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Subjectudp <-> tcp connect
Hi All!

I want to bind to non-local IP and send/receive UDP packets.

But when I try to connect to remote end I get an error (although bind itself
is successful).

I examined the udp_connect and tcp_v4_connect and I found an
interesting difference between them.

In udp_connect:
err = ip_route_connect(&rt, usin->sin_addr.s_addr, sk->saddr,
sk->ip_tos|sk->localroute, sk->bound_dev_if);
^^^^^^^^^^^
(1)

but in tcp_v4_connect:
tmp = ip_route_connect(&rt, nexthop, sk->saddr,
RT_TOS(sk->ip_tos)|RTO_CONN|sk->localroute, sk->bound_dev_if);
^^^^^^^^^^^^^^^^^^^^^^^^^^^
(2)

If I see it right, this difference is used only in the ip_route_output_slow
function when it checks whether I can connect or not.

The question is whether there will be any problem if I rewrite (1) to (2)? I
tried doing this and seems to work fine.

Is there any reason not to do this?

Any help is appreciated.

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