1b26fb63fSBjoern A. Zeeb /*-
2b26fb63fSBjoern A. Zeeb * SPDX-License-Identifier: BSD-2-Clause
3b26fb63fSBjoern A. Zeeb *
4b26fb63fSBjoern A. Zeeb * Copyright (c) 2020-2021 The FreeBSD Foundation
5b26fb63fSBjoern A. Zeeb *
6b26fb63fSBjoern A. Zeeb * This software was developed by Björn Zeeb under sponsorship from
7b26fb63fSBjoern A. Zeeb * the FreeBSD Foundation.
8b26fb63fSBjoern A. Zeeb *
9b26fb63fSBjoern A. Zeeb * Redistribution and use in source and binary forms, with or without
10b26fb63fSBjoern A. Zeeb * modification, are permitted provided that the following conditions
11b26fb63fSBjoern A. Zeeb * are met:
12b26fb63fSBjoern A. Zeeb * 1. Redistributions of source code must retain the above copyright
13b26fb63fSBjoern A. Zeeb * notice, this list of conditions and the following disclaimer.
14b26fb63fSBjoern A. Zeeb * 2. Redistributions in binary form must reproduce the above copyright
15b26fb63fSBjoern A. Zeeb * notice, this list of conditions and the following disclaimer in the
16b26fb63fSBjoern A. Zeeb * documentation and/or other materials provided with the distribution.
17b26fb63fSBjoern A. Zeeb *
18b26fb63fSBjoern A. Zeeb * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19b26fb63fSBjoern A. Zeeb * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20b26fb63fSBjoern A. Zeeb * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21b26fb63fSBjoern A. Zeeb * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22b26fb63fSBjoern A. Zeeb * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23b26fb63fSBjoern A. Zeeb * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24b26fb63fSBjoern A. Zeeb * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25b26fb63fSBjoern A. Zeeb * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26b26fb63fSBjoern A. Zeeb * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27b26fb63fSBjoern A. Zeeb * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28b26fb63fSBjoern A. Zeeb * SUCH DAMAGE.
29b26fb63fSBjoern A. Zeeb */
30b26fb63fSBjoern A. Zeeb
31307f78f3SVladimir Kondratyev #ifndef _LINUXKPI_LINUX_TCP_H
32307f78f3SVladimir Kondratyev #define _LINUXKPI_LINUX_TCP_H
33b26fb63fSBjoern A. Zeeb
34b26fb63fSBjoern A. Zeeb #include <sys/types.h>
35b26fb63fSBjoern A. Zeeb #include <linux/skbuff.h>
36b26fb63fSBjoern A. Zeeb
37b26fb63fSBjoern A. Zeeb /* (u) unconfirmed structure field names; using FreeBSD's meanwhile. */
38b26fb63fSBjoern A. Zeeb struct tcphdr {
39b26fb63fSBjoern A. Zeeb uint16_t source; /* (u) */
40b26fb63fSBjoern A. Zeeb uint16_t dest; /* (u) */
41b26fb63fSBjoern A. Zeeb uint32_t th_seq; /* (u) */
42b26fb63fSBjoern A. Zeeb uint32_t th_ack; /* (u) */
43b26fb63fSBjoern A. Zeeb #if BYTE_ORDER == LITTLE_ENDIAN
44b26fb63fSBjoern A. Zeeb uint8_t th_x2:4, doff:4;
45b26fb63fSBjoern A. Zeeb #elif BYTE_ORDER == BIG_ENDIAN
46b26fb63fSBjoern A. Zeeb uint8_t doff:4, th_x2:4;
47b26fb63fSBjoern A. Zeeb #endif
48b26fb63fSBjoern A. Zeeb uint8_t th_flags; /* (u) */
49b26fb63fSBjoern A. Zeeb uint16_t th_win; /* (u) */
50b26fb63fSBjoern A. Zeeb uint16_t check;
51b26fb63fSBjoern A. Zeeb uint16_t th_urg; /* (u) */
52b26fb63fSBjoern A. Zeeb };
53b26fb63fSBjoern A. Zeeb
54b26fb63fSBjoern A. Zeeb static __inline struct tcphdr *
tcp_hdr(struct sk_buff * skb)55b26fb63fSBjoern A. Zeeb tcp_hdr(struct sk_buff *skb)
56b26fb63fSBjoern A. Zeeb {
57b26fb63fSBjoern A. Zeeb
58b26fb63fSBjoern A. Zeeb return (struct tcphdr *)skb_transport_header(skb);
59b26fb63fSBjoern A. Zeeb }
60b26fb63fSBjoern A. Zeeb
61b26fb63fSBjoern A. Zeeb static __inline uint32_t
tcp_hdrlen(struct sk_buff * skb)62b26fb63fSBjoern A. Zeeb tcp_hdrlen(struct sk_buff *skb)
63b26fb63fSBjoern A. Zeeb {
64b26fb63fSBjoern A. Zeeb struct tcphdr *th;
65b26fb63fSBjoern A. Zeeb
66b26fb63fSBjoern A. Zeeb th = tcp_hdr(skb);
67b26fb63fSBjoern A. Zeeb return (4 * th->doff);
68b26fb63fSBjoern A. Zeeb }
69b26fb63fSBjoern A. Zeeb
70307f78f3SVladimir Kondratyev #endif /* _LINUXKPI_LINUX_TCP_H */
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