xref: /illumos-gate/usr/src/uts/common/net/radix.h (revision 2d6eb4a5)
1 /*
2  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  *
5  * Copyright (c) 1988, 1989, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 4. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  *	@(#)radix.h	8.2 (Berkeley) 10/31/94
33  * $FreeBSD: /repoman/r/ncvs/src/sys/net/radix.h,v 1.25.2.1 2005/01/31 23:26:23
34  * imp Exp $
35  */
36 
37 #ifndef _RADIX_H_
38 #define	_RADIX_H_
39 
40 #ifdef	__cplusplus
41 extern "C" {
42 #endif
43 
44 #ifdef _KERNEL
45 #include <sys/mutex.h>
46 #include <netinet/in.h>
47 #endif
48 #include <sys/sysmacros.h>
49 
50 #ifdef MALLOC_DECLARE
51 MALLOC_DECLARE(M_RTABLE);
52 #endif
53 
54 /*
55  * Radix search tree node layout.
56  */
57 
58 struct radix_node {
59 	struct	radix_mask *rn_mklist;	/* list of masks contained in subtree */
60 	struct	radix_node *rn_parent;	/* parent */
61 	short	rn_bit;			/* bit offset; -1-index(netmask) */
62 	char	rn_bmask;		/* node: mask for bit test */
63 	uchar_t	rn_flags;		/* enumerated next */
64 #define	RNF_NORMAL	1		/* leaf contains normal route */
65 #define	RNF_ROOT	2		/* leaf is root leaf for tree */
66 #define	RNF_ACTIVE	4		/* This node is alive (for rtfree) */
67 	union {
68 		struct {			/* leaf only data: */
69 			caddr_t	rn_Key;		/* object of search */
70 			caddr_t	rn_Mask;	/* netmask, if present */
71 			struct	radix_node *rn_Dupedkey;
72 		} rn_leaf;
73 		struct {			/* node only data: */
74 			int	rn_Off;		/* where to start compare */
75 			struct	radix_node *rn_L; /* progeny */
76 			struct	radix_node *rn_R; /* progeny */
77 		} rn_node;
78 	}		rn_u;
79 };
80 
81 
82 #define	rn_dupedkey	rn_u.rn_leaf.rn_Dupedkey
83 #define	rn_key		rn_u.rn_leaf.rn_Key
84 #define	rn_mask		rn_u.rn_leaf.rn_Mask
85 #define	rn_offset	rn_u.rn_node.rn_Off
86 #define	rn_left		rn_u.rn_node.rn_L
87 #define	rn_right	rn_u.rn_node.rn_R
88 
89 /*
90  * Annotations to tree concerning potential routes applying to subtrees.
91  */
92 
93 struct radix_mask {
94 	short	rm_bit;			/* bit offset; -1-index(netmask) */
95 	char	rm_unused;		/* cf. rn_bmask */
96 	uchar_t	rm_flags;		/* cf. rn_flags */
97 	struct	radix_mask *rm_mklist;	/* more masks to try */
98 	union	{
99 		caddr_t	rmu_mask;		/* the mask */
100 		struct	radix_node *rmu_leaf;	/* for normal routes */
101 	}	rm_rmu;
102 	int	rm_refs;		/* # of references to this struct */
103 };
104 
105 #define	rm_mask rm_rmu.rmu_mask
106 #define	rm_leaf rm_rmu.rmu_leaf		/* extra field would make 32 bytes */
107 
108 typedef int walktree_f_t(struct radix_node *, void *);
109 typedef boolean_t match_leaf_t(struct radix_node *, void *);
110 typedef void (*lockf_t)(struct radix_node *);
111 
112 struct radix_node_head {
113 	struct	radix_node *rnh_treetop;
114 	int	rnh_addrsize;		/* permit, but not require fixed keys */
115 	int	rnh_pktsize;		/* permit, but not require fixed keys */
116 	struct	radix_node *(*rnh_addaddr)	/* add based on sockaddr */
117 		(void *v, void *mask,
118 		struct radix_node_head *head, struct radix_node nodes[]);
119 	struct	radix_node *(*rnh_addpkt)	/* add based on packet hdr */
120 		(void *v, void *mask,
121 		    struct radix_node_head *head, struct radix_node nodes[]);
122 	struct	radix_node *(*rnh_deladdr)	/* remove based on sockaddr */
123 		(void *v, void *mask, struct radix_node_head *head);
124 	struct	radix_node *(*rnh_delpkt)	/* remove based on packet hdr */
125 		(void *v, void *mask, struct radix_node_head *head);
126 	struct	radix_node *(*rnh_matchaddr)	/* locate based on sockaddr */
127 		(void *v, struct radix_node_head *head);
128 	/* rnh_matchaddr_args: locate based on sockaddr and match_leaf_t() */
129 	struct	radix_node *(*rnh_matchaddr_args)
130 		(void *v, struct radix_node_head *head,
131 		match_leaf_t *f, void *w);
132 	struct	radix_node *(*rnh_lookup)	/* locate based on sockaddr */
133 		(void *v, void *mask, struct radix_node_head *head);
134 	struct	radix_node *(*rnh_matchpkt)	/* locate based on packet hdr */
135 		(void *v, struct radix_node_head *head);
136 	int	(*rnh_walktree)			/* traverse tree */
137 		(struct radix_node_head *head, walktree_f_t *f, void *w);
138 	int	(*rnh_walktree_mt)			/* traverse tree */
139 		(struct radix_node_head *head, walktree_f_t *f, void *w,
140 		lockf_t lockf, lockf_t unlockf);
141 	/* rn_walktree_mt: MT safe version of rn_walktree */
142 	int	(*rnh_walktree_from)		/* traverse tree below a */
143 		(struct radix_node_head *head, void *a, void *m,
144 		    walktree_f_t *f, void *w);
145 	void	(*rnh_close)	/* do something when the last ref drops */
146 		(struct radix_node *rn, struct radix_node_head *head);
147 	struct	radix_node rnh_nodes[3];	/* empty tree for common case */
148 #ifdef _KERNEL
149 	krwlock_t rnh_lock;			/* locks entire radix tree */
150 #endif
151 };
152 
153 #ifdef _KERNEL
154 /*
155  * BSD's sockaddr_in and sockadr have a sin_len and an sa_len
156  * field respectively, as the first field in the structure, and
157  * everything in radix.c assumes that the first byte of the "varg"
158  * passed in tells the length of the key (the sockaddr).
159  *
160  * Since Solaris' sockaddr_in and sockadr, do not have these fields, we
161  * define a BSD4-like sockaddr_in structure with rt_sin_len field to
162  * make LEN macro wn radix.c to work correctly for Solaris
163  * See comments around LEN() macro in ip/radix.c
164  * The callers of functions of radix.c have to use this data structure
165  */
166 struct rt_sockaddr  {
167 	uint8_t		rt_sin_len;
168 	uint8_t		rt_sin_family;
169 	uint16_t	rt_sin_port;
170 	struct in_addr	rt_sin_addr;
171 	char		rt_sin_zero[8];
172 };
173 
174 
175 #define	R_Malloc(p, c, n)  p = kmem_cache_alloc((c),  KM_NOSLEEP)
176 #define	R_Zalloc(p, c, n) \
177 		if (p = kmem_cache_alloc((c), KM_NOSLEEP)) {\
178 			bzero(p, n); \
179 		}
180 #define	R_ZallocSleep(p, t, n)	p = (t) kmem_zalloc(n, KM_SLEEP)
181 #define	Free(p, c)  kmem_cache_free(c, p)
182 #define	FreeHead(p, n)  kmem_free(p, n)
183 
184 typedef struct radix_node rn_t;
185 typedef struct radix_mask rmsk_t;
186 typedef struct radix_node_head rnh_t;
187 typedef struct rt_sockaddr rt_sa_t;
188 
189 #define	RADIX_NODE_HEAD_LOCK_INIT(rnh)	\
190 	rw_init(&(rnh)->rnh_lock, NULL, RW_DEFAULT, NULL)
191 #define	RADIX_NODE_HEAD_RLOCK(rnh)	rw_enter(&(rnh)->rnh_lock, RW_READER)
192 #define	RADIX_NODE_HEAD_WLOCK(rnh)	rw_enter(&(rnh)->rnh_lock, RW_WRITER)
193 #define	RADIX_NODE_HEAD_UNLOCK(rnh)	rw_exit(&(rnh)->rnh_lock)
194 #define	RADIX_NODE_HEAD_DESTROY(rnh)	rw_destroy(&(rnh)->rnh_lock)
195 #define	RADIX_NODE_HEAD_LOCK_ASSERT(rnh) RW_WRITE_HELD(&(rnh)->rnh_lock)
196 
197 #else /* _KERNEL */
198 
199 #define	R_Malloc(p, t, n) (p =  malloc((unsigned int)(n)))
200 #define	R_Zalloc(p, t, n) (p =  calloc(1, (unsigned int)(n)))
201 #define	R_ZallocSleep(p, t, n) R_Zalloc(p, t, n)
202 #define	Free(p, c) free((char *)p); /* c is ignored */
203 #ifndef	RADIX_NODE_HEAD_RLOCK
204 #define	RADIX_NODE_HEAD_RLOCK(x)	/* */
205 #endif
206 #ifndef	RADIX_NODE_HEAD_WLOCK
207 #define	RADIX_NODE_HEAD_WLOCK(x)	/* */
208 #endif
209 #ifndef	RADIX_NODE_HEAD_UNLOCK
210 #define	RADIX_NODE_HEAD_UNLOCK(x)	/* */
211 #endif
212 
213 #endif /* _KERNEL */
214 
215 #ifndef min
216 #define	min MIN
217 #endif
218 #ifndef max
219 #define	max MAX
220 #endif
221 
222 void	rn_init(void);
223 void	rn_fini(void);
224 int	rn_inithead(void **, int);
225 int	rn_freenode(struct radix_node *, void *);
226 void	rn_freehead(struct radix_node_head *);
227 
228 #ifdef	__cplusplus
229 }
230 #endif
231 
232 #endif /* _RADIX_H_ */
233