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Diffstat (limited to 'net/can/raw.c')
-rw-r--r--net/can/raw.c104
1 files changed, 93 insertions, 11 deletions
diff --git a/net/can/raw.c b/net/can/raw.c
index e6b822624..00533f64d 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -91,6 +91,10 @@ struct raw_sock {
int recv_own_msgs;
int fd_frames;
int xl_frames;
+ struct can_raw_vcid_options raw_vcid_opts;
+ canid_t tx_vcid_shifted;
+ canid_t rx_vcid_shifted;
+ canid_t rx_vcid_mask_shifted;
int join_filters;
int count; /* number of active filters */
struct can_filter dfilter; /* default/single filter */
@@ -134,10 +138,29 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
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;
+
+ /* make sure to not pass oversized frames to the socket */
+ if (!ro->xl_frames)
+ return;
+
+ /* filter CAN XL VCID content */
+ if (ro->raw_vcid_opts.flags & CAN_RAW_XL_VCID_RX_FILTER) {
+ /* apply VCID filter if user enabled the filter */
+ if ((cxl->prio & ro->rx_vcid_mask_shifted) !=
+ (ro->rx_vcid_shifted & ro->rx_vcid_mask_shifted))
+ return;
+ } else {
+ /* no filter => do not forward VCID tagged frames */
+ if (cxl->prio & CANXL_VCID_MASK)
+ 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) {
@@ -698,6 +721,19 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
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;
+
+ /* prepare 32 bit values for handling in hot path */
+ ro->tx_vcid_shifted = ro->raw_vcid_opts.tx_vcid << CANXL_VCID_OFFSET;
+ ro->rx_vcid_shifted = ro->raw_vcid_opts.rx_vcid << CANXL_VCID_OFFSET;
+ ro->rx_vcid_mask_shifted = ro->raw_vcid_opts.rx_vcid_mask << CANXL_VCID_OFFSET;
+ break;
+
case CAN_RAW_JOIN_FILTERS:
if (optlen != sizeof(ro->join_filters))
return -EINVAL;
@@ -720,7 +756,6 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
struct raw_sock *ro = raw_sk(sk);
int len;
void *val;
- int err = 0;
if (level != SOL_CAN_RAW)
return -EINVAL;
@@ -730,7 +765,9 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
return -EINVAL;
switch (optname) {
- case CAN_RAW_FILTER:
+ case CAN_RAW_FILTER: {
+ int err = 0;
+
lock_sock(sk);
if (ro->count > 0) {
int fsize = ro->count * sizeof(struct can_filter);
@@ -755,7 +792,7 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
if (!err)
err = put_user(len, optlen);
return err;
-
+ }
case CAN_RAW_ERR_FILTER:
if (len > sizeof(can_err_mask_t))
len = sizeof(can_err_mask_t);
@@ -786,6 +823,25 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
val = &ro->xl_frames;
break;
+ case CAN_RAW_XL_VCID_OPTS: {
+ int err = 0;
+
+ /* 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;
+ }
+ if (!err)
+ err = put_user(len, optlen);
+ return err;
+ }
case CAN_RAW_JOIN_FILTERS:
if (len > sizeof(int))
len = sizeof(int);
@@ -803,23 +859,41 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
return 0;
}
-static bool raw_bad_txframe(struct raw_sock *ro, struct sk_buff *skb, int mtu)
+static void raw_put_canxl_vcid(struct raw_sock *ro, struct sk_buff *skb)
+{
+ struct canxl_frame *cxl = (struct canxl_frame *)skb->data;
+
+ /* sanitize non CAN XL bits */
+ cxl->prio &= (CANXL_PRIO_MASK | CANXL_VCID_MASK);
+
+ /* clear VCID in CAN XL frame if pass through is disabled */
+ if (!(ro->raw_vcid_opts.flags & CAN_RAW_XL_VCID_TX_PASS))
+ cxl->prio &= CANXL_PRIO_MASK;
+
+ /* set VCID in CAN XL frame if enabled */
+ if (ro->raw_vcid_opts.flags & CAN_RAW_XL_VCID_TX_SET) {
+ cxl->prio &= CANXL_PRIO_MASK;
+ cxl->prio |= ro->tx_vcid_shifted;
+ }
+}
+
+static unsigned int raw_check_txframe(struct raw_sock *ro, struct sk_buff *skb, int mtu)
{
/* Classical CAN -> no checks for flags and device capabilities */
if (can_is_can_skb(skb))
- return false;
+ return CAN_MTU;
/* CAN FD -> needs to be enabled and a CAN FD or CAN XL device */
if (ro->fd_frames && can_is_canfd_skb(skb) &&
(mtu == CANFD_MTU || can_is_canxl_dev_mtu(mtu)))
- return false;
+ return CANFD_MTU;
/* 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))
- return false;
+ return CANXL_MTU;
- return true;
+ return 0;
}
static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
@@ -829,6 +903,7 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
struct sockcm_cookie sockc;
struct sk_buff *skb;
struct net_device *dev;
+ unsigned int txmtu;
int ifindex;
int err = -EINVAL;
@@ -869,9 +944,16 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
goto free_skb;
err = -EINVAL;
- if (raw_bad_txframe(ro, skb, dev->mtu))
+
+ /* check for valid CAN (CC/FD/XL) frame content */
+ txmtu = raw_check_txframe(ro, skb, dev->mtu);
+ if (!txmtu)
goto free_skb;
+ /* only CANXL: clear/forward/set VCID value */
+ if (txmtu == CANXL_MTU)
+ raw_put_canxl_vcid(ro, skb);
+
sockcm_init(&sockc, sk);
if (msg->msg_controllen) {
err = sock_cmsg_send(sk, msg, &sockc);
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-05 07:17:59 +0000