On 02/01/18(Tue) 20:44, Darren Tucker wrote:
> I rearranged my network and ended up getting these in messages:
>
> cannot forward src fe80:9::a691:b1ff:fe1f:d2a0, dst
> 2001:44b8:3110:fb00:200:5eff:fe00:10a, nxt 58, rcvif 9, outif 1
>
> I guess I could run ifconfig and count interfaces, but I'm lazy and the
> kernel knows what they are.
No need to count, just look at the 'index' output in ifconfig(8).
> cannot forward src fe80:9::a691:b1ff:fe1f:d2a0, dst
> 2001:44b8:3110:fb00:200:5eff:fe00:10a, nxt 58, rcvif carp0, outif em0
>
> ok? (caveat: kernel n00b, don't assume I know what I'm doing)
>
> Index: netinet6/ip6_forward.c
> ===================================================================
> RCS file: /cvs/src/sys/netinet6/ip6_forward.c,v
> retrieving revision 1.95
> diff -u -p -r1.95 ip6_forward.c
> --- netinet6/ip6_forward.c 30 Jun 2017 11:29:15 -0000 1.95
> +++ netinet6/ip6_forward.c 2 Jan 2018 08:44:38 -0000
> @@ -86,7 +86,7 @@ ip6_forward(struct mbuf *m, struct rtent
> {
> struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
> struct sockaddr_in6 *dst, sin6;
> - struct ifnet *ifp = NULL;
> + struct ifnet *ifp = NULL, *ifp_dst = NULL;
> int error = 0, type = 0, code = 0;
> struct mbuf *mcopy = NULL;
> #ifdef IPSEC
> @@ -197,12 +197,27 @@ reroute:
> ip6_log_time = time_uptime;
> inet_ntop(AF_INET6, &ip6->ip6_src, src6, sizeof(src6));
> inet_ntop(AF_INET6, &ip6->ip6_dst, dst6, sizeof(dst6));
> - log(LOG_DEBUG,
> - "cannot forward "
> - "src %s, dst %s, nxt %d, rcvif %u, outif %u\n",
> - src6, dst6,
> - ip6->ip6_nxt,
> - m->m_pkthdr.ph_ifidx, rt->rt_ifidx);
> + ifp = if_get(m->m_pkthdr.ph_ifidx);
> + ifp_dst = if_get(rt->rt_ifidx);
> + if (ifp != NULL && ifp_dst != NULL) {
> + log(LOG_DEBUG,
> + "cannot forward src %s, dst %s, "
> + "nxt %d, rcvif %s, outif %s\n",
> + src6, dst6,
> + ip6->ip6_nxt,
> + ifp->if_xname, ifp_dst->if_xname);
> + } else {
> + log(LOG_DEBUG,
> + "cannot forward src %s, dst %s, "
> + "nxt %d, rcvif %u, outif %u\n",
> + src6, dst6,
> + ip6->ip6_nxt,
> + m->m_pkthdr.ph_ifidx, rt->rt_ifidx);
> + }
> + if_put(ifp_dst);
> + ifp_dst = NULL;
> + if_put(ifp);
> + ifp = NULL;
> }
> if (mcopy)
> icmp6_error(mcopy, ICMP6_DST_UNREACH,
>
> --
> Darren Tucker (dtucker at dtucker.net)
> GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860 37F4 9357 ECEF 11EA A6FA (new)
> Good judgement comes with experience. Unfortunately, the experience
> usually comes from bad judgement.
>
