pbuf Struct Reference

#include <pbuf.h>

Data Fields
struct pbuf *	next
void *	payload
u16_t	tot_len
u16_t	len
u8_t	type_internal
u8_t	flags
LWIP_PBUF_REF_T	ref
u8_t	if_idx

Detailed Description

Main packet buffer struct

Field Documentation

struct pbuf* pbuf::next

next pbuf in singly linked pbuf chain

void* pbuf::payload

pointer to the actual data in the buffer

u16_t pbuf::tot_len

total length of this buffer and all next buffers in chain belonging to the same packet.

For non-queue packet chains this is the invariant: p->tot_len == p->len + (p->next? p->next->tot_len: 0)

u16_t pbuf::len

length of this buffer

u8_t pbuf::type_internal

a bit field indicating pbuf type and allocation sources (see PBUF_TYPE_FLAG_*, PBUF_ALLOC_FLAG_* and PBUF_TYPE_ALLOC_SRC_MASK)

u8_t pbuf::flags

misc flags

LWIP_PBUF_REF_T pbuf::ref

the reference count always equals the number of pointers that refer to this pbuf. This can be pointers from an application, the stack itself, or pbuf->next pointers from a chain.

u8_t pbuf::if_idx

For incoming packets, this contains the input netif's index