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udp.c File Reference
`#include "lwip/opt.h"`
`#include "lwip/udp.h"`
`#include "lwip/def.h"`
`#include "lwip/memp.h"`
`#include "lwip/inet_chksum.h"`
`#include "lwip/ip_addr.h"`
`#include "lwip/ip6.h"`
`#include "lwip/ip6_addr.h"`
`#include "lwip/netif.h"`
`#include "lwip/icmp.h"`
`#include "lwip/icmp6.h"`
`#include "lwip/stats.h"`
`#include "lwip/snmp.h"`
`#include "lwip/dhcp.h"`
`#include <string.h>`

## Functions

void | udp_init (void)
void | udp_input (struct pbuf *p, struct netif *inp)
err_t | udp_send (struct udp_pcb *pcb, struct pbuf *p)
err_t | udp_sendto (struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, u16_t dst_port)
err_t | udp_sendto_if (struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
err_t | udp_sendto_if_src (struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif, const ip_addr_t *src_ip)
err_t | udp_bind (struct udp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port)
void | udp_bind_netif (struct udp_pcb *pcb, const struct netif *netif)
err_t | udp_connect (struct udp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port)
void | udp_disconnect (struct udp_pcb *pcb)
void | udp_recv (struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
void | udp_remove (struct udp_pcb *pcb)
struct udp_pcb * | udp_new (void)
struct udp_pcb * | udp_new_ip_type (u8_t type)
void | udp_netif_ip_addr_changed (const ip_addr_t *old_addr, const ip_addr_t *new_addr)

## Detailed Description

User Datagram Protocol module
The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
See also UDP

## Function Documentation

## udp_init()

void udp_init | ( | void |  | ) |

Initialize this module.

## udp_input()

void udp_input | ( | struct pbuf * | p,
|  | struct netif * | inp )

Process an incoming UDP datagram.

Given an incoming UDP datagram (as a chain of pbufs) this function finds a corresponding UDP PCB and hands over the pbuf to the pcbs recv function. If no pcb is found or the datagram is incorrect, the pbuf is freed.

Parameters

  p | pbuf to be demultiplexed to a UDP PCB (p->payload pointing to the UDP header)
  inp | network interface on which the datagram was received.

## udp_netif_ip_addr_changed()

void udp_netif_ip_addr_changed | ( | const ip_addr_t * | old_addr,
|  | const ip_addr_t * | new_addr )

This function is called from netif.c when address is changed

Parameters

  old_addr | IP address of the netif before change
  new_addr | IP address of the netif after change