drm/linux: Stop using driver softcs for dev_set/get_drvdata()
[dragonfly.git] / sys / net / radix.c
CommitLineData
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1/*
2 * Copyright (c) 1988, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
dc71b7ab 13 * 3. Neither the name of the University nor the names of its contributors
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14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)radix.c 8.4 (Berkeley) 11/2/94
30 * $FreeBSD: src/sys/net/radix.c,v 1.20.2.3 2002/04/28 05:40:25 suz Exp $
31 */
32
33/*
34 * Routines to build and maintain radix trees for routing lookups.
35 */
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36#include <sys/param.h>
37#ifdef _KERNEL
38#include <sys/systm.h>
39#include <sys/malloc.h>
984263bc 40#include <sys/domain.h>
ac0f13c5
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41#include <sys/globaldata.h>
42#include <sys/thread.h>
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43#else
44#include <stdlib.h>
45#endif
46#include <sys/syslog.h>
43dbcc2a 47
984263bc 48#include <net/radix.h>
43dbcc2a
SZ
49#include <net/netmsg2.h>
50#include <net/netisr2.h>
984263bc 51
2e9572df
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52/*
53 * The arguments to the radix functions are really counted byte arrays with
54 * the length in the first byte. struct sockaddr's fit this type structurally.
55 */
56#define clen(c) (*(u_char *)(c))
57
f23061d4 58static int rn_walktree_from(struct radix_node_head *h, char *a, char *m,
2e9572df
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59 walktree_f_t *f, void *w);
60static int rn_walktree(struct radix_node_head *, walktree_f_t *, void *);
291dd55b
SZ
61static int rn_walktree_at(struct radix_node_head *h, const char *a,
62 const char *m, walktree_f_t *f, void *w);
2e9572df 63
984263bc 64static struct radix_node
2e9572df 65 *rn_insert(char *, struct radix_node_head *, boolean_t *,
f23061d4 66 struct radix_node [2]),
2e9572df
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67 *rn_newpair(char *, int, struct radix_node[2]),
68 *rn_search(const char *, struct radix_node *),
69 *rn_search_m(const char *, struct radix_node *, const char *);
984263bc 70
5909f744 71static struct radix_mask *rn_mkfreelist[MAXCPU];
ac0f13c5 72static struct radix_node_head *mask_rnheads[MAXCPU];
984263bc 73
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74static char rn_zeros[RN_MAXKEYLEN];
75static char rn_ones[RN_MAXKEYLEN] = RN_MAXKEYONES;
984263bc 76
99ebfb7c 77static boolean_t rn_lexobetter(char *m, char *n);
984263bc 78static struct radix_mask *
2e9572df 79 rn_new_radix_mask(struct radix_node *tt, struct radix_mask *nextmask);
5fe66e68 80static boolean_t
2e9572df
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81 rn_satisfies_leaf(char *trial, struct radix_node *leaf, int skip);
82
83static __inline struct radix_mask *
84MKGet(struct radix_mask **l)
85{
86 struct radix_mask *m;
87
88 if (*l != NULL) {
89 m = *l;
90 *l = m->rm_next;
91 } else {
5fe66e68 92 R_Malloc(m, struct radix_mask *, sizeof *m);
2e9572df
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93 }
94 return m;
95}
96
97static __inline void
98MKFree(struct radix_mask **l, struct radix_mask *m)
99{
100 m->rm_next = *l;
101 *l = m;
102}
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103
104/*
105 * The data structure for the keys is a radix tree with one way
106 * branching removed. The index rn_bit at an internal node n represents a bit
107 * position to be tested. The tree is arranged so that all descendants
108 * of a node n have keys whose bits all agree up to position rn_bit - 1.
109 * (We say the index of n is rn_bit.)
110 *
111 * There is at least one descendant which has a one bit at position rn_bit,
112 * and at least one with a zero there.
113 *
114 * A route is determined by a pair of key and mask. We require that the
115 * bit-wise logical and of the key and mask to be the key.
116 * We define the index of a route to associated with the mask to be
117 * the first bit number in the mask where 0 occurs (with bit number 0
118 * representing the highest order bit).
119 *
120 * We say a mask is normal if every bit is 0, past the index of the mask.
121 * If a node n has a descendant (k, m) with index(m) == index(n) == rn_bit,
122 * and m is a normal mask, then the route applies to every descendant of n.
123 * If the index(m) < rn_bit, this implies the trailing last few bits of k
124 * before bit b are all 0, (and hence consequently true of every descendant
125 * of n), so the route applies to all descendants of the node as well.
126 *
127 * Similar logic shows that a non-normal mask m such that
128 * index(m) <= index(n) could potentially apply to many children of n.
129 * Thus, for each non-host route, we attach its mask to a list at an internal
130 * node as high in the tree as we can go.
131 *
132 * The present version of the code makes use of normal routes in short-
133 * circuiting an explict mask and compare operation when testing whether
134 * a key satisfies a normal route, and also in remembering the unique leaf
135 * that governs a subtree.
136 */
137
138static struct radix_node *
2e9572df 139rn_search(const char *v, struct radix_node *head)
984263bc 140{
82ed7fc2 141 struct radix_node *x;
984263bc 142
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143 x = head;
144 while (x->rn_bit >= 0) {
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145 if (x->rn_bmask & v[x->rn_offset])
146 x = x->rn_right;
147 else
148 x = x->rn_left;
149 }
150 return (x);
151}
152
153static struct radix_node *
2e9572df 154rn_search_m(const char *v, struct radix_node *head, const char *m)
984263bc 155{
82ed7fc2 156 struct radix_node *x;
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157
158 for (x = head; x->rn_bit >= 0;) {
159 if ((x->rn_bmask & m[x->rn_offset]) &&
160 (x->rn_bmask & v[x->rn_offset]))
161 x = x->rn_right;
162 else
163 x = x->rn_left;
164 }
165 return x;
166}
167
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168boolean_t
169rn_refines(char *m, char *n)
984263bc 170{
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171 char *lim, *lim2;
172 int longer = clen(n++) - clen(m++);
173 boolean_t masks_are_equal = TRUE;
984263bc 174
2e9572df 175 lim2 = lim = n + clen(n);
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176 if (longer > 0)
177 lim -= longer;
178 while (n < lim) {
179 if (*n & ~(*m))
f23061d4 180 return FALSE;
984263bc 181 if (*n++ != *m++)
2e9572df 182 masks_are_equal = FALSE;
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183 }
184 while (n < lim2)
185 if (*n++)
f23061d4 186 return FALSE;
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187 if (masks_are_equal && (longer < 0))
188 for (lim2 = m - longer; m < lim2; )
189 if (*m++)
f23061d4 190 return TRUE;
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191 return (!masks_are_equal);
192}
193
194struct radix_node *
2e9572df 195rn_lookup(char *key, char *mask, struct radix_node_head *head)
984263bc 196{
82ed7fc2 197 struct radix_node *x;
2e9572df 198 char *netmask = NULL;
984263bc 199
2e9572df 200 if (mask != NULL) {
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201 x = rn_addmask(mask, TRUE, head->rnh_treetop->rn_offset,
202 head->rnh_maskhead);
2e9572df
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203 if (x == NULL)
204 return (NULL);
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205 netmask = x->rn_key;
206 }
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207 x = rn_match(key, head);
208 if (x != NULL && netmask != NULL) {
209 while (x != NULL && x->rn_mask != netmask)
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210 x = x->rn_dupedkey;
211 }
212 return x;
213}
214
5fe66e68 215static boolean_t
2e9572df 216rn_satisfies_leaf(char *trial, struct radix_node *leaf, int skip)
984263bc 217{
82ed7fc2 218 char *cp = trial, *cp2 = leaf->rn_key, *cp3 = leaf->rn_mask;
984263bc 219 char *cplim;
2e9572df 220 int length = min(clen(cp), clen(cp2));
984263bc 221
2e9572df 222 if (cp3 == NULL)
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223 cp3 = rn_ones;
224 else
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225 length = min(length, clen(cp3));
226 cplim = cp + length;
227 cp3 += skip;
228 cp2 += skip;
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229 for (cp += skip; cp < cplim; cp++, cp2++, cp3++)
230 if ((*cp ^ *cp2) & *cp3)
5fe66e68
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231 return FALSE;
232 return TRUE;
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233}
234
235struct radix_node *
2e9572df 236rn_match(char *key, struct radix_node_head *head)
984263bc 237{
2e9572df
JH
238 struct radix_node *t, *x;
239 char *cp = key, *cp2;
240 char *cplim;
241 struct radix_node *saved_t, *top = head->rnh_treetop;
242 int off = top->rn_offset, klen, matched_off;
82ed7fc2 243 int test, b, rn_bit;
984263bc 244
2e9572df 245 t = rn_search(key, top);
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246 /*
247 * See if we match exactly as a host destination
248 * or at least learn how many bits match, for normal mask finesse.
249 *
250 * It doesn't hurt us to limit how many bytes to check
251 * to the length of the mask, since if it matches we had a genuine
252 * match and the leaf we have is the most specific one anyway;
253 * if it didn't match with a shorter length it would fail
254 * with a long one. This wins big for class B&C netmasks which
255 * are probably the most common case...
256 */
2e9572df
JH
257 if (t->rn_mask != NULL)
258 klen = clen(t->rn_mask);
259 else
260 klen = clen(key);
261 cp += off; cp2 = t->rn_key + off; cplim = key + klen;
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262 for (; cp < cplim; cp++, cp2++)
263 if (*cp != *cp2)
264 goto on1;
265 /*
266 * This extra grot is in case we are explicitly asked
267 * to look up the default. Ugh!
268 *
269 * Never return the root node itself, it seems to cause a
270 * lot of confusion.
271 */
272 if (t->rn_flags & RNF_ROOT)
273 t = t->rn_dupedkey;
274 return t;
275on1:
276 test = (*cp ^ *cp2) & 0xff; /* find first bit that differs */
277 for (b = 7; (test >>= 1) > 0;)
278 b--;
2e9572df 279 matched_off = cp - key;
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280 b += matched_off << 3;
281 rn_bit = -1 - b;
282 /*
283 * If there is a host route in a duped-key chain, it will be first.
284 */
2e9572df 285 if ((saved_t = t)->rn_mask == NULL)
984263bc 286 t = t->rn_dupedkey;
2e9572df 287 for (; t; t = t->rn_dupedkey) {
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288 /*
289 * Even if we don't match exactly as a host,
290 * we may match if the leaf we wound up at is
291 * a route to a net.
292 */
293 if (t->rn_flags & RNF_NORMAL) {
294 if (rn_bit <= t->rn_bit)
295 return t;
2e9572df 296 } else if (rn_satisfies_leaf(key, t, matched_off))
984263bc 297 return t;
2e9572df 298 }
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MD
299 t = saved_t;
300 /* start searching up the tree */
301 do {
82ed7fc2 302 struct radix_mask *m;
2e9572df 303
984263bc 304 t = t->rn_parent;
984263bc
MD
305 /*
306 * If non-contiguous masks ever become important
307 * we can restore the masking and open coding of
308 * the search and satisfaction test and put the
309 * calculation of "off" back before the "do".
310 */
2e9572df
JH
311 m = t->rn_mklist;
312 while (m != NULL) {
984263bc
MD
313 if (m->rm_flags & RNF_NORMAL) {
314 if (rn_bit <= m->rm_bit)
315 return (m->rm_leaf);
316 } else {
317 off = min(t->rn_offset, matched_off);
2e9572df
JH
318 x = rn_search_m(key, t, m->rm_mask);
319 while (x != NULL && x->rn_mask != m->rm_mask)
984263bc 320 x = x->rn_dupedkey;
2e9572df 321 if (x && rn_satisfies_leaf(key, x, off))
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322 return x;
323 }
2e9572df 324 m = m->rm_next;
984263bc
MD
325 }
326 } while (t != top);
2e9572df 327 return NULL;
984263bc
MD
328}
329
330#ifdef RN_DEBUG
5fe66e68
JH
331int rn_nodenum;
332struct radix_node *rn_clist;
333int rn_saveinfo;
334boolean_t rn_debug = TRUE;
984263bc
MD
335#endif
336
337static struct radix_node *
2e9572df 338rn_newpair(char *key, int indexbit, struct radix_node nodes[2])
984263bc 339{
5fe66e68 340 struct radix_node *leaf = &nodes[0], *interior = &nodes[1];
2e9572df
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341
342 interior->rn_bit = indexbit;
343 interior->rn_bmask = 0x80 >> (indexbit & 0x7);
344 interior->rn_offset = indexbit >> 3;
345 interior->rn_left = leaf;
346 interior->rn_mklist = NULL;
347
348 leaf->rn_bit = -1;
349 leaf->rn_key = key;
350 leaf->rn_parent = interior;
351 leaf->rn_flags = interior->rn_flags = RNF_ACTIVE;
352 leaf->rn_mklist = NULL;
353
984263bc 354#ifdef RN_DEBUG
2e9572df
JH
355 leaf->rn_info = rn_nodenum++;
356 interior->rn_info = rn_nodenum++;
357 leaf->rn_twin = interior;
358 leaf->rn_ybro = rn_clist;
359 rn_clist = leaf;
984263bc 360#endif
2e9572df 361 return interior;
984263bc
MD
362}
363
364static struct radix_node *
f23061d4
JH
365rn_insert(char *key, struct radix_node_head *head, boolean_t *dupentry,
366 struct radix_node nodes[2])
984263bc 367{
984263bc 368 struct radix_node *top = head->rnh_treetop;
2e9572df
JH
369 int head_off = top->rn_offset, klen = clen(key);
370 struct radix_node *t = rn_search(key, top);
371 char *cp = key + head_off;
82ed7fc2 372 int b;
984263bc 373 struct radix_node *tt;
5fe66e68 374
f23061d4 375 /*
2e9572df 376 * Find first bit at which the key and t->rn_key differ
984263bc
MD
377 */
378 {
2e9572df 379 char *cp2 = t->rn_key + head_off;
82ed7fc2 380 int cmp_res;
2e9572df 381 char *cplim = key + klen;
984263bc
MD
382
383 while (cp < cplim)
384 if (*cp2++ != *cp++)
385 goto on1;
2e9572df 386 *dupentry = TRUE;
984263bc
MD
387 return t;
388on1:
2e9572df 389 *dupentry = FALSE;
984263bc 390 cmp_res = (cp[-1] ^ cp2[-1]) & 0xff;
2e9572df 391 for (b = (cp - key) << 3; cmp_res; b--)
984263bc
MD
392 cmp_res >>= 1;
393 }
394 {
82ed7fc2 395 struct radix_node *p, *x = top;
2e9572df
JH
396
397 cp = key;
984263bc
MD
398 do {
399 p = x;
400 if (cp[x->rn_offset] & x->rn_bmask)
401 x = x->rn_right;
402 else
403 x = x->rn_left;
404 } while (b > (unsigned) x->rn_bit);
405 /* x->rn_bit < b && x->rn_bit >= 0 */
406#ifdef RN_DEBUG
407 if (rn_debug)
408 log(LOG_DEBUG, "rn_insert: Going In:\n"), traverse(p);
409#endif
2e9572df 410 t = rn_newpair(key, b, nodes);
984263bc
MD
411 tt = t->rn_left;
412 if ((cp[p->rn_offset] & p->rn_bmask) == 0)
413 p->rn_left = t;
414 else
415 p->rn_right = t;
416 x->rn_parent = t;
417 t->rn_parent = p; /* frees x, p as temp vars below */
418 if ((cp[t->rn_offset] & t->rn_bmask) == 0) {
419 t->rn_right = x;
420 } else {
421 t->rn_right = tt;
422 t->rn_left = x;
423 }
424#ifdef RN_DEBUG
425 if (rn_debug)
426 log(LOG_DEBUG, "rn_insert: Coming Out:\n"), traverse(p);
427#endif
428 }
429 return (tt);
430}
431
432struct radix_node *
b4628cf9
SZ
433rn_addmask(char *netmask, boolean_t search, int skip,
434 struct radix_node_head *mask_rnh)
984263bc 435{
2e9572df
JH
436 struct radix_node *x, *saved_x;
437 char *cp, *cplim;
ef87f48d
JH
438 int b = 0, mlen, m0, j;
439 boolean_t maskduplicated, isnormal;
ecdefdda 440 char *addmask_key;
984263bc 441
70cef922
MD
442 if ((mlen = clen(netmask)) > RN_MAXKEYLEN)
443 mlen = RN_MAXKEYLEN;
984263bc
MD
444 if (skip == 0)
445 skip = 1;
446 if (mlen <= skip)
ac0f13c5 447 return (mask_rnh->rnh_nodes);
70cef922 448 R_Malloc(addmask_key, char *, RN_MAXKEYLEN);
ecdefdda
MD
449 if (addmask_key == NULL)
450 return NULL;
984263bc 451 if (skip > 1)
2e9572df 452 bcopy(rn_ones + 1, addmask_key + 1, skip - 1);
984263bc 453 if ((m0 = mlen) > skip)
2e9572df 454 bcopy(netmask + skip, addmask_key + skip, mlen - skip);
984263bc
MD
455 /*
456 * Trim trailing zeroes.
457 */
458 for (cp = addmask_key + mlen; (cp > addmask_key) && cp[-1] == 0;)
459 cp--;
460 mlen = cp - addmask_key;
461 if (mlen <= skip) {
5909f744
SZ
462 if (m0 >= mask_rnh->rnh_last_zeroed)
463 mask_rnh->rnh_last_zeroed = mlen;
ecdefdda 464 Free(addmask_key);
ac0f13c5 465 return (mask_rnh->rnh_nodes);
984263bc 466 }
5909f744
SZ
467 if (m0 < mask_rnh->rnh_last_zeroed)
468 bzero(addmask_key + m0, mask_rnh->rnh_last_zeroed - m0);
469 *addmask_key = mask_rnh->rnh_last_zeroed = mlen;
ac0f13c5 470 x = rn_search(addmask_key, mask_rnh->rnh_treetop);
70cef922
MD
471 if (x->rn_key == NULL) {
472 kprintf("WARNING: radix_node->rn_key is NULL rn=%p\n", x);
473 print_backtrace(-1);
2e9572df 474 x = NULL;
70cef922
MD
475 } else if (bcmp(addmask_key, x->rn_key, mlen) != 0) {
476 x = NULL;
477 }
2e9572df 478 if (x != NULL || search)
ecdefdda 479 goto out;
70cef922 480 R_Malloc(x, struct radix_node *, RN_MAXKEYLEN + 2 * (sizeof *x));
2e9572df 481 if ((saved_x = x) == NULL)
ecdefdda 482 goto out;
70cef922 483 bzero(x, RN_MAXKEYLEN + 2 * (sizeof *x));
2e9572df
JH
484 netmask = cp = (char *)(x + 2);
485 bcopy(addmask_key, cp, mlen);
ac0f13c5 486 x = rn_insert(cp, mask_rnh, &maskduplicated, x);
984263bc
MD
487 if (maskduplicated) {
488 log(LOG_ERR, "rn_addmask: mask impossibly already in tree");
489 Free(saved_x);
ecdefdda 490 goto out;
984263bc
MD
491 }
492 /*
493 * Calculate index of mask, and check for normalcy.
494 */
ef87f48d
JH
495 isnormal = TRUE;
496 cplim = netmask + mlen;
2e9572df 497 for (cp = netmask + skip; cp < cplim && clen(cp) == 0xff;)
984263bc
MD
498 cp++;
499 if (cp != cplim) {
f23061d4
JH
500 static const char normal_chars[] = {
501 0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, -1
502 };
503
984263bc
MD
504 for (j = 0x80; (j & *cp) != 0; j >>= 1)
505 b++;
506 if (*cp != normal_chars[b] || cp != (cplim - 1))
ef87f48d 507 isnormal = FALSE;
984263bc
MD
508 }
509 b += (cp - netmask) << 3;
510 x->rn_bit = -1 - b;
511 if (isnormal)
512 x->rn_flags |= RNF_NORMAL;
ecdefdda
MD
513out:
514 Free(addmask_key);
984263bc
MD
515 return (x);
516}
517
3bf25ce1
SW
518/* XXX: arbitrary ordering for non-contiguous masks */
519static boolean_t
2e9572df 520rn_lexobetter(char *mp, char *np)
984263bc 521{
2e9572df 522 char *lim;
984263bc 523
2e9572df
JH
524 if ((unsigned) *mp > (unsigned) *np)
525 return TRUE;/* not really, but need to check longer one first */
984263bc 526 if (*mp == *np)
2e9572df 527 for (lim = mp + clen(mp); mp < lim;)
984263bc 528 if (*mp++ > *np++)
2e9572df
JH
529 return TRUE;
530 return FALSE;
984263bc
MD
531}
532
533static struct radix_mask *
2e9572df 534rn_new_radix_mask(struct radix_node *tt, struct radix_mask *nextmask)
984263bc 535{
82ed7fc2 536 struct radix_mask *m;
984263bc 537
5909f744 538 m = MKGet(&rn_mkfreelist[mycpuid]);
2e9572df 539 if (m == NULL) {
984263bc 540 log(LOG_ERR, "Mask for route not entered\n");
2e9572df 541 return (NULL);
984263bc 542 }
2e9572df 543 bzero(m, sizeof *m);
984263bc
MD
544 m->rm_bit = tt->rn_bit;
545 m->rm_flags = tt->rn_flags;
546 if (tt->rn_flags & RNF_NORMAL)
547 m->rm_leaf = tt;
548 else
549 m->rm_mask = tt->rn_mask;
2e9572df 550 m->rm_next = nextmask;
984263bc
MD
551 tt->rn_mklist = m;
552 return m;
553}
554
555struct radix_node *
2e9572df
JH
556rn_addroute(char *key, char *netmask, struct radix_node_head *head,
557 struct radix_node treenodes[2])
984263bc 558{
2e9572df 559 struct radix_node *t, *x = NULL, *tt;
984263bc
MD
560 struct radix_node *saved_tt, *top = head->rnh_treetop;
561 short b = 0, b_leaf = 0;
2e9572df
JH
562 boolean_t keyduplicated;
563 char *mmask;
984263bc
MD
564 struct radix_mask *m, **mp;
565
566 /*
567 * In dealing with non-contiguous masks, there may be
568 * many different routes which have the same mask.
569 * We will find it useful to have a unique pointer to
570 * the mask to speed avoiding duplicate references at
571 * nodes and possibly save time in calculating indices.
572 */
2e9572df 573 if (netmask != NULL) {
b4628cf9
SZ
574 if ((x = rn_addmask(netmask, FALSE, top->rn_offset,
575 head->rnh_maskhead)) == NULL)
2e9572df 576 return (NULL);
984263bc
MD
577 b_leaf = x->rn_bit;
578 b = -1 - x->rn_bit;
579 netmask = x->rn_key;
580 }
581 /*
582 * Deal with duplicated keys: attach node to previous instance
583 */
2e9572df 584 saved_tt = tt = rn_insert(key, head, &keyduplicated, treenodes);
984263bc
MD
585 if (keyduplicated) {
586 for (t = tt; tt; t = tt, tt = tt->rn_dupedkey) {
587 if (tt->rn_mask == netmask)
2e9572df
JH
588 return (NULL);
589 if (netmask == NULL ||
984263bc
MD
590 (tt->rn_mask &&
591 ((b_leaf < tt->rn_bit) /* index(netmask) > node */
592 || rn_refines(netmask, tt->rn_mask)
593 || rn_lexobetter(netmask, tt->rn_mask))))
594 break;
595 }
596 /*
597 * If the mask is not duplicated, we wouldn't
598 * find it among possible duplicate key entries
599 * anyway, so the above test doesn't hurt.
600 *
601 * We sort the masks for a duplicated key the same way as
602 * in a masklist -- most specific to least specific.
603 * This may require the unfortunate nuisance of relocating
604 * the head of the list.
605 */
606 if (tt == saved_tt) {
607 struct radix_node *xx = x;
608 /* link in at head of list */
609 (tt = treenodes)->rn_dupedkey = t;
610 tt->rn_flags = t->rn_flags;
611 tt->rn_parent = x = t->rn_parent;
f23061d4 612 t->rn_parent = tt; /* parent */
984263bc
MD
613 if (x->rn_left == t)
614 x->rn_left = tt;
615 else
616 x->rn_right = tt;
617 saved_tt = tt; x = xx;
618 } else {
619 (tt = treenodes)->rn_dupedkey = t->rn_dupedkey;
620 t->rn_dupedkey = tt;
621 tt->rn_parent = t; /* parent */
2e9572df 622 if (tt->rn_dupedkey != NULL) /* parent */
984263bc
MD
623 tt->rn_dupedkey->rn_parent = tt; /* parent */
624 }
625#ifdef RN_DEBUG
626 t=tt+1; tt->rn_info = rn_nodenum++; t->rn_info = rn_nodenum++;
627 tt->rn_twin = t; tt->rn_ybro = rn_clist; rn_clist = tt;
628#endif
2e9572df 629 tt->rn_key = key;
984263bc
MD
630 tt->rn_bit = -1;
631 tt->rn_flags = RNF_ACTIVE;
632 }
633 /*
634 * Put mask in tree.
635 */
2e9572df 636 if (netmask != NULL) {
984263bc
MD
637 tt->rn_mask = netmask;
638 tt->rn_bit = x->rn_bit;
639 tt->rn_flags |= x->rn_flags & RNF_NORMAL;
640 }
641 t = saved_tt->rn_parent;
642 if (keyduplicated)
643 goto on2;
644 b_leaf = -1 - t->rn_bit;
645 if (t->rn_right == saved_tt)
646 x = t->rn_left;
647 else
648 x = t->rn_right;
649 /* Promote general routes from below */
650 if (x->rn_bit < 0) {
2e9572df
JH
651 mp = &t->rn_mklist;
652 while (x != NULL) {
653 if (x->rn_mask != NULL &&
654 x->rn_bit >= b_leaf &&
655 x->rn_mklist == NULL) {
656 *mp = m = rn_new_radix_mask(x, NULL);
657 if (m != NULL)
658 mp = &m->rm_next;
659 }
660 x = x->rn_dupedkey;
984263bc 661 }
2e9572df 662 } else if (x->rn_mklist != NULL) {
984263bc
MD
663 /*
664 * Skip over masks whose index is > that of new node
665 */
2e9572df 666 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_next)
984263bc
MD
667 if (m->rm_bit >= b_leaf)
668 break;
2e9572df
JH
669 t->rn_mklist = m;
670 *mp = NULL;
984263bc
MD
671 }
672on2:
673 /* Add new route to highest possible ancestor's list */
2e9572df 674 if ((netmask == NULL) || (b > t->rn_bit ))
984263bc
MD
675 return tt; /* can't lift at all */
676 b_leaf = tt->rn_bit;
677 do {
678 x = t;
679 t = t->rn_parent;
680 } while (b <= t->rn_bit && x != top);
681 /*
682 * Search through routes associated with node to
683 * insert new route according to index.
684 * Need same criteria as when sorting dupedkeys to avoid
685 * double loop on deletion.
686 */
2e9572df 687 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_next) {
984263bc
MD
688 if (m->rm_bit < b_leaf)
689 continue;
690 if (m->rm_bit > b_leaf)
691 break;
692 if (m->rm_flags & RNF_NORMAL) {
693 mmask = m->rm_leaf->rn_mask;
694 if (tt->rn_flags & RNF_NORMAL) {
695 log(LOG_ERR,
696 "Non-unique normal route, mask not entered\n");
697 return tt;
698 }
699 } else
700 mmask = m->rm_mask;
701 if (mmask == netmask) {
702 m->rm_refs++;
703 tt->rn_mklist = m;
704 return tt;
705 }
2e9572df 706 if (rn_refines(netmask, mmask) || rn_lexobetter(netmask, mmask))
984263bc
MD
707 break;
708 }
709 *mp = rn_new_radix_mask(tt, *mp);
710 return tt;
711}
712
713struct radix_node *
2e9572df 714rn_delete(char *key, char *netmask, struct radix_node_head *head)
984263bc 715{
82ed7fc2 716 struct radix_node *t, *p, *x, *tt;
984263bc
MD
717 struct radix_mask *m, *saved_m, **mp;
718 struct radix_node *dupedkey, *saved_tt, *top;
2e9572df 719 int b, head_off, klen;
5909f744 720 int cpu = mycpuid;
984263bc 721
984263bc 722 x = head->rnh_treetop;
2e9572df 723 tt = rn_search(key, x);
984263bc 724 head_off = x->rn_offset;
2e9572df 725 klen = clen(key);
984263bc
MD
726 saved_tt = tt;
727 top = x;
2e9572df
JH
728 if (tt == NULL ||
729 bcmp(key + head_off, tt->rn_key + head_off, klen - head_off))
730 return (NULL);
984263bc
MD
731 /*
732 * Delete our route from mask lists.
733 */
2e9572df 734 if (netmask != NULL) {
b4628cf9
SZ
735 if ((x = rn_addmask(netmask, TRUE, head_off,
736 head->rnh_maskhead)) == NULL)
2e9572df 737 return (NULL);
984263bc
MD
738 netmask = x->rn_key;
739 while (tt->rn_mask != netmask)
2e9572df
JH
740 if ((tt = tt->rn_dupedkey) == NULL)
741 return (NULL);
984263bc 742 }
2e9572df 743 if (tt->rn_mask == NULL || (saved_m = m = tt->rn_mklist) == NULL)
984263bc
MD
744 goto on1;
745 if (tt->rn_flags & RNF_NORMAL) {
746 if (m->rm_leaf != tt || m->rm_refs > 0) {
747 log(LOG_ERR, "rn_delete: inconsistent annotation\n");
2e9572df 748 return (NULL); /* dangling ref could cause disaster */
984263bc
MD
749 }
750 } else {
751 if (m->rm_mask != tt->rn_mask) {
752 log(LOG_ERR, "rn_delete: inconsistent annotation\n");
753 goto on1;
754 }
755 if (--m->rm_refs >= 0)
756 goto on1;
757 }
758 b = -1 - tt->rn_bit;
759 t = saved_tt->rn_parent;
760 if (b > t->rn_bit)
761 goto on1; /* Wasn't lifted at all */
762 do {
763 x = t;
764 t = t->rn_parent;
765 } while (b <= t->rn_bit && x != top);
2e9572df 766 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_next)
984263bc 767 if (m == saved_m) {
2e9572df 768 *mp = m->rm_next;
5909f744 769 MKFree(&rn_mkfreelist[cpu], m);
984263bc
MD
770 break;
771 }
2e9572df 772 if (m == NULL) {
984263bc
MD
773 log(LOG_ERR, "rn_delete: couldn't find our annotation\n");
774 if (tt->rn_flags & RNF_NORMAL)
2e9572df 775 return (NULL); /* Dangling ref to us */
984263bc
MD
776 }
777on1:
778 /*
779 * Eliminate us from tree
780 */
781 if (tt->rn_flags & RNF_ROOT)
2e9572df 782 return (NULL);
984263bc
MD
783#ifdef RN_DEBUG
784 /* Get us out of the creation list */
785 for (t = rn_clist; t && t->rn_ybro != tt; t = t->rn_ybro) {}
786 if (t) t->rn_ybro = tt->rn_ybro;
787#endif
788 t = tt->rn_parent;
789 dupedkey = saved_tt->rn_dupedkey;
2e9572df 790 if (dupedkey != NULL) {
984263bc
MD
791 /*
792 * at this point, tt is the deletion target and saved_tt
793 * is the head of the dupekey chain
794 */
795 if (tt == saved_tt) {
796 /* remove from head of chain */
797 x = dupedkey; x->rn_parent = t;
798 if (t->rn_left == tt)
799 t->rn_left = x;
800 else
801 t->rn_right = x;
802 } else {
803 /* find node in front of tt on the chain */
804 for (x = p = saved_tt; p && p->rn_dupedkey != tt;)
805 p = p->rn_dupedkey;
806 if (p) {
807 p->rn_dupedkey = tt->rn_dupedkey;
808 if (tt->rn_dupedkey) /* parent */
809 tt->rn_dupedkey->rn_parent = p;
810 /* parent */
811 } else log(LOG_ERR, "rn_delete: couldn't find us\n");
812 }
813 t = tt + 1;
814 if (t->rn_flags & RNF_ACTIVE) {
815#ifndef RN_DEBUG
816 *++x = *t;
817 p = t->rn_parent;
818#else
819 b = t->rn_info;
820 *++x = *t;
821 t->rn_info = b;
822 p = t->rn_parent;
823#endif
824 if (p->rn_left == t)
825 p->rn_left = x;
826 else
827 p->rn_right = x;
828 x->rn_left->rn_parent = x;
829 x->rn_right->rn_parent = x;
830 }
831 goto out;
832 }
833 if (t->rn_left == tt)
834 x = t->rn_right;
835 else
836 x = t->rn_left;
837 p = t->rn_parent;
838 if (p->rn_right == t)
839 p->rn_right = x;
840 else
841 p->rn_left = x;
842 x->rn_parent = p;
843 /*
844 * Demote routes attached to us.
845 */
2e9572df 846 if (t->rn_mklist != NULL) {
984263bc
MD
847 if (x->rn_bit >= 0) {
848 for (mp = &x->rn_mklist; (m = *mp);)
2e9572df 849 mp = &m->rm_next;
984263bc
MD
850 *mp = t->rn_mklist;
851 } else {
f23061d4
JH
852 /*
853 * If there are any (key, mask) pairs in a sibling
854 * duped-key chain, some subset will appear sorted
855 * in the same order attached to our mklist.
856 */
984263bc
MD
857 for (m = t->rn_mklist; m && x; x = x->rn_dupedkey)
858 if (m == x->rn_mklist) {
2e9572df
JH
859 struct radix_mask *mm = m->rm_next;
860
861 x->rn_mklist = NULL;
984263bc 862 if (--(m->rm_refs) < 0)
5909f744 863 MKFree(&rn_mkfreelist[cpu], m);
984263bc
MD
864 m = mm;
865 }
866 if (m)
867 log(LOG_ERR,
868 "rn_delete: Orphaned Mask %p at %p\n",
869 (void *)m, (void *)x);
870 }
871 }
872 /*
873 * We may be holding an active internal node in the tree.
874 */
875 x = tt + 1;
876 if (t != x) {
877#ifndef RN_DEBUG
878 *t = *x;
879#else
880 b = t->rn_info;
881 *t = *x;
882 t->rn_info = b;
883#endif
884 t->rn_left->rn_parent = t;
885 t->rn_right->rn_parent = t;
886 p = x->rn_parent;
887 if (p->rn_left == x)
888 p->rn_left = t;
889 else
890 p->rn_right = t;
891 }
892out:
893 tt->rn_flags &= ~RNF_ACTIVE;
894 tt[1].rn_flags &= ~RNF_ACTIVE;
895 return (tt);
896}
897
898/*
899 * This is the same as rn_walktree() except for the parameters and the
900 * exit.
901 */
902static int
f23061d4 903rn_walktree_from(struct radix_node_head *h, char *xa, char *xm,
2e9572df 904 walktree_f_t *f, void *w)
984263bc 905{
984263bc 906 struct radix_node *base, *next;
2e9572df 907 struct radix_node *rn, *last = NULL /* shut up gcc */;
f23061d4 908 boolean_t stopping = FALSE;
2e9572df 909 int lastb, error;
984263bc
MD
910
911 /*
912 * rn_search_m is sort-of-open-coded here.
913 */
4b1cf444 914 /* kprintf("about to search\n"); */
984263bc
MD
915 for (rn = h->rnh_treetop; rn->rn_bit >= 0; ) {
916 last = rn;
4b1cf444 917 /* kprintf("rn_bit %d, rn_bmask %x, xm[rn_offset] %x\n",
984263bc
MD
918 rn->rn_bit, rn->rn_bmask, xm[rn->rn_offset]); */
919 if (!(rn->rn_bmask & xm[rn->rn_offset])) {
920 break;
921 }
922 if (rn->rn_bmask & xa[rn->rn_offset]) {
923 rn = rn->rn_right;
924 } else {
925 rn = rn->rn_left;
926 }
927 }
4b1cf444 928 /* kprintf("done searching\n"); */
984263bc
MD
929
930 /*
931 * Two cases: either we stepped off the end of our mask,
932 * in which case last == rn, or we reached a leaf, in which
933 * case we want to start from the last node we looked at.
934 * Either way, last is the node we want to start from.
935 */
936 rn = last;
937 lastb = rn->rn_bit;
938
4b1cf444 939 /* kprintf("rn %p, lastb %d\n", rn, lastb);*/
984263bc
MD
940
941 /*
942 * This gets complicated because we may delete the node
943 * while applying the function f to it, so we need to calculate
944 * the successor node in advance.
945 */
946 while (rn->rn_bit >= 0)
947 rn = rn->rn_left;
948
949 while (!stopping) {
4b1cf444 950 /* kprintf("node %p (%d)\n", rn, rn->rn_bit); */
984263bc
MD
951 base = rn;
952 /* If at right child go back up, otherwise, go right */
2e9572df
JH
953 while (rn->rn_parent->rn_right == rn &&
954 !(rn->rn_flags & RNF_ROOT)) {
984263bc
MD
955 rn = rn->rn_parent;
956
957 /* if went up beyond last, stop */
958 if (rn->rn_bit < lastb) {
f23061d4 959 stopping = TRUE;
4b1cf444 960 /* kprintf("up too far\n"); */
984263bc
MD
961 }
962 }
963
964 /* Find the next *leaf* since next node might vanish, too */
965 for (rn = rn->rn_parent->rn_right; rn->rn_bit >= 0;)
966 rn = rn->rn_left;
967 next = rn;
968 /* Process leaves */
2e9572df 969 while ((rn = base) != NULL) {
984263bc 970 base = rn->rn_dupedkey;
4b1cf444 971 /* kprintf("leaf %p\n", rn); */
2e9572df 972 if (!(rn->rn_flags & RNF_ROOT) && (error = (*f)(rn, w)))
984263bc
MD
973 return (error);
974 }
975 rn = next;
976
977 if (rn->rn_flags & RNF_ROOT) {
4b1cf444 978 /* kprintf("root, stopping"); */
f23061d4 979 stopping = TRUE;
984263bc
MD
980 }
981
982 }
983 return 0;
984}
985
986static int
291dd55b
SZ
987rn_walktree_at(struct radix_node_head *h, const char *a, const char *m,
988 walktree_f_t *f, void *w)
984263bc 989{
984263bc 990 struct radix_node *base, *next;
82ed7fc2 991 struct radix_node *rn = h->rnh_treetop;
2e9572df
JH
992 int error;
993
984263bc
MD
994 /*
995 * This gets complicated because we may delete the node
996 * while applying the function f to it, so we need to calculate
997 * the successor node in advance.
998 */
291dd55b
SZ
999 if (a == NULL) {
1000 /* First time through node, go left */
1001 while (rn->rn_bit >= 0)
1002 rn = rn->rn_left;
1003 } else {
1004 if (m != NULL)
1005 rn = rn_search_m(a, rn, m);
1006 else
1007 rn = rn_search(a, rn);
1008 }
984263bc
MD
1009 for (;;) {
1010 base = rn;
1011 /* If at right child go back up, otherwise, go right */
2e9572df
JH
1012 while (rn->rn_parent->rn_right == rn &&
1013 !(rn->rn_flags & RNF_ROOT))
984263bc
MD
1014 rn = rn->rn_parent;
1015 /* Find the next *leaf* since next node might vanish, too */
1016 for (rn = rn->rn_parent->rn_right; rn->rn_bit >= 0;)
1017 rn = rn->rn_left;
1018 next = rn;
1019 /* Process leaves */
1020 while ((rn = base)) {
1021 base = rn->rn_dupedkey;
2e9572df 1022 if (!(rn->rn_flags & RNF_ROOT) && (error = (*f)(rn, w)))
984263bc
MD
1023 return (error);
1024 }
1025 rn = next;
1026 if (rn->rn_flags & RNF_ROOT)
1027 return (0);
1028 }
1029 /* NOTREACHED */
1030}
1031
291dd55b
SZ
1032static int
1033rn_walktree(struct radix_node_head *h, walktree_f_t *f, void *w)
1034{
1035 return rn_walktree_at(h, NULL, NULL, f, w);
1036}
1037
984263bc 1038int
b4628cf9 1039rn_inithead(void **head, struct radix_node_head *maskhead, int off)
984263bc 1040{
82ed7fc2 1041 struct radix_node_head *rnh;
f23061d4 1042 struct radix_node *root, *left, *right;
2e9572df 1043
5fe66e68 1044 if (*head != NULL) /* already initialized */
984263bc 1045 return (1);
5fe66e68
JH
1046
1047 R_Malloc(rnh, struct radix_node_head *, sizeof *rnh);
2e9572df 1048 if (rnh == NULL)
984263bc 1049 return (0);
5fe66e68 1050 bzero(rnh, sizeof *rnh);
984263bc 1051 *head = rnh;
2e9572df 1052
f23061d4 1053 root = rn_newpair(rn_zeros, off, rnh->rnh_nodes);
5fe66e68 1054 right = &rnh->rnh_nodes[2];
f23061d4
JH
1055 root->rn_parent = root;
1056 root->rn_flags = RNF_ROOT | RNF_ACTIVE;
1057 root->rn_right = right;
2e9572df 1058
f23061d4 1059 left = root->rn_left;
2e9572df 1060 left->rn_bit = -1 - off;
f23061d4 1061 left->rn_flags = RNF_ROOT | RNF_ACTIVE;
2e9572df
JH
1062
1063 *right = *left;
1064 right->rn_key = rn_ones;
1065
f23061d4 1066 rnh->rnh_treetop = root;
b4628cf9 1067 rnh->rnh_maskhead = maskhead;
0c3c561c 1068
984263bc
MD
1069 rnh->rnh_addaddr = rn_addroute;
1070 rnh->rnh_deladdr = rn_delete;
1071 rnh->rnh_matchaddr = rn_match;
1072 rnh->rnh_lookup = rn_lookup;
1073 rnh->rnh_walktree = rn_walktree;
1074 rnh->rnh_walktree_from = rn_walktree_from;
291dd55b 1075 rnh->rnh_walktree_at = rn_walktree_at;
2e9572df 1076
984263bc
MD
1077 return (1);
1078}
1079
43dbcc2a
SZ
1080static void
1081rn_init_handler(netmsg_t msg)
1082{
1083 int cpu = mycpuid;
1084
1085 ASSERT_NETISR_NCPUS(cpu);
1086 if (rn_inithead((void **)&mask_rnheads[cpu], NULL, 0) == 0)
1087 panic("rn_init 2");
1088
1089 netisr_forwardmsg(&msg->base, cpu + 1);
1090}
1091
984263bc 1092void
3bf25ce1 1093rn_init(void)
984263bc 1094{
43dbcc2a 1095 struct netmsg_base msg;
984263bc
MD
1096#ifdef _KERNEL
1097 struct domain *dom;
1098
70cef922
MD
1099 SLIST_FOREACH(dom, &domains, dom_next) {
1100 if (dom->dom_maxrtkey > RN_MAXKEYLEN) {
ed20d0e3 1101 panic("domain %s maxkey too big %d/%d",
70cef922
MD
1102 dom->dom_name, dom->dom_maxrtkey, RN_MAXKEYLEN);
1103 }
984263bc 1104 }
70cef922 1105#endif
43dbcc2a
SZ
1106 netmsg_init(&msg, NULL, &curthread->td_msgport, 0, rn_init_handler);
1107 netisr_domsg_global(&msg);
984263bc 1108}
b4628cf9
SZ
1109
1110struct radix_node_head *
1111rn_cpumaskhead(int cpu)
1112{
43dbcc2a
SZ
1113
1114 ASSERT_NETISR_NCPUS(cpu);
b4628cf9
SZ
1115 KKASSERT(mask_rnheads[cpu] != NULL);
1116 return mask_rnheads[cpu];
1117}