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 #include <net/inetpeer.h> 25 26 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 27 #define FIB6_TABLE_HASHSZ 256 28 #else 29 #define FIB6_TABLE_HASHSZ 1 30 #endif 31 32 struct rt6_info; 33 34 struct fib6_config { 35 u32 fc_table; 36 u32 fc_metric; 37 int fc_dst_len; 38 int fc_src_len; 39 int fc_ifindex; 40 u32 fc_flags; 41 u32 fc_protocol; 42 43 struct in6_addr fc_dst; 44 struct in6_addr fc_src; 45 struct in6_addr fc_gateway; 46 47 unsigned long fc_expires; 48 struct nlattr *fc_mx; 49 int fc_mx_len; 50 51 struct nl_info fc_nlinfo; 52 }; 53 54 struct fib6_node { 55 struct fib6_node *parent; 56 struct fib6_node *left; 57 struct fib6_node *right; 58 #ifdef CONFIG_IPV6_SUBTREES 59 struct fib6_node *subtree; 60 #endif 61 struct rt6_info *leaf; 62 63 __u16 fn_bit; /* bit key */ 64 __u16 fn_flags; 65 __u32 fn_sernum; 66 struct rt6_info *rr_ptr; 67 }; 68 69 #ifndef CONFIG_IPV6_SUBTREES 70 #define FIB6_SUBTREE(fn) NULL 71 #else 72 #define FIB6_SUBTREE(fn) ((fn)->subtree) 73 #endif 74 75 /* 76 * routing information 77 * 78 */ 79 80 struct rt6key { 81 struct in6_addr addr; 82 int plen; 83 }; 84 85 struct fib6_table; 86 87 struct rt6_info { 88 struct dst_entry dst; 89 90 #define rt6i_dev dst.dev 91 #define rt6i_nexthop dst.neighbour 92 #define rt6i_expires dst.expires 93 94 /* 95 * Tail elements of dst_entry (__refcnt etc.) 96 * and these elements (rarely used in hot path) are in 97 * the same cache line. 98 */ 99 struct fib6_table *rt6i_table; 100 struct fib6_node *rt6i_node; 101 102 struct in6_addr rt6i_gateway; 103 104 atomic_t rt6i_ref; 105 106 /* These are in a separate cache line. */ 107 struct rt6key rt6i_dst ____cacheline_aligned_in_smp; 108 u32 rt6i_flags; 109 struct rt6key rt6i_src; 110 u32 rt6i_metric; 111 112 struct inet6_dev *rt6i_idev; 113 struct inet_peer *rt6i_peer; 114 115 #ifdef CONFIG_XFRM 116 u32 rt6i_flow_cache_genid; 117 #endif 118 /* more non-fragment space at head required */ 119 unsigned short rt6i_nfheader_len; 120 121 u8 rt6i_protocol; 122 }; 123 124 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 125 { 126 return ((struct rt6_info *)dst)->rt6i_idev; 127 } 128 129 struct fib6_walker_t { 130 struct list_head lh; 131 struct fib6_node *root, *node; 132 struct rt6_info *leaf; 133 unsigned char state; 134 unsigned char prune; 135 unsigned int skip; 136 unsigned int count; 137 int (*func)(struct fib6_walker_t *); 138 void *args; 139 }; 140 141 struct rt6_statistics { 142 __u32 fib_nodes; 143 __u32 fib_route_nodes; 144 __u32 fib_rt_alloc; /* permanent routes */ 145 __u32 fib_rt_entries; /* rt entries in table */ 146 __u32 fib_rt_cache; /* cache routes */ 147 __u32 fib_discarded_routes; 148 }; 149 150 #define RTN_TL_ROOT 0x0001 151 #define RTN_ROOT 0x0002 /* tree root node */ 152 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 153 154 /* 155 * priority levels (or metrics) 156 * 157 */ 158 159 160 struct fib6_table { 161 struct hlist_node tb6_hlist; 162 u32 tb6_id; 163 rwlock_t tb6_lock; 164 struct fib6_node tb6_root; 165 }; 166 167 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC 168 #define RT6_TABLE_MAIN RT_TABLE_MAIN 169 #define RT6_TABLE_DFLT RT6_TABLE_MAIN 170 #define RT6_TABLE_INFO RT6_TABLE_MAIN 171 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN 172 173 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 174 #define FIB6_TABLE_MIN 1 175 #define FIB6_TABLE_MAX RT_TABLE_MAX 176 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL 177 #else 178 #define FIB6_TABLE_MIN RT_TABLE_MAIN 179 #define FIB6_TABLE_MAX FIB6_TABLE_MIN 180 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN 181 #endif 182 183 typedef struct rt6_info *(*pol_lookup_t)(struct net *, 184 struct fib6_table *, 185 struct flowi *, int); 186 187 /* 188 * exported functions 189 */ 190 191 extern struct fib6_table *fib6_get_table(struct net *net, u32 id); 192 extern struct fib6_table *fib6_new_table(struct net *net, u32 id); 193 extern struct dst_entry *fib6_rule_lookup(struct net *net, 194 struct flowi *fl, int flags, 195 pol_lookup_t lookup); 196 197 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 198 struct in6_addr *daddr, 199 struct in6_addr *saddr); 200 201 struct fib6_node *fib6_locate(struct fib6_node *root, 202 struct in6_addr *daddr, int dst_len, 203 struct in6_addr *saddr, int src_len); 204 205 extern void fib6_clean_all(struct net *net, 206 int (*func)(struct rt6_info *, void *arg), 207 int prune, void *arg); 208 209 extern int fib6_add(struct fib6_node *root, 210 struct rt6_info *rt, 211 struct nl_info *info); 212 213 extern int fib6_del(struct rt6_info *rt, 214 struct nl_info *info); 215 216 extern void inet6_rt_notify(int event, struct rt6_info *rt, 217 struct nl_info *info); 218 219 extern void fib6_run_gc(unsigned long expires, 220 struct net *net); 221 222 extern void fib6_gc_cleanup(void); 223 224 extern int fib6_init(void); 225 226 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 227 extern int fib6_rules_init(void); 228 extern void fib6_rules_cleanup(void); 229 #else 230 static inline int fib6_rules_init(void) 231 { 232 return 0; 233 } 234 static inline void fib6_rules_cleanup(void) 235 { 236 return ; 237 } 238 #endif 239 #endif 240 #endif 241