install correct aliases file

[unix-history] / usr / src / sys / net / route.c

diff --git a/usr/src/sys/net/route.c b/usr/src/sys/net/route.c
index 06be927..4d898a4 100644 (file)
--- a/usr/src/sys/net/route.c
+++ b/usr/src/sys/net/route.c
@@ -1,184 +1,384 @@
-/*     route.c 4.7     82/05/04        */
-
-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/mbuf.h"
-#include "../h/protosw.h"
-#include "../h/socket.h"
-#include "../h/ioctl.h"
-#include "../net/in.h"
-#include "../net/in_systm.h"
-#include "../net/if.h"
-#include "../net/af.h"
-#include "../net/route.h"
-#include <errno.h>
+/*
+ * Copyright (c) 1980, 1986 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *     @(#)route.c     7.7 (Berkeley) %G%
+ */
+
+#include "param.h"
+#include "systm.h"
+#include "mbuf.h"
+#include "protosw.h"
+#include "socket.h"
+#include "dir.h"
+#include "user.h"
+#include "ioctl.h"
+#include "errno.h"
+
+#include "if.h"
+#include "af.h"
+#include "route.h"
+#include "radix.h"
+
+#include "radix.c"
+#ifdef INET
+#include "../netinet/in.h"
+#include "../netinet/in_var.h"
+#endif
+
+int    rttrash;                /* routes not in table but not freed */
+struct sockaddr wildcard;      /* zero valued cookie for wildcard searches */
+int    rthashsize = RTHASHSIZ; /* for netstat, etc. */
+
+static int rtinits_done = 0;
+struct radix_node_head *ns_rnhead, *in_rnhead;
+rtinitheads()
+{
+       if (rtinits_done == 0 &&
+           rn_inithead(&ns_rnhead, 16, AF_NS) &&
+           rn_inithead(&in_rnhead, 32, AF_INET))
+               rtinits_done = 1;
+}

 
 /*
  * Packet routing routines.
  */
 
 /*
  * Packet routing routines.
  */

-

 rtalloc(ro)
        register struct route *ro;
 {
 rtalloc(ro)
        register struct route *ro;
 {

-       register struct rtentry *rt, *rtmin;
-       register struct mbuf *m;
-       register int hash, (*match)();
-       struct afhash h;
-       struct sockaddr *dst = &ro->ro_dst;
-       int af = dst->sa_family;
-
-COUNT(RTALLOC);
-       if (ro->ro_rt && ro->ro_rt->rt_ifp)                     /* XXX */
-               return;
-       if (af >= AF_MAX)
-               return;
-       (*afswitch[af].af_hash)(dst, &h);
-       rtmin = 0, hash = h.afh_hosthash;
-       for (m = rthost[hash % RTHASHSIZ]; m; m = m->m_next) {
-               rt = mtod(m, struct rtentry *);
-               if (rt->rt_hash != hash)
-                       continue;
-               if (bcmp((caddr_t)&rt->rt_dst, (caddr_t)dst, sizeof (*dst)))
-                       continue;
-               if (rtmin == 0 || rt->rt_use < rtmin->rt_use)
-                       rtmin = rt;
-       }
-       if (rtmin) 
-               goto found;
-
-       hash = h.afh_nethash;
-       match = afswitch[af].af_netmatch;
-       for (m = rtnet[hash % RTHASHSIZ]; m; m = m->m_next) {
-               rt = mtod(m, struct rtentry *);
-               if (rt->rt_hash != hash)
-                       continue;
-               if (rt->rt_dst.sa_family != af || !(*match)(&rt->rt_dst, dst))
-                       continue;
-               if (rtmin == 0 || rt->rt_use < rtmin->rt_use)
-                       rtmin = rt;
-       }
-found:
-       ro->ro_rt = rtmin;
-       if (rtmin)
-               rtmin->rt_refcnt++;
+       register struct radix_node_head *rnh;
+       register struct radix_node *rn;
+       register struct rtentry *rt = 0;
+       u_char af = ro->ro_dst.sa_family;
+       int  s;
+
+       if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP))
+               return;                          /* XXX */
+       s = splnet();
+       for (rnh = radix_node_head; rnh && (af != rnh->rnh_af); )
+               rnh = rnh->rnh_next;
+       if (rnh && rnh->rnh_treetop &&
+           (rn = rn_match((char *)&(ro->ro_dst), rnh->rnh_treetop)) &&
+           ((rn->rn_flags & RNF_ROOT) == 0)) {
+               rt = &(((struct nrtentry *)rn)->nrt_rt);
+               rt->rt_refcnt++;
+       } else
+               rtstat.rts_unreach++;
+       ro->ro_rt = rt;
+       splx(s);

 }
 
 rtfree(rt)
        register struct rtentry *rt;
 {
 }
 
 rtfree(rt)
        register struct rtentry *rt;
 {

-
+       register struct nrtentry *nrt;
+       u_char *af;

        if (rt == 0)
        if (rt == 0)

-               panic("freeroute");
+               panic("rtfree");

        rt->rt_refcnt--;
        rt->rt_refcnt--;

-       /* on refcnt == 0 reclaim? notify someone? */
+       if (rt->rt_refcnt <= 0 && (rt->rt_flags&RTF_UP) == 0) {
+               rttrash--;
+               nrt = (struct nrtentry *) (((struct radix_node *)rt) - 2);
+               if (nrt->nrt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT))
+                       panic ("rtfree 2");
+               free((caddr_t)nrt, M_RTABLE);
+       }

 }
 
 }
 

-#define        equal(a1, a2) \
-       (bcmp((caddr_t)(a1), (caddr_t)(a2), sizeof (struct sockaddr)) == 0)

 /*
 /*

- * Carry out a request to change the routing table.  Called by
- * interfaces at boot time to make their ``local routes'' known
- * and for ioctl's.
+ * Force a routing table entry to the specified
+ * destination to go through the given gateway.
+ * Normally called as a result of a routing redirect
+ * message from the network layer.
+ *
+ * N.B.: must be called at splnet
+ *

  */
  */

-rtrequest(req, new)
-       int req;
-       register struct rtentry *new;
+rtredirect(dst, gateway, flags, src)
+       struct sockaddr *dst, *gateway, *src;
+       int flags;

 {
 {

+       struct route ro;

        register struct rtentry *rt;
        register struct rtentry *rt;

-       register struct mbuf *m, **mprev;
-       register int hash, (*match)();
-       register struct sockaddr *sa = &new->rt_dst;
-       register struct sockaddr *gate = &new->rt_gateway;
-       struct afhash h;
-       struct mbuf **oldmprev;
-       int af = sa->sa_family, doinghost, s, error = 0;
-
-COUNT(RTREQUEST);
-       if (af >= AF_MAX)
-               return (EAFNOSUPPORT);
-       (*afswitch[af].af_hash)(sa, &h);
-       hash = h.afh_hosthash;
-       mprev = &rthost[hash % RTHASHSIZ];
-       doinghost = 1;
-       s = splimp();
-again:
-       for (; m = *mprev; mprev = &m->m_next) {
-               rt = mtod(m, struct rtentry *);
-               if (rt->rt_hash != hash)
-                       continue;
-               if (doinghost) {
-                       if (!equal(&rt->rt_dst, sa))
-                               continue;
+
+       /* verify the gateway is directly reachable */
+       if (ifa_ifwithnet(gateway) == 0) {
+               rtstat.rts_badredirect++;
+               return;
+       }
+       ro.ro_dst = *dst;
+       ro.ro_rt = 0;
+       rtalloc(&ro);
+       rt = ro.ro_rt;
+#define        equal(a1, a2) \
+  (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
+       /*
+        * If the redirect isn't from our current router for this dst,
+        * it's either old or wrong.  If it redirects us to ourselves,
+        * we have a routing loop, perhaps as a result of an interface
+        * going down recently.
+        */
+       if ((rt && !equal(src, &rt->rt_gateway)) || ifa_ifwithaddr(gateway)) {
+               rtstat.rts_badredirect++;
+               if (rt)
+                       rtfree(rt);
+               return;
+       }
+       /*
+        * Old comment:
+        * Create a new entry if we just got back a wildcard entry
+        * or the the lookup failed.  This is necessary for hosts
+        * which use routing redirects generated by smart gateways
+        * to dynamically build the routing tables.
+        *
+        * New comment:
+        * If we survived the previous tests, it doesn't matter
+        * what sort of entry we got when we looked it up;
+        * we should just go ahead and free the reference to
+        * the route we created.  rtalloc will not give a
+        * pointer to the root node.  And if we got a pointer
+        * to a default gateway, we should free the reference
+        * in any case.
+       if (rt) {
+               rtfree(rt);
+               rt = 0;
+       }
+        */
+       if (rt == 0) {
+               rtinit(dst, gateway, (int)SIOCADDRT,
+                   (flags & RTF_HOST) | RTF_GATEWAY | RTF_DYNAMIC);
+               rtstat.rts_dynamic++;
+               return;
+       }
+       /*
+        * Don't listen to the redirect if it's
+        * for a route to an interface. 
+        */
+       if (rt->rt_flags & RTF_GATEWAY) {
+               if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
+                       /*
+                        * Changing from route to net => route to host.
+                        * Create new route, rather than smashing route to net.
+                        */
+                       rtinit(dst, gateway, (int)SIOCADDRT,
+                           flags | RTF_DYNAMIC);
+                       rtstat.rts_dynamic++;

                } else {
                } else {

-                       if (rt->rt_dst.sa_family != sa->sa_family ||
-                           (*match)(&rt->rt_dst, sa) == 0)
-                               continue;
+                       /*
+                        * Smash the current notion of the gateway to
+                        * this destination.
+                        */
+                       rt->rt_gateway = *gateway; /*XXX -- size? */
+                       rt->rt_flags |= RTF_MODIFIED;
+                       rtstat.rts_newgateway++;

                }
                }

-               /* require full match on deletions */
-               if (req == SIOCDELRT && !equal(&rt->rt_gateway, gate))
-                       continue;
-               /* don't keep multiple identical entries */
-               if (req == SIOCADDRT && equal(&rt->rt_gateway, gate)) {
-                       error = EEXIST;
-                       goto bad;
+       } else
+               rtstat.rts_badredirect++;
+       rtfree(rt);
+}
+
+/*
+ * Routing table ioctl interface.
+ */
+rtioctl(cmd, data)
+       int cmd;
+       caddr_t data;
+{
+
+       if (cmd != SIOCADDRT && cmd != SIOCDELRT)
+               return (EINVAL);
+       if (!suser())
+               return (u.u_error);
+       return (rtrequest(cmd, (struct rtentry *)data));
+}
+/*
+ * This routine will go away soon.
+ * Tries to guess which netmask is appropriate for a given net.
+ */
+static struct sockaddr_in rtgmask = { 8, 0 };
+
+char *
+rtgetmask(sa, ifa)
+register struct sockaddr *sa;
+register struct ifaddr *ifa;
+{
+       u_long i, net, mask, subnet;
+
+       switch (sa->sa_family) {
+#ifdef INET
+       register struct in_ifaddr *ia;
+
+       case AF_INET:
+
+               i = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr);
+               if (i == 0) {
+                       rtgmask.sin_addr.s_addr = 0;
+                       return ((char *)&rtgmask);
+               } else if (IN_CLASSA(i)) {
+                       net = i & IN_CLASSA_NET;
+                       mask = IN_CLASSA_NET;
+               } else if (IN_CLASSB(i)) {
+                       net = i & IN_CLASSB_NET;
+                       mask = IN_CLASSB_NET;
+               } else if (IN_CLASSC(i)) {
+                       net = i & IN_CLASSC_NET;
+                       mask = IN_CLASSC_NET;
+               } else {
+                       net = i;
+                       mask = 0xffffffff;

                }
                }

-               break;
-       }
-       if (m == 0 && doinghost) {
-               hash = h.afh_nethash;
-               oldmprev = mprev;
-               mprev = &rtnet[hash % RTHASHSIZ];
-               match = afswitch[af].af_netmatch;
-               doinghost = 0;
-               goto again;
+
+               /*
+                * Check whether network is a subnet;
+                * if so, return subnet number.
+                */
+               for (ia = in_ifaddr; ia; ia = ia->ia_next)
+                       if (net == ia->ia_net) {
+                               ifa = &ia->ia_ifa;
+                               break;
+                       }
+               if (ia == 0) {
+                       rtgmask.sin_addr.s_addr = ntohl(mask);
+                       return ((char *)&rtgmask);
+               }
+#endif

        }
        }

+       return ((char *)ifa->ifa_netmask);
+}

 
 

-       if (m == 0 && req != SIOCADDRT) {
+/*
+ * Carry out a request to change the routing table.  Called by
+ * interfaces at boot time to make their ``local routes'' known,
+ * for ioctl's, and as the result of routing redirects.
+ */
+rtrequest(req, entry)
+       int req;
+       register struct rtentry *entry;
+{
+       register struct rtentry *rt;
+       int s, error = 0, found;
+       u_char af;
+       struct ifaddr *ifa;
+       struct ifaddr *ifa_ifwithdstaddr();
+       register struct nrtentry *nrt;
+       register struct radix_node *rn;
+       register struct radix_node_head *rnh;
+       struct radix_node *head;
+       char *netmask;
+
+#ifdef COMPAT_43
+#if BYTE_ORDER != BIG_ENDIAN
+       s = splnet();
+       if (entry->rt_dst.sa_family == 0 && entry->rt_dst.sa_len < 16) {
+               entry->rt_dst.sa_family = entry->rt_dst.sa_len;
+               entry->rt_dst.sa_len = 16;
+       }
+       if (entry->rt_gateway.sa_family == 0 && entry->rt_gateway.sa_len < 16) {
+               entry->rt_gateway.sa_family = entry->rt_gateway.sa_len;
+               entry->rt_gateway.sa_len = 16;
+       }
+#else
+       if (entry->rt_dst.sa_len == 0)
+               entry->rt_dst.sa_len = 16;
+       if (entry->rt_gateway.sa_len == 0)
+               entry->rt_gateway.sa_len = 16;
+#endif
+#endif
+       if (rtinits_done == 0)
+               rtinitheads();
+       af = entry->rt_dst.sa_family;
+       for (rnh = radix_node_head; rnh && (af != rnh->rnh_af); )
+               rnh = rnh->rnh_next;
+       if (rnh == 0) {

                error = ESRCH;
                goto bad;
        }
                error = ESRCH;
                goto bad;
        }

-found:
+       head = rnh->rnh_treetop;
+       if ((entry->rt_flags & RTF_GATEWAY) == 0) {
+               /*
+                * If we are adding a route to an interface,
+                * and the interface is a pt to pt link
+                * we should search for the destination
+                * as our clue to the interface.  Otherwise
+                * we can use the local address.
+                */
+               ifa = 0;
+               if (entry->rt_flags & RTF_HOST) 
+                       ifa = ifa_ifwithdstaddr(&entry->rt_dst);
+               if (ifa == 0)
+                       ifa = ifa_ifwithaddr(&entry->rt_gateway);
+       } else {
+               /*
+                * If we are adding a route to a remote net
+                * or host, the gateway may still be on the
+                * other end of a pt to pt link.
+                */
+               ifa = ifa_ifwithdstaddr(&entry->rt_gateway);
+       }
+       if (ifa == 0) {
+               ifa = ifa_ifwithnet(&entry->rt_gateway);
+               if (ifa == 0 && req == SIOCADDRT) {
+                       error = ENETUNREACH;
+                       goto bad;
+               }
+       }
+       if (entry->rt_flags & RTF_HOST)
+               netmask = 0;
+       else
+               netmask = rtgetmask(&entry->rt_dst, ifa);

        switch (req) {
 
        case SIOCDELRT:
        switch (req) {
 
        case SIOCDELRT:

-               rt->rt_flags &= ~RTF_UP;
-               if (rt->rt_refcnt > 0)  /* should we notify protocols? */
-                       error = EBUSY;
-               else
-                       *mprev = m_free(m);
-               break;
-
-       case SIOCCHGRT:
-               rt->rt_flags = new->rt_flags;
-               if (rt->rt_refcnt > 0)
-                       error = EBUSY;
-               else if (!equal(&rt->rt_gateway, gate))
-                       goto newneighbor;
+               if ((rn = rn_delete((char *)&entry->rt_dst,
+                                       netmask, head)) == 0) {
+                       error = ESRCH;
+                       goto bad;
+               }
+               if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
+                       panic ("rtrequest delete");
+               nrt = (struct nrtentry *)rn;
+               nrt->nrt_rt.rt_flags &= ~RTF_UP;
+               if (nrt->nrt_rt.rt_refcnt > 0)
+                       rttrash++;
+               else 
+                       free((caddr_t)nrt, M_RTABLE);

                break;
 
        case SIOCADDRT:
                break;
 
        case SIOCADDRT:

-               m = m_get(M_DONTWAIT);
-               if (m == 0) {
+               Malloc(nrt, struct nrtentry *, sizeof *nrt);
+               if (nrt == 0) {

                        error = ENOBUFS;
                        error = ENOBUFS;

-                       break;
+                       goto bad;

                }
                }

-               m->m_off = MMINOFF;
-               m->m_len = sizeof (struct rtentry);
-               rt = mtod(m, struct rtentry *);
-               *rt = *new;
-               if (new->rt_flags & RTF_HOST) {
-                       rt->rt_hash = h.afh_hosthash;
-                       *oldmprev = m;
-               } else {
-                       rt->rt_hash = h.afh_nethash;
-                       *mprev = m;
+               Bzero(nrt, sizeof *nrt);
+               rn = rn_addroute((char *)&entry->rt_dst, netmask,
+                                                   head, nrt->nrt_nodes);
+               if (rn == 0) {
+                       free((caddr_t)nrt, M_RTABLE);
+                       error = EEXIST;
+                       goto bad;

                }
                }

+               rt = &nrt->nrt_rt;
+               rn->rn_key = (char *)&(nrt->nrt_rt.rt_dst);
+               rt->rt_dst = entry->rt_dst;
+               rt->rt_gateway = entry->rt_gateway;
+               rt->rt_flags = RTF_UP |
+                   (entry->rt_flags & (RTF_HOST|RTF_GATEWAY|RTF_DYNAMIC));

                rt->rt_use = 0;
                rt->rt_refcnt = 0;
                rt->rt_use = 0;
                rt->rt_refcnt = 0;

-newneighbor:
-               rt->rt_ifp = if_ifwithnet(gate);
-               if (rt->rt_ifp == 0)
-                       rt->rt_flags &= ~RTF_UP;
+               rt->rt_ifp = ifa->ifa_ifp;

                break;
        }
 bad:
                break;
        }
 bad:


@@ -190,19 +390,15 @@ bad:
  * Set up a routing table entry, normally
  * for an interface.
  */
  * Set up a routing table entry, normally
  * for an interface.
  */

-rtinit(dst, gateway, flags)
+rtinit(dst, gateway, cmd, flags)

        struct sockaddr *dst, *gateway;
        struct sockaddr *dst, *gateway;

-       int flags;
+       int cmd, flags;

 {
        struct rtentry route;
 {
        struct rtentry route;

-       struct route ro;

 
 

+       bzero((caddr_t)&route, sizeof (route));

        route.rt_dst = *dst;
        route.rt_gateway = *gateway;
        route.rt_flags = flags;
        route.rt_dst = *dst;
        route.rt_gateway = *gateway;
        route.rt_flags = flags;

-       route.rt_use = 0;
-       (void) rtrequest(SIOCADDRT, &route);
-       ro.ro_rt = 0;
-       ro.ro_dst = *dst;
-       rtalloc(&ro);
+       (void) rtrequest(cmd, &route);

 }
 }