lwIP 2.2.1 Lightweight IP stack

Functions
RAW
APIs » "raw" APIs

## Functions
err_t | raw_bind (struct raw_pcb *pcb, const ip_addr_t *ipaddr)
void | raw_bind_netif (struct raw_pcb *pcb, const struct netif *netif)
err_t | raw_connect (struct raw_pcb *pcb, const ip_addr_t *ipaddr)
void | raw_disconnect (struct raw_pcb *pcb)
void | raw_recv (struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg)
err_t | raw_sendto (struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *ipaddr)
err_t | raw_sendto_if_src (struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip, struct netif *netif, const ip_addr_t *src_ip)
err_t | raw_send (struct raw_pcb *pcb, struct pbuf *p)
void | raw_remove (struct raw_pcb *pcb)
struct raw_pcb * | raw_new (u8_t proto)
struct raw_pcb * | raw_new_ip_type (u8_t type, u8_t proto)

## Detailed Description

Implementation of raw protocol PCBs for low-level handling of different types of protocols besides (or overriding) those already available in lwIP.

See also
  APIs

## Function Documentation

## ◆ raw_bind()

err_t raw_bind | ( | struct raw_pcb * | pcb,
|  | const ip_addr_t * | ipaddr
| ) |  |

Bind a RAW PCB.

Parameters

  pcb | RAW PCB to be bound with a local address ipaddr.
  ipaddr | local IP address to bind with. Use IP4_ADDR_ANY to bind to all local interfaces.

Returns
  lwIP error code.
  - ERR_OK. Successful. No error occurred.
  - ERR_USE. The specified IP address is already bound to by another RAW PCB.

See also
  raw_disconnect()

## ◆ raw_bind_netif()

void raw_bind_netif | ( | struct raw_pcb * | pcb,
|  | const struct netif * | netif
| ) |  |

Bind an RAW PCB to a specific netif. After calling this function, all packets received via this PCB are guaranteed to have come in via the specified netif, and all outgoing packets will go out via the specified netif.

Parameters

  pcb | RAW PCB to be bound with netif.
  netif | netif to bind to. Can be NULL.

See also
  raw_disconnect()

## ◆ raw_connect()

err_t raw_connect | ( | struct raw_pcb * | pcb,
|  | const ip_addr_t * | ipaddr
| ) |  |

Connect an RAW PCB. This function is required by upper layers of lwip. Using the raw api you could use raw_sendto() instead

This will associate the RAW PCB with the remote address.

Parameters

  pcb | RAW PCB to be connected with remote address ipaddr and port.
  ipaddr | remote IP address to connect with.

Returns
  lwIP error code

See also
  raw_disconnect() and raw_sendto()

## ◆ raw_disconnect()

void raw_disconnect | ( | struct raw_pcb * | pcb | ) |

Disconnect a RAW PCB.

Parameters

  pcb | the raw pcb to disconnect.

## ◆ raw_new()

struct raw_pcb* raw_new | ( | u8_t | proto | ) |

Create a RAW PCB.

Returns
  The RAW PCB which was created. NULL if the PCB data structure could not be allocated.

Parameters

  proto | the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)

See also
  raw_remove()

## ◆ raw_new_ip_type()

struct raw_pcb* raw_new_ip_type | ( | u8_t | type,
|  | u8_t | proto
| ) |  |

Create a RAW PCB for specific IP type.

Returns
  The RAW PCB which was created. NULL if the PCB data structure could not be allocated.

Parameters

  type | IP address type, see lwip_ip_addr_type definitions. If you want to listen to IPv4 and IPv6 (dual-stack) packets, supply IPADDR_TYPE_ANY as argument and bind to IP_ANY_TYPE.
  proto | the protocol number (next header) of the IPv6 packet payload (e.g. IP6_NEXTH_ICMP6)

See also
  raw_remove()

## ◆ raw_recv()

void raw_recv | ( | struct raw_pcb * | pcb,
|  | raw_recv_fn | recv,
|  | void * | recv_arg
| ) |  |

Set the callback function for received packets that match the raw PCB's protocol and binding.

The callback function MUST either

- eat the packet by calling pbuf_free() and returning non-zero. The packet will not be passed to other raw PCBs or other protocol layers.
- not free the packet, and return zero. The packet will be matched against further PCBs and/or forwarded to another protocol layers.

## ◆ raw_remove()

void raw_remove | ( | struct raw_pcb * | pcb | ) |

Remove an RAW PCB.

Parameters

  pcb | RAW PCB to be removed. The PCB is removed from the list of RAW PCB's and the data structure is freed from memory.

See also
  raw_new()

## ◆ raw_send()

err_t raw_send | ( | struct raw_pcb * | pcb,
|  | struct pbuf * | p
| ) |  |

Send the raw IP packet to the address given by raw_connect()

Parameters

  pcb | the raw pcb which to send
  p | the IP payload to send

## ◆ raw_sendto()

err_t raw_sendto | ( | struct raw_pcb * | pcb,
|  | struct pbuf * | p,
|  | const ip_addr_t * | ipaddr
| ) |  |

Send the raw IP packet to the given address. An IP header will be prepended to the packet, unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that case, the packet must include an IP header, which will then be sent as is.

Parameters

  pcb | the raw pcb which to send
  p | the IP payload to send
  ipaddr | the destination address of the IP packet

## ◆ raw_sendto_if_src()

err_t raw_sendto_if_src | ( | struct raw_pcb * | pcb,
|  | struct pbuf * | p,
|  | const ip_addr_t * | dst_ip,
|  | struct netif * | netif,
|  | const ip_addr_t * | src_ip
| ) |  |

Send the raw IP packet to the given address, using a particular outgoing netif and source IP address. An IP header will be prepended to the packet, unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that case, the packet must include an IP header, which will then be sent as is.

Parameters

  pcb | RAW PCB used to send the data
  p | chain of pbufs to be sent
  dst_ip | destination IP address
  netif | the netif used for sending
  src_ip | source IP address