 424
ninoderkinderen 0:8d87bc453349 425 /** Same as udp_sendto(), but with checksum */
ninoderkinderen 0:8d87bc453349 426 err_t
ninoderkinderen 0:8d87bc453349 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
ninoderkinderen 0:8d87bc453349 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
ninoderkinderen 0:8d87bc453349 429 {
ninoderkinderen 0:8d87bc453349 430 #endif /* LWIP_CHECKSUM_ON_COPY */
ninoderkinderen 0:8d87bc453349 431 struct netif *netif;
ninoderkinderen 0:8d87bc453349 432
ninoderkinderen 0:8d87bc453349 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
ninoderkinderen 0:8d87bc453349 434
ninoderkinderen 0:8d87bc453349 435 /* find the outgoing network interface for this packet */
ninoderkinderen 0:8d87bc453349 436 #if LWIP_IGMP
ninoderkinderen 0:8d87bc453349 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
ninoderkinderen 0:8d87bc453349 438 #else
ninoderkinderen 0:8d87bc453349 439 netif = ip_route(dst_ip);
ninoderkinderen 0:8d87bc453349 440 #endif /* LWIP_IGMP */
ninoderkinderen 0:8d87bc453349 441
ninoderkinderen 0:8d87bc453349 442 /* no outgoing network interface could be found? */
ninoderkinderen 0:8d87bc453349 443 if (netif == NULL) {
ninoderkinderen 0:8d87bc453349 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
ninoderkinderen 0:8d87bc453349 446 UDP_STATS_INC(udp.rterr);
ninoderkinderen 0:8d87bc453349 447 return ERR_RTE;
ninoderkinderen 0:8d87bc453349 448 }
ninoderkinderen 0:8d87bc453349 449 #if LWIP_CHECKSUM_ON_COPY
ninoderkinderen 0:8d87bc453349 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
ninoderkinderen 0:8d87bc453349 451 #else /* LWIP_CHECKSUM_ON_COPY */
ninoderkinderen 0:8d87bc453349 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
ninoderkinderen 0:8d87bc453349 453 #endif /* LWIP_CHECKSUM_ON_COPY */
ninoderkinderen 0:8d87bc453349 454 }
ninoderkinderen 0:8d87bc453349 455
ninoderkinderen 0:8d87bc453349 456 /**
ninoderkinderen 0:8d87bc453349 457 * Send data to a specified address using UDP.
ninoderkinderen 0:8d87bc453349 458 * The netif used for sending can be specified.
ninoderkinderen 0:8d87bc453349 459 *
ninoderkinderen 0:8d87bc453349 460 * This function exists mainly for DHCP, to be able to send UDP packets
ninoderkinderen 0:8d87bc453349 461 * on a netif that is still down.
ninoderkinderen 0:8d87bc453349 462 *
ninoderkinderen 0:8d87bc453349 463 * @param pcb UDP PCB used to send the data.
ninoderkinderen 0:8d87bc453349 464 * @param p chain of pbuf's to be sent.
ninoderkinderen 0:8d87bc453349 465 * @param dst_ip Destination IP address.
ninoderkinderen 0:8d87bc453349 466 * @param dst_port Destination UDP port.
ninoderkinderen 0:8d87bc453349 467 * @param netif the netif used for sending.
ninoderkinderen 0:8d87bc453349 468 *
ninoderkinderen 0:8d87bc453349 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
ninoderkinderen 0:8d87bc453349 470 *
ninoderkinderen 0:8d87bc453349 471 * @return lwIP error code (@see udp_send for possible error codes)
ninoderkinderen 0:8d87bc453349 472 *
ninoderkinderen 0:8d87bc453349 473 * @see udp_disconnect() udp_send()
ninoderkinderen 0:8d87bc453349 474 */
ninoderkinderen 0:8d87bc453349 475 err_t
ninoderkinderen 0:8d87bc453349 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
ninoderkinderen 0:8d87bc453349 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
ninoderkinderen 0:8d87bc453349 478 {
ninoderkinderen 0:8d87bc453349 479 #if LWIP_CHECKSUM_ON_COPY
ninoderkinderen 0:8d87bc453349 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
ninoderkinderen 0:8d87bc453349 481 }
ninoderkinderen 0:8d87bc453349 482
ninoderkinderen 0:8d87bc453349 483 /** Same as udp_sendto_if(), but with checksum */
ninoderkinderen 0:8d87bc453349 484 err_t
ninoderkinderen 0:8d87bc453349 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
ninoderkinderen 0:8d87bc453349 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
ninoderkinderen 0:8d87bc453349 487 u16_t chksum)
ninoderkinderen 0:8d87bc453349 488 {
ninoderkinderen 0:8d87bc453349 489 #endif /* LWIP_CHECKSUM_ON_COPY */
ninoderkinderen 0:8d87bc453349 490 struct udp_hdr *udphdr;
ninoderkinderen 0:8d87bc453349 491 ip_addr_t *src_ip;
ninoderkinderen 0:8d87bc453349 492 err_t err;
ninoderkinderen 0:8d87bc453349 493 struct pbuf *q; /* q will be sent down the stack */
ninoderkinderen 0:8d87bc453349 494
ninoderkinderen 0:8d87bc453349 495 #if IP_SOF_BROADCAST
ninoderkinderen 0:8d87bc453349 496 /* broadcast filter? */
ninoderkinderen 0:8d87bc453349 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
ninoderkinderen 0:8d87bc453349 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
ninoderkinderen 0:8d87bc453349 500 return ERR_VAL;
ninoderkinderen 0:8d87bc453349 501 }
ninoderkinderen 0:8d87bc453349 502 #endif /* IP_SOF_BROADCAST */
ninoderkinderen 0:8d87bc453349 503
ninoderkinderen 0:8d87bc453349 504 /* if the PCB is not yet bound to a port, bind it here */
ninoderkinderen 0:8d87bc453349 505 if (pcb->local_port == 0) {
ninoderkinderen 0:8d87bc453349 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
ninoderkinderen 0:8d87bc453349 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
ninoderkinderen 0:8d87bc453349 508 if (err != ERR_OK) {
ninoderkinderen 0:8d87bc453349 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
ninoderkinderen 0:8d87bc453349 510 return err;
ninoderkinderen 0:8d87bc453349 511 }
ninoderkinderen 0:8d87bc453349 512 }
ninoderkinderen 0:8d87bc453349 513
ninoderkinderen 0:8d87bc453349 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
ninoderkinderen 0:8d87bc453349 515 if (pbuf_header(p, UDP_HLEN)) {
ninoderkinderen 0:8d87bc453349 516 /* allocate header in a separate new pbuf */
ninoderkinderen 0:8d87bc453349 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
ninoderkinderen 0:8d87bc453349 518 /* new header pbuf could not be allocated? */
ninoderkinderen 0:8d87bc453349 519 if (q == NULL) {
ninoderkinderen 0:8d87bc453349 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
ninoderkinderen 0:8d87bc453349 521 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 522 }
ninoderkinderen 0:8d87bc453349 523 /* chain header q in front of given pbuf p */
ninoderkinderen 0:8d87bc453349 524 pbuf_chain(q, p);
ninoderkinderen 0:8d87bc453349 525 /* first pbuf q points to header pbuf */
ninoderkinderen 0:8d87bc453349 526 LWIP_DEBUGF(UDP_DEBUG,
ninoderkinderen 0:8d87bc453349 527 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
ninoderkinderen 0:8d87bc453349 528 } else {
ninoderkinderen 0:8d87bc453349 529 /* adding space for header within p succeeded */
ninoderkinderen 0:8d87bc453349 530 /* first pbuf q equals given pbuf */
ninoderkinderen 0:8d87bc453349 531 q = p;
ninoderkinderen 0:8d87bc453349 532 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
ninoderkinderen 0:8d87bc453349 533 }
ninoderkinderen 0:8d87bc453349 534 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
ninoderkinderen 0:8d87bc453349 535 (q->len >= sizeof(struct udp_hdr)));
ninoderkinderen 0:8d87bc453349 536 /* q now represents the packet to be sent */
ninoderkinderen 0:8d87bc453349 537 udphdr = (struct udp_hdr *)q->payload;
ninoderkinderen 0:8d87bc453349 538 udphdr->src = htons(pcb->local_port);
ninoderkinderen 0:8d87bc453349 539 udphdr->dest = htons(dst_port);
ninoderkinderen 0:8d87bc453349 540 /* in UDP, 0 checksum means 'no checksum' */
ninoderkinderen 0:8d87bc453349 541 udphdr->chksum = 0x0000;
ninoderkinderen 0:8d87bc453349 542
ninoderkinderen 0:8d87bc453349 543 /* Multicast Loop? */
ninoderkinderen 0:8d87bc453349 544 #if LWIP_IGMP
ninoderkinderen 0:8d87bc453349 545 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
ninoderkinderen 0:8d87bc453349 546 q->flags |= PBUF_FLAG_MCASTLOOP;
ninoderkinderen 0:8d87bc453349 547 }
ninoderkinderen 0:8d87bc453349 548 #endif /* LWIP_IGMP */
ninoderkinderen 0:8d87bc453349 549
ninoderkinderen 0:8d87bc453349 550
ninoderkinderen 0:8d87bc453349 551 /* PCB local address is IP_ANY_ADDR? */
ninoderkinderen 0:8d87bc453349 552 if (ip_addr_isany(&pcb->local_ip)) {
ninoderkinderen 0:8d87bc453349 553 /* use outgoing network interface IP address as source address */
ninoderkinderen 0:8d87bc453349 554 src_ip = &(netif->ip_addr);
ninoderkinderen 0:8d87bc453349 555 } else {
ninoderkinderen 0:8d87bc453349 556 /* check if UDP PCB local IP address is correct
ninoderkinderen 0:8d87bc453349 557 * this could be an old address if netif->ip_addr has changed */
ninoderkinderen 0:8d87bc453349 558 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
ninoderkinderen 0:8d87bc453349 559 /* local_ip doesn't match, drop the packet */
ninoderkinderen 0:8d87bc453349 560 if (q != p) {
ninoderkinderen 0:8d87bc453349 561 /* free the header pbuf */
ninoderkinderen 0:8d87bc453349 562 pbuf_free(q);
ninoderkinderen 0:8d87bc453349 563 q = NULL;
ninoderkinderen 0:8d87bc453349 564 /* p is still referenced by the caller, and will live on */
ninoderkinderen 0:8d87bc453349 565 }
ninoderkinderen 0:8d87bc453349 566 return ERR_VAL;
ninoderkinderen 0:8d87bc453349 567 }
ninoderkinderen 0:8d87bc453349 568 /* use UDP PCB local IP address as source address */
ninoderkinderen 0:8d87bc453349 569 src_ip = &(pcb->local_ip);
ninoderkinderen 0:8d87bc453349 570 }
ninoderkinderen 0:8d87bc453349 571
ninoderkinderen 0:8d87bc453349 572 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
ninoderkinderen 0:8d87bc453349 573
ninoderkinderen 0:8d87bc453349 574 #if LWIP_UDPLITE
ninoderkinderen 0:8d87bc453349 575 /* UDP Lite protocol? */
ninoderkinderen 0:8d87bc453349 576 if (pcb->flags & UDP_FLAGS_UDPLITE) {
ninoderkinderen 0:8d87bc453349 577 u16_t chklen, chklen_hdr;
ninoderkinderen 0:8d87bc453349 578 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
ninoderkinderen 0:8d87bc453349 579 /* set UDP message length in UDP header */
ninoderkinderen 0:8d87bc453349 580 chklen_hdr = chklen = pcb->chksum_len_tx;
ninoderkinderen 0:8d87bc453349 581 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
ninoderkinderen 0:8d87bc453349 582 if (chklen != 0) {
ninoderkinderen 0:8d87bc453349 583 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
ninoderkinderen 0:8d87bc453349 584 }
ninoderkinderen 0:8d87bc453349 585 /* For UDP-Lite, checksum length of 0 means checksum
ninoderkinderen 0:8d87bc453349 586 over the complete packet. (See RFC 3828 chap. 3.1)
ninoderkinderen 0:8d87bc453349 587 At least the UDP-Lite header must be covered by the
ninoderkinderen 0:8d87bc453349 588 checksum, therefore, if chksum_len has an illegal
ninoderkinderen 0:8d87bc453349 589 value, we generate the checksum over the complete
ninoderkinderen 0:8d87bc453349 590 packet to be safe. */
ninoderkinderen 0:8d87bc453349 591 chklen_hdr = 0;
ninoderkinderen 0:8d87bc453349 592 chklen = q->tot_len;
ninoderkinderen 0:8d87bc453349 593 }
ninoderkinderen 0:8d87bc453349 594 udphdr->len = htons(chklen_hdr);
ninoderkinderen 0:8d87bc453349 595 /* calculate checksum */
ninoderkinderen 0:8d87bc453349 596 #if CHECKSUM_GEN_UDP
ninoderkinderen 0:8d87bc453349 597 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
ninoderkinderen 0:8d87bc453349 598 IP_PROTO_UDPLITE, q->tot_len,
ninoderkinderen 0:8d87bc453349 599 #if !LWIP_CHECKSUM_ON_COPY
ninoderkinderen 0:8d87bc453349 600 chklen);
ninoderkinderen 0:8d87bc453349 601 #else /* !LWIP_CHECKSUM_ON_COPY */
ninoderkinderen 0:8d87bc453349 602 (have_chksum ? UDP_HLEN : chklen));
ninoderkinderen 0:8d87bc453349 603 if (have_chksum) {
ninoderkinderen 0:8d87bc453349 604 u32_t acc;
ninoderkinderen 0:8d87bc453349 605 acc = udphdr->chksum + (u16_t)~(chksum);
ninoderkinderen 0:8d87bc453349 606 udphdr->chksum = FOLD_U32T(acc);
ninoderkinderen 0:8d87bc453349 607 }
ninoderkinderen 0:8d87bc453349 608 #endif /* !LWIP_CHECKSUM_ON_COPY */
ninoderkinderen 0:8d87bc453349 609
ninoderkinderen 0:8d87bc453349 610 /* chksum zero must become 0xffff, as zero means 'no checksum' */
ninoderkinderen 0:8d87bc453349 611 if (udphdr->chksum == 0x0000) {
ninoderkinderen 0:8d87bc453349 612 udphdr->chksum = 0xffff;
ninoderkinderen 0:8d87bc453349 613 }
ninoderkinderen 0:8d87bc453349 614 #endif /* CHECKSUM_GEN_UDP */
ninoderkinderen 0:8d87bc453349 615 /* output to IP */
ninoderkinderen 0:8d87bc453349 616 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
ninoderkinderen 0:8d87bc453349 617 #if LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 618 netif->addr_hint = &(pcb->addr_hint);
ninoderkinderen 0:8d87bc453349 619 #endif /* LWIP_NETIF_HWADDRHINT*/
ninoderkinderen 0:8d87bc453349 620 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
ninoderkinderen 0:8d87bc453349 621 #if LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 622 netif->addr_hint = NULL;
ninoderkinderen 0:8d87bc453349 623 #endif /* LWIP_NETIF_HWADDRHINT*/
ninoderkinderen 0:8d87bc453349 624 } else
ninoderkinderen 0:8d87bc453349 625 #endif /* LWIP_UDPLITE */
ninoderkinderen 0:8d87bc453349 626 { /* UDP */
ninoderkinderen 0:8d87bc453349 627 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
ninoderkinderen 0:8d87bc453349 628 udphdr->len = htons(q->tot_len);
ninoderkinderen 0:8d87bc453349 629 /* calculate checksum */
ninoderkinderen 0:8d87bc453349 630 #if CHECKSUM_GEN_UDP
ninoderkinderen 0:8d87bc453349 631 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
ninoderkinderen 0:8d87bc453349 632 u16_t udpchksum;
ninoderkinderen 0:8d87bc453349 633 #if LWIP_CHECKSUM_ON_COPY
ninoderkinderen 0:8d87bc453349 634 if (have_chksum) {
ninoderkinderen 0:8d87bc453349 635 u32_t acc;
ninoderkinderen 0:8d87bc453349 636 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
ninoderkinderen 0:8d87bc453349 637 q->tot_len, UDP_HLEN);
ninoderkinderen 0:8d87bc453349 638 acc = udpchksum + (u16_t)~(chksum);
ninoderkinderen 0:8d87bc453349 639 udpchksum = FOLD_U32T(acc);
ninoderkinderen 0:8d87bc453349 640 } else
ninoderkinderen 0:8d87bc453349 641 #endif /* LWIP_CHECKSUM_ON_COPY */
ninoderkinderen 0:8d87bc453349 642 {
ninoderkinderen 0:8d87bc453349 643 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
ninoderkinderen 0:8d87bc453349 644 }
ninoderkinderen 0:8d87bc453349 645
ninoderkinderen 0:8d87bc453349 646 /* chksum zero must become 0xffff, as zero means 'no checksum' */
ninoderkinderen 0:8d87bc453349 647 if (udpchksum == 0x0000) {
ninoderkinderen 0:8d87bc453349 648 udpchksum = 0xffff;
ninoderkinderen 0:8d87bc453349 649 }
ninoderkinderen 0:8d87bc453349 650 udphdr->chksum = udpchksum;
ninoderkinderen 0:8d87bc453349 651 }
ninoderkinderen 0:8d87bc453349 652 #endif /* CHECKSUM_GEN_UDP */
ninoderkinderen 0:8d87bc453349 653 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
ninoderkinderen 0:8d87bc453349 654 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
ninoderkinderen 0:8d87bc453349 655 /* output to IP */
ninoderkinderen 0:8d87bc453349 656 #if LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 657 netif->addr_hint = &(pcb->addr_hint);
ninoderkinderen 0:8d87bc453349 658 #endif /* LWIP_NETIF_HWADDRHINT*/
ninoderkinderen 0:8d87bc453349 659 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
ninoderkinderen 0:8d87bc453349 660 #if LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 661 netif->addr_hint = NULL;
ninoderkinderen 0:8d87bc453349 662 #endif /* LWIP_NETIF_HWADDRHINT*/
ninoderkinderen 0:8d87bc453349 663 }
ninoderkinderen 0:8d87bc453349 664 /* TODO: must this be increased even if error occured? */
ninoderkinderen 0:8d87bc453349 665 snmp_inc_udpoutdatagrams();
ninoderkinderen 0:8d87bc453349 666
ninoderkinderen 0:8d87bc453349 667 /* did we chain a separate header pbuf earlier? */
ninoderkinderen 0:8d87bc453349 668 if (q != p) {
ninoderkinderen 0:8d87bc453349 669 /* free the header pbuf */
ninoderkinderen 0:8d87bc453349 670 pbuf_free(q);
ninoderkinderen 0:8d87bc453349 671 q = NULL;
ninoderkinderen 0:8d87bc453349 672 /* p is still referenced by the caller, and will live on */
ninoderkinderen 0:8d87bc453349 673 }
ninoderkinderen 0:8d87bc453349 674
ninoderkinderen 0:8d87bc453349 675 UDP_STATS_INC(udp.xmit);
ninoderkinderen 0:8d87bc453349 676 return err;
ninoderkinderen 0:8d87bc453349 677 }
ninoderkinderen 0:8d87bc453349 678
ninoderkinderen 0:8d87bc453349 679 /**
ninoderkinderen 0:8d87bc453349 680 * Bind an UDP PCB.
ninoderkinderen 0:8d87bc453349 681 *
ninoderkinderen 0:8d87bc453349 682 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
ninoderkinderen 0:8d87bc453349 683 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
ninoderkinderen 0:8d87bc453349 684 * bind to all local interfaces.
ninoderkinderen 0:8d87bc453349 685 * @param port local UDP port to bind with. Use 0 to automatically bind
ninoderkinderen 0:8d87bc453349 686 * to a random port between UDP_LOCAL_PORT_RANGE_START and
ninoderkinderen 0:8d87bc453349 687 * UDP_LOCAL_PORT_RANGE_END.
ninoderkinderen 0:8d87bc453349 688 *
ninoderkinderen 0:8d87bc453349 689 * ipaddr & port are expected to be in the same byte order as in the pcb.
ninoderkinderen 0:8d87bc453349 690 *
ninoderkinderen 0:8d87bc453349 691 * @return lwIP error code.
ninoderkinderen 0:8d87bc453349 692 * - ERR_OK. Successful. No error occured.
ninoderkinderen 0:8d87bc453349 693 * - ERR_USE. The specified ipaddr and port are already bound to by
ninoderkinderen 0:8d87bc453349 694 * another UDP PCB.
ninoderkinderen 0:8d87bc453349 695 *
ninoderkinderen 0:8d87bc453349 696 * @see udp_disconnect()
ninoderkinderen 0:8d87bc453349 697 */
ninoderkinderen 0:8d87bc453349 698 err_t
ninoderkinderen 0:8d87bc453349 699 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
ninoderkinderen 0:8d87bc453349 700 {
ninoderkinderen 0:8d87bc453349 701 struct udp_pcb *ipcb;
ninoderkinderen 0:8d87bc453349 702 u8_t rebind;
ninoderkinderen 0:8d87bc453349 703
ninoderkinderen 0:8d87bc453349 704 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
ninoderkinderen 0:8d87bc453349 705 ip_addr_debug_print(UDP_DEBUG, ipaddr);
ninoderkinderen 0:8d87bc453349 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
ninoderkinderen 0:8d87bc453349 707
ninoderkinderen 0:8d87bc453349 708 rebind = 0;
ninoderkinderen 0:8d87bc453349 709 /* Check for double bind and rebind of the same pcb */
ninoderkinderen 0:8d87bc453349 710 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
ninoderkinderen 0:8d87bc453349 711 /* is this UDP PCB already on active list? */
ninoderkinderen 0:8d87bc453349 712 if (pcb == ipcb) {
ninoderkinderen 0:8d87bc453349 713 /* pcb may occur at most once in active list */
ninoderkinderen 0:8d87bc453349 714 LWIP_ASSERT("rebind == 0", rebind == 0);
ninoderkinderen 0:8d87bc453349 715 /* pcb already in list, just rebind */
ninoderkinderen 0:8d87bc453349 716 rebind = 1;
ninoderkinderen 0:8d87bc453349 717 }
ninoderkinderen 0:8d87bc453349 718
ninoderkinderen 0:8d87bc453349 719 /* By default, we don't allow to bind to a port that any other udp
ninoderkinderen 0:8d87bc453349 720 PCB is alread bound to, unless *all* PCBs with that port have tha
ninoderkinderen 0:8d87bc453349 721 REUSEADDR flag set. */
ninoderkinderen 0:8d87bc453349 722 #if SO_REUSE
ninoderkinderen 0:8d87bc453349 723 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
ninoderkinderen 0:8d87bc453349 724 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
ninoderkinderen 0:8d87bc453349 725 #else /* SO_REUSE */
ninoderkinderen 0:8d87bc453349 726 /* port matches that of PCB in list and REUSEADDR not set -> reject */
ninoderkinderen 0:8d87bc453349 727 else {
ninoderkinderen 0:8d87bc453349 728 #endif /* SO_REUSE */
ninoderkinderen 0:8d87bc453349 729 if ((ipcb->local_port == port) &&
ninoderkinderen 0:8d87bc453349 730 /* IP address matches, or one is IP_ADDR_ANY? */
ninoderkinderen 0:8d87bc453349 731 (ip_addr_isany(&(ipcb->local_ip)) ||
ninoderkinderen 0:8d87bc453349 732 ip_addr_isany(ipaddr) ||
ninoderkinderen 0:8d87bc453349 733 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
ninoderkinderen 0:8d87bc453349 734 /* other PCB already binds to this local IP and port */
ninoderkinderen 0:8d87bc453349 735 LWIP_DEBUGF(UDP_DEBUG,
ninoderkinderen 0:8d87bc453349 736 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
ninoderkinderen 0:8d87bc453349 737 return ERR_USE;
ninoderkinderen 0:8d87bc453349 738 }
ninoderkinderen 0:8d87bc453349 739 }
ninoderkinderen 0:8d87bc453349 740 }
ninoderkinderen 0:8d87bc453349 741
ninoderkinderen 0:8d87bc453349 742 ip_addr_set(&pcb->local_ip, ipaddr);
ninoderkinderen 0:8d87bc453349 743
ninoderkinderen 0:8d87bc453349 744 /* no port specified? */
ninoderkinderen 0:8d87bc453349 745 if (port == 0) {
ninoderkinderen 0:8d87bc453349 746 #ifndef UDP_LOCAL_PORT_RANGE_START
ninoderkinderen 0:8d87bc453349 747 #define UDP_LOCAL_PORT_RANGE_START 4096
ninoderkinderen 0:8d87bc453349 748 #define UDP_LOCAL_PORT_RANGE_END 0x7fff
ninoderkinderen 0:8d87bc453349 749 #endif
ninoderkinderen 0:8d87bc453349 750 port = UDP_LOCAL_PORT_RANGE_START;
ninoderkinderen 0:8d87bc453349 751 ipcb = udp_pcbs;
ninoderkinderen 0:8d87bc453349 752 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
ninoderkinderen 0:8d87bc453349 753 if (ipcb->local_port == port) {
ninoderkinderen 0:8d87bc453349 754 /* port is already used by another udp_pcb */
ninoderkinderen 0:8d87bc453349 755 port++;
ninoderkinderen 0:8d87bc453349 756 /* restart scanning all udp pcbs */
ninoderkinderen 0:8d87bc453349 757 ipcb = udp_pcbs;
ninoderkinderen 0:8d87bc453349 758 } else {
ninoderkinderen 0:8d87bc453349 759 /* go on with next udp pcb */
ninoderkinderen 0:8d87bc453349 760 ipcb = ipcb->next;
ninoderkinderen 0:8d87bc453349 761 }
ninoderkinderen 0:8d87bc453349 762 }
ninoderkinderen 0:8d87bc453349 763 if (ipcb != NULL) {
ninoderkinderen 0:8d87bc453349 764 /* no more ports available in local range */
ninoderkinderen 0:8d87bc453349 765 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
ninoderkinderen 0:8d87bc453349 766 return ERR_USE;
ninoderkinderen 0:8d87bc453349 767 }
ninoderkinderen 0:8d87bc453349 768 }
ninoderkinderen 0:8d87bc453349 769 pcb->local_port = port;
ninoderkinderen 0:8d87bc453349 770 snmp_insert_udpidx_tree(pcb);
ninoderkinderen 0:8d87bc453349 771 /* pcb not active yet? */
ninoderkinderen 0:8d87bc453349 772 if (rebind == 0) {
ninoderkinderen 0:8d87bc453349 773 /* place the PCB on the active list if not already there */
ninoderkinderen 0:8d87bc453349 774 pcb->next = udp_pcbs;
ninoderkinderen 0:8d87bc453349 775 udp_pcbs = pcb;
ninoderkinderen 0:8d87bc453349 776 }
ninoderkinderen 0:8d87bc453349 777 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
ninoderkinderen 0:8d87bc453349 778 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
ninoderkinderen 0:8d87bc453349 779 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
ninoderkinderen 0:8d87bc453349 780 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
ninoderkinderen 0:8d87bc453349 781 pcb->local_port));
ninoderkinderen 0:8d87bc453349 782 return ERR_OK;
ninoderkinderen 0:8d87bc453349 783 }
ninoderkinderen 0:8d87bc453349 784 /**
ninoderkinderen 0:8d87bc453349 785 * Connect an UDP PCB.
ninoderkinderen 0:8d87bc453349 786 *
ninoderkinderen 0:8d87bc453349 787 * This will associate the UDP PCB with the remote address.
ninoderkinderen 0:8d87bc453349 788 *
ninoderkinderen 0:8d87bc453349 789 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
ninoderkinderen 0:8d87bc453349 790 * @param ipaddr remote IP address to connect with.
ninoderkinderen 0:8d87bc453349 791 * @param port remote UDP port to connect with.
ninoderkinderen 0:8d87bc453349 792 *
ninoderkinderen 0:8d87bc453349 793 * @return lwIP error code
ninoderkinderen 0:8d87bc453349 794 *
ninoderkinderen 0:8d87bc453349 795 * ipaddr & port are expected to be in the same byte order as in the pcb.
ninoderkinderen 0:8d87bc453349 796 *
ninoderkinderen 0:8d87bc453349 797 * The udp pcb is bound to a random local port if not already bound.
ninoderkinderen 0:8d87bc453349 798 *
ninoderkinderen 0:8d87bc453349 799 * @see udp_disconnect()
ninoderkinderen 0:8d87bc453349 800 */
ninoderkinderen 0:8d87bc453349 801 err_t
ninoderkinderen 0:8d87bc453349 802 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
ninoderkinderen 0:8d87bc453349 803 {
ninoderkinderen 0:8d87bc453349 804 struct udp_pcb *ipcb;
ninoderkinderen 0:8d87bc453349 805
ninoderkinderen 0:8d87bc453349 806 if (pcb->local_port == 0) {
ninoderkinderen 0:8d87bc453349 807 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
ninoderkinderen 0:8d87bc453349 808 if (err != ERR_OK) {
ninoderkinderen 0:8d87bc453349 809 return err;
ninoderkinderen 0:8d87bc453349 810 }
ninoderkinderen 0:8d87bc453349 811 }
ninoderkinderen 0:8d87bc453349 812
ninoderkinderen 0:8d87bc453349 813 ip_addr_set(&pcb->remote_ip, ipaddr);
ninoderkinderen 0:8d87bc453349 814 pcb->remote_port = port;
ninoderkinderen 0:8d87bc453349 815 pcb->flags |= UDP_FLAGS_CONNECTED;
ninoderkinderen 0:8d87bc453349 816 /** TODO: this functionality belongs in upper layers */
ninoderkinderen 0:8d87bc453349 817 #ifdef LWIP_UDP_TODO
ninoderkinderen 0:8d87bc453349 818 /* Nail down local IP for netconn_addr()/getsockname() */
ninoderkinderen 0:8d87bc453349 819 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
ninoderkinderen 0:8d87bc453349 820 struct netif *netif;
ninoderkinderen 0:8d87bc453349 821
ninoderkinderen 0:8d87bc453349 822 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
ninoderkinderen 0:8d87bc453349 823 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
ninoderkinderen 0:8d87bc453349 824 UDP_STATS_INC(udp.rterr);
ninoderkinderen 0:8d87bc453349 825 return ERR_RTE;
ninoderkinderen 0:8d87bc453349 826 }
ninoderkinderen 0:8d87bc453349 827 /** TODO: this will bind the udp pcb locally, to the interface which
ninoderkinderen 0:8d87bc453349 828 is used to route output packets to the remote address. However, we
ninoderkinderen 0:8d87bc453349 829 might want to accept incoming packets on any interface! */
ninoderkinderen 0:8d87bc453349 830 pcb->local_ip = netif->ip_addr;
ninoderkinderen 0:8d87bc453349 831 } else if (ip_addr_isany(&pcb->remote_ip)) {
ninoderkinderen 0:8d87bc453349 832 pcb->local_ip.addr = 0;
ninoderkinderen 0:8d87bc453349 833 }
ninoderkinderen 0:8d87bc453349 834 #endif
ninoderkinderen 0:8d87bc453349 835 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
ninoderkinderen 0:8d87bc453349 836 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
ninoderkinderen 0:8d87bc453349 837 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
ninoderkinderen 0:8d87bc453349 838 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
ninoderkinderen 0:8d87bc453349 839 pcb->local_port));
ninoderkinderen 0:8d87bc453349 840
ninoderkinderen 0:8d87bc453349 841 /* Insert UDP PCB into the list of active UDP PCBs. */
ninoderkinderen 0:8d87bc453349 842 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
ninoderkinderen 0:8d87bc453349 843 if (pcb == ipcb) {
ninoderkinderen 0:8d87bc453349 844 /* already on the list, just return */
ninoderkinderen 0:8d87bc453349 845 return ERR_OK;
ninoderkinderen 0:8d87bc453349 846 }
ninoderkinderen 0:8d87bc453349 847 }
ninoderkinderen 0:8d87bc453349 848 /* PCB not yet on the list, add PCB now */
ninoderkinderen 0:8d87bc453349 849 pcb->next = udp_pcbs;
ninoderkinderen 0:8d87bc453349 850 udp_pcbs = pcb;
ninoderkinderen 0:8d87bc453349 851 return ERR_OK;
ninoderkinderen 0:8d87bc453349 852 }
ninoderkinderen 0:8d87bc453349 853
ninoderkinderen 0:8d87bc453349 854 /**
ninoderkinderen 0:8d87bc453349 855 * Disconnect a UDP PCB
ninoderkinderen 0:8d87bc453349 856 *
ninoderkinderen 0:8d87bc453349 857 * @param pcb the udp pcb to disconnect.
ninoderkinderen 0:8d87bc453349 858 */
ninoderkinderen 0:8d87bc453349 859 void
ninoderkinderen 0:8d87bc453349 860 udp_disconnect(struct udp_pcb *pcb)
ninoderkinderen 0:8d87bc453349 861 {
ninoderkinderen 0:8d87bc453349 862 /* reset remote address association */
ninoderkinderen 0:8d87bc453349 863 ip_addr_set_any(&pcb->remote_ip);
ninoderkinderen 0:8d87bc453349 864 pcb->remote_port = 0;
ninoderkinderen 0:8d87bc453349 865 /* mark PCB as unconnected */
ninoderkinderen 0:8d87bc453349 866 pcb->flags &= ~UDP_FLAGS_CONNECTED;
ninoderkinderen 0:8d87bc453349 867 }
ninoderkinderen 0:8d87bc453349 868
ninoderkinderen 0:8d87bc453349 869 /**
ninoderkinderen 0:8d87bc453349 870 * Set a receive callback for a UDP PCB
ninoderkinderen 0:8d87bc453349 871 *
ninoderkinderen 0:8d87bc453349 872 * This callback will be called when receiving a datagram for the pcb.
ninoderkinderen 0:8d87bc453349 873 *
ninoderkinderen 0:8d87bc453349 874 * @param pcb the pcb for wich to set the recv callback
ninoderkinderen 0:8d87bc453349 875 * @param recv function pointer of the callback function
ninoderkinderen 0:8d87bc453349 876 * @param recv_arg additional argument to pass to the callback function
ninoderkinderen 0:8d87bc453349 877 */
ninoderkinderen 0:8d87bc453349 878 void
ninoderkinderen 0:8d87bc453349 879 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
ninoderkinderen 0:8d87bc453349 880 {
ninoderkinderen 0:8d87bc453349 881 /* remember recv() callback and user data */
ninoderkinderen 0:8d87bc453349 882 pcb->recv = recv;
ninoderkinderen 0:8d87bc453349 883 pcb->recv_arg = recv_arg;
ninoderkinderen 0:8d87bc453349 884 }
ninoderkinderen 0:8d87bc453349 885
ninoderkinderen 0:8d87bc453349 886 /**
ninoderkinderen 0:8d87bc453349 887 * Remove an UDP PCB.
ninoderkinderen 0:8d87bc453349 888 *
ninoderkinderen 0:8d87bc453349 889 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
ninoderkinderen 0:8d87bc453349 890 * UDP PCB's and the data structure is freed from memory.
ninoderkinderen 0:8d87bc453349 891 *
ninoderkinderen 0:8d87bc453349 892 * @see udp_new()
ninoderkinderen 0:8d87bc453349 893 */
ninoderkinderen 0:8d87bc453349 894 void
ninoderkinderen 0:8d87bc453349 895 udp_remove(struct udp_pcb *pcb)
ninoderkinderen 0:8d87bc453349 896 {
ninoderkinderen 0:8d87bc453349 897 struct udp_pcb *pcb2;
ninoderkinderen 0:8d87bc453349 898
ninoderkinderen 0:8d87bc453349 899 snmp_delete_udpidx_tree(pcb);
ninoderkinderen 0:8d87bc453349 900 /* pcb to be removed is first in list? */
ninoderkinderen 0:8d87bc453349 901 if (udp_pcbs == pcb) {
ninoderkinderen 0:8d87bc453349 902 /* make list start at 2nd pcb */
ninoderkinderen 0:8d87bc453349 903 udp_pcbs = udp_pcbs->next;
ninoderkinderen 0:8d87bc453349 904 /* pcb not 1st in list */
ninoderkinderen 0:8d87bc453349 905 } else {
ninoderkinderen 0:8d87bc453349 906 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
ninoderkinderen 0:8d87bc453349 907 /* find pcb in udp_pcbs list */
ninoderkinderen 0:8d87bc453349 908 if (pcb2->next != NULL && pcb2->next == pcb) {
ninoderkinderen 0:8d87bc453349 909 /* remove pcb from list */
ninoderkinderen 0:8d87bc453349 910 pcb2->next = pcb->next;
ninoderkinderen 0:8d87bc453349 911 }
ninoderkinderen 0:8d87bc453349 912 }
ninoderkinderen 0:8d87bc453349 913 }
ninoderkinderen 0:8d87bc453349 914 memp_free(MEMP_UDP_PCB, pcb);
ninoderkinderen 0:8d87bc453349 915 }
ninoderkinderen 0:8d87bc453349 916
ninoderkinderen 0:8d87bc453349 917 /**
ninoderkinderen 0:8d87bc453349 918 * Create a UDP PCB.
ninoderkinderen 0:8d87bc453349 919 *
ninoderkinderen 0:8d87bc453349 920 * @return The UDP PCB which was created. NULL if the PCB data structure
ninoderkinderen 0:8d87bc453349 921 * could not be allocated.
ninoderkinderen 0:8d87bc453349 922 *
ninoderkinderen 0:8d87bc453349 923 * @see udp_remove()
ninoderkinderen 0:8d87bc453349 924 */
ninoderkinderen 0:8d87bc453349 925 struct udp_pcb *
ninoderkinderen 0:8d87bc453349 926 udp_new(void)
ninoderkinderen 0:8d87bc453349 927 {
ninoderkinderen 0:8d87bc453349 928 struct udp_pcb *pcb;
ninoderkinderen 0:8d87bc453349 929 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
ninoderkinderen 0:8d87bc453349 930 /* could allocate UDP PCB? */
ninoderkinderen 0:8d87bc453349 931 if (pcb != NULL) {
ninoderkinderen 0:8d87bc453349 932 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
ninoderkinderen 0:8d87bc453349 933 * which means checksum is generated over the whole datagram per default
ninoderkinderen 0:8d87bc453349 934 * (recommended as default by RFC 3828). */
ninoderkinderen 0:8d87bc453349 935 /* initialize PCB to all zeroes */
ninoderkinderen 0:8d87bc453349 936 memset(pcb, 0, sizeof(struct udp_pcb));
ninoderkinderen 0:8d87bc453349 937 pcb->ttl = UDP_TTL;
ninoderkinderen 0:8d87bc453349 938 }
ninoderkinderen 0:8d87bc453349 939 return pcb;
ninoderkinderen 0:8d87bc453349 940 }
ninoderkinderen 0:8d87bc453349 941
ninoderkinderen 0:8d87bc453349 942 #if UDP_DEBUG
ninoderkinderen 0:8d87bc453349 943 /**
ninoderkinderen 0:8d87bc453349 944 * Print UDP header information for debug purposes.
ninoderkinderen 0:8d87bc453349 945 *
ninoderkinderen 0:8d87bc453349 946 * @param udphdr pointer to the udp header in memory.
ninoderkinderen 0:8d87bc453349 947 */
ninoderkinderen 0:8d87bc453349 948 void
ninoderkinderen 0:8d87bc453349 949 udp_debug_print(struct udp_hdr *udphdr)
ninoderkinderen 0:8d87bc453349 950 {
ninoderkinderen 0:8d87bc453349 951 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
ninoderkinderen 0:8d87bc453349 952 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 953 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
ninoderkinderen 0:8d87bc453349 954 ntohs(udphdr->src), ntohs(udphdr->dest)));
ninoderkinderen 0:8d87bc453349 955 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 956 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
ninoderkinderen 0:8d87bc453349 957 ntohs(udphdr->len), ntohs(udphdr->chksum)));
ninoderkinderen 0:8d87bc453349 958 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 959 }
ninoderkinderen 0:8d87bc453349 960 #endif /* UDP_DEBUG */
ninoderkinderen 0:8d87bc453349 961
ninoderkinderen 0:8d87bc453349 962 #endif /* LWIP_UDP */