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29 * @(#)radix.c 8.5 (Berkeley) 5/19/95
34 * Routines to build and maintain radix trees for routing lookups.
36 #include <sys/param.h>
39 #include <sys/mutex.h>
40 #include <sys/rwlock.h>
41 #include <sys/systm.h>
42 #include <sys/malloc.h>
43 #include <sys/syslog.h>
44 #include <net/radix.h>
45 #include "opt_mpath.h"
47 #include <net/radix_mpath.h>
53 #define log(x, arg...) fprintf(stderr, ## arg)
54 #define panic(x) fprintf(stderr, "PANIC: %s", x), exit(1)
55 #define min(a, b) ((a) < (b) ? (a) : (b) )
56 #include <net/radix.h>
59 static int rn_walktree_from(struct radix_node_head *h, void *a, void *m,
60 walktree_f_t *f, void *w);
61 static int rn_walktree(struct radix_node_head *, walktree_f_t *, void *);
62 static struct radix_node
63 *rn_insert(void *, struct radix_node_head *, int *,
64 struct radix_node [2]),
65 *rn_newpair(void *, int, struct radix_node[2]),
66 *rn_search(void *, struct radix_node *),
67 *rn_search_m(void *, struct radix_node *, void *);
69 static void rn_detachhead_internal(void **head);
70 static int rn_inithead_internal(void **head, int off);
72 #define RADIX_MAX_KEY_LEN 32
74 static char rn_zeros[RADIX_MAX_KEY_LEN];
75 static char rn_ones[RADIX_MAX_KEY_LEN] = {
76 -1, -1, -1, -1, -1, -1, -1, -1,
77 -1, -1, -1, -1, -1, -1, -1, -1,
78 -1, -1, -1, -1, -1, -1, -1, -1,
79 -1, -1, -1, -1, -1, -1, -1, -1,
83 * XXX: Compat stuff for old rn_addmask() users
85 static struct radix_node_head *mask_rnhead_compat;
87 static struct mtx mask_mtx;
91 static int rn_lexobetter(void *m_arg, void *n_arg);
92 static struct radix_mask *
93 rn_new_radix_mask(struct radix_node *tt,
94 struct radix_mask *next);
95 static int rn_satisfies_leaf(char *trial, struct radix_node *leaf,
99 * The data structure for the keys is a radix tree with one way
100 * branching removed. The index rn_bit at an internal node n represents a bit
101 * position to be tested. The tree is arranged so that all descendants
102 * of a node n have keys whose bits all agree up to position rn_bit - 1.
103 * (We say the index of n is rn_bit.)
105 * There is at least one descendant which has a one bit at position rn_bit,
106 * and at least one with a zero there.
108 * A route is determined by a pair of key and mask. We require that the
109 * bit-wise logical and of the key and mask to be the key.
110 * We define the index of a route to associated with the mask to be
111 * the first bit number in the mask where 0 occurs (with bit number 0
112 * representing the highest order bit).
114 * We say a mask is normal if every bit is 0, past the index of the mask.
115 * If a node n has a descendant (k, m) with index(m) == index(n) == rn_bit,
116 * and m is a normal mask, then the route applies to every descendant of n.
117 * If the index(m) < rn_bit, this implies the trailing last few bits of k
118 * before bit b are all 0, (and hence consequently true of every descendant
119 * of n), so the route applies to all descendants of the node as well.
121 * Similar logic shows that a non-normal mask m such that
122 * index(m) <= index(n) could potentially apply to many children of n.
123 * Thus, for each non-host route, we attach its mask to a list at an internal
124 * node as high in the tree as we can go.
126 * The present version of the code makes use of normal routes in short-
127 * circuiting an explict mask and compare operation when testing whether
128 * a key satisfies a normal route, and also in remembering the unique leaf
129 * that governs a subtree.
133 * Most of the functions in this code assume that the key/mask arguments
134 * are sockaddr-like structures, where the first byte is an u_char
135 * indicating the size of the entire structure.
137 * To make the assumption more explicit, we use the LEN() macro to access
138 * this field. It is safe to pass an expression with side effects
139 * to LEN() as the argument is evaluated only once.
140 * We cast the result to int as this is the dominant usage.
142 #define LEN(x) ( (int) (*(const u_char *)(x)) )
145 * XXX THIS NEEDS TO BE FIXED
146 * In the code, pointers to keys and masks are passed as either
147 * 'void *' (because callers use to pass pointers of various kinds), or
148 * 'caddr_t' (which is fine for pointer arithmetics, but not very
149 * clean when you dereference it to access data). Furthermore, caddr_t
150 * is really 'char *', while the natural type to operate on keys and
151 * masks would be 'u_char'. This mismatch require a lot of casts and
152 * intermediate variables to adapt types that clutter the code.
156 * Search a node in the tree matching the key.
158 static struct radix_node *
159 rn_search(v_arg, head)
161 struct radix_node *head;
163 register struct radix_node *x;
166 for (x = head, v = v_arg; x->rn_bit >= 0;) {
167 if (x->rn_bmask & v[x->rn_offset])
176 * Same as above, but with an additional mask.
177 * XXX note this function is used only once.
179 static struct radix_node *
180 rn_search_m(v_arg, head, m_arg)
181 struct radix_node *head;
184 register struct radix_node *x;
185 register caddr_t v = v_arg, m = m_arg;
187 for (x = head; x->rn_bit >= 0;) {
188 if ((x->rn_bmask & m[x->rn_offset]) &&
189 (x->rn_bmask & v[x->rn_offset]))
198 rn_refines(m_arg, n_arg)
201 register caddr_t m = m_arg, n = n_arg;
202 register caddr_t lim, lim2 = lim = n + LEN(n);
203 int longer = LEN(n++) - LEN(m++);
204 int masks_are_equal = 1;
217 if (masks_are_equal && (longer < 0))
218 for (lim2 = m - longer; m < lim2; )
221 return (!masks_are_equal);
225 rn_lookup(v_arg, m_arg, head)
227 struct radix_node_head *head;
229 register struct radix_node *x;
233 x = rn_addmask_r(m_arg, head->rnh_masks, 1,
234 head->rnh_treetop->rn_offset);
239 x = rn_match(v_arg, head);
241 while (x && x->rn_mask != netmask)
248 rn_satisfies_leaf(trial, leaf, skip)
250 register struct radix_node *leaf;
253 register char *cp = trial, *cp2 = leaf->rn_key, *cp3 = leaf->rn_mask;
255 int length = min(LEN(cp), LEN(cp2));
260 length = min(length, LEN(cp3));
261 cplim = cp + length; cp3 += skip; cp2 += skip;
262 for (cp += skip; cp < cplim; cp++, cp2++, cp3++)
263 if ((*cp ^ *cp2) & *cp3)
269 rn_match(v_arg, head)
271 struct radix_node_head *head;
274 register struct radix_node *t = head->rnh_treetop, *x;
275 register caddr_t cp = v, cp2;
277 struct radix_node *saved_t, *top = t;
278 int off = t->rn_offset, vlen = LEN(cp), matched_off;
279 register int test, b, rn_bit;
282 * Open code rn_search(v, top) to avoid overhead of extra
285 for (; t->rn_bit >= 0; ) {
286 if (t->rn_bmask & cp[t->rn_offset])
292 * See if we match exactly as a host destination
293 * or at least learn how many bits match, for normal mask finesse.
295 * It doesn't hurt us to limit how many bytes to check
296 * to the length of the mask, since if it matches we had a genuine
297 * match and the leaf we have is the most specific one anyway;
298 * if it didn't match with a shorter length it would fail
299 * with a long one. This wins big for class B&C netmasks which
300 * are probably the most common case...
303 vlen = *(u_char *)t->rn_mask;
304 cp += off; cp2 = t->rn_key + off; cplim = v + vlen;
305 for (; cp < cplim; cp++, cp2++)
309 * This extra grot is in case we are explicitly asked
310 * to look up the default. Ugh!
312 * Never return the root node itself, it seems to cause a
315 if (t->rn_flags & RNF_ROOT)
319 test = (*cp ^ *cp2) & 0xff; /* find first bit that differs */
320 for (b = 7; (test >>= 1) > 0;)
322 matched_off = cp - v;
323 b += matched_off << 3;
326 * If there is a host route in a duped-key chain, it will be first.
328 if ((saved_t = t)->rn_mask == 0)
330 for (; t; t = t->rn_dupedkey)
332 * Even if we don't match exactly as a host,
333 * we may match if the leaf we wound up at is
336 if (t->rn_flags & RNF_NORMAL) {
337 if (rn_bit <= t->rn_bit)
339 } else if (rn_satisfies_leaf(v, t, matched_off))
342 /* start searching up the tree */
344 register struct radix_mask *m;
348 * If non-contiguous masks ever become important
349 * we can restore the masking and open coding of
350 * the search and satisfaction test and put the
351 * calculation of "off" back before the "do".
354 if (m->rm_flags & RNF_NORMAL) {
355 if (rn_bit <= m->rm_bit)
358 off = min(t->rn_offset, matched_off);
359 x = rn_search_m(v, t, m->rm_mask);
360 while (x && x->rn_mask != m->rm_mask)
362 if (x && rn_satisfies_leaf(v, x, off))
373 struct radix_node *rn_clist;
379 * Whenever we add a new leaf to the tree, we also add a parent node,
380 * so we allocate them as an array of two elements: the first one must be
381 * the leaf (see RNTORT() in route.c), the second one is the parent.
382 * This routine initializes the relevant fields of the nodes, so that
383 * the leaf is the left child of the parent node, and both nodes have
384 * (almost) all all fields filled as appropriate.
385 * (XXX some fields are left unset, see the '#if 0' section).
386 * The function returns a pointer to the parent node.
389 static struct radix_node *
390 rn_newpair(v, b, nodes)
393 struct radix_node nodes[2];
395 register struct radix_node *tt = nodes, *t = tt + 1;
397 t->rn_bmask = 0x80 >> (b & 7);
399 t->rn_offset = b >> 3;
401 #if 0 /* XXX perhaps we should fill these fields as well. */
402 t->rn_parent = t->rn_right = NULL;
405 tt->rn_dupedkey = NULL;
409 tt->rn_key = (caddr_t)v;
411 tt->rn_flags = t->rn_flags = RNF_ACTIVE;
412 tt->rn_mklist = t->rn_mklist = 0;
414 tt->rn_info = rn_nodenum++; t->rn_info = rn_nodenum++;
416 tt->rn_ybro = rn_clist;
422 static struct radix_node *
423 rn_insert(v_arg, head, dupentry, nodes)
425 struct radix_node_head *head;
427 struct radix_node nodes[2];
430 struct radix_node *top = head->rnh_treetop;
431 int head_off = top->rn_offset, vlen = LEN(v);
432 register struct radix_node *t = rn_search(v_arg, top);
433 register caddr_t cp = v + head_off;
435 struct radix_node *tt;
437 * Find first bit at which v and t->rn_key differ
440 register caddr_t cp2 = t->rn_key + head_off;
441 register int cmp_res;
442 caddr_t cplim = v + vlen;
451 cmp_res = (cp[-1] ^ cp2[-1]) & 0xff;
452 for (b = (cp - v) << 3; cmp_res; b--)
456 register struct radix_node *p, *x = top;
460 if (cp[x->rn_offset] & x->rn_bmask)
464 } while (b > (unsigned) x->rn_bit);
465 /* x->rn_bit < b && x->rn_bit >= 0 */
468 log(LOG_DEBUG, "rn_insert: Going In:\n"), traverse(p);
470 t = rn_newpair(v_arg, b, nodes);
472 if ((cp[p->rn_offset] & p->rn_bmask) == 0)
477 t->rn_parent = p; /* frees x, p as temp vars below */
478 if ((cp[t->rn_offset] & t->rn_bmask) == 0) {
486 log(LOG_DEBUG, "rn_insert: Coming Out:\n"), traverse(p);
493 rn_addmask_r(void *arg, struct radix_node_head *maskhead, int search, int skip)
495 caddr_t netmask = (caddr_t)arg;
496 register struct radix_node *x;
497 register caddr_t cp, cplim;
498 register int b = 0, mlen, j;
499 int maskduplicated, isnormal;
500 struct radix_node *saved_x;
501 char addmask_key[RADIX_MAX_KEY_LEN];
503 if ((mlen = LEN(netmask)) > RADIX_MAX_KEY_LEN)
504 mlen = RADIX_MAX_KEY_LEN;
508 return (maskhead->rnh_nodes);
510 bzero(addmask_key, RADIX_MAX_KEY_LEN);
512 bcopy(rn_ones + 1, addmask_key + 1, skip - 1);
513 bcopy(netmask + skip, addmask_key + skip, mlen - skip);
515 * Trim trailing zeroes.
517 for (cp = addmask_key + mlen; (cp > addmask_key) && cp[-1] == 0;)
519 mlen = cp - addmask_key;
521 return (maskhead->rnh_nodes);
523 x = rn_search(addmask_key, maskhead->rnh_treetop);
524 if (bcmp(addmask_key, x->rn_key, mlen) != 0)
528 R_Zalloc(x, struct radix_node *, RADIX_MAX_KEY_LEN + 2 * sizeof (*x));
529 if ((saved_x = x) == 0)
531 netmask = cp = (caddr_t)(x + 2);
532 bcopy(addmask_key, cp, mlen);
533 x = rn_insert(cp, maskhead, &maskduplicated, x);
534 if (maskduplicated) {
535 log(LOG_ERR, "rn_addmask: mask impossibly already in tree");
540 * Calculate index of mask, and check for normalcy.
541 * First find the first byte with a 0 bit, then if there are
542 * more bits left (remember we already trimmed the trailing 0's),
543 * the pattern must be one of those in normal_chars[], or we have
544 * a non-contiguous mask.
546 cplim = netmask + mlen;
548 for (cp = netmask + skip; (cp < cplim) && *(u_char *)cp == 0xff;)
551 static char normal_chars[] = {
552 0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
554 for (j = 0x80; (j & *cp) != 0; j >>= 1)
556 if (*cp != normal_chars[b] || cp != (cplim - 1))
559 b += (cp - netmask) << 3;
562 x->rn_flags |= RNF_NORMAL;
567 rn_addmask(void *n_arg, int search, int skip)
569 struct radix_node *tt;
574 tt = rn_addmask_r(&mask_rnhead_compat, n_arg, search, skip);
577 mtx_unlock(&mask_mtx);
583 static int /* XXX: arbitrary ordering for non-contiguous masks */
584 rn_lexobetter(m_arg, n_arg)
587 register u_char *mp = m_arg, *np = n_arg, *lim;
589 if (LEN(mp) > LEN(np))
590 return 1; /* not really, but need to check longer one first */
591 if (LEN(mp) == LEN(np))
592 for (lim = mp + LEN(mp); mp < lim;)
598 static struct radix_mask *
599 rn_new_radix_mask(tt, next)
600 register struct radix_node *tt;
601 register struct radix_mask *next;
603 register struct radix_mask *m;
605 R_Malloc(m, struct radix_mask *, sizeof (struct radix_mask));
607 log(LOG_ERR, "Failed to allocate route mask\n");
610 bzero(m, sizeof(*m));
611 m->rm_bit = tt->rn_bit;
612 m->rm_flags = tt->rn_flags;
613 if (tt->rn_flags & RNF_NORMAL)
616 m->rm_mask = tt->rn_mask;
623 rn_addroute(v_arg, n_arg, head, treenodes)
625 struct radix_node_head *head;
626 struct radix_node treenodes[2];
628 caddr_t v = (caddr_t)v_arg, netmask = (caddr_t)n_arg;
629 register struct radix_node *t, *x = 0, *tt;
630 struct radix_node *saved_tt, *top = head->rnh_treetop;
631 short b = 0, b_leaf = 0;
634 struct radix_mask *m, **mp;
637 * In dealing with non-contiguous masks, there may be
638 * many different routes which have the same mask.
639 * We will find it useful to have a unique pointer to
640 * the mask to speed avoiding duplicate references at
641 * nodes and possibly save time in calculating indices.
644 x = rn_addmask_r(netmask, head->rnh_masks, 0, top->rn_offset);
652 * Deal with duplicated keys: attach node to previous instance
654 saved_tt = tt = rn_insert(v, head, &keyduplicated, treenodes);
656 for (t = tt; tt; t = tt, tt = tt->rn_dupedkey) {
658 /* permit multipath, if enabled for the family */
659 if (rn_mpath_capable(head) && netmask == tt->rn_mask) {
661 * go down to the end of multipaths, so that
662 * new entry goes into the end of rn_dupedkey
667 tt = tt->rn_dupedkey;
668 } while (tt && t->rn_mask == tt->rn_mask);
672 if (tt->rn_mask == netmask)
676 ((b_leaf < tt->rn_bit) /* index(netmask) > node */
677 || rn_refines(netmask, tt->rn_mask)
678 || rn_lexobetter(netmask, tt->rn_mask))))
682 * If the mask is not duplicated, we wouldn't
683 * find it among possible duplicate key entries
684 * anyway, so the above test doesn't hurt.
686 * We sort the masks for a duplicated key the same way as
687 * in a masklist -- most specific to least specific.
688 * This may require the unfortunate nuisance of relocating
689 * the head of the list.
691 * We also reverse, or doubly link the list through the
694 if (tt == saved_tt) {
695 struct radix_node *xx = x;
696 /* link in at head of list */
697 (tt = treenodes)->rn_dupedkey = t;
698 tt->rn_flags = t->rn_flags;
699 tt->rn_parent = x = t->rn_parent;
700 t->rn_parent = tt; /* parent */
705 saved_tt = tt; x = xx;
707 (tt = treenodes)->rn_dupedkey = t->rn_dupedkey;
709 tt->rn_parent = t; /* parent */
710 if (tt->rn_dupedkey) /* parent */
711 tt->rn_dupedkey->rn_parent = tt; /* parent */
714 t=tt+1; tt->rn_info = rn_nodenum++; t->rn_info = rn_nodenum++;
715 tt->rn_twin = t; tt->rn_ybro = rn_clist; rn_clist = tt;
717 tt->rn_key = (caddr_t) v;
719 tt->rn_flags = RNF_ACTIVE;
725 tt->rn_mask = netmask;
726 tt->rn_bit = x->rn_bit;
727 tt->rn_flags |= x->rn_flags & RNF_NORMAL;
729 t = saved_tt->rn_parent;
732 b_leaf = -1 - t->rn_bit;
733 if (t->rn_right == saved_tt)
737 /* Promote general routes from below */
739 for (mp = &t->rn_mklist; x; x = x->rn_dupedkey)
740 if (x->rn_mask && (x->rn_bit >= b_leaf) && x->rn_mklist == 0) {
741 *mp = m = rn_new_radix_mask(x, 0);
745 } else if (x->rn_mklist) {
747 * Skip over masks whose index is > that of new node
749 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist)
750 if (m->rm_bit >= b_leaf)
752 t->rn_mklist = m; *mp = 0;
755 /* Add new route to highest possible ancestor's list */
756 if ((netmask == 0) || (b > t->rn_bit ))
757 return tt; /* can't lift at all */
762 } while (b <= t->rn_bit && x != top);
764 * Search through routes associated with node to
765 * insert new route according to index.
766 * Need same criteria as when sorting dupedkeys to avoid
767 * double loop on deletion.
769 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist) {
770 if (m->rm_bit < b_leaf)
772 if (m->rm_bit > b_leaf)
774 if (m->rm_flags & RNF_NORMAL) {
775 mmask = m->rm_leaf->rn_mask;
776 if (tt->rn_flags & RNF_NORMAL) {
777 #if !defined(RADIX_MPATH)
779 "Non-unique normal route, mask not entered\n");
785 if (mmask == netmask) {
790 if (rn_refines(netmask, mmask)
791 || rn_lexobetter(netmask, mmask))
794 *mp = rn_new_radix_mask(tt, *mp);
799 rn_delete(v_arg, netmask_arg, head)
800 void *v_arg, *netmask_arg;
801 struct radix_node_head *head;
803 register struct radix_node *t, *p, *x, *tt;
804 struct radix_mask *m, *saved_m, **mp;
805 struct radix_node *dupedkey, *saved_tt, *top;
807 int b, head_off, vlen;
810 netmask = netmask_arg;
811 x = head->rnh_treetop;
812 tt = rn_search(v, x);
813 head_off = x->rn_offset;
818 bcmp(v + head_off, tt->rn_key + head_off, vlen - head_off))
821 * Delete our route from mask lists.
824 x = rn_addmask_r(netmask, head->rnh_masks, 1, head_off);
828 while (tt->rn_mask != netmask)
829 if ((tt = tt->rn_dupedkey) == 0)
832 if (tt->rn_mask == 0 || (saved_m = m = tt->rn_mklist) == 0)
834 if (tt->rn_flags & RNF_NORMAL) {
835 if (m->rm_leaf != tt || m->rm_refs > 0) {
836 log(LOG_ERR, "rn_delete: inconsistent annotation\n");
837 return 0; /* dangling ref could cause disaster */
840 if (m->rm_mask != tt->rn_mask) {
841 log(LOG_ERR, "rn_delete: inconsistent annotation\n");
844 if (--m->rm_refs >= 0)
848 t = saved_tt->rn_parent;
850 goto on1; /* Wasn't lifted at all */
854 } while (b <= t->rn_bit && x != top);
855 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist)
862 log(LOG_ERR, "rn_delete: couldn't find our annotation\n");
863 if (tt->rn_flags & RNF_NORMAL)
864 return (0); /* Dangling ref to us */
868 * Eliminate us from tree
870 if (tt->rn_flags & RNF_ROOT)
873 /* Get us out of the creation list */
874 for (t = rn_clist; t && t->rn_ybro != tt; t = t->rn_ybro) {}
875 if (t) t->rn_ybro = tt->rn_ybro;
878 dupedkey = saved_tt->rn_dupedkey;
881 * Here, tt is the deletion target and
882 * saved_tt is the head of the dupekey chain.
884 if (tt == saved_tt) {
885 /* remove from head of chain */
886 x = dupedkey; x->rn_parent = t;
887 if (t->rn_left == tt)
892 /* find node in front of tt on the chain */
893 for (x = p = saved_tt; p && p->rn_dupedkey != tt;)
896 p->rn_dupedkey = tt->rn_dupedkey;
897 if (tt->rn_dupedkey) /* parent */
898 tt->rn_dupedkey->rn_parent = p;
900 } else log(LOG_ERR, "rn_delete: couldn't find us\n");
903 if (t->rn_flags & RNF_ACTIVE) {
917 x->rn_left->rn_parent = x;
918 x->rn_right->rn_parent = x;
922 if (t->rn_left == tt)
927 if (p->rn_right == t)
933 * Demote routes attached to us.
936 if (x->rn_bit >= 0) {
937 for (mp = &x->rn_mklist; (m = *mp);)
941 /* If there are any key,mask pairs in a sibling
942 duped-key chain, some subset will appear sorted
943 in the same order attached to our mklist */
944 for (m = t->rn_mklist; m && x; x = x->rn_dupedkey)
945 if (m == x->rn_mklist) {
946 struct radix_mask *mm = m->rm_mklist;
948 if (--(m->rm_refs) < 0)
954 "rn_delete: Orphaned Mask %p at %p\n",
959 * We may be holding an active internal node in the tree.
970 t->rn_left->rn_parent = t;
971 t->rn_right->rn_parent = t;
979 tt->rn_flags &= ~RNF_ACTIVE;
980 tt[1].rn_flags &= ~RNF_ACTIVE;
985 * This is the same as rn_walktree() except for the parameters and the
989 rn_walktree_from(h, a, m, f, w)
990 struct radix_node_head *h;
996 struct radix_node *base, *next;
997 u_char *xa = (u_char *)a;
998 u_char *xm = (u_char *)m;
999 register struct radix_node *rn, *last = 0 /* shut up gcc */;
1004 * rn_search_m is sort-of-open-coded here. We cannot use the
1005 * function because we need to keep track of the last node seen.
1007 /* printf("about to search\n"); */
1008 for (rn = h->rnh_treetop; rn->rn_bit >= 0; ) {
1010 /* printf("rn_bit %d, rn_bmask %x, xm[rn_offset] %x\n",
1011 rn->rn_bit, rn->rn_bmask, xm[rn->rn_offset]); */
1012 if (!(rn->rn_bmask & xm[rn->rn_offset])) {
1015 if (rn->rn_bmask & xa[rn->rn_offset]) {
1021 /* printf("done searching\n"); */
1024 * Two cases: either we stepped off the end of our mask,
1025 * in which case last == rn, or we reached a leaf, in which
1026 * case we want to start from the last node we looked at.
1027 * Either way, last is the node we want to start from.
1032 /* printf("rn %p, lastb %d\n", rn, lastb);*/
1035 * This gets complicated because we may delete the node
1036 * while applying the function f to it, so we need to calculate
1037 * the successor node in advance.
1039 while (rn->rn_bit >= 0)
1043 /* printf("node %p (%d)\n", rn, rn->rn_bit); */
1045 /* If at right child go back up, otherwise, go right */
1046 while (rn->rn_parent->rn_right == rn
1047 && !(rn->rn_flags & RNF_ROOT)) {
1050 /* if went up beyond last, stop */
1051 if (rn->rn_bit <= lastb) {
1053 /* printf("up too far\n"); */
1055 * XXX we should jump to the 'Process leaves'
1056 * part, because the values of 'rn' and 'next'
1057 * we compute will not be used. Not a big deal
1058 * because this loop will terminate, but it is
1059 * inefficient and hard to understand!
1065 * At the top of the tree, no need to traverse the right
1066 * half, prevent the traversal of the entire tree in the
1067 * case of default route.
1069 if (rn->rn_parent->rn_flags & RNF_ROOT)
1072 /* Find the next *leaf* since next node might vanish, too */
1073 for (rn = rn->rn_parent->rn_right; rn->rn_bit >= 0;)
1076 /* Process leaves */
1077 while ((rn = base) != 0) {
1078 base = rn->rn_dupedkey;
1079 /* printf("leaf %p\n", rn); */
1080 if (!(rn->rn_flags & RNF_ROOT)
1081 && (error = (*f)(rn, w)))
1086 if (rn->rn_flags & RNF_ROOT) {
1087 /* printf("root, stopping"); */
1096 rn_walktree(h, f, w)
1097 struct radix_node_head *h;
1102 struct radix_node *base, *next;
1103 register struct radix_node *rn = h->rnh_treetop;
1105 * This gets complicated because we may delete the node
1106 * while applying the function f to it, so we need to calculate
1107 * the successor node in advance.
1110 /* First time through node, go left */
1111 while (rn->rn_bit >= 0)
1115 /* If at right child go back up, otherwise, go right */
1116 while (rn->rn_parent->rn_right == rn
1117 && (rn->rn_flags & RNF_ROOT) == 0)
1119 /* Find the next *leaf* since next node might vanish, too */
1120 for (rn = rn->rn_parent->rn_right; rn->rn_bit >= 0;)
1123 /* Process leaves */
1124 while ((rn = base)) {
1125 base = rn->rn_dupedkey;
1126 if (!(rn->rn_flags & RNF_ROOT)
1127 && (error = (*f)(rn, w)))
1131 if (rn->rn_flags & RNF_ROOT)
1138 * Allocate and initialize an empty tree. This has 3 nodes, which are
1139 * part of the radix_node_head (in the order <left,root,right>) and are
1140 * marked RNF_ROOT so they cannot be freed.
1141 * The leaves have all-zero and all-one keys, with significant
1142 * bits starting at 'off'.
1143 * Return 1 on success, 0 on error.
1146 rn_inithead_internal(void **head, int off)
1148 register struct radix_node_head *rnh;
1149 register struct radix_node *t, *tt, *ttt;
1152 R_Zalloc(rnh, struct radix_node_head *, sizeof (*rnh));
1156 RADIX_NODE_HEAD_LOCK_INIT(rnh);
1159 t = rn_newpair(rn_zeros, off, rnh->rnh_nodes);
1160 ttt = rnh->rnh_nodes + 2;
1163 tt = t->rn_left; /* ... which in turn is rnh->rnh_nodes */
1164 tt->rn_flags = t->rn_flags = RNF_ROOT | RNF_ACTIVE;
1165 tt->rn_bit = -1 - off;
1167 ttt->rn_key = rn_ones;
1168 rnh->rnh_addaddr = rn_addroute;
1169 rnh->rnh_deladdr = rn_delete;
1170 rnh->rnh_matchaddr = rn_match;
1171 rnh->rnh_lookup = rn_lookup;
1172 rnh->rnh_walktree = rn_walktree;
1173 rnh->rnh_walktree_from = rn_walktree_from;
1174 rnh->rnh_treetop = t;
1179 rn_detachhead_internal(void **head)
1181 struct radix_node_head *rnh;
1183 KASSERT((head != NULL && *head != NULL),
1184 ("%s: head already freed", __func__));
1187 /* Free <left,root,right> nodes. */
1194 rn_inithead(void **head, int off)
1196 struct radix_node_head *rnh;
1201 if (rn_inithead_internal(head, off) == 0)
1204 rnh = (struct radix_node_head *)(*head);
1206 if (rn_inithead_internal((void **)&rnh->rnh_masks, 0) == 0) {
1207 rn_detachhead_internal(head);
1215 rn_detachhead(void **head)
1217 struct radix_node_head *rnh;
1219 KASSERT((head != NULL && *head != NULL),
1220 ("%s: head already freed", __func__));
1224 rn_detachhead_internal((void **)&rnh->rnh_masks);
1225 rn_detachhead_internal(head);
1232 if ((maxk <= 0) || (maxk > RADIX_MAX_KEY_LEN)) {
1234 "rn_init: max_keylen must be within 1..%d\n",
1240 * XXX: Compat for old rn_addmask() users
1242 if (rn_inithead((void **)(void *)&mask_rnhead_compat, 0) == 0)
1245 mtx_init(&mask_mtx, "radix_mask", NULL, MTX_DEF);