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tcp, udp: Don't pre-fill IPv4 destination address in headers

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Because packets sent on the tap interface will always be going to the
guest/namespace, we more-or-less know what address they'll be going to.  So
we pre-fill this destination address in our header buffers for IPv4.  We
can't do the same for IPv6 because we could need either the global or
link-local address for the guest.  In future we're going to want more
flexibility for the destination address, so this pre-filling will get in
the way.

Change the flow so we always fill in the IPv4 destination address for each
packet, rather than prefilling it from proto_update_l2_buf().  In fact for
TCP we already redundantly filled the destination for each packet anyway.

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 2023-08-22 15:29:57 +10:00 • committed by Stefano Brivio
parent 5bf200ae8a
commit 955dd3251c
8 changed files with 15 additions and 32 deletions

4
passt.h
View file

@ -303,7 +303,7 @@ struct ctx {
int low_rmem;
};
void proto_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s,
const struct in_addr *ip_da);
void proto_update_l2_buf(const unsigned char *eth_d,
const unsigned char *eth_s);
#endif /* PASST_H */