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lwip/core/udp.c@0:d616ece2d859, 2010-09-18 (annotated)

Committer:: mbed714
Date:: Sat Sep 18 23:05:49 2010 +0000
Revision:: 0:d616ece2d859

Who changed what in which revision?

User	Revision	Line number	New contents of line
mbed714	0:d616ece2d859	1	/**
mbed714	0:d616ece2d859	2	* @file
mbed714	0:d616ece2d859	3	* User Datagram Protocol module
mbed714	0:d616ece2d859	4	*
mbed714	0:d616ece2d859	5	*/
mbed714	0:d616ece2d859	6
mbed714	0:d616ece2d859	7	/*
mbed714	0:d616ece2d859	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed714	0:d616ece2d859	9	* All rights reserved.
mbed714	0:d616ece2d859	10	*
mbed714	0:d616ece2d859	11	* Redistribution and use in source and binary forms, with or without modification,
mbed714	0:d616ece2d859	12	* are permitted provided that the following conditions are met:
mbed714	0:d616ece2d859	13	*
mbed714	0:d616ece2d859	14	* 1. Redistributions of source code must retain the above copyright notice,
mbed714	0:d616ece2d859	15	* this list of conditions and the following disclaimer.
mbed714	0:d616ece2d859	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
mbed714	0:d616ece2d859	17	* this list of conditions and the following disclaimer in the documentation
mbed714	0:d616ece2d859	18	* and/or other materials provided with the distribution.
mbed714	0:d616ece2d859	19	* 3. The name of the author may not be used to endorse or promote products
mbed714	0:d616ece2d859	20	* derived from this software without specific prior written permission.
mbed714	0:d616ece2d859	21	*
mbed714	0:d616ece2d859	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed714	0:d616ece2d859	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed714	0:d616ece2d859	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed714	0:d616ece2d859	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed714	0:d616ece2d859	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed714	0:d616ece2d859	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed714	0:d616ece2d859	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed714	0:d616ece2d859	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed714	0:d616ece2d859	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed714	0:d616ece2d859	31	* OF SUCH DAMAGE.
mbed714	0:d616ece2d859	32	*
mbed714	0:d616ece2d859	33	* This file is part of the lwIP TCP/IP stack.
mbed714	0:d616ece2d859	34	*
mbed714	0:d616ece2d859	35	* Author: Adam Dunkels <adam@sics.se>
mbed714	0:d616ece2d859	36	*
mbed714	0:d616ece2d859	37	*/
mbed714	0:d616ece2d859	38
mbed714	0:d616ece2d859	39
mbed714	0:d616ece2d859	40	/* udp.c
mbed714	0:d616ece2d859	41	*
mbed714	0:d616ece2d859	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
mbed714	0:d616ece2d859	43	*
mbed714	0:d616ece2d859	44	*/
mbed714	0:d616ece2d859	45
mbed714	0:d616ece2d859	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
mbed714	0:d616ece2d859	47	*/
mbed714	0:d616ece2d859	48
mbed714	0:d616ece2d859	49	#include "lwip/opt.h"
mbed714	0:d616ece2d859	50
mbed714	0:d616ece2d859	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
mbed714	0:d616ece2d859	52
mbed714	0:d616ece2d859	53	#include "lwip/udp.h"
mbed714	0:d616ece2d859	54	#include "lwip/def.h"
mbed714	0:d616ece2d859	55	#include "lwip/memp.h"
mbed714	0:d616ece2d859	56	#include "lwip/inet_chksum.h"
mbed714	0:d616ece2d859	57	#include "lwip/ip_addr.h"
mbed714	0:d616ece2d859	58	#include "lwip/netif.h"
mbed714	0:d616ece2d859	59	#include "lwip/icmp.h"
mbed714	0:d616ece2d859	60	#include "lwip/stats.h"
mbed714	0:d616ece2d859	61	#include "lwip/snmp.h"
mbed714	0:d616ece2d859	62	#include "arch/perf.h"
mbed714	0:d616ece2d859	63	#include "lwip/dhcp.h"
mbed714	0:d616ece2d859	64
mbed714	0:d616ece2d859	65	#include <string.h>
mbed714	0:d616ece2d859	66
mbed714	0:d616ece2d859	67	/* The list of UDP PCBs */
mbed714	0:d616ece2d859	68	/* exported in udp.h (was static) */
mbed714	0:d616ece2d859	69	struct udp_pcb *udp_pcbs;
mbed714	0:d616ece2d859	70
mbed714	0:d616ece2d859	71	/**
mbed714	0:d616ece2d859	72	* Process an incoming UDP datagram.
mbed714	0:d616ece2d859	73	*
mbed714	0:d616ece2d859	74	* Given an incoming UDP datagram (as a chain of pbufs) this function
mbed714	0:d616ece2d859	75	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
mbed714	0:d616ece2d859	76	* recv function. If no pcb is found or the datagram is incorrect, the
mbed714	0:d616ece2d859	77	* pbuf is freed.
mbed714	0:d616ece2d859	78	*
mbed714	0:d616ece2d859	79	* @param p pbuf to be demultiplexed to a UDP PCB.
mbed714	0:d616ece2d859	80	* @param inp network interface on which the datagram was received.
mbed714	0:d616ece2d859	81	*
mbed714	0:d616ece2d859	82	*/
mbed714	0:d616ece2d859	83	void
mbed714	0:d616ece2d859	84	udp_input(struct pbuf p, struct netif inp)
mbed714	0:d616ece2d859	85	{
mbed714	0:d616ece2d859	86	struct udp_hdr *udphdr;
mbed714	0:d616ece2d859	87	struct udp_pcb pcb, prev;
mbed714	0:d616ece2d859	88	struct udp_pcb *uncon_pcb;
mbed714	0:d616ece2d859	89	struct ip_hdr *iphdr;
mbed714	0:d616ece2d859	90	u16_t src, dest;
mbed714	0:d616ece2d859	91	u8_t local_match;
mbed714	0:d616ece2d859	92	u8_t broadcast;
mbed714	0:d616ece2d859	93
mbed714	0:d616ece2d859	94	PERF_START;
mbed714	0:d616ece2d859	95
mbed714	0:d616ece2d859	96	UDP_STATS_INC(udp.recv);
mbed714	0:d616ece2d859	97
mbed714	0:d616ece2d859	98	iphdr = (struct ip_hdr *)p->payload;
mbed714	0:d616ece2d859	99
mbed714	0:d616ece2d859	100	/* Check minimum length (IP header + UDP header)
mbed714	0:d616ece2d859	101	* and move payload pointer to UDP header */
mbed714	0:d616ece2d859	102	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
mbed714	0:d616ece2d859	103	/* drop short packets */
mbed714	0:d616ece2d859	104	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:d616ece2d859	105	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
mbed714	0:d616ece2d859	106	UDP_STATS_INC(udp.lenerr);
mbed714	0:d616ece2d859	107	UDP_STATS_INC(udp.drop);
mbed714	0:d616ece2d859	108	snmp_inc_udpinerrors();
mbed714	0:d616ece2d859	109	pbuf_free(p);
mbed714	0:d616ece2d859	110	goto end;
mbed714	0:d616ece2d859	111	}
mbed714	0:d616ece2d859	112
mbed714	0:d616ece2d859	113	udphdr = (struct udp_hdr *)p->payload;
mbed714	0:d616ece2d859	114
mbed714	0:d616ece2d859	115	/* is broadcast packet ? */
mbed714	0:d616ece2d859	116	broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
mbed714	0:d616ece2d859	117
mbed714	0:d616ece2d859	118	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
mbed714	0:d616ece2d859	119
mbed714	0:d616ece2d859	120	/* convert src and dest ports to host byte order */
mbed714	0:d616ece2d859	121	src = ntohs(udphdr->src);
mbed714	0:d616ece2d859	122	dest = ntohs(udphdr->dest);
mbed714	0:d616ece2d859	123
mbed714	0:d616ece2d859	124	udp_debug_print(udphdr);
mbed714	0:d616ece2d859	125
mbed714	0:d616ece2d859	126	/* print the UDP source and destination */
mbed714	0:d616ece2d859	127	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:d616ece2d859	128	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
mbed714	0:d616ece2d859	129	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
mbed714	0:d616ece2d859	130	ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
mbed714	0:d616ece2d859	131	ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
mbed714	0:d616ece2d859	132	ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
mbed714	0:d616ece2d859	133	ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
mbed714	0:d616ece2d859	134
mbed714	0:d616ece2d859	135	#if LWIP_DHCP
mbed714	0:d616ece2d859	136	pcb = NULL;
mbed714	0:d616ece2d859	137	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
mbed714	0:d616ece2d859	138	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
mbed714	0:d616ece2d859	139	if (dest == DHCP_CLIENT_PORT) {
mbed714	0:d616ece2d859	140	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
mbed714	0:d616ece2d859	141	if (src == DHCP_SERVER_PORT) {
mbed714	0:d616ece2d859	142	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
mbed714	0:d616ece2d859	143	/* accept the packe if
mbed714	0:d616ece2d859	144	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
mbed714	0:d616ece2d859	145	- inp->dhcp->pcb->remote == ANY or iphdr->src */
mbed714	0:d616ece2d859	146	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
mbed714	0:d616ece2d859	147	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
mbed714	0:d616ece2d859	148	pcb = inp->dhcp->pcb;
mbed714	0:d616ece2d859	149	}
mbed714	0:d616ece2d859	150	}
mbed714	0:d616ece2d859	151	}
mbed714	0:d616ece2d859	152	} else
mbed714	0:d616ece2d859	153	#endif /* LWIP_DHCP */
mbed714	0:d616ece2d859	154	{
mbed714	0:d616ece2d859	155	prev = NULL;
mbed714	0:d616ece2d859	156	local_match = 0;
mbed714	0:d616ece2d859	157	uncon_pcb = NULL;
mbed714	0:d616ece2d859	158	/* Iterate through the UDP pcb list for a matching pcb.
mbed714	0:d616ece2d859	159	* 'Perfect match' pcbs (connected to the remote port & ip address) are
mbed714	0:d616ece2d859	160	* preferred. If no perfect match is found, the first unconnected pcb that
mbed714	0:d616ece2d859	161	* matches the local port and ip address gets the datagram. */
mbed714	0:d616ece2d859	162	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:d616ece2d859	163	local_match = 0;
mbed714	0:d616ece2d859	164	/* print the PCB local and remote address */
mbed714	0:d616ece2d859	165	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:d616ece2d859	166	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
mbed714	0:d616ece2d859	167	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
mbed714	0:d616ece2d859	168	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed714	0:d616ece2d859	169	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
mbed714	0:d616ece2d859	170	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
mbed714	0:d616ece2d859	171	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
mbed714	0:d616ece2d859	172
mbed714	0:d616ece2d859	173	/* compare PCB local addr+port to UDP destination addr+port */
mbed714	0:d616ece2d859	174	if ((pcb->local_port == dest) &&
mbed714	0:d616ece2d859	175	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
mbed714	0:d616ece2d859	176	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) \|\|
mbed714	0:d616ece2d859	177	#if LWIP_IGMP
mbed714	0:d616ece2d859	178	ip_addr_ismulticast(&current_iphdr_dest) \|\|
mbed714	0:d616ece2d859	179	#endif /* LWIP_IGMP */
mbed714	0:d616ece2d859	180	#if IP_SOF_BROADCAST_RECV
mbed714	0:d616ece2d859	181	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
mbed714	0:d616ece2d859	182	#else /* IP_SOF_BROADCAST_RECV */
mbed714	0:d616ece2d859	183	(broadcast))) {
mbed714	0:d616ece2d859	184	#endif /* IP_SOF_BROADCAST_RECV */
mbed714	0:d616ece2d859	185	local_match = 1;
mbed714	0:d616ece2d859	186	if ((uncon_pcb == NULL) &&
mbed714	0:d616ece2d859	187	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
mbed714	0:d616ece2d859	188	/* the first unconnected matching PCB */
mbed714	0:d616ece2d859	189	uncon_pcb = pcb;
mbed714	0:d616ece2d859	190	}
mbed714	0:d616ece2d859	191	}
mbed714	0:d616ece2d859	192	/* compare PCB remote addr+port to UDP source addr+port */
mbed714	0:d616ece2d859	193	if ((local_match != 0) &&
mbed714	0:d616ece2d859	194	(pcb->remote_port == src) &&
mbed714	0:d616ece2d859	195	(ip_addr_isany(&pcb->remote_ip) \|\|
mbed714	0:d616ece2d859	196	ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
mbed714	0:d616ece2d859	197	/* the first fully matching PCB */
mbed714	0:d616ece2d859	198	if (prev != NULL) {
mbed714	0:d616ece2d859	199	/* move the pcb to the front of udp_pcbs so that is
mbed714	0:d616ece2d859	200	found faster next time */
mbed714	0:d616ece2d859	201	prev->next = pcb->next;
mbed714	0:d616ece2d859	202	pcb->next = udp_pcbs;
mbed714	0:d616ece2d859	203	udp_pcbs = pcb;
mbed714	0:d616ece2d859	204	} else {
mbed714	0:d616ece2d859	205	UDP_STATS_INC(udp.cachehit);
mbed714	0:d616ece2d859	206	}
mbed714	0:d616ece2d859	207	break;
mbed714	0:d616ece2d859	208	}
mbed714	0:d616ece2d859	209	prev = pcb;
mbed714	0:d616ece2d859	210	}
mbed714	0:d616ece2d859	211	/* no fully matching pcb found? then look for an unconnected pcb */
mbed714	0:d616ece2d859	212	if (pcb == NULL) {
mbed714	0:d616ece2d859	213	pcb = uncon_pcb;
mbed714	0:d616ece2d859	214	}
mbed714	0:d616ece2d859	215	}
mbed714	0:d616ece2d859	216
mbed714	0:d616ece2d859	217	/* Check checksum if this is a match or if it was directed at us. */
mbed714	0:d616ece2d859	218	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
mbed714	0:d616ece2d859	219	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
mbed714	0:d616ece2d859	220	#if LWIP_UDPLITE
mbed714	0:d616ece2d859	221	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
mbed714	0:d616ece2d859	222	/* Do the UDP Lite checksum */
mbed714	0:d616ece2d859	223	#if CHECKSUM_CHECK_UDP
mbed714	0:d616ece2d859	224	u16_t chklen = ntohs(udphdr->len);
mbed714	0:d616ece2d859	225	if (chklen < sizeof(struct udp_hdr)) {
mbed714	0:d616ece2d859	226	if (chklen == 0) {
mbed714	0:d616ece2d859	227	/* For UDP-Lite, checksum length of 0 means checksum
mbed714	0:d616ece2d859	228	over the complete packet (See RFC 3828 chap. 3.1) */
mbed714	0:d616ece2d859	229	chklen = p->tot_len;
mbed714	0:d616ece2d859	230	} else {
mbed714	0:d616ece2d859	231	/* At least the UDP-Lite header must be covered by the
mbed714	0:d616ece2d859	232	checksum! (Again, see RFC 3828 chap. 3.1) */
mbed714	0:d616ece2d859	233	UDP_STATS_INC(udp.chkerr);
mbed714	0:d616ece2d859	234	UDP_STATS_INC(udp.drop);
mbed714	0:d616ece2d859	235	snmp_inc_udpinerrors();
mbed714	0:d616ece2d859	236	pbuf_free(p);
mbed714	0:d616ece2d859	237	goto end;
mbed714	0:d616ece2d859	238	}
mbed714	0:d616ece2d859	239	}
mbed714	0:d616ece2d859	240	if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
mbed714	0:d616ece2d859	241	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
mbed714	0:d616ece2d859	242	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	243	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
mbed714	0:d616ece2d859	244	UDP_STATS_INC(udp.chkerr);
mbed714	0:d616ece2d859	245	UDP_STATS_INC(udp.drop);
mbed714	0:d616ece2d859	246	snmp_inc_udpinerrors();
mbed714	0:d616ece2d859	247	pbuf_free(p);
mbed714	0:d616ece2d859	248	goto end;
mbed714	0:d616ece2d859	249	}
mbed714	0:d616ece2d859	250	#endif /* CHECKSUM_CHECK_UDP */
mbed714	0:d616ece2d859	251	} else
mbed714	0:d616ece2d859	252	#endif /* LWIP_UDPLITE */
mbed714	0:d616ece2d859	253	{
mbed714	0:d616ece2d859	254	#if CHECKSUM_CHECK_UDP
mbed714	0:d616ece2d859	255	if (udphdr->chksum != 0) {
mbed714	0:d616ece2d859	256	if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
mbed714	0:d616ece2d859	257	IP_PROTO_UDP, p->tot_len) != 0) {
mbed714	0:d616ece2d859	258	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	259	("udp_input: UDP datagram discarded due to failing checksum\n"));
mbed714	0:d616ece2d859	260	UDP_STATS_INC(udp.chkerr);
mbed714	0:d616ece2d859	261	UDP_STATS_INC(udp.drop);
mbed714	0:d616ece2d859	262	snmp_inc_udpinerrors();
mbed714	0:d616ece2d859	263	pbuf_free(p);
mbed714	0:d616ece2d859	264	goto end;
mbed714	0:d616ece2d859	265	}
mbed714	0:d616ece2d859	266	}
mbed714	0:d616ece2d859	267	#endif /* CHECKSUM_CHECK_UDP */
mbed714	0:d616ece2d859	268	}
mbed714	0:d616ece2d859	269	if(pbuf_header(p, -UDP_HLEN)) {
mbed714	0:d616ece2d859	270	/* Can we cope with this failing? Just assert for now */
mbed714	0:d616ece2d859	271	LWIP_ASSERT("pbuf_header failed\n", 0);
mbed714	0:d616ece2d859	272	UDP_STATS_INC(udp.drop);
mbed714	0:d616ece2d859	273	snmp_inc_udpinerrors();
mbed714	0:d616ece2d859	274	pbuf_free(p);
mbed714	0:d616ece2d859	275	goto end;
mbed714	0:d616ece2d859	276	}
mbed714	0:d616ece2d859	277	if (pcb != NULL) {
mbed714	0:d616ece2d859	278	snmp_inc_udpindatagrams();
mbed714	0:d616ece2d859	279	#if SO_REUSE && SO_REUSE_RXTOALL
mbed714	0:d616ece2d859	280	if ((broadcast \|\| ip_addr_ismulticast(&current_iphdr_dest)) &&
mbed714	0:d616ece2d859	281	((pcb->so_options & SOF_REUSEADDR) != 0)) {
mbed714	0:d616ece2d859	282	/* pass broadcast- or multicast packets to all multicast pcbs
mbed714	0:d616ece2d859	283	if SOF_REUSEADDR is set on the first match */
mbed714	0:d616ece2d859	284	struct udp_pcb *mpcb;
mbed714	0:d616ece2d859	285	u8_t p_header_changed = 0;
mbed714	0:d616ece2d859	286	for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
mbed714	0:d616ece2d859	287	if (mpcb != pcb) {
mbed714	0:d616ece2d859	288	/* compare PCB local addr+port to UDP destination addr+port */
mbed714	0:d616ece2d859	289	if ((mpcb->local_port == dest) &&
mbed714	0:d616ece2d859	290	((!broadcast && ip_addr_isany(&mpcb->local_ip)) \|\|
mbed714	0:d616ece2d859	291	ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) \|\|
mbed714	0:d616ece2d859	292	#if LWIP_IGMP
mbed714	0:d616ece2d859	293	ip_addr_ismulticast(&current_iphdr_dest) \|\|
mbed714	0:d616ece2d859	294	#endif /* LWIP_IGMP */
mbed714	0:d616ece2d859	295	#if IP_SOF_BROADCAST_RECV
mbed714	0:d616ece2d859	296	(broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
mbed714	0:d616ece2d859	297	#else /* IP_SOF_BROADCAST_RECV */
mbed714	0:d616ece2d859	298	(broadcast))) {
mbed714	0:d616ece2d859	299	#endif /* IP_SOF_BROADCAST_RECV */
mbed714	0:d616ece2d859	300	/* pass a copy of the packet to all local matches */
mbed714	0:d616ece2d859	301	if (mpcb->recv != NULL) {
mbed714	0:d616ece2d859	302	struct pbuf *q;
mbed714	0:d616ece2d859	303	/* for that, move payload to IP header again */
mbed714	0:d616ece2d859	304	if (p_header_changed == 0) {
mbed714	0:d616ece2d859	305	pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed714	0:d616ece2d859	306	p_header_changed = 1;
mbed714	0:d616ece2d859	307	}
mbed714	0:d616ece2d859	308	q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
mbed714	0:d616ece2d859	309	if (q != NULL) {
mbed714	0:d616ece2d859	310	err_t err = pbuf_copy(q, p);
mbed714	0:d616ece2d859	311	if (err == ERR_OK) {
mbed714	0:d616ece2d859	312	/* move payload to UDP data */
mbed714	0:d616ece2d859	313	pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed714	0:d616ece2d859	314	mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
mbed714	0:d616ece2d859	315	}
mbed714	0:d616ece2d859	316	}
mbed714	0:d616ece2d859	317	}
mbed714	0:d616ece2d859	318	}
mbed714	0:d616ece2d859	319	}
mbed714	0:d616ece2d859	320	}
mbed714	0:d616ece2d859	321	if (p_header_changed) {
mbed714	0:d616ece2d859	322	/* and move payload to UDP data again */
mbed714	0:d616ece2d859	323	pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed714	0:d616ece2d859	324	}
mbed714	0:d616ece2d859	325	}
mbed714	0:d616ece2d859	326	#endif /* SO_REUSE && SO_REUSE_RXTOALL */
mbed714	0:d616ece2d859	327	/* callback */
mbed714	0:d616ece2d859	328	if (pcb->recv != NULL) {
mbed714	0:d616ece2d859	329	/* now the recv function is responsible for freeing p */
mbed714	0:d616ece2d859	330	pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
mbed714	0:d616ece2d859	331	} else {
mbed714	0:d616ece2d859	332	/* no recv function registered? then we have to free the pbuf! */
mbed714	0:d616ece2d859	333	pbuf_free(p);
mbed714	0:d616ece2d859	334	goto end;
mbed714	0:d616ece2d859	335	}
mbed714	0:d616ece2d859	336	} else {
mbed714	0:d616ece2d859	337	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
mbed714	0:d616ece2d859	338
mbed714	0:d616ece2d859	339	#if LWIP_ICMP
mbed714	0:d616ece2d859	340	/* No match was found, send ICMP destination port unreachable unless
mbed714	0:d616ece2d859	341	destination address was broadcast/multicast. */
mbed714	0:d616ece2d859	342	if (!broadcast &&
mbed714	0:d616ece2d859	343	!ip_addr_ismulticast(&current_iphdr_dest)) {
mbed714	0:d616ece2d859	344	/* move payload pointer back to ip header */
mbed714	0:d616ece2d859	345	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
mbed714	0:d616ece2d859	346	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
mbed714	0:d616ece2d859	347	icmp_dest_unreach(p, ICMP_DUR_PORT);
mbed714	0:d616ece2d859	348	}
mbed714	0:d616ece2d859	349	#endif /* LWIP_ICMP */
mbed714	0:d616ece2d859	350	UDP_STATS_INC(udp.proterr);
mbed714	0:d616ece2d859	351	UDP_STATS_INC(udp.drop);
mbed714	0:d616ece2d859	352	snmp_inc_udpnoports();
mbed714	0:d616ece2d859	353	pbuf_free(p);
mbed714	0:d616ece2d859	354	}
mbed714	0:d616ece2d859	355	} else {
mbed714	0:d616ece2d859	356	pbuf_free(p);
mbed714	0:d616ece2d859	357	}
mbed714	0:d616ece2d859	358	end:
mbed714	0:d616ece2d859	359	PERF_STOP("udp_input");
mbed714	0:d616ece2d859	360	}
mbed714	0:d616ece2d859	361
mbed714	0:d616ece2d859	362	/**
mbed714	0:d616ece2d859	363	* Send data using UDP.
mbed714	0:d616ece2d859	364	*
mbed714	0:d616ece2d859	365	* @param pcb UDP PCB used to send the data.
mbed714	0:d616ece2d859	366	* @param p chain of pbuf's to be sent.
mbed714	0:d616ece2d859	367	*
mbed714	0:d616ece2d859	368	* The datagram will be sent to the current remote_ip & remote_port
mbed714	0:d616ece2d859	369	* stored in pcb. If the pcb is not bound to a port, it will
mbed714	0:d616ece2d859	370	* automatically be bound to a random port.
mbed714	0:d616ece2d859	371	*
mbed714	0:d616ece2d859	372	* @return lwIP error code.
mbed714	0:d616ece2d859	373	* - ERR_OK. Successful. No error occured.
mbed714	0:d616ece2d859	374	* - ERR_MEM. Out of memory.
mbed714	0:d616ece2d859	375	* - ERR_RTE. Could not find route to destination address.
mbed714	0:d616ece2d859	376	* - More errors could be returned by lower protocol layers.
mbed714	0:d616ece2d859	377	*
mbed714	0:d616ece2d859	378	* @see udp_disconnect() udp_sendto()
mbed714	0:d616ece2d859	379	*/
mbed714	0:d616ece2d859	380	err_t
mbed714	0:d616ece2d859	381	udp_send(struct udp_pcb pcb, struct pbuf p)
mbed714	0:d616ece2d859	382	{
mbed714	0:d616ece2d859	383	/* send to the packet using remote ip and port stored in the pcb */
mbed714	0:d616ece2d859	384	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
mbed714	0:d616ece2d859	385	}
mbed714	0:d616ece2d859	386
mbed714	0:d616ece2d859	387	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:d616ece2d859	388	/** Same as udp_send() but with checksum
mbed714	0:d616ece2d859	389	*/
mbed714	0:d616ece2d859	390	err_t
mbed714	0:d616ece2d859	391	udp_send_chksum(struct udp_pcb pcb, struct pbuf p,
mbed714	0:d616ece2d859	392	u8_t have_chksum, u16_t chksum)
mbed714	0:d616ece2d859	393	{
mbed714	0:d616ece2d859	394	/* send to the packet using remote ip and port stored in the pcb */
mbed714	0:d616ece2d859	395	return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
mbed714	0:d616ece2d859	396	have_chksum, chksum);
mbed714	0:d616ece2d859	397	}
mbed714	0:d616ece2d859	398	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:d616ece2d859	399
mbed714	0:d616ece2d859	400	/**
mbed714	0:d616ece2d859	401	* Send data to a specified address using UDP.
mbed714	0:d616ece2d859	402	*
mbed714	0:d616ece2d859	403	* @param pcb UDP PCB used to send the data.
mbed714	0:d616ece2d859	404	* @param p chain of pbuf's to be sent.
mbed714	0:d616ece2d859	405	* @param dst_ip Destination IP address.
mbed714	0:d616ece2d859	406	* @param dst_port Destination UDP port.
mbed714	0:d616ece2d859	407	*
mbed714	0:d616ece2d859	408	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
mbed714	0:d616ece2d859	409	*
mbed714	0:d616ece2d859	410	* If the PCB already has a remote address association, it will
mbed714	0:d616ece2d859	411	* be restored after the data is sent.
mbed714	0:d616ece2d859	412	*
mbed714	0:d616ece2d859	413	* @return lwIP error code (@see udp_send for possible error codes)
mbed714	0:d616ece2d859	414	*
mbed714	0:d616ece2d859	415	* @see udp_disconnect() udp_send()
mbed714	0:d616ece2d859	416	*/
mbed714	0:d616ece2d859	417	err_t
mbed714	0:d616ece2d859	418	udp_sendto(struct udp_pcb pcb, struct pbuf p,
mbed714	0:d616ece2d859	419	ip_addr_t *dst_ip, u16_t dst_port)
mbed714	0:d616ece2d859	420	{
mbed714	0:d616ece2d859	421	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:d616ece2d859	422	return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
mbed714	0:d616ece2d859	423	}
mbed714	0:d616ece2d859	424
mbed714	0:d616ece2d859	425	/** Same as udp_sendto(), but with checksum */
mbed714	0:d616ece2d859	426	err_t
mbed714	0:d616ece2d859	427	udp_sendto_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
mbed714	0:d616ece2d859	428	u16_t dst_port, u8_t have_chksum, u16_t chksum)
mbed714	0:d616ece2d859	429	{
mbed714	0:d616ece2d859	430	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:d616ece2d859	431	struct netif *netif;
mbed714	0:d616ece2d859	432
mbed714	0:d616ece2d859	433	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send\n"));
mbed714	0:d616ece2d859	434
mbed714	0:d616ece2d859	435	/* find the outgoing network interface for this packet */
mbed714	0:d616ece2d859	436	#if LWIP_IGMP
mbed714	0:d616ece2d859	437	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
mbed714	0:d616ece2d859	438	#else
mbed714	0:d616ece2d859	439	netif = ip_route(dst_ip);
mbed714	0:d616ece2d859	440	#endif /* LWIP_IGMP */
mbed714	0:d616ece2d859	441
mbed714	0:d616ece2d859	442	/* no outgoing network interface could be found? */
mbed714	0:d616ece2d859	443	if (netif == NULL) {
mbed714	0:d616ece2d859	444	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed714	0:d616ece2d859	445	ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
mbed714	0:d616ece2d859	446	UDP_STATS_INC(udp.rterr);
mbed714	0:d616ece2d859	447	return ERR_RTE;
mbed714	0:d616ece2d859	448	}
mbed714	0:d616ece2d859	449	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:d616ece2d859	450	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
mbed714	0:d616ece2d859	451	#else /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:d616ece2d859	452	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
mbed714	0:d616ece2d859	453	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:d616ece2d859	454	}
mbed714	0:d616ece2d859	455
mbed714	0:d616ece2d859	456	/**
mbed714	0:d616ece2d859	457	* Send data to a specified address using UDP.
mbed714	0:d616ece2d859	458	* The netif used for sending can be specified.
mbed714	0:d616ece2d859	459	*
mbed714	0:d616ece2d859	460	* This function exists mainly for DHCP, to be able to send UDP packets
mbed714	0:d616ece2d859	461	* on a netif that is still down.
mbed714	0:d616ece2d859	462	*
mbed714	0:d616ece2d859	463	* @param pcb UDP PCB used to send the data.
mbed714	0:d616ece2d859	464	* @param p chain of pbuf's to be sent.
mbed714	0:d616ece2d859	465	* @param dst_ip Destination IP address.
mbed714	0:d616ece2d859	466	* @param dst_port Destination UDP port.
mbed714	0:d616ece2d859	467	* @param netif the netif used for sending.
mbed714	0:d616ece2d859	468	*
mbed714	0:d616ece2d859	469	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
mbed714	0:d616ece2d859	470	*
mbed714	0:d616ece2d859	471	* @return lwIP error code (@see udp_send for possible error codes)
mbed714	0:d616ece2d859	472	*
mbed714	0:d616ece2d859	473	* @see udp_disconnect() udp_send()
mbed714	0:d616ece2d859	474	*/
mbed714	0:d616ece2d859	475	err_t
mbed714	0:d616ece2d859	476	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
mbed714	0:d616ece2d859	477	ip_addr_t dst_ip, u16_t dst_port, struct netif netif)
mbed714	0:d616ece2d859	478	{
mbed714	0:d616ece2d859	479	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:d616ece2d859	480	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
mbed714	0:d616ece2d859	481	}
mbed714	0:d616ece2d859	482
mbed714	0:d616ece2d859	483	/** Same as udp_sendto_if(), but with checksum */
mbed714	0:d616ece2d859	484	err_t
mbed714	0:d616ece2d859	485	udp_sendto_if_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
mbed714	0:d616ece2d859	486	u16_t dst_port, struct netif *netif, u8_t have_chksum,
mbed714	0:d616ece2d859	487	u16_t chksum)
mbed714	0:d616ece2d859	488	{
mbed714	0:d616ece2d859	489	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:d616ece2d859	490	struct udp_hdr *udphdr;
mbed714	0:d616ece2d859	491	ip_addr_t *src_ip;
mbed714	0:d616ece2d859	492	err_t err;
mbed714	0:d616ece2d859	493	struct pbuf q; / q will be sent down the stack */
mbed714	0:d616ece2d859	494
mbed714	0:d616ece2d859	495	#if IP_SOF_BROADCAST
mbed714	0:d616ece2d859	496	/* broadcast filter? */
mbed714	0:d616ece2d859	497	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
mbed714	0:d616ece2d859	498	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	499	("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
mbed714	0:d616ece2d859	500	return ERR_VAL;
mbed714	0:d616ece2d859	501	}
mbed714	0:d616ece2d859	502	#endif /* IP_SOF_BROADCAST */
mbed714	0:d616ece2d859	503
mbed714	0:d616ece2d859	504	/* if the PCB is not yet bound to a port, bind it here */
mbed714	0:d616ece2d859	505	if (pcb->local_port == 0) {
mbed714	0:d616ece2d859	506	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
mbed714	0:d616ece2d859	507	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
mbed714	0:d616ece2d859	508	if (err != ERR_OK) {
mbed714	0:d616ece2d859	509	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
mbed714	0:d616ece2d859	510	return err;
mbed714	0:d616ece2d859	511	}
mbed714	0:d616ece2d859	512	}
mbed714	0:d616ece2d859	513
mbed714	0:d616ece2d859	514	/* not enough space to add an UDP header to first pbuf in given p chain? */
mbed714	0:d616ece2d859	515	if (pbuf_header(p, UDP_HLEN)) {
mbed714	0:d616ece2d859	516	/* allocate header in a separate new pbuf */
mbed714	0:d616ece2d859	517	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
mbed714	0:d616ece2d859	518	/* new header pbuf could not be allocated? */
mbed714	0:d616ece2d859	519	if (q == NULL) {
mbed714	0:d616ece2d859	520	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
mbed714	0:d616ece2d859	521	return ERR_MEM;
mbed714	0:d616ece2d859	522	}
mbed714	0:d616ece2d859	523	/* chain header q in front of given pbuf p */
mbed714	0:d616ece2d859	524	pbuf_chain(q, p);
mbed714	0:d616ece2d859	525	/* first pbuf q points to header pbuf */
mbed714	0:d616ece2d859	526	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:d616ece2d859	527	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
mbed714	0:d616ece2d859	528	} else {
mbed714	0:d616ece2d859	529	/* adding space for header within p succeeded */
mbed714	0:d616ece2d859	530	/* first pbuf q equals given pbuf */
mbed714	0:d616ece2d859	531	q = p;
mbed714	0:d616ece2d859	532	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
mbed714	0:d616ece2d859	533	}
mbed714	0:d616ece2d859	534	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
mbed714	0:d616ece2d859	535	(q->len >= sizeof(struct udp_hdr)));
mbed714	0:d616ece2d859	536	/* q now represents the packet to be sent */
mbed714	0:d616ece2d859	537	udphdr = (struct udp_hdr *)q->payload;
mbed714	0:d616ece2d859	538	udphdr->src = htons(pcb->local_port);
mbed714	0:d616ece2d859	539	udphdr->dest = htons(dst_port);
mbed714	0:d616ece2d859	540	/* in UDP, 0 checksum means 'no checksum' */
mbed714	0:d616ece2d859	541	udphdr->chksum = 0x0000;
mbed714	0:d616ece2d859	542
mbed714	0:d616ece2d859	543	/* Multicast Loop? */
mbed714	0:d616ece2d859	544	#if LWIP_IGMP
mbed714	0:d616ece2d859	545	if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
mbed714	0:d616ece2d859	546	q->flags \|= PBUF_FLAG_MCASTLOOP;
mbed714	0:d616ece2d859	547	}
mbed714	0:d616ece2d859	548	#endif /* LWIP_IGMP */
mbed714	0:d616ece2d859	549
mbed714	0:d616ece2d859	550
mbed714	0:d616ece2d859	551	/* PCB local address is IP_ANY_ADDR? */
mbed714	0:d616ece2d859	552	if (ip_addr_isany(&pcb->local_ip)) {
mbed714	0:d616ece2d859	553	/* use outgoing network interface IP address as source address */
mbed714	0:d616ece2d859	554	src_ip = &(netif->ip_addr);
mbed714	0:d616ece2d859	555	} else {
mbed714	0:d616ece2d859	556	/* check if UDP PCB local IP address is correct
mbed714	0:d616ece2d859	557	* this could be an old address if netif->ip_addr has changed */
mbed714	0:d616ece2d859	558	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
mbed714	0:d616ece2d859	559	/* local_ip doesn't match, drop the packet */
mbed714	0:d616ece2d859	560	if (q != p) {
mbed714	0:d616ece2d859	561	/* free the header pbuf */
mbed714	0:d616ece2d859	562	pbuf_free(q);
mbed714	0:d616ece2d859	563	q = NULL;
mbed714	0:d616ece2d859	564	/* p is still referenced by the caller, and will live on */
mbed714	0:d616ece2d859	565	}
mbed714	0:d616ece2d859	566	return ERR_VAL;
mbed714	0:d616ece2d859	567	}
mbed714	0:d616ece2d859	568	/* use UDP PCB local IP address as source address */
mbed714	0:d616ece2d859	569	src_ip = &(pcb->local_ip);
mbed714	0:d616ece2d859	570	}
mbed714	0:d616ece2d859	571
mbed714	0:d616ece2d859	572	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
mbed714	0:d616ece2d859	573
mbed714	0:d616ece2d859	574	#if LWIP_UDPLITE
mbed714	0:d616ece2d859	575	/* UDP Lite protocol? */
mbed714	0:d616ece2d859	576	if (pcb->flags & UDP_FLAGS_UDPLITE) {
mbed714	0:d616ece2d859	577	u16_t chklen, chklen_hdr;
mbed714	0:d616ece2d859	578	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
mbed714	0:d616ece2d859	579	/* set UDP message length in UDP header */
mbed714	0:d616ece2d859	580	chklen_hdr = chklen = pcb->chksum_len_tx;
mbed714	0:d616ece2d859	581	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
mbed714	0:d616ece2d859	582	if (chklen != 0) {
mbed714	0:d616ece2d859	583	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
mbed714	0:d616ece2d859	584	}
mbed714	0:d616ece2d859	585	/* For UDP-Lite, checksum length of 0 means checksum
mbed714	0:d616ece2d859	586	over the complete packet. (See RFC 3828 chap. 3.1)
mbed714	0:d616ece2d859	587	At least the UDP-Lite header must be covered by the
mbed714	0:d616ece2d859	588	checksum, therefore, if chksum_len has an illegal
mbed714	0:d616ece2d859	589	value, we generate the checksum over the complete
mbed714	0:d616ece2d859	590	packet to be safe. */
mbed714	0:d616ece2d859	591	chklen_hdr = 0;
mbed714	0:d616ece2d859	592	chklen = q->tot_len;
mbed714	0:d616ece2d859	593	}
mbed714	0:d616ece2d859	594	udphdr->len = htons(chklen_hdr);
mbed714	0:d616ece2d859	595	/* calculate checksum */
mbed714	0:d616ece2d859	596	#if CHECKSUM_GEN_UDP
mbed714	0:d616ece2d859	597	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
mbed714	0:d616ece2d859	598	IP_PROTO_UDPLITE, q->tot_len,
mbed714	0:d616ece2d859	599	#if !LWIP_CHECKSUM_ON_COPY
mbed714	0:d616ece2d859	600	chklen);
mbed714	0:d616ece2d859	601	#else /* !LWIP_CHECKSUM_ON_COPY */
mbed714	0:d616ece2d859	602	(have_chksum ? UDP_HLEN : chklen));
mbed714	0:d616ece2d859	603	if (have_chksum) {
mbed714	0:d616ece2d859	604	u32_t acc;
mbed714	0:d616ece2d859	605	acc = udphdr->chksum + (u16_t)~(chksum);
mbed714	0:d616ece2d859	606	udphdr->chksum = FOLD_U32T(acc);
mbed714	0:d616ece2d859	607	}
mbed714	0:d616ece2d859	608	#endif /* !LWIP_CHECKSUM_ON_COPY */
mbed714	0:d616ece2d859	609
mbed714	0:d616ece2d859	610	/* chksum zero must become 0xffff, as zero means 'no checksum' */
mbed714	0:d616ece2d859	611	if (udphdr->chksum == 0x0000) {
mbed714	0:d616ece2d859	612	udphdr->chksum = 0xffff;
mbed714	0:d616ece2d859	613	}
mbed714	0:d616ece2d859	614	#endif /* CHECKSUM_GEN_UDP */
mbed714	0:d616ece2d859	615	/* output to IP */
mbed714	0:d616ece2d859	616	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
mbed714	0:d616ece2d859	617	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	618	netif->addr_hint = &(pcb->addr_hint);
mbed714	0:d616ece2d859	619	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:d616ece2d859	620	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
mbed714	0:d616ece2d859	621	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	622	netif->addr_hint = NULL;
mbed714	0:d616ece2d859	623	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:d616ece2d859	624	} else
mbed714	0:d616ece2d859	625	#endif /* LWIP_UDPLITE */
mbed714	0:d616ece2d859	626	{ /* UDP */
mbed714	0:d616ece2d859	627	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
mbed714	0:d616ece2d859	628	udphdr->len = htons(q->tot_len);
mbed714	0:d616ece2d859	629	/* calculate checksum */
mbed714	0:d616ece2d859	630	#if CHECKSUM_GEN_UDP
mbed714	0:d616ece2d859	631	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
mbed714	0:d616ece2d859	632	u16_t udpchksum;
mbed714	0:d616ece2d859	633	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:d616ece2d859	634	if (have_chksum) {
mbed714	0:d616ece2d859	635	u32_t acc;
mbed714	0:d616ece2d859	636	udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
mbed714	0:d616ece2d859	637	q->tot_len, UDP_HLEN);
mbed714	0:d616ece2d859	638	acc = udpchksum + (u16_t)~(chksum);
mbed714	0:d616ece2d859	639	udpchksum = FOLD_U32T(acc);
mbed714	0:d616ece2d859	640	} else
mbed714	0:d616ece2d859	641	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:d616ece2d859	642	{
mbed714	0:d616ece2d859	643	udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
mbed714	0:d616ece2d859	644	}
mbed714	0:d616ece2d859	645
mbed714	0:d616ece2d859	646	/* chksum zero must become 0xffff, as zero means 'no checksum' */
mbed714	0:d616ece2d859	647	if (udpchksum == 0x0000) {
mbed714	0:d616ece2d859	648	udpchksum = 0xffff;
mbed714	0:d616ece2d859	649	}
mbed714	0:d616ece2d859	650	udphdr->chksum = udpchksum;
mbed714	0:d616ece2d859	651	}
mbed714	0:d616ece2d859	652	#endif /* CHECKSUM_GEN_UDP */
mbed714	0:d616ece2d859	653	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
mbed714	0:d616ece2d859	654	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
mbed714	0:d616ece2d859	655	/* output to IP */
mbed714	0:d616ece2d859	656	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	657	netif->addr_hint = &(pcb->addr_hint);
mbed714	0:d616ece2d859	658	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:d616ece2d859	659	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
mbed714	0:d616ece2d859	660	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	661	netif->addr_hint = NULL;
mbed714	0:d616ece2d859	662	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:d616ece2d859	663	}
mbed714	0:d616ece2d859	664	/* TODO: must this be increased even if error occured? */
mbed714	0:d616ece2d859	665	snmp_inc_udpoutdatagrams();
mbed714	0:d616ece2d859	666
mbed714	0:d616ece2d859	667	/* did we chain a separate header pbuf earlier? */
mbed714	0:d616ece2d859	668	if (q != p) {
mbed714	0:d616ece2d859	669	/* free the header pbuf */
mbed714	0:d616ece2d859	670	pbuf_free(q);
mbed714	0:d616ece2d859	671	q = NULL;
mbed714	0:d616ece2d859	672	/* p is still referenced by the caller, and will live on */
mbed714	0:d616ece2d859	673	}
mbed714	0:d616ece2d859	674
mbed714	0:d616ece2d859	675	UDP_STATS_INC(udp.xmit);
mbed714	0:d616ece2d859	676	return err;
mbed714	0:d616ece2d859	677	}
mbed714	0:d616ece2d859	678
mbed714	0:d616ece2d859	679	/**
mbed714	0:d616ece2d859	680	* Bind an UDP PCB.
mbed714	0:d616ece2d859	681	*
mbed714	0:d616ece2d859	682	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
mbed714	0:d616ece2d859	683	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
mbed714	0:d616ece2d859	684	* bind to all local interfaces.
mbed714	0:d616ece2d859	685	* @param port local UDP port to bind with. Use 0 to automatically bind
mbed714	0:d616ece2d859	686	* to a random port between UDP_LOCAL_PORT_RANGE_START and
mbed714	0:d616ece2d859	687	* UDP_LOCAL_PORT_RANGE_END.
mbed714	0:d616ece2d859	688	*
mbed714	0:d616ece2d859	689	* ipaddr & port are expected to be in the same byte order as in the pcb.
mbed714	0:d616ece2d859	690	*
mbed714	0:d616ece2d859	691	* @return lwIP error code.
mbed714	0:d616ece2d859	692	* - ERR_OK. Successful. No error occured.
mbed714	0:d616ece2d859	693	* - ERR_USE. The specified ipaddr and port are already bound to by
mbed714	0:d616ece2d859	694	* another UDP PCB.
mbed714	0:d616ece2d859	695	*
mbed714	0:d616ece2d859	696	* @see udp_disconnect()
mbed714	0:d616ece2d859	697	*/
mbed714	0:d616ece2d859	698	err_t
mbed714	0:d616ece2d859	699	udp_bind(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
mbed714	0:d616ece2d859	700	{
mbed714	0:d616ece2d859	701	struct udp_pcb *ipcb;
mbed714	0:d616ece2d859	702	u8_t rebind;
mbed714	0:d616ece2d859	703
mbed714	0:d616ece2d859	704	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
mbed714	0:d616ece2d859	705	ip_addr_debug_print(UDP_DEBUG, ipaddr);
mbed714	0:d616ece2d859	706	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
mbed714	0:d616ece2d859	707
mbed714	0:d616ece2d859	708	rebind = 0;
mbed714	0:d616ece2d859	709	/* Check for double bind and rebind of the same pcb */
mbed714	0:d616ece2d859	710	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
mbed714	0:d616ece2d859	711	/* is this UDP PCB already on active list? */
mbed714	0:d616ece2d859	712	if (pcb == ipcb) {
mbed714	0:d616ece2d859	713	/* pcb may occur at most once in active list */
mbed714	0:d616ece2d859	714	LWIP_ASSERT("rebind == 0", rebind == 0);
mbed714	0:d616ece2d859	715	/* pcb already in list, just rebind */
mbed714	0:d616ece2d859	716	rebind = 1;
mbed714	0:d616ece2d859	717	}
mbed714	0:d616ece2d859	718
mbed714	0:d616ece2d859	719	/* By default, we don't allow to bind to a port that any other udp
mbed714	0:d616ece2d859	720	PCB is alread bound to, unless all PCBs with that port have tha
mbed714	0:d616ece2d859	721	REUSEADDR flag set. */
mbed714	0:d616ece2d859	722	#if SO_REUSE
mbed714	0:d616ece2d859	723	else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
mbed714	0:d616ece2d859	724	((ipcb->so_options & SOF_REUSEADDR) == 0)) {
mbed714	0:d616ece2d859	725	#else /* SO_REUSE */
mbed714	0:d616ece2d859	726	/* port matches that of PCB in list and REUSEADDR not set -> reject */
mbed714	0:d616ece2d859	727	else {
mbed714	0:d616ece2d859	728	#endif /* SO_REUSE */
mbed714	0:d616ece2d859	729	if ((ipcb->local_port == port) &&
mbed714	0:d616ece2d859	730	/* IP address matches, or one is IP_ADDR_ANY? */
mbed714	0:d616ece2d859	731	(ip_addr_isany(&(ipcb->local_ip)) \|\|
mbed714	0:d616ece2d859	732	ip_addr_isany(ipaddr) \|\|
mbed714	0:d616ece2d859	733	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
mbed714	0:d616ece2d859	734	/* other PCB already binds to this local IP and port */
mbed714	0:d616ece2d859	735	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:d616ece2d859	736	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
mbed714	0:d616ece2d859	737	return ERR_USE;
mbed714	0:d616ece2d859	738	}
mbed714	0:d616ece2d859	739	}
mbed714	0:d616ece2d859	740	}
mbed714	0:d616ece2d859	741
mbed714	0:d616ece2d859	742	ip_addr_set(&pcb->local_ip, ipaddr);
mbed714	0:d616ece2d859	743
mbed714	0:d616ece2d859	744	/* no port specified? */
mbed714	0:d616ece2d859	745	if (port == 0) {
mbed714	0:d616ece2d859	746	#ifndef UDP_LOCAL_PORT_RANGE_START
mbed714	0:d616ece2d859	747	#define UDP_LOCAL_PORT_RANGE_START 4096
mbed714	0:d616ece2d859	748	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
mbed714	0:d616ece2d859	749	#endif
mbed714	0:d616ece2d859	750	port = UDP_LOCAL_PORT_RANGE_START;
mbed714	0:d616ece2d859	751	ipcb = udp_pcbs;
mbed714	0:d616ece2d859	752	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
mbed714	0:d616ece2d859	753	if (ipcb->local_port == port) {
mbed714	0:d616ece2d859	754	/* port is already used by another udp_pcb */
mbed714	0:d616ece2d859	755	port++;
mbed714	0:d616ece2d859	756	/* restart scanning all udp pcbs */
mbed714	0:d616ece2d859	757	ipcb = udp_pcbs;
mbed714	0:d616ece2d859	758	} else {
mbed714	0:d616ece2d859	759	/* go on with next udp pcb */
mbed714	0:d616ece2d859	760	ipcb = ipcb->next;
mbed714	0:d616ece2d859	761	}
mbed714	0:d616ece2d859	762	}
mbed714	0:d616ece2d859	763	if (ipcb != NULL) {
mbed714	0:d616ece2d859	764	/* no more ports available in local range */
mbed714	0:d616ece2d859	765	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
mbed714	0:d616ece2d859	766	return ERR_USE;
mbed714	0:d616ece2d859	767	}
mbed714	0:d616ece2d859	768	}
mbed714	0:d616ece2d859	769	pcb->local_port = port;
mbed714	0:d616ece2d859	770	snmp_insert_udpidx_tree(pcb);
mbed714	0:d616ece2d859	771	/* pcb not active yet? */
mbed714	0:d616ece2d859	772	if (rebind == 0) {
mbed714	0:d616ece2d859	773	/* place the PCB on the active list if not already there */
mbed714	0:d616ece2d859	774	pcb->next = udp_pcbs;
mbed714	0:d616ece2d859	775	udp_pcbs = pcb;
mbed714	0:d616ece2d859	776	}
mbed714	0:d616ece2d859	777	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
mbed714	0:d616ece2d859	778	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
mbed714	0:d616ece2d859	779	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed714	0:d616ece2d859	780	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
mbed714	0:d616ece2d859	781	pcb->local_port));
mbed714	0:d616ece2d859	782	return ERR_OK;
mbed714	0:d616ece2d859	783	}
mbed714	0:d616ece2d859	784	/**
mbed714	0:d616ece2d859	785	* Connect an UDP PCB.
mbed714	0:d616ece2d859	786	*
mbed714	0:d616ece2d859	787	* This will associate the UDP PCB with the remote address.
mbed714	0:d616ece2d859	788	*
mbed714	0:d616ece2d859	789	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
mbed714	0:d616ece2d859	790	* @param ipaddr remote IP address to connect with.
mbed714	0:d616ece2d859	791	* @param port remote UDP port to connect with.
mbed714	0:d616ece2d859	792	*
mbed714	0:d616ece2d859	793	* @return lwIP error code
mbed714	0:d616ece2d859	794	*
mbed714	0:d616ece2d859	795	* ipaddr & port are expected to be in the same byte order as in the pcb.
mbed714	0:d616ece2d859	796	*
mbed714	0:d616ece2d859	797	* The udp pcb is bound to a random local port if not already bound.
mbed714	0:d616ece2d859	798	*
mbed714	0:d616ece2d859	799	* @see udp_disconnect()
mbed714	0:d616ece2d859	800	*/
mbed714	0:d616ece2d859	801	err_t
mbed714	0:d616ece2d859	802	udp_connect(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
mbed714	0:d616ece2d859	803	{
mbed714	0:d616ece2d859	804	struct udp_pcb *ipcb;
mbed714	0:d616ece2d859	805
mbed714	0:d616ece2d859	806	if (pcb->local_port == 0) {
mbed714	0:d616ece2d859	807	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
mbed714	0:d616ece2d859	808	if (err != ERR_OK) {
mbed714	0:d616ece2d859	809	return err;
mbed714	0:d616ece2d859	810	}
mbed714	0:d616ece2d859	811	}
mbed714	0:d616ece2d859	812
mbed714	0:d616ece2d859	813	ip_addr_set(&pcb->remote_ip, ipaddr);
mbed714	0:d616ece2d859	814	pcb->remote_port = port;
mbed714	0:d616ece2d859	815	pcb->flags \|= UDP_FLAGS_CONNECTED;
mbed714	0:d616ece2d859	816	/** TODO: this functionality belongs in upper layers */
mbed714	0:d616ece2d859	817	#ifdef LWIP_UDP_TODO
mbed714	0:d616ece2d859	818	/* Nail down local IP for netconn_addr()/getsockname() */
mbed714	0:d616ece2d859	819	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
mbed714	0:d616ece2d859	820	struct netif *netif;
mbed714	0:d616ece2d859	821
mbed714	0:d616ece2d859	822	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
mbed714	0:d616ece2d859	823	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
mbed714	0:d616ece2d859	824	UDP_STATS_INC(udp.rterr);
mbed714	0:d616ece2d859	825	return ERR_RTE;
mbed714	0:d616ece2d859	826	}
mbed714	0:d616ece2d859	827	/** TODO: this will bind the udp pcb locally, to the interface which
mbed714	0:d616ece2d859	828	is used to route output packets to the remote address. However, we
mbed714	0:d616ece2d859	829	might want to accept incoming packets on any interface! */
mbed714	0:d616ece2d859	830	pcb->local_ip = netif->ip_addr;
mbed714	0:d616ece2d859	831	} else if (ip_addr_isany(&pcb->remote_ip)) {
mbed714	0:d616ece2d859	832	pcb->local_ip.addr = 0;
mbed714	0:d616ece2d859	833	}
mbed714	0:d616ece2d859	834	#endif
mbed714	0:d616ece2d859	835	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
mbed714	0:d616ece2d859	836	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
mbed714	0:d616ece2d859	837	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed714	0:d616ece2d859	838	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
mbed714	0:d616ece2d859	839	pcb->local_port));
mbed714	0:d616ece2d859	840
mbed714	0:d616ece2d859	841	/* Insert UDP PCB into the list of active UDP PCBs. */
mbed714	0:d616ece2d859	842	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
mbed714	0:d616ece2d859	843	if (pcb == ipcb) {
mbed714	0:d616ece2d859	844	/* already on the list, just return */
mbed714	0:d616ece2d859	845	return ERR_OK;
mbed714	0:d616ece2d859	846	}
mbed714	0:d616ece2d859	847	}
mbed714	0:d616ece2d859	848	/* PCB not yet on the list, add PCB now */
mbed714	0:d616ece2d859	849	pcb->next = udp_pcbs;
mbed714	0:d616ece2d859	850	udp_pcbs = pcb;
mbed714	0:d616ece2d859	851	return ERR_OK;
mbed714	0:d616ece2d859	852	}
mbed714	0:d616ece2d859	853
mbed714	0:d616ece2d859	854	/**
mbed714	0:d616ece2d859	855	* Disconnect a UDP PCB
mbed714	0:d616ece2d859	856	*
mbed714	0:d616ece2d859	857	* @param pcb the udp pcb to disconnect.
mbed714	0:d616ece2d859	858	*/
mbed714	0:d616ece2d859	859	void
mbed714	0:d616ece2d859	860	udp_disconnect(struct udp_pcb *pcb)
mbed714	0:d616ece2d859	861	{
mbed714	0:d616ece2d859	862	/* reset remote address association */
mbed714	0:d616ece2d859	863	ip_addr_set_any(&pcb->remote_ip);
mbed714	0:d616ece2d859	864	pcb->remote_port = 0;
mbed714	0:d616ece2d859	865	/* mark PCB as unconnected */
mbed714	0:d616ece2d859	866	pcb->flags &= ~UDP_FLAGS_CONNECTED;
mbed714	0:d616ece2d859	867	}
mbed714	0:d616ece2d859	868
mbed714	0:d616ece2d859	869	/**
mbed714	0:d616ece2d859	870	* Set a receive callback for a UDP PCB
mbed714	0:d616ece2d859	871	*
mbed714	0:d616ece2d859	872	* This callback will be called when receiving a datagram for the pcb.
mbed714	0:d616ece2d859	873	*
mbed714	0:d616ece2d859	874	* @param pcb the pcb for wich to set the recv callback
mbed714	0:d616ece2d859	875	* @param recv function pointer of the callback function
mbed714	0:d616ece2d859	876	* @param recv_arg additional argument to pass to the callback function
mbed714	0:d616ece2d859	877	*/
mbed714	0:d616ece2d859	878	void
mbed714	0:d616ece2d859	879	udp_recv(struct udp_pcb pcb, udp_recv_fn recv, void recv_arg)
mbed714	0:d616ece2d859	880	{
mbed714	0:d616ece2d859	881	/* remember recv() callback and user data */
mbed714	0:d616ece2d859	882	pcb->recv = recv;
mbed714	0:d616ece2d859	883	pcb->recv_arg = recv_arg;
mbed714	0:d616ece2d859	884	}
mbed714	0:d616ece2d859	885
mbed714	0:d616ece2d859	886	/**
mbed714	0:d616ece2d859	887	* Remove an UDP PCB.
mbed714	0:d616ece2d859	888	*
mbed714	0:d616ece2d859	889	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
mbed714	0:d616ece2d859	890	* UDP PCB's and the data structure is freed from memory.
mbed714	0:d616ece2d859	891	*
mbed714	0:d616ece2d859	892	* @see udp_new()
mbed714	0:d616ece2d859	893	*/
mbed714	0:d616ece2d859	894	void
mbed714	0:d616ece2d859	895	udp_remove(struct udp_pcb *pcb)
mbed714	0:d616ece2d859	896	{
mbed714	0:d616ece2d859	897	struct udp_pcb *pcb2;
mbed714	0:d616ece2d859	898
mbed714	0:d616ece2d859	899	snmp_delete_udpidx_tree(pcb);
mbed714	0:d616ece2d859	900	/* pcb to be removed is first in list? */
mbed714	0:d616ece2d859	901	if (udp_pcbs == pcb) {
mbed714	0:d616ece2d859	902	/* make list start at 2nd pcb */
mbed714	0:d616ece2d859	903	udp_pcbs = udp_pcbs->next;
mbed714	0:d616ece2d859	904	/* pcb not 1st in list */
mbed714	0:d616ece2d859	905	} else {
mbed714	0:d616ece2d859	906	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
mbed714	0:d616ece2d859	907	/* find pcb in udp_pcbs list */
mbed714	0:d616ece2d859	908	if (pcb2->next != NULL && pcb2->next == pcb) {
mbed714	0:d616ece2d859	909	/* remove pcb from list */
mbed714	0:d616ece2d859	910	pcb2->next = pcb->next;
mbed714	0:d616ece2d859	911	}
mbed714	0:d616ece2d859	912	}
mbed714	0:d616ece2d859	913	}
mbed714	0:d616ece2d859	914	memp_free(MEMP_UDP_PCB, pcb);
mbed714	0:d616ece2d859	915	}
mbed714	0:d616ece2d859	916
mbed714	0:d616ece2d859	917	/**
mbed714	0:d616ece2d859	918	* Create a UDP PCB.
mbed714	0:d616ece2d859	919	*
mbed714	0:d616ece2d859	920	* @return The UDP PCB which was created. NULL if the PCB data structure
mbed714	0:d616ece2d859	921	* could not be allocated.
mbed714	0:d616ece2d859	922	*
mbed714	0:d616ece2d859	923	* @see udp_remove()
mbed714	0:d616ece2d859	924	*/
mbed714	0:d616ece2d859	925	struct udp_pcb *
mbed714	0:d616ece2d859	926	udp_new(void)
mbed714	0:d616ece2d859	927	{
mbed714	0:d616ece2d859	928	struct udp_pcb *pcb;
mbed714	0:d616ece2d859	929	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
mbed714	0:d616ece2d859	930	/* could allocate UDP PCB? */
mbed714	0:d616ece2d859	931	if (pcb != NULL) {
mbed714	0:d616ece2d859	932	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
mbed714	0:d616ece2d859	933	* which means checksum is generated over the whole datagram per default
mbed714	0:d616ece2d859	934	* (recommended as default by RFC 3828). */
mbed714	0:d616ece2d859	935	/* initialize PCB to all zeroes */
mbed714	0:d616ece2d859	936	memset(pcb, 0, sizeof(struct udp_pcb));
mbed714	0:d616ece2d859	937	pcb->ttl = UDP_TTL;
mbed714	0:d616ece2d859	938	}
mbed714	0:d616ece2d859	939	return pcb;
mbed714	0:d616ece2d859	940	}
mbed714	0:d616ece2d859	941
mbed714	0:d616ece2d859	942	#if UDP_DEBUG
mbed714	0:d616ece2d859	943	/**
mbed714	0:d616ece2d859	944	* Print UDP header information for debug purposes.
mbed714	0:d616ece2d859	945	*
mbed714	0:d616ece2d859	946	* @param udphdr pointer to the udp header in memory.
mbed714	0:d616ece2d859	947	*/
mbed714	0:d616ece2d859	948	void
mbed714	0:d616ece2d859	949	udp_debug_print(struct udp_hdr *udphdr)
mbed714	0:d616ece2d859	950	{
mbed714	0:d616ece2d859	951	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
mbed714	0:d616ece2d859	952	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	953	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
mbed714	0:d616ece2d859	954	ntohs(udphdr->src), ntohs(udphdr->dest)));
mbed714	0:d616ece2d859	955	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	956	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
mbed714	0:d616ece2d859	957	ntohs(udphdr->len), ntohs(udphdr->chksum)));
mbed714	0:d616ece2d859	958	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:d616ece2d859	959	}
mbed714	0:d616ece2d859	960	#endif /* UDP_DEBUG */
mbed714	0:d616ece2d859	961
mbed714	0:d616ece2d859	962	#endif /* LWIP_UDP */

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Type:	Library
Created:	18 Sep 2010
Imports:	1
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

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lwip/core/udp.c@0:d616ece2d859, 2010-09-18 (annotated)

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