Fernando Fernandez Mancera <ffmanc...@riseup.net> wrote:
> > ERROR: "ipv4_synproxy_hook" [net/ipv6/netfilter/ip6t_SYNPROXY.ko] undefined!
> >    ERROR: "synproxy_send_client_synack_ipv6" 
> > [net/ipv6/netfilter/ip6t_SYNPROXY.ko] undefined!
> >    ERROR: "synproxy_recv_client_ack_ipv6" 
> > [net/ipv6/netfilter/ip6t_SYNPROXY.ko] undefined!
> >    ERROR: "nf_synproxy_ipv6_init" [net/ipv6/netfilter/ip6t_SYNPROXY.ko] 
> > undefined!
> >    ERROR: "nf_synproxy_ipv6_fini" [net/ipv6/netfilter/ip6t_SYNPROXY.ko] 
> > undefined!
> >    ERROR: "ipv4_synproxy_hook" [net/ipv4/netfilter/ipt_SYNPROXY.ko] 
> > undefined!
> >    ERROR: "synproxy_send_client_synack" 
> > [net/ipv4/netfilter/ipt_SYNPROXY.ko] undefined!
> >    ERROR: "synproxy_recv_client_ack" [net/ipv4/netfilter/ipt_SYNPROXY.ko] 
> > undefined!
> >    ERROR: "nf_synproxy_ipv4_init" [net/ipv4/netfilter/ipt_SYNPROXY.ko] 
> > undefined!
> >    ERROR: "nf_synproxy_ipv4_fini" [net/ipv4/netfilter/ipt_SYNPROXY.ko] 
> > undefined!
> 
> Why undefined? I have exported them with EXPORT_SYMBOL_GPL(). What am I
> missing? Thanks!

The only cases I can think of are these:

a) synproxy_send_client_synack_ipv6 etc. is not exported
b) synproxy_send_client_synack_ipv6 are exported, but not built
   (usually points to a dependency bug).
c) synproxy_send_client_synack_ipv6 are in a module, but foo.o is builtin

Above errors would hint at b). You can check the .config if thats the
case or not.

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