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 static inline void rt6_clean_expires(struct rt6_info *rt) 127 { 128 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) 129 dst_release(rt->dst.from); 130 131 rt->rt6i_flags &= ~RTF_EXPIRES; 132 rt->dst.from = NULL; 133 } 134 135 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) 136 { 137 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) 138 dst_release(rt->dst.from); 139 140 rt->rt6i_flags |= RTF_EXPIRES; 141 rt->dst.expires = expires; 142 } 143 144 static inline void rt6_update_expires(struct rt6_info *rt, int timeout) 145 { 146 if (!(rt->rt6i_flags & RTF_EXPIRES)) { 147 if (rt->dst.from) 148 dst_release(rt->dst.from); 149 /* dst_set_expires relies on expires == 0 150 * if it has not been set previously. 151 */ 152 rt->dst.expires = 0; 153 } 154 155 dst_set_expires(&rt->dst, timeout); 156 rt->rt6i_flags |= RTF_EXPIRES; 157 } 158 159 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) 160 { 161 struct dst_entry *new = (struct dst_entry *) from; 162 163 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) { 164 if (new == rt->dst.from) 165 return; 166 dst_release(rt->dst.from); 167 } 168 169 rt->rt6i_flags &= ~RTF_EXPIRES; 170 rt->dst.from = new; 171 dst_hold(new); 172 } 173 174 struct fib6_walker_t { 175 struct list_head lh; 176 struct fib6_node *root, *node; 177 struct rt6_info *leaf; 178 unsigned char state; 179 unsigned char prune; 180 unsigned int skip; 181 unsigned int count; 182 int (*func)(struct fib6_walker_t *); 183 void *args; 184 }; 185 186 struct rt6_statistics { 187 __u32 fib_nodes; 188 __u32 fib_route_nodes; 189 __u32 fib_rt_alloc; /* permanent routes */ 190 __u32 fib_rt_entries; /* rt entries in table */ 191 __u32 fib_rt_cache; /* cache routes */ 192 __u32 fib_discarded_routes; 193 }; 194 195 #define RTN_TL_ROOT 0x0001 196 #define RTN_ROOT 0x0002 /* tree root node */ 197 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 198 199 /* 200 * priority levels (or metrics) 201 * 202 */ 203 204 205 struct fib6_table { 206 struct hlist_node tb6_hlist; 207 u32 tb6_id; 208 rwlock_t tb6_lock; 209 struct fib6_node tb6_root; 210 }; 211 212 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC 213 #define RT6_TABLE_MAIN RT_TABLE_MAIN 214 #define RT6_TABLE_DFLT RT6_TABLE_MAIN 215 #define RT6_TABLE_INFO RT6_TABLE_MAIN 216 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN 217 218 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 219 #define FIB6_TABLE_MIN 1 220 #define FIB6_TABLE_MAX RT_TABLE_MAX 221 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL 222 #else 223 #define FIB6_TABLE_MIN RT_TABLE_MAIN 224 #define FIB6_TABLE_MAX FIB6_TABLE_MIN 225 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN 226 #endif 227 228 typedef struct rt6_info *(*pol_lookup_t)(struct net *, 229 struct fib6_table *, 230 struct flowi6 *, int); 231 232 /* 233 * exported functions 234 */ 235 236 extern struct fib6_table *fib6_get_table(struct net *net, u32 id); 237 extern struct fib6_table *fib6_new_table(struct net *net, u32 id); 238 extern struct dst_entry *fib6_rule_lookup(struct net *net, 239 struct flowi6 *fl6, int flags, 240 pol_lookup_t lookup); 241 242 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 243 const struct in6_addr *daddr, 244 const struct in6_addr *saddr); 245 246 struct fib6_node *fib6_locate(struct fib6_node *root, 247 const struct in6_addr *daddr, int dst_len, 248 const struct in6_addr *saddr, int src_len); 249 250 extern void fib6_clean_all_ro(struct net *net, 251 int (*func)(struct rt6_info *, void *arg), 252 int prune, void *arg); 253 254 extern void fib6_clean_all(struct net *net, 255 int (*func)(struct rt6_info *, void *arg), 256 int prune, void *arg); 257 258 extern int fib6_add(struct fib6_node *root, 259 struct rt6_info *rt, 260 struct nl_info *info); 261 262 extern int fib6_del(struct rt6_info *rt, 263 struct nl_info *info); 264 265 extern void inet6_rt_notify(int event, struct rt6_info *rt, 266 struct nl_info *info); 267 268 extern void fib6_run_gc(unsigned long expires, 269 struct net *net); 270 271 extern void fib6_gc_cleanup(void); 272 273 extern int fib6_init(void); 274 275 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 276 extern int fib6_rules_init(void); 277 extern void fib6_rules_cleanup(void); 278 #else 279 static inline int fib6_rules_init(void) 280 { 281 return 0; 282 } 283 static inline void fib6_rules_cleanup(void) 284 { 285 return ; 286 } 287 #endif 288 #endif 289