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lwip/core/udp.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /**
grzemich 0:d7bd7384a37c 2 * @file
grzemich 0:d7bd7384a37c 3 * User Datagram Protocol module
grzemich 0:d7bd7384a37c 4 *
grzemich 0:d7bd7384a37c 5 */
grzemich 0:d7bd7384a37c 6
grzemich 0:d7bd7384a37c 7 /*
grzemich 0:d7bd7384a37c 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
grzemich 0:d7bd7384a37c 9 * All rights reserved.
grzemich 0:d7bd7384a37c 10 *
grzemich 0:d7bd7384a37c 11 * Redistribution and use in source and binary forms, with or without modification,
grzemich 0:d7bd7384a37c 12 * are permitted provided that the following conditions are met:
grzemich 0:d7bd7384a37c 13 *
grzemich 0:d7bd7384a37c 14 * 1. Redistributions of source code must retain the above copyright notice,
grzemich 0:d7bd7384a37c 15 * this list of conditions and the following disclaimer.
grzemich 0:d7bd7384a37c 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
grzemich 0:d7bd7384a37c 17 * this list of conditions and the following disclaimer in the documentation
grzemich 0:d7bd7384a37c 18 * and/or other materials provided with the distribution.
grzemich 0:d7bd7384a37c 19 * 3. The name of the author may not be used to endorse or promote products
grzemich 0:d7bd7384a37c 20 * derived from this software without specific prior written permission.
grzemich 0:d7bd7384a37c 21 *
grzemich 0:d7bd7384a37c 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
grzemich 0:d7bd7384a37c 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
grzemich 0:d7bd7384a37c 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
grzemich 0:d7bd7384a37c 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
grzemich 0:d7bd7384a37c 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
grzemich 0:d7bd7384a37c 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
grzemich 0:d7bd7384a37c 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
grzemich 0:d7bd7384a37c 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
grzemich 0:d7bd7384a37c 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
grzemich 0:d7bd7384a37c 31 * OF SUCH DAMAGE.
grzemich 0:d7bd7384a37c 32 *
grzemich 0:d7bd7384a37c 33 * This file is part of the lwIP TCP/IP stack.
grzemich 0:d7bd7384a37c 34 *
grzemich 0:d7bd7384a37c 35 * Author: Adam Dunkels <adam@sics.se>
grzemich 0:d7bd7384a37c 36 *
grzemich 0:d7bd7384a37c 37 */
grzemich 0:d7bd7384a37c 38
grzemich 0:d7bd7384a37c 39
grzemich 0:d7bd7384a37c 40 /* udp.c
grzemich 0:d7bd7384a37c 41 *
grzemich 0:d7bd7384a37c 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
grzemich 0:d7bd7384a37c 43 *
grzemich 0:d7bd7384a37c 44 */
grzemich 0:d7bd7384a37c 45
grzemich 0:d7bd7384a37c 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
grzemich 0:d7bd7384a37c 47 */
grzemich 0:d7bd7384a37c 48
grzemich 0:d7bd7384a37c 49 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 50
grzemich 0:d7bd7384a37c 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 52
grzemich 0:d7bd7384a37c 53 #include "lwip/udp.h"
grzemich 0:d7bd7384a37c 54 #include "lwip/def.h"
grzemich 0:d7bd7384a37c 55 #include "lwip/memp.h"
grzemich 0:d7bd7384a37c 56 #include "lwip/inet_chksum.h"
grzemich 0:d7bd7384a37c 57 #include "lwip/ip_addr.h"
grzemich 0:d7bd7384a37c 58 #include "lwip/netif.h"
grzemich 0:d7bd7384a37c 59 #include "lwip/icmp.h"
grzemich 0:d7bd7384a37c 60 #include "lwip/stats.h"
grzemich 0:d7bd7384a37c 61 #include "lwip/snmp.h"
grzemich 0:d7bd7384a37c 62 #include "arch/perf.h"
grzemich 0:d7bd7384a37c 63 #include "lwip/dhcp.h"
grzemich 0:d7bd7384a37c 64
grzemich 0:d7bd7384a37c 65 #include <string.h>
grzemich 0:d7bd7384a37c 66
grzemich 0:d7bd7384a37c 67 /* The list of UDP PCBs */
grzemich 0:d7bd7384a37c 68 /* exported in udp.h (was static) */
grzemich 0:d7bd7384a37c 69 struct udp_pcb *udp_pcbs;
grzemich 0:d7bd7384a37c 70
grzemich 0:d7bd7384a37c 71 /**
grzemich 0:d7bd7384a37c 72 * Process an incoming UDP datagram.
grzemich 0:d7bd7384a37c 73 *
grzemich 0:d7bd7384a37c 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
grzemich 0:d7bd7384a37c 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
grzemich 0:d7bd7384a37c 76 * recv function. If no pcb is found or the datagram is incorrect, the
grzemich 0:d7bd7384a37c 77 * pbuf is freed.
grzemich 0:d7bd7384a37c 78 *
grzemich 0:d7bd7384a37c 79 * @param p pbuf to be demultiplexed to a UDP PCB.
grzemich 0:d7bd7384a37c 80 * @param inp network interface on which the datagram was received.
grzemich 0:d7bd7384a37c 81 *
grzemich 0:d7bd7384a37c 82 */
grzemich 0:d7bd7384a37c 83 void
grzemich 0:d7bd7384a37c 84 udp_input(struct pbuf *p, struct netif *inp)
grzemich 0:d7bd7384a37c 85 {
grzemich 0:d7bd7384a37c 86 struct udp_hdr *udphdr;
grzemich 0:d7bd7384a37c 87 struct udp_pcb *pcb, *prev;
grzemich 0:d7bd7384a37c 88 struct udp_pcb *uncon_pcb;
grzemich 0:d7bd7384a37c 89 struct ip_hdr *iphdr;
grzemich 0:d7bd7384a37c 90 u16_t src, dest;
grzemich 0:d7bd7384a37c 91 u8_t local_match;
grzemich 0:d7bd7384a37c 92 u8_t broadcast;
grzemich 0:d7bd7384a37c 93
grzemich 0:d7bd7384a37c 94 PERF_START;
grzemich 0:d7bd7384a37c 95
grzemich 0:d7bd7384a37c 96 UDP_STATS_INC(udp.recv);
grzemich 0:d7bd7384a37c 97
grzemich 0:d7bd7384a37c 98 iphdr = (struct ip_hdr *)p->payload;
grzemich 0:d7bd7384a37c 99
grzemich 0:d7bd7384a37c 100 /* Check minimum length (IP header + UDP header)
grzemich 0:d7bd7384a37c 101 * and move payload pointer to UDP header */
grzemich 0:d7bd7384a37c 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
grzemich 0:d7bd7384a37c 103 /* drop short packets */
grzemich 0:d7bd7384a37c 104 LWIP_DEBUGF(UDP_DEBUG,
grzemich 0:d7bd7384a37c 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
grzemich 0:d7bd7384a37c 106 UDP_STATS_INC(udp.lenerr);
grzemich 0:d7bd7384a37c 107 UDP_STATS_INC(udp.drop);
grzemich 0:d7bd7384a37c 108 snmp_inc_udpinerrors();
grzemich 0:d7bd7384a37c 109 pbuf_free(p);
grzemich 0:d7bd7384a37c 110 goto end;
grzemich 0:d7bd7384a37c 111 }
grzemich 0:d7bd7384a37c 112
grzemich 0:d7bd7384a37c 113 udphdr = (struct udp_hdr *)p->payload;
grzemich 0:d7bd7384a37c 114
grzemich 0:d7bd7384a37c 115 /* is broadcast packet ? */
grzemich 0:d7bd7384a37c 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
grzemich 0:d7bd7384a37c 117
grzemich 0:d7bd7384a37c 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
grzemich 0:d7bd7384a37c 119
grzemich 0:d7bd7384a37c 120 /* convert src and dest ports to host byte order */
grzemich 0:d7bd7384a37c 121 src = ntohs(udphdr->src);
grzemich 0:d7bd7384a37c 122 dest = ntohs(udphdr->dest);
grzemich 0:d7bd7384a37c 123
grzemich 0:d7bd7384a37c 124 udp_debug_print(udphdr);
grzemich 0:d7bd7384a37c 125
grzemich 0:d7bd7384a37c 126 /* print the UDP source and destination */
grzemich 0:d7bd7384a37c 127 LWIP_DEBUGF(UDP_DEBUG,
grzemich 0:d7bd7384a37c 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
grzemich 0:d7bd7384a37c 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
grzemich 0:d7bd7384a37c 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
grzemich 0:d7bd7384a37c 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
grzemich 0:d7bd7384a37c 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
grzemich 0:d7bd7384a37c 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
grzemich 0:d7bd7384a37c 134
grzemich 0:d7bd7384a37c 135 #if LWIP_DHCP
grzemich 0:d7bd7384a37c 136 pcb = NULL;
grzemich 0:d7bd7384a37c 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
grzemich 0:d7bd7384a37c 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
grzemich 0:d7bd7384a37c 139 if (dest == DHCP_CLIENT_PORT) {
grzemich 0:d7bd7384a37c 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
grzemich 0:d7bd7384a37c 141 if (src == DHCP_SERVER_PORT) {
grzemich 0:d7bd7384a37c 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
grzemich 0:d7bd7384a37c 143 /* accept the packe if
grzemich 0:d7bd7384a37c 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
grzemich 0:d7bd7384a37c 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
grzemich 0:d7bd7384a37c 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
grzemich 0:d7bd7384a37c 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
grzemich 0:d7bd7384a37c 148 pcb = inp->dhcp->pcb;
grzemich 0:d7bd7384a37c 149 }
grzemich 0:d7bd7384a37c 150 }
grzemich 0:d7bd7384a37c 151 }
grzemich 0:d7bd7384a37c 152 } else
grzemich 0:d7bd7384a37c 153 #endif /* LWIP_DHCP */
grzemich 0:d7bd7384a37c 154 {
grzemich 0:d7bd7384a37c 155 prev = NULL;
grzemich 0:d7bd7384a37c 156 local_match = 0;
grzemich 0:d7bd7384a37c 157 uncon_pcb = NULL;
grzemich 0:d7bd7384a37c 158 /* Iterate through the UDP pcb list for a matching pcb.
grzemich 0:d7bd7384a37c 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
grzemich 0:d7bd7384a37c 160 * preferred. If no perfect match is found, the first unconnected pcb that
grzemich 0:d7bd7384a37c 161 * matches the local port and ip address gets the datagram. */
grzemich 0:d7bd7384a37c 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
grzemich 0:d7bd7384a37c 163 local_match = 0;
grzemich 0:d7bd7384a37c 164 /* print the PCB local and remote address */
grzemich 0:d7bd7384a37c 165 LWIP_DEBUGF(UDP_DEBUG,
grzemich 0:d7bd7384a37c 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
grzemich 0:d7bd7384a37c 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
grzemich 0:d7bd7384a37c 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
grzemich 0:d7bd7384a37c 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
grzemich 0:d7bd7384a37c 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
grzemich 0:d7bd7384a37c 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
grzemich 0:d7bd7384a37c 172
grzemich 0:d7bd7384a37c 173 /* compare PCB local addr+port to UDP destination addr+port */
grzemich 0:d7bd7384a37c 174 if ((pcb->local_port == dest) &&
grzemich 0:d7bd7384a37c 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
grzemich 0:d7bd7384a37c 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
grzemich 0:d7bd7384a37c 177 #if LWIP_IGMP
grzemich 0:d7bd7384a37c 178 ip_addr_ismulticast(&current_iphdr_dest) ||
grzemich 0:d7bd7384a37c 179 #endif /* LWIP_IGMP */
grzemich 0:d7bd7384a37c 180 #if IP_SOF_BROADCAST_RECV
grzemich 0:d7bd7384a37c 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
grzemich 0:d7bd7384a37c 182 #else /* IP_SOF_BROADCAST_RECV */
grzemich 0:d7bd7384a37c 183 (broadcast))) {
grzemich 0:d7bd7384a37c 184 #endif /* IP_SOF_BROADCAST_RECV */
grzemich 0:d7bd7384a37c 185 local_match = 1;
grzemich 0:d7bd7384a37c 186 if ((uncon_pcb == NULL) &&
grzemich 0:d7bd7384a37c 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
grzemich 0:d7bd7384a37c 188 /* the first unconnected matching PCB */
grzemich 0:d7bd7384a37c 189 uncon_pcb = pcb;
grzemich 0:d7bd7384a37c 190 }
grzemich 0:d7bd7384a37c 191 }
grzemich 0:d7bd7384a37c 192 /* compare PCB remote addr+port to UDP source addr+port */
grzemich 0:d7bd7384a37c 193 if ((local_match != 0) &&
grzemich 0:d7bd7384a37c 194 (pcb->remote_port == src) &&
grzemich 0:d7bd7384a37c 195 (ip_addr_isany(&pcb->remote_ip) ||
grzemich 0:d7bd7384a37c 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
grzemich 0:d7bd7384a37c 197 /* the first fully matching PCB */
grzemich 0:d7bd7384a37c 198 if (prev != NULL) {
grzemich 0:d7bd7384a37c 199 /* move the pcb to the front of udp_pcbs so that is
grzemich 0:d7bd7384a37c 200 found faster next time */
grzemich 0:d7bd7384a37c 201 prev->next = pcb->next;
grzemich 0:d7bd7384a37c 202 pcb->next = udp_pcbs;
grzemich 0:d7bd7384a37c 203 udp_pcbs = pcb;
grzemich 0:d7bd7384a37c 204 } else {
grzemich 0:d7bd7384a37c 205 UDP_STATS_INC(udp.cachehit);
grzemich 0:d7bd7384a37c 206 }
grzemich 0:d7bd7384a37c 207 break;
grzemich 0:d7bd7384a37c 208 }
grzemich 0:d7bd7384a37c 209 prev = pcb;
grzemich 0:d7bd7384a37c 210 }
grzemich 0:d7bd7384a37c 211 /* no fully matching pcb found? then look for an unconnected pcb */
grzemich 0:d7bd7384a37c 212 if (pcb == NULL) {
grzemich 0:d7bd7384a37c 213 pcb = uncon_pcb;
grzemich 0:d7bd7384a37c 214 }
grzemich 0:d7bd7384a37c 215 }
grzemich 0:d7bd7384a37c 216
grzemich 0:d7bd7384a37c 217 /* Check checksum if this is a match or if it was directed at us. */
grzemich 0:d7bd7384a37c 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
grzemich 0:d7bd7384a37c 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
grzemich 0:d7bd7384a37c 220 #if LWIP_UDPLITE
grzemich 0:d7bd7384a37c 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
grzemich 0:d7bd7384a37c 222 /* Do the UDP Lite checksum */
grzemich 0:d7bd7384a37c 223 #if CHECKSUM_CHECK_UDP
grzemich 0:d7bd7384a37c 224 u16_t chklen = ntohs(udphdr->len);
grzemich 0:d7bd7384a37c 225 if (chklen < sizeof(struct udp_hdr)) {
grzemich 0:d7bd7384a37c 226 if (chklen == 0) {
grzemich 0:d7bd7384a37c 227 /* For UDP-Lite, checksum length of 0 means checksum
grzemich 0:d7bd7384a37c 228 over the complete packet (See RFC 3828 chap. 3.1) */
grzemich 0:d7bd7384a37c 229 chklen = p->tot_len;
grzemich 0:d7bd7384a37c 230 } else {
grzemich 0:d7bd7384a37c 231 /* At least the UDP-Lite header must be covered by the
grzemich 0:d7bd7384a37c 232 checksum! (Again, see RFC 3828 chap. 3.1) */
grzemich 0:d7bd7384a37c 233 UDP_STATS_INC(udp.chkerr);
grzemich 0:d7bd7384a37c 234 UDP_STATS_INC(udp.drop);
grzemich 0:d7bd7384a37c 235 snmp_inc_udpinerrors();
grzemich 0:d7bd7384a37c 236 pbuf_free(p);
grzemich 0:d7bd7384a37c 237 goto end;
grzemich 0:d7bd7384a37c 238 }
grzemich 0:d7bd7384a37c 239 }
grzemich 0:d7bd7384a37c 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
grzemich 0:d7bd7384a37c 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
grzemich 0:d7bd7384a37c 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
grzemich 0:d7bd7384a37c 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
grzemich 0:d7bd7384a37c 244 UDP_STATS_INC(udp.chkerr);
grzemich 0:d7bd7384a37c 245 UDP_STATS_INC(udp.drop);
grzemich 0:d7bd7384a37c 246 snmp_inc_udpinerrors();
grzemich 0:d7bd7384a37c 247 pbuf_free(p);
grzemich 0:d7bd7384a37c 248 goto end;
grzemich 0:d7bd7384a37c 249 }
grzemich 0:d7bd7384a37c 250 #endif /* CHECKSUM_CHECK_UDP */
grzemich 0:d7bd7384a37c 251 } else
grzemich 0:d7bd7384a37c 252 #endif /* LWIP_UDPLITE */
grzemich 0:d7bd7384a37c 253 {
grzemich 0:d7bd7384a37c 254 #if CHECKSUM_CHECK_UDP
grzemich 0:d7bd7384a37c 255 if (udphdr->chksum != 0) {
grzemich 0:d7bd7384a37c 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
grzemich 0:d7bd7384a37c 257 IP_PROTO_UDP, p->tot_len) != 0) {
grzemich 0:d7bd7384a37c 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
grzemich 0:d7bd7384a37c 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
grzemich 0:d7bd7384a37c 260 UDP_STATS_INC(udp.chkerr);
grzemich 0:d7bd7384a37c 261 UDP_STATS_INC(udp.drop);
grzemich 0:d7bd7384a37c 262 snmp_inc_udpinerrors();
grzemich 0:d7bd7384a37c 263 pbuf_free(p);
grzemich 0:d7bd7384a37c 264 goto end;
grzemich 0:d7bd7384a37c 265 }
grzemich 0:d7bd7384a37c 266 }
grzemich 0:d7bd7384a37c 267 #endif /* CHECKSUM_CHECK_UDP */
grzemich 0:d7bd7384a37c 268 }
grzemich 0:d7bd7384a37c 269 if(pbuf_header(p, -UDP_HLEN)) {
grzemich 0:d7bd7384a37c 270 /* Can we cope with this failing? Just assert for now */
grzemich 0:d7bd7384a37c 271 LWIP_ASSERT("pbuf_header failed\n", 0);
grzemich 0:d7bd7384a37c 272 UDP_STATS_INC(udp.drop);
grzemich 0:d7bd7384a37c 273 snmp_inc_udpinerrors();
grzemich 0:d7bd7384a37c 274 pbuf_free(p);
grzemich 0:d7bd7384a37c 275 goto end;
grzemich 0:d7bd7384a37c 276 }
grzemich 0:d7bd7384a37c 277 if (pcb != NULL) {
grzemich 0:d7bd7384a37c 278 snmp_inc_udpindatagrams();
grzemich 0:d7bd7384a37c 279 #if SO_REUSE && SO_REUSE_RXTOALL
grzemich 0:d7bd7384a37c 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
grzemich 0:d7bd7384a37c 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
grzemich 0:d7bd7384a37c 282 /* pass broadcast- or multicast packets to all multicast pcbs
grzemich 0:d7bd7384a37c 283 if SOF_REUSEADDR is set on the first match */
grzemich 0:d7bd7384a37c 284 struct udp_pcb *mpcb;
grzemich 0:d7bd7384a37c 285 u8_t p_header_changed = 0;
grzemich 0:d7bd7384a37c 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
grzemich 0:d7bd7384a37c 287 if (mpcb != pcb) {
grzemich 0:d7bd7384a37c 288 /* compare PCB local addr+port to UDP destination addr+port */
grzemich 0:d7bd7384a37c 289 if ((mpcb->local_port == dest) &&
grzemich 0:d7bd7384a37c 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
grzemich 0:d7bd7384a37c 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
grzemich 0:d7bd7384a37c 292 #if LWIP_IGMP
grzemich 0:d7bd7384a37c 293 ip_addr_ismulticast(&current_iphdr_dest) ||
grzemich 0:d7bd7384a37c 294 #endif /* LWIP_IGMP */
grzemich 0:d7bd7384a37c 295 #if IP_SOF_BROADCAST_RECV
grzemich 0:d7bd7384a37c 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
grzemich 0:d7bd7384a37c 297 #else /* IP_SOF_BROADCAST_RECV */
grzemich 0:d7bd7384a37c 298 (broadcast))) {
grzemich 0:d7bd7384a37c 299 #endif /* IP_SOF_BROADCAST_RECV */
grzemich 0:d7bd7384a37c 300 /* pass a copy of the packet to all local matches */
grzemich 0:d7bd7384a37c 301 if (mpcb->recv != NULL) {
grzemich 0:d7bd7384a37c 302 struct pbuf *q;
grzemich 0:d7bd7384a37c 303 /* for that, move payload to IP header again */
grzemich 0:d7bd7384a37c 304 if (p_header_changed == 0) {
grzemich 0:d7bd7384a37c 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
grzemich 0:d7bd7384a37c 306 p_header_changed = 1;
grzemich 0:d7bd7384a37c 307 }
grzemich 0:d7bd7384a37c 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
grzemich 0:d7bd7384a37c 309 if (q != NULL) {
grzemich 0:d7bd7384a37c 310 err_t err = pbuf_copy(q, p);
grzemich 0:d7bd7384a37c 311 if (err == ERR_OK) {
grzemich 0:d7bd7384a37c 312 /* move payload to UDP data */
grzemich 0:d7bd7384a37c 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
grzemich 0:d7bd7384a37c 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
grzemich 0:d7bd7384a37c 315 }
grzemich 0:d7bd7384a37c 316 }
grzemich 0:d7bd7384a37c 317 }
grzemich 0:d7bd7384a37c 318 }
grzemich 0:d7bd7384a37c 319 }
grzemich 0:d7bd7384a37c 320 }
grzemich 0:d7bd7384a37c 321 if (p_header_changed) {
grzemich 0:d7bd7384a37c 322 /* and move payload to UDP data again */
grzemich 0:d7bd7384a37c 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
grzemich 0:d7bd7384a37c 324 }
grzemich 0:d7bd7384a37c 325 }
grzemich 0:d7bd7384a37c 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
grzemich 0:d7bd7384a37c 327 /* callback */
grzemich 0:d7bd7384a37c 328 if (pcb->recv != NULL) {
grzemich 0:d7bd7384a37c 329 /* now the recv function is responsible for freeing p */
grzemich 0:d7bd7384a37c 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
grzemich 0:d7bd7384a37c 331 } else {
grzemich 0:d7bd7384a37c 332 /* no recv function registered? then we have to free the pbuf! */
grzemich 0:d7bd7384a37c 333 pbuf_free(p);
grzemich 0:d7bd7384a37c 334 goto end;
grzemich 0:d7bd7384a37c 335 }
grzemich 0:d7bd7384a37c 336 } else {
grzemich 0:d7bd7384a37c 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
grzemich 0:d7bd7384a37c 338
grzemich 0:d7bd7384a37c 339 #if LWIP_ICMP
grzemich 0:d7bd7384a37c 340 /* No match was found, send ICMP destination port unreachable unless
grzemich 0:d7bd7384a37c 341 destination address was broadcast/multicast. */
grzemich 0:d7bd7384a37c 342 if (!broadcast &&
grzemich 0:d7bd7384a37c 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
grzemich 0:d7bd7384a37c 344 /* move payload pointer back to ip header */
grzemich 0:d7bd7384a37c 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
grzemich 0:d7bd7384a37c 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
grzemich 0:d7bd7384a37c 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
grzemich 0:d7bd7384a37c 348 }
grzemich 0:d7bd7384a37c 349 #endif /* LWIP_ICMP */
grzemich 0:d7bd7384a37c 350 UDP_STATS_INC(udp.proterr);
grzemich 0:d7bd7384a37c 351 UDP_STATS_INC(udp.drop);
grzemich 0:d7bd7384a37c 352 snmp_inc_udpnoports();
grzemich 0:d7bd7384a37c 353 pbuf_free(p);
grzemich 0:d7bd7384a37c 354 }
grzemich 0:d7bd7384a37c 355 } else {
grzemich 0:d7bd7384a37c 356 pbuf_free(p);
grzemich 0:d7bd7384a37c 357 }
grzemich 0:d7bd7384a37c 358 end:
grzemich 0:d7bd7384a37c 359 PERF_STOP("udp_input");
grzemich 0:d7bd7384a37c 360 }
grzemich 0:d7bd7384a37c 361
grzemich 0:d7bd7384a37c 362 /**
grzemich 0:d7bd7384a37c 363 * Send data using UDP.
grzemich 0:d7bd7384a37c 364 *
grzemich 0:d7bd7384a37c 365 * @param pcb UDP PCB used to send the data.
grzemich 0:d7bd7384a37c 366 * @param p chain of pbuf's to be sent.
grzemich 0:d7bd7384a37c 367 *
grzemich 0:d7bd7384a37c 368 * The datagram will be sent to the current remote_ip & remote_port
grzemich 0:d7bd7384a37c 369 * stored in pcb. If the pcb is not bound to a port, it will
grzemich 0:d7bd7384a37c 370 * automatically be bound to a random port.
grzemich 0:d7bd7384a37c 371 *
grzemich 0:d7bd7384a37c 372 * @return lwIP error code.
grzemich 0:d7bd7384a37c 373 * - ERR_OK. Successful. No error occured.
grzemich 0:d7bd7384a37c 374 * - ERR_MEM. Out of memory.
grzemich 0:d7bd7384a37c 375 * - ERR_RTE. Could not find route to destination address.
grzemich 0:d7bd7384a37c 376 * - More errors could be returned by lower protocol layers.
grzemich 0:d7bd7384a37c 377 *
grzemich 0:d7bd7384a37c 378 * @see udp_disconnect() udp_sendto()
grzemich 0:d7bd7384a37c 379 */
grzemich 0:d7bd7384a37c 380 err_t
grzemich 0:d7bd7384a37c 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
grzemich 0:d7bd7384a37c 382 {
grzemich 0:d7bd7384a37c 383 /* send to the packet using remote ip and port stored in the pcb */
grzemich 0:d7bd7384a37c 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
grzemich 0:d7bd7384a37c 385 }
grzemich 0:d7bd7384a37c 386
grzemich 0:d7bd7384a37c 387 #if LWIP_CHECKSUM_ON_COPY
grzemich 0:d7bd7384a37c 388 /** Same as udp_send() but with checksum
grzemich 0:d7bd7384a37c 389 */
grzemich 0:d7bd7384a37c 390 err_t
grzemich 0:d7bd7384a37c 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
grzemich 0:d7bd7384a37c 392 u8_t have_chksum, u16_t chksum)
grzemich 0:d7bd7384a37c 393 {
grzemich 0:d7bd7384a37c 394 /* send to the packet using remote ip and port stored in the pcb */
grzemich 0:d7bd7384a37c 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
grzemich 0:d7bd7384a37c 396 have_chksum, chksum);
grzemich 0:d7bd7384a37c 397 }
grzemich 0:d7bd7384a37c 398 #endif /* LWIP_CHECKSUM_ON_COPY */
grzemich 0:d7bd7384a37c 399
grzemich 0:d7bd7384a37c 400 /**
grzemich 0:d7bd7384a37c 401 * Send data to a specified address using UDP.
grzemich 0:d7bd7384a37c 402 *
grzemich 0:d7bd7384a37c 403 * @param pcb UDP PCB used to send the data.
grzemich 0:d7bd7384a37c 404 * @param p chain of pbuf's to be sent.
grzemich 0:d7bd7384a37c 405 * @param dst_ip Destination IP address.
grzemich 0:d7bd7384a37c 406 * @param dst_port Destination UDP port.
grzemich 0:d7bd7384a37c 407 *
grzemich 0:d7bd7384a37c 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
grzemich 0:d7bd7384a37c 409 *
grzemich 0:d7bd7384a37c 410 * If the PCB already has a remote address association, it will
grzemich 0:d7bd7384a37c 411 * be restored after the data is sent.
grzemich 0:d7bd7384a37c 412 *
grzemich 0:d7bd7384a37c 413 * @return lwIP error code (@see udp_send for possible error codes)
grzemich 0:d7bd7384a37c 414 *
grzemich 0:d7bd7384a37c 415 * @see udp_disconnect() udp_send()
grzemich 0:d7bd7384a37c 416 */
grzemich 0:d7bd7384a37c 417 err_t
grzemich 0:d7bd7384a37c 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
grzemich 0:d7bd7384a37c 419 ip_addr_t *dst_ip, u16_t dst_port)
grzemich 0:d7bd7384a37c 420 {
grzemich 0:d7bd7384a37c 421 #if LWIP_CHECKSUM_ON_COPY
grzemich 0:d7bd7384a37c 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
grzemich 0:d7bd7384a37c 423 }
grzemich 0:d7bd7384a37c 424
grzemich 0:d7bd7384a37c 425 /** Same as udp_sendto(), but with checksum */
grzemich 0:d7bd7384a37c 426 err_t
grzemich 0:d7bd7384a37c 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
grzemich 0:d7bd7384a37c 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
grzemich 0:d7bd7384a37c 429 {
grzemich 0:d7bd7384a37c 430 #endif /* LWIP_CHECKSUM_ON_COPY */
grzemich 0:d7bd7384a37c 431 struct netif *netif;
grzemich 0:d7bd7384a37c 432
grzemich 0:d7bd7384a37c 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
grzemich 0:d7bd7384a37c 434
grzemich 0:d7bd7384a37c 435 /* find the outgoing network interface for this packet */
grzemich 0:d7bd7384a37c 436 #if LWIP_IGMP
grzemich 0:d7bd7384a37c 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
grzemich 0:d7bd7384a37c 438 #else
grzemich 0:d7bd7384a37c 439 netif = ip_route(dst_ip);
grzemich 0:d7bd7384a37c 440 #endif /* LWIP_IGMP */
grzemich 0:d7bd7384a37c 441
grzemich 0:d7bd7384a37c 442 /* no outgoing network interface could be found? */
grzemich 0:d7bd7384a37c 443 if (netif == NULL) {
grzemich 0:d7bd7384a37c 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
grzemich 0:d7bd7384a37c 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
grzemich 0:d7bd7384a37c 446 UDP_STATS_INC(udp.rterr);
grzemich 0:d7bd7384a37c 447 return ERR_RTE;
grzemich 0:d7bd7384a37c 448 }
grzemich 0:d7bd7384a37c 449 #if LWIP_CHECKSUM_ON_COPY
grzemich 0:d7bd7384a37c 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
grzemich 0:d7bd7384a37c 451 #else /* LWIP_CHECKSUM_ON_COPY */
grzemich 0:d7bd7384a37c 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
grzemich 0:d7bd7384a37c 453 #endif /* LWIP_CHECKSUM_ON_COPY */
grzemich 0:d7bd7384a37c 454 }
grzemich 0:d7bd7384a37c 455
grzemich 0:d7bd7384a37c 456 /**
grzemich 0:d7bd7384a37c 457 * Send data to a specified address using UDP.
grzemich 0:d7bd7384a37c 458 * The netif used for sending can be specified.
grzemich 0:d7bd7384a37c 459 *
grzemich 0:d7bd7384a37c 460 * This function exists mainly for DHCP, to be able to send UDP packets
grzemich 0:d7bd7384a37c 461 * on a netif that is still down.
grzemich 0:d7bd7384a37c 462 *
grzemich 0:d7bd7384a37c 463 * @param pcb UDP PCB used to send the data.
grzemich 0:d7bd7384a37c 464 * @param p chain of pbuf's to be sent.
grzemich 0:d7bd7384a37c 465 * @param dst_ip Destination IP address.
grzemich 0:d7bd7384a37c 466 * @param dst_port Destination UDP port.
grzemich 0:d7bd7384a37c 467 * @param netif the netif used for sending.
grzemich 0:d7bd7384a37c 468 *
grzemich 0:d7bd7384a37c 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
grzemich 0:d7bd7384a37c 470 *
grzemich 0:d7bd7384a37c 471 * @return lwIP error code (@see udp_send for possible error codes)
grzemich 0:d7bd7384a37c 472 *
grzemich 0:d7bd7384a37c 473 * @see udp_disconnect() udp_send()
grzemich 0:d7bd7384a37c 474 */
grzemich 0:d7bd7384a37c 475 err_t
grzemich 0:d7bd7384a37c 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
grzemich 0:d7bd7384a37c 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
grzemich 0:d7bd7384a37c 478 {
grzemich 0:d7bd7384a37c 479 #if LWIP_CHECKSUM_ON_COPY
grzemich 0:d7bd7384a37c 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
grzemich 0:d7bd7384a37c 481 }
grzemich 0:d7bd7384a37c 482
grzemich 0:d7bd7384a37c 483 /** Same as udp_sendto_if(), but with checksum */
grzemich 0:d7bd7384a37c 484 err_t
grzemich 0:d7bd7384a37c 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
grzemich 0:d7bd7384a37c 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
grzemich 0:d7bd7384a37c 487 u16_t chksum)
grzemich 0:d7bd7384a37c 488 {
grzemich 0:d7bd7384a37c 489 #endif /* LWIP_CHECKSUM_ON_COPY */
grzemich 0:d7bd7384a37c 490 struct udp_hdr *udphdr;
grzemich 0:d7bd7384a37c 491 ip_addr_t *src_ip;
grzemich 0:d7bd7384a37c 492 err_t err;
grzemich 0:d7bd7384a37c 493 struct pbuf *q; /* q will be sent down the stack */
grzemich 0:d7bd7384a37c 494
grzemich 0:d7bd7384a37c 495 #if IP_SOF_BROADCAST
grzemich 0:d7bd7384a37c 496 /* broadcast filter? */
grzemich 0:d7bd7384a37c 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
grzemich 0:d7bd7384a37c 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
grzemich 0:d7bd7384a37c 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
grzemich 0:d7bd7384a37c 500 return ERR_VAL;
grzemich 0:d7bd7384a37c 501 }
grzemich 0:d7bd7384a37c 502 #endif /* IP_SOF_BROADCAST */
grzemich 0:d7bd7384a37c 503
grzemich 0:d7bd7384a37c 504 /* if the PCB is not yet bound to a port, bind it here */
grzemich 0:d7bd7384a37c 505 if (pcb->local_port == 0) {
grzemich 0:d7bd7384a37c 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
grzemich 0:d7bd7384a37c 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
grzemich 0:d7bd7384a37c 508 if (err != ERR_OK) {
grzemich 0:d7bd7384a37c 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
grzemich 0:d7bd7384a37c 510 return err;
grzemich 0:d7bd7384a37c 511 }
grzemich 0:d7bd7384a37c 512 }
grzemich 0:d7bd7384a37c 513
grzemich 0:d7bd7384a37c 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
grzemich 0:d7bd7384a37c 515 if (pbuf_header(p, UDP_HLEN)) {
grzemich 0:d7bd7384a37c 516 /* allocate header in a separate new pbuf */
grzemich 0:d7bd7384a37c 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
grzemich 0:d7bd7384a37c 518 /* new header pbuf could not be allocated? */
grzemich 0:d7bd7384a37c 519 if (q == NULL) {
grzemich 0:d7bd7384a37c 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
grzemich 0:d7bd7384a37c 521 return ERR_MEM;
grzemich 0:d7bd7384a37c 522 }
grzemich 0:d7bd7384a37c 523 if (p->tot_len != 0) {
grzemich 0:d7bd7384a37c 524 /* chain header q in front of given pbuf p (only if p contains data) */
grzemich 0:d7bd7384a37c 525 pbuf_chain(q, p);
grzemich 0:d7bd7384a37c 526 }
grzemich 0:d7bd7384a37c 527 /* first pbuf q points to header pbuf */
grzemich 0:d7bd7384a37c 528 LWIP_DEBUGF(UDP_DEBUG,
grzemich 0:d7bd7384a37c 529 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
grzemich 0:d7bd7384a37c 530 } else {
grzemich 0:d7bd7384a37c 531 /* adding space for header within p succeeded */
grzemich 0:d7bd7384a37c 532 /* first pbuf q equals given pbuf */
grzemich 0:d7bd7384a37c 533 q = p;
grzemich 0:d7bd7384a37c 534 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
grzemich 0:d7bd7384a37c 535 }
grzemich 0:d7bd7384a37c 536 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
grzemich 0:d7bd7384a37c 537 (q->len >= sizeof(struct udp_hdr)));
grzemich 0:d7bd7384a37c 538 /* q now represents the packet to be sent */
grzemich 0:d7bd7384a37c 539 udphdr = (struct udp_hdr *)q->payload;
grzemich 0:d7bd7384a37c 540 udphdr->src = htons(pcb->local_port);
grzemich 0:d7bd7384a37c 541 udphdr->dest = htons(dst_port);
grzemich 0:d7bd7384a37c 542 /* in UDP, 0 checksum means 'no checksum' */
grzemich 0:d7bd7384a37c 543 udphdr->chksum = 0x0000;
grzemich 0:d7bd7384a37c 544
grzemich 0:d7bd7384a37c 545 /* Multicast Loop? */
grzemich 0:d7bd7384a37c 546 #if LWIP_IGMP
grzemich 0:d7bd7384a37c 547 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
grzemich 0:d7bd7384a37c 548 q->flags |= PBUF_FLAG_MCASTLOOP;
grzemich 0:d7bd7384a37c 549 }
grzemich 0:d7bd7384a37c 550 #endif /* LWIP_IGMP */
grzemich 0:d7bd7384a37c 551
grzemich 0:d7bd7384a37c 552
grzemich 0:d7bd7384a37c 553 /* PCB local address is IP_ANY_ADDR? */
grzemich 0:d7bd7384a37c 554 if (ip_addr_isany(&pcb->local_ip)) {
grzemich 0:d7bd7384a37c 555 /* use outgoing network interface IP address as source address */
grzemich 0:d7bd7384a37c 556 src_ip = &(netif->ip_addr);
grzemich 0:d7bd7384a37c 557 } else {
grzemich 0:d7bd7384a37c 558 /* check if UDP PCB local IP address is correct
grzemich 0:d7bd7384a37c 559 * this could be an old address if netif->ip_addr has changed */
grzemich 0:d7bd7384a37c 560 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
grzemich 0:d7bd7384a37c 561 /* local_ip doesn't match, drop the packet */
grzemich 0:d7bd7384a37c 562 if (q != p) {
grzemich 0:d7bd7384a37c 563 /* free the header pbuf */
grzemich 0:d7bd7384a37c 564 pbuf_free(q);
grzemich 0:d7bd7384a37c 565 q = NULL;
grzemich 0:d7bd7384a37c 566 /* p is still referenced by the caller, and will live on */
grzemich 0:d7bd7384a37c 567 }
grzemich 0:d7bd7384a37c 568 return ERR_VAL;
grzemich 0:d7bd7384a37c 569 }
grzemich 0:d7bd7384a37c 570 /* use UDP PCB local IP address as source address */
grzemich 0:d7bd7384a37c 571 src_ip = &(pcb->local_ip);
grzemich 0:d7bd7384a37c 572 }
grzemich 0:d7bd7384a37c 573
grzemich 0:d7bd7384a37c 574 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
grzemich 0:d7bd7384a37c 575
grzemich 0:d7bd7384a37c 576 #if LWIP_UDPLITE
grzemich 0:d7bd7384a37c 577 /* UDP Lite protocol? */
grzemich 0:d7bd7384a37c 578 if (pcb->flags & UDP_FLAGS_UDPLITE) {
grzemich 0:d7bd7384a37c 579 u16_t chklen, chklen_hdr;
grzemich 0:d7bd7384a37c 580 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
grzemich 0:d7bd7384a37c 581 /* set UDP message length in UDP header */
grzemich 0:d7bd7384a37c 582 chklen_hdr = chklen = pcb->chksum_len_tx;
grzemich 0:d7bd7384a37c 583 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
grzemich 0:d7bd7384a37c 584 if (chklen != 0) {
grzemich 0:d7bd7384a37c 585 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
grzemich 0:d7bd7384a37c 586 }
grzemich 0:d7bd7384a37c 587 /* For UDP-Lite, checksum length of 0 means checksum
grzemich 0:d7bd7384a37c 588 over the complete packet. (See RFC 3828 chap. 3.1)
grzemich 0:d7bd7384a37c 589 At least the UDP-Lite header must be covered by the
grzemich 0:d7bd7384a37c 590 checksum, therefore, if chksum_len has an illegal
grzemich 0:d7bd7384a37c 591 value, we generate the checksum over the complete
grzemich 0:d7bd7384a37c 592 packet to be safe. */
grzemich 0:d7bd7384a37c 593 chklen_hdr = 0;
grzemich 0:d7bd7384a37c 594 chklen = q->tot_len;
grzemich 0:d7bd7384a37c 595 }
grzemich 0:d7bd7384a37c 596 udphdr->len = htons(chklen_hdr);
grzemich 0:d7bd7384a37c 597 /* calculate checksum */
grzemich 0:d7bd7384a37c 598 #if CHECKSUM_GEN_UDP
grzemich 0:d7bd7384a37c 599 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
grzemich 0:d7bd7384a37c 600 IP_PROTO_UDPLITE, q->tot_len,
grzemich 0:d7bd7384a37c 601 #if !LWIP_CHECKSUM_ON_COPY
grzemich 0:d7bd7384a37c 602 chklen);
grzemich 0:d7bd7384a37c 603 #else /* !LWIP_CHECKSUM_ON_COPY */
grzemich 0:d7bd7384a37c 604 (have_chksum ? UDP_HLEN : chklen));
grzemich 0:d7bd7384a37c 605 if (have_chksum) {
grzemich 0:d7bd7384a37c 606 u32_t acc;
grzemich 0:d7bd7384a37c 607 acc = udphdr->chksum + (u16_t)~(chksum);
grzemich 0:d7bd7384a37c 608 udphdr->chksum = FOLD_U32T(acc);
grzemich 0:d7bd7384a37c 609 }
grzemich 0:d7bd7384a37c 610 #endif /* !LWIP_CHECKSUM_ON_COPY */
grzemich 0:d7bd7384a37c 611
grzemich 0:d7bd7384a37c 612 /* chksum zero must become 0xffff, as zero means 'no checksum' */
grzemich 0:d7bd7384a37c 613 if (udphdr->chksum == 0x0000) {
grzemich 0:d7bd7384a37c 614 udphdr->chksum = 0xffff;
grzemich 0:d7bd7384a37c 615 }
grzemich 0:d7bd7384a37c 616 #endif /* CHECKSUM_GEN_UDP */
grzemich 0:d7bd7384a37c 617 /* output to IP */
grzemich 0:d7bd7384a37c 618 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
grzemich 0:d7bd7384a37c 619 #if LWIP_NETIF_HWADDRHINT
grzemich 0:d7bd7384a37c 620 netif->addr_hint = &(pcb->addr_hint);
grzemich 0:d7bd7384a37c 621 #endif /* LWIP_NETIF_HWADDRHINT*/
grzemich 0:d7bd7384a37c 622 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
grzemich 0:d7bd7384a37c 623 #if LWIP_NETIF_HWADDRHINT
grzemich 0:d7bd7384a37c 624 netif->addr_hint = NULL;
grzemich 0:d7bd7384a37c 625 #endif /* LWIP_NETIF_HWADDRHINT*/
grzemich 0:d7bd7384a37c 626 } else
grzemich 0:d7bd7384a37c 627 #endif /* LWIP_UDPLITE */
grzemich 0:d7bd7384a37c 628 { /* UDP */
grzemich 0:d7bd7384a37c 629 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
grzemich 0:d7bd7384a37c 630 udphdr->len = htons(q->tot_len);
grzemich 0:d7bd7384a37c 631 /* calculate checksum */
grzemich 0:d7bd7384a37c 632 #if CHECKSUM_GEN_UDP
grzemich 0:d7bd7384a37c 633 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
grzemich 0:d7bd7384a37c 634 u16_t udpchksum;
grzemich 0:d7bd7384a37c 635 #if LWIP_CHECKSUM_ON_COPY
grzemich 0:d7bd7384a37c 636 if (have_chksum) {
grzemich 0:d7bd7384a37c 637 u32_t acc;
grzemich 0:d7bd7384a37c 638 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
grzemich 0:d7bd7384a37c 639 q->tot_len, UDP_HLEN);
grzemich 0:d7bd7384a37c 640 acc = udpchksum + (u16_t)~(chksum);
grzemich 0:d7bd7384a37c 641 udpchksum = FOLD_U32T(acc);
grzemich 0:d7bd7384a37c 642 } else
grzemich 0:d7bd7384a37c 643 #endif /* LWIP_CHECKSUM_ON_COPY */
grzemich 0:d7bd7384a37c 644 {
grzemich 0:d7bd7384a37c 645 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
grzemich 0:d7bd7384a37c 646 }
grzemich 0:d7bd7384a37c 647
grzemich 0:d7bd7384a37c 648 /* chksum zero must become 0xffff, as zero means 'no checksum' */
grzemich 0:d7bd7384a37c 649 if (udpchksum == 0x0000) {
grzemich 0:d7bd7384a37c 650 udpchksum = 0xffff;
grzemich 0:d7bd7384a37c 651 }
grzemich 0:d7bd7384a37c 652 udphdr->chksum = udpchksum;
grzemich 0:d7bd7384a37c 653 }
grzemich 0:d7bd7384a37c 654 #endif /* CHECKSUM_GEN_UDP */
grzemich 0:d7bd7384a37c 655 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
grzemich 0:d7bd7384a37c 656 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
grzemich 0:d7bd7384a37c 657 /* output to IP */
grzemich 0:d7bd7384a37c 658 #if LWIP_NETIF_HWADDRHINT
grzemich 0:d7bd7384a37c 659 netif->addr_hint = &(pcb->addr_hint);
grzemich 0:d7bd7384a37c 660 #endif /* LWIP_NETIF_HWADDRHINT*/
grzemich 0:d7bd7384a37c 661 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
grzemich 0:d7bd7384a37c 662 #if LWIP_NETIF_HWADDRHINT
grzemich 0:d7bd7384a37c 663 netif->addr_hint = NULL;
grzemich 0:d7bd7384a37c 664 #endif /* LWIP_NETIF_HWADDRHINT*/
grzemich 0:d7bd7384a37c 665 }
grzemich 0:d7bd7384a37c 666 /* TODO: must this be increased even if error occured? */
grzemich 0:d7bd7384a37c 667 snmp_inc_udpoutdatagrams();
grzemich 0:d7bd7384a37c 668
grzemich 0:d7bd7384a37c 669 /* did we chain a separate header pbuf earlier? */
grzemich 0:d7bd7384a37c 670 if (q != p) {
grzemich 0:d7bd7384a37c 671 /* free the header pbuf */
grzemich 0:d7bd7384a37c 672 pbuf_free(q);
grzemich 0:d7bd7384a37c 673 q = NULL;
grzemich 0:d7bd7384a37c 674 /* p is still referenced by the caller, and will live on */
grzemich 0:d7bd7384a37c 675 }
grzemich 0:d7bd7384a37c 676
grzemich 0:d7bd7384a37c 677 UDP_STATS_INC(udp.xmit);
grzemich 0:d7bd7384a37c 678 return err;
grzemich 0:d7bd7384a37c 679 }
grzemich 0:d7bd7384a37c 680
grzemich 0:d7bd7384a37c 681 /**
grzemich 0:d7bd7384a37c 682 * Bind an UDP PCB.
grzemich 0:d7bd7384a37c 683 *
grzemich 0:d7bd7384a37c 684 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
grzemich 0:d7bd7384a37c 685 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
grzemich 0:d7bd7384a37c 686 * bind to all local interfaces.
grzemich 0:d7bd7384a37c 687 * @param port local UDP port to bind with. Use 0 to automatically bind
grzemich 0:d7bd7384a37c 688 * to a random port between UDP_LOCAL_PORT_RANGE_START and
grzemich 0:d7bd7384a37c 689 * UDP_LOCAL_PORT_RANGE_END.
grzemich 0:d7bd7384a37c 690 *
grzemich 0:d7bd7384a37c 691 * ipaddr & port are expected to be in the same byte order as in the pcb.
grzemich 0:d7bd7384a37c 692 *
grzemich 0:d7bd7384a37c 693 * @return lwIP error code.
grzemich 0:d7bd7384a37c 694 * - ERR_OK. Successful. No error occured.
grzemich 0:d7bd7384a37c 695 * - ERR_USE. The specified ipaddr and port are already bound to by
grzemich 0:d7bd7384a37c 696 * another UDP PCB.
grzemich 0:d7bd7384a37c 697 *
grzemich 0:d7bd7384a37c 698 * @see udp_disconnect()
grzemich 0:d7bd7384a37c 699 */
grzemich 0:d7bd7384a37c 700 err_t
grzemich 0:d7bd7384a37c 701 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
grzemich 0:d7bd7384a37c 702 {
grzemich 0:d7bd7384a37c 703 struct udp_pcb *ipcb;
grzemich 0:d7bd7384a37c 704 u8_t rebind;
grzemich 0:d7bd7384a37c 705
grzemich 0:d7bd7384a37c 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
grzemich 0:d7bd7384a37c 707 ip_addr_debug_print(UDP_DEBUG, ipaddr);
grzemich 0:d7bd7384a37c 708 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
grzemich 0:d7bd7384a37c 709
grzemich 0:d7bd7384a37c 710 rebind = 0;
grzemich 0:d7bd7384a37c 711 /* Check for double bind and rebind of the same pcb */
grzemich 0:d7bd7384a37c 712 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
grzemich 0:d7bd7384a37c 713 /* is this UDP PCB already on active list? */
grzemich 0:d7bd7384a37c 714 if (pcb == ipcb) {
grzemich 0:d7bd7384a37c 715 /* pcb may occur at most once in active list */
grzemich 0:d7bd7384a37c 716 LWIP_ASSERT("rebind == 0", rebind == 0);
grzemich 0:d7bd7384a37c 717 /* pcb already in list, just rebind */
grzemich 0:d7bd7384a37c 718 rebind = 1;
grzemich 0:d7bd7384a37c 719 }
grzemich 0:d7bd7384a37c 720
grzemich 0:d7bd7384a37c 721 /* By default, we don't allow to bind to a port that any other udp
grzemich 0:d7bd7384a37c 722 PCB is alread bound to, unless *all* PCBs with that port have tha
grzemich 0:d7bd7384a37c 723 REUSEADDR flag set. */
grzemich 0:d7bd7384a37c 724 #if SO_REUSE
grzemich 0:d7bd7384a37c 725 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
grzemich 0:d7bd7384a37c 726 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
grzemich 0:d7bd7384a37c 727 #else /* SO_REUSE */
grzemich 0:d7bd7384a37c 728 /* port matches that of PCB in list and REUSEADDR not set -> reject */
grzemich 0:d7bd7384a37c 729 else {
grzemich 0:d7bd7384a37c 730 #endif /* SO_REUSE */
grzemich 0:d7bd7384a37c 731 if ((ipcb->local_port == port) &&
grzemich 0:d7bd7384a37c 732 /* IP address matches, or one is IP_ADDR_ANY? */
grzemich 0:d7bd7384a37c 733 (ip_addr_isany(&(ipcb->local_ip)) ||
grzemich 0:d7bd7384a37c 734 ip_addr_isany(ipaddr) ||
grzemich 0:d7bd7384a37c 735 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
grzemich 0:d7bd7384a37c 736 /* other PCB already binds to this local IP and port */
grzemich 0:d7bd7384a37c 737 LWIP_DEBUGF(UDP_DEBUG,
grzemich 0:d7bd7384a37c 738 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
grzemich 0:d7bd7384a37c 739 return ERR_USE;
grzemich 0:d7bd7384a37c 740 }
grzemich 0:d7bd7384a37c 741 }
grzemich 0:d7bd7384a37c 742 }
grzemich 0:d7bd7384a37c 743
grzemich 0:d7bd7384a37c 744 ip_addr_set(&pcb->local_ip, ipaddr);
grzemich 0:d7bd7384a37c 745
grzemich 0:d7bd7384a37c 746 /* no port specified? */
grzemich 0:d7bd7384a37c 747 if (port == 0) {
grzemich 0:d7bd7384a37c 748 #ifndef UDP_LOCAL_PORT_RANGE_START
grzemich 0:d7bd7384a37c 749 /* From http://www.iana.org/assignments/port-numbers:
grzemich 0:d7bd7384a37c 750 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
grzemich 0:d7bd7384a37c 751 #define UDP_LOCAL_PORT_RANGE_START 0xc000
grzemich 0:d7bd7384a37c 752 #define UDP_LOCAL_PORT_RANGE_END 0xffff
grzemich 0:d7bd7384a37c 753 #endif
grzemich 0:d7bd7384a37c 754 port = UDP_LOCAL_PORT_RANGE_START;
grzemich 0:d7bd7384a37c 755 ipcb = udp_pcbs;
grzemich 0:d7bd7384a37c 756 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
grzemich 0:d7bd7384a37c 757 if (ipcb->local_port == port) {
grzemich 0:d7bd7384a37c 758 /* port is already used by another udp_pcb */
grzemich 0:d7bd7384a37c 759 port++;
grzemich 0:d7bd7384a37c 760 /* restart scanning all udp pcbs */
grzemich 0:d7bd7384a37c 761 ipcb = udp_pcbs;
grzemich 0:d7bd7384a37c 762 } else {
grzemich 0:d7bd7384a37c 763 /* go on with next udp pcb */
grzemich 0:d7bd7384a37c 764 ipcb = ipcb->next;
grzemich 0:d7bd7384a37c 765 }
grzemich 0:d7bd7384a37c 766 }
grzemich 0:d7bd7384a37c 767 if (ipcb != NULL) {
grzemich 0:d7bd7384a37c 768 /* no more ports available in local range */
grzemich 0:d7bd7384a37c 769 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
grzemich 0:d7bd7384a37c 770 return ERR_USE;
grzemich 0:d7bd7384a37c 771 }
grzemich 0:d7bd7384a37c 772 }
grzemich 0:d7bd7384a37c 773 pcb->local_port = port;
grzemich 0:d7bd7384a37c 774 snmp_insert_udpidx_tree(pcb);
grzemich 0:d7bd7384a37c 775 /* pcb not active yet? */
grzemich 0:d7bd7384a37c 776 if (rebind == 0) {
grzemich 0:d7bd7384a37c 777 /* place the PCB on the active list if not already there */
grzemich 0:d7bd7384a37c 778 pcb->next = udp_pcbs;
grzemich 0:d7bd7384a37c 779 udp_pcbs = pcb;
grzemich 0:d7bd7384a37c 780 }
grzemich 0:d7bd7384a37c 781 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 782 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
grzemich 0:d7bd7384a37c 783 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
grzemich 0:d7bd7384a37c 784 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
grzemich 0:d7bd7384a37c 785 pcb->local_port));
grzemich 0:d7bd7384a37c 786 return ERR_OK;
grzemich 0:d7bd7384a37c 787 }
grzemich 0:d7bd7384a37c 788 /**
grzemich 0:d7bd7384a37c 789 * Connect an UDP PCB.
grzemich 0:d7bd7384a37c 790 *
grzemich 0:d7bd7384a37c 791 * This will associate the UDP PCB with the remote address.
grzemich 0:d7bd7384a37c 792 *
grzemich 0:d7bd7384a37c 793 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
grzemich 0:d7bd7384a37c 794 * @param ipaddr remote IP address to connect with.
grzemich 0:d7bd7384a37c 795 * @param port remote UDP port to connect with.
grzemich 0:d7bd7384a37c 796 *
grzemich 0:d7bd7384a37c 797 * @return lwIP error code
grzemich 0:d7bd7384a37c 798 *
grzemich 0:d7bd7384a37c 799 * ipaddr & port are expected to be in the same byte order as in the pcb.
grzemich 0:d7bd7384a37c 800 *
grzemich 0:d7bd7384a37c 801 * The udp pcb is bound to a random local port if not already bound.
grzemich 0:d7bd7384a37c 802 *
grzemich 0:d7bd7384a37c 803 * @see udp_disconnect()
grzemich 0:d7bd7384a37c 804 */
grzemich 0:d7bd7384a37c 805 err_t
grzemich 0:d7bd7384a37c 806 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
grzemich 0:d7bd7384a37c 807 {
grzemich 0:d7bd7384a37c 808 struct udp_pcb *ipcb;
grzemich 0:d7bd7384a37c 809
grzemich 0:d7bd7384a37c 810 if (pcb->local_port == 0) {
grzemich 0:d7bd7384a37c 811 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
grzemich 0:d7bd7384a37c 812 if (err != ERR_OK) {
grzemich 0:d7bd7384a37c 813 return err;
grzemich 0:d7bd7384a37c 814 }
grzemich 0:d7bd7384a37c 815 }
grzemich 0:d7bd7384a37c 816
grzemich 0:d7bd7384a37c 817 ip_addr_set(&pcb->remote_ip, ipaddr);
grzemich 0:d7bd7384a37c 818 pcb->remote_port = port;
grzemich 0:d7bd7384a37c 819 pcb->flags |= UDP_FLAGS_CONNECTED;
grzemich 0:d7bd7384a37c 820 /** TODO: this functionality belongs in upper layers */
grzemich 0:d7bd7384a37c 821 #ifdef LWIP_UDP_TODO
grzemich 0:d7bd7384a37c 822 /* Nail down local IP for netconn_addr()/getsockname() */
grzemich 0:d7bd7384a37c 823 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
grzemich 0:d7bd7384a37c 824 struct netif *netif;
grzemich 0:d7bd7384a37c 825
grzemich 0:d7bd7384a37c 826 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
grzemich 0:d7bd7384a37c 827 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
grzemich 0:d7bd7384a37c 828 UDP_STATS_INC(udp.rterr);
grzemich 0:d7bd7384a37c 829 return ERR_RTE;
grzemich 0:d7bd7384a37c 830 }
grzemich 0:d7bd7384a37c 831 /** TODO: this will bind the udp pcb locally, to the interface which
grzemich 0:d7bd7384a37c 832 is used to route output packets to the remote address. However, we
grzemich 0:d7bd7384a37c 833 might want to accept incoming packets on any interface! */
grzemich 0:d7bd7384a37c 834 pcb->local_ip = netif->ip_addr;
grzemich 0:d7bd7384a37c 835 } else if (ip_addr_isany(&pcb->remote_ip)) {
grzemich 0:d7bd7384a37c 836 pcb->local_ip.addr = 0;
grzemich 0:d7bd7384a37c 837 }
grzemich 0:d7bd7384a37c 838 #endif
grzemich 0:d7bd7384a37c 839 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 840 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
grzemich 0:d7bd7384a37c 841 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
grzemich 0:d7bd7384a37c 842 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
grzemich 0:d7bd7384a37c 843 pcb->local_port));
grzemich 0:d7bd7384a37c 844
grzemich 0:d7bd7384a37c 845 /* Insert UDP PCB into the list of active UDP PCBs. */
grzemich 0:d7bd7384a37c 846 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
grzemich 0:d7bd7384a37c 847 if (pcb == ipcb) {
grzemich 0:d7bd7384a37c 848 /* already on the list, just return */
grzemich 0:d7bd7384a37c 849 return ERR_OK;
grzemich 0:d7bd7384a37c 850 }
grzemich 0:d7bd7384a37c 851 }
grzemich 0:d7bd7384a37c 852 /* PCB not yet on the list, add PCB now */
grzemich 0:d7bd7384a37c 853 pcb->next = udp_pcbs;
grzemich 0:d7bd7384a37c 854 udp_pcbs = pcb;
grzemich 0:d7bd7384a37c 855 return ERR_OK;
grzemich 0:d7bd7384a37c 856 }
grzemich 0:d7bd7384a37c 857
grzemich 0:d7bd7384a37c 858 /**
grzemich 0:d7bd7384a37c 859 * Disconnect a UDP PCB
grzemich 0:d7bd7384a37c 860 *
grzemich 0:d7bd7384a37c 861 * @param pcb the udp pcb to disconnect.
grzemich 0:d7bd7384a37c 862 */
grzemich 0:d7bd7384a37c 863 void
grzemich 0:d7bd7384a37c 864 udp_disconnect(struct udp_pcb *pcb)
grzemich 0:d7bd7384a37c 865 {
grzemich 0:d7bd7384a37c 866 /* reset remote address association */
grzemich 0:d7bd7384a37c 867 ip_addr_set_any(&pcb->remote_ip);
grzemich 0:d7bd7384a37c 868 pcb->remote_port = 0;
grzemich 0:d7bd7384a37c 869 /* mark PCB as unconnected */
grzemich 0:d7bd7384a37c 870 pcb->flags &= ~UDP_FLAGS_CONNECTED;
grzemich 0:d7bd7384a37c 871 }
grzemich 0:d7bd7384a37c 872
grzemich 0:d7bd7384a37c 873 /**
grzemich 0:d7bd7384a37c 874 * Set a receive callback for a UDP PCB
grzemich 0:d7bd7384a37c 875 *
grzemich 0:d7bd7384a37c 876 * This callback will be called when receiving a datagram for the pcb.
grzemich 0:d7bd7384a37c 877 *
grzemich 0:d7bd7384a37c 878 * @param pcb the pcb for wich to set the recv callback
grzemich 0:d7bd7384a37c 879 * @param recv function pointer of the callback function
grzemich 0:d7bd7384a37c 880 * @param recv_arg additional argument to pass to the callback function
grzemich 0:d7bd7384a37c 881 */
grzemich 0:d7bd7384a37c 882 void
grzemich 0:d7bd7384a37c 883 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
grzemich 0:d7bd7384a37c 884 {
grzemich 0:d7bd7384a37c 885 /* remember recv() callback and user data */
grzemich 0:d7bd7384a37c 886 pcb->recv = recv;
grzemich 0:d7bd7384a37c 887 pcb->recv_arg = recv_arg;
grzemich 0:d7bd7384a37c 888 }
grzemich 0:d7bd7384a37c 889
grzemich 0:d7bd7384a37c 890 /**
grzemich 0:d7bd7384a37c 891 * Remove an UDP PCB.
grzemich 0:d7bd7384a37c 892 *
grzemich 0:d7bd7384a37c 893 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
grzemich 0:d7bd7384a37c 894 * UDP PCB's and the data structure is freed from memory.
grzemich 0:d7bd7384a37c 895 *
grzemich 0:d7bd7384a37c 896 * @see udp_new()
grzemich 0:d7bd7384a37c 897 */
grzemich 0:d7bd7384a37c 898 void
grzemich 0:d7bd7384a37c 899 udp_remove(struct udp_pcb *pcb)
grzemich 0:d7bd7384a37c 900 {
grzemich 0:d7bd7384a37c 901 struct udp_pcb *pcb2;
grzemich 0:d7bd7384a37c 902
grzemich 0:d7bd7384a37c 903 snmp_delete_udpidx_tree(pcb);
grzemich 0:d7bd7384a37c 904 /* pcb to be removed is first in list? */
grzemich 0:d7bd7384a37c 905 if (udp_pcbs == pcb) {
grzemich 0:d7bd7384a37c 906 /* make list start at 2nd pcb */
grzemich 0:d7bd7384a37c 907 udp_pcbs = udp_pcbs->next;
grzemich 0:d7bd7384a37c 908 /* pcb not 1st in list */
grzemich 0:d7bd7384a37c 909 } else {
grzemich 0:d7bd7384a37c 910 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
grzemich 0:d7bd7384a37c 911 /* find pcb in udp_pcbs list */
grzemich 0:d7bd7384a37c 912 if (pcb2->next != NULL && pcb2->next == pcb) {
grzemich 0:d7bd7384a37c 913 /* remove pcb from list */
grzemich 0:d7bd7384a37c 914 pcb2->next = pcb->next;
grzemich 0:d7bd7384a37c 915 }
grzemich 0:d7bd7384a37c 916 }
grzemich 0:d7bd7384a37c 917 }
grzemich 0:d7bd7384a37c 918 memp_free(MEMP_UDP_PCB, pcb);
grzemich 0:d7bd7384a37c 919 }
grzemich 0:d7bd7384a37c 920
grzemich 0:d7bd7384a37c 921 /**
grzemich 0:d7bd7384a37c 922 * Create a UDP PCB.
grzemich 0:d7bd7384a37c 923 *
grzemich 0:d7bd7384a37c 924 * @return The UDP PCB which was created. NULL if the PCB data structure
grzemich 0:d7bd7384a37c 925 * could not be allocated.
grzemich 0:d7bd7384a37c 926 *
grzemich 0:d7bd7384a37c 927 * @see udp_remove()
grzemich 0:d7bd7384a37c 928 */
grzemich 0:d7bd7384a37c 929 struct udp_pcb *
grzemich 0:d7bd7384a37c 930 udp_new(void)
grzemich 0:d7bd7384a37c 931 {
grzemich 0:d7bd7384a37c 932 struct udp_pcb *pcb;
grzemich 0:d7bd7384a37c 933 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
grzemich 0:d7bd7384a37c 934 /* could allocate UDP PCB? */
grzemich 0:d7bd7384a37c 935 if (pcb != NULL) {
grzemich 0:d7bd7384a37c 936 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
grzemich 0:d7bd7384a37c 937 * which means checksum is generated over the whole datagram per default
grzemich 0:d7bd7384a37c 938 * (recommended as default by RFC 3828). */
grzemich 0:d7bd7384a37c 939 /* initialize PCB to all zeroes */
grzemich 0:d7bd7384a37c 940 memset(pcb, 0, sizeof(struct udp_pcb));
grzemich 0:d7bd7384a37c 941 pcb->ttl = UDP_TTL;
grzemich 0:d7bd7384a37c 942 }
grzemich 0:d7bd7384a37c 943 return pcb;
grzemich 0:d7bd7384a37c 944 }
grzemich 0:d7bd7384a37c 945
grzemich 0:d7bd7384a37c 946 #if UDP_DEBUG
grzemich 0:d7bd7384a37c 947 /**
grzemich 0:d7bd7384a37c 948 * Print UDP header information for debug purposes.
grzemich 0:d7bd7384a37c 949 *
grzemich 0:d7bd7384a37c 950 * @param udphdr pointer to the udp header in memory.
grzemich 0:d7bd7384a37c 951 */
grzemich 0:d7bd7384a37c 952 void
grzemich 0:d7bd7384a37c 953 udp_debug_print(struct udp_hdr *udphdr)
grzemich 0:d7bd7384a37c 954 {
grzemich 0:d7bd7384a37c 955 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
grzemich 0:d7bd7384a37c 956 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 957 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
grzemich 0:d7bd7384a37c 958 ntohs(udphdr->src), ntohs(udphdr->dest)));
grzemich 0:d7bd7384a37c 959 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 960 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
grzemich 0:d7bd7384a37c 961 ntohs(udphdr->len), ntohs(udphdr->chksum)));
grzemich 0:d7bd7384a37c 962 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
grzemich 0:d7bd7384a37c 963 }
grzemich 0:d7bd7384a37c 964 #endif /* UDP_DEBUG */
grzemich 0:d7bd7384a37c 965
grzemich 0:d7bd7384a37c 966 #endif /* LWIP_UDP */