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modlwip.c
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modlwip.c
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2019 Damien P. George
* Copyright (c) 2015 Galen Hazelwood
* Copyright (c) 2015-2017 Paul Sokolovsky
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include <stdio.h>
#include "py/objlist.h"
#include "py/runtime.h"
#include "py/stream.h"
#include "py/mperrno.h"
#include "py/mphal.h"
#if MICROPY_PY_LWIP
#include "shared/netutils/netutils.h"
#include "lwip/init.h"
#include "lwip/tcp.h"
#include "lwip/udp.h"
#include "lwip/raw.h"
#include "lwip/dns.h"
#include "lwip/igmp.h"
#if LWIP_VERSION_MAJOR < 2
#include "lwip/timers.h"
#include "lwip/tcp_impl.h"
#else
#include "lwip/timeouts.h"
#include "lwip/priv/tcp_priv.h"
#endif
#if 0 // print debugging info
#define DEBUG_printf DEBUG_printf
#else // don't print debugging info
#define DEBUG_printf(...) (void)0
#endif
// Timeout between closing a TCP socket and doing a tcp_abort on that
// socket, if the connection isn't closed cleanly in that time.
#define MICROPY_PY_LWIP_TCP_CLOSE_TIMEOUT_MS (10000)
// All socket options should be globally distinct,
// because we ignore option levels for efficiency.
#define IP_ADD_MEMBERSHIP 0x400
#define IP_DROP_MEMBERSHIP 0x401
// For compatibilily with older lwIP versions.
#ifndef ip_set_option
#define ip_set_option(pcb, opt) ((pcb)->so_options |= (opt))
#endif
#ifndef ip_reset_option
#define ip_reset_option(pcb, opt) ((pcb)->so_options &= ~(opt))
#endif
// A port can define these hooks to provide concurrency protection
#ifndef MICROPY_PY_LWIP_ENTER
#define MICROPY_PY_LWIP_ENTER
#define MICROPY_PY_LWIP_REENTER
#define MICROPY_PY_LWIP_EXIT
#endif
#ifdef MICROPY_PY_LWIP_SLIP
#include "netif/slipif.h"
#include "lwip/sio.h"
#endif
#ifdef MICROPY_PY_LWIP_SLIP
/******************************************************************************/
// Slip object for modlwip. Requires a serial driver for the port that supports
// the lwip serial callback functions.
typedef struct _lwip_slip_obj_t {
mp_obj_base_t base;
struct netif lwip_netif;
} lwip_slip_obj_t;
// Slip object is unique for now. Possibly can fix this later. FIXME
STATIC lwip_slip_obj_t lwip_slip_obj;
// Declare these early.
void mod_lwip_register_poll(void (*poll)(void *arg), void *poll_arg);
void mod_lwip_deregister_poll(void (*poll)(void *arg), void *poll_arg);
STATIC void slip_lwip_poll(void *netif) {
slipif_poll((struct netif *)netif);
}
STATIC const mp_obj_type_t lwip_slip_type;
// lwIP SLIP callback functions
sio_fd_t sio_open(u8_t dvnum) {
// We support singleton SLIP interface, so just return any truish value.
return (sio_fd_t)1;
}
void sio_send(u8_t c, sio_fd_t fd) {
mp_obj_type_t *type = mp_obj_get_type(MP_STATE_VM(lwip_slip_stream));
int error;
type->stream_p->write(MP_STATE_VM(lwip_slip_stream), &c, 1, &error);
}
u32_t sio_tryread(sio_fd_t fd, u8_t *data, u32_t len) {
mp_obj_type_t *type = mp_obj_get_type(MP_STATE_VM(lwip_slip_stream));
int error;
mp_uint_t out_sz = type->stream_p->read(MP_STATE_VM(lwip_slip_stream), data, len, &error);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(error)) {
return 0;
}
// Can't do much else, can we?
return 0;
}
return out_sz;
}
// constructor lwip.slip(device=integer, iplocal=string, ipremote=string)
STATIC mp_obj_t lwip_slip_make_new(mp_obj_t type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 3, 3, false);
lwip_slip_obj.base.type = &lwip_slip_type;
MP_STATE_VM(lwip_slip_stream) = args[0];
ip_addr_t iplocal, ipremote;
if (!ipaddr_aton(mp_obj_str_get_str(args[1]), &iplocal)) {
mp_raise_ValueError(MP_ERROR_TEXT("not a valid local IP"));
}
if (!ipaddr_aton(mp_obj_str_get_str(args[2]), &ipremote)) {
mp_raise_ValueError(MP_ERROR_TEXT("not a valid remote IP"));
}
struct netif *n = &lwip_slip_obj.lwip_netif;
if (netif_add(n, &iplocal, IP_ADDR_BROADCAST, &ipremote, NULL, slipif_init, ip_input) == NULL) {
mp_raise_ValueError(MP_ERROR_TEXT("out of memory"));
}
netif_set_up(n);
netif_set_default(n);
mod_lwip_register_poll(slip_lwip_poll, n);
return (mp_obj_t)&lwip_slip_obj;
}
STATIC mp_obj_t lwip_slip_status(mp_obj_t self_in) {
// Null function for now.
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(lwip_slip_status_obj, lwip_slip_status);
STATIC const mp_rom_map_elem_t lwip_slip_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_status), MP_ROM_PTR(&lwip_slip_status_obj) },
};
STATIC MP_DEFINE_CONST_DICT(lwip_slip_locals_dict, lwip_slip_locals_dict_table);
STATIC MP_DEFINE_CONST_OBJ_TYPE(
lwip_slip_type,
MP_QSTR_slip,
MP_TYPE_FLAG_NONE,
make_new, lwip_slip_make_new,
locals_dict, &lwip_slip_locals_dict
);
#endif // MICROPY_PY_LWIP_SLIP
/******************************************************************************/
// Table to convert lwIP err_t codes to socket errno codes, from the lwIP
// socket API.
// lwIP 2 changed LWIP_VERSION and it can no longer be used in macros,
// so we define our own equivalent version that can.
#define LWIP_VERSION_MACRO (LWIP_VERSION_MAJOR << 24 | LWIP_VERSION_MINOR << 16 \
| LWIP_VERSION_REVISION << 8 | LWIP_VERSION_RC)
// Extension to lwIP error codes
#define _ERR_BADF -16
// TODO: We just know that change happened somewhere between 1.4.0 and 1.4.1,
// investigate in more detail.
#if LWIP_VERSION_MACRO < 0x01040100
static const int error_lookup_table[] = {
0, /* ERR_OK 0 No error, everything OK. */
MP_ENOMEM, /* ERR_MEM -1 Out of memory error. */
MP_ENOBUFS, /* ERR_BUF -2 Buffer error. */
MP_EWOULDBLOCK, /* ERR_TIMEOUT -3 Timeout */
MP_EHOSTUNREACH, /* ERR_RTE -4 Routing problem. */
MP_EINPROGRESS, /* ERR_INPROGRESS -5 Operation in progress */
MP_EINVAL, /* ERR_VAL -6 Illegal value. */
MP_EWOULDBLOCK, /* ERR_WOULDBLOCK -7 Operation would block. */
MP_ECONNABORTED, /* ERR_ABRT -8 Connection aborted. */
MP_ECONNRESET, /* ERR_RST -9 Connection reset. */
MP_ENOTCONN, /* ERR_CLSD -10 Connection closed. */
MP_ENOTCONN, /* ERR_CONN -11 Not connected. */
MP_EIO, /* ERR_ARG -12 Illegal argument. */
MP_EADDRINUSE, /* ERR_USE -13 Address in use. */
-1, /* ERR_IF -14 Low-level netif error */
MP_EALREADY, /* ERR_ISCONN -15 Already connected. */
MP_EBADF, /* _ERR_BADF -16 Closed socket (null pcb) */
};
#elif LWIP_VERSION_MACRO < 0x02000000
static const int error_lookup_table[] = {
0, /* ERR_OK 0 No error, everything OK. */
MP_ENOMEM, /* ERR_MEM -1 Out of memory error. */
MP_ENOBUFS, /* ERR_BUF -2 Buffer error. */
MP_EWOULDBLOCK, /* ERR_TIMEOUT -3 Timeout */
MP_EHOSTUNREACH, /* ERR_RTE -4 Routing problem. */
MP_EINPROGRESS, /* ERR_INPROGRESS -5 Operation in progress */
MP_EINVAL, /* ERR_VAL -6 Illegal value. */
MP_EWOULDBLOCK, /* ERR_WOULDBLOCK -7 Operation would block. */
MP_EADDRINUSE, /* ERR_USE -8 Address in use. */
MP_EALREADY, /* ERR_ISCONN -9 Already connected. */
MP_ECONNABORTED, /* ERR_ABRT -10 Connection aborted. */
MP_ECONNRESET, /* ERR_RST -11 Connection reset. */
MP_ENOTCONN, /* ERR_CLSD -12 Connection closed. */
MP_ENOTCONN, /* ERR_CONN -13 Not connected. */
MP_EIO, /* ERR_ARG -14 Illegal argument. */
-1, /* ERR_IF -15 Low-level netif error */
MP_EBADF, /* _ERR_BADF -16 Closed socket (null pcb) */
};
#else
// Matches lwIP 2.0.3
#undef _ERR_BADF
#define _ERR_BADF -17
static const int error_lookup_table[] = {
0, /* ERR_OK 0 No error, everything OK */
MP_ENOMEM, /* ERR_MEM -1 Out of memory error */
MP_ENOBUFS, /* ERR_BUF -2 Buffer error */
MP_EWOULDBLOCK, /* ERR_TIMEOUT -3 Timeout */
MP_EHOSTUNREACH, /* ERR_RTE -4 Routing problem */
MP_EINPROGRESS, /* ERR_INPROGRESS -5 Operation in progress */
MP_EINVAL, /* ERR_VAL -6 Illegal value */
MP_EWOULDBLOCK, /* ERR_WOULDBLOCK -7 Operation would block */
MP_EADDRINUSE, /* ERR_USE -8 Address in use */
MP_EALREADY, /* ERR_ALREADY -9 Already connecting */
MP_EALREADY, /* ERR_ISCONN -10 Conn already established */
MP_ENOTCONN, /* ERR_CONN -11 Not connected */
-1, /* ERR_IF -12 Low-level netif error */
MP_ECONNABORTED, /* ERR_ABRT -13 Connection aborted */
MP_ECONNRESET, /* ERR_RST -14 Connection reset */
MP_ENOTCONN, /* ERR_CLSD -15 Connection closed */
MP_EIO, /* ERR_ARG -16 Illegal argument. */
MP_EBADF, /* _ERR_BADF -17 Closed socket (null pcb) */
};
#endif
/*******************************************************************************/
// The socket object provided by lwip.socket.
#define MOD_NETWORK_AF_INET (2)
#define MOD_NETWORK_AF_INET6 (10)
#define MOD_NETWORK_SOCK_STREAM (1)
#define MOD_NETWORK_SOCK_DGRAM (2)
#define MOD_NETWORK_SOCK_RAW (3)
typedef struct _lwip_socket_obj_t {
mp_obj_base_t base;
volatile union {
struct tcp_pcb *tcp;
struct udp_pcb *udp;
struct raw_pcb *raw;
} pcb;
volatile union {
struct pbuf *pbuf;
struct {
uint8_t alloc;
uint8_t iget;
uint8_t iput;
union {
struct tcp_pcb *item; // if alloc == 0
struct tcp_pcb **array; // if alloc != 0
} tcp;
} connection;
} incoming;
mp_obj_t callback;
byte peer[4];
mp_uint_t peer_port;
mp_uint_t timeout;
uint16_t recv_offset;
uint8_t domain;
uint8_t type;
#define STATE_NEW 0
#define STATE_LISTENING 1
#define STATE_CONNECTING 2
#define STATE_CONNECTED 3
#define STATE_PEER_CLOSED 4
#define STATE_ACTIVE_UDP 5
// Negative value is lwIP error
int8_t state;
} lwip_socket_obj_t;
static inline void poll_sockets(void) {
#ifdef MICROPY_EVENT_POLL_HOOK
MICROPY_EVENT_POLL_HOOK;
#else
mp_hal_delay_ms(1);
#endif
}
STATIC struct tcp_pcb *volatile *lwip_socket_incoming_array(lwip_socket_obj_t *socket) {
if (socket->incoming.connection.alloc == 0) {
return &socket->incoming.connection.tcp.item;
} else {
return &socket->incoming.connection.tcp.array[0];
}
}
STATIC void lwip_socket_free_incoming(lwip_socket_obj_t *socket) {
bool socket_is_listener =
socket->type == MOD_NETWORK_SOCK_STREAM
&& socket->pcb.tcp->state == LISTEN;
if (!socket_is_listener) {
if (socket->incoming.pbuf != NULL) {
pbuf_free(socket->incoming.pbuf);
socket->incoming.pbuf = NULL;
}
} else {
uint8_t alloc = socket->incoming.connection.alloc;
struct tcp_pcb *volatile *tcp_array = lwip_socket_incoming_array(socket);
for (uint8_t i = 0; i < alloc; ++i) {
// Deregister callback and abort
if (tcp_array[i] != NULL) {
tcp_poll(tcp_array[i], NULL, 0);
tcp_abort(tcp_array[i]);
tcp_array[i] = NULL;
}
}
}
}
/*******************************************************************************/
// Callback functions for the lwIP raw API.
static inline void exec_user_callback(lwip_socket_obj_t *socket) {
if (socket->callback != MP_OBJ_NULL) {
// Schedule the user callback to execute outside the lwIP context
mp_sched_schedule(socket->callback, MP_OBJ_FROM_PTR(socket));
}
}
#if MICROPY_PY_LWIP_SOCK_RAW
// Callback for incoming raw packets.
#if LWIP_VERSION_MAJOR < 2
STATIC u8_t _lwip_raw_incoming(void *arg, struct raw_pcb *pcb, struct pbuf *p, ip_addr_t *addr)
#else
STATIC u8_t _lwip_raw_incoming(void *arg, struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *addr)
#endif
{
lwip_socket_obj_t *socket = (lwip_socket_obj_t *)arg;
if (socket->incoming.pbuf != NULL) {
pbuf_free(p);
} else {
socket->incoming.pbuf = p;
memcpy(&socket->peer, addr, sizeof(socket->peer));
}
return 1; // we ate the packet
}
#endif
// Callback for incoming UDP packets. We simply stash the packet and the source address,
// in case we need it for recvfrom.
#if LWIP_VERSION_MAJOR < 2
STATIC void _lwip_udp_incoming(void *arg, struct udp_pcb *upcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
#else
STATIC void _lwip_udp_incoming(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
#endif
{
lwip_socket_obj_t *socket = (lwip_socket_obj_t *)arg;
if (socket->incoming.pbuf != NULL) {
// That's why they call it "unreliable". No room in the inn, drop the packet.
pbuf_free(p);
} else {
socket->incoming.pbuf = p;
socket->peer_port = (mp_uint_t)port;
memcpy(&socket->peer, addr, sizeof(socket->peer));
}
}
// Callback for general tcp errors.
STATIC void _lwip_tcp_error(void *arg, err_t err) {
lwip_socket_obj_t *socket = (lwip_socket_obj_t *)arg;
// Free any incoming buffers or connections that are stored
lwip_socket_free_incoming(socket);
// Pass the error code back via the connection variable.
socket->state = err;
// If we got here, the lwIP stack either has deallocated or will deallocate the pcb.
socket->pcb.tcp = NULL;
}
// Callback for tcp connection requests. Error code err is unused. (See tcp.h)
STATIC err_t _lwip_tcp_connected(void *arg, struct tcp_pcb *tpcb, err_t err) {
lwip_socket_obj_t *socket = (lwip_socket_obj_t *)arg;
socket->state = STATE_CONNECTED;
return ERR_OK;
}
// Handle errors (eg connection aborted) on TCP PCBs that have been put on the
// accept queue but are not yet actually accepted.
STATIC void _lwip_tcp_err_unaccepted(void *arg, err_t err) {
struct tcp_pcb *pcb = (struct tcp_pcb *)arg;
// The ->connected entry is repurposed to store the parent socket; this is safe
// because it's only ever used by lwIP if tcp_connect is called on the TCP PCB.
lwip_socket_obj_t *socket = (lwip_socket_obj_t *)pcb->connected;
// Array is not volatile because thiss callback is executed within the lwIP context
uint8_t alloc = socket->incoming.connection.alloc;
struct tcp_pcb **tcp_array = (struct tcp_pcb **)lwip_socket_incoming_array(socket);
// Search for PCB on the accept queue of the parent socket
struct tcp_pcb **shift_down = NULL;
uint8_t i = socket->incoming.connection.iget;
do {
if (shift_down == NULL) {
if (tcp_array[i] == pcb) {
shift_down = &tcp_array[i];
}
} else {
*shift_down = tcp_array[i];
shift_down = &tcp_array[i];
}
if (++i >= alloc) {
i = 0;
}
} while (i != socket->incoming.connection.iput);
// PCB found in queue, remove it
if (shift_down != NULL) {
*shift_down = NULL;
socket->incoming.connection.iput = shift_down - tcp_array;
}
}
// By default, a child socket of listen socket is created with recv
// handler which discards incoming pbuf's. We don't want to do that,
// so set this handler which requests lwIP to keep pbuf's and deliver
// them later. We cannot cache pbufs in child socket on Python side,
// until it is created in accept().
STATIC err_t _lwip_tcp_recv_unaccepted(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) {
return ERR_BUF;
}
// Callback for incoming tcp connections.
STATIC err_t _lwip_tcp_accept(void *arg, struct tcp_pcb *newpcb, err_t err) {
// err can be ERR_MEM to notify us that there was no memory for an incoming connection
if (err != ERR_OK) {
return ERR_OK;
}
lwip_socket_obj_t *socket = (lwip_socket_obj_t *)arg;
tcp_recv(newpcb, _lwip_tcp_recv_unaccepted);
// Search for an empty slot to store the new connection
struct tcp_pcb *volatile *slot = &lwip_socket_incoming_array(socket)[socket->incoming.connection.iput];
if (*slot == NULL) {
// Have an empty slot to store waiting connection
*slot = newpcb;
if (++socket->incoming.connection.iput >= socket->incoming.connection.alloc) {
socket->incoming.connection.iput = 0;
}
// Schedule user accept callback
exec_user_callback(socket);
// Set the error callback to handle the case of a dropped connection before we
// have a chance to take it off the accept queue.
// The ->connected entry is repurposed to store the parent socket; this is safe
// because it's only ever used by lwIP if tcp_connect is called on the TCP PCB.
newpcb->connected = (void *)socket;
tcp_arg(newpcb, newpcb);
tcp_err(newpcb, _lwip_tcp_err_unaccepted);
return ERR_OK;
}
DEBUG_printf("_lwip_tcp_accept: No room to queue pcb waiting for accept\n");
return ERR_BUF;
}
// Callback for inbound tcp packets.
STATIC err_t _lwip_tcp_recv(void *arg, struct tcp_pcb *tcpb, struct pbuf *p, err_t err) {
lwip_socket_obj_t *socket = (lwip_socket_obj_t *)arg;
if (p == NULL) {
// Other side has closed connection.
DEBUG_printf("_lwip_tcp_recv[%p]: other side closed connection\n", socket);
socket->state = STATE_PEER_CLOSED;
exec_user_callback(socket);
return ERR_OK;
}
if (socket->incoming.pbuf == NULL) {
socket->incoming.pbuf = p;
} else {
#ifdef SOCKET_SINGLE_PBUF
return ERR_BUF;
#else
pbuf_cat(socket->incoming.pbuf, p);
#endif
}
exec_user_callback(socket);
return ERR_OK;
}
/*******************************************************************************/
// Functions for socket send/receive operations. Socket send/recv and friends call
// these to do the work.
// Helper function for send/sendto to handle raw/UDP packets.
STATIC mp_uint_t lwip_raw_udp_send(lwip_socket_obj_t *socket, const byte *buf, mp_uint_t len, byte *ip, mp_uint_t port, int *_errno) {
if (len > 0xffff) {
// Any packet that big is probably going to fail the pbuf_alloc anyway, but may as well try
len = 0xffff;
}
MICROPY_PY_LWIP_ENTER
// FIXME: maybe PBUF_ROM?
struct pbuf *p = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM);
if (p == NULL) {
MICROPY_PY_LWIP_EXIT
*_errno = MP_ENOMEM;
return -1;
}
memcpy(p->payload, buf, len);
err_t err;
if (ip == NULL) {
#if MICROPY_PY_LWIP_SOCK_RAW
if (socket->type == MOD_NETWORK_SOCK_RAW) {
err = raw_send(socket->pcb.raw, p);
} else
#endif
{
err = udp_send(socket->pcb.udp, p);
}
} else {
ip_addr_t dest;
IP4_ADDR(&dest, ip[0], ip[1], ip[2], ip[3]);
#if MICROPY_PY_LWIP_SOCK_RAW
if (socket->type == MOD_NETWORK_SOCK_RAW) {
err = raw_sendto(socket->pcb.raw, p, &dest);
} else
#endif
{
err = udp_sendto(socket->pcb.udp, p, &dest, port);
}
}
pbuf_free(p);
MICROPY_PY_LWIP_EXIT
// udp_sendto can return 1 on occasion for ESP8266 port. It's not known why
// but it seems that the send actually goes through without error in this case.
// So we treat such cases as a success until further investigation.
if (err != ERR_OK && err != 1) {
*_errno = error_lookup_table[-err];
return -1;
}
return len;
}
// Helper function for recv/recvfrom to handle raw/UDP packets
STATIC mp_uint_t lwip_raw_udp_receive(lwip_socket_obj_t *socket, byte *buf, mp_uint_t len, byte *ip, mp_uint_t *port, int *_errno) {
if (socket->incoming.pbuf == NULL) {
if (socket->timeout == 0) {
// Non-blocking socket.
*_errno = MP_EAGAIN;
return -1;
}
// Wait for data to arrive on UDP socket.
mp_uint_t start = mp_hal_ticks_ms();
while (socket->incoming.pbuf == NULL) {
if (socket->timeout != -1 && mp_hal_ticks_ms() - start > socket->timeout) {
*_errno = MP_ETIMEDOUT;
return -1;
}
poll_sockets();
}
}
if (ip != NULL) {
memcpy(ip, &socket->peer, sizeof(socket->peer));
*port = socket->peer_port;
}
struct pbuf *p = socket->incoming.pbuf;
MICROPY_PY_LWIP_ENTER
u16_t result = pbuf_copy_partial(p, buf, ((p->tot_len > len) ? len : p->tot_len), 0);
pbuf_free(p);
socket->incoming.pbuf = NULL;
MICROPY_PY_LWIP_EXIT
return (mp_uint_t)result;
}
// For use in stream virtual methods
#define STREAM_ERROR_CHECK(socket) \
if (socket->state < 0) { \
*_errno = error_lookup_table[-socket->state]; \
return MP_STREAM_ERROR; \
} \
assert(socket->pcb.tcp);
// Version of above for use when lock is held
#define STREAM_ERROR_CHECK_WITH_LOCK(socket) \
if (socket->state < 0) { \
*_errno = error_lookup_table[-socket->state]; \
MICROPY_PY_LWIP_EXIT \
return MP_STREAM_ERROR; \
} \
assert(socket->pcb.tcp);
// Helper function for send/sendto to handle TCP packets
STATIC mp_uint_t lwip_tcp_send(lwip_socket_obj_t *socket, const byte *buf, mp_uint_t len, int *_errno) {
// Check for any pending errors
STREAM_ERROR_CHECK(socket);
MICROPY_PY_LWIP_ENTER
u16_t available = tcp_sndbuf(socket->pcb.tcp);
if (available == 0) {
// Non-blocking socket
if (socket->timeout == 0) {
MICROPY_PY_LWIP_EXIT
*_errno = MP_EAGAIN;
return MP_STREAM_ERROR;
}
mp_uint_t start = mp_hal_ticks_ms();
// Assume that STATE_PEER_CLOSED may mean half-closed connection, where peer closed it
// sending direction, but not receiving. Consequently, check for both STATE_CONNECTED
// and STATE_PEER_CLOSED as normal conditions and still waiting for buffers to be sent.
// If peer fully closed socket, we would have socket->state set to ERR_RST (connection
// reset) by error callback.
// Avoid sending too small packets, so wait until at least 16 bytes available
while (socket->state >= STATE_CONNECTED && (available = tcp_sndbuf(socket->pcb.tcp)) < 16) {
MICROPY_PY_LWIP_EXIT
if (socket->timeout != -1 && mp_hal_ticks_ms() - start > socket->timeout) {
*_errno = MP_ETIMEDOUT;
return MP_STREAM_ERROR;
}
poll_sockets();
MICROPY_PY_LWIP_REENTER
}
// While we waited, something could happen
STREAM_ERROR_CHECK_WITH_LOCK(socket);
}
u16_t write_len = MIN(available, len);
// If tcp_write returns ERR_MEM then there's currently not enough memory to
// queue the write, so wait and keep trying until it succeeds (with 10s limit).
// Note: if the socket is non-blocking then this code will actually block until
// there's enough memory to do the write, but by this stage we have already
// committed to being able to write the data.
err_t err;
for (int i = 0; i < 200; ++i) {
err = tcp_write(socket->pcb.tcp, buf, write_len, TCP_WRITE_FLAG_COPY);
if (err != ERR_MEM) {
break;
}
err = tcp_output(socket->pcb.tcp);
if (err != ERR_OK) {
break;
}
MICROPY_PY_LWIP_EXIT
mp_hal_delay_ms(50);
MICROPY_PY_LWIP_REENTER
}
// If the output buffer is getting full then send the data to the lower layers
if (err == ERR_OK && tcp_sndbuf(socket->pcb.tcp) < TCP_SND_BUF / 4) {
err = tcp_output(socket->pcb.tcp);
}
MICROPY_PY_LWIP_EXIT
if (err != ERR_OK) {
*_errno = error_lookup_table[-err];
return MP_STREAM_ERROR;
}
return write_len;
}
// Helper function for recv/recvfrom to handle TCP packets
STATIC mp_uint_t lwip_tcp_receive(lwip_socket_obj_t *socket, byte *buf, mp_uint_t len, int *_errno) {
// Check for any pending errors
STREAM_ERROR_CHECK(socket);
if (socket->incoming.pbuf == NULL) {
// Non-blocking socket
if (socket->timeout == 0) {
if (socket->state == STATE_PEER_CLOSED) {
return 0;
}
*_errno = MP_EAGAIN;
return -1;
}
mp_uint_t start = mp_hal_ticks_ms();
while (socket->state == STATE_CONNECTED && socket->incoming.pbuf == NULL) {
if (socket->timeout != -1 && mp_hal_ticks_ms() - start > socket->timeout) {
*_errno = MP_ETIMEDOUT;
return -1;
}
poll_sockets();
}
if (socket->state == STATE_PEER_CLOSED) {
if (socket->incoming.pbuf == NULL) {
// socket closed and no data left in buffer
return 0;
}
} else if (socket->state != STATE_CONNECTED) {
if (socket->state >= STATE_NEW) {
*_errno = MP_ENOTCONN;
} else {
*_errno = error_lookup_table[-socket->state];
}
return -1;
}
}
MICROPY_PY_LWIP_ENTER
assert(socket->pcb.tcp != NULL);
struct pbuf *p = socket->incoming.pbuf;
mp_uint_t remaining = p->len - socket->recv_offset;
if (len > remaining) {
len = remaining;
}
memcpy(buf, (byte *)p->payload + socket->recv_offset, len);
remaining -= len;
if (remaining == 0) {
socket->incoming.pbuf = p->next;
// If we don't ref here, free() will free the entire chain,
// if we ref, it does what we need: frees 1st buf, and decrements
// next buf's refcount back to 1.
pbuf_ref(p->next);
pbuf_free(p);
socket->recv_offset = 0;
} else {
socket->recv_offset += len;
}
tcp_recved(socket->pcb.tcp, len);
MICROPY_PY_LWIP_EXIT
return len;
}
/*******************************************************************************/
// The socket functions provided by lwip.socket.
STATIC const mp_obj_type_t lwip_socket_type;
STATIC void lwip_socket_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
lwip_socket_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "<socket state=%d timeout=%d incoming=%p off=%d>", self->state, self->timeout,
self->incoming.pbuf, self->recv_offset);
}
// FIXME: Only supports two arguments at present
STATIC mp_obj_t lwip_socket_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 0, 4, false);
lwip_socket_obj_t *socket = m_new_obj_with_finaliser(lwip_socket_obj_t);
socket->base.type = &lwip_socket_type;
socket->timeout = -1;
socket->recv_offset = 0;
socket->domain = MOD_NETWORK_AF_INET;
socket->type = MOD_NETWORK_SOCK_STREAM;
socket->callback = MP_OBJ_NULL;
socket->state = STATE_NEW;
if (n_args >= 1) {
socket->domain = mp_obj_get_int(args[0]);
if (n_args >= 2) {
socket->type = mp_obj_get_int(args[1]);
}
}
switch (socket->type) {
case MOD_NETWORK_SOCK_STREAM:
socket->pcb.tcp = tcp_new();
socket->incoming.connection.alloc = 0;
socket->incoming.connection.tcp.item = NULL;
break;
case MOD_NETWORK_SOCK_DGRAM:
socket->pcb.udp = udp_new();
socket->incoming.pbuf = NULL;
break;
#if MICROPY_PY_LWIP_SOCK_RAW
case MOD_NETWORK_SOCK_RAW: {
mp_int_t proto = n_args <= 2 ? 0 : mp_obj_get_int(args[2]);
socket->pcb.raw = raw_new(proto);
break;
}
#endif
default:
mp_raise_OSError(MP_EINVAL);
}
if (socket->pcb.tcp == NULL) {
mp_raise_OSError(MP_ENOMEM);
}
switch (socket->type) {
case MOD_NETWORK_SOCK_STREAM: {
// Register the socket object as our callback argument.
tcp_arg(socket->pcb.tcp, (void *)socket);
// Register our error callback.
tcp_err(socket->pcb.tcp, _lwip_tcp_error);
break;
}
case MOD_NETWORK_SOCK_DGRAM: {
socket->state = STATE_ACTIVE_UDP;
// Register our receive callback now. Since UDP sockets don't require binding or connection
// before use, there's no other good time to do it.
udp_recv(socket->pcb.udp, _lwip_udp_incoming, (void *)socket);
break;
}
#if MICROPY_PY_LWIP_SOCK_RAW
case MOD_NETWORK_SOCK_RAW: {
// Register our receive callback now. Since raw sockets don't require binding or connection
// before use, there's no other good time to do it.
raw_recv(socket->pcb.raw, _lwip_raw_incoming, (void *)socket);
break;
}
#endif
}
return MP_OBJ_FROM_PTR(socket);
}
STATIC mp_obj_t lwip_socket_bind(mp_obj_t self_in, mp_obj_t addr_in) {
lwip_socket_obj_t *socket = MP_OBJ_TO_PTR(self_in);
uint8_t ip[NETUTILS_IPV4ADDR_BUFSIZE];
mp_uint_t port = netutils_parse_inet_addr(addr_in, ip, NETUTILS_BIG);
ip_addr_t bind_addr;
IP4_ADDR(&bind_addr, ip[0], ip[1], ip[2], ip[3]);
err_t err = ERR_ARG;
switch (socket->type) {
case MOD_NETWORK_SOCK_STREAM: {
err = tcp_bind(socket->pcb.tcp, &bind_addr, port);
break;
}
case MOD_NETWORK_SOCK_DGRAM: {
err = udp_bind(socket->pcb.udp, &bind_addr, port);
break;
}
}
if (err != ERR_OK) {
mp_raise_OSError(error_lookup_table[-err]);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(lwip_socket_bind_obj, lwip_socket_bind);
STATIC mp_obj_t lwip_socket_listen(size_t n_args, const mp_obj_t *args) {
lwip_socket_obj_t *socket = MP_OBJ_TO_PTR(args[0]);
mp_int_t backlog = MICROPY_PY_SOCKET_LISTEN_BACKLOG_DEFAULT;
if (n_args > 1) {
backlog = mp_obj_get_int(args[1]);
backlog = (backlog < 0) ? 0 : backlog;
}
if (socket->pcb.tcp == NULL) {
mp_raise_OSError(MP_EBADF);
}
if (socket->type != MOD_NETWORK_SOCK_STREAM) {
mp_raise_OSError(MP_EOPNOTSUPP);
}
struct tcp_pcb *new_pcb;
#if LWIP_VERSION_MACRO < 0x02000100
new_pcb = tcp_listen_with_backlog(socket->pcb.tcp, (u8_t)backlog);
#else
err_t error;
new_pcb = tcp_listen_with_backlog_and_err(socket->pcb.tcp, (u8_t)backlog, &error);
#endif
if (new_pcb == NULL) {
#if LWIP_VERSION_MACRO < 0x02000100
mp_raise_OSError(MP_ENOMEM);
#else
mp_raise_OSError(error_lookup_table[-error]);
#endif
}
socket->pcb.tcp = new_pcb;
// Allocate memory for the backlog of connections
if (backlog <= 1) {
socket->incoming.connection.alloc = 0;
socket->incoming.connection.tcp.item = NULL;
} else {
socket->incoming.connection.alloc = backlog;
socket->incoming.connection.tcp.array = m_new0(struct tcp_pcb *, backlog);
}
socket->incoming.connection.iget = 0;
socket->incoming.connection.iput = 0;
tcp_accept(new_pcb, _lwip_tcp_accept);
// Socket is no longer considered "new" for purposes of polling
socket->state = STATE_LISTENING;
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(lwip_socket_listen_obj, 1, 2, lwip_socket_listen);
STATIC mp_obj_t lwip_socket_accept(mp_obj_t self_in) {
lwip_socket_obj_t *socket = MP_OBJ_TO_PTR(self_in);
if (socket->type != MOD_NETWORK_SOCK_STREAM) {
mp_raise_OSError(MP_EOPNOTSUPP);
}
// Create new socket object, do it here because we must not raise an out-of-memory
// exception when the LWIP concurrency lock is held
lwip_socket_obj_t *socket2 = m_new_obj_with_finaliser(lwip_socket_obj_t);
socket2->base.type = &lwip_socket_type;
MICROPY_PY_LWIP_ENTER
if (socket->pcb.tcp == NULL) {
MICROPY_PY_LWIP_EXIT
m_del_obj(lwip_socket_obj_t, socket2);
mp_raise_OSError(MP_EBADF);
}
// I need to do this because "tcp_accepted", later, is a macro.
struct tcp_pcb *listener = socket->pcb.tcp;
if (listener->state != LISTEN) {
MICROPY_PY_LWIP_EXIT
m_del_obj(lwip_socket_obj_t, socket2);
mp_raise_OSError(MP_EINVAL);
}
// accept incoming connection
struct tcp_pcb *volatile *incoming_connection = &lwip_socket_incoming_array(socket)[socket->incoming.connection.iget];