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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         __u32                   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 /*
 78  *      routing information
 79  *
 80  */
 81 
 82 struct rt6key {
 83         struct in6_addr addr;
 84         int             plen;
 85 };
 86 
 87 struct fib6_table;
 88 
 89 struct rt6_info {
 90         struct dst_entry                dst;
 91 
 92         /*
 93          * Tail elements of dst_entry (__refcnt etc.)
 94          * and these elements (rarely used in hot path) are in
 95          * the same cache line.
 96          */
 97         struct fib6_table               *rt6i_table;
 98         struct fib6_node                *rt6i_node;
 99 
100         struct in6_addr                 rt6i_gateway;
101 
102         /* Multipath routes:
103          * siblings is a list of rt6_info that have the the same metric/weight,
104          * destination, but not the same gateway. nsiblings is just a cache
105          * to speed up lookup.
106          */
107         struct list_head                rt6i_siblings;
108         unsigned int                    rt6i_nsiblings;
109 
110         atomic_t                        rt6i_ref;
111 
112         /* These are in a separate cache line. */
113         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
114         u32                             rt6i_flags;
115         struct rt6key                   rt6i_src;
116         struct rt6key                   rt6i_prefsrc;
117         u32                             rt6i_metric;
118 
119         struct inet6_dev                *rt6i_idev;
120         unsigned long                   _rt6i_peer;
121 
122         u32                             rt6i_genid;
123 
124         /* more non-fragment space at head required */
125         unsigned short                  rt6i_nfheader_len;
126 
127         u8                              rt6i_protocol;
128 };
129 
130 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
131 {
132         return inetpeer_ptr(rt->_rt6i_peer);
133 }
134 
135 static inline bool rt6_has_peer(struct rt6_info *rt)
136 {
137         return inetpeer_ptr_is_peer(rt->_rt6i_peer);
138 }
139 
140 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
141 {
142         __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
143 }
144 
145 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
146 {
147         return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
148 }
149 
150 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
151 {
152         inetpeer_init_ptr(&rt->_rt6i_peer, base);
153 }
154 
155 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
156 {
157         inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
158 }
159 
160 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
161 {
162         return ((struct rt6_info *)dst)->rt6i_idev;
163 }
164 
165 static inline void rt6_clean_expires(struct rt6_info *rt)
166 {
167         rt->rt6i_flags &= ~RTF_EXPIRES;
168         rt->dst.expires = 0;
169 }
170 
171 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
172 {
173         rt->dst.expires = expires;
174         rt->rt6i_flags |= RTF_EXPIRES;
175 }
176 
177 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
178 {
179         struct rt6_info *rt;
180 
181         for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
182              rt = (struct rt6_info *)rt->dst.from);
183         if (rt && rt != rt0)
184                 rt0->dst.expires = rt->dst.expires;
185 
186         dst_set_expires(&rt0->dst, timeout);
187         rt0->rt6i_flags |= RTF_EXPIRES;
188 }
189 
190 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
191 {
192         struct dst_entry *new = (struct dst_entry *) from;
193 
194         rt->rt6i_flags &= ~RTF_EXPIRES;
195         dst_hold(new);
196         rt->dst.from = new;
197 }
198 
199 static inline void ip6_rt_put(struct rt6_info *rt)
200 {
201         /* dst_release() accepts a NULL parameter.
202          * We rely on dst being first structure in struct rt6_info
203          */
204         BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
205         dst_release(&rt->dst);
206 }
207 
208 struct fib6_walker_t {
209         struct list_head lh;
210         struct fib6_node *root, *node;
211         struct rt6_info *leaf;
212         unsigned char state;
213         unsigned char prune;
214         unsigned int skip;
215         unsigned int count;
216         int (*func)(struct fib6_walker_t *);
217         void *args;
218 };
219 
220 struct rt6_statistics {
221         __u32           fib_nodes;
222         __u32           fib_route_nodes;
223         __u32           fib_rt_alloc;           /* permanent routes     */
224         __u32           fib_rt_entries;         /* rt entries in table  */
225         __u32           fib_rt_cache;           /* cache routes         */
226         __u32           fib_discarded_routes;
227 };
228 
229 #define RTN_TL_ROOT     0x0001
230 #define RTN_ROOT        0x0002          /* tree root node               */
231 #define RTN_RTINFO      0x0004          /* node with valid routing info */
232 
233 /*
234  *      priority levels (or metrics)
235  *
236  */
237 
238 
239 struct fib6_table {
240         struct hlist_node       tb6_hlist;
241         u32                     tb6_id;
242         rwlock_t                tb6_lock;
243         struct fib6_node        tb6_root;
244         struct inet_peer_base   tb6_peers;
245 };
246 
247 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
248 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
249 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
250 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
251 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
252 
253 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
254 #define FIB6_TABLE_MIN          1
255 #define FIB6_TABLE_MAX          RT_TABLE_MAX
256 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
257 #else
258 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
259 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
260 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
261 #endif
262 
263 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
264                                          struct fib6_table *,
265                                          struct flowi6 *, int);
266 
267 /*
268  *      exported functions
269  */
270 
271 struct fib6_table *fib6_get_table(struct net *net, u32 id);
272 struct fib6_table *fib6_new_table(struct net *net, u32 id);
273 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
274                                    int flags, pol_lookup_t lookup);
275 
276 struct fib6_node *fib6_lookup(struct fib6_node *root,
277                               const struct in6_addr *daddr,
278                               const struct in6_addr *saddr);
279 
280 struct fib6_node *fib6_locate(struct fib6_node *root,
281                               const struct in6_addr *daddr, int dst_len,
282                               const struct in6_addr *saddr, int src_len);
283 
284 void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
285                     void *arg);
286 
287 int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info,
288              struct nlattr *mx, int mx_len);
289 
290 int fib6_del(struct rt6_info *rt, struct nl_info *info);
291 
292 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info);
293 
294 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
295 
296 void fib6_gc_cleanup(void);
297 
298 int fib6_init(void);
299 
300 int ipv6_route_open(struct inode *inode, struct file *file);
301 
302 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
303 int fib6_rules_init(void);
304 void fib6_rules_cleanup(void);
305 #else
306 static inline int               fib6_rules_init(void)
307 {
308         return 0;
309 }
310 static inline void              fib6_rules_cleanup(void)
311 {
312         return ;
313 }
314 #endif
315 #endif
316 

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