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};
62
63#ifndef CONFIG_IPV6_SUBTREES
64#define FIB6_SUBTREE(fn) NULL
65#else
66#define FIB6_SUBTREE(fn) ((fn)->subtree)
67#endif
68
69/*
70 * routing information
71 *
72 */
73
74struct rt6key
75{
76 struct in6_addr addr;
77 int plen;
78};
79
80struct fib6_table;
81
82struct rt6_info
83{
84 union {
85 struct dst_entry dst;
86 struct rt6_info *next;
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 struct fib6_table *rt6i_table;
103
104 struct rt6key rt6i_dst;
105 struct rt6key rt6i_src;
106
107 u8 rt6i_protocol;
108};
109
110static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
111{
112 return ((struct rt6_info *)dst)->rt6i_idev;
113}
114
115struct fib6_walker_t
116{
117 struct fib6_walker_t *prev, *next;
118 struct fib6_node *root, *node;
119 struct rt6_info *leaf;
120 unsigned char state;
121 unsigned char prune;
122 int (*func)(struct fib6_walker_t *);
123 void *args;
124};
125
126struct rt6_statistics {
127 __u32 fib_nodes;
128 __u32 fib_route_nodes;
129 __u32 fib_rt_alloc; /* permanent routes */
130 __u32 fib_rt_entries; /* rt entries in table */
131 __u32 fib_rt_cache; /* cache routes */
132 __u32 fib_discarded_routes;
133};
134
135#define RTN_TL_ROOT 0x0001
136#define RTN_ROOT 0x0002 /* tree root node */
137#define RTN_RTINFO 0x0004 /* node with valid routing info */
138
139/*
140 * priority levels (or metrics)
141 *
142 */
143
144#define RTPRI_FIREWALL 8 /* Firewall control information */
145#define RTPRI_FLOW 16 /* Flow based forwarding rules */
146#define RTPRI_KERN_CTL 32 /* Kernel control routes */
147
148#define RTPRI_USER_MIN 256 /* Mimimum user priority */
149#define RTPRI_USER_MAX 1024 /* Maximum user priority */
150
151#define RTPRI_KERN_DFLT 4096 /* Kernel default routes */
152
153#define MAX_FLOW_BACKTRACE 32
154
155
156typedef void (*f_pnode)(struct fib6_node *fn, void *);
157
158struct fib6_table {
159 struct hlist_node tb6_hlist;
160 u32 tb6_id;
161 rwlock_t tb6_lock;
162 struct fib6_node tb6_root;
163};
164
165#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
166#define RT6_TABLE_MAIN RT_TABLE_MAIN
167#define RT6_TABLE_DFLT RT6_TABLE_MAIN
168#define RT6_TABLE_INFO RT6_TABLE_MAIN
169#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
170
171#ifdef CONFIG_IPV6_MULTIPLE_TABLES
172#define FIB6_TABLE_MIN 1
173#define FIB6_TABLE_MAX RT_TABLE_MAX
174#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
175#else
176#define FIB6_TABLE_MIN RT_TABLE_MAIN
177#define FIB6_TABLE_MAX FIB6_TABLE_MIN
178#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
179#endif
180
181typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *,
182 struct flowi *, int);
183
184/*
185 * exported functions
186 */
187
188extern struct fib6_table * fib6_get_table(u32 id);
189extern struct fib6_table * fib6_new_table(u32 id);
190extern struct dst_entry * fib6_rule_lookup(struct flowi *fl, int flags,
191 pol_lookup_t lookup);
192
193extern struct fib6_node *fib6_lookup(struct fib6_node *root,
194 struct in6_addr *daddr,
195 struct in6_addr *saddr);
196
197struct fib6_node *fib6_locate(struct fib6_node *root,
198 struct in6_addr *daddr, int dst_len,
199 struct in6_addr *saddr, int src_len);
200
201extern void fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
202 int prune, void *arg);
203
204extern int fib6_add(struct fib6_node *root,
205 struct rt6_info *rt,
206 struct nl_info *info);
207
208extern int fib6_del(struct rt6_info *rt,
209 struct nl_info *info);
210
211extern void inet6_rt_notify(int event, struct rt6_info *rt,
212 struct nl_info *info);
213
214extern void fib6_run_gc(unsigned long dummy);
215
216extern void fib6_gc_cleanup(void);
217
218extern void fib6_init(void);
219
220extern void fib6_rules_init(void);
221extern void fib6_rules_cleanup(void);
222extern int fib6_rules_dump(struct sk_buff *,
223 struct netlink_callback *);
224
225#endif
226#endif