Donatien Garnier
NetServices Stack source
Dependents: HelloWorld ServoInterfaceBoardExample1 4180_Lab4
lwip/core/udp.c@0:632c9925f013, 2010-06-11 (annotated)
- Committer:
- donatien
- Date:
- Fri Jun 11 16:05:15 2010 +0000
- Revision:
- 0:632c9925f013
- Child:
- 5:dd63a1e02b1b
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| donatien | 0:632c9925f013 | 1 | /** |
| donatien | 0:632c9925f013 | 2 | * @file |
| donatien | 0:632c9925f013 | 3 | * User Datagram Protocol module |
| donatien | 0:632c9925f013 | 4 | * |
| donatien | 0:632c9925f013 | 5 | */ |
| donatien | 0:632c9925f013 | 6 | |
| donatien | 0:632c9925f013 | 7 | /* |
| donatien | 0:632c9925f013 | 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| donatien | 0:632c9925f013 | 9 | * All rights reserved. |
| donatien | 0:632c9925f013 | 10 | * |
| donatien | 0:632c9925f013 | 11 | * Redistribution and use in source and binary forms, with or without modification, |
| donatien | 0:632c9925f013 | 12 | * are permitted provided that the following conditions are met: |
| donatien | 0:632c9925f013 | 13 | * |
| donatien | 0:632c9925f013 | 14 | * 1. Redistributions of source code must retain the above copyright notice, |
| donatien | 0:632c9925f013 | 15 | * this list of conditions and the following disclaimer. |
| donatien | 0:632c9925f013 | 16 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| donatien | 0:632c9925f013 | 17 | * this list of conditions and the following disclaimer in the documentation |
| donatien | 0:632c9925f013 | 18 | * and/or other materials provided with the distribution. |
| donatien | 0:632c9925f013 | 19 | * 3. The name of the author may not be used to endorse or promote products |
| donatien | 0:632c9925f013 | 20 | * derived from this software without specific prior written permission. |
| donatien | 0:632c9925f013 | 21 | * |
| donatien | 0:632c9925f013 | 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| donatien | 0:632c9925f013 | 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| donatien | 0:632c9925f013 | 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| donatien | 0:632c9925f013 | 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| donatien | 0:632c9925f013 | 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| donatien | 0:632c9925f013 | 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| donatien | 0:632c9925f013 | 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| donatien | 0:632c9925f013 | 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| donatien | 0:632c9925f013 | 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| donatien | 0:632c9925f013 | 31 | * OF SUCH DAMAGE. |
| donatien | 0:632c9925f013 | 32 | * |
| donatien | 0:632c9925f013 | 33 | * This file is part of the lwIP TCP/IP stack. |
| donatien | 0:632c9925f013 | 34 | * |
| donatien | 0:632c9925f013 | 35 | * Author: Adam Dunkels <adam@sics.se> |
| donatien | 0:632c9925f013 | 36 | * |
| donatien | 0:632c9925f013 | 37 | */ |
| donatien | 0:632c9925f013 | 38 | |
| donatien | 0:632c9925f013 | 39 | |
| donatien | 0:632c9925f013 | 40 | /* udp.c |
| donatien | 0:632c9925f013 | 41 | * |
| donatien | 0:632c9925f013 | 42 | * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828). |
| donatien | 0:632c9925f013 | 43 | * |
| donatien | 0:632c9925f013 | 44 | */ |
| donatien | 0:632c9925f013 | 45 | |
| donatien | 0:632c9925f013 | 46 | /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'! |
| donatien | 0:632c9925f013 | 47 | */ |
| donatien | 0:632c9925f013 | 48 | |
| donatien | 0:632c9925f013 | 49 | #include "lwip/opt.h" |
| donatien | 0:632c9925f013 | 50 | |
| donatien | 0:632c9925f013 | 51 | #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */ |
| donatien | 0:632c9925f013 | 52 | |
| donatien | 0:632c9925f013 | 53 | #include "lwip/udp.h" |
| donatien | 0:632c9925f013 | 54 | #include "lwip/def.h" |
| donatien | 0:632c9925f013 | 55 | #include "lwip/memp.h" |
| donatien | 0:632c9925f013 | 56 | #include "lwip/inet_chksum.h" |
| donatien | 0:632c9925f013 | 57 | #include "lwip/ip_addr.h" |
| donatien | 0:632c9925f013 | 58 | #include "lwip/netif.h" |
| donatien | 0:632c9925f013 | 59 | #include "lwip/icmp.h" |
| donatien | 0:632c9925f013 | 60 | #include "lwip/stats.h" |
| donatien | 0:632c9925f013 | 61 | #include "lwip/snmp.h" |
| donatien | 0:632c9925f013 | 62 | #include "arch/perf.h" |
| donatien | 0:632c9925f013 | 63 | #include "lwip/dhcp.h" |
| donatien | 0:632c9925f013 | 64 | |
| donatien | 0:632c9925f013 | 65 | #include <string.h> |
| donatien | 0:632c9925f013 | 66 | |
| donatien | 0:632c9925f013 | 67 | /* The list of UDP PCBs */ |
| donatien | 0:632c9925f013 | 68 | /* exported in udp.h (was static) */ |
| donatien | 0:632c9925f013 | 69 | struct udp_pcb *udp_pcbs; |
| donatien | 0:632c9925f013 | 70 | |
| donatien | 0:632c9925f013 | 71 | /** |
| donatien | 0:632c9925f013 | 72 | * Process an incoming UDP datagram. |
| donatien | 0:632c9925f013 | 73 | * |
| donatien | 0:632c9925f013 | 74 | * Given an incoming UDP datagram (as a chain of pbufs) this function |
| donatien | 0:632c9925f013 | 75 | * finds a corresponding UDP PCB and hands over the pbuf to the pcbs |
| donatien | 0:632c9925f013 | 76 | * recv function. If no pcb is found or the datagram is incorrect, the |
| donatien | 0:632c9925f013 | 77 | * pbuf is freed. |
| donatien | 0:632c9925f013 | 78 | * |
| donatien | 0:632c9925f013 | 79 | * @param p pbuf to be demultiplexed to a UDP PCB. |
| donatien | 0:632c9925f013 | 80 | * @param inp network interface on which the datagram was received. |
| donatien | 0:632c9925f013 | 81 | * |
| donatien | 0:632c9925f013 | 82 | */ |
| donatien | 0:632c9925f013 | 83 | void |
| donatien | 0:632c9925f013 | 84 | udp_input(struct pbuf *p, struct netif *inp) |
| donatien | 0:632c9925f013 | 85 | { |
| donatien | 0:632c9925f013 | 86 | struct udp_hdr *udphdr; |
| donatien | 0:632c9925f013 | 87 | struct udp_pcb *pcb, *prev; |
| donatien | 0:632c9925f013 | 88 | struct udp_pcb *uncon_pcb; |
| donatien | 0:632c9925f013 | 89 | struct ip_hdr *iphdr; |
| donatien | 0:632c9925f013 | 90 | u16_t src, dest; |
| donatien | 0:632c9925f013 | 91 | u8_t local_match; |
| donatien | 0:632c9925f013 | 92 | u8_t broadcast; |
| donatien | 0:632c9925f013 | 93 | |
| donatien | 0:632c9925f013 | 94 | PERF_START; |
| donatien | 0:632c9925f013 | 95 | |
| donatien | 0:632c9925f013 | 96 | UDP_STATS_INC(udp.recv); |
| donatien | 0:632c9925f013 | 97 | |
| donatien | 0:632c9925f013 | 98 | iphdr = (struct ip_hdr *)p->payload; |
| donatien | 0:632c9925f013 | 99 | |
| donatien | 0:632c9925f013 | 100 | /* Check minimum length (IP header + UDP header) |
| donatien | 0:632c9925f013 | 101 | * and move payload pointer to UDP header */ |
| donatien | 0:632c9925f013 | 102 | if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) { |
| donatien | 0:632c9925f013 | 103 | /* drop short packets */ |
| donatien | 0:632c9925f013 | 104 | LWIP_DEBUGF(UDP_DEBUG, |
| donatien | 0:632c9925f013 | 105 | ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len)); |
| donatien | 0:632c9925f013 | 106 | UDP_STATS_INC(udp.lenerr); |
| donatien | 0:632c9925f013 | 107 | UDP_STATS_INC(udp.drop); |
| donatien | 0:632c9925f013 | 108 | snmp_inc_udpinerrors(); |
| donatien | 0:632c9925f013 | 109 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 110 | goto end; |
| donatien | 0:632c9925f013 | 111 | } |
| donatien | 0:632c9925f013 | 112 | |
| donatien | 0:632c9925f013 | 113 | udphdr = (struct udp_hdr *)p->payload; |
| donatien | 0:632c9925f013 | 114 | |
| donatien | 0:632c9925f013 | 115 | /* is broadcast packet ? */ |
| donatien | 0:632c9925f013 | 116 | broadcast = ip_addr_isbroadcast(&(iphdr->dest), inp); |
| donatien | 0:632c9925f013 | 117 | |
| donatien | 0:632c9925f013 | 118 | LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len)); |
| donatien | 0:632c9925f013 | 119 | |
| donatien | 0:632c9925f013 | 120 | /* convert src and dest ports to host byte order */ |
| donatien | 0:632c9925f013 | 121 | src = ntohs(udphdr->src); |
| donatien | 0:632c9925f013 | 122 | dest = ntohs(udphdr->dest); |
| donatien | 0:632c9925f013 | 123 | |
| donatien | 0:632c9925f013 | 124 | udp_debug_print(udphdr); |
| donatien | 0:632c9925f013 | 125 | |
| donatien | 0:632c9925f013 | 126 | /* print the UDP source and destination */ |
| donatien | 0:632c9925f013 | 127 | LWIP_DEBUGF(UDP_DEBUG, |
| donatien | 0:632c9925f013 | 128 | ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- " |
| donatien | 0:632c9925f013 | 129 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n", |
| donatien | 0:632c9925f013 | 130 | ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest), |
| donatien | 0:632c9925f013 | 131 | ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest), |
| donatien | 0:632c9925f013 | 132 | ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src), |
| donatien | 0:632c9925f013 | 133 | ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src))); |
| donatien | 0:632c9925f013 | 134 | |
| donatien | 0:632c9925f013 | 135 | #if LWIP_DHCP |
| donatien | 0:632c9925f013 | 136 | pcb = NULL; |
| donatien | 0:632c9925f013 | 137 | /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by |
| donatien | 0:632c9925f013 | 138 | the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */ |
| donatien | 0:632c9925f013 | 139 | if (dest == DHCP_CLIENT_PORT) { |
| donatien | 0:632c9925f013 | 140 | /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */ |
| donatien | 0:632c9925f013 | 141 | if (src == DHCP_SERVER_PORT) { |
| donatien | 0:632c9925f013 | 142 | if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) { |
| donatien | 0:632c9925f013 | 143 | /* accept the packe if |
| donatien | 0:632c9925f013 | 144 | (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY! |
| donatien | 0:632c9925f013 | 145 | - inp->dhcp->pcb->remote == ANY or iphdr->src */ |
| donatien | 0:632c9925f013 | 146 | if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) || |
| donatien | 0:632c9925f013 | 147 | ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &(iphdr->src)))) { |
| donatien | 0:632c9925f013 | 148 | pcb = inp->dhcp->pcb; |
| donatien | 0:632c9925f013 | 149 | } |
| donatien | 0:632c9925f013 | 150 | } |
| donatien | 0:632c9925f013 | 151 | } |
| donatien | 0:632c9925f013 | 152 | } else |
| donatien | 0:632c9925f013 | 153 | #endif /* LWIP_DHCP */ |
| donatien | 0:632c9925f013 | 154 | { |
| donatien | 0:632c9925f013 | 155 | prev = NULL; |
| donatien | 0:632c9925f013 | 156 | local_match = 0; |
| donatien | 0:632c9925f013 | 157 | uncon_pcb = NULL; |
| donatien | 0:632c9925f013 | 158 | /* Iterate through the UDP pcb list for a matching pcb. |
| donatien | 0:632c9925f013 | 159 | * 'Perfect match' pcbs (connected to the remote port & ip address) are |
| donatien | 0:632c9925f013 | 160 | * preferred. If no perfect match is found, the first unconnected pcb that |
| donatien | 0:632c9925f013 | 161 | * matches the local port and ip address gets the datagram. */ |
| donatien | 0:632c9925f013 | 162 | for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) { |
| donatien | 0:632c9925f013 | 163 | local_match = 0; |
| donatien | 0:632c9925f013 | 164 | /* print the PCB local and remote address */ |
| donatien | 0:632c9925f013 | 165 | LWIP_DEBUGF(UDP_DEBUG, |
| donatien | 0:632c9925f013 | 166 | ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- " |
| donatien | 0:632c9925f013 | 167 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n", |
| donatien | 0:632c9925f013 | 168 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip), |
| donatien | 0:632c9925f013 | 169 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port, |
| donatien | 0:632c9925f013 | 170 | ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip), |
| donatien | 0:632c9925f013 | 171 | ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port)); |
| donatien | 0:632c9925f013 | 172 | |
| donatien | 0:632c9925f013 | 173 | /* compare PCB local addr+port to UDP destination addr+port */ |
| donatien | 0:632c9925f013 | 174 | if ((pcb->local_port == dest) && |
| donatien | 0:632c9925f013 | 175 | ((!broadcast && ip_addr_isany(&pcb->local_ip)) || |
| donatien | 0:632c9925f013 | 176 | ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)) || |
| donatien | 0:632c9925f013 | 177 | #if LWIP_IGMP |
| donatien | 0:632c9925f013 | 178 | ip_addr_ismulticast(&(iphdr->dest)) || |
| donatien | 0:632c9925f013 | 179 | #endif /* LWIP_IGMP */ |
| donatien | 0:632c9925f013 | 180 | #if IP_SOF_BROADCAST_RECV |
| donatien | 0:632c9925f013 | 181 | (broadcast && (pcb->so_options & SOF_BROADCAST)))) { |
| donatien | 0:632c9925f013 | 182 | #else /* IP_SOF_BROADCAST_RECV */ |
| donatien | 0:632c9925f013 | 183 | (broadcast))) { |
| donatien | 0:632c9925f013 | 184 | #endif /* IP_SOF_BROADCAST_RECV */ |
| donatien | 0:632c9925f013 | 185 | local_match = 1; |
| donatien | 0:632c9925f013 | 186 | if ((uncon_pcb == NULL) && |
| donatien | 0:632c9925f013 | 187 | ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) { |
| donatien | 0:632c9925f013 | 188 | /* the first unconnected matching PCB */ |
| donatien | 0:632c9925f013 | 189 | uncon_pcb = pcb; |
| donatien | 0:632c9925f013 | 190 | } |
| donatien | 0:632c9925f013 | 191 | } |
| donatien | 0:632c9925f013 | 192 | /* compare PCB remote addr+port to UDP source addr+port */ |
| donatien | 0:632c9925f013 | 193 | if ((local_match != 0) && |
| donatien | 0:632c9925f013 | 194 | (pcb->remote_port == src) && |
| donatien | 0:632c9925f013 | 195 | (ip_addr_isany(&pcb->remote_ip) || |
| donatien | 0:632c9925f013 | 196 | ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) { |
| donatien | 0:632c9925f013 | 197 | /* the first fully matching PCB */ |
| donatien | 0:632c9925f013 | 198 | if (prev != NULL) { |
| donatien | 0:632c9925f013 | 199 | /* move the pcb to the front of udp_pcbs so that is |
| donatien | 0:632c9925f013 | 200 | found faster next time */ |
| donatien | 0:632c9925f013 | 201 | prev->next = pcb->next; |
| donatien | 0:632c9925f013 | 202 | pcb->next = udp_pcbs; |
| donatien | 0:632c9925f013 | 203 | udp_pcbs = pcb; |
| donatien | 0:632c9925f013 | 204 | } else { |
| donatien | 0:632c9925f013 | 205 | UDP_STATS_INC(udp.cachehit); |
| donatien | 0:632c9925f013 | 206 | } |
| donatien | 0:632c9925f013 | 207 | break; |
| donatien | 0:632c9925f013 | 208 | } |
| donatien | 0:632c9925f013 | 209 | prev = pcb; |
| donatien | 0:632c9925f013 | 210 | } |
| donatien | 0:632c9925f013 | 211 | /* no fully matching pcb found? then look for an unconnected pcb */ |
| donatien | 0:632c9925f013 | 212 | if (pcb == NULL) { |
| donatien | 0:632c9925f013 | 213 | pcb = uncon_pcb; |
| donatien | 0:632c9925f013 | 214 | } |
| donatien | 0:632c9925f013 | 215 | } |
| donatien | 0:632c9925f013 | 216 | |
| donatien | 0:632c9925f013 | 217 | /* Check checksum if this is a match or if it was directed at us. */ |
| donatien | 0:632c9925f013 | 218 | if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &iphdr->dest)) { |
| donatien | 0:632c9925f013 | 219 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n")); |
| donatien | 0:632c9925f013 | 220 | #if LWIP_UDPLITE |
| donatien | 0:632c9925f013 | 221 | if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) { |
| donatien | 0:632c9925f013 | 222 | /* Do the UDP Lite checksum */ |
| donatien | 0:632c9925f013 | 223 | #if CHECKSUM_CHECK_UDP |
| donatien | 0:632c9925f013 | 224 | u16_t chklen = ntohs(udphdr->len); |
| donatien | 0:632c9925f013 | 225 | if (chklen < sizeof(struct udp_hdr)) { |
| donatien | 0:632c9925f013 | 226 | if (chklen == 0) { |
| donatien | 0:632c9925f013 | 227 | /* For UDP-Lite, checksum length of 0 means checksum |
| donatien | 0:632c9925f013 | 228 | over the complete packet (See RFC 3828 chap. 3.1) */ |
| donatien | 0:632c9925f013 | 229 | chklen = p->tot_len; |
| donatien | 0:632c9925f013 | 230 | } else { |
| donatien | 0:632c9925f013 | 231 | /* At least the UDP-Lite header must be covered by the |
| donatien | 0:632c9925f013 | 232 | checksum! (Again, see RFC 3828 chap. 3.1) */ |
| donatien | 0:632c9925f013 | 233 | UDP_STATS_INC(udp.chkerr); |
| donatien | 0:632c9925f013 | 234 | UDP_STATS_INC(udp.drop); |
| donatien | 0:632c9925f013 | 235 | snmp_inc_udpinerrors(); |
| donatien | 0:632c9925f013 | 236 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 237 | goto end; |
| donatien | 0:632c9925f013 | 238 | } |
| donatien | 0:632c9925f013 | 239 | } |
| donatien | 0:632c9925f013 | 240 | if (inet_chksum_pseudo_partial(p, &iphdr->src, &iphdr->dest, |
| donatien | 0:632c9925f013 | 241 | IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) { |
| donatien | 0:632c9925f013 | 242 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, |
| donatien | 0:632c9925f013 | 243 | ("udp_input: UDP Lite datagram discarded due to failing checksum\n")); |
| donatien | 0:632c9925f013 | 244 | UDP_STATS_INC(udp.chkerr); |
| donatien | 0:632c9925f013 | 245 | UDP_STATS_INC(udp.drop); |
| donatien | 0:632c9925f013 | 246 | snmp_inc_udpinerrors(); |
| donatien | 0:632c9925f013 | 247 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 248 | goto end; |
| donatien | 0:632c9925f013 | 249 | } |
| donatien | 0:632c9925f013 | 250 | #endif /* CHECKSUM_CHECK_UDP */ |
| donatien | 0:632c9925f013 | 251 | } else |
| donatien | 0:632c9925f013 | 252 | #endif /* LWIP_UDPLITE */ |
| donatien | 0:632c9925f013 | 253 | { |
| donatien | 0:632c9925f013 | 254 | #if CHECKSUM_CHECK_UDP |
| donatien | 0:632c9925f013 | 255 | if (udphdr->chksum != 0) { |
| donatien | 0:632c9925f013 | 256 | if (inet_chksum_pseudo(p, &iphdr->src, &iphdr->dest, |
| donatien | 0:632c9925f013 | 257 | IP_PROTO_UDP, p->tot_len) != 0) { |
| donatien | 0:632c9925f013 | 258 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, |
| donatien | 0:632c9925f013 | 259 | ("udp_input: UDP datagram discarded due to failing checksum\n")); |
| donatien | 0:632c9925f013 | 260 | UDP_STATS_INC(udp.chkerr); |
| donatien | 0:632c9925f013 | 261 | UDP_STATS_INC(udp.drop); |
| donatien | 0:632c9925f013 | 262 | snmp_inc_udpinerrors(); |
| donatien | 0:632c9925f013 | 263 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 264 | goto end; |
| donatien | 0:632c9925f013 | 265 | } |
| donatien | 0:632c9925f013 | 266 | } |
| donatien | 0:632c9925f013 | 267 | #endif /* CHECKSUM_CHECK_UDP */ |
| donatien | 0:632c9925f013 | 268 | } |
| donatien | 0:632c9925f013 | 269 | if(pbuf_header(p, -UDP_HLEN)) { |
| donatien | 0:632c9925f013 | 270 | /* Can we cope with this failing? Just assert for now */ |
| donatien | 0:632c9925f013 | 271 | LWIP_ASSERT("pbuf_header failed\n", 0); |
| donatien | 0:632c9925f013 | 272 | UDP_STATS_INC(udp.drop); |
| donatien | 0:632c9925f013 | 273 | snmp_inc_udpinerrors(); |
| donatien | 0:632c9925f013 | 274 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 275 | goto end; |
| donatien | 0:632c9925f013 | 276 | } |
| donatien | 0:632c9925f013 | 277 | if (pcb != NULL) { |
| donatien | 0:632c9925f013 | 278 | snmp_inc_udpindatagrams(); |
| donatien | 0:632c9925f013 | 279 | /* callback */ |
| donatien | 0:632c9925f013 | 280 | if (pcb->recv != NULL) { |
| donatien | 0:632c9925f013 | 281 | /* now the recv function is responsible for freeing p */ |
| donatien | 0:632c9925f013 | 282 | pcb->recv(pcb->recv_arg, pcb, p, &iphdr->src, src); |
| donatien | 0:632c9925f013 | 283 | } else { |
| donatien | 0:632c9925f013 | 284 | /* no recv function registered? then we have to free the pbuf! */ |
| donatien | 0:632c9925f013 | 285 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 286 | goto end; |
| donatien | 0:632c9925f013 | 287 | } |
| donatien | 0:632c9925f013 | 288 | } else { |
| donatien | 0:632c9925f013 | 289 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n")); |
| donatien | 0:632c9925f013 | 290 | |
| donatien | 0:632c9925f013 | 291 | #if LWIP_ICMP |
| donatien | 0:632c9925f013 | 292 | /* No match was found, send ICMP destination port unreachable unless |
| donatien | 0:632c9925f013 | 293 | destination address was broadcast/multicast. */ |
| donatien | 0:632c9925f013 | 294 | if (!broadcast && |
| donatien | 0:632c9925f013 | 295 | !ip_addr_ismulticast(&iphdr->dest)) { |
| donatien | 0:632c9925f013 | 296 | /* move payload pointer back to ip header */ |
| donatien | 0:632c9925f013 | 297 | pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN); |
| donatien | 0:632c9925f013 | 298 | LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr)); |
| donatien | 0:632c9925f013 | 299 | icmp_dest_unreach(p, ICMP_DUR_PORT); |
| donatien | 0:632c9925f013 | 300 | } |
| donatien | 0:632c9925f013 | 301 | #endif /* LWIP_ICMP */ |
| donatien | 0:632c9925f013 | 302 | UDP_STATS_INC(udp.proterr); |
| donatien | 0:632c9925f013 | 303 | UDP_STATS_INC(udp.drop); |
| donatien | 0:632c9925f013 | 304 | snmp_inc_udpnoports(); |
| donatien | 0:632c9925f013 | 305 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 306 | } |
| donatien | 0:632c9925f013 | 307 | } else { |
| donatien | 0:632c9925f013 | 308 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 309 | } |
| donatien | 0:632c9925f013 | 310 | end: |
| donatien | 0:632c9925f013 | 311 | PERF_STOP("udp_input"); |
| donatien | 0:632c9925f013 | 312 | } |
| donatien | 0:632c9925f013 | 313 | |
| donatien | 0:632c9925f013 | 314 | /** |
| donatien | 0:632c9925f013 | 315 | * Send data using UDP. |
| donatien | 0:632c9925f013 | 316 | * |
| donatien | 0:632c9925f013 | 317 | * @param pcb UDP PCB used to send the data. |
| donatien | 0:632c9925f013 | 318 | * @param p chain of pbuf's to be sent. |
| donatien | 0:632c9925f013 | 319 | * |
| donatien | 0:632c9925f013 | 320 | * The datagram will be sent to the current remote_ip & remote_port |
| donatien | 0:632c9925f013 | 321 | * stored in pcb. If the pcb is not bound to a port, it will |
| donatien | 0:632c9925f013 | 322 | * automatically be bound to a random port. |
| donatien | 0:632c9925f013 | 323 | * |
| donatien | 0:632c9925f013 | 324 | * @return lwIP error code. |
| donatien | 0:632c9925f013 | 325 | * - ERR_OK. Successful. No error occured. |
| donatien | 0:632c9925f013 | 326 | * - ERR_MEM. Out of memory. |
| donatien | 0:632c9925f013 | 327 | * - ERR_RTE. Could not find route to destination address. |
| donatien | 0:632c9925f013 | 328 | * - More errors could be returned by lower protocol layers. |
| donatien | 0:632c9925f013 | 329 | * |
| donatien | 0:632c9925f013 | 330 | * @see udp_disconnect() udp_sendto() |
| donatien | 0:632c9925f013 | 331 | */ |
| donatien | 0:632c9925f013 | 332 | err_t |
| donatien | 0:632c9925f013 | 333 | udp_send(struct udp_pcb *pcb, struct pbuf *p) |
| donatien | 0:632c9925f013 | 334 | { |
| donatien | 0:632c9925f013 | 335 | /* send to the packet using remote ip and port stored in the pcb */ |
| donatien | 0:632c9925f013 | 336 | return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port); |
| donatien | 0:632c9925f013 | 337 | } |
| donatien | 0:632c9925f013 | 338 | |
| donatien | 0:632c9925f013 | 339 | /** |
| donatien | 0:632c9925f013 | 340 | * Send data to a specified address using UDP. |
| donatien | 0:632c9925f013 | 341 | * |
| donatien | 0:632c9925f013 | 342 | * @param pcb UDP PCB used to send the data. |
| donatien | 0:632c9925f013 | 343 | * @param p chain of pbuf's to be sent. |
| donatien | 0:632c9925f013 | 344 | * @param dst_ip Destination IP address. |
| donatien | 0:632c9925f013 | 345 | * @param dst_port Destination UDP port. |
| donatien | 0:632c9925f013 | 346 | * |
| donatien | 0:632c9925f013 | 347 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb. |
| donatien | 0:632c9925f013 | 348 | * |
| donatien | 0:632c9925f013 | 349 | * If the PCB already has a remote address association, it will |
| donatien | 0:632c9925f013 | 350 | * be restored after the data is sent. |
| donatien | 0:632c9925f013 | 351 | * |
| donatien | 0:632c9925f013 | 352 | * @return lwIP error code (@see udp_send for possible error codes) |
| donatien | 0:632c9925f013 | 353 | * |
| donatien | 0:632c9925f013 | 354 | * @see udp_disconnect() udp_send() |
| donatien | 0:632c9925f013 | 355 | */ |
| donatien | 0:632c9925f013 | 356 | err_t |
| donatien | 0:632c9925f013 | 357 | udp_sendto(struct udp_pcb *pcb, struct pbuf *p, |
| donatien | 0:632c9925f013 | 358 | ip_addr_t *dst_ip, u16_t dst_port) |
| donatien | 0:632c9925f013 | 359 | { |
| donatien | 0:632c9925f013 | 360 | struct netif *netif; |
| donatien | 0:632c9925f013 | 361 | |
| donatien | 0:632c9925f013 | 362 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n")); |
| donatien | 0:632c9925f013 | 363 | |
| donatien | 0:632c9925f013 | 364 | /* find the outgoing network interface for this packet */ |
| donatien | 0:632c9925f013 | 365 | #if LWIP_IGMP |
| donatien | 0:632c9925f013 | 366 | netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip)); |
| donatien | 0:632c9925f013 | 367 | #else |
| donatien | 0:632c9925f013 | 368 | netif = ip_route(dst_ip); |
| donatien | 0:632c9925f013 | 369 | #endif /* LWIP_IGMP */ |
| donatien | 0:632c9925f013 | 370 | |
| donatien | 0:632c9925f013 | 371 | /* no outgoing network interface could be found? */ |
| donatien | 0:632c9925f013 | 372 | if (netif == NULL) { |
| donatien | 0:632c9925f013 | 373 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| donatien | 0:632c9925f013 | 374 | ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip))); |
| donatien | 0:632c9925f013 | 375 | UDP_STATS_INC(udp.rterr); |
| donatien | 0:632c9925f013 | 376 | return ERR_RTE; |
| donatien | 0:632c9925f013 | 377 | } |
| donatien | 0:632c9925f013 | 378 | return udp_sendto_if(pcb, p, dst_ip, dst_port, netif); |
| donatien | 0:632c9925f013 | 379 | } |
| donatien | 0:632c9925f013 | 380 | |
| donatien | 0:632c9925f013 | 381 | /** |
| donatien | 0:632c9925f013 | 382 | * Send data to a specified address using UDP. |
| donatien | 0:632c9925f013 | 383 | * The netif used for sending can be specified. |
| donatien | 0:632c9925f013 | 384 | * |
| donatien | 0:632c9925f013 | 385 | * This function exists mainly for DHCP, to be able to send UDP packets |
| donatien | 0:632c9925f013 | 386 | * on a netif that is still down. |
| donatien | 0:632c9925f013 | 387 | * |
| donatien | 0:632c9925f013 | 388 | * @param pcb UDP PCB used to send the data. |
| donatien | 0:632c9925f013 | 389 | * @param p chain of pbuf's to be sent. |
| donatien | 0:632c9925f013 | 390 | * @param dst_ip Destination IP address. |
| donatien | 0:632c9925f013 | 391 | * @param dst_port Destination UDP port. |
| donatien | 0:632c9925f013 | 392 | * @param netif the netif used for sending. |
| donatien | 0:632c9925f013 | 393 | * |
| donatien | 0:632c9925f013 | 394 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb. |
| donatien | 0:632c9925f013 | 395 | * |
| donatien | 0:632c9925f013 | 396 | * @return lwIP error code (@see udp_send for possible error codes) |
| donatien | 0:632c9925f013 | 397 | * |
| donatien | 0:632c9925f013 | 398 | * @see udp_disconnect() udp_send() |
| donatien | 0:632c9925f013 | 399 | */ |
| donatien | 0:632c9925f013 | 400 | err_t |
| donatien | 0:632c9925f013 | 401 | udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p, |
| donatien | 0:632c9925f013 | 402 | ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif) |
| donatien | 0:632c9925f013 | 403 | { |
| donatien | 0:632c9925f013 | 404 | struct udp_hdr *udphdr; |
| donatien | 0:632c9925f013 | 405 | ip_addr_t *src_ip; |
| donatien | 0:632c9925f013 | 406 | err_t err; |
| donatien | 0:632c9925f013 | 407 | struct pbuf *q; /* q will be sent down the stack */ |
| donatien | 0:632c9925f013 | 408 | |
| donatien | 0:632c9925f013 | 409 | #if IP_SOF_BROADCAST |
| donatien | 0:632c9925f013 | 410 | /* broadcast filter? */ |
| donatien | 0:632c9925f013 | 411 | if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) { |
| donatien | 0:632c9925f013 | 412 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, |
| donatien | 0:632c9925f013 | 413 | ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb)); |
| donatien | 0:632c9925f013 | 414 | return ERR_VAL; |
| donatien | 0:632c9925f013 | 415 | } |
| donatien | 0:632c9925f013 | 416 | #endif /* IP_SOF_BROADCAST */ |
| donatien | 0:632c9925f013 | 417 | |
| donatien | 0:632c9925f013 | 418 | /* if the PCB is not yet bound to a port, bind it here */ |
| donatien | 0:632c9925f013 | 419 | if (pcb->local_port == 0) { |
| donatien | 0:632c9925f013 | 420 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n")); |
| donatien | 0:632c9925f013 | 421 | err = udp_bind(pcb, &pcb->local_ip, pcb->local_port); |
| donatien | 0:632c9925f013 | 422 | if (err != ERR_OK) { |
| donatien | 0:632c9925f013 | 423 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n")); |
| donatien | 0:632c9925f013 | 424 | return err; |
| donatien | 0:632c9925f013 | 425 | } |
| donatien | 0:632c9925f013 | 426 | } |
| donatien | 0:632c9925f013 | 427 | |
| donatien | 0:632c9925f013 | 428 | /* not enough space to add an UDP header to first pbuf in given p chain? */ |
| donatien | 0:632c9925f013 | 429 | if (pbuf_header(p, UDP_HLEN)) { |
| donatien | 0:632c9925f013 | 430 | /* allocate header in a separate new pbuf */ |
| donatien | 0:632c9925f013 | 431 | q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM); |
| donatien | 0:632c9925f013 | 432 | /* new header pbuf could not be allocated? */ |
| donatien | 0:632c9925f013 | 433 | if (q == NULL) { |
| donatien | 0:632c9925f013 | 434 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n")); |
| donatien | 0:632c9925f013 | 435 | return ERR_MEM; |
| donatien | 0:632c9925f013 | 436 | } |
| donatien | 0:632c9925f013 | 437 | /* chain header q in front of given pbuf p */ |
| donatien | 0:632c9925f013 | 438 | pbuf_chain(q, p); |
| donatien | 0:632c9925f013 | 439 | /* first pbuf q points to header pbuf */ |
| donatien | 0:632c9925f013 | 440 | LWIP_DEBUGF(UDP_DEBUG, |
| donatien | 0:632c9925f013 | 441 | ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p)); |
| donatien | 0:632c9925f013 | 442 | } else { |
| donatien | 0:632c9925f013 | 443 | /* adding space for header within p succeeded */ |
| donatien | 0:632c9925f013 | 444 | /* first pbuf q equals given pbuf */ |
| donatien | 0:632c9925f013 | 445 | q = p; |
| donatien | 0:632c9925f013 | 446 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p)); |
| donatien | 0:632c9925f013 | 447 | } |
| donatien | 0:632c9925f013 | 448 | LWIP_ASSERT("check that first pbuf can hold struct udp_hdr", |
| donatien | 0:632c9925f013 | 449 | (q->len >= sizeof(struct udp_hdr))); |
| donatien | 0:632c9925f013 | 450 | /* q now represents the packet to be sent */ |
| donatien | 0:632c9925f013 | 451 | udphdr = (struct udp_hdr *)q->payload; |
| donatien | 0:632c9925f013 | 452 | udphdr->src = htons(pcb->local_port); |
| donatien | 0:632c9925f013 | 453 | udphdr->dest = htons(dst_port); |
| donatien | 0:632c9925f013 | 454 | /* in UDP, 0 checksum means 'no checksum' */ |
| donatien | 0:632c9925f013 | 455 | udphdr->chksum = 0x0000; |
| donatien | 0:632c9925f013 | 456 | |
| donatien | 0:632c9925f013 | 457 | /* PCB local address is IP_ANY_ADDR? */ |
| donatien | 0:632c9925f013 | 458 | if (ip_addr_isany(&pcb->local_ip)) { |
| donatien | 0:632c9925f013 | 459 | /* use outgoing network interface IP address as source address */ |
| donatien | 0:632c9925f013 | 460 | src_ip = &(netif->ip_addr); |
| donatien | 0:632c9925f013 | 461 | } else { |
| donatien | 0:632c9925f013 | 462 | /* check if UDP PCB local IP address is correct |
| donatien | 0:632c9925f013 | 463 | * this could be an old address if netif->ip_addr has changed */ |
| donatien | 0:632c9925f013 | 464 | if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) { |
| donatien | 0:632c9925f013 | 465 | /* local_ip doesn't match, drop the packet */ |
| donatien | 0:632c9925f013 | 466 | if (q != p) { |
| donatien | 0:632c9925f013 | 467 | /* free the header pbuf */ |
| donatien | 0:632c9925f013 | 468 | pbuf_free(q); |
| donatien | 0:632c9925f013 | 469 | q = NULL; |
| donatien | 0:632c9925f013 | 470 | /* p is still referenced by the caller, and will live on */ |
| donatien | 0:632c9925f013 | 471 | } |
| donatien | 0:632c9925f013 | 472 | return ERR_VAL; |
| donatien | 0:632c9925f013 | 473 | } |
| donatien | 0:632c9925f013 | 474 | /* use UDP PCB local IP address as source address */ |
| donatien | 0:632c9925f013 | 475 | src_ip = &(pcb->local_ip); |
| donatien | 0:632c9925f013 | 476 | } |
| donatien | 0:632c9925f013 | 477 | |
| donatien | 0:632c9925f013 | 478 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len)); |
| donatien | 0:632c9925f013 | 479 | |
| donatien | 0:632c9925f013 | 480 | #if LWIP_UDPLITE |
| donatien | 0:632c9925f013 | 481 | /* UDP Lite protocol? */ |
| donatien | 0:632c9925f013 | 482 | if (pcb->flags & UDP_FLAGS_UDPLITE) { |
| donatien | 0:632c9925f013 | 483 | u16_t chklen, chklen_hdr; |
| donatien | 0:632c9925f013 | 484 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len)); |
| donatien | 0:632c9925f013 | 485 | /* set UDP message length in UDP header */ |
| donatien | 0:632c9925f013 | 486 | chklen_hdr = chklen = pcb->chksum_len_tx; |
| donatien | 0:632c9925f013 | 487 | if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) { |
| donatien | 0:632c9925f013 | 488 | if (chklen != 0) { |
| donatien | 0:632c9925f013 | 489 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen)); |
| donatien | 0:632c9925f013 | 490 | } |
| donatien | 0:632c9925f013 | 491 | /* For UDP-Lite, checksum length of 0 means checksum |
| donatien | 0:632c9925f013 | 492 | over the complete packet. (See RFC 3828 chap. 3.1) |
| donatien | 0:632c9925f013 | 493 | At least the UDP-Lite header must be covered by the |
| donatien | 0:632c9925f013 | 494 | checksum, therefore, if chksum_len has an illegal |
| donatien | 0:632c9925f013 | 495 | value, we generate the checksum over the complete |
| donatien | 0:632c9925f013 | 496 | packet to be safe. */ |
| donatien | 0:632c9925f013 | 497 | chklen_hdr = 0; |
| donatien | 0:632c9925f013 | 498 | chklen = q->tot_len; |
| donatien | 0:632c9925f013 | 499 | } |
| donatien | 0:632c9925f013 | 500 | udphdr->len = htons(chklen_hdr); |
| donatien | 0:632c9925f013 | 501 | /* calculate checksum */ |
| donatien | 0:632c9925f013 | 502 | #if CHECKSUM_GEN_UDP |
| donatien | 0:632c9925f013 | 503 | udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, |
| donatien | 0:632c9925f013 | 504 | IP_PROTO_UDPLITE, q->tot_len, chklen); |
| donatien | 0:632c9925f013 | 505 | /* chksum zero must become 0xffff, as zero means 'no checksum' */ |
| donatien | 0:632c9925f013 | 506 | if (udphdr->chksum == 0x0000) { |
| donatien | 0:632c9925f013 | 507 | udphdr->chksum = 0xffff; |
| donatien | 0:632c9925f013 | 508 | } |
| donatien | 0:632c9925f013 | 509 | #endif /* CHECKSUM_GEN_UDP */ |
| donatien | 0:632c9925f013 | 510 | /* output to IP */ |
| donatien | 0:632c9925f013 | 511 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n")); |
| donatien | 0:632c9925f013 | 512 | #if LWIP_NETIF_HWADDRHINT |
| donatien | 0:632c9925f013 | 513 | netif->addr_hint = &(pcb->addr_hint); |
| donatien | 0:632c9925f013 | 514 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| donatien | 0:632c9925f013 | 515 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif); |
| donatien | 0:632c9925f013 | 516 | #if LWIP_NETIF_HWADDRHINT |
| donatien | 0:632c9925f013 | 517 | netif->addr_hint = NULL; |
| donatien | 0:632c9925f013 | 518 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| donatien | 0:632c9925f013 | 519 | } else |
| donatien | 0:632c9925f013 | 520 | #endif /* LWIP_UDPLITE */ |
| donatien | 0:632c9925f013 | 521 | { /* UDP */ |
| donatien | 0:632c9925f013 | 522 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len)); |
| donatien | 0:632c9925f013 | 523 | udphdr->len = htons(q->tot_len); |
| donatien | 0:632c9925f013 | 524 | /* calculate checksum */ |
| donatien | 0:632c9925f013 | 525 | #if CHECKSUM_GEN_UDP |
| donatien | 0:632c9925f013 | 526 | if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) { |
| donatien | 0:632c9925f013 | 527 | udphdr->chksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len); |
| donatien | 0:632c9925f013 | 528 | /* chksum zero must become 0xffff, as zero means 'no checksum' */ |
| donatien | 0:632c9925f013 | 529 | if (udphdr->chksum == 0x0000) { |
| donatien | 0:632c9925f013 | 530 | udphdr->chksum = 0xffff; |
| donatien | 0:632c9925f013 | 531 | } |
| donatien | 0:632c9925f013 | 532 | } |
| donatien | 0:632c9925f013 | 533 | #endif /* CHECKSUM_GEN_UDP */ |
| donatien | 0:632c9925f013 | 534 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum)); |
| donatien | 0:632c9925f013 | 535 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n")); |
| donatien | 0:632c9925f013 | 536 | /* output to IP */ |
| donatien | 0:632c9925f013 | 537 | #if LWIP_NETIF_HWADDRHINT |
| donatien | 0:632c9925f013 | 538 | netif->addr_hint = &(pcb->addr_hint); |
| donatien | 0:632c9925f013 | 539 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| donatien | 0:632c9925f013 | 540 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif); |
| donatien | 0:632c9925f013 | 541 | #if LWIP_NETIF_HWADDRHINT |
| donatien | 0:632c9925f013 | 542 | netif->addr_hint = NULL; |
| donatien | 0:632c9925f013 | 543 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| donatien | 0:632c9925f013 | 544 | } |
| donatien | 0:632c9925f013 | 545 | /* TODO: must this be increased even if error occured? */ |
| donatien | 0:632c9925f013 | 546 | snmp_inc_udpoutdatagrams(); |
| donatien | 0:632c9925f013 | 547 | |
| donatien | 0:632c9925f013 | 548 | /* did we chain a separate header pbuf earlier? */ |
| donatien | 0:632c9925f013 | 549 | if (q != p) { |
| donatien | 0:632c9925f013 | 550 | /* free the header pbuf */ |
| donatien | 0:632c9925f013 | 551 | pbuf_free(q); |
| donatien | 0:632c9925f013 | 552 | q = NULL; |
| donatien | 0:632c9925f013 | 553 | /* p is still referenced by the caller, and will live on */ |
| donatien | 0:632c9925f013 | 554 | } |
| donatien | 0:632c9925f013 | 555 | |
| donatien | 0:632c9925f013 | 556 | UDP_STATS_INC(udp.xmit); |
| donatien | 0:632c9925f013 | 557 | return err; |
| donatien | 0:632c9925f013 | 558 | } |
| donatien | 0:632c9925f013 | 559 | |
| donatien | 0:632c9925f013 | 560 | /** |
| donatien | 0:632c9925f013 | 561 | * Bind an UDP PCB. |
| donatien | 0:632c9925f013 | 562 | * |
| donatien | 0:632c9925f013 | 563 | * @param pcb UDP PCB to be bound with a local address ipaddr and port. |
| donatien | 0:632c9925f013 | 564 | * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to |
| donatien | 0:632c9925f013 | 565 | * bind to all local interfaces. |
| donatien | 0:632c9925f013 | 566 | * @param port local UDP port to bind with. Use 0 to automatically bind |
| donatien | 0:632c9925f013 | 567 | * to a random port between UDP_LOCAL_PORT_RANGE_START and |
| donatien | 0:632c9925f013 | 568 | * UDP_LOCAL_PORT_RANGE_END. |
| donatien | 0:632c9925f013 | 569 | * |
| donatien | 0:632c9925f013 | 570 | * ipaddr & port are expected to be in the same byte order as in the pcb. |
| donatien | 0:632c9925f013 | 571 | * |
| donatien | 0:632c9925f013 | 572 | * @return lwIP error code. |
| donatien | 0:632c9925f013 | 573 | * - ERR_OK. Successful. No error occured. |
| donatien | 0:632c9925f013 | 574 | * - ERR_USE. The specified ipaddr and port are already bound to by |
| donatien | 0:632c9925f013 | 575 | * another UDP PCB. |
| donatien | 0:632c9925f013 | 576 | * |
| donatien | 0:632c9925f013 | 577 | * @see udp_disconnect() |
| donatien | 0:632c9925f013 | 578 | */ |
| donatien | 0:632c9925f013 | 579 | err_t |
| donatien | 0:632c9925f013 | 580 | udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port) |
| donatien | 0:632c9925f013 | 581 | { |
| donatien | 0:632c9925f013 | 582 | struct udp_pcb *ipcb; |
| donatien | 0:632c9925f013 | 583 | u8_t rebind; |
| donatien | 0:632c9925f013 | 584 | |
| donatien | 0:632c9925f013 | 585 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = ")); |
| donatien | 0:632c9925f013 | 586 | ip_addr_debug_print(UDP_DEBUG, ipaddr); |
| donatien | 0:632c9925f013 | 587 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port)); |
| donatien | 0:632c9925f013 | 588 | |
| donatien | 0:632c9925f013 | 589 | rebind = 0; |
| donatien | 0:632c9925f013 | 590 | /* Check for double bind and rebind of the same pcb */ |
| donatien | 0:632c9925f013 | 591 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) { |
| donatien | 0:632c9925f013 | 592 | /* is this UDP PCB already on active list? */ |
| donatien | 0:632c9925f013 | 593 | if (pcb == ipcb) { |
| donatien | 0:632c9925f013 | 594 | /* pcb may occur at most once in active list */ |
| donatien | 0:632c9925f013 | 595 | LWIP_ASSERT("rebind == 0", rebind == 0); |
| donatien | 0:632c9925f013 | 596 | /* pcb already in list, just rebind */ |
| donatien | 0:632c9925f013 | 597 | rebind = 1; |
| donatien | 0:632c9925f013 | 598 | } |
| donatien | 0:632c9925f013 | 599 | |
| donatien | 0:632c9925f013 | 600 | /* this code does not allow upper layer to share a UDP port for |
| donatien | 0:632c9925f013 | 601 | listening to broadcast or multicast traffic (See SO_REUSEADDR and |
| donatien | 0:632c9925f013 | 602 | SO_REUSEPORT under *BSD). TODO: See where it fits instead, OR |
| donatien | 0:632c9925f013 | 603 | combine with implementation of UDP PCB flags. Leon Woestenberg. */ |
| donatien | 0:632c9925f013 | 604 | #ifdef LWIP_UDP_TODO |
| donatien | 0:632c9925f013 | 605 | /* port matches that of PCB in list? */ |
| donatien | 0:632c9925f013 | 606 | else { |
| donatien | 0:632c9925f013 | 607 | if ((ipcb->local_port == port) && |
| donatien | 0:632c9925f013 | 608 | /* IP address matches, or one is IP_ADDR_ANY? */ |
| donatien | 0:632c9925f013 | 609 | (ip_addr_isany(&(ipcb->local_ip)) || |
| donatien | 0:632c9925f013 | 610 | ip_addr_isany(ipaddr) || |
| donatien | 0:632c9925f013 | 611 | ip_addr_cmp(&(ipcb->local_ip), ipaddr))) { |
| donatien | 0:632c9925f013 | 612 | /* other PCB already binds to this local IP and port */ |
| donatien | 0:632c9925f013 | 613 | LWIP_DEBUGF(UDP_DEBUG, |
| donatien | 0:632c9925f013 | 614 | ("udp_bind: local port %"U16_F" already bound by another pcb\n", port)); |
| donatien | 0:632c9925f013 | 615 | return ERR_USE; |
| donatien | 0:632c9925f013 | 616 | } |
| donatien | 0:632c9925f013 | 617 | } |
| donatien | 0:632c9925f013 | 618 | #endif |
| donatien | 0:632c9925f013 | 619 | } |
| donatien | 0:632c9925f013 | 620 | |
| donatien | 0:632c9925f013 | 621 | ip_addr_set(&pcb->local_ip, ipaddr); |
| donatien | 0:632c9925f013 | 622 | |
| donatien | 0:632c9925f013 | 623 | /* no port specified? */ |
| donatien | 0:632c9925f013 | 624 | if (port == 0) { |
| donatien | 0:632c9925f013 | 625 | #ifndef UDP_LOCAL_PORT_RANGE_START |
| donatien | 0:632c9925f013 | 626 | #define UDP_LOCAL_PORT_RANGE_START 4096 |
| donatien | 0:632c9925f013 | 627 | #define UDP_LOCAL_PORT_RANGE_END 0x7fff |
| donatien | 0:632c9925f013 | 628 | #endif |
| donatien | 0:632c9925f013 | 629 | port = UDP_LOCAL_PORT_RANGE_START; |
| donatien | 0:632c9925f013 | 630 | ipcb = udp_pcbs; |
| donatien | 0:632c9925f013 | 631 | while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) { |
| donatien | 0:632c9925f013 | 632 | if (ipcb->local_port == port) { |
| donatien | 0:632c9925f013 | 633 | /* port is already used by another udp_pcb */ |
| donatien | 0:632c9925f013 | 634 | port++; |
| donatien | 0:632c9925f013 | 635 | /* restart scanning all udp pcbs */ |
| donatien | 0:632c9925f013 | 636 | ipcb = udp_pcbs; |
| donatien | 0:632c9925f013 | 637 | } else { |
| donatien | 0:632c9925f013 | 638 | /* go on with next udp pcb */ |
| donatien | 0:632c9925f013 | 639 | ipcb = ipcb->next; |
| donatien | 0:632c9925f013 | 640 | } |
| donatien | 0:632c9925f013 | 641 | } |
| donatien | 0:632c9925f013 | 642 | if (ipcb != NULL) { |
| donatien | 0:632c9925f013 | 643 | /* no more ports available in local range */ |
| donatien | 0:632c9925f013 | 644 | LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n")); |
| donatien | 0:632c9925f013 | 645 | return ERR_USE; |
| donatien | 0:632c9925f013 | 646 | } |
| donatien | 0:632c9925f013 | 647 | } |
| donatien | 0:632c9925f013 | 648 | pcb->local_port = port; |
| donatien | 0:632c9925f013 | 649 | snmp_insert_udpidx_tree(pcb); |
| donatien | 0:632c9925f013 | 650 | /* pcb not active yet? */ |
| donatien | 0:632c9925f013 | 651 | if (rebind == 0) { |
| donatien | 0:632c9925f013 | 652 | /* place the PCB on the active list if not already there */ |
| donatien | 0:632c9925f013 | 653 | pcb->next = udp_pcbs; |
| donatien | 0:632c9925f013 | 654 | udp_pcbs = pcb; |
| donatien | 0:632c9925f013 | 655 | } |
| donatien | 0:632c9925f013 | 656 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:632c9925f013 | 657 | ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n", |
| donatien | 0:632c9925f013 | 658 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip), |
| donatien | 0:632c9925f013 | 659 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), |
| donatien | 0:632c9925f013 | 660 | pcb->local_port)); |
| donatien | 0:632c9925f013 | 661 | return ERR_OK; |
| donatien | 0:632c9925f013 | 662 | } |
| donatien | 0:632c9925f013 | 663 | /** |
| donatien | 0:632c9925f013 | 664 | * Connect an UDP PCB. |
| donatien | 0:632c9925f013 | 665 | * |
| donatien | 0:632c9925f013 | 666 | * This will associate the UDP PCB with the remote address. |
| donatien | 0:632c9925f013 | 667 | * |
| donatien | 0:632c9925f013 | 668 | * @param pcb UDP PCB to be connected with remote address ipaddr and port. |
| donatien | 0:632c9925f013 | 669 | * @param ipaddr remote IP address to connect with. |
| donatien | 0:632c9925f013 | 670 | * @param port remote UDP port to connect with. |
| donatien | 0:632c9925f013 | 671 | * |
| donatien | 0:632c9925f013 | 672 | * @return lwIP error code |
| donatien | 0:632c9925f013 | 673 | * |
| donatien | 0:632c9925f013 | 674 | * ipaddr & port are expected to be in the same byte order as in the pcb. |
| donatien | 0:632c9925f013 | 675 | * |
| donatien | 0:632c9925f013 | 676 | * The udp pcb is bound to a random local port if not already bound. |
| donatien | 0:632c9925f013 | 677 | * |
| donatien | 0:632c9925f013 | 678 | * @see udp_disconnect() |
| donatien | 0:632c9925f013 | 679 | */ |
| donatien | 0:632c9925f013 | 680 | err_t |
| donatien | 0:632c9925f013 | 681 | udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port) |
| donatien | 0:632c9925f013 | 682 | { |
| donatien | 0:632c9925f013 | 683 | struct udp_pcb *ipcb; |
| donatien | 0:632c9925f013 | 684 | |
| donatien | 0:632c9925f013 | 685 | if (pcb->local_port == 0) { |
| donatien | 0:632c9925f013 | 686 | err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port); |
| donatien | 0:632c9925f013 | 687 | if (err != ERR_OK) { |
| donatien | 0:632c9925f013 | 688 | return err; |
| donatien | 0:632c9925f013 | 689 | } |
| donatien | 0:632c9925f013 | 690 | } |
| donatien | 0:632c9925f013 | 691 | |
| donatien | 0:632c9925f013 | 692 | ip_addr_set(&pcb->remote_ip, ipaddr); |
| donatien | 0:632c9925f013 | 693 | pcb->remote_port = port; |
| donatien | 0:632c9925f013 | 694 | pcb->flags |= UDP_FLAGS_CONNECTED; |
| donatien | 0:632c9925f013 | 695 | /** TODO: this functionality belongs in upper layers */ |
| donatien | 0:632c9925f013 | 696 | #ifdef LWIP_UDP_TODO |
| donatien | 0:632c9925f013 | 697 | /* Nail down local IP for netconn_addr()/getsockname() */ |
| donatien | 0:632c9925f013 | 698 | if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) { |
| donatien | 0:632c9925f013 | 699 | struct netif *netif; |
| donatien | 0:632c9925f013 | 700 | |
| donatien | 0:632c9925f013 | 701 | if ((netif = ip_route(&(pcb->remote_ip))) == NULL) { |
| donatien | 0:632c9925f013 | 702 | LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr)); |
| donatien | 0:632c9925f013 | 703 | UDP_STATS_INC(udp.rterr); |
| donatien | 0:632c9925f013 | 704 | return ERR_RTE; |
| donatien | 0:632c9925f013 | 705 | } |
| donatien | 0:632c9925f013 | 706 | /** TODO: this will bind the udp pcb locally, to the interface which |
| donatien | 0:632c9925f013 | 707 | is used to route output packets to the remote address. However, we |
| donatien | 0:632c9925f013 | 708 | might want to accept incoming packets on any interface! */ |
| donatien | 0:632c9925f013 | 709 | pcb->local_ip = netif->ip_addr; |
| donatien | 0:632c9925f013 | 710 | } else if (ip_addr_isany(&pcb->remote_ip)) { |
| donatien | 0:632c9925f013 | 711 | pcb->local_ip.addr = 0; |
| donatien | 0:632c9925f013 | 712 | } |
| donatien | 0:632c9925f013 | 713 | #endif |
| donatien | 0:632c9925f013 | 714 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:632c9925f013 | 715 | ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n", |
| donatien | 0:632c9925f013 | 716 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip), |
| donatien | 0:632c9925f013 | 717 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), |
| donatien | 0:632c9925f013 | 718 | pcb->local_port)); |
| donatien | 0:632c9925f013 | 719 | |
| donatien | 0:632c9925f013 | 720 | /* Insert UDP PCB into the list of active UDP PCBs. */ |
| donatien | 0:632c9925f013 | 721 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) { |
| donatien | 0:632c9925f013 | 722 | if (pcb == ipcb) { |
| donatien | 0:632c9925f013 | 723 | /* already on the list, just return */ |
| donatien | 0:632c9925f013 | 724 | return ERR_OK; |
| donatien | 0:632c9925f013 | 725 | } |
| donatien | 0:632c9925f013 | 726 | } |
| donatien | 0:632c9925f013 | 727 | /* PCB not yet on the list, add PCB now */ |
| donatien | 0:632c9925f013 | 728 | pcb->next = udp_pcbs; |
| donatien | 0:632c9925f013 | 729 | udp_pcbs = pcb; |
| donatien | 0:632c9925f013 | 730 | return ERR_OK; |
| donatien | 0:632c9925f013 | 731 | } |
| donatien | 0:632c9925f013 | 732 | |
| donatien | 0:632c9925f013 | 733 | /** |
| donatien | 0:632c9925f013 | 734 | * Disconnect a UDP PCB |
| donatien | 0:632c9925f013 | 735 | * |
| donatien | 0:632c9925f013 | 736 | * @param pcb the udp pcb to disconnect. |
| donatien | 0:632c9925f013 | 737 | */ |
| donatien | 0:632c9925f013 | 738 | void |
| donatien | 0:632c9925f013 | 739 | udp_disconnect(struct udp_pcb *pcb) |
| donatien | 0:632c9925f013 | 740 | { |
| donatien | 0:632c9925f013 | 741 | /* reset remote address association */ |
| donatien | 0:632c9925f013 | 742 | ip_addr_set_any(&pcb->remote_ip); |
| donatien | 0:632c9925f013 | 743 | pcb->remote_port = 0; |
| donatien | 0:632c9925f013 | 744 | /* mark PCB as unconnected */ |
| donatien | 0:632c9925f013 | 745 | pcb->flags &= ~UDP_FLAGS_CONNECTED; |
| donatien | 0:632c9925f013 | 746 | } |
| donatien | 0:632c9925f013 | 747 | |
| donatien | 0:632c9925f013 | 748 | /** |
| donatien | 0:632c9925f013 | 749 | * Set a receive callback for a UDP PCB |
| donatien | 0:632c9925f013 | 750 | * |
| donatien | 0:632c9925f013 | 751 | * This callback will be called when receiving a datagram for the pcb. |
| donatien | 0:632c9925f013 | 752 | * |
| donatien | 0:632c9925f013 | 753 | * @param pcb the pcb for wich to set the recv callback |
| donatien | 0:632c9925f013 | 754 | * @param recv function pointer of the callback function |
| donatien | 0:632c9925f013 | 755 | * @param recv_arg additional argument to pass to the callback function |
| donatien | 0:632c9925f013 | 756 | */ |
| donatien | 0:632c9925f013 | 757 | void |
| donatien | 0:632c9925f013 | 758 | udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg) |
| donatien | 0:632c9925f013 | 759 | { |
| donatien | 0:632c9925f013 | 760 | /* remember recv() callback and user data */ |
| donatien | 0:632c9925f013 | 761 | pcb->recv = recv; |
| donatien | 0:632c9925f013 | 762 | pcb->recv_arg = recv_arg; |
| donatien | 0:632c9925f013 | 763 | } |
| donatien | 0:632c9925f013 | 764 | |
| donatien | 0:632c9925f013 | 765 | /** |
| donatien | 0:632c9925f013 | 766 | * Remove an UDP PCB. |
| donatien | 0:632c9925f013 | 767 | * |
| donatien | 0:632c9925f013 | 768 | * @param pcb UDP PCB to be removed. The PCB is removed from the list of |
| donatien | 0:632c9925f013 | 769 | * UDP PCB's and the data structure is freed from memory. |
| donatien | 0:632c9925f013 | 770 | * |
| donatien | 0:632c9925f013 | 771 | * @see udp_new() |
| donatien | 0:632c9925f013 | 772 | */ |
| donatien | 0:632c9925f013 | 773 | void |
| donatien | 0:632c9925f013 | 774 | udp_remove(struct udp_pcb *pcb) |
| donatien | 0:632c9925f013 | 775 | { |
| donatien | 0:632c9925f013 | 776 | struct udp_pcb *pcb2; |
| donatien | 0:632c9925f013 | 777 | |
| donatien | 0:632c9925f013 | 778 | snmp_delete_udpidx_tree(pcb); |
| donatien | 0:632c9925f013 | 779 | /* pcb to be removed is first in list? */ |
| donatien | 0:632c9925f013 | 780 | if (udp_pcbs == pcb) { |
| donatien | 0:632c9925f013 | 781 | /* make list start at 2nd pcb */ |
| donatien | 0:632c9925f013 | 782 | udp_pcbs = udp_pcbs->next; |
| donatien | 0:632c9925f013 | 783 | /* pcb not 1st in list */ |
| donatien | 0:632c9925f013 | 784 | } else { |
| donatien | 0:632c9925f013 | 785 | for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) { |
| donatien | 0:632c9925f013 | 786 | /* find pcb in udp_pcbs list */ |
| donatien | 0:632c9925f013 | 787 | if (pcb2->next != NULL && pcb2->next == pcb) { |
| donatien | 0:632c9925f013 | 788 | /* remove pcb from list */ |
| donatien | 0:632c9925f013 | 789 | pcb2->next = pcb->next; |
| donatien | 0:632c9925f013 | 790 | } |
| donatien | 0:632c9925f013 | 791 | } |
| donatien | 0:632c9925f013 | 792 | } |
| donatien | 0:632c9925f013 | 793 | memp_free(MEMP_UDP_PCB, pcb); |
| donatien | 0:632c9925f013 | 794 | } |
| donatien | 0:632c9925f013 | 795 | |
| donatien | 0:632c9925f013 | 796 | /** |
| donatien | 0:632c9925f013 | 797 | * Create a UDP PCB. |
| donatien | 0:632c9925f013 | 798 | * |
| donatien | 0:632c9925f013 | 799 | * @return The UDP PCB which was created. NULL if the PCB data structure |
| donatien | 0:632c9925f013 | 800 | * could not be allocated. |
| donatien | 0:632c9925f013 | 801 | * |
| donatien | 0:632c9925f013 | 802 | * @see udp_remove() |
| donatien | 0:632c9925f013 | 803 | */ |
| donatien | 0:632c9925f013 | 804 | struct udp_pcb * |
| donatien | 0:632c9925f013 | 805 | udp_new(void) |
| donatien | 0:632c9925f013 | 806 | { |
| donatien | 0:632c9925f013 | 807 | struct udp_pcb *pcb; |
| donatien | 0:632c9925f013 | 808 | pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB); |
| donatien | 0:632c9925f013 | 809 | /* could allocate UDP PCB? */ |
| donatien | 0:632c9925f013 | 810 | if (pcb != NULL) { |
| donatien | 0:632c9925f013 | 811 | /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0 |
| donatien | 0:632c9925f013 | 812 | * which means checksum is generated over the whole datagram per default |
| donatien | 0:632c9925f013 | 813 | * (recommended as default by RFC 3828). */ |
| donatien | 0:632c9925f013 | 814 | /* initialize PCB to all zeroes */ |
| donatien | 0:632c9925f013 | 815 | memset(pcb, 0, sizeof(struct udp_pcb)); |
| donatien | 0:632c9925f013 | 816 | pcb->ttl = UDP_TTL; |
| donatien | 0:632c9925f013 | 817 | } |
| donatien | 0:632c9925f013 | 818 | return pcb; |
| donatien | 0:632c9925f013 | 819 | } |
| donatien | 0:632c9925f013 | 820 | |
| donatien | 0:632c9925f013 | 821 | #if UDP_DEBUG |
| donatien | 0:632c9925f013 | 822 | /** |
| donatien | 0:632c9925f013 | 823 | * Print UDP header information for debug purposes. |
| donatien | 0:632c9925f013 | 824 | * |
| donatien | 0:632c9925f013 | 825 | * @param udphdr pointer to the udp header in memory. |
| donatien | 0:632c9925f013 | 826 | */ |
| donatien | 0:632c9925f013 | 827 | void |
| donatien | 0:632c9925f013 | 828 | udp_debug_print(struct udp_hdr *udphdr) |
| donatien | 0:632c9925f013 | 829 | { |
| donatien | 0:632c9925f013 | 830 | LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n")); |
| donatien | 0:632c9925f013 | 831 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| donatien | 0:632c9925f013 | 832 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n", |
| donatien | 0:632c9925f013 | 833 | ntohs(udphdr->src), ntohs(udphdr->dest))); |
| donatien | 0:632c9925f013 | 834 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| donatien | 0:632c9925f013 | 835 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n", |
| donatien | 0:632c9925f013 | 836 | ntohs(udphdr->len), ntohs(udphdr->chksum))); |
| donatien | 0:632c9925f013 | 837 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
| donatien | 0:632c9925f013 | 838 | } |
| donatien | 0:632c9925f013 | 839 | #endif /* UDP_DEBUG */ |
| donatien | 0:632c9925f013 | 840 | |
| donatien | 0:632c9925f013 | 841 | #endif /* LWIP_UDP */ |