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/* $OpenBSD: rde_prefix.c,v 1.30 2009/12/01 14:28:05 claudio Exp $ */
/*
* Copyright (c) 2003, 2004 Claudio Jeker <claudio@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "bgpd.h"
#include "rde.h"
/*
* Prefix Table functions:
* pt_add: create new prefix and link it into the prefix table
* pt_remove: Checks if there is no bgp prefix linked to the prefix,
* unlinks from the prefix table and frees the pt_entry.
* pt_get: get a prefix/prefixlen entry. While pt_lookup searches for the
* best matching prefix pt_get only finds the prefix/prefixlen
* entry. The speed of pt_get is important for the bgp updates.
* pt_getaddr: convert the address into a struct bgpd_addr.
* pt_lookup: lookup a IP in the prefix table. Mainly for "show ip bgp".
* pt_empty: returns true if there is no bgp prefix linked to the pt_entry.
* pt_init: initialize prefix table.
* pt_alloc: allocate a AF specific pt_entry. Internal function.
* pt_free: free a pt_entry. Internal function.
*/
/* internal prototypes */
static struct pt_entry *pt_alloc(struct pt_entry *);
static void pt_free(struct pt_entry *);
size_t pt_sizes[AID_MAX] = AID_PTSIZE;
RB_HEAD(pt_tree, pt_entry);
RB_PROTOTYPE(pt_tree, pt_entry, pt_e, pt_prefix_cmp);
RB_GENERATE(pt_tree, pt_entry, pt_e, pt_prefix_cmp);
struct pt_tree pttable;
void
pt_init(void)
{
RB_INIT(&pttable);
}
void
pt_shutdown(void)
{
if (!RB_EMPTY(&pttable))
log_debug("pt_shutdown: tree is not empty.");
}
void
pt_getaddr(struct pt_entry *pte, struct bgpd_addr *addr)
{
bzero(addr, sizeof(struct bgpd_addr));
addr->aid = pte->aid;
switch (addr->aid) {
case AID_INET:
addr->v4 = ((struct pt_entry4 *)pte)->prefix4;
break;
case AID_INET6:
memcpy(&addr->v6, &((struct pt_entry6 *)pte)->prefix6,
sizeof(addr->v6));
/* XXX scope_id ??? */
break;
default:
fatalx("pt_getaddr: unknown af");
}
}
struct pt_entry *
pt_fill(struct bgpd_addr *prefix, int prefixlen)
{
static struct pt_entry4 pte4;
static struct pt_entry6 pte6;
in_addr_t addr_hbo;
switch (prefix->aid) {
case AID_INET:
bzero(&pte4, sizeof(pte4));
if (af2aid(AF_INET, 0, &pte4.aid))
fatalx("pt_fill: unknown aid");
if (prefixlen > 32)
fatalx("pt_fill: bad IPv4 prefixlen");
addr_hbo = ntohl(prefix->v4.s_addr);
pte4.prefix4.s_addr = htonl(addr_hbo &
prefixlen2mask(prefixlen));
pte4.prefixlen = prefixlen;
return ((struct pt_entry *)&pte4);
case AID_INET6:
bzero(&pte6, sizeof(pte6));
if (af2aid(AF_INET6, 0, &pte6.aid))
fatalx("pt_fill: unknown aid");
if (prefixlen > 128)
fatalx("pt_get: bad IPv6 prefixlen");
pte6.prefixlen = prefixlen;
inet6applymask(&pte6.prefix6, &prefix->v6, prefixlen);
return ((struct pt_entry *)&pte6);
default:
log_warnx("pt_fill: unknown af");
return (NULL);
}
}
struct pt_entry *
pt_get(struct bgpd_addr *prefix, int prefixlen)
{
struct pt_entry *pte;
pte = pt_fill(prefix, prefixlen);
return RB_FIND(pt_tree, &pttable, pte);
}
struct pt_entry *
pt_add(struct bgpd_addr *prefix, int prefixlen)
{
struct pt_entry *p = NULL;
p = pt_fill(prefix, prefixlen);
p = pt_alloc(p);
if (RB_INSERT(pt_tree, &pttable, p) != NULL) {
log_warnx("pt_add: insert failed");
return (NULL);
}
return (p);
}
void
pt_remove(struct pt_entry *pte)
{
if (!pt_empty(pte))
fatalx("pt_remove: entry still holds references");
if (RB_REMOVE(pt_tree, &pttable, pte) == NULL)
log_warnx("pt_remove: remove failed.");
pt_free(pte);
}
struct pt_entry *
pt_lookup(struct bgpd_addr *addr)
{
struct pt_entry *p;
int i;
switch (addr->aid) {
case AID_INET:
i = 32;
break;
case AID_INET6:
i = 128;
break;
default:
fatalx("pt_lookup: unknown af");
}
for (; i >= 0; i--) {
p = pt_get(addr, i);
if (p != NULL)
return (p);
}
return (NULL);
}
int
pt_prefix_cmp(const struct pt_entry *a, const struct pt_entry *b)
{
const struct pt_entry4 *a4, *b4;
const struct pt_entry6 *a6, *b6;
int i;
if (a->aid > b->aid)
return (1);
if (a->aid < b->aid)
return (-1);
switch (a->aid) {
case AID_INET:
a4 = (const struct pt_entry4 *)a;
b4 = (const struct pt_entry4 *)b;
if (ntohl(a4->prefix4.s_addr) > ntohl(b4->prefix4.s_addr))
return (1);
if (ntohl(a4->prefix4.s_addr) < ntohl(b4->prefix4.s_addr))
return (-1);
if (a4->prefixlen > b4->prefixlen)
return (1);
if (a4->prefixlen < b4->prefixlen)
return (-1);
return (0);
case AID_INET6:
a6 = (const struct pt_entry6 *)a;
b6 = (const struct pt_entry6 *)b;
i = memcmp(&a6->prefix6, &b6->prefix6, sizeof(struct in6_addr));
if (i > 0)
return (1);
if (i < 0)
return (-1);
if (a6->prefixlen < b6->prefixlen)
return (-1);
if (a6->prefixlen > b6->prefixlen)
return (1);
return (0);
default:
fatalx("pt_prefix_cmp: unknown af");
}
return (-1);
}
/*
* Returns a pt_entry cloned from the one passed in.
* Function may not return on failure.
*/
static struct pt_entry *
pt_alloc(struct pt_entry *op)
{
struct pt_entry *p;
p = malloc(pt_sizes[op->aid]);
if (p == NULL)
fatal("pt_alloc");
rdemem.pt_cnt[op->aid]++;
memcpy(p, op, pt_sizes[op->aid]);
return (p);
}
static void
pt_free(struct pt_entry *pte)
{
rdemem.pt_cnt[pte->aid]--;
free(pte);
}
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