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 #ifdef __KERNEL__ 17 18 #include <linux/ipv6_route.h> 19 #include <linux/rtnetlink.h> 20 #include <linux/spinlock.h> 21 #include <net/dst.h> 22 #include <net/flow.h> 23 #include <net/netlink.h> 24 25 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 26 #define FIB6_TABLE_HASHSZ 256 27 #else 28 #define FIB6_TABLE_HASHSZ 1 29 #endif 30 31 struct rt6_info; 32 33 struct fib6_config { 34 u32 fc_table; 35 u32 fc_metric; 36 int fc_dst_len; 37 int fc_src_len; 38 int fc_ifindex; 39 u32 fc_flags; 40 u32 fc_protocol; 41 42 struct in6_addr fc_dst; 43 struct in6_addr fc_src; 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 u32 rt6i_metric; 110 111 struct inet6_dev *rt6i_idev; 112 113 #ifdef CONFIG_XFRM 114 u32 rt6i_flow_cache_genid; 115 #endif 116 /* more non-fragment space at head required */ 117 unsigned short rt6i_nfheader_len; 118 119 u8 rt6i_protocol; 120 }; 121 122 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 123 { 124 return ((struct rt6_info *)dst)->rt6i_idev; 125 } 126 127 struct fib6_walker_t { 128 struct list_head lh; 129 struct fib6_node *root, *node; 130 struct rt6_info *leaf; 131 unsigned char state; 132 unsigned char prune; 133 unsigned int skip; 134 unsigned int count; 135 int (*func)(struct fib6_walker_t *); 136 void *args; 137 }; 138 139 struct rt6_statistics { 140 __u32 fib_nodes; 141 __u32 fib_route_nodes; 142 __u32 fib_rt_alloc; /* permanent routes */ 143 __u32 fib_rt_entries; /* rt entries in table */ 144 __u32 fib_rt_cache; /* cache routes */ 145 __u32 fib_discarded_routes; 146 }; 147 148 #define RTN_TL_ROOT 0x0001 149 #define RTN_ROOT 0x0002 /* tree root node */ 150 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 151 152 /* 153 * priority levels (or metrics) 154 * 155 */ 156 157 158 struct fib6_table { 159 struct hlist_node tb6_hlist; 160 u32 tb6_id; 161 rwlock_t tb6_lock; 162 struct fib6_node tb6_root; 163 }; 164 165 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC 166 #define RT6_TABLE_MAIN RT_TABLE_MAIN 167 #define RT6_TABLE_DFLT RT6_TABLE_MAIN 168 #define RT6_TABLE_INFO RT6_TABLE_MAIN 169 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN 170 171 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 172 #define FIB6_TABLE_MIN 1 173 #define FIB6_TABLE_MAX RT_TABLE_MAX 174 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL 175 #else 176 #define FIB6_TABLE_MIN RT_TABLE_MAIN 177 #define FIB6_TABLE_MAX FIB6_TABLE_MIN 178 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN 179 #endif 180 181 typedef struct rt6_info *(*pol_lookup_t)(struct net *, 182 struct fib6_table *, 183 struct flowi *, int); 184 185 /* 186 * exported functions 187 */ 188 189 extern struct fib6_table *fib6_get_table(struct net *net, u32 id); 190 extern struct fib6_table *fib6_new_table(struct net *net, u32 id); 191 extern struct dst_entry *fib6_rule_lookup(struct net *net, 192 struct flowi *fl, int flags, 193 pol_lookup_t lookup); 194 195 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 196 struct in6_addr *daddr, 197 struct in6_addr *saddr); 198 199 struct fib6_node *fib6_locate(struct fib6_node *root, 200 struct in6_addr *daddr, int dst_len, 201 struct in6_addr *saddr, int src_len); 202 203 extern void fib6_clean_all(struct net *net, 204 int (*func)(struct rt6_info *, void *arg), 205 int prune, void *arg); 206 207 extern int fib6_add(struct fib6_node *root, 208 struct rt6_info *rt, 209 struct nl_info *info); 210 211 extern int fib6_del(struct rt6_info *rt, 212 struct nl_info *info); 213 214 extern void inet6_rt_notify(int event, struct rt6_info *rt, 215 struct nl_info *info); 216 217 extern void fib6_run_gc(unsigned long expires, 218 struct net *net); 219 220 extern void fib6_gc_cleanup(void); 221 222 extern int fib6_init(void); 223 224 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 225 extern int fib6_rules_init(void); 226 extern void fib6_rules_cleanup(void); 227 #else 228 static inline int fib6_rules_init(void) 229 { 230 return 0; 231 } 232 static inline void fib6_rules_cleanup(void) 233 { 234 return ; 235 } 236 #endif 237 #endif 238 #endif 239