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lwip/core/udp.c@0:98aadd37a5c5, 2010-09-29 (annotated)

Committer:: mbed714
Date:: Wed Sep 29 19:48:03 2010 +0000
Revision:: 0:98aadd37a5c5

Who changed what in which revision?

User	Revision	Line number	New contents of line
mbed714	0:98aadd37a5c5	1	/**
mbed714	0:98aadd37a5c5	2	* @file
mbed714	0:98aadd37a5c5	3	* User Datagram Protocol module
mbed714	0:98aadd37a5c5	4	*
mbed714	0:98aadd37a5c5	5	*/
mbed714	0:98aadd37a5c5	6
mbed714	0:98aadd37a5c5	7	/*
mbed714	0:98aadd37a5c5	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed714	0:98aadd37a5c5	9	* All rights reserved.
mbed714	0:98aadd37a5c5	10	*
mbed714	0:98aadd37a5c5	11	* Redistribution and use in source and binary forms, with or without modification,
mbed714	0:98aadd37a5c5	12	* are permitted provided that the following conditions are met:
mbed714	0:98aadd37a5c5	13	*
mbed714	0:98aadd37a5c5	14	* 1. Redistributions of source code must retain the above copyright notice,
mbed714	0:98aadd37a5c5	15	* this list of conditions and the following disclaimer.
mbed714	0:98aadd37a5c5	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
mbed714	0:98aadd37a5c5	17	* this list of conditions and the following disclaimer in the documentation
mbed714	0:98aadd37a5c5	18	* and/or other materials provided with the distribution.
mbed714	0:98aadd37a5c5	19	* 3. The name of the author may not be used to endorse or promote products
mbed714	0:98aadd37a5c5	20	* derived from this software without specific prior written permission.
mbed714	0:98aadd37a5c5	21	*
mbed714	0:98aadd37a5c5	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed714	0:98aadd37a5c5	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed714	0:98aadd37a5c5	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed714	0:98aadd37a5c5	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed714	0:98aadd37a5c5	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed714	0:98aadd37a5c5	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed714	0:98aadd37a5c5	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed714	0:98aadd37a5c5	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed714	0:98aadd37a5c5	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed714	0:98aadd37a5c5	31	* OF SUCH DAMAGE.
mbed714	0:98aadd37a5c5	32	*
mbed714	0:98aadd37a5c5	33	* This file is part of the lwIP TCP/IP stack.
mbed714	0:98aadd37a5c5	34	*
mbed714	0:98aadd37a5c5	35	* Author: Adam Dunkels <adam@sics.se>
mbed714	0:98aadd37a5c5	36	*
mbed714	0:98aadd37a5c5	37	*/
mbed714	0:98aadd37a5c5	38
mbed714	0:98aadd37a5c5	39
mbed714	0:98aadd37a5c5	40	/* udp.c
mbed714	0:98aadd37a5c5	41	*
mbed714	0:98aadd37a5c5	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
mbed714	0:98aadd37a5c5	43	*
mbed714	0:98aadd37a5c5	44	*/
mbed714	0:98aadd37a5c5	45
mbed714	0:98aadd37a5c5	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
mbed714	0:98aadd37a5c5	47	*/
mbed714	0:98aadd37a5c5	48
mbed714	0:98aadd37a5c5	49	#include "lwip/opt.h"
mbed714	0:98aadd37a5c5	50
mbed714	0:98aadd37a5c5	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
mbed714	0:98aadd37a5c5	52
mbed714	0:98aadd37a5c5	53	#include "lwip/udp.h"
mbed714	0:98aadd37a5c5	54	#include "lwip/def.h"
mbed714	0:98aadd37a5c5	55	#include "lwip/memp.h"
mbed714	0:98aadd37a5c5	56	#include "lwip/inet_chksum.h"
mbed714	0:98aadd37a5c5	57	#include "lwip/ip_addr.h"
mbed714	0:98aadd37a5c5	58	#include "lwip/netif.h"
mbed714	0:98aadd37a5c5	59	#include "lwip/icmp.h"
mbed714	0:98aadd37a5c5	60	#include "lwip/stats.h"
mbed714	0:98aadd37a5c5	61	#include "lwip/snmp.h"
mbed714	0:98aadd37a5c5	62	#include "arch/perf.h"
mbed714	0:98aadd37a5c5	63	#include "lwip/dhcp.h"
mbed714	0:98aadd37a5c5	64
mbed714	0:98aadd37a5c5	65	#include <string.h>
mbed714	0:98aadd37a5c5	66
mbed714	0:98aadd37a5c5	67	/* The list of UDP PCBs */
mbed714	0:98aadd37a5c5	68	/* exported in udp.h (was static) */
mbed714	0:98aadd37a5c5	69	struct udp_pcb *udp_pcbs;
mbed714	0:98aadd37a5c5	70
mbed714	0:98aadd37a5c5	71	/**
mbed714	0:98aadd37a5c5	72	* Process an incoming UDP datagram.
mbed714	0:98aadd37a5c5	73	*
mbed714	0:98aadd37a5c5	74	* Given an incoming UDP datagram (as a chain of pbufs) this function
mbed714	0:98aadd37a5c5	75	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
mbed714	0:98aadd37a5c5	76	* recv function. If no pcb is found or the datagram is incorrect, the
mbed714	0:98aadd37a5c5	77	* pbuf is freed.
mbed714	0:98aadd37a5c5	78	*
mbed714	0:98aadd37a5c5	79	* @param p pbuf to be demultiplexed to a UDP PCB.
mbed714	0:98aadd37a5c5	80	* @param inp network interface on which the datagram was received.
mbed714	0:98aadd37a5c5	81	*
mbed714	0:98aadd37a5c5	82	*/
mbed714	0:98aadd37a5c5	83	void
mbed714	0:98aadd37a5c5	84	udp_input(struct pbuf p, struct netif inp)
mbed714	0:98aadd37a5c5	85	{
mbed714	0:98aadd37a5c5	86	struct udp_hdr *udphdr;
mbed714	0:98aadd37a5c5	87	struct udp_pcb pcb, prev;
mbed714	0:98aadd37a5c5	88	struct udp_pcb *uncon_pcb;
mbed714	0:98aadd37a5c5	89	struct ip_hdr *iphdr;
mbed714	0:98aadd37a5c5	90	u16_t src, dest;
mbed714	0:98aadd37a5c5	91	u8_t local_match;
mbed714	0:98aadd37a5c5	92	u8_t broadcast;
mbed714	0:98aadd37a5c5	93
mbed714	0:98aadd37a5c5	94	PERF_START;
mbed714	0:98aadd37a5c5	95
mbed714	0:98aadd37a5c5	96	UDP_STATS_INC(udp.recv);
mbed714	0:98aadd37a5c5	97
mbed714	0:98aadd37a5c5	98	iphdr = (struct ip_hdr *)p->payload;
mbed714	0:98aadd37a5c5	99
mbed714	0:98aadd37a5c5	100	/* Check minimum length (IP header + UDP header)
mbed714	0:98aadd37a5c5	101	* and move payload pointer to UDP header */
mbed714	0:98aadd37a5c5	102	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
mbed714	0:98aadd37a5c5	103	/* drop short packets */
mbed714	0:98aadd37a5c5	104	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:98aadd37a5c5	105	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
mbed714	0:98aadd37a5c5	106	UDP_STATS_INC(udp.lenerr);
mbed714	0:98aadd37a5c5	107	UDP_STATS_INC(udp.drop);
mbed714	0:98aadd37a5c5	108	snmp_inc_udpinerrors();
mbed714	0:98aadd37a5c5	109	pbuf_free(p);
mbed714	0:98aadd37a5c5	110	goto end;
mbed714	0:98aadd37a5c5	111	}
mbed714	0:98aadd37a5c5	112
mbed714	0:98aadd37a5c5	113	udphdr = (struct udp_hdr *)p->payload;
mbed714	0:98aadd37a5c5	114
mbed714	0:98aadd37a5c5	115	/* is broadcast packet ? */
mbed714	0:98aadd37a5c5	116	broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
mbed714	0:98aadd37a5c5	117
mbed714	0:98aadd37a5c5	118	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
mbed714	0:98aadd37a5c5	119
mbed714	0:98aadd37a5c5	120	/* convert src and dest ports to host byte order */
mbed714	0:98aadd37a5c5	121	src = ntohs(udphdr->src);
mbed714	0:98aadd37a5c5	122	dest = ntohs(udphdr->dest);
mbed714	0:98aadd37a5c5	123
mbed714	0:98aadd37a5c5	124	udp_debug_print(udphdr);
mbed714	0:98aadd37a5c5	125
mbed714	0:98aadd37a5c5	126	/* print the UDP source and destination */
mbed714	0:98aadd37a5c5	127	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:98aadd37a5c5	128	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
mbed714	0:98aadd37a5c5	129	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
mbed714	0:98aadd37a5c5	130	ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
mbed714	0:98aadd37a5c5	131	ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
mbed714	0:98aadd37a5c5	132	ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
mbed714	0:98aadd37a5c5	133	ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
mbed714	0:98aadd37a5c5	134
mbed714	0:98aadd37a5c5	135	#if LWIP_DHCP
mbed714	0:98aadd37a5c5	136	pcb = NULL;
mbed714	0:98aadd37a5c5	137	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
mbed714	0:98aadd37a5c5	138	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
mbed714	0:98aadd37a5c5	139	if (dest == DHCP_CLIENT_PORT) {
mbed714	0:98aadd37a5c5	140	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
mbed714	0:98aadd37a5c5	141	if (src == DHCP_SERVER_PORT) {
mbed714	0:98aadd37a5c5	142	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
mbed714	0:98aadd37a5c5	143	/* accept the packe if
mbed714	0:98aadd37a5c5	144	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
mbed714	0:98aadd37a5c5	145	- inp->dhcp->pcb->remote == ANY or iphdr->src */
mbed714	0:98aadd37a5c5	146	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
mbed714	0:98aadd37a5c5	147	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
mbed714	0:98aadd37a5c5	148	pcb = inp->dhcp->pcb;
mbed714	0:98aadd37a5c5	149	}
mbed714	0:98aadd37a5c5	150	}
mbed714	0:98aadd37a5c5	151	}
mbed714	0:98aadd37a5c5	152	} else
mbed714	0:98aadd37a5c5	153	#endif /* LWIP_DHCP */
mbed714	0:98aadd37a5c5	154	{
mbed714	0:98aadd37a5c5	155	prev = NULL;
mbed714	0:98aadd37a5c5	156	local_match = 0;
mbed714	0:98aadd37a5c5	157	uncon_pcb = NULL;
mbed714	0:98aadd37a5c5	158	/* Iterate through the UDP pcb list for a matching pcb.
mbed714	0:98aadd37a5c5	159	* 'Perfect match' pcbs (connected to the remote port & ip address) are
mbed714	0:98aadd37a5c5	160	* preferred. If no perfect match is found, the first unconnected pcb that
mbed714	0:98aadd37a5c5	161	* matches the local port and ip address gets the datagram. */
mbed714	0:98aadd37a5c5	162	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
mbed714	0:98aadd37a5c5	163	local_match = 0;
mbed714	0:98aadd37a5c5	164	/* print the PCB local and remote address */
mbed714	0:98aadd37a5c5	165	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:98aadd37a5c5	166	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
mbed714	0:98aadd37a5c5	167	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
mbed714	0:98aadd37a5c5	168	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed714	0:98aadd37a5c5	169	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
mbed714	0:98aadd37a5c5	170	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
mbed714	0:98aadd37a5c5	171	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
mbed714	0:98aadd37a5c5	172
mbed714	0:98aadd37a5c5	173	/* compare PCB local addr+port to UDP destination addr+port */
mbed714	0:98aadd37a5c5	174	if ((pcb->local_port == dest) &&
mbed714	0:98aadd37a5c5	175	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
mbed714	0:98aadd37a5c5	176	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) \|\|
mbed714	0:98aadd37a5c5	177	#if LWIP_IGMP
mbed714	0:98aadd37a5c5	178	ip_addr_ismulticast(&current_iphdr_dest) \|\|
mbed714	0:98aadd37a5c5	179	#endif /* LWIP_IGMP */
mbed714	0:98aadd37a5c5	180	#if IP_SOF_BROADCAST_RECV
mbed714	0:98aadd37a5c5	181	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
mbed714	0:98aadd37a5c5	182	#else /* IP_SOF_BROADCAST_RECV */
mbed714	0:98aadd37a5c5	183	(broadcast))) {
mbed714	0:98aadd37a5c5	184	#endif /* IP_SOF_BROADCAST_RECV */
mbed714	0:98aadd37a5c5	185	local_match = 1;
mbed714	0:98aadd37a5c5	186	if ((uncon_pcb == NULL) &&
mbed714	0:98aadd37a5c5	187	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
mbed714	0:98aadd37a5c5	188	/* the first unconnected matching PCB */
mbed714	0:98aadd37a5c5	189	uncon_pcb = pcb;
mbed714	0:98aadd37a5c5	190	}
mbed714	0:98aadd37a5c5	191	}
mbed714	0:98aadd37a5c5	192	/* compare PCB remote addr+port to UDP source addr+port */
mbed714	0:98aadd37a5c5	193	if ((local_match != 0) &&
mbed714	0:98aadd37a5c5	194	(pcb->remote_port == src) &&
mbed714	0:98aadd37a5c5	195	(ip_addr_isany(&pcb->remote_ip) \|\|
mbed714	0:98aadd37a5c5	196	ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
mbed714	0:98aadd37a5c5	197	/* the first fully matching PCB */
mbed714	0:98aadd37a5c5	198	if (prev != NULL) {
mbed714	0:98aadd37a5c5	199	/* move the pcb to the front of udp_pcbs so that is
mbed714	0:98aadd37a5c5	200	found faster next time */
mbed714	0:98aadd37a5c5	201	prev->next = pcb->next;
mbed714	0:98aadd37a5c5	202	pcb->next = udp_pcbs;
mbed714	0:98aadd37a5c5	203	udp_pcbs = pcb;
mbed714	0:98aadd37a5c5	204	} else {
mbed714	0:98aadd37a5c5	205	UDP_STATS_INC(udp.cachehit);
mbed714	0:98aadd37a5c5	206	}
mbed714	0:98aadd37a5c5	207	break;
mbed714	0:98aadd37a5c5	208	}
mbed714	0:98aadd37a5c5	209	prev = pcb;
mbed714	0:98aadd37a5c5	210	}
mbed714	0:98aadd37a5c5	211	/* no fully matching pcb found? then look for an unconnected pcb */
mbed714	0:98aadd37a5c5	212	if (pcb == NULL) {
mbed714	0:98aadd37a5c5	213	pcb = uncon_pcb;
mbed714	0:98aadd37a5c5	214	}
mbed714	0:98aadd37a5c5	215	}
mbed714	0:98aadd37a5c5	216
mbed714	0:98aadd37a5c5	217	/* Check checksum if this is a match or if it was directed at us. */
mbed714	0:98aadd37a5c5	218	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
mbed714	0:98aadd37a5c5	219	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
mbed714	0:98aadd37a5c5	220	#if LWIP_UDPLITE
mbed714	0:98aadd37a5c5	221	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
mbed714	0:98aadd37a5c5	222	/* Do the UDP Lite checksum */
mbed714	0:98aadd37a5c5	223	#if CHECKSUM_CHECK_UDP
mbed714	0:98aadd37a5c5	224	u16_t chklen = ntohs(udphdr->len);
mbed714	0:98aadd37a5c5	225	if (chklen < sizeof(struct udp_hdr)) {
mbed714	0:98aadd37a5c5	226	if (chklen == 0) {
mbed714	0:98aadd37a5c5	227	/* For UDP-Lite, checksum length of 0 means checksum
mbed714	0:98aadd37a5c5	228	over the complete packet (See RFC 3828 chap. 3.1) */
mbed714	0:98aadd37a5c5	229	chklen = p->tot_len;
mbed714	0:98aadd37a5c5	230	} else {
mbed714	0:98aadd37a5c5	231	/* At least the UDP-Lite header must be covered by the
mbed714	0:98aadd37a5c5	232	checksum! (Again, see RFC 3828 chap. 3.1) */
mbed714	0:98aadd37a5c5	233	UDP_STATS_INC(udp.chkerr);
mbed714	0:98aadd37a5c5	234	UDP_STATS_INC(udp.drop);
mbed714	0:98aadd37a5c5	235	snmp_inc_udpinerrors();
mbed714	0:98aadd37a5c5	236	pbuf_free(p);
mbed714	0:98aadd37a5c5	237	goto end;
mbed714	0:98aadd37a5c5	238	}
mbed714	0:98aadd37a5c5	239	}
mbed714	0:98aadd37a5c5	240	if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
mbed714	0:98aadd37a5c5	241	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
mbed714	0:98aadd37a5c5	242	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:98aadd37a5c5	243	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
mbed714	0:98aadd37a5c5	244	UDP_STATS_INC(udp.chkerr);
mbed714	0:98aadd37a5c5	245	UDP_STATS_INC(udp.drop);
mbed714	0:98aadd37a5c5	246	snmp_inc_udpinerrors();
mbed714	0:98aadd37a5c5	247	pbuf_free(p);
mbed714	0:98aadd37a5c5	248	goto end;
mbed714	0:98aadd37a5c5	249	}
mbed714	0:98aadd37a5c5	250	#endif /* CHECKSUM_CHECK_UDP */
mbed714	0:98aadd37a5c5	251	} else
mbed714	0:98aadd37a5c5	252	#endif /* LWIP_UDPLITE */
mbed714	0:98aadd37a5c5	253	{
mbed714	0:98aadd37a5c5	254	#if CHECKSUM_CHECK_UDP
mbed714	0:98aadd37a5c5	255	if (udphdr->chksum != 0) {
mbed714	0:98aadd37a5c5	256	if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
mbed714	0:98aadd37a5c5	257	IP_PROTO_UDP, p->tot_len) != 0) {
mbed714	0:98aadd37a5c5	258	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:98aadd37a5c5	259	("udp_input: UDP datagram discarded due to failing checksum\n"));
mbed714	0:98aadd37a5c5	260	UDP_STATS_INC(udp.chkerr);
mbed714	0:98aadd37a5c5	261	UDP_STATS_INC(udp.drop);
mbed714	0:98aadd37a5c5	262	snmp_inc_udpinerrors();
mbed714	0:98aadd37a5c5	263	pbuf_free(p);
mbed714	0:98aadd37a5c5	264	goto end;
mbed714	0:98aadd37a5c5	265	}
mbed714	0:98aadd37a5c5	266	}
mbed714	0:98aadd37a5c5	267	#endif /* CHECKSUM_CHECK_UDP */
mbed714	0:98aadd37a5c5	268	}
mbed714	0:98aadd37a5c5	269	if(pbuf_header(p, -UDP_HLEN)) {
mbed714	0:98aadd37a5c5	270	/* Can we cope with this failing? Just assert for now */
mbed714	0:98aadd37a5c5	271	LWIP_ASSERT("pbuf_header failed\n", 0);
mbed714	0:98aadd37a5c5	272	UDP_STATS_INC(udp.drop);
mbed714	0:98aadd37a5c5	273	snmp_inc_udpinerrors();
mbed714	0:98aadd37a5c5	274	pbuf_free(p);
mbed714	0:98aadd37a5c5	275	goto end;
mbed714	0:98aadd37a5c5	276	}
mbed714	0:98aadd37a5c5	277	if (pcb != NULL) {
mbed714	0:98aadd37a5c5	278	snmp_inc_udpindatagrams();
mbed714	0:98aadd37a5c5	279	#if SO_REUSE && SO_REUSE_RXTOALL
mbed714	0:98aadd37a5c5	280	if ((broadcast \|\| ip_addr_ismulticast(&current_iphdr_dest)) &&
mbed714	0:98aadd37a5c5	281	((pcb->so_options & SOF_REUSEADDR) != 0)) {
mbed714	0:98aadd37a5c5	282	/* pass broadcast- or multicast packets to all multicast pcbs
mbed714	0:98aadd37a5c5	283	if SOF_REUSEADDR is set on the first match */
mbed714	0:98aadd37a5c5	284	struct udp_pcb *mpcb;
mbed714	0:98aadd37a5c5	285	u8_t p_header_changed = 0;
mbed714	0:98aadd37a5c5	286	for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
mbed714	0:98aadd37a5c5	287	if (mpcb != pcb) {
mbed714	0:98aadd37a5c5	288	/* compare PCB local addr+port to UDP destination addr+port */
mbed714	0:98aadd37a5c5	289	if ((mpcb->local_port == dest) &&
mbed714	0:98aadd37a5c5	290	((!broadcast && ip_addr_isany(&mpcb->local_ip)) \|\|
mbed714	0:98aadd37a5c5	291	ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) \|\|
mbed714	0:98aadd37a5c5	292	#if LWIP_IGMP
mbed714	0:98aadd37a5c5	293	ip_addr_ismulticast(&current_iphdr_dest) \|\|
mbed714	0:98aadd37a5c5	294	#endif /* LWIP_IGMP */
mbed714	0:98aadd37a5c5	295	#if IP_SOF_BROADCAST_RECV
mbed714	0:98aadd37a5c5	296	(broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
mbed714	0:98aadd37a5c5	297	#else /* IP_SOF_BROADCAST_RECV */
mbed714	0:98aadd37a5c5	298	(broadcast))) {
mbed714	0:98aadd37a5c5	299	#endif /* IP_SOF_BROADCAST_RECV */
mbed714	0:98aadd37a5c5	300	/* pass a copy of the packet to all local matches */
mbed714	0:98aadd37a5c5	301	if (mpcb->recv != NULL) {
mbed714	0:98aadd37a5c5	302	struct pbuf *q;
mbed714	0:98aadd37a5c5	303	/* for that, move payload to IP header again */
mbed714	0:98aadd37a5c5	304	if (p_header_changed == 0) {
mbed714	0:98aadd37a5c5	305	pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed714	0:98aadd37a5c5	306	p_header_changed = 1;
mbed714	0:98aadd37a5c5	307	}
mbed714	0:98aadd37a5c5	308	q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
mbed714	0:98aadd37a5c5	309	if (q != NULL) {
mbed714	0:98aadd37a5c5	310	err_t err = pbuf_copy(q, p);
mbed714	0:98aadd37a5c5	311	if (err == ERR_OK) {
mbed714	0:98aadd37a5c5	312	/* move payload to UDP data */
mbed714	0:98aadd37a5c5	313	pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed714	0:98aadd37a5c5	314	mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
mbed714	0:98aadd37a5c5	315	}
mbed714	0:98aadd37a5c5	316	}
mbed714	0:98aadd37a5c5	317	}
mbed714	0:98aadd37a5c5	318	}
mbed714	0:98aadd37a5c5	319	}
mbed714	0:98aadd37a5c5	320	}
mbed714	0:98aadd37a5c5	321	if (p_header_changed) {
mbed714	0:98aadd37a5c5	322	/* and move payload to UDP data again */
mbed714	0:98aadd37a5c5	323	pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
mbed714	0:98aadd37a5c5	324	}
mbed714	0:98aadd37a5c5	325	}
mbed714	0:98aadd37a5c5	326	#endif /* SO_REUSE && SO_REUSE_RXTOALL */
mbed714	0:98aadd37a5c5	327	/* callback */
mbed714	0:98aadd37a5c5	328	if (pcb->recv != NULL) {
mbed714	0:98aadd37a5c5	329	/* now the recv function is responsible for freeing p */
mbed714	0:98aadd37a5c5	330	pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
mbed714	0:98aadd37a5c5	331	} else {
mbed714	0:98aadd37a5c5	332	/* no recv function registered? then we have to free the pbuf! */
mbed714	0:98aadd37a5c5	333	pbuf_free(p);
mbed714	0:98aadd37a5c5	334	goto end;
mbed714	0:98aadd37a5c5	335	}
mbed714	0:98aadd37a5c5	336	} else {
mbed714	0:98aadd37a5c5	337	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
mbed714	0:98aadd37a5c5	338
mbed714	0:98aadd37a5c5	339	#if LWIP_ICMP
mbed714	0:98aadd37a5c5	340	/* No match was found, send ICMP destination port unreachable unless
mbed714	0:98aadd37a5c5	341	destination address was broadcast/multicast. */
mbed714	0:98aadd37a5c5	342	if (!broadcast &&
mbed714	0:98aadd37a5c5	343	!ip_addr_ismulticast(&current_iphdr_dest)) {
mbed714	0:98aadd37a5c5	344	/* move payload pointer back to ip header */
mbed714	0:98aadd37a5c5	345	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
mbed714	0:98aadd37a5c5	346	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
mbed714	0:98aadd37a5c5	347	icmp_dest_unreach(p, ICMP_DUR_PORT);
mbed714	0:98aadd37a5c5	348	}
mbed714	0:98aadd37a5c5	349	#endif /* LWIP_ICMP */
mbed714	0:98aadd37a5c5	350	UDP_STATS_INC(udp.proterr);
mbed714	0:98aadd37a5c5	351	UDP_STATS_INC(udp.drop);
mbed714	0:98aadd37a5c5	352	snmp_inc_udpnoports();
mbed714	0:98aadd37a5c5	353	pbuf_free(p);
mbed714	0:98aadd37a5c5	354	}
mbed714	0:98aadd37a5c5	355	} else {
mbed714	0:98aadd37a5c5	356	pbuf_free(p);
mbed714	0:98aadd37a5c5	357	}
mbed714	0:98aadd37a5c5	358	end:
mbed714	0:98aadd37a5c5	359	PERF_STOP("udp_input");
mbed714	0:98aadd37a5c5	360	}
mbed714	0:98aadd37a5c5	361
mbed714	0:98aadd37a5c5	362	/**
mbed714	0:98aadd37a5c5	363	* Send data using UDP.
mbed714	0:98aadd37a5c5	364	*
mbed714	0:98aadd37a5c5	365	* @param pcb UDP PCB used to send the data.
mbed714	0:98aadd37a5c5	366	* @param p chain of pbuf's to be sent.
mbed714	0:98aadd37a5c5	367	*
mbed714	0:98aadd37a5c5	368	* The datagram will be sent to the current remote_ip & remote_port
mbed714	0:98aadd37a5c5	369	* stored in pcb. If the pcb is not bound to a port, it will
mbed714	0:98aadd37a5c5	370	* automatically be bound to a random port.
mbed714	0:98aadd37a5c5	371	*
mbed714	0:98aadd37a5c5	372	* @return lwIP error code.
mbed714	0:98aadd37a5c5	373	* - ERR_OK. Successful. No error occured.
mbed714	0:98aadd37a5c5	374	* - ERR_MEM. Out of memory.
mbed714	0:98aadd37a5c5	375	* - ERR_RTE. Could not find route to destination address.
mbed714	0:98aadd37a5c5	376	* - More errors could be returned by lower protocol layers.
mbed714	0:98aadd37a5c5	377	*
mbed714	0:98aadd37a5c5	378	* @see udp_disconnect() udp_sendto()
mbed714	0:98aadd37a5c5	379	*/
mbed714	0:98aadd37a5c5	380	err_t
mbed714	0:98aadd37a5c5	381	udp_send(struct udp_pcb pcb, struct pbuf p)
mbed714	0:98aadd37a5c5	382	{
mbed714	0:98aadd37a5c5	383	/* send to the packet using remote ip and port stored in the pcb */
mbed714	0:98aadd37a5c5	384	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
mbed714	0:98aadd37a5c5	385	}
mbed714	0:98aadd37a5c5	386
mbed714	0:98aadd37a5c5	387	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:98aadd37a5c5	388	/** Same as udp_send() but with checksum
mbed714	0:98aadd37a5c5	389	*/
mbed714	0:98aadd37a5c5	390	err_t
mbed714	0:98aadd37a5c5	391	udp_send_chksum(struct udp_pcb pcb, struct pbuf p,
mbed714	0:98aadd37a5c5	392	u8_t have_chksum, u16_t chksum)
mbed714	0:98aadd37a5c5	393	{
mbed714	0:98aadd37a5c5	394	/* send to the packet using remote ip and port stored in the pcb */
mbed714	0:98aadd37a5c5	395	return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
mbed714	0:98aadd37a5c5	396	have_chksum, chksum);
mbed714	0:98aadd37a5c5	397	}
mbed714	0:98aadd37a5c5	398	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:98aadd37a5c5	399
mbed714	0:98aadd37a5c5	400	/**
mbed714	0:98aadd37a5c5	401	* Send data to a specified address using UDP.
mbed714	0:98aadd37a5c5	402	*
mbed714	0:98aadd37a5c5	403	* @param pcb UDP PCB used to send the data.
mbed714	0:98aadd37a5c5	404	* @param p chain of pbuf's to be sent.
mbed714	0:98aadd37a5c5	405	* @param dst_ip Destination IP address.
mbed714	0:98aadd37a5c5	406	* @param dst_port Destination UDP port.
mbed714	0:98aadd37a5c5	407	*
mbed714	0:98aadd37a5c5	408	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
mbed714	0:98aadd37a5c5	409	*
mbed714	0:98aadd37a5c5	410	* If the PCB already has a remote address association, it will
mbed714	0:98aadd37a5c5	411	* be restored after the data is sent.
mbed714	0:98aadd37a5c5	412	*
mbed714	0:98aadd37a5c5	413	* @return lwIP error code (@see udp_send for possible error codes)
mbed714	0:98aadd37a5c5	414	*
mbed714	0:98aadd37a5c5	415	* @see udp_disconnect() udp_send()
mbed714	0:98aadd37a5c5	416	*/
mbed714	0:98aadd37a5c5	417	err_t
mbed714	0:98aadd37a5c5	418	udp_sendto(struct udp_pcb pcb, struct pbuf p,
mbed714	0:98aadd37a5c5	419	ip_addr_t *dst_ip, u16_t dst_port)
mbed714	0:98aadd37a5c5	420	{
mbed714	0:98aadd37a5c5	421	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:98aadd37a5c5	422	return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
mbed714	0:98aadd37a5c5	423	}
mbed714	0:98aadd37a5c5	424
mbed714	0:98aadd37a5c5	425	/** Same as udp_sendto(), but with checksum */
mbed714	0:98aadd37a5c5	426	err_t
mbed714	0:98aadd37a5c5	427	udp_sendto_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
mbed714	0:98aadd37a5c5	428	u16_t dst_port, u8_t have_chksum, u16_t chksum)
mbed714	0:98aadd37a5c5	429	{
mbed714	0:98aadd37a5c5	430	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:98aadd37a5c5	431	struct netif *netif;
mbed714	0:98aadd37a5c5	432
mbed714	0:98aadd37a5c5	433	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send\n"));
mbed714	0:98aadd37a5c5	434
mbed714	0:98aadd37a5c5	435	/* find the outgoing network interface for this packet */
mbed714	0:98aadd37a5c5	436	#if LWIP_IGMP
mbed714	0:98aadd37a5c5	437	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
mbed714	0:98aadd37a5c5	438	#else
mbed714	0:98aadd37a5c5	439	netif = ip_route(dst_ip);
mbed714	0:98aadd37a5c5	440	#endif /* LWIP_IGMP */
mbed714	0:98aadd37a5c5	441
mbed714	0:98aadd37a5c5	442	/* no outgoing network interface could be found? */
mbed714	0:98aadd37a5c5	443	if (netif == NULL) {
mbed714	0:98aadd37a5c5	444	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed714	0:98aadd37a5c5	445	ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
mbed714	0:98aadd37a5c5	446	UDP_STATS_INC(udp.rterr);
mbed714	0:98aadd37a5c5	447	return ERR_RTE;
mbed714	0:98aadd37a5c5	448	}
mbed714	0:98aadd37a5c5	449	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:98aadd37a5c5	450	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
mbed714	0:98aadd37a5c5	451	#else /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:98aadd37a5c5	452	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
mbed714	0:98aadd37a5c5	453	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:98aadd37a5c5	454	}
mbed714	0:98aadd37a5c5	455
mbed714	0:98aadd37a5c5	456	/**
mbed714	0:98aadd37a5c5	457	* Send data to a specified address using UDP.
mbed714	0:98aadd37a5c5	458	* The netif used for sending can be specified.
mbed714	0:98aadd37a5c5	459	*
mbed714	0:98aadd37a5c5	460	* This function exists mainly for DHCP, to be able to send UDP packets
mbed714	0:98aadd37a5c5	461	* on a netif that is still down.
mbed714	0:98aadd37a5c5	462	*
mbed714	0:98aadd37a5c5	463	* @param pcb UDP PCB used to send the data.
mbed714	0:98aadd37a5c5	464	* @param p chain of pbuf's to be sent.
mbed714	0:98aadd37a5c5	465	* @param dst_ip Destination IP address.
mbed714	0:98aadd37a5c5	466	* @param dst_port Destination UDP port.
mbed714	0:98aadd37a5c5	467	* @param netif the netif used for sending.
mbed714	0:98aadd37a5c5	468	*
mbed714	0:98aadd37a5c5	469	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
mbed714	0:98aadd37a5c5	470	*
mbed714	0:98aadd37a5c5	471	* @return lwIP error code (@see udp_send for possible error codes)
mbed714	0:98aadd37a5c5	472	*
mbed714	0:98aadd37a5c5	473	* @see udp_disconnect() udp_send()
mbed714	0:98aadd37a5c5	474	*/
mbed714	0:98aadd37a5c5	475	err_t
mbed714	0:98aadd37a5c5	476	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
mbed714	0:98aadd37a5c5	477	ip_addr_t dst_ip, u16_t dst_port, struct netif netif)
mbed714	0:98aadd37a5c5	478	{
mbed714	0:98aadd37a5c5	479	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:98aadd37a5c5	480	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
mbed714	0:98aadd37a5c5	481	}
mbed714	0:98aadd37a5c5	482
mbed714	0:98aadd37a5c5	483	/** Same as udp_sendto_if(), but with checksum */
mbed714	0:98aadd37a5c5	484	err_t
mbed714	0:98aadd37a5c5	485	udp_sendto_if_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
mbed714	0:98aadd37a5c5	486	u16_t dst_port, struct netif *netif, u8_t have_chksum,
mbed714	0:98aadd37a5c5	487	u16_t chksum)
mbed714	0:98aadd37a5c5	488	{
mbed714	0:98aadd37a5c5	489	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:98aadd37a5c5	490	struct udp_hdr *udphdr;
mbed714	0:98aadd37a5c5	491	ip_addr_t *src_ip;
mbed714	0:98aadd37a5c5	492	err_t err;
mbed714	0:98aadd37a5c5	493	struct pbuf q; / q will be sent down the stack */
mbed714	0:98aadd37a5c5	494
mbed714	0:98aadd37a5c5	495	#if IP_SOF_BROADCAST
mbed714	0:98aadd37a5c5	496	/* broadcast filter? */
mbed714	0:98aadd37a5c5	497	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
mbed714	0:98aadd37a5c5	498	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:98aadd37a5c5	499	("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
mbed714	0:98aadd37a5c5	500	return ERR_VAL;
mbed714	0:98aadd37a5c5	501	}
mbed714	0:98aadd37a5c5	502	#endif /* IP_SOF_BROADCAST */
mbed714	0:98aadd37a5c5	503
mbed714	0:98aadd37a5c5	504	/* if the PCB is not yet bound to a port, bind it here */
mbed714	0:98aadd37a5c5	505	if (pcb->local_port == 0) {
mbed714	0:98aadd37a5c5	506	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
mbed714	0:98aadd37a5c5	507	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
mbed714	0:98aadd37a5c5	508	if (err != ERR_OK) {
mbed714	0:98aadd37a5c5	509	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
mbed714	0:98aadd37a5c5	510	return err;
mbed714	0:98aadd37a5c5	511	}
mbed714	0:98aadd37a5c5	512	}
mbed714	0:98aadd37a5c5	513
mbed714	0:98aadd37a5c5	514	/* not enough space to add an UDP header to first pbuf in given p chain? */
mbed714	0:98aadd37a5c5	515	if (pbuf_header(p, UDP_HLEN)) {
mbed714	0:98aadd37a5c5	516	/* allocate header in a separate new pbuf */
mbed714	0:98aadd37a5c5	517	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
mbed714	0:98aadd37a5c5	518	/* new header pbuf could not be allocated? */
mbed714	0:98aadd37a5c5	519	if (q == NULL) {
mbed714	0:98aadd37a5c5	520	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
mbed714	0:98aadd37a5c5	521	return ERR_MEM;
mbed714	0:98aadd37a5c5	522	}
mbed714	0:98aadd37a5c5	523	/* chain header q in front of given pbuf p */
mbed714	0:98aadd37a5c5	524	pbuf_chain(q, p);
mbed714	0:98aadd37a5c5	525	/* first pbuf q points to header pbuf */
mbed714	0:98aadd37a5c5	526	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:98aadd37a5c5	527	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
mbed714	0:98aadd37a5c5	528	} else {
mbed714	0:98aadd37a5c5	529	/* adding space for header within p succeeded */
mbed714	0:98aadd37a5c5	530	/* first pbuf q equals given pbuf */
mbed714	0:98aadd37a5c5	531	q = p;
mbed714	0:98aadd37a5c5	532	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
mbed714	0:98aadd37a5c5	533	}
mbed714	0:98aadd37a5c5	534	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
mbed714	0:98aadd37a5c5	535	(q->len >= sizeof(struct udp_hdr)));
mbed714	0:98aadd37a5c5	536	/* q now represents the packet to be sent */
mbed714	0:98aadd37a5c5	537	udphdr = (struct udp_hdr *)q->payload;
mbed714	0:98aadd37a5c5	538	udphdr->src = htons(pcb->local_port);
mbed714	0:98aadd37a5c5	539	udphdr->dest = htons(dst_port);
mbed714	0:98aadd37a5c5	540	/* in UDP, 0 checksum means 'no checksum' */
mbed714	0:98aadd37a5c5	541	udphdr->chksum = 0x0000;
mbed714	0:98aadd37a5c5	542
mbed714	0:98aadd37a5c5	543	/* Multicast Loop? */
mbed714	0:98aadd37a5c5	544	#if LWIP_IGMP
mbed714	0:98aadd37a5c5	545	if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
mbed714	0:98aadd37a5c5	546	q->flags \|= PBUF_FLAG_MCASTLOOP;
mbed714	0:98aadd37a5c5	547	}
mbed714	0:98aadd37a5c5	548	#endif /* LWIP_IGMP */
mbed714	0:98aadd37a5c5	549
mbed714	0:98aadd37a5c5	550
mbed714	0:98aadd37a5c5	551	/* PCB local address is IP_ANY_ADDR? */
mbed714	0:98aadd37a5c5	552	if (ip_addr_isany(&pcb->local_ip)) {
mbed714	0:98aadd37a5c5	553	/* use outgoing network interface IP address as source address */
mbed714	0:98aadd37a5c5	554	src_ip = &(netif->ip_addr);
mbed714	0:98aadd37a5c5	555	} else {
mbed714	0:98aadd37a5c5	556	/* check if UDP PCB local IP address is correct
mbed714	0:98aadd37a5c5	557	* this could be an old address if netif->ip_addr has changed */
mbed714	0:98aadd37a5c5	558	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
mbed714	0:98aadd37a5c5	559	/* local_ip doesn't match, drop the packet */
mbed714	0:98aadd37a5c5	560	if (q != p) {
mbed714	0:98aadd37a5c5	561	/* free the header pbuf */
mbed714	0:98aadd37a5c5	562	pbuf_free(q);
mbed714	0:98aadd37a5c5	563	q = NULL;
mbed714	0:98aadd37a5c5	564	/* p is still referenced by the caller, and will live on */
mbed714	0:98aadd37a5c5	565	}
mbed714	0:98aadd37a5c5	566	return ERR_VAL;
mbed714	0:98aadd37a5c5	567	}
mbed714	0:98aadd37a5c5	568	/* use UDP PCB local IP address as source address */
mbed714	0:98aadd37a5c5	569	src_ip = &(pcb->local_ip);
mbed714	0:98aadd37a5c5	570	}
mbed714	0:98aadd37a5c5	571
mbed714	0:98aadd37a5c5	572	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
mbed714	0:98aadd37a5c5	573
mbed714	0:98aadd37a5c5	574	#if LWIP_UDPLITE
mbed714	0:98aadd37a5c5	575	/* UDP Lite protocol? */
mbed714	0:98aadd37a5c5	576	if (pcb->flags & UDP_FLAGS_UDPLITE) {
mbed714	0:98aadd37a5c5	577	u16_t chklen, chklen_hdr;
mbed714	0:98aadd37a5c5	578	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
mbed714	0:98aadd37a5c5	579	/* set UDP message length in UDP header */
mbed714	0:98aadd37a5c5	580	chklen_hdr = chklen = pcb->chksum_len_tx;
mbed714	0:98aadd37a5c5	581	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
mbed714	0:98aadd37a5c5	582	if (chklen != 0) {
mbed714	0:98aadd37a5c5	583	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
mbed714	0:98aadd37a5c5	584	}
mbed714	0:98aadd37a5c5	585	/* For UDP-Lite, checksum length of 0 means checksum
mbed714	0:98aadd37a5c5	586	over the complete packet. (See RFC 3828 chap. 3.1)
mbed714	0:98aadd37a5c5	587	At least the UDP-Lite header must be covered by the
mbed714	0:98aadd37a5c5	588	checksum, therefore, if chksum_len has an illegal
mbed714	0:98aadd37a5c5	589	value, we generate the checksum over the complete
mbed714	0:98aadd37a5c5	590	packet to be safe. */
mbed714	0:98aadd37a5c5	591	chklen_hdr = 0;
mbed714	0:98aadd37a5c5	592	chklen = q->tot_len;
mbed714	0:98aadd37a5c5	593	}
mbed714	0:98aadd37a5c5	594	udphdr->len = htons(chklen_hdr);
mbed714	0:98aadd37a5c5	595	/* calculate checksum */
mbed714	0:98aadd37a5c5	596	#if CHECKSUM_GEN_UDP
mbed714	0:98aadd37a5c5	597	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
mbed714	0:98aadd37a5c5	598	IP_PROTO_UDPLITE, q->tot_len,
mbed714	0:98aadd37a5c5	599	#if !LWIP_CHECKSUM_ON_COPY
mbed714	0:98aadd37a5c5	600	chklen);
mbed714	0:98aadd37a5c5	601	#else /* !LWIP_CHECKSUM_ON_COPY */
mbed714	0:98aadd37a5c5	602	(have_chksum ? UDP_HLEN : chklen));
mbed714	0:98aadd37a5c5	603	if (have_chksum) {
mbed714	0:98aadd37a5c5	604	u32_t acc;
mbed714	0:98aadd37a5c5	605	acc = udphdr->chksum + (u16_t)~(chksum);
mbed714	0:98aadd37a5c5	606	udphdr->chksum = FOLD_U32T(acc);
mbed714	0:98aadd37a5c5	607	}
mbed714	0:98aadd37a5c5	608	#endif /* !LWIP_CHECKSUM_ON_COPY */
mbed714	0:98aadd37a5c5	609
mbed714	0:98aadd37a5c5	610	/* chksum zero must become 0xffff, as zero means 'no checksum' */
mbed714	0:98aadd37a5c5	611	if (udphdr->chksum == 0x0000) {
mbed714	0:98aadd37a5c5	612	udphdr->chksum = 0xffff;
mbed714	0:98aadd37a5c5	613	}
mbed714	0:98aadd37a5c5	614	#endif /* CHECKSUM_GEN_UDP */
mbed714	0:98aadd37a5c5	615	/* output to IP */
mbed714	0:98aadd37a5c5	616	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
mbed714	0:98aadd37a5c5	617	#if LWIP_NETIF_HWADDRHINT
mbed714	0:98aadd37a5c5	618	netif->addr_hint = &(pcb->addr_hint);
mbed714	0:98aadd37a5c5	619	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:98aadd37a5c5	620	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
mbed714	0:98aadd37a5c5	621	#if LWIP_NETIF_HWADDRHINT
mbed714	0:98aadd37a5c5	622	netif->addr_hint = NULL;
mbed714	0:98aadd37a5c5	623	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:98aadd37a5c5	624	} else
mbed714	0:98aadd37a5c5	625	#endif /* LWIP_UDPLITE */
mbed714	0:98aadd37a5c5	626	{ /* UDP */
mbed714	0:98aadd37a5c5	627	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
mbed714	0:98aadd37a5c5	628	udphdr->len = htons(q->tot_len);
mbed714	0:98aadd37a5c5	629	/* calculate checksum */
mbed714	0:98aadd37a5c5	630	#if CHECKSUM_GEN_UDP
mbed714	0:98aadd37a5c5	631	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
mbed714	0:98aadd37a5c5	632	u16_t udpchksum;
mbed714	0:98aadd37a5c5	633	#if LWIP_CHECKSUM_ON_COPY
mbed714	0:98aadd37a5c5	634	if (have_chksum) {
mbed714	0:98aadd37a5c5	635	u32_t acc;
mbed714	0:98aadd37a5c5	636	udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
mbed714	0:98aadd37a5c5	637	q->tot_len, UDP_HLEN);
mbed714	0:98aadd37a5c5	638	acc = udpchksum + (u16_t)~(chksum);
mbed714	0:98aadd37a5c5	639	udpchksum = FOLD_U32T(acc);
mbed714	0:98aadd37a5c5	640	} else
mbed714	0:98aadd37a5c5	641	#endif /* LWIP_CHECKSUM_ON_COPY */
mbed714	0:98aadd37a5c5	642	{
mbed714	0:98aadd37a5c5	643	udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
mbed714	0:98aadd37a5c5	644	}
mbed714	0:98aadd37a5c5	645
mbed714	0:98aadd37a5c5	646	/* chksum zero must become 0xffff, as zero means 'no checksum' */
mbed714	0:98aadd37a5c5	647	if (udpchksum == 0x0000) {
mbed714	0:98aadd37a5c5	648	udpchksum = 0xffff;
mbed714	0:98aadd37a5c5	649	}
mbed714	0:98aadd37a5c5	650	udphdr->chksum = udpchksum;
mbed714	0:98aadd37a5c5	651	}
mbed714	0:98aadd37a5c5	652	#endif /* CHECKSUM_GEN_UDP */
mbed714	0:98aadd37a5c5	653	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
mbed714	0:98aadd37a5c5	654	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
mbed714	0:98aadd37a5c5	655	/* output to IP */
mbed714	0:98aadd37a5c5	656	#if LWIP_NETIF_HWADDRHINT
mbed714	0:98aadd37a5c5	657	netif->addr_hint = &(pcb->addr_hint);
mbed714	0:98aadd37a5c5	658	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:98aadd37a5c5	659	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
mbed714	0:98aadd37a5c5	660	#if LWIP_NETIF_HWADDRHINT
mbed714	0:98aadd37a5c5	661	netif->addr_hint = NULL;
mbed714	0:98aadd37a5c5	662	#endif /* LWIP_NETIF_HWADDRHINT*/
mbed714	0:98aadd37a5c5	663	}
mbed714	0:98aadd37a5c5	664	/* TODO: must this be increased even if error occured? */
mbed714	0:98aadd37a5c5	665	snmp_inc_udpoutdatagrams();
mbed714	0:98aadd37a5c5	666
mbed714	0:98aadd37a5c5	667	/* did we chain a separate header pbuf earlier? */
mbed714	0:98aadd37a5c5	668	if (q != p) {
mbed714	0:98aadd37a5c5	669	/* free the header pbuf */
mbed714	0:98aadd37a5c5	670	pbuf_free(q);
mbed714	0:98aadd37a5c5	671	q = NULL;
mbed714	0:98aadd37a5c5	672	/* p is still referenced by the caller, and will live on */
mbed714	0:98aadd37a5c5	673	}
mbed714	0:98aadd37a5c5	674
mbed714	0:98aadd37a5c5	675	UDP_STATS_INC(udp.xmit);
mbed714	0:98aadd37a5c5	676	return err;
mbed714	0:98aadd37a5c5	677	}
mbed714	0:98aadd37a5c5	678
mbed714	0:98aadd37a5c5	679	/**
mbed714	0:98aadd37a5c5	680	* Bind an UDP PCB.
mbed714	0:98aadd37a5c5	681	*
mbed714	0:98aadd37a5c5	682	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
mbed714	0:98aadd37a5c5	683	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
mbed714	0:98aadd37a5c5	684	* bind to all local interfaces.
mbed714	0:98aadd37a5c5	685	* @param port local UDP port to bind with. Use 0 to automatically bind
mbed714	0:98aadd37a5c5	686	* to a random port between UDP_LOCAL_PORT_RANGE_START and
mbed714	0:98aadd37a5c5	687	* UDP_LOCAL_PORT_RANGE_END.
mbed714	0:98aadd37a5c5	688	*
mbed714	0:98aadd37a5c5	689	* ipaddr & port are expected to be in the same byte order as in the pcb.
mbed714	0:98aadd37a5c5	690	*
mbed714	0:98aadd37a5c5	691	* @return lwIP error code.
mbed714	0:98aadd37a5c5	692	* - ERR_OK. Successful. No error occured.
mbed714	0:98aadd37a5c5	693	* - ERR_USE. The specified ipaddr and port are already bound to by
mbed714	0:98aadd37a5c5	694	* another UDP PCB.
mbed714	0:98aadd37a5c5	695	*
mbed714	0:98aadd37a5c5	696	* @see udp_disconnect()
mbed714	0:98aadd37a5c5	697	*/
mbed714	0:98aadd37a5c5	698	err_t
mbed714	0:98aadd37a5c5	699	udp_bind(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
mbed714	0:98aadd37a5c5	700	{
mbed714	0:98aadd37a5c5	701	struct udp_pcb *ipcb;
mbed714	0:98aadd37a5c5	702	u8_t rebind;
mbed714	0:98aadd37a5c5	703
mbed714	0:98aadd37a5c5	704	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
mbed714	0:98aadd37a5c5	705	ip_addr_debug_print(UDP_DEBUG, ipaddr);
mbed714	0:98aadd37a5c5	706	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
mbed714	0:98aadd37a5c5	707
mbed714	0:98aadd37a5c5	708	rebind = 0;
mbed714	0:98aadd37a5c5	709	/* Check for double bind and rebind of the same pcb */
mbed714	0:98aadd37a5c5	710	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
mbed714	0:98aadd37a5c5	711	/* is this UDP PCB already on active list? */
mbed714	0:98aadd37a5c5	712	if (pcb == ipcb) {
mbed714	0:98aadd37a5c5	713	/* pcb may occur at most once in active list */
mbed714	0:98aadd37a5c5	714	LWIP_ASSERT("rebind == 0", rebind == 0);
mbed714	0:98aadd37a5c5	715	/* pcb already in list, just rebind */
mbed714	0:98aadd37a5c5	716	rebind = 1;
mbed714	0:98aadd37a5c5	717	}
mbed714	0:98aadd37a5c5	718
mbed714	0:98aadd37a5c5	719	/* By default, we don't allow to bind to a port that any other udp
mbed714	0:98aadd37a5c5	720	PCB is alread bound to, unless all PCBs with that port have tha
mbed714	0:98aadd37a5c5	721	REUSEADDR flag set. */
mbed714	0:98aadd37a5c5	722	#if SO_REUSE
mbed714	0:98aadd37a5c5	723	else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
mbed714	0:98aadd37a5c5	724	((ipcb->so_options & SOF_REUSEADDR) == 0)) {
mbed714	0:98aadd37a5c5	725	#else /* SO_REUSE */
mbed714	0:98aadd37a5c5	726	/* port matches that of PCB in list and REUSEADDR not set -> reject */
mbed714	0:98aadd37a5c5	727	else {
mbed714	0:98aadd37a5c5	728	#endif /* SO_REUSE */
mbed714	0:98aadd37a5c5	729	if ((ipcb->local_port == port) &&
mbed714	0:98aadd37a5c5	730	/* IP address matches, or one is IP_ADDR_ANY? */
mbed714	0:98aadd37a5c5	731	(ip_addr_isany(&(ipcb->local_ip)) \|\|
mbed714	0:98aadd37a5c5	732	ip_addr_isany(ipaddr) \|\|
mbed714	0:98aadd37a5c5	733	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
mbed714	0:98aadd37a5c5	734	/* other PCB already binds to this local IP and port */
mbed714	0:98aadd37a5c5	735	LWIP_DEBUGF(UDP_DEBUG,
mbed714	0:98aadd37a5c5	736	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
mbed714	0:98aadd37a5c5	737	return ERR_USE;
mbed714	0:98aadd37a5c5	738	}
mbed714	0:98aadd37a5c5	739	}
mbed714	0:98aadd37a5c5	740	}
mbed714	0:98aadd37a5c5	741
mbed714	0:98aadd37a5c5	742	ip_addr_set(&pcb->local_ip, ipaddr);
mbed714	0:98aadd37a5c5	743
mbed714	0:98aadd37a5c5	744	/* no port specified? */
mbed714	0:98aadd37a5c5	745	if (port == 0) {
mbed714	0:98aadd37a5c5	746	#ifndef UDP_LOCAL_PORT_RANGE_START
mbed714	0:98aadd37a5c5	747	#define UDP_LOCAL_PORT_RANGE_START 4096
mbed714	0:98aadd37a5c5	748	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
mbed714	0:98aadd37a5c5	749	#endif
mbed714	0:98aadd37a5c5	750	port = UDP_LOCAL_PORT_RANGE_START;
mbed714	0:98aadd37a5c5	751	ipcb = udp_pcbs;
mbed714	0:98aadd37a5c5	752	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
mbed714	0:98aadd37a5c5	753	if (ipcb->local_port == port) {
mbed714	0:98aadd37a5c5	754	/* port is already used by another udp_pcb */
mbed714	0:98aadd37a5c5	755	port++;
mbed714	0:98aadd37a5c5	756	/* restart scanning all udp pcbs */
mbed714	0:98aadd37a5c5	757	ipcb = udp_pcbs;
mbed714	0:98aadd37a5c5	758	} else {
mbed714	0:98aadd37a5c5	759	/* go on with next udp pcb */
mbed714	0:98aadd37a5c5	760	ipcb = ipcb->next;
mbed714	0:98aadd37a5c5	761	}
mbed714	0:98aadd37a5c5	762	}
mbed714	0:98aadd37a5c5	763	if (ipcb != NULL) {
mbed714	0:98aadd37a5c5	764	/* no more ports available in local range */
mbed714	0:98aadd37a5c5	765	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
mbed714	0:98aadd37a5c5	766	return ERR_USE;
mbed714	0:98aadd37a5c5	767	}
mbed714	0:98aadd37a5c5	768	}
mbed714	0:98aadd37a5c5	769	pcb->local_port = port;
mbed714	0:98aadd37a5c5	770	snmp_insert_udpidx_tree(pcb);
mbed714	0:98aadd37a5c5	771	/* pcb not active yet? */
mbed714	0:98aadd37a5c5	772	if (rebind == 0) {
mbed714	0:98aadd37a5c5	773	/* place the PCB on the active list if not already there */
mbed714	0:98aadd37a5c5	774	pcb->next = udp_pcbs;
mbed714	0:98aadd37a5c5	775	udp_pcbs = pcb;
mbed714	0:98aadd37a5c5	776	}
mbed714	0:98aadd37a5c5	777	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
mbed714	0:98aadd37a5c5	778	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
mbed714	0:98aadd37a5c5	779	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed714	0:98aadd37a5c5	780	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
mbed714	0:98aadd37a5c5	781	pcb->local_port));
mbed714	0:98aadd37a5c5	782	return ERR_OK;
mbed714	0:98aadd37a5c5	783	}
mbed714	0:98aadd37a5c5	784	/**
mbed714	0:98aadd37a5c5	785	* Connect an UDP PCB.
mbed714	0:98aadd37a5c5	786	*
mbed714	0:98aadd37a5c5	787	* This will associate the UDP PCB with the remote address.
mbed714	0:98aadd37a5c5	788	*
mbed714	0:98aadd37a5c5	789	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
mbed714	0:98aadd37a5c5	790	* @param ipaddr remote IP address to connect with.
mbed714	0:98aadd37a5c5	791	* @param port remote UDP port to connect with.
mbed714	0:98aadd37a5c5	792	*
mbed714	0:98aadd37a5c5	793	* @return lwIP error code
mbed714	0:98aadd37a5c5	794	*
mbed714	0:98aadd37a5c5	795	* ipaddr & port are expected to be in the same byte order as in the pcb.
mbed714	0:98aadd37a5c5	796	*
mbed714	0:98aadd37a5c5	797	* The udp pcb is bound to a random local port if not already bound.
mbed714	0:98aadd37a5c5	798	*
mbed714	0:98aadd37a5c5	799	* @see udp_disconnect()
mbed714	0:98aadd37a5c5	800	*/
mbed714	0:98aadd37a5c5	801	err_t
mbed714	0:98aadd37a5c5	802	udp_connect(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
mbed714	0:98aadd37a5c5	803	{
mbed714	0:98aadd37a5c5	804	struct udp_pcb *ipcb;
mbed714	0:98aadd37a5c5	805
mbed714	0:98aadd37a5c5	806	if (pcb->local_port == 0) {
mbed714	0:98aadd37a5c5	807	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
mbed714	0:98aadd37a5c5	808	if (err != ERR_OK) {
mbed714	0:98aadd37a5c5	809	return err;
mbed714	0:98aadd37a5c5	810	}
mbed714	0:98aadd37a5c5	811	}
mbed714	0:98aadd37a5c5	812
mbed714	0:98aadd37a5c5	813	ip_addr_set(&pcb->remote_ip, ipaddr);
mbed714	0:98aadd37a5c5	814	pcb->remote_port = port;
mbed714	0:98aadd37a5c5	815	pcb->flags \|= UDP_FLAGS_CONNECTED;
mbed714	0:98aadd37a5c5	816	/** TODO: this functionality belongs in upper layers */
mbed714	0:98aadd37a5c5	817	#ifdef LWIP_UDP_TODO
mbed714	0:98aadd37a5c5	818	/* Nail down local IP for netconn_addr()/getsockname() */
mbed714	0:98aadd37a5c5	819	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
mbed714	0:98aadd37a5c5	820	struct netif *netif;
mbed714	0:98aadd37a5c5	821
mbed714	0:98aadd37a5c5	822	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
mbed714	0:98aadd37a5c5	823	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
mbed714	0:98aadd37a5c5	824	UDP_STATS_INC(udp.rterr);
mbed714	0:98aadd37a5c5	825	return ERR_RTE;
mbed714	0:98aadd37a5c5	826	}
mbed714	0:98aadd37a5c5	827	/** TODO: this will bind the udp pcb locally, to the interface which
mbed714	0:98aadd37a5c5	828	is used to route output packets to the remote address. However, we
mbed714	0:98aadd37a5c5	829	might want to accept incoming packets on any interface! */
mbed714	0:98aadd37a5c5	830	pcb->local_ip = netif->ip_addr;
mbed714	0:98aadd37a5c5	831	} else if (ip_addr_isany(&pcb->remote_ip)) {
mbed714	0:98aadd37a5c5	832	pcb->local_ip.addr = 0;
mbed714	0:98aadd37a5c5	833	}
mbed714	0:98aadd37a5c5	834	#endif
mbed714	0:98aadd37a5c5	835	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
mbed714	0:98aadd37a5c5	836	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
mbed714	0:98aadd37a5c5	837	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
mbed714	0:98aadd37a5c5	838	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
mbed714	0:98aadd37a5c5	839	pcb->local_port));
mbed714	0:98aadd37a5c5	840
mbed714	0:98aadd37a5c5	841	/* Insert UDP PCB into the list of active UDP PCBs. */
mbed714	0:98aadd37a5c5	842	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
mbed714	0:98aadd37a5c5	843	if (pcb == ipcb) {
mbed714	0:98aadd37a5c5	844	/* already on the list, just return */
mbed714	0:98aadd37a5c5	845	return ERR_OK;
mbed714	0:98aadd37a5c5	846	}
mbed714	0:98aadd37a5c5	847	}
mbed714	0:98aadd37a5c5	848	/* PCB not yet on the list, add PCB now */
mbed714	0:98aadd37a5c5	849	pcb->next = udp_pcbs;
mbed714	0:98aadd37a5c5	850	udp_pcbs = pcb;
mbed714	0:98aadd37a5c5	851	return ERR_OK;
mbed714	0:98aadd37a5c5	852	}
mbed714	0:98aadd37a5c5	853
mbed714	0:98aadd37a5c5	854	/**
mbed714	0:98aadd37a5c5	855	* Disconnect a UDP PCB
mbed714	0:98aadd37a5c5	856	*
mbed714	0:98aadd37a5c5	857	* @param pcb the udp pcb to disconnect.
mbed714	0:98aadd37a5c5	858	*/
mbed714	0:98aadd37a5c5	859	void
mbed714	0:98aadd37a5c5	860	udp_disconnect(struct udp_pcb *pcb)
mbed714	0:98aadd37a5c5	861	{
mbed714	0:98aadd37a5c5	862	/* reset remote address association */
mbed714	0:98aadd37a5c5	863	ip_addr_set_any(&pcb->remote_ip);
mbed714	0:98aadd37a5c5	864	pcb->remote_port = 0;
mbed714	0:98aadd37a5c5	865	/* mark PCB as unconnected */
mbed714	0:98aadd37a5c5	866	pcb->flags &= ~UDP_FLAGS_CONNECTED;
mbed714	0:98aadd37a5c5	867	}
mbed714	0:98aadd37a5c5	868
mbed714	0:98aadd37a5c5	869	/**
mbed714	0:98aadd37a5c5	870	* Set a receive callback for a UDP PCB
mbed714	0:98aadd37a5c5	871	*
mbed714	0:98aadd37a5c5	872	* This callback will be called when receiving a datagram for the pcb.
mbed714	0:98aadd37a5c5	873	*
mbed714	0:98aadd37a5c5	874	* @param pcb the pcb for wich to set the recv callback
mbed714	0:98aadd37a5c5	875	* @param recv function pointer of the callback function
mbed714	0:98aadd37a5c5	876	* @param recv_arg additional argument to pass to the callback function
mbed714	0:98aadd37a5c5	877	*/
mbed714	0:98aadd37a5c5	878	void
mbed714	0:98aadd37a5c5	879	udp_recv(struct udp_pcb pcb, udp_recv_fn recv, void recv_arg)
mbed714	0:98aadd37a5c5	880	{
mbed714	0:98aadd37a5c5	881	/* remember recv() callback and user data */
mbed714	0:98aadd37a5c5	882	pcb->recv = recv;
mbed714	0:98aadd37a5c5	883	pcb->recv_arg = recv_arg;
mbed714	0:98aadd37a5c5	884	}
mbed714	0:98aadd37a5c5	885
mbed714	0:98aadd37a5c5	886	/**
mbed714	0:98aadd37a5c5	887	* Remove an UDP PCB.
mbed714	0:98aadd37a5c5	888	*
mbed714	0:98aadd37a5c5	889	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
mbed714	0:98aadd37a5c5	890	* UDP PCB's and the data structure is freed from memory.
mbed714	0:98aadd37a5c5	891	*
mbed714	0:98aadd37a5c5	892	* @see udp_new()
mbed714	0:98aadd37a5c5	893	*/
mbed714	0:98aadd37a5c5	894	void
mbed714	0:98aadd37a5c5	895	udp_remove(struct udp_pcb *pcb)
mbed714	0:98aadd37a5c5	896	{
mbed714	0:98aadd37a5c5	897	struct udp_pcb *pcb2;
mbed714	0:98aadd37a5c5	898
mbed714	0:98aadd37a5c5	899	snmp_delete_udpidx_tree(pcb);
mbed714	0:98aadd37a5c5	900	/* pcb to be removed is first in list? */
mbed714	0:98aadd37a5c5	901	if (udp_pcbs == pcb) {
mbed714	0:98aadd37a5c5	902	/* make list start at 2nd pcb */
mbed714	0:98aadd37a5c5	903	udp_pcbs = udp_pcbs->next;
mbed714	0:98aadd37a5c5	904	/* pcb not 1st in list */
mbed714	0:98aadd37a5c5	905	} else {
mbed714	0:98aadd37a5c5	906	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
mbed714	0:98aadd37a5c5	907	/* find pcb in udp_pcbs list */
mbed714	0:98aadd37a5c5	908	if (pcb2->next != NULL && pcb2->next == pcb) {
mbed714	0:98aadd37a5c5	909	/* remove pcb from list */
mbed714	0:98aadd37a5c5	910	pcb2->next = pcb->next;
mbed714	0:98aadd37a5c5	911	}
mbed714	0:98aadd37a5c5	912	}
mbed714	0:98aadd37a5c5	913	}
mbed714	0:98aadd37a5c5	914	memp_free(MEMP_UDP_PCB, pcb);
mbed714	0:98aadd37a5c5	915	}
mbed714	0:98aadd37a5c5	916
mbed714	0:98aadd37a5c5	917	/**
mbed714	0:98aadd37a5c5	918	* Create a UDP PCB.
mbed714	0:98aadd37a5c5	919	*
mbed714	0:98aadd37a5c5	920	* @return The UDP PCB which was created. NULL if the PCB data structure
mbed714	0:98aadd37a5c5	921	* could not be allocated.
mbed714	0:98aadd37a5c5	922	*
mbed714	0:98aadd37a5c5	923	* @see udp_remove()
mbed714	0:98aadd37a5c5	924	*/
mbed714	0:98aadd37a5c5	925	struct udp_pcb *
mbed714	0:98aadd37a5c5	926	udp_new(void)
mbed714	0:98aadd37a5c5	927	{
mbed714	0:98aadd37a5c5	928	struct udp_pcb *pcb;
mbed714	0:98aadd37a5c5	929	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
mbed714	0:98aadd37a5c5	930	/* could allocate UDP PCB? */
mbed714	0:98aadd37a5c5	931	if (pcb != NULL) {
mbed714	0:98aadd37a5c5	932	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
mbed714	0:98aadd37a5c5	933	* which means checksum is generated over the whole datagram per default
mbed714	0:98aadd37a5c5	934	* (recommended as default by RFC 3828). */
mbed714	0:98aadd37a5c5	935	/* initialize PCB to all zeroes */
mbed714	0:98aadd37a5c5	936	memset(pcb, 0, sizeof(struct udp_pcb));
mbed714	0:98aadd37a5c5	937	pcb->ttl = UDP_TTL;
mbed714	0:98aadd37a5c5	938	}
mbed714	0:98aadd37a5c5	939	return pcb;
mbed714	0:98aadd37a5c5	940	}
mbed714	0:98aadd37a5c5	941
mbed714	0:98aadd37a5c5	942	#if UDP_DEBUG
mbed714	0:98aadd37a5c5	943	/**
mbed714	0:98aadd37a5c5	944	* Print UDP header information for debug purposes.
mbed714	0:98aadd37a5c5	945	*
mbed714	0:98aadd37a5c5	946	* @param udphdr pointer to the udp header in memory.
mbed714	0:98aadd37a5c5	947	*/
mbed714	0:98aadd37a5c5	948	void
mbed714	0:98aadd37a5c5	949	udp_debug_print(struct udp_hdr *udphdr)
mbed714	0:98aadd37a5c5	950	{
mbed714	0:98aadd37a5c5	951	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
mbed714	0:98aadd37a5c5	952	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:98aadd37a5c5	953	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
mbed714	0:98aadd37a5c5	954	ntohs(udphdr->src), ntohs(udphdr->dest)));
mbed714	0:98aadd37a5c5	955	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:98aadd37a5c5	956	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
mbed714	0:98aadd37a5c5	957	ntohs(udphdr->len), ntohs(udphdr->chksum)));
mbed714	0:98aadd37a5c5	958	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
mbed714	0:98aadd37a5c5	959	}
mbed714	0:98aadd37a5c5	960	#endif /* UDP_DEBUG */
mbed714	0:98aadd37a5c5	961
mbed714	0:98aadd37a5c5	962	#endif /* LWIP_UDP */

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Type:	Library
Created:	29 Sep 2010
Imports:	7
Forks:	0
Commits:	4
Dependents:	0
Dependencies:	0
Followers:	1

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lwip/core/udp.c@0:98aadd37a5c5, 2010-09-29 (annotated)

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