pbuf.h

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/*
 * 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>
 *
 */
 
#ifndef LWIP_HDR_PBUF_H
#define LWIP_HDR_PBUF_H
 
#include "lwip/opt.h"
#include "lwip/err.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifndef LWIP_SUPPORT_CUSTOM_PBUF
#define LWIP_SUPPORT_CUSTOM_PBUF ((IP_FRAG && !LWIP_NETIF_TX_SINGLE_PBUF) || (LWIP_IPV6 && LWIP_IPV6_FRAG))
#endif
 
#ifndef PBUF_NEEDS_COPY
#define PBUF_NEEDS_COPY(p)  ((p)->type_internal & PBUF_TYPE_FLAG_DATA_VOLATILE)
#endif /* PBUF_NEEDS_COPY */
 
/* @todo: We need a mechanism to prevent wasting memory in every pbuf
   (TCP vs. UDP, IPv4 vs. IPv6: UDP/IPv4 packets may waste up to 28 bytes) */
 
#define PBUF_TRANSPORT_HLEN 20
#if LWIP_IPV6
#define PBUF_IP_HLEN        40
#else
#define PBUF_IP_HLEN        20
#endif
 
typedef enum {
  PBUF_TRANSPORT = PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN,
  PBUF_IP = PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN,
  PBUF_LINK = PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN,
  PBUF_RAW_TX = PBUF_LINK_ENCAPSULATION_HLEN,
  PBUF_RAW = 0
} pbuf_layer;
 
 
/* Base flags for pbuf_type definitions: */
 
#define PBUF_TYPE_FLAG_STRUCT_DATA_CONTIGUOUS       0x80
#define PBUF_TYPE_FLAG_DATA_VOLATILE                0x40
#define PBUF_TYPE_ALLOC_SRC_MASK                    0x0F
#define PBUF_ALLOC_FLAG_RX                          0x0100
#define PBUF_ALLOC_FLAG_DATA_CONTIGUOUS             0x0200
 
#define PBUF_TYPE_ALLOC_SRC_MASK_STD_HEAP           0x00
#define PBUF_TYPE_ALLOC_SRC_MASK_STD_MEMP_PBUF      0x01
#define PBUF_TYPE_ALLOC_SRC_MASK_STD_MEMP_PBUF_POOL 0x02
#define PBUF_TYPE_ALLOC_SRC_MASK_APP_MIN            0x03
#define PBUF_TYPE_ALLOC_SRC_MASK_APP_MAX            PBUF_TYPE_ALLOC_SRC_MASK
 
typedef enum {
  PBUF_RAM = (PBUF_ALLOC_FLAG_DATA_CONTIGUOUS | PBUF_TYPE_FLAG_STRUCT_DATA_CONTIGUOUS | PBUF_TYPE_ALLOC_SRC_MASK_STD_HEAP),
  PBUF_ROM = PBUF_TYPE_ALLOC_SRC_MASK_STD_MEMP_PBUF,
  PBUF_REF = (PBUF_TYPE_FLAG_DATA_VOLATILE | PBUF_TYPE_ALLOC_SRC_MASK_STD_MEMP_PBUF),
  PBUF_POOL = (PBUF_ALLOC_FLAG_RX | PBUF_TYPE_FLAG_STRUCT_DATA_CONTIGUOUS | PBUF_TYPE_ALLOC_SRC_MASK_STD_MEMP_PBUF_POOL)
} pbuf_type;
 
 
#define PBUF_FLAG_PUSH      0x01U
#define PBUF_FLAG_IS_CUSTOM 0x02U
#define PBUF_FLAG_MCASTLOOP 0x04U
#define PBUF_FLAG_LLBCAST   0x08U
#define PBUF_FLAG_LLMCAST   0x10U
#define PBUF_FLAG_TCP_FIN   0x20U
 
struct pbuf {
  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;
 
  LWIP_PBUF_CUSTOM_DATA
};
 
 
struct pbuf_rom {
  struct pbuf *next;
 
  const void *payload;
};
 
#if LWIP_SUPPORT_CUSTOM_PBUF
typedef void (*pbuf_free_custom_fn)(struct pbuf *p);
 
struct pbuf_custom {
  struct pbuf pbuf;
  pbuf_free_custom_fn custom_free_function;
};
#endif /* LWIP_SUPPORT_CUSTOM_PBUF */
 
#ifndef PBUF_POOL_FREE_OOSEQ
#define PBUF_POOL_FREE_OOSEQ 1
#endif /* PBUF_POOL_FREE_OOSEQ */
#if LWIP_TCP && TCP_QUEUE_OOSEQ && NO_SYS && PBUF_POOL_FREE_OOSEQ
extern volatile u8_t pbuf_free_ooseq_pending;
void pbuf_free_ooseq(void);
#define PBUF_CHECK_FREE_OOSEQ() do { if(pbuf_free_ooseq_pending) { \
  /* pbuf_alloc() reported PBUF_POOL to be empty -> try to free some \
     ooseq queued pbufs now */ \
  pbuf_free_ooseq(); }}while(0)
#else /* LWIP_TCP && TCP_QUEUE_OOSEQ && NO_SYS && PBUF_POOL_FREE_OOSEQ */
  /* Otherwise declare an empty PBUF_CHECK_FREE_OOSEQ */
  #define PBUF_CHECK_FREE_OOSEQ()
#endif /* LWIP_TCP && TCP_QUEUE_OOSEQ && NO_SYS && PBUF_POOL_FREE_OOSEQ*/
 
/* Initializes the pbuf module. This call is empty for now, but may not be in future. */
#define pbuf_init()
 
struct pbuf *pbuf_alloc(pbuf_layer l, u16_t length, pbuf_type type);
struct pbuf *pbuf_alloc_reference(void *payload, u16_t length, pbuf_type type);
#if LWIP_SUPPORT_CUSTOM_PBUF
struct pbuf *pbuf_alloced_custom(pbuf_layer l, u16_t length, pbuf_type type,
                                 struct pbuf_custom *p, void *payload_mem,
                                 u16_t payload_mem_len);
#endif /* LWIP_SUPPORT_CUSTOM_PBUF */
void pbuf_realloc(struct pbuf *p, u16_t size);
#define pbuf_get_allocsrc(p)          ((p)->type_internal & PBUF_TYPE_ALLOC_SRC_MASK)
#define pbuf_match_allocsrc(p, type)  (pbuf_get_allocsrc(p) == ((type) & PBUF_TYPE_ALLOC_SRC_MASK))
#define pbuf_match_type(p, type)      pbuf_match_allocsrc(p, type)
u8_t pbuf_header(struct pbuf *p, s16_t header_size);
u8_t pbuf_header_force(struct pbuf *p, s16_t header_size);
u8_t pbuf_add_header(struct pbuf *p, size_t header_size_increment);
u8_t pbuf_add_header_force(struct pbuf *p, size_t header_size_increment);
u8_t pbuf_remove_header(struct pbuf *p, size_t header_size);
struct pbuf *pbuf_free_header(struct pbuf *q, u16_t size);
void pbuf_ref(struct pbuf *p);
u8_t pbuf_free(struct pbuf *p);
u16_t pbuf_clen(const struct pbuf *p);
void pbuf_cat(struct pbuf *head, struct pbuf *tail);
void pbuf_chain(struct pbuf *head, struct pbuf *tail);
struct pbuf *pbuf_dechain(struct pbuf *p);
err_t pbuf_copy(struct pbuf *p_to, const struct pbuf *p_from);
err_t pbuf_copy_partial_pbuf(struct pbuf *p_to, const struct pbuf *p_from, u16_t copy_len, u16_t offset);
u16_t pbuf_copy_partial(const struct pbuf *p, void *dataptr, u16_t len, u16_t offset);
void *pbuf_get_contiguous(const struct pbuf *p, void *buffer, size_t bufsize, u16_t len, u16_t offset);
err_t pbuf_take(struct pbuf *buf, const void *dataptr, u16_t len);
err_t pbuf_take_at(struct pbuf *buf, const void *dataptr, u16_t len, u16_t offset);
struct pbuf *pbuf_skip(struct pbuf* in, u16_t in_offset, u16_t* out_offset);
struct pbuf *pbuf_coalesce(struct pbuf *p, pbuf_layer layer);
struct pbuf *pbuf_clone(pbuf_layer l, pbuf_type type, struct pbuf *p);
#if LWIP_CHECKSUM_ON_COPY
err_t pbuf_fill_chksum(struct pbuf *p, u16_t start_offset, const void *dataptr,
                       u16_t len, u16_t *chksum);
#endif /* LWIP_CHECKSUM_ON_COPY */
#if LWIP_TCP && TCP_QUEUE_OOSEQ && LWIP_WND_SCALE
void pbuf_split_64k(struct pbuf *p, struct pbuf **rest);
#endif /* LWIP_TCP && TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */
 
u8_t pbuf_get_at(const struct pbuf* p, u16_t offset);
int pbuf_try_get_at(const struct pbuf* p, u16_t offset);
void pbuf_put_at(struct pbuf* p, u16_t offset, u8_t data);
u16_t pbuf_memcmp(const struct pbuf* p, u16_t offset, const void* s2, u16_t n);
u16_t pbuf_memfind(const struct pbuf* p, const void* mem, u16_t mem_len, u16_t start_offset);
u16_t pbuf_strstr(const struct pbuf* p, const char* substr);
 
#ifdef __cplusplus
}
#endif
 
#endif /* LWIP_HDR_PBUF_H */