1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/ipv6.h>
3 #include <net/dsfield.h>
9 static inline void xfrm4_extract_header(struct sk_buff *skb)
11 const struct iphdr *iph = ip_hdr(skb);
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));
23 static inline void xfrm6_extract_header(struct sk_buff *skb)
25 #if IS_ENABLED(CONFIG_IPV6)
26 struct ipv6hdr *iph = ipv6_hdr(skb);
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));
41 static inline void xfrm6_beet_make_header(struct sk_buff *skb)
43 struct ipv6hdr *iph = ipv6_hdr(skb);
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;
51 ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
52 iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
55 static inline void xfrm4_beet_make_header(struct sk_buff *skb)
57 struct iphdr *iph = ip_hdr(skb);
62 iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
63 iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
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;