On Mon, 2009-09-21 at 14:00 -0400, Brian Haley wrote:
> Balazs Scheidler wrote:
> > #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
> > +
> > +static inline const struct in6_addr *
> > +tproxy_laddr6(struct sk_buff *skb, const struct in6_addr *user_laddr, const struct in6_addr *daddr)
> > +{
> > + struct inet6_dev *indev;
> > + struct inet6_ifaddr *ifa;
> > + struct in6_addr *laddr;
> > +
> > + if (!ipv6_addr_any(user_laddr))
> > + return user_laddr;
> > +
> > + laddr = NULL;
> > + rcu_read_lock();
> > + indev = __in6_dev_get(skb->dev);
> > + if (indev && (ifa = indev->addr_list)) {
> > + laddr = &ifa->addr;
> > + }
> > + rcu_read_unlock();
> > +
> > + return laddr ? laddr : daddr;
> > +}
>
> You should call ipv6_dev_get_saddr() to get a source address based on the target
> destination address.
Thanks for this hint, however this is not selecting a source address for
a given destination, rather it selects the address where tproxy is
redirecting the connection in case the user specified no --on-ip
parameter.
e.g.
ip6tables -A PREROUTING -p tcp --dport 80 -j TPROXY --on-port 50080
This should redirect the connection to the primary IP address of the
incoming interface. In fact I spent 2 hours to figure out how to find
the proper address, and at the end I used the first IP address
configured to the interface, seeing that those addresses are sorted in
'scope' order, e.g. link-local and site-local addresses are at the end
of the list, thus the front should be ok.
Since I'm not that much into IPv6, I'd appreciate some help, is
ipv6_dev_get_saddr(client_ip_address) indeed the best solution here?
--
Bazsi
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