ip: link_gre6.c: Support IP6_TNL_F_ALLOW_LOCAL_REMOTE flag

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")

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David Ahern <dsahern@gmail.com>

diff --git a/ip/link_gre6.c b/ip/link_gre6.c
index 6c77038a65b91a94fcb16edd088c8cef9b102e02..e0746bc3cd5127fd62d808dac259636c24d4f430 100644 (file)
--- a/ip/link_gre6.c
+++ b/ip/link_gre6.c
@@ -48,6 +48,7 @@ static void gre_print_help(struct link_util *lu, int argc, char **argv, FILE *f)
                "                     [ dscp inherit ]\n"
                "                     [ dev PHYS_DEV ]\n"
                "                     [ fwmark MARK ]\n"
+               "                     [ [no]allow-localremote ]\n"
                "                     [ external ]\n"
                "                     [ noencap ]\n"
                "                     [ encap { fou | gue | none } ]\n"
@@ -346,6 +347,10 @@ 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 481589ea368ad7e25dbaaa74cdf1b471289cb205..5dee9fcd627a2a7eab6cf8c860ca674baa0a9606 100644 (file)
--- 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
@@ -856,6 +858,11 @@ flag is equivalent to the combination
 .BI  flowlabel " FLOWLABEL"
 - 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
@@ -927,6 +934,8 @@ the following additional arguments are supported:
 ] [
 .BR erspan_hwid " \fIhwid "
 ] [
+.BI "[no]allow-localremote"
+] [
 .RB external
 ]
 
@@ -964,6 +973,11 @@ traffic's source port and direction.
 .IR hwid
 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).