1. 10 10月, 2007 28 次提交
  2. 09 10月, 2007 10 次提交
  3. 08 10月, 2007 2 次提交
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      [IPv6]: Fix ICMPv6 redirect handling with target multicast address · bf0b48df
      Brian Haley 提交于
      When the ICMPv6 Target address is multicast, Linux processes the 
      redirect instead of dropping it.  The problem is in this code in 
      ndisc_redirect_rcv():
      
               if (ipv6_addr_equal(dest, target)) {
                       on_link = 1;
               } else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) {
                       ND_PRINTK2(KERN_WARNING
                                  "ICMPv6 Redirect: target address is not 
      link-local.\n");
                       return;
               }
      
      This second check will succeed if the Target address is, for example, 
      FF02::1 because it has link-local scope.  Instead, it should be checking 
      if it's a unicast link-local address, as stated in RFC 2461/4861 Section 
      8.1:
      
             - The ICMP Target Address is either a link-local address (when
               redirected to a router) or the same as the ICMP Destination
               Address (when redirected to the on-link destination).
      
      I know this doesn't explicitly say unicast link-local address, but it's 
      implied.
      
      This bug is preventing Linux kernels from achieving IPv6 Logo Phase II 
      certification because of a recent error that was found in the TAHI test 
      suite - Neighbor Disovery suite test 206 (v6LC.2.3.6_G) had the 
      multicast address in the Destination field instead of Target field, so 
      we were passing the test.  This won't be the case anymore.
      
      The patch below fixes this problem, and also fixes ndisc_send_redirect() 
      to not send an invalid redirect with a multicast address in the Target 
      field.  I re-ran the TAHI Neighbor Discovery section to make sure Linux 
      passes all 245 tests now.
      Signed-off-by: NBrian Haley <brian.haley@hp.com>
      Acked-by: NDavid L Stevens <dlstevens@us.ibm.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      bf0b48df
    • S