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 struct neighbour *n; 90 91 /* 92 * Tail elements of dst_entry (__refcnt etc.) 93 * and these elements (rarely used in hot path) are in 94 * the same cache line. 95 */ 96 struct fib6_table *rt6i_table; 97 struct fib6_node *rt6i_node; 98 99 struct in6_addr rt6i_gateway; 100 101 atomic_t rt6i_ref; 102 103 /* These are in a separate cache line. */ 104 struct rt6key rt6i_dst ____cacheline_aligned_in_smp; 105 u32 rt6i_flags; 106 struct rt6key rt6i_src; 107 struct rt6key rt6i_prefsrc; 108 u32 rt6i_metric; 109 u32 rt6i_peer_genid; 110 111 struct inet6_dev *rt6i_idev; 112 unsigned long _rt6i_peer; 113 114 #ifdef CONFIG_XFRM 115 u32 rt6i_flow_cache_genid; 116 #endif 117 /* more non-fragment space at head required */ 118 unsigned short rt6i_nfheader_len; 119 120 u8 rt6i_protocol; 121 }; 122 123 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt) 124 { 125 return inetpeer_ptr(rt->_rt6i_peer); 126 } 127 128 static inline bool rt6_has_peer(struct rt6_info *rt) 129 { 130 return inetpeer_ptr_is_peer(rt->_rt6i_peer); 131 } 132 133 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer) 134 { 135 __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer); 136 } 137 138 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer) 139 { 140 return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer); 141 } 142 143 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base) 144 { 145 inetpeer_init_ptr(&rt->_rt6i_peer, base); 146 } 147 148 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort) 149 { 150 inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer); 151 } 152 153 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 154 { 155 return ((struct rt6_info *)dst)->rt6i_idev; 156 } 157 158 static inline void rt6_clean_expires(struct rt6_info *rt) 159 { 160 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) 161 dst_release(rt->dst.from); 162 163 rt->rt6i_flags &= ~RTF_EXPIRES; 164 rt->dst.from = NULL; 165 } 166 167 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) 168 { 169 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) 170 dst_release(rt->dst.from); 171 172 rt->rt6i_flags |= RTF_EXPIRES; 173 rt->dst.expires = expires; 174 } 175 176 static inline void rt6_update_expires(struct rt6_info *rt, int timeout) 177 { 178 if (!(rt->rt6i_flags & RTF_EXPIRES)) { 179 if (rt->dst.from) 180 dst_release(rt->dst.from); 181 /* dst_set_expires relies on expires == 0 182 * if it has not been set previously. 183 */ 184 rt->dst.expires = 0; 185 } 186 187 dst_set_expires(&rt->dst, timeout); 188 rt->rt6i_flags |= RTF_EXPIRES; 189 } 190 191 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) 192 { 193 struct dst_entry *new = (struct dst_entry *) from; 194 195 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) { 196 if (new == rt->dst.from) 197 return; 198 dst_release(rt->dst.from); 199 } 200 201 rt->rt6i_flags &= ~RTF_EXPIRES; 202 rt->dst.from = new; 203 dst_hold(new); 204 } 205 206 struct fib6_walker_t { 207 struct list_head lh; 208 struct fib6_node *root, *node; 209 struct rt6_info *leaf; 210 unsigned char state; 211 unsigned char prune; 212 unsigned int skip; 213 unsigned int count; 214 int (*func)(struct fib6_walker_t *); 215 void *args; 216 }; 217 218 struct rt6_statistics { 219 __u32 fib_nodes; 220 __u32 fib_route_nodes; 221 __u32 fib_rt_alloc; /* permanent routes */ 222 __u32 fib_rt_entries; /* rt entries in table */ 223 __u32 fib_rt_cache; /* cache routes */ 224 __u32 fib_discarded_routes; 225 }; 226 227 #define RTN_TL_ROOT 0x0001 228 #define RTN_ROOT 0x0002 /* tree root node */ 229 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 230 231 /* 232 * priority levels (or metrics) 233 * 234 */ 235 236 237 struct fib6_table { 238 struct hlist_node tb6_hlist; 239 u32 tb6_id; 240 rwlock_t tb6_lock; 241 struct fib6_node tb6_root; 242 struct inet_peer_base tb6_peers; 243 }; 244 245 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC 246 #define RT6_TABLE_MAIN RT_TABLE_MAIN 247 #define RT6_TABLE_DFLT RT6_TABLE_MAIN 248 #define RT6_TABLE_INFO RT6_TABLE_MAIN 249 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN 250 251 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 252 #define FIB6_TABLE_MIN 1 253 #define FIB6_TABLE_MAX RT_TABLE_MAX 254 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL 255 #else 256 #define FIB6_TABLE_MIN RT_TABLE_MAIN 257 #define FIB6_TABLE_MAX FIB6_TABLE_MIN 258 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN 259 #endif 260 261 typedef struct rt6_info *(*pol_lookup_t)(struct net *, 262 struct fib6_table *, 263 struct flowi6 *, int); 264 265 /* 266 * exported functions 267 */ 268 269 extern struct fib6_table *fib6_get_table(struct net *net, u32 id); 270 extern struct fib6_table *fib6_new_table(struct net *net, u32 id); 271 extern struct dst_entry *fib6_rule_lookup(struct net *net, 272 struct flowi6 *fl6, int flags, 273 pol_lookup_t lookup); 274 275 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 276 const struct in6_addr *daddr, 277 const struct in6_addr *saddr); 278 279 struct fib6_node *fib6_locate(struct fib6_node *root, 280 const struct in6_addr *daddr, int dst_len, 281 const struct in6_addr *saddr, int src_len); 282 283 extern void fib6_clean_all_ro(struct net *net, 284 int (*func)(struct rt6_info *, void *arg), 285 int prune, void *arg); 286 287 extern void fib6_clean_all(struct net *net, 288 int (*func)(struct rt6_info *, void *arg), 289 int prune, void *arg); 290 291 extern int fib6_add(struct fib6_node *root, 292 struct rt6_info *rt, 293 struct nl_info *info); 294 295 extern int fib6_del(struct rt6_info *rt, 296 struct nl_info *info); 297 298 extern void inet6_rt_notify(int event, struct rt6_info *rt, 299 struct nl_info *info); 300 301 extern void fib6_run_gc(unsigned long expires, 302 struct net *net); 303 304 extern void fib6_gc_cleanup(void); 305 306 extern int fib6_init(void); 307 308 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 309 extern int fib6_rules_init(void); 310 extern void fib6_rules_cleanup(void); 311 #else 312 static inline int fib6_rules_init(void) 313 { 314 return 0; 315 } 316 static inline void fib6_rules_cleanup(void) 317 { 318 return ; 319 } 320 #endif 321 #endif 322