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flow, tcp: Generalise TCP hash table to general flow hash table

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Move the data structures and helper functions for the TCP hash table to
flow.c, making it a general hash table indexing sides of flows.  This is
largely code motion and straightforward renames.  There are two semantic
changes:

 * flow_lookup_af() now needs to verify that the entry has a matching
   protocol and interface as well as matching addresses and ports.

 * We double the size of the hash table, because it's now at least
   theoretically possible for both sides of each flow to be hashed.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-07-18 15:26:35 +10:00 • committed by Stefano Brivio
commit acca4235c4
5 changed files with 172 additions and 145 deletions

3
flow_table.h
View file

@ -146,7 +146,4 @@ void flow_activate(struct flow_common *f);
#define FLOW_ACTIVATE(flow_) \
(flow_activate(&(flow_)->f))
uint64_t flow_hash(const struct ctx *c, uint8_t proto, uint8_t pif,
const struct flowside *side);
#endif /* FLOW_TABLE_H */