/* mbed Microcontroller Library
* Copyright (c) 2017 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LWIPSTACK_H_
#define LWIPSTACK_H_
#include "lwip/tcpip.h"
#include "lwip/tcp.h"
#include "lwip/ip.h"
#include "lwip/api.h"
#include "netif/etharp.h"
#include "lwip/ethip6.h"
#include "netsocket/nsapi_types.h"
#include "netsocket/EMAC.h"
#include "netsocket/OnboardNetworkStack.h"
#include "LWIPMemoryManager.h"
class LWIP : public OnboardNetworkStack, private mbed::NonCopyable<LWIP> {
public:
static LWIP &get_instance();
class Interface : public OnboardNetworkStack::Interface {
public:
/** Connect the interface to the network
*
* Sets up a connection on specified network interface, using DHCP or provided network details. If the @a dhcp is set to
* true all the remaining parameters are ignored.
*
* @param dhcp true if the network details should be acquired using DHCP
* @param ip IP address to be used for the interface as "W:X:Y:Z" or NULL
* @param netmask Net mask to be used for the interface as "W:X:Y:Z" or NULL
* @param gw Gateway address to be used for the interface as "W:X:Y:Z" or NULL
* @param stack Allow manual selection of IPv4 and/or IPv6.
* @param blocking Specify whether bringup blocks for connection completion.
* @return NSAPI_ERROR_OK on success, or error code
*/
virtual nsapi_error_t bringup(bool dhcp, const char *ip,
const char *netmask, const char *gw,
nsapi_ip_stack_t stack = DEFAULT_STACK,
bool blocking = true
);
/** Disconnect interface from the network
*
* After this call the network interface is inactive, to use it again user needs to call @a mbed_ipstack_bringup again.
*
* @return NSAPI_ERROR_OK on success, or error code
*/
virtual nsapi_error_t bringdown();
/** Register callback for status reporting
*
* The specified status callback function will be called on status changes
* on the network. The parameters on the callback are the event type and
* event-type dependent reason parameter.
*
* @param status_cb The callback for status changes
*/
virtual void attach(mbed::Callback<void(nsapi_event_t, intptr_t)> status_cb);
/** Get the connection status
*
* @return The connection status according to ConnectionStatusType
*/
virtual nsapi_connection_status_t get_connection_status() const;
/** Return MAC address of the network interface
*
* @return MAC address as "V:W:X:Y:Z"
*/
virtual char *get_mac_address(char *buf, nsapi_size_t buflen);
/** Copies IP address of the network interface to user supplied buffer
*
* @param emac EMAC HAL implementation for this network interface
* @param buf buffer to which IP address will be copied as "W:X:Y:Z"
* @param buflen size of supplied buffer
* @return Pointer to a buffer, or NULL if the buffer is too small
*/
virtual char *get_ip_address(char *buf, nsapi_size_t buflen);
/** Copies netmask of the network interface to user supplied buffer
*
* @param buf buffer to which netmask will be copied as "W:X:Y:Z"
* @param buflen size of supplied buffer
* @return Pointer to a buffer, or NULL if the buffer is too small
*/
virtual char *get_netmask(char *buf, nsapi_size_t buflen);
/** Copies gateway address of the network interface to user supplied buffer
*
* @param buf buffer to which gateway address will be copied as "W:X:Y:Z"
* @param buflen size of supplied buffer
* @return Pointer to a buffer, or NULL if the buffer is too small
*/
virtual char *get_gateway(char *buf, nsapi_size_t buflen);
private:
friend LWIP;
Interface();
nsapi_error_t set_dhcp();
static void netif_link_irq(struct netif *netif);
static void netif_status_irq(struct netif *netif);
static Interface *our_if_from_netif(struct netif *netif);
#if LWIP_ETHERNET
static err_t emac_low_level_output(struct netif *netif, struct pbuf *p);
void emac_input(emac_mem_buf_t *buf);
void emac_state_change(bool up);
#if LWIP_IGMP
static err_t emac_igmp_mac_filter(struct netif *netif, const ip4_addr_t *group, enum netif_mac_filter_action action);
#endif
#if LWIP_IPV6_MLD
static err_t emac_mld_mac_filter(struct netif *netif, const ip6_addr_t *group, enum netif_mac_filter_action action);
#endif
static err_t emac_if_init(struct netif *netif);
#endif
union {
#if LWIP_ETHERNET
EMAC *emac; /**< HW specific emac implementation */
#endif
void *hw; /**< alternative implementation pointer - used for PPP */
};
os_semaphore_t linked_sem;
osSemaphoreId_t linked;
os_semaphore_t unlinked_sem;
osSemaphoreId_t unlinked;
os_semaphore_t has_any_addr_sem;
osSemaphoreId_t has_any_addr;
#define HAS_ANY_ADDR 1
#if PREF_ADDR_TIMEOUT
os_semaphore_t has_pref_addr_sem;
osSemaphoreId_t has_pref_addr;
#define HAS_PREF_ADDR 2
#endif
#if BOTH_ADDR_TIMEOUT
os_semaphore_t has_both_addr_sem;
osSemaphoreId_t has_both_addr;
#define HAS_BOTH_ADDR 4
#endif
char has_addr_state;
nsapi_connection_status_t connected;
bool dhcp_started;
bool dhcp_has_to_be_set;
bool blocking;
bool ppp;
mbed::Callback<void(nsapi_event_t, intptr_t)> client_callback;
struct netif netif;
static Interface *list;
Interface *next;
LWIPMemoryManager *memory_manager;
};
/** Register a network interface with the IP stack
*
* Connects EMAC layer with the IP stack and initializes all the required infrastructure.
* This function should be called only once for each available interface.
*
* @param emac EMAC HAL implementation for this network interface
* @param default_if true if the interface should be treated as the default one
* @param[out] interface_out pointer to stack interface object controlling the EMAC
* @return NSAPI_ERROR_OK on success, or error code
*/
virtual nsapi_error_t add_ethernet_interface(EMAC &emac, bool default_if, OnboardNetworkStack::Interface **interface_out);
/** Register a PPP interface with the IP stack
*
* Connects PPP layer with the IP stack and initializes all the required infrastructure.
* This function should be called only once for each available interface.
*
* This is an internal function that links ppp_lwip.cpp to mbed_ipstack_lwip.cpp,
* once a driver starts it via the nsapi_ppp.h API.
*
* Ultimately the nsapi_ppp.h API will be deprecated, and there will be a
* mbed_ipstack_add_ppp_interface() replacing nsapi_ppp_connect().
*
* @param pcb PPP implementation specific user data; will be passed to PPP callbacks
* @param default_if true if the interface should be treated as the default one
* @param stack Allow manual selection of IPv4 and/or IPv6
* @param[out] interface_out set to interface handle that must be passed to subsequent mbed_stack calls
* @return NSAPI_ERROR_OK on success, or error code
*/
nsapi_error_t _add_ppp_interface(void *pcb, bool default_if, nsapi_ip_stack_t stack, LWIP::Interface **interface_out);
/** Get a domain name server from a list of servers to query
*
* Returns a DNS server address for a index. If returns error no more
* DNS servers to read.
*
* @param index Index of the DNS server, starts from zero
* @param address Destination for the host address
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t get_dns_server(int index, SocketAddress *address);
/** Get the local IP address
*
* @return Null-terminated representation of the local IP address
* or null if not yet connected
*/
virtual const char *get_ip_address();
protected:
LWIP();
virtual ~LWIP() {}
/** Opens a socket
*
* Creates a network socket and stores it in the specified handle.
* The handle must be passed to following calls on the socket.
*
* A stack may have a finite number of sockets, in this case
* NSAPI_ERROR_NO_SOCKET is returned if no socket is available.
*
* @param handle Destination for the handle to a newly created socket
* @param proto Protocol of socket to open, NSAPI_TCP or NSAPI_UDP
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t socket_open(nsapi_socket_t *handle, nsapi_protocol_t proto);
/** Close the socket
*
* Closes any open connection and deallocates any memory associated
* with the socket.
*
* @param handle Socket handle
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t socket_close(nsapi_socket_t handle);
/** Bind a specific address to a socket
*
* Binding a socket specifies the address and port on which to recieve
* data. If the IP address is zeroed, only the port is bound.
*
* @param handle Socket handle
* @param address Local address to bind
* @return 0 on success, negative error code on failure.
*/
virtual nsapi_error_t socket_bind(nsapi_socket_t handle, const SocketAddress &address);
/** Listen for connections on a TCP socket
*
* Marks the socket as a passive socket that can be used to accept
* incoming connections.
*
* @param handle Socket handle
* @param backlog Number of pending connections that can be queued
* simultaneously
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t socket_listen(nsapi_socket_t handle, int backlog);
/** Connects TCP socket to a remote host
*
* Initiates a connection to a remote server specified by the
* indicated address.
*
* @param handle Socket handle
* @param address The SocketAddress of the remote host
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t socket_connect(nsapi_socket_t handle, const SocketAddress &address);
/** Accepts a connection on a TCP socket
*
* The server socket must be bound and set to listen for connections.
* On a new connection, creates a network socket and stores it in the
* specified handle. The handle must be passed to following calls on
* the socket.
*
* A stack may have a finite number of sockets, in this case
* NSAPI_ERROR_NO_SOCKET is returned if no socket is available.
*
* This call is non-blocking. If accept would block,
* NSAPI_ERROR_WOULD_BLOCK is returned immediately.
*
* @param server Socket handle to server to accept from
* @param handle Destination for a handle to the newly created socket
* @param address Destination for the remote address or NULL
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t socket_accept(nsapi_socket_t server,
nsapi_socket_t *handle, SocketAddress *address=0);
/** Send data over a TCP socket
*
* The socket must be connected to a remote host. Returns the number of
* bytes sent from the buffer.
*
* This call is non-blocking. If send would block,
* NSAPI_ERROR_WOULD_BLOCK is returned immediately.
*
* @param handle Socket handle
* @param data Buffer of data to send to the host
* @param size Size of the buffer in bytes
* @return Number of sent bytes on success, negative error
* code on failure
*/
virtual nsapi_size_or_error_t socket_send(nsapi_socket_t handle,
const void *data, nsapi_size_t size);
/** Receive data over a TCP socket
*
* The socket must be connected to a remote host. Returns the number of
* bytes received into the buffer.
*
* This call is non-blocking. If recv would block,
* NSAPI_ERROR_WOULD_BLOCK is returned immediately.
*
* @param handle Socket handle
* @param data Destination buffer for data received from the host
* @param size Size of the buffer in bytes
* @return Number of received bytes on success, negative error
* code on failure
*/
virtual nsapi_size_or_error_t socket_recv(nsapi_socket_t handle,
void *data, nsapi_size_t size);
/** Send a packet over a UDP socket
*
* Sends data to the specified address. Returns the number of bytes
* sent from the buffer.
*
* This call is non-blocking. If sendto would block,
* NSAPI_ERROR_WOULD_BLOCK is returned immediately.
*
* @param handle Socket handle
* @param address The SocketAddress of the remote host
* @param data Buffer of data to send to the host
* @param size Size of the buffer in bytes
* @return Number of sent bytes on success, negative error
* code on failure
*/
virtual nsapi_size_or_error_t socket_sendto(nsapi_socket_t handle, const SocketAddress &address,
const void *data, nsapi_size_t size);
/** Receive a packet over a UDP socket
*
* Receives data and stores the source address in address if address
* is not NULL. Returns the number of bytes received into the buffer.
*
* This call is non-blocking. If recvfrom would block,
* NSAPI_ERROR_WOULD_BLOCK is returned immediately.
*
* @param handle Socket handle
* @param address Destination for the source address or NULL
* @param buffer Destination buffer for data received from the host
* @param size Size of the buffer in bytes
* @return Number of received bytes on success, negative error
* code on failure
*/
virtual nsapi_size_or_error_t socket_recvfrom(nsapi_socket_t handle, SocketAddress *address,
void *buffer, nsapi_size_t size);
/** Register a callback on state change of the socket
*
* The specified callback will be called on state changes such as when
* the socket can recv/send/accept successfully and on when an error
* occurs. The callback may also be called spuriously without reason.
*
* The callback may be called in an interrupt context and should not
* perform expensive operations such as recv/send calls.
*
* @param handle Socket handle
* @param callback Function to call on state change
* @param data Argument to pass to callback
*/
virtual void socket_attach(nsapi_socket_t handle, void (*callback)(void *), void *data);
/* Set stack-specific socket options
*
* The setsockopt allow an application to pass stack-specific hints
* to the underlying stack. For unsupported options,
* NSAPI_ERROR_UNSUPPORTED is returned and the socket is unmodified.
*
* @param handle Socket handle
* @param level Stack-specific protocol level
* @param optname Stack-specific option identifier
* @param optval Option value
* @param optlen Length of the option value
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t setsockopt(nsapi_socket_t handle, int level,
int optname, const void *optval, unsigned optlen);
/* Get stack-specific socket options
*
* The getstackopt allow an application to retrieve stack-specific hints
* from the underlying stack. For unsupported options,
* NSAPI_ERROR_UNSUPPORTED is returned and optval is unmodified.
*
* @param handle Socket handle
* @param level Stack-specific protocol level
* @param optname Stack-specific option identifier
* @param optval Destination for option value
* @param optlen Length of the option value
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t getsockopt(nsapi_socket_t handle, int level,
int optname, void *optval, unsigned *optlen);
private:
/** Call in callback
*
* Callback is used to call the call in method of the network stack.
*/
typedef mbed::Callback<nsapi_error_t (int delay_ms, mbed::Callback<void()> user_cb)> call_in_callback_cb_t;
/** Get a call in callback
*
* Get a call in callback from the network stack context.
*
* Callback should not take more than 10ms to execute, otherwise it might
* prevent underlying thread processing. A portable user of the callback
* should not make calls to network operations due to stack size limitations.
* The callback should not perform expensive operations such as socket recv/send
* calls or blocking operations.
*
* @return Call in callback
*/
virtual call_in_callback_cb_t get_call_in_callback();
/** Call a callback after a delay
*
* Call a callback from the network stack context after a delay. If function
* returns error callback will not be called.
*
* @param delay Delay in milliseconds
* @param func Callback to be called
* @return 0 on success, negative error code on failure
*/
nsapi_error_t call_in(int delay, mbed::Callback<void()> func);
struct mbed_lwip_socket {
bool in_use;
struct netconn *conn;
struct netbuf *buf;
u16_t offset;
void (*cb)(void *);
void *data;
// Track multicast addresses subscribed to by this socket
nsapi_ip_mreq_t *multicast_memberships;
uint32_t multicast_memberships_count;
uint32_t multicast_memberships_registry;
};
struct lwip_callback {
unsigned int delay;
mbed::Callback<void()> callback;
};
static nsapi_error_t err_remap(err_t err);
static bool is_local_addr(const ip_addr_t *ip_addr);
static const ip_addr_t *get_ip_addr(bool any_addr, const struct netif *netif);
static const ip_addr_t *get_ipv4_addr(const struct netif *netif);
static const ip_addr_t *get_ipv6_addr(const struct netif *netif);
static void add_dns_addr(struct netif *lwip_netif);
/* Static arena of sockets */
struct mbed_lwip_socket arena[MEMP_NUM_NETCONN];
void arena_init(void);
struct mbed_lwip_socket *arena_alloc();
void arena_dealloc(struct mbed_lwip_socket *s);
static uint32_t next_registered_multicast_member(const struct mbed_lwip_socket *s, uint32_t index) {
while (!(s->multicast_memberships_registry & (0x0001 << index))) { index++; }
return index;
}
static uint32_t next_free_multicast_member(const struct mbed_lwip_socket *s, uint32_t index) {
while ((s->multicast_memberships_registry & (0x0001 << index))) { index++; }
return index;
}
static void set_multicast_member_registry_bit(struct mbed_lwip_socket *s, uint32_t index) {
s->multicast_memberships_registry |= (0x0001 << index);
}
static void clear_multicast_member_registry_bit(struct mbed_lwip_socket *s, uint32_t index) {
s->multicast_memberships_registry &= ~(0x0001 << index);
}
static int32_t find_multicast_member(const struct mbed_lwip_socket *s, const nsapi_ip_mreq_t *imr);
static void socket_callback(struct netconn *nc, enum netconn_evt eh, u16_t len);
static void tcpip_init_irq(void *handle);
static void tcpip_thread_callback(void *ptr);
char ip_address[40];
rtos::Semaphore tcpip_inited;
Interface *default_interface;
LWIPMemoryManager memory_manager;
osThreadId tcpip_thread_id;
rtos::Mutex adaptation;
};
#endif /* LWIPSTACK_H_ */
