On Thu, 2009-11-12 at 23:31 -0500, William Allen Simpson wrote:
quoted text
> Define sysctl (tcp_cookie_size) to turn on and off the cookie option
> default globally, instead of a compiled configuration option.
[]

quoted text
> +#define TCP_COOKIE_MIN		 8		/*  64-bits */
> +#define TCP_COOKIE_MAX		16		/* 128-bits */

perhaps something like:

static const int TCP_COOKIE_MIN = 8;
static const int TCP_COOKIE_MAX = 16;

[]

quoted text
> --- a/net/ipv4/sysctl_net_ipv4.c
> +++ b/net/ipv4/sysctl_net_ipv4.c
> @@ -714,6 +714,14 @@ static struct ctl_table ipv4_table[] = {
>  	},
>  	{
>  		.ctl_name	= CTL_UNNUMBERED,
> +		.procname	= "tcp_cookie_size",
> +		.data		= &sysctl_tcp_cookie_size,
> +		.maxlen		= sizeof(int),
> +		.mode		= 0644,
> +		.proc_handler	= proc_dointvec

with proc_dointvec_minmax

		.extra1		= &TCP_COOKIE_MIN,
		.extra2		= &TCP_COOKIE_MAX,

or even adding proc_dointvec_minmax_even
might save some cycles during cookie handling.


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