1 /* 2 * Linux INET6 implementation 3 * 4 * Authors: 5 * Pedro Roque <roque@di.fc.ul.pt> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _IP6_FIB_H 14 #define _IP6_FIB_H 15 16 #include <linux/ipv6_route.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/spinlock.h> 19 #include <net/dst.h> 20 #include <net/flow.h> 21 #include <net/netlink.h> 22 #include <net/inetpeer.h> 23 24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 25 #define FIB6_TABLE_HASHSZ 256 26 #else 27 #define FIB6_TABLE_HASHSZ 1 28 #endif 29 30 struct rt6_info; 31 32 struct fib6_config { 33 u32 fc_table; 34 u32 fc_metric; 35 int fc_dst_len; 36 int fc_src_len; 37 int fc_ifindex; 38 u32 fc_flags; 39 u32 fc_protocol; 40 41 struct in6_addr fc_dst; 42 struct in6_addr fc_src; 43 struct in6_addr fc_prefsrc; 44 struct in6_addr fc_gateway; 45 46 unsigned long fc_expires; 47 struct nlattr *fc_mx; 48 int fc_mx_len; 49 50 struct nl_info fc_nlinfo; 51 }; 52 53 struct fib6_node { 54 struct fib6_node *parent; 55 struct fib6_node *left; 56 struct fib6_node *right; 57 #ifdef CONFIG_IPV6_SUBTREES 58 struct fib6_node *subtree; 59 #endif 60 struct rt6_info *leaf; 61 62 __u16 fn_bit; /* bit key */ 63 __u16 fn_flags; 64 __u32 fn_sernum; 65 struct rt6_info *rr_ptr; 66 }; 67 68 #ifndef CONFIG_IPV6_SUBTREES 69 #define FIB6_SUBTREE(fn) NULL 70 #else 71 #define FIB6_SUBTREE(fn) ((fn)->subtree) 72 #endif 73 74 /* 75 * routing information 76 * 77 */ 78 79 struct rt6key { 80 struct in6_addr addr; 81 int plen; 82 }; 83 84 struct fib6_table; 85 86 struct rt6_info { 87 struct dst_entry dst; 88 89 /* 90 * Tail elements of dst_entry (__refcnt etc.) 91 * and these elements (rarely used in hot path) are in 92 * the same cache line. 93 */ 94 struct fib6_table *rt6i_table; 95 struct fib6_node *rt6i_node; 96 97 struct in6_addr rt6i_gateway; 98 99 atomic_t rt6i_ref; 100 101 /* These are in a separate cache line. */ 102 struct rt6key rt6i_dst ____cacheline_aligned_in_smp; 103 u32 rt6i_flags; 104 struct rt6key rt6i_src; 105 struct rt6key rt6i_prefsrc; 106 u32 rt6i_metric; 107 u32 rt6i_peer_genid; 108 109 struct inet6_dev *rt6i_idev; 110 struct inet_peer *rt6i_peer; 111 112 #ifdef CONFIG_XFRM 113 u32 rt6i_flow_cache_genid; 114 #endif 115 /* more non-fragment space at head required */ 116 unsigned short rt6i_nfheader_len; 117 118 u8 rt6i_protocol; 119 }; 120 121 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 122 { 123 return ((struct rt6_info *)dst)->rt6i_idev; 124 } 125 126 struct fib6_walker_t { 127 struct list_head lh; 128 struct fib6_node *root, *node; 129 struct rt6_info *leaf; 130 unsigned char state; 131 unsigned char prune; 132 unsigned int skip; 133 unsigned int count; 134 int (*func)(struct fib6_walker_t *); 135 void *args; 136 }; 137 138 struct rt6_statistics { 139 __u32 fib_nodes; 140 __u32 fib_route_nodes; 141 __u32 fib_rt_alloc; /* permanent routes */ 142 __u32 fib_rt_entries; /* rt entries in table */ 143 __u32 fib_rt_cache; /* cache routes */ 144 __u32 fib_discarded_routes; 145 }; 146 147 #define RTN_TL_ROOT 0x0001 148 #define RTN_ROOT 0x0002 /* tree root node */ 149 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 150 151 /* 152 * priority levels (or metrics) 153 * 154 */ 155 156 157 struct fib6_table { 158 struct hlist_node tb6_hlist; 159 u32 tb6_id; 160 rwlock_t tb6_lock; 161 struct fib6_node tb6_root; 162 }; 163 164 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC 165 #define RT6_TABLE_MAIN RT_TABLE_MAIN 166 #define RT6_TABLE_DFLT RT6_TABLE_MAIN 167 #define RT6_TABLE_INFO RT6_TABLE_MAIN 168 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN 169 170 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 171 #define FIB6_TABLE_MIN 1 172 #define FIB6_TABLE_MAX RT_TABLE_MAX 173 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL 174 #else 175 #define FIB6_TABLE_MIN RT_TABLE_MAIN 176 #define FIB6_TABLE_MAX FIB6_TABLE_MIN 177 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN 178 #endif 179 180 typedef struct rt6_info *(*pol_lookup_t)(struct net *, 181 struct fib6_table *, 182 struct flowi6 *, int); 183 184 /* 185 * exported functions 186 */ 187 188 extern struct fib6_table *fib6_get_table(struct net *net, u32 id); 189 extern struct fib6_table *fib6_new_table(struct net *net, u32 id); 190 extern struct dst_entry *fib6_rule_lookup(struct net *net, 191 struct flowi6 *fl6, int flags, 192 pol_lookup_t lookup); 193 194 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 195 const struct in6_addr *daddr, 196 const struct in6_addr *saddr); 197 198 struct fib6_node *fib6_locate(struct fib6_node *root, 199 const struct in6_addr *daddr, int dst_len, 200 const struct in6_addr *saddr, int src_len); 201 202 extern void fib6_clean_all_ro(struct net *net, 203 int (*func)(struct rt6_info *, void *arg), 204 int prune, void *arg); 205 206 extern void fib6_clean_all(struct net *net, 207 int (*func)(struct rt6_info *, void *arg), 208 int prune, void *arg); 209 210 extern int fib6_add(struct fib6_node *root, 211 struct rt6_info *rt, 212 struct nl_info *info); 213 214 extern int fib6_del(struct rt6_info *rt, 215 struct nl_info *info); 216 217 extern void inet6_rt_notify(int event, struct rt6_info *rt, 218 struct nl_info *info); 219 220 extern void fib6_run_gc(unsigned long expires, 221 struct net *net); 222 223 extern void fib6_gc_cleanup(void); 224 225 extern int fib6_init(void); 226 227 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 228 extern int fib6_rules_init(void); 229 extern void fib6_rules_cleanup(void); 230 #else 231 static inline int fib6_rules_init(void) 232 { 233 return 0; 234 } 235 static inline void fib6_rules_cleanup(void) 236 { 237 return ; 238 } 239 #endif 240 #endif 241