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Linux/include/net/ip6_fib.h

  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 #include <linux/ipv6_route.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/spinlock.h>
 19 #include <net/dst.h>
 20 #include <net/flow.h>
 21 #include <net/netlink.h>
 22 #include <net/inetpeer.h>
 23 
 24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 25 #define FIB6_TABLE_HASHSZ 256
 26 #else
 27 #define FIB6_TABLE_HASHSZ 1
 28 #endif
 29 
 30 struct rt6_info;
 31 
 32 struct fib6_config {
 33         u32             fc_table;
 34         u32             fc_metric;
 35         int             fc_dst_len;
 36         int             fc_src_len;
 37         int             fc_ifindex;
 38         u32             fc_flags;
 39         u32             fc_protocol;
 40         u32             fc_type;        /* only 8 bits are used */
 41 
 42         struct in6_addr fc_dst;
 43         struct in6_addr fc_src;
 44         struct in6_addr fc_prefsrc;
 45         struct in6_addr fc_gateway;
 46 
 47         unsigned long   fc_expires;
 48         struct nlattr   *fc_mx;
 49         int             fc_mx_len;
 50         int             fc_mp_len;
 51         struct nlattr   *fc_mp;
 52 
 53         struct nl_info  fc_nlinfo;
 54 };
 55 
 56 struct fib6_node {
 57         struct fib6_node        *parent;
 58         struct fib6_node        *left;
 59         struct fib6_node        *right;
 60 #ifdef CONFIG_IPV6_SUBTREES
 61         struct fib6_node        *subtree;
 62 #endif
 63         struct rt6_info         *leaf;
 64 
 65         __u16                   fn_bit;         /* bit key */
 66         __u16                   fn_flags;
 67         int                     fn_sernum;
 68         struct rt6_info         *rr_ptr;
 69 };
 70 
 71 #ifndef CONFIG_IPV6_SUBTREES
 72 #define FIB6_SUBTREE(fn)        NULL
 73 #else
 74 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
 75 #endif
 76 
 77 struct mx6_config {
 78         const u32 *mx;
 79         DECLARE_BITMAP(mx_valid, RTAX_MAX);
 80 };
 81 
 82 /*
 83  *      routing information
 84  *
 85  */
 86 
 87 struct rt6key {
 88         struct in6_addr addr;
 89         int             plen;
 90 };
 91 
 92 struct fib6_table;
 93 
 94 struct rt6_info {
 95         struct dst_entry                dst;
 96 
 97         /*
 98          * Tail elements of dst_entry (__refcnt etc.)
 99          * and these elements (rarely used in hot path) are in
100          * the same cache line.
101          */
102         struct fib6_table               *rt6i_table;
103         struct fib6_node                *rt6i_node;
104 
105         struct in6_addr                 rt6i_gateway;
106 
107         /* Multipath routes:
108          * siblings is a list of rt6_info that have the the same metric/weight,
109          * destination, but not the same gateway. nsiblings is just a cache
110          * to speed up lookup.
111          */
112         struct list_head                rt6i_siblings;
113         unsigned int                    rt6i_nsiblings;
114 
115         atomic_t                        rt6i_ref;
116 
117         /* These are in a separate cache line. */
118         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
119         u32                             rt6i_flags;
120         struct rt6key                   rt6i_src;
121         struct rt6key                   rt6i_prefsrc;
122 
123         struct inet6_dev                *rt6i_idev;
124         unsigned long                   _rt6i_peer;
125 
126         u32                             rt6i_metric;
127         /* more non-fragment space at head required */
128         unsigned short                  rt6i_nfheader_len;
129         u8                              rt6i_protocol;
130 };
131 
132 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
133 {
134         return inetpeer_ptr(rt->_rt6i_peer);
135 }
136 
137 static inline bool rt6_has_peer(struct rt6_info *rt)
138 {
139         return inetpeer_ptr_is_peer(rt->_rt6i_peer);
140 }
141 
142 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
143 {
144         __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
145 }
146 
147 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
148 {
149         return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
150 }
151 
152 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
153 {
154         inetpeer_init_ptr(&rt->_rt6i_peer, base);
155 }
156 
157 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
158 {
159         inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
160 }
161 
162 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
163 {
164         return ((struct rt6_info *)dst)->rt6i_idev;
165 }
166 
167 static inline void rt6_clean_expires(struct rt6_info *rt)
168 {
169         rt->rt6i_flags &= ~RTF_EXPIRES;
170         rt->dst.expires = 0;
171 }
172 
173 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
174 {
175         rt->dst.expires = expires;
176         rt->rt6i_flags |= RTF_EXPIRES;
177 }
178 
179 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
180 {
181         struct rt6_info *rt;
182 
183         for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
184              rt = (struct rt6_info *)rt->dst.from);
185         if (rt && rt != rt0)
186                 rt0->dst.expires = rt->dst.expires;
187 
188         dst_set_expires(&rt0->dst, timeout);
189         rt0->rt6i_flags |= RTF_EXPIRES;
190 }
191 
192 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
193 {
194         struct dst_entry *new = (struct dst_entry *) from;
195 
196         rt->rt6i_flags &= ~RTF_EXPIRES;
197         dst_hold(new);
198         rt->dst.from = new;
199 }
200 
201 static inline void ip6_rt_put(struct rt6_info *rt)
202 {
203         /* dst_release() accepts a NULL parameter.
204          * We rely on dst being first structure in struct rt6_info
205          */
206         BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
207         dst_release(&rt->dst);
208 }
209 
210 enum fib6_walk_state {
211 #ifdef CONFIG_IPV6_SUBTREES
212         FWS_S,
213 #endif
214         FWS_L,
215         FWS_R,
216         FWS_C,
217         FWS_U
218 };
219 
220 struct fib6_walker {
221         struct list_head lh;
222         struct fib6_node *root, *node;
223         struct rt6_info *leaf;
224         enum fib6_walk_state state;
225         bool prune;
226         unsigned int skip;
227         unsigned int count;
228         int (*func)(struct fib6_walker *);
229         void *args;
230 };
231 
232 struct rt6_statistics {
233         __u32           fib_nodes;
234         __u32           fib_route_nodes;
235         __u32           fib_rt_alloc;           /* permanent routes     */
236         __u32           fib_rt_entries;         /* rt entries in table  */
237         __u32           fib_rt_cache;           /* cache routes         */
238         __u32           fib_discarded_routes;
239 };
240 
241 #define RTN_TL_ROOT     0x0001
242 #define RTN_ROOT        0x0002          /* tree root node               */
243 #define RTN_RTINFO      0x0004          /* node with valid routing info */
244 
245 /*
246  *      priority levels (or metrics)
247  *
248  */
249 
250 
251 struct fib6_table {
252         struct hlist_node       tb6_hlist;
253         u32                     tb6_id;
254         rwlock_t                tb6_lock;
255         struct fib6_node        tb6_root;
256         struct inet_peer_base   tb6_peers;
257 };
258 
259 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
260 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
261 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
262 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
263 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
264 
265 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
266 #define FIB6_TABLE_MIN          1
267 #define FIB6_TABLE_MAX          RT_TABLE_MAX
268 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
269 #else
270 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
271 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
272 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
273 #endif
274 
275 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
276                                          struct fib6_table *,
277                                          struct flowi6 *, int);
278 
279 /*
280  *      exported functions
281  */
282 
283 struct fib6_table *fib6_get_table(struct net *net, u32 id);
284 struct fib6_table *fib6_new_table(struct net *net, u32 id);
285 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
286                                    int flags, pol_lookup_t lookup);
287 
288 struct fib6_node *fib6_lookup(struct fib6_node *root,
289                               const struct in6_addr *daddr,
290                               const struct in6_addr *saddr);
291 
292 struct fib6_node *fib6_locate(struct fib6_node *root,
293                               const struct in6_addr *daddr, int dst_len,
294                               const struct in6_addr *saddr, int src_len);
295 
296 void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
297                     void *arg);
298 
299 int fib6_add(struct fib6_node *root, struct rt6_info *rt,
300              struct nl_info *info, struct mx6_config *mxc);
301 int fib6_del(struct rt6_info *rt, struct nl_info *info);
302 
303 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info);
304 
305 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
306 
307 void fib6_gc_cleanup(void);
308 
309 int fib6_init(void);
310 
311 int ipv6_route_open(struct inode *inode, struct file *file);
312 
313 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
314 int fib6_rules_init(void);
315 void fib6_rules_cleanup(void);
316 #else
317 static inline int               fib6_rules_init(void)
318 {
319         return 0;
320 }
321 static inline void              fib6_rules_cleanup(void)
322 {
323         return ;
324 }
325 #endif
326 #endif
327 

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