netdev - Re: [PATCH iproute2] ip: link_gre6.c: Support IP6_TNL_F_ALLOW_LOCAL

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Message-ID: <a868b3df-863f-7c0a-424b-f097c79b8d41@gmail.com>
Date:   Tue, 20 Feb 2018 22:15:05 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     Petr Machata <petrm@...lanox.com>, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] ip: link_gre6.c: Support
 IP6_TNL_F_ALLOW_LOCAL_REMOTE flag

Petr Machata wrote:
> For IP-in-IP tunnels, one can specify the [no]allow-localremote command
> when configuring a device. Under the hood, this flips the
> IP6_TNL_F_ALLOW_LOCAL_REMOTE flag on the netdevice. However, ip6gretap
> and ip6erspan devices, where the flag is also relevant, are not IP-in-IP
> tunnels, and thus there's no way to configure the flag on these
> netdevices. Therefore introduce the command to link_gre6 as well.
> 
> The original support was introduced in commit
> 21440d19d957 ("ip: link_ip6tnl.c/ip6tunnel.c: Support IP6_TNL_F_ALLOW_LOCAL_REMOTE flag")

Maybe it is better to rebase this against iproute2-next?

There are lot of changes already done here and there are plans on ip and
ipv6 tunnel modules variants merge.

> 
> Signed-off-by: Petr Machata <petrm@...lanox.com>
> ---
>  ip/link_gre6.c        | 11 +++++++++++
>  man/man8/ip-link.8.in | 14 ++++++++++++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/ip/link_gre6.c b/ip/link_gre6.c
> index 4045f65..4c05344 100644
> --- a/ip/link_gre6.c
> +++ b/ip/link_gre6.c
> @@ -44,6 +44,7 @@ static void print_usage(FILE *f)
>  		"                                  [ flowlabel FLOWLABEL ]\n"
>  		"                                  [ dscp inherit ]\n"
>  		"                                  [ fwmark MARK ]\n"
> +		"                                  [ [no]allow-localremote ]\n"
>  		"                                  [ dev PHYS_DEV ]\n"
>  		"                                  [ noencap ]\n"
>  		"                                  [ encap { fou | gue | none } ]\n"
> @@ -348,6 +349,10 @@ get_failed:
>  					invarg("invalid fwmark\n", *argv);
>  				flags &= ~IP6_TNL_F_USE_ORIG_FWMARK;
>  			}
> +		} else if (strcmp(*argv, "allow-localremote") == 0) {
> +			flags |= IP6_TNL_F_ALLOW_LOCAL_REMOTE;
> +		} else if (strcmp(*argv, "noallow-localremote") == 0) {
> +			flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE;
>  		} else if (strcmp(*argv, "encaplimit") == 0) {
>  			NEXT_ARG();
>  			if (strcmp(*argv, "none") == 0) {
> @@ -534,6 +539,12 @@ static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
>  	if (oflags & GRE_CSUM)
>  		print_bool(PRINT_ANY, "ocsum", "ocsum ", true);
>  
> +	if (flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE)
> +		print_bool(PRINT_ANY,
> +			   "ip6_tnl_f_allow_local_remote",
> +			   "allow-localremote ",
> +			   true);
> +
>  	if (flags & IP6_TNL_F_USE_ORIG_FWMARK) {
>  		print_bool(PRINT_ANY,
>  			   "ip6_tnl_f_use_orig_fwmark",
> diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
> index 481589e..5dee9fc 100644
> --- a/man/man8/ip-link.8.in
> +++ b/man/man8/ip-link.8.in
> @@ -793,6 +793,8 @@ the following additional arguments are supported:
>  ] [
>  .BI "dscp inherit"
>  ] [
> +.BI "[no]allow-localremote"
> +] [
>  .BI dev " PHYS_DEV "
>  ] [
>  .RB external
> @@ -857,6 +859,11 @@ flag is equivalent to the combination
>  - specifies a fixed flowlabel.
>  
>  .sp
> +.BI  [no]allow-localremote
> +- specifies whether to allow remote endpoint to have an address configured on
> +local host.
> +
> +.sp
>  .BI  tclass " TCLASS"
>  - specifies the traffic class field on
>  tunneled packets, which can be specified as either a two-digit
> @@ -927,6 +934,8 @@ the following additional arguments are supported:
>  ] [
>  .BR erspan_hwid " \fIhwid "
>  ] [
> +.BI "[no]allow-localremote"
> +] [
>  .RB external
>  ]
>  
> @@ -965,6 +974,11 @@ traffic's source port and direction.
>  is a 6-bit value for users to configure.
>  
>  .sp
> +.BI  [no]allow-localremote
> +- specifies whether to allow remote endpoint to have an address configured on
> +local host.
> +
> +.sp
>  .BR external
>  - make this tunnel externally controlled (or not, which is the default).
>  In the kernel, this is referred to as collect metadata mode.  This flag is
> 




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