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 struct rt6_info; 26 27 struct fib6_config 28 { 29 u32 fc_table; 30 u32 fc_metric; 31 int fc_dst_len; 32 int fc_src_len; 33 int fc_ifindex; 34 u32 fc_flags; 35 u32 fc_protocol; 36 37 struct in6_addr fc_dst; 38 struct in6_addr fc_src; 39 struct in6_addr fc_gateway; 40 41 unsigned long fc_expires; 42 struct nlattr *fc_mx; 43 int fc_mx_len; 44 45 struct nl_info fc_nlinfo; 46 }; 47 48 struct fib6_node 49 { 50 struct fib6_node *parent; 51 struct fib6_node *left; 52 struct fib6_node *right; 53 #ifdef CONFIG_IPV6_SUBTREES 54 struct fib6_node *subtree; 55 #endif 56 struct rt6_info *leaf; 57 58 __u16 fn_bit; /* bit key */ 59 __u16 fn_flags; 60 __u32 fn_sernum; 61 struct rt6_info *rr_ptr; 62 }; 63 64 #ifndef CONFIG_IPV6_SUBTREES 65 #define FIB6_SUBTREE(fn) NULL 66 #else 67 #define FIB6_SUBTREE(fn) ((fn)->subtree) 68 #endif 69 70 /* 71 * routing information 72 * 73 */ 74 75 struct rt6key 76 { 77 struct in6_addr addr; 78 int plen; 79 }; 80 81 struct fib6_table; 82 83 struct rt6_info 84 { 85 union { 86 struct dst_entry dst; 87 } u; 88 89 struct inet6_dev *rt6i_idev; 90 91 #define rt6i_dev u.dst.dev 92 #define rt6i_nexthop u.dst.neighbour 93 #define rt6i_expires u.dst.expires 94 95 struct fib6_node *rt6i_node; 96 97 struct in6_addr rt6i_gateway; 98 99 u32 rt6i_flags; 100 u32 rt6i_metric; 101 atomic_t rt6i_ref; 102 struct fib6_table *rt6i_table; 103 104 struct rt6key rt6i_dst; 105 struct rt6key rt6i_src; 106 107 u8 rt6i_protocol; 108 }; 109 110 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 111 { 112 return ((struct rt6_info *)dst)->rt6i_idev; 113 } 114 115 struct fib6_walker_t 116 { 117 struct fib6_walker_t *prev, *next; 118 struct fib6_node *root, *node; 119 struct rt6_info *leaf; 120 unsigned char state; 121 unsigned char prune; 122 int (*func)(struct fib6_walker_t *); 123 void *args; 124 }; 125 126 struct rt6_statistics { 127 __u32 fib_nodes; 128 __u32 fib_route_nodes; 129 __u32 fib_rt_alloc; /* permanent routes */ 130 __u32 fib_rt_entries; /* rt entries in table */ 131 __u32 fib_rt_cache; /* cache routes */ 132 __u32 fib_discarded_routes; 133 }; 134 135 #define RTN_TL_ROOT 0x0001 136 #define RTN_ROOT 0x0002 /* tree root node */ 137 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 138 139 /* 140 * priority levels (or metrics) 141 * 142 */ 143 144 #define RTPRI_FIREWALL 8 /* Firewall control information */ 145 #define RTPRI_FLOW 16 /* Flow based forwarding rules */ 146 #define RTPRI_KERN_CTL 32 /* Kernel control routes */ 147 148 #define RTPRI_USER_MIN 256 /* Mimimum user priority */ 149 #define RTPRI_USER_MAX 1024 /* Maximum user priority */ 150 151 #define RTPRI_KERN_DFLT 4096 /* Kernel default routes */ 152 153 #define MAX_FLOW_BACKTRACE 32 154 155 156 typedef void (*f_pnode)(struct fib6_node *fn, void *); 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 fib6_table *, 182 struct flowi *, int); 183 184 /* 185 * exported functions 186 */ 187 188 extern struct fib6_table * fib6_get_table(u32 id); 189 extern struct fib6_table * fib6_new_table(u32 id); 190 extern struct dst_entry * fib6_rule_lookup(struct flowi *fl, int flags, 191 pol_lookup_t lookup); 192 193 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 194 struct in6_addr *daddr, 195 struct in6_addr *saddr); 196 197 struct fib6_node *fib6_locate(struct fib6_node *root, 198 struct in6_addr *daddr, int dst_len, 199 struct in6_addr *saddr, int src_len); 200 201 extern void fib6_clean_all(int (*func)(struct rt6_info *, void *arg), 202 int prune, void *arg); 203 204 extern int fib6_add(struct fib6_node *root, 205 struct rt6_info *rt, 206 struct nl_info *info); 207 208 extern int fib6_del(struct rt6_info *rt, 209 struct nl_info *info); 210 211 extern void inet6_rt_notify(int event, struct rt6_info *rt, 212 struct nl_info *info); 213 214 extern void fib6_run_gc(unsigned long dummy); 215 216 extern void fib6_gc_cleanup(void); 217 218 extern void fib6_init(void); 219 220 extern void fib6_rules_init(void); 221 extern void fib6_rules_cleanup(void); 222 223 #endif 224 #endif 225