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 20 #include <net/dst.h> 21 #include <net/flow.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/spinlock.h> 24 25 struct rt6_info; 26 27 struct fib6_node 28 { 29 struct fib6_node *parent; 30 struct fib6_node *left; 31 struct fib6_node *right; 32 33 struct fib6_node *subtree; 34 35 struct rt6_info *leaf; 36 37 __u16 fn_bit; /* bit key */ 38 __u16 fn_flags; 39 __u32 fn_sernum; 40 }; 41 42 43 /* 44 * routing information 45 * 46 */ 47 48 struct rt6key 49 { 50 struct in6_addr addr; 51 int plen; 52 }; 53 54 struct rt6_info 55 { 56 union { 57 struct dst_entry dst; 58 struct rt6_info *next; 59 } u; 60 61 struct inet6_dev *rt6i_idev; 62 63 #define rt6i_dev u.dst.dev 64 #define rt6i_nexthop u.dst.neighbour 65 #define rt6i_expires u.dst.expires 66 67 struct fib6_node *rt6i_node; 68 69 struct in6_addr rt6i_gateway; 70 71 u32 rt6i_flags; 72 u32 rt6i_metric; 73 atomic_t rt6i_ref; 74 75 struct rt6key rt6i_dst; 76 struct rt6key rt6i_src; 77 78 u8 rt6i_protocol; 79 }; 80 81 struct fib6_walker_t 82 { 83 struct fib6_walker_t *prev, *next; 84 struct fib6_node *root, *node; 85 struct rt6_info *leaf; 86 unsigned char state; 87 unsigned char prune; 88 int (*func)(struct fib6_walker_t *); 89 void *args; 90 }; 91 92 extern struct fib6_walker_t fib6_walker_list; 93 extern rwlock_t fib6_walker_lock; 94 95 static inline void fib6_walker_link(struct fib6_walker_t *w) 96 { 97 write_lock_bh(&fib6_walker_lock); 98 w->next = fib6_walker_list.next; 99 w->prev = &fib6_walker_list; 100 w->next->prev = w; 101 w->prev->next = w; 102 write_unlock_bh(&fib6_walker_lock); 103 } 104 105 static inline void fib6_walker_unlink(struct fib6_walker_t *w) 106 { 107 write_lock_bh(&fib6_walker_lock); 108 w->next->prev = w->prev; 109 w->prev->next = w->next; 110 w->prev = w->next = w; 111 write_unlock_bh(&fib6_walker_lock); 112 } 113 114 struct rt6_statistics { 115 __u32 fib_nodes; 116 __u32 fib_route_nodes; 117 __u32 fib_rt_alloc; /* permanent routes */ 118 __u32 fib_rt_entries; /* rt entries in table */ 119 __u32 fib_rt_cache; /* cache routes */ 120 __u32 fib_discarded_routes; 121 }; 122 123 #define RTN_TL_ROOT 0x0001 124 #define RTN_ROOT 0x0002 /* tree root node */ 125 #define RTN_RTINFO 0x0004 /* node with valid routing info */ 126 127 /* 128 * priority levels (or metrics) 129 * 130 */ 131 132 #define RTPRI_FIREWALL 8 /* Firewall control information */ 133 #define RTPRI_FLOW 16 /* Flow based forwarding rules */ 134 #define RTPRI_KERN_CTL 32 /* Kernel control routes */ 135 136 #define RTPRI_USER_MIN 256 /* Mimimum user priority */ 137 #define RTPRI_USER_MAX 1024 /* Maximum user priority */ 138 139 #define RTPRI_KERN_DFLT 4096 /* Kernel default routes */ 140 141 #define MAX_FLOW_BACKTRACE 32 142 143 144 typedef void (*f_pnode)(struct fib6_node *fn, void *); 145 146 extern struct fib6_node ip6_routing_table; 147 148 /* 149 * exported functions 150 */ 151 152 extern struct fib6_node *fib6_lookup(struct fib6_node *root, 153 struct in6_addr *daddr, 154 struct in6_addr *saddr); 155 156 struct fib6_node *fib6_locate(struct fib6_node *root, 157 struct in6_addr *daddr, int dst_len, 158 struct in6_addr *saddr, int src_len); 159 160 extern void fib6_clean_tree(struct fib6_node *root, 161 int (*func)(struct rt6_info *, void *arg), 162 int prune, void *arg); 163 164 extern int fib6_walk(struct fib6_walker_t *w); 165 extern int fib6_walk_continue(struct fib6_walker_t *w); 166 167 extern int fib6_add(struct fib6_node *root, 168 struct rt6_info *rt, 169 struct nlmsghdr *nlh, 170 void *rtattr, 171 struct netlink_skb_parms *req); 172 173 extern int fib6_del(struct rt6_info *rt, 174 struct nlmsghdr *nlh, 175 void *rtattr, 176 struct netlink_skb_parms *req); 177 178 extern void inet6_rt_notify(int event, struct rt6_info *rt, 179 struct nlmsghdr *nlh, 180 struct netlink_skb_parms *req); 181 182 extern void fib6_run_gc(unsigned long dummy); 183 184 extern void fib6_gc_cleanup(void); 185 186 extern void fib6_init(void); 187 #endif 188 #endif 189