tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/rtnetlink.h>
20#include <linux/spinlock.h>
21#include <net/dst.h>
22#include <net/flow.h>
23#include <net/netlink.h>
24
25#ifdef CONFIG_IPV6_MULTIPLE_TABLES
26#define FIB6_TABLE_HASHSZ 256
27#else
28#define FIB6_TABLE_HASHSZ 1
29#endif
30
31struct rt6_info;
32
33struct fib6_config {
34 u32 fc_table;
35 u32 fc_metric;
36 int fc_dst_len;
37 int fc_src_len;
38 int fc_ifindex;
39 u32 fc_flags;
40 u32 fc_protocol;
41
42 struct in6_addr fc_dst;
43 struct in6_addr fc_src;
44 struct in6_addr fc_gateway;
45
46 unsigned long fc_expires;
47 struct nlattr *fc_mx;
48 int fc_mx_len;
49
50 struct nl_info fc_nlinfo;
51};
52
53struct fib6_node {
54 struct fib6_node *parent;
55 struct fib6_node *left;
56 struct fib6_node *right;
57#ifdef CONFIG_IPV6_SUBTREES
58 struct fib6_node *subtree;
59#endif
60 struct rt6_info *leaf;
61
62 __u16 fn_bit; /* bit key */
63 __u16 fn_flags;
64 __u32 fn_sernum;
65 struct rt6_info *rr_ptr;
66};
67
68#ifndef CONFIG_IPV6_SUBTREES
69#define FIB6_SUBTREE(fn) NULL
70#else
71#define FIB6_SUBTREE(fn) ((fn)->subtree)
72#endif
73
74/*
75 * routing information
76 *
77 */
78
79struct rt6key {
80 struct in6_addr addr;
81 int plen;
82};
83
84struct fib6_table;
85
86struct rt6_info {
87 union {
88 struct dst_entry dst;
89 } u;
90
91 struct inet6_dev *rt6i_idev;
92
93#define rt6i_dev u.dst.dev
94#define rt6i_nexthop u.dst.neighbour
95#define rt6i_expires u.dst.expires
96
97 struct fib6_node *rt6i_node;
98
99 struct in6_addr rt6i_gateway;
100
101 u32 rt6i_flags;
102 u32 rt6i_metric;
103 atomic_t rt6i_ref;
104
105 /* more non-fragment space at head required */
106 unsigned short rt6i_nfheader_len;
107
108 u8 rt6i_protocol;
109
110 struct fib6_table *rt6i_table;
111
112 struct rt6key rt6i_dst;
113
114#ifdef CONFIG_XFRM
115 u32 rt6i_flow_cache_genid;
116#endif
117
118 struct rt6key rt6i_src;
119};
120
121static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
122{
123 return ((struct rt6_info *)dst)->rt6i_idev;
124}
125
126struct fib6_walker_t {
127 struct list_head lh;
128 struct fib6_node *root, *node;
129 struct rt6_info *leaf;
130 unsigned char state;
131 unsigned char prune;
132 unsigned int skip;
133 unsigned int count;
134 int (*func)(struct fib6_walker_t *);
135 void *args;
136};
137
138struct rt6_statistics {
139 __u32 fib_nodes;
140 __u32 fib_route_nodes;
141 __u32 fib_rt_alloc; /* permanent routes */
142 __u32 fib_rt_entries; /* rt entries in table */
143 __u32 fib_rt_cache; /* cache routes */
144 __u32 fib_discarded_routes;
145};
146
147#define RTN_TL_ROOT 0x0001
148#define RTN_ROOT 0x0002 /* tree root node */
149#define RTN_RTINFO 0x0004 /* node with valid routing info */
150
151/*
152 * priority levels (or metrics)
153 *
154 */
155
156
157struct fib6_table {
158 struct hlist_node tb6_hlist;
159 u32 tb6_id;
160 rwlock_t tb6_lock;
161 struct fib6_node tb6_root;
162};
163
164#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
165#define RT6_TABLE_MAIN RT_TABLE_MAIN
166#define RT6_TABLE_DFLT RT6_TABLE_MAIN
167#define RT6_TABLE_INFO RT6_TABLE_MAIN
168#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
169
170#ifdef CONFIG_IPV6_MULTIPLE_TABLES
171#define FIB6_TABLE_MIN 1
172#define FIB6_TABLE_MAX RT_TABLE_MAX
173#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
174#else
175#define FIB6_TABLE_MIN RT_TABLE_MAIN
176#define FIB6_TABLE_MAX FIB6_TABLE_MIN
177#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
178#endif
179
180typedef struct rt6_info *(*pol_lookup_t)(struct net *,
181 struct fib6_table *,
182 struct flowi *, int);
183
184/*
185 * exported functions
186 */
187
188extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
189extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
190extern struct dst_entry *fib6_rule_lookup(struct net *net,
191 struct flowi *fl, int flags,
192 pol_lookup_t lookup);
193
194extern struct fib6_node *fib6_lookup(struct fib6_node *root,
195 struct in6_addr *daddr,
196 struct in6_addr *saddr);
197
198struct fib6_node *fib6_locate(struct fib6_node *root,
199 struct in6_addr *daddr, int dst_len,
200 struct in6_addr *saddr, int src_len);
201
202extern void fib6_clean_all(struct net *net,
203 int (*func)(struct rt6_info *, void *arg),
204 int prune, void *arg);
205
206extern int fib6_add(struct fib6_node *root,
207 struct rt6_info *rt,
208 struct nl_info *info);
209
210extern int fib6_del(struct rt6_info *rt,
211 struct nl_info *info);
212
213extern void inet6_rt_notify(int event, struct rt6_info *rt,
214 struct nl_info *info);
215
216extern void fib6_run_gc(unsigned long expires,
217 struct net *net);
218
219extern void fib6_gc_cleanup(void);
220
221extern int fib6_init(void);
222
223#ifdef CONFIG_IPV6_MULTIPLE_TABLES
224extern int fib6_rules_init(void);
225extern void fib6_rules_cleanup(void);
226#else
227static inline int fib6_rules_init(void)
228{
229 return 0;
230}
231static inline void fib6_rules_cleanup(void)
232{
233 return ;
234}
235#endif
236#endif
237#endif