@@ -259,3 +259,61 @@ struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf)
return skb;
}
EXPORT_SYMBOL_GPL(alloc_can_err_skb);
+
+/* Check for outgoing skbs that have not been created by the CAN subsystem */
+static bool can_skb_headroom_valid(struct net_device *dev, struct sk_buff *skb)
+{
+ /* af_packet creates a headroom of HH_DATA_MOD bytes which is fine */
+ if (WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct can_skb_priv)))
+ return false;
+
+ /* af_packet does not apply CAN skb specific settings */
+ if (skb->ip_summed == CHECKSUM_NONE) {
+ /* init headroom */
+ can_skb_prv(skb)->ifindex = dev->ifindex;
+ can_skb_prv(skb)->skbcnt = 0;
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ /* perform proper loopback on capable devices */
+ if (dev->flags & IFF_ECHO)
+ skb->pkt_type = PACKET_LOOPBACK;
+ else
+ skb->pkt_type = PACKET_HOST;
+
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+ }
+
+ return true;
+}
+
+/* Drop a given socketbuffer if it does not contain a valid CAN frame. */
+bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb)
+{
+ const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+
+ if (skb->protocol == htons(ETH_P_CAN)) {
+ if (unlikely(skb->len != CAN_MTU ||
+ cfd->len > CAN_MAX_DLEN))
+ goto inval_skb;
+ } else if (skb->protocol == htons(ETH_P_CANFD)) {
+ if (unlikely(skb->len != CANFD_MTU ||
+ cfd->len > CANFD_MAX_DLEN))
+ goto inval_skb;
+ } else {
+ goto inval_skb;
+ }
+
+ if (!can_skb_headroom_valid(dev, skb))
+ goto inval_skb;
+
+ return false;
+
+inval_skb:
+ kfree_skb(skb);
+ dev->stats.tx_dropped++;
+ return true;
+}
+EXPORT_SYMBOL_GPL(can_dropped_invalid_skb);
@@ -31,6 +31,7 @@ struct sk_buff *alloc_canfd_skb(struct net_device *dev,
struct canfd_frame **cfd);
struct sk_buff *alloc_can_err_skb(struct net_device *dev,
struct can_frame **cf);
+bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb);
/*
* The struct can_skb_priv is used to transport additional information along
@@ -96,64 +97,6 @@ static inline struct sk_buff *can_create_echo_skb(struct sk_buff *skb)
return nskb;
}
-/* Check for outgoing skbs that have not been created by the CAN subsystem */
-static inline bool can_skb_headroom_valid(struct net_device *dev,
- struct sk_buff *skb)
-{
- /* af_packet creates a headroom of HH_DATA_MOD bytes which is fine */
- if (WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct can_skb_priv)))
- return false;
-
- /* af_packet does not apply CAN skb specific settings */
- if (skb->ip_summed == CHECKSUM_NONE) {
- /* init headroom */
- can_skb_prv(skb)->ifindex = dev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
-
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- /* perform proper loopback on capable devices */
- if (dev->flags & IFF_ECHO)
- skb->pkt_type = PACKET_LOOPBACK;
- else
- skb->pkt_type = PACKET_HOST;
-
- skb_reset_mac_header(skb);
- skb_reset_network_header(skb);
- skb_reset_transport_header(skb);
- }
-
- return true;
-}
-
-/* Drop a given socketbuffer if it does not contain a valid CAN frame. */
-static inline bool can_dropped_invalid_skb(struct net_device *dev,
- struct sk_buff *skb)
-{
- const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
-
- if (skb->protocol == htons(ETH_P_CAN)) {
- if (unlikely(skb->len != CAN_MTU ||
- cfd->len > CAN_MAX_DLEN))
- goto inval_skb;
- } else if (skb->protocol == htons(ETH_P_CANFD)) {
- if (unlikely(skb->len != CANFD_MTU ||
- cfd->len > CANFD_MAX_DLEN))
- goto inval_skb;
- } else
- goto inval_skb;
-
- if (!can_skb_headroom_valid(dev, skb))
- goto inval_skb;
-
- return false;
-
-inval_skb:
- kfree_skb(skb);
- dev->stats.tx_dropped++;
- return true;
-}
-
static inline bool can_is_canfd_skb(const struct sk_buff *skb)
{
/* the CAN specific type of skb is identified by its data length */
The functions can_dropped_invalid_skb() and can_skb_headroom_valid() grew a lot over the years to a point which it does not make much sense to have them defined as static inline in header files. Move those two functions to the .c counterpart of skb.h. can_skb_headroom_valid()'s only caller being can_dropped_invalid_skb(), the declaration is removed from the header. Only can_dropped_invalid_skb() gets its symbol exported. While doing so, do a small cleanup: add brackets around the else block in can_dropped_invalid_skb(). Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> --- drivers/net/can/dev/skb.c | 58 ++++++++++++++++++++++++++++++++++++++ include/linux/can/skb.h | 59 +-------------------------------------- 2 files changed, 59 insertions(+), 58 deletions(-)