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/genetlink.h> 23 #include <net/ip.h> 24 #include <net/protocol.h> 25 #include <uapi/linux/ila.h> 26 27 struct ila_locator { 28 union { 29 __u8 v8[8]; 30 __be16 v16[4]; 31 __be32 v32[2]; 32 __be64 v64; 33 }; 34 }; 35 36 struct ila_identifier { 37 union { 38 struct { 39 #if defined(__LITTLE_ENDIAN_BITFIELD) 40 u8 __space:4; 41 u8 csum_neutral:1; 42 u8 type:3; 43 #elif defined(__BIG_ENDIAN_BITFIELD) 44 u8 type:3; 45 u8 csum_neutral:1; 46 u8 __space:4; 47 #else 48 #error "Adjust your <asm/byteorder.h> defines" 49 #endif 50 u8 __space2[7]; 51 }; 52 __u8 v8[8]; 53 __be16 v16[4]; 54 __be32 v32[2]; 55 __be64 v64; 56 }; 57 }; 58 59 #define CSUM_NEUTRAL_FLAG htonl(0x10000000) 60 61 struct ila_addr { 62 union { 63 struct in6_addr addr; 64 struct { 65 struct ila_locator loc; 66 struct ila_identifier ident; 67 }; 68 }; 69 }; 70 71 static inline struct ila_addr *ila_a2i(struct in6_addr *addr) 72 { 73 return (struct ila_addr *)addr; 74 } 75 76 static inline bool ila_addr_is_ila(struct ila_addr *iaddr) 77 { 78 return (iaddr->ident.type != ILA_ATYPE_IID); 79 } 80 81 struct ila_params { 82 struct ila_locator locator; 83 struct ila_locator locator_match; 84 __wsum csum_diff; 85 u8 csum_mode; 86 u8 ident_type; 87 }; 88 89 static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to) 90 { 91 __be32 diff[] = { 92 ~from[0], ~from[1], to[0], to[1], 93 }; 94 95 return csum_partial(diff, sizeof(diff), 0); 96 } 97 98 static inline bool ila_csum_neutral_set(struct ila_identifier ident) 99 { 100 return !!(ident.csum_neutral); 101 } 102 103 void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p, 104 bool set_csum_neutral); 105 106 void ila_init_saved_csum(struct ila_params *p); 107 108 struct ila_net { 109 struct { 110 struct rhashtable rhash_table; 111 spinlock_t *locks; /* Bucket locks for entry manipulation */ 112 unsigned int locks_mask; 113 bool hooks_registered; 114 } xlat; 115 }; 116 117 int ila_lwt_init(void); 118 void ila_lwt_fini(void); 119 120 int ila_xlat_init_net(struct net *net); 121 void ila_xlat_exit_net(struct net *net); 122 123 int ila_xlat_nl_cmd_add_mapping(struct sk_buff *skb, struct genl_info *info); 124 int ila_xlat_nl_cmd_del_mapping(struct sk_buff *skb, struct genl_info *info); 125 int ila_xlat_nl_cmd_get_mapping(struct sk_buff *skb, struct genl_info *info); 126 int ila_xlat_nl_cmd_flush(struct sk_buff *skb, struct genl_info *info); 127 int ila_xlat_nl_dump_start(struct netlink_callback *cb); 128 int ila_xlat_nl_dump_done(struct netlink_callback *cb); 129 int ila_xlat_nl_dump(struct sk_buff *skb, struct netlink_callback *cb); 130 131 extern unsigned int ila_net_id; 132 133 extern struct genl_family ila_nl_family; 134 135 #endif /* __ILA_H */ 136