Yasushi TAUCHI / Mbed 2 deprecated giken9_HTMLServer_Sample

ソースの整理中ですが、利用はできます。

Dependencies:   EthernetInterface HttpServer TextLCD mbed-rpc mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/core/udp.c@0:7766f6712673, 2014-03-12 (annotated)

Committer:
yueee_yt
Date:
Wed Mar 12 04:19:54 2014 +0000
Revision:
0:7766f6712673
???????????????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yueee_yt 0:7766f6712673 1 /**
yueee_yt 0:7766f6712673 2 * @file
yueee_yt 0:7766f6712673 3 * User Datagram Protocol module
yueee_yt 0:7766f6712673 4 *
yueee_yt 0:7766f6712673 5 */
yueee_yt 0:7766f6712673 6
yueee_yt 0:7766f6712673 7 /*
yueee_yt 0:7766f6712673 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
yueee_yt 0:7766f6712673 9 * All rights reserved.
yueee_yt 0:7766f6712673 10 *
yueee_yt 0:7766f6712673 11 * Redistribution and use in source and binary forms, with or without modification,
yueee_yt 0:7766f6712673 12 * are permitted provided that the following conditions are met:
yueee_yt 0:7766f6712673 13 *
yueee_yt 0:7766f6712673 14 * 1. Redistributions of source code must retain the above copyright notice,
yueee_yt 0:7766f6712673 15 * this list of conditions and the following disclaimer.
yueee_yt 0:7766f6712673 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
yueee_yt 0:7766f6712673 17 * this list of conditions and the following disclaimer in the documentation
yueee_yt 0:7766f6712673 18 * and/or other materials provided with the distribution.
yueee_yt 0:7766f6712673 19 * 3. The name of the author may not be used to endorse or promote products
yueee_yt 0:7766f6712673 20 * derived from this software without specific prior written permission.
yueee_yt 0:7766f6712673 21 *
yueee_yt 0:7766f6712673 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
yueee_yt 0:7766f6712673 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
yueee_yt 0:7766f6712673 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
yueee_yt 0:7766f6712673 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
yueee_yt 0:7766f6712673 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
yueee_yt 0:7766f6712673 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
yueee_yt 0:7766f6712673 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
yueee_yt 0:7766f6712673 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
yueee_yt 0:7766f6712673 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
yueee_yt 0:7766f6712673 31 * OF SUCH DAMAGE.
yueee_yt 0:7766f6712673 32 *
yueee_yt 0:7766f6712673 33 * This file is part of the lwIP TCP/IP stack.
yueee_yt 0:7766f6712673 34 *
yueee_yt 0:7766f6712673 35 * Author: Adam Dunkels <adam@sics.se>
yueee_yt 0:7766f6712673 36 *
yueee_yt 0:7766f6712673 37 */
yueee_yt 0:7766f6712673 38
yueee_yt 0:7766f6712673 39
yueee_yt 0:7766f6712673 40 /* udp.c
yueee_yt 0:7766f6712673 41 *
yueee_yt 0:7766f6712673 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
yueee_yt 0:7766f6712673 43 *
yueee_yt 0:7766f6712673 44 */
yueee_yt 0:7766f6712673 45
yueee_yt 0:7766f6712673 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
yueee_yt 0:7766f6712673 47 */
yueee_yt 0:7766f6712673 48
yueee_yt 0:7766f6712673 49 #include "lwip/opt.h"
yueee_yt 0:7766f6712673 50
yueee_yt 0:7766f6712673 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
yueee_yt 0:7766f6712673 52
yueee_yt 0:7766f6712673 53 #include "lwip/udp.h"
yueee_yt 0:7766f6712673 54 #include "lwip/def.h"
yueee_yt 0:7766f6712673 55 #include "lwip/memp.h"
yueee_yt 0:7766f6712673 56 #include "lwip/inet_chksum.h"
yueee_yt 0:7766f6712673 57 #include "lwip/ip_addr.h"
yueee_yt 0:7766f6712673 58 #include "lwip/netif.h"
yueee_yt 0:7766f6712673 59 #include "lwip/icmp.h"
yueee_yt 0:7766f6712673 60 #include "lwip/stats.h"
yueee_yt 0:7766f6712673 61 #include "lwip/snmp.h"
yueee_yt 0:7766f6712673 62 #include "arch/perf.h"
yueee_yt 0:7766f6712673 63 #include "lwip/dhcp.h"
yueee_yt 0:7766f6712673 64
yueee_yt 0:7766f6712673 65 #include <string.h>
yueee_yt 0:7766f6712673 66
yueee_yt 0:7766f6712673 67 /* The list of UDP PCBs */
yueee_yt 0:7766f6712673 68 /* exported in udp.h (was static) */
yueee_yt 0:7766f6712673 69 struct udp_pcb *udp_pcbs;
yueee_yt 0:7766f6712673 70
yueee_yt 0:7766f6712673 71 /**
yueee_yt 0:7766f6712673 72 * Process an incoming UDP datagram.
yueee_yt 0:7766f6712673 73 *
yueee_yt 0:7766f6712673 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
yueee_yt 0:7766f6712673 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
yueee_yt 0:7766f6712673 76 * recv function. If no pcb is found or the datagram is incorrect, the
yueee_yt 0:7766f6712673 77 * pbuf is freed.
yueee_yt 0:7766f6712673 78 *
yueee_yt 0:7766f6712673 79 * @param p pbuf to be demultiplexed to a UDP PCB.
yueee_yt 0:7766f6712673 80 * @param inp network interface on which the datagram was received.
yueee_yt 0:7766f6712673 81 *
yueee_yt 0:7766f6712673 82 */
yueee_yt 0:7766f6712673 83 void
yueee_yt 0:7766f6712673 84 udp_input(struct pbuf *p, struct netif *inp)
yueee_yt 0:7766f6712673 85 {
yueee_yt 0:7766f6712673 86 struct udp_hdr *udphdr;
yueee_yt 0:7766f6712673 87 struct udp_pcb *pcb, *prev;
yueee_yt 0:7766f6712673 88 struct udp_pcb *uncon_pcb;
yueee_yt 0:7766f6712673 89 struct ip_hdr *iphdr;
yueee_yt 0:7766f6712673 90 u16_t src, dest;
yueee_yt 0:7766f6712673 91 u8_t local_match;
yueee_yt 0:7766f6712673 92 u8_t broadcast;
yueee_yt 0:7766f6712673 93
yueee_yt 0:7766f6712673 94 PERF_START;
yueee_yt 0:7766f6712673 95
yueee_yt 0:7766f6712673 96 UDP_STATS_INC(udp.recv);
yueee_yt 0:7766f6712673 97
yueee_yt 0:7766f6712673 98 iphdr = (struct ip_hdr *)p->payload;
yueee_yt 0:7766f6712673 99
yueee_yt 0:7766f6712673 100 /* Check minimum length (IP header + UDP header)
yueee_yt 0:7766f6712673 101 * and move payload pointer to UDP header */
yueee_yt 0:7766f6712673 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
yueee_yt 0:7766f6712673 103 /* drop short packets */
yueee_yt 0:7766f6712673 104 LWIP_DEBUGF(UDP_DEBUG,
yueee_yt 0:7766f6712673 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
yueee_yt 0:7766f6712673 106 UDP_STATS_INC(udp.lenerr);
yueee_yt 0:7766f6712673 107 UDP_STATS_INC(udp.drop);
yueee_yt 0:7766f6712673 108 snmp_inc_udpinerrors();
yueee_yt 0:7766f6712673 109 pbuf_free(p);
yueee_yt 0:7766f6712673 110 goto end;
yueee_yt 0:7766f6712673 111 }
yueee_yt 0:7766f6712673 112
yueee_yt 0:7766f6712673 113 udphdr = (struct udp_hdr *)p->payload;
yueee_yt 0:7766f6712673 114
yueee_yt 0:7766f6712673 115 /* is broadcast packet ? */
yueee_yt 0:7766f6712673 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
yueee_yt 0:7766f6712673 117
yueee_yt 0:7766f6712673 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
yueee_yt 0:7766f6712673 119
yueee_yt 0:7766f6712673 120 /* convert src and dest ports to host byte order */
yueee_yt 0:7766f6712673 121 src = ntohs(udphdr->src);
yueee_yt 0:7766f6712673 122 dest = ntohs(udphdr->dest);
yueee_yt 0:7766f6712673 123
yueee_yt 0:7766f6712673 124 udp_debug_print(udphdr);
yueee_yt 0:7766f6712673 125
yueee_yt 0:7766f6712673 126 /* print the UDP source and destination */
yueee_yt 0:7766f6712673 127 LWIP_DEBUGF(UDP_DEBUG,
yueee_yt 0:7766f6712673 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
yueee_yt 0:7766f6712673 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
yueee_yt 0:7766f6712673 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
yueee_yt 0:7766f6712673 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
yueee_yt 0:7766f6712673 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
yueee_yt 0:7766f6712673 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
yueee_yt 0:7766f6712673 134
yueee_yt 0:7766f6712673 135 #if LWIP_DHCP
yueee_yt 0:7766f6712673 136 pcb = NULL;
yueee_yt 0:7766f6712673 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
yueee_yt 0:7766f6712673 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
yueee_yt 0:7766f6712673 139 if (dest == DHCP_CLIENT_PORT) {
yueee_yt 0:7766f6712673 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
yueee_yt 0:7766f6712673 141 if (src == DHCP_SERVER_PORT) {
yueee_yt 0:7766f6712673 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
yueee_yt 0:7766f6712673 143 /* accept the packe if
yueee_yt 0:7766f6712673 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
yueee_yt 0:7766f6712673 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
yueee_yt 0:7766f6712673 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
yueee_yt 0:7766f6712673 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
yueee_yt 0:7766f6712673 148 pcb = inp->dhcp->pcb;
yueee_yt 0:7766f6712673 149 }
yueee_yt 0:7766f6712673 150 }
yueee_yt 0:7766f6712673 151 }
yueee_yt 0:7766f6712673 152 } else
yueee_yt 0:7766f6712673 153 #endif /* LWIP_DHCP */
yueee_yt 0:7766f6712673 154 {
yueee_yt 0:7766f6712673 155 prev = NULL;
yueee_yt 0:7766f6712673 156 local_match = 0;
yueee_yt 0:7766f6712673 157 uncon_pcb = NULL;
yueee_yt 0:7766f6712673 158 /* Iterate through the UDP pcb list for a matching pcb.
yueee_yt 0:7766f6712673 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
yueee_yt 0:7766f6712673 160 * preferred. If no perfect match is found, the first unconnected pcb that
yueee_yt 0:7766f6712673 161 * matches the local port and ip address gets the datagram. */
yueee_yt 0:7766f6712673 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
yueee_yt 0:7766f6712673 163 local_match = 0;
yueee_yt 0:7766f6712673 164 /* print the PCB local and remote address */
yueee_yt 0:7766f6712673 165 LWIP_DEBUGF(UDP_DEBUG,
yueee_yt 0:7766f6712673 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
yueee_yt 0:7766f6712673 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
yueee_yt 0:7766f6712673 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
yueee_yt 0:7766f6712673 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
yueee_yt 0:7766f6712673 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
yueee_yt 0:7766f6712673 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
yueee_yt 0:7766f6712673 172
yueee_yt 0:7766f6712673 173 /* compare PCB local addr+port to UDP destination addr+port */
yueee_yt 0:7766f6712673 174 if ((pcb->local_port == dest) &&
yueee_yt 0:7766f6712673 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
yueee_yt 0:7766f6712673 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
yueee_yt 0:7766f6712673 177 #if LWIP_IGMP
yueee_yt 0:7766f6712673 178 ip_addr_ismulticast(&current_iphdr_dest) ||
yueee_yt 0:7766f6712673 179 #endif /* LWIP_IGMP */
yueee_yt 0:7766f6712673 180 #if IP_SOF_BROADCAST_RECV
yueee_yt 0:7766f6712673 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
yueee_yt 0:7766f6712673 182 #else /* IP_SOF_BROADCAST_RECV */
yueee_yt 0:7766f6712673 183 (broadcast))) {
yueee_yt 0:7766f6712673 184 #endif /* IP_SOF_BROADCAST_RECV */
yueee_yt 0:7766f6712673 185 local_match = 1;
yueee_yt 0:7766f6712673 186 if ((uncon_pcb == NULL) &&
yueee_yt 0:7766f6712673 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
yueee_yt 0:7766f6712673 188 /* the first unconnected matching PCB */
yueee_yt 0:7766f6712673 189 uncon_pcb = pcb;
yueee_yt 0:7766f6712673 190 }
yueee_yt 0:7766f6712673 191 }
yueee_yt 0:7766f6712673 192 /* compare PCB remote addr+port to UDP source addr+port */
yueee_yt 0:7766f6712673 193 if ((local_match != 0) &&
yueee_yt 0:7766f6712673 194 (pcb->remote_port == src) &&
yueee_yt 0:7766f6712673 195 (ip_addr_isany(&pcb->remote_ip) ||
yueee_yt 0:7766f6712673 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
yueee_yt 0:7766f6712673 197 /* the first fully matching PCB */
yueee_yt 0:7766f6712673 198 if (prev != NULL) {
yueee_yt 0:7766f6712673 199 /* move the pcb to the front of udp_pcbs so that is
yueee_yt 0:7766f6712673 200 found faster next time */
yueee_yt 0:7766f6712673 201 prev->next = pcb->next;
yueee_yt 0:7766f6712673 202 pcb->next = udp_pcbs;
yueee_yt 0:7766f6712673 203 udp_pcbs = pcb;
yueee_yt 0:7766f6712673 204 } else {
yueee_yt 0:7766f6712673 205 UDP_STATS_INC(udp.cachehit);
yueee_yt 0:7766f6712673 206 }
yueee_yt 0:7766f6712673 207 break;
yueee_yt 0:7766f6712673 208 }
yueee_yt 0:7766f6712673 209 prev = pcb;
yueee_yt 0:7766f6712673 210 }
yueee_yt 0:7766f6712673 211 /* no fully matching pcb found? then look for an unconnected pcb */
yueee_yt 0:7766f6712673 212 if (pcb == NULL) {
yueee_yt 0:7766f6712673 213 pcb = uncon_pcb;
yueee_yt 0:7766f6712673 214 }
yueee_yt 0:7766f6712673 215 }
yueee_yt 0:7766f6712673 216
yueee_yt 0:7766f6712673 217 /* Check checksum if this is a match or if it was directed at us. */
yueee_yt 0:7766f6712673 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
yueee_yt 0:7766f6712673 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
yueee_yt 0:7766f6712673 220 #if LWIP_UDPLITE
yueee_yt 0:7766f6712673 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
yueee_yt 0:7766f6712673 222 /* Do the UDP Lite checksum */
yueee_yt 0:7766f6712673 223 #if CHECKSUM_CHECK_UDP
yueee_yt 0:7766f6712673 224 u16_t chklen = ntohs(udphdr->len);
yueee_yt 0:7766f6712673 225 if (chklen < sizeof(struct udp_hdr)) {
yueee_yt 0:7766f6712673 226 if (chklen == 0) {
yueee_yt 0:7766f6712673 227 /* For UDP-Lite, checksum length of 0 means checksum
yueee_yt 0:7766f6712673 228 over the complete packet (See RFC 3828 chap. 3.1) */
yueee_yt 0:7766f6712673 229 chklen = p->tot_len;
yueee_yt 0:7766f6712673 230 } else {
yueee_yt 0:7766f6712673 231 /* At least the UDP-Lite header must be covered by the
yueee_yt 0:7766f6712673 232 checksum! (Again, see RFC 3828 chap. 3.1) */
yueee_yt 0:7766f6712673 233 UDP_STATS_INC(udp.chkerr);
yueee_yt 0:7766f6712673 234 UDP_STATS_INC(udp.drop);
yueee_yt 0:7766f6712673 235 snmp_inc_udpinerrors();
yueee_yt 0:7766f6712673 236 pbuf_free(p);
yueee_yt 0:7766f6712673 237 goto end;
yueee_yt 0:7766f6712673 238 }
yueee_yt 0:7766f6712673 239 }
yueee_yt 0:7766f6712673 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
yueee_yt 0:7766f6712673 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
yueee_yt 0:7766f6712673 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
yueee_yt 0:7766f6712673 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
yueee_yt 0:7766f6712673 244 UDP_STATS_INC(udp.chkerr);
yueee_yt 0:7766f6712673 245 UDP_STATS_INC(udp.drop);
yueee_yt 0:7766f6712673 246 snmp_inc_udpinerrors();
yueee_yt 0:7766f6712673 247 pbuf_free(p);
yueee_yt 0:7766f6712673 248 goto end;
yueee_yt 0:7766f6712673 249 }
yueee_yt 0:7766f6712673 250 #endif /* CHECKSUM_CHECK_UDP */
yueee_yt 0:7766f6712673 251 } else
yueee_yt 0:7766f6712673 252 #endif /* LWIP_UDPLITE */
yueee_yt 0:7766f6712673 253 {
yueee_yt 0:7766f6712673 254 #if CHECKSUM_CHECK_UDP
yueee_yt 0:7766f6712673 255 if (udphdr->chksum != 0) {
yueee_yt 0:7766f6712673 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
yueee_yt 0:7766f6712673 257 IP_PROTO_UDP, p->tot_len) != 0) {
yueee_yt 0:7766f6712673 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
yueee_yt 0:7766f6712673 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
yueee_yt 0:7766f6712673 260 UDP_STATS_INC(udp.chkerr);
yueee_yt 0:7766f6712673 261 UDP_STATS_INC(udp.drop);
yueee_yt 0:7766f6712673 262 snmp_inc_udpinerrors();
yueee_yt 0:7766f6712673 263 pbuf_free(p);
yueee_yt 0:7766f6712673 264 goto end;
yueee_yt 0:7766f6712673 265 }
yueee_yt 0:7766f6712673 266 }
yueee_yt 0:7766f6712673 267 #endif /* CHECKSUM_CHECK_UDP */
yueee_yt 0:7766f6712673 268 }
yueee_yt 0:7766f6712673 269 if(pbuf_header(p, -UDP_HLEN)) {
yueee_yt 0:7766f6712673 270 /* Can we cope with this failing? Just assert for now */
yueee_yt 0:7766f6712673 271 LWIP_ASSERT("pbuf_header failed\n", 0);
yueee_yt 0:7766f6712673 272 UDP_STATS_INC(udp.drop);
yueee_yt 0:7766f6712673 273 snmp_inc_udpinerrors();
yueee_yt 0:7766f6712673 274 pbuf_free(p);
yueee_yt 0:7766f6712673 275 goto end;
yueee_yt 0:7766f6712673 276 }
yueee_yt 0:7766f6712673 277 if (pcb != NULL) {
yueee_yt 0:7766f6712673 278 snmp_inc_udpindatagrams();
yueee_yt 0:7766f6712673 279 #if SO_REUSE && SO_REUSE_RXTOALL
yueee_yt 0:7766f6712673 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
yueee_yt 0:7766f6712673 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
yueee_yt 0:7766f6712673 282 /* pass broadcast- or multicast packets to all multicast pcbs
yueee_yt 0:7766f6712673 283 if SOF_REUSEADDR is set on the first match */
yueee_yt 0:7766f6712673 284 struct udp_pcb *mpcb;
yueee_yt 0:7766f6712673 285 u8_t p_header_changed = 0;
yueee_yt 0:7766f6712673 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
yueee_yt 0:7766f6712673 287 if (mpcb != pcb) {
yueee_yt 0:7766f6712673 288 /* compare PCB local addr+port to UDP destination addr+port */
yueee_yt 0:7766f6712673 289 if ((mpcb->local_port == dest) &&
yueee_yt 0:7766f6712673 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
yueee_yt 0:7766f6712673 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
yueee_yt 0:7766f6712673 292 #if LWIP_IGMP
yueee_yt 0:7766f6712673 293 ip_addr_ismulticast(&current_iphdr_dest) ||
yueee_yt 0:7766f6712673 294 #endif /* LWIP_IGMP */
yueee_yt 0:7766f6712673 295 #if IP_SOF_BROADCAST_RECV
yueee_yt 0:7766f6712673 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
yueee_yt 0:7766f6712673 297 #else /* IP_SOF_BROADCAST_RECV */
yueee_yt 0:7766f6712673 298 (broadcast))) {
yueee_yt 0:7766f6712673 299 #endif /* IP_SOF_BROADCAST_RECV */
yueee_yt 0:7766f6712673 300 /* pass a copy of the packet to all local matches */
yueee_yt 0:7766f6712673 301 if (mpcb->recv != NULL) {
yueee_yt 0:7766f6712673 302 struct pbuf *q;
yueee_yt 0:7766f6712673 303 /* for that, move payload to IP header again */
yueee_yt 0:7766f6712673 304 if (p_header_changed == 0) {
yueee_yt 0:7766f6712673 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
yueee_yt 0:7766f6712673 306 p_header_changed = 1;
yueee_yt 0:7766f6712673 307 }
yueee_yt 0:7766f6712673 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
yueee_yt 0:7766f6712673 309 if (q != NULL) {
yueee_yt 0:7766f6712673 310 err_t err = pbuf_copy(q, p);
yueee_yt 0:7766f6712673 311 if (err == ERR_OK) {
yueee_yt 0:7766f6712673 312 /* move payload to UDP data */
yueee_yt 0:7766f6712673 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
yueee_yt 0:7766f6712673 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
yueee_yt 0:7766f6712673 315 }
yueee_yt 0:7766f6712673 316 }
yueee_yt 0:7766f6712673 317 }
yueee_yt 0:7766f6712673 318 }
yueee_yt 0:7766f6712673 319 }
yueee_yt 0:7766f6712673 320 }
yueee_yt 0:7766f6712673 321 if (p_header_changed) {
yueee_yt 0:7766f6712673 322 /* and move payload to UDP data again */
yueee_yt 0:7766f6712673 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
yueee_yt 0:7766f6712673 324 }
yueee_yt 0:7766f6712673 325 }
yueee_yt 0:7766f6712673 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
yueee_yt 0:7766f6712673 327 /* callback */
yueee_yt 0:7766f6712673 328 if (pcb->recv != NULL) {
yueee_yt 0:7766f6712673 329 /* now the recv function is responsible for freeing p */
yueee_yt 0:7766f6712673 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
yueee_yt 0:7766f6712673 331 } else {
yueee_yt 0:7766f6712673 332 /* no recv function registered? then we have to free the pbuf! */
yueee_yt 0:7766f6712673 333 pbuf_free(p);
yueee_yt 0:7766f6712673 334 goto end;
yueee_yt 0:7766f6712673 335 }
yueee_yt 0:7766f6712673 336 } else {
yueee_yt 0:7766f6712673 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
yueee_yt 0:7766f6712673 338
yueee_yt 0:7766f6712673 339 #if LWIP_ICMP
yueee_yt 0:7766f6712673 340 /* No match was found, send ICMP destination port unreachable unless
yueee_yt 0:7766f6712673 341 destination address was broadcast/multicast. */
yueee_yt 0:7766f6712673 342 if (!broadcast &&
yueee_yt 0:7766f6712673 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
yueee_yt 0:7766f6712673 344 /* move payload pointer back to ip header */
yueee_yt 0:7766f6712673 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
yueee_yt 0:7766f6712673 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
yueee_yt 0:7766f6712673 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
yueee_yt 0:7766f6712673 348 }
yueee_yt 0:7766f6712673 349 #endif /* LWIP_ICMP */
yueee_yt 0:7766f6712673 350 UDP_STATS_INC(udp.proterr);
yueee_yt 0:7766f6712673 351 UDP_STATS_INC(udp.drop);
yueee_yt 0:7766f6712673 352 snmp_inc_udpnoports();
yueee_yt 0:7766f6712673 353 pbuf_free(p);
yueee_yt 0:7766f6712673 354 }
yueee_yt 0:7766f6712673 355 } else {
yueee_yt 0:7766f6712673 356 pbuf_free(p);
yueee_yt 0:7766f6712673 357 }
yueee_yt 0:7766f6712673 358 end:
yueee_yt 0:7766f6712673 359 PERF_STOP("udp_input");
yueee_yt 0:7766f6712673 360 }
yueee_yt 0:7766f6712673 361
yueee_yt 0:7766f6712673 362 /**
yueee_yt 0:7766f6712673 363 * Send data using UDP.
yueee_yt 0:7766f6712673 364 *
yueee_yt 0:7766f6712673 365 * @param pcb UDP PCB used to send the data.
yueee_yt 0:7766f6712673 366 * @param p chain of pbuf's to be sent.
yueee_yt 0:7766f6712673 367 *
yueee_yt 0:7766f6712673 368 * The datagram will be sent to the current remote_ip & remote_port
yueee_yt 0:7766f6712673 369 * stored in pcb. If the pcb is not bound to a port, it will
yueee_yt 0:7766f6712673 370 * automatically be bound to a random port.
yueee_yt 0:7766f6712673 371 *
yueee_yt 0:7766f6712673 372 * @return lwIP error code.
yueee_yt 0:7766f6712673 373 * - ERR_OK. Successful. No error occured.
yueee_yt 0:7766f6712673 374 * - ERR_MEM. Out of memory.
yueee_yt 0:7766f6712673 375 * - ERR_RTE. Could not find route to destination address.
yueee_yt 0:7766f6712673 376 * - More errors could be returned by lower protocol layers.
yueee_yt 0:7766f6712673 377 *
yueee_yt 0:7766f6712673 378 * @see udp_disconnect() udp_sendto()
yueee_yt 0:7766f6712673 379 */
yueee_yt 0:7766f6712673 380 err_t
yueee_yt 0:7766f6712673 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
yueee_yt 0:7766f6712673 382 {
yueee_yt 0:7766f6712673 383 /* send to the packet using remote ip and port stored in the pcb */
yueee_yt 0:7766f6712673 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
yueee_yt 0:7766f6712673 385 }
yueee_yt 0:7766f6712673 386
yueee_yt 0:7766f6712673 387 #if LWIP_CHECKSUM_ON_COPY
yueee_yt 0:7766f6712673 388 /** Same as udp_send() but with checksum
yueee_yt 0:7766f6712673 389 */
yueee_yt 0:7766f6712673 390 err_t
yueee_yt 0:7766f6712673 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
yueee_yt 0:7766f6712673 392 u8_t have_chksum, u16_t chksum)
yueee_yt 0:7766f6712673 393 {
yueee_yt 0:7766f6712673 394 /* send to the packet using remote ip and port stored in the pcb */
yueee_yt 0:7766f6712673 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
yueee_yt 0:7766f6712673 396 have_chksum, chksum);
yueee_yt 0:7766f6712673 397 }
yueee_yt 0:7766f6712673 398 #endif /* LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 399
yueee_yt 0:7766f6712673 400 /**
yueee_yt 0:7766f6712673 401 * Send data to a specified address using UDP.
yueee_yt 0:7766f6712673 402 *
yueee_yt 0:7766f6712673 403 * @param pcb UDP PCB used to send the data.
yueee_yt 0:7766f6712673 404 * @param p chain of pbuf's to be sent.
yueee_yt 0:7766f6712673 405 * @param dst_ip Destination IP address.
yueee_yt 0:7766f6712673 406 * @param dst_port Destination UDP port.
yueee_yt 0:7766f6712673 407 *
yueee_yt 0:7766f6712673 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
yueee_yt 0:7766f6712673 409 *
yueee_yt 0:7766f6712673 410 * If the PCB already has a remote address association, it will
yueee_yt 0:7766f6712673 411 * be restored after the data is sent.
yueee_yt 0:7766f6712673 412 *
yueee_yt 0:7766f6712673 413 * @return lwIP error code (@see udp_send for possible error codes)
yueee_yt 0:7766f6712673 414 *
yueee_yt 0:7766f6712673 415 * @see udp_disconnect() udp_send()
yueee_yt 0:7766f6712673 416 */
yueee_yt 0:7766f6712673 417 err_t
yueee_yt 0:7766f6712673 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
yueee_yt 0:7766f6712673 419 ip_addr_t *dst_ip, u16_t dst_port)
yueee_yt 0:7766f6712673 420 {
yueee_yt 0:7766f6712673 421 #if LWIP_CHECKSUM_ON_COPY
yueee_yt 0:7766f6712673 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
yueee_yt 0:7766f6712673 423 }
yueee_yt 0:7766f6712673 424
yueee_yt 0:7766f6712673 425 /** Same as udp_sendto(), but with checksum */
yueee_yt 0:7766f6712673 426 err_t
yueee_yt 0:7766f6712673 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
yueee_yt 0:7766f6712673 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
yueee_yt 0:7766f6712673 429 {
yueee_yt 0:7766f6712673 430 #endif /* LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 431 struct netif *netif;
yueee_yt 0:7766f6712673 432
yueee_yt 0:7766f6712673 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
yueee_yt 0:7766f6712673 434
yueee_yt 0:7766f6712673 435 /* find the outgoing network interface for this packet */
yueee_yt 0:7766f6712673 436 #if LWIP_IGMP
yueee_yt 0:7766f6712673 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
yueee_yt 0:7766f6712673 438 #else
yueee_yt 0:7766f6712673 439 netif = ip_route(dst_ip);
yueee_yt 0:7766f6712673 440 #endif /* LWIP_IGMP */
yueee_yt 0:7766f6712673 441
yueee_yt 0:7766f6712673 442 /* no outgoing network interface could be found? */
yueee_yt 0:7766f6712673 443 if (netif == NULL) {
yueee_yt 0:7766f6712673 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
yueee_yt 0:7766f6712673 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
yueee_yt 0:7766f6712673 446 UDP_STATS_INC(udp.rterr);
yueee_yt 0:7766f6712673 447 return ERR_RTE;
yueee_yt 0:7766f6712673 448 }
yueee_yt 0:7766f6712673 449 #if LWIP_CHECKSUM_ON_COPY
yueee_yt 0:7766f6712673 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
yueee_yt 0:7766f6712673 451 #else /* LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
yueee_yt 0:7766f6712673 453 #endif /* LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 454 }
yueee_yt 0:7766f6712673 455
yueee_yt 0:7766f6712673 456 /**
yueee_yt 0:7766f6712673 457 * Send data to a specified address using UDP.
yueee_yt 0:7766f6712673 458 * The netif used for sending can be specified.
yueee_yt 0:7766f6712673 459 *
yueee_yt 0:7766f6712673 460 * This function exists mainly for DHCP, to be able to send UDP packets
yueee_yt 0:7766f6712673 461 * on a netif that is still down.
yueee_yt 0:7766f6712673 462 *
yueee_yt 0:7766f6712673 463 * @param pcb UDP PCB used to send the data.
yueee_yt 0:7766f6712673 464 * @param p chain of pbuf's to be sent.
yueee_yt 0:7766f6712673 465 * @param dst_ip Destination IP address.
yueee_yt 0:7766f6712673 466 * @param dst_port Destination UDP port.
yueee_yt 0:7766f6712673 467 * @param netif the netif used for sending.
yueee_yt 0:7766f6712673 468 *
yueee_yt 0:7766f6712673 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
yueee_yt 0:7766f6712673 470 *
yueee_yt 0:7766f6712673 471 * @return lwIP error code (@see udp_send for possible error codes)
yueee_yt 0:7766f6712673 472 *
yueee_yt 0:7766f6712673 473 * @see udp_disconnect() udp_send()
yueee_yt 0:7766f6712673 474 */
yueee_yt 0:7766f6712673 475 err_t
yueee_yt 0:7766f6712673 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
yueee_yt 0:7766f6712673 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
yueee_yt 0:7766f6712673 478 {
yueee_yt 0:7766f6712673 479 #if LWIP_CHECKSUM_ON_COPY
yueee_yt 0:7766f6712673 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
yueee_yt 0:7766f6712673 481 }
yueee_yt 0:7766f6712673 482
yueee_yt 0:7766f6712673 483 /** Same as udp_sendto_if(), but with checksum */
yueee_yt 0:7766f6712673 484 err_t
yueee_yt 0:7766f6712673 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
yueee_yt 0:7766f6712673 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
yueee_yt 0:7766f6712673 487 u16_t chksum)
yueee_yt 0:7766f6712673 488 {
yueee_yt 0:7766f6712673 489 #endif /* LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 490 struct udp_hdr *udphdr;
yueee_yt 0:7766f6712673 491 ip_addr_t *src_ip;
yueee_yt 0:7766f6712673 492 err_t err;
yueee_yt 0:7766f6712673 493 struct pbuf *q; /* q will be sent down the stack */
yueee_yt 0:7766f6712673 494
yueee_yt 0:7766f6712673 495 #if IP_SOF_BROADCAST
yueee_yt 0:7766f6712673 496 /* broadcast filter? */
yueee_yt 0:7766f6712673 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
yueee_yt 0:7766f6712673 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
yueee_yt 0:7766f6712673 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
yueee_yt 0:7766f6712673 500 return ERR_VAL;
yueee_yt 0:7766f6712673 501 }
yueee_yt 0:7766f6712673 502 #endif /* IP_SOF_BROADCAST */
yueee_yt 0:7766f6712673 503
yueee_yt 0:7766f6712673 504 /* if the PCB is not yet bound to a port, bind it here */
yueee_yt 0:7766f6712673 505 if (pcb->local_port == 0) {
yueee_yt 0:7766f6712673 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
yueee_yt 0:7766f6712673 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
yueee_yt 0:7766f6712673 508 if (err != ERR_OK) {
yueee_yt 0:7766f6712673 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
yueee_yt 0:7766f6712673 510 return err;
yueee_yt 0:7766f6712673 511 }
yueee_yt 0:7766f6712673 512 }
yueee_yt 0:7766f6712673 513
yueee_yt 0:7766f6712673 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
yueee_yt 0:7766f6712673 515 if (pbuf_header(p, UDP_HLEN)) {
yueee_yt 0:7766f6712673 516 /* allocate header in a separate new pbuf */
yueee_yt 0:7766f6712673 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
yueee_yt 0:7766f6712673 518 /* new header pbuf could not be allocated? */
yueee_yt 0:7766f6712673 519 if (q == NULL) {
yueee_yt 0:7766f6712673 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
yueee_yt 0:7766f6712673 521 return ERR_MEM;
yueee_yt 0:7766f6712673 522 }
yueee_yt 0:7766f6712673 523 if (p->tot_len != 0) {
yueee_yt 0:7766f6712673 524 /* chain header q in front of given pbuf p (only if p contains data) */
yueee_yt 0:7766f6712673 525 pbuf_chain(q, p);
yueee_yt 0:7766f6712673 526 }
yueee_yt 0:7766f6712673 527 /* first pbuf q points to header pbuf */
yueee_yt 0:7766f6712673 528 LWIP_DEBUGF(UDP_DEBUG,
yueee_yt 0:7766f6712673 529 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
yueee_yt 0:7766f6712673 530 } else {
yueee_yt 0:7766f6712673 531 /* adding space for header within p succeeded */
yueee_yt 0:7766f6712673 532 /* first pbuf q equals given pbuf */
yueee_yt 0:7766f6712673 533 q = p;
yueee_yt 0:7766f6712673 534 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
yueee_yt 0:7766f6712673 535 }
yueee_yt 0:7766f6712673 536 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
yueee_yt 0:7766f6712673 537 (q->len >= sizeof(struct udp_hdr)));
yueee_yt 0:7766f6712673 538 /* q now represents the packet to be sent */
yueee_yt 0:7766f6712673 539 udphdr = (struct udp_hdr *)q->payload;
yueee_yt 0:7766f6712673 540 udphdr->src = htons(pcb->local_port);
yueee_yt 0:7766f6712673 541 udphdr->dest = htons(dst_port);
yueee_yt 0:7766f6712673 542 /* in UDP, 0 checksum means 'no checksum' */
yueee_yt 0:7766f6712673 543 udphdr->chksum = 0x0000;
yueee_yt 0:7766f6712673 544
yueee_yt 0:7766f6712673 545 /* Multicast Loop? */
yueee_yt 0:7766f6712673 546 #if LWIP_IGMP
yueee_yt 0:7766f6712673 547 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
yueee_yt 0:7766f6712673 548 q->flags |= PBUF_FLAG_MCASTLOOP;
yueee_yt 0:7766f6712673 549 }
yueee_yt 0:7766f6712673 550 #endif /* LWIP_IGMP */
yueee_yt 0:7766f6712673 551
yueee_yt 0:7766f6712673 552
yueee_yt 0:7766f6712673 553 /* PCB local address is IP_ANY_ADDR? */
yueee_yt 0:7766f6712673 554 if (ip_addr_isany(&pcb->local_ip)) {
yueee_yt 0:7766f6712673 555 /* use outgoing network interface IP address as source address */
yueee_yt 0:7766f6712673 556 src_ip = &(netif->ip_addr);
yueee_yt 0:7766f6712673 557 } else {
yueee_yt 0:7766f6712673 558 /* check if UDP PCB local IP address is correct
yueee_yt 0:7766f6712673 559 * this could be an old address if netif->ip_addr has changed */
yueee_yt 0:7766f6712673 560 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
yueee_yt 0:7766f6712673 561 /* local_ip doesn't match, drop the packet */
yueee_yt 0:7766f6712673 562 if (q != p) {
yueee_yt 0:7766f6712673 563 /* free the header pbuf */
yueee_yt 0:7766f6712673 564 pbuf_free(q);
yueee_yt 0:7766f6712673 565 q = NULL;
yueee_yt 0:7766f6712673 566 /* p is still referenced by the caller, and will live on */
yueee_yt 0:7766f6712673 567 }
yueee_yt 0:7766f6712673 568 return ERR_VAL;
yueee_yt 0:7766f6712673 569 }
yueee_yt 0:7766f6712673 570 /* use UDP PCB local IP address as source address */
yueee_yt 0:7766f6712673 571 src_ip = &(pcb->local_ip);
yueee_yt 0:7766f6712673 572 }
yueee_yt 0:7766f6712673 573
yueee_yt 0:7766f6712673 574 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
yueee_yt 0:7766f6712673 575
yueee_yt 0:7766f6712673 576 #if LWIP_UDPLITE
yueee_yt 0:7766f6712673 577 /* UDP Lite protocol? */
yueee_yt 0:7766f6712673 578 if (pcb->flags & UDP_FLAGS_UDPLITE) {
yueee_yt 0:7766f6712673 579 u16_t chklen, chklen_hdr;
yueee_yt 0:7766f6712673 580 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
yueee_yt 0:7766f6712673 581 /* set UDP message length in UDP header */
yueee_yt 0:7766f6712673 582 chklen_hdr = chklen = pcb->chksum_len_tx;
yueee_yt 0:7766f6712673 583 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
yueee_yt 0:7766f6712673 584 if (chklen != 0) {
yueee_yt 0:7766f6712673 585 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
yueee_yt 0:7766f6712673 586 }
yueee_yt 0:7766f6712673 587 /* For UDP-Lite, checksum length of 0 means checksum
yueee_yt 0:7766f6712673 588 over the complete packet. (See RFC 3828 chap. 3.1)
yueee_yt 0:7766f6712673 589 At least the UDP-Lite header must be covered by the
yueee_yt 0:7766f6712673 590 checksum, therefore, if chksum_len has an illegal
yueee_yt 0:7766f6712673 591 value, we generate the checksum over the complete
yueee_yt 0:7766f6712673 592 packet to be safe. */
yueee_yt 0:7766f6712673 593 chklen_hdr = 0;
yueee_yt 0:7766f6712673 594 chklen = q->tot_len;
yueee_yt 0:7766f6712673 595 }
yueee_yt 0:7766f6712673 596 udphdr->len = htons(chklen_hdr);
yueee_yt 0:7766f6712673 597 /* calculate checksum */
yueee_yt 0:7766f6712673 598 #if CHECKSUM_GEN_UDP
yueee_yt 0:7766f6712673 599 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
yueee_yt 0:7766f6712673 600 IP_PROTO_UDPLITE, q->tot_len,
yueee_yt 0:7766f6712673 601 #if !LWIP_CHECKSUM_ON_COPY
yueee_yt 0:7766f6712673 602 chklen);
yueee_yt 0:7766f6712673 603 #else /* !LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 604 (have_chksum ? UDP_HLEN : chklen));
yueee_yt 0:7766f6712673 605 if (have_chksum) {
yueee_yt 0:7766f6712673 606 u32_t acc;
yueee_yt 0:7766f6712673 607 acc = udphdr->chksum + (u16_t)~(chksum);
yueee_yt 0:7766f6712673 608 udphdr->chksum = FOLD_U32T(acc);
yueee_yt 0:7766f6712673 609 }
yueee_yt 0:7766f6712673 610 #endif /* !LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 611
yueee_yt 0:7766f6712673 612 /* chksum zero must become 0xffff, as zero means 'no checksum' */
yueee_yt 0:7766f6712673 613 if (udphdr->chksum == 0x0000) {
yueee_yt 0:7766f6712673 614 udphdr->chksum = 0xffff;
yueee_yt 0:7766f6712673 615 }
yueee_yt 0:7766f6712673 616 #endif /* CHECKSUM_GEN_UDP */
yueee_yt 0:7766f6712673 617 /* output to IP */
yueee_yt 0:7766f6712673 618 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
yueee_yt 0:7766f6712673 619 #if LWIP_NETIF_HWADDRHINT
yueee_yt 0:7766f6712673 620 netif->addr_hint = &(pcb->addr_hint);
yueee_yt 0:7766f6712673 621 #endif /* LWIP_NETIF_HWADDRHINT*/
yueee_yt 0:7766f6712673 622 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
yueee_yt 0:7766f6712673 623 #if LWIP_NETIF_HWADDRHINT
yueee_yt 0:7766f6712673 624 netif->addr_hint = NULL;
yueee_yt 0:7766f6712673 625 #endif /* LWIP_NETIF_HWADDRHINT*/
yueee_yt 0:7766f6712673 626 } else
yueee_yt 0:7766f6712673 627 #endif /* LWIP_UDPLITE */
yueee_yt 0:7766f6712673 628 { /* UDP */
yueee_yt 0:7766f6712673 629 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
yueee_yt 0:7766f6712673 630 udphdr->len = htons(q->tot_len);
yueee_yt 0:7766f6712673 631 /* calculate checksum */
yueee_yt 0:7766f6712673 632 #if CHECKSUM_GEN_UDP
yueee_yt 0:7766f6712673 633 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
yueee_yt 0:7766f6712673 634 u16_t udpchksum;
yueee_yt 0:7766f6712673 635 #if LWIP_CHECKSUM_ON_COPY
yueee_yt 0:7766f6712673 636 if (have_chksum) {
yueee_yt 0:7766f6712673 637 u32_t acc;
yueee_yt 0:7766f6712673 638 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
yueee_yt 0:7766f6712673 639 q->tot_len, UDP_HLEN);
yueee_yt 0:7766f6712673 640 acc = udpchksum + (u16_t)~(chksum);
yueee_yt 0:7766f6712673 641 udpchksum = FOLD_U32T(acc);
yueee_yt 0:7766f6712673 642 } else
yueee_yt 0:7766f6712673 643 #endif /* LWIP_CHECKSUM_ON_COPY */
yueee_yt 0:7766f6712673 644 {
yueee_yt 0:7766f6712673 645 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
yueee_yt 0:7766f6712673 646 }
yueee_yt 0:7766f6712673 647
yueee_yt 0:7766f6712673 648 /* chksum zero must become 0xffff, as zero means 'no checksum' */
yueee_yt 0:7766f6712673 649 if (udpchksum == 0x0000) {
yueee_yt 0:7766f6712673 650 udpchksum = 0xffff;
yueee_yt 0:7766f6712673 651 }
yueee_yt 0:7766f6712673 652 udphdr->chksum = udpchksum;
yueee_yt 0:7766f6712673 653 }
yueee_yt 0:7766f6712673 654 #endif /* CHECKSUM_GEN_UDP */
yueee_yt 0:7766f6712673 655 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
yueee_yt 0:7766f6712673 656 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
yueee_yt 0:7766f6712673 657 /* output to IP */
yueee_yt 0:7766f6712673 658 #if LWIP_NETIF_HWADDRHINT
yueee_yt 0:7766f6712673 659 netif->addr_hint = &(pcb->addr_hint);
yueee_yt 0:7766f6712673 660 #endif /* LWIP_NETIF_HWADDRHINT*/
yueee_yt 0:7766f6712673 661 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
yueee_yt 0:7766f6712673 662 #if LWIP_NETIF_HWADDRHINT
yueee_yt 0:7766f6712673 663 netif->addr_hint = NULL;
yueee_yt 0:7766f6712673 664 #endif /* LWIP_NETIF_HWADDRHINT*/
yueee_yt 0:7766f6712673 665 }
yueee_yt 0:7766f6712673 666 /* TODO: must this be increased even if error occured? */
yueee_yt 0:7766f6712673 667 snmp_inc_udpoutdatagrams();
yueee_yt 0:7766f6712673 668
yueee_yt 0:7766f6712673 669 /* did we chain a separate header pbuf earlier? */
yueee_yt 0:7766f6712673 670 if (q != p) {
yueee_yt 0:7766f6712673 671 /* free the header pbuf */
yueee_yt 0:7766f6712673 672 pbuf_free(q);
yueee_yt 0:7766f6712673 673 q = NULL;
yueee_yt 0:7766f6712673 674 /* p is still referenced by the caller, and will live on */
yueee_yt 0:7766f6712673 675 }
yueee_yt 0:7766f6712673 676
yueee_yt 0:7766f6712673 677 UDP_STATS_INC(udp.xmit);
yueee_yt 0:7766f6712673 678 return err;
yueee_yt 0:7766f6712673 679 }
yueee_yt 0:7766f6712673 680
yueee_yt 0:7766f6712673 681 /**
yueee_yt 0:7766f6712673 682 * Bind an UDP PCB.
yueee_yt 0:7766f6712673 683 *
yueee_yt 0:7766f6712673 684 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
yueee_yt 0:7766f6712673 685 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
yueee_yt 0:7766f6712673 686 * bind to all local interfaces.
yueee_yt 0:7766f6712673 687 * @param port local UDP port to bind with. Use 0 to automatically bind
yueee_yt 0:7766f6712673 688 * to a random port between UDP_LOCAL_PORT_RANGE_START and
yueee_yt 0:7766f6712673 689 * UDP_LOCAL_PORT_RANGE_END.
yueee_yt 0:7766f6712673 690 *
yueee_yt 0:7766f6712673 691 * ipaddr & port are expected to be in the same byte order as in the pcb.
yueee_yt 0:7766f6712673 692 *
yueee_yt 0:7766f6712673 693 * @return lwIP error code.
yueee_yt 0:7766f6712673 694 * - ERR_OK. Successful. No error occured.
yueee_yt 0:7766f6712673 695 * - ERR_USE. The specified ipaddr and port are already bound to by
yueee_yt 0:7766f6712673 696 * another UDP PCB.
yueee_yt 0:7766f6712673 697 *
yueee_yt 0:7766f6712673 698 * @see udp_disconnect()
yueee_yt 0:7766f6712673 699 */
yueee_yt 0:7766f6712673 700 err_t
yueee_yt 0:7766f6712673 701 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
yueee_yt 0:7766f6712673 702 {
yueee_yt 0:7766f6712673 703 struct udp_pcb *ipcb;
yueee_yt 0:7766f6712673 704 u8_t rebind;
yueee_yt 0:7766f6712673 705
yueee_yt 0:7766f6712673 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
yueee_yt 0:7766f6712673 707 ip_addr_debug_print(UDP_DEBUG, ipaddr);
yueee_yt 0:7766f6712673 708 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
yueee_yt 0:7766f6712673 709
yueee_yt 0:7766f6712673 710 rebind = 0;
yueee_yt 0:7766f6712673 711 /* Check for double bind and rebind of the same pcb */
yueee_yt 0:7766f6712673 712 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
yueee_yt 0:7766f6712673 713 /* is this UDP PCB already on active list? */
yueee_yt 0:7766f6712673 714 if (pcb == ipcb) {
yueee_yt 0:7766f6712673 715 /* pcb may occur at most once in active list */
yueee_yt 0:7766f6712673 716 LWIP_ASSERT("rebind == 0", rebind == 0);
yueee_yt 0:7766f6712673 717 /* pcb already in list, just rebind */
yueee_yt 0:7766f6712673 718 rebind = 1;
yueee_yt 0:7766f6712673 719 }
yueee_yt 0:7766f6712673 720
yueee_yt 0:7766f6712673 721 /* By default, we don't allow to bind to a port that any other udp
yueee_yt 0:7766f6712673 722 PCB is alread bound to, unless *all* PCBs with that port have tha
yueee_yt 0:7766f6712673 723 REUSEADDR flag set. */
yueee_yt 0:7766f6712673 724 #if SO_REUSE
yueee_yt 0:7766f6712673 725 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
yueee_yt 0:7766f6712673 726 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
yueee_yt 0:7766f6712673 727 #else /* SO_REUSE */
yueee_yt 0:7766f6712673 728 /* port matches that of PCB in list and REUSEADDR not set -> reject */
yueee_yt 0:7766f6712673 729 else {
yueee_yt 0:7766f6712673 730 #endif /* SO_REUSE */
yueee_yt 0:7766f6712673 731 if ((ipcb->local_port == port) &&
yueee_yt 0:7766f6712673 732 /* IP address matches, or one is IP_ADDR_ANY? */
yueee_yt 0:7766f6712673 733 (ip_addr_isany(&(ipcb->local_ip)) ||
yueee_yt 0:7766f6712673 734 ip_addr_isany(ipaddr) ||
yueee_yt 0:7766f6712673 735 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
yueee_yt 0:7766f6712673 736 /* other PCB already binds to this local IP and port */
yueee_yt 0:7766f6712673 737 LWIP_DEBUGF(UDP_DEBUG,
yueee_yt 0:7766f6712673 738 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
yueee_yt 0:7766f6712673 739 return ERR_USE;
yueee_yt 0:7766f6712673 740 }
yueee_yt 0:7766f6712673 741 }
yueee_yt 0:7766f6712673 742 }
yueee_yt 0:7766f6712673 743
yueee_yt 0:7766f6712673 744 ip_addr_set(&pcb->local_ip, ipaddr);
yueee_yt 0:7766f6712673 745
yueee_yt 0:7766f6712673 746 /* no port specified? */
yueee_yt 0:7766f6712673 747 if (port == 0) {
yueee_yt 0:7766f6712673 748 #ifndef UDP_LOCAL_PORT_RANGE_START
yueee_yt 0:7766f6712673 749 /* From http://www.iana.org/assignments/port-numbers:
yueee_yt 0:7766f6712673 750 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
yueee_yt 0:7766f6712673 751 #define UDP_LOCAL_PORT_RANGE_START 0xc000
yueee_yt 0:7766f6712673 752 #define UDP_LOCAL_PORT_RANGE_END 0xffff
yueee_yt 0:7766f6712673 753 #endif
yueee_yt 0:7766f6712673 754 port = UDP_LOCAL_PORT_RANGE_START;
yueee_yt 0:7766f6712673 755 ipcb = udp_pcbs;
yueee_yt 0:7766f6712673 756 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
yueee_yt 0:7766f6712673 757 if (ipcb->local_port == port) {
yueee_yt 0:7766f6712673 758 /* port is already used by another udp_pcb */
yueee_yt 0:7766f6712673 759 port++;
yueee_yt 0:7766f6712673 760 /* restart scanning all udp pcbs */
yueee_yt 0:7766f6712673 761 ipcb = udp_pcbs;
yueee_yt 0:7766f6712673 762 } else {
yueee_yt 0:7766f6712673 763 /* go on with next udp pcb */
yueee_yt 0:7766f6712673 764 ipcb = ipcb->next;
yueee_yt 0:7766f6712673 765 }
yueee_yt 0:7766f6712673 766 }
yueee_yt 0:7766f6712673 767 if (ipcb != NULL) {
yueee_yt 0:7766f6712673 768 /* no more ports available in local range */
yueee_yt 0:7766f6712673 769 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
yueee_yt 0:7766f6712673 770 return ERR_USE;
yueee_yt 0:7766f6712673 771 }
yueee_yt 0:7766f6712673 772 }
yueee_yt 0:7766f6712673 773 pcb->local_port = port;
yueee_yt 0:7766f6712673 774 snmp_insert_udpidx_tree(pcb);
yueee_yt 0:7766f6712673 775 /* pcb not active yet? */
yueee_yt 0:7766f6712673 776 if (rebind == 0) {
yueee_yt 0:7766f6712673 777 /* place the PCB on the active list if not already there */
yueee_yt 0:7766f6712673 778 pcb->next = udp_pcbs;
yueee_yt 0:7766f6712673 779 udp_pcbs = pcb;
yueee_yt 0:7766f6712673 780 }
yueee_yt 0:7766f6712673 781 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
yueee_yt 0:7766f6712673 782 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
yueee_yt 0:7766f6712673 783 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
yueee_yt 0:7766f6712673 784 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
yueee_yt 0:7766f6712673 785 pcb->local_port));
yueee_yt 0:7766f6712673 786 return ERR_OK;
yueee_yt 0:7766f6712673 787 }
yueee_yt 0:7766f6712673 788 /**
yueee_yt 0:7766f6712673 789 * Connect an UDP PCB.
yueee_yt 0:7766f6712673 790 *
yueee_yt 0:7766f6712673 791 * This will associate the UDP PCB with the remote address.
yueee_yt 0:7766f6712673 792 *
yueee_yt 0:7766f6712673 793 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
yueee_yt 0:7766f6712673 794 * @param ipaddr remote IP address to connect with.
yueee_yt 0:7766f6712673 795 * @param port remote UDP port to connect with.
yueee_yt 0:7766f6712673 796 *
yueee_yt 0:7766f6712673 797 * @return lwIP error code
yueee_yt 0:7766f6712673 798 *
yueee_yt 0:7766f6712673 799 * ipaddr & port are expected to be in the same byte order as in the pcb.
yueee_yt 0:7766f6712673 800 *
yueee_yt 0:7766f6712673 801 * The udp pcb is bound to a random local port if not already bound.
yueee_yt 0:7766f6712673 802 *
yueee_yt 0:7766f6712673 803 * @see udp_disconnect()
yueee_yt 0:7766f6712673 804 */
yueee_yt 0:7766f6712673 805 err_t
yueee_yt 0:7766f6712673 806 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
yueee_yt 0:7766f6712673 807 {
yueee_yt 0:7766f6712673 808 struct udp_pcb *ipcb;
yueee_yt 0:7766f6712673 809
yueee_yt 0:7766f6712673 810 if (pcb->local_port == 0) {
yueee_yt 0:7766f6712673 811 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
yueee_yt 0:7766f6712673 812 if (err != ERR_OK) {
yueee_yt 0:7766f6712673 813 return err;
yueee_yt 0:7766f6712673 814 }
yueee_yt 0:7766f6712673 815 }
yueee_yt 0:7766f6712673 816
yueee_yt 0:7766f6712673 817 ip_addr_set(&pcb->remote_ip, ipaddr);
yueee_yt 0:7766f6712673 818 pcb->remote_port = port;
yueee_yt 0:7766f6712673 819 pcb->flags |= UDP_FLAGS_CONNECTED;
yueee_yt 0:7766f6712673 820 /** TODO: this functionality belongs in upper layers */
yueee_yt 0:7766f6712673 821 #ifdef LWIP_UDP_TODO
yueee_yt 0:7766f6712673 822 /* Nail down local IP for netconn_addr()/getsockname() */
yueee_yt 0:7766f6712673 823 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
yueee_yt 0:7766f6712673 824 struct netif *netif;
yueee_yt 0:7766f6712673 825
yueee_yt 0:7766f6712673 826 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
yueee_yt 0:7766f6712673 827 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
yueee_yt 0:7766f6712673 828 UDP_STATS_INC(udp.rterr);
yueee_yt 0:7766f6712673 829 return ERR_RTE;
yueee_yt 0:7766f6712673 830 }
yueee_yt 0:7766f6712673 831 /** TODO: this will bind the udp pcb locally, to the interface which
yueee_yt 0:7766f6712673 832 is used to route output packets to the remote address. However, we
yueee_yt 0:7766f6712673 833 might want to accept incoming packets on any interface! */
yueee_yt 0:7766f6712673 834 pcb->local_ip = netif->ip_addr;
yueee_yt 0:7766f6712673 835 } else if (ip_addr_isany(&pcb->remote_ip)) {
yueee_yt 0:7766f6712673 836 pcb->local_ip.addr = 0;
yueee_yt 0:7766f6712673 837 }
yueee_yt 0:7766f6712673 838 #endif
yueee_yt 0:7766f6712673 839 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
yueee_yt 0:7766f6712673 840 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
yueee_yt 0:7766f6712673 841 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
yueee_yt 0:7766f6712673 842 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
yueee_yt 0:7766f6712673 843 pcb->local_port));
yueee_yt 0:7766f6712673 844
yueee_yt 0:7766f6712673 845 /* Insert UDP PCB into the list of active UDP PCBs. */
yueee_yt 0:7766f6712673 846 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
yueee_yt 0:7766f6712673 847 if (pcb == ipcb) {
yueee_yt 0:7766f6712673 848 /* already on the list, just return */
yueee_yt 0:7766f6712673 849 return ERR_OK;
yueee_yt 0:7766f6712673 850 }
yueee_yt 0:7766f6712673 851 }
yueee_yt 0:7766f6712673 852 /* PCB not yet on the list, add PCB now */
yueee_yt 0:7766f6712673 853 pcb->next = udp_pcbs;
yueee_yt 0:7766f6712673 854 udp_pcbs = pcb;
yueee_yt 0:7766f6712673 855 return ERR_OK;
yueee_yt 0:7766f6712673 856 }
yueee_yt 0:7766f6712673 857
yueee_yt 0:7766f6712673 858 /**
yueee_yt 0:7766f6712673 859 * Disconnect a UDP PCB
yueee_yt 0:7766f6712673 860 *
yueee_yt 0:7766f6712673 861 * @param pcb the udp pcb to disconnect.
yueee_yt 0:7766f6712673 862 */
yueee_yt 0:7766f6712673 863 void
yueee_yt 0:7766f6712673 864 udp_disconnect(struct udp_pcb *pcb)
yueee_yt 0:7766f6712673 865 {
yueee_yt 0:7766f6712673 866 /* reset remote address association */
yueee_yt 0:7766f6712673 867 ip_addr_set_any(&pcb->remote_ip);
yueee_yt 0:7766f6712673 868 pcb->remote_port = 0;
yueee_yt 0:7766f6712673 869 /* mark PCB as unconnected */
yueee_yt 0:7766f6712673 870 pcb->flags &= ~UDP_FLAGS_CONNECTED;
yueee_yt 0:7766f6712673 871 }
yueee_yt 0:7766f6712673 872
yueee_yt 0:7766f6712673 873 /**
yueee_yt 0:7766f6712673 874 * Set a receive callback for a UDP PCB
yueee_yt 0:7766f6712673 875 *
yueee_yt 0:7766f6712673 876 * This callback will be called when receiving a datagram for the pcb.
yueee_yt 0:7766f6712673 877 *
yueee_yt 0:7766f6712673 878 * @param pcb the pcb for wich to set the recv callback
yueee_yt 0:7766f6712673 879 * @param recv function pointer of the callback function
yueee_yt 0:7766f6712673 880 * @param recv_arg additional argument to pass to the callback function
yueee_yt 0:7766f6712673 881 */
yueee_yt 0:7766f6712673 882 void
yueee_yt 0:7766f6712673 883 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
yueee_yt 0:7766f6712673 884 {
yueee_yt 0:7766f6712673 885 /* remember recv() callback and user data */
yueee_yt 0:7766f6712673 886 pcb->recv = recv;
yueee_yt 0:7766f6712673 887 pcb->recv_arg = recv_arg;
yueee_yt 0:7766f6712673 888 }
yueee_yt 0:7766f6712673 889
yueee_yt 0:7766f6712673 890 /**
yueee_yt 0:7766f6712673 891 * Remove an UDP PCB.
yueee_yt 0:7766f6712673 892 *
yueee_yt 0:7766f6712673 893 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
yueee_yt 0:7766f6712673 894 * UDP PCB's and the data structure is freed from memory.
yueee_yt 0:7766f6712673 895 *
yueee_yt 0:7766f6712673 896 * @see udp_new()
yueee_yt 0:7766f6712673 897 */
yueee_yt 0:7766f6712673 898 void
yueee_yt 0:7766f6712673 899 udp_remove(struct udp_pcb *pcb)
yueee_yt 0:7766f6712673 900 {
yueee_yt 0:7766f6712673 901 struct udp_pcb *pcb2;
yueee_yt 0:7766f6712673 902
yueee_yt 0:7766f6712673 903 snmp_delete_udpidx_tree(pcb);
yueee_yt 0:7766f6712673 904 /* pcb to be removed is first in list? */
yueee_yt 0:7766f6712673 905 if (udp_pcbs == pcb) {
yueee_yt 0:7766f6712673 906 /* make list start at 2nd pcb */
yueee_yt 0:7766f6712673 907 udp_pcbs = udp_pcbs->next;
yueee_yt 0:7766f6712673 908 /* pcb not 1st in list */
yueee_yt 0:7766f6712673 909 } else {
yueee_yt 0:7766f6712673 910 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
yueee_yt 0:7766f6712673 911 /* find pcb in udp_pcbs list */
yueee_yt 0:7766f6712673 912 if (pcb2->next != NULL && pcb2->next == pcb) {
yueee_yt 0:7766f6712673 913 /* remove pcb from list */
yueee_yt 0:7766f6712673 914 pcb2->next = pcb->next;
yueee_yt 0:7766f6712673 915 }
yueee_yt 0:7766f6712673 916 }
yueee_yt 0:7766f6712673 917 }
yueee_yt 0:7766f6712673 918 memp_free(MEMP_UDP_PCB, pcb);
yueee_yt 0:7766f6712673 919 }
yueee_yt 0:7766f6712673 920
yueee_yt 0:7766f6712673 921 /**
yueee_yt 0:7766f6712673 922 * Create a UDP PCB.
yueee_yt 0:7766f6712673 923 *
yueee_yt 0:7766f6712673 924 * @return The UDP PCB which was created. NULL if the PCB data structure
yueee_yt 0:7766f6712673 925 * could not be allocated.
yueee_yt 0:7766f6712673 926 *
yueee_yt 0:7766f6712673 927 * @see udp_remove()
yueee_yt 0:7766f6712673 928 */
yueee_yt 0:7766f6712673 929 struct udp_pcb *
yueee_yt 0:7766f6712673 930 udp_new(void)
yueee_yt 0:7766f6712673 931 {
yueee_yt 0:7766f6712673 932 struct udp_pcb *pcb;
yueee_yt 0:7766f6712673 933 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
yueee_yt 0:7766f6712673 934 /* could allocate UDP PCB? */
yueee_yt 0:7766f6712673 935 if (pcb != NULL) {
yueee_yt 0:7766f6712673 936 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
yueee_yt 0:7766f6712673 937 * which means checksum is generated over the whole datagram per default
yueee_yt 0:7766f6712673 938 * (recommended as default by RFC 3828). */
yueee_yt 0:7766f6712673 939 /* initialize PCB to all zeroes */
yueee_yt 0:7766f6712673 940 memset(pcb, 0, sizeof(struct udp_pcb));
yueee_yt 0:7766f6712673 941 pcb->ttl = UDP_TTL;
yueee_yt 0:7766f6712673 942 }
yueee_yt 0:7766f6712673 943 return pcb;
yueee_yt 0:7766f6712673 944 }
yueee_yt 0:7766f6712673 945
yueee_yt 0:7766f6712673 946 #if UDP_DEBUG
yueee_yt 0:7766f6712673 947 /**
yueee_yt 0:7766f6712673 948 * Print UDP header information for debug purposes.
yueee_yt 0:7766f6712673 949 *
yueee_yt 0:7766f6712673 950 * @param udphdr pointer to the udp header in memory.
yueee_yt 0:7766f6712673 951 */
yueee_yt 0:7766f6712673 952 void
yueee_yt 0:7766f6712673 953 udp_debug_print(struct udp_hdr *udphdr)
yueee_yt 0:7766f6712673 954 {
yueee_yt 0:7766f6712673 955 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
yueee_yt 0:7766f6712673 956 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
yueee_yt 0:7766f6712673 957 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
yueee_yt 0:7766f6712673 958 ntohs(udphdr->src), ntohs(udphdr->dest)));
yueee_yt 0:7766f6712673 959 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
yueee_yt 0:7766f6712673 960 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
yueee_yt 0:7766f6712673 961 ntohs(udphdr->len), ntohs(udphdr->chksum)));
yueee_yt 0:7766f6712673 962 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
yueee_yt 0:7766f6712673 963 }
yueee_yt 0:7766f6712673 964 #endif /* UDP_DEBUG */
yueee_yt 0:7766f6712673 965
yueee_yt 0:7766f6712673 966 #endif /* LWIP_UDP */