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lwip_udp.c File Reference
Functions

lwip_udp.c File Reference

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

Go to the source code of this file.

Functions

void udp_init (void)
 Initialize this module.
static u16_t udp_new_port (void)
 Allocate a new local UDP port.
static u8_t udp_input_local_match (struct udp_pcb *pcb, struct netif *inp, u8_t broadcast)
 Common code to see if the current input packet matches the pcb (current input packet is accessed via ip(4/6)_current_* macros)
void udp_input (struct pbuf *p, struct netif *inp)
 Process an incoming UDP datagram.
err_t udp_send (struct udp_pcb *pcb, struct pbuf *p)
 Send data using UDP.
err_t udp_send_chksum (struct udp_pcb *pcb, struct pbuf *p, u8_t have_chksum, u16_t chksum)
 Same as udp_send() but with checksum.
err_t udp_sendto (struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, u16_t dst_port)
 Send data to a specified address using UDP.
err_t udp_sendto_chksum (struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, u16_t dst_port, u8_t have_chksum, u16_t chksum)
 Same as udp_sendto(), but with checksum.
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)
 Send data to a specified address using UDP.
err_t udp_sendto_if_chksum (struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif, u8_t have_chksum, u16_t chksum)
 Same as udp_sendto_if(), but with checksum.
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)
 Same as udp_sendto_if, but with source address.
err_t udp_sendto_if_src_chksum (struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif, u8_t have_chksum, u16_t chksum, const ip_addr_t *src_ip)
 Same as udp_sendto_if_src(), but with checksum.
err_t udp_bind (struct udp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port)
 Bind an UDP PCB.
err_t udp_connect (struct udp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port)
 Connect an UDP PCB.
void udp_disconnect (struct udp_pcb *pcb)
 Disconnect a UDP PCB.
void udp_recv (struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
 Set a receive callback for a UDP PCB.
void udp_remove (struct udp_pcb *pcb)
 Remove an UDP PCB.
struct udp_pcb * udp_new (void)
 Create a UDP PCB.
struct udp_pcb * udp_new_ip_type (u8_t type)
 Create a UDP PCB for specific IP type.
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.
void udp_debug_print (struct udp_hdr *udphdr)
 Print UDP header information for debug purposes.

Detailed Description

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


See also UDP

Definition in file lwip_udp.c.

Function Documentation

void udp_debug_print ( struct udp_hdr *  udphdr )

Print UDP header information for debug purposes.

Parameters:
udphdrpointer to the udp header in memory.

Definition at line 1178 of file lwip_udp.c.

void udp_init ( void   )

Initialize this module.

Definition at line 87 of file lwip_udp.c.

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:
ppbuf to be demultiplexed to a UDP PCB (p->payload pointing to the UDP header)
inpnetwork interface on which the datagram was received.

Definition at line 185 of file lwip_udp.c.

static u8_t udp_input_local_match ( struct udp_pcb *  pcb,
struct netif *  inp,
u8_t  broadcast 
) [static]

Common code to see if the current input packet matches the pcb (current input packet is accessed via ip(4/6)_current_* macros)

Parameters:
pcbpcb to check
inpnetwork interface on which the datagram was received (only used for IPv4)
broadcast1 if his is an IPv4 broadcast (global or subnet-only), 0 otherwise (only used for IPv4)
Returns:
1 on match, 0 otherwise

Definition at line 130 of file lwip_udp.c.

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_addrIP address of the netif before change
new_addrIP address of the netif after change

Definition at line 1155 of file lwip_udp.c.

static u16_t udp_new_port ( void   ) [static]

Allocate a new local UDP port.

Returns:
a new (free) local UDP port number

Definition at line 100 of file lwip_udp.c.

err_t udp_sendto_if_chksum ( struct udp_pcb *  pcb,
struct pbuf *  p,
const ip_addr_t *  dst_ip,
u16_t  dst_port,
struct netif *  netif,
u8_t  have_chksum,
u16_t  chksum 
)

Same as udp_sendto_if(), but with checksum.

Definition at line 601 of file lwip_udp.c.

err_t udp_sendto_if_src_chksum ( struct udp_pcb *  pcb,
struct pbuf *  p,
const ip_addr_t *  dst_ip,
u16_t  dst_port,
struct netif *  netif,
u8_t  have_chksum,
u16_t  chksum,
const ip_addr_t *  src_ip 
)

Same as udp_sendto_if_src(), but with checksum.

Definition at line 670 of file lwip_udp.c.

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