Wayne Jay / EthernetInterface

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lwip/core/udp.c@0:b2805b6888dc, 2016-06-20 (annotated)

Committer:
robert_jw
Date:
Mon Jun 20 01:40:20 2016 +0000
Revision:
0:b2805b6888dc
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
robert_jw 0:b2805b6888dc 1 /**
robert_jw 0:b2805b6888dc 2 * @file
robert_jw 0:b2805b6888dc 3 * User Datagram Protocol module
robert_jw 0:b2805b6888dc 4 *
robert_jw 0:b2805b6888dc 5 */
robert_jw 0:b2805b6888dc 6
robert_jw 0:b2805b6888dc 7 /*
robert_jw 0:b2805b6888dc 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
robert_jw 0:b2805b6888dc 9 * All rights reserved.
robert_jw 0:b2805b6888dc 10 *
robert_jw 0:b2805b6888dc 11 * Redistribution and use in source and binary forms, with or without modification,
robert_jw 0:b2805b6888dc 12 * are permitted provided that the following conditions are met:
robert_jw 0:b2805b6888dc 13 *
robert_jw 0:b2805b6888dc 14 * 1. Redistributions of source code must retain the above copyright notice,
robert_jw 0:b2805b6888dc 15 * this list of conditions and the following disclaimer.
robert_jw 0:b2805b6888dc 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
robert_jw 0:b2805b6888dc 17 * this list of conditions and the following disclaimer in the documentation
robert_jw 0:b2805b6888dc 18 * and/or other materials provided with the distribution.
robert_jw 0:b2805b6888dc 19 * 3. The name of the author may not be used to endorse or promote products
robert_jw 0:b2805b6888dc 20 * derived from this software without specific prior written permission.
robert_jw 0:b2805b6888dc 21 *
robert_jw 0:b2805b6888dc 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
robert_jw 0:b2805b6888dc 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
robert_jw 0:b2805b6888dc 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
robert_jw 0:b2805b6888dc 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
robert_jw 0:b2805b6888dc 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
robert_jw 0:b2805b6888dc 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
robert_jw 0:b2805b6888dc 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
robert_jw 0:b2805b6888dc 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
robert_jw 0:b2805b6888dc 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
robert_jw 0:b2805b6888dc 31 * OF SUCH DAMAGE.
robert_jw 0:b2805b6888dc 32 *
robert_jw 0:b2805b6888dc 33 * This file is part of the lwIP TCP/IP stack.
robert_jw 0:b2805b6888dc 34 *
robert_jw 0:b2805b6888dc 35 * Author: Adam Dunkels <adam@sics.se>
robert_jw 0:b2805b6888dc 36 *
robert_jw 0:b2805b6888dc 37 */
robert_jw 0:b2805b6888dc 38
robert_jw 0:b2805b6888dc 39
robert_jw 0:b2805b6888dc 40 /* udp.c
robert_jw 0:b2805b6888dc 41 *
robert_jw 0:b2805b6888dc 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
robert_jw 0:b2805b6888dc 43 *
robert_jw 0:b2805b6888dc 44 */
robert_jw 0:b2805b6888dc 45
robert_jw 0:b2805b6888dc 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
robert_jw 0:b2805b6888dc 47 */
robert_jw 0:b2805b6888dc 48
robert_jw 0:b2805b6888dc 49 #include "lwip/opt.h"
robert_jw 0:b2805b6888dc 50
robert_jw 0:b2805b6888dc 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
robert_jw 0:b2805b6888dc 52
robert_jw 0:b2805b6888dc 53 #include "lwip/udp.h"
robert_jw 0:b2805b6888dc 54 #include "lwip/def.h"
robert_jw 0:b2805b6888dc 55 #include "lwip/memp.h"
robert_jw 0:b2805b6888dc 56 #include "lwip/inet_chksum.h"
robert_jw 0:b2805b6888dc 57 #include "lwip/ip_addr.h"
robert_jw 0:b2805b6888dc 58 #include "lwip/netif.h"
robert_jw 0:b2805b6888dc 59 #include "lwip/icmp.h"
robert_jw 0:b2805b6888dc 60 #include "lwip/stats.h"
robert_jw 0:b2805b6888dc 61 #include "lwip/snmp.h"
robert_jw 0:b2805b6888dc 62 #include "arch/perf.h"
robert_jw 0:b2805b6888dc 63 #include "lwip/dhcp.h"
robert_jw 0:b2805b6888dc 64
robert_jw 0:b2805b6888dc 65 #include <string.h>
robert_jw 0:b2805b6888dc 66
robert_jw 0:b2805b6888dc 67 /* The list of UDP PCBs */
robert_jw 0:b2805b6888dc 68 /* exported in udp.h (was static) */
robert_jw 0:b2805b6888dc 69 struct udp_pcb *udp_pcbs;
robert_jw 0:b2805b6888dc 70
robert_jw 0:b2805b6888dc 71 /**
robert_jw 0:b2805b6888dc 72 * Process an incoming UDP datagram.
robert_jw 0:b2805b6888dc 73 *
robert_jw 0:b2805b6888dc 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
robert_jw 0:b2805b6888dc 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
robert_jw 0:b2805b6888dc 76 * recv function. If no pcb is found or the datagram is incorrect, the
robert_jw 0:b2805b6888dc 77 * pbuf is freed.
robert_jw 0:b2805b6888dc 78 *
robert_jw 0:b2805b6888dc 79 * @param p pbuf to be demultiplexed to a UDP PCB.
robert_jw 0:b2805b6888dc 80 * @param inp network interface on which the datagram was received.
robert_jw 0:b2805b6888dc 81 *
robert_jw 0:b2805b6888dc 82 */
robert_jw 0:b2805b6888dc 83 void
robert_jw 0:b2805b6888dc 84 udp_input(struct pbuf *p, struct netif *inp)
robert_jw 0:b2805b6888dc 85 {
robert_jw 0:b2805b6888dc 86 struct udp_hdr *udphdr;
robert_jw 0:b2805b6888dc 87 struct udp_pcb *pcb, *prev;
robert_jw 0:b2805b6888dc 88 struct udp_pcb *uncon_pcb;
robert_jw 0:b2805b6888dc 89 struct ip_hdr *iphdr;
robert_jw 0:b2805b6888dc 90 u16_t src, dest;
robert_jw 0:b2805b6888dc 91 u8_t local_match;
robert_jw 0:b2805b6888dc 92 u8_t broadcast;
robert_jw 0:b2805b6888dc 93
robert_jw 0:b2805b6888dc 94 PERF_START;
robert_jw 0:b2805b6888dc 95
robert_jw 0:b2805b6888dc 96 UDP_STATS_INC(udp.recv);
robert_jw 0:b2805b6888dc 97
robert_jw 0:b2805b6888dc 98 iphdr = (struct ip_hdr *)p->payload;
robert_jw 0:b2805b6888dc 99
robert_jw 0:b2805b6888dc 100 /* Check minimum length (IP header + UDP header)
robert_jw 0:b2805b6888dc 101 * and move payload pointer to UDP header */
robert_jw 0:b2805b6888dc 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
robert_jw 0:b2805b6888dc 103 /* drop short packets */
robert_jw 0:b2805b6888dc 104 LWIP_DEBUGF(UDP_DEBUG,
robert_jw 0:b2805b6888dc 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
robert_jw 0:b2805b6888dc 106 UDP_STATS_INC(udp.lenerr);
robert_jw 0:b2805b6888dc 107 UDP_STATS_INC(udp.drop);
robert_jw 0:b2805b6888dc 108 snmp_inc_udpinerrors();
robert_jw 0:b2805b6888dc 109 pbuf_free(p);
robert_jw 0:b2805b6888dc 110 goto end;
robert_jw 0:b2805b6888dc 111 }
robert_jw 0:b2805b6888dc 112
robert_jw 0:b2805b6888dc 113 udphdr = (struct udp_hdr *)p->payload;
robert_jw 0:b2805b6888dc 114
robert_jw 0:b2805b6888dc 115 /* is broadcast packet ? */
robert_jw 0:b2805b6888dc 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
robert_jw 0:b2805b6888dc 117
robert_jw 0:b2805b6888dc 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
robert_jw 0:b2805b6888dc 119
robert_jw 0:b2805b6888dc 120 /* convert src and dest ports to host byte order */
robert_jw 0:b2805b6888dc 121 src = ntohs(udphdr->src);
robert_jw 0:b2805b6888dc 122 dest = ntohs(udphdr->dest);
robert_jw 0:b2805b6888dc 123
robert_jw 0:b2805b6888dc 124 udp_debug_print(udphdr);
robert_jw 0:b2805b6888dc 125
robert_jw 0:b2805b6888dc 126 /* print the UDP source and destination */
robert_jw 0:b2805b6888dc 127 LWIP_DEBUGF(UDP_DEBUG,
robert_jw 0:b2805b6888dc 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
robert_jw 0:b2805b6888dc 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
robert_jw 0:b2805b6888dc 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
robert_jw 0:b2805b6888dc 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
robert_jw 0:b2805b6888dc 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
robert_jw 0:b2805b6888dc 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
robert_jw 0:b2805b6888dc 134
robert_jw 0:b2805b6888dc 135 #if LWIP_DHCP
robert_jw 0:b2805b6888dc 136 pcb = NULL;
robert_jw 0:b2805b6888dc 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
robert_jw 0:b2805b6888dc 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
robert_jw 0:b2805b6888dc 139 if (dest == DHCP_CLIENT_PORT) {
robert_jw 0:b2805b6888dc 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
robert_jw 0:b2805b6888dc 141 if (src == DHCP_SERVER_PORT) {
robert_jw 0:b2805b6888dc 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
robert_jw 0:b2805b6888dc 143 /* accept the packe if
robert_jw 0:b2805b6888dc 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
robert_jw 0:b2805b6888dc 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
robert_jw 0:b2805b6888dc 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
robert_jw 0:b2805b6888dc 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
robert_jw 0:b2805b6888dc 148 pcb = inp->dhcp->pcb;
robert_jw 0:b2805b6888dc 149 }
robert_jw 0:b2805b6888dc 150 }
robert_jw 0:b2805b6888dc 151 }
robert_jw 0:b2805b6888dc 152 } else
robert_jw 0:b2805b6888dc 153 #endif /* LWIP_DHCP */
robert_jw 0:b2805b6888dc 154 {
robert_jw 0:b2805b6888dc 155 prev = NULL;
robert_jw 0:b2805b6888dc 156 local_match = 0;
robert_jw 0:b2805b6888dc 157 uncon_pcb = NULL;
robert_jw 0:b2805b6888dc 158 /* Iterate through the UDP pcb list for a matching pcb.
robert_jw 0:b2805b6888dc 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
robert_jw 0:b2805b6888dc 160 * preferred. If no perfect match is found, the first unconnected pcb that
robert_jw 0:b2805b6888dc 161 * matches the local port and ip address gets the datagram. */
robert_jw 0:b2805b6888dc 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
robert_jw 0:b2805b6888dc 163 local_match = 0;
robert_jw 0:b2805b6888dc 164 /* print the PCB local and remote address */
robert_jw 0:b2805b6888dc 165 LWIP_DEBUGF(UDP_DEBUG,
robert_jw 0:b2805b6888dc 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
robert_jw 0:b2805b6888dc 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
robert_jw 0:b2805b6888dc 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
robert_jw 0:b2805b6888dc 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
robert_jw 0:b2805b6888dc 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
robert_jw 0:b2805b6888dc 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
robert_jw 0:b2805b6888dc 172
robert_jw 0:b2805b6888dc 173 /* compare PCB local addr+port to UDP destination addr+port */
robert_jw 0:b2805b6888dc 174 if ((pcb->local_port == dest) &&
robert_jw 0:b2805b6888dc 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
robert_jw 0:b2805b6888dc 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
robert_jw 0:b2805b6888dc 177 #if LWIP_IGMP
robert_jw 0:b2805b6888dc 178 ip_addr_ismulticast(&current_iphdr_dest) ||
robert_jw 0:b2805b6888dc 179 #endif /* LWIP_IGMP */
robert_jw 0:b2805b6888dc 180 #if IP_SOF_BROADCAST_RECV
robert_jw 0:b2805b6888dc 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
robert_jw 0:b2805b6888dc 182 #else /* IP_SOF_BROADCAST_RECV */
robert_jw 0:b2805b6888dc 183 (broadcast))) {
robert_jw 0:b2805b6888dc 184 #endif /* IP_SOF_BROADCAST_RECV */
robert_jw 0:b2805b6888dc 185 local_match = 1;
robert_jw 0:b2805b6888dc 186 if ((uncon_pcb == NULL) &&
robert_jw 0:b2805b6888dc 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
robert_jw 0:b2805b6888dc 188 /* the first unconnected matching PCB */
robert_jw 0:b2805b6888dc 189 uncon_pcb = pcb;
robert_jw 0:b2805b6888dc 190 }
robert_jw 0:b2805b6888dc 191 }
robert_jw 0:b2805b6888dc 192 /* compare PCB remote addr+port to UDP source addr+port */
robert_jw 0:b2805b6888dc 193 if ((local_match != 0) &&
robert_jw 0:b2805b6888dc 194 (pcb->remote_port == src) &&
robert_jw 0:b2805b6888dc 195 (ip_addr_isany(&pcb->remote_ip) ||
robert_jw 0:b2805b6888dc 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
robert_jw 0:b2805b6888dc 197 /* the first fully matching PCB */
robert_jw 0:b2805b6888dc 198 if (prev != NULL) {
robert_jw 0:b2805b6888dc 199 /* move the pcb to the front of udp_pcbs so that is
robert_jw 0:b2805b6888dc 200 found faster next time */
robert_jw 0:b2805b6888dc 201 prev->next = pcb->next;
robert_jw 0:b2805b6888dc 202 pcb->next = udp_pcbs;
robert_jw 0:b2805b6888dc 203 udp_pcbs = pcb;
robert_jw 0:b2805b6888dc 204 } else {
robert_jw 0:b2805b6888dc 205 UDP_STATS_INC(udp.cachehit);
robert_jw 0:b2805b6888dc 206 }
robert_jw 0:b2805b6888dc 207 break;
robert_jw 0:b2805b6888dc 208 }
robert_jw 0:b2805b6888dc 209 prev = pcb;
robert_jw 0:b2805b6888dc 210 }
robert_jw 0:b2805b6888dc 211 /* no fully matching pcb found? then look for an unconnected pcb */
robert_jw 0:b2805b6888dc 212 if (pcb == NULL) {
robert_jw 0:b2805b6888dc 213 pcb = uncon_pcb;
robert_jw 0:b2805b6888dc 214 }
robert_jw 0:b2805b6888dc 215 }
robert_jw 0:b2805b6888dc 216
robert_jw 0:b2805b6888dc 217 /* Check checksum if this is a match or if it was directed at us. */
robert_jw 0:b2805b6888dc 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
robert_jw 0:b2805b6888dc 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
robert_jw 0:b2805b6888dc 220 #if LWIP_UDPLITE
robert_jw 0:b2805b6888dc 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
robert_jw 0:b2805b6888dc 222 /* Do the UDP Lite checksum */
robert_jw 0:b2805b6888dc 223 #if CHECKSUM_CHECK_UDP
robert_jw 0:b2805b6888dc 224 u16_t chklen = ntohs(udphdr->len);
robert_jw 0:b2805b6888dc 225 if (chklen < sizeof(struct udp_hdr)) {
robert_jw 0:b2805b6888dc 226 if (chklen == 0) {
robert_jw 0:b2805b6888dc 227 /* For UDP-Lite, checksum length of 0 means checksum
robert_jw 0:b2805b6888dc 228 over the complete packet (See RFC 3828 chap. 3.1) */
robert_jw 0:b2805b6888dc 229 chklen = p->tot_len;
robert_jw 0:b2805b6888dc 230 } else {
robert_jw 0:b2805b6888dc 231 /* At least the UDP-Lite header must be covered by the
robert_jw 0:b2805b6888dc 232 checksum! (Again, see RFC 3828 chap. 3.1) */
robert_jw 0:b2805b6888dc 233 UDP_STATS_INC(udp.chkerr);
robert_jw 0:b2805b6888dc 234 UDP_STATS_INC(udp.drop);
robert_jw 0:b2805b6888dc 235 snmp_inc_udpinerrors();
robert_jw 0:b2805b6888dc 236 pbuf_free(p);
robert_jw 0:b2805b6888dc 237 goto end;
robert_jw 0:b2805b6888dc 238 }
robert_jw 0:b2805b6888dc 239 }
robert_jw 0:b2805b6888dc 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
robert_jw 0:b2805b6888dc 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
robert_jw 0:b2805b6888dc 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
robert_jw 0:b2805b6888dc 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
robert_jw 0:b2805b6888dc 244 UDP_STATS_INC(udp.chkerr);
robert_jw 0:b2805b6888dc 245 UDP_STATS_INC(udp.drop);
robert_jw 0:b2805b6888dc 246 snmp_inc_udpinerrors();
robert_jw 0:b2805b6888dc 247 pbuf_free(p);
robert_jw 0:b2805b6888dc 248 goto end;
robert_jw 0:b2805b6888dc 249 }
robert_jw 0:b2805b6888dc 250 #endif /* CHECKSUM_CHECK_UDP */
robert_jw 0:b2805b6888dc 251 } else
robert_jw 0:b2805b6888dc 252 #endif /* LWIP_UDPLITE */
robert_jw 0:b2805b6888dc 253 {
robert_jw 0:b2805b6888dc 254 #if CHECKSUM_CHECK_UDP
robert_jw 0:b2805b6888dc 255 if (udphdr->chksum != 0) {
robert_jw 0:b2805b6888dc 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
robert_jw 0:b2805b6888dc 257 IP_PROTO_UDP, p->tot_len) != 0) {
robert_jw 0:b2805b6888dc 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
robert_jw 0:b2805b6888dc 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
robert_jw 0:b2805b6888dc 260 UDP_STATS_INC(udp.chkerr);
robert_jw 0:b2805b6888dc 261 UDP_STATS_INC(udp.drop);
robert_jw 0:b2805b6888dc 262 snmp_inc_udpinerrors();
robert_jw 0:b2805b6888dc 263 pbuf_free(p);
robert_jw 0:b2805b6888dc 264 goto end;
robert_jw 0:b2805b6888dc 265 }
robert_jw 0:b2805b6888dc 266 }
robert_jw 0:b2805b6888dc 267 #endif /* CHECKSUM_CHECK_UDP */
robert_jw 0:b2805b6888dc 268 }
robert_jw 0:b2805b6888dc 269 if(pbuf_header(p, -UDP_HLEN)) {
robert_jw 0:b2805b6888dc 270 /* Can we cope with this failing? Just assert for now */
robert_jw 0:b2805b6888dc 271 LWIP_ASSERT("pbuf_header failed\n", 0);
robert_jw 0:b2805b6888dc 272 UDP_STATS_INC(udp.drop);
robert_jw 0:b2805b6888dc 273 snmp_inc_udpinerrors();
robert_jw 0:b2805b6888dc 274 pbuf_free(p);
robert_jw 0:b2805b6888dc 275 goto end;
robert_jw 0:b2805b6888dc 276 }
robert_jw 0:b2805b6888dc 277 if (pcb != NULL) {
robert_jw 0:b2805b6888dc 278 snmp_inc_udpindatagrams();
robert_jw 0:b2805b6888dc 279 #if SO_REUSE && SO_REUSE_RXTOALL
robert_jw 0:b2805b6888dc 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
robert_jw 0:b2805b6888dc 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
robert_jw 0:b2805b6888dc 282 /* pass broadcast- or multicast packets to all multicast pcbs
robert_jw 0:b2805b6888dc 283 if SOF_REUSEADDR is set on the first match */
robert_jw 0:b2805b6888dc 284 struct udp_pcb *mpcb;
robert_jw 0:b2805b6888dc 285 u8_t p_header_changed = 0;
robert_jw 0:b2805b6888dc 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
robert_jw 0:b2805b6888dc 287 if (mpcb != pcb) {
robert_jw 0:b2805b6888dc 288 /* compare PCB local addr+port to UDP destination addr+port */
robert_jw 0:b2805b6888dc 289 if ((mpcb->local_port == dest) &&
robert_jw 0:b2805b6888dc 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
robert_jw 0:b2805b6888dc 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
robert_jw 0:b2805b6888dc 292 #if LWIP_IGMP
robert_jw 0:b2805b6888dc 293 ip_addr_ismulticast(&current_iphdr_dest) ||
robert_jw 0:b2805b6888dc 294 #endif /* LWIP_IGMP */
robert_jw 0:b2805b6888dc 295 #if IP_SOF_BROADCAST_RECV
robert_jw 0:b2805b6888dc 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
robert_jw 0:b2805b6888dc 297 #else /* IP_SOF_BROADCAST_RECV */
robert_jw 0:b2805b6888dc 298 (broadcast))) {
robert_jw 0:b2805b6888dc 299 #endif /* IP_SOF_BROADCAST_RECV */
robert_jw 0:b2805b6888dc 300 /* pass a copy of the packet to all local matches */
robert_jw 0:b2805b6888dc 301 if (mpcb->recv != NULL) {
robert_jw 0:b2805b6888dc 302 struct pbuf *q;
robert_jw 0:b2805b6888dc 303 /* for that, move payload to IP header again */
robert_jw 0:b2805b6888dc 304 if (p_header_changed == 0) {
robert_jw 0:b2805b6888dc 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
robert_jw 0:b2805b6888dc 306 p_header_changed = 1;
robert_jw 0:b2805b6888dc 307 }
robert_jw 0:b2805b6888dc 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
robert_jw 0:b2805b6888dc 309 if (q != NULL) {
robert_jw 0:b2805b6888dc 310 err_t err = pbuf_copy(q, p);
robert_jw 0:b2805b6888dc 311 if (err == ERR_OK) {
robert_jw 0:b2805b6888dc 312 /* move payload to UDP data */
robert_jw 0:b2805b6888dc 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
robert_jw 0:b2805b6888dc 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
robert_jw 0:b2805b6888dc 315 }
robert_jw 0:b2805b6888dc 316 }
robert_jw 0:b2805b6888dc 317 }
robert_jw 0:b2805b6888dc 318 }
robert_jw 0:b2805b6888dc 319 }
robert_jw 0:b2805b6888dc 320 }
robert_jw 0:b2805b6888dc 321 if (p_header_changed) {
robert_jw 0:b2805b6888dc 322 /* and move payload to UDP data again */
robert_jw 0:b2805b6888dc 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
robert_jw 0:b2805b6888dc 324 }
robert_jw 0:b2805b6888dc 325 }
robert_jw 0:b2805b6888dc 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
robert_jw 0:b2805b6888dc 327 /* callback */
robert_jw 0:b2805b6888dc 328 if (pcb->recv != NULL) {
robert_jw 0:b2805b6888dc 329 /* now the recv function is responsible for freeing p */
robert_jw 0:b2805b6888dc 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
robert_jw 0:b2805b6888dc 331 } else {
robert_jw 0:b2805b6888dc 332 /* no recv function registered? then we have to free the pbuf! */
robert_jw 0:b2805b6888dc 333 pbuf_free(p);
robert_jw 0:b2805b6888dc 334 goto end;
robert_jw 0:b2805b6888dc 335 }
robert_jw 0:b2805b6888dc 336 } else {
robert_jw 0:b2805b6888dc 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
robert_jw 0:b2805b6888dc 338
robert_jw 0:b2805b6888dc 339 #if LWIP_ICMP
robert_jw 0:b2805b6888dc 340 /* No match was found, send ICMP destination port unreachable unless
robert_jw 0:b2805b6888dc 341 destination address was broadcast/multicast. */
robert_jw 0:b2805b6888dc 342 if (!broadcast &&
robert_jw 0:b2805b6888dc 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
robert_jw 0:b2805b6888dc 344 /* move payload pointer back to ip header */
robert_jw 0:b2805b6888dc 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
robert_jw 0:b2805b6888dc 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
robert_jw 0:b2805b6888dc 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
robert_jw 0:b2805b6888dc 348 }
robert_jw 0:b2805b6888dc 349 #endif /* LWIP_ICMP */
robert_jw 0:b2805b6888dc 350 UDP_STATS_INC(udp.proterr);
robert_jw 0:b2805b6888dc 351 UDP_STATS_INC(udp.drop);
robert_jw 0:b2805b6888dc 352 snmp_inc_udpnoports();
robert_jw 0:b2805b6888dc 353 pbuf_free(p);
robert_jw 0:b2805b6888dc 354 }
robert_jw 0:b2805b6888dc 355 } else {
robert_jw 0:b2805b6888dc 356 pbuf_free(p);
robert_jw 0:b2805b6888dc 357 }
robert_jw 0:b2805b6888dc 358 end:
robert_jw 0:b2805b6888dc 359 PERF_STOP("udp_input");
robert_jw 0:b2805b6888dc 360 }
robert_jw 0:b2805b6888dc 361
robert_jw 0:b2805b6888dc 362 /**
robert_jw 0:b2805b6888dc 363 * Send data using UDP.
robert_jw 0:b2805b6888dc 364 *
robert_jw 0:b2805b6888dc 365 * @param pcb UDP PCB used to send the data.
robert_jw 0:b2805b6888dc 366 * @param p chain of pbuf's to be sent.
robert_jw 0:b2805b6888dc 367 *
robert_jw 0:b2805b6888dc 368 * The datagram will be sent to the current remote_ip & remote_port
robert_jw 0:b2805b6888dc 369 * stored in pcb. If the pcb is not bound to a port, it will
robert_jw 0:b2805b6888dc 370 * automatically be bound to a random port.
robert_jw 0:b2805b6888dc 371 *
robert_jw 0:b2805b6888dc 372 * @return lwIP error code.
robert_jw 0:b2805b6888dc 373 * - ERR_OK. Successful. No error occured.
robert_jw 0:b2805b6888dc 374 * - ERR_MEM. Out of memory.
robert_jw 0:b2805b6888dc 375 * - ERR_RTE. Could not find route to destination address.
robert_jw 0:b2805b6888dc 376 * - More errors could be returned by lower protocol layers.
robert_jw 0:b2805b6888dc 377 *
robert_jw 0:b2805b6888dc 378 * @see udp_disconnect() udp_sendto()
robert_jw 0:b2805b6888dc 379 */
robert_jw 0:b2805b6888dc 380 err_t
robert_jw 0:b2805b6888dc 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
robert_jw 0:b2805b6888dc 382 {
robert_jw 0:b2805b6888dc 383 /* send to the packet using remote ip and port stored in the pcb */
robert_jw 0:b2805b6888dc 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
robert_jw 0:b2805b6888dc 385 }
robert_jw 0:b2805b6888dc 386
robert_jw 0:b2805b6888dc 387 #if LWIP_CHECKSUM_ON_COPY
robert_jw 0:b2805b6888dc 388 /** Same as udp_send() but with checksum
robert_jw 0:b2805b6888dc 389 */
robert_jw 0:b2805b6888dc 390 err_t
robert_jw 0:b2805b6888dc 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
robert_jw 0:b2805b6888dc 392 u8_t have_chksum, u16_t chksum)
robert_jw 0:b2805b6888dc 393 {
robert_jw 0:b2805b6888dc 394 /* send to the packet using remote ip and port stored in the pcb */
robert_jw 0:b2805b6888dc 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
robert_jw 0:b2805b6888dc 396 have_chksum, chksum);
robert_jw 0:b2805b6888dc 397 }
robert_jw 0:b2805b6888dc 398 #endif /* LWIP_CHECKSUM_ON_COPY */
robert_jw 0:b2805b6888dc 399
robert_jw 0:b2805b6888dc 400 /**
robert_jw 0:b2805b6888dc 401 * Send data to a specified address using UDP.
robert_jw 0:b2805b6888dc 402 *
robert_jw 0:b2805b6888dc 403 * @param pcb UDP PCB used to send the data.
robert_jw 0:b2805b6888dc 404 * @param p chain of pbuf's to be sent.
robert_jw 0:b2805b6888dc 405 * @param dst_ip Destination IP address.
robert_jw 0:b2805b6888dc 406 * @param dst_port Destination UDP port.
robert_jw 0:b2805b6888dc 407 *
robert_jw 0:b2805b6888dc 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
robert_jw 0:b2805b6888dc 409 *
robert_jw 0:b2805b6888dc 410 * If the PCB already has a remote address association, it will
robert_jw 0:b2805b6888dc 411 * be restored after the data is sent.
robert_jw 0:b2805b6888dc 412 *
robert_jw 0:b2805b6888dc 413 * @return lwIP error code (@see udp_send for possible error codes)
robert_jw 0:b2805b6888dc 414 *
robert_jw 0:b2805b6888dc 415 * @see udp_disconnect() udp_send()
robert_jw 0:b2805b6888dc 416 */
robert_jw 0:b2805b6888dc 417 err_t
robert_jw 0:b2805b6888dc 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
robert_jw 0:b2805b6888dc 419 ip_addr_t *dst_ip, u16_t dst_port)
robert_jw 0:b2805b6888dc 420 {
robert_jw 0:b2805b6888dc 421 #if LWIP_CHECKSUM_ON_COPY
robert_jw 0:b2805b6888dc 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
robert_jw 0:b2805b6888dc 423 }
robert_jw 0:b2805b6888dc 424
robert_jw 0:b2805b6888dc 425 /** Same as udp_sendto(), but with checksum */
robert_jw 0:b2805b6888dc 426 err_t
robert_jw 0:b2805b6888dc 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
robert_jw 0:b2805b6888dc 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
robert_jw 0:b2805b6888dc 429 {
robert_jw 0:b2805b6888dc 430 #endif /* LWIP_CHECKSUM_ON_COPY */
robert_jw 0:b2805b6888dc 431 struct netif *netif;
robert_jw 0:b2805b6888dc 432
robert_jw 0:b2805b6888dc 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
robert_jw 0:b2805b6888dc 434
robert_jw 0:b2805b6888dc 435 /* find the outgoing network interface for this packet */
robert_jw 0:b2805b6888dc 436 #if LWIP_IGMP
robert_jw 0:b2805b6888dc 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
robert_jw 0:b2805b6888dc 438 #else
robert_jw 0:b2805b6888dc 439 netif = ip_route(dst_ip);
robert_jw 0:b2805b6888dc 440 #endif /* LWIP_IGMP */
robert_jw 0:b2805b6888dc 441
robert_jw 0:b2805b6888dc 442 /* no outgoing network interface could be found? */
robert_jw 0:b2805b6888dc 443 if (netif == NULL) {
robert_jw 0:b2805b6888dc 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
robert_jw 0:b2805b6888dc 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
robert_jw 0:b2805b6888dc 446 UDP_STATS_INC(udp.rterr);
robert_jw 0:b2805b6888dc 447 return ERR_RTE;
robert_jw 0:b2805b6888dc 448 }
robert_jw 0:b2805b6888dc 449 #if LWIP_CHECKSUM_ON_COPY
robert_jw 0:b2805b6888dc 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
robert_jw 0:b2805b6888dc 451 #else /* LWIP_CHECKSUM_ON_COPY */
robert_jw 0:b2805b6888dc 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
robert_jw 0:b2805b6888dc 453 #endif /* LWIP_CHECKSUM_ON_COPY */
robert_jw 0:b2805b6888dc 454 }
robert_jw 0:b2805b6888dc 455
robert_jw 0:b2805b6888dc 456 /**
robert_jw 0:b2805b6888dc 457 * Send data to a specified address using UDP.
robert_jw 0:b2805b6888dc 458 * The netif used for sending can be specified.
robert_jw 0:b2805b6888dc 459 *
robert_jw 0:b2805b6888dc 460 * This function exists mainly for DHCP, to be able to send UDP packets
robert_jw 0:b2805b6888dc 461 * on a netif that is still down.
robert_jw 0:b2805b6888dc 462 *
robert_jw 0:b2805b6888dc 463 * @param pcb UDP PCB used to send the data.
robert_jw 0:b2805b6888dc 464 * @param p chain of pbuf's to be sent.
robert_jw 0:b2805b6888dc 465 * @param dst_ip Destination IP address.
robert_jw 0:b2805b6888dc 466 * @param dst_port Destination UDP port.
robert_jw 0:b2805b6888dc 467 * @param netif the netif used for sending.
robert_jw 0:b2805b6888dc 468 *
robert_jw 0:b2805b6888dc 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
robert_jw 0:b2805b6888dc 470 *
robert_jw 0:b2805b6888dc 471 * @return lwIP error code (@see udp_send for possible error codes)
robert_jw 0:b2805b6888dc 472 *
robert_jw 0:b2805b6888dc 473 * @see udp_disconnect() udp_send()
robert_jw 0:b2805b6888dc 474 */
robert_jw 0:b2805b6888dc 475 err_t
robert_jw 0:b2805b6888dc 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
robert_jw 0:b2805b6888dc 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
robert_jw 0:b2805b6888dc 478 {
robert_jw 0:b2805b6888dc 479 #if LWIP_CHECKSUM_ON_COPY
robert_jw 0:b2805b6888dc 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
robert_jw 0:b2805b6888dc 481 }
robert_jw 0:b2805b6888dc 482
robert_jw 0:b2805b6888dc 483 /** Same as udp_sendto_if(), but with checksum */
robert_jw 0:b2805b6888dc 484 err_t
robert_jw 0:b2805b6888dc 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
robert_jw 0:b2805b6888dc 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
robert_jw 0:b2805b6888dc 487 u16_t chksum)
robert_jw 0:b2805b6888dc 488 {
robert_jw 0:b2805b6888dc 489 #endif /* LWIP_CHECKSUM_ON_COPY */
robert_jw 0:b2805b6888dc 490 struct udp_hdr *udphdr;
robert_jw 0:b2805b6888dc 491 ip_addr_t *src_ip;
robert_jw 0:b2805b6888dc 492 err_t err;
robert_jw 0:b2805b6888dc 493 struct pbuf *q; /* q will be sent down the stack */
robert_jw 0:b2805b6888dc 494
robert_jw 0:b2805b6888dc 495 #if IP_SOF_BROADCAST
robert_jw 0:b2805b6888dc 496 /* broadcast filter? */
robert_jw 0:b2805b6888dc 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
robert_jw 0:b2805b6888dc 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
robert_jw 0:b2805b6888dc 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
robert_jw 0:b2805b6888dc 500 return ERR_VAL;
robert_jw 0:b2805b6888dc 501 }
robert_jw 0:b2805b6888dc 502 #endif /* IP_SOF_BROADCAST */
robert_jw 0:b2805b6888dc 503
robert_jw 0:b2805b6888dc 504 /* if the PCB is not yet bound to a port, bind it here */
robert_jw 0:b2805b6888dc 505 if (pcb->local_port == 0) {
robert_jw 0:b2805b6888dc 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
robert_jw 0:b2805b6888dc 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
robert_jw 0:b2805b6888dc 508 if (err != ERR_OK) {
robert_jw 0:b2805b6888dc 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
robert_jw 0:b2805b6888dc 510 return err;
robert_jw 0:b2805b6888dc 511 }
robert_jw 0:b2805b6888dc 512 }
robert_jw 0:b2805b6888dc 513
robert_jw 0:b2805b6888dc 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
robert_jw 0:b2805b6888dc 515 if (pbuf_header(p, UDP_HLEN)) {
robert_jw 0:b2805b6888dc 516 /* allocate header in a separate new pbuf */
robert_jw 0:b2805b6888dc 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
robert_jw 0:b2805b6888dc 518 /* new header pbuf could not be allocated? */
robert_jw 0:b2805b6888dc 519 if (q == NULL) {
robert_jw 0:b2805b6888dc 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
robert_jw 0:b2805b6888dc 521 return ERR_MEM;
robert_jw 0:b2805b6888dc 522 }
robert_jw 0:b2805b6888dc 523 if (p->tot_len != 0) {
robert_jw 0:b2805b6888dc 524 /* chain header q in front of given pbuf p (only if p contains data) */
robert_jw 0:b2805b6888dc 525 pbuf_chain(q, p);
robert_jw 0:b2805b6888dc 526 }
robert_jw 0:b2805b6888dc 527 /* first pbuf q points to header pbuf */
robert_jw 0:b2805b6888dc 528 LWIP_DEBUGF(UDP_DEBUG,
robert_jw 0:b2805b6888dc 529 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
robert_jw 0:b2805b6888dc 530 } else {
robert_jw 0:b2805b6888dc 531 /* adding space for header within p succeeded */
robert_jw 0:b2805b6888dc 532 /* first pbuf q equals given pbuf */
robert_jw 0:b2805b6888dc 533 q = p;
robert_jw 0:b2805b6888dc 534 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
robert_jw 0:b2805b6888dc 535 }
robert_jw 0:b2805b6888dc 536 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
robert_jw 0:b2805b6888dc 537 (q->len >= sizeof(struct udp_hdr)));
robert_jw 0:b2805b6888dc 538 /* q now represents the packet to be sent */
robert_jw 0:b2805b6888dc 539 udphdr = (struct udp_hdr *)q->payload;
robert_jw 0:b2805b6888dc 540 udphdr->src = htons(pcb->local_port);
robert_jw 0:b2805b6888dc 541 udphdr->dest = htons(dst_port);
robert_jw 0:b2805b6888dc 542 /* in UDP, 0 checksum means 'no checksum' */
robert_jw 0:b2805b6888dc 543 udphdr->chksum = 0x0000;
robert_jw 0:b2805b6888dc 544
robert_jw 0:b2805b6888dc 545 /* Multicast Loop? */
robert_jw 0:b2805b6888dc 546 #if LWIP_IGMP
robert_jw 0:b2805b6888dc 547 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
robert_jw 0:b2805b6888dc 548 q->flags |= PBUF_FLAG_MCASTLOOP;
robert_jw 0:b2805b6888dc 549 }
robert_jw 0:b2805b6888dc 550 #endif /* LWIP_IGMP */
robert_jw 0:b2805b6888dc 551
robert_jw 0:b2805b6888dc 552
robert_jw 0:b2805b6888dc 553 /* PCB local address is IP_ANY_ADDR? */
robert_jw 0:b2805b6888dc 554 if (ip_addr_isany(&pcb->local_ip)) {
robert_jw 0:b2805b6888dc 555 /* use outgoing network interface IP address as source address */
robert_jw 0:b2805b6888dc 556 src_ip = &(netif->ip_addr);
robert_jw 0:b2805b6888dc 557 } else {
robert_jw 0:b2805b6888dc 558 /* check if UDP PCB local IP address is correct
robert_jw 0:b2805b6888dc 559 * this could be an old address if netif->ip_addr has changed */
robert_jw 0:b2805b6888dc 560 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
robert_jw 0:b2805b6888dc 561 /* local_ip doesn't match, drop the packet */
robert_jw 0:b2805b6888dc 562 if (q != p) {
robert_jw 0:b2805b6888dc 563 /* free the header pbuf */
robert_jw 0:b2805b6888dc 564 pbuf_free(q);
robert_jw 0:b2805b6888dc 565 q = NULL;
robert_jw 0:b2805b6888dc 566 /* p is still referenced by the caller, and will live on */
robert_jw 0:b2805b6888dc 567 }
robert_jw 0:b2805b6888dc 568 return ERR_VAL;
robert_jw 0:b2805b6888dc 569 }
robert_jw 0:b2805b6888dc 570 /* use UDP PCB local IP address as source address */
robert_jw 0:b2805b6888dc 571 src_ip = &(pcb->local_ip);
robert_jw 0:b2805b6888dc 572 }
robert_jw 0:b2805b6888dc 573
robert_jw 0:b2805b6888dc 574 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
robert_jw 0:b2805b6888dc 575
robert_jw 0:b2805b6888dc 576 #if LWIP_UDPLITE
robert_jw 0:b2805b6888dc 577 /* UDP Lite protocol? */
robert_jw 0:b2805b6888dc 578 if (pcb->flags & UDP_FLAGS_UDPLITE) {
robert_jw 0:b2805b6888dc 579 u16_t chklen, chklen_hdr;
robert_jw 0:b2805b6888dc 580 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
robert_jw 0:b2805b6888dc 581 /* set UDP message length in UDP header */
robert_jw 0:b2805b6888dc 582 chklen_hdr = chklen = pcb->chksum_len_tx;
robert_jw 0:b2805b6888dc 583 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
robert_jw 0:b2805b6888dc 584 if (chklen != 0) {
robert_jw 0:b2805b6888dc 585 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
robert_jw 0:b2805b6888dc 586 }
robert_jw 0:b2805b6888dc 587 /* For UDP-Lite, checksum length of 0 means checksum
robert_jw 0:b2805b6888dc 588 over the complete packet. (See RFC 3828 chap. 3.1)
robert_jw 0:b2805b6888dc 589 At least the UDP-Lite header must be covered by the
robert_jw 0:b2805b6888dc 590 checksum, therefore, if chksum_len has an illegal
robert_jw 0:b2805b6888dc 591 value, we generate the checksum over the complete
robert_jw 0:b2805b6888dc 592 packet to be safe. */
robert_jw 0:b2805b6888dc 593 chklen_hdr = 0;
robert_jw 0:b2805b6888dc 594 chklen = q->tot_len;
robert_jw 0:b2805b6888dc 595 }
robert_jw 0:b2805b6888dc 596 udphdr->len = htons(chklen_hdr);
robert_jw 0:b2805b6888dc 597 /* calculate checksum */
robert_jw 0:b2805b6888dc 598 #if CHECKSUM_GEN_UDP
robert_jw 0:b2805b6888dc 599 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
robert_jw 0:b2805b6888dc 600 IP_PROTO_UDPLITE, q->tot_len,
robert_jw 0:b2805b6888dc 601 #if !LWIP_CHECKSUM_ON_COPY
robert_jw 0:b2805b6888dc 602 chklen);
robert_jw 0:b2805b6888dc 603 #else /* !LWIP_CHECKSUM_ON_COPY */
robert_jw 0:b2805b6888dc 604 (have_chksum ? UDP_HLEN : chklen));
robert_jw 0:b2805b6888dc 605 if (have_chksum) {
robert_jw 0:b2805b6888dc 606 u32_t acc;
robert_jw 0:b2805b6888dc 607 acc = udphdr->chksum + (u16_t)~(chksum);
robert_jw 0:b2805b6888dc 608 udphdr->chksum = FOLD_U32T(acc);
robert_jw 0:b2805b6888dc 609 }
robert_jw 0:b2805b6888dc 610 #endif /* !LWIP_CHECKSUM_ON_COPY */
robert_jw 0:b2805b6888dc 611
robert_jw 0:b2805b6888dc 612 /* chksum zero must become 0xffff, as zero means 'no checksum' */
robert_jw 0:b2805b6888dc 613 if (udphdr->chksum == 0x0000) {
robert_jw 0:b2805b6888dc 614 udphdr->chksum = 0xffff;
robert_jw 0:b2805b6888dc 615 }
robert_jw 0:b2805b6888dc 616 #endif /* CHECKSUM_GEN_UDP */
robert_jw 0:b2805b6888dc 617 /* output to IP */
robert_jw 0:b2805b6888dc 618 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
robert_jw 0:b2805b6888dc 619 #if LWIP_NETIF_HWADDRHINT
robert_jw 0:b2805b6888dc 620 netif->addr_hint = &(pcb->addr_hint);
robert_jw 0:b2805b6888dc 621 #endif /* LWIP_NETIF_HWADDRHINT*/
robert_jw 0:b2805b6888dc 622 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
robert_jw 0:b2805b6888dc 623 #if LWIP_NETIF_HWADDRHINT
robert_jw 0:b2805b6888dc 624 netif->addr_hint = NULL;
robert_jw 0:b2805b6888dc 625 #endif /* LWIP_NETIF_HWADDRHINT*/
robert_jw 0:b2805b6888dc 626 } else
robert_jw 0:b2805b6888dc 627 #endif /* LWIP_UDPLITE */
robert_jw 0:b2805b6888dc 628 { /* UDP */
robert_jw 0:b2805b6888dc 629 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
robert_jw 0:b2805b6888dc 630 udphdr->len = htons(q->tot_len);
robert_jw 0:b2805b6888dc 631 /* calculate checksum */
robert_jw 0:b2805b6888dc 632 #if CHECKSUM_GEN_UDP
robert_jw 0:b2805b6888dc 633 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
robert_jw 0:b2805b6888dc 634 u16_t udpchksum;
robert_jw 0:b2805b6888dc 635 #if LWIP_CHECKSUM_ON_COPY
robert_jw 0:b2805b6888dc 636 if (have_chksum) {
robert_jw 0:b2805b6888dc 637 u32_t acc;
robert_jw 0:b2805b6888dc 638 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
robert_jw 0:b2805b6888dc 639 q->tot_len, UDP_HLEN);
robert_jw 0:b2805b6888dc 640 acc = udpchksum + (u16_t)~(chksum);
robert_jw 0:b2805b6888dc 641 udpchksum = FOLD_U32T(acc);
robert_jw 0:b2805b6888dc 642 } else
robert_jw 0:b2805b6888dc 643 #endif /* LWIP_CHECKSUM_ON_COPY */
robert_jw 0:b2805b6888dc 644 {
robert_jw 0:b2805b6888dc 645 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
robert_jw 0:b2805b6888dc 646 }
robert_jw 0:b2805b6888dc 647
robert_jw 0:b2805b6888dc 648 /* chksum zero must become 0xffff, as zero means 'no checksum' */
robert_jw 0:b2805b6888dc 649 if (udpchksum == 0x0000) {
robert_jw 0:b2805b6888dc 650 udpchksum = 0xffff;
robert_jw 0:b2805b6888dc 651 }
robert_jw 0:b2805b6888dc 652 udphdr->chksum = udpchksum;
robert_jw 0:b2805b6888dc 653 }
robert_jw 0:b2805b6888dc 654 #endif /* CHECKSUM_GEN_UDP */
robert_jw 0:b2805b6888dc 655 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
robert_jw 0:b2805b6888dc 656 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
robert_jw 0:b2805b6888dc 657 /* output to IP */
robert_jw 0:b2805b6888dc 658 #if LWIP_NETIF_HWADDRHINT
robert_jw 0:b2805b6888dc 659 netif->addr_hint = &(pcb->addr_hint);
robert_jw 0:b2805b6888dc 660 #endif /* LWIP_NETIF_HWADDRHINT*/
robert_jw 0:b2805b6888dc 661 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
robert_jw 0:b2805b6888dc 662 #if LWIP_NETIF_HWADDRHINT
robert_jw 0:b2805b6888dc 663 netif->addr_hint = NULL;
robert_jw 0:b2805b6888dc 664 #endif /* LWIP_NETIF_HWADDRHINT*/
robert_jw 0:b2805b6888dc 665 }
robert_jw 0:b2805b6888dc 666 /* TODO: must this be increased even if error occured? */
robert_jw 0:b2805b6888dc 667 snmp_inc_udpoutdatagrams();
robert_jw 0:b2805b6888dc 668
robert_jw 0:b2805b6888dc 669 /* did we chain a separate header pbuf earlier? */
robert_jw 0:b2805b6888dc 670 if (q != p) {
robert_jw 0:b2805b6888dc 671 /* free the header pbuf */
robert_jw 0:b2805b6888dc 672 pbuf_free(q);
robert_jw 0:b2805b6888dc 673 q = NULL;
robert_jw 0:b2805b6888dc 674 /* p is still referenced by the caller, and will live on */
robert_jw 0:b2805b6888dc 675 }
robert_jw 0:b2805b6888dc 676
robert_jw 0:b2805b6888dc 677 UDP_STATS_INC(udp.xmit);
robert_jw 0:b2805b6888dc 678 return err;
robert_jw 0:b2805b6888dc 679 }
robert_jw 0:b2805b6888dc 680
robert_jw 0:b2805b6888dc 681 /**
robert_jw 0:b2805b6888dc 682 * Bind an UDP PCB.
robert_jw 0:b2805b6888dc 683 *
robert_jw 0:b2805b6888dc 684 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
robert_jw 0:b2805b6888dc 685 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
robert_jw 0:b2805b6888dc 686 * bind to all local interfaces.
robert_jw 0:b2805b6888dc 687 * @param port local UDP port to bind with. Use 0 to automatically bind
robert_jw 0:b2805b6888dc 688 * to a random port between UDP_LOCAL_PORT_RANGE_START and
robert_jw 0:b2805b6888dc 689 * UDP_LOCAL_PORT_RANGE_END.
robert_jw 0:b2805b6888dc 690 *
robert_jw 0:b2805b6888dc 691 * ipaddr & port are expected to be in the same byte order as in the pcb.
robert_jw 0:b2805b6888dc 692 *
robert_jw 0:b2805b6888dc 693 * @return lwIP error code.
robert_jw 0:b2805b6888dc 694 * - ERR_OK. Successful. No error occured.
robert_jw 0:b2805b6888dc 695 * - ERR_USE. The specified ipaddr and port are already bound to by
robert_jw 0:b2805b6888dc 696 * another UDP PCB.
robert_jw 0:b2805b6888dc 697 *
robert_jw 0:b2805b6888dc 698 * @see udp_disconnect()
robert_jw 0:b2805b6888dc 699 */
robert_jw 0:b2805b6888dc 700 err_t
robert_jw 0:b2805b6888dc 701 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
robert_jw 0:b2805b6888dc 702 {
robert_jw 0:b2805b6888dc 703 struct udp_pcb *ipcb;
robert_jw 0:b2805b6888dc 704 u8_t rebind;
robert_jw 0:b2805b6888dc 705
robert_jw 0:b2805b6888dc 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
robert_jw 0:b2805b6888dc 707 ip_addr_debug_print(UDP_DEBUG, ipaddr);
robert_jw 0:b2805b6888dc 708 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
robert_jw 0:b2805b6888dc 709
robert_jw 0:b2805b6888dc 710 rebind = 0;
robert_jw 0:b2805b6888dc 711 /* Check for double bind and rebind of the same pcb */
robert_jw 0:b2805b6888dc 712 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
robert_jw 0:b2805b6888dc 713 /* is this UDP PCB already on active list? */
robert_jw 0:b2805b6888dc 714 if (pcb == ipcb) {
robert_jw 0:b2805b6888dc 715 /* pcb may occur at most once in active list */
robert_jw 0:b2805b6888dc 716 LWIP_ASSERT("rebind == 0", rebind == 0);
robert_jw 0:b2805b6888dc 717 /* pcb already in list, just rebind */
robert_jw 0:b2805b6888dc 718 rebind = 1;
robert_jw 0:b2805b6888dc 719 }
robert_jw 0:b2805b6888dc 720
robert_jw 0:b2805b6888dc 721 /* By default, we don't allow to bind to a port that any other udp
robert_jw 0:b2805b6888dc 722 PCB is alread bound to, unless *all* PCBs with that port have tha
robert_jw 0:b2805b6888dc 723 REUSEADDR flag set. */
robert_jw 0:b2805b6888dc 724 #if SO_REUSE
robert_jw 0:b2805b6888dc 725 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
robert_jw 0:b2805b6888dc 726 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
robert_jw 0:b2805b6888dc 727 #else /* SO_REUSE */
robert_jw 0:b2805b6888dc 728 /* port matches that of PCB in list and REUSEADDR not set -> reject */
robert_jw 0:b2805b6888dc 729 else {
robert_jw 0:b2805b6888dc 730 #endif /* SO_REUSE */
robert_jw 0:b2805b6888dc 731 if ((ipcb->local_port == port) &&
robert_jw 0:b2805b6888dc 732 /* IP address matches, or one is IP_ADDR_ANY? */
robert_jw 0:b2805b6888dc 733 (ip_addr_isany(&(ipcb->local_ip)) ||
robert_jw 0:b2805b6888dc 734 ip_addr_isany(ipaddr) ||
robert_jw 0:b2805b6888dc 735 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
robert_jw 0:b2805b6888dc 736 /* other PCB already binds to this local IP and port */
robert_jw 0:b2805b6888dc 737 LWIP_DEBUGF(UDP_DEBUG,
robert_jw 0:b2805b6888dc 738 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
robert_jw 0:b2805b6888dc 739 return ERR_USE;
robert_jw 0:b2805b6888dc 740 }
robert_jw 0:b2805b6888dc 741 }
robert_jw 0:b2805b6888dc 742 }
robert_jw 0:b2805b6888dc 743
robert_jw 0:b2805b6888dc 744 ip_addr_set(&pcb->local_ip, ipaddr);
robert_jw 0:b2805b6888dc 745
robert_jw 0:b2805b6888dc 746 /* no port specified? */
robert_jw 0:b2805b6888dc 747 if (port == 0) {
robert_jw 0:b2805b6888dc 748 #ifndef UDP_LOCAL_PORT_RANGE_START
robert_jw 0:b2805b6888dc 749 /* From http://www.iana.org/assignments/port-numbers:
robert_jw 0:b2805b6888dc 750 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
robert_jw 0:b2805b6888dc 751 #define UDP_LOCAL_PORT_RANGE_START 0xc000
robert_jw 0:b2805b6888dc 752 #define UDP_LOCAL_PORT_RANGE_END 0xffff
robert_jw 0:b2805b6888dc 753 #endif
robert_jw 0:b2805b6888dc 754 port = UDP_LOCAL_PORT_RANGE_START;
robert_jw 0:b2805b6888dc 755 ipcb = udp_pcbs;
robert_jw 0:b2805b6888dc 756 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
robert_jw 0:b2805b6888dc 757 if (ipcb->local_port == port) {
robert_jw 0:b2805b6888dc 758 /* port is already used by another udp_pcb */
robert_jw 0:b2805b6888dc 759 port++;
robert_jw 0:b2805b6888dc 760 /* restart scanning all udp pcbs */
robert_jw 0:b2805b6888dc 761 ipcb = udp_pcbs;
robert_jw 0:b2805b6888dc 762 } else {
robert_jw 0:b2805b6888dc 763 /* go on with next udp pcb */
robert_jw 0:b2805b6888dc 764 ipcb = ipcb->next;
robert_jw 0:b2805b6888dc 765 }
robert_jw 0:b2805b6888dc 766 }
robert_jw 0:b2805b6888dc 767 if (ipcb != NULL) {
robert_jw 0:b2805b6888dc 768 /* no more ports available in local range */
robert_jw 0:b2805b6888dc 769 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
robert_jw 0:b2805b6888dc 770 return ERR_USE;
robert_jw 0:b2805b6888dc 771 }
robert_jw 0:b2805b6888dc 772 }
robert_jw 0:b2805b6888dc 773 pcb->local_port = port;
robert_jw 0:b2805b6888dc 774 snmp_insert_udpidx_tree(pcb);
robert_jw 0:b2805b6888dc 775 /* pcb not active yet? */
robert_jw 0:b2805b6888dc 776 if (rebind == 0) {
robert_jw 0:b2805b6888dc 777 /* place the PCB on the active list if not already there */
robert_jw 0:b2805b6888dc 778 pcb->next = udp_pcbs;
robert_jw 0:b2805b6888dc 779 udp_pcbs = pcb;
robert_jw 0:b2805b6888dc 780 }
robert_jw 0:b2805b6888dc 781 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
robert_jw 0:b2805b6888dc 782 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
robert_jw 0:b2805b6888dc 783 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
robert_jw 0:b2805b6888dc 784 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
robert_jw 0:b2805b6888dc 785 pcb->local_port));
robert_jw 0:b2805b6888dc 786 return ERR_OK;
robert_jw 0:b2805b6888dc 787 }
robert_jw 0:b2805b6888dc 788 /**
robert_jw 0:b2805b6888dc 789 * Connect an UDP PCB.
robert_jw 0:b2805b6888dc 790 *
robert_jw 0:b2805b6888dc 791 * This will associate the UDP PCB with the remote address.
robert_jw 0:b2805b6888dc 792 *
robert_jw 0:b2805b6888dc 793 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
robert_jw 0:b2805b6888dc 794 * @param ipaddr remote IP address to connect with.
robert_jw 0:b2805b6888dc 795 * @param port remote UDP port to connect with.
robert_jw 0:b2805b6888dc 796 *
robert_jw 0:b2805b6888dc 797 * @return lwIP error code
robert_jw 0:b2805b6888dc 798 *
robert_jw 0:b2805b6888dc 799 * ipaddr & port are expected to be in the same byte order as in the pcb.
robert_jw 0:b2805b6888dc 800 *
robert_jw 0:b2805b6888dc 801 * The udp pcb is bound to a random local port if not already bound.
robert_jw 0:b2805b6888dc 802 *
robert_jw 0:b2805b6888dc 803 * @see udp_disconnect()
robert_jw 0:b2805b6888dc 804 */
robert_jw 0:b2805b6888dc 805 err_t
robert_jw 0:b2805b6888dc 806 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
robert_jw 0:b2805b6888dc 807 {
robert_jw 0:b2805b6888dc 808 struct udp_pcb *ipcb;
robert_jw 0:b2805b6888dc 809
robert_jw 0:b2805b6888dc 810 if (pcb->local_port == 0) {
robert_jw 0:b2805b6888dc 811 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
robert_jw 0:b2805b6888dc 812 if (err != ERR_OK) {
robert_jw 0:b2805b6888dc 813 return err;
robert_jw 0:b2805b6888dc 814 }
robert_jw 0:b2805b6888dc 815 }
robert_jw 0:b2805b6888dc 816
robert_jw 0:b2805b6888dc 817 ip_addr_set(&pcb->remote_ip, ipaddr);
robert_jw 0:b2805b6888dc 818 pcb->remote_port = port;
robert_jw 0:b2805b6888dc 819 pcb->flags |= UDP_FLAGS_CONNECTED;
robert_jw 0:b2805b6888dc 820 /** TODO: this functionality belongs in upper layers */
robert_jw 0:b2805b6888dc 821 #ifdef LWIP_UDP_TODO
robert_jw 0:b2805b6888dc 822 /* Nail down local IP for netconn_addr()/getsockname() */
robert_jw 0:b2805b6888dc 823 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
robert_jw 0:b2805b6888dc 824 struct netif *netif;
robert_jw 0:b2805b6888dc 825
robert_jw 0:b2805b6888dc 826 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
robert_jw 0:b2805b6888dc 827 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
robert_jw 0:b2805b6888dc 828 UDP_STATS_INC(udp.rterr);
robert_jw 0:b2805b6888dc 829 return ERR_RTE;
robert_jw 0:b2805b6888dc 830 }
robert_jw 0:b2805b6888dc 831 /** TODO: this will bind the udp pcb locally, to the interface which
robert_jw 0:b2805b6888dc 832 is used to route output packets to the remote address. However, we
robert_jw 0:b2805b6888dc 833 might want to accept incoming packets on any interface! */
robert_jw 0:b2805b6888dc 834 pcb->local_ip = netif->ip_addr;
robert_jw 0:b2805b6888dc 835 } else if (ip_addr_isany(&pcb->remote_ip)) {
robert_jw 0:b2805b6888dc 836 pcb->local_ip.addr = 0;
robert_jw 0:b2805b6888dc 837 }
robert_jw 0:b2805b6888dc 838 #endif
robert_jw 0:b2805b6888dc 839 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
robert_jw 0:b2805b6888dc 840 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
robert_jw 0:b2805b6888dc 841 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
robert_jw 0:b2805b6888dc 842 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
robert_jw 0:b2805b6888dc 843 pcb->local_port));
robert_jw 0:b2805b6888dc 844
robert_jw 0:b2805b6888dc 845 /* Insert UDP PCB into the list of active UDP PCBs. */
robert_jw 0:b2805b6888dc 846 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
robert_jw 0:b2805b6888dc 847 if (pcb == ipcb) {
robert_jw 0:b2805b6888dc 848 /* already on the list, just return */
robert_jw 0:b2805b6888dc 849 return ERR_OK;
robert_jw 0:b2805b6888dc 850 }
robert_jw 0:b2805b6888dc 851 }
robert_jw 0:b2805b6888dc 852 /* PCB not yet on the list, add PCB now */
robert_jw 0:b2805b6888dc 853 pcb->next = udp_pcbs;
robert_jw 0:b2805b6888dc 854 udp_pcbs = pcb;
robert_jw 0:b2805b6888dc 855 return ERR_OK;
robert_jw 0:b2805b6888dc 856 }
robert_jw 0:b2805b6888dc 857
robert_jw 0:b2805b6888dc 858 /**
robert_jw 0:b2805b6888dc 859 * Disconnect a UDP PCB
robert_jw 0:b2805b6888dc 860 *
robert_jw 0:b2805b6888dc 861 * @param pcb the udp pcb to disconnect.
robert_jw 0:b2805b6888dc 862 */
robert_jw 0:b2805b6888dc 863 void
robert_jw 0:b2805b6888dc 864 udp_disconnect(struct udp_pcb *pcb)
robert_jw 0:b2805b6888dc 865 {
robert_jw 0:b2805b6888dc 866 /* reset remote address association */
robert_jw 0:b2805b6888dc 867 ip_addr_set_any(&pcb->remote_ip);
robert_jw 0:b2805b6888dc 868 pcb->remote_port = 0;
robert_jw 0:b2805b6888dc 869 /* mark PCB as unconnected */
robert_jw 0:b2805b6888dc 870 pcb->flags &= ~UDP_FLAGS_CONNECTED;
robert_jw 0:b2805b6888dc 871 }
robert_jw 0:b2805b6888dc 872
robert_jw 0:b2805b6888dc 873 /**
robert_jw 0:b2805b6888dc 874 * Set a receive callback for a UDP PCB
robert_jw 0:b2805b6888dc 875 *
robert_jw 0:b2805b6888dc 876 * This callback will be called when receiving a datagram for the pcb.
robert_jw 0:b2805b6888dc 877 *
robert_jw 0:b2805b6888dc 878 * @param pcb the pcb for wich to set the recv callback
robert_jw 0:b2805b6888dc 879 * @param recv function pointer of the callback function
robert_jw 0:b2805b6888dc 880 * @param recv_arg additional argument to pass to the callback function
robert_jw 0:b2805b6888dc 881 */
robert_jw 0:b2805b6888dc 882 void
robert_jw 0:b2805b6888dc 883 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
robert_jw 0:b2805b6888dc 884 {
robert_jw 0:b2805b6888dc 885 /* remember recv() callback and user data */
robert_jw 0:b2805b6888dc 886 pcb->recv = recv;
robert_jw 0:b2805b6888dc 887 pcb->recv_arg = recv_arg;
robert_jw 0:b2805b6888dc 888 }
robert_jw 0:b2805b6888dc 889
robert_jw 0:b2805b6888dc 890 /**
robert_jw 0:b2805b6888dc 891 * Remove an UDP PCB.
robert_jw 0:b2805b6888dc 892 *
robert_jw 0:b2805b6888dc 893 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
robert_jw 0:b2805b6888dc 894 * UDP PCB's and the data structure is freed from memory.
robert_jw 0:b2805b6888dc 895 *
robert_jw 0:b2805b6888dc 896 * @see udp_new()
robert_jw 0:b2805b6888dc 897 */
robert_jw 0:b2805b6888dc 898 void
robert_jw 0:b2805b6888dc 899 udp_remove(struct udp_pcb *pcb)
robert_jw 0:b2805b6888dc 900 {
robert_jw 0:b2805b6888dc 901 struct udp_pcb *pcb2;
robert_jw 0:b2805b6888dc 902
robert_jw 0:b2805b6888dc 903 snmp_delete_udpidx_tree(pcb);
robert_jw 0:b2805b6888dc 904 /* pcb to be removed is first in list? */
robert_jw 0:b2805b6888dc 905 if (udp_pcbs == pcb) {
robert_jw 0:b2805b6888dc 906 /* make list start at 2nd pcb */
robert_jw 0:b2805b6888dc 907 udp_pcbs = udp_pcbs->next;
robert_jw 0:b2805b6888dc 908 /* pcb not 1st in list */
robert_jw 0:b2805b6888dc 909 } else {
robert_jw 0:b2805b6888dc 910 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
robert_jw 0:b2805b6888dc 911 /* find pcb in udp_pcbs list */
robert_jw 0:b2805b6888dc 912 if (pcb2->next != NULL && pcb2->next == pcb) {
robert_jw 0:b2805b6888dc 913 /* remove pcb from list */
robert_jw 0:b2805b6888dc 914 pcb2->next = pcb->next;
robert_jw 0:b2805b6888dc 915 }
robert_jw 0:b2805b6888dc 916 }
robert_jw 0:b2805b6888dc 917 }
robert_jw 0:b2805b6888dc 918 memp_free(MEMP_UDP_PCB, pcb);
robert_jw 0:b2805b6888dc 919 }
robert_jw 0:b2805b6888dc 920
robert_jw 0:b2805b6888dc 921 /**
robert_jw 0:b2805b6888dc 922 * Create a UDP PCB.
robert_jw 0:b2805b6888dc 923 *
robert_jw 0:b2805b6888dc 924 * @return The UDP PCB which was created. NULL if the PCB data structure
robert_jw 0:b2805b6888dc 925 * could not be allocated.
robert_jw 0:b2805b6888dc 926 *
robert_jw 0:b2805b6888dc 927 * @see udp_remove()
robert_jw 0:b2805b6888dc 928 */
robert_jw 0:b2805b6888dc 929 struct udp_pcb *
robert_jw 0:b2805b6888dc 930 udp_new(void)
robert_jw 0:b2805b6888dc 931 {
robert_jw 0:b2805b6888dc 932 struct udp_pcb *pcb;
robert_jw 0:b2805b6888dc 933 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
robert_jw 0:b2805b6888dc 934 /* could allocate UDP PCB? */
robert_jw 0:b2805b6888dc 935 if (pcb != NULL) {
robert_jw 0:b2805b6888dc 936 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
robert_jw 0:b2805b6888dc 937 * which means checksum is generated over the whole datagram per default
robert_jw 0:b2805b6888dc 938 * (recommended as default by RFC 3828). */
robert_jw 0:b2805b6888dc 939 /* initialize PCB to all zeroes */
robert_jw 0:b2805b6888dc 940 memset(pcb, 0, sizeof(struct udp_pcb));
robert_jw 0:b2805b6888dc 941 pcb->ttl = UDP_TTL;
robert_jw 0:b2805b6888dc 942 }
robert_jw 0:b2805b6888dc 943 return pcb;
robert_jw 0:b2805b6888dc 944 }
robert_jw 0:b2805b6888dc 945
robert_jw 0:b2805b6888dc 946 #if UDP_DEBUG
robert_jw 0:b2805b6888dc 947 /**
robert_jw 0:b2805b6888dc 948 * Print UDP header information for debug purposes.
robert_jw 0:b2805b6888dc 949 *
robert_jw 0:b2805b6888dc 950 * @param udphdr pointer to the udp header in memory.
robert_jw 0:b2805b6888dc 951 */
robert_jw 0:b2805b6888dc 952 void
robert_jw 0:b2805b6888dc 953 udp_debug_print(struct udp_hdr *udphdr)
robert_jw 0:b2805b6888dc 954 {
robert_jw 0:b2805b6888dc 955 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
robert_jw 0:b2805b6888dc 956 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
robert_jw 0:b2805b6888dc 957 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
robert_jw 0:b2805b6888dc 958 ntohs(udphdr->src), ntohs(udphdr->dest)));
robert_jw 0:b2805b6888dc 959 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
robert_jw 0:b2805b6888dc 960 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
robert_jw 0:b2805b6888dc 961 ntohs(udphdr->len), ntohs(udphdr->chksum)));
robert_jw 0:b2805b6888dc 962 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
robert_jw 0:b2805b6888dc 963 }
robert_jw 0:b2805b6888dc 964 #endif /* UDP_DEBUG */
robert_jw 0:b2805b6888dc 965
robert_jw 0:b2805b6888dc 966 #endif /* LWIP_UDP */