Fernando Fernandez Mancera <ffmanc...@riseup.net> wrote:
> Added nf_osf_ttl() and nf_osf_match() into nf_osf.c in order to start
> the nftables OSF implementation.

> diff --git a/include/uapi/linux/netfilter/nf_osf.h 
> b/include/uapi/linux/netfilter/nf_osf.h
> new file mode 100644
> index 000000000000..76016b0066f5
> --- /dev/null
> +++ b/include/uapi/linux/netfilter/nf_osf.h
> +bool nf_osf_match(const struct sk_buff *skb, u_int8_t family,
> +            int hooknum, struct net_device *in, struct net_device *out,
> +            const struct xt_osf_info *info, struct net *net);

No need to expose this in UAPI header, this would be an inkernel
helper function.

> diff --git a/include/uapi/linux/netfilter/xt_osf.h 
> b/include/uapi/linux/netfilter/xt_osf.h
> index dad197e2ab99..262ad1607bcf 100644
> --- a/include/uapi/linux/netfilter/xt_osf.h
> +++ b/include/uapi/linux/netfilter/xt_osf.h
> @@ -24,100 +24,10 @@
>  #include <linux/ip.h>
>  #include <linux/tcp.h>
>  
> -#define MAXGENRELEN          32
> -
>  #define XT_OSF_GENRE         (1<<0)
> -#define      XT_OSF_TTL              (1<<1)
> -#define XT_OSF_LOG           (1<<2)
>  #define XT_OSF_INVERT                (1<<3)

This removes userspace-exposed values from the header so
this breaks uapi.

Just leave this file alone.

> +config NFT_OSF
> +    tristate '"osf" Passive OS fingerprint match'
> +     depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
> +     help
> +       This option selects the Passive OS Fingerprinting match module
> +       that allows to passively match the remote operating system by
> +       analyzing incoming TCP SYN packets.
> +
> +       Rules and loading software can be downloaded from
> +       http://www.ioremap.net/projects/osf
> +
> +       To compile it as a module, choose M here.  If unsure, say N.

This says NFT_OSF, yet it controls nf_osf.c which looks like the
backend.

So this should be "config NF_OSF" and have no help text, then make
XT_OSF "select" the NF_OSF knob.

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