On Mon, Nov 04, 2013 at 04:36:20PM +0000, James Chapman wrote:
> Introduce an xtables add-on for matching L2TP packets. Supports L2TPv2
> and L2TPv3 over IPv4 and IPv6. As well as filtering on L2TP tunnel-id
> and session-id, the filtering decision can also include the L2TP
> packet type (control or data), protocol version (2 or 3) and
> encapsulation type (UDP or IP).
>
> The most common use for this will likely be to filter L2TP data
> packets of individual L2TP tunnels or sessions. While a u32 match can
> be used, the L2TP protocol headers are such that field offsets differ
> depending on bits set in the header, making rules for matching generic
> L2TP connections cumbersome. This match extension takes care of all
> that.
>
> +enum {
> + XT_L2TP_TID = (1 << 0), /* match L2TP tunnel id */
> + XT_L2TP_SID = (1 << 1), /* match L2TP session id */
> + XT_L2TP_VERSION = (1 << 2), /* match L2TP protocol version */
> + XT_L2TP_ENCAP = (1 << 3), /* match L2TP encapsulation type */
> + XT_L2TP_TYPE = (1 << 4), /* match L2TP packet type */
> +};
> +
> +static struct xt_match l2tp_mt_reg[] __read_mostly = {
> + {
> + .name = "l2tp",
> + .revision = 0,
> + .family = NFPROTO_IPV4,
> + .match = l2tp_mt4,
> + .matchsize = XT_ALIGN(sizeof(struct xt_l2tp_info)),
> + .hooks = ((1 << NF_INET_PRE_ROUTING) |
> + (1 << NF_INET_LOCAL_IN) |
> + (1 << NF_INET_LOCAL_OUT) |
> + (1 << NF_INET_FORWARD)),
> + .me = THIS_MODULE,
> + },
Plase add a checkentry function and verify that no unknown flags are passed
to the kernel.
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