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 #define rt6i_dev dst.dev 90 #define rt6i_nexthop dst.neighbour 91 #define rt6i_expires dst.expires 92 93 /* 94 * Tail elements of dst_entry (__refcnt etc.) 95 * and these elements (rarely used in hot path) are in 96 * the same cache line. 97 */ 98 struct fib6_table *rt6i_table; 99 struct fib6_node *rt6i_node; 100 101 struct in6_addr rt6i_gateway; 102 103 atomic_t rt6i_ref; 104 105 /* These are in a separate cache line. */ 106 struct rt6key rt6i_dst ____cacheline_aligned_in_smp; 107 u32 rt6i_flags; 108 struct rt6key rt6i_src; 109 struct rt6key rt6i_prefsrc; 110 u32 rt6i_metric; 111 u32 rt6i_peer_genid; 112 113 struct inet6_dev *rt6i_idev; 114 struct inet_peer *rt6i_peer; 115 116 #ifdef CONFIG_XFRM 117 u32 rt6i_flow_cache_genid; 118 #endif 119 /* more non-fragment space at head required */ 120 unsigned short rt6i_nfheader_len; 121 122 u8 rt6i_protocol; 123 }; 124 125 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 126 { 127 return ((struct rt6_info *)dst)->rt6i_idev; 128 } 129 130 struct fib6_walker_t { 131 struct list_head lh; 132 struct fib6_node *root, *node; 133 struct rt6_info *leaf; 134 unsigned char state; 135 unsigned char prune; 136 unsigned int skip; 137 unsigned int count; 138 int (*func)(struct fib6_walker_t *); 139 void *args; 140 }; 141 142 struct rt6_statistics { 143 __u32 fib_nodes; 144 __u32 fib_route_nodes; 145 __u32 fib_rt_alloc; /* permanent routes */ 146 __u32 fib_rt_entries; /* rt entries in table */ 147 __u32 fib_rt_cache; /* cache routes */ 148 __u32 fib_discarded_routes; 149 }; 150 151 #define RTN_TL_ROOT 0x0001 152 #define RTN_ROOT 0x0002 /* tree root node */ 153 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 154 155 /* 156 * priority levels (or metrics) 157 * 158 */ 159 160 161 struct fib6_table { 162 struct hlist_node tb6_hlist; 163 u32 tb6_id; 164 rwlock_t tb6_lock; 165 struct fib6_node tb6_root; 166 }; 167 168 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC 169 #define RT6_TABLE_MAIN RT_TABLE_MAIN 170 #define RT6_TABLE_DFLT RT6_TABLE_MAIN 171 #define RT6_TABLE_INFO RT6_TABLE_MAIN 172 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN 173 174 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 175 #define FIB6_TABLE_MIN 1 176 #define FIB6_TABLE_MAX RT_TABLE_MAX 177 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL 178 #else 179 #define FIB6_TABLE_MIN RT_TABLE_MAIN 180 #define FIB6_TABLE_MAX FIB6_TABLE_MIN 181 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN 182 #endif 183 184 typedef struct rt6_info *(*pol_lookup_t)(struct net *, 185 struct fib6_table *, 186 struct flowi6 *, int); 187 188 /* 189 * exported functions 190 */ 191 192 extern struct fib6_table *fib6_get_table(struct net *net, u32 id); 193 extern struct fib6_table *fib6_new_table(struct net *net, u32 id); 194 extern struct dst_entry *fib6_rule_lookup(struct net *net, 195 struct flowi6 *fl6, int flags, 196 pol_lookup_t lookup); 197 198 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 199 const struct in6_addr *daddr, 200 const struct in6_addr *saddr); 201 202 struct fib6_node *fib6_locate(struct fib6_node *root, 203 const struct in6_addr *daddr, int dst_len, 204 const struct in6_addr *saddr, int src_len); 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