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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 list_head                rt6i_uncached;
124         struct uncached_list            *rt6i_uncached_list;
125 
126         struct inet6_dev                *rt6i_idev;
127         struct rt6_info * __percpu      *rt6i_pcpu;
128 
129         u32                             rt6i_metric;
130         u32                             rt6i_pmtu;
131         /* more non-fragment space at head required */
132         unsigned short                  rt6i_nfheader_len;
133         u8                              rt6i_protocol;
134 };
135 
136 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
137 {
138         return ((struct rt6_info *)dst)->rt6i_idev;
139 }
140 
141 static inline void rt6_clean_expires(struct rt6_info *rt)
142 {
143         rt->rt6i_flags &= ~RTF_EXPIRES;
144         rt->dst.expires = 0;
145 }
146 
147 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
148 {
149         rt->dst.expires = expires;
150         rt->rt6i_flags |= RTF_EXPIRES;
151 }
152 
153 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
154 {
155         struct rt6_info *rt;
156 
157         for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
158              rt = (struct rt6_info *)rt->dst.from);
159         if (rt && rt != rt0)
160                 rt0->dst.expires = rt->dst.expires;
161 
162         dst_set_expires(&rt0->dst, timeout);
163         rt0->rt6i_flags |= RTF_EXPIRES;
164 }
165 
166 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
167 {
168         if (rt->rt6i_flags & RTF_PCPU || unlikely(rt->dst.flags & DST_NOCACHE))
169                 rt = (struct rt6_info *)(rt->dst.from);
170 
171         return rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
172 }
173 
174 static inline void ip6_rt_put(struct rt6_info *rt)
175 {
176         /* dst_release() accepts a NULL parameter.
177          * We rely on dst being first structure in struct rt6_info
178          */
179         BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
180         dst_release(&rt->dst);
181 }
182 
183 enum fib6_walk_state {
184 #ifdef CONFIG_IPV6_SUBTREES
185         FWS_S,
186 #endif
187         FWS_L,
188         FWS_R,
189         FWS_C,
190         FWS_U
191 };
192 
193 struct fib6_walker {
194         struct list_head lh;
195         struct fib6_node *root, *node;
196         struct rt6_info *leaf;
197         enum fib6_walk_state state;
198         bool prune;
199         unsigned int skip;
200         unsigned int count;
201         int (*func)(struct fib6_walker *);
202         void *args;
203 };
204 
205 struct rt6_statistics {
206         __u32           fib_nodes;
207         __u32           fib_route_nodes;
208         __u32           fib_rt_alloc;           /* permanent routes     */
209         __u32           fib_rt_entries;         /* rt entries in table  */
210         __u32           fib_rt_cache;           /* cache routes         */
211         __u32           fib_discarded_routes;
212 };
213 
214 #define RTN_TL_ROOT     0x0001
215 #define RTN_ROOT        0x0002          /* tree root node               */
216 #define RTN_RTINFO      0x0004          /* node with valid routing info */
217 
218 /*
219  *      priority levels (or metrics)
220  *
221  */
222 
223 
224 struct fib6_table {
225         struct hlist_node       tb6_hlist;
226         u32                     tb6_id;
227         rwlock_t                tb6_lock;
228         struct fib6_node        tb6_root;
229         struct inet_peer_base   tb6_peers;
230 };
231 
232 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
233 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
234 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
235 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
236 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
237 
238 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
239 #define FIB6_TABLE_MIN          1
240 #define FIB6_TABLE_MAX          RT_TABLE_MAX
241 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
242 #else
243 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
244 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
245 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
246 #endif
247 
248 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
249                                          struct fib6_table *,
250                                          struct flowi6 *, int);
251 
252 /*
253  *      exported functions
254  */
255 
256 struct fib6_table *fib6_get_table(struct net *net, u32 id);
257 struct fib6_table *fib6_new_table(struct net *net, u32 id);
258 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
259                                    int flags, pol_lookup_t lookup);
260 
261 struct fib6_node *fib6_lookup(struct fib6_node *root,
262                               const struct in6_addr *daddr,
263                               const struct in6_addr *saddr);
264 
265 struct fib6_node *fib6_locate(struct fib6_node *root,
266                               const struct in6_addr *daddr, int dst_len,
267                               const struct in6_addr *saddr, int src_len);
268 
269 void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
270                     void *arg);
271 
272 int fib6_add(struct fib6_node *root, struct rt6_info *rt,
273              struct nl_info *info, struct mx6_config *mxc);
274 int fib6_del(struct rt6_info *rt, struct nl_info *info);
275 
276 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info);
277 
278 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
279 
280 void fib6_gc_cleanup(void);
281 
282 int fib6_init(void);
283 
284 int ipv6_route_open(struct inode *inode, struct file *file);
285 
286 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
287 int fib6_rules_init(void);
288 void fib6_rules_cleanup(void);
289 #else
290 static inline int               fib6_rules_init(void)
291 {
292         return 0;
293 }
294 static inline void              fib6_rules_cleanup(void)
295 {
296         return ;
297 }
298 #endif
299 #endif
300 

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