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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
parent 163a339214
commit acca4235c4
5 changed files with 172 additions and 145 deletions

11
flow.h
View file

@ -164,10 +164,6 @@ static inline bool flowside_eq(const struct flowside *left,
left->fport == right->fport;
}
void flowside_from_af(struct flowside *side, sa_family_t af,
const void *eaddr, in_port_t eport,
const void *faddr, in_port_t fport);
/**
* struct flow_common - Common fields for packet flows
* @state: State of the flow table entry
@ -233,6 +229,13 @@ static inline bool flow_sidx_eq(flow_sidx_t a, flow_sidx_t b)
return (a.flowi == b.flowi) && (a.sidei == b.sidei);
}
void flow_hash_insert(const struct ctx *c, flow_sidx_t sidx);
void flow_hash_remove(const struct ctx *c, flow_sidx_t sidx);
flow_sidx_t flow_lookup_af(const struct ctx *c,
uint8_t proto, uint8_t pif, sa_family_t af,
const void *eaddr, const void *faddr,
in_port_t eport, in_port_t fport);
union flow;
void flow_init(void);