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NetTribute library with debug turned on in FShandler Donatien Garner -> Segundo Equipo -> this version

lwip/core/udp.c@0:281d6ff68967, 2010-11-19 (annotated)

Committer:: hexley
Date:: Fri Nov 19 01:54:45 2010 +0000
Revision:: 0:281d6ff68967

Who changed what in which revision?

User	Revision	Line number	New contents of line
hexley	0:281d6ff68967	1	/**
hexley	0:281d6ff68967	2	* @file
hexley	0:281d6ff68967	3	* User Datagram Protocol module
hexley	0:281d6ff68967	4	*
hexley	0:281d6ff68967	5	*/
hexley	0:281d6ff68967	6
hexley	0:281d6ff68967	7	/*
hexley	0:281d6ff68967	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
hexley	0:281d6ff68967	9	* All rights reserved.
hexley	0:281d6ff68967	10	*
hexley	0:281d6ff68967	11	* Redistribution and use in source and binary forms, with or without modification,
hexley	0:281d6ff68967	12	* are permitted provided that the following conditions are met:
hexley	0:281d6ff68967	13	*
hexley	0:281d6ff68967	14	* 1. Redistributions of source code must retain the above copyright notice,
hexley	0:281d6ff68967	15	* this list of conditions and the following disclaimer.
hexley	0:281d6ff68967	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
hexley	0:281d6ff68967	17	* this list of conditions and the following disclaimer in the documentation
hexley	0:281d6ff68967	18	* and/or other materials provided with the distribution.
hexley	0:281d6ff68967	19	* 3. The name of the author may not be used to endorse or promote products
hexley	0:281d6ff68967	20	* derived from this software without specific prior written permission.
hexley	0:281d6ff68967	21	*
hexley	0:281d6ff68967	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
hexley	0:281d6ff68967	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
hexley	0:281d6ff68967	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
hexley	0:281d6ff68967	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
hexley	0:281d6ff68967	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
hexley	0:281d6ff68967	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
hexley	0:281d6ff68967	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
hexley	0:281d6ff68967	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
hexley	0:281d6ff68967	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
hexley	0:281d6ff68967	31	* OF SUCH DAMAGE.
hexley	0:281d6ff68967	32	*
hexley	0:281d6ff68967	33	* This file is part of the lwIP TCP/IP stack.
hexley	0:281d6ff68967	34	*
hexley	0:281d6ff68967	35	* Author: Adam Dunkels <adam@sics.se>
hexley	0:281d6ff68967	36	*
hexley	0:281d6ff68967	37	*/
hexley	0:281d6ff68967	38
hexley	0:281d6ff68967	39
hexley	0:281d6ff68967	40	/* udp.c
hexley	0:281d6ff68967	41	*
hexley	0:281d6ff68967	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
hexley	0:281d6ff68967	43	*
hexley	0:281d6ff68967	44	*/
hexley	0:281d6ff68967	45
hexley	0:281d6ff68967	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
hexley	0:281d6ff68967	47	*/
hexley	0:281d6ff68967	48
hexley	0:281d6ff68967	49	#include "lwip/opt.h"
hexley	0:281d6ff68967	50
hexley	0:281d6ff68967	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
hexley	0:281d6ff68967	52
hexley	0:281d6ff68967	53	#include "lwip/udp.h"
hexley	0:281d6ff68967	54	#include "lwip/def.h"
hexley	0:281d6ff68967	55	#include "lwip/memp.h"
hexley	0:281d6ff68967	56	#include "lwip/inet_chksum.h"
hexley	0:281d6ff68967	57	#include "lwip/ip_addr.h"
hexley	0:281d6ff68967	58	#include "lwip/netif.h"
hexley	0:281d6ff68967	59	#include "lwip/icmp.h"
hexley	0:281d6ff68967	60	#include "lwip/stats.h"
hexley	0:281d6ff68967	61	#include "lwip/snmp.h"
hexley	0:281d6ff68967	62	#include "arch/perf.h"
hexley	0:281d6ff68967	63	#include "lwip/dhcp.h"
hexley	0:281d6ff68967	64
hexley	0:281d6ff68967	65	#include <string.h>
hexley	0:281d6ff68967	66
hexley	0:281d6ff68967	67	/* The list of UDP PCBs */
hexley	0:281d6ff68967	68	/* exported in udp.h (was static) */
hexley	0:281d6ff68967	69	struct udp_pcb *udp_pcbs;
hexley	0:281d6ff68967	70
hexley	0:281d6ff68967	71	/**
hexley	0:281d6ff68967	72	* Process an incoming UDP datagram.
hexley	0:281d6ff68967	73	*
hexley	0:281d6ff68967	74	* Given an incoming UDP datagram (as a chain of pbufs) this function
hexley	0:281d6ff68967	75	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
hexley	0:281d6ff68967	76	* recv function. If no pcb is found or the datagram is incorrect, the
hexley	0:281d6ff68967	77	* pbuf is freed.
hexley	0:281d6ff68967	78	*
hexley	0:281d6ff68967	79	* @param p pbuf to be demultiplexed to a UDP PCB.
hexley	0:281d6ff68967	80	* @param inp network interface on which the datagram was received.
hexley	0:281d6ff68967	81	*
hexley	0:281d6ff68967	82	*/
hexley	0:281d6ff68967	83	void
hexley	0:281d6ff68967	84	udp_input(struct pbuf p, struct netif inp)
hexley	0:281d6ff68967	85	{
hexley	0:281d6ff68967	86	struct udp_hdr *udphdr;
hexley	0:281d6ff68967	87	struct udp_pcb pcb, prev;
hexley	0:281d6ff68967	88	struct udp_pcb *uncon_pcb;
hexley	0:281d6ff68967	89	struct ip_hdr *iphdr;
hexley	0:281d6ff68967	90	u16_t src, dest;
hexley	0:281d6ff68967	91	u8_t local_match;
hexley	0:281d6ff68967	92	u8_t broadcast;
hexley	0:281d6ff68967	93
hexley	0:281d6ff68967	94	PERF_START;
hexley	0:281d6ff68967	95
hexley	0:281d6ff68967	96	UDP_STATS_INC(udp.recv);
hexley	0:281d6ff68967	97
hexley	0:281d6ff68967	98	iphdr = (struct ip_hdr *)p->payload;
hexley	0:281d6ff68967	99
hexley	0:281d6ff68967	100	/* Check minimum length (IP header + UDP header)
hexley	0:281d6ff68967	101	* and move payload pointer to UDP header */
hexley	0:281d6ff68967	102	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
hexley	0:281d6ff68967	103	/* drop short packets */
hexley	0:281d6ff68967	104	LWIP_DEBUGF(UDP_DEBUG,
hexley	0:281d6ff68967	105	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
hexley	0:281d6ff68967	106	UDP_STATS_INC(udp.lenerr);
hexley	0:281d6ff68967	107	UDP_STATS_INC(udp.drop);
hexley	0:281d6ff68967	108	snmp_inc_udpinerrors();
hexley	0:281d6ff68967	109	pbuf_free(p);
hexley	0:281d6ff68967	110	goto end;
hexley	0:281d6ff68967	111	}
hexley	0:281d6ff68967	112
hexley	0:281d6ff68967	113	udphdr = (struct udp_hdr *)p->payload;
hexley	0:281d6ff68967	114
hexley	0:281d6ff68967	115	/* is broadcast packet ? */
hexley	0:281d6ff68967	116	broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
hexley	0:281d6ff68967	117
hexley	0:281d6ff68967	118	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
hexley	0:281d6ff68967	119
hexley	0:281d6ff68967	120	/* convert src and dest ports to host byte order */
hexley	0:281d6ff68967	121	src = ntohs(udphdr->src);
hexley	0:281d6ff68967	122	dest = ntohs(udphdr->dest);
hexley	0:281d6ff68967	123
hexley	0:281d6ff68967	124	udp_debug_print(udphdr);
hexley	0:281d6ff68967	125
hexley	0:281d6ff68967	126	/* print the UDP source and destination */
hexley	0:281d6ff68967	127	LWIP_DEBUGF(UDP_DEBUG,
hexley	0:281d6ff68967	128	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
hexley	0:281d6ff68967	129	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
hexley	0:281d6ff68967	130	ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
hexley	0:281d6ff68967	131	ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
hexley	0:281d6ff68967	132	ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
hexley	0:281d6ff68967	133	ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
hexley	0:281d6ff68967	134
hexley	0:281d6ff68967	135	#if LWIP_DHCP
hexley	0:281d6ff68967	136	pcb = NULL;
hexley	0:281d6ff68967	137	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
hexley	0:281d6ff68967	138	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
hexley	0:281d6ff68967	139	if (dest == DHCP_CLIENT_PORT) {
hexley	0:281d6ff68967	140	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
hexley	0:281d6ff68967	141	if (src == DHCP_SERVER_PORT) {
hexley	0:281d6ff68967	142	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
hexley	0:281d6ff68967	143	/* accept the packe if
hexley	0:281d6ff68967	144	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
hexley	0:281d6ff68967	145	- inp->dhcp->pcb->remote == ANY or iphdr->src */
hexley	0:281d6ff68967	146	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
hexley	0:281d6ff68967	147	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
hexley	0:281d6ff68967	148	pcb = inp->dhcp->pcb;
hexley	0:281d6ff68967	149	}
hexley	0:281d6ff68967	150	}
hexley	0:281d6ff68967	151	}
hexley	0:281d6ff68967	152	} else
hexley	0:281d6ff68967	153	#endif /* LWIP_DHCP */
hexley	0:281d6ff68967	154	{
hexley	0:281d6ff68967	155	prev = NULL;
hexley	0:281d6ff68967	156	local_match = 0;
hexley	0:281d6ff68967	157	uncon_pcb = NULL;
hexley	0:281d6ff68967	158	/* Iterate through the UDP pcb list for a matching pcb.
hexley	0:281d6ff68967	159	* 'Perfect match' pcbs (connected to the remote port & ip address) are
hexley	0:281d6ff68967	160	* preferred. If no perfect match is found, the first unconnected pcb that
hexley	0:281d6ff68967	161	* matches the local port and ip address gets the datagram. */
hexley	0:281d6ff68967	162	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
hexley	0:281d6ff68967	163	local_match = 0;
hexley	0:281d6ff68967	164	/* print the PCB local and remote address */
hexley	0:281d6ff68967	165	LWIP_DEBUGF(UDP_DEBUG,
hexley	0:281d6ff68967	166	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
hexley	0:281d6ff68967	167	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
hexley	0:281d6ff68967	168	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
hexley	0:281d6ff68967	169	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
hexley	0:281d6ff68967	170	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
hexley	0:281d6ff68967	171	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
hexley	0:281d6ff68967	172
hexley	0:281d6ff68967	173	/* compare PCB local addr+port to UDP destination addr+port */
hexley	0:281d6ff68967	174	if ((pcb->local_port == dest) &&
hexley	0:281d6ff68967	175	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
hexley	0:281d6ff68967	176	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) \|\|
hexley	0:281d6ff68967	177	#if LWIP_IGMP
hexley	0:281d6ff68967	178	ip_addr_ismulticast(&current_iphdr_dest) \|\|
hexley	0:281d6ff68967	179	#endif /* LWIP_IGMP */
hexley	0:281d6ff68967	180	#if IP_SOF_BROADCAST_RECV
hexley	0:281d6ff68967	181	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
hexley	0:281d6ff68967	182	#else /* IP_SOF_BROADCAST_RECV */
hexley	0:281d6ff68967	183	(broadcast))) {
hexley	0:281d6ff68967	184	#endif /* IP_SOF_BROADCAST_RECV */
hexley	0:281d6ff68967	185	local_match = 1;
hexley	0:281d6ff68967	186	if ((uncon_pcb == NULL) &&
hexley	0:281d6ff68967	187	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
hexley	0:281d6ff68967	188	/* the first unconnected matching PCB */
hexley	0:281d6ff68967	189	uncon_pcb = pcb;
hexley	0:281d6ff68967	190	}
hexley	0:281d6ff68967	191	}
hexley	0:281d6ff68967	192	/* compare PCB remote addr+port to UDP source addr+port */
hexley	0:281d6ff68967	193	if ((local_match != 0) &&
hexley	0:281d6ff68967	194	(pcb->remote_port == src) &&
hexley	0:281d6ff68967	195	(ip_addr_isany(&pcb->remote_ip) \|\|
hexley	0:281d6ff68967	196	ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
hexley	0:281d6ff68967	197	/* the first fully matching PCB */
hexley	0:281d6ff68967	198	if (prev != NULL) {
hexley	0:281d6ff68967	199	/* move the pcb to the front of udp_pcbs so that is
hexley	0:281d6ff68967	200	found faster next time */
hexley	0:281d6ff68967	201	prev->next = pcb->next;
hexley	0:281d6ff68967	202	pcb->next = udp_pcbs;
hexley	0:281d6ff68967	203	udp_pcbs = pcb;
hexley	0:281d6ff68967	204	} else {
hexley	0:281d6ff68967	205	UDP_STATS_INC(udp.cachehit);
hexley	0:281d6ff68967	206	}
hexley	0:281d6ff68967	207	break;
hexley	0:281d6ff68967	208	}
hexley	0:281d6ff68967	209	prev = pcb;
hexley	0:281d6ff68967	210	}
hexley	0:281d6ff68967	211	/* no fully matching pcb found? then look for an unconnected pcb */
hexley	0:281d6ff68967	212	if (pcb == NULL) {
hexley	0:281d6ff68967	213	pcb = uncon_pcb;
hexley	0:281d6ff68967	214	}
hexley	0:281d6ff68967	215	}
hexley	0:281d6ff68967	216
hexley	0:281d6ff68967	217	/* Check checksum if this is a match or if it was directed at us. */
hexley	0:281d6ff68967	218	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
hexley	0:281d6ff68967	219	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
hexley	0:281d6ff68967	220	#if LWIP_UDPLITE
hexley	0:281d6ff68967	221	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
hexley	0:281d6ff68967	222	/* Do the UDP Lite checksum */
hexley	0:281d6ff68967	223	#if CHECKSUM_CHECK_UDP
hexley	0:281d6ff68967	224	u16_t chklen = ntohs(udphdr->len);
hexley	0:281d6ff68967	225	if (chklen < sizeof(struct udp_hdr)) {
hexley	0:281d6ff68967	226	if (chklen == 0) {
hexley	0:281d6ff68967	227	/* For UDP-Lite, checksum length of 0 means checksum
hexley	0:281d6ff68967	228	over the complete packet (See RFC 3828 chap. 3.1) */
hexley	0:281d6ff68967	229	chklen = p->tot_len;
hexley	0:281d6ff68967	230	} else {
hexley	0:281d6ff68967	231	/* At least the UDP-Lite header must be covered by the
hexley	0:281d6ff68967	232	checksum! (Again, see RFC 3828 chap. 3.1) */
hexley	0:281d6ff68967	233	UDP_STATS_INC(udp.chkerr);
hexley	0:281d6ff68967	234	UDP_STATS_INC(udp.drop);
hexley	0:281d6ff68967	235	snmp_inc_udpinerrors();
hexley	0:281d6ff68967	236	pbuf_free(p);
hexley	0:281d6ff68967	237	goto end;
hexley	0:281d6ff68967	238	}
hexley	0:281d6ff68967	239	}
hexley	0:281d6ff68967	240	if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
hexley	0:281d6ff68967	241	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
hexley	0:281d6ff68967	242	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
hexley	0:281d6ff68967	243	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
hexley	0:281d6ff68967	244	UDP_STATS_INC(udp.chkerr);
hexley	0:281d6ff68967	245	UDP_STATS_INC(udp.drop);
hexley	0:281d6ff68967	246	snmp_inc_udpinerrors();
hexley	0:281d6ff68967	247	pbuf_free(p);
hexley	0:281d6ff68967	248	goto end;
hexley	0:281d6ff68967	249	}
hexley	0:281d6ff68967	250	#endif /* CHECKSUM_CHECK_UDP */
hexley	0:281d6ff68967	251	} else
hexley	0:281d6ff68967	252	#endif /* LWIP_UDPLITE */
hexley	0:281d6ff68967	253	{
hexley	0:281d6ff68967	254	#if CHECKSUM_CHECK_UDP
hexley	0:281d6ff68967	255	if (udphdr->chksum != 0) {
hexley	0:281d6ff68967	256	if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
hexley	0:281d6ff68967	257	IP_PROTO_UDP, p->tot_len) != 0) {
hexley	0:281d6ff68967	258	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
hexley	0:281d6ff68967	259	("udp_input: UDP datagram discarded due to failing checksum\n"));
hexley	0:281d6ff68967	260	UDP_STATS_INC(udp.chkerr);
hexley	0:281d6ff68967	261	UDP_STATS_INC(udp.drop);
hexley	0:281d6ff68967	262	snmp_inc_udpinerrors();
hexley	0:281d6ff68967	263	pbuf_free(p);
hexley	0:281d6ff68967	264	goto end;
hexley	0:281d6ff68967	265	}
hexley	0:281d6ff68967	266	}
hexley	0:281d6ff68967	267	#endif /* CHECKSUM_CHECK_UDP */
hexley	0:281d6ff68967	268	}
hexley	0:281d6ff68967	269	if(pbuf_header(p, -UDP_HLEN)) {
hexley	0:281d6ff68967	270	/* Can we cope with this failing? Just assert for now */
hexley	0:281d6ff68967	271	LWIP_ASSERT("pbuf_header failed\n", 0);
hexley	0:281d6ff68967	272	UDP_STATS_INC(udp.drop);
hexley	0:281d6ff68967	273	snmp_inc_udpinerrors();
hexley	0:281d6ff68967	274	pbuf_free(p);
hexley	0:281d6ff68967	275	goto end;
hexley	0:281d6ff68967	276	}
hexley	0:281d6ff68967	277	if (pcb != NULL) {
hexley	0:281d6ff68967	278	snmp_inc_udpindatagrams();
hexley	0:281d6ff68967	279	#if SO_REUSE && SO_REUSE_RXTOALL
hexley	0:281d6ff68967	280	if ((broadcast \|\| ip_addr_ismulticast(&current_iphdr_dest)) &&
hexley	0:281d6ff68967	281	((pcb->so_options & SOF_REUSEADDR) != 0)) {
hexley	0:281d6ff68967	282	/* pass broadcast- or multicast packets to all multicast pcbs
hexley	0:281d6ff68967	283	if SOF_REUSEADDR is set on the first match */
hexley	0:281d6ff68967	284	struct udp_pcb *mpcb;
hexley	0:281d6ff68967	285	u8_t p_header_changed = 0;
hexley	0:281d6ff68967	286	for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
hexley	0:281d6ff68967	287	if (mpcb != pcb) {
hexley	0:281d6ff68967	288	/* compare PCB local addr+port to UDP destination addr+port */
hexley	0:281d6ff68967	289	if ((mpcb->local_port == dest) &&
hexley	0:281d6ff68967	290	((!broadcast && ip_addr_isany(&mpcb->local_ip)) \|\|
hexley	0:281d6ff68967	291	ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) \|\|
hexley	0:281d6ff68967	292	#if LWIP_IGMP
hexley	0:281d6ff68967	293	ip_addr_ismulticast(&current_iphdr_dest) \|\|
hexley	0:281d6ff68967	294	#endif /* LWIP_IGMP */
hexley	0:281d6ff68967	295	#if IP_SOF_BROADCAST_RECV
hexley	0:281d6ff68967	296	(broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
hexley	0:281d6ff68967	297	#else /* IP_SOF_BROADCAST_RECV */
hexley	0:281d6ff68967	298	(broadcast))) {
hexley	0:281d6ff68967	299	#endif /* IP_SOF_BROADCAST_RECV */
hexley	0:281d6ff68967	300	/* pass a copy of the packet to all local matches */
hexley	0:281d6ff68967	301	if (mpcb->recv != NULL) {
hexley	0:281d6ff68967	302	struct pbuf *q;
hexley	0:281d6ff68967	303	/* for that, move payload to IP header again */
hexley	0:281d6ff68967	304	if (p_header_changed == 0) {
hexley	0:281d6ff68967	305	pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
hexley	0:281d6ff68967	306	p_header_changed = 1;
hexley	0:281d6ff68967	307	}
hexley	0:281d6ff68967	308	q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
hexley	0:281d6ff68967	309	if (q != NULL) {
hexley	0:281d6ff68967	310	err_t err = pbuf_copy(q, p);
hexley	0:281d6ff68967	311	if (err == ERR_OK) {
hexley	0:281d6ff68967	312	/* move payload to UDP data */
hexley	0:281d6ff68967	313	pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
hexley	0:281d6ff68967	314	mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
hexley	0:281d6ff68967	315	}
hexley	0:281d6ff68967	316	}
hexley	0:281d6ff68967	317	}
hexley	0:281d6ff68967	318	}
hexley	0:281d6ff68967	319	}
hexley	0:281d6ff68967	320	}
hexley	0:281d6ff68967	321	if (p_header_changed) {
hexley	0:281d6ff68967	322	/* and move payload to UDP data again */
hexley	0:281d6ff68967	323	pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
hexley	0:281d6ff68967	324	}
hexley	0:281d6ff68967	325	}
hexley	0:281d6ff68967	326	#endif /* SO_REUSE && SO_REUSE_RXTOALL */
hexley	0:281d6ff68967	327	/* callback */
hexley	0:281d6ff68967	328	if (pcb->recv != NULL) {
hexley	0:281d6ff68967	329	/* now the recv function is responsible for freeing p */
hexley	0:281d6ff68967	330	pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
hexley	0:281d6ff68967	331	} else {
hexley	0:281d6ff68967	332	/* no recv function registered? then we have to free the pbuf! */
hexley	0:281d6ff68967	333	pbuf_free(p);
hexley	0:281d6ff68967	334	goto end;
hexley	0:281d6ff68967	335	}
hexley	0:281d6ff68967	336	} else {
hexley	0:281d6ff68967	337	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
hexley	0:281d6ff68967	338
hexley	0:281d6ff68967	339	#if LWIP_ICMP
hexley	0:281d6ff68967	340	/* No match was found, send ICMP destination port unreachable unless
hexley	0:281d6ff68967	341	destination address was broadcast/multicast. */
hexley	0:281d6ff68967	342	if (!broadcast &&
hexley	0:281d6ff68967	343	!ip_addr_ismulticast(&current_iphdr_dest)) {
hexley	0:281d6ff68967	344	/* move payload pointer back to ip header */
hexley	0:281d6ff68967	345	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
hexley	0:281d6ff68967	346	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
hexley	0:281d6ff68967	347	icmp_dest_unreach(p, ICMP_DUR_PORT);
hexley	0:281d6ff68967	348	}
hexley	0:281d6ff68967	349	#endif /* LWIP_ICMP */
hexley	0:281d6ff68967	350	UDP_STATS_INC(udp.proterr);
hexley	0:281d6ff68967	351	UDP_STATS_INC(udp.drop);
hexley	0:281d6ff68967	352	snmp_inc_udpnoports();
hexley	0:281d6ff68967	353	pbuf_free(p);
hexley	0:281d6ff68967	354	}
hexley	0:281d6ff68967	355	} else {
hexley	0:281d6ff68967	356	pbuf_free(p);
hexley	0:281d6ff68967	357	}
hexley	0:281d6ff68967	358	end:
hexley	0:281d6ff68967	359	PERF_STOP("udp_input");
hexley	0:281d6ff68967	360	}
hexley	0:281d6ff68967	361
hexley	0:281d6ff68967	362	/**
hexley	0:281d6ff68967	363	* Send data using UDP.
hexley	0:281d6ff68967	364	*
hexley	0:281d6ff68967	365	* @param pcb UDP PCB used to send the data.
hexley	0:281d6ff68967	366	* @param p chain of pbuf's to be sent.
hexley	0:281d6ff68967	367	*
hexley	0:281d6ff68967	368	* The datagram will be sent to the current remote_ip & remote_port
hexley	0:281d6ff68967	369	* stored in pcb. If the pcb is not bound to a port, it will
hexley	0:281d6ff68967	370	* automatically be bound to a random port.
hexley	0:281d6ff68967	371	*
hexley	0:281d6ff68967	372	* @return lwIP error code.
hexley	0:281d6ff68967	373	* - ERR_OK. Successful. No error occured.
hexley	0:281d6ff68967	374	* - ERR_MEM. Out of memory.
hexley	0:281d6ff68967	375	* - ERR_RTE. Could not find route to destination address.
hexley	0:281d6ff68967	376	* - More errors could be returned by lower protocol layers.
hexley	0:281d6ff68967	377	*
hexley	0:281d6ff68967	378	* @see udp_disconnect() udp_sendto()
hexley	0:281d6ff68967	379	*/
hexley	0:281d6ff68967	380	err_t
hexley	0:281d6ff68967	381	udp_send(struct udp_pcb pcb, struct pbuf p)
hexley	0:281d6ff68967	382	{
hexley	0:281d6ff68967	383	/* send to the packet using remote ip and port stored in the pcb */
hexley	0:281d6ff68967	384	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
hexley	0:281d6ff68967	385	}
hexley	0:281d6ff68967	386
hexley	0:281d6ff68967	387	#if LWIP_CHECKSUM_ON_COPY
hexley	0:281d6ff68967	388	/** Same as udp_send() but with checksum
hexley	0:281d6ff68967	389	*/
hexley	0:281d6ff68967	390	err_t
hexley	0:281d6ff68967	391	udp_send_chksum(struct udp_pcb pcb, struct pbuf p,
hexley	0:281d6ff68967	392	u8_t have_chksum, u16_t chksum)
hexley	0:281d6ff68967	393	{
hexley	0:281d6ff68967	394	/* send to the packet using remote ip and port stored in the pcb */
hexley	0:281d6ff68967	395	return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
hexley	0:281d6ff68967	396	have_chksum, chksum);
hexley	0:281d6ff68967	397	}
hexley	0:281d6ff68967	398	#endif /* LWIP_CHECKSUM_ON_COPY */
hexley	0:281d6ff68967	399
hexley	0:281d6ff68967	400	/**
hexley	0:281d6ff68967	401	* Send data to a specified address using UDP.
hexley	0:281d6ff68967	402	*
hexley	0:281d6ff68967	403	* @param pcb UDP PCB used to send the data.
hexley	0:281d6ff68967	404	* @param p chain of pbuf's to be sent.
hexley	0:281d6ff68967	405	* @param dst_ip Destination IP address.
hexley	0:281d6ff68967	406	* @param dst_port Destination UDP port.
hexley	0:281d6ff68967	407	*
hexley	0:281d6ff68967	408	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
hexley	0:281d6ff68967	409	*
hexley	0:281d6ff68967	410	* If the PCB already has a remote address association, it will
hexley	0:281d6ff68967	411	* be restored after the data is sent.
hexley	0:281d6ff68967	412	*
hexley	0:281d6ff68967	413	* @return lwIP error code (@see udp_send for possible error codes)
hexley	0:281d6ff68967	414	*
hexley	0:281d6ff68967	415	* @see udp_disconnect() udp_send()
hexley	0:281d6ff68967	416	*/
hexley	0:281d6ff68967	417	err_t
hexley	0:281d6ff68967	418	udp_sendto(struct udp_pcb pcb, struct pbuf p,
hexley	0:281d6ff68967	419	ip_addr_t *dst_ip, u16_t dst_port)
hexley	0:281d6ff68967	420	{
hexley	0:281d6ff68967	421	#if LWIP_CHECKSUM_ON_COPY
hexley	0:281d6ff68967	422	return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
hexley	0:281d6ff68967	423	}
hexley	0:281d6ff68967	424
hexley	0:281d6ff68967	425	/** Same as udp_sendto(), but with checksum */
hexley	0:281d6ff68967	426	err_t
hexley	0:281d6ff68967	427	udp_sendto_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
hexley	0:281d6ff68967	428	u16_t dst_port, u8_t have_chksum, u16_t chksum)
hexley	0:281d6ff68967	429	{
hexley	0:281d6ff68967	430	#endif /* LWIP_CHECKSUM_ON_COPY */
hexley	0:281d6ff68967	431	struct netif *netif;
hexley	0:281d6ff68967	432
hexley	0:281d6ff68967	433	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send\n"));
hexley	0:281d6ff68967	434
hexley	0:281d6ff68967	435	/* find the outgoing network interface for this packet */
hexley	0:281d6ff68967	436	#if LWIP_IGMP
hexley	0:281d6ff68967	437	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
hexley	0:281d6ff68967	438	#else
hexley	0:281d6ff68967	439	netif = ip_route(dst_ip);
hexley	0:281d6ff68967	440	#endif /* LWIP_IGMP */
hexley	0:281d6ff68967	441
hexley	0:281d6ff68967	442	/* no outgoing network interface could be found? */
hexley	0:281d6ff68967	443	if (netif == NULL) {
hexley	0:281d6ff68967	444	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
hexley	0:281d6ff68967	445	ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
hexley	0:281d6ff68967	446	UDP_STATS_INC(udp.rterr);
hexley	0:281d6ff68967	447	return ERR_RTE;
hexley	0:281d6ff68967	448	}
hexley	0:281d6ff68967	449	#if LWIP_CHECKSUM_ON_COPY
hexley	0:281d6ff68967	450	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
hexley	0:281d6ff68967	451	#else /* LWIP_CHECKSUM_ON_COPY */
hexley	0:281d6ff68967	452	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
hexley	0:281d6ff68967	453	#endif /* LWIP_CHECKSUM_ON_COPY */
hexley	0:281d6ff68967	454	}
hexley	0:281d6ff68967	455
hexley	0:281d6ff68967	456	/**
hexley	0:281d6ff68967	457	* Send data to a specified address using UDP.
hexley	0:281d6ff68967	458	* The netif used for sending can be specified.
hexley	0:281d6ff68967	459	*
hexley	0:281d6ff68967	460	* This function exists mainly for DHCP, to be able to send UDP packets
hexley	0:281d6ff68967	461	* on a netif that is still down.
hexley	0:281d6ff68967	462	*
hexley	0:281d6ff68967	463	* @param pcb UDP PCB used to send the data.
hexley	0:281d6ff68967	464	* @param p chain of pbuf's to be sent.
hexley	0:281d6ff68967	465	* @param dst_ip Destination IP address.
hexley	0:281d6ff68967	466	* @param dst_port Destination UDP port.
hexley	0:281d6ff68967	467	* @param netif the netif used for sending.
hexley	0:281d6ff68967	468	*
hexley	0:281d6ff68967	469	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
hexley	0:281d6ff68967	470	*
hexley	0:281d6ff68967	471	* @return lwIP error code (@see udp_send for possible error codes)
hexley	0:281d6ff68967	472	*
hexley	0:281d6ff68967	473	* @see udp_disconnect() udp_send()
hexley	0:281d6ff68967	474	*/
hexley	0:281d6ff68967	475	err_t
hexley	0:281d6ff68967	476	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
hexley	0:281d6ff68967	477	ip_addr_t dst_ip, u16_t dst_port, struct netif netif)
hexley	0:281d6ff68967	478	{
hexley	0:281d6ff68967	479	#if LWIP_CHECKSUM_ON_COPY
hexley	0:281d6ff68967	480	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
hexley	0:281d6ff68967	481	}
hexley	0:281d6ff68967	482
hexley	0:281d6ff68967	483	/** Same as udp_sendto_if(), but with checksum */
hexley	0:281d6ff68967	484	err_t
hexley	0:281d6ff68967	485	udp_sendto_if_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
hexley	0:281d6ff68967	486	u16_t dst_port, struct netif *netif, u8_t have_chksum,
hexley	0:281d6ff68967	487	u16_t chksum)
hexley	0:281d6ff68967	488	{
hexley	0:281d6ff68967	489	#endif /* LWIP_CHECKSUM_ON_COPY */
hexley	0:281d6ff68967	490	struct udp_hdr *udphdr;
hexley	0:281d6ff68967	491	ip_addr_t *src_ip;
hexley	0:281d6ff68967	492	err_t err;
hexley	0:281d6ff68967	493	struct pbuf q; / q will be sent down the stack */
hexley	0:281d6ff68967	494
hexley	0:281d6ff68967	495	#if IP_SOF_BROADCAST
hexley	0:281d6ff68967	496	/* broadcast filter? */
hexley	0:281d6ff68967	497	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
hexley	0:281d6ff68967	498	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
hexley	0:281d6ff68967	499	("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
hexley	0:281d6ff68967	500	return ERR_VAL;
hexley	0:281d6ff68967	501	}
hexley	0:281d6ff68967	502	#endif /* IP_SOF_BROADCAST */
hexley	0:281d6ff68967	503
hexley	0:281d6ff68967	504	/* if the PCB is not yet bound to a port, bind it here */
hexley	0:281d6ff68967	505	if (pcb->local_port == 0) {
hexley	0:281d6ff68967	506	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
hexley	0:281d6ff68967	507	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
hexley	0:281d6ff68967	508	if (err != ERR_OK) {
hexley	0:281d6ff68967	509	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
hexley	0:281d6ff68967	510	return err;
hexley	0:281d6ff68967	511	}
hexley	0:281d6ff68967	512	}
hexley	0:281d6ff68967	513
hexley	0:281d6ff68967	514	/* not enough space to add an UDP header to first pbuf in given p chain? */
hexley	0:281d6ff68967	515	if (pbuf_header(p, UDP_HLEN)) {
hexley	0:281d6ff68967	516	/* allocate header in a separate new pbuf */
hexley	0:281d6ff68967	517	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
hexley	0:281d6ff68967	518	/* new header pbuf could not be allocated? */
hexley	0:281d6ff68967	519	if (q == NULL) {
hexley	0:281d6ff68967	520	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
hexley	0:281d6ff68967	521	return ERR_MEM;
hexley	0:281d6ff68967	522	}
hexley	0:281d6ff68967	523	/* chain header q in front of given pbuf p */
hexley	0:281d6ff68967	524	pbuf_chain(q, p);
hexley	0:281d6ff68967	525	/* first pbuf q points to header pbuf */
hexley	0:281d6ff68967	526	LWIP_DEBUGF(UDP_DEBUG,
hexley	0:281d6ff68967	527	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
hexley	0:281d6ff68967	528	} else {
hexley	0:281d6ff68967	529	/* adding space for header within p succeeded */
hexley	0:281d6ff68967	530	/* first pbuf q equals given pbuf */
hexley	0:281d6ff68967	531	q = p;
hexley	0:281d6ff68967	532	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
hexley	0:281d6ff68967	533	}
hexley	0:281d6ff68967	534	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
hexley	0:281d6ff68967	535	(q->len >= sizeof(struct udp_hdr)));
hexley	0:281d6ff68967	536	/* q now represents the packet to be sent */
hexley	0:281d6ff68967	537	udphdr = (struct udp_hdr *)q->payload;
hexley	0:281d6ff68967	538	udphdr->src = htons(pcb->local_port);
hexley	0:281d6ff68967	539	udphdr->dest = htons(dst_port);
hexley	0:281d6ff68967	540	/* in UDP, 0 checksum means 'no checksum' */
hexley	0:281d6ff68967	541	udphdr->chksum = 0x0000;
hexley	0:281d6ff68967	542
hexley	0:281d6ff68967	543	/* Multicast Loop? */
hexley	0:281d6ff68967	544	#if LWIP_IGMP
hexley	0:281d6ff68967	545	if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
hexley	0:281d6ff68967	546	q->flags \|= PBUF_FLAG_MCASTLOOP;
hexley	0:281d6ff68967	547	}
hexley	0:281d6ff68967	548	#endif /* LWIP_IGMP */
hexley	0:281d6ff68967	549
hexley	0:281d6ff68967	550
hexley	0:281d6ff68967	551	/* PCB local address is IP_ANY_ADDR? */
hexley	0:281d6ff68967	552	if (ip_addr_isany(&pcb->local_ip)) {
hexley	0:281d6ff68967	553	/* use outgoing network interface IP address as source address */
hexley	0:281d6ff68967	554	src_ip = &(netif->ip_addr);
hexley	0:281d6ff68967	555	} else {
hexley	0:281d6ff68967	556	/* check if UDP PCB local IP address is correct
hexley	0:281d6ff68967	557	* this could be an old address if netif->ip_addr has changed */
hexley	0:281d6ff68967	558	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
hexley	0:281d6ff68967	559	/* local_ip doesn't match, drop the packet */
hexley	0:281d6ff68967	560	if (q != p) {
hexley	0:281d6ff68967	561	/* free the header pbuf */
hexley	0:281d6ff68967	562	pbuf_free(q);
hexley	0:281d6ff68967	563	q = NULL;
hexley	0:281d6ff68967	564	/* p is still referenced by the caller, and will live on */
hexley	0:281d6ff68967	565	}
hexley	0:281d6ff68967	566	return ERR_VAL;
hexley	0:281d6ff68967	567	}
hexley	0:281d6ff68967	568	/* use UDP PCB local IP address as source address */
hexley	0:281d6ff68967	569	src_ip = &(pcb->local_ip);
hexley	0:281d6ff68967	570	}
hexley	0:281d6ff68967	571
hexley	0:281d6ff68967	572	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
hexley	0:281d6ff68967	573
hexley	0:281d6ff68967	574	#if LWIP_UDPLITE
hexley	0:281d6ff68967	575	/* UDP Lite protocol? */
hexley	0:281d6ff68967	576	if (pcb->flags & UDP_FLAGS_UDPLITE) {
hexley	0:281d6ff68967	577	u16_t chklen, chklen_hdr;
hexley	0:281d6ff68967	578	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
hexley	0:281d6ff68967	579	/* set UDP message length in UDP header */
hexley	0:281d6ff68967	580	chklen_hdr = chklen = pcb->chksum_len_tx;
hexley	0:281d6ff68967	581	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
hexley	0:281d6ff68967	582	if (chklen != 0) {
hexley	0:281d6ff68967	583	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
hexley	0:281d6ff68967	584	}
hexley	0:281d6ff68967	585	/* For UDP-Lite, checksum length of 0 means checksum
hexley	0:281d6ff68967	586	over the complete packet. (See RFC 3828 chap. 3.1)
hexley	0:281d6ff68967	587	At least the UDP-Lite header must be covered by the
hexley	0:281d6ff68967	588	checksum, therefore, if chksum_len has an illegal
hexley	0:281d6ff68967	589	value, we generate the checksum over the complete
hexley	0:281d6ff68967	590	packet to be safe. */
hexley	0:281d6ff68967	591	chklen_hdr = 0;
hexley	0:281d6ff68967	592	chklen = q->tot_len;
hexley	0:281d6ff68967	593	}
hexley	0:281d6ff68967	594	udphdr->len = htons(chklen_hdr);
hexley	0:281d6ff68967	595	/* calculate checksum */
hexley	0:281d6ff68967	596	#if CHECKSUM_GEN_UDP
hexley	0:281d6ff68967	597	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
hexley	0:281d6ff68967	598	IP_PROTO_UDPLITE, q->tot_len,
hexley	0:281d6ff68967	599	#if !LWIP_CHECKSUM_ON_COPY
hexley	0:281d6ff68967	600	chklen);
hexley	0:281d6ff68967	601	#else /* !LWIP_CHECKSUM_ON_COPY */
hexley	0:281d6ff68967	602	(have_chksum ? UDP_HLEN : chklen));
hexley	0:281d6ff68967	603	if (have_chksum) {
hexley	0:281d6ff68967	604	u32_t acc;
hexley	0:281d6ff68967	605	acc = udphdr->chksum + (u16_t)~(chksum);
hexley	0:281d6ff68967	606	udphdr->chksum = FOLD_U32T(acc);
hexley	0:281d6ff68967	607	}
hexley	0:281d6ff68967	608	#endif /* !LWIP_CHECKSUM_ON_COPY */
hexley	0:281d6ff68967	609
hexley	0:281d6ff68967	610	/* chksum zero must become 0xffff, as zero means 'no checksum' */
hexley	0:281d6ff68967	611	if (udphdr->chksum == 0x0000) {
hexley	0:281d6ff68967	612	udphdr->chksum = 0xffff;
hexley	0:281d6ff68967	613	}
hexley	0:281d6ff68967	614	#endif /* CHECKSUM_GEN_UDP */
hexley	0:281d6ff68967	615	/* output to IP */
hexley	0:281d6ff68967	616	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
hexley	0:281d6ff68967	617	#if LWIP_NETIF_HWADDRHINT
hexley	0:281d6ff68967	618	netif->addr_hint = &(pcb->addr_hint);
hexley	0:281d6ff68967	619	#endif /* LWIP_NETIF_HWADDRHINT*/
hexley	0:281d6ff68967	620	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
hexley	0:281d6ff68967	621	#if LWIP_NETIF_HWADDRHINT
hexley	0:281d6ff68967	622	netif->addr_hint = NULL;
hexley	0:281d6ff68967	623	#endif /* LWIP_NETIF_HWADDRHINT*/
hexley	0:281d6ff68967	624	} else
hexley	0:281d6ff68967	625	#endif /* LWIP_UDPLITE */
hexley	0:281d6ff68967	626	{ /* UDP */
hexley	0:281d6ff68967	627	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
hexley	0:281d6ff68967	628	udphdr->len = htons(q->tot_len);
hexley	0:281d6ff68967	629	/* calculate checksum */
hexley	0:281d6ff68967	630	#if CHECKSUM_GEN_UDP
hexley	0:281d6ff68967	631	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
hexley	0:281d6ff68967	632	u16_t udpchksum;
hexley	0:281d6ff68967	633	#if LWIP_CHECKSUM_ON_COPY
hexley	0:281d6ff68967	634	if (have_chksum) {
hexley	0:281d6ff68967	635	u32_t acc;
hexley	0:281d6ff68967	636	udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
hexley	0:281d6ff68967	637	q->tot_len, UDP_HLEN);
hexley	0:281d6ff68967	638	acc = udpchksum + (u16_t)~(chksum);
hexley	0:281d6ff68967	639	udpchksum = FOLD_U32T(acc);
hexley	0:281d6ff68967	640	} else
hexley	0:281d6ff68967	641	#endif /* LWIP_CHECKSUM_ON_COPY */
hexley	0:281d6ff68967	642	{
hexley	0:281d6ff68967	643	udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
hexley	0:281d6ff68967	644	}
hexley	0:281d6ff68967	645
hexley	0:281d6ff68967	646	/* chksum zero must become 0xffff, as zero means 'no checksum' */
hexley	0:281d6ff68967	647	if (udpchksum == 0x0000) {
hexley	0:281d6ff68967	648	udpchksum = 0xffff;
hexley	0:281d6ff68967	649	}
hexley	0:281d6ff68967	650	udphdr->chksum = udpchksum;
hexley	0:281d6ff68967	651	}
hexley	0:281d6ff68967	652	#endif /* CHECKSUM_GEN_UDP */
hexley	0:281d6ff68967	653	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
hexley	0:281d6ff68967	654	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
hexley	0:281d6ff68967	655	/* output to IP */
hexley	0:281d6ff68967	656	#if LWIP_NETIF_HWADDRHINT
hexley	0:281d6ff68967	657	netif->addr_hint = &(pcb->addr_hint);
hexley	0:281d6ff68967	658	#endif /* LWIP_NETIF_HWADDRHINT*/
hexley	0:281d6ff68967	659	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
hexley	0:281d6ff68967	660	#if LWIP_NETIF_HWADDRHINT
hexley	0:281d6ff68967	661	netif->addr_hint = NULL;
hexley	0:281d6ff68967	662	#endif /* LWIP_NETIF_HWADDRHINT*/
hexley	0:281d6ff68967	663	}
hexley	0:281d6ff68967	664	/* TODO: must this be increased even if error occured? */
hexley	0:281d6ff68967	665	snmp_inc_udpoutdatagrams();
hexley	0:281d6ff68967	666
hexley	0:281d6ff68967	667	/* did we chain a separate header pbuf earlier? */
hexley	0:281d6ff68967	668	if (q != p) {
hexley	0:281d6ff68967	669	/* free the header pbuf */
hexley	0:281d6ff68967	670	pbuf_free(q);
hexley	0:281d6ff68967	671	q = NULL;
hexley	0:281d6ff68967	672	/* p is still referenced by the caller, and will live on */
hexley	0:281d6ff68967	673	}
hexley	0:281d6ff68967	674
hexley	0:281d6ff68967	675	UDP_STATS_INC(udp.xmit);
hexley	0:281d6ff68967	676	return err;
hexley	0:281d6ff68967	677	}
hexley	0:281d6ff68967	678
hexley	0:281d6ff68967	679	/**
hexley	0:281d6ff68967	680	* Bind an UDP PCB.
hexley	0:281d6ff68967	681	*
hexley	0:281d6ff68967	682	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
hexley	0:281d6ff68967	683	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
hexley	0:281d6ff68967	684	* bind to all local interfaces.
hexley	0:281d6ff68967	685	* @param port local UDP port to bind with. Use 0 to automatically bind
hexley	0:281d6ff68967	686	* to a random port between UDP_LOCAL_PORT_RANGE_START and
hexley	0:281d6ff68967	687	* UDP_LOCAL_PORT_RANGE_END.
hexley	0:281d6ff68967	688	*
hexley	0:281d6ff68967	689	* ipaddr & port are expected to be in the same byte order as in the pcb.
hexley	0:281d6ff68967	690	*
hexley	0:281d6ff68967	691	* @return lwIP error code.
hexley	0:281d6ff68967	692	* - ERR_OK. Successful. No error occured.
hexley	0:281d6ff68967	693	* - ERR_USE. The specified ipaddr and port are already bound to by
hexley	0:281d6ff68967	694	* another UDP PCB.
hexley	0:281d6ff68967	695	*
hexley	0:281d6ff68967	696	* @see udp_disconnect()
hexley	0:281d6ff68967	697	*/
hexley	0:281d6ff68967	698	err_t
hexley	0:281d6ff68967	699	udp_bind(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
hexley	0:281d6ff68967	700	{
hexley	0:281d6ff68967	701	struct udp_pcb *ipcb;
hexley	0:281d6ff68967	702	u8_t rebind;
hexley	0:281d6ff68967	703
hexley	0:281d6ff68967	704	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
hexley	0:281d6ff68967	705	ip_addr_debug_print(UDP_DEBUG, ipaddr);
hexley	0:281d6ff68967	706	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
hexley	0:281d6ff68967	707
hexley	0:281d6ff68967	708	rebind = 0;
hexley	0:281d6ff68967	709	/* Check for double bind and rebind of the same pcb */
hexley	0:281d6ff68967	710	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
hexley	0:281d6ff68967	711	/* is this UDP PCB already on active list? */
hexley	0:281d6ff68967	712	if (pcb == ipcb) {
hexley	0:281d6ff68967	713	/* pcb may occur at most once in active list */
hexley	0:281d6ff68967	714	LWIP_ASSERT("rebind == 0", rebind == 0);
hexley	0:281d6ff68967	715	/* pcb already in list, just rebind */
hexley	0:281d6ff68967	716	rebind = 1;
hexley	0:281d6ff68967	717	}
hexley	0:281d6ff68967	718
hexley	0:281d6ff68967	719	/* By default, we don't allow to bind to a port that any other udp
hexley	0:281d6ff68967	720	PCB is alread bound to, unless all PCBs with that port have tha
hexley	0:281d6ff68967	721	REUSEADDR flag set. */
hexley	0:281d6ff68967	722	#if SO_REUSE
hexley	0:281d6ff68967	723	else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
hexley	0:281d6ff68967	724	((ipcb->so_options & SOF_REUSEADDR) == 0)) {
hexley	0:281d6ff68967	725	#else /* SO_REUSE */
hexley	0:281d6ff68967	726	/* port matches that of PCB in list and REUSEADDR not set -> reject */
hexley	0:281d6ff68967	727	else {
hexley	0:281d6ff68967	728	#endif /* SO_REUSE */
hexley	0:281d6ff68967	729	if ((ipcb->local_port == port) &&
hexley	0:281d6ff68967	730	/* IP address matches, or one is IP_ADDR_ANY? */
hexley	0:281d6ff68967	731	(ip_addr_isany(&(ipcb->local_ip)) \|\|
hexley	0:281d6ff68967	732	ip_addr_isany(ipaddr) \|\|
hexley	0:281d6ff68967	733	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
hexley	0:281d6ff68967	734	/* other PCB already binds to this local IP and port */
hexley	0:281d6ff68967	735	LWIP_DEBUGF(UDP_DEBUG,
hexley	0:281d6ff68967	736	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
hexley	0:281d6ff68967	737	return ERR_USE;
hexley	0:281d6ff68967	738	}
hexley	0:281d6ff68967	739	}
hexley	0:281d6ff68967	740	}
hexley	0:281d6ff68967	741
hexley	0:281d6ff68967	742	ip_addr_set(&pcb->local_ip, ipaddr);
hexley	0:281d6ff68967	743
hexley	0:281d6ff68967	744	/* no port specified? */
hexley	0:281d6ff68967	745	if (port == 0) {
hexley	0:281d6ff68967	746	#ifndef UDP_LOCAL_PORT_RANGE_START
hexley	0:281d6ff68967	747	#define UDP_LOCAL_PORT_RANGE_START 4096
hexley	0:281d6ff68967	748	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
hexley	0:281d6ff68967	749	#endif
hexley	0:281d6ff68967	750	port = UDP_LOCAL_PORT_RANGE_START;
hexley	0:281d6ff68967	751	ipcb = udp_pcbs;
hexley	0:281d6ff68967	752	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
hexley	0:281d6ff68967	753	if (ipcb->local_port == port) {
hexley	0:281d6ff68967	754	/* port is already used by another udp_pcb */
hexley	0:281d6ff68967	755	port++;
hexley	0:281d6ff68967	756	/* restart scanning all udp pcbs */
hexley	0:281d6ff68967	757	ipcb = udp_pcbs;
hexley	0:281d6ff68967	758	} else {
hexley	0:281d6ff68967	759	/* go on with next udp pcb */
hexley	0:281d6ff68967	760	ipcb = ipcb->next;
hexley	0:281d6ff68967	761	}
hexley	0:281d6ff68967	762	}
hexley	0:281d6ff68967	763	if (ipcb != NULL) {
hexley	0:281d6ff68967	764	/* no more ports available in local range */
hexley	0:281d6ff68967	765	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
hexley	0:281d6ff68967	766	return ERR_USE;
hexley	0:281d6ff68967	767	}
hexley	0:281d6ff68967	768	}
hexley	0:281d6ff68967	769	pcb->local_port = port;
hexley	0:281d6ff68967	770	snmp_insert_udpidx_tree(pcb);
hexley	0:281d6ff68967	771	/* pcb not active yet? */
hexley	0:281d6ff68967	772	if (rebind == 0) {
hexley	0:281d6ff68967	773	/* place the PCB on the active list if not already there */
hexley	0:281d6ff68967	774	pcb->next = udp_pcbs;
hexley	0:281d6ff68967	775	udp_pcbs = pcb;
hexley	0:281d6ff68967	776	}
hexley	0:281d6ff68967	777	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
hexley	0:281d6ff68967	778	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
hexley	0:281d6ff68967	779	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
hexley	0:281d6ff68967	780	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
hexley	0:281d6ff68967	781	pcb->local_port));
hexley	0:281d6ff68967	782	return ERR_OK;
hexley	0:281d6ff68967	783	}
hexley	0:281d6ff68967	784	/**
hexley	0:281d6ff68967	785	* Connect an UDP PCB.
hexley	0:281d6ff68967	786	*
hexley	0:281d6ff68967	787	* This will associate the UDP PCB with the remote address.
hexley	0:281d6ff68967	788	*
hexley	0:281d6ff68967	789	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
hexley	0:281d6ff68967	790	* @param ipaddr remote IP address to connect with.
hexley	0:281d6ff68967	791	* @param port remote UDP port to connect with.
hexley	0:281d6ff68967	792	*
hexley	0:281d6ff68967	793	* @return lwIP error code
hexley	0:281d6ff68967	794	*
hexley	0:281d6ff68967	795	* ipaddr & port are expected to be in the same byte order as in the pcb.
hexley	0:281d6ff68967	796	*
hexley	0:281d6ff68967	797	* The udp pcb is bound to a random local port if not already bound.
hexley	0:281d6ff68967	798	*
hexley	0:281d6ff68967	799	* @see udp_disconnect()
hexley	0:281d6ff68967	800	*/
hexley	0:281d6ff68967	801	err_t
hexley	0:281d6ff68967	802	udp_connect(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
hexley	0:281d6ff68967	803	{
hexley	0:281d6ff68967	804	struct udp_pcb *ipcb;
hexley	0:281d6ff68967	805
hexley	0:281d6ff68967	806	if (pcb->local_port == 0) {
hexley	0:281d6ff68967	807	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
hexley	0:281d6ff68967	808	if (err != ERR_OK) {
hexley	0:281d6ff68967	809	return err;
hexley	0:281d6ff68967	810	}
hexley	0:281d6ff68967	811	}
hexley	0:281d6ff68967	812
hexley	0:281d6ff68967	813	ip_addr_set(&pcb->remote_ip, ipaddr);
hexley	0:281d6ff68967	814	pcb->remote_port = port;
hexley	0:281d6ff68967	815	pcb->flags \|= UDP_FLAGS_CONNECTED;
hexley	0:281d6ff68967	816	/** TODO: this functionality belongs in upper layers */
hexley	0:281d6ff68967	817	#ifdef LWIP_UDP_TODO
hexley	0:281d6ff68967	818	/* Nail down local IP for netconn_addr()/getsockname() */
hexley	0:281d6ff68967	819	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
hexley	0:281d6ff68967	820	struct netif *netif;
hexley	0:281d6ff68967	821
hexley	0:281d6ff68967	822	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
hexley	0:281d6ff68967	823	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
hexley	0:281d6ff68967	824	UDP_STATS_INC(udp.rterr);
hexley	0:281d6ff68967	825	return ERR_RTE;
hexley	0:281d6ff68967	826	}
hexley	0:281d6ff68967	827	/** TODO: this will bind the udp pcb locally, to the interface which
hexley	0:281d6ff68967	828	is used to route output packets to the remote address. However, we
hexley	0:281d6ff68967	829	might want to accept incoming packets on any interface! */
hexley	0:281d6ff68967	830	pcb->local_ip = netif->ip_addr;
hexley	0:281d6ff68967	831	} else if (ip_addr_isany(&pcb->remote_ip)) {
hexley	0:281d6ff68967	832	pcb->local_ip.addr = 0;
hexley	0:281d6ff68967	833	}
hexley	0:281d6ff68967	834	#endif
hexley	0:281d6ff68967	835	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
hexley	0:281d6ff68967	836	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
hexley	0:281d6ff68967	837	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
hexley	0:281d6ff68967	838	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
hexley	0:281d6ff68967	839	pcb->local_port));
hexley	0:281d6ff68967	840
hexley	0:281d6ff68967	841	/* Insert UDP PCB into the list of active UDP PCBs. */
hexley	0:281d6ff68967	842	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
hexley	0:281d6ff68967	843	if (pcb == ipcb) {
hexley	0:281d6ff68967	844	/* already on the list, just return */
hexley	0:281d6ff68967	845	return ERR_OK;
hexley	0:281d6ff68967	846	}
hexley	0:281d6ff68967	847	}
hexley	0:281d6ff68967	848	/* PCB not yet on the list, add PCB now */
hexley	0:281d6ff68967	849	pcb->next = udp_pcbs;
hexley	0:281d6ff68967	850	udp_pcbs = pcb;
hexley	0:281d6ff68967	851	return ERR_OK;
hexley	0:281d6ff68967	852	}
hexley	0:281d6ff68967	853
hexley	0:281d6ff68967	854	/**
hexley	0:281d6ff68967	855	* Disconnect a UDP PCB
hexley	0:281d6ff68967	856	*
hexley	0:281d6ff68967	857	* @param pcb the udp pcb to disconnect.
hexley	0:281d6ff68967	858	*/
hexley	0:281d6ff68967	859	void
hexley	0:281d6ff68967	860	udp_disconnect(struct udp_pcb *pcb)
hexley	0:281d6ff68967	861	{
hexley	0:281d6ff68967	862	/* reset remote address association */
hexley	0:281d6ff68967	863	ip_addr_set_any(&pcb->remote_ip);
hexley	0:281d6ff68967	864	pcb->remote_port = 0;
hexley	0:281d6ff68967	865	/* mark PCB as unconnected */
hexley	0:281d6ff68967	866	pcb->flags &= ~UDP_FLAGS_CONNECTED;
hexley	0:281d6ff68967	867	}
hexley	0:281d6ff68967	868
hexley	0:281d6ff68967	869	/**
hexley	0:281d6ff68967	870	* Set a receive callback for a UDP PCB
hexley	0:281d6ff68967	871	*
hexley	0:281d6ff68967	872	* This callback will be called when receiving a datagram for the pcb.
hexley	0:281d6ff68967	873	*
hexley	0:281d6ff68967	874	* @param pcb the pcb for wich to set the recv callback
hexley	0:281d6ff68967	875	* @param recv function pointer of the callback function
hexley	0:281d6ff68967	876	* @param recv_arg additional argument to pass to the callback function
hexley	0:281d6ff68967	877	*/
hexley	0:281d6ff68967	878	void
hexley	0:281d6ff68967	879	udp_recv(struct udp_pcb pcb, udp_recv_fn recv, void recv_arg)
hexley	0:281d6ff68967	880	{
hexley	0:281d6ff68967	881	/* remember recv() callback and user data */
hexley	0:281d6ff68967	882	pcb->recv = recv;
hexley	0:281d6ff68967	883	pcb->recv_arg = recv_arg;
hexley	0:281d6ff68967	884	}
hexley	0:281d6ff68967	885
hexley	0:281d6ff68967	886	/**
hexley	0:281d6ff68967	887	* Remove an UDP PCB.
hexley	0:281d6ff68967	888	*
hexley	0:281d6ff68967	889	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
hexley	0:281d6ff68967	890	* UDP PCB's and the data structure is freed from memory.
hexley	0:281d6ff68967	891	*
hexley	0:281d6ff68967	892	* @see udp_new()
hexley	0:281d6ff68967	893	*/
hexley	0:281d6ff68967	894	void
hexley	0:281d6ff68967	895	udp_remove(struct udp_pcb *pcb)
hexley	0:281d6ff68967	896	{
hexley	0:281d6ff68967	897	struct udp_pcb *pcb2;
hexley	0:281d6ff68967	898
hexley	0:281d6ff68967	899	snmp_delete_udpidx_tree(pcb);
hexley	0:281d6ff68967	900	/* pcb to be removed is first in list? */
hexley	0:281d6ff68967	901	if (udp_pcbs == pcb) {
hexley	0:281d6ff68967	902	/* make list start at 2nd pcb */
hexley	0:281d6ff68967	903	udp_pcbs = udp_pcbs->next;
hexley	0:281d6ff68967	904	/* pcb not 1st in list */
hexley	0:281d6ff68967	905	} else {
hexley	0:281d6ff68967	906	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
hexley	0:281d6ff68967	907	/* find pcb in udp_pcbs list */
hexley	0:281d6ff68967	908	if (pcb2->next != NULL && pcb2->next == pcb) {
hexley	0:281d6ff68967	909	/* remove pcb from list */
hexley	0:281d6ff68967	910	pcb2->next = pcb->next;
hexley	0:281d6ff68967	911	}
hexley	0:281d6ff68967	912	}
hexley	0:281d6ff68967	913	}
hexley	0:281d6ff68967	914	memp_free(MEMP_UDP_PCB, pcb);
hexley	0:281d6ff68967	915	}
hexley	0:281d6ff68967	916
hexley	0:281d6ff68967	917	/**
hexley	0:281d6ff68967	918	* Create a UDP PCB.
hexley	0:281d6ff68967	919	*
hexley	0:281d6ff68967	920	* @return The UDP PCB which was created. NULL if the PCB data structure
hexley	0:281d6ff68967	921	* could not be allocated.
hexley	0:281d6ff68967	922	*
hexley	0:281d6ff68967	923	* @see udp_remove()
hexley	0:281d6ff68967	924	*/
hexley	0:281d6ff68967	925	struct udp_pcb *
hexley	0:281d6ff68967	926	udp_new(void)
hexley	0:281d6ff68967	927	{
hexley	0:281d6ff68967	928	struct udp_pcb *pcb;
hexley	0:281d6ff68967	929	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
hexley	0:281d6ff68967	930	/* could allocate UDP PCB? */
hexley	0:281d6ff68967	931	if (pcb != NULL) {
hexley	0:281d6ff68967	932	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
hexley	0:281d6ff68967	933	* which means checksum is generated over the whole datagram per default
hexley	0:281d6ff68967	934	* (recommended as default by RFC 3828). */
hexley	0:281d6ff68967	935	/* initialize PCB to all zeroes */
hexley	0:281d6ff68967	936	memset(pcb, 0, sizeof(struct udp_pcb));
hexley	0:281d6ff68967	937	pcb->ttl = UDP_TTL;
hexley	0:281d6ff68967	938	}
hexley	0:281d6ff68967	939	return pcb;
hexley	0:281d6ff68967	940	}
hexley	0:281d6ff68967	941
hexley	0:281d6ff68967	942	#if UDP_DEBUG
hexley	0:281d6ff68967	943	/**
hexley	0:281d6ff68967	944	* Print UDP header information for debug purposes.
hexley	0:281d6ff68967	945	*
hexley	0:281d6ff68967	946	* @param udphdr pointer to the udp header in memory.
hexley	0:281d6ff68967	947	*/
hexley	0:281d6ff68967	948	void
hexley	0:281d6ff68967	949	udp_debug_print(struct udp_hdr *udphdr)
hexley	0:281d6ff68967	950	{
hexley	0:281d6ff68967	951	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
hexley	0:281d6ff68967	952	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	953	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
hexley	0:281d6ff68967	954	ntohs(udphdr->src), ntohs(udphdr->dest)));
hexley	0:281d6ff68967	955	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	956	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
hexley	0:281d6ff68967	957	ntohs(udphdr->len), ntohs(udphdr->chksum)));
hexley	0:281d6ff68967	958	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
hexley	0:281d6ff68967	959	}
hexley	0:281d6ff68967	960	#endif /* UDP_DEBUG */
hexley	0:281d6ff68967	961
hexley	0:281d6ff68967	962	#endif /* LWIP_UDP */

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Type:	Library
Created:	19 Nov 2010
Imports:	44
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

lwip/core/udp.c@0:281d6ff68967, 2010-11-19 (annotated)

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