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tcp: Obtain guest address from flowside

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Currently we always deliver inbound TCP packets to the guest's most
recent observed IP address.  This has the odd side effect that if the
guest changes its IP address with active TCP connections we might
deliver packets from old connections to the new address.  That won't
work; it will probably result in an RST from the guest.  Worse, if the
guest added a new address but also retains the old one, then we could
break those old connections by redirecting them to the new address.

Now that we maintain flowside information, we have a record of the correct
guest side address and can just use it.

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 15:26:30 +10:00 • committed by Stefano Brivio
parent f9fe212b1f
commit 52d45f1737
3 changed files with 17 additions and 33 deletions

3
tcp_internal.h
View file

@ -88,8 +88,7 @@ void tcp_rst_do(struct ctx *c, struct tcp_tap_conn *conn);
tcp_rst_do(c, conn); \
} while (0)
size_t tcp_l2_buf_fill_headers(const struct ctx *c,
const struct tcp_tap_conn *conn,
size_t tcp_l2_buf_fill_headers(const struct tcp_tap_conn *conn,
struct iovec *iov, size_t dlen,
const uint16_t *check, uint32_t seq);
int tcp_update_seqack_wnd(const struct ctx *c, struct tcp_tap_conn *conn,