| /** |
| * @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 */ |
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