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Embedded WebSockets Experiment

Core/lwIP/core/udp.c@0:6dee052a3fa4, 2011-07-26 (annotated)

Committer:: nandgate
Date:: Tue Jul 26 05:30:53 2011 +0000
Revision:: 0:6dee052a3fa4

Who changed what in which revision?

User	Revision	Line number	New contents of line
nandgate	0:6dee052a3fa4	1	/**
nandgate	0:6dee052a3fa4	2	* @file
nandgate	0:6dee052a3fa4	3	* User Datagram Protocol module
nandgate	0:6dee052a3fa4	4	*
nandgate	0:6dee052a3fa4	5	*/
nandgate	0:6dee052a3fa4	6
nandgate	0:6dee052a3fa4	7	/*
nandgate	0:6dee052a3fa4	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
nandgate	0:6dee052a3fa4	9	* All rights reserved.
nandgate	0:6dee052a3fa4	10	*
nandgate	0:6dee052a3fa4	11	* Redistribution and use in source and binary forms, with or without modification,
nandgate	0:6dee052a3fa4	12	* are permitted provided that the following conditions are met:
nandgate	0:6dee052a3fa4	13	*
nandgate	0:6dee052a3fa4	14	* 1. Redistributions of source code must retain the above copyright notice,
nandgate	0:6dee052a3fa4	15	* this list of conditions and the following disclaimer.
nandgate	0:6dee052a3fa4	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
nandgate	0:6dee052a3fa4	17	* this list of conditions and the following disclaimer in the documentation
nandgate	0:6dee052a3fa4	18	* and/or other materials provided with the distribution.
nandgate	0:6dee052a3fa4	19	* 3. The name of the author may not be used to endorse or promote products
nandgate	0:6dee052a3fa4	20	* derived from this software without specific prior written permission.
nandgate	0:6dee052a3fa4	21	*
nandgate	0:6dee052a3fa4	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
nandgate	0:6dee052a3fa4	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
nandgate	0:6dee052a3fa4	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
nandgate	0:6dee052a3fa4	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
nandgate	0:6dee052a3fa4	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
nandgate	0:6dee052a3fa4	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
nandgate	0:6dee052a3fa4	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
nandgate	0:6dee052a3fa4	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
nandgate	0:6dee052a3fa4	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
nandgate	0:6dee052a3fa4	31	* OF SUCH DAMAGE.
nandgate	0:6dee052a3fa4	32	*
nandgate	0:6dee052a3fa4	33	* This file is part of the lwIP TCP/IP stack.
nandgate	0:6dee052a3fa4	34	*
nandgate	0:6dee052a3fa4	35	* Author: Adam Dunkels <adam@sics.se>
nandgate	0:6dee052a3fa4	36	*
nandgate	0:6dee052a3fa4	37	*/
nandgate	0:6dee052a3fa4	38
nandgate	0:6dee052a3fa4	39
nandgate	0:6dee052a3fa4	40	/* udp.c
nandgate	0:6dee052a3fa4	41	*
nandgate	0:6dee052a3fa4	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
nandgate	0:6dee052a3fa4	43	*
nandgate	0:6dee052a3fa4	44	*/
nandgate	0:6dee052a3fa4	45
nandgate	0:6dee052a3fa4	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
nandgate	0:6dee052a3fa4	47	*/
nandgate	0:6dee052a3fa4	48
nandgate	0:6dee052a3fa4	49	#include "lwip/opt.h"
nandgate	0:6dee052a3fa4	50
nandgate	0:6dee052a3fa4	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
nandgate	0:6dee052a3fa4	52
nandgate	0:6dee052a3fa4	53	#include "lwip/udp.h"
nandgate	0:6dee052a3fa4	54	#include "lwip/def.h"
nandgate	0:6dee052a3fa4	55	#include "lwip/memp.h"
nandgate	0:6dee052a3fa4	56	#include "lwip/inet.h"
nandgate	0:6dee052a3fa4	57	#include "lwip/inet_chksum.h"
nandgate	0:6dee052a3fa4	58	#include "lwip/ip_addr.h"
nandgate	0:6dee052a3fa4	59	#include "lwip/netif.h"
nandgate	0:6dee052a3fa4	60	#include "lwip/icmp.h"
nandgate	0:6dee052a3fa4	61	#include "lwip/stats.h"
nandgate	0:6dee052a3fa4	62	#include "lwip/snmp.h"
nandgate	0:6dee052a3fa4	63	#include "arch/perf.h"
nandgate	0:6dee052a3fa4	64	#include "lwip/dhcp.h"
nandgate	0:6dee052a3fa4	65
nandgate	0:6dee052a3fa4	66	#include <string.h>
nandgate	0:6dee052a3fa4	67
nandgate	0:6dee052a3fa4	68	/* The list of UDP PCBs */
nandgate	0:6dee052a3fa4	69	/* exported in udp.h (was static) */
nandgate	0:6dee052a3fa4	70	struct udp_pcb *udp_pcbs;
nandgate	0:6dee052a3fa4	71
nandgate	0:6dee052a3fa4	72	/**
nandgate	0:6dee052a3fa4	73	* Process an incoming UDP datagram.
nandgate	0:6dee052a3fa4	74	*
nandgate	0:6dee052a3fa4	75	* Given an incoming UDP datagram (as a chain of pbufs) this function
nandgate	0:6dee052a3fa4	76	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
nandgate	0:6dee052a3fa4	77	* recv function. If no pcb is found or the datagram is incorrect, the
nandgate	0:6dee052a3fa4	78	* pbuf is freed.
nandgate	0:6dee052a3fa4	79	*
nandgate	0:6dee052a3fa4	80	* @param p pbuf to be demultiplexed to a UDP PCB.
nandgate	0:6dee052a3fa4	81	* @param inp network interface on which the datagram was received.
nandgate	0:6dee052a3fa4	82	*
nandgate	0:6dee052a3fa4	83	*/
nandgate	0:6dee052a3fa4	84	void
nandgate	0:6dee052a3fa4	85	udp_input(struct pbuf p, struct netif inp)
nandgate	0:6dee052a3fa4	86	{
nandgate	0:6dee052a3fa4	87	struct udp_hdr *udphdr;
nandgate	0:6dee052a3fa4	88	struct udp_pcb pcb, prev;
nandgate	0:6dee052a3fa4	89	struct udp_pcb *uncon_pcb;
nandgate	0:6dee052a3fa4	90	struct ip_hdr *iphdr;
nandgate	0:6dee052a3fa4	91	u16_t src, dest;
nandgate	0:6dee052a3fa4	92	u8_t local_match;
nandgate	0:6dee052a3fa4	93	u8_t broadcast;
nandgate	0:6dee052a3fa4	94
nandgate	0:6dee052a3fa4	95	PERF_START;
nandgate	0:6dee052a3fa4	96
nandgate	0:6dee052a3fa4	97	UDP_STATS_INC(udp.recv);
nandgate	0:6dee052a3fa4	98
nandgate	0:6dee052a3fa4	99	iphdr = (struct ip_hdr *)p->payload;
nandgate	0:6dee052a3fa4	100
nandgate	0:6dee052a3fa4	101	/* Check minimum length (IP header + UDP header)
nandgate	0:6dee052a3fa4	102	* and move payload pointer to UDP header */
nandgate	0:6dee052a3fa4	103	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
nandgate	0:6dee052a3fa4	104	/* drop short packets */
nandgate	0:6dee052a3fa4	105	LWIP_DEBUGF(UDP_DEBUG,
nandgate	0:6dee052a3fa4	106	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
nandgate	0:6dee052a3fa4	107	UDP_STATS_INC(udp.lenerr);
nandgate	0:6dee052a3fa4	108	UDP_STATS_INC(udp.drop);
nandgate	0:6dee052a3fa4	109	snmp_inc_udpinerrors();
nandgate	0:6dee052a3fa4	110	pbuf_free(p);
nandgate	0:6dee052a3fa4	111	goto end;
nandgate	0:6dee052a3fa4	112	}
nandgate	0:6dee052a3fa4	113
nandgate	0:6dee052a3fa4	114	udphdr = (struct udp_hdr *)p->payload;
nandgate	0:6dee052a3fa4	115
nandgate	0:6dee052a3fa4	116	/* is broadcast packet ? */
nandgate	0:6dee052a3fa4	117	broadcast = ip_addr_isbroadcast(&(iphdr->dest), inp);
nandgate	0:6dee052a3fa4	118
nandgate	0:6dee052a3fa4	119	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
nandgate	0:6dee052a3fa4	120
nandgate	0:6dee052a3fa4	121	/* convert src and dest ports to host byte order */
nandgate	0:6dee052a3fa4	122	src = ntohs(udphdr->src);
nandgate	0:6dee052a3fa4	123	dest = ntohs(udphdr->dest);
nandgate	0:6dee052a3fa4	124
nandgate	0:6dee052a3fa4	125	udp_debug_print(udphdr);
nandgate	0:6dee052a3fa4	126
nandgate	0:6dee052a3fa4	127	/* print the UDP source and destination */
nandgate	0:6dee052a3fa4	128	LWIP_DEBUGF(UDP_DEBUG,
nandgate	0:6dee052a3fa4	129	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
nandgate	0:6dee052a3fa4	130	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
nandgate	0:6dee052a3fa4	131	ip4_addr1(&iphdr->dest), ip4_addr2(&iphdr->dest),
nandgate	0:6dee052a3fa4	132	ip4_addr3(&iphdr->dest), ip4_addr4(&iphdr->dest), ntohs(udphdr->dest),
nandgate	0:6dee052a3fa4	133	ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src),
nandgate	0:6dee052a3fa4	134	ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src), ntohs(udphdr->src)));
nandgate	0:6dee052a3fa4	135
nandgate	0:6dee052a3fa4	136	#if LWIP_DHCP
nandgate	0:6dee052a3fa4	137	pcb = NULL;
nandgate	0:6dee052a3fa4	138	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
nandgate	0:6dee052a3fa4	139	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
nandgate	0:6dee052a3fa4	140	if (dest == DHCP_CLIENT_PORT) {
nandgate	0:6dee052a3fa4	141	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
nandgate	0:6dee052a3fa4	142	if (src == DHCP_SERVER_PORT) {
nandgate	0:6dee052a3fa4	143	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
nandgate	0:6dee052a3fa4	144	/* accept the packe if
nandgate	0:6dee052a3fa4	145	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
nandgate	0:6dee052a3fa4	146	- inp->dhcp->pcb->remote == ANY or iphdr->src */
nandgate	0:6dee052a3fa4	147	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
nandgate	0:6dee052a3fa4	148	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &(iphdr->src)))) {
nandgate	0:6dee052a3fa4	149	pcb = inp->dhcp->pcb;
nandgate	0:6dee052a3fa4	150	}
nandgate	0:6dee052a3fa4	151	}
nandgate	0:6dee052a3fa4	152	}
nandgate	0:6dee052a3fa4	153	} else
nandgate	0:6dee052a3fa4	154	#endif /* LWIP_DHCP */
nandgate	0:6dee052a3fa4	155	{
nandgate	0:6dee052a3fa4	156	prev = NULL;
nandgate	0:6dee052a3fa4	157	local_match = 0;
nandgate	0:6dee052a3fa4	158	uncon_pcb = NULL;
nandgate	0:6dee052a3fa4	159	/* Iterate through the UDP pcb list for a matching pcb.
nandgate	0:6dee052a3fa4	160	* 'Perfect match' pcbs (connected to the remote port & ip address) are
nandgate	0:6dee052a3fa4	161	* preferred. If no perfect match is found, the first unconnected pcb that
nandgate	0:6dee052a3fa4	162	* matches the local port and ip address gets the datagram. */
nandgate	0:6dee052a3fa4	163	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
nandgate	0:6dee052a3fa4	164	local_match = 0;
nandgate	0:6dee052a3fa4	165	/* print the PCB local and remote address */
nandgate	0:6dee052a3fa4	166	LWIP_DEBUGF(UDP_DEBUG,
nandgate	0:6dee052a3fa4	167	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
nandgate	0:6dee052a3fa4	168	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
nandgate	0:6dee052a3fa4	169	ip4_addr1(&pcb->local_ip), ip4_addr2(&pcb->local_ip),
nandgate	0:6dee052a3fa4	170	ip4_addr3(&pcb->local_ip), ip4_addr4(&pcb->local_ip), pcb->local_port,
nandgate	0:6dee052a3fa4	171	ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip),
nandgate	0:6dee052a3fa4	172	ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port));
nandgate	0:6dee052a3fa4	173
nandgate	0:6dee052a3fa4	174	/* compare PCB local addr+port to UDP destination addr+port */
nandgate	0:6dee052a3fa4	175	if ((pcb->local_port == dest) &&
nandgate	0:6dee052a3fa4	176	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
nandgate	0:6dee052a3fa4	177	ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)) \|\|
nandgate	0:6dee052a3fa4	178	#if LWIP_IGMP
nandgate	0:6dee052a3fa4	179	ip_addr_ismulticast(&(iphdr->dest)) \|\|
nandgate	0:6dee052a3fa4	180	#endif /* LWIP_IGMP */
nandgate	0:6dee052a3fa4	181	#if IP_SOF_BROADCAST_RECV
nandgate	0:6dee052a3fa4	182	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
nandgate	0:6dee052a3fa4	183	#else /* IP_SOF_BROADCAST_RECV */
nandgate	0:6dee052a3fa4	184	(broadcast))) {
nandgate	0:6dee052a3fa4	185	#endif /* IP_SOF_BROADCAST_RECV */
nandgate	0:6dee052a3fa4	186	local_match = 1;
nandgate	0:6dee052a3fa4	187	if ((uncon_pcb == NULL) &&
nandgate	0:6dee052a3fa4	188	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
nandgate	0:6dee052a3fa4	189	/* the first unconnected matching PCB */
nandgate	0:6dee052a3fa4	190	uncon_pcb = pcb;
nandgate	0:6dee052a3fa4	191	}
nandgate	0:6dee052a3fa4	192	}
nandgate	0:6dee052a3fa4	193	/* compare PCB remote addr+port to UDP source addr+port */
nandgate	0:6dee052a3fa4	194	if ((local_match != 0) &&
nandgate	0:6dee052a3fa4	195	(pcb->remote_port == src) &&
nandgate	0:6dee052a3fa4	196	(ip_addr_isany(&pcb->remote_ip) \|\|
nandgate	0:6dee052a3fa4	197	ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) {
nandgate	0:6dee052a3fa4	198	/* the first fully matching PCB */
nandgate	0:6dee052a3fa4	199	if (prev != NULL) {
nandgate	0:6dee052a3fa4	200	/* move the pcb to the front of udp_pcbs so that is
nandgate	0:6dee052a3fa4	201	found faster next time */
nandgate	0:6dee052a3fa4	202	prev->next = pcb->next;
nandgate	0:6dee052a3fa4	203	pcb->next = udp_pcbs;
nandgate	0:6dee052a3fa4	204	udp_pcbs = pcb;
nandgate	0:6dee052a3fa4	205	} else {
nandgate	0:6dee052a3fa4	206	UDP_STATS_INC(udp.cachehit);
nandgate	0:6dee052a3fa4	207	}
nandgate	0:6dee052a3fa4	208	break;
nandgate	0:6dee052a3fa4	209	}
nandgate	0:6dee052a3fa4	210	prev = pcb;
nandgate	0:6dee052a3fa4	211	}
nandgate	0:6dee052a3fa4	212	/* no fully matching pcb found? then look for an unconnected pcb */
nandgate	0:6dee052a3fa4	213	if (pcb == NULL) {
nandgate	0:6dee052a3fa4	214	pcb = uncon_pcb;
nandgate	0:6dee052a3fa4	215	}
nandgate	0:6dee052a3fa4	216	}
nandgate	0:6dee052a3fa4	217
nandgate	0:6dee052a3fa4	218	/* Check checksum if this is a match or if it was directed at us. */
nandgate	0:6dee052a3fa4	219	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &iphdr->dest)) {
nandgate	0:6dee052a3fa4	220	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
nandgate	0:6dee052a3fa4	221	#if LWIP_UDPLITE
nandgate	0:6dee052a3fa4	222	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
nandgate	0:6dee052a3fa4	223	/* Do the UDP Lite checksum */
nandgate	0:6dee052a3fa4	224	#if CHECKSUM_CHECK_UDP
nandgate	0:6dee052a3fa4	225	u16_t chklen = ntohs(udphdr->len);
nandgate	0:6dee052a3fa4	226	if (chklen < sizeof(struct udp_hdr)) {
nandgate	0:6dee052a3fa4	227	if (chklen == 0) {
nandgate	0:6dee052a3fa4	228	/* For UDP-Lite, checksum length of 0 means checksum
nandgate	0:6dee052a3fa4	229	over the complete packet (See RFC 3828 chap. 3.1) */
nandgate	0:6dee052a3fa4	230	chklen = p->tot_len;
nandgate	0:6dee052a3fa4	231	} else {
nandgate	0:6dee052a3fa4	232	/* At least the UDP-Lite header must be covered by the
nandgate	0:6dee052a3fa4	233	checksum! (Again, see RFC 3828 chap. 3.1) */
nandgate	0:6dee052a3fa4	234	UDP_STATS_INC(udp.chkerr);
nandgate	0:6dee052a3fa4	235	UDP_STATS_INC(udp.drop);
nandgate	0:6dee052a3fa4	236	snmp_inc_udpinerrors();
nandgate	0:6dee052a3fa4	237	pbuf_free(p);
nandgate	0:6dee052a3fa4	238	goto end;
nandgate	0:6dee052a3fa4	239	}
nandgate	0:6dee052a3fa4	240	}
nandgate	0:6dee052a3fa4	241	if (inet_chksum_pseudo_partial(p, (struct ip_addr *)&(iphdr->src),
nandgate	0:6dee052a3fa4	242	(struct ip_addr *)&(iphdr->dest),
nandgate	0:6dee052a3fa4	243	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
nandgate	0:6dee052a3fa4	244	LWIP_DEBUGF(UDP_DEBUG \| 2,
nandgate	0:6dee052a3fa4	245	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
nandgate	0:6dee052a3fa4	246	UDP_STATS_INC(udp.chkerr);
nandgate	0:6dee052a3fa4	247	UDP_STATS_INC(udp.drop);
nandgate	0:6dee052a3fa4	248	snmp_inc_udpinerrors();
nandgate	0:6dee052a3fa4	249	pbuf_free(p);
nandgate	0:6dee052a3fa4	250	goto end;
nandgate	0:6dee052a3fa4	251	}
nandgate	0:6dee052a3fa4	252	#endif /* CHECKSUM_CHECK_UDP */
nandgate	0:6dee052a3fa4	253	} else
nandgate	0:6dee052a3fa4	254	#endif /* LWIP_UDPLITE */
nandgate	0:6dee052a3fa4	255	{
nandgate	0:6dee052a3fa4	256	#if CHECKSUM_CHECK_UDP
nandgate	0:6dee052a3fa4	257	if (udphdr->chksum != 0) {
nandgate	0:6dee052a3fa4	258	if (inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),
nandgate	0:6dee052a3fa4	259	(struct ip_addr *)&(iphdr->dest),
nandgate	0:6dee052a3fa4	260	IP_PROTO_UDP, p->tot_len) != 0) {
nandgate	0:6dee052a3fa4	261	LWIP_DEBUGF(UDP_DEBUG \| 2,
nandgate	0:6dee052a3fa4	262	("udp_input: UDP datagram discarded due to failing checksum\n"));
nandgate	0:6dee052a3fa4	263	UDP_STATS_INC(udp.chkerr);
nandgate	0:6dee052a3fa4	264	UDP_STATS_INC(udp.drop);
nandgate	0:6dee052a3fa4	265	snmp_inc_udpinerrors();
nandgate	0:6dee052a3fa4	266	pbuf_free(p);
nandgate	0:6dee052a3fa4	267	goto end;
nandgate	0:6dee052a3fa4	268	}
nandgate	0:6dee052a3fa4	269	}
nandgate	0:6dee052a3fa4	270	#endif /* CHECKSUM_CHECK_UDP */
nandgate	0:6dee052a3fa4	271	}
nandgate	0:6dee052a3fa4	272	if(pbuf_header(p, -UDP_HLEN)) {
nandgate	0:6dee052a3fa4	273	/* Can we cope with this failing? Just assert for now */
nandgate	0:6dee052a3fa4	274	LWIP_ASSERT("pbuf_header failed\n", 0);
nandgate	0:6dee052a3fa4	275	UDP_STATS_INC(udp.drop);
nandgate	0:6dee052a3fa4	276	snmp_inc_udpinerrors();
nandgate	0:6dee052a3fa4	277	pbuf_free(p);
nandgate	0:6dee052a3fa4	278	goto end;
nandgate	0:6dee052a3fa4	279	}
nandgate	0:6dee052a3fa4	280	if (pcb != NULL) {
nandgate	0:6dee052a3fa4	281	snmp_inc_udpindatagrams();
nandgate	0:6dee052a3fa4	282	/* callback */
nandgate	0:6dee052a3fa4	283	if (pcb->recv != NULL) {
nandgate	0:6dee052a3fa4	284	/* now the recv function is responsible for freeing p */
nandgate	0:6dee052a3fa4	285	pcb->recv(pcb->recv_arg, pcb, p, &iphdr->src, src);
nandgate	0:6dee052a3fa4	286	} else {
nandgate	0:6dee052a3fa4	287	/* no recv function registered? then we have to free the pbuf! */
nandgate	0:6dee052a3fa4	288	pbuf_free(p);
nandgate	0:6dee052a3fa4	289	goto end;
nandgate	0:6dee052a3fa4	290	}
nandgate	0:6dee052a3fa4	291	} else {
nandgate	0:6dee052a3fa4	292	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
nandgate	0:6dee052a3fa4	293
nandgate	0:6dee052a3fa4	294	#if LWIP_ICMP
nandgate	0:6dee052a3fa4	295	/* No match was found, send ICMP destination port unreachable unless
nandgate	0:6dee052a3fa4	296	destination address was broadcast/multicast. */
nandgate	0:6dee052a3fa4	297	if (!broadcast &&
nandgate	0:6dee052a3fa4	298	!ip_addr_ismulticast(&iphdr->dest)) {
nandgate	0:6dee052a3fa4	299	/* move payload pointer back to ip header */
nandgate	0:6dee052a3fa4	300	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
nandgate	0:6dee052a3fa4	301	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
nandgate	0:6dee052a3fa4	302	icmp_dest_unreach(p, ICMP_DUR_PORT);
nandgate	0:6dee052a3fa4	303	}
nandgate	0:6dee052a3fa4	304	#endif /* LWIP_ICMP */
nandgate	0:6dee052a3fa4	305	UDP_STATS_INC(udp.proterr);
nandgate	0:6dee052a3fa4	306	UDP_STATS_INC(udp.drop);
nandgate	0:6dee052a3fa4	307	snmp_inc_udpnoports();
nandgate	0:6dee052a3fa4	308	pbuf_free(p);
nandgate	0:6dee052a3fa4	309	}
nandgate	0:6dee052a3fa4	310	} else {
nandgate	0:6dee052a3fa4	311	pbuf_free(p);
nandgate	0:6dee052a3fa4	312	}
nandgate	0:6dee052a3fa4	313	end:
nandgate	0:6dee052a3fa4	314	PERF_STOP("udp_input");
nandgate	0:6dee052a3fa4	315	}
nandgate	0:6dee052a3fa4	316
nandgate	0:6dee052a3fa4	317	/**
nandgate	0:6dee052a3fa4	318	* Send data using UDP.
nandgate	0:6dee052a3fa4	319	*
nandgate	0:6dee052a3fa4	320	* @param pcb UDP PCB used to send the data.
nandgate	0:6dee052a3fa4	321	* @param p chain of pbuf's to be sent.
nandgate	0:6dee052a3fa4	322	*
nandgate	0:6dee052a3fa4	323	* The datagram will be sent to the current remote_ip & remote_port
nandgate	0:6dee052a3fa4	324	* stored in pcb. If the pcb is not bound to a port, it will
nandgate	0:6dee052a3fa4	325	* automatically be bound to a random port.
nandgate	0:6dee052a3fa4	326	*
nandgate	0:6dee052a3fa4	327	* @return lwIP error code.
nandgate	0:6dee052a3fa4	328	* - ERR_OK. Successful. No error occured.
nandgate	0:6dee052a3fa4	329	* - ERR_MEM. Out of memory.
nandgate	0:6dee052a3fa4	330	* - ERR_RTE. Could not find route to destination address.
nandgate	0:6dee052a3fa4	331	* - More errors could be returned by lower protocol layers.
nandgate	0:6dee052a3fa4	332	*
nandgate	0:6dee052a3fa4	333	* @see udp_disconnect() udp_sendto()
nandgate	0:6dee052a3fa4	334	*/
nandgate	0:6dee052a3fa4	335	err_t
nandgate	0:6dee052a3fa4	336	udp_send(struct udp_pcb pcb, struct pbuf p)
nandgate	0:6dee052a3fa4	337	{
nandgate	0:6dee052a3fa4	338	/* send to the packet using remote ip and port stored in the pcb */
nandgate	0:6dee052a3fa4	339	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
nandgate	0:6dee052a3fa4	340	}
nandgate	0:6dee052a3fa4	341
nandgate	0:6dee052a3fa4	342	/**
nandgate	0:6dee052a3fa4	343	* Send data to a specified address using UDP.
nandgate	0:6dee052a3fa4	344	*
nandgate	0:6dee052a3fa4	345	* @param pcb UDP PCB used to send the data.
nandgate	0:6dee052a3fa4	346	* @param p chain of pbuf's to be sent.
nandgate	0:6dee052a3fa4	347	* @param dst_ip Destination IP address.
nandgate	0:6dee052a3fa4	348	* @param dst_port Destination UDP port.
nandgate	0:6dee052a3fa4	349	*
nandgate	0:6dee052a3fa4	350	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
nandgate	0:6dee052a3fa4	351	*
nandgate	0:6dee052a3fa4	352	* If the PCB already has a remote address association, it will
nandgate	0:6dee052a3fa4	353	* be restored after the data is sent.
nandgate	0:6dee052a3fa4	354	*
nandgate	0:6dee052a3fa4	355	* @return lwIP error code (@see udp_send for possible error codes)
nandgate	0:6dee052a3fa4	356	*
nandgate	0:6dee052a3fa4	357	* @see udp_disconnect() udp_send()
nandgate	0:6dee052a3fa4	358	*/
nandgate	0:6dee052a3fa4	359	err_t
nandgate	0:6dee052a3fa4	360	udp_sendto(struct udp_pcb pcb, struct pbuf p,
nandgate	0:6dee052a3fa4	361	struct ip_addr *dst_ip, u16_t dst_port)
nandgate	0:6dee052a3fa4	362	{
nandgate	0:6dee052a3fa4	363	struct netif *netif;
nandgate	0:6dee052a3fa4	364
nandgate	0:6dee052a3fa4	365	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| 3, ("udp_send\n"));
nandgate	0:6dee052a3fa4	366
nandgate	0:6dee052a3fa4	367	/* find the outgoing network interface for this packet */
nandgate	0:6dee052a3fa4	368	#if LWIP_IGMP
nandgate	0:6dee052a3fa4	369	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
nandgate	0:6dee052a3fa4	370	#else
nandgate	0:6dee052a3fa4	371	netif = ip_route(dst_ip);
nandgate	0:6dee052a3fa4	372	#endif /* LWIP_IGMP */
nandgate	0:6dee052a3fa4	373
nandgate	0:6dee052a3fa4	374	/* no outgoing network interface could be found? */
nandgate	0:6dee052a3fa4	375	if (netif == NULL) {
nandgate	0:6dee052a3fa4	376	LWIP_DEBUGF(UDP_DEBUG \| 1, ("udp_send: No route to 0x%"X32_F"\n", dst_ip->addr));
nandgate	0:6dee052a3fa4	377	UDP_STATS_INC(udp.rterr);
nandgate	0:6dee052a3fa4	378	return ERR_RTE;
nandgate	0:6dee052a3fa4	379	}
nandgate	0:6dee052a3fa4	380	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
nandgate	0:6dee052a3fa4	381	}
nandgate	0:6dee052a3fa4	382
nandgate	0:6dee052a3fa4	383	/**
nandgate	0:6dee052a3fa4	384	* Send data to a specified address using UDP.
nandgate	0:6dee052a3fa4	385	* The netif used for sending can be specified.
nandgate	0:6dee052a3fa4	386	*
nandgate	0:6dee052a3fa4	387	* This function exists mainly for DHCP, to be able to send UDP packets
nandgate	0:6dee052a3fa4	388	* on a netif that is still down.
nandgate	0:6dee052a3fa4	389	*
nandgate	0:6dee052a3fa4	390	* @param pcb UDP PCB used to send the data.
nandgate	0:6dee052a3fa4	391	* @param p chain of pbuf's to be sent.
nandgate	0:6dee052a3fa4	392	* @param dst_ip Destination IP address.
nandgate	0:6dee052a3fa4	393	* @param dst_port Destination UDP port.
nandgate	0:6dee052a3fa4	394	* @param netif the netif used for sending.
nandgate	0:6dee052a3fa4	395	*
nandgate	0:6dee052a3fa4	396	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
nandgate	0:6dee052a3fa4	397	*
nandgate	0:6dee052a3fa4	398	* @return lwIP error code (@see udp_send for possible error codes)
nandgate	0:6dee052a3fa4	399	*
nandgate	0:6dee052a3fa4	400	* @see udp_disconnect() udp_send()
nandgate	0:6dee052a3fa4	401	*/
nandgate	0:6dee052a3fa4	402	err_t
nandgate	0:6dee052a3fa4	403	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
nandgate	0:6dee052a3fa4	404	struct ip_addr dst_ip, u16_t dst_port, struct netif netif)
nandgate	0:6dee052a3fa4	405	{
nandgate	0:6dee052a3fa4	406	struct udp_hdr *udphdr;
nandgate	0:6dee052a3fa4	407	struct ip_addr *src_ip;
nandgate	0:6dee052a3fa4	408	err_t err;
nandgate	0:6dee052a3fa4	409	struct pbuf q; / q will be sent down the stack */
nandgate	0:6dee052a3fa4	410
nandgate	0:6dee052a3fa4	411	#if IP_SOF_BROADCAST
nandgate	0:6dee052a3fa4	412	/* broadcast filter? */
nandgate	0:6dee052a3fa4	413	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
nandgate	0:6dee052a3fa4	414	LWIP_DEBUGF(UDP_DEBUG \| 1, ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
nandgate	0:6dee052a3fa4	415	return ERR_VAL;
nandgate	0:6dee052a3fa4	416	}
nandgate	0:6dee052a3fa4	417	#endif /* IP_SOF_BROADCAST */
nandgate	0:6dee052a3fa4	418
nandgate	0:6dee052a3fa4	419	/* if the PCB is not yet bound to a port, bind it here */
nandgate	0:6dee052a3fa4	420	if (pcb->local_port == 0) {
nandgate	0:6dee052a3fa4	421	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| 2, ("udp_send: not yet bound to a port, binding now\n"));
nandgate	0:6dee052a3fa4	422	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
nandgate	0:6dee052a3fa4	423	if (err != ERR_OK) {
nandgate	0:6dee052a3fa4	424	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| 2, ("udp_send: forced port bind failed\n"));
nandgate	0:6dee052a3fa4	425	return err;
nandgate	0:6dee052a3fa4	426	}
nandgate	0:6dee052a3fa4	427	}
nandgate	0:6dee052a3fa4	428
nandgate	0:6dee052a3fa4	429	/* not enough space to add an UDP header to first pbuf in given p chain? */
nandgate	0:6dee052a3fa4	430	if (pbuf_header(p, UDP_HLEN)) {
nandgate	0:6dee052a3fa4	431	/* allocate header in a separate new pbuf */
nandgate	0:6dee052a3fa4	432	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
nandgate	0:6dee052a3fa4	433	/* new header pbuf could not be allocated? */
nandgate	0:6dee052a3fa4	434	if (q == NULL) {
nandgate	0:6dee052a3fa4	435	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| 2, ("udp_send: could not allocate header\n"));
nandgate	0:6dee052a3fa4	436	return ERR_MEM;
nandgate	0:6dee052a3fa4	437	}
nandgate	0:6dee052a3fa4	438	/* chain header q in front of given pbuf p */
nandgate	0:6dee052a3fa4	439	pbuf_chain(q, p);
nandgate	0:6dee052a3fa4	440	/* first pbuf q points to header pbuf */
nandgate	0:6dee052a3fa4	441	LWIP_DEBUGF(UDP_DEBUG,
nandgate	0:6dee052a3fa4	442	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
nandgate	0:6dee052a3fa4	443	} else {
nandgate	0:6dee052a3fa4	444	/* adding space for header within p succeeded */
nandgate	0:6dee052a3fa4	445	/* first pbuf q equals given pbuf */
nandgate	0:6dee052a3fa4	446	q = p;
nandgate	0:6dee052a3fa4	447	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
nandgate	0:6dee052a3fa4	448	}
nandgate	0:6dee052a3fa4	449	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
nandgate	0:6dee052a3fa4	450	(q->len >= sizeof(struct udp_hdr)));
nandgate	0:6dee052a3fa4	451	/* q now represents the packet to be sent */
nandgate	0:6dee052a3fa4	452	udphdr = (struct udp_hdr *)q->payload;
nandgate	0:6dee052a3fa4	453	udphdr->src = htons(pcb->local_port);
nandgate	0:6dee052a3fa4	454	udphdr->dest = htons(dst_port);
nandgate	0:6dee052a3fa4	455	/* in UDP, 0 checksum means 'no checksum' */
nandgate	0:6dee052a3fa4	456	udphdr->chksum = 0x0000;
nandgate	0:6dee052a3fa4	457
nandgate	0:6dee052a3fa4	458	/* PCB local address is IP_ANY_ADDR? */
nandgate	0:6dee052a3fa4	459	if (ip_addr_isany(&pcb->local_ip)) {
nandgate	0:6dee052a3fa4	460	/* use outgoing network interface IP address as source address */
nandgate	0:6dee052a3fa4	461	src_ip = &(netif->ip_addr);
nandgate	0:6dee052a3fa4	462	} else {
nandgate	0:6dee052a3fa4	463	/* check if UDP PCB local IP address is correct
nandgate	0:6dee052a3fa4	464	* this could be an old address if netif->ip_addr has changed */
nandgate	0:6dee052a3fa4	465	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
nandgate	0:6dee052a3fa4	466	/* local_ip doesn't match, drop the packet */
nandgate	0:6dee052a3fa4	467	if (q != p) {
nandgate	0:6dee052a3fa4	468	/* free the header pbuf */
nandgate	0:6dee052a3fa4	469	pbuf_free(q);
nandgate	0:6dee052a3fa4	470	q = NULL;
nandgate	0:6dee052a3fa4	471	/* p is still referenced by the caller, and will live on */
nandgate	0:6dee052a3fa4	472	}
nandgate	0:6dee052a3fa4	473	return ERR_VAL;
nandgate	0:6dee052a3fa4	474	}
nandgate	0:6dee052a3fa4	475	/* use UDP PCB local IP address as source address */
nandgate	0:6dee052a3fa4	476	src_ip = &(pcb->local_ip);
nandgate	0:6dee052a3fa4	477	}
nandgate	0:6dee052a3fa4	478
nandgate	0:6dee052a3fa4	479	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
nandgate	0:6dee052a3fa4	480
nandgate	0:6dee052a3fa4	481	#if LWIP_UDPLITE
nandgate	0:6dee052a3fa4	482	/* UDP Lite protocol? */
nandgate	0:6dee052a3fa4	483	if (pcb->flags & UDP_FLAGS_UDPLITE) {
nandgate	0:6dee052a3fa4	484	u16_t chklen, chklen_hdr;
nandgate	0:6dee052a3fa4	485	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
nandgate	0:6dee052a3fa4	486	/* set UDP message length in UDP header */
nandgate	0:6dee052a3fa4	487	chklen_hdr = chklen = pcb->chksum_len_tx;
nandgate	0:6dee052a3fa4	488	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
nandgate	0:6dee052a3fa4	489	if (chklen != 0) {
nandgate	0:6dee052a3fa4	490	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
nandgate	0:6dee052a3fa4	491	}
nandgate	0:6dee052a3fa4	492	/* For UDP-Lite, checksum length of 0 means checksum
nandgate	0:6dee052a3fa4	493	over the complete packet. (See RFC 3828 chap. 3.1)
nandgate	0:6dee052a3fa4	494	At least the UDP-Lite header must be covered by the
nandgate	0:6dee052a3fa4	495	checksum, therefore, if chksum_len has an illegal
nandgate	0:6dee052a3fa4	496	value, we generate the checksum over the complete
nandgate	0:6dee052a3fa4	497	packet to be safe. */
nandgate	0:6dee052a3fa4	498	chklen_hdr = 0;
nandgate	0:6dee052a3fa4	499	chklen = q->tot_len;
nandgate	0:6dee052a3fa4	500	}
nandgate	0:6dee052a3fa4	501	udphdr->len = htons(chklen_hdr);
nandgate	0:6dee052a3fa4	502	/* calculate checksum */
nandgate	0:6dee052a3fa4	503	#if CHECKSUM_GEN_UDP
nandgate	0:6dee052a3fa4	504	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
nandgate	0:6dee052a3fa4	505	IP_PROTO_UDPLITE, q->tot_len, chklen);
nandgate	0:6dee052a3fa4	506	/* chksum zero must become 0xffff, as zero means 'no checksum' */
nandgate	0:6dee052a3fa4	507	if (udphdr->chksum == 0x0000)
nandgate	0:6dee052a3fa4	508	udphdr->chksum = 0xffff;
nandgate	0:6dee052a3fa4	509	#endif /* CHECKSUM_CHECK_UDP */
nandgate	0:6dee052a3fa4	510	/* output to IP */
nandgate	0:6dee052a3fa4	511	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
nandgate	0:6dee052a3fa4	512	#if LWIP_NETIF_HWADDRHINT
nandgate	0:6dee052a3fa4	513	netif->addr_hint = &(pcb->addr_hint);
nandgate	0:6dee052a3fa4	514	#endif /* LWIP_NETIF_HWADDRHINT*/
nandgate	0:6dee052a3fa4	515	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
nandgate	0:6dee052a3fa4	516	#if LWIP_NETIF_HWADDRHINT
nandgate	0:6dee052a3fa4	517	netif->addr_hint = NULL;
nandgate	0:6dee052a3fa4	518	#endif /* LWIP_NETIF_HWADDRHINT*/
nandgate	0:6dee052a3fa4	519	} else
nandgate	0:6dee052a3fa4	520	#endif /* LWIP_UDPLITE */
nandgate	0:6dee052a3fa4	521	{ /* UDP */
nandgate	0:6dee052a3fa4	522	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
nandgate	0:6dee052a3fa4	523	udphdr->len = htons(q->tot_len);
nandgate	0:6dee052a3fa4	524	/* calculate checksum */
nandgate	0:6dee052a3fa4	525	#if CHECKSUM_GEN_UDP
nandgate	0:6dee052a3fa4	526	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
nandgate	0:6dee052a3fa4	527	udphdr->chksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
nandgate	0:6dee052a3fa4	528	/* chksum zero must become 0xffff, as zero means 'no checksum' */
nandgate	0:6dee052a3fa4	529	if (udphdr->chksum == 0x0000) udphdr->chksum = 0xffff;
nandgate	0:6dee052a3fa4	530	}
nandgate	0:6dee052a3fa4	531	#endif /* CHECKSUM_CHECK_UDP */
nandgate	0:6dee052a3fa4	532	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
nandgate	0:6dee052a3fa4	533	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
nandgate	0:6dee052a3fa4	534	/* output to IP */
nandgate	0:6dee052a3fa4	535	#if LWIP_NETIF_HWADDRHINT
nandgate	0:6dee052a3fa4	536	netif->addr_hint = &(pcb->addr_hint);
nandgate	0:6dee052a3fa4	537	#endif /* LWIP_NETIF_HWADDRHINT*/
nandgate	0:6dee052a3fa4	538	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
nandgate	0:6dee052a3fa4	539	#if LWIP_NETIF_HWADDRHINT
nandgate	0:6dee052a3fa4	540	netif->addr_hint = NULL;
nandgate	0:6dee052a3fa4	541	#endif /* LWIP_NETIF_HWADDRHINT*/
nandgate	0:6dee052a3fa4	542	}
nandgate	0:6dee052a3fa4	543	/* TODO: must this be increased even if error occured? */
nandgate	0:6dee052a3fa4	544	snmp_inc_udpoutdatagrams();
nandgate	0:6dee052a3fa4	545
nandgate	0:6dee052a3fa4	546	/* did we chain a separate header pbuf earlier? */
nandgate	0:6dee052a3fa4	547	if (q != p) {
nandgate	0:6dee052a3fa4	548	/* free the header pbuf */
nandgate	0:6dee052a3fa4	549	pbuf_free(q);
nandgate	0:6dee052a3fa4	550	q = NULL;
nandgate	0:6dee052a3fa4	551	/* p is still referenced by the caller, and will live on */
nandgate	0:6dee052a3fa4	552	}
nandgate	0:6dee052a3fa4	553
nandgate	0:6dee052a3fa4	554	UDP_STATS_INC(udp.xmit);
nandgate	0:6dee052a3fa4	555	return err;
nandgate	0:6dee052a3fa4	556	}
nandgate	0:6dee052a3fa4	557
nandgate	0:6dee052a3fa4	558	/**
nandgate	0:6dee052a3fa4	559	* Bind an UDP PCB.
nandgate	0:6dee052a3fa4	560	*
nandgate	0:6dee052a3fa4	561	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
nandgate	0:6dee052a3fa4	562	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
nandgate	0:6dee052a3fa4	563	* bind to all local interfaces.
nandgate	0:6dee052a3fa4	564	* @param port local UDP port to bind with. Use 0 to automatically bind
nandgate	0:6dee052a3fa4	565	* to a random port between UDP_LOCAL_PORT_RANGE_START and
nandgate	0:6dee052a3fa4	566	* UDP_LOCAL_PORT_RANGE_END.
nandgate	0:6dee052a3fa4	567	*
nandgate	0:6dee052a3fa4	568	* ipaddr & port are expected to be in the same byte order as in the pcb.
nandgate	0:6dee052a3fa4	569	*
nandgate	0:6dee052a3fa4	570	* @return lwIP error code.
nandgate	0:6dee052a3fa4	571	* - ERR_OK. Successful. No error occured.
nandgate	0:6dee052a3fa4	572	* - ERR_USE. The specified ipaddr and port are already bound to by
nandgate	0:6dee052a3fa4	573	* another UDP PCB.
nandgate	0:6dee052a3fa4	574	*
nandgate	0:6dee052a3fa4	575	* @see udp_disconnect()
nandgate	0:6dee052a3fa4	576	*/
nandgate	0:6dee052a3fa4	577	err_t
nandgate	0:6dee052a3fa4	578	udp_bind(struct udp_pcb pcb, struct ip_addr ipaddr, u16_t port)
nandgate	0:6dee052a3fa4	579	{
nandgate	0:6dee052a3fa4	580	struct udp_pcb *ipcb;
nandgate	0:6dee052a3fa4	581	u8_t rebind;
nandgate	0:6dee052a3fa4	582
nandgate	0:6dee052a3fa4	583	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| 3, ("udp_bind(ipaddr = "));
nandgate	0:6dee052a3fa4	584	ip_addr_debug_print(UDP_DEBUG, ipaddr);
nandgate	0:6dee052a3fa4	585	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| 3, (", port = %"U16_F")\n", port));
nandgate	0:6dee052a3fa4	586
nandgate	0:6dee052a3fa4	587	rebind = 0;
nandgate	0:6dee052a3fa4	588	/* Check for double bind and rebind of the same pcb */
nandgate	0:6dee052a3fa4	589	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
nandgate	0:6dee052a3fa4	590	/* is this UDP PCB already on active list? */
nandgate	0:6dee052a3fa4	591	if (pcb == ipcb) {
nandgate	0:6dee052a3fa4	592	/* pcb may occur at most once in active list */
nandgate	0:6dee052a3fa4	593	LWIP_ASSERT("rebind == 0", rebind == 0);
nandgate	0:6dee052a3fa4	594	/* pcb already in list, just rebind */
nandgate	0:6dee052a3fa4	595	rebind = 1;
nandgate	0:6dee052a3fa4	596	}
nandgate	0:6dee052a3fa4	597
nandgate	0:6dee052a3fa4	598	/* this code does not allow upper layer to share a UDP port for
nandgate	0:6dee052a3fa4	599	listening to broadcast or multicast traffic (See SO_REUSE_ADDR and
nandgate	0:6dee052a3fa4	600	SO_REUSE_PORT under *BSD). TODO: See where it fits instead, OR
nandgate	0:6dee052a3fa4	601	combine with implementation of UDP PCB flags. Leon Woestenberg. */
nandgate	0:6dee052a3fa4	602	#ifdef LWIP_UDP_TODO
nandgate	0:6dee052a3fa4	603	/* port matches that of PCB in list? */
nandgate	0:6dee052a3fa4	604	else
nandgate	0:6dee052a3fa4	605	if ((ipcb->local_port == port) &&
nandgate	0:6dee052a3fa4	606	/* IP address matches, or one is IP_ADDR_ANY? */
nandgate	0:6dee052a3fa4	607	(ip_addr_isany(&(ipcb->local_ip)) \|\|
nandgate	0:6dee052a3fa4	608	ip_addr_isany(ipaddr) \|\|
nandgate	0:6dee052a3fa4	609	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
nandgate	0:6dee052a3fa4	610	/* other PCB already binds to this local IP and port */
nandgate	0:6dee052a3fa4	611	LWIP_DEBUGF(UDP_DEBUG,
nandgate	0:6dee052a3fa4	612	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
nandgate	0:6dee052a3fa4	613	return ERR_USE;
nandgate	0:6dee052a3fa4	614	}
nandgate	0:6dee052a3fa4	615	#endif
nandgate	0:6dee052a3fa4	616	}
nandgate	0:6dee052a3fa4	617
nandgate	0:6dee052a3fa4	618	ip_addr_set(&pcb->local_ip, ipaddr);
nandgate	0:6dee052a3fa4	619
nandgate	0:6dee052a3fa4	620	/* no port specified? */
nandgate	0:6dee052a3fa4	621	if (port == 0) {
nandgate	0:6dee052a3fa4	622	#ifndef UDP_LOCAL_PORT_RANGE_START
nandgate	0:6dee052a3fa4	623	#define UDP_LOCAL_PORT_RANGE_START 4096
nandgate	0:6dee052a3fa4	624	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
nandgate	0:6dee052a3fa4	625	#endif
nandgate	0:6dee052a3fa4	626	port = UDP_LOCAL_PORT_RANGE_START;
nandgate	0:6dee052a3fa4	627	ipcb = udp_pcbs;
nandgate	0:6dee052a3fa4	628	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
nandgate	0:6dee052a3fa4	629	if (ipcb->local_port == port) {
nandgate	0:6dee052a3fa4	630	/* port is already used by another udp_pcb */
nandgate	0:6dee052a3fa4	631	port++;
nandgate	0:6dee052a3fa4	632	/* restart scanning all udp pcbs */
nandgate	0:6dee052a3fa4	633	ipcb = udp_pcbs;
nandgate	0:6dee052a3fa4	634	} else
nandgate	0:6dee052a3fa4	635	/* go on with next udp pcb */
nandgate	0:6dee052a3fa4	636	ipcb = ipcb->next;
nandgate	0:6dee052a3fa4	637	}
nandgate	0:6dee052a3fa4	638	if (ipcb != NULL) {
nandgate	0:6dee052a3fa4	639	/* no more ports available in local range */
nandgate	0:6dee052a3fa4	640	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
nandgate	0:6dee052a3fa4	641	return ERR_USE;
nandgate	0:6dee052a3fa4	642	}
nandgate	0:6dee052a3fa4	643	}
nandgate	0:6dee052a3fa4	644	pcb->local_port = port;
nandgate	0:6dee052a3fa4	645	snmp_insert_udpidx_tree(pcb);
nandgate	0:6dee052a3fa4	646	/* pcb not active yet? */
nandgate	0:6dee052a3fa4	647	if (rebind == 0) {
nandgate	0:6dee052a3fa4	648	/* place the PCB on the active list if not already there */
nandgate	0:6dee052a3fa4	649	pcb->next = udp_pcbs;
nandgate	0:6dee052a3fa4	650	udp_pcbs = pcb;
nandgate	0:6dee052a3fa4	651	}
nandgate	0:6dee052a3fa4	652	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
nandgate	0:6dee052a3fa4	653	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
nandgate	0:6dee052a3fa4	654	(u16_t)((ntohl(pcb->local_ip.addr) >> 24) & 0xff),
nandgate	0:6dee052a3fa4	655	(u16_t)((ntohl(pcb->local_ip.addr) >> 16) & 0xff),
nandgate	0:6dee052a3fa4	656	(u16_t)((ntohl(pcb->local_ip.addr) >> 8) & 0xff),
nandgate	0:6dee052a3fa4	657	(u16_t)(ntohl(pcb->local_ip.addr) & 0xff), pcb->local_port));
nandgate	0:6dee052a3fa4	658	return ERR_OK;
nandgate	0:6dee052a3fa4	659	}
nandgate	0:6dee052a3fa4	660	/**
nandgate	0:6dee052a3fa4	661	* Connect an UDP PCB.
nandgate	0:6dee052a3fa4	662	*
nandgate	0:6dee052a3fa4	663	* This will associate the UDP PCB with the remote address.
nandgate	0:6dee052a3fa4	664	*
nandgate	0:6dee052a3fa4	665	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
nandgate	0:6dee052a3fa4	666	* @param ipaddr remote IP address to connect with.
nandgate	0:6dee052a3fa4	667	* @param port remote UDP port to connect with.
nandgate	0:6dee052a3fa4	668	*
nandgate	0:6dee052a3fa4	669	* @return lwIP error code
nandgate	0:6dee052a3fa4	670	*
nandgate	0:6dee052a3fa4	671	* ipaddr & port are expected to be in the same byte order as in the pcb.
nandgate	0:6dee052a3fa4	672	*
nandgate	0:6dee052a3fa4	673	* The udp pcb is bound to a random local port if not already bound.
nandgate	0:6dee052a3fa4	674	*
nandgate	0:6dee052a3fa4	675	* @see udp_disconnect()
nandgate	0:6dee052a3fa4	676	*/
nandgate	0:6dee052a3fa4	677	err_t
nandgate	0:6dee052a3fa4	678	udp_connect(struct udp_pcb pcb, struct ip_addr ipaddr, u16_t port)
nandgate	0:6dee052a3fa4	679	{
nandgate	0:6dee052a3fa4	680	struct udp_pcb *ipcb;
nandgate	0:6dee052a3fa4	681
nandgate	0:6dee052a3fa4	682	if (pcb->local_port == 0) {
nandgate	0:6dee052a3fa4	683	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
nandgate	0:6dee052a3fa4	684	if (err != ERR_OK)
nandgate	0:6dee052a3fa4	685	return err;
nandgate	0:6dee052a3fa4	686	}
nandgate	0:6dee052a3fa4	687
nandgate	0:6dee052a3fa4	688	ip_addr_set(&pcb->remote_ip, ipaddr);
nandgate	0:6dee052a3fa4	689	pcb->remote_port = port;
nandgate	0:6dee052a3fa4	690	pcb->flags \|= UDP_FLAGS_CONNECTED;
nandgate	0:6dee052a3fa4	691	/** TODO: this functionality belongs in upper layers */
nandgate	0:6dee052a3fa4	692	#ifdef LWIP_UDP_TODO
nandgate	0:6dee052a3fa4	693	/* Nail down local IP for netconn_addr()/getsockname() */
nandgate	0:6dee052a3fa4	694	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
nandgate	0:6dee052a3fa4	695	struct netif *netif;
nandgate	0:6dee052a3fa4	696
nandgate	0:6dee052a3fa4	697	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
nandgate	0:6dee052a3fa4	698	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
nandgate	0:6dee052a3fa4	699	UDP_STATS_INC(udp.rterr);
nandgate	0:6dee052a3fa4	700	return ERR_RTE;
nandgate	0:6dee052a3fa4	701	}
nandgate	0:6dee052a3fa4	702	/** TODO: this will bind the udp pcb locally, to the interface which
nandgate	0:6dee052a3fa4	703	is used to route output packets to the remote address. However, we
nandgate	0:6dee052a3fa4	704	might want to accept incoming packets on any interface! */
nandgate	0:6dee052a3fa4	705	pcb->local_ip = netif->ip_addr;
nandgate	0:6dee052a3fa4	706	} else if (ip_addr_isany(&pcb->remote_ip)) {
nandgate	0:6dee052a3fa4	707	pcb->local_ip.addr = 0;
nandgate	0:6dee052a3fa4	708	}
nandgate	0:6dee052a3fa4	709	#endif
nandgate	0:6dee052a3fa4	710	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
nandgate	0:6dee052a3fa4	711	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
nandgate	0:6dee052a3fa4	712	(u16_t)((ntohl(pcb->remote_ip.addr) >> 24) & 0xff),
nandgate	0:6dee052a3fa4	713	(u16_t)((ntohl(pcb->remote_ip.addr) >> 16) & 0xff),
nandgate	0:6dee052a3fa4	714	(u16_t)((ntohl(pcb->remote_ip.addr) >> 8) & 0xff),
nandgate	0:6dee052a3fa4	715	(u16_t)(ntohl(pcb->remote_ip.addr) & 0xff), pcb->remote_port));
nandgate	0:6dee052a3fa4	716
nandgate	0:6dee052a3fa4	717	/* Insert UDP PCB into the list of active UDP PCBs. */
nandgate	0:6dee052a3fa4	718	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
nandgate	0:6dee052a3fa4	719	if (pcb == ipcb) {
nandgate	0:6dee052a3fa4	720	/* already on the list, just return */
nandgate	0:6dee052a3fa4	721	return ERR_OK;
nandgate	0:6dee052a3fa4	722	}
nandgate	0:6dee052a3fa4	723	}
nandgate	0:6dee052a3fa4	724	/* PCB not yet on the list, add PCB now */
nandgate	0:6dee052a3fa4	725	pcb->next = udp_pcbs;
nandgate	0:6dee052a3fa4	726	udp_pcbs = pcb;
nandgate	0:6dee052a3fa4	727	return ERR_OK;
nandgate	0:6dee052a3fa4	728	}
nandgate	0:6dee052a3fa4	729
nandgate	0:6dee052a3fa4	730	/**
nandgate	0:6dee052a3fa4	731	* Disconnect a UDP PCB
nandgate	0:6dee052a3fa4	732	*
nandgate	0:6dee052a3fa4	733	* @param pcb the udp pcb to disconnect.
nandgate	0:6dee052a3fa4	734	*/
nandgate	0:6dee052a3fa4	735	void
nandgate	0:6dee052a3fa4	736	udp_disconnect(struct udp_pcb *pcb)
nandgate	0:6dee052a3fa4	737	{
nandgate	0:6dee052a3fa4	738	/* reset remote address association */
nandgate	0:6dee052a3fa4	739	ip_addr_set(&pcb->remote_ip, IP_ADDR_ANY);
nandgate	0:6dee052a3fa4	740	pcb->remote_port = 0;
nandgate	0:6dee052a3fa4	741	/* mark PCB as unconnected */
nandgate	0:6dee052a3fa4	742	pcb->flags &= ~UDP_FLAGS_CONNECTED;
nandgate	0:6dee052a3fa4	743	}
nandgate	0:6dee052a3fa4	744
nandgate	0:6dee052a3fa4	745	/**
nandgate	0:6dee052a3fa4	746	* Set a receive callback for a UDP PCB
nandgate	0:6dee052a3fa4	747	*
nandgate	0:6dee052a3fa4	748	* This callback will be called when receiving a datagram for the pcb.
nandgate	0:6dee052a3fa4	749	*
nandgate	0:6dee052a3fa4	750	* @param pcb the pcb for wich to set the recv callback
nandgate	0:6dee052a3fa4	751	* @param recv function pointer of the callback function
nandgate	0:6dee052a3fa4	752	* @param recv_arg additional argument to pass to the callback function
nandgate	0:6dee052a3fa4	753	*/
nandgate	0:6dee052a3fa4	754	void
nandgate	0:6dee052a3fa4	755	udp_recv(struct udp_pcb *pcb,
nandgate	0:6dee052a3fa4	756	void (* recv)(void arg, struct udp_pcb upcb, struct pbuf *p,
nandgate	0:6dee052a3fa4	757	struct ip_addr *addr, u16_t port),
nandgate	0:6dee052a3fa4	758	void *recv_arg)
nandgate	0:6dee052a3fa4	759	{
nandgate	0:6dee052a3fa4	760	/* remember recv() callback and user data */
nandgate	0:6dee052a3fa4	761	pcb->recv = recv;
nandgate	0:6dee052a3fa4	762	pcb->recv_arg = recv_arg;
nandgate	0:6dee052a3fa4	763	}
nandgate	0:6dee052a3fa4	764
nandgate	0:6dee052a3fa4	765	/**
nandgate	0:6dee052a3fa4	766	* Remove an UDP PCB.
nandgate	0:6dee052a3fa4	767	*
nandgate	0:6dee052a3fa4	768	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
nandgate	0:6dee052a3fa4	769	* UDP PCB's and the data structure is freed from memory.
nandgate	0:6dee052a3fa4	770	*
nandgate	0:6dee052a3fa4	771	* @see udp_new()
nandgate	0:6dee052a3fa4	772	*/
nandgate	0:6dee052a3fa4	773	void
nandgate	0:6dee052a3fa4	774	udp_remove(struct udp_pcb *pcb)
nandgate	0:6dee052a3fa4	775	{
nandgate	0:6dee052a3fa4	776	struct udp_pcb *pcb2;
nandgate	0:6dee052a3fa4	777
nandgate	0:6dee052a3fa4	778	snmp_delete_udpidx_tree(pcb);
nandgate	0:6dee052a3fa4	779	/* pcb to be removed is first in list? */
nandgate	0:6dee052a3fa4	780	if (udp_pcbs == pcb) {
nandgate	0:6dee052a3fa4	781	/* make list start at 2nd pcb */
nandgate	0:6dee052a3fa4	782	udp_pcbs = udp_pcbs->next;
nandgate	0:6dee052a3fa4	783	/* pcb not 1st in list */
nandgate	0:6dee052a3fa4	784	} else
nandgate	0:6dee052a3fa4	785	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
nandgate	0:6dee052a3fa4	786	/* find pcb in udp_pcbs list */
nandgate	0:6dee052a3fa4	787	if (pcb2->next != NULL && pcb2->next == pcb) {
nandgate	0:6dee052a3fa4	788	/* remove pcb from list */
nandgate	0:6dee052a3fa4	789	pcb2->next = pcb->next;
nandgate	0:6dee052a3fa4	790	}
nandgate	0:6dee052a3fa4	791	}
nandgate	0:6dee052a3fa4	792	memp_free(MEMP_UDP_PCB, pcb);
nandgate	0:6dee052a3fa4	793	}
nandgate	0:6dee052a3fa4	794
nandgate	0:6dee052a3fa4	795	/**
nandgate	0:6dee052a3fa4	796	* Create a UDP PCB.
nandgate	0:6dee052a3fa4	797	*
nandgate	0:6dee052a3fa4	798	* @return The UDP PCB which was created. NULL if the PCB data structure
nandgate	0:6dee052a3fa4	799	* could not be allocated.
nandgate	0:6dee052a3fa4	800	*
nandgate	0:6dee052a3fa4	801	* @see udp_remove()
nandgate	0:6dee052a3fa4	802	*/
nandgate	0:6dee052a3fa4	803	struct udp_pcb *
nandgate	0:6dee052a3fa4	804	udp_new(void)
nandgate	0:6dee052a3fa4	805	{
nandgate	0:6dee052a3fa4	806	struct udp_pcb *pcb;
nandgate	0:6dee052a3fa4	807	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
nandgate	0:6dee052a3fa4	808	/* could allocate UDP PCB? */
nandgate	0:6dee052a3fa4	809	if (pcb != NULL) {
nandgate	0:6dee052a3fa4	810	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
nandgate	0:6dee052a3fa4	811	* which means checksum is generated over the whole datagram per default
nandgate	0:6dee052a3fa4	812	* (recommended as default by RFC 3828). */
nandgate	0:6dee052a3fa4	813	/* initialize PCB to all zeroes */
nandgate	0:6dee052a3fa4	814	memset(pcb, 0, sizeof(struct udp_pcb));
nandgate	0:6dee052a3fa4	815	pcb->ttl = UDP_TTL;
nandgate	0:6dee052a3fa4	816	}
nandgate	0:6dee052a3fa4	817	return pcb;
nandgate	0:6dee052a3fa4	818	}
nandgate	0:6dee052a3fa4	819
nandgate	0:6dee052a3fa4	820	#if UDP_DEBUG
nandgate	0:6dee052a3fa4	821	/**
nandgate	0:6dee052a3fa4	822	* Print UDP header information for debug purposes.
nandgate	0:6dee052a3fa4	823	*
nandgate	0:6dee052a3fa4	824	* @param udphdr pointer to the udp header in memory.
nandgate	0:6dee052a3fa4	825	*/
nandgate	0:6dee052a3fa4	826	void
nandgate	0:6dee052a3fa4	827	udp_debug_print(struct udp_hdr *udphdr)
nandgate	0:6dee052a3fa4	828	{
nandgate	0:6dee052a3fa4	829	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
nandgate	0:6dee052a3fa4	830	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
nandgate	0:6dee052a3fa4	831	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
nandgate	0:6dee052a3fa4	832	ntohs(udphdr->src), ntohs(udphdr->dest)));
nandgate	0:6dee052a3fa4	833	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
nandgate	0:6dee052a3fa4	834	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
nandgate	0:6dee052a3fa4	835	ntohs(udphdr->len), ntohs(udphdr->chksum)));
nandgate	0:6dee052a3fa4	836	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
nandgate	0:6dee052a3fa4	837	}
nandgate	0:6dee052a3fa4	838	#endif /* UDP_DEBUG */
nandgate	0:6dee052a3fa4	839
nandgate	0:6dee052a3fa4	840	#endif /* LWIP_UDP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	26 Jul 2011
Imports:	159
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	2
Followers:	9

Core/lwIP/core/udp.c@0:6dee052a3fa4, 2011-07-26 (annotated)

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