This patch makes the private functions alloc_can_skb() and alloc_can_err_skb() of the at91_can driver public and adapts all drivers to use these. While making the patch I realized, that the skb's are *not* setup consistently. It's now done as shown below:
skb->protocol = __constant_htons(ETH_P_CAN); skb->pkt_type = PACKET_BROADCAST; skb->ip_summed = CHECKSUM_UNNECESSARY; *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); memset(*cf, 0, sizeof(struct can_frame)); The frame is zeroed out to avoid uninitialized data to be passed to user space. Some drivers or library code used "htons(ETH_P_CAN)" or did not set "pkt_type" or "ip_summed" or did not zero the fame. Signed-off-by: Wolfgang Grandegger <[email protected]> --- drivers/net/can/at91_can.c | 32 --------------------------- drivers/net/can/dev.c | 44 +++++++++++++++++++++++++++++++------- drivers/net/can/sja1000/sja1000.c | 12 +--------- drivers/net/can/ti_hecc.c | 17 +++----------- drivers/net/can/usb/ems_usb.c | 16 +------------ 5 files changed, 44 insertions(+), 77 deletions(-) Index: net-next-2.6/drivers/net/can/dev.c =================================================================== --- net-next-2.6.orig/drivers/net/can/dev.c +++ net-next-2.6/drivers/net/can/dev.c @@ -291,7 +291,7 @@ void can_put_echo_skb(struct sk_buff *sk skb->sk = srcsk; /* make settings for echo to reduce code in irq context */ - skb->protocol = htons(ETH_P_CAN); + skb->protocol = __constant_htons(ETH_P_CAN); skb->pkt_type = PACKET_BROADCAST; skb->ip_summed = CHECKSUM_UNNECESSARY; skb->dev = dev; @@ -366,17 +366,12 @@ void can_restart(unsigned long data) can_flush_echo_skb(dev); /* send restart message upstream */ - skb = dev_alloc_skb(sizeof(struct can_frame)); + skb = alloc_can_err_skb(dev, &cf); if (skb == NULL) { err = -ENOMEM; goto restart; } - skb->dev = dev; - skb->protocol = htons(ETH_P_CAN); - cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); - memset(cf, 0, sizeof(struct can_frame)); - cf->can_id = CAN_ERR_FLAG | CAN_ERR_RESTARTED; - cf->can_dlc = CAN_ERR_DLC; + cf->can_id |= CAN_ERR_RESTARTED; netif_rx(skb); @@ -449,6 +444,39 @@ static void can_setup(struct net_device dev->features = NETIF_F_NO_CSUM; } +struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf) +{ + struct sk_buff *skb; + + skb = netdev_alloc_skb(dev, sizeof(struct can_frame)); + if (unlikely(!skb)) + return NULL; + + skb->protocol = __constant_htons(ETH_P_CAN); + skb->pkt_type = PACKET_BROADCAST; + skb->ip_summed = CHECKSUM_UNNECESSARY; + *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); + memset(*cf, 0, sizeof(struct can_frame)); + + return skb; +} +EXPORT_SYMBOL_GPL(alloc_can_skb); + +struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf) +{ + struct sk_buff *skb; + + skb = alloc_can_skb(dev, cf); + if (unlikely(!skb)) + return NULL; + + (*cf)->can_id = CAN_ERR_FLAG; + (*cf)->can_dlc = CAN_ERR_DLC; + + return skb; +} +EXPORT_SYMBOL_GPL(alloc_can_err_skb); + /* * Allocate and setup space for the CAN network device */ Index: net-next-2.6/drivers/net/can/at91_can.c =================================================================== --- net-next-2.6.orig/drivers/net/can/at91_can.c +++ net-next-2.6/drivers/net/can/at91_can.c @@ -221,38 +221,6 @@ static inline void set_mb_mode(const str set_mb_mode_prio(priv, mb, mode, 0); } -static struct sk_buff *alloc_can_skb(struct net_device *dev, - struct can_frame **cf) -{ - struct sk_buff *skb; - - skb = netdev_alloc_skb(dev, sizeof(struct can_frame)); - if (unlikely(!skb)) - return NULL; - - skb->protocol = htons(ETH_P_CAN); - skb->ip_summed = CHECKSUM_UNNECESSARY; - *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); - - return skb; -} - -static struct sk_buff *alloc_can_err_skb(struct net_device *dev, - struct can_frame **cf) -{ - struct sk_buff *skb; - - skb = alloc_can_skb(dev, cf); - if (unlikely(!skb)) - return NULL; - - memset(*cf, 0, sizeof(struct can_frame)); - (*cf)->can_id = CAN_ERR_FLAG; - (*cf)->can_dlc = CAN_ERR_DLC; - - return skb; -} - /* * Swtich transceiver on or off */ Index: net-next-2.6/drivers/net/can/sja1000/sja1000.c =================================================================== --- net-next-2.6.orig/drivers/net/can/sja1000/sja1000.c +++ net-next-2.6/drivers/net/can/sja1000/sja1000.c @@ -296,11 +296,9 @@ static void sja1000_rx(struct net_device uint8_t dlc; int i; - skb = dev_alloc_skb(sizeof(struct can_frame)); + skb = alloc_can_skb(dev, &cf); if (skb == NULL) return; - skb->dev = dev; - skb->protocol = htons(ETH_P_CAN); fi = priv->read_reg(priv, REG_FI); dlc = fi & 0x0F; @@ -351,15 +349,9 @@ static int sja1000_err(struct net_device enum can_state state = priv->can.state; uint8_t ecc, alc; - skb = dev_alloc_skb(sizeof(struct can_frame)); + skb = alloc_can_err_skb(dev, &cf); if (skb == NULL) return -ENOMEM; - skb->dev = dev; - skb->protocol = htons(ETH_P_CAN); - cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); - memset(cf, 0, sizeof(struct can_frame)); - cf->can_id = CAN_ERR_FLAG; - cf->can_dlc = CAN_ERR_DLC; if (isrc & IRQ_DOI) { /* data overrun interrupt */ Index: net-next-2.6/drivers/net/can/usb/ems_usb.c =================================================================== --- net-next-2.6.orig/drivers/net/can/usb/ems_usb.c +++ net-next-2.6/drivers/net/can/usb/ems_usb.c @@ -311,14 +311,10 @@ static void ems_usb_rx_can_msg(struct em int i; struct net_device_stats *stats = &dev->netdev->stats; - skb = netdev_alloc_skb(dev->netdev, sizeof(struct can_frame)); + skb = alloc_can_skb(dev->netdev, &cf); if (skb == NULL) return; - skb->protocol = htons(ETH_P_CAN); - - cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); - cf->can_id = msg->msg.can_msg.id; cf->can_dlc = min_t(u8, msg->msg.can_msg.length, 8); @@ -346,18 +342,10 @@ static void ems_usb_rx_err(struct ems_us struct sk_buff *skb; struct net_device_stats *stats = &dev->netdev->stats; - skb = netdev_alloc_skb(dev->netdev, sizeof(struct can_frame)); + skb = alloc_can_err_skb(dev->netdev, &cf); if (skb == NULL) return; - skb->protocol = htons(ETH_P_CAN); - - cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); - memset(cf, 0, sizeof(struct can_frame)); - - cf->can_id = CAN_ERR_FLAG; - cf->can_dlc = CAN_ERR_DLC; - if (msg->type == CPC_MSG_TYPE_CAN_STATE) { u8 state = msg->msg.can_state; Index: net-next-2.6/drivers/net/can/ti_hecc.c =================================================================== --- net-next-2.6.orig/drivers/net/can/ti_hecc.c +++ net-next-2.6/drivers/net/can/ti_hecc.c @@ -535,18 +535,15 @@ static int ti_hecc_rx_pkt(struct ti_hecc u32 data, mbx_mask; unsigned long flags; - skb = netdev_alloc_skb(priv->ndev, sizeof(struct can_frame)); + skb = alloc_can_skb(priv->ndev, &cf); if (!skb) { if (printk_ratelimit()) dev_err(priv->ndev->dev.parent, - "ti_hecc_rx_pkt: netdev_alloc_skb() failed\n"); + "ti_hecc_rx_pkt: alloc_can_skb() failed\n"); return -ENOMEM; } - skb->protocol = __constant_htons(ETH_P_CAN); - skb->ip_summed = CHECKSUM_UNNECESSARY; mbx_mask = BIT(mbxno); - cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); data = hecc_read_mbx(priv, mbxno, HECC_CANMID); if (data & HECC_CANMID_IDE) cf->can_id = (data & CAN_EFF_MASK) | CAN_EFF_FLAG; @@ -656,19 +653,13 @@ static int ti_hecc_error(struct net_devi struct sk_buff *skb; /* propogate the error condition to the can stack */ - skb = netdev_alloc_skb(ndev, sizeof(struct can_frame)); + skb = alloc_can_err_skb(ndev, &cf); if (!skb) { if (printk_ratelimit()) dev_err(priv->ndev->dev.parent, - "ti_hecc_error: netdev_alloc_skb() failed\n"); + "ti_hecc_error: alloc_can_err_skb() failed\n"); return -ENOMEM; } - skb->protocol = __constant_htons(ETH_P_CAN); - skb->ip_summed = CHECKSUM_UNNECESSARY; - cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); - memset(cf, 0, sizeof(struct can_frame)); - cf->can_id = CAN_ERR_FLAG; - cf->can_dlc = CAN_ERR_DLC; if (int_status & HECC_CANGIF_WLIF) { /* warning level int */ if ((int_status & HECC_CANGIF_BOIF) == 0) { _______________________________________________ Socketcan-core mailing list [email protected] https://lists.berlios.de/mailman/listinfo/socketcan-core
