1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2020-2021 The FreeBSD Foundation 5 * 6 * This software was developed by Björn Zeeb under sponsorship from 7 * the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 #ifndef _LINUXKPI_LINUX_TCP_H 34 #define _LINUXKPI_LINUX_TCP_H 35 36 #include <sys/types.h> 37 #include <linux/skbuff.h> 38 39 /* (u) unconfirmed structure field names; using FreeBSD's meanwhile. */ 40 struct tcphdr { 41 uint16_t source; /* (u) */ 42 uint16_t dest; /* (u) */ 43 uint32_t th_seq; /* (u) */ 44 uint32_t th_ack; /* (u) */ 45 #if BYTE_ORDER == LITTLE_ENDIAN 46 uint8_t th_x2:4, doff:4; 47 #elif BYTE_ORDER == BIG_ENDIAN 48 uint8_t doff:4, th_x2:4; 49 #endif 50 uint8_t th_flags; /* (u) */ 51 uint16_t th_win; /* (u) */ 52 uint16_t check; 53 uint16_t th_urg; /* (u) */ 54 }; 55 56 static __inline struct tcphdr * 57 tcp_hdr(struct sk_buff *skb) 58 { 59 60 return (struct tcphdr *)skb_transport_header(skb); 61 } 62 63 static __inline uint32_t 64 tcp_hdrlen(struct sk_buff *skb) 65 { 66 struct tcphdr *th; 67 68 th = tcp_hdr(skb); 69 return (4 * th->doff); 70 } 71 72 #endif /* _LINUXKPI_LINUX_TCP_H */ 73