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31 * @(#)radix.c 8.5 (Berkeley) 5/19/95
36 * Routines to build and maintain radix trees for routing lookups.
38 #include <sys/param.h>
41 #include <sys/mutex.h>
42 #include <sys/rmlock.h>
43 #include <sys/systm.h>
44 #include <sys/malloc.h>
45 #include <sys/syslog.h>
46 #include <net/radix.h>
47 #include "opt_mpath.h"
49 #include <net/radix_mpath.h>
55 #define log(x, arg...) fprintf(stderr, ## arg)
56 #define panic(x) fprintf(stderr, "PANIC: %s", x), exit(1)
57 #define min(a, b) ((a) < (b) ? (a) : (b) )
58 #include <net/radix.h>
61 static struct radix_node
62 *rn_insert(void *, struct radix_head *, int *,
63 struct radix_node [2]),
64 *rn_newpair(void *, int, struct radix_node[2]),
65 *rn_search(void *, struct radix_node *),
66 *rn_search_m(void *, struct radix_node *, void *);
67 static struct radix_node *rn_addmask(void *, struct radix_mask_head *, int,int);
69 static void rn_detachhead_internal(struct radix_head *);
71 #define RADIX_MAX_KEY_LEN 32
73 static char rn_zeros[RADIX_MAX_KEY_LEN];
74 static char rn_ones[RADIX_MAX_KEY_LEN] = {
75 -1, -1, -1, -1, -1, -1, -1, -1,
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,
81 static int rn_lexobetter(void *m_arg, void *n_arg);
82 static struct radix_mask *
83 rn_new_radix_mask(struct radix_node *tt,
84 struct radix_mask *next);
85 static int rn_satisfies_leaf(char *trial, struct radix_node *leaf,
89 * The data structure for the keys is a radix tree with one way
90 * branching removed. The index rn_bit at an internal node n represents a bit
91 * position to be tested. The tree is arranged so that all descendants
92 * of a node n have keys whose bits all agree up to position rn_bit - 1.
93 * (We say the index of n is rn_bit.)
95 * There is at least one descendant which has a one bit at position rn_bit,
96 * and at least one with a zero there.
98 * A route is determined by a pair of key and mask. We require that the
99 * bit-wise logical and of the key and mask to be the key.
100 * We define the index of a route to associated with the mask to be
101 * the first bit number in the mask where 0 occurs (with bit number 0
102 * representing the highest order bit).
104 * We say a mask is normal if every bit is 0, past the index of the mask.
105 * If a node n has a descendant (k, m) with index(m) == index(n) == rn_bit,
106 * and m is a normal mask, then the route applies to every descendant of n.
107 * If the index(m) < rn_bit, this implies the trailing last few bits of k
108 * before bit b are all 0, (and hence consequently true of every descendant
109 * of n), so the route applies to all descendants of the node as well.
111 * Similar logic shows that a non-normal mask m such that
112 * index(m) <= index(n) could potentially apply to many children of n.
113 * Thus, for each non-host route, we attach its mask to a list at an internal
114 * node as high in the tree as we can go.
116 * The present version of the code makes use of normal routes in short-
117 * circuiting an explict mask and compare operation when testing whether
118 * a key satisfies a normal route, and also in remembering the unique leaf
119 * that governs a subtree.
123 * Most of the functions in this code assume that the key/mask arguments
124 * are sockaddr-like structures, where the first byte is an u_char
125 * indicating the size of the entire structure.
127 * To make the assumption more explicit, we use the LEN() macro to access
128 * this field. It is safe to pass an expression with side effects
129 * to LEN() as the argument is evaluated only once.
130 * We cast the result to int as this is the dominant usage.
132 #define LEN(x) ( (int) (*(const u_char *)(x)) )
135 * XXX THIS NEEDS TO BE FIXED
136 * In the code, pointers to keys and masks are passed as either
137 * 'void *' (because callers use to pass pointers of various kinds), or
138 * 'caddr_t' (which is fine for pointer arithmetics, but not very
139 * clean when you dereference it to access data). Furthermore, caddr_t
140 * is really 'char *', while the natural type to operate on keys and
141 * masks would be 'u_char'. This mismatch require a lot of casts and
142 * intermediate variables to adapt types that clutter the code.
146 * Search a node in the tree matching the key.
148 static struct radix_node *
149 rn_search(void *v_arg, struct radix_node *head)
151 struct radix_node *x;
154 for (x = head, v = v_arg; x->rn_bit >= 0;) {
155 if (x->rn_bmask & v[x->rn_offset])
164 * Same as above, but with an additional mask.
165 * XXX note this function is used only once.
167 static struct radix_node *
168 rn_search_m(void *v_arg, struct radix_node *head, void *m_arg)
170 struct radix_node *x;
171 caddr_t v = v_arg, m = m_arg;
173 for (x = head; x->rn_bit >= 0;) {
174 if ((x->rn_bmask & m[x->rn_offset]) &&
175 (x->rn_bmask & v[x->rn_offset]))
184 rn_refines(void *m_arg, void *n_arg)
186 caddr_t m = m_arg, n = n_arg;
187 caddr_t lim, lim2 = lim = n + LEN(n);
188 int longer = LEN(n++) - LEN(m++);
189 int masks_are_equal = 1;
202 if (masks_are_equal && (longer < 0))
203 for (lim2 = m - longer; m < lim2; )
206 return (!masks_are_equal);
210 * Search for exact match in given @head.
211 * Assume host bits are cleared in @v_arg if @m_arg is not NULL
212 * Note that prefixes with /32 or /128 masks are treated differently
216 rn_lookup(void *v_arg, void *m_arg, struct radix_head *head)
218 struct radix_node *x;
223 * Most common case: search exact prefix/mask
225 x = rn_addmask(m_arg, head->rnh_masks, 1,
226 head->rnh_treetop->rn_offset);
231 x = rn_match(v_arg, head);
233 while (x != NULL && x->rn_mask != netmask)
240 * Search for host address.
242 if ((x = rn_match(v_arg, head)) == NULL)
245 /* Check if found key is the same */
246 if (LEN(x->rn_key) != LEN(v_arg) || bcmp(x->rn_key, v_arg, LEN(v_arg)))
249 /* Check if this is not host route */
250 if (x->rn_mask != NULL)
257 rn_satisfies_leaf(char *trial, struct radix_node *leaf, int skip)
259 char *cp = trial, *cp2 = leaf->rn_key, *cp3 = leaf->rn_mask;
261 int length = min(LEN(cp), LEN(cp2));
266 length = min(length, LEN(cp3));
267 cplim = cp + length; cp3 += skip; cp2 += skip;
268 for (cp += skip; cp < cplim; cp++, cp2++, cp3++)
269 if ((*cp ^ *cp2) & *cp3)
275 * Search for longest-prefix match in given @head
278 rn_match(void *v_arg, struct radix_head *head)
281 struct radix_node *t = head->rnh_treetop, *x;
284 struct radix_node *saved_t, *top = t;
285 int off = t->rn_offset, vlen = LEN(cp), matched_off;
289 * Open code rn_search(v, top) to avoid overhead of extra
292 for (; t->rn_bit >= 0; ) {
293 if (t->rn_bmask & cp[t->rn_offset])
299 * See if we match exactly as a host destination
300 * or at least learn how many bits match, for normal mask finesse.
302 * It doesn't hurt us to limit how many bytes to check
303 * to the length of the mask, since if it matches we had a genuine
304 * match and the leaf we have is the most specific one anyway;
305 * if it didn't match with a shorter length it would fail
306 * with a long one. This wins big for class B&C netmasks which
307 * are probably the most common case...
310 vlen = *(u_char *)t->rn_mask;
311 cp += off; cp2 = t->rn_key + off; cplim = v + vlen;
312 for (; cp < cplim; cp++, cp2++)
316 * This extra grot is in case we are explicitly asked
317 * to look up the default. Ugh!
319 * Never return the root node itself, it seems to cause a
322 if (t->rn_flags & RNF_ROOT)
326 test = (*cp ^ *cp2) & 0xff; /* find first bit that differs */
327 for (b = 7; (test >>= 1) > 0;)
329 matched_off = cp - v;
330 b += matched_off << 3;
333 * If there is a host route in a duped-key chain, it will be first.
335 if ((saved_t = t)->rn_mask == 0)
337 for (; t; t = t->rn_dupedkey)
339 * Even if we don't match exactly as a host,
340 * we may match if the leaf we wound up at is
343 if (t->rn_flags & RNF_NORMAL) {
344 if (rn_bit <= t->rn_bit)
346 } else if (rn_satisfies_leaf(v, t, matched_off))
349 /* start searching up the tree */
351 struct radix_mask *m;
355 * If non-contiguous masks ever become important
356 * we can restore the masking and open coding of
357 * the search and satisfaction test and put the
358 * calculation of "off" back before the "do".
361 if (m->rm_flags & RNF_NORMAL) {
362 if (rn_bit <= m->rm_bit)
365 off = min(t->rn_offset, matched_off);
366 x = rn_search_m(v, t, m->rm_mask);
367 while (x && x->rn_mask != m->rm_mask)
369 if (x && rn_satisfies_leaf(v, x, off))
380 struct radix_node *rn_clist;
386 * Whenever we add a new leaf to the tree, we also add a parent node,
387 * so we allocate them as an array of two elements: the first one must be
388 * the leaf (see RNTORT() in route.c), the second one is the parent.
389 * This routine initializes the relevant fields of the nodes, so that
390 * the leaf is the left child of the parent node, and both nodes have
391 * (almost) all all fields filled as appropriate.
392 * (XXX some fields are left unset, see the '#if 0' section).
393 * The function returns a pointer to the parent node.
396 static struct radix_node *
397 rn_newpair(void *v, int b, struct radix_node nodes[2])
399 struct radix_node *tt = nodes, *t = tt + 1;
401 t->rn_bmask = 0x80 >> (b & 7);
403 t->rn_offset = b >> 3;
405 #if 0 /* XXX perhaps we should fill these fields as well. */
406 t->rn_parent = t->rn_right = NULL;
409 tt->rn_dupedkey = NULL;
413 tt->rn_key = (caddr_t)v;
415 tt->rn_flags = t->rn_flags = RNF_ACTIVE;
416 tt->rn_mklist = t->rn_mklist = 0;
418 tt->rn_info = rn_nodenum++; t->rn_info = rn_nodenum++;
420 tt->rn_ybro = rn_clist;
426 static struct radix_node *
427 rn_insert(void *v_arg, struct radix_head *head, int *dupentry,
428 struct radix_node nodes[2])
431 struct radix_node *top = head->rnh_treetop;
432 int head_off = top->rn_offset, vlen = LEN(v);
433 struct radix_node *t = rn_search(v_arg, top);
434 caddr_t cp = v + head_off;
436 struct radix_node *p, *tt, *x;
438 * Find first bit at which v and t->rn_key differ
440 caddr_t cp2 = t->rn_key + head_off;
442 caddr_t cplim = v + vlen;
451 cmp_res = (cp[-1] ^ cp2[-1]) & 0xff;
452 for (b = (cp - v) << 3; cmp_res; b--)
459 if (cp[x->rn_offset] & x->rn_bmask)
463 } while (b > (unsigned) x->rn_bit);
464 /* x->rn_bit < b && x->rn_bit >= 0 */
467 log(LOG_DEBUG, "rn_insert: Going In:\n"), traverse(p);
469 t = rn_newpair(v_arg, b, nodes);
471 if ((cp[p->rn_offset] & p->rn_bmask) == 0)
476 t->rn_parent = p; /* frees x, p as temp vars below */
477 if ((cp[t->rn_offset] & t->rn_bmask) == 0) {
485 log(LOG_DEBUG, "rn_insert: Coming Out:\n"), traverse(p);
491 rn_addmask(void *n_arg, struct radix_mask_head *maskhead, int search, int skip)
493 unsigned char *netmask = n_arg;
494 unsigned char *cp, *cplim;
495 struct radix_node *x;
497 int maskduplicated, isnormal;
498 struct radix_node *saved_x;
499 unsigned char addmask_key[RADIX_MAX_KEY_LEN];
501 if ((mlen = LEN(netmask)) > RADIX_MAX_KEY_LEN)
502 mlen = RADIX_MAX_KEY_LEN;
506 return (maskhead->mask_nodes);
508 bzero(addmask_key, RADIX_MAX_KEY_LEN);
510 bcopy(rn_ones + 1, addmask_key + 1, skip - 1);
511 bcopy(netmask + skip, addmask_key + skip, mlen - skip);
513 * Trim trailing zeroes.
515 for (cp = addmask_key + mlen; (cp > addmask_key) && cp[-1] == 0;)
517 mlen = cp - addmask_key;
519 return (maskhead->mask_nodes);
521 x = rn_search(addmask_key, maskhead->head.rnh_treetop);
522 if (bcmp(addmask_key, x->rn_key, mlen) != 0)
526 R_Zalloc(x, struct radix_node *, RADIX_MAX_KEY_LEN + 2 * sizeof (*x));
527 if ((saved_x = x) == NULL)
529 netmask = cp = (unsigned char *)(x + 2);
530 bcopy(addmask_key, cp, mlen);
531 x = rn_insert(cp, &maskhead->head, &maskduplicated, x);
532 if (maskduplicated) {
533 log(LOG_ERR, "rn_addmask: mask impossibly already in tree");
538 * Calculate index of mask, and check for normalcy.
539 * First find the first byte with a 0 bit, then if there are
540 * more bits left (remember we already trimmed the trailing 0's),
541 * the bits should be contiguous, otherwise we have got
542 * a non-contiguous mask.
544 #define CONTIG(_c) (((~(_c) + 1) & (_c)) == (unsigned char)(~(_c) + 1))
545 cplim = netmask + mlen;
547 for (cp = netmask + skip; (cp < cplim) && *(u_char *)cp == 0xff;)
550 for (j = 0x80; (j & *cp) != 0; j >>= 1)
552 if (!CONTIG(*cp) || cp != (cplim - 1))
555 b += (cp - netmask) << 3;
558 x->rn_flags |= RNF_NORMAL;
562 static int /* XXX: arbitrary ordering for non-contiguous masks */
563 rn_lexobetter(void *m_arg, void *n_arg)
565 u_char *mp = m_arg, *np = n_arg, *lim;
567 if (LEN(mp) > LEN(np))
568 return (1); /* not really, but need to check longer one first */
569 if (LEN(mp) == LEN(np))
570 for (lim = mp + LEN(mp); mp < lim;)
576 static struct radix_mask *
577 rn_new_radix_mask(struct radix_node *tt, struct radix_mask *next)
579 struct radix_mask *m;
581 R_Malloc(m, struct radix_mask *, sizeof (struct radix_mask));
583 log(LOG_ERR, "Failed to allocate route mask\n");
586 bzero(m, sizeof(*m));
587 m->rm_bit = tt->rn_bit;
588 m->rm_flags = tt->rn_flags;
589 if (tt->rn_flags & RNF_NORMAL)
592 m->rm_mask = tt->rn_mask;
599 rn_addroute(void *v_arg, void *n_arg, struct radix_head *head,
600 struct radix_node treenodes[2])
602 caddr_t v = (caddr_t)v_arg, netmask = (caddr_t)n_arg;
603 struct radix_node *t, *x = NULL, *tt;
604 struct radix_node *saved_tt, *top = head->rnh_treetop;
605 short b = 0, b_leaf = 0;
608 struct radix_mask *m, **mp;
611 * In dealing with non-contiguous masks, there may be
612 * many different routes which have the same mask.
613 * We will find it useful to have a unique pointer to
614 * the mask to speed avoiding duplicate references at
615 * nodes and possibly save time in calculating indices.
618 x = rn_addmask(netmask, head->rnh_masks, 0, top->rn_offset);
626 * Deal with duplicated keys: attach node to previous instance
628 saved_tt = tt = rn_insert(v, head, &keyduplicated, treenodes);
630 for (t = tt; tt; t = tt, tt = tt->rn_dupedkey) {
632 /* permit multipath, if enabled for the family */
633 if (rn_mpath_capable(head) && netmask == tt->rn_mask) {
635 * go down to the end of multipaths, so that
636 * new entry goes into the end of rn_dupedkey
641 tt = tt->rn_dupedkey;
642 } while (tt && t->rn_mask == tt->rn_mask);
646 if (tt->rn_mask == netmask)
650 ((b_leaf < tt->rn_bit) /* index(netmask) > node */
651 || rn_refines(netmask, tt->rn_mask)
652 || rn_lexobetter(netmask, tt->rn_mask))))
656 * If the mask is not duplicated, we wouldn't
657 * find it among possible duplicate key entries
658 * anyway, so the above test doesn't hurt.
660 * We sort the masks for a duplicated key the same way as
661 * in a masklist -- most specific to least specific.
662 * This may require the unfortunate nuisance of relocating
663 * the head of the list.
665 * We also reverse, or doubly link the list through the
668 if (tt == saved_tt) {
669 struct radix_node *xx = x;
670 /* link in at head of list */
671 (tt = treenodes)->rn_dupedkey = t;
672 tt->rn_flags = t->rn_flags;
673 tt->rn_parent = x = t->rn_parent;
674 t->rn_parent = tt; /* parent */
679 saved_tt = tt; x = xx;
681 (tt = treenodes)->rn_dupedkey = t->rn_dupedkey;
683 tt->rn_parent = t; /* parent */
684 if (tt->rn_dupedkey) /* parent */
685 tt->rn_dupedkey->rn_parent = tt; /* parent */
688 t=tt+1; tt->rn_info = rn_nodenum++; t->rn_info = rn_nodenum++;
689 tt->rn_twin = t; tt->rn_ybro = rn_clist; rn_clist = tt;
691 tt->rn_key = (caddr_t) v;
693 tt->rn_flags = RNF_ACTIVE;
699 tt->rn_mask = netmask;
700 tt->rn_bit = x->rn_bit;
701 tt->rn_flags |= x->rn_flags & RNF_NORMAL;
703 t = saved_tt->rn_parent;
706 b_leaf = -1 - t->rn_bit;
707 if (t->rn_right == saved_tt)
711 /* Promote general routes from below */
713 for (mp = &t->rn_mklist; x; x = x->rn_dupedkey)
714 if (x->rn_mask && (x->rn_bit >= b_leaf) && x->rn_mklist == 0) {
715 *mp = m = rn_new_radix_mask(x, 0);
719 } else if (x->rn_mklist) {
721 * Skip over masks whose index is > that of new node
723 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist)
724 if (m->rm_bit >= b_leaf)
726 t->rn_mklist = m; *mp = NULL;
729 /* Add new route to highest possible ancestor's list */
730 if ((netmask == 0) || (b > t->rn_bit ))
731 return (tt); /* can't lift at all */
736 } while (b <= t->rn_bit && x != top);
738 * Search through routes associated with node to
739 * insert new route according to index.
740 * Need same criteria as when sorting dupedkeys to avoid
741 * double loop on deletion.
743 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist) {
744 if (m->rm_bit < b_leaf)
746 if (m->rm_bit > b_leaf)
748 if (m->rm_flags & RNF_NORMAL) {
749 mmask = m->rm_leaf->rn_mask;
750 if (tt->rn_flags & RNF_NORMAL) {
751 #if !defined(RADIX_MPATH)
753 "Non-unique normal route, mask not entered\n");
759 if (mmask == netmask) {
764 if (rn_refines(netmask, mmask)
765 || rn_lexobetter(netmask, mmask))
768 *mp = rn_new_radix_mask(tt, *mp);
773 rn_delete(void *v_arg, void *netmask_arg, struct radix_head *head)
775 struct radix_node *t, *p, *x, *tt;
776 struct radix_mask *m, *saved_m, **mp;
777 struct radix_node *dupedkey, *saved_tt, *top;
779 int b, head_off, vlen;
782 netmask = netmask_arg;
783 x = head->rnh_treetop;
784 tt = rn_search(v, x);
785 head_off = x->rn_offset;
790 bcmp(v + head_off, tt->rn_key + head_off, vlen - head_off))
793 * Delete our route from mask lists.
796 x = rn_addmask(netmask, head->rnh_masks, 1, head_off);
800 while (tt->rn_mask != netmask)
801 if ((tt = tt->rn_dupedkey) == NULL)
804 if (tt->rn_mask == 0 || (saved_m = m = tt->rn_mklist) == NULL)
806 if (tt->rn_flags & RNF_NORMAL) {
807 if (m->rm_leaf != tt || m->rm_refs > 0) {
808 log(LOG_ERR, "rn_delete: inconsistent annotation\n");
809 return (0); /* dangling ref could cause disaster */
812 if (m->rm_mask != tt->rn_mask) {
813 log(LOG_ERR, "rn_delete: inconsistent annotation\n");
816 if (--m->rm_refs >= 0)
820 t = saved_tt->rn_parent;
822 goto on1; /* Wasn't lifted at all */
826 } while (b <= t->rn_bit && x != top);
827 for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist)
834 log(LOG_ERR, "rn_delete: couldn't find our annotation\n");
835 if (tt->rn_flags & RNF_NORMAL)
836 return (0); /* Dangling ref to us */
840 * Eliminate us from tree
842 if (tt->rn_flags & RNF_ROOT)
845 /* Get us out of the creation list */
846 for (t = rn_clist; t && t->rn_ybro != tt; t = t->rn_ybro) {}
847 if (t) t->rn_ybro = tt->rn_ybro;
850 dupedkey = saved_tt->rn_dupedkey;
853 * Here, tt is the deletion target and
854 * saved_tt is the head of the dupekey chain.
856 if (tt == saved_tt) {
857 /* remove from head of chain */
858 x = dupedkey; x->rn_parent = t;
859 if (t->rn_left == tt)
864 /* find node in front of tt on the chain */
865 for (x = p = saved_tt; p && p->rn_dupedkey != tt;)
868 p->rn_dupedkey = tt->rn_dupedkey;
869 if (tt->rn_dupedkey) /* parent */
870 tt->rn_dupedkey->rn_parent = p;
872 } else log(LOG_ERR, "rn_delete: couldn't find us\n");
875 if (t->rn_flags & RNF_ACTIVE) {
889 x->rn_left->rn_parent = x;
890 x->rn_right->rn_parent = x;
894 if (t->rn_left == tt)
899 if (p->rn_right == t)
905 * Demote routes attached to us.
908 if (x->rn_bit >= 0) {
909 for (mp = &x->rn_mklist; (m = *mp);)
913 /* If there are any key,mask pairs in a sibling
914 duped-key chain, some subset will appear sorted
915 in the same order attached to our mklist */
916 for (m = t->rn_mklist; m && x; x = x->rn_dupedkey)
917 if (m == x->rn_mklist) {
918 struct radix_mask *mm = m->rm_mklist;
920 if (--(m->rm_refs) < 0)
926 "rn_delete: Orphaned Mask %p at %p\n",
931 * We may be holding an active internal node in the tree.
942 t->rn_left->rn_parent = t;
943 t->rn_right->rn_parent = t;
951 tt->rn_flags &= ~RNF_ACTIVE;
952 tt[1].rn_flags &= ~RNF_ACTIVE;
957 * This is the same as rn_walktree() except for the parameters and the
961 rn_walktree_from(struct radix_head *h, void *a, void *m,
962 walktree_f_t *f, void *w)
965 struct radix_node *base, *next;
966 u_char *xa = (u_char *)a;
967 u_char *xm = (u_char *)m;
968 struct radix_node *rn, *last = NULL; /* shut up gcc */
972 KASSERT(m != NULL, ("%s: mask needs to be specified", __func__));
975 * rn_search_m is sort-of-open-coded here. We cannot use the
976 * function because we need to keep track of the last node seen.
978 /* printf("about to search\n"); */
979 for (rn = h->rnh_treetop; rn->rn_bit >= 0; ) {
981 /* printf("rn_bit %d, rn_bmask %x, xm[rn_offset] %x\n",
982 rn->rn_bit, rn->rn_bmask, xm[rn->rn_offset]); */
983 if (!(rn->rn_bmask & xm[rn->rn_offset])) {
986 if (rn->rn_bmask & xa[rn->rn_offset]) {
992 /* printf("done searching\n"); */
995 * Two cases: either we stepped off the end of our mask,
996 * in which case last == rn, or we reached a leaf, in which
997 * case we want to start from the leaf.
1001 lastb = last->rn_bit;
1003 /* printf("rn %p, lastb %d\n", rn, lastb);*/
1006 * This gets complicated because we may delete the node
1007 * while applying the function f to it, so we need to calculate
1008 * the successor node in advance.
1010 while (rn->rn_bit >= 0)
1014 /* printf("node %p (%d)\n", rn, rn->rn_bit); */
1016 /* If at right child go back up, otherwise, go right */
1017 while (rn->rn_parent->rn_right == rn
1018 && !(rn->rn_flags & RNF_ROOT)) {
1021 /* if went up beyond last, stop */
1022 if (rn->rn_bit <= lastb) {
1024 /* printf("up too far\n"); */
1026 * XXX we should jump to the 'Process leaves'
1027 * part, because the values of 'rn' and 'next'
1028 * we compute will not be used. Not a big deal
1029 * because this loop will terminate, but it is
1030 * inefficient and hard to understand!
1036 * At the top of the tree, no need to traverse the right
1037 * half, prevent the traversal of the entire tree in the
1038 * case of default route.
1040 if (rn->rn_parent->rn_flags & RNF_ROOT)
1043 /* Find the next *leaf* since next node might vanish, too */
1044 for (rn = rn->rn_parent->rn_right; rn->rn_bit >= 0;)
1047 /* Process leaves */
1048 while ((rn = base) != NULL) {
1049 base = rn->rn_dupedkey;
1050 /* printf("leaf %p\n", rn); */
1051 if (!(rn->rn_flags & RNF_ROOT)
1052 && (error = (*f)(rn, w)))
1057 if (rn->rn_flags & RNF_ROOT) {
1058 /* printf("root, stopping"); */
1066 rn_walktree(struct radix_head *h, walktree_f_t *f, void *w)
1069 struct radix_node *base, *next;
1070 struct radix_node *rn = h->rnh_treetop;
1072 * This gets complicated because we may delete the node
1073 * while applying the function f to it, so we need to calculate
1074 * the successor node in advance.
1077 /* First time through node, go left */
1078 while (rn->rn_bit >= 0)
1082 /* If at right child go back up, otherwise, go right */
1083 while (rn->rn_parent->rn_right == rn
1084 && (rn->rn_flags & RNF_ROOT) == 0)
1086 /* Find the next *leaf* since next node might vanish, too */
1087 for (rn = rn->rn_parent->rn_right; rn->rn_bit >= 0;)
1090 /* Process leaves */
1091 while ((rn = base)) {
1092 base = rn->rn_dupedkey;
1093 if (!(rn->rn_flags & RNF_ROOT)
1094 && (error = (*f)(rn, w)))
1098 if (rn->rn_flags & RNF_ROOT)
1105 * Initialize an empty tree. This has 3 nodes, which are passed
1106 * via base_nodes (in the order <left,root,right>) and are
1107 * marked RNF_ROOT so they cannot be freed.
1108 * The leaves have all-zero and all-one keys, with significant
1109 * bits starting at 'off'.
1112 rn_inithead_internal(struct radix_head *rh, struct radix_node *base_nodes, int off)
1114 struct radix_node *t, *tt, *ttt;
1116 t = rn_newpair(rn_zeros, off, base_nodes);
1117 ttt = base_nodes + 2;
1120 tt = t->rn_left; /* ... which in turn is base_nodes */
1121 tt->rn_flags = t->rn_flags = RNF_ROOT | RNF_ACTIVE;
1122 tt->rn_bit = -1 - off;
1124 ttt->rn_key = rn_ones;
1126 rh->rnh_treetop = t;
1130 rn_detachhead_internal(struct radix_head *head)
1133 KASSERT((head != NULL),
1134 ("%s: head already freed", __func__));
1136 /* Free <left,root,right> nodes. */
1140 /* Functions used by 'struct radix_node_head' users */
1143 rn_inithead(void **head, int off)
1145 struct radix_node_head *rnh;
1146 struct radix_mask_head *rmh;
1154 R_Zalloc(rnh, struct radix_node_head *, sizeof (*rnh));
1155 R_Zalloc(rmh, struct radix_mask_head *, sizeof (*rmh));
1156 if (rnh == NULL || rmh == NULL) {
1165 rn_inithead_internal(&rnh->rh, rnh->rnh_nodes, off);
1166 rn_inithead_internal(&rmh->head, rmh->mask_nodes, 0);
1168 rnh->rh.rnh_masks = rmh;
1170 /* Finally, set base callbacks */
1171 rnh->rnh_addaddr = rn_addroute;
1172 rnh->rnh_deladdr = rn_delete;
1173 rnh->rnh_matchaddr = rn_match;
1174 rnh->rnh_lookup = rn_lookup;
1175 rnh->rnh_walktree = rn_walktree;
1176 rnh->rnh_walktree_from = rn_walktree_from;
1182 rn_freeentry(struct radix_node *rn, void *arg)
1184 struct radix_head * const rnh = arg;
1185 struct radix_node *x;
1187 x = (struct radix_node *)rn_delete(rn + 2, NULL, rnh);
1194 rn_detachhead(void **head)
1196 struct radix_node_head *rnh;
1198 KASSERT((head != NULL && *head != NULL),
1199 ("%s: head already freed", __func__));
1201 rnh = (struct radix_node_head *)(*head);
1203 rn_walktree(&rnh->rh.rnh_masks->head, rn_freeentry, rnh->rh.rnh_masks);
1204 rn_detachhead_internal(&rnh->rh.rnh_masks->head);
1205 rn_detachhead_internal(&rnh->rh);