CAN XL data frames contain an 8-bit virtual CAN network identifier (VCID).
A VCID value of zero represents an 'untagged' CAN XL frame.
To receive and send these optional VCIDs via CAN_RAW sockets a new socket
option CAN_RAW_XL_VCID_OPTS is introduced to define/access VCID content:
- tx: set the outgoing VCID value by the kernel (one fixed 8-bit value)
- tx: pass through VCID values from the user space (e.g. for traffic replay)
- rx: apply VCID receive filter (value/mask) to be passed to the user space
With the 'tx pass through' option CAN_RAW_XL_VCID_TX_PASS all valid VCID
values can be send, e.g. to replay full qualified CAN XL traffic.
The VCID value provided for the CAN_RAW_XL_VCID_TX_SET option will
override the VCID value in the struct canxl_frame.vcid element defined
for CAN_RAW_XL_VCID_TX_PASS when both flags are set.
With a rx_vcid_mask of zero all possible VCID values (0x00 - 0xFF) are
passed to the user space when the CAN_RAW_XL_VCID_RX_FILTER flag is set.
Without this flag only untagged CAN XL frames (VCID = 0x00) are delivered
to the user space.
Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
---
include/uapi/linux/can.h | 39 ++++++++++++++-------
include/uapi/linux/can/raw.h | 14 ++++++++
net/can/af_can.c | 2 ++
net/can/raw.c | 66 ++++++++++++++++++++++++++++++++++--
4 files changed, 105 insertions(+), 16 deletions(-)
diff --git a/include/uapi/linux/can.h b/include/uapi/linux/can.h
index 939db2388208..b20268a944e6 100644
--- a/include/uapi/linux/can.h
+++ b/include/uapi/linux/can.h
@@ -193,26 +193,39 @@ struct canfd_frame {
#define CANXL_XLF 0x80 /* mandatory CAN XL frame flag (must always be set!) */
#define CANXL_SEC 0x01 /* Simple Extended Content (security/segmentation) */
/**
* struct canxl_frame - CAN with e'X'tended frame 'L'ength frame structure
- * @prio: 11 bit arbitration priority with zero'ed CAN_*_FLAG flags
- * @flags: additional flags for CAN XL
- * @sdt: SDU (service data unit) type
- * @len: frame payload length in byte (CANXL_MIN_DLEN .. CANXL_MAX_DLEN)
- * @af: acceptance field
- * @data: CAN XL frame payload (CANXL_MIN_DLEN .. CANXL_MAX_DLEN byte)
+ * @prio: 11 bit arbitration priority with zero'ed CAN_*_FLAG flags
+ * @vcid: virtual CAN network identifier
+ * @__res0: reserved / padding must be set to 0
+ * @flags: additional flags for CAN XL
+ * @sdt: SDU (service data unit) type
+ * @len: frame payload length in byte (CANXL_MIN_DLEN .. CANXL_MAX_DLEN)
+ * @af: acceptance field
+ * @data: CAN XL frame payload (CANXL_MIN_DLEN .. CANXL_MAX_DLEN byte)
*
- * @prio shares the same position as @can_id from struct can[fd]_frame.
+ * @prio shares the lower 16 bits of @can_id from struct can[fd]_frame.
+ * @__res0 holds the @can_id flags CAN_xxx_FLAG and has to be set to zero
*/
struct canxl_frame {
- canid_t prio; /* 11 bit priority for arbitration (canid_t) */
- __u8 flags; /* additional flags for CAN XL */
- __u8 sdt; /* SDU (service data unit) type */
- __u16 len; /* frame payload length in byte */
- __u32 af; /* acceptance field */
- __u8 data[CANXL_MAX_DLEN];
+#if defined(__LITTLE_ENDIAN)
+ __u16 prio; /* 11 bit priority for arbitration */
+ __u8 vcid; /* virtual CAN network identifier */
+ __u8 __res0; /* reserved / padding must be set to 0 */
+#elif defined(__BIG_ENDIAN)
+ __u8 __res0; /* reserved / padding must be set to 0 */
+ __u8 vcid; /* virtual CAN network identifier */
+ __u16 prio; /* 11 bit priority for arbitration */
+#else
+#error "Unknown endianness"
+#endif
+ __u8 flags; /* additional flags for CAN XL */
+ __u8 sdt; /* SDU (service data unit) type */
+ __u16 len; /* frame payload length in byte */
+ __u32 af; /* acceptance field */
+ __u8 data[CANXL_MAX_DLEN];
};
#define CAN_MTU (sizeof(struct can_frame))
#define CANFD_MTU (sizeof(struct canfd_frame))
#define CANXL_MTU (sizeof(struct canxl_frame))
diff --git a/include/uapi/linux/can/raw.h b/include/uapi/linux/can/raw.h
index 31622c9b7988..8890b0d2fd48 100644
--- a/include/uapi/linux/can/raw.h
+++ b/include/uapi/linux/can/raw.h
@@ -63,8 +63,22 @@ enum {
CAN_RAW_LOOPBACK, /* local loopback (default:on) */
CAN_RAW_RECV_OWN_MSGS, /* receive my own msgs (default:off) */
CAN_RAW_FD_FRAMES, /* allow CAN FD frames (default:off) */
CAN_RAW_JOIN_FILTERS, /* all filters must match to trigger */
CAN_RAW_XL_FRAMES, /* allow CAN XL frames (default:off) */
+ CAN_RAW_XL_VCID_OPTS, /* CAN XL VCID configuration options */
};
+struct can_raw_vcid_options {
+
+ __u8 flags; /* flags for vcid (filter) behaviour */
+ __u8 tx_vcid; /* VCID value set into canxl_frame.prio */
+ __u8 rx_vcid; /* VCID value for VCID filter */
+ __u8 rx_vcid_mask; /* VCID mask for VCID filter */
+
+};
+
+#define CAN_RAW_XL_VCID_TX_SET 0x01
+#define CAN_RAW_XL_VCID_TX_PASS 0x02
+#define CAN_RAW_XL_VCID_RX_FILTER 0x04
+
#endif /* !_UAPI_CAN_RAW_H */
diff --git a/net/can/af_can.c b/net/can/af_can.c
index 7343fd487dbe..707576eeeb58 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -863,10 +863,12 @@ static __init int can_init(void)
int err;
/* check for correct padding to be able to use the structs similarly */
BUILD_BUG_ON(offsetof(struct can_frame, len) !=
offsetof(struct canfd_frame, len) ||
+ offsetof(struct can_frame, len) !=
+ offsetof(struct canxl_frame, flags) ||
offsetof(struct can_frame, data) !=
offsetof(struct canfd_frame, data));
pr_info("can: controller area network core\n");
diff --git a/net/can/raw.c b/net/can/raw.c
index e6b822624ba2..3083df64723c 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -89,10 +89,11 @@ struct raw_sock {
struct list_head notifier;
int loopback;
int recv_own_msgs;
int fd_frames;
int xl_frames;
+ struct can_raw_vcid_options raw_vcid_opts;
int join_filters;
int count; /* number of active filters */
struct can_filter dfilter; /* default/single filter */
struct can_filter *filter; /* pointer to filter(s) */
can_err_mask_t err_mask;
@@ -132,14 +133,34 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
/* check the received tx sock reference */
if (!ro->recv_own_msgs && oskb->sk == sk)
return;
/* make sure to not pass oversized frames to the socket */
- if ((!ro->fd_frames && can_is_canfd_skb(oskb)) ||
- (!ro->xl_frames && can_is_canxl_skb(oskb)))
+ if (!ro->fd_frames && can_is_canfd_skb(oskb))
return;
+ if (can_is_canxl_skb(oskb)) {
+ struct canxl_frame *cxl = (struct canxl_frame *)oskb->data;
+ struct can_raw_vcid_options *ropts = &ro->raw_vcid_opts;
+
+ /* make sure to not pass oversized frames to the socket */
+ if (!ro->xl_frames)
+ return;
+
+ /* filter CAN XL VCID content */
+ if (ropts->flags & CAN_RAW_XL_VCID_RX_FILTER) {
+ /* apply VCID filter if user enabled the filter */
+ if ((cxl->vcid & ropts->rx_vcid_mask) !=
+ (ropts->rx_vcid & ropts->rx_vcid_mask))
+ return;
+ } else {
+ /* no filter => do not forward VCID tagged frames */
+ if (cxl->vcid)
+ return;
+ }
+ }
+
/* eliminate multiple filter matches for the same skb */
if (this_cpu_ptr(ro->uniq)->skb == oskb &&
this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
if (!ro->join_filters)
return;
@@ -696,10 +717,19 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
/* Enabling CAN XL includes CAN FD */
if (ro->xl_frames)
ro->fd_frames = ro->xl_frames;
break;
+ case CAN_RAW_XL_VCID_OPTS:
+ if (optlen != sizeof(ro->raw_vcid_opts))
+ return -EINVAL;
+
+ if (copy_from_sockptr(&ro->raw_vcid_opts, optval, optlen))
+ return -EFAULT;
+
+ break;
+
case CAN_RAW_JOIN_FILTERS:
if (optlen != sizeof(ro->join_filters))
return -EINVAL;
if (copy_from_sockptr(&ro->join_filters, optval, optlen))
@@ -784,10 +814,25 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
if (len > sizeof(int))
len = sizeof(int);
val = &ro->xl_frames;
break;
+ case CAN_RAW_XL_VCID_OPTS:
+ /* user space buffer to small for VCID opts? */
+ if (len < sizeof(ro->raw_vcid_opts)) {
+ /* return -ERANGE and needed space in optlen */
+ err = -ERANGE;
+ if (put_user(sizeof(ro->raw_vcid_opts), optlen))
+ err = -EFAULT;
+ } else {
+ if (len > sizeof(ro->raw_vcid_opts))
+ len = sizeof(ro->raw_vcid_opts);
+ if (copy_to_user(optval, &ro->raw_vcid_opts, len))
+ err = -EFAULT;
+ }
+ break;
+
case CAN_RAW_JOIN_FILTERS:
if (len > sizeof(int))
len = sizeof(int);
val = &ro->join_filters;
break;
@@ -814,12 +859,27 @@ static bool raw_bad_txframe(struct raw_sock *ro, struct sk_buff *skb, int mtu)
(mtu == CANFD_MTU || can_is_canxl_dev_mtu(mtu)))
return false;
/* CAN XL -> needs to be enabled and a CAN XL device */
if (ro->xl_frames && can_is_canxl_skb(skb) &&
- can_is_canxl_dev_mtu(mtu))
+ can_is_canxl_dev_mtu(mtu)) {
+ struct canxl_frame *cxl = (struct canxl_frame *)skb->data;
+ struct can_raw_vcid_options *ropts = &ro->raw_vcid_opts;
+
+ /* sanitize non CAN XL bits */
+ cxl->__res0 = 0;
+
+ /* clear VCID in CAN XL frame if pass through is disabled */
+ if (!(ropts->flags & CAN_RAW_XL_VCID_TX_PASS))
+ cxl->vcid = 0;
+
+ /* set VCID in CAN XL frame if enabled */
+ if (ropts->flags & CAN_RAW_XL_VCID_TX_SET)
+ cxl->vcid = ropts->tx_vcid;
+
return false;
+ }
return true;
}
static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
--
2.34.1
