initial commit of lk (little kernel) project
diff --git a/lib/lwip/src/core/udp.c b/lib/lwip/src/core/udp.c
new file mode 100644
index 0000000..d1e0eac
--- /dev/null
+++ b/lib/lwip/src/core/udp.c
@@ -0,0 +1,655 @@
+/**
+ * @file
+ * User Datagram Protocol module
+ *
+ */
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+
+/* udp.c
+ *
+ * The code for the User Datagram Protocol UDP.
+ *
+ */
+
+#include <string.h>
+
+#include "lwip/opt.h"
+
+#include "lwip/def.h"
+#include "lwip/memp.h"
+#include "lwip/inet.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/udp.h"
+#include "lwip/icmp.h"
+
+#include "lwip/stats.h"
+
+#include "arch/perf.h"
+#include "lwip/snmp.h"
+
+/* The list of UDP PCBs */
+#if LWIP_UDP
+/* was static, but we may want to access this from a socket layer */
+struct udp_pcb *udp_pcbs = NULL;
+
+static struct udp_pcb *pcb_cache = NULL;
+
+void
+udp_init(void)
+{
+ udp_pcbs = pcb_cache = NULL;
+}
+
+/**
+ * Process an incoming UDP datagram.
+ *
+ * Given an incoming UDP datagram (as a chain of pbufs) this function
+ * finds a corresponding UDP PCB and
+ *
+ * @param pbuf pbuf to be demultiplexed to a UDP PCB.
+ * @param netif network interface on which the datagram was received.
+ *
+ */
+void
+udp_input(struct pbuf *p, struct netif *inp)
+{
+ struct udp_hdr *udphdr;
+ struct udp_pcb *pcb;
+ struct udp_pcb *uncon_pcb;
+ struct ip_hdr *iphdr;
+ u16_t src, dest;
+ u8_t local_match;
+
+ PERF_START;
+
+ UDP_STATS_INC(udp.recv);
+
+ iphdr = p->payload;
+
+ if (pbuf_header(p, -((s16_t)(UDP_HLEN + IPH_HL(iphdr) * 4)))) {
+ /* drop short packets */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
+ UDP_STATS_INC(udp.lenerr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpinerrors();
+ pbuf_free(p);
+ goto end;
+ }
+
+ udphdr = (struct udp_hdr *)((u8_t *)p->payload - UDP_HLEN);
+
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
+
+ src = ntohs(udphdr->src);
+ dest = ntohs(udphdr->dest);
+
+ udp_debug_print(udphdr);
+
+ /* print the UDP source and destination */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
+ ip4_addr1(&iphdr->dest), ip4_addr2(&iphdr->dest),
+ ip4_addr3(&iphdr->dest), ip4_addr4(&iphdr->dest), ntohs(udphdr->dest),
+ ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src),
+ ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src), ntohs(udphdr->src)));
+
+ local_match = 0;
+ uncon_pcb = NULL;
+ /* Iterate through the UDP pcb list for a matching pcb */
+ for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
+ /* print the PCB local and remote address */
+ LWIP_DEBUGF(UDP_DEBUG, ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
+ ip4_addr1(&pcb->local_ip), ip4_addr2(&pcb->local_ip),
+ ip4_addr3(&pcb->local_ip), ip4_addr4(&pcb->local_ip), pcb->local_port,
+ ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip),
+ ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip), pcb->remote_port));
+
+ /* compare PCB local addr+port to UDP destination addr+port */
+ if ((pcb->local_port == dest) &&
+ (ip_addr_isany(&pcb->local_ip) ||
+ ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
+ local_match = 1;
+ if ((uncon_pcb == NULL) &&
+ ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
+ /* the first unconnected matching PCB */
+ uncon_pcb = pcb;
+ }
+ }
+ /* compare PCB remote addr+port to UDP source addr+port */
+ if ((local_match != 0) &&
+ (pcb->remote_port == src) &&
+ (ip_addr_isany(&pcb->remote_ip) ||
+ ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) {
+ /* the first fully matching PCB */
+ break;
+ }
+ }
+ /* no fully matching pcb found? then look for an unconnected pcb */
+ if (pcb == NULL) {
+ pcb = uncon_pcb;
+ }
+
+ /* Check checksum if this is a match or if it was directed at us. */
+ if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &iphdr->dest))
+ {
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE, ("udp_input: calculating checksum\n"));
+ pbuf_header(p, UDP_HLEN);
+#ifdef IPv6
+ if (iphdr->nexthdr == IP_PROTO_UDPLITE) {
+#else
+ if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
+#endif /* IPv4 */
+ /* Do the UDP Lite checksum */
+#if CHECKSUM_CHECK_UDP
+ if (inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),
+ (struct ip_addr *)&(iphdr->dest),
+ IP_PROTO_UDPLITE, ntohs(udphdr->len)) != 0) {
+ LWIP_DEBUGF(UDP_DEBUG | 2, ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
+ UDP_STATS_INC(udp.chkerr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpinerrors();
+ pbuf_free(p);
+ goto end;
+ }
+#endif
+ } else {
+#if CHECKSUM_CHECK_UDP
+ if (udphdr->chksum != 0) {
+ if (inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),
+ (struct ip_addr *)&(iphdr->dest),
+ IP_PROTO_UDP, p->tot_len) != 0) {
+ LWIP_DEBUGF(UDP_DEBUG | 2, ("udp_input: UDP datagram discarded due to failing checksum\n"));
+
+ UDP_STATS_INC(udp.chkerr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpinerrors();
+ pbuf_free(p);
+ goto end;
+ }
+ }
+#endif
+ }
+ pbuf_header(p, -UDP_HLEN);
+ if (pcb != NULL) {
+ snmp_inc_udpindatagrams();
+ /* callback */
+ if (pcb->recv != NULL)
+ {
+ pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src), src);
+ }
+ } else {
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE, ("udp_input: not for us.\n"));
+
+ /* No match was found, send ICMP destination port unreachable unless
+ destination address was broadcast/multicast. */
+
+ if (!ip_addr_isbroadcast(&iphdr->dest, inp) &&
+ !ip_addr_ismulticast(&iphdr->dest)) {
+
+ /* adjust pbuf pointer */
+ p->payload = iphdr;
+ icmp_dest_unreach(p, ICMP_DUR_PORT);
+ }
+ UDP_STATS_INC(udp.proterr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpnoports();
+ pbuf_free(p);
+ }
+ } else {
+ pbuf_free(p);
+ }
+ end:
+
+ PERF_STOP("udp_input");
+}
+
+/**
+ * Send data to a specified address using UDP.
+ *
+ * @param pcb UDP PCB used to send the data.
+ * @param pbuf chain of pbuf's to be sent.
+ * @param dst_ip Destination IP address.
+ * @param dst_port Destination UDP port.
+ *
+ * If the PCB already has a remote address association, it will
+ * be restored after the data is sent.
+ *
+ * @return lwIP error code.
+ * - ERR_OK. Successful. No error occured.
+ * - ERR_MEM. Out of memory.
+ * - ERR_RTE. Could not find route to destination address.
+ *
+ * @see udp_disconnect() udp_send()
+ */
+err_t
+udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
+ struct ip_addr *dst_ip, u16_t dst_port)
+{
+ err_t err;
+ /* temporary space for current PCB remote address */
+ struct ip_addr pcb_remote_ip;
+ u16_t pcb_remote_port;
+ /* remember current remote peer address of PCB */
+ pcb_remote_ip.addr = pcb->remote_ip.addr;
+ pcb_remote_port = pcb->remote_port;
+ /* copy packet destination address to PCB remote peer address */
+ pcb->remote_ip.addr = dst_ip->addr;
+ pcb->remote_port = dst_port;
+ /* send to the packet destination address */
+ err = udp_send(pcb, p);
+ /* restore PCB remote peer address */
+ pcb->remote_ip.addr = pcb_remote_ip.addr;
+ pcb->remote_port = pcb_remote_port;
+ return err;
+}
+
+/**
+ * Send data using UDP.
+ *
+ * @param pcb UDP PCB used to send the data.
+ * @param pbuf chain of pbuf's to be sent.
+ *
+ * @return lwIP error code.
+ * - ERR_OK. Successful. No error occured.
+ * - ERR_MEM. Out of memory.
+ * - ERR_RTE. Could not find route to destination address.
+ *
+ * @see udp_disconnect() udp_sendto()
+ */
+err_t
+udp_send(struct udp_pcb *pcb, struct pbuf *p)
+{
+ struct udp_hdr *udphdr;
+ struct netif *netif;
+ struct ip_addr *src_ip;
+ err_t err;
+ struct pbuf *q; /* q will be sent down the stack */
+
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 3, ("udp_send\n"));
+
+ /* if the PCB is not yet bound to a port, bind it here */
+ if (pcb->local_port == 0) {
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 2, ("udp_send: not yet bound to a port, binding now\n"));
+ err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 2, ("udp_send: forced port bind failed\n"));
+ return err;
+ }
+ }
+ /* find the outgoing network interface for this packet */
+ netif = ip_route(&(pcb->remote_ip));
+ /* no outgoing network interface could be found? */
+ if (netif == NULL) {
+ LWIP_DEBUGF(UDP_DEBUG | 1, ("udp_send: No route to 0x%"X32_F"\n", pcb->remote_ip.addr));
+ UDP_STATS_INC(udp.rterr);
+ return ERR_RTE;
+ }
+
+ /* not enough space to add an UDP header to first pbuf in given p chain? */
+ if (pbuf_header(p, UDP_HLEN)) {
+ /* allocate header in a seperate new pbuf */
+ q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
+ /* new header pbuf could not be allocated? */
+ if (q == NULL) {
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 2, ("udp_send: could not allocate header\n"));
+ return ERR_MEM;
+ }
+ /* chain header q in front of given pbuf p */
+ pbuf_chain(q, p);
+ /* { first pbuf q points to header pbuf } */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
+ /* adding a header within p succeeded */
+ } else {
+ /* first pbuf q equals given pbuf */
+ q = p;
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
+ }
+ /* { q now represents the packet to be sent } */
+ udphdr = q->payload;
+ udphdr->src = htons(pcb->local_port);
+ udphdr->dest = htons(pcb->remote_port);
+ /* in UDP, 0 checksum means 'no checksum' */
+ udphdr->chksum = 0x0000;
+
+ /* PCB local address is IP_ANY_ADDR? */
+ if (ip_addr_isany(&pcb->local_ip)) {
+ /* use outgoing network interface IP address as source address */
+ src_ip = &(netif->ip_addr);
+ } else {
+ /* use UDP PCB local IP address as source address */
+ src_ip = &(pcb->local_ip);
+ }
+
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
+
+ /* UDP Lite protocol? */
+ if (pcb->flags & UDP_FLAGS_UDPLITE) {
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
+ /* set UDP message length in UDP header */
+ udphdr->len = htons(pcb->chksum_len);
+ /* calculate checksum */
+#if CHECKSUM_GEN_UDP
+ udphdr->chksum = inet_chksum_pseudo(q, src_ip, &(pcb->remote_ip),
+ IP_PROTO_UDP, pcb->chksum_len);
+ /* chksum zero must become 0xffff, as zero means 'no checksum' */
+ if (udphdr->chksum == 0x0000) udphdr->chksum = 0xffff;
+#else
+ udphdr->chksum = 0x0000;
+#endif
+ /* output to IP */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
+ err = ip_output_if (q, src_ip, &pcb->remote_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
+ /* UDP */
+ } else {
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
+ udphdr->len = htons(q->tot_len);
+ /* calculate checksum */
+#if CHECKSUM_GEN_UDP
+ if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
+ udphdr->chksum = inet_chksum_pseudo(q, src_ip, &pcb->remote_ip, IP_PROTO_UDP, q->tot_len);
+ /* chksum zero must become 0xffff, as zero means 'no checksum' */
+ if (udphdr->chksum == 0x0000) udphdr->chksum = 0xffff;
+ }
+#else
+ udphdr->chksum = 0x0000;
+#endif
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
+ /* output to IP */
+ err = ip_output_if(q, src_ip, &pcb->remote_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
+ }
+ /* TODO: must this be increased even if error occured? */
+ snmp_inc_udpoutdatagrams();
+
+ /* did we chain a seperate header pbuf earlier? */
+ if (q != p) {
+ /* free the header pbuf */
+ pbuf_free(q); q = NULL;
+ /* { p is still referenced by the caller, and will live on } */
+ }
+
+ UDP_STATS_INC(udp.xmit);
+ return err;
+}
+
+/**
+ * Bind an UDP PCB.
+ *
+ * @param pcb UDP PCB to be bound with a local address ipaddr and port.
+ * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
+ * bind to all local interfaces.
+ * @param port local UDP port to bind with.
+ *
+ * @return lwIP error code.
+ * - ERR_OK. Successful. No error occured.
+ * - ERR_USE. The specified ipaddr and port are already bound to by
+ * another UDP PCB.
+ *
+ * @see udp_disconnect()
+ */
+err_t
+udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port)
+{
+ struct udp_pcb *ipcb;
+ u8_t rebind;
+
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 3, ("udp_bind(ipaddr = "));
+ ip_addr_debug_print(UDP_DEBUG, ipaddr);
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | 3, (", port = %"U16_F")\n", port));
+
+ rebind = 0;
+ /* Check for double bind and rebind of the same pcb */
+ for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
+ /* is this UDP PCB already on active list? */
+ if (pcb == ipcb) {
+ /* pcb may occur at most once in active list */
+ LWIP_ASSERT("rebind == 0", rebind == 0);
+ /* pcb already in list, just rebind */
+ rebind = 1;
+ }
+
+/* this code does not allow upper layer to share a UDP port for
+ listening to broadcast or multicast traffic (See SO_REUSE_ADDR and
+ SO_REUSE_PORT under *BSD). TODO: See where it fits instead, OR
+ combine with implementation of UDP PCB flags. Leon Woestenberg. */
+#ifdef LWIP_UDP_TODO
+ /* port matches that of PCB in list? */
+ else if ((ipcb->local_port == port) &&
+ /* IP address matches, or one is IP_ADDR_ANY? */
+ (ip_addr_isany(&(ipcb->local_ip)) ||
+ ip_addr_isany(ipaddr) ||
+ ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
+ /* other PCB already binds to this local IP and port */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
+ return ERR_USE;
+ }
+#endif
+
+ }
+
+ ip_addr_set(&pcb->local_ip, ipaddr);
+ /* no port specified? */
+ if (port == 0) {
+#ifndef UDP_LOCAL_PORT_RANGE_START
+#define UDP_LOCAL_PORT_RANGE_START 4096
+#define UDP_LOCAL_PORT_RANGE_END 0x7fff
+#endif
+ port = UDP_LOCAL_PORT_RANGE_START;
+ ipcb = udp_pcbs;
+ while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
+ if (ipcb->local_port == port) {
+ port++;
+ ipcb = udp_pcbs;
+ } else
+ ipcb = ipcb->next;
+ }
+ if (ipcb != NULL) {
+ /* no more ports available in local range */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
+ return ERR_USE;
+ }
+ }
+ pcb->local_port = port;
+ /* pcb not active yet? */
+ if (rebind == 0) {
+ /* place the PCB on the active list if not already there */
+ pcb->next = udp_pcbs;
+ udp_pcbs = pcb;
+ }
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | DBG_STATE, ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
+ (u16_t)(ntohl(pcb->local_ip.addr) >> 24 & 0xff),
+ (u16_t)(ntohl(pcb->local_ip.addr) >> 16 & 0xff),
+ (u16_t)(ntohl(pcb->local_ip.addr) >> 8 & 0xff),
+ (u16_t)(ntohl(pcb->local_ip.addr) & 0xff), pcb->local_port));
+ return ERR_OK;
+}
+/**
+ * Connect an UDP PCB.
+ *
+ * This will associate the UDP PCB with the remote address.
+ *
+ * @param pcb UDP PCB to be connected with remote address ipaddr and port.
+ * @param ipaddr remote IP address to connect with.
+ * @param port remote UDP port to connect with.
+ *
+ * @return lwIP error code
+ *
+ * @see udp_disconnect()
+ */
+err_t
+udp_connect(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port)
+{
+ struct udp_pcb *ipcb;
+
+ if (pcb->local_port == 0) {
+ err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
+ if (err != ERR_OK)
+ return err;
+ }
+
+ ip_addr_set(&pcb->remote_ip, ipaddr);
+ pcb->remote_port = port;
+ pcb->flags |= UDP_FLAGS_CONNECTED;
+/** TODO: this functionality belongs in upper layers */
+#ifdef LWIP_UDP_TODO
+ /* Nail down local IP for netconn_addr()/getsockname() */
+ if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
+ struct netif *netif;
+
+ if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
+ UDP_STATS_INC(udp.rterr);
+ return ERR_RTE;
+ }
+ /** TODO: this will bind the udp pcb locally, to the interface which
+ is used to route output packets to the remote address. However, we
+ might want to accept incoming packets on any interface! */
+ pcb->local_ip = netif->ip_addr;
+ } else if (ip_addr_isany(&pcb->remote_ip)) {
+ pcb->local_ip.addr = 0;
+ }
+#endif
+ LWIP_DEBUGF(UDP_DEBUG | DBG_TRACE | DBG_STATE, ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
+ (u16_t)(ntohl(pcb->remote_ip.addr) >> 24 & 0xff),
+ (u16_t)(ntohl(pcb->remote_ip.addr) >> 16 & 0xff),
+ (u16_t)(ntohl(pcb->remote_ip.addr) >> 8 & 0xff),
+ (u16_t)(ntohl(pcb->remote_ip.addr) & 0xff), pcb->remote_port));
+
+ /* Insert UDP PCB into the list of active UDP PCBs. */
+ for(ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
+ if (pcb == ipcb) {
+ /* already on the list, just return */
+ return ERR_OK;
+ }
+ }
+ /* PCB not yet on the list, add PCB now */
+ pcb->next = udp_pcbs;
+ udp_pcbs = pcb;
+ return ERR_OK;
+}
+
+void
+udp_disconnect(struct udp_pcb *pcb)
+{
+ /* reset remote address association */
+ ip_addr_set(&pcb->remote_ip, IP_ADDR_ANY);
+ pcb->remote_port = 0;
+ /* mark PCB as unconnected */
+ pcb->flags &= ~UDP_FLAGS_CONNECTED;
+}
+
+void
+udp_recv(struct udp_pcb *pcb,
+ void (* recv)(void *arg, struct udp_pcb *upcb, struct pbuf *p,
+ struct ip_addr *addr, u16_t port),
+ void *recv_arg)
+{
+ /* remember recv() callback and user data */
+ pcb->recv = recv;
+ pcb->recv_arg = recv_arg;
+}
+/**
+ * Remove an UDP PCB.
+ *
+ * @param pcb UDP PCB to be removed. The PCB is removed from the list of
+ * UDP PCB's and the data structure is freed from memory.
+ *
+ * @see udp_new()
+ */
+void
+udp_remove(struct udp_pcb *pcb)
+{
+ struct udp_pcb *pcb2;
+ /* pcb to be removed is first in list? */
+ if (udp_pcbs == pcb) {
+ /* make list start at 2nd pcb */
+ udp_pcbs = udp_pcbs->next;
+ /* pcb not 1st in list */
+ } else for(pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
+ /* find pcb in udp_pcbs list */
+ if (pcb2->next != NULL && pcb2->next == pcb) {
+ /* remove pcb from list */
+ pcb2->next = pcb->next;
+ }
+ }
+ memp_free(MEMP_UDP_PCB, pcb);
+}
+/**
+ * Create a UDP PCB.
+ *
+ * @return The UDP PCB which was created. NULL if the PCB data structure
+ * could not be allocated.
+ *
+ * @see udp_remove()
+ */
+struct udp_pcb *
+udp_new(void) {
+ struct udp_pcb *pcb;
+ pcb = memp_malloc(MEMP_UDP_PCB);
+ /* could allocate UDP PCB? */
+ if (pcb != NULL) {
+ /* initialize PCB to all zeroes */
+ memset(pcb, 0, sizeof(struct udp_pcb));
+ pcb->ttl = UDP_TTL;
+ }
+
+
+ return pcb;
+}
+
+#if UDP_DEBUG
+void
+udp_debug_print(struct udp_hdr *udphdr)
+{
+ LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
+ LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
+ ntohs(udphdr->src), ntohs(udphdr->dest)));
+ LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
+ ntohs(udphdr->len), ntohs(udphdr->chksum)));
+ LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
+}
+#endif /* UDP_DEBUG */
+
+#endif /* LWIP_UDP */
+
+
+
+
+
+
+
+
+