[PATCH] IPV6: redo stateless addrconf properly

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

Hello.

Interface that had configured via stateless addrconf did not do 
stateless addrconf again correctly after interface was down.
Forget IF_RS_SENT|IF_RA_RCVD flags when interface goes down.

Patch is against 2.6.0-test10, but similar logic applies to
2.4.x and 2.2.x.

Thanks.

===== net/ipv6/addrconf.c 1.76 vs edited =====
--- 1.76/net/ipv6/addrconf.c    Sun Nov  9 15:32:54 2003
+++ edited/net/ipv6/addrconf.c  Tue Nov 25 22:23:03 2003
@@ -1924,9 +1924,13 @@
                write_unlock_bh(&addrconf_hash_lock);
        }
 
-       /* Step 3: clear address list */
-
        write_lock_bh(&idev->lock);
+
+       /* Step 3: clear flags for stateless addrconf */
+       if (how != 1)
+               idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
+
+       /* Step 4: clear address list */
 #ifdef CONFIG_IPV6_PRIVACY
        if (how == 1 && del_timer(&idev->regen_timer))
                in6_dev_put(idev);
@@ -1962,7 +1966,7 @@
        }
        write_unlock_bh(&idev->lock);
 
-       /* Step 4: Discard multicast list */
+       /* Step 5: Discard multicast list */
 
        if (how == 1)
                ipv6_mc_destroy_dev(idev);

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