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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

1
tcp_internal.h
View file

@ -42,6 +42,7 @@
#define TAPSIDE(conn_) ((conn_)->f.pif[1] == PIF_TAP)
#define TAPFLOW(conn_) (&((conn_)->f.side[TAPSIDE(conn_)]))
#define TAP_SIDX(conn_) (FLOW_SIDX((conn_), TAPSIDE(conn_)))
#define CONN_V4(conn) (!!inany_v4(&TAPFLOW(conn)->faddr))
#define CONN_V6(conn) (!CONN_V4(conn))