notice failed opens other than timeout

[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 f9b9e23..9b44703 100644 (file)
--- a/usr/src/sys/net/route.c
+++ b/usr/src/sys/net/route.c
@@ -1,64 +1,86 @@
-/*     route.c 4.6     82/03/31        */
+/*     route.c 6.1     83/07/29        */

 
 #include "../h/param.h"
 #include "../h/systm.h"
 #include "../h/mbuf.h"
 #include "../h/protosw.h"
 #include "../h/socket.h"
 
 #include "../h/param.h"
 #include "../h/systm.h"
 #include "../h/mbuf.h"
 #include "../h/protosw.h"
 #include "../h/socket.h"

+#include "../h/dir.h"
+#include "../h/user.h"

 #include "../h/ioctl.h"
 #include "../h/ioctl.h"

-#include "../net/in.h"
-#include "../net/in_systm.h"
+#include "../h/errno.h"
+

 #include "../net/if.h"
 #include "../net/af.h"
 #include "../net/route.h"
 #include "../net/if.h"
 #include "../net/af.h"
 #include "../net/route.h"

-#include <errno.h>
+
+int    rttrash;                /* routes not in table but not freed */
+struct sockaddr wildcard;      /* zero valued cookie for wildcard searches */

 
 /*
  * 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 rtentry *rt;

        register struct mbuf *m;
        register struct mbuf *m;

-       register int hash, (*match)();
-       struct afhash h;
+       register unsigned hash;

        struct sockaddr *dst = &ro->ro_dst;
        struct sockaddr *dst = &ro->ro_dst;

-       int af = dst->sa_family;
+       int (*match)(), doinghost;
+       struct afhash h;
+       u_int af = dst->sa_family;
+       struct rtentry *rtmin;
+       struct mbuf **table;

 
 

-COUNT(RTALLOC);

        if (ro->ro_rt && ro->ro_rt->rt_ifp)                     /* XXX */
                return;
        if (ro->ro_rt && ro->ro_rt->rt_ifp)                     /* XXX */
                return;

+       if (af >= AF_MAX)
+               return;

        (*afswitch[af].af_hash)(dst, &h);
        (*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;
+       rtmin = 0;

        match = afswitch[af].af_netmatch;
        match = afswitch[af].af_netmatch;

-       for (m = rtnet[hash % RTHASHSIZ]; m; m = m->m_next) {
+       hash = h.afh_hosthash, table = rthost, doinghost = 1;
+again:
+       for (m = table[hash % RTHASHSIZ]; m; m = m->m_next) {

                rt = mtod(m, struct rtentry *);
                if (rt->rt_hash != hash)
                        continue;
                rt = mtod(m, struct rtentry *);
                if (rt->rt_hash != hash)
                        continue;

-               if (rt->rt_dst.sa_family != af || !(*match)(&rt->rt_dst, dst))
+               if ((rt->rt_flags & RTF_UP) == 0 ||
+                   (rt->rt_ifp->if_flags & IFF_UP) == 0)

                        continue;
                        continue;

+               if (doinghost) {
+                       if (bcmp((caddr_t)&rt->rt_dst, (caddr_t)dst,
+                           sizeof (*dst)))
+                               continue;
+               } else {
+                       if (rt->rt_dst.sa_family != af ||
+                           !(*match)(&rt->rt_dst, dst))
+                               continue;
+               }

                if (rtmin == 0 || rt->rt_use < rtmin->rt_use)
                        rtmin = rt;
        }
                if (rtmin == 0 || rt->rt_use < rtmin->rt_use)
                        rtmin = rt;
        }

-found:
+       if (rtmin == 0 && doinghost) {
+               doinghost = 0;
+               hash = h.afh_nethash, table = rtnet;
+               goto again;
+       }
+       /*
+        * Check for wildcard gateway, by convention network 0.
+        */
+       if (rtmin == 0 && dst != &wildcard) {
+               dst = &wildcard, hash = 0;
+               goto again;
+       }

        ro->ro_rt = rtmin;
        ro->ro_rt = rtmin;

-       if (rtmin)
-               rtmin->rt_refcnt++;
+       if (rtmin == 0) {
+               rtstat.rts_unreach++;
+               return;
+       }
+       rtmin->rt_refcnt++;
+       if (dst == &wildcard)
+               rtstat.rts_wildcard++;

 }
 
 rtfree(rt)
 }
 
 rtfree(rt)


@@ -66,115 +88,184 @@ rtfree(rt)
 {
 
        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--;
+               (void) m_free(dtom(rt));
+       }
+}
+
+/*
+ * 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 or higher
+ *
+ * Should notify all parties with a reference to
+ * the route that it's changed (so, for instance,
+ * current round trip time estimates could be flushed),
+ * but we have no back pointers at the moment.
+ */
+rtredirect(dst, gateway)
+       struct sockaddr *dst, *gateway;
+{
+       struct route ro;
+       register struct rtentry *rt;
+
+       /* verify the gateway is directly reachable */
+       if (if_ifwithnet(gateway) == 0) {
+               rtstat.rts_badredirect++;
+               return;
+       }
+       ro.ro_dst = *dst;
+       ro.ro_rt = 0;
+       rtalloc(&ro);
+       rt = ro.ro_rt;
+       /*
+        * 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.
+        */
+       if (rt &&
+           (*afswitch[dst->sa_family].af_netmatch)(&wildcard, &rt->rt_dst)) {
+               rtfree(rt);
+               rt = 0;
+       }
+       if (rt == 0) {
+               rtinit(dst, gateway, RTF_GATEWAY);
+               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) {
+               /*
+                * Smash the current notion of the gateway to
+                * this destination.  This is probably not right,
+                * as it's conceivable a flurry of redirects could
+                * cause the gateway value to fluctuate wildly during
+                * dynamic routing reconfiguration.
+                */
+               rt->rt_gateway = *gateway;
+               rtfree(rt);
+               rtstat.rts_newgateway++;
+               return;
+       }
+}
+
+/*
+ * 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));

 }
 
 }
 

-#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
 /*
  * 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.
+ * interfaces at boot time to make their ``local routes'' known,
+ * for ioctl's, and as the result of routing redirects.

  */
  */

-rtrequest(req, new)
+rtrequest(req, entry)

        int req;
        int req;

-       register struct rtentry *new;
+       register struct rtentry *entry;

 {
 {

-       register struct rtentry *rt;

        register struct mbuf *m, **mprev;
        register struct mbuf *m, **mprev;

-       register int hash, (*match)();
-       register struct sockaddr *sa = &new->rt_dst;
-       register struct sockaddr *gate = &new->rt_gateway;
+       register struct rtentry *rt;

        struct afhash h;
        struct afhash h;

-       struct mbuf **oldmprev;
-       int af = sa->sa_family, doinghost, s, error = 0;
-
-COUNT(RTREQUEST);
-       (*afswitch[af].af_hash)(sa, &h);
-       hash = h.afh_hosthash;
-       mprev = &rthost[hash % RTHASHSIZ];
-       doinghost = 1;
+       int s, error = 0, hash, (*match)();
+       u_int af;
+       struct ifnet *ifp;
+
+       af = entry->rt_dst.sa_family;
+       if (af >= AF_MAX)
+               return (EAFNOSUPPORT);
+       (*afswitch[af].af_hash)(&entry->rt_dst, &h);
+       if (entry->rt_flags & RTF_HOST) {
+               hash = h.afh_hosthash;
+               mprev = &rthost[hash % RTHASHSIZ];
+       } else {
+               hash = h.afh_nethash;
+               mprev = &rtnet[hash % RTHASHSIZ];
+       }
+       match = afswitch[af].af_netmatch;

        s = splimp();
        s = splimp();

-again:

        for (; m = *mprev; mprev = &m->m_next) {
                rt = mtod(m, struct rtentry *);
                if (rt->rt_hash != hash)
                        continue;
        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))
+               if (entry->rt_flags & RTF_HOST) {
+#define        equal(a1, a2) \
+       (bcmp((caddr_t)(a1), (caddr_t)(a2), sizeof (struct sockaddr)) == 0)
+                       if (!equal(&rt->rt_dst, &entry->rt_dst))

                                continue;
                } else {
                                continue;
                } else {

-                       if (rt->rt_dst.sa_family != sa->sa_family ||
-                           (*match)(&rt->rt_dst, sa) == 0)
+                       if (rt->rt_dst.sa_family != entry->rt_dst.sa_family ||
+                           (*match)(&rt->rt_dst, &entry->rt_dst) == 0)

                                continue;
                }
                                continue;
                }

-               /* 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;
-               }
-               break;
-       }
-       if (m == 0 && doinghost) {
-               hash = h.afh_nethash;
-               oldmprev = mprev;
-               mprev = &rtnet[hash % RTHASHSIZ];
-               match = afswitch[af].af_netmatch;
-               doinghost = 0;
-               goto again;
-       }
-
-       if (m == 0 && req != SIOCADDRT) {
-               error = ESRCH;
-               goto bad;
+               if (equal(&rt->rt_gateway, &entry->rt_gateway))
+                       break;

        }
        }

-found:

        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 (m == 0) {
+                       error = ESRCH;
+                       goto bad;
+               }
+               *mprev = m->m_next;
+               if (rt->rt_refcnt > 0) {
+                       rt->rt_flags &= ~RTF_UP;
+                       rttrash++;
+                       m->m_next = 0;
+               } else
+                       (void) m_free(m);

                break;
 
        case SIOCADDRT:
                break;
 
        case SIOCADDRT:

-               m = m_get(M_DONTWAIT);
+               if (m) {
+                       error = EEXIST;
+                       goto bad;
+               }
+               ifp = if_ifwithaddr(&entry->rt_gateway);
+               if (ifp == 0) {
+                       ifp = if_ifwithnet(&entry->rt_gateway);
+                       if (ifp == 0) {
+                               error = ENETUNREACH;
+                               goto bad;
+                       }
+               }
+               m = m_get(M_DONTWAIT, MT_RTABLE);

                if (m == 0) {
                        error = ENOBUFS;
                if (m == 0) {
                        error = ENOBUFS;

-                       break;
+                       goto bad;

                }
                }

+               *mprev = m;

                m->m_off = MMINOFF;
                m->m_len = sizeof (struct rtentry);
                rt = mtod(m, struct rtentry *);
                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;
-               }
-               rt->rt_use = 0;
+               rt->rt_hash = hash;
+               rt->rt_dst = entry->rt_dst;
+               rt->rt_gateway = entry->rt_gateway;
+               rt->rt_flags =
+                   RTF_UP | (entry->rt_flags & (RTF_HOST|RTF_GATEWAY));

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

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

                break;
        }
 bad:
                break;
        }
 bad:


@@ -191,14 +282,17 @@ rtinit(dst, gateway, flags)
        int flags;
 {
        struct rtentry route;
        int flags;
 {
        struct rtentry route;

-       struct route ro;
+       int cmd;

 
 

+       if (flags == -1) {
+               cmd = (int)SIOCDELRT;
+               flags = 0;
+       } else {
+               cmd = (int)SIOCADDRT;
+       }
+       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);

 }
 }