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* flow: Make flow_table.h #include the protocol specific headers it needsDavid Gibson2024-01-221-0/+2
| | | | | | | | | | | | | | | | | | | | flow_table.h, the lower level flow header relies on having the struct definitions for every protocol specific flow type - so far that means tcp_conn.h. It doesn't include it itself, so tcp_conn.h must be included before flow_table.h. That's ok for now, but as we use the flow table for more things, flow_table.h will need the structs for all of them, which means the protocol specific .c files would need to include tcp_conn.h _and_ the equivalents for every other flow type before flow_table.h every time, which is weird. So, although we *mostly* lean towards the include style where .c files need to handle the include dependencies, in this case it makes more sense to have flow_table.h include all the protocol specific headers it needs. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* flow: Introduce 'sidx' type to represent one side of one flowDavid Gibson2023-12-041-0/+38
| | | | | | | | | | | | | | In a number of places, we use indices into the flow table to identify a specific flow. We also have cases where we need to identify a particular side of a particular flow, and we expect those to become more common as we generalise the flow table to cover more things. To assist with that, introduces flow_sidx_t, an index type which identifies a specific side of a specific flow in the table. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: Suppress false cppcheck positive in flow_sidx()] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* flow, tcp: Consolidate flow pointer<->index helpersDavid Gibson2023-12-041-0/+25
| | | | | | | | | | | | | | | | | | | Both tcp.c and tcp_splice.c define CONN_IDX() variants to find the index of their connection structures in the connection table, now become the unified flow table. We can easily combine these into a common helper. While we're there, add some trickery for some additional type safety. They also define their own CONN() versions, which aren't so easily combined since they need to return different types, but we can have them use a common helper. In the process, we standardise on always using an unsigned type to store the connection / flow index, which makes more sense. tcp.c's conn_at_idx() remains for now, but we change its parameter to unsigned to match. That in turn means we can remove a check for negative values from it. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* flow, tcp: Move TCP connection table to unified flow tableDavid Gibson2023-12-041-0/+25
We want to generalise "connection" tracking to things other than true TCP connections. Continue implenenting this by renaming the TCP connection table to the "flow table" and moving it to flow.c. The definitions are split between flow.h and flow_table.h - we need this separation to avoid circular dependencies: the definitions in flow.h will be needed by many headers using the flow mechanism, but flow_table.h needs all those protocol specific headers in order to define the full flow table entry. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>