1/*	$NetBSD: in6_offload.h,v 1.11 2019/08/05 10:25:41 christos Exp $	*/
2
3/*
4 * Copyright (c)2005, 2006 YAMAMOTO Takashi,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#if !defined(_NETINET6_IN6_OFFLOAD_H_)
30#define	_NETINET6_IN6_OFFLOAD_H_
31
32/*
33 * Subroutines to do software-only equivalent of h/w offloading.
34 */
35struct mbuf *tcp6_segment(struct mbuf *, int);
36struct sockaddr_in6;
37int ip6_tso_output(struct ifnet *, struct ifnet *, struct mbuf *,
38    const struct sockaddr_in6 *, struct rtentry *);
39void in6_undefer_cksum(struct mbuf *, size_t, int);
40void in6_undefer_cksum_tcpudp(struct mbuf *);
41
42extern int tcp_do_loopback_cksum; /* do TCP checksum on loopback? */
43extern int udp_do_loopback_cksum; /* do UDP checksum on loopback? */
44
45#define	IN6_LOOPBACK_NEED_CHECKSUM(csum_flags) \
46	((((csum_flags) & M_CSUM_UDPv6) != 0 && udp_do_loopback_cksum) || \
47	(((csum_flags) & M_CSUM_TCPv6) != 0 && tcp_do_loopback_cksum))
48
49#define	IN6_NEED_CHECKSUM(ifp, csum_flags) \
50	(__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \
51	IN6_LOOPBACK_NEED_CHECKSUM(csum_flags)))
52
53#endif /* !defined(_NETINET6_IN6_OFFLOAD_H_) */
54