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net_context.c
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net_context.c
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/** @file
* @brief Network context API
*
* An API for applications to define a network connection.
*/
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#if defined(CONFIG_NET_DEBUG_CONTEXT)
#define SYS_LOG_DOMAIN "net/ctx"
#define NET_LOG_ENABLED 1
#endif
#include <kernel.h>
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include <net/net_pkt.h>
#include <net/net_ip.h>
#include <net/net_context.h>
#include <net/net_offload.h>
#include "connection.h"
#include "net_private.h"
#include "ipv6.h"
#include "ipv4.h"
#include "udp_internal.h"
#include "tcp.h"
#include "net_stats.h"
#define NET_MAX_CONTEXT CONFIG_NET_MAX_CONTEXTS
#if defined(CONFIG_NET_TCP_ACK_TIMEOUT)
#define ACK_TIMEOUT CONFIG_NET_TCP_ACK_TIMEOUT
#else
#define ACK_TIMEOUT K_SECONDS(1)
#endif
#define FIN_TIMEOUT K_SECONDS(1)
/* Declares a wrapper function for a net_conn callback that refs the
* context around the invocation (to protect it from premature
* deletion). Long term would be nice to see this feature be part of
* the connection type itself, but right now it has opaque "user_data"
* pointers and doesn't understand what a net_context is.
*/
#define NET_CONN_CB(name) \
static enum net_verdict _##name(struct net_conn *conn, \
struct net_pkt *pkt, \
void *user_data); \
static enum net_verdict name(struct net_conn *conn, \
struct net_pkt *pkt, \
void *user_data) \
{ \
enum net_verdict result; \
\
net_context_ref(user_data); \
result = _##name(conn, pkt, user_data); \
net_context_unref(user_data); \
return result; \
} \
static enum net_verdict _##name(struct net_conn *conn, \
struct net_pkt *pkt, \
void *user_data) \
static struct net_context contexts[NET_MAX_CONTEXT];
/* We need to lock the contexts array as these APIs are typically called
* from applications which are usually run in task context.
*/
static struct k_sem contexts_lock;
static enum net_verdict packet_received(struct net_conn *conn,
struct net_pkt *pkt,
void *user_data);
static void set_appdata_values(struct net_pkt *pkt, enum net_ip_protocol proto);
#if defined(CONFIG_NET_TCP)
static int send_reset(struct net_context *context, struct sockaddr *remote);
static struct tcp_backlog_entry {
struct net_tcp *tcp;
struct sockaddr remote;
u32_t recv_max_ack;
u32_t send_seq;
u32_t send_ack;
struct k_delayed_work ack_timer;
bool cancelled;
} tcp_backlog[CONFIG_NET_TCP_BACKLOG_SIZE];
static void backlog_ack_timeout(struct k_work *work)
{
struct tcp_backlog_entry *backlog =
CONTAINER_OF(work, struct tcp_backlog_entry, ack_timer);
if (!backlog->cancelled) {
NET_DBG("Did not receive ACK in %dms", ACK_TIMEOUT);
send_reset(backlog->tcp->context, &backlog->remote);
}
memset(backlog, 0, sizeof(struct tcp_backlog_entry));
}
static struct sockaddr *create_sockaddr(struct net_pkt *pkt,
struct sockaddr *addr)
{
struct net_tcp_hdr hdr, *tcp_hdr;
tcp_hdr = net_tcp_get_hdr(pkt, &hdr);
if (!tcp_hdr) {
return NULL;
}
#if defined(CONFIG_NET_IPV6)
if (net_pkt_family(pkt) == AF_INET6) {
net_ipaddr_copy(&net_sin6(addr)->sin6_addr,
&NET_IPV6_HDR(pkt)->src);
net_sin6(addr)->sin6_port = tcp_hdr->src_port;
net_sin6(addr)->sin6_family = AF_INET6;
} else
#endif
#if defined(CONFIG_NET_IPV4)
if (net_pkt_family(pkt) == AF_INET) {
net_ipaddr_copy(&net_sin(addr)->sin_addr,
&NET_IPV4_HDR(pkt)->src);
net_sin(addr)->sin_port = tcp_hdr->src_port;
net_sin(addr)->sin_family = AF_INET;
} else
#endif
{
return NULL;
}
return addr;
}
static int tcp_backlog_find(struct net_pkt *pkt, int *empty_slot)
{
struct net_tcp_hdr hdr, *tcp_hdr;
int i, empty = -1;
for (i = 0; i < CONFIG_NET_TCP_BACKLOG_SIZE; i++) {
if (tcp_backlog[i].tcp == NULL && empty < 0) {
empty = i;
continue;
}
if (net_pkt_family(pkt) != tcp_backlog[i].remote.family) {
continue;
}
tcp_hdr = net_tcp_get_hdr(pkt, &hdr);
switch (net_pkt_family(pkt)) {
#if defined(CONFIG_NET_IPV6)
case AF_INET6:
if (net_sin6(&tcp_backlog[i].remote)->sin6_port !=
tcp_hdr->src_port) {
continue;
}
if (memcmp(&net_sin6(&tcp_backlog[i].remote)->sin6_addr,
&NET_IPV6_HDR(pkt)->src,
sizeof(struct in6_addr))) {
continue;
}
break;
#endif
#if defined(CONFIG_NET_IPV4)
case AF_INET:
if (net_sin(&tcp_backlog[i].remote)->sin_port !=
tcp_hdr->src_port) {
continue;
}
if (memcmp(&net_sin(&tcp_backlog[i].remote)->sin_addr,
&NET_IPV4_HDR(pkt)->src,
sizeof(struct in_addr))) {
continue;
}
break;
#endif
}
return i;
}
if (empty_slot) {
*empty_slot = empty;
}
return -EADDRNOTAVAIL;
}
static int tcp_backlog_syn(struct net_pkt *pkt, struct net_context *context)
{
int empty_slot = -1;
if (tcp_backlog_find(pkt, &empty_slot) >= 0) {
return -EADDRINUSE;
}
if (empty_slot < 0) {
return -ENOSPC;
}
tcp_backlog[empty_slot].tcp = context->tcp;
create_sockaddr(pkt, &tcp_backlog[empty_slot].remote);
tcp_backlog[empty_slot].recv_max_ack = context->tcp->recv_max_ack;
tcp_backlog[empty_slot].send_seq = context->tcp->send_seq;
tcp_backlog[empty_slot].send_ack = context->tcp->send_ack;
k_delayed_work_init(&tcp_backlog[empty_slot].ack_timer,
backlog_ack_timeout);
k_delayed_work_submit(&tcp_backlog[empty_slot].ack_timer, ACK_TIMEOUT);
return 0;
}
static int tcp_backlog_ack(struct net_pkt *pkt, struct net_context *context)
{
struct net_tcp_hdr hdr, *tcp_hdr;
int r;
r = tcp_backlog_find(pkt, NULL);
if (r < 0) {
return r;
}
tcp_hdr = net_tcp_get_hdr(pkt, &hdr);
if (!tcp_hdr) {
return -EINVAL;
}
/* Sent SEQ + 1 needs to be the same as the received ACK */
if (tcp_backlog[r].send_seq + 1 != sys_get_be32(tcp_hdr->ack)) {
return -EINVAL;
}
memcpy(&context->remote, &tcp_backlog[r].remote,
sizeof(struct sockaddr));
context->tcp->recv_max_ack = tcp_backlog[r].recv_max_ack;
context->tcp->send_seq = tcp_backlog[r].send_seq;
context->tcp->send_ack = tcp_backlog[r].send_ack;
if (k_delayed_work_cancel(&tcp_backlog[r].ack_timer) < 0) {
/* Too late to cancel - just set flag for worker.
* TODO: Note that in this case, we can be preempted
* anytime (could have been preempted even before we did
* the check), so access to tcp_backlog should be synchronized
* between this function and worker.
*/
tcp_backlog[r].cancelled = true;
} else {
memset(&tcp_backlog[r], 0, sizeof(struct tcp_backlog_entry));
}
return 0;
}
static int tcp_backlog_rst(struct net_pkt *pkt)
{
struct net_tcp_hdr hdr, *tcp_hdr;
int r;
r = tcp_backlog_find(pkt, NULL);
if (r < 0) {
return r;
}
tcp_hdr = net_tcp_get_hdr(pkt, &hdr);
if (!tcp_hdr) {
return -EINVAL;
}
/* The ACK sent needs to be the same as the received SEQ */
if (tcp_backlog[r].send_ack != sys_get_be32(tcp_hdr->seq)) {
return -EINVAL;
}
if (k_delayed_work_cancel(&tcp_backlog[r].ack_timer) < 0) {
/* Too late to cancel - just set flag for worker.
* TODO: Note that in this case, we can be preempted
* anytime (could have been preempted even before we did
* the check), so access to tcp_backlog should be synchronized
* between this function and worker.
*/
tcp_backlog[r].cancelled = true;
} else {
memset(&tcp_backlog[r], 0, sizeof(struct tcp_backlog_entry));
}
return 0;
}
static void handle_fin_timeout(struct k_work *work)
{
struct net_tcp *tcp =
CONTAINER_OF(work, struct net_tcp, fin_timer);
if (!tcp->fin_timer_cancelled) {
NET_DBG("Did not receive FIN in %dms", FIN_TIMEOUT);
net_context_unref(tcp->context);
}
}
static void handle_ack_timeout(struct k_work *work)
{
/* This means that we did not receive ACK response in time. */
struct net_tcp *tcp = CONTAINER_OF(work, struct net_tcp, ack_timer);
if (tcp->ack_timer_cancelled) {
return;
}
NET_DBG("Did not receive ACK in %dms while in %s", ACK_TIMEOUT,
net_tcp_state_str(net_tcp_get_state(tcp)));
if (net_tcp_get_state(tcp) == NET_TCP_LAST_ACK) {
/* We did not receive the last ACK on time. We can only
* close the connection at this point. We will not send
* anything to peer in this last state, but will go directly
* to to CLOSED state.
*/
net_tcp_change_state(tcp, NET_TCP_CLOSED);
net_context_unref(tcp->context);
}
}
#endif /* CONFIG_NET_TCP */
static int check_used_port(enum net_ip_protocol ip_proto,
u16_t local_port,
const struct sockaddr *local_addr)
{
int i;
for (i = 0; i < NET_MAX_CONTEXT; i++) {
if (!net_context_is_used(&contexts[i])) {
continue;
}
if (!(net_context_get_ip_proto(&contexts[i]) == ip_proto &&
net_sin((struct sockaddr *)&
contexts[i].local)->sin_port == local_port)) {
continue;
}
if (local_addr->family == AF_INET6) {
if (net_ipv6_addr_cmp(
net_sin6_ptr(&contexts[i].local)->
sin6_addr,
&((struct sockaddr_in6 *)
local_addr)->sin6_addr)) {
return -EEXIST;
}
} else {
if (net_ipv4_addr_cmp(
net_sin_ptr(&contexts[i].local)->
sin_addr,
&((struct sockaddr_in *)
local_addr)->sin_addr)) {
return -EEXIST;
}
}
}
return 0;
}
static u16_t find_available_port(struct net_context *context,
const struct sockaddr *addr)
{
if (!net_sin(addr)->sin_port) {
u16_t local_port;
do {
local_port = sys_rand32_get() | 0x8000;
if (local_port <= 1023) {
/* 0 - 1023 ports are reserved */
continue;
}
} while (check_used_port(
net_context_get_ip_proto(context),
htons(local_port), addr) == -EEXIST);
return htons(local_port);
}
return net_sin(addr)->sin_port;
}
int net_context_get(sa_family_t family,
enum net_sock_type type,
enum net_ip_protocol ip_proto,
struct net_context **context)
{
int i, ret = -ENOENT;
#if defined(CONFIG_NET_CONTEXT_CHECK)
#if !defined(CONFIG_NET_IPV4)
if (family == AF_INET) {
NET_ASSERT_INFO(family != AF_INET, "IPv4 disabled");
return -EPFNOSUPPORT;
}
#endif
#if !defined(CONFIG_NET_IPV6)
if (family == AF_INET6) {
NET_ASSERT_INFO(family != AF_INET6, "IPv6 disabled");
return -EPFNOSUPPORT;
}
#endif
#if !defined(CONFIG_NET_UDP)
if (type == SOCK_DGRAM) {
NET_ASSERT_INFO(type != SOCK_DGRAM,
"Datagram context disabled");
return -EPROTOTYPE;
}
if (ip_proto == IPPROTO_UDP) {
NET_ASSERT_INFO(ip_proto != IPPROTO_UDP, "UDP disabled");
return -EPROTONOSUPPORT;
}
#endif
#if !defined(CONFIG_NET_TCP)
if (type == SOCK_STREAM) {
NET_ASSERT_INFO(type != SOCK_STREAM,
"Stream context disabled");
return -EPROTOTYPE;
}
if (ip_proto == IPPROTO_TCP) {
NET_ASSERT_INFO(ip_proto != IPPROTO_TCP, "TCP disabled");
return -EPROTONOSUPPORT;
}
#endif
if (family != AF_INET && family != AF_INET6) {
NET_ASSERT_INFO(family == AF_INET || family == AF_INET6,
"Unknown address family %d", family);
return -EAFNOSUPPORT;
}
if (type != SOCK_DGRAM && type != SOCK_STREAM) {
NET_ASSERT_INFO(type == SOCK_DGRAM || type == SOCK_STREAM,
"Unknown context type");
return -EPROTOTYPE;
}
if (ip_proto != IPPROTO_UDP && ip_proto != IPPROTO_TCP) {
NET_ASSERT_INFO(ip_proto == IPPROTO_UDP ||
ip_proto == IPPROTO_TCP,
"Unknown IP protocol %d", ip_proto);
return -EPROTONOSUPPORT;
}
if ((type == SOCK_STREAM && ip_proto == IPPROTO_UDP) ||
(type == SOCK_DGRAM && ip_proto == IPPROTO_TCP)) {
NET_ASSERT_INFO(\
(type != SOCK_STREAM || ip_proto != IPPROTO_UDP) &&
(type != SOCK_DGRAM || ip_proto != IPPROTO_TCP),
"Context type and protocol mismatch, type %d proto %d",
type, ip_proto);
return -EOPNOTSUPP;
}
if (!context) {
NET_ASSERT_INFO(context, "Invalid context");
return -EINVAL;
}
#endif /* CONFIG_NET_CONTEXT_CHECK */
k_sem_take(&contexts_lock, K_FOREVER);
for (i = 0; i < NET_MAX_CONTEXT; i++) {
if (net_context_is_used(&contexts[i])) {
continue;
}
#if defined(CONFIG_NET_TCP)
if (ip_proto == IPPROTO_TCP) {
contexts[i].tcp = net_tcp_alloc(&contexts[i]);
if (!contexts[i].tcp) {
NET_ASSERT_INFO(contexts[i].tcp,
"Cannot allocate TCP context");
return -ENOBUFS;
}
k_delayed_work_init(&contexts[i].tcp->ack_timer,
handle_ack_timeout);
k_delayed_work_init(&contexts[i].tcp->fin_timer,
handle_fin_timeout);
}
#endif /* CONFIG_NET_TCP */
contexts[i].flags = 0;
atomic_set(&contexts[i].refcount, 1);
net_context_set_family(&contexts[i], family);
net_context_set_type(&contexts[i], type);
net_context_set_ip_proto(&contexts[i], ip_proto);
contexts[i].flags |= NET_CONTEXT_IN_USE;
contexts[i].iface = 0;
memset(&contexts[i].remote, 0, sizeof(struct sockaddr));
memset(&contexts[i].local, 0, sizeof(struct sockaddr_ptr));
#if defined(CONFIG_NET_IPV6)
if (family == AF_INET6) {
struct sockaddr_in6 *addr6 = (struct sockaddr_in6
*)&contexts[i].local;
addr6->sin6_port = find_available_port(&contexts[i],
(struct sockaddr *)addr6);
if (!addr6->sin6_port) {
return -EADDRINUSE;
}
}
#endif
#if defined(CONFIG_NET_IPV4)
if (family == AF_INET) {
struct sockaddr_in *addr = (struct sockaddr_in
*)&contexts[i].local;
addr->sin_port = find_available_port(&contexts[i],
(struct sockaddr *)addr);
if (!addr->sin_port) {
return -EADDRINUSE;
}
}
#endif
#if defined(CONFIG_NET_CONTEXT_SYNC_RECV)
k_sem_init(&contexts[i].recv_data_wait, 0, UINT_MAX);
k_sem_give(&contexts[i].recv_data_wait);
#endif /* CONFIG_NET_CONTEXT_SYNC_RECV */
*context = &contexts[i];
ret = 0;
break;
}
k_sem_give(&contexts_lock);
#if defined(CONFIG_NET_OFFLOAD)
/* FIXME - Figure out a way to get the correct network interface
* as it is not known at this point yet.
*/
if (!ret && net_if_is_ip_offloaded(net_if_get_default())) {
ret = net_offload_get(net_if_get_default(),
family,
type,
ip_proto,
context);
if (ret < 0) {
(*context)->flags &= ~NET_CONTEXT_IN_USE;
*context = NULL;
}
return ret;
}
#endif /* CONFIG_NET_OFFLOAD */
return ret;
}
#if defined(CONFIG_NET_TCP)
static void queue_fin(struct net_context *ctx)
{
struct net_pkt *pkt = NULL;
int ret;
ret = net_tcp_prepare_segment(ctx->tcp, NET_TCP_FIN, NULL, 0,
NULL, &ctx->remote, &pkt);
if (ret || !pkt) {
return;
}
ret = net_tcp_send_pkt(pkt);
if (ret < 0) {
net_pkt_unref(pkt);
}
}
#endif /* CONFIG_NET_TCP */
int net_context_ref(struct net_context *context)
{
int old_rc = atomic_inc(&context->refcount);
return old_rc + 1;
}
int net_context_unref(struct net_context *context)
{
int old_rc = atomic_dec(&context->refcount);
if (old_rc != 1) {
return old_rc - 1;
}
k_sem_take(&contexts_lock, K_FOREVER);
#if defined(CONFIG_NET_TCP)
if (context->tcp) {
net_tcp_release(context->tcp);
context->tcp = NULL;
}
#endif /* CONFIG_NET_TCP */
if (context->conn_handler) {
net_conn_unregister(context->conn_handler);
context->conn_handler = NULL;
}
net_context_set_state(context, NET_CONTEXT_UNCONNECTED);
context->flags &= ~NET_CONTEXT_IN_USE;
NET_DBG("Context %p released", context);
k_sem_give(&contexts_lock);
return 0;
}
int net_context_put(struct net_context *context)
{
NET_ASSERT(context);
if (!PART_OF_ARRAY(contexts, context)) {
return -EINVAL;
}
#if defined(CONFIG_NET_OFFLOAD)
if (net_if_is_ip_offloaded(net_context_get_iface(context))) {
k_sem_take(&contexts_lock, K_FOREVER);
context->flags &= ~NET_CONTEXT_IN_USE;
return net_offload_put(
net_context_get_iface(context), context);
}
#endif /* CONFIG_NET_OFFLOAD */
context->connect_cb = NULL;
context->recv_cb = NULL;
context->send_cb = NULL;
#if defined(CONFIG_NET_TCP)
if (net_context_get_ip_proto(context) == IPPROTO_TCP) {
if ((net_context_get_state(context) == NET_CONTEXT_CONNECTED ||
net_context_get_state(context) == NET_CONTEXT_LISTENING)
&& !context->tcp->fin_rcvd) {
NET_DBG("TCP connection in active close, not "
"disposing yet (waiting %dms)", FIN_TIMEOUT);
k_delayed_work_submit(&context->tcp->fin_timer,
FIN_TIMEOUT);
context->tcp->fin_timer_cancelled = false;
queue_fin(context);
return 0;
}
}
#endif /* CONFIG_NET_TCP */
net_context_unref(context);
return 0;
}
/* If local address is not bound, bind it to INADDR_ANY and random port. */
static int bind_default(struct net_context *context)
{
sa_family_t family = net_context_get_family(context);
#if defined(CONFIG_NET_IPV6)
if (family == AF_INET6) {
struct sockaddr_in6 addr6;
if (net_sin6_ptr(&context->local)->sin6_addr) {
return 0;
}
addr6.sin6_family = AF_INET6;
memcpy(&addr6.sin6_addr, net_ipv6_unspecified_address(),
sizeof(addr6.sin6_addr));
addr6.sin6_port =
find_available_port(context,
(struct sockaddr *)&addr6);
return net_context_bind(context, (struct sockaddr *)&addr6,
sizeof(addr6));
}
#endif
#if defined(CONFIG_NET_IPV4)
if (family == AF_INET) {
struct sockaddr_in addr4;
if (net_sin_ptr(&context->local)->sin_addr) {
return 0;
}
addr4.sin_family = AF_INET;
addr4.sin_addr.s_addr = INADDR_ANY;
addr4.sin_port =
find_available_port(context,
(struct sockaddr *)&addr4);
return net_context_bind(context, (struct sockaddr *)&addr4,
sizeof(addr4));
}
#endif
return -EINVAL;
}
int net_context_bind(struct net_context *context, const struct sockaddr *addr,
socklen_t addrlen)
{
NET_ASSERT(addr);
NET_ASSERT(PART_OF_ARRAY(contexts, context));
/* If we already have connection handler, then it effectively
* means that it's already bound to an interface/port, and we
* don't support rebinding connection to new address/port in
* the code below.
* TODO: Support rebinding.
*/
if (context->conn_handler) {
return -EISCONN;
}
#if defined(CONFIG_NET_IPV6)
if (addr->family == AF_INET6) {
struct net_if *iface = NULL;
struct in6_addr *ptr;
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
int ret;
if (addrlen < sizeof(struct sockaddr_in6)) {
return -EINVAL;
}
if (net_is_ipv6_addr_mcast(&addr6->sin6_addr)) {
struct net_if_mcast_addr *maddr;
maddr = net_if_ipv6_maddr_lookup(&addr6->sin6_addr,
&iface);
if (!maddr) {
return -ENOENT;
}
ptr = &maddr->address.in6_addr;
} else if (net_is_ipv6_addr_unspecified(&addr6->sin6_addr)) {
iface = net_if_get_default();
ptr = (struct in6_addr *)net_ipv6_unspecified_address();
} else {
struct net_if_addr *ifaddr;
ifaddr = net_if_ipv6_addr_lookup(&addr6->sin6_addr,
&iface);
if (!ifaddr) {
return -ENOENT;
}
ptr = &ifaddr->address.in6_addr;
}
if (!iface) {
NET_ERR("Cannot bind to %s",
net_sprint_ipv6_addr(&addr6->sin6_addr));
return -EADDRNOTAVAIL;
}
#if defined(CONFIG_NET_OFFLOAD)
if (net_if_is_ip_offloaded(iface)) {
net_context_set_iface(context, iface);
return net_offload_bind(iface,
context,
addr,
addrlen);
}
#endif /* CONFIG_NET_OFFLOAD */
net_context_set_iface(context, iface);
net_sin6_ptr(&context->local)->sin6_family = AF_INET6;
net_sin6_ptr(&context->local)->sin6_addr = ptr;
if (addr6->sin6_port) {
ret = check_used_port(AF_INET6, addr6->sin6_port,
addr);
if (!ret) {
net_sin6_ptr(&context->local)->sin6_port =
addr6->sin6_port;
} else {
NET_ERR("Port %d is in use!",
ntohs(addr6->sin6_port));
return ret;
}
} else {
addr6->sin6_port =
net_sin6_ptr(&context->local)->sin6_port;
}
NET_DBG("Context %p binding to %s [%s]:%d iface %p",
context,
net_proto2str(net_context_get_ip_proto(context)),
net_sprint_ipv6_addr(ptr), ntohs(addr6->sin6_port),
iface);
return 0;
}
#endif
#if defined(CONFIG_NET_IPV4)
if (addr->family == AF_INET) {
struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
struct net_if_addr *ifaddr;
struct net_if *iface;
struct in_addr *ptr;
int ret;
if (addrlen < sizeof(struct sockaddr_in)) {
return -EINVAL;
}
if (addr4->sin_addr.s_addr == INADDR_ANY) {
iface = net_if_get_default();
ptr = (struct in_addr *)net_ipv4_unspecified_address();
} else {
ifaddr = net_if_ipv4_addr_lookup(&addr4->sin_addr,
&iface);
if (!ifaddr) {
return -ENOENT;
}
ptr = &ifaddr->address.in_addr;
}
if (!iface) {
NET_ERR("Cannot bind to %s",
net_sprint_ipv4_addr(&addr4->sin_addr));
return -EADDRNOTAVAIL;
}
#if defined(CONFIG_NET_OFFLOAD)
if (net_if_is_ip_offloaded(iface)) {
net_context_set_iface(context, iface);
return net_offload_bind(iface,
context,
addr,
addrlen);
}
#endif /* CONFIG_NET_OFFLOAD */
net_context_set_iface(context, iface);
net_sin_ptr(&context->local)->sin_family = AF_INET;
net_sin_ptr(&context->local)->sin_addr = ptr;
if (addr4->sin_port) {
ret = check_used_port(AF_INET, addr4->sin_port,
addr);
if (!ret) {
net_sin_ptr(&context->local)->sin_port =
addr4->sin_port;
} else {
NET_ERR("Port %d is in use!",
ntohs(addr4->sin_port));
return ret;
}
} else {
addr4->sin_port =
net_sin_ptr(&context->local)->sin_port;
}
NET_DBG("Context %p binding to %s %s:%d iface %p",
context,
net_proto2str(net_context_get_ip_proto(context)),
net_sprint_ipv4_addr(ptr),
ntohs(addr4->sin_port), iface);
return 0;
}
#endif
return -EINVAL;
}
static inline struct net_context *find_context(void *conn_handler)
{
int i;
for (i = 0; i < NET_MAX_CONTEXT; i++) {
if (!net_context_is_used(&contexts[i])) {
continue;
}
if (contexts[i].conn_handler == conn_handler) {
return &contexts[i];
}
}
return NULL;
}
int net_context_listen(struct net_context *context, int backlog)
{
ARG_UNUSED(backlog);
NET_ASSERT(PART_OF_ARRAY(contexts, context));
if (!net_context_is_used(context)) {
return -EBADF;
}
#if defined(CONFIG_NET_OFFLOAD)
if (net_if_is_ip_offloaded(net_context_get_iface(context))) {
return net_offload_listen(
net_context_get_iface(context), context, backlog);
}
#endif /* CONFIG_NET_OFFLOAD */
#if defined(CONFIG_NET_TCP)
if (net_context_get_ip_proto(context) == IPPROTO_TCP) {
net_tcp_change_state(context->tcp, NET_TCP_LISTEN);
net_context_set_state(context, NET_CONTEXT_LISTENING);
return 0;
}
#endif
return -EOPNOTSUPP;
}
#if defined(CONFIG_NET_TCP)
#if defined(CONFIG_NET_DEBUG_CONTEXT)
#define net_tcp_print_recv_info(str, pkt, port) \
do { \
if (net_context_get_family(context) == AF_INET6) { \
NET_DBG("%s received from %s port %d", str, \
net_sprint_ipv6_addr(&NET_IPV6_HDR(pkt)->src),\
ntohs(port)); \
} else if (net_context_get_family(context) == AF_INET) {\
NET_DBG("%s received from %s port %d", str, \
net_sprint_ipv4_addr(&NET_IPV4_HDR(pkt)->src),\
ntohs(port)); \
} \
} while (0)
#define net_tcp_print_send_info(str, pkt, port) \
do { \
struct net_context *ctx = net_pkt_context(pkt); \
if (net_context_get_family(ctx) == AF_INET6) { \
NET_DBG("%s sent to %s port %d", str, \
net_sprint_ipv6_addr(&NET_IPV6_HDR(pkt)->dst),\
ntohs(port)); \
} else if (net_context_get_family(ctx) == AF_INET) { \
NET_DBG("%s sent to %s port %d", str, \
net_sprint_ipv4_addr(&NET_IPV4_HDR(pkt)->dst),\
ntohs(port)); \
} \
} while (0)
#else
#define net_tcp_print_recv_info(...)
#define net_tcp_print_send_info(...)
#endif /* CONFIG_NET_DEBUG_CONTEXT */
static void print_send_info(struct net_pkt *pkt, const char *msg)
{
if (IS_ENABLED(CONFIG_NET_DEBUG_CONTEXT)) {