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 u32 fc_type; /* only 8 bits are used */ 41 42 struct in6_addr fc_dst; 43 struct in6_addr fc_src; 44 struct in6_addr fc_prefsrc; 45 struct in6_addr fc_gateway; 46 47 unsigned long fc_expires; 48 struct nlattr *fc_mx; 49 int fc_mx_len; 50 int fc_mp_len; 51 struct nlattr *fc_mp; 52 53 struct nl_info fc_nlinfo; 54 }; 55 56 struct fib6_node { 57 struct fib6_node *parent; 58 struct fib6_node *left; 59 struct fib6_node *right; 60 #ifdef CONFIG_IPV6_SUBTREES 61 struct fib6_node *subtree; 62 #endif 63 struct rt6_info *leaf; 64 65 __u16 fn_bit; /* bit key */ 66 __u16 fn_flags; 67 __u32 fn_sernum; 68 struct rt6_info *rr_ptr; 69 }; 70 71 #ifndef CONFIG_IPV6_SUBTREES 72 #define FIB6_SUBTREE(fn) NULL 73 #else 74 #define FIB6_SUBTREE(fn) ((fn)->subtree) 75 #endif 76 77 /* 78 * routing information 79 * 80 */ 81 82 struct rt6key { 83 struct in6_addr addr; 84 int plen; 85 }; 86 87 struct fib6_table; 88 89 struct rt6_info { 90 struct dst_entry dst; 91 92 /* 93 * Tail elements of dst_entry (__refcnt etc.) 94 * and these elements (rarely used in hot path) are in 95 * the same cache line. 96 */ 97 struct fib6_table *rt6i_table; 98 struct fib6_node *rt6i_node; 99 100 struct in6_addr rt6i_gateway; 101 102 /* Multipath routes: 103 * siblings is a list of rt6_info that have the the same metric/weight, 104 * destination, but not the same gateway. nsiblings is just a cache 105 * to speed up lookup. 106 */ 107 struct list_head rt6i_siblings; 108 unsigned int rt6i_nsiblings; 109 110 atomic_t rt6i_ref; 111 112 /* These are in a separate cache line. */ 113 struct rt6key rt6i_dst ____cacheline_aligned_in_smp; 114 u32 rt6i_flags; 115 struct rt6key rt6i_src; 116 struct rt6key rt6i_prefsrc; 117 u32 rt6i_metric; 118 119 struct inet6_dev *rt6i_idev; 120 unsigned long _rt6i_peer; 121 122 u32 rt6i_genid; 123 124 /* more non-fragment space at head required */ 125 unsigned short rt6i_nfheader_len; 126 127 u8 rt6i_protocol; 128 }; 129 130 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt) 131 { 132 return inetpeer_ptr(rt->_rt6i_peer); 133 } 134 135 static inline bool rt6_has_peer(struct rt6_info *rt) 136 { 137 return inetpeer_ptr_is_peer(rt->_rt6i_peer); 138 } 139 140 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer) 141 { 142 __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer); 143 } 144 145 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer) 146 { 147 return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer); 148 } 149 150 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base) 151 { 152 inetpeer_init_ptr(&rt->_rt6i_peer, base); 153 } 154 155 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort) 156 { 157 inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer); 158 } 159 160 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 161 { 162 return ((struct rt6_info *)dst)->rt6i_idev; 163 } 164 165 static inline void rt6_clean_expires(struct rt6_info *rt) 166 { 167 rt->rt6i_flags &= ~RTF_EXPIRES; 168 rt->dst.expires = 0; 169 } 170 171 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) 172 { 173 rt->dst.expires = expires; 174 rt->rt6i_flags |= RTF_EXPIRES; 175 } 176 177 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout) 178 { 179 struct rt6_info *rt; 180 181 for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); 182 rt = (struct rt6_info *)rt->dst.from); 183 if (rt && rt != rt0) 184 rt0->dst.expires = rt->dst.expires; 185 186 dst_set_expires(&rt0->dst, timeout); 187 rt0->rt6i_flags |= RTF_EXPIRES; 188 } 189 190 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) 191 { 192 struct dst_entry *new = (struct dst_entry *) from; 193 194 rt->rt6i_flags &= ~RTF_EXPIRES; 195 dst_hold(new); 196 rt->dst.from = new; 197 } 198 199 static inline void ip6_rt_put(struct rt6_info *rt) 200 { 201 /* dst_release() accepts a NULL parameter. 202 * We rely on dst being first structure in struct rt6_info 203 */ 204 BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0); 205 dst_release(&rt->dst); 206 } 207 208 struct fib6_walker_t { 209 struct list_head lh; 210 struct fib6_node *root, *node; 211 struct rt6_info *leaf; 212 unsigned char state; 213 unsigned char prune; 214 unsigned int skip; 215 unsigned int count; 216 int (*func)(struct fib6_walker_t *); 217 void *args; 218 }; 219 220 struct rt6_statistics { 221 __u32 fib_nodes; 222 __u32 fib_route_nodes; 223 __u32 fib_rt_alloc; /* permanent routes */ 224 __u32 fib_rt_entries; /* rt entries in table */ 225 __u32 fib_rt_cache; /* cache routes */ 226 __u32 fib_discarded_routes; 227 }; 228 229 #define RTN_TL_ROOT 0x0001 230 #define RTN_ROOT 0x0002 /* tree root node */ 231 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 232 233 /* 234 * priority levels (or metrics) 235 * 236 */ 237 238 239 struct fib6_table { 240 struct hlist_node tb6_hlist; 241 u32 tb6_id; 242 rwlock_t tb6_lock; 243 struct fib6_node tb6_root; 244 struct inet_peer_base tb6_peers; 245 }; 246 247 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC 248 #define RT6_TABLE_MAIN RT_TABLE_MAIN 249 #define RT6_TABLE_DFLT RT6_TABLE_MAIN 250 #define RT6_TABLE_INFO RT6_TABLE_MAIN 251 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN 252 253 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 254 #define FIB6_TABLE_MIN 1 255 #define FIB6_TABLE_MAX RT_TABLE_MAX 256 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL 257 #else 258 #define FIB6_TABLE_MIN RT_TABLE_MAIN 259 #define FIB6_TABLE_MAX FIB6_TABLE_MIN 260 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN 261 #endif 262 263 typedef struct rt6_info *(*pol_lookup_t)(struct net *, 264 struct fib6_table *, 265 struct flowi6 *, int); 266 267 /* 268 * exported functions 269 */ 270 271 struct fib6_table *fib6_get_table(struct net *net, u32 id); 272 struct fib6_table *fib6_new_table(struct net *net, u32 id); 273 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, 274 int flags, pol_lookup_t lookup); 275 276 struct fib6_node *fib6_lookup(struct fib6_node *root, 277 const struct in6_addr *daddr, 278 const struct in6_addr *saddr); 279 280 struct fib6_node *fib6_locate(struct fib6_node *root, 281 const struct in6_addr *daddr, int dst_len, 282 const struct in6_addr *saddr, int src_len); 283 284 void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), 285 void *arg); 286 287 int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info); 288 289 int fib6_del(struct rt6_info *rt, struct nl_info *info); 290 291 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info); 292 293 void fib6_run_gc(unsigned long expires, struct net *net, bool force); 294 295 void fib6_gc_cleanup(void); 296 297 int fib6_init(void); 298 299 int ipv6_route_open(struct inode *inode, struct file *file); 300 301 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 302 int fib6_rules_init(void); 303 void fib6_rules_cleanup(void); 304 #else 305 static inline int fib6_rules_init(void) 306 { 307 return 0; 308 } 309 static inline void fib6_rules_cleanup(void) 310 { 311 return ; 312 } 313 #endif 314 #endif 315