On Mon, 2011-04-18 at 08:29 +0200, Richard Cochran wrote:
> This patch adds a driver for the hardware time stamping unit found on the
> IXP465. The basic clock operations and an external trigger are implemented.
[...]
> --- a/drivers/net/arm/ixp4xx_eth.c
> +++ b/drivers/net/arm/ixp4xx_eth.c
[...]
> @@ -246,6 +255,169 @@ static int ports_open;
> static struct port *npe_port_tab[MAX_NPES];
> static struct dma_pool *dma_pool;
>
> +static struct sock_filter ptp_filter[] = {
> + PTP_FILTER
> +};
> +
> +static int ixp_ptp_match(struct sk_buff *skb, u16 uid_hi, u32 uid_lo, u16 seq)
> +{
> + unsigned int type;
> + u16 *hi, *id;
> + u8 *lo, *data = skb->data;
> +
> + type = sk_run_filter(skb, ptp_filter);
> +
> + if (PTP_CLASS_V1_IPV4 == type) {
> +
> + id = (u16 *)(data + 42 + 30);
> + hi = (u16 *)(data + 42 + 22);
> + lo = data + 42 + 24;
[...]
PTP_FILTER does not verify that the packet length is sufficient to hold
a complete PTP header, nor does it require that the IPv4 header length
is 5 (i.e. 20 bytes). So you have to check those here rather than using
magic numbers.
I think you also need to use be16_to_cpup() to read 'id' and 'hi', since
the host byte order may vary.
Ben.
--
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
--
To unsubscribe from this list: send the line "unsubscribe linux-api" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
