On Wed, 16 Nov 2022 15:42:08 +1100 David Gibson <david(a)gibson.dropbear.id.au> wrote:For non-spliced connections we now treat IPv4-mapped IPv6 addresses the same as the corresponding IPv4 addresses. However currently we won't splice a connection from ::ffff:127.0.0.1 the way we would one from 127.0.0.1. Correct this so that we can splice connections from IPv4 localhost that have been received on an IPv6 dual stack socket. Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au> --- tcp_splice.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/tcp_splice.c b/tcp_splice.c index 7c2f667..61c56be 100644 --- a/tcp_splice.c +++ b/tcp_splice.c @@ -514,19 +514,23 @@ bool tcp_splice_conn_from_sock(struct ctx *c, union epoll_ref ref, struct tcp_splice_conn *conn, int s, const struct sockaddr *sa) { + union inany_addr aany; + const struct in_addr *a4;The usual order.+ in_port_t port;Is the port actually needed here? I don't see how you use it.+ assert(c->mode == MODE_PASTA); - if (sa->sa_family == AF_INET6) { - const struct sockaddr_in6 *sa6 - = (const struct sockaddr_in6 *)sa; - if (!IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr)) + inany_from_sockaddr(&aany, &port, sa); + a4 = inany_v4(&aany); + + if (a4) { + if (!IN4_IS_ADDR_LOOPBACK(a4)) return false; - conn->flags = SPLICE_V6; + conn->flags = 0; } else { - const struct sockaddr_in *sa4 = (const struct sockaddr_in *)sa; - if (!IN4_IS_ADDR_LOOPBACK(&sa4->sin_addr)) + if (!IN6_IS_ADDR_LOOPBACK(&aany.a6)) return false; - conn->flags = 0; + conn->flags = SPLICE_V6; } if (setsockopt(s, SOL_TCP, TCP_QUICKACK, &((int){ 1 }),-- Stefano