forked from mirrors/linux
171916cbd5
The function only initializes the XFRM CB in the skb.
After previous patch xfrm4_extract_header is only called from
net/xfrm/xfrm_{input,output}.c.
Because of IPV6=m linker errors the ipv6 equivalent
(xfrm6_extract_header) was already placed in xfrm_inout.h because
we can't call functions residing in a module from the core.
So do the same for the ipv4 helper and place it next to the ipv6 one.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/ipv6.h>
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#include <net/dsfield.h>
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#include <net/xfrm.h>
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#ifndef XFRM_INOUT_H
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#define XFRM_INOUT_H 1
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static inline void xfrm4_extract_header(struct sk_buff *skb)
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{
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const struct iphdr *iph = ip_hdr(skb);
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XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
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XFRM_MODE_SKB_CB(skb)->id = iph->id;
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XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
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XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
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XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
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XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
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memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
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sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
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}
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static inline void xfrm6_extract_header(struct sk_buff *skb)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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struct ipv6hdr *iph = ipv6_hdr(skb);
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XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
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XFRM_MODE_SKB_CB(skb)->id = 0;
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XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
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XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
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XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
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XFRM_MODE_SKB_CB(skb)->optlen = 0;
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memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
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sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
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#else
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WARN_ON_ONCE(1);
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#endif
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}
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static inline void xfrm6_beet_make_header(struct sk_buff *skb)
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{
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struct ipv6hdr *iph = ipv6_hdr(skb);
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iph->version = 6;
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memcpy(iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
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sizeof(iph->flow_lbl));
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iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol;
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ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
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iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
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}
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static inline void xfrm4_beet_make_header(struct sk_buff *skb)
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{
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struct iphdr *iph = ip_hdr(skb);
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iph->ihl = 5;
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iph->version = 4;
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iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
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iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
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iph->id = XFRM_MODE_SKB_CB(skb)->id;
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iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
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iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;
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}
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#endif
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