Lorcan Smith / Mbed 2 deprecated Enet_SPI

SNMP agent attached to SPI slave

Dependencies:   mbed

lwip/core/udp.c@0:2a53a4c3238c, 2012-08-13 (annotated)

Committer:
lorcansmith
Date:
Mon Aug 13 15:07:40 2012 +0000
Revision:
0:2a53a4c3238c
v1.1 release includes ioAlarm traps

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lorcansmith 0:2a53a4c3238c 1 /**
lorcansmith 0:2a53a4c3238c 2 * @file
lorcansmith 0:2a53a4c3238c 3 * User Datagram Protocol module
lorcansmith 0:2a53a4c3238c 4 v0.1: Debug statements in udp_connect
lorcansmith 0:2a53a4c3238c 5 *
lorcansmith 0:2a53a4c3238c 6 */
lorcansmith 0:2a53a4c3238c 7
lorcansmith 0:2a53a4c3238c 8 /*
lorcansmith 0:2a53a4c3238c 9 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
lorcansmith 0:2a53a4c3238c 10 * All rights reserved.
lorcansmith 0:2a53a4c3238c 11 *
lorcansmith 0:2a53a4c3238c 12 * Redistribution and use in source and binary forms, with or without modification,
lorcansmith 0:2a53a4c3238c 13 * are permitted provided that the following conditions are met:
lorcansmith 0:2a53a4c3238c 14 *
lorcansmith 0:2a53a4c3238c 15 * 1. Redistributions of source code must retain the above copyright notice,
lorcansmith 0:2a53a4c3238c 16 * this list of conditions and the following disclaimer.
lorcansmith 0:2a53a4c3238c 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
lorcansmith 0:2a53a4c3238c 18 * this list of conditions and the following disclaimer in the documentation
lorcansmith 0:2a53a4c3238c 19 * and/or other materials provided with the distribution.
lorcansmith 0:2a53a4c3238c 20 * 3. The name of the author may not be used to endorse or promote products
lorcansmith 0:2a53a4c3238c 21 * derived from this software without specific prior written permission.
lorcansmith 0:2a53a4c3238c 22 *
lorcansmith 0:2a53a4c3238c 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
lorcansmith 0:2a53a4c3238c 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
lorcansmith 0:2a53a4c3238c 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
lorcansmith 0:2a53a4c3238c 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
lorcansmith 0:2a53a4c3238c 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
lorcansmith 0:2a53a4c3238c 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
lorcansmith 0:2a53a4c3238c 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
lorcansmith 0:2a53a4c3238c 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
lorcansmith 0:2a53a4c3238c 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
lorcansmith 0:2a53a4c3238c 32 * OF SUCH DAMAGE.
lorcansmith 0:2a53a4c3238c 33 *
lorcansmith 0:2a53a4c3238c 34 * This file is part of the lwIP TCP/IP stack.
lorcansmith 0:2a53a4c3238c 35 *
lorcansmith 0:2a53a4c3238c 36 * Author: Adam Dunkels <adam@sics.se>
lorcansmith 0:2a53a4c3238c 37 *
lorcansmith 0:2a53a4c3238c 38 */
lorcansmith 0:2a53a4c3238c 39
lorcansmith 0:2a53a4c3238c 40
lorcansmith 0:2a53a4c3238c 41 /* udp.c
lorcansmith 0:2a53a4c3238c 42 *
lorcansmith 0:2a53a4c3238c 43 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
lorcansmith 0:2a53a4c3238c 44 *
lorcansmith 0:2a53a4c3238c 45 */
lorcansmith 0:2a53a4c3238c 46
lorcansmith 0:2a53a4c3238c 47 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
lorcansmith 0:2a53a4c3238c 48 */
lorcansmith 0:2a53a4c3238c 49
lorcansmith 0:2a53a4c3238c 50 #include "lwip/opt.h"
lorcansmith 0:2a53a4c3238c 51
lorcansmith 0:2a53a4c3238c 52 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
lorcansmith 0:2a53a4c3238c 53
lorcansmith 0:2a53a4c3238c 54 #include "lwip/udp.h"
lorcansmith 0:2a53a4c3238c 55 #include "lwip/def.h"
lorcansmith 0:2a53a4c3238c 56 #include "lwip/memp.h"
lorcansmith 0:2a53a4c3238c 57 #include "lwip/inet_chksum.h"
lorcansmith 0:2a53a4c3238c 58 #include "lwip/ip_addr.h"
lorcansmith 0:2a53a4c3238c 59 #include "lwip/netif.h"
lorcansmith 0:2a53a4c3238c 60 #include "lwip/icmp.h"
lorcansmith 0:2a53a4c3238c 61 #include "lwip/stats.h"
lorcansmith 0:2a53a4c3238c 62 #include "lwip/snmp.h"
lorcansmith 0:2a53a4c3238c 63 #include "arch/perf.h"
lorcansmith 0:2a53a4c3238c 64 #include "lwip/dhcp.h"
lorcansmith 0:2a53a4c3238c 65
lorcansmith 0:2a53a4c3238c 66 #include <string.h>
lorcansmith 0:2a53a4c3238c 67 #include <stdio.h>
lorcansmith 0:2a53a4c3238c 68
lorcansmith 0:2a53a4c3238c 69 /**
lorcansmith 0:2a53a4c3238c 70 * UDP_DEBUG: Enable debugging in UDP.
lorcansmith 0:2a53a4c3238c 71 */
lorcansmith 0:2a53a4c3238c 72 #ifndef UDP_DEBUG
lorcansmith 0:2a53a4c3238c 73 #define UDP_DEBUG LWIP_DBG_ON
lorcansmith 0:2a53a4c3238c 74 #endif
lorcansmith 0:2a53a4c3238c 75
lorcansmith 0:2a53a4c3238c 76 /* The list of UDP PCBs */
lorcansmith 0:2a53a4c3238c 77 /* exported in udp.h (was static) */
lorcansmith 0:2a53a4c3238c 78 struct udp_pcb *udp_pcbs;
lorcansmith 0:2a53a4c3238c 79
lorcansmith 0:2a53a4c3238c 80 /**
lorcansmith 0:2a53a4c3238c 81 * Process an incoming UDP datagram.
lorcansmith 0:2a53a4c3238c 82 *
lorcansmith 0:2a53a4c3238c 83 * Given an incoming UDP datagram (as a chain of pbufs) this function
lorcansmith 0:2a53a4c3238c 84 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
lorcansmith 0:2a53a4c3238c 85 * recv function. If no pcb is found or the datagram is incorrect, the
lorcansmith 0:2a53a4c3238c 86 * pbuf is freed.
lorcansmith 0:2a53a4c3238c 87 *
lorcansmith 0:2a53a4c3238c 88 * @param p pbuf to be demultiplexed to a UDP PCB.
lorcansmith 0:2a53a4c3238c 89 * @param inp network interface on which the datagram was received.
lorcansmith 0:2a53a4c3238c 90 *
lorcansmith 0:2a53a4c3238c 91 */
lorcansmith 0:2a53a4c3238c 92 void
lorcansmith 0:2a53a4c3238c 93 udp_input(struct pbuf *p, struct netif *inp)
lorcansmith 0:2a53a4c3238c 94 {
lorcansmith 0:2a53a4c3238c 95 struct udp_hdr *udphdr;
lorcansmith 0:2a53a4c3238c 96 struct udp_pcb *pcb, *prev;
lorcansmith 0:2a53a4c3238c 97 struct udp_pcb *uncon_pcb;
lorcansmith 0:2a53a4c3238c 98 struct ip_hdr *iphdr;
lorcansmith 0:2a53a4c3238c 99 u16_t src, dest;
lorcansmith 0:2a53a4c3238c 100 u8_t local_match;
lorcansmith 0:2a53a4c3238c 101 u8_t broadcast;
lorcansmith 0:2a53a4c3238c 102
lorcansmith 0:2a53a4c3238c 103 PERF_START;
lorcansmith 0:2a53a4c3238c 104
lorcansmith 0:2a53a4c3238c 105 UDP_STATS_INC(udp.recv);
lorcansmith 0:2a53a4c3238c 106
lorcansmith 0:2a53a4c3238c 107 iphdr = (struct ip_hdr *)p->payload;
lorcansmith 0:2a53a4c3238c 108
lorcansmith 0:2a53a4c3238c 109 /* Check minimum length (IP header + UDP header)
lorcansmith 0:2a53a4c3238c 110 * and move payload pointer to UDP header */
lorcansmith 0:2a53a4c3238c 111 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
lorcansmith 0:2a53a4c3238c 112 /* drop short packets */
lorcansmith 0:2a53a4c3238c 113 LWIP_DEBUGF(UDP_DEBUG,
lorcansmith 0:2a53a4c3238c 114 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
lorcansmith 0:2a53a4c3238c 115 UDP_STATS_INC(udp.lenerr);
lorcansmith 0:2a53a4c3238c 116 UDP_STATS_INC(udp.drop);
lorcansmith 0:2a53a4c3238c 117 snmp_inc_udpinerrors();
lorcansmith 0:2a53a4c3238c 118 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 119 goto end;
lorcansmith 0:2a53a4c3238c 120 }
lorcansmith 0:2a53a4c3238c 121
lorcansmith 0:2a53a4c3238c 122 udphdr = (struct udp_hdr *)p->payload;
lorcansmith 0:2a53a4c3238c 123
lorcansmith 0:2a53a4c3238c 124 /* is broadcast packet ? */
lorcansmith 0:2a53a4c3238c 125 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
lorcansmith 0:2a53a4c3238c 126
lorcansmith 0:2a53a4c3238c 127 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
lorcansmith 0:2a53a4c3238c 128 // printf("\r\nUDP_input: received datagram of length %"U16_F"\r\n", p->tot_len);
lorcansmith 0:2a53a4c3238c 129
lorcansmith 0:2a53a4c3238c 130 /* convert src and dest ports to host byte order */
lorcansmith 0:2a53a4c3238c 131 src = ntohs(udphdr->src);
lorcansmith 0:2a53a4c3238c 132 dest = ntohs(udphdr->dest);
lorcansmith 0:2a53a4c3238c 133
lorcansmith 0:2a53a4c3238c 134 udp_debug_print(udphdr);
lorcansmith 0:2a53a4c3238c 135
lorcansmith 0:2a53a4c3238c 136 /* print the UDP source and destination */
lorcansmith 0:2a53a4c3238c 137 LWIP_DEBUGF(UDP_DEBUG,
lorcansmith 0:2a53a4c3238c 138 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
lorcansmith 0:2a53a4c3238c 139 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
lorcansmith 0:2a53a4c3238c 140 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
lorcansmith 0:2a53a4c3238c 141 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
lorcansmith 0:2a53a4c3238c 142 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
lorcansmith 0:2a53a4c3238c 143 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
lorcansmith 0:2a53a4c3238c 144
lorcansmith 0:2a53a4c3238c 145 #if LWIP_DHCP
lorcansmith 0:2a53a4c3238c 146 pcb = NULL;
lorcansmith 0:2a53a4c3238c 147 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
lorcansmith 0:2a53a4c3238c 148 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
lorcansmith 0:2a53a4c3238c 149 if (dest == DHCP_CLIENT_PORT) {
lorcansmith 0:2a53a4c3238c 150 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
lorcansmith 0:2a53a4c3238c 151 if (src == DHCP_SERVER_PORT) {
lorcansmith 0:2a53a4c3238c 152 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
lorcansmith 0:2a53a4c3238c 153 /* accept the packe if
lorcansmith 0:2a53a4c3238c 154 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
lorcansmith 0:2a53a4c3238c 155 - inp->dhcp->pcb->remote == ANY or iphdr->src */
lorcansmith 0:2a53a4c3238c 156 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
lorcansmith 0:2a53a4c3238c 157 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
lorcansmith 0:2a53a4c3238c 158 pcb = inp->dhcp->pcb;
lorcansmith 0:2a53a4c3238c 159 }
lorcansmith 0:2a53a4c3238c 160 }
lorcansmith 0:2a53a4c3238c 161 }
lorcansmith 0:2a53a4c3238c 162 } else
lorcansmith 0:2a53a4c3238c 163 #endif /* LWIP_DHCP */
lorcansmith 0:2a53a4c3238c 164 {
lorcansmith 0:2a53a4c3238c 165 prev = NULL;
lorcansmith 0:2a53a4c3238c 166 local_match = 0;
lorcansmith 0:2a53a4c3238c 167 uncon_pcb = NULL;
lorcansmith 0:2a53a4c3238c 168 /* Iterate through the UDP pcb list for a matching pcb.
lorcansmith 0:2a53a4c3238c 169 * 'Perfect match' pcbs (connected to the remote port & ip address) are
lorcansmith 0:2a53a4c3238c 170 * preferred. If no perfect match is found, the first unconnected pcb that
lorcansmith 0:2a53a4c3238c 171 * matches the local port and ip address gets the datagram. */
lorcansmith 0:2a53a4c3238c 172 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
lorcansmith 0:2a53a4c3238c 173 local_match = 0;
lorcansmith 0:2a53a4c3238c 174 /* print the PCB local and remote address */
lorcansmith 0:2a53a4c3238c 175 LWIP_DEBUGF(UDP_DEBUG,
lorcansmith 0:2a53a4c3238c 176 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
lorcansmith 0:2a53a4c3238c 177 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
lorcansmith 0:2a53a4c3238c 178 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
lorcansmith 0:2a53a4c3238c 179 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
lorcansmith 0:2a53a4c3238c 180 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
lorcansmith 0:2a53a4c3238c 181 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
lorcansmith 0:2a53a4c3238c 182
lorcansmith 0:2a53a4c3238c 183 /* compare PCB local addr+port to UDP destination addr+port */
lorcansmith 0:2a53a4c3238c 184 if ((pcb->local_port == dest) &&
lorcansmith 0:2a53a4c3238c 185 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
lorcansmith 0:2a53a4c3238c 186 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
lorcansmith 0:2a53a4c3238c 187 #if LWIP_IGMP
lorcansmith 0:2a53a4c3238c 188 ip_addr_ismulticast(&current_iphdr_dest) ||
lorcansmith 0:2a53a4c3238c 189 #endif /* LWIP_IGMP */
lorcansmith 0:2a53a4c3238c 190 #if IP_SOF_BROADCAST_RECV
lorcansmith 0:2a53a4c3238c 191 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
lorcansmith 0:2a53a4c3238c 192 #else /* IP_SOF_BROADCAST_RECV */
lorcansmith 0:2a53a4c3238c 193 (broadcast))) {
lorcansmith 0:2a53a4c3238c 194 #endif /* IP_SOF_BROADCAST_RECV */
lorcansmith 0:2a53a4c3238c 195 local_match = 1;
lorcansmith 0:2a53a4c3238c 196 if ((uncon_pcb == NULL) &&
lorcansmith 0:2a53a4c3238c 197 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
lorcansmith 0:2a53a4c3238c 198 /* the first unconnected matching PCB */
lorcansmith 0:2a53a4c3238c 199 uncon_pcb = pcb;
lorcansmith 0:2a53a4c3238c 200 }
lorcansmith 0:2a53a4c3238c 201 }
lorcansmith 0:2a53a4c3238c 202 /* compare PCB remote addr+port to UDP source addr+port */
lorcansmith 0:2a53a4c3238c 203 if ((local_match != 0) &&
lorcansmith 0:2a53a4c3238c 204 (pcb->remote_port == src) &&
lorcansmith 0:2a53a4c3238c 205 (ip_addr_isany(&pcb->remote_ip) ||
lorcansmith 0:2a53a4c3238c 206 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
lorcansmith 0:2a53a4c3238c 207 /* the first fully matching PCB */
lorcansmith 0:2a53a4c3238c 208 if (prev != NULL) {
lorcansmith 0:2a53a4c3238c 209 /* move the pcb to the front of udp_pcbs so that is
lorcansmith 0:2a53a4c3238c 210 found faster next time */
lorcansmith 0:2a53a4c3238c 211 prev->next = pcb->next;
lorcansmith 0:2a53a4c3238c 212 pcb->next = udp_pcbs;
lorcansmith 0:2a53a4c3238c 213 udp_pcbs = pcb;
lorcansmith 0:2a53a4c3238c 214 } else {
lorcansmith 0:2a53a4c3238c 215 UDP_STATS_INC(udp.cachehit);
lorcansmith 0:2a53a4c3238c 216 }
lorcansmith 0:2a53a4c3238c 217 break;
lorcansmith 0:2a53a4c3238c 218 }
lorcansmith 0:2a53a4c3238c 219 prev = pcb;
lorcansmith 0:2a53a4c3238c 220 }
lorcansmith 0:2a53a4c3238c 221 /* no fully matching pcb found? then look for an unconnected pcb */
lorcansmith 0:2a53a4c3238c 222 if (pcb == NULL) {
lorcansmith 0:2a53a4c3238c 223 pcb = uncon_pcb;
lorcansmith 0:2a53a4c3238c 224 }
lorcansmith 0:2a53a4c3238c 225 }
lorcansmith 0:2a53a4c3238c 226
lorcansmith 0:2a53a4c3238c 227 /* Check checksum if this is a match or if it was directed at us. */
lorcansmith 0:2a53a4c3238c 228 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
lorcansmith 0:2a53a4c3238c 229 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\r\n"));
lorcansmith 0:2a53a4c3238c 230 #if LWIP_UDPLITE
lorcansmith 0:2a53a4c3238c 231 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
lorcansmith 0:2a53a4c3238c 232 /* Do the UDP Lite checksum */
lorcansmith 0:2a53a4c3238c 233 #if CHECKSUM_CHECK_UDP
lorcansmith 0:2a53a4c3238c 234 u16_t chklen = ntohs(udphdr->len);
lorcansmith 0:2a53a4c3238c 235 if (chklen < sizeof(struct udp_hdr)) {
lorcansmith 0:2a53a4c3238c 236 if (chklen == 0) {
lorcansmith 0:2a53a4c3238c 237 /* For UDP-Lite, checksum length of 0 means checksum
lorcansmith 0:2a53a4c3238c 238 over the complete packet (See RFC 3828 chap. 3.1) */
lorcansmith 0:2a53a4c3238c 239 chklen = p->tot_len;
lorcansmith 0:2a53a4c3238c 240 } else {
lorcansmith 0:2a53a4c3238c 241 /* At least the UDP-Lite header must be covered by the
lorcansmith 0:2a53a4c3238c 242 checksum! (Again, see RFC 3828 chap. 3.1) */
lorcansmith 0:2a53a4c3238c 243 UDP_STATS_INC(udp.chkerr);
lorcansmith 0:2a53a4c3238c 244 UDP_STATS_INC(udp.drop);
lorcansmith 0:2a53a4c3238c 245 snmp_inc_udpinerrors();
lorcansmith 0:2a53a4c3238c 246 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 247 goto end;
lorcansmith 0:2a53a4c3238c 248 }
lorcansmith 0:2a53a4c3238c 249 }
lorcansmith 0:2a53a4c3238c 250 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
lorcansmith 0:2a53a4c3238c 251 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
lorcansmith 0:2a53a4c3238c 252 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
lorcansmith 0:2a53a4c3238c 253 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
lorcansmith 0:2a53a4c3238c 254 UDP_STATS_INC(udp.chkerr);
lorcansmith 0:2a53a4c3238c 255 UDP_STATS_INC(udp.drop);
lorcansmith 0:2a53a4c3238c 256 snmp_inc_udpinerrors();
lorcansmith 0:2a53a4c3238c 257 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 258 goto end;
lorcansmith 0:2a53a4c3238c 259 }
lorcansmith 0:2a53a4c3238c 260 #endif /* CHECKSUM_CHECK_UDP */
lorcansmith 0:2a53a4c3238c 261 } else
lorcansmith 0:2a53a4c3238c 262 #endif /* LWIP_UDPLITE */
lorcansmith 0:2a53a4c3238c 263 {
lorcansmith 0:2a53a4c3238c 264 #if CHECKSUM_CHECK_UDP
lorcansmith 0:2a53a4c3238c 265 if (udphdr->chksum != 0) {
lorcansmith 0:2a53a4c3238c 266 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
lorcansmith 0:2a53a4c3238c 267 IP_PROTO_UDP, p->tot_len) != 0) {
lorcansmith 0:2a53a4c3238c 268 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
lorcansmith 0:2a53a4c3238c 269 ("udp_input: UDP datagram discarded due to failing checksum\n"));
lorcansmith 0:2a53a4c3238c 270 UDP_STATS_INC(udp.chkerr);
lorcansmith 0:2a53a4c3238c 271 UDP_STATS_INC(udp.drop);
lorcansmith 0:2a53a4c3238c 272 snmp_inc_udpinerrors();
lorcansmith 0:2a53a4c3238c 273 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 274 goto end;
lorcansmith 0:2a53a4c3238c 275 }
lorcansmith 0:2a53a4c3238c 276 }
lorcansmith 0:2a53a4c3238c 277 #endif /* CHECKSUM_CHECK_UDP */
lorcansmith 0:2a53a4c3238c 278 }
lorcansmith 0:2a53a4c3238c 279 if(pbuf_header(p, -UDP_HLEN)) {
lorcansmith 0:2a53a4c3238c 280 /* Can we cope with this failing? Just assert for now */
lorcansmith 0:2a53a4c3238c 281 LWIP_ASSERT("pbuf_header failed\n", 0);
lorcansmith 0:2a53a4c3238c 282 UDP_STATS_INC(udp.drop);
lorcansmith 0:2a53a4c3238c 283 snmp_inc_udpinerrors();
lorcansmith 0:2a53a4c3238c 284 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 285 goto end;
lorcansmith 0:2a53a4c3238c 286 }
lorcansmith 0:2a53a4c3238c 287 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 1\r\n"));
lorcansmith 0:2a53a4c3238c 288 if (pcb != NULL) {
lorcansmith 0:2a53a4c3238c 289 snmp_inc_udpindatagrams();
lorcansmith 0:2a53a4c3238c 290 #if SO_REUSE && SO_REUSE_RXTOALL
lorcansmith 0:2a53a4c3238c 291 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
lorcansmith 0:2a53a4c3238c 292 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
lorcansmith 0:2a53a4c3238c 293 /* pass broadcast- or multicast packets to all multicast pcbs
lorcansmith 0:2a53a4c3238c 294 if SOF_REUSEADDR is set on the first match */
lorcansmith 0:2a53a4c3238c 295 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 2\r\n"));
lorcansmith 0:2a53a4c3238c 296 struct udp_pcb *mpcb;
lorcansmith 0:2a53a4c3238c 297 u8_t p_header_changed = 0;
lorcansmith 0:2a53a4c3238c 298 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
lorcansmith 0:2a53a4c3238c 299 if (mpcb != pcb) {
lorcansmith 0:2a53a4c3238c 300 /* compare PCB local addr+port to UDP destination addr+port */
lorcansmith 0:2a53a4c3238c 301 if ((mpcb->local_port == dest) &&
lorcansmith 0:2a53a4c3238c 302 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
lorcansmith 0:2a53a4c3238c 303 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
lorcansmith 0:2a53a4c3238c 304 #if LWIP_IGMP
lorcansmith 0:2a53a4c3238c 305 ip_addr_ismulticast(&current_iphdr_dest) ||
lorcansmith 0:2a53a4c3238c 306 #endif /* LWIP_IGMP */
lorcansmith 0:2a53a4c3238c 307 #if IP_SOF_BROADCAST_RECV
lorcansmith 0:2a53a4c3238c 308 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
lorcansmith 0:2a53a4c3238c 309 #else /* IP_SOF_BROADCAST_RECV */
lorcansmith 0:2a53a4c3238c 310 (broadcast))) {
lorcansmith 0:2a53a4c3238c 311 #endif /* IP_SOF_BROADCAST_RECV */
lorcansmith 0:2a53a4c3238c 312 /* pass a copy of the packet to all local matches */
lorcansmith 0:2a53a4c3238c 313 if (mpcb->recv != NULL) {
lorcansmith 0:2a53a4c3238c 314 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 3\r\n"));
lorcansmith 0:2a53a4c3238c 315 struct pbuf *q;
lorcansmith 0:2a53a4c3238c 316 /* for that, move payload to IP header again */
lorcansmith 0:2a53a4c3238c 317 if (p_header_changed == 0) {
lorcansmith 0:2a53a4c3238c 318 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
lorcansmith 0:2a53a4c3238c 319 p_header_changed = 1;
lorcansmith 0:2a53a4c3238c 320 }
lorcansmith 0:2a53a4c3238c 321 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
lorcansmith 0:2a53a4c3238c 322 if (q != NULL) {
lorcansmith 0:2a53a4c3238c 323 err_t err = pbuf_copy(q, p);
lorcansmith 0:2a53a4c3238c 324 if (err == ERR_OK) {
lorcansmith 0:2a53a4c3238c 325 /* move payload to UDP data */
lorcansmith 0:2a53a4c3238c 326 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 4\r\n"));
lorcansmith 0:2a53a4c3238c 327 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
lorcansmith 0:2a53a4c3238c 328 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
lorcansmith 0:2a53a4c3238c 329 }
lorcansmith 0:2a53a4c3238c 330 }
lorcansmith 0:2a53a4c3238c 331 }
lorcansmith 0:2a53a4c3238c 332 }
lorcansmith 0:2a53a4c3238c 333 }
lorcansmith 0:2a53a4c3238c 334 }
lorcansmith 0:2a53a4c3238c 335 if (p_header_changed) {
lorcansmith 0:2a53a4c3238c 336 /* and move payload to UDP data again */
lorcansmith 0:2a53a4c3238c 337 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
lorcansmith 0:2a53a4c3238c 338 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 5\r\n"));
lorcansmith 0:2a53a4c3238c 339 }
lorcansmith 0:2a53a4c3238c 340 }
lorcansmith 0:2a53a4c3238c 341 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
lorcansmith 0:2a53a4c3238c 342 /* callback */
lorcansmith 0:2a53a4c3238c 343 if (pcb->recv != NULL) {
lorcansmith 0:2a53a4c3238c 344 /* now the recv function is responsible for freeing p */
lorcansmith 0:2a53a4c3238c 345 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 6: src %d\r\n", src));
lorcansmith 0:2a53a4c3238c 346 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
lorcansmith 0:2a53a4c3238c 347 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 6a\r\n"));
lorcansmith 0:2a53a4c3238c 348 } else {
lorcansmith 0:2a53a4c3238c 349 /* no recv function registered? then we have to free the pbuf! */
lorcansmith 0:2a53a4c3238c 350 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 351 goto end;
lorcansmith 0:2a53a4c3238c 352 }
lorcansmith 0:2a53a4c3238c 353 } else {
lorcansmith 0:2a53a4c3238c 354 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
lorcansmith 0:2a53a4c3238c 355
lorcansmith 0:2a53a4c3238c 356 #if LWIP_ICMP
lorcansmith 0:2a53a4c3238c 357 /* No match was found, send ICMP destination port unreachable unless
lorcansmith 0:2a53a4c3238c 358 destination address was broadcast/multicast. */
lorcansmith 0:2a53a4c3238c 359 if (!broadcast &&
lorcansmith 0:2a53a4c3238c 360 !ip_addr_ismulticast(&current_iphdr_dest)) {
lorcansmith 0:2a53a4c3238c 361 /* move payload pointer back to ip header */
lorcansmith 0:2a53a4c3238c 362 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
lorcansmith 0:2a53a4c3238c 363 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
lorcansmith 0:2a53a4c3238c 364 icmp_dest_unreach(p, ICMP_DUR_PORT);
lorcansmith 0:2a53a4c3238c 365 }
lorcansmith 0:2a53a4c3238c 366 #endif /* LWIP_ICMP */
lorcansmith 0:2a53a4c3238c 367 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 7\r\n"));
lorcansmith 0:2a53a4c3238c 368 UDP_STATS_INC(udp.proterr);
lorcansmith 0:2a53a4c3238c 369 UDP_STATS_INC(udp.drop);
lorcansmith 0:2a53a4c3238c 370 snmp_inc_udpnoports();
lorcansmith 0:2a53a4c3238c 371 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 372 }
lorcansmith 0:2a53a4c3238c 373 } else {
lorcansmith 0:2a53a4c3238c 374 pbuf_free(p);
lorcansmith 0:2a53a4c3238c 375 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: OK 8\r\n"));
lorcansmith 0:2a53a4c3238c 376 }
lorcansmith 0:2a53a4c3238c 377 end:
lorcansmith 0:2a53a4c3238c 378 PERF_STOP("udp_input");
lorcansmith 0:2a53a4c3238c 379 }
lorcansmith 0:2a53a4c3238c 380
lorcansmith 0:2a53a4c3238c 381 /**
lorcansmith 0:2a53a4c3238c 382 * Send data using UDP.
lorcansmith 0:2a53a4c3238c 383 *
lorcansmith 0:2a53a4c3238c 384 * @param pcb UDP PCB used to send the data.
lorcansmith 0:2a53a4c3238c 385 * @param p chain of pbuf's to be sent.
lorcansmith 0:2a53a4c3238c 386 *
lorcansmith 0:2a53a4c3238c 387 * The datagram will be sent to the current remote_ip & remote_port
lorcansmith 0:2a53a4c3238c 388 * stored in pcb. If the pcb is not bound to a port, it will
lorcansmith 0:2a53a4c3238c 389 * automatically be bound to a random port.
lorcansmith 0:2a53a4c3238c 390 *
lorcansmith 0:2a53a4c3238c 391 * @return lwIP error code.
lorcansmith 0:2a53a4c3238c 392 * - ERR_OK. Successful. No error occured.
lorcansmith 0:2a53a4c3238c 393 * - ERR_MEM. Out of memory.
lorcansmith 0:2a53a4c3238c 394 * - ERR_RTE. Could not find route to destination address.
lorcansmith 0:2a53a4c3238c 395 * - More errors could be returned by lower protocol layers.
lorcansmith 0:2a53a4c3238c 396 *
lorcansmith 0:2a53a4c3238c 397 * @see udp_disconnect() udp_sendto()
lorcansmith 0:2a53a4c3238c 398 */
lorcansmith 0:2a53a4c3238c 399 err_t
lorcansmith 0:2a53a4c3238c 400 udp_send(struct udp_pcb *pcb, struct pbuf *p)
lorcansmith 0:2a53a4c3238c 401 {
lorcansmith 0:2a53a4c3238c 402 /* send to the packet using remote ip and port stored in the pcb */
lorcansmith 0:2a53a4c3238c 403 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
lorcansmith 0:2a53a4c3238c 404 }
lorcansmith 0:2a53a4c3238c 405
lorcansmith 0:2a53a4c3238c 406 #if LWIP_CHECKSUM_ON_COPY
lorcansmith 0:2a53a4c3238c 407 /** Same as udp_send() but with checksum
lorcansmith 0:2a53a4c3238c 408 */
lorcansmith 0:2a53a4c3238c 409 err_t
lorcansmith 0:2a53a4c3238c 410 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
lorcansmith 0:2a53a4c3238c 411 u8_t have_chksum, u16_t chksum)
lorcansmith 0:2a53a4c3238c 412 {
lorcansmith 0:2a53a4c3238c 413 /* send to the packet using remote ip and port stored in the pcb */
lorcansmith 0:2a53a4c3238c 414 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
lorcansmith 0:2a53a4c3238c 415 have_chksum, chksum);
lorcansmith 0:2a53a4c3238c 416 }
lorcansmith 0:2a53a4c3238c 417 #endif /* LWIP_CHECKSUM_ON_COPY */
lorcansmith 0:2a53a4c3238c 418
lorcansmith 0:2a53a4c3238c 419 /**
lorcansmith 0:2a53a4c3238c 420 * Send data to a specified address using UDP.
lorcansmith 0:2a53a4c3238c 421 *
lorcansmith 0:2a53a4c3238c 422 * @param pcb UDP PCB used to send the data.
lorcansmith 0:2a53a4c3238c 423 * @param p chain of pbuf's to be sent.
lorcansmith 0:2a53a4c3238c 424 * @param dst_ip Destination IP address.
lorcansmith 0:2a53a4c3238c 425 * @param dst_port Destination UDP port.
lorcansmith 0:2a53a4c3238c 426 *
lorcansmith 0:2a53a4c3238c 427 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
lorcansmith 0:2a53a4c3238c 428 *
lorcansmith 0:2a53a4c3238c 429 * If the PCB already has a remote address association, it will
lorcansmith 0:2a53a4c3238c 430 * be restored after the data is sent.
lorcansmith 0:2a53a4c3238c 431 *
lorcansmith 0:2a53a4c3238c 432 * @return lwIP error code (@see udp_send for possible error codes)
lorcansmith 0:2a53a4c3238c 433 *
lorcansmith 0:2a53a4c3238c 434 * @see udp_disconnect() udp_send()
lorcansmith 0:2a53a4c3238c 435 */
lorcansmith 0:2a53a4c3238c 436 err_t
lorcansmith 0:2a53a4c3238c 437 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
lorcansmith 0:2a53a4c3238c 438 ip_addr_t *dst_ip, u16_t dst_port)
lorcansmith 0:2a53a4c3238c 439 {
lorcansmith 0:2a53a4c3238c 440 #if LWIP_CHECKSUM_ON_COPY
lorcansmith 0:2a53a4c3238c 441 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
lorcansmith 0:2a53a4c3238c 442 }
lorcansmith 0:2a53a4c3238c 443
lorcansmith 0:2a53a4c3238c 444 /** Same as udp_sendto(), but with checksum */
lorcansmith 0:2a53a4c3238c 445 err_t
lorcansmith 0:2a53a4c3238c 446 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
lorcansmith 0:2a53a4c3238c 447 u16_t dst_port, u8_t have_chksum, u16_t chksum)
lorcansmith 0:2a53a4c3238c 448 {
lorcansmith 0:2a53a4c3238c 449 #endif /* LWIP_CHECKSUM_ON_COPY */
lorcansmith 0:2a53a4c3238c 450 struct netif *netif;
lorcansmith 0:2a53a4c3238c 451
lorcansmith 0:2a53a4c3238c 452 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
lorcansmith 0:2a53a4c3238c 453
lorcansmith 0:2a53a4c3238c 454 /* find the outgoing network interface for this packet */
lorcansmith 0:2a53a4c3238c 455 #if LWIP_IGMP
lorcansmith 0:2a53a4c3238c 456 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
lorcansmith 0:2a53a4c3238c 457 #else
lorcansmith 0:2a53a4c3238c 458 netif = ip_route(dst_ip);
lorcansmith 0:2a53a4c3238c 459 #endif /* LWIP_IGMP */
lorcansmith 0:2a53a4c3238c 460
lorcansmith 0:2a53a4c3238c 461 /* no outgoing network interface could be found? */
lorcansmith 0:2a53a4c3238c 462 if (netif == NULL) {
lorcansmith 0:2a53a4c3238c 463 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
lorcansmith 0:2a53a4c3238c 464 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
lorcansmith 0:2a53a4c3238c 465 UDP_STATS_INC(udp.rterr);
lorcansmith 0:2a53a4c3238c 466 return ERR_RTE;
lorcansmith 0:2a53a4c3238c 467 }
lorcansmith 0:2a53a4c3238c 468 #if LWIP_CHECKSUM_ON_COPY
lorcansmith 0:2a53a4c3238c 469 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
lorcansmith 0:2a53a4c3238c 470 #else /* LWIP_CHECKSUM_ON_COPY */
lorcansmith 0:2a53a4c3238c 471 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
lorcansmith 0:2a53a4c3238c 472 #endif /* LWIP_CHECKSUM_ON_COPY */
lorcansmith 0:2a53a4c3238c 473 }
lorcansmith 0:2a53a4c3238c 474
lorcansmith 0:2a53a4c3238c 475 /**
lorcansmith 0:2a53a4c3238c 476 * Send data to a specified address using UDP.
lorcansmith 0:2a53a4c3238c 477 * The netif used for sending can be specified.
lorcansmith 0:2a53a4c3238c 478 *
lorcansmith 0:2a53a4c3238c 479 * This function exists mainly for DHCP, to be able to send UDP packets
lorcansmith 0:2a53a4c3238c 480 * on a netif that is still down.
lorcansmith 0:2a53a4c3238c 481 *
lorcansmith 0:2a53a4c3238c 482 * @param pcb UDP PCB used to send the data.
lorcansmith 0:2a53a4c3238c 483 * @param p chain of pbuf's to be sent.
lorcansmith 0:2a53a4c3238c 484 * @param dst_ip Destination IP address.
lorcansmith 0:2a53a4c3238c 485 * @param dst_port Destination UDP port.
lorcansmith 0:2a53a4c3238c 486 * @param netif the netif used for sending.
lorcansmith 0:2a53a4c3238c 487 *
lorcansmith 0:2a53a4c3238c 488 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
lorcansmith 0:2a53a4c3238c 489 *
lorcansmith 0:2a53a4c3238c 490 * @return lwIP error code (@see udp_send for possible error codes)
lorcansmith 0:2a53a4c3238c 491 *
lorcansmith 0:2a53a4c3238c 492 * @see udp_disconnect() udp_send()
lorcansmith 0:2a53a4c3238c 493 */
lorcansmith 0:2a53a4c3238c 494 err_t
lorcansmith 0:2a53a4c3238c 495 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
lorcansmith 0:2a53a4c3238c 496 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
lorcansmith 0:2a53a4c3238c 497 {
lorcansmith 0:2a53a4c3238c 498 #if LWIP_CHECKSUM_ON_COPY
lorcansmith 0:2a53a4c3238c 499 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
lorcansmith 0:2a53a4c3238c 500 }
lorcansmith 0:2a53a4c3238c 501
lorcansmith 0:2a53a4c3238c 502 /** Same as udp_sendto_if(), but with checksum */
lorcansmith 0:2a53a4c3238c 503 err_t
lorcansmith 0:2a53a4c3238c 504 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
lorcansmith 0:2a53a4c3238c 505 u16_t dst_port, struct netif *netif, u8_t have_chksum,
lorcansmith 0:2a53a4c3238c 506 u16_t chksum)
lorcansmith 0:2a53a4c3238c 507 {
lorcansmith 0:2a53a4c3238c 508 #endif /* LWIP_CHECKSUM_ON_COPY */
lorcansmith 0:2a53a4c3238c 509 struct udp_hdr *udphdr;
lorcansmith 0:2a53a4c3238c 510 ip_addr_t *src_ip;
lorcansmith 0:2a53a4c3238c 511 err_t err;
lorcansmith 0:2a53a4c3238c 512 struct pbuf *q; /* q will be sent down the stack */
lorcansmith 0:2a53a4c3238c 513
lorcansmith 0:2a53a4c3238c 514 #if IP_SOF_BROADCAST
lorcansmith 0:2a53a4c3238c 515 /* broadcast filter? */
lorcansmith 0:2a53a4c3238c 516 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
lorcansmith 0:2a53a4c3238c 517 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
lorcansmith 0:2a53a4c3238c 518 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
lorcansmith 0:2a53a4c3238c 519 return ERR_VAL;
lorcansmith 0:2a53a4c3238c 520 }
lorcansmith 0:2a53a4c3238c 521 #endif /* IP_SOF_BROADCAST */
lorcansmith 0:2a53a4c3238c 522
lorcansmith 0:2a53a4c3238c 523 /* if the PCB is not yet bound to a port, bind it here */
lorcansmith 0:2a53a4c3238c 524 if (pcb->local_port == 0) {
lorcansmith 0:2a53a4c3238c 525 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
lorcansmith 0:2a53a4c3238c 526 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
lorcansmith 0:2a53a4c3238c 527 printf("\r\nudp_send: not yet bound to a port, binding to %d\r\n", pcb->local_port);
lorcansmith 0:2a53a4c3238c 528 if (err != ERR_OK) {
lorcansmith 0:2a53a4c3238c 529 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
lorcansmith 0:2a53a4c3238c 530 return err;
lorcansmith 0:2a53a4c3238c 531 }
lorcansmith 0:2a53a4c3238c 532 }
lorcansmith 0:2a53a4c3238c 533
lorcansmith 0:2a53a4c3238c 534 /* not enough space to add an UDP header to first pbuf in given p chain? */
lorcansmith 0:2a53a4c3238c 535 if (pbuf_header(p, UDP_HLEN)) {
lorcansmith 0:2a53a4c3238c 536 /* allocate header in a separate new pbuf */
lorcansmith 0:2a53a4c3238c 537 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
lorcansmith 0:2a53a4c3238c 538 /* new header pbuf could not be allocated? */
lorcansmith 0:2a53a4c3238c 539 if (q == NULL) {
lorcansmith 0:2a53a4c3238c 540 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
lorcansmith 0:2a53a4c3238c 541 return ERR_MEM;
lorcansmith 0:2a53a4c3238c 542 }
lorcansmith 0:2a53a4c3238c 543 /* chain header q in front of given pbuf p */
lorcansmith 0:2a53a4c3238c 544 pbuf_chain(q, p);
lorcansmith 0:2a53a4c3238c 545 /* first pbuf q points to header pbuf */
lorcansmith 0:2a53a4c3238c 546 LWIP_DEBUGF(UDP_DEBUG,
lorcansmith 0:2a53a4c3238c 547 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
lorcansmith 0:2a53a4c3238c 548 } else {
lorcansmith 0:2a53a4c3238c 549 /* adding space for header within p succeeded */
lorcansmith 0:2a53a4c3238c 550 /* first pbuf q equals given pbuf */
lorcansmith 0:2a53a4c3238c 551 q = p;
lorcansmith 0:2a53a4c3238c 552 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
lorcansmith 0:2a53a4c3238c 553 }
lorcansmith 0:2a53a4c3238c 554 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
lorcansmith 0:2a53a4c3238c 555 (q->len >= sizeof(struct udp_hdr)));
lorcansmith 0:2a53a4c3238c 556 /* q now represents the packet to be sent */
lorcansmith 0:2a53a4c3238c 557 udphdr = (struct udp_hdr *)q->payload;
lorcansmith 0:2a53a4c3238c 558 udphdr->src = htons(pcb->local_port);
lorcansmith 0:2a53a4c3238c 559 udphdr->dest = htons(dst_port);
lorcansmith 0:2a53a4c3238c 560 printf("udp_sendto_if: local %d dst %d q->len %d\r\n", pcb->local_port, dst_port, q->len);
lorcansmith 0:2a53a4c3238c 561 /* in UDP, 0 checksum means 'no checksum' */
lorcansmith 0:2a53a4c3238c 562 udphdr->chksum = 0x0000;
lorcansmith 0:2a53a4c3238c 563
lorcansmith 0:2a53a4c3238c 564 /* Multicast Loop? */
lorcansmith 0:2a53a4c3238c 565 #if LWIP_IGMP
lorcansmith 0:2a53a4c3238c 566 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
lorcansmith 0:2a53a4c3238c 567 q->flags |= PBUF_FLAG_MCASTLOOP;
lorcansmith 0:2a53a4c3238c 568 }
lorcansmith 0:2a53a4c3238c 569 #endif /* LWIP_IGMP */
lorcansmith 0:2a53a4c3238c 570
lorcansmith 0:2a53a4c3238c 571
lorcansmith 0:2a53a4c3238c 572 /* PCB local address is IP_ANY_ADDR? */
lorcansmith 0:2a53a4c3238c 573 if (ip_addr_isany(&pcb->local_ip)) {
lorcansmith 0:2a53a4c3238c 574 /* use outgoing network interface IP address as source address */
lorcansmith 0:2a53a4c3238c 575 src_ip = &(netif->ip_addr);
lorcansmith 0:2a53a4c3238c 576 } else {
lorcansmith 0:2a53a4c3238c 577 /* check if UDP PCB local IP address is correct
lorcansmith 0:2a53a4c3238c 578 * this could be an old address if netif->ip_addr has changed */
lorcansmith 0:2a53a4c3238c 579 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
lorcansmith 0:2a53a4c3238c 580 /* local_ip doesn't match, drop the packet */
lorcansmith 0:2a53a4c3238c 581 if (q != p) {
lorcansmith 0:2a53a4c3238c 582 /* free the header pbuf */
lorcansmith 0:2a53a4c3238c 583 pbuf_free(q);
lorcansmith 0:2a53a4c3238c 584 q = NULL;
lorcansmith 0:2a53a4c3238c 585 /* p is still referenced by the caller, and will live on */
lorcansmith 0:2a53a4c3238c 586 }
lorcansmith 0:2a53a4c3238c 587 return ERR_VAL;
lorcansmith 0:2a53a4c3238c 588 }
lorcansmith 0:2a53a4c3238c 589 /* use UDP PCB local IP address as source address */
lorcansmith 0:2a53a4c3238c 590 src_ip = &(pcb->local_ip);
lorcansmith 0:2a53a4c3238c 591 }
lorcansmith 0:2a53a4c3238c 592
lorcansmith 0:2a53a4c3238c 593 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
lorcansmith 0:2a53a4c3238c 594 //printf("\r\nudp_sendto_if: sending datagram of length %"U16_F"\r\n", q->tot_len);
lorcansmith 0:2a53a4c3238c 595
lorcansmith 0:2a53a4c3238c 596 #if LWIP_UDPLITE
lorcansmith 0:2a53a4c3238c 597 /* UDP Lite protocol? */
lorcansmith 0:2a53a4c3238c 598 if (pcb->flags & UDP_FLAGS_UDPLITE) {
lorcansmith 0:2a53a4c3238c 599 u16_t chklen, chklen_hdr;
lorcansmith 0:2a53a4c3238c 600 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
lorcansmith 0:2a53a4c3238c 601 /* set UDP message length in UDP header */
lorcansmith 0:2a53a4c3238c 602 chklen_hdr = chklen = pcb->chksum_len_tx;
lorcansmith 0:2a53a4c3238c 603 printf("\r\nudp_sendto_if: LWIP_UDPLITE chklen %d"\r\n", chklen);
lorcansmith 0:2a53a4c3238c 604 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
lorcansmith 0:2a53a4c3238c 605 if (chklen != 0) {
lorcansmith 0:2a53a4c3238c 606 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
lorcansmith 0:2a53a4c3238c 607 }
lorcansmith 0:2a53a4c3238c 608 /* For UDP-Lite, checksum length of 0 means checksum
lorcansmith 0:2a53a4c3238c 609 over the complete packet. (See RFC 3828 chap. 3.1)
lorcansmith 0:2a53a4c3238c 610 At least the UDP-Lite header must be covered by the
lorcansmith 0:2a53a4c3238c 611 checksum, therefore, if chksum_len has an illegal
lorcansmith 0:2a53a4c3238c 612 value, we generate the checksum over the complete
lorcansmith 0:2a53a4c3238c 613 packet to be safe. */
lorcansmith 0:2a53a4c3238c 614 chklen_hdr = 0;
lorcansmith 0:2a53a4c3238c 615 chklen = q->tot_len;
lorcansmith 0:2a53a4c3238c 616 }
lorcansmith 0:2a53a4c3238c 617 udphdr->len = htons(chklen_hdr);
lorcansmith 0:2a53a4c3238c 618 /* calculate checksum */
lorcansmith 0:2a53a4c3238c 619 #if CHECKSUM_GEN_UDP
lorcansmith 0:2a53a4c3238c 620 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
lorcansmith 0:2a53a4c3238c 621 IP_PROTO_UDPLITE, q->tot_len,
lorcansmith 0:2a53a4c3238c 622 #if !LWIP_CHECKSUM_ON_COPY
lorcansmith 0:2a53a4c3238c 623 chklen);
lorcansmith 0:2a53a4c3238c 624 #else /* !LWIP_CHECKSUM_ON_COPY */
lorcansmith 0:2a53a4c3238c 625 (have_chksum ? UDP_HLEN : chklen));
lorcansmith 0:2a53a4c3238c 626 if (have_chksum) {
lorcansmith 0:2a53a4c3238c 627 u32_t acc;
lorcansmith 0:2a53a4c3238c 628 acc = udphdr->chksum + (u16_t)~(chksum);
lorcansmith 0:2a53a4c3238c 629 udphdr->chksum = FOLD_U32T(acc);
lorcansmith 0:2a53a4c3238c 630 }
lorcansmith 0:2a53a4c3238c 631 #endif /* !LWIP_CHECKSUM_ON_COPY */
lorcansmith 0:2a53a4c3238c 632
lorcansmith 0:2a53a4c3238c 633 /* chksum zero must become 0xffff, as zero means 'no checksum' */
lorcansmith 0:2a53a4c3238c 634 if (udphdr->chksum == 0x0000) {
lorcansmith 0:2a53a4c3238c 635 udphdr->chksum = 0xffff;
lorcansmith 0:2a53a4c3238c 636 }
lorcansmith 0:2a53a4c3238c 637 #endif /* CHECKSUM_GEN_UDP */
lorcansmith 0:2a53a4c3238c 638 /* output to IP */
lorcansmith 0:2a53a4c3238c 639 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
lorcansmith 0:2a53a4c3238c 640 #if LWIP_NETIF_HWADDRHINT
lorcansmith 0:2a53a4c3238c 641 netif->addr_hint = &(pcb->addr_hint);
lorcansmith 0:2a53a4c3238c 642 #endif /* LWIP_NETIF_HWADDRHINT*/
lorcansmith 0:2a53a4c3238c 643 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
lorcansmith 0:2a53a4c3238c 644 #if LWIP_NETIF_HWADDRHINT
lorcansmith 0:2a53a4c3238c 645 netif->addr_hint = NULL;
lorcansmith 0:2a53a4c3238c 646 #endif /* LWIP_NETIF_HWADDRHINT*/
lorcansmith 0:2a53a4c3238c 647 } else
lorcansmith 0:2a53a4c3238c 648 #endif /* LWIP_UDPLITE */
lorcansmith 0:2a53a4c3238c 649 { /* UDP */
lorcansmith 0:2a53a4c3238c 650 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
lorcansmith 0:2a53a4c3238c 651 //printf("\r\nudp_sendto_if: UDP packet length %d\r\n", q->tot_len);
lorcansmith 0:2a53a4c3238c 652 udphdr->len = htons(q->tot_len);
lorcansmith 0:2a53a4c3238c 653 /* calculate checksum */
lorcansmith 0:2a53a4c3238c 654 #if CHECKSUM_GEN_UDP
lorcansmith 0:2a53a4c3238c 655 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
lorcansmith 0:2a53a4c3238c 656 u16_t udpchksum;
lorcansmith 0:2a53a4c3238c 657 #if LWIP_CHECKSUM_ON_COPY
lorcansmith 0:2a53a4c3238c 658 if (have_chksum) {
lorcansmith 0:2a53a4c3238c 659 u32_t acc;
lorcansmith 0:2a53a4c3238c 660 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
lorcansmith 0:2a53a4c3238c 661 q->tot_len, UDP_HLEN);
lorcansmith 0:2a53a4c3238c 662 acc = udpchksum + (u16_t)~(chksum);
lorcansmith 0:2a53a4c3238c 663 udpchksum = FOLD_U32T(acc);
lorcansmith 0:2a53a4c3238c 664 } else
lorcansmith 0:2a53a4c3238c 665 #endif /* LWIP_CHECKSUM_ON_COPY */
lorcansmith 0:2a53a4c3238c 666 {
lorcansmith 0:2a53a4c3238c 667 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
lorcansmith 0:2a53a4c3238c 668 }
lorcansmith 0:2a53a4c3238c 669
lorcansmith 0:2a53a4c3238c 670 /* chksum zero must become 0xffff, as zero means 'no checksum' */
lorcansmith 0:2a53a4c3238c 671 if (udpchksum == 0x0000) {
lorcansmith 0:2a53a4c3238c 672 udpchksum = 0xffff;
lorcansmith 0:2a53a4c3238c 673 }
lorcansmith 0:2a53a4c3238c 674 udphdr->chksum = udpchksum;
lorcansmith 0:2a53a4c3238c 675 }
lorcansmith 0:2a53a4c3238c 676 #endif /* CHECKSUM_GEN_UDP */
lorcansmith 0:2a53a4c3238c 677 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
lorcansmith 0:2a53a4c3238c 678 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
lorcansmith 0:2a53a4c3238c 679 /* output to IP */
lorcansmith 0:2a53a4c3238c 680 #if LWIP_NETIF_HWADDRHINT
lorcansmith 0:2a53a4c3238c 681 netif->addr_hint = &(pcb->addr_hint);
lorcansmith 0:2a53a4c3238c 682 #endif /* LWIP_NETIF_HWADDRHINT*/
lorcansmith 0:2a53a4c3238c 683 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
lorcansmith 0:2a53a4c3238c 684 printf("udp_sendto_if: ip_output_if error %d\r\n", err);
lorcansmith 0:2a53a4c3238c 685 #if LWIP_NETIF_HWADDRHINT
lorcansmith 0:2a53a4c3238c 686 netif->addr_hint = NULL;
lorcansmith 0:2a53a4c3238c 687 #endif /* LWIP_NETIF_HWADDRHINT*/
lorcansmith 0:2a53a4c3238c 688 }
lorcansmith 0:2a53a4c3238c 689 /* TODO: must this be increased even if error occured? */
lorcansmith 0:2a53a4c3238c 690 snmp_inc_udpoutdatagrams();
lorcansmith 0:2a53a4c3238c 691
lorcansmith 0:2a53a4c3238c 692 /* did we chain a separate header pbuf earlier? */
lorcansmith 0:2a53a4c3238c 693 if (q != p) {
lorcansmith 0:2a53a4c3238c 694 /* free the header pbuf */
lorcansmith 0:2a53a4c3238c 695 pbuf_free(q);
lorcansmith 0:2a53a4c3238c 696 q = NULL;
lorcansmith 0:2a53a4c3238c 697 /* p is still referenced by the caller, and will live on */
lorcansmith 0:2a53a4c3238c 698 }
lorcansmith 0:2a53a4c3238c 699
lorcansmith 0:2a53a4c3238c 700 UDP_STATS_INC(udp.xmit);
lorcansmith 0:2a53a4c3238c 701 return err;
lorcansmith 0:2a53a4c3238c 702 }
lorcansmith 0:2a53a4c3238c 703
lorcansmith 0:2a53a4c3238c 704 /**
lorcansmith 0:2a53a4c3238c 705 * Bind an UDP PCB.
lorcansmith 0:2a53a4c3238c 706 *
lorcansmith 0:2a53a4c3238c 707 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
lorcansmith 0:2a53a4c3238c 708 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
lorcansmith 0:2a53a4c3238c 709 * bind to all local interfaces.
lorcansmith 0:2a53a4c3238c 710 * @param port local UDP port to bind with. Use 0 to automatically bind
lorcansmith 0:2a53a4c3238c 711 * to a random port between UDP_LOCAL_PORT_RANGE_START and
lorcansmith 0:2a53a4c3238c 712 * UDP_LOCAL_PORT_RANGE_END.
lorcansmith 0:2a53a4c3238c 713 *
lorcansmith 0:2a53a4c3238c 714 * ipaddr & port are expected to be in the same byte order as in the pcb.
lorcansmith 0:2a53a4c3238c 715 *
lorcansmith 0:2a53a4c3238c 716 * @return lwIP error code.
lorcansmith 0:2a53a4c3238c 717 * - ERR_OK. Successful. No error occured.
lorcansmith 0:2a53a4c3238c 718 * - ERR_USE. The specified ipaddr and port are already bound to by
lorcansmith 0:2a53a4c3238c 719 * another UDP PCB.
lorcansmith 0:2a53a4c3238c 720 *
lorcansmith 0:2a53a4c3238c 721 * @see udp_disconnect()
lorcansmith 0:2a53a4c3238c 722 */
lorcansmith 0:2a53a4c3238c 723 err_t
lorcansmith 0:2a53a4c3238c 724 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
lorcansmith 0:2a53a4c3238c 725 {
lorcansmith 0:2a53a4c3238c 726 struct udp_pcb *ipcb;
lorcansmith 0:2a53a4c3238c 727 u8_t rebind;
lorcansmith 0:2a53a4c3238c 728
lorcansmith 0:2a53a4c3238c 729 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
lorcansmith 0:2a53a4c3238c 730 ip_addr_debug_print(UDP_DEBUG, ipaddr);
lorcansmith 0:2a53a4c3238c 731 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
lorcansmith 0:2a53a4c3238c 732 printf("\r\nUDP_bind: IP Address %d.%d.%d.%d\r\n", ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
lorcansmith 0:2a53a4c3238c 733 printf("\r\nUDP_bind: port %"U16_F"\r\n", port);
lorcansmith 0:2a53a4c3238c 734
lorcansmith 0:2a53a4c3238c 735 rebind = 0;
lorcansmith 0:2a53a4c3238c 736 /* Check for double bind and rebind of the same pcb */
lorcansmith 0:2a53a4c3238c 737 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
lorcansmith 0:2a53a4c3238c 738 /* is this UDP PCB already on active list? */
lorcansmith 0:2a53a4c3238c 739 if (pcb == ipcb) {
lorcansmith 0:2a53a4c3238c 740 /* pcb may occur at most once in active list */
lorcansmith 0:2a53a4c3238c 741 LWIP_ASSERT("rebind == 0", rebind == 0);
lorcansmith 0:2a53a4c3238c 742 /* pcb already in list, just rebind */
lorcansmith 0:2a53a4c3238c 743 rebind = 1;
lorcansmith 0:2a53a4c3238c 744 }
lorcansmith 0:2a53a4c3238c 745
lorcansmith 0:2a53a4c3238c 746 /* By default, we don't allow to bind to a port that any other udp
lorcansmith 0:2a53a4c3238c 747 PCB is alread bound to, unless *all* PCBs with that port have tha
lorcansmith 0:2a53a4c3238c 748 REUSEADDR flag set. */
lorcansmith 0:2a53a4c3238c 749 #if SO_REUSE
lorcansmith 0:2a53a4c3238c 750 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
lorcansmith 0:2a53a4c3238c 751 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
lorcansmith 0:2a53a4c3238c 752 #else /* SO_REUSE */
lorcansmith 0:2a53a4c3238c 753 /* port matches that of PCB in list and REUSEADDR not set -> reject */
lorcansmith 0:2a53a4c3238c 754 else {
lorcansmith 0:2a53a4c3238c 755 #endif /* SO_REUSE */
lorcansmith 0:2a53a4c3238c 756 if ((ipcb->local_port == port) &&
lorcansmith 0:2a53a4c3238c 757 /* IP address matches, or one is IP_ADDR_ANY? */
lorcansmith 0:2a53a4c3238c 758 (ip_addr_isany(&(ipcb->local_ip)) ||
lorcansmith 0:2a53a4c3238c 759 ip_addr_isany(ipaddr) ||
lorcansmith 0:2a53a4c3238c 760 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
lorcansmith 0:2a53a4c3238c 761 /* other PCB already binds to this local IP and port */
lorcansmith 0:2a53a4c3238c 762 LWIP_DEBUGF(UDP_DEBUG,
lorcansmith 0:2a53a4c3238c 763 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
lorcansmith 0:2a53a4c3238c 764 return ERR_USE;
lorcansmith 0:2a53a4c3238c 765 }
lorcansmith 0:2a53a4c3238c 766 }
lorcansmith 0:2a53a4c3238c 767 }
lorcansmith 0:2a53a4c3238c 768
lorcansmith 0:2a53a4c3238c 769 ip_addr_set(&pcb->local_ip, ipaddr);
lorcansmith 0:2a53a4c3238c 770
lorcansmith 0:2a53a4c3238c 771 /* no port specified? */
lorcansmith 0:2a53a4c3238c 772 if (port == 0) {
lorcansmith 0:2a53a4c3238c 773 #ifndef UDP_LOCAL_PORT_RANGE_START
lorcansmith 0:2a53a4c3238c 774 #define UDP_LOCAL_PORT_RANGE_START 4096
lorcansmith 0:2a53a4c3238c 775 #define UDP_LOCAL_PORT_RANGE_END 0x7fff
lorcansmith 0:2a53a4c3238c 776 #endif
lorcansmith 0:2a53a4c3238c 777 port = UDP_LOCAL_PORT_RANGE_START;
lorcansmith 0:2a53a4c3238c 778 ipcb = udp_pcbs;
lorcansmith 0:2a53a4c3238c 779 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
lorcansmith 0:2a53a4c3238c 780 if (ipcb->local_port == port) {
lorcansmith 0:2a53a4c3238c 781 /* port is already used by another udp_pcb */
lorcansmith 0:2a53a4c3238c 782 port++;
lorcansmith 0:2a53a4c3238c 783 /* restart scanning all udp pcbs */
lorcansmith 0:2a53a4c3238c 784 ipcb = udp_pcbs;
lorcansmith 0:2a53a4c3238c 785 } else {
lorcansmith 0:2a53a4c3238c 786 /* go on with next udp pcb */
lorcansmith 0:2a53a4c3238c 787 ipcb = ipcb->next;
lorcansmith 0:2a53a4c3238c 788 }
lorcansmith 0:2a53a4c3238c 789 }
lorcansmith 0:2a53a4c3238c 790 if (ipcb != NULL) {
lorcansmith 0:2a53a4c3238c 791 /* no more ports available in local range */
lorcansmith 0:2a53a4c3238c 792 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
lorcansmith 0:2a53a4c3238c 793 return ERR_USE;
lorcansmith 0:2a53a4c3238c 794 }
lorcansmith 0:2a53a4c3238c 795 }
lorcansmith 0:2a53a4c3238c 796 pcb->local_port = port;
lorcansmith 0:2a53a4c3238c 797 snmp_insert_udpidx_tree(pcb);
lorcansmith 0:2a53a4c3238c 798 /* pcb not active yet? */
lorcansmith 0:2a53a4c3238c 799 if (rebind == 0) {
lorcansmith 0:2a53a4c3238c 800 /* place the PCB on the active list if not already there */
lorcansmith 0:2a53a4c3238c 801 pcb->next = udp_pcbs;
lorcansmith 0:2a53a4c3238c 802 udp_pcbs = pcb;
lorcansmith 0:2a53a4c3238c 803 }
lorcansmith 0:2a53a4c3238c 804 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
lorcansmith 0:2a53a4c3238c 805 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
lorcansmith 0:2a53a4c3238c 806 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
lorcansmith 0:2a53a4c3238c 807 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
lorcansmith 0:2a53a4c3238c 808 pcb->local_port));
lorcansmith 0:2a53a4c3238c 809 return ERR_OK;
lorcansmith 0:2a53a4c3238c 810 }
lorcansmith 0:2a53a4c3238c 811 /**
lorcansmith 0:2a53a4c3238c 812 * Connect an UDP PCB.
lorcansmith 0:2a53a4c3238c 813 *
lorcansmith 0:2a53a4c3238c 814 * This will associate the UDP PCB with the remote address.
lorcansmith 0:2a53a4c3238c 815 *
lorcansmith 0:2a53a4c3238c 816 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
lorcansmith 0:2a53a4c3238c 817 * @param ipaddr remote IP address to connect with.
lorcansmith 0:2a53a4c3238c 818 * @param port remote UDP port to connect with.
lorcansmith 0:2a53a4c3238c 819 *
lorcansmith 0:2a53a4c3238c 820 * @return lwIP error code
lorcansmith 0:2a53a4c3238c 821 *
lorcansmith 0:2a53a4c3238c 822 * ipaddr & port are expected to be in the same byte order as in the pcb.
lorcansmith 0:2a53a4c3238c 823 *
lorcansmith 0:2a53a4c3238c 824 * The udp pcb is bound to a random local port if not already bound.
lorcansmith 0:2a53a4c3238c 825 *
lorcansmith 0:2a53a4c3238c 826 * @see udp_disconnect()
lorcansmith 0:2a53a4c3238c 827 */
lorcansmith 0:2a53a4c3238c 828 err_t
lorcansmith 0:2a53a4c3238c 829 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
lorcansmith 0:2a53a4c3238c 830 {
lorcansmith 0:2a53a4c3238c 831 struct udp_pcb *ipcb;
lorcansmith 0:2a53a4c3238c 832
lorcansmith 0:2a53a4c3238c 833 if (pcb->local_port == 0) {
lorcansmith 0:2a53a4c3238c 834 printf("Bind to local port: %d\r\n", pcb->local_port); // v0.1 DEBUG
lorcansmith 0:2a53a4c3238c 835 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
lorcansmith 0:2a53a4c3238c 836 if (err != ERR_OK) {
lorcansmith 0:2a53a4c3238c 837 return err;
lorcansmith 0:2a53a4c3238c 838 }
lorcansmith 0:2a53a4c3238c 839 }
lorcansmith 0:2a53a4c3238c 840
lorcansmith 0:2a53a4c3238c 841 ip_addr_set(&pcb->remote_ip, ipaddr);
lorcansmith 0:2a53a4c3238c 842 pcb->remote_port = port;
lorcansmith 0:2a53a4c3238c 843 pcb->flags |= UDP_FLAGS_CONNECTED;
lorcansmith 0:2a53a4c3238c 844 printf("Remote port: %d and flags %d\r\n", pcb->remote_port, pcb->flags); // v0.1 DEBUG
lorcansmith 0:2a53a4c3238c 845 /** TODO: this functionality belongs in upper layers */
lorcansmith 0:2a53a4c3238c 846 #ifdef LWIP_UDP_TODO
lorcansmith 0:2a53a4c3238c 847 /* Nail down local IP for netconn_addr()/getsockname() */
lorcansmith 0:2a53a4c3238c 848 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
lorcansmith 0:2a53a4c3238c 849 struct netif *netif;
lorcansmith 0:2a53a4c3238c 850
lorcansmith 0:2a53a4c3238c 851 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
lorcansmith 0:2a53a4c3238c 852 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
lorcansmith 0:2a53a4c3238c 853 UDP_STATS_INC(udp.rterr);
lorcansmith 0:2a53a4c3238c 854 return ERR_RTE;
lorcansmith 0:2a53a4c3238c 855 }
lorcansmith 0:2a53a4c3238c 856 /** TODO: this will bind the udp pcb locally, to the interface which
lorcansmith 0:2a53a4c3238c 857 is used to route output packets to the remote address. However, we
lorcansmith 0:2a53a4c3238c 858 might want to accept incoming packets on any interface! */
lorcansmith 0:2a53a4c3238c 859 pcb->local_ip = netif->ip_addr;
lorcansmith 0:2a53a4c3238c 860 } else if (ip_addr_isany(&pcb->remote_ip)) {
lorcansmith 0:2a53a4c3238c 861 pcb->local_ip.addr = 0;
lorcansmith 0:2a53a4c3238c 862 }
lorcansmith 0:2a53a4c3238c 863 #endif
lorcansmith 0:2a53a4c3238c 864 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
lorcansmith 0:2a53a4c3238c 865 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
lorcansmith 0:2a53a4c3238c 866 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
lorcansmith 0:2a53a4c3238c 867 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
lorcansmith 0:2a53a4c3238c 868 pcb->local_port));
lorcansmith 0:2a53a4c3238c 869 printf("udp_connect: connected to %d.%d.%d.%d, port %d\r\n",
lorcansmith 0:2a53a4c3238c 870 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
lorcansmith 0:2a53a4c3238c 871 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
lorcansmith 0:2a53a4c3238c 872 pcb->local_port);
lorcansmith 0:2a53a4c3238c 873
lorcansmith 0:2a53a4c3238c 874 /* Insert UDP PCB into the list of active UDP PCBs. */
lorcansmith 0:2a53a4c3238c 875 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
lorcansmith 0:2a53a4c3238c 876 if (pcb == ipcb) {
lorcansmith 0:2a53a4c3238c 877 /* already on the list, just return */
lorcansmith 0:2a53a4c3238c 878 return ERR_OK;
lorcansmith 0:2a53a4c3238c 879 }
lorcansmith 0:2a53a4c3238c 880 }
lorcansmith 0:2a53a4c3238c 881 /* PCB not yet on the list, add PCB now */
lorcansmith 0:2a53a4c3238c 882 pcb->next = udp_pcbs;
lorcansmith 0:2a53a4c3238c 883 udp_pcbs = pcb;
lorcansmith 0:2a53a4c3238c 884 return ERR_OK;
lorcansmith 0:2a53a4c3238c 885 }
lorcansmith 0:2a53a4c3238c 886
lorcansmith 0:2a53a4c3238c 887 /**
lorcansmith 0:2a53a4c3238c 888 * Disconnect a UDP PCB
lorcansmith 0:2a53a4c3238c 889 *
lorcansmith 0:2a53a4c3238c 890 * @param pcb the udp pcb to disconnect.
lorcansmith 0:2a53a4c3238c 891 */
lorcansmith 0:2a53a4c3238c 892 void
lorcansmith 0:2a53a4c3238c 893 udp_disconnect(struct udp_pcb *pcb)
lorcansmith 0:2a53a4c3238c 894 {
lorcansmith 0:2a53a4c3238c 895 /* reset remote address association */
lorcansmith 0:2a53a4c3238c 896 ip_addr_set_any(&pcb->remote_ip);
lorcansmith 0:2a53a4c3238c 897 pcb->remote_port = 0;
lorcansmith 0:2a53a4c3238c 898 /* mark PCB as unconnected */
lorcansmith 0:2a53a4c3238c 899 pcb->flags &= ~UDP_FLAGS_CONNECTED;
lorcansmith 0:2a53a4c3238c 900 }
lorcansmith 0:2a53a4c3238c 901
lorcansmith 0:2a53a4c3238c 902 /**
lorcansmith 0:2a53a4c3238c 903 * Set a receive callback for a UDP PCB
lorcansmith 0:2a53a4c3238c 904 *
lorcansmith 0:2a53a4c3238c 905 * This callback will be called when receiving a datagram for the pcb.
lorcansmith 0:2a53a4c3238c 906 *
lorcansmith 0:2a53a4c3238c 907 * @param pcb the pcb for wich to set the recv callback
lorcansmith 0:2a53a4c3238c 908 * @param recv function pointer of the callback function
lorcansmith 0:2a53a4c3238c 909 * @param recv_arg additional argument to pass to the callback function
lorcansmith 0:2a53a4c3238c 910 */
lorcansmith 0:2a53a4c3238c 911 void
lorcansmith 0:2a53a4c3238c 912 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
lorcansmith 0:2a53a4c3238c 913 {
lorcansmith 0:2a53a4c3238c 914 /* remember recv() callback and user data */
lorcansmith 0:2a53a4c3238c 915 pcb->recv = recv;
lorcansmith 0:2a53a4c3238c 916 pcb->recv_arg = recv_arg;
lorcansmith 0:2a53a4c3238c 917 }
lorcansmith 0:2a53a4c3238c 918
lorcansmith 0:2a53a4c3238c 919 /**
lorcansmith 0:2a53a4c3238c 920 * Remove an UDP PCB.
lorcansmith 0:2a53a4c3238c 921 *
lorcansmith 0:2a53a4c3238c 922 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
lorcansmith 0:2a53a4c3238c 923 * UDP PCB's and the data structure is freed from memory.
lorcansmith 0:2a53a4c3238c 924 *
lorcansmith 0:2a53a4c3238c 925 * @see udp_new()
lorcansmith 0:2a53a4c3238c 926 */
lorcansmith 0:2a53a4c3238c 927 void
lorcansmith 0:2a53a4c3238c 928 udp_remove(struct udp_pcb *pcb)
lorcansmith 0:2a53a4c3238c 929 {
lorcansmith 0:2a53a4c3238c 930 struct udp_pcb *pcb2;
lorcansmith 0:2a53a4c3238c 931
lorcansmith 0:2a53a4c3238c 932 snmp_delete_udpidx_tree(pcb);
lorcansmith 0:2a53a4c3238c 933 /* pcb to be removed is first in list? */
lorcansmith 0:2a53a4c3238c 934 if (udp_pcbs == pcb) {
lorcansmith 0:2a53a4c3238c 935 /* make list start at 2nd pcb */
lorcansmith 0:2a53a4c3238c 936 udp_pcbs = udp_pcbs->next;
lorcansmith 0:2a53a4c3238c 937 /* pcb not 1st in list */
lorcansmith 0:2a53a4c3238c 938 } else {
lorcansmith 0:2a53a4c3238c 939 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
lorcansmith 0:2a53a4c3238c 940 /* find pcb in udp_pcbs list */
lorcansmith 0:2a53a4c3238c 941 if (pcb2->next != NULL && pcb2->next == pcb) {
lorcansmith 0:2a53a4c3238c 942 /* remove pcb from list */
lorcansmith 0:2a53a4c3238c 943 pcb2->next = pcb->next;
lorcansmith 0:2a53a4c3238c 944 }
lorcansmith 0:2a53a4c3238c 945 }
lorcansmith 0:2a53a4c3238c 946 }
lorcansmith 0:2a53a4c3238c 947 memp_free(MEMP_UDP_PCB, pcb);
lorcansmith 0:2a53a4c3238c 948 }
lorcansmith 0:2a53a4c3238c 949
lorcansmith 0:2a53a4c3238c 950 /**
lorcansmith 0:2a53a4c3238c 951 * Create a UDP PCB.
lorcansmith 0:2a53a4c3238c 952 *
lorcansmith 0:2a53a4c3238c 953 * @return The UDP PCB which was created. NULL if the PCB data structure
lorcansmith 0:2a53a4c3238c 954 * could not be allocated.
lorcansmith 0:2a53a4c3238c 955 *
lorcansmith 0:2a53a4c3238c 956 * @see udp_remove()
lorcansmith 0:2a53a4c3238c 957 */
lorcansmith 0:2a53a4c3238c 958 struct udp_pcb *
lorcansmith 0:2a53a4c3238c 959 udp_new(void)
lorcansmith 0:2a53a4c3238c 960 {
lorcansmith 0:2a53a4c3238c 961 struct udp_pcb *pcb;
lorcansmith 0:2a53a4c3238c 962 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
lorcansmith 0:2a53a4c3238c 963 /* could allocate UDP PCB? */
lorcansmith 0:2a53a4c3238c 964 if (pcb != NULL) {
lorcansmith 0:2a53a4c3238c 965 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
lorcansmith 0:2a53a4c3238c 966 * which means checksum is generated over the whole datagram per default
lorcansmith 0:2a53a4c3238c 967 * (recommended as default by RFC 3828). */
lorcansmith 0:2a53a4c3238c 968 /* initialize PCB to all zeroes */
lorcansmith 0:2a53a4c3238c 969 memset(pcb, 0, sizeof(struct udp_pcb));
lorcansmith 0:2a53a4c3238c 970 pcb->ttl = UDP_TTL;
lorcansmith 0:2a53a4c3238c 971 }
lorcansmith 0:2a53a4c3238c 972 return pcb;
lorcansmith 0:2a53a4c3238c 973 }
lorcansmith 0:2a53a4c3238c 974
lorcansmith 0:2a53a4c3238c 975 #if UDP_DEBUG
lorcansmith 0:2a53a4c3238c 976 /**
lorcansmith 0:2a53a4c3238c 977 * Print UDP header information for debug purposes.
lorcansmith 0:2a53a4c3238c 978 *
lorcansmith 0:2a53a4c3238c 979 * @param udphdr pointer to the udp header in memory.
lorcansmith 0:2a53a4c3238c 980 */
lorcansmith 0:2a53a4c3238c 981 void
lorcansmith 0:2a53a4c3238c 982 udp_debug_print(struct udp_hdr *udphdr)
lorcansmith 0:2a53a4c3238c 983 {
lorcansmith 0:2a53a4c3238c 984 printf("UDP header:\r\n");
lorcansmith 0:2a53a4c3238c 985 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
lorcansmith 0:2a53a4c3238c 986 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 987 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
lorcansmith 0:2a53a4c3238c 988 ntohs(udphdr->src), ntohs(udphdr->dest)));
lorcansmith 0:2a53a4c3238c 989 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 990 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
lorcansmith 0:2a53a4c3238c 991 ntohs(udphdr->len), ntohs(udphdr->chksum)));
lorcansmith 0:2a53a4c3238c 992 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
lorcansmith 0:2a53a4c3238c 993 }
lorcansmith 0:2a53a4c3238c 994 #endif /* UDP_DEBUG */
lorcansmith 0:2a53a4c3238c 995
lorcansmith 0:2a53a4c3238c 996 #endif /* LWIP_UDP */