minix/servers/inet/generic/ipr.c

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2005-04-21 16:53:53 +02:00
/*
ipr.c
Copyright 1995 Philip Homburg
*/
#include "inet.h"
#include "clock.h"
#include "type.h"
#include "assert.h"
#include "buf.h"
#include "event.h"
#include "io.h"
#include "ip_int.h"
#include "ipr.h"
THIS_FILE
#define OROUTE_NR 128
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#define OROUTE_STATIC_NR 16
#define OROUTE_HASH_ASS_NR 4
#define OROUTE_HASH_NR 32
#define OROUTE_HASH_MASK (OROUTE_HASH_NR-1)
#define hash_oroute(port_nr, ipaddr, hash_tmp) (hash_tmp= (ipaddr), \
hash_tmp= (hash_tmp >> 20) ^ hash_tmp, \
hash_tmp= (hash_tmp >> 10) ^ hash_tmp, \
hash_tmp= (hash_tmp >> 5) ^ hash_tmp, \
(hash_tmp + (port_nr)) & OROUTE_HASH_MASK)
typedef struct oroute_hash
{
ipaddr_t orh_addr;
oroute_t *orh_route;
} oroute_hash_t;
PRIVATE oroute_t oroute_table[OROUTE_NR];
PRIVATE oroute_t *oroute_head;
PRIVATE int static_oroute_nr;
PRIVATE oroute_hash_t oroute_hash_table[OROUTE_HASH_NR][OROUTE_HASH_ASS_NR];
#define IROUTE_NR 512
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#define IROUTE_HASH_ASS_NR 4
#define IROUTE_HASH_NR 32
#define IROUTE_HASH_MASK (IROUTE_HASH_NR-1)
#define hash_iroute(port_nr, ipaddr, hash_tmp) (hash_tmp= (ipaddr), \
hash_tmp= (hash_tmp >> 20) ^ hash_tmp, \
hash_tmp= (hash_tmp >> 10) ^ hash_tmp, \
hash_tmp= (hash_tmp >> 5) ^ hash_tmp, \
(hash_tmp + (port_nr)) & IROUTE_HASH_MASK)
typedef struct iroute_hash
{
ipaddr_t irh_addr;
iroute_t *irh_route;
} iroute_hash_t;
PRIVATE iroute_t iroute_table[IROUTE_NR];
PRIVATE iroute_hash_t iroute_hash_table[IROUTE_HASH_NR][IROUTE_HASH_ASS_NR];
FORWARD oroute_t *oroute_find_ent ARGS(( int port_nr, ipaddr_t dest ));
FORWARD void oroute_del ARGS(( oroute_t *oroute ));
FORWARD oroute_t *sort_dists ARGS(( oroute_t *oroute ));
FORWARD oroute_t *sort_gws ARGS(( oroute_t *oroute ));
FORWARD void oroute_uncache_nw ARGS(( ipaddr_t dest, ipaddr_t netmask ));
FORWARD void iroute_uncache_nw ARGS(( ipaddr_t dest, ipaddr_t netmask ));
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PUBLIC void ipr_init()
{
int i;
oroute_t *oroute;
iroute_t *iroute;
for (i= 0, oroute= oroute_table; i<OROUTE_NR; i++, oroute++)
oroute->ort_flags= ORTF_EMPTY;
static_oroute_nr= 0;
assert(OROUTE_HASH_ASS_NR == 4);
for (i= 0, iroute= iroute_table; i<IROUTE_NR; i++, iroute++)
iroute->irt_flags= IRTF_EMPTY;
assert(IROUTE_HASH_ASS_NR == 4);
}
PUBLIC iroute_t *iroute_frag(port_nr, dest)
int port_nr;
ipaddr_t dest;
{
int hash, i;
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iroute_hash_t *iroute_hash;
iroute_hash_t tmp_hash;
iroute_t *iroute, *bestroute;
unsigned long hash_tmp;
u32_t tmp_mask;
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hash= hash_iroute(port_nr, dest, hash_tmp);
iroute_hash= &iroute_hash_table[hash][0];
if (iroute_hash[0].irh_addr == dest)
iroute= iroute_hash[0].irh_route;
else if (iroute_hash[1].irh_addr == dest)
{
tmp_hash= iroute_hash[1];
iroute_hash[1]= iroute_hash[0];
iroute_hash[0]= tmp_hash;
iroute= tmp_hash.irh_route;
}
else if (iroute_hash[2].irh_addr == dest)
{
tmp_hash= iroute_hash[2];
iroute_hash[2]= iroute_hash[1];
iroute_hash[1]= iroute_hash[0];
iroute_hash[0]= tmp_hash;
iroute= tmp_hash.irh_route;
}
else if (iroute_hash[3].irh_addr == dest)
{
tmp_hash= iroute_hash[3];
iroute_hash[3]= iroute_hash[2];
iroute_hash[2]= iroute_hash[1];
iroute_hash[1]= iroute_hash[0];
iroute_hash[0]= tmp_hash;
iroute= tmp_hash.irh_route;
}
else
iroute= NULL;
if (iroute)
return iroute;
bestroute= NULL;
for (i= 0, iroute= iroute_table; i < IROUTE_NR; i++, iroute++)
{
if (!(iroute->irt_flags & IRTF_INUSE))
continue;
if (((dest ^ iroute->irt_dest) & iroute->irt_subnetmask) != 0)
continue;
if (!bestroute)
{
bestroute= iroute;
continue;
}
/* More specific netmasks are better */
if (iroute->irt_subnetmask != bestroute->irt_subnetmask)
{
/* Using two ntohl macros in one expression
* is not allowed (tmp_l is modified twice)
*/
tmp_mask= ntohl(iroute->irt_subnetmask);
if (tmp_mask > ntohl(bestroute->irt_subnetmask))
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bestroute= iroute;
continue;
}
/* Dynamic routes override static routes */
if ((iroute->irt_flags & IRTF_STATIC) !=
(bestroute->irt_flags & IRTF_STATIC))
{
if (bestroute->irt_flags & IRTF_STATIC)
bestroute= iroute;
continue;
}
/* A route to the local interface give an opportunity
* to send redirects.
*/
if (iroute->irt_port != bestroute->irt_port)
{
if (iroute->irt_port == port_nr)
bestroute= iroute;
continue;
}
}
if (bestroute == NULL)
return NULL;
iroute_hash[3]= iroute_hash[2];
iroute_hash[2]= iroute_hash[1];
iroute_hash[1]= iroute_hash[0];
iroute_hash[0].irh_addr= dest;
iroute_hash[0].irh_route= bestroute;
return bestroute;
}
PUBLIC int oroute_frag(port_nr, dest, ttl, msgsize, nexthop)
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int port_nr;
ipaddr_t dest;
int ttl;
size_t msgsize;
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ipaddr_t *nexthop;
{
oroute_t *oroute;
oroute= oroute_find_ent(port_nr, dest);
if (!oroute || oroute->ort_dist > ttl)
return EDSTNOTRCH;
if (msgsize && oroute->ort_mtu &&
oroute->ort_mtu < msgsize)
{
return EPACKSIZE;
}
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*nexthop= oroute->ort_gateway;
return NW_OK;
}
PUBLIC int ipr_add_oroute(port_nr, dest, subnetmask, gateway,
timeout, dist, mtu, static_route, preference, oroute_p)
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int port_nr;
ipaddr_t dest;
ipaddr_t subnetmask;
ipaddr_t gateway;
time_t timeout;
int dist;
int mtu;
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int static_route;
i32_t preference;
oroute_t **oroute_p;
{
int i;
ip_port_t *ip_port;
oroute_t *oroute, *oldest_route, *prev, *nw_route, *gw_route,
*prev_route;
time_t currtim, exp_tim, exp_tim_orig;
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oldest_route= 0;
currtim= get_time();
if (timeout)
exp_tim= timeout+currtim;
else
exp_tim= 0;
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DBLOCK(0x10,
printf("ip[%d]: adding oroute to ", port_nr);
writeIpAddr(dest);
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printf("["); writeIpAddr(subnetmask); printf("] through ");
writeIpAddr(gateway);
printf(" timeout: %lds, distance %d, pref %ld, mtu %d\n",
(long)timeout/HZ, dist, (long)preference, mtu));
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ip_port= &ip_port_table[port_nr];
/* Validate gateway */
if (((gateway ^ ip_port->ip_ipaddr) & ip_port->ip_subnetmask) != 0)
{
DBLOCK(1, printf("ip[%d]: (ipr_add_oroute) invalid gateway: ",
port_nr); writeIpAddr(gateway); printf("\n"));
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return EINVAL;
}
if (static_route)
{
if (static_oroute_nr >= OROUTE_STATIC_NR)
return ENOMEM;
static_oroute_nr++;
}
else
{
/* Try to track down any old routes. */
for(oroute= oroute_head; oroute; oroute= oroute->ort_nextnw)
{
if (oroute->ort_port != port_nr)
continue;
if (oroute->ort_dest == dest &&
oroute->ort_subnetmask == subnetmask)
{
break;
}
}
for(; oroute; oroute= oroute->ort_nextgw)
{
if (oroute->ort_gateway == gateway)
break;
}
for(; oroute; oroute= oroute->ort_nextdist)
{
if ((oroute->ort_flags & ORTF_STATIC) != 0)
continue;
if (oroute->ort_dist > dist)
continue;
break;
}
if (oroute)
{
assert(oroute->ort_port == port_nr);
if (dest != 0)
{
/* The new expire should not be later
* than the old expire time. Except for
* default routes, where the expire time
* is simple set to the new value.
*/
exp_tim_orig= oroute->ort_exp_tim;
if (!exp_tim)
exp_tim= exp_tim_orig;
else if (exp_tim_orig &&
exp_tim > exp_tim_orig)
{
exp_tim= exp_tim_orig;
}
}
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oroute_del(oroute);
oroute->ort_flags= 0;
oldest_route= oroute;
}
}
if (oldest_route == NULL)
{
/* Look for an unused entry, or remove an existing one */
for (i= 0, oroute= oroute_table; i<OROUTE_NR; i++, oroute++)
{
if ((oroute->ort_flags & ORTF_INUSE) == 0)
break;
if (oroute->ort_exp_tim && oroute->ort_exp_tim <
currtim)
{
oroute_del(oroute);
oroute->ort_flags= 0;
break;
}
if (oroute->ort_flags & ORTF_STATIC)
continue;
if (oroute->ort_dest == 0)
{
/* Never remove default routes. */
continue;
}
if (oldest_route == NULL)
{
oldest_route= oroute;
continue;
}
if (oroute->ort_timestamp < oldest_route->ort_timestamp)
{
oldest_route= oroute;
}
}
if (i < OROUTE_NR)
oldest_route= oroute;
else
{
assert(oldest_route);
oroute_del(oldest_route);
oldest_route->ort_flags= 0;
}
}
oldest_route->ort_dest= dest;
oldest_route->ort_gateway= gateway;
oldest_route->ort_subnetmask= subnetmask;
oldest_route->ort_exp_tim= exp_tim;
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oldest_route->ort_timestamp= currtim;
oldest_route->ort_dist= dist;
oldest_route->ort_mtu= mtu;
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oldest_route->ort_port= port_nr;
oldest_route->ort_flags= ORTF_INUSE;
oldest_route->ort_pref= preference;
if (static_route)
oldest_route->ort_flags |= ORTF_STATIC;
/* Insert the route by tearing apart the routing table,
* and insert the entry during the reconstruction.
*/
for (prev= 0, nw_route= oroute_head; nw_route;
prev= nw_route, nw_route= nw_route->ort_nextnw)
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{
if (nw_route->ort_port != port_nr)
continue;
if (nw_route->ort_dest == dest &&
nw_route->ort_subnetmask == subnetmask)
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{
if (prev)
prev->ort_nextnw= nw_route->ort_nextnw;
else
oroute_head= nw_route->ort_nextnw;
break;
}
}
prev_route= nw_route;
for(prev= NULL, gw_route= nw_route; gw_route;
prev= gw_route, gw_route= gw_route->ort_nextgw)
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{
if (gw_route->ort_gateway == gateway)
{
if (prev)
prev->ort_nextgw= gw_route->ort_nextgw;
else
nw_route= gw_route->ort_nextgw;
break;
}
}
oldest_route->ort_nextdist= gw_route;
gw_route= oldest_route;
gw_route= sort_dists(gw_route);
gw_route->ort_nextgw= nw_route;
nw_route= gw_route;
nw_route= sort_gws(nw_route);
nw_route->ort_nextnw= oroute_head;
oroute_head= nw_route;
if (nw_route != prev_route)
oroute_uncache_nw(nw_route->ort_dest, nw_route->ort_subnetmask);
if (oroute_p != NULL)
*oroute_p= oldest_route;
return NW_OK;
}
PUBLIC int ipr_del_oroute(port_nr, dest, subnetmask, gateway, static_route)
int port_nr;
ipaddr_t dest;
ipaddr_t subnetmask;
ipaddr_t gateway;
int static_route;
{
int i;
oroute_t *oroute;
for(i= 0, oroute= oroute_table; i<OROUTE_NR; i++, oroute++)
{
if ((oroute->ort_flags & ORTF_INUSE) == 0)
continue;
if (oroute->ort_port != port_nr ||
oroute->ort_dest != dest ||
oroute->ort_subnetmask != subnetmask ||
oroute->ort_gateway != gateway)
{
continue;
}
if (!!(oroute->ort_flags & ORTF_STATIC) != static_route)
continue;
break;
}
if (i == OROUTE_NR)
return ESRCH;
if (static_route)
static_oroute_nr--;
oroute_del(oroute);
oroute->ort_flags &= ~ORTF_INUSE;
return NW_OK;
}
PUBLIC void ipr_chk_otab(port_nr, addr, mask)
int port_nr;
ipaddr_t addr;
ipaddr_t mask;
{
int i;
oroute_t *oroute;
DBLOCK(1,
printf("ip[%d] (ipr_chk_otab): addr ", port_nr);
writeIpAddr(addr);
printf(" mask ");
writeIpAddr(mask);
printf("\n");
);
if (addr == 0)
{
/* Special hack to flush entries for an interface that
* goes down.
*/
addr= mask= HTONL(0xffffffff);
}
for(i= 0, oroute= oroute_table; i<OROUTE_NR; i++, oroute++)
{
if ((oroute->ort_flags & ORTF_INUSE) == 0)
continue;
if (oroute->ort_port != port_nr ||
((oroute->ort_gateway ^ addr) & mask) == 0)
{
continue;
}
DBLOCK(1, printf("ip[%d] (ipr_chk_otab): deleting route to ",
port_nr);
writeIpAddr(oroute->ort_dest);
printf(" gw ");
writeIpAddr(oroute->ort_gateway);
printf("\n"));
if (oroute->ort_flags & ORTF_STATIC)
static_oroute_nr--;
oroute_del(oroute);
oroute->ort_flags &= ~ORTF_INUSE;
}
}
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PUBLIC void ipr_gateway_down(port_nr, gateway, timeout)
int port_nr;
ipaddr_t gateway;
time_t timeout;
{
oroute_t *route_ind;
time_t currtim;
int i;
int result;
currtim= get_time();
for (i= 0, route_ind= oroute_table; i<OROUTE_NR; i++, route_ind++)
{
if (!(route_ind->ort_flags & ORTF_INUSE))
continue;
if (route_ind->ort_gateway != gateway)
continue;
if (route_ind->ort_exp_tim && route_ind->ort_exp_tim < currtim)
continue;
result= ipr_add_oroute(port_nr, route_ind->ort_dest,
route_ind->ort_subnetmask, gateway,
timeout, ORTD_UNREACHABLE, route_ind->ort_mtu,
FALSE, 0, NULL);
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assert(result == NW_OK);
}
}
PUBLIC void ipr_destunrch(port_nr, dest, netmask, timeout)
int port_nr;
ipaddr_t dest;
ipaddr_t netmask;
time_t timeout;
{
oroute_t *oroute;
int result;
oroute= oroute_find_ent(port_nr, dest);
if (!oroute)
{
DBLOCK(1, printf("ip[%d]: got a dest unreachable for ",
port_nr);
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writeIpAddr(dest); printf("but no route present\n"));
return;
}
result= ipr_add_oroute(port_nr, dest, netmask, oroute->ort_gateway,
timeout, ORTD_UNREACHABLE, oroute->ort_mtu, FALSE, 0, NULL);
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assert(result == NW_OK);
}
PUBLIC void ipr_redirect(port_nr, dest, netmask, old_gateway, new_gateway,
timeout)
int port_nr;
ipaddr_t dest;
ipaddr_t netmask;
ipaddr_t old_gateway;
ipaddr_t new_gateway;
time_t timeout;
{
oroute_t *oroute;
ip_port_t *ip_port;
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int result;
ip_port= &ip_port_table[port_nr];
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oroute= oroute_find_ent(port_nr, dest);
if (!oroute)
{
DBLOCK(1, printf("ip[%d]: got a redirect for ", port_nr);
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writeIpAddr(dest); printf("but no route present\n"));
return;
}
if (oroute->ort_gateway != old_gateway)
{
DBLOCK(1, printf("ip[%d]: got a redirect from ", port_nr);
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writeIpAddr(old_gateway); printf(" for ");
writeIpAddr(dest); printf(" but curr gateway is ");
writeIpAddr(oroute->ort_gateway); printf("\n"));
return;
}
if ((new_gateway ^ ip_port->ip_ipaddr) & ip_port->ip_subnetmask)
{
DBLOCK(1, printf("ip[%d]: redirect from ", port_nr);
writeIpAddr(old_gateway); printf(" for ");
writeIpAddr(dest); printf(" but new gateway ");
writeIpAddr(new_gateway);
printf(" is not on local subnet\n"));
return;
}
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if (oroute->ort_flags & ORTF_STATIC)
{
if (oroute->ort_dest == dest)
{
DBLOCK(1, printf("ip[%d]: got a redirect for ",
port_nr);
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writeIpAddr(dest);
printf("but route is fixed\n"));
return;
}
}
else
{
result= ipr_add_oroute(port_nr, dest, netmask,
oroute->ort_gateway, HZ, ORTD_UNREACHABLE,
oroute->ort_mtu, FALSE, 0, NULL);
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assert(result == NW_OK);
}
result= ipr_add_oroute(port_nr, dest, netmask, new_gateway,
timeout, 1, oroute->ort_mtu, FALSE, 0, NULL);
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assert(result == NW_OK);
}
PUBLIC void ipr_ttl_exc(port_nr, dest, netmask, timeout)
int port_nr;
ipaddr_t dest;
ipaddr_t netmask;
time_t timeout;
{
oroute_t *oroute;
int new_dist;
int result;
oroute= oroute_find_ent(port_nr, dest);
if (!oroute)
{
DBLOCK(1, printf("ip[%d]: got a ttl exceeded for ",
port_nr);
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writeIpAddr(dest); printf("but no route present\n"));
return;
}
new_dist= oroute->ort_dist * 2;
if (new_dist > IP_DEF_TTL)
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{
new_dist= oroute->ort_dist+1;
if (new_dist >= IP_DEF_TTL)
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{
DBLOCK(1, printf("ip[%d]: got a ttl exceeded for ",
port_nr);
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writeIpAddr(dest);
printf(" but dist is %d\n",
oroute->ort_dist));
return;
}
}
result= ipr_add_oroute(port_nr, dest, netmask, oroute->ort_gateway,
timeout, new_dist, oroute->ort_mtu, FALSE, 0, NULL);
assert(result == NW_OK);
}
PUBLIC void ipr_mtu(port_nr, dest, mtu, timeout)
int port_nr;
ipaddr_t dest;
u16_t mtu;
time_t timeout;
{
oroute_t *oroute;
int result;
oroute= oroute_find_ent(port_nr, dest);
if (!oroute)
{
DBLOCK(1, printf("ip[%d]: got a mtu exceeded for ",
port_nr);
writeIpAddr(dest); printf("but no route present\n"));
return;
}
if (mtu < IP_MIN_MTU)
return;
if (oroute->ort_mtu && mtu >= oroute->ort_mtu)
return; /* Only decrease mtu */
result= ipr_add_oroute(port_nr, dest, HTONL(0xffffffff),
oroute->ort_gateway, timeout, oroute->ort_dist, mtu,
FALSE, 0, NULL);
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assert(result == NW_OK);
}
PUBLIC int ipr_get_oroute(ent_no, route_ent)
int ent_no;
nwio_route_t *route_ent;
{
oroute_t *oroute;
if (ent_no<0 || ent_no>= OROUTE_NR)
return ENOENT;
oroute= &oroute_table[ent_no];
if ((oroute->ort_flags & ORTF_INUSE) && oroute->ort_exp_tim &&
oroute->ort_exp_tim < get_time())
{
oroute_del(oroute);
oroute->ort_flags &= ~ORTF_INUSE;
}
route_ent->nwr_ent_no= ent_no;
route_ent->nwr_ent_count= OROUTE_NR;
route_ent->nwr_dest= oroute->ort_dest;
route_ent->nwr_netmask= oroute->ort_subnetmask;
route_ent->nwr_gateway= oroute->ort_gateway;
route_ent->nwr_dist= oroute->ort_dist;
route_ent->nwr_flags= NWRF_EMPTY;
if (oroute->ort_flags & ORTF_INUSE)
{
route_ent->nwr_flags |= NWRF_INUSE;
if (oroute->ort_flags & ORTF_STATIC)
route_ent->nwr_flags |= NWRF_STATIC;
}
route_ent->nwr_pref= oroute->ort_pref;
route_ent->nwr_mtu= oroute->ort_mtu;
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route_ent->nwr_ifaddr= ip_get_ifaddr(oroute->ort_port);
return NW_OK;
}
PRIVATE oroute_t *oroute_find_ent(port_nr, dest)
int port_nr;
ipaddr_t dest;
{
int hash;
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oroute_hash_t *oroute_hash;
oroute_hash_t tmp_hash;
oroute_t *oroute, *bestroute;
time_t currtim;
unsigned long hash_tmp;
u32_t tmp_mask;
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currtim= get_time();
hash= hash_oroute(port_nr, dest, hash_tmp);
oroute_hash= &oroute_hash_table[hash][0];
if (oroute_hash[0].orh_addr == dest)
oroute= oroute_hash[0].orh_route;
else if (oroute_hash[1].orh_addr == dest)
{
tmp_hash= oroute_hash[1];
oroute_hash[1]= oroute_hash[0];
oroute_hash[0]= tmp_hash;
oroute= tmp_hash.orh_route;
}
else if (oroute_hash[2].orh_addr == dest)
{
tmp_hash= oroute_hash[2];
oroute_hash[2]= oroute_hash[1];
oroute_hash[1]= oroute_hash[0];
oroute_hash[0]= tmp_hash;
oroute= tmp_hash.orh_route;
}
else if (oroute_hash[3].orh_addr == dest)
{
tmp_hash= oroute_hash[3];
oroute_hash[3]= oroute_hash[2];
oroute_hash[2]= oroute_hash[1];
oroute_hash[1]= oroute_hash[0];
oroute_hash[0]= tmp_hash;
oroute= tmp_hash.orh_route;
}
else
oroute= NULL;
if (oroute)
{
assert(oroute->ort_port == port_nr);
if (oroute->ort_exp_tim && oroute->ort_exp_tim<currtim)
{
oroute_del(oroute);
oroute->ort_flags &= ~ORTF_INUSE;
}
else
return oroute;
}
bestroute= NULL;
for (oroute= oroute_head; oroute; oroute= oroute->ort_nextnw)
{
if (((dest ^ oroute->ort_dest) & oroute->ort_subnetmask) != 0)
continue;
if (oroute->ort_port != port_nr)
continue;
if (!bestroute)
{
bestroute= oroute;
continue;
}
assert(oroute->ort_dest != bestroute->ort_dest);
/* Using two ntohl macros in one expression
* is not allowed (tmp_l is modified twice)
*/
tmp_mask= ntohl(oroute->ort_subnetmask);
if (tmp_mask > ntohl(bestroute->ort_subnetmask))
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{
bestroute= oroute;
continue;
}
}
if (bestroute == NULL)
return NULL;
oroute_hash[3]= oroute_hash[2];
oroute_hash[2]= oroute_hash[1];
oroute_hash[1]= oroute_hash[0];
oroute_hash[0].orh_addr= dest;
oroute_hash[0].orh_route= bestroute;
return bestroute;
}
PRIVATE void oroute_del(oroute)
oroute_t *oroute;
{
oroute_t *prev, *nw_route, *gw_route, *dist_route, *prev_route;
DBLOCK(0x10,
printf("ip[%d]: deleting oroute to ", oroute->ort_port);
writeIpAddr(oroute->ort_dest);
printf("["); writeIpAddr(oroute->ort_subnetmask);
printf("] through ");
writeIpAddr(oroute->ort_gateway);
printf(
" timestamp %lds, timeout: %lds, distance %d pref %ld mtu %ld ",
(long)oroute->ort_timestamp/HZ,
(long)oroute->ort_exp_tim/HZ, oroute->ort_dist,
(long)oroute->ort_pref, (long)oroute->ort_mtu);
printf("flags 0x%x\n", oroute->ort_flags));
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for (prev= NULL, nw_route= oroute_head; nw_route;
prev= nw_route, nw_route= nw_route->ort_nextnw)
{
if (oroute->ort_port == nw_route->ort_port &&
oroute->ort_dest == nw_route->ort_dest &&
oroute->ort_subnetmask == nw_route->ort_subnetmask)
{
break;
}
}
assert(nw_route);
if (prev)
prev->ort_nextnw= nw_route->ort_nextnw;
else
oroute_head= nw_route->ort_nextnw;
prev_route= nw_route;
for (prev= NULL, gw_route= nw_route; gw_route;
prev= gw_route, gw_route= gw_route->ort_nextgw)
{
if (oroute->ort_gateway == gw_route->ort_gateway)
break;
}
assert(gw_route);
if (prev)
prev->ort_nextgw= gw_route->ort_nextgw;
else
nw_route= gw_route->ort_nextgw;
for (prev= NULL, dist_route= gw_route; dist_route;
prev= dist_route, dist_route= dist_route->ort_nextdist)
{
if (oroute == dist_route)
break;
}
assert(dist_route);
if (prev)
prev->ort_nextdist= dist_route->ort_nextdist;
else
gw_route= dist_route->ort_nextdist;
gw_route= sort_dists(gw_route);
if (gw_route != NULL)
{
gw_route->ort_nextgw= nw_route;
nw_route= gw_route;
}
nw_route= sort_gws(nw_route);
if (nw_route != NULL)
{
nw_route->ort_nextnw= oroute_head;
oroute_head= nw_route;
}
if (nw_route != prev_route)
{
oroute_uncache_nw(prev_route->ort_dest,
prev_route->ort_subnetmask);
}
}
PRIVATE oroute_t *sort_dists(oroute)
oroute_t *oroute;
{
oroute_t *r, *prev, *best, *best_prev;
int best_dist, best_pref;
best= NULL;
best_dist= best_pref= 0;
best_prev= NULL;
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for (prev= NULL, r= oroute; r; prev= r, r= r->ort_nextdist)
{
if (best == NULL)
; /* Force assignment to best */
else if (r->ort_dist != best_dist)
{
if (r->ort_dist > best_dist)
continue;
}
else
{
if (r->ort_pref <= best_pref)
continue;
}
best= r;
best_prev= prev;
best_dist= r->ort_dist;
best_pref= r->ort_pref;
}
if (!best)
{
assert(oroute == NULL);
return oroute;
}
if (!best_prev)
{
assert(best == oroute);
return oroute;
}
best_prev->ort_nextdist= best->ort_nextdist;
best->ort_nextdist= oroute;
return best;
}
PRIVATE oroute_t *sort_gws(oroute)
oroute_t *oroute;
{
oroute_t *r, *prev, *best, *best_prev;
int best_dist, best_pref;
best= NULL;
best_dist= best_pref= 0;
best_prev= NULL;
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for (prev= NULL, r= oroute; r; prev= r, r= r->ort_nextgw)
{
if (best == NULL)
; /* Force assignment to best */
else if (r->ort_dist != best_dist)
{
if (r->ort_dist > best_dist)
continue;
}
else
{
if (r->ort_pref <= best_pref)
continue;
}
best= r;
best_prev= prev;
best_dist= r->ort_dist;
best_pref= r->ort_pref;
}
if (!best)
{
assert(oroute == NULL);
return oroute;
}
if (!best_prev)
{
assert(best == oroute);
return oroute;
}
best_prev->ort_nextgw= best->ort_nextgw;
best->ort_nextgw= oroute;
return best;
}
PRIVATE void oroute_uncache_nw(dest, netmask)
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ipaddr_t dest;
ipaddr_t netmask;
{
int i, j;
oroute_hash_t *oroute_hash;
for (i= 0, oroute_hash= &oroute_hash_table[0][0];
i<OROUTE_HASH_NR; i++, oroute_hash += OROUTE_HASH_ASS_NR)
{
for (j= 0; j<OROUTE_HASH_ASS_NR; j++)
{
if (((oroute_hash[j].orh_addr ^ dest) & netmask) == 0)
{
oroute_hash[j].orh_addr= 0;
oroute_hash[j].orh_route= NULL;
}
}
}
}
/*
* Input routing
*/
PUBLIC int ipr_get_iroute(ent_no, route_ent)
int ent_no;
nwio_route_t *route_ent;
{
iroute_t *iroute;
if (ent_no<0 || ent_no>= IROUTE_NR)
return ENOENT;
iroute= &iroute_table[ent_no];
route_ent->nwr_ent_no= ent_no;
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route_ent->nwr_ent_count= IROUTE_NR;
route_ent->nwr_dest= iroute->irt_dest;
route_ent->nwr_netmask= iroute->irt_subnetmask;
route_ent->nwr_gateway= iroute->irt_gateway;
route_ent->nwr_dist= iroute->irt_dist;
route_ent->nwr_flags= NWRF_EMPTY;
if (iroute->irt_flags & IRTF_INUSE)
{
route_ent->nwr_flags |= NWRF_INUSE;
if (iroute->irt_flags & IRTF_STATIC)
route_ent->nwr_flags |= NWRF_STATIC;
if (iroute->irt_dist == IRTD_UNREACHABLE)
route_ent->nwr_flags |= NWRF_UNREACHABLE;
}
route_ent->nwr_pref= 0;
route_ent->nwr_mtu= iroute->irt_mtu;
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route_ent->nwr_ifaddr= ip_get_ifaddr(iroute->irt_port);
return NW_OK;
}
PUBLIC int ipr_add_iroute(port_nr, dest, subnetmask, gateway,
dist, mtu, static_route, iroute_p)
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int port_nr;
ipaddr_t dest;
ipaddr_t subnetmask;
ipaddr_t gateway;
int dist;
int mtu;
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int static_route;
iroute_t **iroute_p;
{
int i;
iroute_t *iroute, *unused_route;
ip_port_t *ip_port;
ip_port= &ip_port_table[port_nr];
/* Check gateway */
if (((gateway ^ ip_port->ip_ipaddr) & ip_port->ip_subnetmask) != 0 &&
gateway != 0)
{
DBLOCK(1, printf("ip[%d] (ipr_add_iroute): invalid gateway: ",
port_nr);
writeIpAddr(gateway); printf("\n"));
return EINVAL;
}
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unused_route= NULL;
if (static_route)
{
/* Static routes are not reused automatically, so we look
* for an unused entry.
*/
for(i= 0, iroute= iroute_table; i<IROUTE_NR; i++, iroute++)
{
if ((iroute->irt_flags & IRTF_INUSE) == 0)
break;
}
if (i != IROUTE_NR)
unused_route= iroute;
}
else
{
/* Try to track down any old routes, and look for an
* unused one.
*/
for(i= 0, iroute= iroute_table; i<IROUTE_NR; i++, iroute++)
{
if ((iroute->irt_flags & IRTF_INUSE) == 0)
{
unused_route= iroute;
continue;
}
if ((iroute->irt_flags & IRTF_STATIC) != 0)
continue;
if (iroute->irt_port != port_nr ||
iroute->irt_dest != dest ||
iroute->irt_subnetmask != subnetmask ||
iroute->irt_gateway != gateway)
{
continue;
}
break;
}
if (i != IROUTE_NR)
unused_route= iroute;
}
if (unused_route == NULL)
return ENOMEM;
iroute= unused_route;
iroute->irt_port= port_nr;
iroute->irt_dest= dest;
iroute->irt_subnetmask= subnetmask;
iroute->irt_gateway= gateway;
iroute->irt_dist= dist;
iroute->irt_mtu= mtu;
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iroute->irt_flags= IRTF_INUSE;
if (static_route)
iroute->irt_flags |= IRTF_STATIC;
iroute_uncache_nw(iroute->irt_dest, iroute->irt_subnetmask);
if (iroute_p != NULL)
*iroute_p= iroute;
return NW_OK;
}
PUBLIC int ipr_del_iroute(port_nr, dest, subnetmask, gateway, static_route)
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int port_nr;
ipaddr_t dest;
ipaddr_t subnetmask;
ipaddr_t gateway;
int static_route;
{
int i;
iroute_t *iroute;
/* Try to track down any old routes, and look for an
* unused one.
*/
for(i= 0, iroute= iroute_table; i<IROUTE_NR; i++, iroute++)
{
if ((iroute->irt_flags & IRTF_INUSE) == 0)
continue;
if (iroute->irt_port != port_nr ||
iroute->irt_dest != dest ||
iroute->irt_subnetmask != subnetmask ||
iroute->irt_gateway != gateway)
{
continue;
}
if (!!(iroute->irt_flags & IRTF_STATIC) != static_route)
continue;
break;
}
if (i == IROUTE_NR)
return ESRCH;
iroute_uncache_nw(iroute->irt_dest, iroute->irt_subnetmask);
iroute->irt_flags= IRTF_EMPTY;
return NW_OK;
}
PUBLIC void ipr_chk_itab(port_nr, addr, mask)
int port_nr;
ipaddr_t addr;
ipaddr_t mask;
{
int i;
iroute_t *iroute;
DBLOCK(1,
printf("ip[%d] (ipr_chk_itab): addr ", port_nr);
writeIpAddr(addr);
printf(" mask ");
writeIpAddr(mask);
printf("\n");
);
if (addr == 0)
{
/* Special hack to flush entries for an interface that
* goes down.
*/
addr= mask= HTONL(0xffffffff);
}
for(i= 0, iroute= iroute_table; i<IROUTE_NR; i++, iroute++)
{
if ((iroute->irt_flags & IRTF_INUSE) == 0)
continue;
if (iroute->irt_port != port_nr)
continue;
if (iroute->irt_gateway == 0)
{
/* Special case: attached network. */
if (iroute->irt_subnetmask == mask &&
iroute->irt_dest == (addr & mask))
{
/* Nothing changed. */
continue;
}
}
if (((iroute->irt_gateway ^ addr) & mask) == 0)
continue;
DBLOCK(1, printf("ip[%d] (ipr_chk_itab): deleting route to ",
port_nr);
writeIpAddr(iroute->irt_dest);
printf(" gw ");
writeIpAddr(iroute->irt_gateway);
printf("\n"));
iroute_uncache_nw(iroute->irt_dest, iroute->irt_subnetmask);
iroute->irt_flags &= ~IRTF_INUSE;
}
}
PRIVATE void iroute_uncache_nw(dest, netmask)
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ipaddr_t dest;
ipaddr_t netmask;
{
int i, j;
iroute_hash_t *iroute_hash;
for (i= 0, iroute_hash= &iroute_hash_table[0][0];
i<IROUTE_HASH_NR; i++, iroute_hash += IROUTE_HASH_ASS_NR)
{
for (j= 0; j<IROUTE_HASH_ASS_NR; j++)
{
if (((iroute_hash[j].irh_addr ^ dest) &
netmask) == 0)
{
iroute_hash[j].irh_addr= 0;
iroute_hash[j].irh_route= NULL;
}
}
}
}
/*
* $PchId: ipr.c,v 1.23 2003/01/22 11:49:58 philip Exp $
2005-04-21 16:53:53 +02:00
*/