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sx_prefix.c
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sx_prefix.c
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#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "sx_prefix.h"
#include "sx_report.h"
int debug_aggregation=0;
extern int debug_expander;
struct sx_prefix*
sx_prefix_alloc(struct sx_prefix* p)
{
struct sx_prefix* sp=malloc(sizeof(struct sx_prefix));
if(!sp) return NULL;
if(p) {
*sp=*p;
} else {
memset(sp,0,sizeof(struct sx_prefix));
};
return sp;
};
void
sx_prefix_destroy(struct sx_prefix* p)
{
if(p) free(p);
};
void
sx_prefix_adjust_masklen(struct sx_prefix* p)
{
int nbytes=(p->family==AF_INET?4:16);
int i;
if(p->masklen==nbytes*8) return ; /* mask is all ones */
for(i=nbytes-1;i>p->masklen/8;i--) {
p->addr.addrs[i]=0;
};
for(i=1;i<=8-p->masklen%8;i++) {
p->addr.addrs[p->masklen/8]&=(0xff<<i);
};
};
void
sx_prefix_mask(struct sx_prefix* p, struct sx_prefix* q)
{
int i;
memset(q->addr.addrs, 0, sizeof(q->addr.addrs));
q->family=p->family;
q->masklen=p->masklen;
for(i=0;i<p->masklen/8;i++)
q->addr.addrs[i]=0xff;
for(i=1;i<=p->masklen%8;i++)
q->addr.addrs[p->masklen/8]|=(1<<(8-i));
};
void
sx_prefix_imask(struct sx_prefix* p, struct sx_prefix* q)
{
int i;
memset(q->addr.addrs, 0xff, sizeof(q->addr.addrs));
q->family=p->family;
q->masklen=p->masklen;
for(i=0;i<p->masklen/8;i++)
q->addr.addrs[i]=0;
for(i=1;i<=p->masklen%8;i++)
q->addr.addrs[p->masklen/8]&=~(1<<(8-i));
};
int
sx_prefix_parse(struct sx_prefix* p, int af, char* text)
{
char* c=NULL;
int masklen, ret;
char mtext[INET6_ADDRSTRLEN+5];
strlcpy(mtext, text, sizeof(mtext));
c=strchr(mtext,'/');
if(c) {
char* eod;
*c=0;
masklen=strtol(c+1,&eod,10);
if(eod && eod[0] && !isspace(eod[0])) {
*c='/';
sx_report(SX_ERROR,"Invalid masklen in prefix %s\n", text);
goto fixups;
};
} else {
masklen=-1;
};
if(!af) {
if(strchr(mtext,':')) af=AF_INET6;
else
af=AF_INET;
};
ret = inet_pton(af, mtext, &p->addr);
if(ret != 1) {
int aparts[4];
/* contrary to documentation (man inet_ntop on FreeBSD),
addresses with leading zeros are not parsed correctly. Try to
workaround this issue manually */
if (af==AF_INET && sscanf(mtext, "%i.%i.%i.%i", aparts,
aparts+1, aparts+2, aparts+3) == 4 && aparts[0]>=0 &&
aparts[0]<256 && aparts[1]>=0 && aparts[1]<256 &&
aparts[2]>=0 && aparts[2]<256 && aparts[3]>=0 &&
aparts[3]<256) {
p->addr.addr.s_addr = htonl((aparts[0]<<24) +
(aparts[1]<<16) + (aparts[2]<<8) + aparts[3]);
} else {
if(c) *c='/';
sx_report(SX_ERROR,"Unable to parse prefix '%s', af=%i (%s), "
"ret=%i\n", mtext, af, af==AF_INET ? "inet" : "inet6", ret);
goto fixups;
};
};
if(af==AF_INET) {
if(masklen==-1) p->masklen=32;
else {
if(masklen<0 || masklen>32) {
p->masklen=32;
} else {
p->masklen=masklen;
};
};
} else if(af==AF_INET6) {
if(masklen==-1) p->masklen=128;
else {
if(masklen<0 || masklen>128) {
p->masklen=128;
} else {
p->masklen=masklen;
};
};
} else {
sx_report(SX_ERROR,"Invalid address family %i\n", af);
goto fixups;
};
p->family=af;
sx_prefix_adjust_masklen(p);
if(c) *c='/';
return 1;
fixups:
return 0;
};
int
sx_prefix_isbitset(struct sx_prefix* p, int n)
{
unsigned char s;
/* bits outside the prefix considered unset */
if(p->family==AF_INET && (n<0 || n>32)) return 0;
else if(p->family==AF_INET6 && (n<0 || n>128)) return 0;
s=p->addr.addrs[(n-1)/8];
return (s&(0x80>>((n-1)%8)))?1:0;
};
void
sx_prefix_setbit(struct sx_prefix* p, int n)
{
unsigned char* s;
if (p->family == AF_INET && (n<0 || n>32)) return;
else if (p->family == AF_INET6 && (n<0 || n>128)) return;
s=p->addr.addrs+(n-1)/8;
(*s)|=0x80>>((n-1)%8);
};
int
sx_radix_tree_insert_specifics(struct sx_radix_tree* t, struct sx_prefix p,
unsigned min, unsigned max)
{
if (p.masklen >= min)
sx_radix_tree_insert(t, &p);
if (p.masklen+1 > max)
return 1;
p.masklen+=1;
sx_radix_tree_insert_specifics(t, p, min, max);
sx_prefix_setbit(&p, p.masklen);
sx_radix_tree_insert_specifics(t, p, min, max);
return 1;
};
int
sx_prefix_range_parse(struct sx_radix_tree* tree, int af, int maxlen,
char* text)
{
char* d=strchr(text, '^');
struct sx_prefix p;
unsigned long min, max;
if (!d || !d[1]) return 0;
*d = 0;
if (!sx_prefix_parse(&p, 0, text)) {
sx_report(SX_ERROR, "Unable to parse prefix %s^%s\n", text, d+1);
return 0;
};
*d = '^';
if (af && p.family != af) {
SX_DEBUG(debug_expander, "Ignoring prefix %s, wrong af %i\n", text,
p.family);
return 0;
};
if (maxlen && p.masklen > maxlen) {
SX_DEBUG(debug_expander, "Ignoring prefix %s, masklen %i > max "
"masklen %u\n", text, p.masklen, maxlen);
return 0;
};
if (d[1] == '-') {
min=p.masklen+1;
max=maxlen;
} else if (d[1] == '+') {
min=p.masklen;
max=maxlen;
} else if (isdigit(d[1])) {
char* dm = NULL;
min = strtoul(d+1, &dm, 10);
if (dm && *dm == '-' && isdigit(dm[1])) {
max = strtoul(dm+1, NULL, 10);
} else if (dm && *dm) {
sx_report(SX_ERROR, "Unable to parse prefix-range %s\n", text);
return 0;
};
} else {
sx_report(SX_ERROR, "Invalid prefix-range %s\n", text);
return 0;
};
if (min < p.masklen) {
sx_report(SX_ERROR, "Invalid prefix-range %s: min %lu < masklen %u\n",
text, min, p.masklen);
return 0;
};
if (af == AF_INET && max > 32) {
sx_report(SX_ERROR, "Invalid prefix-range %s: max %lu > 32\n",
text, max);
return 0;
} else if (af == AF_INET6 && max > 128) {
sx_report(SX_ERROR, "Invalid ipv6 prefix-range %s: max %lu > 128\n",
text, max);
return 0;
};
if (max > maxlen)
max = maxlen;
SX_DEBUG(debug_expander, "parsed prefix-range %s as %lu-%lu (maxlen: %u)\n",
text, min, max, maxlen);
sx_radix_tree_insert_specifics(tree, p, min, max);
return 1;
};
struct sx_prefix*
sx_prefix_new(int af, char* text)
{
struct sx_prefix* p=NULL;
if(!text) return NULL;
p=sx_prefix_alloc(NULL);
if(!p) return NULL;
if(!sx_prefix_parse(p,af,text)) {
sx_prefix_destroy(p);
return NULL;
};
return p;
};
int
sx_prefix_fprint(FILE* f, struct sx_prefix* p)
{
char buffer[128];
if(!p) {
fprintf(f?f:stdout,"(null)");
return 0;
};
inet_ntop(p->family,&p->addr,buffer,sizeof(buffer));
return fprintf(f?f:stdout,"%s/%i",buffer,p->masklen);
};
int
sx_prefix_snprintf_sep(struct sx_prefix* p, char* rbuffer, int srb, char* sep)
{
char buffer[128];
if(!sep) sep="/";
if(!p) {
snprintf(rbuffer,srb,"(null)");
return 0;
};
inet_ntop(p->family,&p->addr,buffer,sizeof(buffer));
return snprintf(rbuffer,srb,"%s%s%i",buffer,sep,p->masklen);
};
int
sx_prefix_snprintf(struct sx_prefix* p, char* rbuffer, int srb)
{
return sx_prefix_snprintf_sep(p, rbuffer, srb, "/");
};
int
sx_prefix_snprintf_fmt(struct sx_prefix* p, char* buffer, int size,
const char* name, const char* format)
{
unsigned off=0;
const char* c=format;
struct sx_prefix q;
while(*c) {
if(*c=='%') {
switch(*(c+1)) {
case 'r':
case 'n':
inet_ntop(p->family,&p->addr,buffer+off,size-off);
off=strlen(buffer);
break;
case 'l':
off+=snprintf(buffer+off,size-off,"%i",p->masklen);
break;
case '%':
buffer[off++]='%';
break;
case 'N':
off+=snprintf(buffer+off,size-off,"%s",name);
break;
case 'm':
sx_prefix_mask(p, &q);
inet_ntop(p->family,&q.addr,buffer+off,size-off);
off=strlen(buffer);
break;
case 'i':
sx_prefix_imask(p, &q);
inet_ntop(p->family,&q.addr,buffer+off,size-off);
off=strlen(buffer);
break;
default :
sx_report(SX_ERROR, "Unknown format char '%c'\n", *(c+1));
return 0;
};
c+=2;
} else if (*c=='\\') {
switch(*(c+1)) {
case 'n':
buffer[off++]='\n'; break;
case 't':
buffer[off++]='\t'; break;
case '\\':
buffer[off++]='\\'; break;
default:
buffer[off++]=*(c+1);
break;
};
c+=2;
} else {
buffer[off++]=*c;
c++;
};
};
return strlen(buffer);
};
int
sx_prefix_jsnprintf(struct sx_prefix* p, char* rbuffer, int srb)
{
char buffer[128];
if(!p) {
snprintf(rbuffer,srb,"(null)");
return 0;
};
inet_ntop(p->family,&p->addr,buffer,sizeof(buffer));
return snprintf(rbuffer,srb,"%s\\/%i",buffer,p->masklen);
};
struct sx_radix_tree*
sx_radix_tree_new(int af)
{
struct sx_radix_tree* rt=malloc(sizeof(struct sx_radix_tree));
if(!rt) {
return NULL;
};
memset(rt,0,sizeof(struct sx_radix_tree));
rt->family=af;
return rt;
};
int
sx_radix_tree_empty(struct sx_radix_tree* t)
{
return t->head == NULL;
};
struct sx_radix_node*
sx_radix_node_new(struct sx_prefix* prefix)
{
struct sx_radix_node* rn=malloc(sizeof(struct sx_radix_node));
if(!rn) return NULL;
memset(rn,0,sizeof(struct sx_radix_node));
if(prefix) {
rn->prefix=*prefix; /* structure copy */
};
return rn;
};
int
sx_prefix_eqbits(struct sx_prefix* a, struct sx_prefix* b)
{
int i;
int nbytes=(a->family==AF_INET?4:16);
for(i=0;i<nbytes;i++) {
if(a->addr.addrs[i]==b->addr.addrs[i]) continue;
else {
int j;
for(j=0;j<8 && i*8+j<=a->masklen && i*8+j<=b->masklen;j++) {
if((a->addr.addrs[i]&(0x80>>j))!=(b->addr.addrs[i]&(0x80>>j)))
return i*8+j;
};
};
};
if(a->masklen<b->masklen) return a->masklen;
return b->masklen;
};
struct sx_prefix*
sx_prefix_overlay(struct sx_prefix* p, int n)
{
struct sx_prefix* sp=sx_prefix_alloc(p);
sp->masklen=n;
sx_prefix_adjust_masklen(sp);
return sp;
};
void
sx_radix_tree_unlink(struct sx_radix_tree* tree, struct sx_radix_node* node)
{
next:
if(node->r && node->l) {
node->isGlue=1;
} else if(node->r) {
if(node->parent) {
if(node->parent->r==node) {
node->parent->r=node->r;
node->r->parent=node->parent;
} else if(node->parent->l==node) {
node->parent->l=node->r;
node->r->parent=node->parent;
} else {
sx_report(SX_ERROR,"Unlinking node which is not descendant "
"of its parent\n");
};
} else if(tree->head==node) {
/* only one case, really */
tree->head=node->r;
node->r->parent=NULL;
} else {
sx_report(SX_ERROR,"Unlinking node with no parent and not root\n");
};
return;
} else if(node->l) {
if(node->parent) {
if(node->parent->r==node) {
node->parent->r=node->l;
node->l->parent=node->parent;
} else if(node->parent->l==node) {
node->parent->l=node->l;
node->l->parent=node->parent;
} else {
sx_report(SX_ERROR,"Unlinking node which is not descendant "
"of its parent\n");
};
} else if(tree->head==node) {
tree->head=node->l;
node->l->parent=NULL;
} else {
sx_report(SX_ERROR,"Unlinking node with no parent and not root\n");
};
return;
} else {
/* the only case - node does not have descendants */
if(node->parent) {
if(node->parent->l==node) node->parent->l=NULL;
else if(node->parent->r==node) node->parent->r=NULL;
else {
sx_report(SX_ERROR,"Unlinking node which is not descendant "
"of its parent\n");
};
if(node->parent->isGlue) {
node=node->parent;
goto next;
};
} else if(tree->head==node) {
tree->head=NULL;
} else {
sx_report(SX_ERROR,"Unlinking node with no parent and not root\n");
};
return;
};
};
struct sx_radix_node*
sx_radix_tree_lookup(struct sx_radix_tree* tree, struct sx_prefix* prefix)
{
int eb;
struct sx_radix_node* candidate=NULL, *chead;
if(!tree || !prefix) return NULL;
if(tree->family!=prefix->family) return NULL;
if(!tree->head) return NULL;
chead=tree->head;
next:
eb=sx_prefix_eqbits(&chead->prefix,prefix);
if(eb==chead->prefix.masklen && eb==prefix->masklen) {
/* they are equal */
if(chead->isGlue) return candidate;
return chead;
} else if(eb<chead->prefix.masklen) {
return candidate;
} else if(eb<prefix->masklen) {
/* it equals chead->masklen */
if(sx_prefix_isbitset(prefix,eb+1)) {
if(chead->r) {
if(!chead->isGlue) {
candidate=chead;
};
chead=chead->r;
goto next;
} else {
if(chead->isGlue) return candidate;
return chead;
};
} else {
if(chead->l) {
if(!chead->isGlue) {
candidate=chead;
};
chead=chead->l;
goto next;
} else {
if(chead->isGlue) return candidate;
return chead;
};
};
} else {
char pbuffer[128], cbuffer[128];
sx_prefix_snprintf(prefix,pbuffer,sizeof(pbuffer));
sx_prefix_snprintf(&chead->prefix,cbuffer,sizeof(cbuffer));
printf("Unreachible point... eb=%i, prefix=%s, chead=%s\n", eb,
pbuffer, cbuffer);
abort();
};
};
struct sx_radix_node*
sx_radix_tree_insert(struct sx_radix_tree* tree, struct sx_prefix* prefix)
{
int eb;
struct sx_radix_node** candidate=NULL, *chead;
if(!tree || !prefix) return NULL;
if(tree->family!=prefix->family) {
return NULL;
};
if(!tree->head) {
tree->head=sx_radix_node_new(prefix);
return tree->head;
};
candidate=&tree->head;
chead=tree->head;
next:
eb=sx_prefix_eqbits(prefix,&chead->prefix);
if(eb<prefix->masklen && eb<chead->prefix.masklen) {
struct sx_prefix neoRoot=*prefix;
struct sx_radix_node* rn, *ret=sx_radix_node_new(prefix);
neoRoot.masklen=eb;
sx_prefix_adjust_masklen(&neoRoot);
rn=sx_radix_node_new(&neoRoot);
if(!rn) {
sx_report(SX_ERROR,"Unable to create node: %s\n", strerror(errno));
return NULL;
};
if(sx_prefix_isbitset(prefix,eb+1)) {
rn->l=chead;
rn->r=ret;
} else {
rn->l=ret;
rn->r=chead;
};
rn->parent=chead->parent;
chead->parent=rn;
ret->parent=rn;
rn->isGlue=1;
*candidate=rn;
return ret;
} else if(eb==prefix->masklen && eb<chead->prefix.masklen) {
struct sx_radix_node* ret=sx_radix_node_new(prefix);
if(sx_prefix_isbitset(&chead->prefix,eb+1)) {
ret->r=chead;
} else {
ret->l=chead;
};
ret->parent=chead->parent;
chead->parent=ret;
*candidate=ret;
return ret;
} else if(eb==chead->prefix.masklen && eb<prefix->masklen) {
if(sx_prefix_isbitset(prefix,eb+1)) {
if(chead->r) {
candidate=&chead->r;
chead=chead->r;
goto next;
} else {
chead->r=sx_radix_node_new(prefix);
chead->r->parent=chead;
return chead->r;
};
} else {
if(chead->l) {
candidate=&chead->l;
chead=chead->l;
goto next;
} else {
chead->l=sx_radix_node_new(prefix);
chead->l->parent=chead;
return chead->l;
};
};
} else if(eb==chead->prefix.masklen && eb==prefix->masklen) {
/* equal routes... */
if(chead->isGlue) {
chead->isGlue=0;
};
return chead;
} else {
char pbuffer[128], cbuffer[128];
sx_prefix_snprintf(prefix,pbuffer,sizeof(pbuffer));
sx_prefix_snprintf(&chead->prefix,cbuffer,sizeof(cbuffer));
printf("Unreachible point... eb=%i, prefix=%s, chead=%s\n", eb,
pbuffer, cbuffer);
abort();
};
};
void
sx_radix_node_fprintf(struct sx_radix_node* node, void* udata)
{
FILE* out=(udata?udata:stdout);
char buffer[128];
if(!node) {
fprintf(out,"(null)\n");
} else {
sx_prefix_snprintf(&node->prefix,buffer,sizeof(buffer));
fprintf(out,"%s %s\n", buffer, node->isGlue?"(glue)":"");
};
};
int
sx_radix_node_foreach(struct sx_radix_node* node,
void (*func)(struct sx_radix_node*, void*), void* udata)
{
func(node,udata);
if(node->l) sx_radix_node_foreach(node->l,func,udata);
if(node->r) sx_radix_node_foreach(node->r,func,udata);
return 0;
};
int
sx_radix_tree_foreach(struct sx_radix_tree* tree,
void (*func)(struct sx_radix_node*, void*), void* udata)
{
if(!func || !tree || !tree->head) return 0;
sx_radix_node_foreach(tree->head,func,udata);
return 0;
};
int
sx_radix_node_aggregate(struct sx_radix_node* node)
{
if(node->l)
sx_radix_node_aggregate(node->l);
if(node->r)
sx_radix_node_aggregate(node->r);
if(debug_aggregation) {
printf("Aggregating on node: ");
sx_prefix_fprint(stdout,&node->prefix);
printf(" %s%s%u,%u\n", node->isGlue?"Glue ":"",
node->isAggregate?"Aggregate ":"",node->aggregateLow,
node->aggregateHi);
if(node->r) {
printf("R-Tree: ");
sx_prefix_fprint(stdout,&node->r->prefix);
printf(" %s%s%u,%u\n", (node->r->isGlue)?"Glue ":"",
(node->r->isAggregate)?"Aggregate ":"",
node->r->aggregateLow,node->r->aggregateHi);
if(node->r->son) {
printf("R-Son: ");
sx_prefix_fprint(stdout,&node->r->son->prefix);
printf(" %s%s%u,%u\n",node->r->son->isGlue?"Glue ":"",
node->r->son->isAggregate?"Aggregate ":"",
node->r->son->aggregateLow,node->r->son->aggregateHi);
};
};
if(node->l) {
printf("L-Tree: ");
sx_prefix_fprint(stdout,&node->l->prefix);
printf(" %s%s%u,%u\n",node->l->isGlue?"Glue ":"",
node->l->isAggregate?"Aggregate ":"",
node->l->aggregateLow,node->l->aggregateHi);
if(node->l->son) {
printf("L-Son: ");
sx_prefix_fprint(stdout,&node->l->son->prefix);
printf(" %s%s%u,%u\n",node->l->son->isGlue?"Glue ":"",
node->l->son->isAggregate?"Aggregate ":"",
node->l->son->aggregateLow,node->l->son->aggregateHi);
};
};
};
if(node->r && node->l) {
if(!node->r->isAggregate && !node->l->isAggregate &&
!node->r->isGlue && !node->l->isGlue &&
node->r->prefix.masklen==node->l->prefix.masklen) {
if(node->r->prefix.masklen==node->prefix.masklen+1) {
node->isAggregate=1;
node->r->isGlue=1;
node->l->isGlue=1;
node->aggregateHi=node->r->prefix.masklen;
if(node->isGlue) {
node->isGlue=0;
node->aggregateLow=node->r->prefix.masklen;
} else {
node->aggregateLow=node->prefix.masklen;
};
};
if(node->r->son && node->l->son &&
node->r->son->isAggregate && node->l->son->isAggregate &&
node->r->son->aggregateHi==node->l->son->aggregateHi &&
node->r->son->aggregateLow==node->l->son->aggregateLow &&
node->r->prefix.masklen==node->prefix.masklen+1 &&
node->l->prefix.masklen==node->prefix.masklen+1)
{
node->son=sx_radix_node_new(&node->prefix);
node->son->isGlue=0;
node->son->isAggregate=1;
node->son->aggregateHi=node->r->son->aggregateHi;
node->son->aggregateLow=node->r->son->aggregateLow;
node->r->son->isGlue=1;
node->l->son->isGlue=1;
};
} else if(node->r->isAggregate && node->l->isAggregate &&
node->r->aggregateHi==node->l->aggregateHi &&
node->r->aggregateLow==node->l->aggregateLow) {
if(node->r->prefix.masklen==node->prefix.masklen+1 &&
node->l->prefix.masklen==node->prefix.masklen+1) {
if(node->isGlue) {
node->r->isGlue=1;
node->l->isGlue=1;
node->isAggregate=1;
node->isGlue=0;
node->aggregateHi=node->r->aggregateHi;
node->aggregateLow=node->r->aggregateLow;
} else if(node->r->prefix.masklen==node->r->aggregateLow) {
node->r->isGlue=1;
node->l->isGlue=1;
node->isAggregate=1;
node->aggregateHi=node->r->aggregateHi;
node->aggregateLow=node->prefix.masklen;
} else {
node->son=sx_radix_node_new(&node->prefix);
node->son->isGlue=0;
node->son->isAggregate=1;
node->son->aggregateHi=node->r->aggregateHi;
node->son->aggregateLow=node->r->aggregateLow;
node->r->isGlue=1;
node->l->isGlue=1;
if(node->r->son && node->l->son &&
node->r->son->aggregateHi==node->l->son->aggregateHi &&
node->r->son->aggregateLow==node->l->son->aggregateLow)
{
node->son->son=sx_radix_node_new(&node->prefix);
node->son->son->isGlue=0;
node->son->son->isAggregate=1;
node->son->son->aggregateHi=node->r->son->aggregateHi;
node->son->son->aggregateLow=node->r->son->aggregateLow;
node->r->son->isGlue=1;
node->l->son->isGlue=1;
};
};
};
} else if(node->l->son &&
node->r->isAggregate && node->l->son->isAggregate &&
node->r->aggregateHi==node->l->son->aggregateHi &&
node->r->aggregateLow==node->l->son->aggregateLow) {
if(node->r->prefix.masklen==node->prefix.masklen+1 &&
node->l->prefix.masklen==node->prefix.masklen+1) {
if(node->isGlue) {
node->r->isGlue=1;
node->l->son->isGlue=1;
node->isAggregate=1;
node->isGlue=0;
node->aggregateHi=node->r->aggregateHi;
node->aggregateLow=node->r->aggregateLow;
} else {
node->son=sx_radix_node_new(&node->prefix);
node->son->isGlue=0;
node->son->isAggregate=1;
node->son->aggregateHi=node->r->aggregateHi;
node->son->aggregateLow=node->r->aggregateLow;
node->r->isGlue=1;
node->l->son->isGlue=1;
};
};
} else if(node->r->son &&
node->l->isAggregate && node->r->son->isAggregate &&
node->l->aggregateHi==node->r->son->aggregateHi &&
node->l->aggregateLow==node->r->son->aggregateLow) {
if(node->l->prefix.masklen==node->prefix.masklen+1 &&
node->r->prefix.masklen==node->prefix.masklen+1) {
if(node->isGlue) {
node->l->isGlue=1;
node->r->son->isGlue=1;
node->isAggregate=1;
node->isGlue=0;
node->aggregateHi=node->l->aggregateHi;
node->aggregateLow=node->l->aggregateLow;
} else {
node->son=sx_radix_node_new(&node->prefix);
node->son->isGlue=0;
node->son->isAggregate=1;
node->son->aggregateHi=node->l->aggregateHi;
node->son->aggregateLow=node->l->aggregateLow;
node->l->isGlue=1;
node->r->son->isGlue=1;
};
};
};
};
return 0;
};
int
sx_radix_tree_aggregate(struct sx_radix_tree* tree)
{
if(tree && tree->head) return sx_radix_node_aggregate(tree->head);
return 0;
};
static void
setGlueUpTo(struct sx_radix_node* node, void* udata)
{
unsigned refine=*(unsigned*)udata;
if(node && node->prefix.masklen <= refine) {
node->isGlue=1;
};
};
static void
sx_radix_node_hyperaggregate(struct sx_radix_node* node, unsigned max)
{
if(!node->isGlue) {
node->isAggregate=0;
if(node->l)
sx_radix_node_foreach(node->l, setGlueUpTo, &max);
if(node->r)
sx_radix_node_foreach(node->r, setGlueUpTo, &max);
} else {
if(node->l)
sx_radix_node_hyperaggregate(node->l, max);
if(node->r)
sx_radix_node_hyperaggregate(node->r, max);
};
};
int
sx_radix_tree_hyperaggregate(struct sx_radix_tree* tree)
{
if(tree && tree->head) {
unsigned max = tree->family == AF_INET ? 32 : 128;
sx_radix_node_hyperaggregate(tree->head, max);
};
return 0;
};
int
sx_radix_node_refine(struct sx_radix_node* node, unsigned refine)
{
if(!node->isGlue && node->prefix.masklen<refine) {
node->isAggregate=1;
node->aggregateLow=node->prefix.masklen;
node->aggregateHi=refine;
if(node->l) {
sx_radix_node_foreach(node->l, setGlueUpTo, &refine);
sx_radix_node_refine(node->l, refine);
};
if(node->r) {
sx_radix_node_foreach(node->r, setGlueUpTo, &refine);
sx_radix_node_refine(node->r, refine);
};
} else if(!node->isGlue && node->prefix.masklen==refine) {
/* not setting aggregate in this case */
if(node->l) sx_radix_node_refine(node->l, refine);
if(node->r) sx_radix_node_refine(node->r, refine);
} else if(node->isGlue) {
if(node->r) sx_radix_node_refine(node->r, refine);
if(node->l) sx_radix_node_refine(node->l, refine);
} else {
/* node->prefix.masklen > refine */
/* do nothing, should pass specifics 'as is'. Also, do not
process any embedded routes, their masklen is bigger, too...
node->isGlue=1;
if(node->l) sx_radix_node_foreach(node->l, setGlue, NULL);
if(node->r) sx_radix_node_foreach(node->r, setGlue, NULL);
*/
};
return 0;
};
int
sx_radix_tree_refine(struct sx_radix_tree* tree, unsigned refine)
{
if(tree && tree->head) return sx_radix_node_refine(tree->head, refine);
return 0;
};
static void
setGlueFrom(struct sx_radix_node* node, void* udata)
{
unsigned refine=*(unsigned*)udata;
if(node && node->prefix.masklen <= refine) {
node->isGlue=1;
};
};
static int
sx_radix_node_refineLow(struct sx_radix_node* node, unsigned refineLow)
{
if(!node->isGlue && node->prefix.masklen<=refineLow) {
if(!node->isAggregate) {
node->isAggregate=1;
node->aggregateLow=refineLow;
if(node->prefix.family == AF_INET) {
node->aggregateHi=32;
} else {
node->aggregateHi=128;
}
} else {
node->aggregateLow=refineLow;
};
if(node->l) {
sx_radix_node_foreach(node->l, setGlueFrom, &refineLow);
sx_radix_node_refineLow(node->l, refineLow);
};
if(node->r) {
sx_radix_node_foreach(node->r, setGlueFrom, &refineLow);
sx_radix_node_refineLow(node->r, refineLow);
};
} else if(!node->isGlue && node->prefix.masklen==refineLow) {
/* not setting aggregate in this case */
if(node->l) sx_radix_node_refineLow(node->l, refineLow);
if(node->r) sx_radix_node_refineLow(node->r, refineLow);
} else if(node->isGlue) {
if(node->r) sx_radix_node_refineLow(node->r, refineLow);
if(node->l) sx_radix_node_refineLow(node->l, refineLow);
} else {
/* node->prefix.masklen > refine */
/* do nothing, should pass specifics 'as is'. Also, do not
process any embedded routes, their masklen is bigger, too...
node->isGlue=1;
if(node->l) sx_radix_node_foreach(node->l, setGlue, NULL);
if(node->r) sx_radix_node_foreach(node->r, setGlue, NULL);
*/
};
return 0;
};
int
sx_radix_tree_refineLow(struct sx_radix_tree* tree, unsigned refineLow)
{
if(tree && tree->head)
return sx_radix_node_refineLow(tree->head, refineLow);
return 0;
};
#if SX_PTREE_TEST
int
main() {