1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/ipv6.h>
3 #include <net/dsfield.h>
4 #include <net/xfrm.h>
5
6 #ifndef XFRM_INOUT_H
7 #define XFRM_INOUT_H 1
8
9 static inline void xfrm4_extract_header(struct sk_buff *skb)
10 {
11 const struct iphdr *iph = ip_hdr(skb);
12
13 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
14 XFRM_MODE_SKB_CB(skb)->id = iph->id;
15 XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
16 XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
17 XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
18 XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
19 memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
20 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
21 }
22
23 static inline void xfrm6_extract_header(struct sk_buff *skb)
24 {
25 #if IS_ENABLED(CONFIG_IPV6)
26 struct ipv6hdr *iph = ipv6_hdr(skb);
27
28 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
29 XFRM_MODE_SKB_CB(skb)->id = 0;
30 XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
31 XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
32 XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
33 XFRM_MODE_SKB_CB(skb)->optlen = 0;
34 memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
35 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
36 #else
37 WARN_ON_ONCE(1);
38 #endif
39 }
40
41 static inline void xfrm6_beet_make_header(struct sk_buff *skb)
42 {
43 struct ipv6hdr *iph = ipv6_hdr(skb);
44
45 iph->version = 6;
46
47 memcpy(iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
48 sizeof(iph->flow_lbl));
49 iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol;
50
51 ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
52 iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
53 }
54
55 static inline void xfrm4_beet_make_header(struct sk_buff *skb)
56 {
57 struct iphdr *iph = ip_hdr(skb);
58
59 iph->ihl = 5;
60 iph->version = 4;
61
62 iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
63 iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
64
65 iph->id = XFRM_MODE_SKB_CB(skb)->id;
66 iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
67 iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;
68 }
69
70 #endif
71
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