1247 lines
27 KiB
C
1247 lines
27 KiB
C
/*
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ipr.c
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Copyright 1995 Philip Homburg
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*/
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#include "inet.h"
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#include "clock.h"
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#include "type.h"
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#include "assert.h"
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#include "buf.h"
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#include "event.h"
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#include "io.h"
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#include "ip_int.h"
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#include "ipr.h"
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THIS_FILE
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#define OROUTE_NR 128
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#define OROUTE_STATIC_NR 16
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#define OROUTE_HASH_ASS_NR 4
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#define OROUTE_HASH_NR 32
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#define OROUTE_HASH_MASK (OROUTE_HASH_NR-1)
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#define hash_oroute(port_nr, ipaddr, hash_tmp) (hash_tmp= (ipaddr), \
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hash_tmp= (hash_tmp >> 20) ^ hash_tmp, \
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hash_tmp= (hash_tmp >> 10) ^ hash_tmp, \
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hash_tmp= (hash_tmp >> 5) ^ hash_tmp, \
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(hash_tmp + (port_nr)) & OROUTE_HASH_MASK)
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typedef struct oroute_hash
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{
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ipaddr_t orh_addr;
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oroute_t *orh_route;
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} oroute_hash_t;
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PRIVATE oroute_t oroute_table[OROUTE_NR];
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PRIVATE oroute_t *oroute_head;
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PRIVATE int static_oroute_nr;
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PRIVATE oroute_hash_t oroute_hash_table[OROUTE_HASH_NR][OROUTE_HASH_ASS_NR];
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#define IROUTE_NR 512
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#define IROUTE_HASH_ASS_NR 4
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#define IROUTE_HASH_NR 32
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#define IROUTE_HASH_MASK (IROUTE_HASH_NR-1)
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#define hash_iroute(port_nr, ipaddr, hash_tmp) (hash_tmp= (ipaddr), \
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hash_tmp= (hash_tmp >> 20) ^ hash_tmp, \
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hash_tmp= (hash_tmp >> 10) ^ hash_tmp, \
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hash_tmp= (hash_tmp >> 5) ^ hash_tmp, \
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(hash_tmp + (port_nr)) & IROUTE_HASH_MASK)
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typedef struct iroute_hash
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{
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ipaddr_t irh_addr;
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iroute_t *irh_route;
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} iroute_hash_t;
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PRIVATE iroute_t iroute_table[IROUTE_NR];
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PRIVATE iroute_hash_t iroute_hash_table[IROUTE_HASH_NR][IROUTE_HASH_ASS_NR];
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FORWARD oroute_t *oroute_find_ent ARGS(( int port_nr, ipaddr_t dest ));
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FORWARD void oroute_del ARGS(( oroute_t *oroute ));
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FORWARD oroute_t *sort_dists ARGS(( oroute_t *oroute ));
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FORWARD oroute_t *sort_gws ARGS(( oroute_t *oroute ));
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FORWARD void oroute_uncache_nw ARGS(( ipaddr_t dest, ipaddr_t netmask ));
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FORWARD void iroute_uncache_nw ARGS(( ipaddr_t dest, ipaddr_t netmask ));
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PUBLIC void ipr_init()
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{
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int i;
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oroute_t *oroute;
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iroute_t *iroute;
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for (i= 0, oroute= oroute_table; i<OROUTE_NR; i++, oroute++)
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oroute->ort_flags= ORTF_EMPTY;
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static_oroute_nr= 0;
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assert(OROUTE_HASH_ASS_NR == 4);
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for (i= 0, iroute= iroute_table; i<IROUTE_NR; i++, iroute++)
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iroute->irt_flags= IRTF_EMPTY;
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assert(IROUTE_HASH_ASS_NR == 4);
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}
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PUBLIC iroute_t *iroute_frag(port_nr, dest)
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int port_nr;
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ipaddr_t dest;
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{
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int hash, i;
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iroute_hash_t *iroute_hash;
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iroute_hash_t tmp_hash;
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iroute_t *iroute, *bestroute;
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unsigned long hash_tmp;
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u32_t tmp_mask;
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hash= hash_iroute(port_nr, dest, hash_tmp);
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iroute_hash= &iroute_hash_table[hash][0];
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if (iroute_hash[0].irh_addr == dest)
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iroute= iroute_hash[0].irh_route;
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else if (iroute_hash[1].irh_addr == dest)
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{
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tmp_hash= iroute_hash[1];
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iroute_hash[1]= iroute_hash[0];
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iroute_hash[0]= tmp_hash;
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iroute= tmp_hash.irh_route;
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}
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else if (iroute_hash[2].irh_addr == dest)
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{
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tmp_hash= iroute_hash[2];
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iroute_hash[2]= iroute_hash[1];
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iroute_hash[1]= iroute_hash[0];
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iroute_hash[0]= tmp_hash;
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iroute= tmp_hash.irh_route;
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}
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else if (iroute_hash[3].irh_addr == dest)
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{
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tmp_hash= iroute_hash[3];
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iroute_hash[3]= iroute_hash[2];
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iroute_hash[2]= iroute_hash[1];
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iroute_hash[1]= iroute_hash[0];
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iroute_hash[0]= tmp_hash;
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iroute= tmp_hash.irh_route;
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}
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else
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iroute= NULL;
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if (iroute)
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return iroute;
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bestroute= NULL;
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for (i= 0, iroute= iroute_table; i < IROUTE_NR; i++, iroute++)
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{
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if (!(iroute->irt_flags & IRTF_INUSE))
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continue;
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if (((dest ^ iroute->irt_dest) & iroute->irt_subnetmask) != 0)
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continue;
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if (!bestroute)
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{
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bestroute= iroute;
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continue;
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}
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/* More specific netmasks are better */
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if (iroute->irt_subnetmask != bestroute->irt_subnetmask)
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{
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/* Using two ntohl macros in one expression
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* is not allowed (tmp_l is modified twice)
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*/
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tmp_mask= ntohl(iroute->irt_subnetmask);
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if (tmp_mask > ntohl(bestroute->irt_subnetmask))
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bestroute= iroute;
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continue;
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}
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/* Dynamic routes override static routes */
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if ((iroute->irt_flags & IRTF_STATIC) !=
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(bestroute->irt_flags & IRTF_STATIC))
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{
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if (bestroute->irt_flags & IRTF_STATIC)
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bestroute= iroute;
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continue;
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}
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/* A route to the local interface give an opportunity
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* to send redirects.
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*/
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if (iroute->irt_port != bestroute->irt_port)
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{
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if (iroute->irt_port == port_nr)
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bestroute= iroute;
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continue;
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}
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}
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if (bestroute == NULL)
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return NULL;
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iroute_hash[3]= iroute_hash[2];
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iroute_hash[2]= iroute_hash[1];
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iroute_hash[1]= iroute_hash[0];
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iroute_hash[0].irh_addr= dest;
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iroute_hash[0].irh_route= bestroute;
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return bestroute;
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}
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PUBLIC int oroute_frag(port_nr, dest, ttl, msgsize, nexthop)
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int port_nr;
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ipaddr_t dest;
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int ttl;
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size_t msgsize;
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ipaddr_t *nexthop;
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{
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oroute_t *oroute;
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oroute= oroute_find_ent(port_nr, dest);
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if (!oroute || oroute->ort_dist > ttl)
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return ENETUNREACH;
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if (msgsize && oroute->ort_mtu &&
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oroute->ort_mtu < msgsize)
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{
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return EPACKSIZE;
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}
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*nexthop= oroute->ort_gateway;
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return NW_OK;
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}
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PUBLIC int ipr_add_oroute(port_nr, dest, subnetmask, gateway,
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timeout, dist, mtu, static_route, preference, oroute_p)
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int port_nr;
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ipaddr_t dest;
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ipaddr_t subnetmask;
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ipaddr_t gateway;
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time_t timeout;
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int dist;
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int mtu;
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int static_route;
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i32_t preference;
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oroute_t **oroute_p;
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{
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int i;
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ip_port_t *ip_port;
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oroute_t *oroute, *oldest_route, *prev, *nw_route, *gw_route,
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*prev_route;
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time_t currtim, exp_tim, exp_tim_orig;
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oldest_route= 0;
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currtim= get_time();
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if (timeout)
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exp_tim= timeout+currtim;
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else
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exp_tim= 0;
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DBLOCK(0x10,
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printf("ip[%d]: adding oroute to ", port_nr);
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writeIpAddr(dest);
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printf("["); writeIpAddr(subnetmask); printf("] through ");
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writeIpAddr(gateway);
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printf(" timeout: %lds, distance %d, pref %ld, mtu %d\n",
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(long)timeout/HZ, dist, (long)preference, mtu));
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ip_port= &ip_port_table[port_nr];
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/* Validate gateway */
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if (((gateway ^ ip_port->ip_ipaddr) & ip_port->ip_subnetmask) != 0)
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{
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DBLOCK(1, printf("ip[%d]: (ipr_add_oroute) invalid gateway: ",
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port_nr); writeIpAddr(gateway); printf("\n"));
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return EINVAL;
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}
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if (static_route)
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{
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if (static_oroute_nr >= OROUTE_STATIC_NR)
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return ENOMEM;
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static_oroute_nr++;
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}
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else
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{
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/* Try to track down any old routes. */
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for(oroute= oroute_head; oroute; oroute= oroute->ort_nextnw)
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{
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if (oroute->ort_port != port_nr)
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continue;
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if (oroute->ort_dest == dest &&
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oroute->ort_subnetmask == subnetmask)
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{
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break;
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}
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}
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for(; oroute; oroute= oroute->ort_nextgw)
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{
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if (oroute->ort_gateway == gateway)
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break;
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}
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for(; oroute; oroute= oroute->ort_nextdist)
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{
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if ((oroute->ort_flags & ORTF_STATIC) != 0)
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continue;
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if (oroute->ort_dist > dist)
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continue;
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break;
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}
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if (oroute)
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{
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assert(oroute->ort_port == port_nr);
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if (dest != 0)
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{
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/* The new expire should not be later
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* than the old expire time. Except for
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* default routes, where the expire time
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* is simple set to the new value.
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*/
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exp_tim_orig= oroute->ort_exp_tim;
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if (!exp_tim)
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exp_tim= exp_tim_orig;
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else if (exp_tim_orig &&
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exp_tim > exp_tim_orig)
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{
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exp_tim= exp_tim_orig;
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}
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}
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oroute_del(oroute);
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oroute->ort_flags= 0;
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oldest_route= oroute;
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}
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}
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if (oldest_route == NULL)
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{
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/* Look for an unused entry, or remove an existing one */
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for (i= 0, oroute= oroute_table; i<OROUTE_NR; i++, oroute++)
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{
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if ((oroute->ort_flags & ORTF_INUSE) == 0)
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break;
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if (oroute->ort_exp_tim && oroute->ort_exp_tim <
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currtim)
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{
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oroute_del(oroute);
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oroute->ort_flags= 0;
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break;
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}
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if (oroute->ort_flags & ORTF_STATIC)
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continue;
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if (oroute->ort_dest == 0)
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{
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/* Never remove default routes. */
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continue;
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}
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if (oldest_route == NULL)
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{
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oldest_route= oroute;
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continue;
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}
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if (oroute->ort_timestamp < oldest_route->ort_timestamp)
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{
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oldest_route= oroute;
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}
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}
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if (i < OROUTE_NR)
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oldest_route= oroute;
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else
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{
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assert(oldest_route);
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oroute_del(oldest_route);
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oldest_route->ort_flags= 0;
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}
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}
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oldest_route->ort_dest= dest;
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oldest_route->ort_gateway= gateway;
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oldest_route->ort_subnetmask= subnetmask;
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oldest_route->ort_exp_tim= exp_tim;
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oldest_route->ort_timestamp= currtim;
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oldest_route->ort_dist= dist;
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oldest_route->ort_mtu= mtu;
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oldest_route->ort_port= port_nr;
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oldest_route->ort_flags= ORTF_INUSE;
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oldest_route->ort_pref= preference;
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if (static_route)
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oldest_route->ort_flags |= ORTF_STATIC;
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/* Insert the route by tearing apart the routing table,
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* and insert the entry during the reconstruction.
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*/
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for (prev= 0, nw_route= oroute_head; nw_route;
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prev= nw_route, nw_route= nw_route->ort_nextnw)
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{
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if (nw_route->ort_port != port_nr)
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continue;
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if (nw_route->ort_dest == dest &&
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nw_route->ort_subnetmask == subnetmask)
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{
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if (prev)
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prev->ort_nextnw= nw_route->ort_nextnw;
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else
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oroute_head= nw_route->ort_nextnw;
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break;
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}
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}
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prev_route= nw_route;
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for(prev= NULL, gw_route= nw_route; gw_route;
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prev= gw_route, gw_route= gw_route->ort_nextgw)
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{
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if (gw_route->ort_gateway == gateway)
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{
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if (prev)
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prev->ort_nextgw= gw_route->ort_nextgw;
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else
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nw_route= gw_route->ort_nextgw;
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break;
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}
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}
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oldest_route->ort_nextdist= gw_route;
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gw_route= oldest_route;
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gw_route= sort_dists(gw_route);
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gw_route->ort_nextgw= nw_route;
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nw_route= gw_route;
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nw_route= sort_gws(nw_route);
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nw_route->ort_nextnw= oroute_head;
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oroute_head= nw_route;
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if (nw_route != prev_route)
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oroute_uncache_nw(nw_route->ort_dest, nw_route->ort_subnetmask);
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if (oroute_p != NULL)
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*oroute_p= oldest_route;
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return NW_OK;
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}
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PUBLIC int ipr_del_oroute(port_nr, dest, subnetmask, gateway, static_route)
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int port_nr;
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ipaddr_t dest;
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ipaddr_t subnetmask;
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ipaddr_t gateway;
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int static_route;
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{
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int i;
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oroute_t *oroute;
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for(i= 0, oroute= oroute_table; i<OROUTE_NR; i++, oroute++)
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{
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if ((oroute->ort_flags & ORTF_INUSE) == 0)
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continue;
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if (oroute->ort_port != port_nr ||
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oroute->ort_dest != dest ||
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oroute->ort_subnetmask != subnetmask ||
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oroute->ort_gateway != gateway)
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{
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continue;
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}
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if (!!(oroute->ort_flags & ORTF_STATIC) != static_route)
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continue;
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break;
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}
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if (i == OROUTE_NR)
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return ESRCH;
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if (static_route)
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static_oroute_nr--;
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oroute_del(oroute);
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oroute->ort_flags &= ~ORTF_INUSE;
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return NW_OK;
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}
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PUBLIC void ipr_chk_otab(port_nr, addr, mask)
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int port_nr;
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ipaddr_t addr;
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ipaddr_t mask;
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{
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int i;
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oroute_t *oroute;
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DBLOCK(1,
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printf("ip[%d] (ipr_chk_otab): addr ", port_nr);
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writeIpAddr(addr);
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printf(" mask ");
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writeIpAddr(mask);
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printf("\n");
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);
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if (addr == 0)
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{
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/* Special hack to flush entries for an interface that
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* goes down.
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*/
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addr= mask= HTONL(0xffffffff);
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}
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for(i= 0, oroute= oroute_table; i<OROUTE_NR; i++, oroute++)
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{
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if ((oroute->ort_flags & ORTF_INUSE) == 0)
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continue;
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if (oroute->ort_port != port_nr ||
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((oroute->ort_gateway ^ addr) & mask) == 0)
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{
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continue;
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}
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DBLOCK(1, printf("ip[%d] (ipr_chk_otab): deleting route to ",
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port_nr);
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writeIpAddr(oroute->ort_dest);
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printf(" gw ");
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writeIpAddr(oroute->ort_gateway);
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printf("\n"));
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if (oroute->ort_flags & ORTF_STATIC)
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static_oroute_nr--;
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oroute_del(oroute);
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oroute->ort_flags &= ~ORTF_INUSE;
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}
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}
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PUBLIC void ipr_gateway_down(port_nr, gateway, timeout)
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int port_nr;
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ipaddr_t gateway;
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time_t timeout;
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{
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oroute_t *route_ind;
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time_t currtim;
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int i;
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int result;
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currtim= get_time();
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for (i= 0, route_ind= oroute_table; i<OROUTE_NR; i++, route_ind++)
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{
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if (!(route_ind->ort_flags & ORTF_INUSE))
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continue;
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if (route_ind->ort_gateway != gateway)
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continue;
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if (route_ind->ort_exp_tim && route_ind->ort_exp_tim < currtim)
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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);
|
|
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);
|
|
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);
|
|
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;
|
|
int result;
|
|
|
|
ip_port= &ip_port_table[port_nr];
|
|
oroute= oroute_find_ent(port_nr, dest);
|
|
|
|
if (!oroute)
|
|
{
|
|
DBLOCK(1, printf("ip[%d]: got a redirect for ", port_nr);
|
|
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);
|
|
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;
|
|
}
|
|
if (oroute->ort_flags & ORTF_STATIC)
|
|
{
|
|
if (oroute->ort_dest == dest)
|
|
{
|
|
DBLOCK(1, printf("ip[%d]: got a redirect for ",
|
|
port_nr);
|
|
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);
|
|
assert(result == NW_OK);
|
|
}
|
|
result= ipr_add_oroute(port_nr, dest, netmask, new_gateway,
|
|
timeout, 1, oroute->ort_mtu, FALSE, 0, NULL);
|
|
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);
|
|
writeIpAddr(dest); printf("but no route present\n"));
|
|
return;
|
|
}
|
|
|
|
new_dist= oroute->ort_dist * 2;
|
|
if (new_dist > IP_DEF_TTL)
|
|
{
|
|
new_dist= oroute->ort_dist+1;
|
|
if (new_dist >= IP_DEF_TTL)
|
|
{
|
|
DBLOCK(1, printf("ip[%d]: got a ttl exceeded for ",
|
|
port_nr);
|
|
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(
|
|
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);
|
|
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;
|
|
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;
|
|
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;
|
|
|
|
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))
|
|
{
|
|
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));
|
|
|
|
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;
|
|
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;
|
|
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)
|
|
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;
|
|
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;
|
|
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)
|
|
int port_nr;
|
|
ipaddr_t dest;
|
|
ipaddr_t subnetmask;
|
|
ipaddr_t gateway;
|
|
int dist;
|
|
int mtu;
|
|
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;
|
|
}
|
|
|
|
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;
|
|
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)
|
|
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)
|
|
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 $
|
|
*/
|