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[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 255ad54..b46049b 100644 (file)
--- a/usr/src/sys/net/route.c
+++ b/usr/src/sys/net/route.c
@@ -1,204 +1,197 @@
-/*     route.c 4.2     82/03/28        */
+/*     route.c 4.12    82/10/09        */
 
 #include "../h/param.h"
 #include "../h/systm.h"
 
 #include "../h/param.h"
 #include "../h/systm.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/proc.h"
-#include "../h/file.h"
-#include "../h/inode.h"
-#include "../h/buf.h"
 #include "../h/mbuf.h"
 #include "../h/protosw.h"
 #include "../h/socket.h"
 #include "../h/mbuf.h"
 #include "../h/protosw.h"
 #include "../h/socket.h"
-#include "../h/socketvar.h"
 #include "../h/ioctl.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 "../net/if.h"
 #include "../net/af.h"
 #include "../net/route.h"
+#include <errno.h>
 
 
+int    rttrash;                /* routes not in table but not freed */
 /*
  * Packet routing routines.
  */
 /*
  * Packet routing routines.
  */
-
-/*
- * With much ado about nothing...
- * route the cars that climb halfway to the stars...
- */
-route(ro)
+rtalloc(ro)
        register struct route *ro;
 {
        register struct rtentry *rt, *rtmin;
        register struct mbuf *m;
        register struct route *ro;
 {
        register struct rtentry *rt, *rtmin;
        register struct mbuf *m;
-       register int key;
+       register int hash, (*match)();
        struct afhash h;
        struct sockaddr *dst = &ro->ro_dst;
        struct afhash h;
        struct sockaddr *dst = &ro->ro_dst;
-       int af = dst->sa_family, doinghost;
+       int af = dst->sa_family;
 
 
-COUNT(ROUTE);
-       if (ro && ro->ro_rt && ro->ro_rt->rt_ifp)       /* ??? */
+       if (ro->ro_rt && ro->ro_rt->rt_ifp)                     /* XXX */
+               return;
+       if (af >= AF_MAX)
                return;
        (*afswitch[af].af_hash)(dst, &h);
                return;
        (*afswitch[af].af_hash)(dst, &h);
-       m = routehash[h.afh_hosthash % RTHASHSIZ];
-       key = h.afh_hostkey;
-       rtmin = 0, doinghost = 1;
-again:
-       for (; m; m = m->m_next) {
+       rtmin = 0, hash = h.afh_hosthash;
+       for (m = rthost[hash % RTHASHSIZ]; m; m = m->m_next) {
                rt = mtod(m, struct rtentry *);
                rt = mtod(m, struct rtentry *);
-#define        equal(a1, a2) \
-       (bcmp((caddr_t)(a1), (caddr_t)(a2), sizeof(struct sockaddr)) == 0)
-               if (rt->rt_key != key)
+               if (rt->rt_hash != hash)
+                       continue;
+               if ((rt->rt_flags & RTF_UP) == 0 ||
+                   (rt->rt_ifp->if_flags & IFF_UP) == 0)
+                       continue;
+               if (bcmp((caddr_t)&rt->rt_dst, (caddr_t)dst, sizeof (*dst)))
                        continue;
                        continue;
-               if (doinghost) {
-                       if (!equal(&rt->rt_dst, dst))
-                               continue;
-               } else {
-                       if (rt->rt_dst.sa_family != af)
-                               continue;
-                       if ((*afswitch[af].af_netmatch)(&rt->rt_dst, dst) == 0)
-                               continue;
-               }
                if (rtmin == 0 || rt->rt_use < rtmin->rt_use)
                        rtmin = rt;
        }
                if (rtmin == 0 || rt->rt_use < rtmin->rt_use)
                        rtmin = rt;
        }
-       if (rtmin) {
-               ro->ro_dst = rt->rt_dst;
-               ro->ro_rt = rt;
-               rt->rt_refcnt++;
-               return;
-       }
-       if (doinghost) {
-               doinghost = 0;
-               m = routehash[h.afh_nethash % RTHASHSIZ];
-               key = h.afh_netkey;
-               goto again;
-       }
-       ro->ro_rt = 0;
-}
-
-struct rtentry *
-reroute(sa)
-       register struct sockaddr *sa;
-{
-       register struct rtentry *rt;
-       register struct mbuf *m;
-       register int key;
-       struct afhash h;
+       if (rtmin) 
+               goto found;
 
 
-COUNT(REROUTE);
-       (*afswitch[sa->sa_family].af_hash)(sa, &h);
-       m = routehash[h.afh_hosthash];
-       key = h.afh_hostkey;
-       for (; m; m = m->m_next) {
+       hash = h.afh_nethash;
+       match = afswitch[af].af_netmatch;
+       for (m = rtnet[hash % RTHASHSIZ]; m; m = m->m_next) {
                rt = mtod(m, struct rtentry *);
                rt = mtod(m, struct rtentry *);
-               if (rt->rt_key != key)
+               if (rt->rt_hash != hash)
                        continue;
                        continue;
-               if (equal(&rt->rt_gateway, sa))
-                       return (rt);
+               if ((rt->rt_flags & RTF_UP) == 0 ||
+                   (rt->rt_ifp->if_flags & IFF_UP) == 0)
+                       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;
        }
        }
-       return (0);
+found:
+       ro->ro_rt = rtmin;
+       if (rtmin)
+               rtmin->rt_refcnt++;
 }
 
 }
 
-/*
- * Routing control calls allow a routing daemon
- * to consistenly access the routing data base for updates.
- */
-rtcontrol(req, addr)
-       caddr_t addr;
+rtfree(rt)
+       register struct rtentry *rt;
 {
 {
-       register struct rtentry rq;
-       int x = splimp(), err = 0;
+       register struct mbuf **mp;
 
 
-COUNT(RTCONTROL);
-       if (suser())
-               goto bad;
-       if (copyin(addr, (caddr_t)&rq, sizeof(struct rtentry))) {
-               u.u_error = EFAULT;
-               goto bad;
+       if (rt == 0)
+               panic("freeroute");
+       rt->rt_refcnt--;
+       if (rt->rt_refcnt == 0 && (rt->rt_flags&RTF_UP) == 0) {
+               rttrash--;
+               (void) m_free(dtom(rt));
        }
        }
-       err = rtrequest(req, &rq);
-bad:
-       splx(x);
-       return (err);
 }
 
 /*
 }
 
 /*
- * Carry out a user request to modify the data base.
+ * 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.
  */
  */
-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 key;
-       struct sockaddr *sa = &new->rt_dst;
+       register struct rtentry *rt;
        struct afhash h;
        struct afhash h;
-       int af = sa->sa_family, doinghost;
+       int af, s, error = 0, hash, (*match)();
+       struct ifnet *ifp;
 
 
-       (*afswitch[af].af_hash)(sa, &h);
-       mprev = &routehash[h.afh_hosthash % RTHASHSIZ];
-       key = h.afh_hostkey;
-       doinghost = 1;
-again:
+       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();
        for (; m = *mprev; mprev = &m->m_next) {
                rt = mtod(m, struct rtentry *);
        for (; m = *mprev; mprev = &m->m_next) {
                rt = mtod(m, struct rtentry *);
-               if (rt->rt_key != key)
+               if (rt->rt_hash != hash)
                        continue;
                        continue;
-               if (doinghost) {
-                       if (!equal(&rt->rt_dst, &new->rt_dst))
+               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 != af)
-                               continue;
-                       if ((*afswitch[af].af_netmatch)(&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;
                }
-               break;
-       }
-       if (m == 0 && doinghost) {
-               doinghost = 0;
-               mprev = &routehash[h.afh_nethash % RTHASHSIZ];
-               key = h.afh_netkey;
-               goto again;
+               if (equal(&rt->rt_gateway, &entry->rt_gateway))
+                       break;
        }
        }
-
-       if (m == 0 && req != SIOCADDRT)
-               return (ESRCH);
        switch (req) {
 
        case SIOCDELRT:
        switch (req) {
 
        case SIOCDELRT:
-               rt->rt_flags &= ~RTF_UP;
-               if (rt->rt_refcnt > 0)  /* should we notify protocols? */
-                       break;
-               *mprev = m_free(m);
-               break;
-
-       case SIOCCHGRT:
-               rt->rt_flags = new->rt_flags;
-               if (rt->rt_refcnt > 0)
-                       return (EBUSY);
-               if (!equal(&rt->rt_gateway, &new->rt_gateway))
-                       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_getclr(M_DONTWAIT);
-               if (m == 0)
-                       return (ENOBUFS);
-               m->m_off = MMINOFF;
+               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);
+               if (m == 0) {
+                       error = ENOBUFS;
+                       goto bad;
+               }
                *mprev = m;
                *mprev = m;
+               m->m_off = MMINOFF;
+               m->m_len = sizeof (struct rtentry);
                rt = mtod(m, struct rtentry *);
                rt = mtod(m, struct rtentry *);
-               *rt = *new;
-               rt->rt_key = h.afh_nethash | h.afh_hosthash;
-newneighbor:
-               rt->rt_ifp = if_ifonnetof(&new->rt_gateway);
-               if (rt->rt_ifp == 0)
-                       rt->rt_flags &= ~RTF_UP;
+               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;
+               rt->rt_use = 0;
+               rt->rt_ifp = ifp;
                break;
        }
                break;
        }
-       return (0);
+bad:
+       splx(s);
+       return (error);
+}
+
+/*
+ * Set up a routing table entry, normally
+ * for an interface.
+ */
+rtinit(dst, gateway, flags)
+       struct sockaddr *dst, *gateway;
+       int flags;
+{
+       struct rtentry route;
+       struct route ro;
+
+       bzero((caddr_t)&route, sizeof (route));
+       route.rt_dst = *dst;
+       route.rt_gateway = *gateway;
+       route.rt_flags = flags;
+       (void) rtrequest(SIOCADDRT, &route);
 }
 }
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.