1/*
  2 * Copyright (c) 2015 Tom Herbert <tom@herbertland.com>
  3 *
  4 * This program is free software; you can redistribute it and/or
  5 * modify it under the terms of the GNU General Public License as
  6 * published by the Free Software Foundation; either version 2 of
  7 * the License, or (at your option) any later version.
  8 *
  9 */
 10
 11#ifndef __ILA_H
 12#define __ILA_H
 13
 14#include <linux/errno.h>
 15#include <linux/ip.h>
 16#include <linux/kernel.h>
 17#include <linux/module.h>
 18#include <linux/socket.h>
 19#include <linux/skbuff.h>
 20#include <linux/types.h>
 21#include <net/checksum.h>
 22#include <net/ip.h>
 23#include <net/protocol.h>
 24#include <uapi/linux/ila.h>
 25
 26struct ila_locator {
 27	union {
 28		__u8            v8[8];
 29		__be16          v16[4];
 30		__be32          v32[2];
 31		__be64		v64;
 32	};
 33};
 34
 35struct ila_identifier {
 36	union {
 37		struct {
 38#if defined(__LITTLE_ENDIAN_BITFIELD)
 39			u8 __space:4;
 40			u8 csum_neutral:1;
 41			u8 type:3;
 42#elif defined(__BIG_ENDIAN_BITFIELD)
 43			u8 type:3;
 44			u8 csum_neutral:1;
 45			u8 __space:4;
 46#else
 47#error  "Adjust your <asm/byteorder.h> defines"
 48#endif
 49			u8 __space2[7];
 50		};
 51		__u8            v8[8];
 52		__be16          v16[4];
 53		__be32          v32[2];
 54		__be64		v64;
 55	};
 56};
 57
 58#define CSUM_NEUTRAL_FLAG	htonl(0x10000000)
 59
 60struct ila_addr {
 61	union {
 62		struct in6_addr addr;
 63		struct {
 64			struct ila_locator loc;
 65			struct ila_identifier ident;
 66		};
 67	};
 68};
 69
 70static inline struct ila_addr *ila_a2i(struct in6_addr *addr)
 71{
 72	return (struct ila_addr *)addr;
 73}
 74
 75static inline bool ila_addr_is_ila(struct ila_addr *iaddr)
 76{
 77	return (iaddr->ident.type != ILA_ATYPE_IID);
 78}
 79
 80struct ila_params {
 81	struct ila_locator locator;
 82	struct ila_locator locator_match;
 83	__wsum csum_diff;
 84	u8 csum_mode;
 85	u8 ident_type;
 86};
 87
 88static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
 89{
 90	__be32 diff[] = {
 91		~from[0], ~from[1], to[0], to[1],
 92	};
 93
 94	return csum_partial(diff, sizeof(diff), 0);
 95}
 96
 97static inline bool ila_csum_neutral_set(struct ila_identifier ident)
 98{
 99	return !!(ident.csum_neutral);
100}
101
102void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
103			     bool set_csum_neutral);
104
105void ila_init_saved_csum(struct ila_params *p);
106
107int ila_lwt_init(void);
108void ila_lwt_fini(void);
109int ila_xlat_init(void);
110void ila_xlat_fini(void);
111
112#endif /* __ILA_H */