[PATCH/RFC] IPV6: Remember Manage/OtherConfig flags

[YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@xxxxxxxxxxxxxx>]

Hello.

Well, I reread the spec.

Managed flag and OtherConfig flag are maintained on a per-interface 
basis (RFC2462 5.2).

So, let's store them in inet6_dev{}.

Well, I haven't done kernel/userspace API for this;
We should do it via rtnetlink with IFLA_IF6INFO (struct ifla_if6info {
u32 ifla_if6flags; }) or something like this.
(Note: if_flags is type of u8, but It would be good to reserve 24bits for 
future extensions.)

If this idea seems ok, any voluteers? 
(I don't have enough time for writing this for now.)

Thanks.

Index: linux-2.5/include/net/if_inet6.h
===================================================================
RCS file: /home/cvs/linux-2.5/include/net/if_inet6.h,v
retrieving revision 1.8
diff -u -r1.8 if_inet6.h
--- linux-2.5/include/net/if_inet6.h    16 May 2003 00:25:11 -0000      1.8
+++ linux-2.5/include/net/if_inet6.h    11 Jun 2003 05:40:20 -0000
@@ -17,6 +17,9 @@
 
 #include <net/snmp.h>
 
+/* inet6_dev.if_flags */
+#define IF_RA_OTHERCONF        0x80    /* Managed flag in RA */
+#define IF_RA_MANAGED  0x40    /* OtherConfig flag in RA */
 #define IF_RA_RCVD     0x20
 #define IF_RS_SENT     0x10
 
Index: linux-2.5/net/ipv6/ndisc.c
===================================================================
RCS file: /home/cvs/linux-2.5/net/ipv6/ndisc.c,v
retrieving revision 1.38
diff -u -r1.38 ndisc.c
--- linux-2.5/net/ipv6/ndisc.c  7 Jun 2003 00:22:34 -0000       1.38
+++ linux-2.5/net/ipv6/ndisc.c  11 Jun 2003 05:40:20 -0000
@@ -1043,6 +1043,14 @@
                in6_dev->if_flags |= IF_RA_RCVD;
        }
 
+       /*
+        * Remember the managed / otherconf flags from the most recently
+        * received RA message (RFC2462) -- yoshfuji
+        */
+       in6_dev->if_flags = (in6_dev->if_flags & 
~(IF_RA_MANAGED|IF_RA_OTHERCONF)) |
+                           (ra_msg->icmph.icmp6_addrconf_managed ? 
IF_RA_MANAGED : 0) |
+                           (ra_msg->icmph.icmp6_addrconf_other ? 
IF_RA_OTHERCONF : 0);
+
        lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
 
        rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);

-- 
Hideaki YOSHIFUJI @ USAGI Project <yoshfuji@xxxxxxxxxxxxxx>
GPG FP: 9022 65EB 1ECF 3AD1 0BDF  80D8 4807 F894 E062 0EEA