孙 毅明 / Mbed 2 deprecated 123

创建mbed

Dependencies:   EthernetInterface SDFileSystem mbed-rtos mbed

EthernetInterface/lwip/core/udp.c@1:6465a3f5c58a, 2018-03-06 (annotated)

Committer:
sunyiming
Date:
Tue Mar 06 08:53:46 2018 +0000
Revision:
1:6465a3f5c58a
??OK

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sunyiming 1:6465a3f5c58a 1 /**
sunyiming 1:6465a3f5c58a 2 * @file
sunyiming 1:6465a3f5c58a 3 * User Datagram Protocol module
sunyiming 1:6465a3f5c58a 4 *
sunyiming 1:6465a3f5c58a 5 */
sunyiming 1:6465a3f5c58a 6
sunyiming 1:6465a3f5c58a 7 /*
sunyiming 1:6465a3f5c58a 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
sunyiming 1:6465a3f5c58a 9 * All rights reserved.
sunyiming 1:6465a3f5c58a 10 *
sunyiming 1:6465a3f5c58a 11 * Redistribution and use in source and binary forms, with or without modification,
sunyiming 1:6465a3f5c58a 12 * are permitted provided that the following conditions are met:
sunyiming 1:6465a3f5c58a 13 *
sunyiming 1:6465a3f5c58a 14 * 1. Redistributions of source code must retain the above copyright notice,
sunyiming 1:6465a3f5c58a 15 * this list of conditions and the following disclaimer.
sunyiming 1:6465a3f5c58a 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
sunyiming 1:6465a3f5c58a 17 * this list of conditions and the following disclaimer in the documentation
sunyiming 1:6465a3f5c58a 18 * and/or other materials provided with the distribution.
sunyiming 1:6465a3f5c58a 19 * 3. The name of the author may not be used to endorse or promote products
sunyiming 1:6465a3f5c58a 20 * derived from this software without specific prior written permission.
sunyiming 1:6465a3f5c58a 21 *
sunyiming 1:6465a3f5c58a 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
sunyiming 1:6465a3f5c58a 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
sunyiming 1:6465a3f5c58a 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
sunyiming 1:6465a3f5c58a 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
sunyiming 1:6465a3f5c58a 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
sunyiming 1:6465a3f5c58a 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
sunyiming 1:6465a3f5c58a 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
sunyiming 1:6465a3f5c58a 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sunyiming 1:6465a3f5c58a 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
sunyiming 1:6465a3f5c58a 31 * OF SUCH DAMAGE.
sunyiming 1:6465a3f5c58a 32 *
sunyiming 1:6465a3f5c58a 33 * This file is part of the lwIP TCP/IP stack.
sunyiming 1:6465a3f5c58a 34 *
sunyiming 1:6465a3f5c58a 35 * Author: Adam Dunkels <adam@sics.se>
sunyiming 1:6465a3f5c58a 36 *
sunyiming 1:6465a3f5c58a 37 */
sunyiming 1:6465a3f5c58a 38
sunyiming 1:6465a3f5c58a 39
sunyiming 1:6465a3f5c58a 40 /* udp.c
sunyiming 1:6465a3f5c58a 41 *
sunyiming 1:6465a3f5c58a 42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
sunyiming 1:6465a3f5c58a 43 *
sunyiming 1:6465a3f5c58a 44 */
sunyiming 1:6465a3f5c58a 45
sunyiming 1:6465a3f5c58a 46 /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
sunyiming 1:6465a3f5c58a 47 */
sunyiming 1:6465a3f5c58a 48
sunyiming 1:6465a3f5c58a 49 #include "lwip/opt.h"
sunyiming 1:6465a3f5c58a 50
sunyiming 1:6465a3f5c58a 51 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
sunyiming 1:6465a3f5c58a 52
sunyiming 1:6465a3f5c58a 53 #include "lwip/udp.h"
sunyiming 1:6465a3f5c58a 54 #include "lwip/def.h"
sunyiming 1:6465a3f5c58a 55 #include "lwip/memp.h"
sunyiming 1:6465a3f5c58a 56 #include "lwip/inet_chksum.h"
sunyiming 1:6465a3f5c58a 57 #include "lwip/ip_addr.h"
sunyiming 1:6465a3f5c58a 58 #include "lwip/netif.h"
sunyiming 1:6465a3f5c58a 59 #include "lwip/icmp.h"
sunyiming 1:6465a3f5c58a 60 #include "lwip/stats.h"
sunyiming 1:6465a3f5c58a 61 #include "lwip/snmp.h"
sunyiming 1:6465a3f5c58a 62 #include "arch/perf.h"
sunyiming 1:6465a3f5c58a 63 #include "lwip/dhcp.h"
sunyiming 1:6465a3f5c58a 64
sunyiming 1:6465a3f5c58a 65 #include <string.h>
sunyiming 1:6465a3f5c58a 66
sunyiming 1:6465a3f5c58a 67 /* The list of UDP PCBs */
sunyiming 1:6465a3f5c58a 68 /* exported in udp.h (was static) */
sunyiming 1:6465a3f5c58a 69 struct udp_pcb *udp_pcbs;
sunyiming 1:6465a3f5c58a 70
sunyiming 1:6465a3f5c58a 71 /**
sunyiming 1:6465a3f5c58a 72 * Process an incoming UDP datagram.
sunyiming 1:6465a3f5c58a 73 *
sunyiming 1:6465a3f5c58a 74 * Given an incoming UDP datagram (as a chain of pbufs) this function
sunyiming 1:6465a3f5c58a 75 * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
sunyiming 1:6465a3f5c58a 76 * recv function. If no pcb is found or the datagram is incorrect, the
sunyiming 1:6465a3f5c58a 77 * pbuf is freed.
sunyiming 1:6465a3f5c58a 78 *
sunyiming 1:6465a3f5c58a 79 * @param p pbuf to be demultiplexed to a UDP PCB.
sunyiming 1:6465a3f5c58a 80 * @param inp network interface on which the datagram was received.
sunyiming 1:6465a3f5c58a 81 *
sunyiming 1:6465a3f5c58a 82 */
sunyiming 1:6465a3f5c58a 83 void
sunyiming 1:6465a3f5c58a 84 udp_input(struct pbuf *p, struct netif *inp)
sunyiming 1:6465a3f5c58a 85 {
sunyiming 1:6465a3f5c58a 86 struct udp_hdr *udphdr;
sunyiming 1:6465a3f5c58a 87 struct udp_pcb *pcb, *prev;
sunyiming 1:6465a3f5c58a 88 struct udp_pcb *uncon_pcb;
sunyiming 1:6465a3f5c58a 89 struct ip_hdr *iphdr;
sunyiming 1:6465a3f5c58a 90 u16_t src, dest;
sunyiming 1:6465a3f5c58a 91 u8_t local_match;
sunyiming 1:6465a3f5c58a 92 u8_t broadcast;
sunyiming 1:6465a3f5c58a 93
sunyiming 1:6465a3f5c58a 94 PERF_START;
sunyiming 1:6465a3f5c58a 95
sunyiming 1:6465a3f5c58a 96 UDP_STATS_INC(udp.recv);
sunyiming 1:6465a3f5c58a 97
sunyiming 1:6465a3f5c58a 98 iphdr = (struct ip_hdr *)p->payload;
sunyiming 1:6465a3f5c58a 99
sunyiming 1:6465a3f5c58a 100 /* Check minimum length (IP header + UDP header)
sunyiming 1:6465a3f5c58a 101 * and move payload pointer to UDP header */
sunyiming 1:6465a3f5c58a 102 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
sunyiming 1:6465a3f5c58a 103 /* drop short packets */
sunyiming 1:6465a3f5c58a 104 LWIP_DEBUGF(UDP_DEBUG,
sunyiming 1:6465a3f5c58a 105 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
sunyiming 1:6465a3f5c58a 106 UDP_STATS_INC(udp.lenerr);
sunyiming 1:6465a3f5c58a 107 UDP_STATS_INC(udp.drop);
sunyiming 1:6465a3f5c58a 108 snmp_inc_udpinerrors();
sunyiming 1:6465a3f5c58a 109 pbuf_free(p);
sunyiming 1:6465a3f5c58a 110 goto end;
sunyiming 1:6465a3f5c58a 111 }
sunyiming 1:6465a3f5c58a 112
sunyiming 1:6465a3f5c58a 113 udphdr = (struct udp_hdr *)p->payload;
sunyiming 1:6465a3f5c58a 114
sunyiming 1:6465a3f5c58a 115 /* is broadcast packet ? */
sunyiming 1:6465a3f5c58a 116 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
sunyiming 1:6465a3f5c58a 117
sunyiming 1:6465a3f5c58a 118 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
sunyiming 1:6465a3f5c58a 119
sunyiming 1:6465a3f5c58a 120 /* convert src and dest ports to host byte order */
sunyiming 1:6465a3f5c58a 121 src = ntohs(udphdr->src);
sunyiming 1:6465a3f5c58a 122 dest = ntohs(udphdr->dest);
sunyiming 1:6465a3f5c58a 123
sunyiming 1:6465a3f5c58a 124 udp_debug_print(udphdr);
sunyiming 1:6465a3f5c58a 125
sunyiming 1:6465a3f5c58a 126 /* print the UDP source and destination */
sunyiming 1:6465a3f5c58a 127 LWIP_DEBUGF(UDP_DEBUG,
sunyiming 1:6465a3f5c58a 128 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
sunyiming 1:6465a3f5c58a 129 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
sunyiming 1:6465a3f5c58a 130 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
sunyiming 1:6465a3f5c58a 131 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
sunyiming 1:6465a3f5c58a 132 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
sunyiming 1:6465a3f5c58a 133 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
sunyiming 1:6465a3f5c58a 134
sunyiming 1:6465a3f5c58a 135 #if LWIP_DHCP
sunyiming 1:6465a3f5c58a 136 pcb = NULL;
sunyiming 1:6465a3f5c58a 137 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
sunyiming 1:6465a3f5c58a 138 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
sunyiming 1:6465a3f5c58a 139 if (dest == DHCP_CLIENT_PORT) {
sunyiming 1:6465a3f5c58a 140 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
sunyiming 1:6465a3f5c58a 141 if (src == DHCP_SERVER_PORT) {
sunyiming 1:6465a3f5c58a 142 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
sunyiming 1:6465a3f5c58a 143 /* accept the packe if
sunyiming 1:6465a3f5c58a 144 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
sunyiming 1:6465a3f5c58a 145 - inp->dhcp->pcb->remote == ANY or iphdr->src */
sunyiming 1:6465a3f5c58a 146 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
sunyiming 1:6465a3f5c58a 147 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
sunyiming 1:6465a3f5c58a 148 pcb = inp->dhcp->pcb;
sunyiming 1:6465a3f5c58a 149 }
sunyiming 1:6465a3f5c58a 150 }
sunyiming 1:6465a3f5c58a 151 }
sunyiming 1:6465a3f5c58a 152 } else
sunyiming 1:6465a3f5c58a 153 #endif /* LWIP_DHCP */
sunyiming 1:6465a3f5c58a 154 {
sunyiming 1:6465a3f5c58a 155 prev = NULL;
sunyiming 1:6465a3f5c58a 156 local_match = 0;
sunyiming 1:6465a3f5c58a 157 uncon_pcb = NULL;
sunyiming 1:6465a3f5c58a 158 /* Iterate through the UDP pcb list for a matching pcb.
sunyiming 1:6465a3f5c58a 159 * 'Perfect match' pcbs (connected to the remote port & ip address) are
sunyiming 1:6465a3f5c58a 160 * preferred. If no perfect match is found, the first unconnected pcb that
sunyiming 1:6465a3f5c58a 161 * matches the local port and ip address gets the datagram. */
sunyiming 1:6465a3f5c58a 162 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
sunyiming 1:6465a3f5c58a 163 local_match = 0;
sunyiming 1:6465a3f5c58a 164 /* print the PCB local and remote address */
sunyiming 1:6465a3f5c58a 165 LWIP_DEBUGF(UDP_DEBUG,
sunyiming 1:6465a3f5c58a 166 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
sunyiming 1:6465a3f5c58a 167 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
sunyiming 1:6465a3f5c58a 168 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
sunyiming 1:6465a3f5c58a 169 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
sunyiming 1:6465a3f5c58a 170 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
sunyiming 1:6465a3f5c58a 171 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
sunyiming 1:6465a3f5c58a 172
sunyiming 1:6465a3f5c58a 173 /* compare PCB local addr+port to UDP destination addr+port */
sunyiming 1:6465a3f5c58a 174 if ((pcb->local_port == dest) &&
sunyiming 1:6465a3f5c58a 175 ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
sunyiming 1:6465a3f5c58a 176 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
sunyiming 1:6465a3f5c58a 177 #if LWIP_IGMP
sunyiming 1:6465a3f5c58a 178 ip_addr_ismulticast(&current_iphdr_dest) ||
sunyiming 1:6465a3f5c58a 179 #endif /* LWIP_IGMP */
sunyiming 1:6465a3f5c58a 180 #if IP_SOF_BROADCAST_RECV
sunyiming 1:6465a3f5c58a 181 (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
sunyiming 1:6465a3f5c58a 182 #else /* IP_SOF_BROADCAST_RECV */
sunyiming 1:6465a3f5c58a 183 (broadcast))) {
sunyiming 1:6465a3f5c58a 184 #endif /* IP_SOF_BROADCAST_RECV */
sunyiming 1:6465a3f5c58a 185 local_match = 1;
sunyiming 1:6465a3f5c58a 186 if ((uncon_pcb == NULL) &&
sunyiming 1:6465a3f5c58a 187 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
sunyiming 1:6465a3f5c58a 188 /* the first unconnected matching PCB */
sunyiming 1:6465a3f5c58a 189 uncon_pcb = pcb;
sunyiming 1:6465a3f5c58a 190 }
sunyiming 1:6465a3f5c58a 191 }
sunyiming 1:6465a3f5c58a 192 /* compare PCB remote addr+port to UDP source addr+port */
sunyiming 1:6465a3f5c58a 193 if ((local_match != 0) &&
sunyiming 1:6465a3f5c58a 194 (pcb->remote_port == src) &&
sunyiming 1:6465a3f5c58a 195 (ip_addr_isany(&pcb->remote_ip) ||
sunyiming 1:6465a3f5c58a 196 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
sunyiming 1:6465a3f5c58a 197 /* the first fully matching PCB */
sunyiming 1:6465a3f5c58a 198 if (prev != NULL) {
sunyiming 1:6465a3f5c58a 199 /* move the pcb to the front of udp_pcbs so that is
sunyiming 1:6465a3f5c58a 200 found faster next time */
sunyiming 1:6465a3f5c58a 201 prev->next = pcb->next;
sunyiming 1:6465a3f5c58a 202 pcb->next = udp_pcbs;
sunyiming 1:6465a3f5c58a 203 udp_pcbs = pcb;
sunyiming 1:6465a3f5c58a 204 } else {
sunyiming 1:6465a3f5c58a 205 UDP_STATS_INC(udp.cachehit);
sunyiming 1:6465a3f5c58a 206 }
sunyiming 1:6465a3f5c58a 207 break;
sunyiming 1:6465a3f5c58a 208 }
sunyiming 1:6465a3f5c58a 209 prev = pcb;
sunyiming 1:6465a3f5c58a 210 }
sunyiming 1:6465a3f5c58a 211 /* no fully matching pcb found? then look for an unconnected pcb */
sunyiming 1:6465a3f5c58a 212 if (pcb == NULL) {
sunyiming 1:6465a3f5c58a 213 pcb = uncon_pcb;
sunyiming 1:6465a3f5c58a 214 }
sunyiming 1:6465a3f5c58a 215 }
sunyiming 1:6465a3f5c58a 216
sunyiming 1:6465a3f5c58a 217 /* Check checksum if this is a match or if it was directed at us. */
sunyiming 1:6465a3f5c58a 218 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
sunyiming 1:6465a3f5c58a 219 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
sunyiming 1:6465a3f5c58a 220 #if LWIP_UDPLITE
sunyiming 1:6465a3f5c58a 221 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
sunyiming 1:6465a3f5c58a 222 /* Do the UDP Lite checksum */
sunyiming 1:6465a3f5c58a 223 #if CHECKSUM_CHECK_UDP
sunyiming 1:6465a3f5c58a 224 u16_t chklen = ntohs(udphdr->len);
sunyiming 1:6465a3f5c58a 225 if (chklen < sizeof(struct udp_hdr)) {
sunyiming 1:6465a3f5c58a 226 if (chklen == 0) {
sunyiming 1:6465a3f5c58a 227 /* For UDP-Lite, checksum length of 0 means checksum
sunyiming 1:6465a3f5c58a 228 over the complete packet (See RFC 3828 chap. 3.1) */
sunyiming 1:6465a3f5c58a 229 chklen = p->tot_len;
sunyiming 1:6465a3f5c58a 230 } else {
sunyiming 1:6465a3f5c58a 231 /* At least the UDP-Lite header must be covered by the
sunyiming 1:6465a3f5c58a 232 checksum! (Again, see RFC 3828 chap. 3.1) */
sunyiming 1:6465a3f5c58a 233 UDP_STATS_INC(udp.chkerr);
sunyiming 1:6465a3f5c58a 234 UDP_STATS_INC(udp.drop);
sunyiming 1:6465a3f5c58a 235 snmp_inc_udpinerrors();
sunyiming 1:6465a3f5c58a 236 pbuf_free(p);
sunyiming 1:6465a3f5c58a 237 goto end;
sunyiming 1:6465a3f5c58a 238 }
sunyiming 1:6465a3f5c58a 239 }
sunyiming 1:6465a3f5c58a 240 if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
sunyiming 1:6465a3f5c58a 241 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
sunyiming 1:6465a3f5c58a 242 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
sunyiming 1:6465a3f5c58a 243 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
sunyiming 1:6465a3f5c58a 244 UDP_STATS_INC(udp.chkerr);
sunyiming 1:6465a3f5c58a 245 UDP_STATS_INC(udp.drop);
sunyiming 1:6465a3f5c58a 246 snmp_inc_udpinerrors();
sunyiming 1:6465a3f5c58a 247 pbuf_free(p);
sunyiming 1:6465a3f5c58a 248 goto end;
sunyiming 1:6465a3f5c58a 249 }
sunyiming 1:6465a3f5c58a 250 #endif /* CHECKSUM_CHECK_UDP */
sunyiming 1:6465a3f5c58a 251 } else
sunyiming 1:6465a3f5c58a 252 #endif /* LWIP_UDPLITE */
sunyiming 1:6465a3f5c58a 253 {
sunyiming 1:6465a3f5c58a 254 #if CHECKSUM_CHECK_UDP
sunyiming 1:6465a3f5c58a 255 if (udphdr->chksum != 0) {
sunyiming 1:6465a3f5c58a 256 if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
sunyiming 1:6465a3f5c58a 257 IP_PROTO_UDP, p->tot_len) != 0) {
sunyiming 1:6465a3f5c58a 258 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
sunyiming 1:6465a3f5c58a 259 ("udp_input: UDP datagram discarded due to failing checksum\n"));
sunyiming 1:6465a3f5c58a 260 UDP_STATS_INC(udp.chkerr);
sunyiming 1:6465a3f5c58a 261 UDP_STATS_INC(udp.drop);
sunyiming 1:6465a3f5c58a 262 snmp_inc_udpinerrors();
sunyiming 1:6465a3f5c58a 263 pbuf_free(p);
sunyiming 1:6465a3f5c58a 264 goto end;
sunyiming 1:6465a3f5c58a 265 }
sunyiming 1:6465a3f5c58a 266 }
sunyiming 1:6465a3f5c58a 267 #endif /* CHECKSUM_CHECK_UDP */
sunyiming 1:6465a3f5c58a 268 }
sunyiming 1:6465a3f5c58a 269 if(pbuf_header(p, -UDP_HLEN)) {
sunyiming 1:6465a3f5c58a 270 /* Can we cope with this failing? Just assert for now */
sunyiming 1:6465a3f5c58a 271 LWIP_ASSERT("pbuf_header failed\n", 0);
sunyiming 1:6465a3f5c58a 272 UDP_STATS_INC(udp.drop);
sunyiming 1:6465a3f5c58a 273 snmp_inc_udpinerrors();
sunyiming 1:6465a3f5c58a 274 pbuf_free(p);
sunyiming 1:6465a3f5c58a 275 goto end;
sunyiming 1:6465a3f5c58a 276 }
sunyiming 1:6465a3f5c58a 277 if (pcb != NULL) {
sunyiming 1:6465a3f5c58a 278 snmp_inc_udpindatagrams();
sunyiming 1:6465a3f5c58a 279 #if SO_REUSE && SO_REUSE_RXTOALL
sunyiming 1:6465a3f5c58a 280 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
sunyiming 1:6465a3f5c58a 281 ((pcb->so_options & SOF_REUSEADDR) != 0)) {
sunyiming 1:6465a3f5c58a 282 /* pass broadcast- or multicast packets to all multicast pcbs
sunyiming 1:6465a3f5c58a 283 if SOF_REUSEADDR is set on the first match */
sunyiming 1:6465a3f5c58a 284 struct udp_pcb *mpcb;
sunyiming 1:6465a3f5c58a 285 u8_t p_header_changed = 0;
sunyiming 1:6465a3f5c58a 286 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
sunyiming 1:6465a3f5c58a 287 if (mpcb != pcb) {
sunyiming 1:6465a3f5c58a 288 /* compare PCB local addr+port to UDP destination addr+port */
sunyiming 1:6465a3f5c58a 289 if ((mpcb->local_port == dest) &&
sunyiming 1:6465a3f5c58a 290 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
sunyiming 1:6465a3f5c58a 291 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
sunyiming 1:6465a3f5c58a 292 #if LWIP_IGMP
sunyiming 1:6465a3f5c58a 293 ip_addr_ismulticast(&current_iphdr_dest) ||
sunyiming 1:6465a3f5c58a 294 #endif /* LWIP_IGMP */
sunyiming 1:6465a3f5c58a 295 #if IP_SOF_BROADCAST_RECV
sunyiming 1:6465a3f5c58a 296 (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
sunyiming 1:6465a3f5c58a 297 #else /* IP_SOF_BROADCAST_RECV */
sunyiming 1:6465a3f5c58a 298 (broadcast))) {
sunyiming 1:6465a3f5c58a 299 #endif /* IP_SOF_BROADCAST_RECV */
sunyiming 1:6465a3f5c58a 300 /* pass a copy of the packet to all local matches */
sunyiming 1:6465a3f5c58a 301 if (mpcb->recv != NULL) {
sunyiming 1:6465a3f5c58a 302 struct pbuf *q;
sunyiming 1:6465a3f5c58a 303 /* for that, move payload to IP header again */
sunyiming 1:6465a3f5c58a 304 if (p_header_changed == 0) {
sunyiming 1:6465a3f5c58a 305 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
sunyiming 1:6465a3f5c58a 306 p_header_changed = 1;
sunyiming 1:6465a3f5c58a 307 }
sunyiming 1:6465a3f5c58a 308 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
sunyiming 1:6465a3f5c58a 309 if (q != NULL) {
sunyiming 1:6465a3f5c58a 310 err_t err = pbuf_copy(q, p);
sunyiming 1:6465a3f5c58a 311 if (err == ERR_OK) {
sunyiming 1:6465a3f5c58a 312 /* move payload to UDP data */
sunyiming 1:6465a3f5c58a 313 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
sunyiming 1:6465a3f5c58a 314 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
sunyiming 1:6465a3f5c58a 315 }
sunyiming 1:6465a3f5c58a 316 }
sunyiming 1:6465a3f5c58a 317 }
sunyiming 1:6465a3f5c58a 318 }
sunyiming 1:6465a3f5c58a 319 }
sunyiming 1:6465a3f5c58a 320 }
sunyiming 1:6465a3f5c58a 321 if (p_header_changed) {
sunyiming 1:6465a3f5c58a 322 /* and move payload to UDP data again */
sunyiming 1:6465a3f5c58a 323 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
sunyiming 1:6465a3f5c58a 324 }
sunyiming 1:6465a3f5c58a 325 }
sunyiming 1:6465a3f5c58a 326 #endif /* SO_REUSE && SO_REUSE_RXTOALL */
sunyiming 1:6465a3f5c58a 327 /* callback */
sunyiming 1:6465a3f5c58a 328 if (pcb->recv != NULL) {
sunyiming 1:6465a3f5c58a 329 /* now the recv function is responsible for freeing p */
sunyiming 1:6465a3f5c58a 330 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
sunyiming 1:6465a3f5c58a 331 } else {
sunyiming 1:6465a3f5c58a 332 /* no recv function registered? then we have to free the pbuf! */
sunyiming 1:6465a3f5c58a 333 pbuf_free(p);
sunyiming 1:6465a3f5c58a 334 goto end;
sunyiming 1:6465a3f5c58a 335 }
sunyiming 1:6465a3f5c58a 336 } else {
sunyiming 1:6465a3f5c58a 337 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
sunyiming 1:6465a3f5c58a 338
sunyiming 1:6465a3f5c58a 339 #if LWIP_ICMP
sunyiming 1:6465a3f5c58a 340 /* No match was found, send ICMP destination port unreachable unless
sunyiming 1:6465a3f5c58a 341 destination address was broadcast/multicast. */
sunyiming 1:6465a3f5c58a 342 if (!broadcast &&
sunyiming 1:6465a3f5c58a 343 !ip_addr_ismulticast(&current_iphdr_dest)) {
sunyiming 1:6465a3f5c58a 344 /* move payload pointer back to ip header */
sunyiming 1:6465a3f5c58a 345 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
sunyiming 1:6465a3f5c58a 346 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
sunyiming 1:6465a3f5c58a 347 icmp_dest_unreach(p, ICMP_DUR_PORT);
sunyiming 1:6465a3f5c58a 348 }
sunyiming 1:6465a3f5c58a 349 #endif /* LWIP_ICMP */
sunyiming 1:6465a3f5c58a 350 UDP_STATS_INC(udp.proterr);
sunyiming 1:6465a3f5c58a 351 UDP_STATS_INC(udp.drop);
sunyiming 1:6465a3f5c58a 352 snmp_inc_udpnoports();
sunyiming 1:6465a3f5c58a 353 pbuf_free(p);
sunyiming 1:6465a3f5c58a 354 }
sunyiming 1:6465a3f5c58a 355 } else {
sunyiming 1:6465a3f5c58a 356 pbuf_free(p);
sunyiming 1:6465a3f5c58a 357 }
sunyiming 1:6465a3f5c58a 358 end:
sunyiming 1:6465a3f5c58a 359 PERF_STOP("udp_input");
sunyiming 1:6465a3f5c58a 360 }
sunyiming 1:6465a3f5c58a 361
sunyiming 1:6465a3f5c58a 362 /**
sunyiming 1:6465a3f5c58a 363 * Send data using UDP.
sunyiming 1:6465a3f5c58a 364 *
sunyiming 1:6465a3f5c58a 365 * @param pcb UDP PCB used to send the data.
sunyiming 1:6465a3f5c58a 366 * @param p chain of pbuf's to be sent.
sunyiming 1:6465a3f5c58a 367 *
sunyiming 1:6465a3f5c58a 368 * The datagram will be sent to the current remote_ip & remote_port
sunyiming 1:6465a3f5c58a 369 * stored in pcb. If the pcb is not bound to a port, it will
sunyiming 1:6465a3f5c58a 370 * automatically be bound to a random port.
sunyiming 1:6465a3f5c58a 371 *
sunyiming 1:6465a3f5c58a 372 * @return lwIP error code.
sunyiming 1:6465a3f5c58a 373 * - ERR_OK. Successful. No error occured.
sunyiming 1:6465a3f5c58a 374 * - ERR_MEM. Out of memory.
sunyiming 1:6465a3f5c58a 375 * - ERR_RTE. Could not find route to destination address.
sunyiming 1:6465a3f5c58a 376 * - More errors could be returned by lower protocol layers.
sunyiming 1:6465a3f5c58a 377 *
sunyiming 1:6465a3f5c58a 378 * @see udp_disconnect() udp_sendto()
sunyiming 1:6465a3f5c58a 379 */
sunyiming 1:6465a3f5c58a 380 err_t
sunyiming 1:6465a3f5c58a 381 udp_send(struct udp_pcb *pcb, struct pbuf *p)
sunyiming 1:6465a3f5c58a 382 {
sunyiming 1:6465a3f5c58a 383 /* send to the packet using remote ip and port stored in the pcb */
sunyiming 1:6465a3f5c58a 384 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
sunyiming 1:6465a3f5c58a 385 }
sunyiming 1:6465a3f5c58a 386
sunyiming 1:6465a3f5c58a 387 #if LWIP_CHECKSUM_ON_COPY
sunyiming 1:6465a3f5c58a 388 /** Same as udp_send() but with checksum
sunyiming 1:6465a3f5c58a 389 */
sunyiming 1:6465a3f5c58a 390 err_t
sunyiming 1:6465a3f5c58a 391 udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
sunyiming 1:6465a3f5c58a 392 u8_t have_chksum, u16_t chksum)
sunyiming 1:6465a3f5c58a 393 {
sunyiming 1:6465a3f5c58a 394 /* send to the packet using remote ip and port stored in the pcb */
sunyiming 1:6465a3f5c58a 395 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
sunyiming 1:6465a3f5c58a 396 have_chksum, chksum);
sunyiming 1:6465a3f5c58a 397 }
sunyiming 1:6465a3f5c58a 398 #endif /* LWIP_CHECKSUM_ON_COPY */
sunyiming 1:6465a3f5c58a 399
sunyiming 1:6465a3f5c58a 400 /**
sunyiming 1:6465a3f5c58a 401 * Send data to a specified address using UDP.
sunyiming 1:6465a3f5c58a 402 *
sunyiming 1:6465a3f5c58a 403 * @param pcb UDP PCB used to send the data.
sunyiming 1:6465a3f5c58a 404 * @param p chain of pbuf's to be sent.
sunyiming 1:6465a3f5c58a 405 * @param dst_ip Destination IP address.
sunyiming 1:6465a3f5c58a 406 * @param dst_port Destination UDP port.
sunyiming 1:6465a3f5c58a 407 *
sunyiming 1:6465a3f5c58a 408 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
sunyiming 1:6465a3f5c58a 409 *
sunyiming 1:6465a3f5c58a 410 * If the PCB already has a remote address association, it will
sunyiming 1:6465a3f5c58a 411 * be restored after the data is sent.
sunyiming 1:6465a3f5c58a 412 *
sunyiming 1:6465a3f5c58a 413 * @return lwIP error code (@see udp_send for possible error codes)
sunyiming 1:6465a3f5c58a 414 *
sunyiming 1:6465a3f5c58a 415 * @see udp_disconnect() udp_send()
sunyiming 1:6465a3f5c58a 416 */
sunyiming 1:6465a3f5c58a 417 err_t
sunyiming 1:6465a3f5c58a 418 udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
sunyiming 1:6465a3f5c58a 419 ip_addr_t *dst_ip, u16_t dst_port)
sunyiming 1:6465a3f5c58a 420 {
sunyiming 1:6465a3f5c58a 421 #if LWIP_CHECKSUM_ON_COPY
sunyiming 1:6465a3f5c58a 422 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
sunyiming 1:6465a3f5c58a 423 }
sunyiming 1:6465a3f5c58a 424
sunyiming 1:6465a3f5c58a 425 /** Same as udp_sendto(), but with checksum */
sunyiming 1:6465a3f5c58a 426 err_t
sunyiming 1:6465a3f5c58a 427 udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
sunyiming 1:6465a3f5c58a 428 u16_t dst_port, u8_t have_chksum, u16_t chksum)
sunyiming 1:6465a3f5c58a 429 {
sunyiming 1:6465a3f5c58a 430 #endif /* LWIP_CHECKSUM_ON_COPY */
sunyiming 1:6465a3f5c58a 431 struct netif *netif;
sunyiming 1:6465a3f5c58a 432
sunyiming 1:6465a3f5c58a 433 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
sunyiming 1:6465a3f5c58a 434
sunyiming 1:6465a3f5c58a 435 /* find the outgoing network interface for this packet */
sunyiming 1:6465a3f5c58a 436 #if LWIP_IGMP
sunyiming 1:6465a3f5c58a 437 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
sunyiming 1:6465a3f5c58a 438 #else
sunyiming 1:6465a3f5c58a 439 netif = ip_route(dst_ip);
sunyiming 1:6465a3f5c58a 440 #endif /* LWIP_IGMP */
sunyiming 1:6465a3f5c58a 441
sunyiming 1:6465a3f5c58a 442 /* no outgoing network interface could be found? */
sunyiming 1:6465a3f5c58a 443 if (netif == NULL) {
sunyiming 1:6465a3f5c58a 444 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
sunyiming 1:6465a3f5c58a 445 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
sunyiming 1:6465a3f5c58a 446 UDP_STATS_INC(udp.rterr);
sunyiming 1:6465a3f5c58a 447 return ERR_RTE;
sunyiming 1:6465a3f5c58a 448 }
sunyiming 1:6465a3f5c58a 449 #if LWIP_CHECKSUM_ON_COPY
sunyiming 1:6465a3f5c58a 450 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
sunyiming 1:6465a3f5c58a 451 #else /* LWIP_CHECKSUM_ON_COPY */
sunyiming 1:6465a3f5c58a 452 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
sunyiming 1:6465a3f5c58a 453 #endif /* LWIP_CHECKSUM_ON_COPY */
sunyiming 1:6465a3f5c58a 454 }
sunyiming 1:6465a3f5c58a 455
sunyiming 1:6465a3f5c58a 456 /**
sunyiming 1:6465a3f5c58a 457 * Send data to a specified address using UDP.
sunyiming 1:6465a3f5c58a 458 * The netif used for sending can be specified.
sunyiming 1:6465a3f5c58a 459 *
sunyiming 1:6465a3f5c58a 460 * This function exists mainly for DHCP, to be able to send UDP packets
sunyiming 1:6465a3f5c58a 461 * on a netif that is still down.
sunyiming 1:6465a3f5c58a 462 *
sunyiming 1:6465a3f5c58a 463 * @param pcb UDP PCB used to send the data.
sunyiming 1:6465a3f5c58a 464 * @param p chain of pbuf's to be sent.
sunyiming 1:6465a3f5c58a 465 * @param dst_ip Destination IP address.
sunyiming 1:6465a3f5c58a 466 * @param dst_port Destination UDP port.
sunyiming 1:6465a3f5c58a 467 * @param netif the netif used for sending.
sunyiming 1:6465a3f5c58a 468 *
sunyiming 1:6465a3f5c58a 469 * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
sunyiming 1:6465a3f5c58a 470 *
sunyiming 1:6465a3f5c58a 471 * @return lwIP error code (@see udp_send for possible error codes)
sunyiming 1:6465a3f5c58a 472 *
sunyiming 1:6465a3f5c58a 473 * @see udp_disconnect() udp_send()
sunyiming 1:6465a3f5c58a 474 */
sunyiming 1:6465a3f5c58a 475 err_t
sunyiming 1:6465a3f5c58a 476 udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
sunyiming 1:6465a3f5c58a 477 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
sunyiming 1:6465a3f5c58a 478 {
sunyiming 1:6465a3f5c58a 479 #if LWIP_CHECKSUM_ON_COPY
sunyiming 1:6465a3f5c58a 480 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
sunyiming 1:6465a3f5c58a 481 }
sunyiming 1:6465a3f5c58a 482
sunyiming 1:6465a3f5c58a 483 /** Same as udp_sendto_if(), but with checksum */
sunyiming 1:6465a3f5c58a 484 err_t
sunyiming 1:6465a3f5c58a 485 udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
sunyiming 1:6465a3f5c58a 486 u16_t dst_port, struct netif *netif, u8_t have_chksum,
sunyiming 1:6465a3f5c58a 487 u16_t chksum)
sunyiming 1:6465a3f5c58a 488 {
sunyiming 1:6465a3f5c58a 489 #endif /* LWIP_CHECKSUM_ON_COPY */
sunyiming 1:6465a3f5c58a 490 struct udp_hdr *udphdr;
sunyiming 1:6465a3f5c58a 491 ip_addr_t *src_ip;
sunyiming 1:6465a3f5c58a 492 err_t err;
sunyiming 1:6465a3f5c58a 493 struct pbuf *q; /* q will be sent down the stack */
sunyiming 1:6465a3f5c58a 494
sunyiming 1:6465a3f5c58a 495 #if IP_SOF_BROADCAST
sunyiming 1:6465a3f5c58a 496 /* broadcast filter? */
sunyiming 1:6465a3f5c58a 497 if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
sunyiming 1:6465a3f5c58a 498 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
sunyiming 1:6465a3f5c58a 499 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
sunyiming 1:6465a3f5c58a 500 return ERR_VAL;
sunyiming 1:6465a3f5c58a 501 }
sunyiming 1:6465a3f5c58a 502 #endif /* IP_SOF_BROADCAST */
sunyiming 1:6465a3f5c58a 503
sunyiming 1:6465a3f5c58a 504 /* if the PCB is not yet bound to a port, bind it here */
sunyiming 1:6465a3f5c58a 505 if (pcb->local_port == 0) {
sunyiming 1:6465a3f5c58a 506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
sunyiming 1:6465a3f5c58a 507 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
sunyiming 1:6465a3f5c58a 508 if (err != ERR_OK) {
sunyiming 1:6465a3f5c58a 509 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
sunyiming 1:6465a3f5c58a 510 return err;
sunyiming 1:6465a3f5c58a 511 }
sunyiming 1:6465a3f5c58a 512 }
sunyiming 1:6465a3f5c58a 513
sunyiming 1:6465a3f5c58a 514 /* not enough space to add an UDP header to first pbuf in given p chain? */
sunyiming 1:6465a3f5c58a 515 if (pbuf_header(p, UDP_HLEN)) {
sunyiming 1:6465a3f5c58a 516 /* allocate header in a separate new pbuf */
sunyiming 1:6465a3f5c58a 517 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
sunyiming 1:6465a3f5c58a 518 /* new header pbuf could not be allocated? */
sunyiming 1:6465a3f5c58a 519 if (q == NULL) {
sunyiming 1:6465a3f5c58a 520 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
sunyiming 1:6465a3f5c58a 521 return ERR_MEM;
sunyiming 1:6465a3f5c58a 522 }
sunyiming 1:6465a3f5c58a 523 if (p->tot_len != 0) {
sunyiming 1:6465a3f5c58a 524 /* chain header q in front of given pbuf p (only if p contains data) */
sunyiming 1:6465a3f5c58a 525 pbuf_chain(q, p);
sunyiming 1:6465a3f5c58a 526 }
sunyiming 1:6465a3f5c58a 527 /* first pbuf q points to header pbuf */
sunyiming 1:6465a3f5c58a 528 LWIP_DEBUGF(UDP_DEBUG,
sunyiming 1:6465a3f5c58a 529 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
sunyiming 1:6465a3f5c58a 530 } else {
sunyiming 1:6465a3f5c58a 531 /* adding space for header within p succeeded */
sunyiming 1:6465a3f5c58a 532 /* first pbuf q equals given pbuf */
sunyiming 1:6465a3f5c58a 533 q = p;
sunyiming 1:6465a3f5c58a 534 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
sunyiming 1:6465a3f5c58a 535 }
sunyiming 1:6465a3f5c58a 536 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
sunyiming 1:6465a3f5c58a 537 (q->len >= sizeof(struct udp_hdr)));
sunyiming 1:6465a3f5c58a 538 /* q now represents the packet to be sent */
sunyiming 1:6465a3f5c58a 539 udphdr = (struct udp_hdr *)q->payload;
sunyiming 1:6465a3f5c58a 540 udphdr->src = htons(pcb->local_port);
sunyiming 1:6465a3f5c58a 541 udphdr->dest = htons(dst_port);
sunyiming 1:6465a3f5c58a 542 /* in UDP, 0 checksum means 'no checksum' */
sunyiming 1:6465a3f5c58a 543 udphdr->chksum = 0x0000;
sunyiming 1:6465a3f5c58a 544
sunyiming 1:6465a3f5c58a 545 /* Multicast Loop? */
sunyiming 1:6465a3f5c58a 546 #if LWIP_IGMP
sunyiming 1:6465a3f5c58a 547 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
sunyiming 1:6465a3f5c58a 548 q->flags |= PBUF_FLAG_MCASTLOOP;
sunyiming 1:6465a3f5c58a 549 }
sunyiming 1:6465a3f5c58a 550 #endif /* LWIP_IGMP */
sunyiming 1:6465a3f5c58a 551
sunyiming 1:6465a3f5c58a 552
sunyiming 1:6465a3f5c58a 553 /* PCB local address is IP_ANY_ADDR? */
sunyiming 1:6465a3f5c58a 554 if (ip_addr_isany(&pcb->local_ip)) {
sunyiming 1:6465a3f5c58a 555 /* use outgoing network interface IP address as source address */
sunyiming 1:6465a3f5c58a 556 src_ip = &(netif->ip_addr);
sunyiming 1:6465a3f5c58a 557 } else {
sunyiming 1:6465a3f5c58a 558 /* check if UDP PCB local IP address is correct
sunyiming 1:6465a3f5c58a 559 * this could be an old address if netif->ip_addr has changed */
sunyiming 1:6465a3f5c58a 560 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
sunyiming 1:6465a3f5c58a 561 /* local_ip doesn't match, drop the packet */
sunyiming 1:6465a3f5c58a 562 if (q != p) {
sunyiming 1:6465a3f5c58a 563 /* free the header pbuf */
sunyiming 1:6465a3f5c58a 564 pbuf_free(q);
sunyiming 1:6465a3f5c58a 565 q = NULL;
sunyiming 1:6465a3f5c58a 566 /* p is still referenced by the caller, and will live on */
sunyiming 1:6465a3f5c58a 567 }
sunyiming 1:6465a3f5c58a 568 return ERR_VAL;
sunyiming 1:6465a3f5c58a 569 }
sunyiming 1:6465a3f5c58a 570 /* use UDP PCB local IP address as source address */
sunyiming 1:6465a3f5c58a 571 src_ip = &(pcb->local_ip);
sunyiming 1:6465a3f5c58a 572 }
sunyiming 1:6465a3f5c58a 573
sunyiming 1:6465a3f5c58a 574 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
sunyiming 1:6465a3f5c58a 575
sunyiming 1:6465a3f5c58a 576 #if LWIP_UDPLITE
sunyiming 1:6465a3f5c58a 577 /* UDP Lite protocol? */
sunyiming 1:6465a3f5c58a 578 if (pcb->flags & UDP_FLAGS_UDPLITE) {
sunyiming 1:6465a3f5c58a 579 u16_t chklen, chklen_hdr;
sunyiming 1:6465a3f5c58a 580 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
sunyiming 1:6465a3f5c58a 581 /* set UDP message length in UDP header */
sunyiming 1:6465a3f5c58a 582 chklen_hdr = chklen = pcb->chksum_len_tx;
sunyiming 1:6465a3f5c58a 583 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
sunyiming 1:6465a3f5c58a 584 if (chklen != 0) {
sunyiming 1:6465a3f5c58a 585 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
sunyiming 1:6465a3f5c58a 586 }
sunyiming 1:6465a3f5c58a 587 /* For UDP-Lite, checksum length of 0 means checksum
sunyiming 1:6465a3f5c58a 588 over the complete packet. (See RFC 3828 chap. 3.1)
sunyiming 1:6465a3f5c58a 589 At least the UDP-Lite header must be covered by the
sunyiming 1:6465a3f5c58a 590 checksum, therefore, if chksum_len has an illegal
sunyiming 1:6465a3f5c58a 591 value, we generate the checksum over the complete
sunyiming 1:6465a3f5c58a 592 packet to be safe. */
sunyiming 1:6465a3f5c58a 593 chklen_hdr = 0;
sunyiming 1:6465a3f5c58a 594 chklen = q->tot_len;
sunyiming 1:6465a3f5c58a 595 }
sunyiming 1:6465a3f5c58a 596 udphdr->len = htons(chklen_hdr);
sunyiming 1:6465a3f5c58a 597 /* calculate checksum */
sunyiming 1:6465a3f5c58a 598 #if CHECKSUM_GEN_UDP
sunyiming 1:6465a3f5c58a 599 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
sunyiming 1:6465a3f5c58a 600 IP_PROTO_UDPLITE, q->tot_len,
sunyiming 1:6465a3f5c58a 601 #if !LWIP_CHECKSUM_ON_COPY
sunyiming 1:6465a3f5c58a 602 chklen);
sunyiming 1:6465a3f5c58a 603 #else /* !LWIP_CHECKSUM_ON_COPY */
sunyiming 1:6465a3f5c58a 604 (have_chksum ? UDP_HLEN : chklen));
sunyiming 1:6465a3f5c58a 605 if (have_chksum) {
sunyiming 1:6465a3f5c58a 606 u32_t acc;
sunyiming 1:6465a3f5c58a 607 acc = udphdr->chksum + (u16_t)~(chksum);
sunyiming 1:6465a3f5c58a 608 udphdr->chksum = FOLD_U32T(acc);
sunyiming 1:6465a3f5c58a 609 }
sunyiming 1:6465a3f5c58a 610 #endif /* !LWIP_CHECKSUM_ON_COPY */
sunyiming 1:6465a3f5c58a 611
sunyiming 1:6465a3f5c58a 612 /* chksum zero must become 0xffff, as zero means 'no checksum' */
sunyiming 1:6465a3f5c58a 613 if (udphdr->chksum == 0x0000) {
sunyiming 1:6465a3f5c58a 614 udphdr->chksum = 0xffff;
sunyiming 1:6465a3f5c58a 615 }
sunyiming 1:6465a3f5c58a 616 #endif /* CHECKSUM_GEN_UDP */
sunyiming 1:6465a3f5c58a 617 /* output to IP */
sunyiming 1:6465a3f5c58a 618 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
sunyiming 1:6465a3f5c58a 619 #if LWIP_NETIF_HWADDRHINT
sunyiming 1:6465a3f5c58a 620 netif->addr_hint = &(pcb->addr_hint);
sunyiming 1:6465a3f5c58a 621 #endif /* LWIP_NETIF_HWADDRHINT*/
sunyiming 1:6465a3f5c58a 622 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
sunyiming 1:6465a3f5c58a 623 #if LWIP_NETIF_HWADDRHINT
sunyiming 1:6465a3f5c58a 624 netif->addr_hint = NULL;
sunyiming 1:6465a3f5c58a 625 #endif /* LWIP_NETIF_HWADDRHINT*/
sunyiming 1:6465a3f5c58a 626 } else
sunyiming 1:6465a3f5c58a 627 #endif /* LWIP_UDPLITE */
sunyiming 1:6465a3f5c58a 628 { /* UDP */
sunyiming 1:6465a3f5c58a 629 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
sunyiming 1:6465a3f5c58a 630 udphdr->len = htons(q->tot_len);
sunyiming 1:6465a3f5c58a 631 /* calculate checksum */
sunyiming 1:6465a3f5c58a 632 #if CHECKSUM_GEN_UDP
sunyiming 1:6465a3f5c58a 633 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
sunyiming 1:6465a3f5c58a 634 u16_t udpchksum;
sunyiming 1:6465a3f5c58a 635 #if LWIP_CHECKSUM_ON_COPY
sunyiming 1:6465a3f5c58a 636 if (have_chksum) {
sunyiming 1:6465a3f5c58a 637 u32_t acc;
sunyiming 1:6465a3f5c58a 638 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
sunyiming 1:6465a3f5c58a 639 q->tot_len, UDP_HLEN);
sunyiming 1:6465a3f5c58a 640 acc = udpchksum + (u16_t)~(chksum);
sunyiming 1:6465a3f5c58a 641 udpchksum = FOLD_U32T(acc);
sunyiming 1:6465a3f5c58a 642 } else
sunyiming 1:6465a3f5c58a 643 #endif /* LWIP_CHECKSUM_ON_COPY */
sunyiming 1:6465a3f5c58a 644 {
sunyiming 1:6465a3f5c58a 645 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
sunyiming 1:6465a3f5c58a 646 }
sunyiming 1:6465a3f5c58a 647
sunyiming 1:6465a3f5c58a 648 /* chksum zero must become 0xffff, as zero means 'no checksum' */
sunyiming 1:6465a3f5c58a 649 if (udpchksum == 0x0000) {
sunyiming 1:6465a3f5c58a 650 udpchksum = 0xffff;
sunyiming 1:6465a3f5c58a 651 }
sunyiming 1:6465a3f5c58a 652 udphdr->chksum = udpchksum;
sunyiming 1:6465a3f5c58a 653 }
sunyiming 1:6465a3f5c58a 654 #endif /* CHECKSUM_GEN_UDP */
sunyiming 1:6465a3f5c58a 655 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
sunyiming 1:6465a3f5c58a 656 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
sunyiming 1:6465a3f5c58a 657 /* output to IP */
sunyiming 1:6465a3f5c58a 658 #if LWIP_NETIF_HWADDRHINT
sunyiming 1:6465a3f5c58a 659 netif->addr_hint = &(pcb->addr_hint);
sunyiming 1:6465a3f5c58a 660 #endif /* LWIP_NETIF_HWADDRHINT*/
sunyiming 1:6465a3f5c58a 661 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
sunyiming 1:6465a3f5c58a 662 #if LWIP_NETIF_HWADDRHINT
sunyiming 1:6465a3f5c58a 663 netif->addr_hint = NULL;
sunyiming 1:6465a3f5c58a 664 #endif /* LWIP_NETIF_HWADDRHINT*/
sunyiming 1:6465a3f5c58a 665 }
sunyiming 1:6465a3f5c58a 666 /* TODO: must this be increased even if error occured? */
sunyiming 1:6465a3f5c58a 667 snmp_inc_udpoutdatagrams();
sunyiming 1:6465a3f5c58a 668
sunyiming 1:6465a3f5c58a 669 /* did we chain a separate header pbuf earlier? */
sunyiming 1:6465a3f5c58a 670 if (q != p) {
sunyiming 1:6465a3f5c58a 671 /* free the header pbuf */
sunyiming 1:6465a3f5c58a 672 pbuf_free(q);
sunyiming 1:6465a3f5c58a 673 q = NULL;
sunyiming 1:6465a3f5c58a 674 /* p is still referenced by the caller, and will live on */
sunyiming 1:6465a3f5c58a 675 }
sunyiming 1:6465a3f5c58a 676
sunyiming 1:6465a3f5c58a 677 UDP_STATS_INC(udp.xmit);
sunyiming 1:6465a3f5c58a 678 return err;
sunyiming 1:6465a3f5c58a 679 }
sunyiming 1:6465a3f5c58a 680
sunyiming 1:6465a3f5c58a 681 /**
sunyiming 1:6465a3f5c58a 682 * Bind an UDP PCB.
sunyiming 1:6465a3f5c58a 683 *
sunyiming 1:6465a3f5c58a 684 * @param pcb UDP PCB to be bound with a local address ipaddr and port.
sunyiming 1:6465a3f5c58a 685 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
sunyiming 1:6465a3f5c58a 686 * bind to all local interfaces.
sunyiming 1:6465a3f5c58a 687 * @param port local UDP port to bind with. Use 0 to automatically bind
sunyiming 1:6465a3f5c58a 688 * to a random port between UDP_LOCAL_PORT_RANGE_START and
sunyiming 1:6465a3f5c58a 689 * UDP_LOCAL_PORT_RANGE_END.
sunyiming 1:6465a3f5c58a 690 *
sunyiming 1:6465a3f5c58a 691 * ipaddr & port are expected to be in the same byte order as in the pcb.
sunyiming 1:6465a3f5c58a 692 *
sunyiming 1:6465a3f5c58a 693 * @return lwIP error code.
sunyiming 1:6465a3f5c58a 694 * - ERR_OK. Successful. No error occured.
sunyiming 1:6465a3f5c58a 695 * - ERR_USE. The specified ipaddr and port are already bound to by
sunyiming 1:6465a3f5c58a 696 * another UDP PCB.
sunyiming 1:6465a3f5c58a 697 *
sunyiming 1:6465a3f5c58a 698 * @see udp_disconnect()
sunyiming 1:6465a3f5c58a 699 */
sunyiming 1:6465a3f5c58a 700 err_t
sunyiming 1:6465a3f5c58a 701 udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
sunyiming 1:6465a3f5c58a 702 {
sunyiming 1:6465a3f5c58a 703 struct udp_pcb *ipcb;
sunyiming 1:6465a3f5c58a 704 u8_t rebind;
sunyiming 1:6465a3f5c58a 705
sunyiming 1:6465a3f5c58a 706 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
sunyiming 1:6465a3f5c58a 707 ip_addr_debug_print(UDP_DEBUG, ipaddr);
sunyiming 1:6465a3f5c58a 708 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
sunyiming 1:6465a3f5c58a 709
sunyiming 1:6465a3f5c58a 710 rebind = 0;
sunyiming 1:6465a3f5c58a 711 /* Check for double bind and rebind of the same pcb */
sunyiming 1:6465a3f5c58a 712 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
sunyiming 1:6465a3f5c58a 713 /* is this UDP PCB already on active list? */
sunyiming 1:6465a3f5c58a 714 if (pcb == ipcb) {
sunyiming 1:6465a3f5c58a 715 /* pcb may occur at most once in active list */
sunyiming 1:6465a3f5c58a 716 LWIP_ASSERT("rebind == 0", rebind == 0);
sunyiming 1:6465a3f5c58a 717 /* pcb already in list, just rebind */
sunyiming 1:6465a3f5c58a 718 rebind = 1;
sunyiming 1:6465a3f5c58a 719 }
sunyiming 1:6465a3f5c58a 720
sunyiming 1:6465a3f5c58a 721 /* By default, we don't allow to bind to a port that any other udp
sunyiming 1:6465a3f5c58a 722 PCB is alread bound to, unless *all* PCBs with that port have tha
sunyiming 1:6465a3f5c58a 723 REUSEADDR flag set. */
sunyiming 1:6465a3f5c58a 724 #if SO_REUSE
sunyiming 1:6465a3f5c58a 725 else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
sunyiming 1:6465a3f5c58a 726 ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
sunyiming 1:6465a3f5c58a 727 #else /* SO_REUSE */
sunyiming 1:6465a3f5c58a 728 /* port matches that of PCB in list and REUSEADDR not set -> reject */
sunyiming 1:6465a3f5c58a 729 else {
sunyiming 1:6465a3f5c58a 730 #endif /* SO_REUSE */
sunyiming 1:6465a3f5c58a 731 if ((ipcb->local_port == port) &&
sunyiming 1:6465a3f5c58a 732 /* IP address matches, or one is IP_ADDR_ANY? */
sunyiming 1:6465a3f5c58a 733 (ip_addr_isany(&(ipcb->local_ip)) ||
sunyiming 1:6465a3f5c58a 734 ip_addr_isany(ipaddr) ||
sunyiming 1:6465a3f5c58a 735 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
sunyiming 1:6465a3f5c58a 736 /* other PCB already binds to this local IP and port */
sunyiming 1:6465a3f5c58a 737 LWIP_DEBUGF(UDP_DEBUG,
sunyiming 1:6465a3f5c58a 738 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
sunyiming 1:6465a3f5c58a 739 return ERR_USE;
sunyiming 1:6465a3f5c58a 740 }
sunyiming 1:6465a3f5c58a 741 }
sunyiming 1:6465a3f5c58a 742 }
sunyiming 1:6465a3f5c58a 743
sunyiming 1:6465a3f5c58a 744 ip_addr_set(&pcb->local_ip, ipaddr);
sunyiming 1:6465a3f5c58a 745
sunyiming 1:6465a3f5c58a 746 /* no port specified? */
sunyiming 1:6465a3f5c58a 747 if (port == 0) {
sunyiming 1:6465a3f5c58a 748 #ifndef UDP_LOCAL_PORT_RANGE_START
sunyiming 1:6465a3f5c58a 749 /* From http://www.iana.org/assignments/port-numbers:
sunyiming 1:6465a3f5c58a 750 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
sunyiming 1:6465a3f5c58a 751 #define UDP_LOCAL_PORT_RANGE_START 0xc000
sunyiming 1:6465a3f5c58a 752 #define UDP_LOCAL_PORT_RANGE_END 0xffff
sunyiming 1:6465a3f5c58a 753 #endif
sunyiming 1:6465a3f5c58a 754 port = UDP_LOCAL_PORT_RANGE_START;
sunyiming 1:6465a3f5c58a 755 ipcb = udp_pcbs;
sunyiming 1:6465a3f5c58a 756 while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
sunyiming 1:6465a3f5c58a 757 if (ipcb->local_port == port) {
sunyiming 1:6465a3f5c58a 758 /* port is already used by another udp_pcb */
sunyiming 1:6465a3f5c58a 759 port++;
sunyiming 1:6465a3f5c58a 760 /* restart scanning all udp pcbs */
sunyiming 1:6465a3f5c58a 761 ipcb = udp_pcbs;
sunyiming 1:6465a3f5c58a 762 } else {
sunyiming 1:6465a3f5c58a 763 /* go on with next udp pcb */
sunyiming 1:6465a3f5c58a 764 ipcb = ipcb->next;
sunyiming 1:6465a3f5c58a 765 }
sunyiming 1:6465a3f5c58a 766 }
sunyiming 1:6465a3f5c58a 767 if (ipcb != NULL) {
sunyiming 1:6465a3f5c58a 768 /* no more ports available in local range */
sunyiming 1:6465a3f5c58a 769 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
sunyiming 1:6465a3f5c58a 770 return ERR_USE;
sunyiming 1:6465a3f5c58a 771 }
sunyiming 1:6465a3f5c58a 772 }
sunyiming 1:6465a3f5c58a 773 pcb->local_port = port;
sunyiming 1:6465a3f5c58a 774 snmp_insert_udpidx_tree(pcb);
sunyiming 1:6465a3f5c58a 775 /* pcb not active yet? */
sunyiming 1:6465a3f5c58a 776 if (rebind == 0) {
sunyiming 1:6465a3f5c58a 777 /* place the PCB on the active list if not already there */
sunyiming 1:6465a3f5c58a 778 pcb->next = udp_pcbs;
sunyiming 1:6465a3f5c58a 779 udp_pcbs = pcb;
sunyiming 1:6465a3f5c58a 780 }
sunyiming 1:6465a3f5c58a 781 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
sunyiming 1:6465a3f5c58a 782 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
sunyiming 1:6465a3f5c58a 783 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
sunyiming 1:6465a3f5c58a 784 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
sunyiming 1:6465a3f5c58a 785 pcb->local_port));
sunyiming 1:6465a3f5c58a 786 return ERR_OK;
sunyiming 1:6465a3f5c58a 787 }
sunyiming 1:6465a3f5c58a 788 /**
sunyiming 1:6465a3f5c58a 789 * Connect an UDP PCB.
sunyiming 1:6465a3f5c58a 790 *
sunyiming 1:6465a3f5c58a 791 * This will associate the UDP PCB with the remote address.
sunyiming 1:6465a3f5c58a 792 *
sunyiming 1:6465a3f5c58a 793 * @param pcb UDP PCB to be connected with remote address ipaddr and port.
sunyiming 1:6465a3f5c58a 794 * @param ipaddr remote IP address to connect with.
sunyiming 1:6465a3f5c58a 795 * @param port remote UDP port to connect with.
sunyiming 1:6465a3f5c58a 796 *
sunyiming 1:6465a3f5c58a 797 * @return lwIP error code
sunyiming 1:6465a3f5c58a 798 *
sunyiming 1:6465a3f5c58a 799 * ipaddr & port are expected to be in the same byte order as in the pcb.
sunyiming 1:6465a3f5c58a 800 *
sunyiming 1:6465a3f5c58a 801 * The udp pcb is bound to a random local port if not already bound.
sunyiming 1:6465a3f5c58a 802 *
sunyiming 1:6465a3f5c58a 803 * @see udp_disconnect()
sunyiming 1:6465a3f5c58a 804 */
sunyiming 1:6465a3f5c58a 805 err_t
sunyiming 1:6465a3f5c58a 806 udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
sunyiming 1:6465a3f5c58a 807 {
sunyiming 1:6465a3f5c58a 808 struct udp_pcb *ipcb;
sunyiming 1:6465a3f5c58a 809
sunyiming 1:6465a3f5c58a 810 if (pcb->local_port == 0) {
sunyiming 1:6465a3f5c58a 811 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
sunyiming 1:6465a3f5c58a 812 if (err != ERR_OK) {
sunyiming 1:6465a3f5c58a 813 return err;
sunyiming 1:6465a3f5c58a 814 }
sunyiming 1:6465a3f5c58a 815 }
sunyiming 1:6465a3f5c58a 816
sunyiming 1:6465a3f5c58a 817 ip_addr_set(&pcb->remote_ip, ipaddr);
sunyiming 1:6465a3f5c58a 818 pcb->remote_port = port;
sunyiming 1:6465a3f5c58a 819 pcb->flags |= UDP_FLAGS_CONNECTED;
sunyiming 1:6465a3f5c58a 820 /** TODO: this functionality belongs in upper layers */
sunyiming 1:6465a3f5c58a 821 #ifdef LWIP_UDP_TODO
sunyiming 1:6465a3f5c58a 822 /* Nail down local IP for netconn_addr()/getsockname() */
sunyiming 1:6465a3f5c58a 823 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
sunyiming 1:6465a3f5c58a 824 struct netif *netif;
sunyiming 1:6465a3f5c58a 825
sunyiming 1:6465a3f5c58a 826 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
sunyiming 1:6465a3f5c58a 827 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
sunyiming 1:6465a3f5c58a 828 UDP_STATS_INC(udp.rterr);
sunyiming 1:6465a3f5c58a 829 return ERR_RTE;
sunyiming 1:6465a3f5c58a 830 }
sunyiming 1:6465a3f5c58a 831 /** TODO: this will bind the udp pcb locally, to the interface which
sunyiming 1:6465a3f5c58a 832 is used to route output packets to the remote address. However, we
sunyiming 1:6465a3f5c58a 833 might want to accept incoming packets on any interface! */
sunyiming 1:6465a3f5c58a 834 pcb->local_ip = netif->ip_addr;
sunyiming 1:6465a3f5c58a 835 } else if (ip_addr_isany(&pcb->remote_ip)) {
sunyiming 1:6465a3f5c58a 836 pcb->local_ip.addr = 0;
sunyiming 1:6465a3f5c58a 837 }
sunyiming 1:6465a3f5c58a 838 #endif
sunyiming 1:6465a3f5c58a 839 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
sunyiming 1:6465a3f5c58a 840 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
sunyiming 1:6465a3f5c58a 841 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
sunyiming 1:6465a3f5c58a 842 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
sunyiming 1:6465a3f5c58a 843 pcb->local_port));
sunyiming 1:6465a3f5c58a 844
sunyiming 1:6465a3f5c58a 845 /* Insert UDP PCB into the list of active UDP PCBs. */
sunyiming 1:6465a3f5c58a 846 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
sunyiming 1:6465a3f5c58a 847 if (pcb == ipcb) {
sunyiming 1:6465a3f5c58a 848 /* already on the list, just return */
sunyiming 1:6465a3f5c58a 849 return ERR_OK;
sunyiming 1:6465a3f5c58a 850 }
sunyiming 1:6465a3f5c58a 851 }
sunyiming 1:6465a3f5c58a 852 /* PCB not yet on the list, add PCB now */
sunyiming 1:6465a3f5c58a 853 pcb->next = udp_pcbs;
sunyiming 1:6465a3f5c58a 854 udp_pcbs = pcb;
sunyiming 1:6465a3f5c58a 855 return ERR_OK;
sunyiming 1:6465a3f5c58a 856 }
sunyiming 1:6465a3f5c58a 857
sunyiming 1:6465a3f5c58a 858 /**
sunyiming 1:6465a3f5c58a 859 * Disconnect a UDP PCB
sunyiming 1:6465a3f5c58a 860 *
sunyiming 1:6465a3f5c58a 861 * @param pcb the udp pcb to disconnect.
sunyiming 1:6465a3f5c58a 862 */
sunyiming 1:6465a3f5c58a 863 void
sunyiming 1:6465a3f5c58a 864 udp_disconnect(struct udp_pcb *pcb)
sunyiming 1:6465a3f5c58a 865 {
sunyiming 1:6465a3f5c58a 866 /* reset remote address association */
sunyiming 1:6465a3f5c58a 867 ip_addr_set_any(&pcb->remote_ip);
sunyiming 1:6465a3f5c58a 868 pcb->remote_port = 0;
sunyiming 1:6465a3f5c58a 869 /* mark PCB as unconnected */
sunyiming 1:6465a3f5c58a 870 pcb->flags &= ~UDP_FLAGS_CONNECTED;
sunyiming 1:6465a3f5c58a 871 }
sunyiming 1:6465a3f5c58a 872
sunyiming 1:6465a3f5c58a 873 /**
sunyiming 1:6465a3f5c58a 874 * Set a receive callback for a UDP PCB
sunyiming 1:6465a3f5c58a 875 *
sunyiming 1:6465a3f5c58a 876 * This callback will be called when receiving a datagram for the pcb.
sunyiming 1:6465a3f5c58a 877 *
sunyiming 1:6465a3f5c58a 878 * @param pcb the pcb for wich to set the recv callback
sunyiming 1:6465a3f5c58a 879 * @param recv function pointer of the callback function
sunyiming 1:6465a3f5c58a 880 * @param recv_arg additional argument to pass to the callback function
sunyiming 1:6465a3f5c58a 881 */
sunyiming 1:6465a3f5c58a 882 void
sunyiming 1:6465a3f5c58a 883 udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
sunyiming 1:6465a3f5c58a 884 {
sunyiming 1:6465a3f5c58a 885 /* remember recv() callback and user data */
sunyiming 1:6465a3f5c58a 886 pcb->recv = recv;
sunyiming 1:6465a3f5c58a 887 pcb->recv_arg = recv_arg;
sunyiming 1:6465a3f5c58a 888 }
sunyiming 1:6465a3f5c58a 889
sunyiming 1:6465a3f5c58a 890 /**
sunyiming 1:6465a3f5c58a 891 * Remove an UDP PCB.
sunyiming 1:6465a3f5c58a 892 *
sunyiming 1:6465a3f5c58a 893 * @param pcb UDP PCB to be removed. The PCB is removed from the list of
sunyiming 1:6465a3f5c58a 894 * UDP PCB's and the data structure is freed from memory.
sunyiming 1:6465a3f5c58a 895 *
sunyiming 1:6465a3f5c58a 896 * @see udp_new()
sunyiming 1:6465a3f5c58a 897 */
sunyiming 1:6465a3f5c58a 898 void
sunyiming 1:6465a3f5c58a 899 udp_remove(struct udp_pcb *pcb)
sunyiming 1:6465a3f5c58a 900 {
sunyiming 1:6465a3f5c58a 901 struct udp_pcb *pcb2;
sunyiming 1:6465a3f5c58a 902
sunyiming 1:6465a3f5c58a 903 snmp_delete_udpidx_tree(pcb);
sunyiming 1:6465a3f5c58a 904 /* pcb to be removed is first in list? */
sunyiming 1:6465a3f5c58a 905 if (udp_pcbs == pcb) {
sunyiming 1:6465a3f5c58a 906 /* make list start at 2nd pcb */
sunyiming 1:6465a3f5c58a 907 udp_pcbs = udp_pcbs->next;
sunyiming 1:6465a3f5c58a 908 /* pcb not 1st in list */
sunyiming 1:6465a3f5c58a 909 } else {
sunyiming 1:6465a3f5c58a 910 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
sunyiming 1:6465a3f5c58a 911 /* find pcb in udp_pcbs list */
sunyiming 1:6465a3f5c58a 912 if (pcb2->next != NULL && pcb2->next == pcb) {
sunyiming 1:6465a3f5c58a 913 /* remove pcb from list */
sunyiming 1:6465a3f5c58a 914 pcb2->next = pcb->next;
sunyiming 1:6465a3f5c58a 915 }
sunyiming 1:6465a3f5c58a 916 }
sunyiming 1:6465a3f5c58a 917 }
sunyiming 1:6465a3f5c58a 918 memp_free(MEMP_UDP_PCB, pcb);
sunyiming 1:6465a3f5c58a 919 }
sunyiming 1:6465a3f5c58a 920
sunyiming 1:6465a3f5c58a 921 /**
sunyiming 1:6465a3f5c58a 922 * Create a UDP PCB.
sunyiming 1:6465a3f5c58a 923 *
sunyiming 1:6465a3f5c58a 924 * @return The UDP PCB which was created. NULL if the PCB data structure
sunyiming 1:6465a3f5c58a 925 * could not be allocated.
sunyiming 1:6465a3f5c58a 926 *
sunyiming 1:6465a3f5c58a 927 * @see udp_remove()
sunyiming 1:6465a3f5c58a 928 */
sunyiming 1:6465a3f5c58a 929 struct udp_pcb *
sunyiming 1:6465a3f5c58a 930 udp_new(void)
sunyiming 1:6465a3f5c58a 931 {
sunyiming 1:6465a3f5c58a 932 struct udp_pcb *pcb;
sunyiming 1:6465a3f5c58a 933 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
sunyiming 1:6465a3f5c58a 934 /* could allocate UDP PCB? */
sunyiming 1:6465a3f5c58a 935 if (pcb != NULL) {
sunyiming 1:6465a3f5c58a 936 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
sunyiming 1:6465a3f5c58a 937 * which means checksum is generated over the whole datagram per default
sunyiming 1:6465a3f5c58a 938 * (recommended as default by RFC 3828). */
sunyiming 1:6465a3f5c58a 939 /* initialize PCB to all zeroes */
sunyiming 1:6465a3f5c58a 940 memset(pcb, 0, sizeof(struct udp_pcb));
sunyiming 1:6465a3f5c58a 941 pcb->ttl = UDP_TTL;
sunyiming 1:6465a3f5c58a 942 }
sunyiming 1:6465a3f5c58a 943 return pcb;
sunyiming 1:6465a3f5c58a 944 }
sunyiming 1:6465a3f5c58a 945
sunyiming 1:6465a3f5c58a 946 #if UDP_DEBUG
sunyiming 1:6465a3f5c58a 947 /**
sunyiming 1:6465a3f5c58a 948 * Print UDP header information for debug purposes.
sunyiming 1:6465a3f5c58a 949 *
sunyiming 1:6465a3f5c58a 950 * @param udphdr pointer to the udp header in memory.
sunyiming 1:6465a3f5c58a 951 */
sunyiming 1:6465a3f5c58a 952 void
sunyiming 1:6465a3f5c58a 953 udp_debug_print(struct udp_hdr *udphdr)
sunyiming 1:6465a3f5c58a 954 {
sunyiming 1:6465a3f5c58a 955 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
sunyiming 1:6465a3f5c58a 956 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
sunyiming 1:6465a3f5c58a 957 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
sunyiming 1:6465a3f5c58a 958 ntohs(udphdr->src), ntohs(udphdr->dest)));
sunyiming 1:6465a3f5c58a 959 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
sunyiming 1:6465a3f5c58a 960 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
sunyiming 1:6465a3f5c58a 961 ntohs(udphdr->len), ntohs(udphdr->chksum)));
sunyiming 1:6465a3f5c58a 962 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
sunyiming 1:6465a3f5c58a 963 }
sunyiming 1:6465a3f5c58a 964 #endif /* UDP_DEBUG */
sunyiming 1:6465a3f5c58a 965
sunyiming 1:6465a3f5c58a 966 #endif /* LWIP_UDP */