Hello, all
I need to add some control functions for trasit TCP sessions. Could you
please help me to determine the correct way to implement such feature? At
now I plan to write the VPP node wich will push all of transit TCP
connections into the sessions main table in following manner:
tcon0 = session_lookup_connection4(fib_index0,
> &ip40->src_address, &ip40->dst_address,
> tcp0->src_port, tcp0->dst_port, TRANSPORT_PROTO_TCP);
> if (tcon0 == 0) {
> // Allocate fake session and connection
> pool_get (mm->sess_main->sessions[0], s0);
> memset (s0, 0, sizeof (*s0));
> s0->session_index = s0 - mm->sm_main->sessions[0];
> pool_get (mm->tcp_main->connections[0], tc0);
> memset (tc0, 0, sizeof (*tc0));
> tc0->connection.c_index = tc0 - mm->tcp_main->connections[0];
> tc0->connection.s_index = s0->session_index;
> s0->connection_index = tc0->connection.c_index;
> s0->thread_index = thread_index;
>
> tc0->connection.lcl_ip.ip4.as_u32 = ip40->src_address.as_u32;
> tc0->connection.rmt_ip.ip4.as_u32 = ip40->dst_address.as_u32;
> tc0->connection.proto = TRANSPORT_PROTO_TCP;
> tc0->connection.is_ip4 = 1;
> tc0->connection.fib_index = fib_index0;
> tc0->connection.thread_index = thread_index;
> tc0->connection.lcl_port = tcp0->src_port;
> tc0->connection.rmt_port = tcp0->dst_port;
> tcon0 = &_tcon0;
> clib_memcpy (tcon0, &tc0->connection, sizeof (*tcon0));
> } else {
> tc0 = tcp_get_connection_from_transport(tcon0);
> s0 = session_get(tcon0->s_index, thread_index);
> }
> session_lookup_add_connection (tcon0, session_handle(s0));
>
Is this the correct way?
Thank you in advance,
Aleksander
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