On 2016/03/24 20:27, Sebastien Marie wrote:
> Hi,
>
> I encountered a problem with IPv6 connectivity after upgrade to snapshot
> Mar 23 on my amd64 router.
>
> The router use a pppoe session to get IPv4 and IPv6. I had to made a
> DHCP-ND request to get routable IPv6, and I use dhcpcd from ports for
> that.
>
> The IPv4 is ok, but for IPv6, dhcpcd has the following error:
>
> Mar 24 20:16:33 alf dhcpcd[43667]: DUID 00:01:00:01:1e:40:7c:6c
> Mar 24 20:16:33 alf dhcpcd[43667]: pppoe0: IAID 00:00:00:01
> Mar 24 20:16:33 alf dhcpcd[43667]: pppoe0: IAID 00:00:00:02
> Mar 24 20:16:33 alf dhcpcd[43667]: pppoe0: rebinding prior DHCPv6 lease
> Mar 24 20:16:35 alf dhcpcd[43667]: pppoe0: dhcp6_sendmessage: sendmsg:
> Invalid argument
> Mar 24 20:17:03 alf dhcpcd[43667]: timed out
> Mar 24 20:17:03 alf dhcpcd[43667]: forked to background, child pid 10317
This is due to the new in6_pcbaddrisavail() check in udp6_output.c
(that is also in the 5.9 errata). This will work-around it for now:
Index: udp6_output.c
===================================================================
RCS file: /cvs/src/sys/netinet6/udp6_output.c,v
retrieving revision 1.46
diff -u -p -r1.46 udp6_output.c
--- udp6_output.c 23 Mar 2016 15:50:36 -0000 1.46
+++ udp6_output.c 29 Mar 2016 10:24:34 -0000
@@ -175,7 +175,7 @@ udp6_output(struct inpcb *in6p, struct m
valid.sin6_len = sizeof(valid);
error = in6_pcbaddrisavail(in6p, &valid, 0, p);
if (error)
- goto release;
+ printf("udp6_output: in6_pcbaddrisavail\n");
}
} else {
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->inp_faddr6)) {
(or just remove it).
> I had ktraced it for grabing the sendmsg syscall arguments used:
>
> 43667 dhcpcd CALL sendmsg(10,0x1abbb5052020,0)
> 43667 dhcpcd STRU struct msghdr { name=0x7f7ffffc5260, namelen=28,
> iov=0x1abbb5052050, iovlen=1, control=0x1abbb5052070, controllen=40, flags=0 }
> 43667 dhcpcd STRU struct iovec { base=0x1abb901b5000, len=167 }
> 43667 dhcpcd STRU struct sockaddr { AF_INET6, [ff02::1:2]:547 }
> 43667 dhcpcd STRU struct cmsghdr { len=36, level=41<ipv6>, type=46 }
> 43667 dhcpcd RET sendmsg -1 errno 22 Invalid argument
With this check disabled/neutered, the packets are sent like so:
11:26:43.567469 PPPoE
code Session, version 1, type 1, id 0x02db, length 213
IPV6: fe80::225:90ff:fec0:77b5.546 > ff02::1:2.547: [udp sum ok]dhcp6
reconfig [hlim 1] (len 171)
11:26:43.581748 PPPoE
code Session, version 1, type 1, id 0x02db, length 155
IPV6: fe80::d2f0:dbff:fe6c:e000.547 > fe80::225:90ff:fec0:77b5.546:
[udp sum ok]dhcp6 [class 0xc0] (len 113, hlim 64)
$ fstat | grep 546
root dhcpcd 1384 10* internet6 dgram udp *:546
As you'd expect, fe80::225:90ff:fec0:77b5 is the link-local address
on the pppoe interface.
