At the moment transport mode processing is not dependent on skb->dst
being passed. Tunnel mode derives the ip->id and ttl from it. More like
computes ip->id.
I am trying to generate traffic via pktgen and it would be nice if i
could get the same behavior on tunnel mode as in transport mode. I dont
think it matters what the values of those two fields are.
Would it be reasonable to do a check so that incase a skb->dst doesnt
exist, the inner headers values can be used i.e something along
xfrm4_tunnel_output()::
----
top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
0 : (iph->frag_off & htons(IP_DF));
if (dst) {
if (!top_iph->frag_off)
__ip_select_ident(top_iph, dst->child, 0);
top_iph->ttl = dst_metric(dst->child, RTAX_HOPLIMIT);
} else {
top_iph->id = iph->id;
top_iph->ttl = iph->ttl;
}
----
cheers,
jamal
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