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Linux/include/net/ip6_fib.h

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  1 /*
  2  *      Linux INET6 implementation 
  3  *
  4  *      Authors:
  5  *      Pedro Roque             <pedro_m@yahoo.com>     
  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 
 24 struct rt6_info;
 25 
 26 struct fib6_node
 27 {
 28         struct fib6_node        *parent;
 29         struct fib6_node        *left;
 30         struct fib6_node        *right;
 31 
 32         struct fib6_node        *subtree;
 33 
 34         struct rt6_info         *leaf;
 35 
 36         __u16                   fn_bit;         /* bit key */
 37         __u16                   fn_flags;
 38         __u32                   fn_sernum;
 39 };
 40 
 41 
 42 /*
 43  *      routing information
 44  *
 45  */
 46 
 47 struct rt6key
 48 {
 49         struct in6_addr addr;
 50         int             plen;
 51 };
 52 
 53 struct rt6_info
 54 {
 55         union {
 56                 struct dst_entry        dst;
 57                 struct rt6_info         *next;
 58         } u;
 59 
 60 #define rt6i_dev                        u.dst.dev
 61 #define rt6i_nexthop                    u.dst.neighbour
 62 #define rt6i_expires                    u.dst.expires
 63 
 64         struct fib6_node                *rt6i_node;
 65 
 66         struct in6_addr                 rt6i_gateway;
 67         
 68         u32                             rt6i_flags;
 69         u32                             rt6i_metric;
 70         u8                              rt6i_hoplimit;
 71         atomic_t                        rt6i_ref;
 72 
 73         union {
 74                 struct flow_rule        *rt6iu_flowr;
 75                 struct flow_filter      *rt6iu_filter;
 76         } flow_u;
 77 
 78 #define rt6i_flowr                      flow_u.rt6iu_flowr
 79 #define rt6i_filter                     flow_u.rt6iu_filter
 80 
 81         struct rt6key                   rt6i_dst;
 82         struct rt6key                   rt6i_src;
 83 
 84         u8                              rt6i_protocol;
 85 };
 86 
 87 struct fib6_walker_t
 88 {
 89         struct fib6_walker_t *prev, *next;
 90         struct fib6_node *root, *node;
 91         struct rt6_info *leaf;
 92         unsigned char state;
 93         unsigned char prune;
 94         int (*func)(struct fib6_walker_t *);
 95         void *args;
 96 };
 97 
 98 extern struct fib6_walker_t fib6_walker_list;
 99 extern rwlock_t fib6_walker_lock;
100 
101 static inline void fib6_walker_link(struct fib6_walker_t *w)
102 {
103         write_lock_bh(&fib6_walker_lock);
104         w->next = fib6_walker_list.next;
105         w->prev = &fib6_walker_list;
106         w->next->prev = w;
107         w->prev->next = w;
108         write_unlock_bh(&fib6_walker_lock);
109 }
110 
111 static inline void fib6_walker_unlink(struct fib6_walker_t *w)
112 {
113         write_lock_bh(&fib6_walker_lock);
114         w->next->prev = w->prev;
115         w->prev->next = w->next;
116         w->prev = w->next = w;
117         write_unlock_bh(&fib6_walker_lock);
118 }
119 
120 struct rt6_statistics {
121         __u32           fib_nodes;
122         __u32           fib_route_nodes;
123         __u32           fib_rt_alloc;           /* permanent routes     */
124         __u32           fib_rt_entries;         /* rt entries in table  */
125         __u32           fib_rt_cache;           /* cache routes         */
126 };
127 
128 #define RTN_TL_ROOT     0x0001
129 #define RTN_ROOT        0x0002          /* tree root node               */
130 #define RTN_RTINFO      0x0004          /* node with valid routing info */
131 
132 /*
133  *      priority levels (or metrics)
134  *
135  */
136 
137 #define RTPRI_FIREWALL  8               /* Firewall control information */
138 #define RTPRI_FLOW      16              /* Flow based forwarding rules  */
139 #define RTPRI_KERN_CTL  32              /* Kernel control routes        */
140 
141 #define RTPRI_USER_MIN  256             /* Mimimum user priority        */
142 #define RTPRI_USER_MAX  1024            /* Maximum user priority        */
143 
144 #define RTPRI_KERN_DFLT 4096            /* Kernel default routes        */
145 
146 #define MAX_FLOW_BACKTRACE      32
147 
148 
149 typedef void                    (*f_pnode)(struct fib6_node *fn, void *);
150 
151 extern struct fib6_node         ip6_routing_table;
152 
153 /*
154  *      exported functions
155  */
156 
157 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
158                                              struct in6_addr *daddr,
159                                              struct in6_addr *saddr);
160 
161 struct fib6_node                *fib6_locate(struct fib6_node *root,
162                                              struct in6_addr *daddr, int dst_len,
163                                              struct in6_addr *saddr, int src_len);
164 
165 extern void                     fib6_clean_tree(struct fib6_node *root,
166                                                 int (*func)(struct rt6_info *, void *arg),
167                                                 int prune, void *arg);
168 
169 extern int                      fib6_walk(struct fib6_walker_t *w);
170 extern int                      fib6_walk_continue(struct fib6_walker_t *w);
171 
172 extern int                      fib6_add(struct fib6_node *root,
173                                          struct rt6_info *rt,
174                                          struct nlmsghdr *nlh,
175                                          struct netlink_skb_parms *req);
176 
177 extern int                      fib6_del(struct rt6_info *rt,
178                                          struct nlmsghdr *nlh,
179                                          struct netlink_skb_parms *req);
180 
181 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
182                                                 struct nlmsghdr *nlh,
183                                                 struct netlink_skb_parms *req);
184 
185 extern void                     fib6_run_gc(unsigned long dummy);
186 
187 extern void                     fib6_gc_cleanup(void);
188 
189 extern void                     fib6_init(void);
190 #endif
191 #endif
192 

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