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
25struct rt6_info;
26
27struct fib6_config
28{
29 u32 fc_table;
30 u32 fc_metric;
31 int fc_dst_len;
32 int fc_src_len;
33 int fc_ifindex;
34 u32 fc_flags;
35 u32 fc_protocol;
36
37 struct in6_addr fc_dst;
38 struct in6_addr fc_src;
39 struct in6_addr fc_gateway;
40
41 unsigned long fc_expires;
42 struct nlattr *fc_mx;
43 int fc_mx_len;
44
45 struct nl_info fc_nlinfo;
46};
47
48struct fib6_node
49{
50 struct fib6_node *parent;
51 struct fib6_node *left;
52 struct fib6_node *right;
53#ifdef CONFIG_IPV6_SUBTREES
54 struct fib6_node *subtree;
55#endif
56 struct rt6_info *leaf;
57
58 __u16 fn_bit; /* bit key */
59 __u16 fn_flags;
60 __u32 fn_sernum;
61 struct rt6_info *rr_ptr;
62};
63
64#ifndef CONFIG_IPV6_SUBTREES
65#define FIB6_SUBTREE(fn) NULL
66#else
67#define FIB6_SUBTREE(fn) ((fn)->subtree)
68#endif
69
70/*
71 * routing information
72 *
73 */
74
75struct rt6key
76{
77 struct in6_addr addr;
78 int plen;
79};
80
81struct fib6_table;
82
83struct rt6_info
84{
85 union {
86 struct dst_entry dst;
87 } u;
88
89 struct inet6_dev *rt6i_idev;
90
91#define rt6i_dev u.dst.dev
92#define rt6i_nexthop u.dst.neighbour
93#define rt6i_expires u.dst.expires
94
95 struct fib6_node *rt6i_node;
96
97 struct in6_addr rt6i_gateway;
98
99 u32 rt6i_flags;
100 u32 rt6i_metric;
101 atomic_t rt6i_ref;
102
103 /* more non-fragment space at head required */
104 unsigned short rt6i_nfheader_len;
105
106 u8 rt6i_protocol;
107
108 struct fib6_table *rt6i_table;
109
110 struct rt6key rt6i_dst;
111
112#ifdef CONFIG_XFRM
113 u32 rt6i_flow_cache_genid;
114#endif
115
116 struct rt6key rt6i_src;
117};
118
119static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
120{
121 return ((struct rt6_info *)dst)->rt6i_idev;
122}
123
124struct fib6_walker_t
125{
126 struct fib6_walker_t *prev, *next;
127 struct fib6_node *root, *node;
128 struct rt6_info *leaf;
129 unsigned char state;
130 unsigned char prune;
131 int (*func)(struct fib6_walker_t *);
132 void *args;
133};
134
135struct rt6_statistics {
136 __u32 fib_nodes;
137 __u32 fib_route_nodes;
138 __u32 fib_rt_alloc; /* permanent routes */
139 __u32 fib_rt_entries; /* rt entries in table */
140 __u32 fib_rt_cache; /* cache routes */
141 __u32 fib_discarded_routes;
142};
143
144#define RTN_TL_ROOT 0x0001
145#define RTN_ROOT 0x0002 /* tree root node */
146#define RTN_RTINFO 0x0004 /* node with valid routing info */
147
148/*
149 * priority levels (or metrics)
150 *
151 */
152
153#define RTPRI_FIREWALL 8 /* Firewall control information */
154#define RTPRI_FLOW 16 /* Flow based forwarding rules */
155#define RTPRI_KERN_CTL 32 /* Kernel control routes */
156
157#define RTPRI_USER_MIN 256 /* Mimimum user priority */
158#define RTPRI_USER_MAX 1024 /* Maximum user priority */
159
160#define RTPRI_KERN_DFLT 4096 /* Kernel default routes */
161
162#define MAX_FLOW_BACKTRACE 32
163
164
165typedef void (*f_pnode)(struct fib6_node *fn, void *);
166
167struct fib6_table {
168 struct hlist_node tb6_hlist;
169 u32 tb6_id;
170 rwlock_t tb6_lock;
171 struct fib6_node tb6_root;
172};
173
174#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
175#define RT6_TABLE_MAIN RT_TABLE_MAIN
176#define RT6_TABLE_DFLT RT6_TABLE_MAIN
177#define RT6_TABLE_INFO RT6_TABLE_MAIN
178#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
179
180#ifdef CONFIG_IPV6_MULTIPLE_TABLES
181#define FIB6_TABLE_MIN 1
182#define FIB6_TABLE_MAX RT_TABLE_MAX
183#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
184#else
185#define FIB6_TABLE_MIN RT_TABLE_MAIN
186#define FIB6_TABLE_MAX FIB6_TABLE_MIN
187#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
188#endif
189
190typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *,
191 struct flowi *, int);
192
193/*
194 * exported functions
195 */
196
197extern struct fib6_table * fib6_get_table(u32 id);
198extern struct fib6_table * fib6_new_table(u32 id);
199extern struct dst_entry * fib6_rule_lookup(struct flowi *fl, int flags,
200 pol_lookup_t lookup);
201
202extern struct fib6_node *fib6_lookup(struct fib6_node *root,
203 struct in6_addr *daddr,
204 struct in6_addr *saddr);
205
206struct fib6_node *fib6_locate(struct fib6_node *root,
207 struct in6_addr *daddr, int dst_len,
208 struct in6_addr *saddr, int src_len);
209
210extern void fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
211 int prune, void *arg);
212
213extern int fib6_add(struct fib6_node *root,
214 struct rt6_info *rt,
215 struct nl_info *info);
216
217extern int fib6_del(struct rt6_info *rt,
218 struct nl_info *info);
219
220extern void inet6_rt_notify(int event, struct rt6_info *rt,
221 struct nl_info *info);
222
223extern void fib6_run_gc(unsigned long dummy);
224
225extern void fib6_gc_cleanup(void);
226
227extern int fib6_init(void);
228
229#ifdef CONFIG_IPV6_MULTIPLE_TABLES
230extern int fib6_rules_init(void);
231extern void fib6_rules_cleanup(void);
232#else
233static inline int fib6_rules_init(void)
234{
235 return 0;
236}
237static inline void fib6_rules_cleanup(void)
238{
239 return ;
240}
241#endif
242#endif
243#endif