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#include <linux/types.h>
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#define IPCOMP_SCRATCH_SIZE 65400
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struct crypto_comp * __percpu *tfms;
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int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb);
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int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb);
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void ipcomp_destroy(struct xfrm_state *x);
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int ipcomp_init_state(struct xfrm_state *x);
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static inline struct ip_comp_hdr *ip_comp_hdr(const struct sk_buff *skb)
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return (struct ip_comp_hdr *)skb_transport_header(skb);