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* Copyright (c) 2019 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdbool.h>
#include <fcntl.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(net_sock_can, CONFIG_NET_SOCKETS_LOG_LEVEL);
#include <kernel.h>
#include <entropy.h>
#include <misc/util.h>
#include <net/net_context.h>
#include <net/net_pkt.h>
#include <net/socket.h>
#include <syscall_handler.h>
#include <misc/fdtable.h>
#include <net/socket_can.h>
#include "sockets_internal.h"
extern const struct socket_op_vtable sock_fd_op_vtable;
static const struct socket_op_vtable can_sock_fd_op_vtable;
static inline int k_fifo_wait_non_empty(struct k_fifo *fifo, int32_t timeout)
{
struct k_poll_event events[] = {
K_POLL_EVENT_INITIALIZER(K_POLL_TYPE_FIFO_DATA_AVAILABLE,
K_POLL_MODE_NOTIFY_ONLY, fifo),
};
return k_poll(events, ARRAY_SIZE(events), timeout);
}
int zcan_socket(int family, int type, int proto)
{
struct net_context *ctx;
int fd;
int ret;
if (proto != CAN_RAW) {
errno = EOPNOTSUPP;
return -1;
}
fd = z_reserve_fd();
if (fd < 0) {
return -1;
}
ret = net_context_get(family, type, proto, &ctx);
if (ret < 0) {
z_free_fd(fd);
errno = -ret;
return -1;
}
/* Initialize user_data, all other calls will preserve it */
ctx->user_data = NULL;
k_fifo_init(&ctx->recv_q);
#ifdef CONFIG_USERSPACE
/* Set net context object as initialized and grant access to the
* calling thread (and only the calling thread)
*/
z_object_recycle(ctx);
#endif
z_finalize_fd(fd, ctx,
(const struct fd_op_vtable *)&can_sock_fd_op_vtable);
return fd;
}
static void zcan_received_cb(struct net_context *ctx, struct net_pkt *pkt,
union net_ip_header *ip_hdr,
union net_proto_header *proto_hdr,
int status, void *user_data)
{
NET_DBG("ctx %p pkt %p st %d ud %p", ctx, pkt, status, user_data);
/* if pkt is NULL, EOF */
if (!pkt) {
struct net_pkt *last_pkt = k_fifo_peek_tail(&ctx->recv_q);
if (!last_pkt) {
/* If there're no packets in the queue, recv() may
* be blocked waiting on it to become non-empty,
* so cancel that wait.
*/
sock_set_eof(ctx);
k_fifo_cancel_wait(&ctx->recv_q);
NET_DBG("Marked socket %p as peer-closed", ctx);
} else {
net_pkt_set_eof(last_pkt, true);
NET_DBG("Set EOF flag on pkt %p", ctx);
}
return;
}
/* Normal packet */
net_pkt_set_eof(pkt, false);
k_fifo_put(&ctx->recv_q, pkt);
}
static int zcan_bind_ctx(struct net_context *ctx, const struct sockaddr *addr,
socklen_t addrlen)
{
struct sockaddr_can *can_addr = (struct sockaddr_can *)addr;
struct net_if *iface;
int ret;
if (addrlen != sizeof(struct sockaddr_can)) {
return -EINVAL;
}
iface = net_if_get_by_index(can_addr->can_ifindex);
if (!iface) {
return -ENOENT;
}
net_context_set_iface(ctx, iface);
ret = net_context_bind(ctx, addr, addrlen);
if (ret < 0) {
errno = -ret;
return -1;
}
/* For CAN socket, we expect to receive packets after call to bind().
*/
ret = net_context_recv(ctx, zcan_received_cb, K_NO_WAIT,
ctx->user_data);
if (ret < 0) {
errno = -ret;
return -1;
}
return 0;
}
ssize_t zcan_sendto_ctx(struct net_context *ctx, const void *buf, size_t len,
int flags, const struct sockaddr *dest_addr,
socklen_t addrlen)
{
struct sockaddr_can can_addr;
struct zcan_frame zframe;
s32_t timeout = K_FOREVER;
int ret;
/* Setting destination address does not probably make sense here so
* ignore it. You need to use bind() to set the CAN interface.
*/
if (dest_addr) {
NET_DBG("CAN destination address ignored");
}
if ((flags & ZSOCK_MSG_DONTWAIT) || sock_is_nonblock(ctx)) {
timeout = K_NO_WAIT;
}
if (addrlen == 0) {
addrlen = sizeof(struct sockaddr_can);
}
if (dest_addr == NULL) {
memset(&can_addr, 0, sizeof(can_addr));
can_addr.can_ifindex = -1;
can_addr.can_family = AF_CAN;
dest_addr = (struct sockaddr *)&can_addr;
}
NET_ASSERT(len == sizeof(struct can_frame));
can_copy_frame_to_zframe((struct can_frame *)buf, &zframe);
ret = net_context_sendto(ctx, (void *)&zframe, sizeof(zframe),
dest_addr, addrlen, NULL, timeout,
ctx->user_data);
if (ret < 0) {
errno = -ret;
return -1;
}
return len;
}
static ssize_t zcan_recvfrom_ctx(struct net_context *ctx, void *buf,
size_t max_len, int flags,
struct sockaddr *src_addr,
socklen_t *addrlen)
{
struct zcan_frame zframe;
size_t recv_len = 0;
s32_t timeout = K_FOREVER;
struct net_pkt *pkt;
if ((flags & ZSOCK_MSG_DONTWAIT) || sock_is_nonblock(ctx)) {
timeout = K_NO_WAIT;
}
if (flags & ZSOCK_MSG_PEEK) {
int ret;
ret = k_fifo_wait_non_empty(&ctx->recv_q, timeout);
/* EAGAIN when timeout expired, EINTR when cancelled */
if (ret && ret != -EAGAIN && ret != -EINTR) {
errno = -ret;
return -1;
}
pkt = k_fifo_peek_head(&ctx->recv_q);
} else {
pkt = k_fifo_get(&ctx->recv_q, timeout);
}
if (!pkt) {
errno = EAGAIN;
return -1;
}
/* We do not handle any headers here, just pass the whole packet to
* the caller.
*/
recv_len = net_pkt_get_len(pkt);
if (recv_len > max_len) {
recv_len = max_len;
}
if (net_pkt_read(pkt, (void *)&zframe, sizeof(zframe))) {
errno = EIO;
return -1;
}
if (!(flags & ZSOCK_MSG_PEEK)) {
net_pkt_unref(pkt);
} else {
net_pkt_cursor_init(pkt);
}
NET_ASSERT(recv_len == sizeof(struct can_frame));
can_copy_zframe_to_frame(&zframe, (struct can_frame *)buf);
return recv_len;
}
static int zcan_getsockopt_ctx(struct net_context *ctx, int level, int optname,
void *optval, socklen_t *optlen)
{
if (!optval || !optlen) {
errno = EINVAL;
return -1;
}
return sock_fd_op_vtable.getsockopt(ctx, level, optname,
optval, optlen);
}
static int zcan_setsockopt_ctx(struct net_context *ctx, int level, int optname,
const void *optval, socklen_t optlen)
{
return sock_fd_op_vtable.setsockopt(ctx, level, optname,
optval, optlen);
}
static ssize_t can_sock_read_vmeth(void *obj, void *buffer, size_t count)
{
return zcan_recvfrom_ctx(obj, buffer, count, 0, NULL, 0);
}
static ssize_t can_sock_write_vmeth(void *obj, const void *buffer,
size_t count)
{
return zcan_sendto_ctx(obj, buffer, count, 0, NULL, 0);
}
static int can_sock_ioctl_vmeth(void *obj, unsigned int request, va_list args)
{
return sock_fd_op_vtable.fd_vtable.ioctl(obj, request, args);
}
/*
* TODO: A CAN socket can be bound to a network device using SO_BINDTODEVICE.
*/
static int can_sock_bind_vmeth(void *obj, const struct sockaddr *addr,
socklen_t addrlen)
{
return zcan_bind_ctx(obj, addr, addrlen);
}
/* The connect() function is no longer necessary. */
static int can_sock_connect_vmeth(void *obj, const struct sockaddr *addr,
socklen_t addrlen)
{
return 0;
}
/*
* The listen() and accept() functions are without any functionality,
* since the client-Server-Semantic is no longer present.
* When we use RAW-sockets we are sending unconnected packets.
*/
static int can_sock_listen_vmeth(void *obj, int backlog)
{
return 0;
}
static int can_sock_accept_vmeth(void *obj, struct sockaddr *addr,
socklen_t *addrlen)
{
return 0;
}
static ssize_t can_sock_sendto_vmeth(void *obj, const void *buf, size_t len,
int flags,
const struct sockaddr *dest_addr,
socklen_t addrlen)
{
return zcan_sendto_ctx(obj, buf, len, flags, dest_addr, addrlen);
}
static ssize_t can_sock_recvfrom_vmeth(void *obj, void *buf, size_t max_len,
int flags, struct sockaddr *src_addr,
socklen_t *addrlen)
{
return zcan_recvfrom_ctx(obj, buf, max_len, flags,
src_addr, addrlen);
}
static int can_sock_getsockopt_vmeth(void *obj, int level, int optname,
void *optval, socklen_t *optlen)
{
if (level == SOL_CAN_RAW) {
const struct canbus_api *api;
struct net_if *iface;
struct device *dev;
if (optval == NULL) {
errno = EINVAL;
return -1;
}
iface = net_context_get_iface(obj);
dev = net_if_get_device(iface);
api = dev->driver_api;
if (!api->getsockopt) {
errno = ENOTSUP;
return -1;
}
return api->getsockopt(dev, obj, level, optname, optval,
optlen);
}
return zcan_getsockopt_ctx(obj, level, optname, optval, optlen);
}
static int can_sock_setsockopt_vmeth(void *obj, int level, int optname,
const void *optval, socklen_t optlen)
{
if (level == SOL_CAN_RAW) {
const struct canbus_api *api;
struct net_if *iface;
struct device *dev;
/* The application must use can_filter and then we convert
* it to zcan_filter as the CANBUS drivers expects that.
*/
if (optname == CAN_RAW_FILTER &&
optlen != sizeof(struct can_filter)) {
errno = EINVAL;
return -1;
}
if (optval == NULL) {
errno = EINVAL;
return -1;
}
iface = net_context_get_iface(obj);
dev = net_if_get_device(iface);
api = dev->driver_api;
if (!api->setsockopt) {
errno = ENOTSUP;
return -1;
}
if (optname == CAN_RAW_FILTER) {
struct zcan_filter zfilter;
can_copy_filter_to_zfilter((struct can_filter *)optval,
&zfilter);
return api->setsockopt(dev, obj, level, optname,
&zfilter, sizeof(zfilter));
}
return api->setsockopt(dev, obj, level, optname,
optval, optlen);
}
return zcan_setsockopt_ctx(obj, level, optname, optval, optlen);
}
static const struct socket_op_vtable can_sock_fd_op_vtable = {
.fd_vtable = {
.read = can_sock_read_vmeth,
.write = can_sock_write_vmeth,
.ioctl = can_sock_ioctl_vmeth,
},
.bind = can_sock_bind_vmeth,
.connect = can_sock_connect_vmeth,
.listen = can_sock_listen_vmeth,
.accept = can_sock_accept_vmeth,
.sendto = can_sock_sendto_vmeth,
.recvfrom = can_sock_recvfrom_vmeth,
.getsockopt = can_sock_getsockopt_vmeth,
.setsockopt = can_sock_setsockopt_vmeth,
};
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