ZG2100NetIfSource - ZG2100 Network interface source

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ZG2100 Network interface source

lwip/core/udp.c@4:e00281c7453d, 2010-08-06 (annotated)

Committer:: donatien
Date:: Fri Aug 06 10:46:03 2010 +0000
Revision:: 4:e00281c7453d
Parent:: 1:3a7c15057192

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:b802fc31f1db	1	/**
donatien	0:b802fc31f1db	2	* @file
donatien	0:b802fc31f1db	3	* User Datagram Protocol module
donatien	0:b802fc31f1db	4	*
donatien	0:b802fc31f1db	5	*/
donatien	0:b802fc31f1db	6
donatien	0:b802fc31f1db	7	/*
donatien	0:b802fc31f1db	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
donatien	0:b802fc31f1db	9	* All rights reserved.
donatien	0:b802fc31f1db	10	*
donatien	0:b802fc31f1db	11	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:b802fc31f1db	12	* are permitted provided that the following conditions are met:
donatien	0:b802fc31f1db	13	*
donatien	0:b802fc31f1db	14	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:b802fc31f1db	15	* this list of conditions and the following disclaimer.
donatien	0:b802fc31f1db	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:b802fc31f1db	17	* this list of conditions and the following disclaimer in the documentation
donatien	0:b802fc31f1db	18	* and/or other materials provided with the distribution.
donatien	0:b802fc31f1db	19	* 3. The name of the author may not be used to endorse or promote products
donatien	0:b802fc31f1db	20	* derived from this software without specific prior written permission.
donatien	0:b802fc31f1db	21	*
donatien	0:b802fc31f1db	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:b802fc31f1db	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:b802fc31f1db	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:b802fc31f1db	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:b802fc31f1db	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:b802fc31f1db	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:b802fc31f1db	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:b802fc31f1db	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:b802fc31f1db	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:b802fc31f1db	31	* OF SUCH DAMAGE.
donatien	0:b802fc31f1db	32	*
donatien	0:b802fc31f1db	33	* This file is part of the lwIP TCP/IP stack.
donatien	0:b802fc31f1db	34	*
donatien	0:b802fc31f1db	35	* Author: Adam Dunkels <adam@sics.se>
donatien	0:b802fc31f1db	36	*
donatien	0:b802fc31f1db	37	*/
donatien	0:b802fc31f1db	38
donatien	0:b802fc31f1db	39
donatien	0:b802fc31f1db	40	/* udp.c
donatien	0:b802fc31f1db	41	*
donatien	0:b802fc31f1db	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
donatien	0:b802fc31f1db	43	*
donatien	0:b802fc31f1db	44	*/
donatien	0:b802fc31f1db	45
donatien	0:b802fc31f1db	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
donatien	0:b802fc31f1db	47	*/
donatien	0:b802fc31f1db	48
donatien	0:b802fc31f1db	49	#include "lwip/opt.h"
donatien	0:b802fc31f1db	50
donatien	0:b802fc31f1db	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
donatien	0:b802fc31f1db	52
donatien	0:b802fc31f1db	53	#include "lwip/udp.h"
donatien	0:b802fc31f1db	54	#include "lwip/def.h"
donatien	0:b802fc31f1db	55	#include "lwip/memp.h"
donatien	0:b802fc31f1db	56	#include "lwip/inet_chksum.h"
donatien	0:b802fc31f1db	57	#include "lwip/ip_addr.h"
donatien	0:b802fc31f1db	58	#include "lwip/netif.h"
donatien	0:b802fc31f1db	59	#include "lwip/icmp.h"
donatien	0:b802fc31f1db	60	#include "lwip/stats.h"
donatien	0:b802fc31f1db	61	#include "lwip/snmp.h"
donatien	0:b802fc31f1db	62	#include "arch/perf.h"
donatien	0:b802fc31f1db	63	#include "lwip/dhcp.h"
donatien	0:b802fc31f1db	64
donatien	0:b802fc31f1db	65	#include <string.h>
donatien	0:b802fc31f1db	66
donatien	0:b802fc31f1db	67	/* The list of UDP PCBs */
donatien	0:b802fc31f1db	68	/* exported in udp.h (was static) */
donatien	0:b802fc31f1db	69	struct udp_pcb *udp_pcbs;
donatien	0:b802fc31f1db	70
donatien	0:b802fc31f1db	71	/**
donatien	0:b802fc31f1db	72	* Process an incoming UDP datagram.
donatien	0:b802fc31f1db	73	*
donatien	0:b802fc31f1db	74	* Given an incoming UDP datagram (as a chain of pbufs) this function
donatien	0:b802fc31f1db	75	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
donatien	0:b802fc31f1db	76	* recv function. If no pcb is found or the datagram is incorrect, the
donatien	0:b802fc31f1db	77	* pbuf is freed.
donatien	0:b802fc31f1db	78	*
donatien	0:b802fc31f1db	79	* @param p pbuf to be demultiplexed to a UDP PCB.
donatien	0:b802fc31f1db	80	* @param inp network interface on which the datagram was received.
donatien	0:b802fc31f1db	81	*
donatien	0:b802fc31f1db	82	*/
donatien	0:b802fc31f1db	83	void
donatien	0:b802fc31f1db	84	udp_input(struct pbuf p, struct netif inp)
donatien	0:b802fc31f1db	85	{
donatien	0:b802fc31f1db	86	struct udp_hdr *udphdr;
donatien	0:b802fc31f1db	87	struct udp_pcb pcb, prev;
donatien	0:b802fc31f1db	88	struct udp_pcb *uncon_pcb;
donatien	0:b802fc31f1db	89	struct ip_hdr *iphdr;
donatien	0:b802fc31f1db	90	u16_t src, dest;
donatien	0:b802fc31f1db	91	u8_t local_match;
donatien	0:b802fc31f1db	92	u8_t broadcast;
donatien	0:b802fc31f1db	93
donatien	0:b802fc31f1db	94	PERF_START;
donatien	0:b802fc31f1db	95
donatien	0:b802fc31f1db	96	UDP_STATS_INC(udp.recv);
donatien	0:b802fc31f1db	97
donatien	0:b802fc31f1db	98	iphdr = (struct ip_hdr *)p->payload;
donatien	0:b802fc31f1db	99
donatien	0:b802fc31f1db	100	/* Check minimum length (IP header + UDP header)
donatien	0:b802fc31f1db	101	* and move payload pointer to UDP header */
donatien	0:b802fc31f1db	102	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
donatien	0:b802fc31f1db	103	/* drop short packets */
donatien	0:b802fc31f1db	104	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:b802fc31f1db	105	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
donatien	0:b802fc31f1db	106	UDP_STATS_INC(udp.lenerr);
donatien	0:b802fc31f1db	107	UDP_STATS_INC(udp.drop);
donatien	0:b802fc31f1db	108	snmp_inc_udpinerrors();
donatien	0:b802fc31f1db	109	pbuf_free(p);
donatien	0:b802fc31f1db	110	goto end;
donatien	0:b802fc31f1db	111	}
donatien	0:b802fc31f1db	112
donatien	0:b802fc31f1db	113	udphdr = (struct udp_hdr *)p->payload;
donatien	0:b802fc31f1db	114
donatien	0:b802fc31f1db	115	/* is broadcast packet ? */
donatien	1:3a7c15057192	116	broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
donatien	0:b802fc31f1db	117
donatien	0:b802fc31f1db	118	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
donatien	0:b802fc31f1db	119
donatien	0:b802fc31f1db	120	/* convert src and dest ports to host byte order */
donatien	0:b802fc31f1db	121	src = ntohs(udphdr->src);
donatien	0:b802fc31f1db	122	dest = ntohs(udphdr->dest);
donatien	0:b802fc31f1db	123
donatien	0:b802fc31f1db	124	udp_debug_print(udphdr);
donatien	0:b802fc31f1db	125
donatien	0:b802fc31f1db	126	/* print the UDP source and destination */
donatien	0:b802fc31f1db	127	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:b802fc31f1db	128	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
donatien	0:b802fc31f1db	129	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
donatien	0:b802fc31f1db	130	ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
donatien	0:b802fc31f1db	131	ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
donatien	0:b802fc31f1db	132	ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
donatien	0:b802fc31f1db	133	ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
donatien	0:b802fc31f1db	134
donatien	0:b802fc31f1db	135	#if LWIP_DHCP
donatien	0:b802fc31f1db	136	pcb = NULL;
donatien	0:b802fc31f1db	137	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
donatien	0:b802fc31f1db	138	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
donatien	0:b802fc31f1db	139	if (dest == DHCP_CLIENT_PORT) {
donatien	0:b802fc31f1db	140	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
donatien	0:b802fc31f1db	141	if (src == DHCP_SERVER_PORT) {
donatien	0:b802fc31f1db	142	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
donatien	0:b802fc31f1db	143	/* accept the packe if
donatien	0:b802fc31f1db	144	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
donatien	0:b802fc31f1db	145	- inp->dhcp->pcb->remote == ANY or iphdr->src */
donatien	0:b802fc31f1db	146	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
donatien	1:3a7c15057192	147	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
donatien	0:b802fc31f1db	148	pcb = inp->dhcp->pcb;
donatien	0:b802fc31f1db	149	}
donatien	0:b802fc31f1db	150	}
donatien	0:b802fc31f1db	151	}
donatien	0:b802fc31f1db	152	} else
donatien	0:b802fc31f1db	153	#endif /* LWIP_DHCP */
donatien	0:b802fc31f1db	154	{
donatien	0:b802fc31f1db	155	prev = NULL;
donatien	0:b802fc31f1db	156	local_match = 0;
donatien	0:b802fc31f1db	157	uncon_pcb = NULL;
donatien	0:b802fc31f1db	158	/* Iterate through the UDP pcb list for a matching pcb.
donatien	0:b802fc31f1db	159	* 'Perfect match' pcbs (connected to the remote port & ip address) are
donatien	0:b802fc31f1db	160	* preferred. If no perfect match is found, the first unconnected pcb that
donatien	0:b802fc31f1db	161	* matches the local port and ip address gets the datagram. */
donatien	0:b802fc31f1db	162	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:b802fc31f1db	163	local_match = 0;
donatien	0:b802fc31f1db	164	/* print the PCB local and remote address */
donatien	0:b802fc31f1db	165	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:b802fc31f1db	166	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
donatien	0:b802fc31f1db	167	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
donatien	0:b802fc31f1db	168	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien	0:b802fc31f1db	169	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
donatien	0:b802fc31f1db	170	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
donatien	0:b802fc31f1db	171	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
donatien	0:b802fc31f1db	172
donatien	0:b802fc31f1db	173	/* compare PCB local addr+port to UDP destination addr+port */
donatien	0:b802fc31f1db	174	if ((pcb->local_port == dest) &&
donatien	0:b802fc31f1db	175	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
donatien	1:3a7c15057192	176	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) \|\|
donatien	0:b802fc31f1db	177	#if LWIP_IGMP
donatien	1:3a7c15057192	178	ip_addr_ismulticast(&current_iphdr_dest) \|\|
donatien	0:b802fc31f1db	179	#endif /* LWIP_IGMP */
donatien	0:b802fc31f1db	180	#if IP_SOF_BROADCAST_RECV
donatien	0:b802fc31f1db	181	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
donatien	0:b802fc31f1db	182	#else /* IP_SOF_BROADCAST_RECV */
donatien	0:b802fc31f1db	183	(broadcast))) {
donatien	0:b802fc31f1db	184	#endif /* IP_SOF_BROADCAST_RECV */
donatien	0:b802fc31f1db	185	local_match = 1;
donatien	0:b802fc31f1db	186	if ((uncon_pcb == NULL) &&
donatien	0:b802fc31f1db	187	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
donatien	0:b802fc31f1db	188	/* the first unconnected matching PCB */
donatien	0:b802fc31f1db	189	uncon_pcb = pcb;
donatien	0:b802fc31f1db	190	}
donatien	0:b802fc31f1db	191	}
donatien	0:b802fc31f1db	192	/* compare PCB remote addr+port to UDP source addr+port */
donatien	0:b802fc31f1db	193	if ((local_match != 0) &&
donatien	0:b802fc31f1db	194	(pcb->remote_port == src) &&
donatien	0:b802fc31f1db	195	(ip_addr_isany(&pcb->remote_ip) \|\|
donatien	1:3a7c15057192	196	ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
donatien	0:b802fc31f1db	197	/* the first fully matching PCB */
donatien	0:b802fc31f1db	198	if (prev != NULL) {
donatien	0:b802fc31f1db	199	/* move the pcb to the front of udp_pcbs so that is
donatien	0:b802fc31f1db	200	found faster next time */
donatien	0:b802fc31f1db	201	prev->next = pcb->next;
donatien	0:b802fc31f1db	202	pcb->next = udp_pcbs;
donatien	0:b802fc31f1db	203	udp_pcbs = pcb;
donatien	0:b802fc31f1db	204	} else {
donatien	0:b802fc31f1db	205	UDP_STATS_INC(udp.cachehit);
donatien	0:b802fc31f1db	206	}
donatien	0:b802fc31f1db	207	break;
donatien	0:b802fc31f1db	208	}
donatien	0:b802fc31f1db	209	prev = pcb;
donatien	0:b802fc31f1db	210	}
donatien	0:b802fc31f1db	211	/* no fully matching pcb found? then look for an unconnected pcb */
donatien	0:b802fc31f1db	212	if (pcb == NULL) {
donatien	0:b802fc31f1db	213	pcb = uncon_pcb;
donatien	0:b802fc31f1db	214	}
donatien	0:b802fc31f1db	215	}
donatien	0:b802fc31f1db	216
donatien	0:b802fc31f1db	217	/* Check checksum if this is a match or if it was directed at us. */
donatien	1:3a7c15057192	218	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
donatien	0:b802fc31f1db	219	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
donatien	0:b802fc31f1db	220	#if LWIP_UDPLITE
donatien	0:b802fc31f1db	221	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
donatien	0:b802fc31f1db	222	/* Do the UDP Lite checksum */
donatien	0:b802fc31f1db	223	#if CHECKSUM_CHECK_UDP
donatien	0:b802fc31f1db	224	u16_t chklen = ntohs(udphdr->len);
donatien	0:b802fc31f1db	225	if (chklen < sizeof(struct udp_hdr)) {
donatien	0:b802fc31f1db	226	if (chklen == 0) {
donatien	0:b802fc31f1db	227	/* For UDP-Lite, checksum length of 0 means checksum
donatien	0:b802fc31f1db	228	over the complete packet (See RFC 3828 chap. 3.1) */
donatien	0:b802fc31f1db	229	chklen = p->tot_len;
donatien	0:b802fc31f1db	230	} else {
donatien	0:b802fc31f1db	231	/* At least the UDP-Lite header must be covered by the
donatien	0:b802fc31f1db	232	checksum! (Again, see RFC 3828 chap. 3.1) */
donatien	0:b802fc31f1db	233	UDP_STATS_INC(udp.chkerr);
donatien	0:b802fc31f1db	234	UDP_STATS_INC(udp.drop);
donatien	0:b802fc31f1db	235	snmp_inc_udpinerrors();
donatien	0:b802fc31f1db	236	pbuf_free(p);
donatien	0:b802fc31f1db	237	goto end;
donatien	0:b802fc31f1db	238	}
donatien	0:b802fc31f1db	239	}
donatien	1:3a7c15057192	240	if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
donatien	0:b802fc31f1db	241	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
donatien	0:b802fc31f1db	242	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	243	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
donatien	0:b802fc31f1db	244	UDP_STATS_INC(udp.chkerr);
donatien	0:b802fc31f1db	245	UDP_STATS_INC(udp.drop);
donatien	0:b802fc31f1db	246	snmp_inc_udpinerrors();
donatien	0:b802fc31f1db	247	pbuf_free(p);
donatien	0:b802fc31f1db	248	goto end;
donatien	0:b802fc31f1db	249	}
donatien	0:b802fc31f1db	250	#endif /* CHECKSUM_CHECK_UDP */
donatien	0:b802fc31f1db	251	} else
donatien	0:b802fc31f1db	252	#endif /* LWIP_UDPLITE */
donatien	0:b802fc31f1db	253	{
donatien	0:b802fc31f1db	254	#if CHECKSUM_CHECK_UDP
donatien	0:b802fc31f1db	255	if (udphdr->chksum != 0) {
donatien	1:3a7c15057192	256	if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
donatien	0:b802fc31f1db	257	IP_PROTO_UDP, p->tot_len) != 0) {
donatien	0:b802fc31f1db	258	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	259	("udp_input: UDP datagram discarded due to failing checksum\n"));
donatien	0:b802fc31f1db	260	UDP_STATS_INC(udp.chkerr);
donatien	0:b802fc31f1db	261	UDP_STATS_INC(udp.drop);
donatien	0:b802fc31f1db	262	snmp_inc_udpinerrors();
donatien	0:b802fc31f1db	263	pbuf_free(p);
donatien	0:b802fc31f1db	264	goto end;
donatien	0:b802fc31f1db	265	}
donatien	0:b802fc31f1db	266	}
donatien	0:b802fc31f1db	267	#endif /* CHECKSUM_CHECK_UDP */
donatien	0:b802fc31f1db	268	}
donatien	0:b802fc31f1db	269	if(pbuf_header(p, -UDP_HLEN)) {
donatien	0:b802fc31f1db	270	/* Can we cope with this failing? Just assert for now */
donatien	0:b802fc31f1db	271	LWIP_ASSERT("pbuf_header failed\n", 0);
donatien	0:b802fc31f1db	272	UDP_STATS_INC(udp.drop);
donatien	0:b802fc31f1db	273	snmp_inc_udpinerrors();
donatien	0:b802fc31f1db	274	pbuf_free(p);
donatien	0:b802fc31f1db	275	goto end;
donatien	0:b802fc31f1db	276	}
donatien	0:b802fc31f1db	277	if (pcb != NULL) {
donatien	0:b802fc31f1db	278	snmp_inc_udpindatagrams();
donatien	1:3a7c15057192	279	#if SO_REUSE && SO_REUSE_RXTOALL
donatien	1:3a7c15057192	280	if ((broadcast \|\| ip_addr_ismulticast(&current_iphdr_dest)) &&
donatien	1:3a7c15057192	281	((pcb->so_options & SOF_REUSEADDR) != 0)) {
donatien	1:3a7c15057192	282	/* pass broadcast- or multicast packets to all multicast pcbs
donatien	1:3a7c15057192	283	if SOF_REUSEADDR is set on the first match */
donatien	1:3a7c15057192	284	struct udp_pcb *mpcb;
donatien	1:3a7c15057192	285	u8_t p_header_changed = 0;
donatien	1:3a7c15057192	286	for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
donatien	1:3a7c15057192	287	if (mpcb != pcb) {
donatien	1:3a7c15057192	288	/* compare PCB local addr+port to UDP destination addr+port */
donatien	1:3a7c15057192	289	if ((mpcb->local_port == dest) &&
donatien	1:3a7c15057192	290	((!broadcast && ip_addr_isany(&mpcb->local_ip)) \|\|
donatien	1:3a7c15057192	291	ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) \|\|
donatien	1:3a7c15057192	292	#if LWIP_IGMP
donatien	1:3a7c15057192	293	ip_addr_ismulticast(&current_iphdr_dest) \|\|
donatien	1:3a7c15057192	294	#endif /* LWIP_IGMP */
donatien	1:3a7c15057192	295	#if IP_SOF_BROADCAST_RECV
donatien	1:3a7c15057192	296	(broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
donatien	1:3a7c15057192	297	#else /* IP_SOF_BROADCAST_RECV */
donatien	1:3a7c15057192	298	(broadcast))) {
donatien	1:3a7c15057192	299	#endif /* IP_SOF_BROADCAST_RECV */
donatien	1:3a7c15057192	300	/* pass a copy of the packet to all local matches */
donatien	1:3a7c15057192	301	if (mpcb->recv != NULL) {
donatien	1:3a7c15057192	302	struct pbuf *q;
donatien	1:3a7c15057192	303	/* for that, move payload to IP header again */
donatien	1:3a7c15057192	304	if (p_header_changed == 0) {
donatien	1:3a7c15057192	305	pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
donatien	1:3a7c15057192	306	p_header_changed = 1;
donatien	1:3a7c15057192	307	}
donatien	1:3a7c15057192	308	q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
donatien	1:3a7c15057192	309	if (q != NULL) {
donatien	1:3a7c15057192	310	err_t err = pbuf_copy(q, p);
donatien	1:3a7c15057192	311	if (err == ERR_OK) {
donatien	1:3a7c15057192	312	/* move payload to UDP data */
donatien	1:3a7c15057192	313	pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
donatien	1:3a7c15057192	314	mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
donatien	1:3a7c15057192	315	}
donatien	1:3a7c15057192	316	}
donatien	1:3a7c15057192	317	}
donatien	1:3a7c15057192	318	}
donatien	1:3a7c15057192	319	}
donatien	1:3a7c15057192	320	}
donatien	1:3a7c15057192	321	if (p_header_changed) {
donatien	1:3a7c15057192	322	/* and move payload to UDP data again */
donatien	1:3a7c15057192	323	pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
donatien	1:3a7c15057192	324	}
donatien	1:3a7c15057192	325	}
donatien	1:3a7c15057192	326	#endif /* SO_REUSE && SO_REUSE_RXTOALL */
donatien	0:b802fc31f1db	327	/* callback */
donatien	0:b802fc31f1db	328	if (pcb->recv != NULL) {
donatien	0:b802fc31f1db	329	/* now the recv function is responsible for freeing p */
donatien	1:3a7c15057192	330	pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
donatien	0:b802fc31f1db	331	} else {
donatien	0:b802fc31f1db	332	/* no recv function registered? then we have to free the pbuf! */
donatien	0:b802fc31f1db	333	pbuf_free(p);
donatien	0:b802fc31f1db	334	goto end;
donatien	0:b802fc31f1db	335	}
donatien	0:b802fc31f1db	336	} else {
donatien	0:b802fc31f1db	337	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
donatien	0:b802fc31f1db	338
donatien	0:b802fc31f1db	339	#if LWIP_ICMP
donatien	0:b802fc31f1db	340	/* No match was found, send ICMP destination port unreachable unless
donatien	0:b802fc31f1db	341	destination address was broadcast/multicast. */
donatien	0:b802fc31f1db	342	if (!broadcast &&
donatien	1:3a7c15057192	343	!ip_addr_ismulticast(&current_iphdr_dest)) {
donatien	0:b802fc31f1db	344	/* move payload pointer back to ip header */
donatien	0:b802fc31f1db	345	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
donatien	0:b802fc31f1db	346	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
donatien	0:b802fc31f1db	347	icmp_dest_unreach(p, ICMP_DUR_PORT);
donatien	0:b802fc31f1db	348	}
donatien	0:b802fc31f1db	349	#endif /* LWIP_ICMP */
donatien	0:b802fc31f1db	350	UDP_STATS_INC(udp.proterr);
donatien	0:b802fc31f1db	351	UDP_STATS_INC(udp.drop);
donatien	0:b802fc31f1db	352	snmp_inc_udpnoports();
donatien	0:b802fc31f1db	353	pbuf_free(p);
donatien	0:b802fc31f1db	354	}
donatien	0:b802fc31f1db	355	} else {
donatien	0:b802fc31f1db	356	pbuf_free(p);
donatien	0:b802fc31f1db	357	}
donatien	0:b802fc31f1db	358	end:
donatien	0:b802fc31f1db	359	PERF_STOP("udp_input");
donatien	0:b802fc31f1db	360	}
donatien	0:b802fc31f1db	361
donatien	0:b802fc31f1db	362	/**
donatien	0:b802fc31f1db	363	* Send data using UDP.
donatien	0:b802fc31f1db	364	*
donatien	0:b802fc31f1db	365	* @param pcb UDP PCB used to send the data.
donatien	0:b802fc31f1db	366	* @param p chain of pbuf's to be sent.
donatien	0:b802fc31f1db	367	*
donatien	0:b802fc31f1db	368	* The datagram will be sent to the current remote_ip & remote_port
donatien	0:b802fc31f1db	369	* stored in pcb. If the pcb is not bound to a port, it will
donatien	0:b802fc31f1db	370	* automatically be bound to a random port.
donatien	0:b802fc31f1db	371	*
donatien	0:b802fc31f1db	372	* @return lwIP error code.
donatien	0:b802fc31f1db	373	* - ERR_OK. Successful. No error occured.
donatien	0:b802fc31f1db	374	* - ERR_MEM. Out of memory.
donatien	0:b802fc31f1db	375	* - ERR_RTE. Could not find route to destination address.
donatien	0:b802fc31f1db	376	* - More errors could be returned by lower protocol layers.
donatien	0:b802fc31f1db	377	*
donatien	0:b802fc31f1db	378	* @see udp_disconnect() udp_sendto()
donatien	0:b802fc31f1db	379	*/
donatien	0:b802fc31f1db	380	err_t
donatien	0:b802fc31f1db	381	udp_send(struct udp_pcb pcb, struct pbuf p)
donatien	0:b802fc31f1db	382	{
donatien	0:b802fc31f1db	383	/* send to the packet using remote ip and port stored in the pcb */
donatien	0:b802fc31f1db	384	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
donatien	0:b802fc31f1db	385	}
donatien	0:b802fc31f1db	386
donatien	1:3a7c15057192	387	#if LWIP_CHECKSUM_ON_COPY
donatien	1:3a7c15057192	388	/** Same as udp_send() but with checksum
donatien	1:3a7c15057192	389	*/
donatien	1:3a7c15057192	390	err_t
donatien	1:3a7c15057192	391	udp_send_chksum(struct udp_pcb pcb, struct pbuf p,
donatien	1:3a7c15057192	392	u8_t have_chksum, u16_t chksum)
donatien	1:3a7c15057192	393	{
donatien	1:3a7c15057192	394	/* send to the packet using remote ip and port stored in the pcb */
donatien	1:3a7c15057192	395	return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
donatien	1:3a7c15057192	396	have_chksum, chksum);
donatien	1:3a7c15057192	397	}
donatien	1:3a7c15057192	398	#endif /* LWIP_CHECKSUM_ON_COPY */
donatien	1:3a7c15057192	399
donatien	0:b802fc31f1db	400	/**
donatien	0:b802fc31f1db	401	* Send data to a specified address using UDP.
donatien	0:b802fc31f1db	402	*
donatien	0:b802fc31f1db	403	* @param pcb UDP PCB used to send the data.
donatien	0:b802fc31f1db	404	* @param p chain of pbuf's to be sent.
donatien	0:b802fc31f1db	405	* @param dst_ip Destination IP address.
donatien	0:b802fc31f1db	406	* @param dst_port Destination UDP port.
donatien	0:b802fc31f1db	407	*
donatien	0:b802fc31f1db	408	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
donatien	0:b802fc31f1db	409	*
donatien	0:b802fc31f1db	410	* If the PCB already has a remote address association, it will
donatien	0:b802fc31f1db	411	* be restored after the data is sent.
donatien	0:b802fc31f1db	412	*
donatien	0:b802fc31f1db	413	* @return lwIP error code (@see udp_send for possible error codes)
donatien	0:b802fc31f1db	414	*
donatien	0:b802fc31f1db	415	* @see udp_disconnect() udp_send()
donatien	0:b802fc31f1db	416	*/
donatien	0:b802fc31f1db	417	err_t
donatien	0:b802fc31f1db	418	udp_sendto(struct udp_pcb pcb, struct pbuf p,
donatien	0:b802fc31f1db	419	ip_addr_t *dst_ip, u16_t dst_port)
donatien	0:b802fc31f1db	420	{
donatien	1:3a7c15057192	421	#if LWIP_CHECKSUM_ON_COPY
donatien	1:3a7c15057192	422	return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
donatien	1:3a7c15057192	423	}
donatien	1:3a7c15057192	424
donatien	1:3a7c15057192	425	/** Same as udp_sendto(), but with checksum */
donatien	1:3a7c15057192	426	err_t
donatien	1:3a7c15057192	427	udp_sendto_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
donatien	1:3a7c15057192	428	u16_t dst_port, u8_t have_chksum, u16_t chksum)
donatien	1:3a7c15057192	429	{
donatien	1:3a7c15057192	430	#endif /* LWIP_CHECKSUM_ON_COPY */
donatien	0:b802fc31f1db	431	struct netif *netif;
donatien	0:b802fc31f1db	432
donatien	0:b802fc31f1db	433	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send\n"));
donatien	0:b802fc31f1db	434
donatien	0:b802fc31f1db	435	/* find the outgoing network interface for this packet */
donatien	0:b802fc31f1db	436	#if LWIP_IGMP
donatien	0:b802fc31f1db	437	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
donatien	0:b802fc31f1db	438	#else
donatien	0:b802fc31f1db	439	netif = ip_route(dst_ip);
donatien	0:b802fc31f1db	440	#endif /* LWIP_IGMP */
donatien	0:b802fc31f1db	441
donatien	0:b802fc31f1db	442	/* no outgoing network interface could be found? */
donatien	0:b802fc31f1db	443	if (netif == NULL) {
donatien	0:b802fc31f1db	444	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
donatien	0:b802fc31f1db	445	ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
donatien	0:b802fc31f1db	446	UDP_STATS_INC(udp.rterr);
donatien	0:b802fc31f1db	447	return ERR_RTE;
donatien	0:b802fc31f1db	448	}
donatien	1:3a7c15057192	449	#if LWIP_CHECKSUM_ON_COPY
donatien	1:3a7c15057192	450	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
donatien	1:3a7c15057192	451	#else /* LWIP_CHECKSUM_ON_COPY */
donatien	0:b802fc31f1db	452	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
donatien	1:3a7c15057192	453	#endif /* LWIP_CHECKSUM_ON_COPY */
donatien	0:b802fc31f1db	454	}
donatien	0:b802fc31f1db	455
donatien	0:b802fc31f1db	456	/**
donatien	0:b802fc31f1db	457	* Send data to a specified address using UDP.
donatien	0:b802fc31f1db	458	* The netif used for sending can be specified.
donatien	0:b802fc31f1db	459	*
donatien	0:b802fc31f1db	460	* This function exists mainly for DHCP, to be able to send UDP packets
donatien	0:b802fc31f1db	461	* on a netif that is still down.
donatien	0:b802fc31f1db	462	*
donatien	0:b802fc31f1db	463	* @param pcb UDP PCB used to send the data.
donatien	0:b802fc31f1db	464	* @param p chain of pbuf's to be sent.
donatien	0:b802fc31f1db	465	* @param dst_ip Destination IP address.
donatien	0:b802fc31f1db	466	* @param dst_port Destination UDP port.
donatien	0:b802fc31f1db	467	* @param netif the netif used for sending.
donatien	0:b802fc31f1db	468	*
donatien	0:b802fc31f1db	469	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
donatien	0:b802fc31f1db	470	*
donatien	0:b802fc31f1db	471	* @return lwIP error code (@see udp_send for possible error codes)
donatien	0:b802fc31f1db	472	*
donatien	0:b802fc31f1db	473	* @see udp_disconnect() udp_send()
donatien	0:b802fc31f1db	474	*/
donatien	0:b802fc31f1db	475	err_t
donatien	0:b802fc31f1db	476	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
donatien	0:b802fc31f1db	477	ip_addr_t dst_ip, u16_t dst_port, struct netif netif)
donatien	0:b802fc31f1db	478	{
donatien	1:3a7c15057192	479	#if LWIP_CHECKSUM_ON_COPY
donatien	1:3a7c15057192	480	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
donatien	1:3a7c15057192	481	}
donatien	1:3a7c15057192	482
donatien	1:3a7c15057192	483	/** Same as udp_sendto_if(), but with checksum */
donatien	1:3a7c15057192	484	err_t
donatien	1:3a7c15057192	485	udp_sendto_if_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
donatien	1:3a7c15057192	486	u16_t dst_port, struct netif *netif, u8_t have_chksum,
donatien	1:3a7c15057192	487	u16_t chksum)
donatien	1:3a7c15057192	488	{
donatien	1:3a7c15057192	489	#endif /* LWIP_CHECKSUM_ON_COPY */
donatien	0:b802fc31f1db	490	struct udp_hdr *udphdr;
donatien	0:b802fc31f1db	491	ip_addr_t *src_ip;
donatien	0:b802fc31f1db	492	err_t err;
donatien	0:b802fc31f1db	493	struct pbuf q; / q will be sent down the stack */
donatien	0:b802fc31f1db	494
donatien	0:b802fc31f1db	495	#if IP_SOF_BROADCAST
donatien	0:b802fc31f1db	496	/* broadcast filter? */
donatien	0:b802fc31f1db	497	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
donatien	0:b802fc31f1db	498	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	499	("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
donatien	0:b802fc31f1db	500	return ERR_VAL;
donatien	0:b802fc31f1db	501	}
donatien	0:b802fc31f1db	502	#endif /* IP_SOF_BROADCAST */
donatien	0:b802fc31f1db	503
donatien	0:b802fc31f1db	504	/* if the PCB is not yet bound to a port, bind it here */
donatien	0:b802fc31f1db	505	if (pcb->local_port == 0) {
donatien	0:b802fc31f1db	506	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
donatien	0:b802fc31f1db	507	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
donatien	0:b802fc31f1db	508	if (err != ERR_OK) {
donatien	0:b802fc31f1db	509	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
donatien	0:b802fc31f1db	510	return err;
donatien	0:b802fc31f1db	511	}
donatien	0:b802fc31f1db	512	}
donatien	0:b802fc31f1db	513
donatien	0:b802fc31f1db	514	/* not enough space to add an UDP header to first pbuf in given p chain? */
donatien	0:b802fc31f1db	515	if (pbuf_header(p, UDP_HLEN)) {
donatien	0:b802fc31f1db	516	/* allocate header in a separate new pbuf */
donatien	0:b802fc31f1db	517	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
donatien	0:b802fc31f1db	518	/* new header pbuf could not be allocated? */
donatien	0:b802fc31f1db	519	if (q == NULL) {
donatien	0:b802fc31f1db	520	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
donatien	0:b802fc31f1db	521	return ERR_MEM;
donatien	0:b802fc31f1db	522	}
donatien	0:b802fc31f1db	523	/* chain header q in front of given pbuf p */
donatien	0:b802fc31f1db	524	pbuf_chain(q, p);
donatien	0:b802fc31f1db	525	/* first pbuf q points to header pbuf */
donatien	0:b802fc31f1db	526	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:b802fc31f1db	527	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
donatien	0:b802fc31f1db	528	} else {
donatien	0:b802fc31f1db	529	/* adding space for header within p succeeded */
donatien	0:b802fc31f1db	530	/* first pbuf q equals given pbuf */
donatien	0:b802fc31f1db	531	q = p;
donatien	0:b802fc31f1db	532	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
donatien	0:b802fc31f1db	533	}
donatien	0:b802fc31f1db	534	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
donatien	0:b802fc31f1db	535	(q->len >= sizeof(struct udp_hdr)));
donatien	0:b802fc31f1db	536	/* q now represents the packet to be sent */
donatien	0:b802fc31f1db	537	udphdr = (struct udp_hdr *)q->payload;
donatien	0:b802fc31f1db	538	udphdr->src = htons(pcb->local_port);
donatien	0:b802fc31f1db	539	udphdr->dest = htons(dst_port);
donatien	0:b802fc31f1db	540	/* in UDP, 0 checksum means 'no checksum' */
donatien	0:b802fc31f1db	541	udphdr->chksum = 0x0000;
donatien	0:b802fc31f1db	542
donatien	1:3a7c15057192	543	/* Multicast Loop? */
donatien	1:3a7c15057192	544	#if LWIP_IGMP
donatien	1:3a7c15057192	545	if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
donatien	1:3a7c15057192	546	q->flags \|= PBUF_FLAG_MCASTLOOP;
donatien	1:3a7c15057192	547	}
donatien	1:3a7c15057192	548	#endif /* LWIP_IGMP */
donatien	1:3a7c15057192	549
donatien	1:3a7c15057192	550
donatien	0:b802fc31f1db	551	/* PCB local address is IP_ANY_ADDR? */
donatien	0:b802fc31f1db	552	if (ip_addr_isany(&pcb->local_ip)) {
donatien	0:b802fc31f1db	553	/* use outgoing network interface IP address as source address */
donatien	0:b802fc31f1db	554	src_ip = &(netif->ip_addr);
donatien	0:b802fc31f1db	555	} else {
donatien	0:b802fc31f1db	556	/* check if UDP PCB local IP address is correct
donatien	0:b802fc31f1db	557	* this could be an old address if netif->ip_addr has changed */
donatien	0:b802fc31f1db	558	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
donatien	0:b802fc31f1db	559	/* local_ip doesn't match, drop the packet */
donatien	0:b802fc31f1db	560	if (q != p) {
donatien	0:b802fc31f1db	561	/* free the header pbuf */
donatien	0:b802fc31f1db	562	pbuf_free(q);
donatien	0:b802fc31f1db	563	q = NULL;
donatien	0:b802fc31f1db	564	/* p is still referenced by the caller, and will live on */
donatien	0:b802fc31f1db	565	}
donatien	0:b802fc31f1db	566	return ERR_VAL;
donatien	0:b802fc31f1db	567	}
donatien	0:b802fc31f1db	568	/* use UDP PCB local IP address as source address */
donatien	0:b802fc31f1db	569	src_ip = &(pcb->local_ip);
donatien	0:b802fc31f1db	570	}
donatien	0:b802fc31f1db	571
donatien	0:b802fc31f1db	572	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
donatien	0:b802fc31f1db	573
donatien	0:b802fc31f1db	574	#if LWIP_UDPLITE
donatien	0:b802fc31f1db	575	/* UDP Lite protocol? */
donatien	0:b802fc31f1db	576	if (pcb->flags & UDP_FLAGS_UDPLITE) {
donatien	0:b802fc31f1db	577	u16_t chklen, chklen_hdr;
donatien	0:b802fc31f1db	578	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
donatien	0:b802fc31f1db	579	/* set UDP message length in UDP header */
donatien	0:b802fc31f1db	580	chklen_hdr = chklen = pcb->chksum_len_tx;
donatien	0:b802fc31f1db	581	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
donatien	0:b802fc31f1db	582	if (chklen != 0) {
donatien	0:b802fc31f1db	583	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
donatien	0:b802fc31f1db	584	}
donatien	0:b802fc31f1db	585	/* For UDP-Lite, checksum length of 0 means checksum
donatien	0:b802fc31f1db	586	over the complete packet. (See RFC 3828 chap. 3.1)
donatien	0:b802fc31f1db	587	At least the UDP-Lite header must be covered by the
donatien	0:b802fc31f1db	588	checksum, therefore, if chksum_len has an illegal
donatien	0:b802fc31f1db	589	value, we generate the checksum over the complete
donatien	0:b802fc31f1db	590	packet to be safe. */
donatien	0:b802fc31f1db	591	chklen_hdr = 0;
donatien	0:b802fc31f1db	592	chklen = q->tot_len;
donatien	0:b802fc31f1db	593	}
donatien	0:b802fc31f1db	594	udphdr->len = htons(chklen_hdr);
donatien	0:b802fc31f1db	595	/* calculate checksum */
donatien	0:b802fc31f1db	596	#if CHECKSUM_GEN_UDP
donatien	0:b802fc31f1db	597	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
donatien	1:3a7c15057192	598	IP_PROTO_UDPLITE, q->tot_len,
donatien	1:3a7c15057192	599	#if !LWIP_CHECKSUM_ON_COPY
donatien	1:3a7c15057192	600	chklen);
donatien	1:3a7c15057192	601	#else /* !LWIP_CHECKSUM_ON_COPY */
donatien	1:3a7c15057192	602	(have_chksum ? UDP_HLEN : chklen));
donatien	1:3a7c15057192	603	if (have_chksum) {
donatien	1:3a7c15057192	604	u32_t acc;
donatien	1:3a7c15057192	605	acc = udphdr->chksum + (u16_t)~(chksum);
donatien	1:3a7c15057192	606	udphdr->chksum = FOLD_U32T(acc);
donatien	1:3a7c15057192	607	}
donatien	1:3a7c15057192	608	#endif /* !LWIP_CHECKSUM_ON_COPY */
donatien	1:3a7c15057192	609
donatien	0:b802fc31f1db	610	/* chksum zero must become 0xffff, as zero means 'no checksum' */
donatien	0:b802fc31f1db	611	if (udphdr->chksum == 0x0000) {
donatien	0:b802fc31f1db	612	udphdr->chksum = 0xffff;
donatien	0:b802fc31f1db	613	}
donatien	0:b802fc31f1db	614	#endif /* CHECKSUM_GEN_UDP */
donatien	0:b802fc31f1db	615	/* output to IP */
donatien	0:b802fc31f1db	616	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
donatien	0:b802fc31f1db	617	#if LWIP_NETIF_HWADDRHINT
donatien	0:b802fc31f1db	618	netif->addr_hint = &(pcb->addr_hint);
donatien	0:b802fc31f1db	619	#endif /* LWIP_NETIF_HWADDRHINT*/
donatien	0:b802fc31f1db	620	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
donatien	0:b802fc31f1db	621	#if LWIP_NETIF_HWADDRHINT
donatien	0:b802fc31f1db	622	netif->addr_hint = NULL;
donatien	0:b802fc31f1db	623	#endif /* LWIP_NETIF_HWADDRHINT*/
donatien	0:b802fc31f1db	624	} else
donatien	0:b802fc31f1db	625	#endif /* LWIP_UDPLITE */
donatien	0:b802fc31f1db	626	{ /* UDP */
donatien	0:b802fc31f1db	627	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
donatien	0:b802fc31f1db	628	udphdr->len = htons(q->tot_len);
donatien	0:b802fc31f1db	629	/* calculate checksum */
donatien	0:b802fc31f1db	630	#if CHECKSUM_GEN_UDP
donatien	0:b802fc31f1db	631	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
donatien	1:3a7c15057192	632	u16_t udpchksum;
donatien	1:3a7c15057192	633	#if LWIP_CHECKSUM_ON_COPY
donatien	1:3a7c15057192	634	if (have_chksum) {
donatien	1:3a7c15057192	635	u32_t acc;
donatien	1:3a7c15057192	636	udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
donatien	1:3a7c15057192	637	q->tot_len, UDP_HLEN);
donatien	1:3a7c15057192	638	acc = udpchksum + (u16_t)~(chksum);
donatien	1:3a7c15057192	639	udpchksum = FOLD_U32T(acc);
donatien	1:3a7c15057192	640	} else
donatien	1:3a7c15057192	641	#endif /* LWIP_CHECKSUM_ON_COPY */
donatien	1:3a7c15057192	642	{
donatien	1:3a7c15057192	643	udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
donatien	1:3a7c15057192	644	}
donatien	1:3a7c15057192	645
donatien	0:b802fc31f1db	646	/* chksum zero must become 0xffff, as zero means 'no checksum' */
donatien	1:3a7c15057192	647	if (udpchksum == 0x0000) {
donatien	1:3a7c15057192	648	udpchksum = 0xffff;
donatien	0:b802fc31f1db	649	}
donatien	1:3a7c15057192	650	udphdr->chksum = udpchksum;
donatien	0:b802fc31f1db	651	}
donatien	0:b802fc31f1db	652	#endif /* CHECKSUM_GEN_UDP */
donatien	0:b802fc31f1db	653	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
donatien	0:b802fc31f1db	654	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
donatien	0:b802fc31f1db	655	/* output to IP */
donatien	0:b802fc31f1db	656	#if LWIP_NETIF_HWADDRHINT
donatien	0:b802fc31f1db	657	netif->addr_hint = &(pcb->addr_hint);
donatien	0:b802fc31f1db	658	#endif /* LWIP_NETIF_HWADDRHINT*/
donatien	0:b802fc31f1db	659	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
donatien	0:b802fc31f1db	660	#if LWIP_NETIF_HWADDRHINT
donatien	0:b802fc31f1db	661	netif->addr_hint = NULL;
donatien	0:b802fc31f1db	662	#endif /* LWIP_NETIF_HWADDRHINT*/
donatien	0:b802fc31f1db	663	}
donatien	0:b802fc31f1db	664	/* TODO: must this be increased even if error occured? */
donatien	0:b802fc31f1db	665	snmp_inc_udpoutdatagrams();
donatien	0:b802fc31f1db	666
donatien	0:b802fc31f1db	667	/* did we chain a separate header pbuf earlier? */
donatien	0:b802fc31f1db	668	if (q != p) {
donatien	0:b802fc31f1db	669	/* free the header pbuf */
donatien	0:b802fc31f1db	670	pbuf_free(q);
donatien	0:b802fc31f1db	671	q = NULL;
donatien	0:b802fc31f1db	672	/* p is still referenced by the caller, and will live on */
donatien	0:b802fc31f1db	673	}
donatien	0:b802fc31f1db	674
donatien	0:b802fc31f1db	675	UDP_STATS_INC(udp.xmit);
donatien	0:b802fc31f1db	676	return err;
donatien	0:b802fc31f1db	677	}
donatien	0:b802fc31f1db	678
donatien	0:b802fc31f1db	679	/**
donatien	0:b802fc31f1db	680	* Bind an UDP PCB.
donatien	0:b802fc31f1db	681	*
donatien	0:b802fc31f1db	682	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
donatien	0:b802fc31f1db	683	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
donatien	0:b802fc31f1db	684	* bind to all local interfaces.
donatien	0:b802fc31f1db	685	* @param port local UDP port to bind with. Use 0 to automatically bind
donatien	0:b802fc31f1db	686	* to a random port between UDP_LOCAL_PORT_RANGE_START and
donatien	0:b802fc31f1db	687	* UDP_LOCAL_PORT_RANGE_END.
donatien	0:b802fc31f1db	688	*
donatien	0:b802fc31f1db	689	* ipaddr & port are expected to be in the same byte order as in the pcb.
donatien	0:b802fc31f1db	690	*
donatien	0:b802fc31f1db	691	* @return lwIP error code.
donatien	0:b802fc31f1db	692	* - ERR_OK. Successful. No error occured.
donatien	0:b802fc31f1db	693	* - ERR_USE. The specified ipaddr and port are already bound to by
donatien	0:b802fc31f1db	694	* another UDP PCB.
donatien	0:b802fc31f1db	695	*
donatien	0:b802fc31f1db	696	* @see udp_disconnect()
donatien	0:b802fc31f1db	697	*/
donatien	0:b802fc31f1db	698	err_t
donatien	0:b802fc31f1db	699	udp_bind(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
donatien	0:b802fc31f1db	700	{
donatien	0:b802fc31f1db	701	struct udp_pcb *ipcb;
donatien	0:b802fc31f1db	702	u8_t rebind;
donatien	0:b802fc31f1db	703
donatien	0:b802fc31f1db	704	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
donatien	0:b802fc31f1db	705	ip_addr_debug_print(UDP_DEBUG, ipaddr);
donatien	0:b802fc31f1db	706	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
donatien	0:b802fc31f1db	707
donatien	0:b802fc31f1db	708	rebind = 0;
donatien	0:b802fc31f1db	709	/* Check for double bind and rebind of the same pcb */
donatien	0:b802fc31f1db	710	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
donatien	0:b802fc31f1db	711	/* is this UDP PCB already on active list? */
donatien	0:b802fc31f1db	712	if (pcb == ipcb) {
donatien	0:b802fc31f1db	713	/* pcb may occur at most once in active list */
donatien	0:b802fc31f1db	714	LWIP_ASSERT("rebind == 0", rebind == 0);
donatien	0:b802fc31f1db	715	/* pcb already in list, just rebind */
donatien	0:b802fc31f1db	716	rebind = 1;
donatien	0:b802fc31f1db	717	}
donatien	0:b802fc31f1db	718
donatien	1:3a7c15057192	719	/* By default, we don't allow to bind to a port that any other udp
donatien	1:3a7c15057192	720	PCB is alread bound to, unless all PCBs with that port have tha
donatien	1:3a7c15057192	721	REUSEADDR flag set. */
donatien	1:3a7c15057192	722	#if SO_REUSE
donatien	1:3a7c15057192	723	else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
donatien	1:3a7c15057192	724	((ipcb->so_options & SOF_REUSEADDR) == 0)) {
donatien	1:3a7c15057192	725	#else /* SO_REUSE */
donatien	1:3a7c15057192	726	/* port matches that of PCB in list and REUSEADDR not set -> reject */
donatien	0:b802fc31f1db	727	else {
donatien	1:3a7c15057192	728	#endif /* SO_REUSE */
donatien	0:b802fc31f1db	729	if ((ipcb->local_port == port) &&
donatien	0:b802fc31f1db	730	/* IP address matches, or one is IP_ADDR_ANY? */
donatien	0:b802fc31f1db	731	(ip_addr_isany(&(ipcb->local_ip)) \|\|
donatien	0:b802fc31f1db	732	ip_addr_isany(ipaddr) \|\|
donatien	0:b802fc31f1db	733	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
donatien	0:b802fc31f1db	734	/* other PCB already binds to this local IP and port */
donatien	0:b802fc31f1db	735	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:b802fc31f1db	736	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
donatien	0:b802fc31f1db	737	return ERR_USE;
donatien	0:b802fc31f1db	738	}
donatien	0:b802fc31f1db	739	}
donatien	0:b802fc31f1db	740	}
donatien	0:b802fc31f1db	741
donatien	0:b802fc31f1db	742	ip_addr_set(&pcb->local_ip, ipaddr);
donatien	0:b802fc31f1db	743
donatien	0:b802fc31f1db	744	/* no port specified? */
donatien	0:b802fc31f1db	745	if (port == 0) {
donatien	0:b802fc31f1db	746	#ifndef UDP_LOCAL_PORT_RANGE_START
donatien	0:b802fc31f1db	747	#define UDP_LOCAL_PORT_RANGE_START 4096
donatien	0:b802fc31f1db	748	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
donatien	0:b802fc31f1db	749	#endif
donatien	0:b802fc31f1db	750	port = UDP_LOCAL_PORT_RANGE_START;
donatien	0:b802fc31f1db	751	ipcb = udp_pcbs;
donatien	0:b802fc31f1db	752	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
donatien	0:b802fc31f1db	753	if (ipcb->local_port == port) {
donatien	0:b802fc31f1db	754	/* port is already used by another udp_pcb */
donatien	0:b802fc31f1db	755	port++;
donatien	0:b802fc31f1db	756	/* restart scanning all udp pcbs */
donatien	0:b802fc31f1db	757	ipcb = udp_pcbs;
donatien	0:b802fc31f1db	758	} else {
donatien	0:b802fc31f1db	759	/* go on with next udp pcb */
donatien	0:b802fc31f1db	760	ipcb = ipcb->next;
donatien	0:b802fc31f1db	761	}
donatien	0:b802fc31f1db	762	}
donatien	0:b802fc31f1db	763	if (ipcb != NULL) {
donatien	0:b802fc31f1db	764	/* no more ports available in local range */
donatien	0:b802fc31f1db	765	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
donatien	0:b802fc31f1db	766	return ERR_USE;
donatien	0:b802fc31f1db	767	}
donatien	0:b802fc31f1db	768	}
donatien	0:b802fc31f1db	769	pcb->local_port = port;
donatien	0:b802fc31f1db	770	snmp_insert_udpidx_tree(pcb);
donatien	0:b802fc31f1db	771	/* pcb not active yet? */
donatien	0:b802fc31f1db	772	if (rebind == 0) {
donatien	0:b802fc31f1db	773	/* place the PCB on the active list if not already there */
donatien	0:b802fc31f1db	774	pcb->next = udp_pcbs;
donatien	0:b802fc31f1db	775	udp_pcbs = pcb;
donatien	0:b802fc31f1db	776	}
donatien	0:b802fc31f1db	777	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
donatien	0:b802fc31f1db	778	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
donatien	0:b802fc31f1db	779	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien	0:b802fc31f1db	780	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
donatien	0:b802fc31f1db	781	pcb->local_port));
donatien	0:b802fc31f1db	782	return ERR_OK;
donatien	0:b802fc31f1db	783	}
donatien	0:b802fc31f1db	784	/**
donatien	0:b802fc31f1db	785	* Connect an UDP PCB.
donatien	0:b802fc31f1db	786	*
donatien	0:b802fc31f1db	787	* This will associate the UDP PCB with the remote address.
donatien	0:b802fc31f1db	788	*
donatien	0:b802fc31f1db	789	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
donatien	0:b802fc31f1db	790	* @param ipaddr remote IP address to connect with.
donatien	0:b802fc31f1db	791	* @param port remote UDP port to connect with.
donatien	0:b802fc31f1db	792	*
donatien	0:b802fc31f1db	793	* @return lwIP error code
donatien	0:b802fc31f1db	794	*
donatien	0:b802fc31f1db	795	* ipaddr & port are expected to be in the same byte order as in the pcb.
donatien	0:b802fc31f1db	796	*
donatien	0:b802fc31f1db	797	* The udp pcb is bound to a random local port if not already bound.
donatien	0:b802fc31f1db	798	*
donatien	0:b802fc31f1db	799	* @see udp_disconnect()
donatien	0:b802fc31f1db	800	*/
donatien	0:b802fc31f1db	801	err_t
donatien	0:b802fc31f1db	802	udp_connect(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
donatien	0:b802fc31f1db	803	{
donatien	0:b802fc31f1db	804	struct udp_pcb *ipcb;
donatien	0:b802fc31f1db	805
donatien	0:b802fc31f1db	806	if (pcb->local_port == 0) {
donatien	0:b802fc31f1db	807	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
donatien	0:b802fc31f1db	808	if (err != ERR_OK) {
donatien	0:b802fc31f1db	809	return err;
donatien	0:b802fc31f1db	810	}
donatien	0:b802fc31f1db	811	}
donatien	0:b802fc31f1db	812
donatien	0:b802fc31f1db	813	ip_addr_set(&pcb->remote_ip, ipaddr);
donatien	0:b802fc31f1db	814	pcb->remote_port = port;
donatien	0:b802fc31f1db	815	pcb->flags \|= UDP_FLAGS_CONNECTED;
donatien	0:b802fc31f1db	816	/** TODO: this functionality belongs in upper layers */
donatien	0:b802fc31f1db	817	#ifdef LWIP_UDP_TODO
donatien	0:b802fc31f1db	818	/* Nail down local IP for netconn_addr()/getsockname() */
donatien	0:b802fc31f1db	819	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
donatien	0:b802fc31f1db	820	struct netif *netif;
donatien	0:b802fc31f1db	821
donatien	0:b802fc31f1db	822	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
donatien	0:b802fc31f1db	823	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
donatien	0:b802fc31f1db	824	UDP_STATS_INC(udp.rterr);
donatien	0:b802fc31f1db	825	return ERR_RTE;
donatien	0:b802fc31f1db	826	}
donatien	0:b802fc31f1db	827	/** TODO: this will bind the udp pcb locally, to the interface which
donatien	0:b802fc31f1db	828	is used to route output packets to the remote address. However, we
donatien	0:b802fc31f1db	829	might want to accept incoming packets on any interface! */
donatien	0:b802fc31f1db	830	pcb->local_ip = netif->ip_addr;
donatien	0:b802fc31f1db	831	} else if (ip_addr_isany(&pcb->remote_ip)) {
donatien	0:b802fc31f1db	832	pcb->local_ip.addr = 0;
donatien	0:b802fc31f1db	833	}
donatien	0:b802fc31f1db	834	#endif
donatien	0:b802fc31f1db	835	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
donatien	0:b802fc31f1db	836	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
donatien	0:b802fc31f1db	837	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien	0:b802fc31f1db	838	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
donatien	0:b802fc31f1db	839	pcb->local_port));
donatien	0:b802fc31f1db	840
donatien	0:b802fc31f1db	841	/* Insert UDP PCB into the list of active UDP PCBs. */
donatien	0:b802fc31f1db	842	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
donatien	0:b802fc31f1db	843	if (pcb == ipcb) {
donatien	0:b802fc31f1db	844	/* already on the list, just return */
donatien	0:b802fc31f1db	845	return ERR_OK;
donatien	0:b802fc31f1db	846	}
donatien	0:b802fc31f1db	847	}
donatien	0:b802fc31f1db	848	/* PCB not yet on the list, add PCB now */
donatien	0:b802fc31f1db	849	pcb->next = udp_pcbs;
donatien	0:b802fc31f1db	850	udp_pcbs = pcb;
donatien	0:b802fc31f1db	851	return ERR_OK;
donatien	0:b802fc31f1db	852	}
donatien	0:b802fc31f1db	853
donatien	0:b802fc31f1db	854	/**
donatien	0:b802fc31f1db	855	* Disconnect a UDP PCB
donatien	0:b802fc31f1db	856	*
donatien	0:b802fc31f1db	857	* @param pcb the udp pcb to disconnect.
donatien	0:b802fc31f1db	858	*/
donatien	0:b802fc31f1db	859	void
donatien	0:b802fc31f1db	860	udp_disconnect(struct udp_pcb *pcb)
donatien	0:b802fc31f1db	861	{
donatien	0:b802fc31f1db	862	/* reset remote address association */
donatien	0:b802fc31f1db	863	ip_addr_set_any(&pcb->remote_ip);
donatien	0:b802fc31f1db	864	pcb->remote_port = 0;
donatien	0:b802fc31f1db	865	/* mark PCB as unconnected */
donatien	0:b802fc31f1db	866	pcb->flags &= ~UDP_FLAGS_CONNECTED;
donatien	0:b802fc31f1db	867	}
donatien	0:b802fc31f1db	868
donatien	0:b802fc31f1db	869	/**
donatien	0:b802fc31f1db	870	* Set a receive callback for a UDP PCB
donatien	0:b802fc31f1db	871	*
donatien	0:b802fc31f1db	872	* This callback will be called when receiving a datagram for the pcb.
donatien	0:b802fc31f1db	873	*
donatien	0:b802fc31f1db	874	* @param pcb the pcb for wich to set the recv callback
donatien	0:b802fc31f1db	875	* @param recv function pointer of the callback function
donatien	0:b802fc31f1db	876	* @param recv_arg additional argument to pass to the callback function
donatien	0:b802fc31f1db	877	*/
donatien	0:b802fc31f1db	878	void
donatien	0:b802fc31f1db	879	udp_recv(struct udp_pcb pcb, udp_recv_fn recv, void recv_arg)
donatien	0:b802fc31f1db	880	{
donatien	0:b802fc31f1db	881	/* remember recv() callback and user data */
donatien	0:b802fc31f1db	882	pcb->recv = recv;
donatien	0:b802fc31f1db	883	pcb->recv_arg = recv_arg;
donatien	0:b802fc31f1db	884	}
donatien	0:b802fc31f1db	885
donatien	0:b802fc31f1db	886	/**
donatien	0:b802fc31f1db	887	* Remove an UDP PCB.
donatien	0:b802fc31f1db	888	*
donatien	0:b802fc31f1db	889	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
donatien	0:b802fc31f1db	890	* UDP PCB's and the data structure is freed from memory.
donatien	0:b802fc31f1db	891	*
donatien	0:b802fc31f1db	892	* @see udp_new()
donatien	0:b802fc31f1db	893	*/
donatien	0:b802fc31f1db	894	void
donatien	0:b802fc31f1db	895	udp_remove(struct udp_pcb *pcb)
donatien	0:b802fc31f1db	896	{
donatien	0:b802fc31f1db	897	struct udp_pcb *pcb2;
donatien	0:b802fc31f1db	898
donatien	0:b802fc31f1db	899	snmp_delete_udpidx_tree(pcb);
donatien	0:b802fc31f1db	900	/* pcb to be removed is first in list? */
donatien	0:b802fc31f1db	901	if (udp_pcbs == pcb) {
donatien	0:b802fc31f1db	902	/* make list start at 2nd pcb */
donatien	0:b802fc31f1db	903	udp_pcbs = udp_pcbs->next;
donatien	0:b802fc31f1db	904	/* pcb not 1st in list */
donatien	0:b802fc31f1db	905	} else {
donatien	0:b802fc31f1db	906	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
donatien	0:b802fc31f1db	907	/* find pcb in udp_pcbs list */
donatien	0:b802fc31f1db	908	if (pcb2->next != NULL && pcb2->next == pcb) {
donatien	0:b802fc31f1db	909	/* remove pcb from list */
donatien	0:b802fc31f1db	910	pcb2->next = pcb->next;
donatien	0:b802fc31f1db	911	}
donatien	0:b802fc31f1db	912	}
donatien	0:b802fc31f1db	913	}
donatien	0:b802fc31f1db	914	memp_free(MEMP_UDP_PCB, pcb);
donatien	0:b802fc31f1db	915	}
donatien	0:b802fc31f1db	916
donatien	0:b802fc31f1db	917	/**
donatien	0:b802fc31f1db	918	* Create a UDP PCB.
donatien	0:b802fc31f1db	919	*
donatien	0:b802fc31f1db	920	* @return The UDP PCB which was created. NULL if the PCB data structure
donatien	0:b802fc31f1db	921	* could not be allocated.
donatien	0:b802fc31f1db	922	*
donatien	0:b802fc31f1db	923	* @see udp_remove()
donatien	0:b802fc31f1db	924	*/
donatien	0:b802fc31f1db	925	struct udp_pcb *
donatien	0:b802fc31f1db	926	udp_new(void)
donatien	0:b802fc31f1db	927	{
donatien	0:b802fc31f1db	928	struct udp_pcb *pcb;
donatien	0:b802fc31f1db	929	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
donatien	0:b802fc31f1db	930	/* could allocate UDP PCB? */
donatien	0:b802fc31f1db	931	if (pcb != NULL) {
donatien	0:b802fc31f1db	932	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
donatien	0:b802fc31f1db	933	* which means checksum is generated over the whole datagram per default
donatien	0:b802fc31f1db	934	* (recommended as default by RFC 3828). */
donatien	0:b802fc31f1db	935	/* initialize PCB to all zeroes */
donatien	0:b802fc31f1db	936	memset(pcb, 0, sizeof(struct udp_pcb));
donatien	0:b802fc31f1db	937	pcb->ttl = UDP_TTL;
donatien	0:b802fc31f1db	938	}
donatien	0:b802fc31f1db	939	return pcb;
donatien	0:b802fc31f1db	940	}
donatien	0:b802fc31f1db	941
donatien	0:b802fc31f1db	942	#if UDP_DEBUG
donatien	0:b802fc31f1db	943	/**
donatien	0:b802fc31f1db	944	* Print UDP header information for debug purposes.
donatien	0:b802fc31f1db	945	*
donatien	0:b802fc31f1db	946	* @param udphdr pointer to the udp header in memory.
donatien	0:b802fc31f1db	947	*/
donatien	0:b802fc31f1db	948	void
donatien	0:b802fc31f1db	949	udp_debug_print(struct udp_hdr *udphdr)
donatien	0:b802fc31f1db	950	{
donatien	0:b802fc31f1db	951	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
donatien	0:b802fc31f1db	952	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	953	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
donatien	0:b802fc31f1db	954	ntohs(udphdr->src), ntohs(udphdr->dest)));
donatien	0:b802fc31f1db	955	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	956	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
donatien	0:b802fc31f1db	957	ntohs(udphdr->len), ntohs(udphdr->chksum)));
donatien	0:b802fc31f1db	958	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien	0:b802fc31f1db	959	}
donatien	0:b802fc31f1db	960	#endif /* UDP_DEBUG */
donatien	0:b802fc31f1db	961
donatien	0:b802fc31f1db	962	#endif /* LWIP_UDP */

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Type:	Program
Created:	09 Jul 2010
Imports:	20
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	3

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lwip/core/udp.c@4:e00281c7453d, 2010-08-06 (annotated)

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