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; 102 103 /* more non-fragment space at head required */ 104 unsigned short rt6i_nfheader_len; 105 106 u8 rt6i_protocol; 107 108 struct fib6_table *rt6i_table; 109 110 struct rt6key rt6i_dst; 111 112 #ifdef CONFIG_XFRM 113 u32 rt6i_flow_cache_genid; 114 #endif 115 116 struct rt6key rt6i_src; 117 }; 118 119 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 120 { 121 return ((struct rt6_info *)dst)->rt6i_idev; 122 } 123 124 struct fib6_walker_t 125 { 126 struct fib6_walker_t *prev, *next; 127 struct fib6_node *root, *node; 128 struct rt6_info *leaf; 129 unsigned char state; 130 unsigned char prune; 131 int (*func)(struct fib6_walker_t *); 132 void *args; 133 }; 134 135 struct rt6_statistics { 136 __u32 fib_nodes; 137 __u32 fib_route_nodes; 138 __u32 fib_rt_alloc; /* permanent routes */ 139 __u32 fib_rt_entries; /* rt entries in table */ 140 __u32 fib_rt_cache; /* cache routes */ 141 __u32 fib_discarded_routes; 142 }; 143 144 #define RTN_TL_ROOT 0x0001 145 #define RTN_ROOT 0x0002 /* tree root node */ 146 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 147 148 /* 149 * priority levels (or metrics) 150 * 151 */ 152 153 #define RTPRI_FIREWALL 8 /* Firewall control information */ 154 #define RTPRI_FLOW 16 /* Flow based forwarding rules */ 155 #define RTPRI_KERN_CTL 32 /* Kernel control routes */ 156 157 #define RTPRI_USER_MIN 256 /* Mimimum user priority */ 158 #define RTPRI_USER_MAX 1024 /* Maximum user priority */ 159 160 #define RTPRI_KERN_DFLT 4096 /* Kernel default routes */ 161 162 #define MAX_FLOW_BACKTRACE 32 163 164 165 typedef void (*f_pnode)(struct fib6_node *fn, void *); 166 167 struct fib6_table { 168 struct hlist_node tb6_hlist; 169 u32 tb6_id; 170 rwlock_t tb6_lock; 171 struct fib6_node tb6_root; 172 }; 173 174 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC 175 #define RT6_TABLE_MAIN RT_TABLE_MAIN 176 #define RT6_TABLE_DFLT RT6_TABLE_MAIN 177 #define RT6_TABLE_INFO RT6_TABLE_MAIN 178 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN 179 180 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 181 #define FIB6_TABLE_MIN 1 182 #define FIB6_TABLE_MAX RT_TABLE_MAX 183 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL 184 #else 185 #define FIB6_TABLE_MIN RT_TABLE_MAIN 186 #define FIB6_TABLE_MAX FIB6_TABLE_MIN 187 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN 188 #endif 189 190 typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *, 191 struct flowi *, int); 192 193 /* 194 * exported functions 195 */ 196 197 extern struct fib6_table * fib6_get_table(u32 id); 198 extern struct fib6_table * fib6_new_table(u32 id); 199 extern struct dst_entry * fib6_rule_lookup(struct flowi *fl, int flags, 200 pol_lookup_t lookup); 201 202 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 203 struct in6_addr *daddr, 204 struct in6_addr *saddr); 205 206 struct fib6_node *fib6_locate(struct fib6_node *root, 207 struct in6_addr *daddr, int dst_len, 208 struct in6_addr *saddr, int src_len); 209 210 extern void fib6_clean_all(int (*func)(struct rt6_info *, void *arg), 211 int prune, void *arg); 212 213 extern int fib6_add(struct fib6_node *root, 214 struct rt6_info *rt, 215 struct nl_info *info); 216 217 extern int fib6_del(struct rt6_info *rt, 218 struct nl_info *info); 219 220 extern void inet6_rt_notify(int event, struct rt6_info *rt, 221 struct nl_info *info); 222 223 extern void fib6_run_gc(unsigned long dummy); 224 225 extern void fib6_gc_cleanup(void); 226 227 extern int fib6_init(void); 228 229 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 230 extern int fib6_rules_init(void); 231 extern void fib6_rules_cleanup(void); 232 #else 233 static inline int fib6_rules_init(void) 234 { 235 return 0; 236 } 237 static inline void fib6_rules_cleanup(void) 238 { 239 return ; 240 } 241 #endif 242 #endif 243 #endif 244