[Bug 253005] Received IPv6 RA message with plen !=64 in PIO is not processed.

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Mon Jan 25 21:30:52 UTC 2021


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253005

            Bug ID: 253005
           Summary: Received IPv6 RA message with plen !=64 in PIO is not
                    processed.
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dmytro at shytyi.net

Overview:

Received IPv6 prefix via Prefix Information Option in RA message is not
processed (Even when presented code seems to have this ability).
There is function "in6_ifadd()" referenced in the: source/netinet6/nd6_rtr.c
Line: 1624
This function seems to allow configuration of the prefix and IID with length
!=64.
The code responsible for setting prefix and IID with length !=64 is presented
inline and below: source/netinet6/nd6_rtr.c Lines: 2233-2244

Actual Results:
When FreeBSD receives an RA message with prefix len == 80, no ipv6 address with
plen = 80 is autoconfigured on the interfaces.

Expected Results: 
Ipv6 address with plen == 80 autoconfigured on the interfaces.

Code:
 2232         /* make ifaddr */
 2233         in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask);
 2234 
 2235         IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask);
 2236         /* interface ID */
 2237         ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
 2238             (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
 2239         ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
 2240             (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
 2241         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 2242             (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
 2243         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 2244             (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);

-- 
You are receiving this mail because:
You are the assignee for the bug.


More information about the freebsd-bugs mailing list