blob: 8345649f96b50940c5a5b5d0ac9db226dce8883b [file] [log] [blame]
/** @file
@brief Network packet buffers for IP stack
Network data is passed between components using net_pkt.
*/
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <logging/log.h>
LOG_MODULE_REGISTER(net_pkt, CONFIG_NET_PKT_LOG_LEVEL);
/* This enables allocation debugging but does not print so much output
* as that can slow things down a lot.
*/
#undef NET_LOG_LEVEL
#if defined(CONFIG_NET_DEBUG_NET_PKT_ALLOC)
#define NET_LOG_LEVEL 5
#else
#define NET_LOG_LEVEL CONFIG_NET_PKT_LOG_LEVEL
#endif
#include <kernel.h>
#include <toolchain.h>
#include <string.h>
#include <zephyr/types.h>
#include <sys/types.h>
#include <sys/util.h>
#include <net/net_core.h>
#include <net/net_ip.h>
#include <net/buf.h>
#include <net/net_pkt.h>
#include <net/ethernet.h>
#include <net/udp.h>
#include "net_private.h"
#include "tcp_internal.h"
/* Find max header size of IP protocol (IPv4 or IPv6) */
#if defined(CONFIG_NET_IPV6) || defined(CONFIG_NET_RAW_MODE) || \
defined(CONFIG_NET_SOCKETS_PACKET) || defined(CONFIG_NET_SOCKETS_OFFLOAD)
#define MAX_IP_PROTO_LEN NET_IPV6H_LEN
#else
#if defined(CONFIG_NET_IPV4)
#define MAX_IP_PROTO_LEN NET_IPV4H_LEN
#else
#if defined(CONFIG_NET_SOCKETS_CAN)
/* TODO: Use CAN MTU here instead of hard coded value. There was
* weird circular dependency issue so this needs more TLC.
*/
#define MAX_IP_PROTO_LEN 8
#else
#error "Either IPv6 or IPv4 needs to be selected."
#endif /* SOCKETS_CAN */
#endif /* IPv4 */
#endif /* IPv6 */
/* Find max header size of "next" protocol (TCP, UDP or ICMP) */
#if defined(CONFIG_NET_TCP)
#define MAX_NEXT_PROTO_LEN NET_TCPH_LEN
#else
#if defined(CONFIG_NET_UDP)
#define MAX_NEXT_PROTO_LEN NET_UDPH_LEN
#else
#if defined(CONFIG_NET_SOCKETS_CAN)
#define MAX_NEXT_PROTO_LEN 0
#else
/* If no TCP and no UDP, apparently we still want pings to work. */
#define MAX_NEXT_PROTO_LEN NET_ICMPH_LEN
#endif /* SOCKETS_CAN */
#endif /* UDP */
#endif /* TCP */
/* Make sure that IP + TCP/UDP/ICMP headers fit into one fragment. This
* makes possible to cast a fragment pointer to protocol header struct.
*/
#if CONFIG_NET_BUF_DATA_SIZE < (MAX_IP_PROTO_LEN + MAX_NEXT_PROTO_LEN)
#if defined(STRING2)
#undef STRING2
#endif
#if defined(STRING)
#undef STRING
#endif
#define STRING2(x) #x
#define STRING(x) STRING2(x)
#pragma message "Data len " STRING(CONFIG_NET_BUF_DATA_SIZE)
#pragma message "Minimum len " STRING(MAX_IP_PROTO_LEN + MAX_NEXT_PROTO_LEN)
#error "Too small net_buf fragment size"
#endif
#if CONFIG_NET_PKT_RX_COUNT <= 0
#error "Minimum value for CONFIG_NET_PKT_RX_COUNT is 1"
#endif
#if CONFIG_NET_PKT_TX_COUNT <= 0
#error "Minimum value for CONFIG_NET_PKT_TX_COUNT is 1"
#endif
#if CONFIG_NET_BUF_RX_COUNT <= 0
#error "Minimum value for CONFIG_NET_BUF_RX_COUNT is 1"
#endif
#if CONFIG_NET_BUF_TX_COUNT <= 0
#error "Minimum value for CONFIG_NET_BUF_TX_COUNT is 1"
#endif
K_MEM_SLAB_DEFINE(rx_pkts, sizeof(struct net_pkt), CONFIG_NET_PKT_RX_COUNT, 4);
K_MEM_SLAB_DEFINE(tx_pkts, sizeof(struct net_pkt), CONFIG_NET_PKT_TX_COUNT, 4);
#if defined(CONFIG_NET_BUF_FIXED_DATA_SIZE)
NET_BUF_POOL_FIXED_DEFINE(rx_bufs, CONFIG_NET_BUF_RX_COUNT,
CONFIG_NET_BUF_DATA_SIZE, NULL);
NET_BUF_POOL_FIXED_DEFINE(tx_bufs, CONFIG_NET_BUF_TX_COUNT,
CONFIG_NET_BUF_DATA_SIZE, NULL);
#else /* !CONFIG_NET_BUF_FIXED_DATA_SIZE */
NET_BUF_POOL_VAR_DEFINE(rx_bufs, CONFIG_NET_BUF_RX_COUNT,
CONFIG_NET_BUF_DATA_POOL_SIZE, NULL);
NET_BUF_POOL_VAR_DEFINE(tx_bufs, CONFIG_NET_BUF_TX_COUNT,
CONFIG_NET_BUF_DATA_POOL_SIZE, NULL);
#endif /* CONFIG_NET_BUF_FIXED_DATA_SIZE */
/* Allocation tracking is only available if separately enabled */
#if defined(CONFIG_NET_DEBUG_NET_PKT_ALLOC)
struct net_pkt_alloc {
union {
struct net_pkt *pkt;
struct net_buf *buf;
void *alloc_data;
};
const char *func_alloc;
const char *func_free;
u16_t line_alloc;
u16_t line_free;
u8_t in_use;
bool is_pkt;
};
#define MAX_NET_PKT_ALLOCS (CONFIG_NET_PKT_RX_COUNT + \
CONFIG_NET_PKT_TX_COUNT + \
CONFIG_NET_BUF_RX_COUNT + \
CONFIG_NET_BUF_TX_COUNT + \
CONFIG_NET_DEBUG_NET_PKT_EXTERNALS)
static struct net_pkt_alloc net_pkt_allocs[MAX_NET_PKT_ALLOCS];
static void net_pkt_alloc_add(void *alloc_data, bool is_pkt,
const char *func, int line)
{
int i;
for (i = 0; i < MAX_NET_PKT_ALLOCS; i++) {
if (net_pkt_allocs[i].in_use) {
continue;
}
net_pkt_allocs[i].in_use = true;
net_pkt_allocs[i].is_pkt = is_pkt;
net_pkt_allocs[i].alloc_data = alloc_data;
net_pkt_allocs[i].func_alloc = func;
net_pkt_allocs[i].line_alloc = line;
return;
}
}
static void net_pkt_alloc_del(void *alloc_data, const char *func, int line)
{
int i;
for (i = 0; i < MAX_NET_PKT_ALLOCS; i++) {
if (net_pkt_allocs[i].in_use &&
net_pkt_allocs[i].alloc_data == alloc_data) {
net_pkt_allocs[i].func_free = func;
net_pkt_allocs[i].line_free = line;
net_pkt_allocs[i].in_use = false;
return;
}
}
}
static bool net_pkt_alloc_find(void *alloc_data,
const char **func_free,
int *line_free)
{
int i;
for (i = 0; i < MAX_NET_PKT_ALLOCS; i++) {
if (!net_pkt_allocs[i].in_use &&
net_pkt_allocs[i].alloc_data == alloc_data) {
*func_free = net_pkt_allocs[i].func_free;
*line_free = net_pkt_allocs[i].line_free;
return true;
}
}
return false;
}
void net_pkt_allocs_foreach(net_pkt_allocs_cb_t cb, void *user_data)
{
int i;
for (i = 0; i < MAX_NET_PKT_ALLOCS; i++) {
if (net_pkt_allocs[i].in_use) {
cb(net_pkt_allocs[i].is_pkt ?
net_pkt_allocs[i].pkt : NULL,
net_pkt_allocs[i].is_pkt ?
NULL : net_pkt_allocs[i].buf,
net_pkt_allocs[i].func_alloc,
net_pkt_allocs[i].line_alloc,
net_pkt_allocs[i].func_free,
net_pkt_allocs[i].line_free,
net_pkt_allocs[i].in_use,
user_data);
}
}
for (i = 0; i < MAX_NET_PKT_ALLOCS; i++) {
if (!net_pkt_allocs[i].in_use) {
cb(net_pkt_allocs[i].is_pkt ?
net_pkt_allocs[i].pkt : NULL,
net_pkt_allocs[i].is_pkt ?
NULL : net_pkt_allocs[i].buf,
net_pkt_allocs[i].func_alloc,
net_pkt_allocs[i].line_alloc,
net_pkt_allocs[i].func_free,
net_pkt_allocs[i].line_free,
net_pkt_allocs[i].in_use,
user_data);
}
}
}
#else
#define net_pkt_alloc_add(alloc_data, is_pkt, func, line)
#define net_pkt_alloc_del(alloc_data, func, line)
#define net_pkt_alloc_find(alloc_data, func_free, line_free) false
#endif /* CONFIG_NET_DEBUG_NET_PKT_ALLOC */
#if defined(CONFIG_NET_DEBUG_NET_PKT_ALLOC) || \
CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
#define NET_FRAG_CHECK_IF_NOT_IN_USE(frag, ref) \
do { \
if (!(ref)) { \
NET_ERR("**ERROR** frag %p not in use (%s:%s():%d)", \
frag, __FILE__, __func__, __LINE__); \
} \
} while (0)
const char *net_pkt_slab2str(struct k_mem_slab *slab)
{
if (slab == &rx_pkts) {
return "RX";
} else if (slab == &tx_pkts) {
return "TX";
}
return "EXT";
}
const char *net_pkt_pool2str(struct net_buf_pool *pool)
{
if (pool == &rx_bufs) {
return "RDATA";
} else if (pool == &tx_bufs) {
return "TDATA";
}
return "EDATA";
}
#endif
#if defined(CONFIG_NET_DEBUG_NET_PKT_ALLOC) || \
CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
static inline s16_t get_frees(struct net_buf_pool *pool)
{
#if defined(CONFIG_NET_BUF_POOL_USAGE)
return pool->avail_count;
#else
return 0;
#endif
}
#endif
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
static inline const char *get_name(struct net_buf_pool *pool)
{
#if defined(CONFIG_NET_BUF_POOL_USAGE)
return pool->name;
#else
return "?";
#endif
}
static inline s16_t get_size(struct net_buf_pool *pool)
{
#if defined(CONFIG_NET_BUF_POOL_USAGE)
return pool->pool_size;
#else
return 0;
#endif
}
static inline const char *slab2str(struct k_mem_slab *slab)
{
return net_pkt_slab2str(slab);
}
static inline const char *pool2str(struct net_buf_pool *pool)
{
return net_pkt_pool2str(pool);
}
void net_pkt_print_frags(struct net_pkt *pkt)
{
struct net_buf *frag;
size_t total = 0;
int count = 0, frag_size = 0;
if (!pkt) {
NET_INFO("pkt %p", pkt);
return;
}
NET_INFO("pkt %p frags %p", pkt, pkt->frags);
NET_ASSERT(pkt->frags);
frag = pkt->frags;
while (frag) {
total += frag->len;
frag_size = frag->size;
NET_INFO("[%d] frag %p len %d size %d pool %p",
count, frag, frag->len, frag_size,
net_buf_pool_get(frag->pool_id));
count++;
frag = frag->frags;
}
NET_INFO("Total data size %zu, occupied %d bytes, utilization %zu%%",
total, count * frag_size,
count ? (total * 100) / (count * frag_size) : 0);
}
#endif /* CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG */
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_buf *net_pkt_get_reserve_data_debug(struct net_buf_pool *pool,
s32_t timeout,
const char *caller,
int line)
#else /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
struct net_buf *net_pkt_get_reserve_data(struct net_buf_pool *pool,
s32_t timeout)
#endif /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
{
struct net_buf *frag;
/*
* The reserve_head variable in the function will tell
* the size of the link layer headers if there are any.
*/
if (k_is_in_isr()) {
frag = net_buf_alloc(pool, K_NO_WAIT);
} else {
frag = net_buf_alloc(pool, timeout);
}
if (!frag) {
return NULL;
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
NET_FRAG_CHECK_IF_NOT_IN_USE(frag, frag->ref + 1U);
#endif
net_pkt_alloc_add(frag, false, caller, line);
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("%s (%s) [%d] frag %p ref %d (%s():%d)",
pool2str(pool), get_name(pool), get_frees(pool),
frag, frag->ref, caller, line);
#endif
return frag;
}
/* Get a fragment, try to figure out the pool from where to get
* the data.
*/
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_buf *net_pkt_get_frag_debug(struct net_pkt *pkt,
s32_t timeout,
const char *caller, int line)
#else
struct net_buf *net_pkt_get_frag(struct net_pkt *pkt,
s32_t timeout)
#endif
{
#if defined(CONFIG_NET_CONTEXT_NET_PKT_POOL)
struct net_context *context;
context = net_pkt_context(pkt);
if (context && context->data_pool) {
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return net_pkt_get_reserve_data_debug(context->data_pool(),
timeout, caller, line);
#else
return net_pkt_get_reserve_data(context->data_pool(), timeout);
#endif /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
}
#endif /* CONFIG_NET_CONTEXT_NET_PKT_POOL */
if (pkt->slab == &rx_pkts) {
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return net_pkt_get_reserve_rx_data_debug(timeout,
caller, line);
#else
return net_pkt_get_reserve_rx_data(timeout);
#endif
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return net_pkt_get_reserve_tx_data_debug(timeout, caller, line);
#else
return net_pkt_get_reserve_tx_data(timeout);
#endif
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_buf *net_pkt_get_reserve_rx_data_debug(s32_t timeout,
const char *caller, int line)
{
return net_pkt_get_reserve_data_debug(&rx_bufs, timeout, caller, line);
}
struct net_buf *net_pkt_get_reserve_tx_data_debug(s32_t timeout,
const char *caller, int line)
{
return net_pkt_get_reserve_data_debug(&tx_bufs, timeout, caller, line);
}
#else /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
struct net_buf *net_pkt_get_reserve_rx_data(s32_t timeout)
{
return net_pkt_get_reserve_data(&rx_bufs, timeout);
}
struct net_buf *net_pkt_get_reserve_tx_data(s32_t timeout)
{
return net_pkt_get_reserve_data(&tx_bufs, timeout);
}
#endif /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
#if defined(CONFIG_NET_CONTEXT_NET_PKT_POOL)
static inline struct k_mem_slab *get_tx_slab(struct net_context *context)
{
if (context->tx_slab) {
return context->tx_slab();
}
return NULL;
}
static inline struct net_buf_pool *get_data_pool(struct net_context *context)
{
if (context->data_pool) {
return context->data_pool();
}
return NULL;
}
#else
#define get_tx_slab(...) NULL
#define get_data_pool(...) NULL
#endif /* CONFIG_NET_CONTEXT_NET_PKT_POOL */
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
void net_pkt_unref_debug(struct net_pkt *pkt, const char *caller, int line)
{
struct net_buf *frag;
#else
void net_pkt_unref(struct net_pkt *pkt)
{
#endif /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
atomic_val_t ref;
if (!pkt) {
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
NET_ERR("*** ERROR *** pkt %p (%s():%d)", pkt, caller, line);
#endif
return;
}
do {
ref = atomic_get(&pkt->atomic_ref);
if (!ref) {
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
const char *func_freed;
int line_freed;
if (net_pkt_alloc_find(pkt, &func_freed, &line_freed)) {
NET_ERR("*** ERROR *** pkt %p is freed already "
"by %s():%d (%s():%d)",
pkt, func_freed, line_freed, caller,
line);
} else {
NET_ERR("*** ERROR *** pkt %p is freed already "
"(%s():%d)", pkt, caller, line);
}
#endif
return;
}
} while (!atomic_cas(&pkt->atomic_ref, ref, ref - 1));
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("%s [%d] pkt %p ref %d frags %p (%s():%d)",
slab2str(pkt->slab), k_mem_slab_num_free_get(pkt->slab),
pkt, ref - 1, pkt->frags, caller, line);
#endif
if (ref > 1) {
goto done;
}
frag = pkt->frags;
while (frag) {
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("%s (%s) [%d] frag %p ref %d frags %p (%s():%d)",
pool2str(net_buf_pool_get(frag->pool_id)),
get_name(net_buf_pool_get(frag->pool_id)),
get_frees(net_buf_pool_get(frag->pool_id)), frag,
frag->ref - 1U, frag->frags, caller, line);
#endif
if (!frag->ref) {
const char *func_freed;
int line_freed;
if (net_pkt_alloc_find(frag,
&func_freed, &line_freed)) {
NET_ERR("*** ERROR *** frag %p is freed "
"already by %s():%d (%s():%d)",
frag, func_freed, line_freed,
caller, line);
} else {
NET_ERR("*** ERROR *** frag %p is freed "
"already (%s():%d)",
frag, caller, line);
}
}
net_pkt_alloc_del(frag, caller, line);
frag = frag->frags;
}
net_pkt_alloc_del(pkt, caller, line);
done:
#endif /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
if (ref > 1) {
return;
}
if (pkt->frags) {
net_pkt_frag_unref(pkt->frags);
}
if (IS_ENABLED(CONFIG_NET_DEBUG_NET_PKT_NON_FRAGILE_ACCESS)) {
pkt->buffer = NULL;
net_pkt_cursor_init(pkt);
}
k_mem_slab_free(pkt->slab, (void **)&pkt);
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_pkt *net_pkt_ref_debug(struct net_pkt *pkt, const char *caller,
int line)
#else
struct net_pkt *net_pkt_ref(struct net_pkt *pkt)
#endif /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
{
atomic_val_t ref;
do {
ref = pkt ? atomic_get(&pkt->atomic_ref) : 0;
if (!ref) {
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
NET_ERR("*** ERROR *** pkt %p (%s():%d)",
pkt, caller, line);
#endif
return NULL;
}
} while (!atomic_cas(&pkt->atomic_ref, ref, ref + 1));
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("%s [%d] pkt %p ref %d (%s():%d)",
slab2str(pkt->slab), k_mem_slab_num_free_get(pkt->slab),
pkt, ref + 1, caller, line);
#endif
return pkt;
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_buf *net_pkt_frag_ref_debug(struct net_buf *frag,
const char *caller, int line)
#else
struct net_buf *net_pkt_frag_ref(struct net_buf *frag)
#endif /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
{
if (!frag) {
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
NET_ERR("*** ERROR *** frag %p (%s():%d)", frag, caller, line);
#endif
return NULL;
}
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("%s (%s) [%d] frag %p ref %d (%s():%d)",
pool2str(net_buf_pool_get(frag->pool_id)),
get_name(net_buf_pool_get(frag->pool_id)),
get_frees(net_buf_pool_get(frag->pool_id)),
frag, frag->ref + 1U, caller, line);
#endif
return net_buf_ref(frag);
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
void net_pkt_frag_unref_debug(struct net_buf *frag,
const char *caller, int line)
#else
void net_pkt_frag_unref(struct net_buf *frag)
#endif /* NET_LOG_LEVEL >= LOG_LEVEL_DBG */
{
if (!frag) {
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
NET_ERR("*** ERROR *** frag %p (%s():%d)", frag, caller, line);
#endif
return;
}
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("%s (%s) [%d] frag %p ref %d (%s():%d)",
pool2str(net_buf_pool_get(frag->pool_id)),
get_name(net_buf_pool_get(frag->pool_id)),
get_frees(net_buf_pool_get(frag->pool_id)),
frag, frag->ref - 1U, caller, line);
#endif
if (frag->ref == 1U) {
net_pkt_alloc_del(frag, caller, line);
}
net_buf_unref(frag);
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_buf *net_pkt_frag_del_debug(struct net_pkt *pkt,
struct net_buf *parent,
struct net_buf *frag,
const char *caller, int line)
#else
struct net_buf *net_pkt_frag_del(struct net_pkt *pkt,
struct net_buf *parent,
struct net_buf *frag)
#endif
{
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("pkt %p parent %p frag %p ref %u (%s:%d)",
pkt, parent, frag, frag->ref, caller, line);
#endif
if (pkt->frags == frag && !parent) {
struct net_buf *tmp;
if (frag->ref == 1U) {
net_pkt_alloc_del(frag, caller, line);
}
tmp = net_buf_frag_del(NULL, frag);
pkt->frags = tmp;
return tmp;
}
if (frag->ref == 1U) {
net_pkt_alloc_del(frag, caller, line);
}
return net_buf_frag_del(parent, frag);
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
void net_pkt_frag_add_debug(struct net_pkt *pkt, struct net_buf *frag,
const char *caller, int line)
#else
void net_pkt_frag_add(struct net_pkt *pkt, struct net_buf *frag)
#endif
{
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("pkt %p frag %p (%s:%d)", pkt, frag, caller, line);
#endif
/* We do not use net_buf_frag_add() as this one will refcount
* the frag once more if !pkt->frags
*/
if (!pkt->frags) {
pkt->frags = frag;
return;
}
net_buf_frag_insert(net_buf_frag_last(pkt->frags), frag);
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
void net_pkt_frag_insert_debug(struct net_pkt *pkt, struct net_buf *frag,
const char *caller, int line)
#else
void net_pkt_frag_insert(struct net_pkt *pkt, struct net_buf *frag)
#endif
{
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("pkt %p frag %p (%s:%d)", pkt, frag, caller, line);
#endif
net_buf_frag_last(frag)->frags = pkt->frags;
pkt->frags = frag;
}
bool net_pkt_compact(struct net_pkt *pkt)
{
struct net_buf *frag, *prev;
NET_DBG("Compacting data in pkt %p", pkt);
frag = pkt->frags;
prev = NULL;
while (frag) {
if (frag->frags) {
/* Copy amount of data from next fragment to this
* fragment.
*/
size_t copy_len;
copy_len = frag->frags->len;
if (copy_len > net_buf_tailroom(frag)) {
copy_len = net_buf_tailroom(frag);
}
memcpy(net_buf_tail(frag), frag->frags->data, copy_len);
net_buf_add(frag, copy_len);
memmove(frag->frags->data,
frag->frags->data + copy_len,
frag->frags->len - copy_len);
frag->frags->len -= copy_len;
/* Is there any more space in this fragment */
if (net_buf_tailroom(frag)) {
/* There is. This also means that the next
* fragment is empty as otherwise we could
* not have copied all data. Remove next
* fragment as there is no data in it any more.
*/
net_pkt_frag_del(pkt, frag, frag->frags);
/* Then check next fragment */
continue;
}
} else {
if (!frag->len) {
/* Remove the last fragment because there is no
* data in it.
*/
net_pkt_frag_del(pkt, prev, frag);
break;
}
}
prev = frag;
frag = frag->frags;
}
return true;
}
void net_pkt_get_info(struct k_mem_slab **rx,
struct k_mem_slab **tx,
struct net_buf_pool **rx_data,
struct net_buf_pool **tx_data)
{
if (rx) {
*rx = &rx_pkts;
}
if (tx) {
*tx = &tx_pkts;
}
if (rx_data) {
*rx_data = &rx_bufs;
}
if (tx_data) {
*tx_data = &tx_bufs;
}
}
#if defined(CONFIG_NET_DEBUG_NET_PKT_ALLOC)
void net_pkt_print(void)
{
NET_DBG("TX %u RX %u RDATA %d TDATA %d",
k_mem_slab_num_free_get(&tx_pkts),
k_mem_slab_num_free_get(&rx_pkts),
get_frees(&rx_bufs), get_frees(&tx_bufs));
}
#endif /* CONFIG_NET_DEBUG_NET_PKT_ALLOC */
/* New allocator and API starts here */
#if defined(CONFIG_NET_BUF_FIXED_DATA_SIZE)
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
static struct net_buf *pkt_alloc_buffer(struct net_buf_pool *pool,
size_t size, s32_t timeout,
const char *caller, int line)
#else
static struct net_buf *pkt_alloc_buffer(struct net_buf_pool *pool,
size_t size, s32_t timeout)
#endif
{
u32_t alloc_start = k_uptime_get_32();
struct net_buf *first = NULL;
struct net_buf *current = NULL;
while (size) {
struct net_buf *new;
new = net_buf_alloc_fixed(pool, timeout);
if (!new) {
goto error;
}
if (!first && !current) {
first = new;
} else {
current->frags = new;
}
current = new;
if (current->size > size) {
current->size = size;
}
size -= current->size;
if (timeout != K_NO_WAIT && timeout != K_FOREVER) {
u32_t diff = k_uptime_get_32() - alloc_start;
timeout -= MIN(timeout, diff);
}
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_FRAG_CHECK_IF_NOT_IN_USE(new, new->ref + 1);
net_pkt_alloc_add(new, false, caller, line);
NET_DBG("%s (%s) [%d] frag %p ref %d (%s():%d)",
pool2str(pool), get_name(pool), get_frees(pool),
new, new->ref, caller, line);
#endif
}
return first;
error:
if (first) {
net_buf_unref(first);
}
return NULL;
}
#else /* !CONFIG_NET_BUF_FIXED_DATA_SIZE */
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
static struct net_buf *pkt_alloc_buffer(struct net_buf_pool *pool,
size_t size, s32_t timeout,
const char *caller, int line)
#else
static struct net_buf *pkt_alloc_buffer(struct net_buf_pool *pool,
size_t size, s32_t timeout)
#endif
{
struct net_buf *buf;
buf = net_buf_alloc_len(pool, size, timeout);
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_FRAG_CHECK_IF_NOT_IN_USE(buf, buf->ref + 1);
net_pkt_alloc_add(buf, false, caller, line);
NET_DBG("%s (%s) [%d] frag %p ref %d (%s():%d)",
pool2str(pool), get_name(pool), get_frees(pool),
buf, buf->ref, caller, line);
#endif
return buf;
}
#endif /* CONFIG_NET_BUF_FIXED_DATA_SIZE */
static size_t pkt_buffer_length(struct net_pkt *pkt,
size_t size,
enum net_ip_protocol proto,
size_t existing)
{
sa_family_t family = net_pkt_family(pkt);
size_t max_len;
if (net_pkt_iface(pkt)) {
max_len = net_if_get_mtu(net_pkt_iface(pkt));
} else {
max_len = 0;
}
/* Family vs iface MTU */
if (IS_ENABLED(CONFIG_NET_IPV6) && family == AF_INET6) {
if (IS_ENABLED(CONFIG_NET_IPV6_FRAGMENT) && (size > max_len)) {
/* We support larger packets if IPv6 fragmentation is
* enabled.
*/
max_len = size;
}
max_len = MAX(max_len, NET_IPV6_MTU);
} else if (IS_ENABLED(CONFIG_NET_IPV4) && family == AF_INET) {
max_len = MAX(max_len, NET_IPV4_MTU);
} else { /* family == AF_UNSPEC */
#if defined (CONFIG_NET_L2_ETHERNET)
if (net_if_l2(net_pkt_iface(pkt)) ==
&NET_L2_GET_NAME(ETHERNET)) {
max_len += sizeof(struct net_eth_hdr);
} else
#endif /* CONFIG_NET_L2_ETHERNET */
{
/* Other L2 are not checked as the pkt MTU in this case
* is based on the IP layer (IPv6 most of the time).
*/
max_len = size;
}
}
max_len -= existing;
return MIN(size, max_len);
}
static size_t pkt_estimate_headers_length(struct net_pkt *pkt,
sa_family_t family,
enum net_ip_protocol proto)
{
size_t hdr_len = 0;
if (family == AF_UNSPEC) {
return 0;
}
/* Family header */
if (IS_ENABLED(CONFIG_NET_IPV6) && family == AF_INET6) {
hdr_len += NET_IPV6H_LEN;
} else if (IS_ENABLED(CONFIG_NET_IPV4) && family == AF_INET) {
hdr_len += NET_IPV4H_LEN;
}
/* + protocol header */
if (IS_ENABLED(CONFIG_NET_TCP) && proto == IPPROTO_TCP) {
hdr_len += NET_TCPH_LEN + NET_TCP_MAX_OPT_SIZE;
} else if (IS_ENABLED(CONFIG_NET_UDP) && proto == IPPROTO_UDP) {
hdr_len += NET_UDPH_LEN;
} else if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
hdr_len += NET_ICMPH_LEN;
}
NET_DBG("HDRs length estimation %zu", hdr_len);
return hdr_len;
}
static size_t pkt_get_size(struct net_pkt *pkt)
{
struct net_buf *buf = pkt->buffer;
size_t size = 0;
while (buf) {
size += buf->size;
buf = buf->frags;
}
return size;
}
size_t net_pkt_available_buffer(struct net_pkt *pkt)
{
if (!pkt) {
return 0;
}
return pkt_get_size(pkt) - net_pkt_get_len(pkt);
}
size_t net_pkt_available_payload_buffer(struct net_pkt *pkt,
enum net_ip_protocol proto)
{
size_t hdr_len = 0;
size_t len;
if (!pkt) {
return 0;
}
hdr_len = pkt_estimate_headers_length(pkt, net_pkt_family(pkt), proto);
len = net_pkt_get_len(pkt);
hdr_len = hdr_len <= len ? 0 : hdr_len - len;
len = net_pkt_available_buffer(pkt) - hdr_len;
return len;
}
void net_pkt_trim_buffer(struct net_pkt *pkt)
{
struct net_buf *buf, *prev;
buf = pkt->buffer;
prev = buf;
while (buf) {
struct net_buf *next = buf->frags;
if (!buf->len) {
if (buf == pkt->buffer) {
pkt->buffer = next;
} else if (buf == prev->frags) {
prev->frags = next;
}
buf->frags = NULL;
net_buf_unref(buf);
} else {
prev = buf;
}
buf = next;
}
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
int net_pkt_alloc_buffer_debug(struct net_pkt *pkt,
size_t size,
enum net_ip_protocol proto,
s32_t timeout,
const char *caller,
int line)
#else
int net_pkt_alloc_buffer(struct net_pkt *pkt,
size_t size,
enum net_ip_protocol proto,
s32_t timeout)
#endif
{
u32_t alloc_start = k_uptime_get_32();
struct net_buf_pool *pool = NULL;
size_t alloc_len = 0;
size_t hdr_len = 0;
struct net_buf *buf;
if (!size && proto == 0 && net_pkt_family(pkt) == AF_UNSPEC) {
return 0;
}
if (k_is_in_isr()) {
timeout = K_NO_WAIT;
}
/* Verifying existing buffer and take into account free space there */
alloc_len = pkt_get_size(pkt) - net_pkt_get_len(pkt);
if (!alloc_len) {
/* In case of no free space, it will account for header
* space estimation
*/
hdr_len = pkt_estimate_headers_length(pkt,
net_pkt_family(pkt),
proto);
}
/* Calculate the maximum that can be allocated depending on size */
alloc_len = pkt_buffer_length(pkt, size + hdr_len, proto, alloc_len);
NET_DBG("Data allocation maximum size %zu (requested %zu)",
alloc_len, size);
if (pkt->context) {
pool = get_data_pool(pkt->context);
}
if (!pool) {
pool = pkt->slab == &tx_pkts ? &tx_bufs : &rx_bufs;
}
if (timeout != K_NO_WAIT && timeout != K_FOREVER) {
u32_t diff = k_uptime_get_32() - alloc_start;
timeout -= MIN(timeout, diff);
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
buf = pkt_alloc_buffer(pool, alloc_len, timeout, caller, line);
#else
buf = pkt_alloc_buffer(pool, alloc_len, timeout);
#endif
if (!buf) {
NET_ERR("Data buffer allocation failed.");
return -ENOMEM;
}
net_pkt_append_buffer(pkt, buf);
return 0;
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
static struct net_pkt *pkt_alloc(struct k_mem_slab *slab, s32_t timeout,
const char *caller, int line)
#else
static struct net_pkt *pkt_alloc(struct k_mem_slab *slab, s32_t timeout)
#endif
{
struct net_pkt *pkt;
int ret;
if (k_is_in_isr()) {
timeout = K_NO_WAIT;
}
ret = k_mem_slab_alloc(slab, (void **)&pkt, timeout);
if (ret) {
return NULL;
}
memset(pkt, 0, sizeof(struct net_pkt));
pkt->atomic_ref = ATOMIC_INIT(1);
pkt->slab = slab;
if (IS_ENABLED(CONFIG_NET_IPV6)) {
net_pkt_set_ipv6_next_hdr(pkt, 255);
}
if (&tx_pkts == slab) {
net_pkt_set_priority(pkt, CONFIG_NET_TX_DEFAULT_PRIORITY);
} else if (&rx_pkts == slab) {
net_pkt_set_priority(pkt, CONFIG_NET_RX_DEFAULT_PRIORITY);
}
if (IS_ENABLED(CONFIG_NET_PKT_RXTIME_STATS) ||
IS_ENABLED(CONFIG_NET_PKT_TXTIME_STATS)) {
struct net_ptp_time tp = {
/* Use the nanosecond field to temporarily
* store the cycle count as it is a 32-bit
* variable. The net_pkt timestamp field is used
* to calculate how long it takes the packet to travel
* between network device driver and application.
*/
.nanosecond = k_cycle_get_32(),
};
net_pkt_set_timestamp(pkt, &tp);
}
net_pkt_set_vlan_tag(pkt, NET_VLAN_TAG_UNSPEC);
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
net_pkt_alloc_add(pkt, true, caller, line);
#endif
net_pkt_cursor_init(pkt);
return pkt;
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_pkt *net_pkt_alloc_debug(s32_t timeout,
const char *caller, int line)
#else
struct net_pkt *net_pkt_alloc(s32_t timeout)
#endif
{
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return pkt_alloc(&tx_pkts, timeout, caller, line);
#else
return pkt_alloc(&tx_pkts, timeout);
#endif
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_pkt *net_pkt_alloc_from_slab_debug(struct k_mem_slab *slab,
s32_t timeout,
const char *caller, int line)
#else
struct net_pkt *net_pkt_alloc_from_slab(struct k_mem_slab *slab,
s32_t timeout)
#endif
{
if (!slab) {
return NULL;
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return pkt_alloc(slab, timeout, caller, line);
#else
return pkt_alloc(slab, timeout);
#endif
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_pkt *net_pkt_rx_alloc_debug(s32_t timeout,
const char *caller, int line)
#else
struct net_pkt *net_pkt_rx_alloc(s32_t timeout)
#endif
{
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return pkt_alloc(&rx_pkts, timeout, caller, line);
#else
return pkt_alloc(&rx_pkts, timeout);
#endif
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
static struct net_pkt *pkt_alloc_on_iface(struct k_mem_slab *slab,
struct net_if *iface, s32_t timeout,
const char *caller, int line)
#else
static struct net_pkt *pkt_alloc_on_iface(struct k_mem_slab *slab,
struct net_if *iface, s32_t timeout)
#endif
{
struct net_pkt *pkt;
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
pkt = pkt_alloc(slab, timeout, caller, line);
#else
pkt = pkt_alloc(slab, timeout);
#endif
if (pkt) {
net_pkt_set_iface(pkt, iface);
}
return pkt;
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_pkt *net_pkt_alloc_on_iface_debug(struct net_if *iface,
s32_t timeout,
const char *caller,
int line)
#else
struct net_pkt *net_pkt_alloc_on_iface(struct net_if *iface, s32_t timeout)
#endif
{
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return pkt_alloc_on_iface(&tx_pkts, iface, timeout, caller, line);
#else
return pkt_alloc_on_iface(&tx_pkts, iface, timeout);
#endif
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_pkt *net_pkt_rx_alloc_on_iface_debug(struct net_if *iface,
s32_t timeout,
const char *caller,
int line)
#else
struct net_pkt *net_pkt_rx_alloc_on_iface(struct net_if *iface, s32_t timeout)
#endif
{
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return pkt_alloc_on_iface(&rx_pkts, iface, timeout, caller, line);
#else
return pkt_alloc_on_iface(&rx_pkts, iface, timeout);
#endif
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
static struct net_pkt *
pkt_alloc_with_buffer(struct k_mem_slab *slab,
struct net_if *iface,
size_t size,
sa_family_t family,
enum net_ip_protocol proto,
s32_t timeout,
const char *caller,
int line)
#else
static struct net_pkt *
pkt_alloc_with_buffer(struct k_mem_slab *slab,
struct net_if *iface,
size_t size,
sa_family_t family,
enum net_ip_protocol proto,
s32_t timeout)
#endif
{
u32_t alloc_start = k_uptime_get_32();
struct net_pkt *pkt;
int ret;
NET_DBG("On iface %p size %zu", iface, size);
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
pkt = pkt_alloc_on_iface(slab, iface, timeout, caller, line);
#else
pkt = pkt_alloc_on_iface(slab, iface, timeout);
#endif
if (!pkt) {
return NULL;
}
net_pkt_set_family(pkt, family);
if (timeout != K_NO_WAIT && timeout != K_FOREVER) {
u32_t diff = k_uptime_get_32() - alloc_start;
timeout -= MIN(timeout, diff);
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
ret = net_pkt_alloc_buffer_debug(pkt, size, proto, timeout,
caller, line);
#else
ret = net_pkt_alloc_buffer(pkt, size, proto, timeout);
#endif
if (ret) {
net_pkt_unref(pkt);
return NULL;
}
return pkt;
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_pkt *net_pkt_alloc_with_buffer_debug(struct net_if *iface,
size_t size,
sa_family_t family,
enum net_ip_protocol proto,
s32_t timeout,
const char *caller,
int line)
#else
struct net_pkt *net_pkt_alloc_with_buffer(struct net_if *iface,
size_t size,
sa_family_t family,
enum net_ip_protocol proto,
s32_t timeout)
#endif
{
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return pkt_alloc_with_buffer(&tx_pkts, iface, size, family,
proto, timeout, caller, line);
#else
return pkt_alloc_with_buffer(&tx_pkts, iface, size, family,
proto, timeout);
#endif
}
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
struct net_pkt *net_pkt_rx_alloc_with_buffer_debug(struct net_if *iface,
size_t size,
sa_family_t family,
enum net_ip_protocol proto,
s32_t timeout,
const char *caller,
int line)
#else
struct net_pkt *net_pkt_rx_alloc_with_buffer(struct net_if *iface,
size_t size,
sa_family_t family,
enum net_ip_protocol proto,
s32_t timeout)
#endif
{
#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
return pkt_alloc_with_buffer(&rx_pkts, iface, size, family,
proto, timeout, caller, line);
#else
return pkt_alloc_with_buffer(&rx_pkts, iface, size, family,
proto, timeout);
#endif
}
void net_pkt_append_buffer(struct net_pkt *pkt, struct net_buf *buffer)
{
if (!pkt->buffer) {
pkt->buffer = buffer;
net_pkt_cursor_init(pkt);
} else {
net_buf_frag_insert(net_buf_frag_last(pkt->buffer), buffer);
}
}
void net_pkt_cursor_init(struct net_pkt *pkt)
{
pkt->cursor.buf = pkt->buffer;
if (pkt->cursor.buf) {
pkt->cursor.pos = pkt->cursor.buf->data;
} else {
pkt->cursor.pos = NULL;
}
}
static void pkt_cursor_jump(struct net_pkt *pkt, bool write)
{
struct net_pkt_cursor *cursor = &pkt->cursor;
cursor->buf = cursor->buf->frags;
while (cursor->buf) {
size_t len = write ? cursor->buf->size : cursor->buf->len;
if (!len) {
cursor->buf = cursor->buf->frags;
} else {
break;
}
}
if (cursor->buf) {
cursor->pos = cursor->buf->data;
} else {
cursor->pos = NULL;
}
}
static void pkt_cursor_advance(struct net_pkt *pkt, bool write)
{
struct net_pkt_cursor *cursor = &pkt->cursor;
size_t len;
if (!cursor->buf) {
return;
}
len = write ? cursor->buf->size : cursor->buf->len;
if ((cursor->pos - cursor->buf->data) == len) {
pkt_cursor_jump(pkt, write);
}
}
static void pkt_cursor_update(struct net_pkt *pkt,
size_t length, bool write)
{
struct net_pkt_cursor *cursor = &pkt->cursor;
size_t len;
if (net_pkt_is_being_overwritten(pkt)) {
write = false;
}
len = write ? cursor->buf->size : cursor->buf->len;
if (length + (cursor->pos - cursor->buf->data) == len &&
!(net_pkt_is_being_overwritten(pkt) && len < cursor->buf->size)) {
pkt_cursor_jump(pkt, write);
} else {
cursor->pos += length;
}
}
/* Internal function that does all operation (skip/read/write/memset) */
static int net_pkt_cursor_operate(struct net_pkt *pkt,
void *data, size_t length,
bool copy, bool write)
{
/* We use such variable to avoid lengthy lines */
struct net_pkt_cursor *c_op = &pkt->cursor;
while (c_op->buf && length) {
size_t d_len, len;
pkt_cursor_advance(pkt, net_pkt_is_being_overwritten(pkt) ?
false : write);
if (c_op->buf == NULL) {
break;
}
if (write && !net_pkt_is_being_overwritten(pkt)) {
d_len = c_op->buf->size - (c_op->pos - c_op->buf->data);
} else {
d_len = c_op->buf->len - (c_op->pos - c_op->buf->data);
}
if (!d_len) {
break;
}
if (length < d_len) {
len = length;
} else {
len = d_len;
}
if (copy) {
memcpy(write ? c_op->pos : data,
write ? data : c_op->pos,
len);
} else if (data) {
memset(c_op->pos, *(int *)data, len);
}
if (write && !net_pkt_is_being_overwritten(pkt)) {
net_buf_add(c_op->buf, len);
}
pkt_cursor_update(pkt, len, write);
if (copy && data) {
data = (u8_t *) data + len;
}
length -= len;
}
if (length) {
NET_DBG("Still some length to go %zu", length);
return -ENOBUFS;
}
return 0;
}
int net_pkt_skip(struct net_pkt *pkt, size_t skip)
{
NET_DBG("pkt %p skip %zu", pkt, skip);
return net_pkt_cursor_operate(pkt, NULL, skip, false, true);
}
int net_pkt_memset(struct net_pkt *pkt, int byte, size_t amount)
{
NET_DBG("pkt %p byte %d amount %zu", pkt, byte, amount);
return net_pkt_cursor_operate(pkt, &byte, amount, false, true);
}
int net_pkt_read(struct net_pkt *pkt, void *data, size_t length)
{
NET_DBG("pkt %p data %p length %zu", pkt, data, length);
return net_pkt_cursor_operate(pkt, data, length, true, false);
}
int net_pkt_read_be16(struct net_pkt *pkt, u16_t *data)
{
u8_t d16[2];
int ret;
ret = net_pkt_read(pkt, d16, sizeof(u16_t));
*data = d16[0] << 8 | d16[1];
return ret;
}
int net_pkt_read_le16(struct net_pkt *pkt, u16_t *data)
{
u8_t d16[2];
int ret;
ret = net_pkt_read(pkt, d16, sizeof(u16_t));
*data = d16[1] << 8 | d16[0];
return ret;
}
int net_pkt_read_be32(struct net_pkt *pkt, u32_t *data)
{
u8_t d32[4];
int ret;
ret = net_pkt_read(pkt, d32, sizeof(u32_t));
*data = d32[0] << 24 | d32[1] << 16 | d32[2] << 8 | d32[3];
return ret;
}
int net_pkt_write(struct net_pkt *pkt, const void *data, size_t length)
{
NET_DBG("pkt %p data %p length %zu", pkt, data, length);
if (data == pkt->cursor.pos && net_pkt_is_contiguous(pkt, length)) {
return net_pkt_skip(pkt, length);
}
return net_pkt_cursor_operate(pkt, (void *)data, length, true, true);
}
int net_pkt_copy(struct net_pkt *pkt_dst,
struct net_pkt *pkt_src,
size_t length)
{
struct net_pkt_cursor *c_dst = &pkt_dst->cursor;
struct net_pkt_cursor *c_src = &pkt_src->cursor;
while (c_dst->buf && c_src->buf && length) {
size_t s_len, d_len, len;
pkt_cursor_advance(pkt_dst, true);
pkt_cursor_advance(pkt_src, false);
if (!c_dst->buf || !c_src->buf) {
break;
}
s_len = c_src->buf->len - (c_src->pos - c_src->buf->data);
d_len = c_dst->buf->size - (c_dst->pos - c_dst->buf->data);
if (length < s_len && length < d_len) {
len = length;
} else {
if (d_len < s_len) {
len = d_len;
} else {
len = s_len;
}
}
if (!len) {
break;
}
memcpy(c_dst->pos, c_src->pos, len);
if (!net_pkt_is_being_overwritten(pkt_dst)) {
net_buf_add(c_dst->buf, len);
}
pkt_cursor_update(pkt_dst, len, true);
pkt_cursor_update(pkt_src, len, false);
length -= len;
}
if (length) {
NET_DBG("Still some length to go %zu", length);
return -ENOBUFS;
}
return 0;
}
static void clone_pkt_attributes(struct net_pkt *pkt, struct net_pkt *clone_pkt)
{
net_pkt_set_family(clone_pkt, net_pkt_family(pkt));
net_pkt_set_context(clone_pkt, net_pkt_context(pkt));
net_pkt_set_ip_hdr_len(clone_pkt, net_pkt_ip_hdr_len(pkt));
net_pkt_set_vlan_tag(clone_pkt, net_pkt_vlan_tag(pkt));
net_pkt_set_timestamp(clone_pkt, net_pkt_timestamp(pkt));
net_pkt_set_priority(clone_pkt, net_pkt_priority(pkt));
net_pkt_set_orig_iface(clone_pkt, net_pkt_orig_iface(pkt));
if (IS_ENABLED(CONFIG_NET_IPV4) && net_pkt_family(pkt) == AF_INET) {
net_pkt_set_ipv4_ttl(clone_pkt, net_pkt_ipv4_ttl(pkt));
net_pkt_set_ipv4_opts_len(clone_pkt,
net_pkt_ipv4_opts_len(pkt));
} else if (IS_ENABLED(CONFIG_NET_IPV6) &&
net_pkt_family(pkt) == AF_INET6) {
net_pkt_set_ipv6_hop_limit(clone_pkt,
net_pkt_ipv6_hop_limit(pkt));
net_pkt_set_ipv6_ext_len(clone_pkt, net_pkt_ipv6_ext_len(pkt));
net_pkt_set_ipv6_ext_opt_len(clone_pkt,
net_pkt_ipv6_ext_opt_len(pkt));
net_pkt_set_ipv6_hdr_prev(clone_pkt,
net_pkt_ipv6_hdr_prev(pkt));
net_pkt_set_ipv6_next_hdr(clone_pkt,
net_pkt_ipv6_next_hdr(pkt));
}
}
struct net_pkt *net_pkt_clone(struct net_pkt *pkt, s32_t timeout)
{
size_t cursor_offset = net_pkt_get_current_offset(pkt);
struct net_pkt *clone_pkt;
struct net_pkt_cursor backup;
clone_pkt = net_pkt_alloc_with_buffer(net_pkt_iface(pkt),
net_pkt_get_len(pkt),
AF_UNSPEC, 0, timeout);
if (!clone_pkt) {
return NULL;
}
net_pkt_cursor_backup(pkt, &backup);
net_pkt_cursor_init(pkt);
if (net_pkt_copy(clone_pkt, pkt, net_pkt_get_len(pkt))) {
net_pkt_unref(clone_pkt);
net_pkt_cursor_restore(pkt, &backup);
return NULL;
}
if (clone_pkt->buffer) {
/* The link header pointers are only usable if there is
* a buffer that we copied because those pointers point
* to start of the fragment which we do not have right now.
*/
memcpy(&clone_pkt->lladdr_src, &pkt->lladdr_src,
sizeof(clone_pkt->lladdr_src));
memcpy(&clone_pkt->lladdr_dst, &pkt->lladdr_dst,
sizeof(clone_pkt->lladdr_dst));
}
clone_pkt_attributes(pkt, clone_pkt);
net_pkt_cursor_init(clone_pkt);
if (cursor_offset) {
net_pkt_set_overwrite(clone_pkt, true);
net_pkt_skip(clone_pkt, cursor_offset);
}
net_pkt_cursor_restore(pkt, &backup);
NET_DBG("Cloned %p to %p", pkt, clone_pkt);
return clone_pkt;
}
struct net_pkt *net_pkt_shallow_clone(struct net_pkt *pkt, s32_t timeout)
{
struct net_pkt *clone_pkt;
struct net_buf *buf;
clone_pkt = net_pkt_alloc(timeout);
if (!clone_pkt) {
return NULL;
}
net_pkt_set_iface(clone_pkt, net_pkt_iface(pkt));
clone_pkt->buffer = pkt->buffer;
buf = pkt->buffer;
while (buf) {
net_pkt_frag_ref(buf);
buf = buf->frags;
}
if (pkt->buffer) {
/* The link header pointers are only usable if there is
* a buffer that we copied because those pointers point
* to start of the fragment which we do not have right now.
*/
memcpy(&clone_pkt->lladdr_src, &pkt->lladdr_src,
sizeof(clone_pkt->lladdr_src));
memcpy(&clone_pkt->lladdr_dst, &pkt->lladdr_dst,
sizeof(clone_pkt->lladdr_dst));
}
clone_pkt_attributes(pkt, clone_pkt);
net_pkt_cursor_restore(clone_pkt, &pkt->cursor);
NET_DBG("Shallow cloned %p to %p", pkt, clone_pkt);
return clone_pkt;
}
size_t net_pkt_remaining_data(struct net_pkt *pkt)
{
struct net_buf *buf;
size_t data_length;
if (!pkt || !pkt->cursor.buf || !pkt->cursor.pos) {
return 0;
}
buf = pkt->cursor.buf;
data_length = buf->len - (pkt->cursor.pos - buf->data);
buf = buf->frags;
while (buf) {
data_length += buf->len;
buf = buf->frags;
}
return data_length;
}
int net_pkt_update_length(struct net_pkt *pkt, size_t length)
{
struct net_buf *buf;
for (buf = pkt->buffer; buf; buf = buf->frags) {
if (buf->len < length) {
length -= buf->len;
} else {
buf->len = length;
length = 0;
}
}
return !length ? 0 : -EINVAL;
}
int net_pkt_pull(struct net_pkt *pkt, size_t length)
{
struct net_pkt_cursor *c_op = &pkt->cursor;
struct net_pkt_cursor backup;
net_pkt_cursor_backup(pkt, &backup);
while (length) {
size_t left, rem;
pkt_cursor_advance(pkt, false);
left = c_op->buf->len - (c_op->pos - c_op->buf->data);
if (!left) {
break;
}
rem = left;
if (rem > length) {
rem = length;
}
c_op->buf->len -= rem;
left -= rem;
if (left) {
memmove(c_op->pos, c_op->pos+rem, left);
}
/* For now, empty buffer are not freed, and there is no
* compaction done either.
* net_pkt_pull() is currently used only in very specific
* places where such memory optimization would not make
* that much sense. Let's see in future if it's worth do to it.
*/
length -= rem;
}
net_pkt_cursor_restore(pkt, &backup);
if (length) {
NET_DBG("Still some length to go %zu", length);
return -ENOBUFS;
}
return 0;
}
u16_t net_pkt_get_current_offset(struct net_pkt *pkt)
{
struct net_buf *buf = pkt->buffer;
u16_t offset;
if (!pkt->cursor.buf || !pkt->cursor.pos) {
return 0;
}
offset = 0U;
while (buf != pkt->cursor.buf) {
offset += buf->len;
buf = buf->frags;
}
offset += pkt->cursor.pos - buf->data;
return offset;
}
bool net_pkt_is_contiguous(struct net_pkt *pkt, size_t size)
{
pkt_cursor_advance(pkt, !net_pkt_is_being_overwritten(pkt));
if (pkt->cursor.buf && pkt->cursor.pos) {
size_t len;
len = net_pkt_is_being_overwritten(pkt) ?
pkt->cursor.buf->len : pkt->cursor.buf->size;
len -= pkt->cursor.pos - pkt->cursor.buf->data;
if (len >= size) {
return true;
}
}
return false;
}
void *net_pkt_get_data(struct net_pkt *pkt,
struct net_pkt_data_access *access)
{
if (IS_ENABLED(CONFIG_NET_HEADERS_ALWAYS_CONTIGUOUS)) {
if (!net_pkt_is_contiguous(pkt, access->size)) {
return NULL;
}
return pkt->cursor.pos;
} else {
if (net_pkt_is_contiguous(pkt, access->size)) {
access->data = pkt->cursor.pos;
} else if (net_pkt_is_being_overwritten(pkt)) {
struct net_pkt_cursor backup;
if (!access->data) {
NET_ERR("Uncontiguous data"
" cannot be linearized");
return NULL;
}
net_pkt_cursor_backup(pkt, &backup);
if (net_pkt_read(pkt, access->data, access->size)) {
net_pkt_cursor_restore(pkt, &backup);
return NULL;
}
net_pkt_cursor_restore(pkt, &backup);
}
return access->data;
}
return NULL;
}
int net_pkt_set_data(struct net_pkt *pkt,
struct net_pkt_data_access *access)
{
if (IS_ENABLED(CONFIG_NET_HEADERS_ALWAYS_CONTIGUOUS)) {
return net_pkt_skip(pkt, access->size);
}
return net_pkt_write(pkt, access->data, access->size);
}
void net_pkt_init(void)
{
#if CONFIG_NET_PKT_LOG_LEVEL >= LOG_LEVEL_DBG
NET_DBG("Allocating %u RX (%zu bytes), %u TX (%zu bytes), "
"%d RX data (%u bytes) and %d TX data (%u bytes) buffers",
k_mem_slab_num_free_get(&rx_pkts),
(size_t)(k_mem_slab_num_free_get(&rx_pkts) *
sizeof(struct net_pkt)),
k_mem_slab_num_free_get(&tx_pkts),
(size_t)(k_mem_slab_num_free_get(&tx_pkts) *
sizeof(struct net_pkt)),
get_frees(&rx_bufs), get_size(&rx_bufs),
get_frees(&tx_bufs), get_size(&tx_bufs));
#endif
}