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 *
ip_hdr(struct sk_buff * skb)57 ip_hdr(struct sk_buff *skb)
58 {
59
60 return (struct iphdr *)skb_network_header(skb);
61 }
62
63 static __inline void
ip_send_check(struct iphdr * iph)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