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 26 struct ila_locator { 27 union { 28 __u8 v8[8]; 29 __be16 v16[4]; 30 __be32 v32[2]; 31 __be64 v64; 32 }; 33 }; 34 35 struct 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 enum { 59 ILA_ATYPE_IID = 0, 60 ILA_ATYPE_LUID, 61 ILA_ATYPE_VIRT_V4, 62 ILA_ATYPE_VIRT_UNI_V6, 63 ILA_ATYPE_VIRT_MULTI_V6, 64 ILA_ATYPE_RSVD_1, 65 ILA_ATYPE_RSVD_2, 66 ILA_ATYPE_RSVD_3, 67 }; 68 69 #define CSUM_NEUTRAL_FLAG htonl(0x10000000) 70 71 struct ila_addr { 72 union { 73 struct in6_addr addr; 74 struct { 75 struct ila_locator loc; 76 struct ila_identifier ident; 77 }; 78 }; 79 }; 80 81 static inline struct ila_addr *ila_a2i(struct in6_addr *addr) 82 { 83 return (struct ila_addr *)addr; 84 } 85 86 static inline bool ila_addr_is_ila(struct ila_addr *iaddr) 87 { 88 return (iaddr->ident.type != ILA_ATYPE_IID); 89 } 90 91 struct ila_params { 92 struct ila_locator locator; 93 struct ila_locator locator_match; 94 __wsum csum_diff; 95 u8 csum_mode; 96 }; 97 98 static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to) 99 { 100 __be32 diff[] = { 101 ~from[0], ~from[1], to[0], to[1], 102 }; 103 104 return csum_partial(diff, sizeof(diff), 0); 105 } 106 107 static inline bool ila_csum_neutral_set(struct ila_identifier ident) 108 { 109 return !!(ident.csum_neutral); 110 } 111 112 void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p, 113 bool set_csum_neutral); 114 115 void ila_init_saved_csum(struct ila_params *p); 116 117 int ila_lwt_init(void); 118 void ila_lwt_fini(void); 119 int ila_xlat_init(void); 120 void ila_xlat_fini(void); 121 122 #endif /* __ILA_H */ 123