My fork of the HTTPServer (working)
Core/lwIP/core/udp.c@1:284f2df30cf9, 2012-11-20 (annotated)
- Committer:
- screamer
- Date:
- Tue Nov 20 12:18:53 2012 +0000
- Revision:
- 1:284f2df30cf9
- Parent:
- 0:7a64fbb4069d
local changes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
screamer | 0:7a64fbb4069d | 1 | /** |
screamer | 0:7a64fbb4069d | 2 | * @file |
screamer | 0:7a64fbb4069d | 3 | * User Datagram Protocol module |
screamer | 0:7a64fbb4069d | 4 | * |
screamer | 0:7a64fbb4069d | 5 | */ |
screamer | 0:7a64fbb4069d | 6 | |
screamer | 0:7a64fbb4069d | 7 | /* |
screamer | 0:7a64fbb4069d | 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
screamer | 0:7a64fbb4069d | 9 | * All rights reserved. |
screamer | 0:7a64fbb4069d | 10 | * |
screamer | 0:7a64fbb4069d | 11 | * Redistribution and use in source and binary forms, with or without modification, |
screamer | 0:7a64fbb4069d | 12 | * are permitted provided that the following conditions are met: |
screamer | 0:7a64fbb4069d | 13 | * |
screamer | 0:7a64fbb4069d | 14 | * 1. Redistributions of source code must retain the above copyright notice, |
screamer | 0:7a64fbb4069d | 15 | * this list of conditions and the following disclaimer. |
screamer | 0:7a64fbb4069d | 16 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
screamer | 0:7a64fbb4069d | 17 | * this list of conditions and the following disclaimer in the documentation |
screamer | 0:7a64fbb4069d | 18 | * and/or other materials provided with the distribution. |
screamer | 0:7a64fbb4069d | 19 | * 3. The name of the author may not be used to endorse or promote products |
screamer | 0:7a64fbb4069d | 20 | * derived from this software without specific prior written permission. |
screamer | 0:7a64fbb4069d | 21 | * |
screamer | 0:7a64fbb4069d | 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
screamer | 0:7a64fbb4069d | 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
screamer | 0:7a64fbb4069d | 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
screamer | 0:7a64fbb4069d | 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
screamer | 0:7a64fbb4069d | 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
screamer | 0:7a64fbb4069d | 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
screamer | 0:7a64fbb4069d | 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
screamer | 0:7a64fbb4069d | 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
screamer | 0:7a64fbb4069d | 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
screamer | 0:7a64fbb4069d | 31 | * OF SUCH DAMAGE. |
screamer | 0:7a64fbb4069d | 32 | * |
screamer | 0:7a64fbb4069d | 33 | * This file is part of the lwIP TCP/IP stack. |
screamer | 0:7a64fbb4069d | 34 | * |
screamer | 0:7a64fbb4069d | 35 | * Author: Adam Dunkels <adam@sics.se> |
screamer | 0:7a64fbb4069d | 36 | * |
screamer | 0:7a64fbb4069d | 37 | */ |
screamer | 0:7a64fbb4069d | 38 | |
screamer | 0:7a64fbb4069d | 39 | |
screamer | 0:7a64fbb4069d | 40 | /* udp.c |
screamer | 0:7a64fbb4069d | 41 | * |
screamer | 0:7a64fbb4069d | 42 | * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828). |
screamer | 0:7a64fbb4069d | 43 | * |
screamer | 0:7a64fbb4069d | 44 | */ |
screamer | 0:7a64fbb4069d | 45 | |
screamer | 0:7a64fbb4069d | 46 | /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'! |
screamer | 0:7a64fbb4069d | 47 | */ |
screamer | 0:7a64fbb4069d | 48 | |
screamer | 0:7a64fbb4069d | 49 | #include "lwip/opt.h" |
screamer | 0:7a64fbb4069d | 50 | |
screamer | 0:7a64fbb4069d | 51 | #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */ |
screamer | 0:7a64fbb4069d | 52 | |
screamer | 0:7a64fbb4069d | 53 | #include "lwip/udp.h" |
screamer | 0:7a64fbb4069d | 54 | #include "lwip/def.h" |
screamer | 0:7a64fbb4069d | 55 | #include "lwip/memp.h" |
screamer | 0:7a64fbb4069d | 56 | #include "lwip/inet.h" |
screamer | 0:7a64fbb4069d | 57 | #include "lwip/inet_chksum.h" |
screamer | 0:7a64fbb4069d | 58 | #include "lwip/ip_addr.h" |
screamer | 0:7a64fbb4069d | 59 | #include "lwip/netif.h" |
screamer | 0:7a64fbb4069d | 60 | #include "lwip/icmp.h" |
screamer | 0:7a64fbb4069d | 61 | #include "lwip/stats.h" |
screamer | 0:7a64fbb4069d | 62 | #include "lwip/snmp.h" |
screamer | 0:7a64fbb4069d | 63 | #include "arch/perf.h" |
screamer | 0:7a64fbb4069d | 64 | #include "lwip/dhcp.h" |
screamer | 0:7a64fbb4069d | 65 | |
screamer | 0:7a64fbb4069d | 66 | #include <string.h> |
screamer | 0:7a64fbb4069d | 67 | |
screamer | 0:7a64fbb4069d | 68 | /* The list of UDP PCBs */ |
screamer | 0:7a64fbb4069d | 69 | /* exported in udp.h (was static) */ |
screamer | 0:7a64fbb4069d | 70 | struct udp_pcb *udp_pcbs; |
screamer | 0:7a64fbb4069d | 71 | |
screamer | 0:7a64fbb4069d | 72 | /** |
screamer | 0:7a64fbb4069d | 73 | * Process an incoming UDP datagram. |
screamer | 0:7a64fbb4069d | 74 | * |
screamer | 0:7a64fbb4069d | 75 | * Given an incoming UDP datagram (as a chain of pbufs) this function |
screamer | 0:7a64fbb4069d | 76 | * finds a corresponding UDP PCB and hands over the pbuf to the pcbs |
screamer | 0:7a64fbb4069d | 77 | * recv function. If no pcb is found or the datagram is incorrect, the |
screamer | 0:7a64fbb4069d | 78 | * pbuf is freed. |
screamer | 0:7a64fbb4069d | 79 | * |
screamer | 0:7a64fbb4069d | 80 | * @param p pbuf to be demultiplexed to a UDP PCB. |
screamer | 0:7a64fbb4069d | 81 | * @param inp network interface on which the datagram was received. |
screamer | 0:7a64fbb4069d | 82 | * |
screamer | 0:7a64fbb4069d | 83 | */ |
screamer | 0:7a64fbb4069d | 84 | void |
screamer | 0:7a64fbb4069d | 85 | udp_input(struct pbuf *p, struct netif *inp) |
screamer | 0:7a64fbb4069d | 86 | { |
screamer | 0:7a64fbb4069d | 87 | struct udp_hdr *udphdr; |
screamer | 0:7a64fbb4069d | 88 | struct udp_pcb *pcb, *prev; |
screamer | 0:7a64fbb4069d | 89 | struct udp_pcb *uncon_pcb; |
screamer | 0:7a64fbb4069d | 90 | struct ip_hdr *iphdr; |
screamer | 0:7a64fbb4069d | 91 | u16_t src, dest; |
screamer | 0:7a64fbb4069d | 92 | u8_t local_match; |
screamer | 0:7a64fbb4069d | 93 | |
screamer | 0:7a64fbb4069d | 94 | PERF_START; |
screamer | 0:7a64fbb4069d | 95 | |
screamer | 0:7a64fbb4069d | 96 | UDP_STATS_INC(udp.recv); |
screamer | 0:7a64fbb4069d | 97 | |
screamer | 0:7a64fbb4069d | 98 | iphdr = (struct ip_hdr *)(p->payload); |
screamer | 0:7a64fbb4069d | 99 | |
screamer | 0:7a64fbb4069d | 100 | /* Check minimum length (IP header + UDP header) |
screamer | 0:7a64fbb4069d | 101 | * and move payload pointer to UDP header */ |
screamer | 0:7a64fbb4069d | 102 | if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) { |
screamer | 0:7a64fbb4069d | 103 | /* drop short packets */ |
screamer | 0:7a64fbb4069d | 104 | LWIP_DEBUGF(UDP_DEBUG, |
screamer | 0:7a64fbb4069d | 105 | ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len)); |
screamer | 0:7a64fbb4069d | 106 | UDP_STATS_INC(udp.lenerr); |
screamer | 0:7a64fbb4069d | 107 | UDP_STATS_INC(udp.drop); |
screamer | 0:7a64fbb4069d | 108 | snmp_inc_udpinerrors(); |
screamer | 0:7a64fbb4069d | 109 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 110 | goto end; |
screamer | 0:7a64fbb4069d | 111 | } |
screamer | 0:7a64fbb4069d | 112 | |
screamer | 0:7a64fbb4069d | 113 | udphdr = (struct udp_hdr *)p->payload; |
screamer | 0:7a64fbb4069d | 114 | |
screamer | 0:7a64fbb4069d | 115 | LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len)); |
screamer | 0:7a64fbb4069d | 116 | |
screamer | 0:7a64fbb4069d | 117 | /* convert src and dest ports to host byte order */ |
screamer | 0:7a64fbb4069d | 118 | src = ntohs(udphdr->src); |
screamer | 0:7a64fbb4069d | 119 | dest = ntohs(udphdr->dest); |
screamer | 0:7a64fbb4069d | 120 | |
screamer | 0:7a64fbb4069d | 121 | udp_debug_print(udphdr); |
screamer | 0:7a64fbb4069d | 122 | |
screamer | 0:7a64fbb4069d | 123 | /* print the UDP source and destination */ |
screamer | 0:7a64fbb4069d | 124 | LWIP_DEBUGF(UDP_DEBUG, |
screamer | 0:7a64fbb4069d | 125 | ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- " |
screamer | 0:7a64fbb4069d | 126 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n", |
screamer | 0:7a64fbb4069d | 127 | ip4_addr1(&iphdr->dest), ip4_addr2(&iphdr->dest), |
screamer | 0:7a64fbb4069d | 128 | ip4_addr3(&iphdr->dest), ip4_addr4(&iphdr->dest), ntohs(udphdr->dest), |
screamer | 0:7a64fbb4069d | 129 | ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src), |
screamer | 0:7a64fbb4069d | 130 | ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src), ntohs(udphdr->src))); |
screamer | 0:7a64fbb4069d | 131 | |
screamer | 0:7a64fbb4069d | 132 | #if LWIP_DHCP |
screamer | 0:7a64fbb4069d | 133 | pcb = NULL; |
screamer | 0:7a64fbb4069d | 134 | /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by |
screamer | 0:7a64fbb4069d | 135 | the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */ |
screamer | 0:7a64fbb4069d | 136 | if (dest == DHCP_CLIENT_PORT) { |
screamer | 0:7a64fbb4069d | 137 | /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */ |
screamer | 0:7a64fbb4069d | 138 | if (src == DHCP_SERVER_PORT) { |
screamer | 0:7a64fbb4069d | 139 | if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) { |
screamer | 0:7a64fbb4069d | 140 | /* accept the packe if |
screamer | 0:7a64fbb4069d | 141 | (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY! |
screamer | 0:7a64fbb4069d | 142 | - inp->dhcp->pcb->remote == ANY or iphdr->src */ |
screamer | 0:7a64fbb4069d | 143 | if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) || |
screamer | 0:7a64fbb4069d | 144 | ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &(iphdr->src)))) { |
screamer | 0:7a64fbb4069d | 145 | pcb = inp->dhcp->pcb; |
screamer | 0:7a64fbb4069d | 146 | } |
screamer | 0:7a64fbb4069d | 147 | } |
screamer | 0:7a64fbb4069d | 148 | } |
screamer | 0:7a64fbb4069d | 149 | } else |
screamer | 0:7a64fbb4069d | 150 | #endif /* LWIP_DHCP */ |
screamer | 0:7a64fbb4069d | 151 | { |
screamer | 0:7a64fbb4069d | 152 | prev = NULL; |
screamer | 0:7a64fbb4069d | 153 | local_match = 0; |
screamer | 0:7a64fbb4069d | 154 | uncon_pcb = NULL; |
screamer | 0:7a64fbb4069d | 155 | /* Iterate through the UDP pcb list for a matching pcb. |
screamer | 0:7a64fbb4069d | 156 | * 'Perfect match' pcbs (connected to the remote port & ip address) are |
screamer | 0:7a64fbb4069d | 157 | * preferred. If no perfect match is found, the first unconnected pcb that |
screamer | 0:7a64fbb4069d | 158 | * matches the local port and ip address gets the datagram. */ |
screamer | 0:7a64fbb4069d | 159 | for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) { |
screamer | 0:7a64fbb4069d | 160 | local_match = 0; |
screamer | 0:7a64fbb4069d | 161 | /* print the PCB local and remote address */ |
screamer | 0:7a64fbb4069d | 162 | LWIP_DEBUGF(UDP_DEBUG, |
screamer | 0:7a64fbb4069d | 163 | ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- " |
screamer | 0:7a64fbb4069d | 164 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n", |
screamer | 0:7a64fbb4069d | 165 | ip4_addr1(&pcb->local_ip), ip4_addr2(&pcb->local_ip), |
screamer | 0:7a64fbb4069d | 166 | ip4_addr3(&pcb->local_ip), ip4_addr4(&pcb->local_ip), pcb->local_port, |
screamer | 0:7a64fbb4069d | 167 | ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip), |
screamer | 0:7a64fbb4069d | 168 | ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port)); |
screamer | 0:7a64fbb4069d | 169 | |
screamer | 0:7a64fbb4069d | 170 | /* compare PCB local addr+port to UDP destination addr+port */ |
screamer | 0:7a64fbb4069d | 171 | if ((pcb->local_port == dest) && |
screamer | 0:7a64fbb4069d | 172 | (ip_addr_isany(&pcb->local_ip) || |
screamer | 0:7a64fbb4069d | 173 | ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)) || |
screamer | 0:7a64fbb4069d | 174 | #if LWIP_IGMP |
screamer | 0:7a64fbb4069d | 175 | ip_addr_ismulticast(&(iphdr->dest)) || |
screamer | 0:7a64fbb4069d | 176 | #endif /* LWIP_IGMP */ |
screamer | 0:7a64fbb4069d | 177 | ip_addr_isbroadcast(&(iphdr->dest), inp))) { |
screamer | 0:7a64fbb4069d | 178 | local_match = 1; |
screamer | 0:7a64fbb4069d | 179 | if ((uncon_pcb == NULL) && |
screamer | 0:7a64fbb4069d | 180 | ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) { |
screamer | 0:7a64fbb4069d | 181 | /* the first unconnected matching PCB */ |
screamer | 0:7a64fbb4069d | 182 | uncon_pcb = pcb; |
screamer | 0:7a64fbb4069d | 183 | } |
screamer | 0:7a64fbb4069d | 184 | } |
screamer | 0:7a64fbb4069d | 185 | /* compare PCB remote addr+port to UDP source addr+port */ |
screamer | 0:7a64fbb4069d | 186 | if ((local_match != 0) && |
screamer | 0:7a64fbb4069d | 187 | (pcb->remote_port == src) && |
screamer | 0:7a64fbb4069d | 188 | (ip_addr_isany(&pcb->remote_ip) || |
screamer | 0:7a64fbb4069d | 189 | ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) { |
screamer | 0:7a64fbb4069d | 190 | /* the first fully matching PCB */ |
screamer | 0:7a64fbb4069d | 191 | if (prev != NULL) { |
screamer | 0:7a64fbb4069d | 192 | /* move the pcb to the front of udp_pcbs so that is |
screamer | 0:7a64fbb4069d | 193 | found faster next time */ |
screamer | 0:7a64fbb4069d | 194 | prev->next = pcb->next; |
screamer | 0:7a64fbb4069d | 195 | pcb->next = udp_pcbs; |
screamer | 0:7a64fbb4069d | 196 | udp_pcbs = pcb; |
screamer | 0:7a64fbb4069d | 197 | } else { |
screamer | 0:7a64fbb4069d | 198 | UDP_STATS_INC(udp.cachehit); |
screamer | 0:7a64fbb4069d | 199 | } |
screamer | 0:7a64fbb4069d | 200 | break; |
screamer | 0:7a64fbb4069d | 201 | } |
screamer | 0:7a64fbb4069d | 202 | prev = pcb; |
screamer | 0:7a64fbb4069d | 203 | } |
screamer | 0:7a64fbb4069d | 204 | /* no fully matching pcb found? then look for an unconnected pcb */ |
screamer | 0:7a64fbb4069d | 205 | if (pcb == NULL) { |
screamer | 0:7a64fbb4069d | 206 | pcb = uncon_pcb; |
screamer | 0:7a64fbb4069d | 207 | } |
screamer | 0:7a64fbb4069d | 208 | } |
screamer | 0:7a64fbb4069d | 209 | |
screamer | 0:7a64fbb4069d | 210 | /* Check checksum if this is a match or if it was directed at us. */ |
screamer | 0:7a64fbb4069d | 211 | if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &iphdr->dest)) { |
screamer | 0:7a64fbb4069d | 212 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n")); |
screamer | 0:7a64fbb4069d | 213 | #if LWIP_UDPLITE |
screamer | 0:7a64fbb4069d | 214 | if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) { |
screamer | 0:7a64fbb4069d | 215 | /* Do the UDP Lite checksum */ |
screamer | 0:7a64fbb4069d | 216 | #if CHECKSUM_CHECK_UDP |
screamer | 0:7a64fbb4069d | 217 | u16_t chklen = ntohs(udphdr->len); |
screamer | 0:7a64fbb4069d | 218 | if (chklen < sizeof(struct udp_hdr)) { |
screamer | 0:7a64fbb4069d | 219 | if (chklen == 0) { |
screamer | 0:7a64fbb4069d | 220 | /* For UDP-Lite, checksum length of 0 means checksum |
screamer | 0:7a64fbb4069d | 221 | over the complete packet (See RFC 3828 chap. 3.1) */ |
screamer | 0:7a64fbb4069d | 222 | chklen = p->tot_len; |
screamer | 0:7a64fbb4069d | 223 | } else { |
screamer | 0:7a64fbb4069d | 224 | /* At least the UDP-Lite header must be covered by the |
screamer | 0:7a64fbb4069d | 225 | checksum! (Again, see RFC 3828 chap. 3.1) */ |
screamer | 0:7a64fbb4069d | 226 | UDP_STATS_INC(udp.chkerr); |
screamer | 0:7a64fbb4069d | 227 | UDP_STATS_INC(udp.drop); |
screamer | 0:7a64fbb4069d | 228 | snmp_inc_udpinerrors(); |
screamer | 0:7a64fbb4069d | 229 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 230 | goto end; |
screamer | 0:7a64fbb4069d | 231 | } |
screamer | 0:7a64fbb4069d | 232 | } |
screamer | 0:7a64fbb4069d | 233 | if (inet_chksum_pseudo_partial(p, (struct ip_addr *)&(iphdr->src), |
screamer | 0:7a64fbb4069d | 234 | (struct ip_addr *)&(iphdr->dest), |
screamer | 0:7a64fbb4069d | 235 | IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) { |
screamer | 0:7a64fbb4069d | 236 | LWIP_DEBUGF(UDP_DEBUG | 2, |
screamer | 0:7a64fbb4069d | 237 | ("udp_input: UDP Lite datagram discarded due to failing checksum\n")); |
screamer | 0:7a64fbb4069d | 238 | UDP_STATS_INC(udp.chkerr); |
screamer | 0:7a64fbb4069d | 239 | UDP_STATS_INC(udp.drop); |
screamer | 0:7a64fbb4069d | 240 | snmp_inc_udpinerrors(); |
screamer | 0:7a64fbb4069d | 241 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 242 | goto end; |
screamer | 0:7a64fbb4069d | 243 | } |
screamer | 0:7a64fbb4069d | 244 | #endif /* CHECKSUM_CHECK_UDP */ |
screamer | 0:7a64fbb4069d | 245 | } else |
screamer | 0:7a64fbb4069d | 246 | #endif /* LWIP_UDPLITE */ |
screamer | 0:7a64fbb4069d | 247 | { |
screamer | 0:7a64fbb4069d | 248 | #if CHECKSUM_CHECK_UDP |
screamer | 0:7a64fbb4069d | 249 | if (udphdr->chksum != 0) { |
screamer | 0:7a64fbb4069d | 250 | if (inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src), |
screamer | 0:7a64fbb4069d | 251 | (struct ip_addr *)&(iphdr->dest), |
screamer | 0:7a64fbb4069d | 252 | IP_PROTO_UDP, p->tot_len) != 0) { |
screamer | 0:7a64fbb4069d | 253 | LWIP_DEBUGF(UDP_DEBUG | 2, |
screamer | 0:7a64fbb4069d | 254 | ("udp_input: UDP datagram discarded due to failing checksum\n")); |
screamer | 0:7a64fbb4069d | 255 | UDP_STATS_INC(udp.chkerr); |
screamer | 0:7a64fbb4069d | 256 | UDP_STATS_INC(udp.drop); |
screamer | 0:7a64fbb4069d | 257 | snmp_inc_udpinerrors(); |
screamer | 0:7a64fbb4069d | 258 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 259 | goto end; |
screamer | 0:7a64fbb4069d | 260 | } |
screamer | 0:7a64fbb4069d | 261 | } |
screamer | 0:7a64fbb4069d | 262 | #endif /* CHECKSUM_CHECK_UDP */ |
screamer | 0:7a64fbb4069d | 263 | } |
screamer | 0:7a64fbb4069d | 264 | if(pbuf_header(p, -UDP_HLEN)) { |
screamer | 0:7a64fbb4069d | 265 | /* Can we cope with this failing? Just assert for now */ |
screamer | 0:7a64fbb4069d | 266 | LWIP_ASSERT("pbuf_header failed\n", 0); |
screamer | 0:7a64fbb4069d | 267 | UDP_STATS_INC(udp.drop); |
screamer | 0:7a64fbb4069d | 268 | snmp_inc_udpinerrors(); |
screamer | 0:7a64fbb4069d | 269 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 270 | goto end; |
screamer | 0:7a64fbb4069d | 271 | } |
screamer | 0:7a64fbb4069d | 272 | if (pcb != NULL) { |
screamer | 0:7a64fbb4069d | 273 | snmp_inc_udpindatagrams(); |
screamer | 0:7a64fbb4069d | 274 | /* callback */ |
screamer | 0:7a64fbb4069d | 275 | if (pcb->recv != NULL) { |
screamer | 0:7a64fbb4069d | 276 | /* now the recv function is responsible for freeing p */ |
screamer | 0:7a64fbb4069d | 277 | struct ip_addr iphdrsrc; // __packed hack |
screamer | 0:7a64fbb4069d | 278 | iphdrsrc.addr = iphdr->src.addr; |
screamer | 0:7a64fbb4069d | 279 | pcb->recv(pcb->recv_arg, pcb, p, &iphdrsrc, src); |
screamer | 0:7a64fbb4069d | 280 | } else { |
screamer | 0:7a64fbb4069d | 281 | /* no recv function registered? then we have to free the pbuf! */ |
screamer | 0:7a64fbb4069d | 282 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 283 | goto end; |
screamer | 0:7a64fbb4069d | 284 | } |
screamer | 0:7a64fbb4069d | 285 | } else { |
screamer | 0:7a64fbb4069d | 286 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n")); |
screamer | 0:7a64fbb4069d | 287 | |
screamer | 0:7a64fbb4069d | 288 | #if LWIP_ICMP |
screamer | 0:7a64fbb4069d | 289 | /* No match was found, send ICMP destination port unreachable unless |
screamer | 0:7a64fbb4069d | 290 | destination address was broadcast/multicast. */ |
screamer | 0:7a64fbb4069d | 291 | if (!ip_addr_isbroadcast(&(iphdr->dest), inp) && |
screamer | 0:7a64fbb4069d | 292 | !ip_addr_ismulticast(&iphdr->dest)) { |
screamer | 0:7a64fbb4069d | 293 | /* move payload pointer back to ip header */ |
screamer | 0:7a64fbb4069d | 294 | pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN); |
screamer | 0:7a64fbb4069d | 295 | LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr)); |
screamer | 0:7a64fbb4069d | 296 | icmp_dest_unreach(p, ICMP_DUR_PORT); |
screamer | 0:7a64fbb4069d | 297 | } |
screamer | 0:7a64fbb4069d | 298 | #endif /* LWIP_ICMP */ |
screamer | 0:7a64fbb4069d | 299 | UDP_STATS_INC(udp.proterr); |
screamer | 0:7a64fbb4069d | 300 | UDP_STATS_INC(udp.drop); |
screamer | 0:7a64fbb4069d | 301 | snmp_inc_udpnoports(); |
screamer | 0:7a64fbb4069d | 302 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 303 | } |
screamer | 0:7a64fbb4069d | 304 | } else { |
screamer | 0:7a64fbb4069d | 305 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 306 | } |
screamer | 0:7a64fbb4069d | 307 | end: |
screamer | 0:7a64fbb4069d | 308 | PERF_STOP("udp_input"); |
screamer | 0:7a64fbb4069d | 309 | } |
screamer | 0:7a64fbb4069d | 310 | |
screamer | 0:7a64fbb4069d | 311 | /** |
screamer | 0:7a64fbb4069d | 312 | * Send data using UDP. |
screamer | 0:7a64fbb4069d | 313 | * |
screamer | 0:7a64fbb4069d | 314 | * @param pcb UDP PCB used to send the data. |
screamer | 0:7a64fbb4069d | 315 | * @param p chain of pbuf's to be sent. |
screamer | 0:7a64fbb4069d | 316 | * |
screamer | 0:7a64fbb4069d | 317 | * The datagram will be sent to the current remote_ip & remote_port |
screamer | 0:7a64fbb4069d | 318 | * stored in pcb. If the pcb is not bound to a port, it will |
screamer | 0:7a64fbb4069d | 319 | * automatically be bound to a random port. |
screamer | 0:7a64fbb4069d | 320 | * |
screamer | 0:7a64fbb4069d | 321 | * @return lwIP error code. |
screamer | 0:7a64fbb4069d | 322 | * - ERR_OK. Successful. No error occured. |
screamer | 0:7a64fbb4069d | 323 | * - ERR_MEM. Out of memory. |
screamer | 0:7a64fbb4069d | 324 | * - ERR_RTE. Could not find route to destination address. |
screamer | 0:7a64fbb4069d | 325 | * - More errors could be returned by lower protocol layers. |
screamer | 0:7a64fbb4069d | 326 | * |
screamer | 0:7a64fbb4069d | 327 | * @see udp_disconnect() udp_sendto() |
screamer | 0:7a64fbb4069d | 328 | */ |
screamer | 0:7a64fbb4069d | 329 | err_t |
screamer | 0:7a64fbb4069d | 330 | udp_send(struct udp_pcb *pcb, struct pbuf *p) |
screamer | 0:7a64fbb4069d | 331 | { |
screamer | 0:7a64fbb4069d | 332 | /* send to the packet using remote ip and port stored in the pcb */ |
screamer | 0:7a64fbb4069d | 333 | return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port); |
screamer | 0:7a64fbb4069d | 334 | } |
screamer | 0:7a64fbb4069d | 335 | |
screamer | 0:7a64fbb4069d | 336 | /** |
screamer | 0:7a64fbb4069d | 337 | * Send data to a specified address using UDP. |
screamer | 0:7a64fbb4069d | 338 | * |
screamer | 0:7a64fbb4069d | 339 | * @param pcb UDP PCB used to send the data. |
screamer | 0:7a64fbb4069d | 340 | * @param p chain of pbuf's to be sent. |
screamer | 0:7a64fbb4069d | 341 | * @param dst_ip Destination IP address. |
screamer | 0:7a64fbb4069d | 342 | * @param dst_port Destination UDP port. |
screamer | 0:7a64fbb4069d | 343 | * |
screamer | 0:7a64fbb4069d | 344 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb. |
screamer | 0:7a64fbb4069d | 345 | * |
screamer | 0:7a64fbb4069d | 346 | * If the PCB already has a remote address association, it will |
screamer | 0:7a64fbb4069d | 347 | * be restored after the data is sent. |
screamer | 0:7a64fbb4069d | 348 | * |
screamer | 0:7a64fbb4069d | 349 | * @return lwIP error code (@see udp_send for possible error codes) |
screamer | 0:7a64fbb4069d | 350 | * |
screamer | 0:7a64fbb4069d | 351 | * @see udp_disconnect() udp_send() |
screamer | 0:7a64fbb4069d | 352 | */ |
screamer | 0:7a64fbb4069d | 353 | err_t |
screamer | 0:7a64fbb4069d | 354 | udp_sendto(struct udp_pcb *pcb, struct pbuf *p, |
screamer | 0:7a64fbb4069d | 355 | struct ip_addr *dst_ip, u16_t dst_port) |
screamer | 0:7a64fbb4069d | 356 | { |
screamer | 0:7a64fbb4069d | 357 | struct netif *netif; |
screamer | 0:7a64fbb4069d | 358 | |
screamer | 0:7a64fbb4069d | 359 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 3, ("udp_send\n")); |
screamer | 0:7a64fbb4069d | 360 | |
screamer | 0:7a64fbb4069d | 361 | /* find the outgoing network interface for this packet */ |
screamer | 0:7a64fbb4069d | 362 | #if LWIP_IGMP |
screamer | 0:7a64fbb4069d | 363 | netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip)); |
screamer | 0:7a64fbb4069d | 364 | #else |
screamer | 0:7a64fbb4069d | 365 | netif = ip_route(dst_ip); |
screamer | 0:7a64fbb4069d | 366 | #endif /* LWIP_IGMP */ |
screamer | 0:7a64fbb4069d | 367 | |
screamer | 0:7a64fbb4069d | 368 | /* no outgoing network interface could be found? */ |
screamer | 0:7a64fbb4069d | 369 | if (netif == NULL) { |
screamer | 0:7a64fbb4069d | 370 | LWIP_DEBUGF(UDP_DEBUG | 1, ("udp_send: No route to 0x%"X32_F"\n", dst_ip->addr)); |
screamer | 0:7a64fbb4069d | 371 | UDP_STATS_INC(udp.rterr); |
screamer | 0:7a64fbb4069d | 372 | return ERR_RTE; |
screamer | 0:7a64fbb4069d | 373 | } |
screamer | 0:7a64fbb4069d | 374 | return udp_sendto_if(pcb, p, dst_ip, dst_port, netif); |
screamer | 0:7a64fbb4069d | 375 | } |
screamer | 0:7a64fbb4069d | 376 | |
screamer | 0:7a64fbb4069d | 377 | /** |
screamer | 0:7a64fbb4069d | 378 | * Send data to a specified address using UDP. |
screamer | 0:7a64fbb4069d | 379 | * The netif used for sending can be specified. |
screamer | 0:7a64fbb4069d | 380 | * |
screamer | 0:7a64fbb4069d | 381 | * This function exists mainly for DHCP, to be able to send UDP packets |
screamer | 0:7a64fbb4069d | 382 | * on a netif that is still down. |
screamer | 0:7a64fbb4069d | 383 | * |
screamer | 0:7a64fbb4069d | 384 | * @param pcb UDP PCB used to send the data. |
screamer | 0:7a64fbb4069d | 385 | * @param p chain of pbuf's to be sent. |
screamer | 0:7a64fbb4069d | 386 | * @param dst_ip Destination IP address. |
screamer | 0:7a64fbb4069d | 387 | * @param dst_port Destination UDP port. |
screamer | 0:7a64fbb4069d | 388 | * @param netif the netif used for sending. |
screamer | 0:7a64fbb4069d | 389 | * |
screamer | 0:7a64fbb4069d | 390 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb. |
screamer | 0:7a64fbb4069d | 391 | * |
screamer | 0:7a64fbb4069d | 392 | * @return lwIP error code (@see udp_send for possible error codes) |
screamer | 0:7a64fbb4069d | 393 | * |
screamer | 0:7a64fbb4069d | 394 | * @see udp_disconnect() udp_send() |
screamer | 0:7a64fbb4069d | 395 | */ |
screamer | 0:7a64fbb4069d | 396 | err_t |
screamer | 0:7a64fbb4069d | 397 | udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p, |
screamer | 0:7a64fbb4069d | 398 | struct ip_addr *dst_ip, u16_t dst_port, struct netif *netif) |
screamer | 0:7a64fbb4069d | 399 | { |
screamer | 0:7a64fbb4069d | 400 | struct udp_hdr *udphdr; |
screamer | 0:7a64fbb4069d | 401 | struct ip_addr *src_ip; |
screamer | 0:7a64fbb4069d | 402 | err_t err; |
screamer | 0:7a64fbb4069d | 403 | struct pbuf *q; /* q will be sent down the stack */ |
screamer | 0:7a64fbb4069d | 404 | |
screamer | 0:7a64fbb4069d | 405 | /* if the PCB is not yet bound to a port, bind it here */ |
screamer | 0:7a64fbb4069d | 406 | if (pcb->local_port == 0) { |
screamer | 0:7a64fbb4069d | 407 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 2, ("udp_send: not yet bound to a port, binding now\n")); |
screamer | 0:7a64fbb4069d | 408 | err = udp_bind(pcb, &pcb->local_ip, pcb->local_port); |
screamer | 0:7a64fbb4069d | 409 | if (err != ERR_OK) { |
screamer | 0:7a64fbb4069d | 410 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 2, ("udp_send: forced port bind failed\n")); |
screamer | 0:7a64fbb4069d | 411 | return err; |
screamer | 0:7a64fbb4069d | 412 | } |
screamer | 0:7a64fbb4069d | 413 | } |
screamer | 0:7a64fbb4069d | 414 | |
screamer | 0:7a64fbb4069d | 415 | /* not enough space to add an UDP header to first pbuf in given p chain? */ |
screamer | 0:7a64fbb4069d | 416 | if (pbuf_header(p, UDP_HLEN)) { |
screamer | 0:7a64fbb4069d | 417 | /* allocate header in a separate new pbuf */ |
screamer | 0:7a64fbb4069d | 418 | q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM); |
screamer | 0:7a64fbb4069d | 419 | /* new header pbuf could not be allocated? */ |
screamer | 0:7a64fbb4069d | 420 | if (q == NULL) { |
screamer | 0:7a64fbb4069d | 421 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 2, ("udp_send: could not allocate header\n")); |
screamer | 0:7a64fbb4069d | 422 | return ERR_MEM; |
screamer | 0:7a64fbb4069d | 423 | } |
screamer | 0:7a64fbb4069d | 424 | /* chain header q in front of given pbuf p */ |
screamer | 0:7a64fbb4069d | 425 | pbuf_chain(q, p); |
screamer | 0:7a64fbb4069d | 426 | /* first pbuf q points to header pbuf */ |
screamer | 0:7a64fbb4069d | 427 | LWIP_DEBUGF(UDP_DEBUG, |
screamer | 0:7a64fbb4069d | 428 | ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p)); |
screamer | 0:7a64fbb4069d | 429 | } else { |
screamer | 0:7a64fbb4069d | 430 | /* adding space for header within p succeeded */ |
screamer | 0:7a64fbb4069d | 431 | /* first pbuf q equals given pbuf */ |
screamer | 0:7a64fbb4069d | 432 | q = p; |
screamer | 0:7a64fbb4069d | 433 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p)); |
screamer | 0:7a64fbb4069d | 434 | } |
screamer | 0:7a64fbb4069d | 435 | LWIP_ASSERT("check that first pbuf can hold struct udp_hdr", |
screamer | 0:7a64fbb4069d | 436 | (q->len >= sizeof(struct udp_hdr))); |
screamer | 0:7a64fbb4069d | 437 | /* q now represents the packet to be sent */ |
screamer | 0:7a64fbb4069d | 438 | udphdr = (struct udp_hdr *)(q->payload); |
screamer | 0:7a64fbb4069d | 439 | udphdr->src = htons(pcb->local_port); |
screamer | 0:7a64fbb4069d | 440 | udphdr->dest = htons(dst_port); |
screamer | 0:7a64fbb4069d | 441 | /* in UDP, 0 checksum means 'no checksum' */ |
screamer | 0:7a64fbb4069d | 442 | udphdr->chksum = 0x0000; |
screamer | 0:7a64fbb4069d | 443 | |
screamer | 0:7a64fbb4069d | 444 | /* PCB local address is IP_ANY_ADDR? */ |
screamer | 0:7a64fbb4069d | 445 | if (ip_addr_isany(&pcb->local_ip)) { |
screamer | 0:7a64fbb4069d | 446 | /* use outgoing network interface IP address as source address */ |
screamer | 0:7a64fbb4069d | 447 | src_ip = &(netif->ip_addr); |
screamer | 0:7a64fbb4069d | 448 | } else { |
screamer | 0:7a64fbb4069d | 449 | /* check if UDP PCB local IP address is correct |
screamer | 0:7a64fbb4069d | 450 | * this could be an old address if netif->ip_addr has changed */ |
screamer | 0:7a64fbb4069d | 451 | if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) { |
screamer | 0:7a64fbb4069d | 452 | /* local_ip doesn't match, drop the packet */ |
screamer | 0:7a64fbb4069d | 453 | if (q != p) { |
screamer | 0:7a64fbb4069d | 454 | /* free the header pbuf */ |
screamer | 0:7a64fbb4069d | 455 | pbuf_free(q); |
screamer | 0:7a64fbb4069d | 456 | q = NULL; |
screamer | 0:7a64fbb4069d | 457 | /* p is still referenced by the caller, and will live on */ |
screamer | 0:7a64fbb4069d | 458 | } |
screamer | 0:7a64fbb4069d | 459 | return ERR_VAL; |
screamer | 0:7a64fbb4069d | 460 | } |
screamer | 0:7a64fbb4069d | 461 | /* use UDP PCB local IP address as source address */ |
screamer | 0:7a64fbb4069d | 462 | src_ip = &(pcb->local_ip); |
screamer | 0:7a64fbb4069d | 463 | } |
screamer | 0:7a64fbb4069d | 464 | |
screamer | 0:7a64fbb4069d | 465 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len)); |
screamer | 0:7a64fbb4069d | 466 | |
screamer | 0:7a64fbb4069d | 467 | #if LWIP_UDPLITE |
screamer | 0:7a64fbb4069d | 468 | /* UDP Lite protocol? */ |
screamer | 0:7a64fbb4069d | 469 | if (pcb->flags & UDP_FLAGS_UDPLITE) { |
screamer | 0:7a64fbb4069d | 470 | u16_t chklen, chklen_hdr; |
screamer | 0:7a64fbb4069d | 471 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len)); |
screamer | 0:7a64fbb4069d | 472 | /* set UDP message length in UDP header */ |
screamer | 0:7a64fbb4069d | 473 | chklen_hdr = chklen = pcb->chksum_len_tx; |
screamer | 0:7a64fbb4069d | 474 | if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) { |
screamer | 0:7a64fbb4069d | 475 | if (chklen != 0) { |
screamer | 0:7a64fbb4069d | 476 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen)); |
screamer | 0:7a64fbb4069d | 477 | } |
screamer | 0:7a64fbb4069d | 478 | /* For UDP-Lite, checksum length of 0 means checksum |
screamer | 0:7a64fbb4069d | 479 | over the complete packet. (See RFC 3828 chap. 3.1) |
screamer | 0:7a64fbb4069d | 480 | At least the UDP-Lite header must be covered by the |
screamer | 0:7a64fbb4069d | 481 | checksum, therefore, if chksum_len has an illegal |
screamer | 0:7a64fbb4069d | 482 | value, we generate the checksum over the complete |
screamer | 0:7a64fbb4069d | 483 | packet to be safe. */ |
screamer | 0:7a64fbb4069d | 484 | chklen_hdr = 0; |
screamer | 0:7a64fbb4069d | 485 | chklen = q->tot_len; |
screamer | 0:7a64fbb4069d | 486 | } |
screamer | 0:7a64fbb4069d | 487 | udphdr->len = htons(chklen_hdr); |
screamer | 0:7a64fbb4069d | 488 | /* calculate checksum */ |
screamer | 0:7a64fbb4069d | 489 | #if CHECKSUM_GEN_UDP |
screamer | 0:7a64fbb4069d | 490 | udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, |
screamer | 0:7a64fbb4069d | 491 | IP_PROTO_UDPLITE, q->tot_len, chklen); |
screamer | 0:7a64fbb4069d | 492 | /* chksum zero must become 0xffff, as zero means 'no checksum' */ |
screamer | 0:7a64fbb4069d | 493 | if (udphdr->chksum == 0x0000) |
screamer | 0:7a64fbb4069d | 494 | udphdr->chksum = 0xffff; |
screamer | 0:7a64fbb4069d | 495 | #endif /* CHECKSUM_CHECK_UDP */ |
screamer | 0:7a64fbb4069d | 496 | /* output to IP */ |
screamer | 0:7a64fbb4069d | 497 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n")); |
screamer | 0:7a64fbb4069d | 498 | #if LWIP_NETIF_HWADDRHINT |
screamer | 0:7a64fbb4069d | 499 | netif->addr_hint = &(pcb->addr_hint); |
screamer | 0:7a64fbb4069d | 500 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
screamer | 0:7a64fbb4069d | 501 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif); |
screamer | 0:7a64fbb4069d | 502 | #if LWIP_NETIF_HWADDRHINT |
screamer | 0:7a64fbb4069d | 503 | netif->addr_hint = NULL; |
screamer | 0:7a64fbb4069d | 504 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
screamer | 0:7a64fbb4069d | 505 | } else |
screamer | 0:7a64fbb4069d | 506 | #endif /* LWIP_UDPLITE */ |
screamer | 0:7a64fbb4069d | 507 | { /* UDP */ |
screamer | 0:7a64fbb4069d | 508 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len)); |
screamer | 0:7a64fbb4069d | 509 | udphdr->len = htons(q->tot_len); |
screamer | 0:7a64fbb4069d | 510 | /* calculate checksum */ |
screamer | 0:7a64fbb4069d | 511 | #if CHECKSUM_GEN_UDP |
screamer | 0:7a64fbb4069d | 512 | if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) { |
screamer | 0:7a64fbb4069d | 513 | udphdr->chksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len); |
screamer | 0:7a64fbb4069d | 514 | /* chksum zero must become 0xffff, as zero means 'no checksum' */ |
screamer | 0:7a64fbb4069d | 515 | if (udphdr->chksum == 0x0000) udphdr->chksum = 0xffff; |
screamer | 0:7a64fbb4069d | 516 | } |
screamer | 0:7a64fbb4069d | 517 | #endif /* CHECKSUM_CHECK_UDP */ |
screamer | 0:7a64fbb4069d | 518 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum)); |
screamer | 0:7a64fbb4069d | 519 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n")); |
screamer | 0:7a64fbb4069d | 520 | /* output to IP */ |
screamer | 0:7a64fbb4069d | 521 | #if LWIP_NETIF_HWADDRHINT |
screamer | 0:7a64fbb4069d | 522 | netif->addr_hint = &(pcb->addr_hint); |
screamer | 0:7a64fbb4069d | 523 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
screamer | 0:7a64fbb4069d | 524 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif); |
screamer | 0:7a64fbb4069d | 525 | #if LWIP_NETIF_HWADDRHINT |
screamer | 0:7a64fbb4069d | 526 | netif->addr_hint = NULL; |
screamer | 0:7a64fbb4069d | 527 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
screamer | 0:7a64fbb4069d | 528 | } |
screamer | 0:7a64fbb4069d | 529 | /* TODO: must this be increased even if error occured? */ |
screamer | 0:7a64fbb4069d | 530 | snmp_inc_udpoutdatagrams(); |
screamer | 0:7a64fbb4069d | 531 | |
screamer | 0:7a64fbb4069d | 532 | /* did we chain a separate header pbuf earlier? */ |
screamer | 0:7a64fbb4069d | 533 | if (q != p) { |
screamer | 0:7a64fbb4069d | 534 | /* free the header pbuf */ |
screamer | 0:7a64fbb4069d | 535 | pbuf_free(q); |
screamer | 0:7a64fbb4069d | 536 | q = NULL; |
screamer | 0:7a64fbb4069d | 537 | /* p is still referenced by the caller, and will live on */ |
screamer | 0:7a64fbb4069d | 538 | } |
screamer | 0:7a64fbb4069d | 539 | |
screamer | 0:7a64fbb4069d | 540 | UDP_STATS_INC(udp.xmit); |
screamer | 0:7a64fbb4069d | 541 | return err; |
screamer | 0:7a64fbb4069d | 542 | } |
screamer | 0:7a64fbb4069d | 543 | |
screamer | 0:7a64fbb4069d | 544 | /** |
screamer | 0:7a64fbb4069d | 545 | * Bind an UDP PCB. |
screamer | 0:7a64fbb4069d | 546 | * |
screamer | 0:7a64fbb4069d | 547 | * @param pcb UDP PCB to be bound with a local address ipaddr and port. |
screamer | 0:7a64fbb4069d | 548 | * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to |
screamer | 0:7a64fbb4069d | 549 | * bind to all local interfaces. |
screamer | 0:7a64fbb4069d | 550 | * @param port local UDP port to bind with. Use 0 to automatically bind |
screamer | 0:7a64fbb4069d | 551 | * to a random port between UDP_LOCAL_PORT_RANGE_START and |
screamer | 0:7a64fbb4069d | 552 | * UDP_LOCAL_PORT_RANGE_END. |
screamer | 0:7a64fbb4069d | 553 | * |
screamer | 0:7a64fbb4069d | 554 | * ipaddr & port are expected to be in the same byte order as in the pcb. |
screamer | 0:7a64fbb4069d | 555 | * |
screamer | 0:7a64fbb4069d | 556 | * @return lwIP error code. |
screamer | 0:7a64fbb4069d | 557 | * - ERR_OK. Successful. No error occured. |
screamer | 0:7a64fbb4069d | 558 | * - ERR_USE. The specified ipaddr and port are already bound to by |
screamer | 0:7a64fbb4069d | 559 | * another UDP PCB. |
screamer | 0:7a64fbb4069d | 560 | * |
screamer | 0:7a64fbb4069d | 561 | * @see udp_disconnect() |
screamer | 0:7a64fbb4069d | 562 | */ |
screamer | 0:7a64fbb4069d | 563 | err_t |
screamer | 0:7a64fbb4069d | 564 | udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port) |
screamer | 0:7a64fbb4069d | 565 | { |
screamer | 0:7a64fbb4069d | 566 | struct udp_pcb *ipcb; |
screamer | 0:7a64fbb4069d | 567 | u8_t rebind; |
screamer | 0:7a64fbb4069d | 568 | |
screamer | 0:7a64fbb4069d | 569 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 3, ("udp_bind(ipaddr = ")); |
screamer | 0:7a64fbb4069d | 570 | ip_addr_debug_print(UDP_DEBUG, ipaddr); |
screamer | 0:7a64fbb4069d | 571 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | 3, (", port = %"U16_F")\n", port)); |
screamer | 0:7a64fbb4069d | 572 | |
screamer | 0:7a64fbb4069d | 573 | rebind = 0; |
screamer | 0:7a64fbb4069d | 574 | /* Check for double bind and rebind of the same pcb */ |
screamer | 0:7a64fbb4069d | 575 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) { |
screamer | 0:7a64fbb4069d | 576 | /* is this UDP PCB already on active list? */ |
screamer | 0:7a64fbb4069d | 577 | if (pcb == ipcb) { |
screamer | 0:7a64fbb4069d | 578 | /* pcb may occur at most once in active list */ |
screamer | 0:7a64fbb4069d | 579 | LWIP_ASSERT("rebind == 0", rebind == 0); |
screamer | 0:7a64fbb4069d | 580 | /* pcb already in list, just rebind */ |
screamer | 0:7a64fbb4069d | 581 | rebind = 1; |
screamer | 0:7a64fbb4069d | 582 | } |
screamer | 0:7a64fbb4069d | 583 | |
screamer | 0:7a64fbb4069d | 584 | /* this code does not allow upper layer to share a UDP port for |
screamer | 0:7a64fbb4069d | 585 | listening to broadcast or multicast traffic (See SO_REUSE_ADDR and |
screamer | 0:7a64fbb4069d | 586 | SO_REUSE_PORT under *BSD). TODO: See where it fits instead, OR |
screamer | 0:7a64fbb4069d | 587 | combine with implementation of UDP PCB flags. Leon Woestenberg. */ |
screamer | 0:7a64fbb4069d | 588 | #ifdef LWIP_UDP_TODO |
screamer | 0:7a64fbb4069d | 589 | /* port matches that of PCB in list? */ |
screamer | 0:7a64fbb4069d | 590 | else |
screamer | 0:7a64fbb4069d | 591 | if ((ipcb->local_port == port) && |
screamer | 0:7a64fbb4069d | 592 | /* IP address matches, or one is IP_ADDR_ANY? */ |
screamer | 0:7a64fbb4069d | 593 | (ip_addr_isany(&(ipcb->local_ip)) || |
screamer | 0:7a64fbb4069d | 594 | ip_addr_isany(ipaddr) || |
screamer | 0:7a64fbb4069d | 595 | ip_addr_cmp(&(ipcb->local_ip), ipaddr))) { |
screamer | 0:7a64fbb4069d | 596 | /* other PCB already binds to this local IP and port */ |
screamer | 0:7a64fbb4069d | 597 | LWIP_DEBUGF(UDP_DEBUG, |
screamer | 0:7a64fbb4069d | 598 | ("udp_bind: local port %"U16_F" already bound by another pcb\n", port)); |
screamer | 0:7a64fbb4069d | 599 | return ERR_USE; |
screamer | 0:7a64fbb4069d | 600 | } |
screamer | 0:7a64fbb4069d | 601 | #endif |
screamer | 0:7a64fbb4069d | 602 | } |
screamer | 0:7a64fbb4069d | 603 | |
screamer | 0:7a64fbb4069d | 604 | ip_addr_set(&pcb->local_ip, ipaddr); |
screamer | 0:7a64fbb4069d | 605 | |
screamer | 0:7a64fbb4069d | 606 | /* no port specified? */ |
screamer | 0:7a64fbb4069d | 607 | if (port == 0) { |
screamer | 0:7a64fbb4069d | 608 | #ifndef UDP_LOCAL_PORT_RANGE_START |
screamer | 0:7a64fbb4069d | 609 | #define UDP_LOCAL_PORT_RANGE_START 4096 |
screamer | 0:7a64fbb4069d | 610 | #define UDP_LOCAL_PORT_RANGE_END 0x7fff |
screamer | 0:7a64fbb4069d | 611 | #endif |
screamer | 0:7a64fbb4069d | 612 | port = UDP_LOCAL_PORT_RANGE_START; |
screamer | 0:7a64fbb4069d | 613 | ipcb = udp_pcbs; |
screamer | 0:7a64fbb4069d | 614 | while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) { |
screamer | 0:7a64fbb4069d | 615 | if (ipcb->local_port == port) { |
screamer | 0:7a64fbb4069d | 616 | /* port is already used by another udp_pcb */ |
screamer | 0:7a64fbb4069d | 617 | port++; |
screamer | 0:7a64fbb4069d | 618 | /* restart scanning all udp pcbs */ |
screamer | 0:7a64fbb4069d | 619 | ipcb = udp_pcbs; |
screamer | 0:7a64fbb4069d | 620 | } else |
screamer | 0:7a64fbb4069d | 621 | /* go on with next udp pcb */ |
screamer | 0:7a64fbb4069d | 622 | ipcb = ipcb->next; |
screamer | 0:7a64fbb4069d | 623 | } |
screamer | 0:7a64fbb4069d | 624 | if (ipcb != NULL) { |
screamer | 0:7a64fbb4069d | 625 | /* no more ports available in local range */ |
screamer | 0:7a64fbb4069d | 626 | LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n")); |
screamer | 0:7a64fbb4069d | 627 | return ERR_USE; |
screamer | 0:7a64fbb4069d | 628 | } |
screamer | 0:7a64fbb4069d | 629 | } |
screamer | 0:7a64fbb4069d | 630 | pcb->local_port = port; |
screamer | 0:7a64fbb4069d | 631 | snmp_insert_udpidx_tree(pcb); |
screamer | 0:7a64fbb4069d | 632 | /* pcb not active yet? */ |
screamer | 0:7a64fbb4069d | 633 | if (rebind == 0) { |
screamer | 0:7a64fbb4069d | 634 | /* place the PCB on the active list if not already there */ |
screamer | 0:7a64fbb4069d | 635 | pcb->next = udp_pcbs; |
screamer | 0:7a64fbb4069d | 636 | udp_pcbs = pcb; |
screamer | 0:7a64fbb4069d | 637 | } |
screamer | 0:7a64fbb4069d | 638 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
screamer | 0:7a64fbb4069d | 639 | ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n", |
screamer | 0:7a64fbb4069d | 640 | (u16_t)((ntohl(pcb->local_ip.addr) >> 24) & 0xff), |
screamer | 0:7a64fbb4069d | 641 | (u16_t)((ntohl(pcb->local_ip.addr) >> 16) & 0xff), |
screamer | 0:7a64fbb4069d | 642 | (u16_t)((ntohl(pcb->local_ip.addr) >> 8) & 0xff), |
screamer | 0:7a64fbb4069d | 643 | (u16_t)(ntohl(pcb->local_ip.addr) & 0xff), pcb->local_port)); |
screamer | 0:7a64fbb4069d | 644 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 645 | } |
screamer | 0:7a64fbb4069d | 646 | /** |
screamer | 0:7a64fbb4069d | 647 | * Connect an UDP PCB. |
screamer | 0:7a64fbb4069d | 648 | * |
screamer | 0:7a64fbb4069d | 649 | * This will associate the UDP PCB with the remote address. |
screamer | 0:7a64fbb4069d | 650 | * |
screamer | 0:7a64fbb4069d | 651 | * @param pcb UDP PCB to be connected with remote address ipaddr and port. |
screamer | 0:7a64fbb4069d | 652 | * @param ipaddr remote IP address to connect with. |
screamer | 0:7a64fbb4069d | 653 | * @param port remote UDP port to connect with. |
screamer | 0:7a64fbb4069d | 654 | * |
screamer | 0:7a64fbb4069d | 655 | * @return lwIP error code |
screamer | 0:7a64fbb4069d | 656 | * |
screamer | 0:7a64fbb4069d | 657 | * ipaddr & port are expected to be in the same byte order as in the pcb. |
screamer | 0:7a64fbb4069d | 658 | * |
screamer | 0:7a64fbb4069d | 659 | * The udp pcb is bound to a random local port if not already bound. |
screamer | 0:7a64fbb4069d | 660 | * |
screamer | 0:7a64fbb4069d | 661 | * @see udp_disconnect() |
screamer | 0:7a64fbb4069d | 662 | */ |
screamer | 0:7a64fbb4069d | 663 | err_t |
screamer | 0:7a64fbb4069d | 664 | udp_connect(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port) |
screamer | 0:7a64fbb4069d | 665 | { |
screamer | 0:7a64fbb4069d | 666 | struct udp_pcb *ipcb; |
screamer | 0:7a64fbb4069d | 667 | |
screamer | 0:7a64fbb4069d | 668 | if (pcb->local_port == 0) { |
screamer | 0:7a64fbb4069d | 669 | err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port); |
screamer | 0:7a64fbb4069d | 670 | if (err != ERR_OK) |
screamer | 0:7a64fbb4069d | 671 | return err; |
screamer | 0:7a64fbb4069d | 672 | } |
screamer | 0:7a64fbb4069d | 673 | |
screamer | 0:7a64fbb4069d | 674 | ip_addr_set(&pcb->remote_ip, ipaddr); |
screamer | 0:7a64fbb4069d | 675 | pcb->remote_port = port; |
screamer | 0:7a64fbb4069d | 676 | pcb->flags |= UDP_FLAGS_CONNECTED; |
screamer | 0:7a64fbb4069d | 677 | /** TODO: this functionality belongs in upper layers */ |
screamer | 0:7a64fbb4069d | 678 | #ifdef LWIP_UDP_TODO |
screamer | 0:7a64fbb4069d | 679 | /* Nail down local IP for netconn_addr()/getsockname() */ |
screamer | 0:7a64fbb4069d | 680 | if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) { |
screamer | 0:7a64fbb4069d | 681 | struct netif *netif; |
screamer | 0:7a64fbb4069d | 682 | |
screamer | 0:7a64fbb4069d | 683 | if ((netif = ip_route(&(pcb->remote_ip))) == NULL) { |
screamer | 0:7a64fbb4069d | 684 | LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr)); |
screamer | 0:7a64fbb4069d | 685 | UDP_STATS_INC(udp.rterr); |
screamer | 0:7a64fbb4069d | 686 | return ERR_RTE; |
screamer | 0:7a64fbb4069d | 687 | } |
screamer | 0:7a64fbb4069d | 688 | /** TODO: this will bind the udp pcb locally, to the interface which |
screamer | 0:7a64fbb4069d | 689 | is used to route output packets to the remote address. However, we |
screamer | 0:7a64fbb4069d | 690 | might want to accept incoming packets on any interface! */ |
screamer | 0:7a64fbb4069d | 691 | pcb->local_ip = netif->ip_addr; |
screamer | 0:7a64fbb4069d | 692 | } else if (ip_addr_isany(&pcb->remote_ip)) { |
screamer | 0:7a64fbb4069d | 693 | pcb->local_ip.addr = 0; |
screamer | 0:7a64fbb4069d | 694 | } |
screamer | 0:7a64fbb4069d | 695 | #endif |
screamer | 0:7a64fbb4069d | 696 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
screamer | 0:7a64fbb4069d | 697 | ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n", |
screamer | 0:7a64fbb4069d | 698 | (u16_t)((ntohl(pcb->remote_ip.addr) >> 24) & 0xff), |
screamer | 0:7a64fbb4069d | 699 | (u16_t)((ntohl(pcb->remote_ip.addr) >> 16) & 0xff), |
screamer | 0:7a64fbb4069d | 700 | (u16_t)((ntohl(pcb->remote_ip.addr) >> 8) & 0xff), |
screamer | 0:7a64fbb4069d | 701 | (u16_t)(ntohl(pcb->remote_ip.addr) & 0xff), pcb->remote_port)); |
screamer | 0:7a64fbb4069d | 702 | |
screamer | 0:7a64fbb4069d | 703 | /* Insert UDP PCB into the list of active UDP PCBs. */ |
screamer | 0:7a64fbb4069d | 704 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) { |
screamer | 0:7a64fbb4069d | 705 | if (pcb == ipcb) { |
screamer | 0:7a64fbb4069d | 706 | /* already on the list, just return */ |
screamer | 0:7a64fbb4069d | 707 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 708 | } |
screamer | 0:7a64fbb4069d | 709 | } |
screamer | 0:7a64fbb4069d | 710 | /* PCB not yet on the list, add PCB now */ |
screamer | 0:7a64fbb4069d | 711 | pcb->next = udp_pcbs; |
screamer | 0:7a64fbb4069d | 712 | udp_pcbs = pcb; |
screamer | 0:7a64fbb4069d | 713 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 714 | } |
screamer | 0:7a64fbb4069d | 715 | |
screamer | 0:7a64fbb4069d | 716 | /** |
screamer | 0:7a64fbb4069d | 717 | * Disconnect a UDP PCB |
screamer | 0:7a64fbb4069d | 718 | * |
screamer | 0:7a64fbb4069d | 719 | * @param pcb the udp pcb to disconnect. |
screamer | 0:7a64fbb4069d | 720 | */ |
screamer | 0:7a64fbb4069d | 721 | void |
screamer | 0:7a64fbb4069d | 722 | udp_disconnect(struct udp_pcb *pcb) |
screamer | 0:7a64fbb4069d | 723 | { |
screamer | 0:7a64fbb4069d | 724 | /* reset remote address association */ |
screamer | 0:7a64fbb4069d | 725 | ip_addr_set(&pcb->remote_ip, IP_ADDR_ANY); |
screamer | 0:7a64fbb4069d | 726 | pcb->remote_port = 0; |
screamer | 0:7a64fbb4069d | 727 | /* mark PCB as unconnected */ |
screamer | 0:7a64fbb4069d | 728 | pcb->flags &= ~UDP_FLAGS_CONNECTED; |
screamer | 0:7a64fbb4069d | 729 | } |
screamer | 0:7a64fbb4069d | 730 | |
screamer | 0:7a64fbb4069d | 731 | /** |
screamer | 0:7a64fbb4069d | 732 | * Set a receive callback for a UDP PCB |
screamer | 0:7a64fbb4069d | 733 | * |
screamer | 0:7a64fbb4069d | 734 | * This callback will be called when receiving a datagram for the pcb. |
screamer | 0:7a64fbb4069d | 735 | * |
screamer | 0:7a64fbb4069d | 736 | * @param pcb the pcb for wich to set the recv callback |
screamer | 0:7a64fbb4069d | 737 | * @param recv function pointer of the callback function |
screamer | 0:7a64fbb4069d | 738 | * @param recv_arg additional argument to pass to the callback function |
screamer | 0:7a64fbb4069d | 739 | */ |
screamer | 0:7a64fbb4069d | 740 | void |
screamer | 0:7a64fbb4069d | 741 | udp_recv(struct udp_pcb *pcb, |
screamer | 0:7a64fbb4069d | 742 | void (* recv)(void *arg, struct udp_pcb *upcb, struct pbuf *p, |
screamer | 0:7a64fbb4069d | 743 | struct ip_addr *addr, u16_t port), |
screamer | 0:7a64fbb4069d | 744 | void *recv_arg) |
screamer | 0:7a64fbb4069d | 745 | { |
screamer | 0:7a64fbb4069d | 746 | /* remember recv() callback and user data */ |
screamer | 0:7a64fbb4069d | 747 | pcb->recv = recv; |
screamer | 0:7a64fbb4069d | 748 | pcb->recv_arg = recv_arg; |
screamer | 0:7a64fbb4069d | 749 | } |
screamer | 0:7a64fbb4069d | 750 | |
screamer | 0:7a64fbb4069d | 751 | /** |
screamer | 0:7a64fbb4069d | 752 | * Remove an UDP PCB. |
screamer | 0:7a64fbb4069d | 753 | * |
screamer | 0:7a64fbb4069d | 754 | * @param pcb UDP PCB to be removed. The PCB is removed from the list of |
screamer | 0:7a64fbb4069d | 755 | * UDP PCB's and the data structure is freed from memory. |
screamer | 0:7a64fbb4069d | 756 | * |
screamer | 0:7a64fbb4069d | 757 | * @see udp_new() |
screamer | 0:7a64fbb4069d | 758 | */ |
screamer | 0:7a64fbb4069d | 759 | void |
screamer | 0:7a64fbb4069d | 760 | udp_remove(struct udp_pcb *pcb) |
screamer | 0:7a64fbb4069d | 761 | { |
screamer | 0:7a64fbb4069d | 762 | struct udp_pcb *pcb2; |
screamer | 0:7a64fbb4069d | 763 | |
screamer | 0:7a64fbb4069d | 764 | snmp_delete_udpidx_tree(pcb); |
screamer | 0:7a64fbb4069d | 765 | /* pcb to be removed is first in list? */ |
screamer | 0:7a64fbb4069d | 766 | if (udp_pcbs == pcb) { |
screamer | 0:7a64fbb4069d | 767 | /* make list start at 2nd pcb */ |
screamer | 0:7a64fbb4069d | 768 | udp_pcbs = udp_pcbs->next; |
screamer | 0:7a64fbb4069d | 769 | /* pcb not 1st in list */ |
screamer | 0:7a64fbb4069d | 770 | } else |
screamer | 0:7a64fbb4069d | 771 | for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) { |
screamer | 0:7a64fbb4069d | 772 | /* find pcb in udp_pcbs list */ |
screamer | 0:7a64fbb4069d | 773 | if (pcb2->next != NULL && pcb2->next == pcb) { |
screamer | 0:7a64fbb4069d | 774 | /* remove pcb from list */ |
screamer | 0:7a64fbb4069d | 775 | pcb2->next = pcb->next; |
screamer | 0:7a64fbb4069d | 776 | } |
screamer | 0:7a64fbb4069d | 777 | } |
screamer | 0:7a64fbb4069d | 778 | memp_free(MEMP_UDP_PCB, pcb); |
screamer | 0:7a64fbb4069d | 779 | } |
screamer | 0:7a64fbb4069d | 780 | |
screamer | 0:7a64fbb4069d | 781 | /** |
screamer | 0:7a64fbb4069d | 782 | * Create a UDP PCB. |
screamer | 0:7a64fbb4069d | 783 | * |
screamer | 0:7a64fbb4069d | 784 | * @return The UDP PCB which was created. NULL if the PCB data structure |
screamer | 0:7a64fbb4069d | 785 | * could not be allocated. |
screamer | 0:7a64fbb4069d | 786 | * |
screamer | 0:7a64fbb4069d | 787 | * @see udp_remove() |
screamer | 0:7a64fbb4069d | 788 | */ |
screamer | 0:7a64fbb4069d | 789 | struct udp_pcb * |
screamer | 0:7a64fbb4069d | 790 | udp_new(void) |
screamer | 0:7a64fbb4069d | 791 | { |
screamer | 0:7a64fbb4069d | 792 | struct udp_pcb *pcb; |
screamer | 0:7a64fbb4069d | 793 | pcb = (struct udp_pcb *)(memp_malloc(MEMP_UDP_PCB)); |
screamer | 0:7a64fbb4069d | 794 | /* could allocate UDP PCB? */ |
screamer | 0:7a64fbb4069d | 795 | if (pcb != NULL) { |
screamer | 0:7a64fbb4069d | 796 | /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0 |
screamer | 0:7a64fbb4069d | 797 | * which means checksum is generated over the whole datagram per default |
screamer | 0:7a64fbb4069d | 798 | * (recommended as default by RFC 3828). */ |
screamer | 0:7a64fbb4069d | 799 | /* initialize PCB to all zeroes */ |
screamer | 0:7a64fbb4069d | 800 | memset(pcb, 0, sizeof(struct udp_pcb)); |
screamer | 0:7a64fbb4069d | 801 | pcb->ttl = UDP_TTL; |
screamer | 0:7a64fbb4069d | 802 | } |
screamer | 0:7a64fbb4069d | 803 | return pcb; |
screamer | 0:7a64fbb4069d | 804 | } |
screamer | 0:7a64fbb4069d | 805 | |
screamer | 0:7a64fbb4069d | 806 | #if UDP_DEBUG |
screamer | 0:7a64fbb4069d | 807 | /** |
screamer | 0:7a64fbb4069d | 808 | * Print UDP header information for debug purposes. |
screamer | 0:7a64fbb4069d | 809 | * |
screamer | 0:7a64fbb4069d | 810 | * @param udphdr pointer to the udp header in memory. |
screamer | 0:7a64fbb4069d | 811 | */ |
screamer | 0:7a64fbb4069d | 812 | void |
screamer | 0:7a64fbb4069d | 813 | udp_debug_print(struct udp_hdr *udphdr) |
screamer | 0:7a64fbb4069d | 814 | { |
screamer | 0:7a64fbb4069d | 815 | LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n")); |
screamer | 0:7a64fbb4069d | 816 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
screamer | 0:7a64fbb4069d | 817 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n", |
screamer | 0:7a64fbb4069d | 818 | ntohs(udphdr->src), ntohs(udphdr->dest))); |
screamer | 0:7a64fbb4069d | 819 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
screamer | 0:7a64fbb4069d | 820 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n", |
screamer | 0:7a64fbb4069d | 821 | ntohs(udphdr->len), ntohs(udphdr->chksum))); |
screamer | 0:7a64fbb4069d | 822 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n")); |
screamer | 0:7a64fbb4069d | 823 | } |
screamer | 0:7a64fbb4069d | 824 | #endif /* UDP_DEBUG */ |
screamer | 0:7a64fbb4069d | 825 | |
screamer | 0:7a64fbb4069d | 826 | #endif /* LWIP_UDP */ |