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 31 #ifndef _LINUXKPI_LINUX_IP_H 32 #define _LINUXKPI_LINUX_IP_H 33 34 #include <sys/types.h> 35 36 #include <netinet/in.h> 37 #include <netinet/ip.h> 38 #include <machine/in_cksum.h> 39 40 #include <linux/skbuff.h> 41 42 /* (u) unconfirmed structure field names; using FreeBSD's meanwhile. */ 43 struct iphdr { 44 uint8_t ip_hl:4, ip_ver:4; /* (u) */ 45 uint8_t ip_tos; /* (u) */ 46 uint16_t ip_len; /* (u) */ 47 uint16_t id; 48 uint16_t ip_off; /* (u) */ 49 uint8_t ip_ttl; /* (u) */ 50 uint8_t protocol; 51 uint16_t check; 52 uint32_t saddr; 53 uint32_t daddr; 54 }; 55 56 static __inline struct iphdr * 57 ip_hdr(struct sk_buff *skb) 58 { 59 60 return (struct iphdr *)skb_network_header(skb); 61 } 62 63 static __inline void 64 ip_send_check(struct iphdr *iph) 65 { 66 67 /* Clear the checksum before computing! */ 68 iph->check = 0; 69 /* An IPv4 header is the same everywhere even if names differ. */ 70 iph->check = in_cksum_hdr((const void *)iph); 71 } 72 73 #endif /* _LINUXKPI_LINUX_IP_H */ 74