--- /dev/null
+/*
+ * CAN c support to connect to the Linux host SocketCAN interfaces
+ *
+ * Copyright (c) 2013-2014 Jin Yang
+ * Copyright (c) 2014-2018 Pavel Pisa
+ *
+ * Initial development supported by Google GSoC 2013 from RTEMS project slot
+ *
+ * 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 "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qapi/error.h"
+#include "chardev/char.h"
+#include "qemu/sockets.h"
+#include "qemu/error-report.h"
+#include "net/can_emu.h"
+#include "net/can_host.h"
+
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <linux/can.h>
+#include <linux/can/raw.h>
+
+#ifndef DEBUG_CAN
+#define DEBUG_CAN 0
+#endif /*DEBUG_CAN*/
+
+#define TYPE_CAN_HOST_SOCKETCAN "can-host-socketcan"
+#define CAN_HOST_SOCKETCAN(obj) \
+ OBJECT_CHECK(CanHostSocketCAN, (obj), TYPE_CAN_HOST_SOCKETCAN)
+
+#define CAN_READ_BUF_LEN 5
+typedef struct CanHostSocketCAN {
+ CanHostState parent;
+ char *ifname;
+
+ qemu_can_filter *rfilter;
+ int rfilter_num;
+ can_err_mask_t err_mask;
+
+ qemu_can_frame buf[CAN_READ_BUF_LEN];
+ int bufcnt;
+ int bufptr;
+
+ int fd;
+} CanHostSocketCAN;
+
+/* Check that QEMU and Linux kernel flags encoding and structure matches */
+QEMU_BUILD_BUG_ON(QEMU_CAN_EFF_FLAG != CAN_EFF_FLAG);
+QEMU_BUILD_BUG_ON(QEMU_CAN_RTR_FLAG != CAN_RTR_FLAG);
+QEMU_BUILD_BUG_ON(QEMU_CAN_ERR_FLAG != CAN_ERR_FLAG);
+QEMU_BUILD_BUG_ON(QEMU_CAN_INV_FILTER != CAN_INV_FILTER);
+QEMU_BUILD_BUG_ON(offsetof(qemu_can_frame, data)
+ != offsetof(struct can_frame, data));
+
+static void can_host_socketcan_display_msg(struct qemu_can_frame *msg)
+{
+ int i;
+
+ qemu_log_lock();
+ qemu_log("[cansocketcan]: %03X [%01d] %s %s",
+ msg->can_id & QEMU_CAN_EFF_MASK,
+ msg->can_dlc,
+ msg->can_id & QEMU_CAN_EFF_FLAG ? "EFF" : "SFF",
+ msg->can_id & QEMU_CAN_RTR_FLAG ? "RTR" : "DAT");
+
+ for (i = 0; i < msg->can_dlc; i++) {
+ qemu_log(" %02X", msg->data[i]);
+ }
+ qemu_log("\n");
+ qemu_log_flush();
+ qemu_log_unlock();
+}
+
+static void can_host_socketcan_read(void *opaque)
+{
+ CanHostSocketCAN *c = opaque;
+ CanHostState *ch = CAN_HOST(c);
+
+ /* CAN_READ_BUF_LEN for multiple messages syscall is possible for future */
+ c->bufcnt = read(c->fd, c->buf, sizeof(qemu_can_frame));
+ if (c->bufcnt < 0) {
+ warn_report("CAN bus host read failed (%s)", strerror(errno));
+ return;
+ }
+
+ can_bus_client_send(&ch->bus_client, c->buf, 1);
+
+ if (DEBUG_CAN) {
+ can_host_socketcan_display_msg(c->buf);
+ }
+}
+
+static int can_host_socketcan_can_receive(CanBusClientState *client)
+{
+ return 1;
+}
+
+static ssize_t can_host_socketcan_receive(CanBusClientState *client,
+ const qemu_can_frame *frames, size_t frames_cnt)
+{
+ CanHostState *ch = container_of(client, CanHostState, bus_client);
+ CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(ch);
+
+ size_t len = sizeof(qemu_can_frame);
+ int res;
+
+ if (c->fd < 0) {
+ return -1;
+ }
+
+ res = write(c->fd, frames, len);
+
+ if (!res) {
+ warn_report("[cansocketcan]: write message to host returns zero");
+ return -1;
+ }
+
+ if (res != len) {
+ if (res < 0) {
+ warn_report("[cansocketcan]: write to host failed (%s)",
+ strerror(errno));
+ } else {
+ warn_report("[cansocketcan]: write to host truncated");
+ }
+ return -1;
+ }
+
+ return 1;
+}
+
+static void can_host_socketcan_disconnect(CanHostState *ch)
+{
+ CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(ch);
+
+ if (c->fd >= 0) {
+ qemu_set_fd_handler(c->fd, NULL, NULL, c);
+ close(c->fd);
+ c->fd = -1;
+ }
+
+ g_free(c->rfilter);
+ c->rfilter = NULL;
+ c->rfilter_num = 0;
+}
+
+static CanBusClientInfo can_host_socketcan_bus_client_info = {
+ .can_receive = can_host_socketcan_can_receive,
+ .receive = can_host_socketcan_receive,
+};
+
+static void can_host_socketcan_connect(CanHostState *ch, Error **errp)
+{
+ CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(ch);
+ int s; /* can raw socket */
+ struct sockaddr_can addr;
+ struct ifreq ifr;
+
+ /* open socket */
+ s = qemu_socket(PF_CAN, SOCK_RAW, CAN_RAW);
+ if (s < 0) {
+ error_setg_errno(errp, errno, "failed to create CAN_RAW socket");
+ return;
+ }
+
+ addr.can_family = AF_CAN;
+ memset(&ifr.ifr_name, 0, sizeof(ifr.ifr_name));
+ strcpy(ifr.ifr_name, c->ifname);
+ if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
+ error_setg_errno(errp, errno,
+ "SocketCAN host interface %s not available", c->ifname);
+ goto fail;
+ }
+ addr.can_ifindex = ifr.ifr_ifindex;
+
+ c->err_mask = 0xffffffff; /* Receive error frame. */
+ setsockopt(s, SOL_CAN_RAW, CAN_RAW_ERR_FILTER,
+ &c->err_mask, sizeof(c->err_mask));
+
+ c->rfilter_num = 1;
+ c->rfilter = g_new(struct qemu_can_filter, c->rfilter_num);
+
+ /* Receive all data frame. If |= CAN_INV_FILTER no data. */
+ c->rfilter[0].can_id = 0;
+ c->rfilter[0].can_mask = 0;
+ c->rfilter[0].can_mask &= ~CAN_ERR_FLAG;
+
+ setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, c->rfilter,
+ c->rfilter_num * sizeof(struct qemu_can_filter));
+
+ if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+ error_setg_errno(errp, errno, "failed to bind to host interface %s",
+ c->ifname);
+ goto fail;
+ }
+
+ c->fd = s;
+ ch->bus_client.info = &can_host_socketcan_bus_client_info;
+ qemu_set_fd_handler(c->fd, can_host_socketcan_read, NULL, c);
+ return;
+
+fail:
+ close(s);
+ g_free(c->rfilter);
+ c->rfilter = NULL;
+ c->rfilter_num = 0;
+}
+
+static char *can_host_socketcan_get_if(Object *obj, Error **errp)
+{
+ CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(obj);
+
+ return g_strdup(c->ifname);
+}
+
+static void can_host_socketcan_set_if(Object *obj, const char *value, Error **errp)
+{
+ CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(obj);
+ struct ifreq ifr;
+
+ if (strlen(value) >= sizeof(ifr.ifr_name)) {
+ error_setg(errp, "CAN interface name longer than %zd characters",
+ sizeof(ifr.ifr_name) - 1);
+ return;
+ }
+
+ if (c->fd != -1) {
+ error_setg(errp, "CAN interface already connected");
+ return;
+ }
+
+ g_free(c->ifname);
+ c->ifname = g_strdup(value);
+}
+
+static void can_host_socketcan_instance_init(Object *obj)
+{
+ CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(obj);
+
+ c->fd = -1;
+}
+
+static void can_host_socketcan_class_init(ObjectClass *klass,
+ void *class_data G_GNUC_UNUSED)
+{
+ CanHostClass *chc = CAN_HOST_CLASS(klass);
+
+ object_class_property_add_str(klass, "if",
+ can_host_socketcan_get_if,
+ can_host_socketcan_set_if,
+ &error_abort);
+ chc->connect = can_host_socketcan_connect;
+ chc->disconnect = can_host_socketcan_disconnect;
+}
+
+static const TypeInfo can_host_socketcan_info = {
+ .parent = TYPE_CAN_HOST,
+ .name = TYPE_CAN_HOST_SOCKETCAN,
+ .instance_size = sizeof(CanHostSocketCAN),
+ .instance_init = can_host_socketcan_instance_init,
+ .class_init = can_host_socketcan_class_init,
+};
+
+static void can_host_register_types(void)
+{
+ type_register_static(&can_host_socketcan_info);
+}
+
+type_init(can_host_register_types);
projects / qemu-nvme.git / commitdiff